Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1

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         if (mos7840_port_paranoia_check(port, __func__))
1313                 return -1;
1314 
1315         serial = port->serial;
1316         if (mos7840_serial_paranoia_check(serial, __func__))
1317                 return -1;
1318 
1319         mos7840_port = mos7840_get_port_private(port);
1320         if (mos7840_port == NULL)
1321                 return -1;
1322 
1323         /* try to find a free urb in the list */
1324         urb = NULL;
1325 
1326         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1327         for (i = 0; i < NUM_URBS; ++i) {
1328                 if (!mos7840_port->busy[i]) {
1329                         mos7840_port->busy[i] = 1;
1330                         urb = mos7840_port->write_urb_pool[i];
1331                         dev_dbg(&port->dev, "URB:%d\n", i);
1332                         break;
1333                 }
1334         }
1335         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1336 
1337         if (urb == NULL) {
1338                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1339                 goto exit;
1340         }
1341 
1342         if (urb->transfer_buffer == NULL) {
1343                 urb->transfer_buffer =
1344                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1345                 if (!urb->transfer_buffer)
1346                         goto exit;
1347         }
1348         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1349 
1350         memcpy(urb->transfer_buffer, current_position, transfer_size);
1351 
1352         /* fill urb with data and submit  */
1353         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1354                 usb_fill_bulk_urb(urb,
1355                         serial->dev,
1356                         usb_sndbulkpipe(serial->dev,
1357                                 (port->bulk_out_endpointAddress) + 2),
1358                         urb->transfer_buffer,
1359                         transfer_size,
1360                         mos7840_bulk_out_data_callback, mos7840_port);
1361         } else {
1362                 usb_fill_bulk_urb(urb,
1363                         serial->dev,
1364                         usb_sndbulkpipe(serial->dev,
1365                                 port->bulk_out_endpointAddress),
1366                         urb->transfer_buffer,
1367                         transfer_size,
1368                         mos7840_bulk_out_data_callback, mos7840_port);
1369         }
1370 
1371         data1 = urb->transfer_buffer;
1372         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1373 
1374         if (mos7840_port->has_led)
1375                 mos7840_led_activity(port);
1376 
1377         /* send it down the pipe */
1378         status = usb_submit_urb(urb, GFP_ATOMIC);
1379 
1380         if (status) {
1381                 mos7840_port->busy[i] = 0;
1382                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1383                         "with status = %d\n", __func__, status);
1384                 bytes_sent = status;
1385                 goto exit;
1386         }
1387         bytes_sent = transfer_size;
1388         port->icount.tx += transfer_size;
1389         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1390 exit:
1391         return bytes_sent;
1392 
1393 }
1394 
1395 /*****************************************************************************
1396  * mos7840_throttle
1397  *      this function is called by the tty driver when it wants to stop the data
1398  *      being read from the port.
1399  *****************************************************************************/
1400 
1401 static void mos7840_throttle(struct tty_struct *tty)
1402 {
1403         struct usb_serial_port *port = tty->driver_data;
1404         struct moschip_port *mos7840_port;
1405         int status;
1406 
1407         if (mos7840_port_paranoia_check(port, __func__))
1408                 return;
1409 
1410         mos7840_port = mos7840_get_port_private(port);
1411 
1412         if (mos7840_port == NULL)
1413                 return;
1414 
1415         if (!mos7840_port->open) {
1416                 dev_dbg(&port->dev, "%s", "port not opened\n");
1417                 return;
1418         }
1419 
1420         /* if we are implementing XON/XOFF, send the stop character */
1421         if (I_IXOFF(tty)) {
1422                 unsigned char stop_char = STOP_CHAR(tty);
1423                 status = mos7840_write(tty, port, &stop_char, 1);
1424                 if (status <= 0)
1425                         return;
1426         }
1427         /* if we are implementing RTS/CTS, toggle that line */
1428         if (tty->termios.c_cflag & CRTSCTS) {
1429                 mos7840_port->shadowMCR &= ~MCR_RTS;
