Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

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 *read_urb;   /* read URB for this port */
218         __u8 shadowLCR;         /* last LCR value received */
219         __u8 shadowMCR;         /* last MCR value received */
220         char open;
221         char open_ports;
222         struct usb_serial_port *port;   /* loop back to the owner of this object */
223 
224         /* Offsets */
225         __u8 SpRegOffset;
226         __u8 ControlRegOffset;
227         __u8 DcrRegOffset;
228         /* for processing control URBS in interrupt context */
229         struct urb *control_urb;
230         struct usb_ctrlrequest *dr;
231         char *ctrl_buf;
232         int MsrLsr;
233 
234         spinlock_t pool_lock;
235         struct urb *write_urb_pool[NUM_URBS];
236         char busy[NUM_URBS];
237         bool read_urb_busy;
238 
239         /* For device(s) with LED indicator */
240         bool has_led;
241         struct timer_list led_timer1;   /* Timer for LED on */
242         struct timer_list led_timer2;   /* Timer for LED off */
243         struct urb *led_urb;
244         struct usb_ctrlrequest *led_dr;
245 
246         unsigned long flags;
247 };
248 
249 /*
250  * mos7840_set_reg_sync
251  *      To set the Control register by calling usb_fill_control_urb function
252  *      by passing usb_sndctrlpipe function as parameter.
253  */
254 
255 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
256                                 __u16 val)
257 {
258         struct usb_device *dev = port->serial->dev;
259         val = val & 0x00ff;
260         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
261 
262         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
263                                MCS_WR_RTYPE, val, reg, NULL, 0,
264                                MOS_WDR_TIMEOUT);
265 }
266 
267 /*
268  * mos7840_get_reg_sync
269  *      To set the Uart register by calling usb_fill_control_urb function by
270  *      passing usb_rcvctrlpipe function as parameter.
271  */
272 
273 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
274                                 __u16 *val)
275 {
276         struct usb_device *dev = port->serial->dev;
277         int ret = 0;
278         u8 *buf;
279 
280         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
281         if (!buf)
282                 return -ENOMEM;
283 
284         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
285                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
286                               MOS_WDR_TIMEOUT);
287         *val = buf[0];
288         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
289 
290         kfree(buf);
291         return ret;
292 }
293 
294 /*
295  * mos7840_set_uart_reg
296  *      To set the Uart register by calling usb_fill_control_urb function by
297  *      passing usb_sndctrlpipe function as parameter.
298  */
299 
300 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
301                                 __u16 val)
302 {
303 
304         struct usb_device *dev = port->serial->dev;
305         val = val & 0x00ff;
306         /* For the UART control registers, the application number need
307            to be Or'ed */
308         if (port->serial->num_ports == 4) {
309                 val |= ((__u16)port->port_number + 1) << 8;
310         } else {
311                 if (port->port_number == 0) {
312                         val |= ((__u16)port->port_number + 1) << 8;
313                 } else {
314                         val |= ((__u16)port->port_number + 2) << 8;
315                 }
316         }
317         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
318         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
319                                MCS_WR_RTYPE, val, reg, NULL, 0,
320                                MOS_WDR_TIMEOUT);
321 
322 }
323 
324 /*
325  * mos7840_get_uart_reg
326  *      To set the Control register by calling usb_fill_control_urb function
327  *      by passing usb_rcvctrlpipe function as parameter.
