Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/usb/serial/mos7840.c

  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License as published by
  4  * the Free Software Foundation; either version 2 of the License, or
  5  * (at your option) any later version.
  6  *
  7  * This program is distributed in the hope that it will be useful,
  8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 10  * GNU General Public License for more details.
 11  *
 12  * You should have received a copy of the GNU General Public License
 13  * along with this program; if not, write to the Free Software
 14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 15  *
 16  * Clean ups from Moschip version and a few ioctl implementations by:
 17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
 18  *
 19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
 20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
 21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
 22  *
 23  */
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/errno.h>
 27 #include <linux/slab.h>
 28 #include <linux/tty.h>
 29 #include <linux/tty_driver.h>
 30 #include <linux/tty_flip.h>
 31 #include <linux/module.h>
 32 #include <linux/serial.h>
 33 #include <linux/usb.h>
 34 #include <linux/usb/serial.h>
 35 #include <linux/uaccess.h>
 36 
 37 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
 38 
 39 /*
 40  * 16C50 UART register defines
 41  */
 42 
 43 #define LCR_BITS_5             0x00     /* 5 bits/char */
 44 #define LCR_BITS_6             0x01     /* 6 bits/char */
 45 #define LCR_BITS_7             0x02     /* 7 bits/char */
 46 #define LCR_BITS_8             0x03     /* 8 bits/char */
 47 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
 48 
 49 #define LCR_STOP_1             0x00     /* 1 stop bit */
 50 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
 51 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
 52 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
 53 
 54 #define LCR_PAR_NONE           0x00     /* No parity */
 55 #define LCR_PAR_ODD            0x08     /* Odd parity */
 56 #define LCR_PAR_EVEN           0x18     /* Even parity */
 57 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
 58 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
 59 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
 60 
 61 #define LCR_SET_BREAK          0x40     /* Set Break condition */
 62 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
 63 
 64 #define MCR_DTR                0x01     /* Assert DTR */
 65 #define MCR_RTS                0x02     /* Assert RTS */
 66 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
 67 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
 68 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
 69 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
 70 
 71 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
 72 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
 73 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
 74 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
 75 
 76 /*
 77  * Defines used for sending commands to port
 78  */
 79 
 80 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
 81 
 82 #define MOS_PORT1       0x0200
 83 #define MOS_PORT2       0x0300
 84 #define MOS_VENREG      0x0000
 85 #define MOS_MAX_PORT    0x02
 86 #define MOS_WRITE       0x0E
 87 #define MOS_READ        0x0D
 88 
 89 /* Requests */
 90 #define MCS_RD_RTYPE    0xC0
 91 #define MCS_WR_RTYPE    0x40
 92 #define MCS_RDREQ       0x0D
 93 #define MCS_WRREQ       0x0E
 94 #define MCS_CTRL_TIMEOUT        500
 95 #define VENDOR_READ_LENGTH      (0x01)
 96 
 97 #define MAX_NAME_LEN    64
 98 
 99 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
100 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
101 
102 /* For higher baud Rates use TIOCEXBAUD */
103 #define TIOCEXBAUD     0x5462
104 
105 /* vendor id and device id defines */
106 
107 /* The native mos7840/7820 component */
108 #define USB_VENDOR_ID_MOSCHIP           0x9710
109 #define MOSCHIP_DEVICE_ID_7840          0x7840
110 #define MOSCHIP_DEVICE_ID_7820          0x7820
111 #define MOSCHIP_DEVICE_ID_7810          0x7810
112 /* The native component can have its vendor/device id's overridden
113  * in vendor-specific implementations.  Such devices can be handled
114  * by making a change here, in id_table.
115  */
116 #define USB_VENDOR_ID_BANDB              0x0856
117 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
118 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
119 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
120 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
121 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
122 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
123 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
124 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
125 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
126 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
127 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
128 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
129 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
130 
131 /* This driver also supports
132  * ATEN UC2324 device using Moschip MCS7840
133  * ATEN UC2322 device using Moschip MCS7820
134  */
135 #define USB_VENDOR_ID_ATENINTL          0x0557
136 #define ATENINTL_DEVICE_ID_UC2324       0x2011
137 #define ATENINTL_DEVICE_ID_UC2322       0x7820
138 
139 /* Interrupt Routine Defines    */
140 
141 #define SERIAL_IIR_RLS      0x06
142 #define SERIAL_IIR_MS       0x00
143 
144 /*
145  *  Emulation of the bit mask on the LINE STATUS REGISTER.
146  */
147 #define SERIAL_LSR_DR       0x0001
148 #define SERIAL_LSR_OE       0x0002
149 #define SERIAL_LSR_PE       0x0004
150 #define SERIAL_LSR_FE       0x0008
151 #define SERIAL_LSR_BI       0x0010
152 
153 #define MOS_MSR_DELTA_CTS   0x10
154 #define MOS_MSR_DELTA_DSR   0x20
155 #define MOS_MSR_DELTA_RI    0x40
156 #define MOS_MSR_DELTA_CD    0x80
157 
158 /* Serial Port register Address */
159 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
160 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
161 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
162 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
163 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
164 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
165 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
166 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
167 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
168 
169 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
170 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
171 #define GPIO_REGISTER              ((__u16)(0x07))
172 
173 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
174 
175 /*
176  * URB POOL related defines
177  */
178 #define NUM_URBS                        16      /* URB Count */
179 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
180 
181 /* LED on/off milliseconds*/
182 #define LED_ON_MS       500
183 #define LED_OFF_MS      500
184 
185 enum mos7840_flag {
186         MOS7840_FLAG_CTRL_BUSY,
187         MOS7840_FLAG_LED_BUSY,
188 };
189 
190 static const struct usb_device_id id_table[] = {
191         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
192         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
207         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
208         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
209         {}                      /* terminating entry */
210 };
211 MODULE_DEVICE_TABLE(usb, id_table);
212 
213 /* This structure holds all of the local port information */
214 
215 struct moschip_port {
216         int port_num;           /*Actual port number in the device(1,2,etc) */
217         struct urb *write_urb;  /* write URB for this port */
218         struct urb *read_urb;   /* read URB for this port */
219         __u8 shadowLCR;         /* last LCR value received */
220         __u8 shadowMCR;         /* last MCR value received */
221         char open;
222         char open_ports;
223         struct usb_serial_port *port;   /* loop back to the owner of this object */
224 
225         /* Offsets */
226         __u8 SpRegOffset;
227         __u8 ControlRegOffset;
228         __u8 DcrRegOffset;
229         /* for processing control URBS in interrupt context */
230         struct urb *control_urb;
231         struct usb_ctrlrequest *dr;
232         char *ctrl_buf;
233         int MsrLsr;
234 
235         spinlock_t pool_lock;
236         struct urb *write_urb_pool[NUM_URBS];
237         char busy[NUM_URBS];
238         bool read_urb_busy;
239 
240         /* For device(s) with LED indicator */
241         bool has_led;
242         struct timer_list led_timer1;   /* Timer for LED on */
243         struct timer_list led_timer2;   /* Timer for LED off */
244         struct urb *led_urb;
245         struct usb_ctrlrequest *led_dr;
246 
247         unsigned long flags;
248 };
249 
250 /*
251  * mos7840_set_reg_sync
252  *      To set the Control register by calling usb_fill_control_urb function
253  *      by passing usb_sndctrlpipe function as parameter.
254  */
255 
256 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
257                                 __u16 val)
258 {
259         struct usb_device *dev = port->serial->dev;
260         val = val & 0x00ff;
261         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
262 
263         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
264                                MCS_WR_RTYPE, val, reg, NULL, 0,
265                                MOS_WDR_TIMEOUT);
266 }
267 
268 /*
269  * mos7840_get_reg_sync
270  *      To set the Uart register by calling usb_fill_control_urb function by
271  *      passing usb_rcvctrlpipe function as parameter.
272  */
273 
274 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
275                                 __u16 *val)
276 {
277         struct usb_device *dev = port->serial->dev;
278         int ret = 0;
279         u8 *buf;
280 
281         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
282         if (!buf)
283                 return -ENOMEM;
284 
285         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
286                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
287                               MOS_WDR_TIMEOUT);
288         *val = buf[0];
289         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
290 
291         kfree(buf);
292         return ret;
293 }
294 
295 /*
296  * mos7840_set_uart_reg
297  *      To set the Uart register by calling usb_fill_control_urb function by
298  *      passing usb_sndctrlpipe function as parameter.
299  */
300 
301 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
302                                 __u16 val)
303 {
304 
305         struct usb_device *dev = port->serial->dev;
306         val = val & 0x00ff;
307         /* For the UART control registers, the application number need
308            to be Or'ed */
309         if (port->serial->num_ports == 4) {
310                 val |= ((__u16)port->port_number + 1) << 8;
311         } else {
312                 if (port->port_number == 0) {
313                         val |= ((__u16)port->port_number + 1) << 8;
314                 } else {
315                         val |= ((__u16)port->port_number + 2) << 8;
316                 }
317         }
318         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
319         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
320                                MCS_WR_RTYPE, val, reg, NULL, 0,
321                                MOS_WDR_TIMEOUT);
322 
323 }
324 
325 /*
326  * mos7840_get_uart_reg
327  *      To set the Control register by calling usb_fill_control_urb function
328  *      by passing usb_rcvctrlpipe function as parameter.