1430                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1431                                          mos7840_port->shadowMCR);
1432                 if (status < 0)
1433                         return;
1434         }
1435 }
1436 
1437 /*****************************************************************************
1438  * mos7840_unthrottle
1439  *      this function is called by the tty driver when it wants to resume
1440  *      the data being read from the port (called after mos7840_throttle is
1441  *      called)
1442  *****************************************************************************/
1443 static void mos7840_unthrottle(struct tty_struct *tty)
1444 {
1445         struct usb_serial_port *port = tty->driver_data;
1446         int status;
1447         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1448 
1449         if (mos7840_port_paranoia_check(port, __func__))
1450                 return;
1451 
1452         if (mos7840_port == NULL)
1453                 return;
1454 
1455         if (!mos7840_port->open) {
1456                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1457                 return;
1458         }
1459 
1460         /* if we are implementing XON/XOFF, send the start character */
1461         if (I_IXOFF(tty)) {
1462                 unsigned char start_char = START_CHAR(tty);
1463                 status = mos7840_write(tty, port, &start_char, 1);
1464                 if (status <= 0)
1465                         return;
1466         }
1467 
1468         /* if we are implementing RTS/CTS, toggle that line */
1469         if (tty->termios.c_cflag & CRTSCTS) {
1470                 mos7840_port->shadowMCR |= MCR_RTS;
1471                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1472                                          mos7840_port->shadowMCR);
1473                 if (status < 0)
1474                         return;
1475         }
1476 }
1477 
1478 static int mos7840_tiocmget(struct tty_struct *tty)
1479 {
1480         struct usb_serial_port *port = tty->driver_data;
1481         struct moschip_port *mos7840_port;
1482         unsigned int result;
1483         __u16 msr;
1484         __u16 mcr;
1485         int status;
1486         mos7840_port = mos7840_get_port_private(port);
1487 
1488         if (mos7840_port == NULL)
1489                 return -ENODEV;
1490 
1491         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1492         if (status != 1)
1493                 return -EIO;
1494         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1495         if (status != 1)
1496                 return -EIO;
1497         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1498             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1499             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1500             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1501             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1502             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1503             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1504 
1505         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1506 
1507         return result;
1508 }
1509 
1510 static int mos7840_tiocmset(struct tty_struct *tty,
1511                             unsigned int set, unsigned int clear)
1512 {
1513         struct usb_serial_port *port = tty->driver_data;
1514         struct moschip_port *mos7840_port;
1515         unsigned int mcr;
1516         int status;
1517 
1518         mos7840_port = mos7840_get_port_private(port);
1519 
1520         if (mos7840_port == NULL)
1521                 return -ENODEV;
1522 
1523         /* FIXME: What locks the port registers ? */
1524         mcr = mos7840_port->shadowMCR;
1525         if (clear & TIOCM_RTS)
1526                 mcr &= ~MCR_RTS;
1527         if (clear & TIOCM_DTR)
1528                 mcr &= ~MCR_DTR;
1529         if (clear & TIOCM_LOOP)
1530                 mcr &= ~MCR_LOOPBACK;
1531 
1532         if (set & TIOCM_RTS)
1533                 mcr |= MCR_RTS;
1534         if (set & TIOCM_DTR)
1535                 mcr |= MCR_DTR;
1536         if (set & TIOCM_LOOP)
1537                 mcr |= MCR_LOOPBACK;
1538 
1539         mos7840_port->shadowMCR = mcr;
1540 
1541         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1542         if (status < 0) {
1543                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1544                 return status;
1545         }
1546 
1547         return 0;
1548 }
1549 
1550 /*****************************************************************************
1551  * mos7840_calc_baud_rate_divisor
1552  *      this function calculates the proper baud rate divisor for the specified
1553  *      baud rate.