328  */
329 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
330                                 __u16 *val)
331 {
332         struct usb_device *dev = port->serial->dev;
333         int ret = 0;
334         __u16 Wval;
335         u8 *buf;
336 
337         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
338         if (!buf)
339                 return -ENOMEM;
340 
341         /* Wval  is same as application number */
342         if (port->serial->num_ports == 4) {
343                 Wval = ((__u16)port->port_number + 1) << 8;
344         } else {
345                 if (port->port_number == 0) {
346                         Wval = ((__u16)port->port_number + 1) << 8;
347                 } else {
348                         Wval = ((__u16)port->port_number + 2) << 8;
349                 }
350         }
351         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
352         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
353                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
354                               MOS_WDR_TIMEOUT);
355         *val = buf[0];
356 
357         kfree(buf);
358         return ret;
359 }
360 
361 static void mos7840_dump_serial_port(struct usb_serial_port *port,
362                                      struct moschip_port *mos7840_port)
363 {
364 
365         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
366         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
367         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
368 
369 }
370 
371 /************************************************************************/
372 /************************************************************************/
373 /*             I N T E R F A C E   F U N C T I O N S                    */
374 /*             I N T E R F A C E   F U N C T I O N S                    */
375 /************************************************************************/
376 /************************************************************************/
377 
378 static inline void mos7840_set_port_private(struct usb_serial_port *port,
379                                             struct moschip_port *data)
380 {
381         usb_set_serial_port_data(port, (void *)data);
382 }
383 
384 static inline struct moschip_port *mos7840_get_port_private(struct
385                                                             usb_serial_port
386                                                             *port)
387 {
388         return (struct moschip_port *)usb_get_serial_port_data(port);
389 }
390 
391 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
392 {
393         struct moschip_port *mos7840_port;
394         struct async_icount *icount;
395         mos7840_port = port;
396         if (new_msr &
397             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
398              MOS_MSR_DELTA_CD)) {
399                 icount = &mos7840_port->port->icount;
400 
401                 /* update input line counters */
402                 if (new_msr & MOS_MSR_DELTA_CTS)
403                         icount->cts++;
404                 if (new_msr & MOS_MSR_DELTA_DSR)
405                         icount->dsr++;
406                 if (new_msr & MOS_MSR_DELTA_CD)
407                         icount->dcd++;
408                 if (new_msr & MOS_MSR_DELTA_RI)
409                         icount->rng++;
410 
411                 wake_up_interruptible(&port->port->port.delta_msr_wait);
412         }
413 }
414 
415 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
416 {
417         struct async_icount *icount;
418 
419         if (new_lsr & SERIAL_LSR_BI) {
420                 /*
421                  * Parity and Framing errors only count if they
422                  * occur exclusive of a break being
423                  * received.
424                  */
425                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
426         }
427 
428         /* update input line counters */
429         icount = &port->port->icount;
430         if (new_lsr & SERIAL_LSR_BI)
431                 icount->brk++;
432         if (new_lsr & SERIAL_LSR_OE)
433                 icount->overrun++;
434         if (new_lsr & SERIAL_LSR_PE)
435                 icount->parity++;
436         if (new_lsr & SERIAL_LSR_FE)
437                 icount->frame++;
438 }
439 
440 /************************************************************************/
441 /************************************************************************/
442 /*            U S B  C A L L B A C K   F U N C T I O N S                */
443 /*            U S B  C A L L B A C K   F U N C T I O N S                */
444 /************************************************************************/
445 /************************************************************************/
446 
447 static void mos7840_control_callback(struct urb *urb)
448 {
449         unsigned char *data;
450         struct moschip_port *mos7840_port;
451         struct device *dev = &urb->dev->dev;
452         __u8 regval = 0x0;
453         int status = urb->status;
454 
455         mos7840_port = urb->context;
456 
457         switch (status) {
458         case 0:
459                 /* success */
460                 break;
461         case -ECONNRESET:
462         case -ENOENT:
463         case -ESHUTDOWN:
464                 /* this urb is terminated, clean up */
465                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
466                 goto out;
467         default:
468                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
469                 goto out;
470         }
471 
472         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
473         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
474                 mos7840_port->MsrLsr, mos7840_port->port_num);
475         data = urb->transfer_buffer;
476         regval = (__u8) data[0];
477         dev_dbg(dev, "%s data is %x\n", __func__, regval);
478         if (mos7840_port->MsrLsr == 0)