329  */
330 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
331                                 __u16 *val)
332 {
333         struct usb_device *dev = port->serial->dev;
334         int ret = 0;
335         __u16 Wval;
336         u8 *buf;
337 
338         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
339         if (!buf)
340                 return -ENOMEM;
341 
342         /* Wval  is same as application number */
343         if (port->serial->num_ports == 4) {
344                 Wval = ((__u16)port->port_number + 1) << 8;
345         } else {
346                 if (port->port_number == 0) {
347                         Wval = ((__u16)port->port_number + 1) << 8;
348                 } else {
349                         Wval = ((__u16)port->port_number + 2) << 8;
350                 }
351         }
352         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
353         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
354                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
355                               MOS_WDR_TIMEOUT);
356         *val = buf[0];
357 
358         kfree(buf);
359         return ret;
360 }
361 
362 static void mos7840_dump_serial_port(struct usb_serial_port *port,
363                                      struct moschip_port *mos7840_port)
364 {
365 
366         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
367         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
368         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
369 
370 }
371 
372 /************************************************************************/
373 /************************************************************************/
374 /*             I N T E R F A C E   F U N C T I O N S                    */
375 /*             I N T E R F A C E   F U N C T I O N S                    */
376 /************************************************************************/
377 /************************************************************************/
378 
379 static inline void mos7840_set_port_private(struct usb_serial_port *port,
380                                             struct moschip_port *data)
381 {
382         usb_set_serial_port_data(port, (void *)data);
383 }
384 
385 static inline struct moschip_port *mos7840_get_port_private(struct
386                                                             usb_serial_port
387                                                             *port)
388 {
389         return (struct moschip_port *)usb_get_serial_port_data(port);
390 }
391 
392 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
393 {
394         struct moschip_port *mos7840_port;
395         struct async_icount *icount;
396         mos7840_port = port;
397         if (new_msr &
398             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
399              MOS_MSR_DELTA_CD)) {
400                 icount = &mos7840_port->port->icount;
401 
402                 /* update input line counters */
403                 if (new_msr & MOS_MSR_DELTA_CTS)
404                         icount->cts++;
405                 if (new_msr & MOS_MSR_DELTA_DSR)
406                         icount->dsr++;
407                 if (new_msr & MOS_MSR_DELTA_CD)
408                         icount->dcd++;
409                 if (new_msr & MOS_MSR_DELTA_RI)
410                         icount->rng++;
411 
412                 wake_up_interruptible(&port->port->port.delta_msr_wait);
413         }
414 }
415 
416 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
417 {
418         struct async_icount *icount;
419 
420         if (new_lsr & SERIAL_LSR_BI) {
421                 /*
422                  * Parity and Framing errors only count if they
423                  * occur exclusive of a break being
424                  * received.
425                  */
426                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
427         }
428 
429         /* update input line counters */
430         icount = &port->port->icount;
431         if (new_lsr & SERIAL_LSR_BI)
432                 icount->brk++;
433         if (new_lsr & SERIAL_LSR_OE)
434                 icount->overrun++;
435         if (new_lsr & SERIAL_LSR_PE)
436                 icount->parity++;
437         if (new_lsr & SERIAL_LSR_FE)
438                 icount->frame++;
439 }
440 
441 /************************************************************************/
442 /************************************************************************/
443 /*            U S B  C A L L B A C K   F U N C T I O N S                */
444 /*            U S B  C A L L B A C K   F U N C T I O N S                */
445 /************************************************************************/
446 /************************************************************************/
447 
448 static void mos7840_control_callback(struct urb *urb)
449 {
450         unsigned char *data;
451         struct moschip_port *mos7840_port;
452         struct device *dev = &urb->dev->dev;
453         __u8 regval = 0x0;
454         int status = urb->status;
455 
456         mos7840_port = urb->context;
457 
458         switch (status) {
459         case 0:
460                 /* success */
461                 break;
462         case -ECONNRESET:
463         case -ENOENT:
464         case -ESHUTDOWN:
465                 /* this urb is terminated, clean up */
466                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
467                 goto out;
468         default:
469                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
470                 goto out;
471         }
472 
473         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
474         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
475                 mos7840_port->MsrLsr, mos7840_port->port_num);
476         data = urb->transfer_buffer;
477         regval = (__u8) data[0];
478         dev_dbg(dev, "%s data is %x\n", __func__, regval);
479         if (mos7840_port->MsrLsr == 0)
480                 mos7840_handle_new_msr(mos7840_port, regval);
481         else if (mos7840_port->MsrLsr == 1)
482                 mos7840_handle_new_lsr(mos7840_port, regval);
483 out:
484         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
485 }
486 
487 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
488                            __u16 *val)
489 {
490         struct usb_device *dev = mcs->port->serial->dev;
491         struct usb_ctrlrequest *dr = mcs->dr;
492         unsigned char *buffer = mcs->ctrl_buf;
493         int ret;
494 
495         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
496                 return -EBUSY;
497 
498         dr->bRequestType = MCS_RD_RTYPE;
499         dr->bRequest = MCS_RDREQ;
500         dr->wValue = cpu_to_le16(Wval); /* 0 */
501         dr->wIndex = cpu_to_le16(reg);
502         dr->wLength = cpu_to_le16(2);
503 
504         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
505                              (unsigned char *)dr, buffer, 2,
506                              mos7840_control_callback, mcs);
507         mcs->control_urb->transfer_buffer_length = 2;
508         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
509         if (ret)
510                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
511 
512         return ret;
513 }
514 
515 static void mos7840_set_led_callback(struct urb *urb)
516 {
517         switch (urb->status) {
518         case 0:
519                 /* Success */
520                 break;
521         case -ECONNRESET:
522         case -ENOENT:
523         case -ESHUTDOWN:
524                 /* This urb is terminated, clean up */
525                 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
526                         __func__, urb->status);
527                 break;
528         default:
529                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
530                         __func__, urb->status);
531         }
532 }
533 
534 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
535                                 __u16 reg)
536 {
537         struct usb_device *dev = mcs->port->serial->dev;
538         struct usb_ctrlrequest *dr = mcs->led_dr;
539 
540         dr->bRequestType = MCS_WR_RTYPE;
541         dr->bRequest = MCS_WRREQ;
542         dr->wValue = cpu_to_le16(wval);
543         dr->wIndex = cpu_to_le16(reg);
544         dr->wLength = cpu_to_le16(0);
545 
546         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
547                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
548 
549         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
550 }
551 
552 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
553                                 __u16 val)
554 {
555         struct usb_device *dev = port->serial->dev;
556 
557         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
558                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
559 }
560 
561 static void mos7840_led_off(unsigned long arg)
562 {
563         struct moschip_port *mcs = (struct moschip_port *) arg;
564 
565         /* Turn off LED */
566         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
567         mod_timer(&mcs->led_timer2,
568                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
569 }
570 
571 static void mos7840_led_flag_off(unsigned long arg)
572 {
573         struct moschip_port *mcs = (struct moschip_port *) arg;
574 
575         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
576 }
577 
578 static void mos7840_led_activity(struct usb_serial_port *port)
579 {
580         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
581 
582         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
583                 return;
584 
585         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
586         mod_timer(&mos7840_port->led_timer1,
587                                 jiffies + msecs_to_jiffies(LED_ON_MS));
588 }
589 
590 /*****************************************************************************
591  * mos7840_interrupt_callback
592  *      this is the callback function for when we have received data on the
593  *      interrupt endpoint.