1554  *****************************************************************************/
1555 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1556                                           int baudRate, int *divisor,
1557                                           __u16 *clk_sel_val)
1558 {
1559         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1560 
1561         if (baudRate <= 115200) {
1562                 *divisor = 115200 / baudRate;
1563                 *clk_sel_val = 0x0;
1564         }
1565         if ((baudRate > 115200) && (baudRate <= 230400)) {
1566                 *divisor = 230400 / baudRate;
1567                 *clk_sel_val = 0x10;
1568         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1569                 *divisor = 403200 / baudRate;
1570                 *clk_sel_val = 0x20;
1571         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1572                 *divisor = 460800 / baudRate;
1573                 *clk_sel_val = 0x30;
1574         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1575                 *divisor = 806400 / baudRate;
1576                 *clk_sel_val = 0x40;
1577         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1578                 *divisor = 921600 / baudRate;
1579                 *clk_sel_val = 0x50;
1580         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1581                 *divisor = 1572864 / baudRate;
1582                 *clk_sel_val = 0x60;
1583         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1584                 *divisor = 3145728 / baudRate;
1585                 *clk_sel_val = 0x70;
1586         }
1587         return 0;
1588 }
1589 
1590 /*****************************************************************************
1591  * mos7840_send_cmd_write_baud_rate
1592  *      this function sends the proper command to change the baud rate of the
1593  *      specified port.
1594  *****************************************************************************/
1595 
1596 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1597                                             int baudRate)
1598 {
1599         int divisor = 0;
1600         int status;
1601         __u16 Data;
1602         unsigned char number;
1603         __u16 clk_sel_val;
1604         struct usb_serial_port *port;
1605 
1606         if (mos7840_port == NULL)
1607                 return -1;
1608 
1609         port = mos7840_port->port;
1610         if (mos7840_port_paranoia_check(port, __func__))
1611                 return -1;
1612 
1613         if (mos7840_serial_paranoia_check(port->serial, __func__))
1614                 return -1;
1615 
1616         number = mos7840_port->port->port_number;
1617 
1618         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1619         /* reset clk_uart_sel in spregOffset */
1620         if (baudRate > 115200) {
1621 #ifdef HW_flow_control
1622                 /* NOTE: need to see the pther register to modify */
1623                 /* setting h/w flow control bit to 1 */
1624                 Data = 0x2b;
1625                 mos7840_port->shadowMCR = Data;
1626                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1627                                                                         Data);
1628                 if (status < 0) {
1629                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1630                         return -1;
1631                 }
1632 #endif
1633 
1634         } else {
1635 #ifdef HW_flow_control
1636                 /* setting h/w flow control bit to 0 */
1637                 Data = 0xb;
1638                 mos7840_port->shadowMCR = Data;
1639                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1640                                                                         Data);
1641                 if (status < 0) {
1642                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1643                         return -1;
1644                 }
1645 #endif
1646 
1647         }
1648 
1649         if (1) {                /* baudRate <= 115200) */
1650                 clk_sel_val = 0x0;
1651                 Data = 0x0;
1652                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1653                                                    &clk_sel_val);
1654                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1655                                                                  &Data);
1656                 if (status < 0) {
1657                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1658                         return -1;
1659                 }
1660                 Data = (Data & 0x8f) | clk_sel_val;
1661                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1662                                                                 Data);
1663                 if (status < 0) {
1664                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1665                         return -1;
1666                 }
1667                 /* Calculate the Divisor */
1668 
1669                 if (status) {
1670                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1671                         return status;
1672                 }
1673                 /* Enable access to divisor latch */
1674                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1675                 mos7840_port->shadowLCR = Data;
1676                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1677 
1678                 /* Write the divisor */
1679                 Data = (unsigned char)(divisor & 0xff);
1680                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1681                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1682 
1683                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1684                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1685                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1686 
1687                 /* Disable access to divisor latch */
1688                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1689                 mos7840_port->shadowLCR = Data;
1690                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1691 
1692         }
1693         return status;
1694 }
1695 
1696 /*****************************************************************************
1697  * mos7840_change_port_settings
1698  *      This routine is called to set the UART on the device to match
1699  *      the specified new settings.