479                 mos7840_handle_new_msr(mos7840_port, regval);
480         else if (mos7840_port->MsrLsr == 1)
481                 mos7840_handle_new_lsr(mos7840_port, regval);
482 out:
483         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
484 }
485 
486 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
487                            __u16 *val)
488 {
489         struct usb_device *dev = mcs->port->serial->dev;
490         struct usb_ctrlrequest *dr = mcs->dr;
491         unsigned char *buffer = mcs->ctrl_buf;
492         int ret;
493 
494         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
495                 return -EBUSY;
496 
497         dr->bRequestType = MCS_RD_RTYPE;
498         dr->bRequest = MCS_RDREQ;
499         dr->wValue = cpu_to_le16(Wval); /* 0 */
500         dr->wIndex = cpu_to_le16(reg);
501         dr->wLength = cpu_to_le16(2);
502 
503         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
504                              (unsigned char *)dr, buffer, 2,
505                              mos7840_control_callback, mcs);
506         mcs->control_urb->transfer_buffer_length = 2;
507         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
508         if (ret)
509                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
510 
511         return ret;
512 }
513 
514 static void mos7840_set_led_callback(struct urb *urb)
515 {
516         switch (urb->status) {
517         case 0:
518                 /* Success */
519                 break;
520         case -ECONNRESET:
521         case -ENOENT:
522         case -ESHUTDOWN:
523                 /* This urb is terminated, clean up */
524                 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
525                         __func__, urb->status);
526                 break;
527         default:
528                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
529                         __func__, urb->status);
530         }
531 }
532 
533 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
534                                 __u16 reg)
535 {
536         struct usb_device *dev = mcs->port->serial->dev;
537         struct usb_ctrlrequest *dr = mcs->led_dr;
538 
539         dr->bRequestType = MCS_WR_RTYPE;
540         dr->bRequest = MCS_WRREQ;
541         dr->wValue = cpu_to_le16(wval);
542         dr->wIndex = cpu_to_le16(reg);
543         dr->wLength = cpu_to_le16(0);
544 
545         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
546                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
547 
548         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
549 }
550 
551 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
552                                 __u16 val)
553 {
554         struct usb_device *dev = port->serial->dev;
555 
556         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
557                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
558 }
559 
560 static void mos7840_led_off(unsigned long arg)
561 {
562         struct moschip_port *mcs = (struct moschip_port *) arg;
563 
564         /* Turn off LED */
565         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
566         mod_timer(&mcs->led_timer2,
567                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
568 }
569 
570 static void mos7840_led_flag_off(unsigned long arg)
571 {
572         struct moschip_port *mcs = (struct moschip_port *) arg;
573 
574         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
575 }
576 
577 static void mos7840_led_activity(struct usb_serial_port *port)
578 {
579         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
580 
581         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
582                 return;
583 
584         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
585         mod_timer(&mos7840_port->led_timer1,
586                                 jiffies + msecs_to_jiffies(LED_ON_MS));
587 }
588 
589 /*****************************************************************************
590  * mos7840_interrupt_callback
591  *      this is the callback function for when we have received data on the
592  *      interrupt endpoint.
593  *****************************************************************************/
594 
595 static void mos7840_interrupt_callback(struct urb *urb)
596 {
597         int result;
598         int length;
599         struct moschip_port *mos7840_port;
600         struct usb_serial *serial;
601         __u16 Data;
602         unsigned char *data;
603         __u8 sp[5], st;
604         int i, rv = 0;
605         __u16 wval, wreg = 0;
606         int status = urb->status;
607 
608         switch (status) {
609         case 0:
610                 /* success */
611                 break;
612         case -ECONNRESET:
613         case -ENOENT:
614         case -ESHUTDOWN:
615                 /* this urb is terminated, clean up */
616                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
617                         __func__, status);
618                 return;
619         default:
620                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
621                         __func__, status);
622                 goto exit;
623         }
624 
625         length = urb->actual_length;
626         data = urb->transfer_buffer;
627 
628         serial = urb->context;
629 
630         /* Moschip get 5 bytes
631          * Byte 1 IIR Port 1 (port.number is 0)
632          * Byte 2 IIR Port 2 (port.number is 1)
633          * Byte 3 IIR Port 3 (port.number is 2)
634          * Byte 4 IIR Port 4 (port.number is 3)
635          * Byte 5 FIFO status for both */
636 
637         if (length > 5) {
638                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
639                 return;
640         }
641 
642         sp[0] = (__u8) data[0];
643         sp[1] = (__u8) data[1];
644         sp[2] = (__u8) data[2];
645         sp[3] = (__u8) data[3];
646         st = (__u8) data[4];
647 