594  *****************************************************************************/
595 
596 static void mos7840_interrupt_callback(struct urb *urb)
597 {
598         int result;
599         int length;
600         struct moschip_port *mos7840_port;
601         struct usb_serial *serial;
602         __u16 Data;
603         unsigned char *data;
604         __u8 sp[5], st;
605         int i, rv = 0;
606         __u16 wval, wreg = 0;
607         int status = urb->status;
608 
609         switch (status) {
610         case 0:
611                 /* success */
612                 break;
613         case -ECONNRESET:
614         case -ENOENT:
615         case -ESHUTDOWN:
616                 /* this urb is terminated, clean up */
617                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
618                         __func__, status);
619                 return;
620         default:
621                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
622                         __func__, status);
623                 goto exit;
624         }
625 
626         length = urb->actual_length;
627         data = urb->transfer_buffer;
628 
629         serial = urb->context;
630 
631         /* Moschip get 5 bytes
632          * Byte 1 IIR Port 1 (port.number is 0)
633          * Byte 2 IIR Port 2 (port.number is 1)
634          * Byte 3 IIR Port 3 (port.number is 2)
635          * Byte 4 IIR Port 4 (port.number is 3)
636          * Byte 5 FIFO status for both */
637 
638         if (length && length > 5) {
639                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
640                 return;
641         }
642 
643         sp[0] = (__u8) data[0];
644         sp[1] = (__u8) data[1];
645         sp[2] = (__u8) data[2];
646         sp[3] = (__u8) data[3];
647         st = (__u8) data[4];
648 
649         for (i = 0; i < serial->num_ports; i++) {
650                 mos7840_port = mos7840_get_port_private(serial->port[i]);
651                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
652                 if (mos7840_port->open) {
653                         if (sp[i] & 0x01) {
654                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
655                         } else {
656                                 switch (sp[i] & 0x0f) {
657                                 case SERIAL_IIR_RLS:
658                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
659                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
660                                         mos7840_port->MsrLsr = 1;
661                                         wreg = LINE_STATUS_REGISTER;
662                                         break;
663                                 case SERIAL_IIR_MS:
664                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
665                                         mos7840_port->MsrLsr = 0;
666                                         wreg = MODEM_STATUS_REGISTER;
667                                         break;
668                                 }
669                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
670                         }
671                 }
672         }
673         if (!(rv < 0))
674                 /* the completion handler for the control urb will resubmit */
675                 return;
676 exit:
677         result = usb_submit_urb(urb, GFP_ATOMIC);
678         if (result) {
679                 dev_err(&urb->dev->dev,
680                         "%s - Error %d submitting interrupt urb\n",
681                         __func__, result);
682         }
683 }
684 
685 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
686                                        const char *function)
687 {
688         if (!port) {
689                 pr_debug("%s - port == NULL\n", function);
690                 return -1;
691         }
692         if (!port->serial) {
693                 pr_debug("%s - port->serial == NULL\n", function);
694                 return -1;
695         }
696 
697         return 0;
698 }
699 
700 /* Inline functions to check the sanity of a pointer that is passed to us */
701 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
702                                          const char *function)
703 {
704         if (!serial) {
705                 pr_debug("%s - serial == NULL\n", function);
706                 return -1;
707         }
708         if (!serial->type) {
709                 pr_debug("%s - serial->type == NULL!\n", function);
710                 return -1;
711         }
712 
713         return 0;
714 }
715 
716 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
717                                                  const char *function)
718 {
719         /* if no port was specified, or it fails a paranoia check */
720         if (!port ||
721             mos7840_port_paranoia_check(port, function) ||
722             mos7840_serial_paranoia_check(port->serial, function)) {
723                 /* then say that we don't have a valid usb_serial thing,
724                  * which will end up genrating -ENODEV return values */
725                 return NULL;
726         }
727 
728         return port->serial;
729 }
730 
731 /*****************************************************************************
732  * mos7840_bulk_in_callback
733  *      this is the callback function for when we have received data on the
734  *      bulk in endpoint.
735  *****************************************************************************/
736 
737 static void mos7840_bulk_in_callback(struct urb *urb)
738 {
739         int retval;
740         unsigned char *data;
741         struct usb_serial *serial;
742         struct usb_serial_port *port;
743         struct moschip_port *mos7840_port;
744         int status = urb->status;
745 
746         mos7840_port = urb->context;
747         if (!mos7840_port)
748                 return;
749 
750         if (status) {
751                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
752                 mos7840_port->read_urb_busy = false;
753                 return;
754         }
755 
756         port = mos7840_port->port;
757         if (mos7840_port_paranoia_check(port, __func__)) {
758                 mos7840_port->read_urb_busy = false;
759                 return;
760         }
761 
762         serial = mos7840_get_usb_serial(port, __func__);
763         if (!serial) {
764                 mos7840_port->read_urb_busy = false;
765                 return;
766         }
767 
768         data = urb->transfer_buffer;
769         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
770 
771         if (urb->actual_length) {
772                 struct tty_port *tport = &mos7840_port->port->port;
773                 tty_insert_flip_string(tport, data, urb->actual_length);
774                 tty_flip_buffer_push(tport);
775                 port->icount.rx += urb->actual_length;
776                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
777         }
778 
779         if (!mos7840_port->read_urb) {
780                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
781                 mos7840_port->read_urb_busy = false;
782                 return;
783         }
784 
785         if (mos7840_port->has_led)
786                 mos7840_led_activity(port);
787 
788         mos7840_port->read_urb_busy = true;
789         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
790 
791         if (retval) {
792                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
793                 mos7840_port->read_urb_busy = false;
794         }
795 }
796 
797 /*****************************************************************************
798  * mos7840_bulk_out_data_callback
799  *      this is the callback function for when we have finished sending
800  *      serial data on the bulk out endpoint.
801  *****************************************************************************/
802 
803 static void mos7840_bulk_out_data_callback(struct urb *urb)
804 {
805         struct moschip_port *mos7840_port;
806         struct usb_serial_port *port;
807         int status = urb->status;
808         int i;
809 
810         mos7840_port = urb->context;
811         port = mos7840_port->port;
812         spin_lock(&mos7840_port->pool_lock);
813         for (i = 0; i < NUM_URBS; i++) {
814                 if (urb == mos7840_port->write_urb_pool[i]) {
815                         mos7840_port->busy[i] = 0;
816                         break;
817                 }
818         }
819         spin_unlock(&mos7840_port->pool_lock);
820 
821         if (status) {
822                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
823                 return;
824         }
825 
826         if (mos7840_port_paranoia_check(port, __func__))
827                 return;
828 
829         if (mos7840_port->open)
830                 tty_port_tty_wakeup(&port->port);
831 
832 }
833 
834 /************************************************************************/
835 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
836 /************************************************************************/
837 
838 /*****************************************************************************
839  * mos7840_open
840  *      this function is called by the tty driver when a port is opened
841  *      If successful, we return 0
842  *      Otherwise we return a negative error number.
843  *****************************************************************************/
844 
845 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
846 {
847         int response;
848         int j;
849         struct usb_serial *serial;
850         struct urb *urb;
851         __u16 Data;
852         int status;
853         struct moschip_port *mos7840_port;
854         struct moschip_port *port0;
855 
856         if (mos7840_port_paranoia_check(port, __func__))
857                 return -ENODEV;
858 
859         serial = port->serial;
860 
861         if (mos7840_serial_paranoia_check(serial, __func__))
862                 return -ENODEV;
863 
864         mos7840_port = mos7840_get_port_private(port);
865         port0 = mos7840_get_port_private(serial->port[0]);
866 
867         if (mos7840_port == NULL || port0 == NULL)
868                 return -ENODEV;
869 
870         usb_clear_halt(serial->dev, port->write_urb->pipe);
871         usb_clear_halt(serial->dev, port->read_urb->pipe);
872         port0->open_ports++;
873 
874         /* Initialising the write urb pool */
875         for (j = 0; j < NUM_URBS; ++j) {
876                 urb = usb_alloc_urb(0, GFP_KERNEL);
877                 mos7840_port->write_urb_pool[j] = urb;
878                 if (!urb)
879                         continue;
880 
881                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
882                                                                 GFP_KERNEL);
883                 if (!urb->transfer_buffer) {
884                         usb_free_urb(urb);
885                         mos7840_port->write_urb_pool[j] = NULL;
886                         continue;
887                 }
888         }
889 
890 /*****************************************************************************
891  * Initialize MCS7840 -- Write Init values to corresponding Registers
892  *
893  * Register Index
894  * 1 : IER
895  * 2 : FCR
896  * 3 : LCR
897  * 4 : MCR
898  *
899  * 0x08 : SP1/2 Control Reg
900  *****************************************************************************/
901 
902         /* NEED to check the following Block */
903 
904         Data = 0x0;
905         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
906         if (status < 0) {
907                 dev_dbg(&port->dev, "Reading Spreg failed\n");
908                 goto err;
909         }
910         Data |= 0x80;
911         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
912         if (status < 0) {
913                 dev_dbg(&port->dev, "writing Spreg failed\n");
914                 goto err;
915         }
916 
917         Data &= ~0x80;
918         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
919         if (status < 0) {
920                 dev_dbg(&port->dev, "writing Spreg failed\n");
921                 goto err;
922         }
923         /* End of block to be checked */
924 
925         Data = 0x0;
926         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
927                                                                         &Data);
928         if (status < 0) {
929                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
930                 goto err;
931         }
932         Data |= 0x08;           /* Driver done bit */
933         Data |= 0x20;           /* rx_disable */
934         status = mos7840_set_reg_sync(port,
935                                 mos7840_port->ControlRegOffset, Data);
936         if (status < 0) {
937                 dev_dbg(&port->dev, "writing Controlreg failed\n");
938                 goto err;
939         }
940         /* do register settings here */
941         /* Set all regs to the device default values. */
942         /***********************************
943          * First Disable all interrupts.