1700  *****************************************************************************/
1701 
1702 static void mos7840_change_port_settings(struct tty_struct *tty,
1703         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1704 {
1705         int baud;
1706         unsigned cflag;
1707         unsigned iflag;
1708         __u8 lData;
1709         __u8 lParity;
1710         __u8 lStop;
1711         int status;
1712         __u16 Data;
1713         struct usb_serial_port *port;
1714         struct usb_serial *serial;
1715 
1716         if (mos7840_port == NULL)
1717                 return;
1718 
1719         port = mos7840_port->port;
1720 
1721         if (mos7840_port_paranoia_check(port, __func__))
1722                 return;
1723 
1724         if (mos7840_serial_paranoia_check(port->serial, __func__))
1725                 return;
1726 
1727         serial = port->serial;
1728 
1729         if (!mos7840_port->open) {
1730                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1731                 return;
1732         }
1733 
1734         lData = LCR_BITS_8;
1735         lStop = LCR_STOP_1;
1736         lParity = LCR_PAR_NONE;
1737 
1738         cflag = tty->termios.c_cflag;
1739         iflag = tty->termios.c_iflag;
1740 
1741         /* Change the number of bits */
1742         switch (cflag & CSIZE) {
1743         case CS5:
1744                 lData = LCR_BITS_5;
1745                 break;
1746 
1747         case CS6:
1748                 lData = LCR_BITS_6;
1749                 break;
1750 
1751         case CS7:
1752                 lData = LCR_BITS_7;
1753                 break;
1754 
1755         default:
1756         case CS8:
1757                 lData = LCR_BITS_8;
1758                 break;
1759         }
1760 
1761         /* Change the Parity bit */
1762         if (cflag & PARENB) {
1763                 if (cflag & PARODD) {
1764                         lParity = LCR_PAR_ODD;
1765                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1766                 } else {
1767                         lParity = LCR_PAR_EVEN;
1768                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1769                 }
1770 
1771         } else {
1772                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1773         }
1774 
1775         if (cflag & CMSPAR)
1776                 lParity = lParity | 0x20;
1777 
1778         /* Change the Stop bit */
1779         if (cflag & CSTOPB) {
1780                 lStop = LCR_STOP_2;
1781                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1782         } else {
1783                 lStop = LCR_STOP_1;
1784                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1785         }
1786 
1787         /* Update the LCR with the correct value */
1788         mos7840_port->shadowLCR &=
1789             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1790         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1791 
1792         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1793                 mos7840_port->shadowLCR);
1794         /* Disable Interrupts */
1795         Data = 0x00;
1796         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1797 
1798         Data = 0x00;
1799         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1800 
1801         Data = 0xcf;
1802         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1803 
1804         /* Send the updated LCR value to the mos7840 */
1805         Data = mos7840_port->shadowLCR;
1806 
1807         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1808 
1809         Data = 0x00b;
1810         mos7840_port->shadowMCR = Data;
1811         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1812         Data = 0x00b;
1813         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1814 
1815         /* set up the MCR register and send it to the mos7840 */
1816 
1817         mos7840_port->shadowMCR = MCR_MASTER_IE;
1818         if (cflag & CBAUD)
1819                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1820 
1821         if (cflag & CRTSCTS)
1822                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1823         else
1824                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1825 
1826         Data = mos7840_port->shadowMCR;
1827         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1828 
1829         /* Determine divisor based on baud rate */
1830         baud = tty_get_baud_rate(tty);
1831 
1832         if (!baud) {
1833                 /* pick a default, any default... */
1834                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1835                 baud = 9600;
1836         }
1837 
1838         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1839         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1840 
1841         /* Enable Interrupts */
1842         Data = 0x0c;
1843         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1844 
1845         if (mos7840_port->read_urb_busy == false) {
1846                 mos7840_port->read_urb_busy = true;
1847                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1848                 if (status) {
1849                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1850                             status);
1851                         mos7840_port->read_urb_busy = false;
1852                 }
1853         }
1854         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1855                 mos7840_port->shadowLCR);
1856 }
1857 
1858 /*****************************************************************************
1859  * mos7840_set_termios