648         for (i = 0; i < serial->num_ports; i++) {
649                 mos7840_port = mos7840_get_port_private(serial->port[i]);
650                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
651                 if (mos7840_port->open) {
652                         if (sp[i] & 0x01) {
653                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
654                         } else {
655                                 switch (sp[i] & 0x0f) {
656                                 case SERIAL_IIR_RLS:
657                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
658                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
659                                         mos7840_port->MsrLsr = 1;
660                                         wreg = LINE_STATUS_REGISTER;
661                                         break;
662                                 case SERIAL_IIR_MS:
663                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
664                                         mos7840_port->MsrLsr = 0;
665                                         wreg = MODEM_STATUS_REGISTER;
666                                         break;
667                                 }
668                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
669                         }
670                 }
671         }
672         if (!(rv < 0))
673                 /* the completion handler for the control urb will resubmit */
674                 return;
675 exit:
676         result = usb_submit_urb(urb, GFP_ATOMIC);
677         if (result) {
678                 dev_err(&urb->dev->dev,
679                         "%s - Error %d submitting interrupt urb\n",
680                         __func__, result);
681         }
682 }
683 
684 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
685                                        const char *function)
686 {
687         if (!port) {
688                 pr_debug("%s - port == NULL\n", function);
689                 return -1;
690         }
691         if (!port->serial) {
692                 pr_debug("%s - port->serial == NULL\n", function);
693                 return -1;
694         }
695 
696         return 0;
697 }
698 
699 /* Inline functions to check the sanity of a pointer that is passed to us */
700 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
701                                          const char *function)
702 {
703         if (!serial) {
704                 pr_debug("%s - serial == NULL\n", function);
705                 return -1;
706         }
707         if (!serial->type) {
708                 pr_debug("%s - serial->type == NULL!\n", function);
709                 return -1;
710         }
711 
712         return 0;
713 }
714 
715 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
716                                                  const char *function)
717 {
718         /* if no port was specified, or it fails a paranoia check */
719         if (!port ||
720             mos7840_port_paranoia_check(port, function) ||
721             mos7840_serial_paranoia_check(port->serial, function)) {
722                 /* then say that we don't have a valid usb_serial thing,
723                  * which will end up genrating -ENODEV return values */
724                 return NULL;
725         }
726 
727         return port->serial;
728 }
729 
730 /*****************************************************************************
731  * mos7840_bulk_in_callback
732  *      this is the callback function for when we have received data on the
733  *      bulk in endpoint.
734  *****************************************************************************/
735 
736 static void mos7840_bulk_in_callback(struct urb *urb)
737 {
738         int retval;
739         unsigned char *data;
740         struct usb_serial *serial;
741         struct usb_serial_port *port;
742         struct moschip_port *mos7840_port;
743         int status = urb->status;
744 
745         mos7840_port = urb->context;
746         if (!mos7840_port)
747                 return;
748 
749         if (status) {
750                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
751                 mos7840_port->read_urb_busy = false;
752                 return;
753         }
754 
755         port = mos7840_port->port;
756         if (mos7840_port_paranoia_check(port, __func__)) {
757                 mos7840_port->read_urb_busy = false;
758                 return;
759         }
760 
761         serial = mos7840_get_usb_serial(port, __func__);
762         if (!serial) {
763                 mos7840_port->read_urb_busy = false;
764                 return;
765         }
766 
767         data = urb->transfer_buffer;
768         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
769 
770         if (urb->actual_length) {
771                 struct tty_port *tport = &mos7840_port->port->port;
772                 tty_insert_flip_string(tport, data, urb->actual_length);
773                 tty_flip_buffer_push(tport);
774                 port->icount.rx += urb->actual_length;
775                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
776         }
777 
778         if (!mos7840_port->read_urb) {
779                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
780                 mos7840_port->read_urb_busy = false;
781                 return;
782         }
783 
784         if (mos7840_port->has_led)
785                 mos7840_led_activity(port);
786 
787         mos7840_port->read_urb_busy = true;
788         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
789 
790         if (retval) {
791                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
792                 mos7840_port->read_urb_busy = false;
793         }
794 }
795 
796 /*****************************************************************************
797  * mos7840_bulk_out_data_callback
798  *      this is the callback function for when we have finished sending
799  *      serial data on the bulk out endpoint.