944          ***********************************/
945         Data = 0x00;
946         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
947         if (status < 0) {
948                 dev_dbg(&port->dev, "disabling interrupts failed\n");
949                 goto err;
950         }
951         /* Set FIFO_CONTROL_REGISTER to the default value */
952         Data = 0x00;
953         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
954         if (status < 0) {
955                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
956                 goto err;
957         }
958 
959         Data = 0xcf;
960         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
961         if (status < 0) {
962                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
963                 goto err;
964         }
965 
966         Data = 0x03;
967         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
968         mos7840_port->shadowLCR = Data;
969 
970         Data = 0x0b;
971         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
972         mos7840_port->shadowMCR = Data;
973 
974         Data = 0x00;
975         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
976         mos7840_port->shadowLCR = Data;
977 
978         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
979         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
980 
981         Data = 0x0c;
982         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
983 
984         Data = 0x0;
985         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
986 
987         Data = 0x00;
988         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
989 
990         Data = Data & ~SERIAL_LCR_DLAB;
991         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
992         mos7840_port->shadowLCR = Data;
993 
994         /* clearing Bulkin and Bulkout Fifo */
995         Data = 0x0;
996         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
997 
998         Data = Data | 0x0c;
999         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1000 
1001         Data = Data & ~0x0c;
1002         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1003         /* Finally enable all interrupts */
1004         Data = 0x0c;
1005         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1006 
1007         /* clearing rx_disable */
1008         Data = 0x0;
1009         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010                                                                         &Data);
1011         Data = Data & ~0x20;
1012         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013                                                                         Data);
1014 
1015         /* rx_negate */
1016         Data = 0x0;
1017         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1018                                                                         &Data);
1019         Data = Data | 0x10;
1020         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1021                                                                         Data);
1022 
1023         /* Check to see if we've set up our endpoint info yet    *
1024          * (can't set it up in mos7840_startup as the structures *
1025          * were not set up at that time.)                        */
1026         if (port0->open_ports == 1) {
1027                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1028                         /* set up interrupt urb */
1029                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1030                                 serial->dev,
1031                                 usb_rcvintpipe(serial->dev,
1032                                 serial->port[0]->interrupt_in_endpointAddress),
1033                                 serial->port[0]->interrupt_in_buffer,
1034                                 serial->port[0]->interrupt_in_urb->
1035                                 transfer_buffer_length,
1036                                 mos7840_interrupt_callback,
1037                                 serial,
1038                                 serial->port[0]->interrupt_in_urb->interval);
1039 
1040                         /* start interrupt read for mos7840               *
1041                          * will continue as long as mos7840 is connected  */
1042 
1043                         response =
1044                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1045                                            GFP_KERNEL);
1046                         if (response) {
1047                                 dev_err(&port->dev, "%s - Error %d submitting "
1048                                         "interrupt urb\n", __func__, response);
1049                         }
1050 
1051                 }
1052 
1053         }
1054 
1055         /* see if we've set up our endpoint info yet   *
1056          * (can't set it up in mos7840_startup as the  *
1057          * structures were not set up at that time.)   */
1058 
1059         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1060         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1061         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1062         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1063         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1064         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1065         mos7840_port->read_urb = port->read_urb;
1066 
1067         /* set up our bulk in urb */
1068         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1069                 usb_fill_bulk_urb(mos7840_port->read_urb,
1070                         serial->dev,
1071                         usb_rcvbulkpipe(serial->dev,
1072                                 (port->bulk_in_endpointAddress) + 2),
1073                         port->bulk_in_buffer,
1074                         mos7840_port->read_urb->transfer_buffer_length,
1075                         mos7840_bulk_in_callback, mos7840_port);
1076         } else {
1077                 usb_fill_bulk_urb(mos7840_port->read_urb,
1078                         serial->dev,
1079                         usb_rcvbulkpipe(serial->dev,
1080                                 port->bulk_in_endpointAddress),
1081                         port->bulk_in_buffer,
1082                         mos7840_port->read_urb->transfer_buffer_length,
1083                         mos7840_bulk_in_callback, mos7840_port);
1084         }
1085 
1086         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1087         mos7840_port->read_urb_busy = true;
1088         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1089         if (response) {
1090                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1091                         __func__, response);
1092                 mos7840_port->read_urb_busy = false;
1093         }
1094 
1095         /* initialize our port settings */
1096         /* Must set to enable ints! */
1097         mos7840_port->shadowMCR = MCR_MASTER_IE;
1098         /* send a open port command */
1099         mos7840_port->open = 1;
1100         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1101 
1102         return 0;
1103 err:
1104         for (j = 0; j < NUM_URBS; ++j) {
1105                 urb = mos7840_port->write_urb_pool[j];
1106                 if (!urb)
1107                         continue;
1108                 kfree(urb->transfer_buffer);
1109                 usb_free_urb(urb);
1110         }
1111         return status;
1112 }
1113 
1114 /*****************************************************************************
1115  * mos7840_chars_in_buffer
1116  *      this function is called by the tty driver when it wants to know how many
1117  *      bytes of data we currently have outstanding in the port (data that has
1118  *      been written, but hasn't made it out the port yet)
1119  *      If successful, we return the number of bytes left to be written in the
1120  *      system,
1121  *      Otherwise we return zero.
1122  *****************************************************************************/
1123 
1124 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1125 {
1126         struct usb_serial_port *port = tty->driver_data;
1127         int i;
1128         int chars = 0;
1129         unsigned long flags;
1130         struct moschip_port *mos7840_port;
1131 
1132         if (mos7840_port_paranoia_check(port, __func__))
1133                 return 0;
1134 
1135         mos7840_port = mos7840_get_port_private(port);
1136         if (mos7840_port == NULL)
1137                 return 0;
1138 
1139         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1140         for (i = 0; i < NUM_URBS; ++i) {
1141                 if (mos7840_port->busy[i]) {
1142                         struct urb *urb = mos7840_port->write_urb_pool[i];
1143                         chars += urb->transfer_buffer_length;
1144                 }
1145         }
1146         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1147         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1148         return chars;
1149 
1150 }
1151 
1152 /*****************************************************************************
1153  * mos7840_close
1154  *      this function is called by the tty driver when a port is closed
1155  *****************************************************************************/
1156 
1157 static void mos7840_close(struct usb_serial_port *port)
1158 {
1159         struct usb_serial *serial;
1160         struct moschip_port *mos7840_port;
1161         struct moschip_port *port0;
1162         int j;
1163         __u16 Data;
1164 
1165         if (mos7840_port_paranoia_check(port, __func__))
1166                 return;
1167 
1168         serial = mos7840_get_usb_serial(port, __func__);
1169         if (!serial)
1170                 return;
1171 
1172         mos7840_port = mos7840_get_port_private(port);
1173         port0 = mos7840_get_port_private(serial->port[0]);
1174 
1175         if (mos7840_port == NULL || port0 == NULL)
1176                 return;
1177 
1178         for (j = 0; j < NUM_URBS; ++j)
1179                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1180 
1181         /* Freeing Write URBs */
1182         for (j = 0; j < NUM_URBS; ++j) {
1183                 if (mos7840_port->write_urb_pool[j]) {
1184                         kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1185                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1186                 }
1187         }
1188 
1189         usb_kill_urb(mos7840_port->write_urb);
1190         usb_kill_urb(mos7840_port->read_urb);
1191         mos7840_port->read_urb_busy = false;
1192 
1193         port0->open_ports--;
1194         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1195         if (port0->open_ports == 0) {
1196                 if (serial->port[0]->interrupt_in_urb) {
1197                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1198                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1199                 }
1200         }
1201 
1202         if (mos7840_port->write_urb) {
1203                 /* if this urb had a transfer buffer already (old tx) free it */
1204                 kfree(mos7840_port->write_urb->transfer_buffer);
1205                 usb_free_urb(mos7840_port->write_urb);
1206         }
1207 
1208         Data = 0x0;
1209         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1210 
1211         Data = 0x00;
1212         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1213 
1214         mos7840_port->open = 0;
1215 }
1216 
1217 /*****************************************************************************
1218  * mos7840_break
1219  *      this function sends a break to the port
1220  *****************************************************************************/
1221 static void mos7840_break(struct tty_struct *tty, int break_state)
1222 {
1223         struct usb_serial_port *port = tty->driver_data;
1224         unsigned char data;
1225         struct usb_serial *serial;
1226         struct moschip_port *mos7840_port;
1227 
1228         if (mos7840_port_paranoia_check(port, __func__))
1229                 return;
1230 
1231         serial = mos7840_get_usb_serial(port, __func__);
1232         if (!serial)
1233                 return;
1234 
1235         mos7840_port = mos7840_get_port_private(port);
1236 
1237         if (mos7840_port == NULL)
1238                 return;
1239 
1240         if (break_state == -1)
1241                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1242         else
1243                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1244 
1245         /* FIXME: no locking on shadowLCR anywhere in driver */
1246         mos7840_port->shadowLCR = data;
1247         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1248         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1249                              mos7840_port->shadowLCR);
1250 }
1251 
1252 /*****************************************************************************
1253  * mos7840_write_room
1254  *      this function is called by the tty driver when it wants to know how many
1255  *      bytes of data we can accept for a specific port.