1860  *      this function is called by the tty driver when it wants to change
1861  *      the termios structure
1862  *****************************************************************************/
1863 
1864 static void mos7840_set_termios(struct tty_struct *tty,
1865                                 struct usb_serial_port *port,
1866                                 struct ktermios *old_termios)
1867 {
1868         int status;
1869         unsigned int cflag;
1870         struct usb_serial *serial;
1871         struct moschip_port *mos7840_port;
1872 
1873         if (mos7840_port_paranoia_check(port, __func__))
1874                 return;
1875 
1876         serial = port->serial;
1877 
1878         if (mos7840_serial_paranoia_check(serial, __func__))
1879                 return;
1880 
1881         mos7840_port = mos7840_get_port_private(port);
1882 
1883         if (mos7840_port == NULL)
1884                 return;
1885 
1886         if (!mos7840_port->open) {
1887                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1888                 return;
1889         }
1890 
1891         dev_dbg(&port->dev, "%s", "setting termios - \n");
1892 
1893         cflag = tty->termios.c_cflag;
1894 
1895         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1896                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1897         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1898                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1899 
1900         /* change the port settings to the new ones specified */
1901 
1902         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1903 
1904         if (!mos7840_port->read_urb) {
1905                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1906                 return;
1907         }
1908 
1909         if (mos7840_port->read_urb_busy == false) {
1910                 mos7840_port->read_urb_busy = true;
1911                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1912                 if (status) {
1913                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1914                             status);
1915                         mos7840_port->read_urb_busy = false;
1916                 }
1917         }
1918 }
1919 
1920 /*****************************************************************************
1921  * mos7840_get_lsr_info - get line status register info
1922  *
1923  * Purpose: Let user call ioctl() to get info when the UART physically
1924  *          is emptied.  On bus types like RS485, the transmitter must
1925  *          release the bus after transmitting. This must be done when
1926  *          the transmit shift register is empty, not be done when the
1927  *          transmit holding register is empty.  This functionality
1928  *          allows an RS485 driver to be written in user space.
1929  *****************************************************************************/
1930 
1931 static int mos7840_get_lsr_info(struct tty_struct *tty,
1932                                 unsigned int __user *value)
1933 {
1934         int count;
1935         unsigned int result = 0;
1936 
1937         count = mos7840_chars_in_buffer(tty);
1938         if (count == 0)
1939                 result = TIOCSER_TEMT;
1940 
1941         if (copy_to_user(value, &result, sizeof(int)))
1942                 return -EFAULT;
1943         return 0;
1944 }
1945 
1946 /*****************************************************************************
1947  * mos7840_get_serial_info
1948  *      function to get information about serial port
1949  *****************************************************************************/
1950 
1951 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1952                                    struct serial_struct __user *retinfo)
1953 {
1954         struct serial_struct tmp;
1955 
1956         if (mos7840_port == NULL)
1957                 return -1;
1958 
1959         if (!retinfo)
1960                 return -EFAULT;
1961 
1962         memset(&tmp, 0, sizeof(tmp));
1963 
1964         tmp.type = PORT_16550A;
1965         tmp.line = mos7840_port->port->minor;
1966         tmp.port = mos7840_port->port->port_number;
1967         tmp.irq = 0;
1968         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1969         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1970         tmp.baud_base = 9600;
1971         tmp.close_delay = 5 * HZ;
1972         tmp.closing_wait = 30 * HZ;
1973 
1974         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1975                 return -EFAULT;
1976         return 0;
1977 }
1978 
1979 /*****************************************************************************
1980  * SerialIoctl
1981  *      this function handles any ioctl calls to the driver
1982  *****************************************************************************/
1983 
1984 static int mos7840_ioctl(struct tty_struct *tty,
1985                          unsigned int cmd, unsigned long arg)
1986 {
1987         struct usb_serial_port *port = tty->driver_data;
1988         void __user *argp = (void __user *)arg;
1989         struct moschip_port *mos7840_port;
1990 
1991         if (mos7840_port_paranoia_check(port, __func__))
1992                 return -1;
1993 
1994         mos7840_port = mos7840_get_port_private(port);
1995 
1996         if (mos7840_port == NULL)
1997                 return -1;
1998 
1999         switch (cmd) {
2000                 /* return number of bytes available */
2001 
2002         case TIOCSERGETLSR:
2003                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2004                 return mos7840_get_lsr_info(tty, argp);
2005 
2006         case TIOCGSERIAL:
2007                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2008                 return mos7840_get_serial_info(mos7840_port, argp);
2009 
2010         case TIOCSSERIAL:
2011                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2012                 break;
2013         default:
2014                 break;
2015         }
2016         return -ENOIOCTLCMD;
2017 }
2018 
2019 static int mos7810_check(struct usb_serial *serial)
2020 {
2021         int i, pass_count = 0;
2022         u8 *buf;
2023         __u16 data = 0, mcr_data = 0;
2024         __u16 test_pattern = 0x55AA;
2025         int res;
2026 
2027         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2028         if (!buf)
2029                 return 0;       /* failed to identify 7810 */
2030 
2031         /* Store MCR setting */
2032         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2033                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2034                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2035         if (res == VENDOR_READ_LENGTH)
2036                 mcr_data = *buf;
2037 
2038         for (i = 0; i < 16; i++) {
2039                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2040                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2041                         MCS_WRREQ, MCS_WR_RTYPE,
2042                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2043                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2044 
2045                 /* Read the test pattern back */
2046                 res = usb_control_msg(serial->dev,
2047                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2048                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2049                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2050                 if (res == VENDOR_READ_LENGTH)
2051                         data = *buf;
2052 
2053                 /* If this is a MCS7810 device, both test patterns must match */
2054                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2055                         break;
2056 
2057                 pass_count++;
2058         }
2059 
2060         /* Restore MCR setting */
2061         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2062                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2063                 0, MOS_WDR_TIMEOUT);
2064 
2065         kfree(buf);
2066 
2067         if (pass_count == 16)
2068                 return 1;
2069 
2070         return 0;
2071 }
2072 
2073 static int mos7840_probe(struct usb_serial *serial,
2074                                 const struct usb_device_id *id)
2075 {
2076         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2077         u8 *buf;
2078         int device_type;
2079 
2080         if (product == MOSCHIP_DEVICE_ID_7810 ||
2081                 product == MOSCHIP_DEVICE_ID_7820) {
2082                 device_type = product;
2083                 goto out;
2084         }
2085 
2086         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2087         if (!buf)
2088                 return -ENOMEM;
2089 
2090         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2091                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2092                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2093 
2094         /* For a MCS7840 device GPIO0 must be set to 1 */
2095         if (buf[0] & 0x01)
2096                 device_type = MOSCHIP_DEVICE_ID_7840;
2097         else if (mos7810_check(serial))
2098                 device_type = MOSCHIP_DEVICE_ID_7810;
2099         else
2100                 device_type = MOSCHIP_DEVICE_ID_7820;
2101 
2102         kfree(buf);
2103 out:
2104         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2105 
2106         return 0;
2107 }
2108 
2109 static int mos7840_calc_num_ports(struct usb_serial *serial)
2110 {
2111         int device_type = (unsigned long)usb_get_serial_data(serial);
2112         int mos7840_num_ports;
2113 
2114         mos7840_num_ports = (device_type >> 4) & 0x000F;
2115 
2116         return mos7840_num_ports;
2117 }
2118 
2119 static int mos7840_port_probe(struct usb_serial_port *port)
2120 {
2121         struct usb_serial *serial = port->serial;
2122         int device_type = (unsigned long)usb_get_serial_data(serial);
2123         struct moschip_port *mos7840_port;
2124         int status;
2125         int pnum;
2126         __u16 Data;
2127 
2128         /* we set up the pointers to the endpoints in the mos7840_open *
2129          * function, as the structures aren't created yet.             */
2130 
2131         pnum = port->port_number;
2132 
2133         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2134         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2135         if (!mos7840_port)
2136                 return -ENOMEM;
2137 
2138         /* Initialize all port interrupt end point to port 0 int
2139          * endpoint. Our device has only one interrupt end point
2140          * common to all port */
2141 
2142         mos7840_port->port = port;
2143         mos7840_set_port_private(port, mos7840_port);
2144         spin_lock_init(&mos7840_port->pool_lock);
2145 
2146         /* minor is not initialised until later by
2147          * usb-serial.c:get_free_serial() and cannot therefore be used
2148          * to index device instances */
2149         mos7840_port->port_num = pnum + 1;
2150         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2151         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2152 
2153         if (mos7840_port->port_num == 1) {
2154                 mos7840_port->SpRegOffset = 0x0;