800  *****************************************************************************/
801 
802 static void mos7840_bulk_out_data_callback(struct urb *urb)
803 {
804         struct moschip_port *mos7840_port;
805         struct usb_serial_port *port;
806         int status = urb->status;
807         int i;
808 
809         mos7840_port = urb->context;
810         port = mos7840_port->port;
811         spin_lock(&mos7840_port->pool_lock);
812         for (i = 0; i < NUM_URBS; i++) {
813                 if (urb == mos7840_port->write_urb_pool[i]) {
814                         mos7840_port->busy[i] = 0;
815                         break;
816                 }
817         }
818         spin_unlock(&mos7840_port->pool_lock);
819 
820         if (status) {
821                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
822                 return;
823         }
824 
825         if (mos7840_port_paranoia_check(port, __func__))
826                 return;
827 
828         if (mos7840_port->open)
829                 tty_port_tty_wakeup(&port->port);
830 
831 }
832 
833 /************************************************************************/
834 /*       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       */
835 /************************************************************************/
836 
837 /*****************************************************************************
838  * mos7840_open
839  *      this function is called by the tty driver when a port is opened
840  *      If successful, we return 0
841  *      Otherwise we return a negative error number.
842  *****************************************************************************/
843 
844 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
845 {
846         int response;
847         int j;
848         struct usb_serial *serial;
849         struct urb *urb;
850         __u16 Data;
851         int status;
852         struct moschip_port *mos7840_port;
853         struct moschip_port *port0;
854 
855         if (mos7840_port_paranoia_check(port, __func__))
856                 return -ENODEV;
857 
858         serial = port->serial;
859 
860         if (mos7840_serial_paranoia_check(serial, __func__))
861                 return -ENODEV;
862 
863         mos7840_port = mos7840_get_port_private(port);
864         port0 = mos7840_get_port_private(serial->port[0]);
865 
866         if (mos7840_port == NULL || port0 == NULL)
867                 return -ENODEV;
868 
869         usb_clear_halt(serial->dev, port->write_urb->pipe);
870         usb_clear_halt(serial->dev, port->read_urb->pipe);
871         port0->open_ports++;
872 
873         /* Initialising the write urb pool */
874         for (j = 0; j < NUM_URBS; ++j) {
875                 urb = usb_alloc_urb(0, GFP_KERNEL);
876                 mos7840_port->write_urb_pool[j] = urb;
877                 if (!urb)
878                         continue;
879 
880                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
881                                                                 GFP_KERNEL);
882                 if (!urb->transfer_buffer) {
883                         usb_free_urb(urb);
884                         mos7840_port->write_urb_pool[j] = NULL;
885                         continue;
886                 }
887         }
888 
889 /*****************************************************************************
890  * Initialize MCS7840 -- Write Init values to corresponding Registers
891  *
892  * Register Index
893  * 1 : IER
894  * 2 : FCR
895  * 3 : LCR
896  * 4 : MCR
897  *
898  * 0x08 : SP1/2 Control Reg
899  *****************************************************************************/
900 
901         /* NEED to check the following Block */
902 
903         Data = 0x0;
904         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
905         if (status < 0) {
906                 dev_dbg(&port->dev, "Reading Spreg failed\n");
907                 goto err;
908         }
909         Data |= 0x80;
910         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
911         if (status < 0) {
912                 dev_dbg(&port->dev, "writing Spreg failed\n");
913                 goto err;
914         }
915 
916         Data &= ~0x80;
917         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
918         if (status < 0) {
919                 dev_dbg(&port->dev, "writing Spreg failed\n");
920                 goto err;
921         }
922         /* End of block to be checked */
923 
924         Data = 0x0;
925         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
926                                                                         &Data);
927         if (status < 0) {
928                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
929                 goto err;
930         }
931         Data |= 0x08;           /* Driver done bit */
932         Data |= 0x20;           /* rx_disable */
933         status = mos7840_set_reg_sync(port,
934                                 mos7840_port->ControlRegOffset, Data);
935         if (status < 0) {
936                 dev_dbg(&port->dev, "writing Controlreg failed\n");
937                 goto err;
938         }
939         /* do register settings here */
940         /* Set all regs to the device default values. */
941         /***********************************
942          * First Disable all interrupts.