1256  *      If successful, we return the amount of room that we have for this port
1257  *      Otherwise we return a negative error number.
1258  *****************************************************************************/
1259 
1260 static int mos7840_write_room(struct tty_struct *tty)
1261 {
1262         struct usb_serial_port *port = tty->driver_data;
1263         int i;
1264         int room = 0;
1265         unsigned long flags;
1266         struct moschip_port *mos7840_port;
1267 
1268         if (mos7840_port_paranoia_check(port, __func__))
1269                 return -1;
1270 
1271         mos7840_port = mos7840_get_port_private(port);
1272         if (mos7840_port == NULL)
1273                 return -1;
1274 
1275         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1276         for (i = 0; i < NUM_URBS; ++i) {
1277                 if (!mos7840_port->busy[i])
1278                         room += URB_TRANSFER_BUFFER_SIZE;
1279         }
1280         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1281 
1282         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1283         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1284         return room;
1285 
1286 }
1287 
1288 /*****************************************************************************
1289  * mos7840_write
1290  *      this function is called by the tty driver when data should be written to
1291  *      the port.
1292  *      If successful, we return the number of bytes written, otherwise we
1293  *      return a negative error number.
1294  *****************************************************************************/
1295 
1296 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1297                          const unsigned char *data, int count)
1298 {
1299         int status;
1300         int i;
1301         int bytes_sent = 0;
1302         int transfer_size;
1303         unsigned long flags;
1304 
1305         struct moschip_port *mos7840_port;
1306         struct usb_serial *serial;
1307         struct urb *urb;
1308         /* __u16 Data; */
1309         const unsigned char *current_position = data;
1310         unsigned char *data1;
1311 
1312 #ifdef NOTMOS7840
1313         Data = 0x00;
1314         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1315         mos7840_port->shadowLCR = Data;
1316         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1317         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1318 
1319         /* Data = 0x03; */
1320         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1321         /* mos7840_port->shadowLCR=Data;//Need to add later */
1322 
1323         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1324         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1325 
1326         /* Data = 0x0c; */
1327         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1328         Data = 0x00;
1329         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1330         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1331 
1332         Data = 0x0;
1333         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1334         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1335 
1336         Data = Data & ~SERIAL_LCR_DLAB;
1337         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1338         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1339 #endif
1340 
1341         if (mos7840_port_paranoia_check(port, __func__))
1342                 return -1;
1343 
1344         serial = port->serial;
1345         if (mos7840_serial_paranoia_check(serial, __func__))
1346                 return -1;
1347 
1348         mos7840_port = mos7840_get_port_private(port);
1349         if (mos7840_port == NULL)
1350                 return -1;
1351 
1352         /* try to find a free urb in the list */
1353         urb = NULL;
1354 
1355         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1356         for (i = 0; i < NUM_URBS; ++i) {
1357                 if (!mos7840_port->busy[i]) {
1358                         mos7840_port->busy[i] = 1;
1359                         urb = mos7840_port->write_urb_pool[i];
1360                         dev_dbg(&port->dev, "URB:%d\n", i);
1361                         break;
1362                 }
1363         }
1364         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1365 
1366         if (urb == NULL) {
1367                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1368                 goto exit;
1369         }
1370 
1371         if (urb->transfer_buffer == NULL) {
1372                 urb->transfer_buffer =
1373                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1374                 if (!urb->transfer_buffer)
1375                         goto exit;
1376         }
1377         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1378 
1379         memcpy(urb->transfer_buffer, current_position, transfer_size);
1380 
1381         /* fill urb with data and submit  */
1382         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1383                 usb_fill_bulk_urb(urb,
1384                         serial->dev,
1385                         usb_sndbulkpipe(serial->dev,
1386                                 (port->bulk_out_endpointAddress) + 2),
1387                         urb->transfer_buffer,
1388                         transfer_size,
1389                         mos7840_bulk_out_data_callback, mos7840_port);
1390         } else {
1391                 usb_fill_bulk_urb(urb,
1392                         serial->dev,
1393                         usb_sndbulkpipe(serial->dev,
1394                                 port->bulk_out_endpointAddress),
1395                         urb->transfer_buffer,
1396                         transfer_size,
1397                         mos7840_bulk_out_data_callback, mos7840_port);
1398         }
1399 
1400         data1 = urb->transfer_buffer;
1401         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1402 
1403         if (mos7840_port->has_led)
1404                 mos7840_led_activity(port);
1405 
1406         /* send it down the pipe */
1407         status = usb_submit_urb(urb, GFP_ATOMIC);
1408 
1409         if (status) {
1410                 mos7840_port->busy[i] = 0;
1411                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1412                         "with status = %d\n", __func__, status);
1413                 bytes_sent = status;
1414                 goto exit;
1415         }
1416         bytes_sent = transfer_size;
1417         port->icount.tx += transfer_size;
1418         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1419 exit:
1420         return bytes_sent;
1421 
1422 }
1423 
1424 /*****************************************************************************
1425  * mos7840_throttle
1426  *      this function is called by the tty driver when it wants to stop the data
1427  *      being read from the port.
1428  *****************************************************************************/
1429 
1430 static void mos7840_throttle(struct tty_struct *tty)
1431 {
1432         struct usb_serial_port *port = tty->driver_data;
1433         struct moschip_port *mos7840_port;
1434         int status;
1435 
1436         if (mos7840_port_paranoia_check(port, __func__))
1437                 return;
1438 
1439         mos7840_port = mos7840_get_port_private(port);
1440 
1441         if (mos7840_port == NULL)
1442                 return;
1443 
1444         if (!mos7840_port->open) {
1445                 dev_dbg(&port->dev, "%s", "port not opened\n");
1446                 return;
1447         }
1448 
1449         /* if we are implementing XON/XOFF, send the stop character */
1450         if (I_IXOFF(tty)) {
1451                 unsigned char stop_char = STOP_CHAR(tty);
1452                 status = mos7840_write(tty, port, &stop_char, 1);
1453                 if (status <= 0)
1454                         return;
1455         }
1456         /* if we are implementing RTS/CTS, toggle that line */
1457         if (tty->termios.c_cflag & CRTSCTS) {
1458                 mos7840_port->shadowMCR &= ~MCR_RTS;
1459                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1460                                          mos7840_port->shadowMCR);
1461                 if (status < 0)
1462                         return;
1463         }
1464 }
1465 
1466 /*****************************************************************************
1467  * mos7840_unthrottle
1468  *      this function is called by the tty driver when it wants to resume
1469  *      the data being read from the port (called after mos7840_throttle is
1470  *      called)
1471  *****************************************************************************/
1472 static void mos7840_unthrottle(struct tty_struct *tty)
1473 {
1474         struct usb_serial_port *port = tty->driver_data;
1475         int status;
1476         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1477 
1478         if (mos7840_port_paranoia_check(port, __func__))
1479                 return;
1480 
1481         if (mos7840_port == NULL)
1482                 return;
1483 
1484         if (!mos7840_port->open) {
1485                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1486                 return;
1487         }
1488 
1489         /* if we are implementing XON/XOFF, send the start character */
1490         if (I_IXOFF(tty)) {
1491                 unsigned char start_char = START_CHAR(tty);
1492                 status = mos7840_write(tty, port, &start_char, 1);
1493                 if (status <= 0)
1494                         return;
1495         }
1496 
1497         /* if we are implementing RTS/CTS, toggle that line */
1498         if (tty->termios.c_cflag & CRTSCTS) {
1499                 mos7840_port->shadowMCR |= MCR_RTS;
1500                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1501                                          mos7840_port->shadowMCR);
1502                 if (status < 0)
1503                         return;
1504         }
1505 }
1506 
1507 static int mos7840_tiocmget(struct tty_struct *tty)
1508 {
1509         struct usb_serial_port *port = tty->driver_data;
1510         struct moschip_port *mos7840_port;
1511         unsigned int result;
1512         __u16 msr;
1513         __u16 mcr;
1514         int status;
1515         mos7840_port = mos7840_get_port_private(port);
1516 
1517         if (mos7840_port == NULL)
1518                 return -ENODEV;
1519 
1520         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1521         if (status != 1)
1522                 return -EIO;
1523         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1524         if (status != 1)
1525                 return -EIO;
1526         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1527             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1528             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1529             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1530             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1531             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1532             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1533 
1534         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1535 
1536         return result;
1537 }
1538 
1539 static int mos7840_tiocmset(struct tty_struct *tty,
1540                             unsigned int set, unsigned int clear)
1541 {
1542         struct usb_serial_port *port = tty->driver_data;
1543         struct moschip_port *mos7840_port;
1544         unsigned int mcr;
1545         int status;
1546 
1547         mos7840_port = mos7840_get_port_private(port);
1548 
1549         if (mos7840_port == NULL)
1550                 return -ENODEV;
1551 
1552         /* FIXME: What locks the port registers ? */
1553         mcr = mos7840_port->shadowMCR;
1554         if (clear & TIOCM_RTS)
1555                 mcr &= ~MCR_RTS;
1556         if (clear & TIOCM_DTR)
1557                 mcr &= ~MCR_DTR;
1558         if (clear & TIOCM_LOOP)
1559                 mcr &= ~MCR_LOOPBACK;
1560 
1561         if (set & TIOCM_RTS)
1562                 mcr |= MCR_RTS;
1563         if (set & TIOCM_DTR)
1564                 mcr |= MCR_DTR;
1565         if (set & TIOCM_LOOP)
1566                 mcr |= MCR_LOOPBACK;
1567 
1568         mos7840_port->shadowMCR = mcr;
1569 
1570         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1571         if (status < 0) {
1572                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1573                 return status;
1574         }
1575 
1576         return 0;
1577 }
1578 
1579 /*****************************************************************************
1580  * mos7840_calc_baud_rate_divisor
1581  *      this function calculates the proper baud rate divisor for the specified
1582  *      baud rate.