2155                 mos7840_port->ControlRegOffset = 0x1;
2156                 mos7840_port->DcrRegOffset = 0x4;
2157         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2158                 mos7840_port->SpRegOffset = 0x8;
2159                 mos7840_port->ControlRegOffset = 0x9;
2160                 mos7840_port->DcrRegOffset = 0x16;
2161         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2162                 mos7840_port->SpRegOffset = 0xa;
2163                 mos7840_port->ControlRegOffset = 0xb;
2164                 mos7840_port->DcrRegOffset = 0x19;
2165         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2166                 mos7840_port->SpRegOffset = 0xa;
2167                 mos7840_port->ControlRegOffset = 0xb;
2168                 mos7840_port->DcrRegOffset = 0x19;
2169         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2170                 mos7840_port->SpRegOffset = 0xc;
2171                 mos7840_port->ControlRegOffset = 0xd;
2172                 mos7840_port->DcrRegOffset = 0x1c;
2173         }
2174         mos7840_dump_serial_port(port, mos7840_port);
2175         mos7840_set_port_private(port, mos7840_port);
2176 
2177         /* enable rx_disable bit in control register */
2178         status = mos7840_get_reg_sync(port,
2179                         mos7840_port->ControlRegOffset, &Data);
2180         if (status < 0) {
2181                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2182                 goto out;
2183         } else
2184                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2185         Data |= 0x08;   /* setting driver done bit */
2186         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2187                            modem status reg */
2188 
2189         /* Data |= 0x20; //rx_disable bit */
2190         status = mos7840_set_reg_sync(port,
2191                         mos7840_port->ControlRegOffset, Data);
2192         if (status < 0) {
2193                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2194                 goto out;
2195         } else
2196                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2197 
2198         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2199            and 0x24 in DCR3 */
2200         Data = 0x01;
2201         status = mos7840_set_reg_sync(port,
2202                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2203         if (status < 0) {
2204                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2205                 goto out;
2206         } else
2207                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2208 
2209         Data = 0x05;
2210         status = mos7840_set_reg_sync(port,
2211                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2212         if (status < 0) {
2213                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2214                 goto out;
2215         } else
2216                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2217 
2218         Data = 0x24;
2219         status = mos7840_set_reg_sync(port,
2220                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2221         if (status < 0) {
2222                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2223                 goto out;
2224         } else
2225                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2226 
2227         /* write values in clkstart0x0 and clkmulti 0x20 */
2228         Data = 0x0;
2229         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2230         if (status < 0) {
2231                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2232                 goto out;
2233         } else
2234                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2235 
2236         Data = 0x20;
2237         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2238         if (status < 0) {
2239                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2240                 goto error;
2241         } else
2242                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2243 
2244         /* write value 0x0 to scratchpad register */
2245         Data = 0x00;
2246         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2247         if (status < 0) {
2248                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2249                 goto out;
2250         } else
2251                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2252 
2253         /* Zero Length flag register */
2254         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2255                 Data = 0xff;
2256                 status = mos7840_set_reg_sync(port,
2257                                 (__u16) (ZLP_REG1 +
2258                                         ((__u16)mos7840_port->port_num)), Data);
2259                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2260                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2261                 if (status < 0) {
2262                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2263                         goto out;
2264                 } else
2265                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2266         } else {
2267                 Data = 0xff;
2268                 status = mos7840_set_reg_sync(port,
2269                                 (__u16) (ZLP_REG1 +
2270                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2271                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2272                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2273                 if (status < 0) {