943          ***********************************/
944         Data = 0x00;
945         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
946         if (status < 0) {
947                 dev_dbg(&port->dev, "disabling interrupts failed\n");
948                 goto err;
949         }
950         /* Set FIFO_CONTROL_REGISTER to the default value */
951         Data = 0x00;
952         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
953         if (status < 0) {
954                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
955                 goto err;
956         }
957 
958         Data = 0xcf;
959         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
960         if (status < 0) {
961                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
962                 goto err;
963         }
964 
965         Data = 0x03;
966         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
967         mos7840_port->shadowLCR = Data;
968 
969         Data = 0x0b;
970         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
971         mos7840_port->shadowMCR = Data;
972 
973         Data = 0x00;
974         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
975         mos7840_port->shadowLCR = Data;
976 
977         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
978         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
979 
980         Data = 0x0c;
981         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
982 
983         Data = 0x0;
984         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
985 
986         Data = 0x00;
987         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
988 
989         Data = Data & ~SERIAL_LCR_DLAB;
990         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
991         mos7840_port->shadowLCR = Data;
992 
993         /* clearing Bulkin and Bulkout Fifo */
994         Data = 0x0;
995         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
996 
997         Data = Data | 0x0c;
998         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
999 
1000         Data = Data & ~0x0c;
1001         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1002         /* Finally enable all interrupts */
1003         Data = 0x0c;
1004         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1005 
1006         /* clearing rx_disable */
1007         Data = 0x0;
1008         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1009                                                                         &Data);
1010         Data = Data & ~0x20;
1011         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1012                                                                         Data);
1013 
1014         /* rx_negate */
1015         Data = 0x0;
1016         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1017                                                                         &Data);
1018         Data = Data | 0x10;
1019         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1020                                                                         Data);
1021 
1022         /* Check to see if we've set up our endpoint info yet    *
1023          * (can't set it up in mos7840_startup as the structures *
1024          * were not set up at that time.)                        */
1025         if (port0->open_ports == 1) {
1026                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1027                         /* set up interrupt urb */
1028                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1029                                 serial->dev,
1030                                 usb_rcvintpipe(serial->dev,
1031                                 serial->port[0]->interrupt_in_endpointAddress),
1032                                 serial->port[0]->interrupt_in_buffer,
1033                                 serial->port[0]->interrupt_in_urb->
1034                                 transfer_buffer_length,
1035                                 mos7840_interrupt_callback,
1036                                 serial,
1037                                 serial->port[0]->interrupt_in_urb->interval);
1038 
1039                         /* start interrupt read for mos7840 */
1040                         response =
1041                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1042                                            GFP_KERNEL);
1043                         if (response) {
1044                                 dev_err(&port->dev, "%s - Error %d submitting "
1045                                         "interrupt urb\n", __func__, response);
1046                         }
1047 
1048                 }
1049 
1050         }
1051 
1052         /* see if we've set up our endpoint info yet   *
1053          * (can't set it up in mos7840_startup as the  *
1054          * structures were not set up at that time.)   */
1055 
1056         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1057         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1058         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1059         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1060         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1061         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1062         mos7840_port->read_urb = port->read_urb;
1063 
1064         /* set up our bulk in urb */
1065         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1066                 usb_fill_bulk_urb(mos7840_port->read_urb,
1067                         serial->dev,
1068                         usb_rcvbulkpipe(serial->dev,
1069                                 (port->bulk_in_endpointAddress) + 2),
1070                         port->bulk_in_buffer,
1071                         mos7840_port->read_urb->transfer_buffer_length,
1072                         mos7840_bulk_in_callback, mos7840_port);
1073         } else {
1074                 usb_fill_bulk_urb(mos7840_port->read_urb,
1075                         serial->dev,
1076                         usb_rcvbulkpipe(serial->dev,
1077                                 port->bulk_in_endpointAddress),
1078                         port->bulk_in_buffer,
1079                         mos7840_port->read_urb->transfer_buffer_length,
1080                         mos7840_bulk_in_callback, mos7840_port);
1081         }
1082 