1583  *****************************************************************************/
1584 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1585                                           int baudRate, int *divisor,
1586                                           __u16 *clk_sel_val)
1587 {
1588         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1589 
1590         if (baudRate <= 115200) {
1591                 *divisor = 115200 / baudRate;
1592                 *clk_sel_val = 0x0;
1593         }
1594         if ((baudRate > 115200) && (baudRate <= 230400)) {
1595                 *divisor = 230400 / baudRate;
1596                 *clk_sel_val = 0x10;
1597         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1598                 *divisor = 403200 / baudRate;
1599                 *clk_sel_val = 0x20;
1600         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1601                 *divisor = 460800 / baudRate;
1602                 *clk_sel_val = 0x30;
1603         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1604                 *divisor = 806400 / baudRate;
1605                 *clk_sel_val = 0x40;
1606         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1607                 *divisor = 921600 / baudRate;
1608                 *clk_sel_val = 0x50;
1609         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1610                 *divisor = 1572864 / baudRate;
1611                 *clk_sel_val = 0x60;
1612         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1613                 *divisor = 3145728 / baudRate;
1614                 *clk_sel_val = 0x70;
1615         }
1616         return 0;
1617 
1618 #ifdef NOTMCS7840
1619 
1620         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1621                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1622                         *divisor = mos7840_divisor_table[i].Divisor;
1623                         return 0;
1624                 }
1625         }
1626 
1627         /* After trying for all the standard baud rates    *
1628          * Try calculating the divisor for this baud rate  */
1629 
1630         if (baudrate > 75 && baudrate < 230400) {
1631                 /* get the divisor */
1632                 custom = (__u16) (230400L / baudrate);
1633 
1634                 /* Check for round off */
1635                 round1 = (__u16) (2304000L / baudrate);
1636                 round = (__u16) (round1 - (custom * 10));
1637                 if (round > 4)
1638                         custom++;
1639                 *divisor = custom;
1640 
1641                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1642                 return 0;
1643         }
1644 
1645         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1646         return -1;
1647 #endif
1648 }
1649 
1650 /*****************************************************************************
1651  * mos7840_send_cmd_write_baud_rate
1652  *      this function sends the proper command to change the baud rate of the
1653  *      specified port.
1654  *****************************************************************************/
1655 
1656 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1657                                             int baudRate)
1658 {
1659         int divisor = 0;
1660         int status;
1661         __u16 Data;
1662         unsigned char number;
1663         __u16 clk_sel_val;
1664         struct usb_serial_port *port;
1665 
1666         if (mos7840_port == NULL)
1667                 return -1;
1668 
1669         port = mos7840_port->port;
1670         if (mos7840_port_paranoia_check(port, __func__))
1671                 return -1;
1672 
1673         if (mos7840_serial_paranoia_check(port->serial, __func__))
1674                 return -1;
1675 
1676         number = mos7840_port->port->port_number;
1677 
1678         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1679         /* reset clk_uart_sel in spregOffset */
1680         if (baudRate > 115200) {
1681 #ifdef HW_flow_control
1682                 /* NOTE: need to see the pther register to modify */
1683                 /* setting h/w flow control bit to 1 */
1684                 Data = 0x2b;
1685                 mos7840_port->shadowMCR = Data;
1686                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1687                                                                         Data);
1688                 if (status < 0) {
1689                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1690                         return -1;
1691                 }
1692 #endif
1693 
1694         } else {
1695 #ifdef HW_flow_control
1696                 /* setting h/w flow control bit to 0 */
1697                 Data = 0xb;
1698                 mos7840_port->shadowMCR = Data;
1699                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1700                                                                         Data);
1701                 if (status < 0) {
1702                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1703                         return -1;
1704                 }
1705 #endif
1706 
1707         }
1708 
1709         if (1) {                /* baudRate <= 115200) */
1710                 clk_sel_val = 0x0;
1711                 Data = 0x0;
1712                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1713                                                    &clk_sel_val);
1714                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1715                                                                  &Data);
1716                 if (status < 0) {
1717                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1718                         return -1;
1719                 }
1720                 Data = (Data & 0x8f) | clk_sel_val;
1721                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1722                                                                 Data);
1723                 if (status < 0) {
1724                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1725                         return -1;
1726                 }
1727                 /* Calculate the Divisor */
1728 
1729                 if (status) {
1730                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1731                         return status;
1732                 }
1733                 /* Enable access to divisor latch */
1734                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1735                 mos7840_port->shadowLCR = Data;
1736                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1737 
1738                 /* Write the divisor */
1739                 Data = (unsigned char)(divisor & 0xff);
1740                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1741                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1742 
1743                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1744                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1745                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1746 
1747                 /* Disable access to divisor latch */
1748                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1749                 mos7840_port->shadowLCR = Data;
1750                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1751 
1752         }
1753         return status;
1754 }
1755 
1756 /*****************************************************************************
1757  * mos7840_change_port_settings
1758  *      This routine is called to set the UART on the device to match
1759  *      the specified new settings.
1760  *****************************************************************************/
1761 
1762 static void mos7840_change_port_settings(struct tty_struct *tty,
1763         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1764 {
1765         int baud;
1766         unsigned cflag;
1767         unsigned iflag;
1768         __u8 lData;
1769         __u8 lParity;
1770         __u8 lStop;
1771         int status;
1772         __u16 Data;
1773         struct usb_serial_port *port;
1774         struct usb_serial *serial;
1775 
1776         if (mos7840_port == NULL)
1777                 return;
1778 
1779         port = mos7840_port->port;
1780 
1781         if (mos7840_port_paranoia_check(port, __func__))
1782                 return;
1783 
1784         if (mos7840_serial_paranoia_check(port->serial, __func__))
1785                 return;
1786 
1787         serial = port->serial;
1788 
1789         if (!mos7840_port->open) {
1790                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1791                 return;
1792         }
1793 
1794         lData = LCR_BITS_8;
1795         lStop = LCR_STOP_1;
1796         lParity = LCR_PAR_NONE;
1797 
1798         cflag = tty->termios.c_cflag;
1799         iflag = tty->termios.c_iflag;
1800 
1801         /* Change the number of bits */
1802         switch (cflag & CSIZE) {
1803         case CS5:
1804                 lData = LCR_BITS_5;
1805                 break;
1806 
1807         case CS6:
1808                 lData = LCR_BITS_6;
1809                 break;
1810 
1811         case CS7:
1812                 lData = LCR_BITS_7;
1813                 break;
1814 
1815         default:
1816         case CS8:
1817                 lData = LCR_BITS_8;
1818                 break;
1819         }
1820 
1821         /* Change the Parity bit */
1822         if (cflag & PARENB) {
1823                 if (cflag & PARODD) {
1824                         lParity = LCR_PAR_ODD;
1825                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1826                 } else {
1827                         lParity = LCR_PAR_EVEN;
1828                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1829                 }
1830 
1831         } else {
1832                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1833         }
1834 
1835         if (cflag & CMSPAR)
1836                 lParity = lParity | 0x20;
1837 
1838         /* Change the Stop bit */
1839         if (cflag & CSTOPB) {
1840                 lStop = LCR_STOP_2;
1841                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1842         } else {
1843                 lStop = LCR_STOP_1;
1844                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1845         }
1846 
1847         /* Update the LCR with the correct value */
1848         mos7840_port->shadowLCR &=
1849             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1850         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1851 
1852         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1853                 mos7840_port->shadowLCR);
1854         /* Disable Interrupts */
1855         Data = 0x00;
1856         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1857 
1858         Data = 0x00;
1859         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1860 
1861         Data = 0xcf;
1862         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1863 
1864         /* Send the updated LCR value to the mos7840 */
1865         Data = mos7840_port->shadowLCR;
1866 
1867         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1868 
1869         Data = 0x00b;
1870         mos7840_port->shadowMCR = Data;
1871         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1872         Data = 0x00b;
1873         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1874 
1875         /* set up the MCR register and send it to the mos7840 */
1876 
1877         mos7840_port->shadowMCR = MCR_MASTER_IE;
1878         if (cflag & CBAUD)
1879                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1880 
1881         if (cflag & CRTSCTS)
1882                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1883         else
1884                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1885 
1886         Data = mos7840_port->shadowMCR;
1887         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1888 