2274                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2275                         goto out;
2276                 } else
2277                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2278 
2279         }
2280         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2281         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2282         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2283                         GFP_KERNEL);
2284         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2285                         !mos7840_port->dr) {
2286                 status = -ENOMEM;
2287                 goto error;
2288         }
2289 
2290         mos7840_port->has_led = false;
2291 
2292         /* Initialize LED timers */
2293         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2294                 mos7840_port->has_led = true;
2295 
2296                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2297                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2298                                                                 GFP_KERNEL);
2299                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2300                         status = -ENOMEM;
2301                         goto error;
2302                 }
2303 
2304                 init_timer(&mos7840_port->led_timer1);
2305                 mos7840_port->led_timer1.function = mos7840_led_off;
2306                 mos7840_port->led_timer1.expires =
2307                         jiffies + msecs_to_jiffies(LED_ON_MS);
2308                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2309 
2310                 init_timer(&mos7840_port->led_timer2);
2311                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2312                 mos7840_port->led_timer2.expires =
2313                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2314                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2315 
2316                 /* Turn off LED */
2317                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2318         }
2319 out:
2320         if (pnum == serial->num_ports - 1) {
2321                 /* Zero Length flag enable */
2322                 Data = 0x0f;
2323                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2324                 if (status < 0) {
2325                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2326                         goto error;
2327                 } else
2328                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2329 
2330                 /* setting configuration feature to one */
2331                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2332                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2333                                 MOS_WDR_TIMEOUT);
2334         }
2335         return 0;
2336 error:
2337         kfree(mos7840_port->led_dr);
2338         usb_free_urb(mos7840_port->led_urb);
2339         kfree(mos7840_port->dr);
2340         kfree(mos7840_port->ctrl_buf);
2341         usb_free_urb(mos7840_port->control_urb);
2342         kfree(mos7840_port);
2343 
2344         return status;
2345 }
2346 
2347 static int mos7840_port_remove(struct usb_serial_port *port)
2348 {
2349         struct moschip_port *mos7840_port;
2350 
2351         mos7840_port = mos7840_get_port_private(port);
2352 
2353         if (mos7840_port->has_led) {
2354                 /* Turn off LED */
2355                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2356 
2357                 del_timer_sync(&mos7840_port->led_timer1);
2358                 del_timer_sync(&mos7840_port->led_timer2);
2359 
2360                 usb_kill_urb(mos7840_port->led_urb);
2361                 usb_free_urb(mos7840_port->led_urb);
2362                 kfree(mos7840_port->led_dr);
2363         }
2364         usb_kill_urb(mos7840_port->control_urb);
2365         usb_free_urb(mos7840_port->control_urb);
2366         kfree(mos7840_port->ctrl_buf);
2367         kfree(mos7840_port->dr);
2368         kfree(mos7840_port);
2369 
2370         return 0;
2371 }
2372 
2373 static struct usb_serial_driver moschip7840_4port_device = {
2374         .driver = {
2375                    .owner = THIS_MODULE,
2376                    .name = "mos7840",
2377                    },
2378         .description = DRIVER_DESC,
2379         .id_table = id_table,
2380         .num_ports = 4,
2381         .open = mos7840_open,
2382         .close = mos7840_close,
2383         .write = mos7840_write,
2384         .write_room = mos7840_write_room,
2385         .chars_in_buffer = mos7840_chars_in_buffer,
2386         .throttle = mos7840_throttle,
2387         .unthrottle = mos7840_unthrottle,
2388         .calc_num_ports = mos7840_calc_num_ports,
2389         .probe = mos7840_probe,
2390         .ioctl = mos7840_ioctl,
2391         .set_termios = mos7840_set_termios,
2392         .break_ctl = mos7840_break,
2393         .tiocmget = mos7840_tiocmget,
2394         .tiocmset = mos7840_tiocmset,
2395         .tiocmiwait = usb_serial_generic_tiocmiwait,
2396         .get_icount = usb_serial_generic_get_icount,
2397         .port_probe = mos7840_port_probe,
2398         .port_remove = mos7840_port_remove,
2399         .read_bulk_callback = mos7840_bulk_in_callback,
2400         .read_int_callback = mos7840_interrupt_callback,
2401 };
2402 
2403 static struct usb_serial_driver * const serial_drivers[] = {
2404         &moschip7840_4port_device, NULL
2405 };
2406 
2407 module_usb_serial_driver(serial_drivers, id_table);
2408 
2409 MODULE_DESCRIPTION(DRIVER_DESC);
2410 MODULE_LICENSE("GPL");
2411 

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