1083         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1084         mos7840_port->read_urb_busy = true;
1085         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1086         if (response) {
1087                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1088                         __func__, response);
1089                 mos7840_port->read_urb_busy = false;
1090         }
1091 
1092         /* initialize our port settings */
1093         /* Must set to enable ints! */
1094         mos7840_port->shadowMCR = MCR_MASTER_IE;
1095         /* send a open port command */
1096         mos7840_port->open = 1;
1097         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1098 
1099         return 0;
1100 err:
1101         for (j = 0; j < NUM_URBS; ++j) {
1102                 urb = mos7840_port->write_urb_pool[j];
1103                 if (!urb)
1104                         continue;
1105                 kfree(urb->transfer_buffer);
1106                 usb_free_urb(urb);
1107         }
1108         return status;
1109 }
1110 
1111 /*****************************************************************************
1112  * mos7840_chars_in_buffer
1113  *      this function is called by the tty driver when it wants to know how many
1114  *      bytes of data we currently have outstanding in the port (data that has
1115  *      been written, but hasn't made it out the port yet)
1116  *      If successful, we return the number of bytes left to be written in the
1117  *      system,
1118  *      Otherwise we return zero.
1119  *****************************************************************************/
1120 
1121 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1122 {
1123         struct usb_serial_port *port = tty->driver_data;
1124         int i;
1125         int chars = 0;
1126         unsigned long flags;
1127         struct moschip_port *mos7840_port;
1128 
1129         if (mos7840_port_paranoia_check(port, __func__))
1130                 return 0;
1131 
1132         mos7840_port = mos7840_get_port_private(port);
1133         if (mos7840_port == NULL)
1134                 return 0;
1135 
1136         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1137         for (i = 0; i < NUM_URBS; ++i) {
1138                 if (mos7840_port->busy[i]) {
1139                         struct urb *urb = mos7840_port->write_urb_pool[i];
1140                         chars += urb->transfer_buffer_length;
1141                 }
1142         }
1143         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1144         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1145         return chars;
1146 
1147 }
1148 
1149 /*****************************************************************************
1150  * mos7840_close
1151  *      this function is called by the tty driver when a port is closed
1152  *****************************************************************************/
1153 
1154 static void mos7840_close(struct usb_serial_port *port)
1155 {
1156         struct usb_serial *serial;
1157         struct moschip_port *mos7840_port;
1158         struct moschip_port *port0;
1159         int j;
1160         __u16 Data;
1161 
1162         if (mos7840_port_paranoia_check(port, __func__))
1163                 return;
1164 
1165         serial = mos7840_get_usb_serial(port, __func__);
1166         if (!serial)
1167                 return;
1168 
1169         mos7840_port = mos7840_get_port_private(port);
1170         port0 = mos7840_get_port_private(serial->port[0]);
1171 
1172         if (mos7840_port == NULL || port0 == NULL)
1173                 return;
1174 
1175         for (j = 0; j < NUM_URBS; ++j)
1176                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1177 
1178         /* Freeing Write URBs */
1179         for (j = 0; j < NUM_URBS; ++j) {
1180                 if (mos7840_port->write_urb_pool[j]) {
1181                         kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1182                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1183                 }
1184         }
1185 
1186         usb_kill_urb(mos7840_port->read_urb);
1187         mos7840_port->read_urb_busy = false;
1188 
1189         port0->open_ports--;
1190         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1191         if (port0->open_ports == 0) {
1192                 if (serial->port[0]->interrupt_in_urb) {
1193                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1194                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1195                 }
1196         }
1197 
1198         Data = 0x0;
1199         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1200 
1201         Data = 0x00;
1202         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1203 
1204         mos7840_port->open = 0;
1205 }
1206 
1207 /*****************************************************************************
1208  * mos7840_break
1209  *      this function sends a break to the port
1210  *****************************************************************************/
1211 static void mos7840_break(struct tty_struct *tty, int break_state)
1212 {
1213         struct usb_serial_port *port = tty->driver_data;
1214         unsigned char data;
1215         struct usb_serial *serial;
1216         struct moschip_port *mos7840_port;
1217 
1218         if (mos7840_port_paranoia_check(port, __func__))
1219                 return;
1220 
1221         serial = mos7840_get_usb_serial(port, __func__);
1222         if (!serial)
1223                 return;
1224 
1225         mos7840_port = mos7840_get_port_private(port);
1226 
1227         if (mos7840_port == NULL)
1228                 return;
1229 
1230         if (break_state == -1)
1231                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1232         else
1233                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1234 
1235         /* FIXME: no locking on shadowLCR anywhere in driver */
1236         mos7840_port->shadowLCR = data;
1237         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1238         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1239                              mos7840_port->shadowLCR);
1240 }
1241 
1242 /*****************************************************************************
1243  * mos7840_write_room
1244  *      this function is called by the tty driver when it wants to know how many
1245  *      bytes of data we can accept for a specific port.