1889         /* Determine divisor based on baud rate */
1890         baud = tty_get_baud_rate(tty);
1891 
1892         if (!baud) {
1893                 /* pick a default, any default... */
1894                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1895                 baud = 9600;
1896         }
1897 
1898         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1899         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1900 
1901         /* Enable Interrupts */
1902         Data = 0x0c;
1903         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1904 
1905         if (mos7840_port->read_urb_busy == false) {
1906                 mos7840_port->read_urb_busy = true;
1907                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1908                 if (status) {
1909                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1910                             status);
1911                         mos7840_port->read_urb_busy = false;
1912                 }
1913         }
1914         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1915                 mos7840_port->shadowLCR);
1916 }
1917 
1918 /*****************************************************************************
1919  * mos7840_set_termios
1920  *      this function is called by the tty driver when it wants to change
1921  *      the termios structure
1922  *****************************************************************************/
1923 
1924 static void mos7840_set_termios(struct tty_struct *tty,
1925                                 struct usb_serial_port *port,
1926                                 struct ktermios *old_termios)
1927 {
1928         int status;
1929         unsigned int cflag;
1930         struct usb_serial *serial;
1931         struct moschip_port *mos7840_port;
1932 
1933         if (mos7840_port_paranoia_check(port, __func__))
1934                 return;
1935 
1936         serial = port->serial;
1937 
1938         if (mos7840_serial_paranoia_check(serial, __func__))
1939                 return;
1940 
1941         mos7840_port = mos7840_get_port_private(port);
1942 
1943         if (mos7840_port == NULL)
1944                 return;
1945 
1946         if (!mos7840_port->open) {
1947                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1948                 return;
1949         }
1950 
1951         dev_dbg(&port->dev, "%s", "setting termios - \n");
1952 
1953         cflag = tty->termios.c_cflag;
1954 
1955         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1956                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1957         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1958                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1959 
1960         /* change the port settings to the new ones specified */
1961 
1962         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1963 
1964         if (!mos7840_port->read_urb) {
1965                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1966                 return;
1967         }
1968 
1969         if (mos7840_port->read_urb_busy == false) {
1970                 mos7840_port->read_urb_busy = true;
1971                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1972                 if (status) {
1973                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1974                             status);
1975                         mos7840_port->read_urb_busy = false;
1976                 }
1977         }
1978 }
1979 
1980 /*****************************************************************************
1981  * mos7840_get_lsr_info - get line status register info
1982  *
1983  * Purpose: Let user call ioctl() to get info when the UART physically
1984  *          is emptied.  On bus types like RS485, the transmitter must
1985  *          release the bus after transmitting. This must be done when
1986  *          the transmit shift register is empty, not be done when the
1987  *          transmit holding register is empty.  This functionality
1988  *          allows an RS485 driver to be written in user space.
1989  *****************************************************************************/
1990 
1991 static int mos7840_get_lsr_info(struct tty_struct *tty,
1992                                 unsigned int __user *value)
1993 {
1994         int count;
1995         unsigned int result = 0;
1996 
1997         count = mos7840_chars_in_buffer(tty);
1998         if (count == 0)
1999                 result = TIOCSER_TEMT;
2000 
2001         if (copy_to_user(value, &result, sizeof(int)))
2002                 return -EFAULT;
2003         return 0;
2004 }
2005 
2006 /*****************************************************************************
2007  * mos7840_get_serial_info
2008  *      function to get information about serial port
2009  *****************************************************************************/
2010 
2011 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2012                                    struct serial_struct __user *retinfo)
2013 {
2014         struct serial_struct tmp;
2015 
2016         if (mos7840_port == NULL)
2017                 return -1;
2018 
2019         if (!retinfo)
2020                 return -EFAULT;
2021 
2022         memset(&tmp, 0, sizeof(tmp));
2023 
2024         tmp.type = PORT_16550A;
2025         tmp.line = mos7840_port->port->minor;
2026         tmp.port = mos7840_port->port->port_number;
2027         tmp.irq = 0;
2028         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2029         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2030         tmp.baud_base = 9600;
2031         tmp.close_delay = 5 * HZ;
2032         tmp.closing_wait = 30 * HZ;
2033 
2034         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2035                 return -EFAULT;
2036         return 0;
2037 }
2038 
2039 /*****************************************************************************
2040  * SerialIoctl
2041  *      this function handles any ioctl calls to the driver
2042  *****************************************************************************/
2043 
2044 static int mos7840_ioctl(struct tty_struct *tty,
2045                          unsigned int cmd, unsigned long arg)
2046 {
2047         struct usb_serial_port *port = tty->driver_data;
2048         void __user *argp = (void __user *)arg;
2049         struct moschip_port *mos7840_port;
2050 
2051         if (mos7840_port_paranoia_check(port, __func__))
2052                 return -1;
2053 
2054         mos7840_port = mos7840_get_port_private(port);
2055 
2056         if (mos7840_port == NULL)
2057                 return -1;
2058 
2059         switch (cmd) {
2060                 /* return number of bytes available */
2061 
2062         case TIOCSERGETLSR:
2063                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2064                 return mos7840_get_lsr_info(tty, argp);
2065 
2066         case TIOCGSERIAL:
2067                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2068                 return mos7840_get_serial_info(mos7840_port, argp);
2069 
2070         case TIOCSSERIAL:
2071                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2072                 break;
2073         default:
2074                 break;
2075         }
2076         return -ENOIOCTLCMD;
2077 }
2078 
2079 static int mos7810_check(struct usb_serial *serial)
2080 {
2081         int i, pass_count = 0;
2082         u8 *buf;
2083         __u16 data = 0, mcr_data = 0;
2084         __u16 test_pattern = 0x55AA;
2085         int res;
2086 
2087         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2088         if (!buf)
2089                 return 0;       /* failed to identify 7810 */
2090 
2091         /* Store MCR setting */
2092         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2093                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2094                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2095         if (res == VENDOR_READ_LENGTH)
2096                 mcr_data = *buf;
2097 
2098         for (i = 0; i < 16; i++) {
2099                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2100                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2101                         MCS_WRREQ, MCS_WR_RTYPE,
2102                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2103                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2104 
2105                 /* Read the test pattern back */
2106                 res = usb_control_msg(serial->dev,
2107                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2108                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2109                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2110                 if (res == VENDOR_READ_LENGTH)
2111                         data = *buf;
2112 
2113                 /* If this is a MCS7810 device, both test patterns must match */
2114                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2115                         break;
2116 
2117                 pass_count++;
2118         }
2119 
2120         /* Restore MCR setting */
2121         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2122                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2123                 0, MOS_WDR_TIMEOUT);
2124 
2125         kfree(buf);
2126 
2127         if (pass_count == 16)
2128                 return 1;
2129 
2130         return 0;
2131 }
2132 
2133 static int mos7840_probe(struct usb_serial *serial,
2134                                 const struct usb_device_id *id)
2135 {
2136         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2137         u8 *buf;
2138         int device_type;
2139 
2140         if (product == MOSCHIP_DEVICE_ID_7810 ||
2141                 product == MOSCHIP_DEVICE_ID_7820) {
2142                 device_type = product;
2143                 goto out;
2144         }
2145 
2146         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2147         if (!buf)
2148                 return -ENOMEM;
2149 
2150         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2151                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2152                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2153 
2154         /* For a MCS7840 device GPIO0 must be set to 1 */
2155         if (buf[0] & 0x01)
2156                 device_type = MOSCHIP_DEVICE_ID_7840;
2157         else if (mos7810_check(serial))
2158                 device_type = MOSCHIP_DEVICE_ID_7810;
2159         else
2160                 device_type = MOSCHIP_DEVICE_ID_7820;
2161 
2162         kfree(buf);
2163 out:
2164         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2165 
2166         return 0;
2167 }
2168 
2169 static int mos7840_calc_num_ports(struct usb_serial *serial)
2170 {
2171         int device_type = (unsigned long)usb_get_serial_data(serial);
2172         int mos7840_num_ports;
2173 
2174         mos7840_num_ports = (device_type >> 4) & 0x000F;
2175 
2176         return mos7840_num_ports;
2177 }
2178 
2179 static int mos7840_port_probe(struct usb_serial_port *port)
2180 {
2181         struct usb_serial *serial = port->serial;
2182         int device_type = (unsigned long)usb_get_serial_data(serial);
2183         struct moschip_port *mos7840_port;
2184         int status;
2185         int pnum;
2186         __u16 Data;
2187 
2188         /* we set up the pointers to the endpoints in the mos7840_open *
2189          * function, as the structures aren't created yet.             */
2190 
2191         pnum = port->port_number;
2192 
2193         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2194         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2195         if (!mos7840_port)
2196                 return -ENOMEM;
2197 
2198         /* Initialize all port interrupt end point to port 0 int
2199          * endpoint. Our device has only one interrupt end point
2200          * common to all port */
2201 
2202         mos7840_port->port = port;
2203         mos7840_set_port_private(port, mos7840_port);
2204         spin_lock_init(&mos7840_port->pool_lock);
2205 
2206         /* minor is not initialised until later by
2207          * usb-serial.c:get_free_serial() and cannot therefore be used
2208          * to index device instances */
2209         mos7840_port->port_num = pnum + 1;
2210         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2211         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2212 
2213         if (mos7840_port->port_num == 1) {
2214                 mos7840_port->SpRegOffset = 0x0;
2215                 mos7840_port->ControlRegOffset = 0x1;
2216                 mos7840_port->DcrRegOffset = 0x4;
2217         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2218                 mos7840_port->SpRegOffset = 0x8;
2219                 mos7840_port->ControlRegOffset = 0x9;
2220                 mos7840_port->DcrRegOffset = 0x16;
2221         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2222                 mos7840_port->SpRegOffset = 0xa;
2223                 mos7840_port->ControlRegOffset = 0xb;
2224                 mos7840_port->DcrRegOffset = 0x19;
2225         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2226                 mos7840_port->SpRegOffset = 0xa;
2227                 mos7840_port->ControlRegOffset = 0xb;
2228                 mos7840_port->DcrRegOffset = 0x19;
2229         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2230                 mos7840_port->SpRegOffset = 0xc;
2231                 mos7840_port->ControlRegOffset = 0xd;
2232                 mos7840_port->DcrRegOffset = 0x1c;
2233         }
2234         mos7840_dump_serial_port(port, mos7840_port);
2235         mos7840_set_port_private(port, mos7840_port);
2236 
2237         /* enable rx_disable bit in control register */
2238         status = mos7840_get_reg_sync(port,
2239                         mos7840_port->ControlRegOffset, &Data);
2240         if (status < 0) {
2241                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2242                 goto out;
2243         } else
2244                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2245         Data |= 0x08;   /* setting driver done bit */
2246         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2247                            modem status reg */
2248 
2249         /* Data |= 0x20; //rx_disable bit */
2250         status = mos7840_set_reg_sync(port,
2251                         mos7840_port->ControlRegOffset, Data);
2252         if (status < 0) {
2253                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2254                 goto out;
2255         } else
2256                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2257 
2258         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2259            and 0x24 in DCR3 */
2260         Data = 0x01;
2261         status = mos7840_set_reg_sync(port,
2262                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2263         if (status < 0) {
2264                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2265                 goto out;
2266         } else
2267                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2268 
2269         Data = 0x05;
2270         status = mos7840_set_reg_sync(port,
2271                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2272         if (status < 0) {
2273                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2274                 goto out;
2275         } else
2276                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2277 
2278         Data = 0x24;
2279         status = mos7840_set_reg_sync(port,
2280                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2281         if (status < 0) {
2282                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2283                 goto out;
2284         } else
2285                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2286 
2287         /* write values in clkstart0x0 and clkmulti 0x20 */
2288         Data = 0x0;
2289         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2290         if (status < 0) {
2291                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2292                 goto out;
2293         } else
2294                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2295 
2296         Data = 0x20;
2297         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2298         if (status < 0) {
2299                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2300                 goto error;
2301         } else
2302                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2303 
2304         /* write value 0x0 to scratchpad register */
2305         Data = 0x00;
2306         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2307         if (status < 0) {
2308                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2309                 goto out;
2310         } else
2311                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2312 
2313         /* Zero Length flag register */
2314         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2315                 Data = 0xff;
2316                 status = mos7840_set_reg_sync(port,
2317                                 (__u16) (ZLP_REG1 +
2318                                         ((__u16)mos7840_port->port_num)), Data);
2319                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2320                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2321                 if (status < 0) {
2322                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2323                         goto out;
2324                 } else
2325                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2326         } else {
2327                 Data = 0xff;
2328                 status = mos7840_set_reg_sync(port,
2329                                 (__u16) (ZLP_REG1 +
2330                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2331                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2332                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2333                 if (status < 0) {
2334                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2335                         goto out;
2336                 } else
2337                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2338 
2339         }
2340         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2341         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2342         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2343                         GFP_KERNEL);
2344         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2345                         !mos7840_port->dr) {
2346                 status = -ENOMEM;
2347                 goto error;
2348         }
2349 
2350         mos7840_port->has_led = false;
2351 
2352         /* Initialize LED timers */
2353         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2354                 mos7840_port->has_led = true;
2355 
2356                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2357                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2358                                                                 GFP_KERNEL);
2359                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2360                         status = -ENOMEM;
2361                         goto error;
2362                 }
2363 
2364                 init_timer(&mos7840_port->led_timer1);
2365                 mos7840_port->led_timer1.function = mos7840_led_off;
2366                 mos7840_port->led_timer1.expires =
2367                         jiffies + msecs_to_jiffies(LED_ON_MS);
2368                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2369 
2370                 init_timer(&mos7840_port->led_timer2);
2371                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2372                 mos7840_port->led_timer2.expires =
2373                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2374                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2375 
2376                 /* Turn off LED */
2377                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2378         }
2379 out:
2380         if (pnum == serial->num_ports - 1) {
2381                 /* Zero Length flag enable */
2382                 Data = 0x0f;
2383                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2384                 if (status < 0) {
2385                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2386                         goto error;
2387                 } else
2388                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2389 
2390                 /* setting configuration feature to one */
2391                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2392                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2393                                 MOS_WDR_TIMEOUT);
2394         }
2395         return 0;
2396 error:
2397         kfree(mos7840_port->led_dr);
2398         usb_free_urb(mos7840_port->led_urb);
2399         kfree(mos7840_port->dr);
2400         kfree(mos7840_port->ctrl_buf);
2401         usb_free_urb(mos7840_port->control_urb);
2402         kfree(mos7840_port);
2403 
2404         return status;
2405 }
2406 
2407 static int mos7840_port_remove(struct usb_serial_port *port)
2408 {
2409         struct moschip_port *mos7840_port;
2410 
2411         mos7840_port = mos7840_get_port_private(port);
2412 
2413         if (mos7840_port->has_led) {
2414                 /* Turn off LED */
2415                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2416 
2417                 del_timer_sync(&mos7840_port->led_timer1);
2418                 del_timer_sync(&mos7840_port->led_timer2);
2419 
2420                 usb_kill_urb(mos7840_port->led_urb);
2421                 usb_free_urb(mos7840_port->led_urb);
2422                 kfree(mos7840_port->led_dr);
2423         }
2424         usb_kill_urb(mos7840_port->control_urb);
2425         usb_free_urb(mos7840_port->control_urb);
2426         kfree(mos7840_port->ctrl_buf);
2427         kfree(mos7840_port->dr);
2428         kfree(mos7840_port);
2429 
2430         return 0;
2431 }
2432 
2433 static struct usb_serial_driver moschip7840_4port_device = {
2434         .driver = {
2435                    .owner = THIS_MODULE,
2436                    .name = "mos7840",
2437                    },
2438         .description = DRIVER_DESC,
2439         .id_table = id_table,
2440         .num_ports = 4,
2441         .open = mos7840_open,
2442         .close = mos7840_close,
2443         .write = mos7840_write,
2444         .write_room = mos7840_write_room,
2445         .chars_in_buffer = mos7840_chars_in_buffer,
2446         .throttle = mos7840_throttle,
2447         .unthrottle = mos7840_unthrottle,
2448         .calc_num_ports = mos7840_calc_num_ports,
2449         .probe = mos7840_probe,
2450         .ioctl = mos7840_ioctl,
2451         .set_termios = mos7840_set_termios,
2452         .break_ctl = mos7840_break,
2453         .tiocmget = mos7840_tiocmget,
2454         .tiocmset = mos7840_tiocmset,
2455         .tiocmiwait = usb_serial_generic_tiocmiwait,
2456         .get_icount = usb_serial_generic_get_icount,
2457         .port_probe = mos7840_port_probe,
2458         .port_remove = mos7840_port_remove,
2459         .read_bulk_callback = mos7840_bulk_in_callback,
2460         .read_int_callback = mos7840_interrupt_callback,
2461 };
2462 
2463 static struct usb_serial_driver * const serial_drivers[] = {
2464         &moschip7840_4port_device, NULL
2465 };
2466 
2467 module_usb_serial_driver(serial_drivers, id_table);
2468 
2469 MODULE_DESCRIPTION(DRIVER_DESC);
2470 MODULE_LICENSE("GPL");
2471 

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