1246  *      If successful, we return the amount of room that we have for this port
1247  *      Otherwise we return a negative error number.
1248  *****************************************************************************/
1249 
1250 static int mos7840_write_room(struct tty_struct *tty)
1251 {
1252         struct usb_serial_port *port = tty->driver_data;
1253         int i;
1254         int room = 0;
1255         unsigned long flags;
1256         struct moschip_port *mos7840_port;
1257 
1258         if (mos7840_port_paranoia_check(port, __func__))
1259                 return -1;
1260 
1261         mos7840_port = mos7840_get_port_private(port);
1262         if (mos7840_port == NULL)
1263                 return -1;
1264 
1265         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1266         for (i = 0; i < NUM_URBS; ++i) {
1267                 if (!mos7840_port->busy[i])
1268                         room += URB_TRANSFER_BUFFER_SIZE;
1269         }
1270         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1271 
1272         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1273         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1274         return room;
1275 
1276 }
1277 
1278 /*****************************************************************************
1279  * mos7840_write
1280  *      this function is called by the tty driver when data should be written to
1281  *      the port.
1282  *      If successful, we return the number of bytes written, otherwise we
1283  *      return a negative error number.
1284  *****************************************************************************/
1285 
1286 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1287                          const unsigned char *data, int count)
1288 {
1289         int status;
1290         int i;
1291         int bytes_sent = 0;
1292         int transfer_size;
1293         unsigned long flags;
1294 
1295         struct moschip_port *mos7840_port;
1296         struct usb_serial *serial;
1297         struct urb *urb;
1298         /* __u16 Data; */
1299         const unsigned char *current_position = data;
1300         unsigned char *data1;
1301 
1302         if (mos7840_port_paranoia_check(port, __func__))
1303                 return -1;
1304 
1305         serial = port->serial;
1306         if (mos7840_serial_paranoia_check(serial, __func__))
1307                 return -1;
1308 
1309         mos7840_port = mos7840_get_port_private(port);
1310         if (mos7840_port == NULL)
1311                 return -1;
1312 
1313         /* try to find a free urb in the list */
1314         urb = NULL;
1315 
1316         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1317         for (i = 0; i < NUM_URBS; ++i) {
1318                 if (!mos7840_port->busy[i]) {
1319                         mos7840_port->busy[i] = 1;
1320                         urb = mos7840_port->write_urb_pool[i];
1321                         dev_dbg(&port->dev, "URB:%d\n", i);
1322                         break;
1323                 }
1324         }
1325         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1326 
1327         if (urb == NULL) {
1328                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1329                 goto exit;
1330         }
1331 
1332         if (urb->transfer_buffer == NULL) {
1333                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1334                                                GFP_ATOMIC);
1335                 if (!urb->transfer_buffer)
1336                         goto exit;
1337         }
1338         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1339 
1340         memcpy(urb->transfer_buffer, current_position, transfer_size);
1341 
1342         /* fill urb with data and submit  */
1343         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1344                 usb_fill_bulk_urb(urb,
1345                         serial->dev,
1346                         usb_sndbulkpipe(serial->dev,
1347                                 (port->bulk_out_endpointAddress) + 2),
1348                         urb->transfer_buffer,
1349                         transfer_size,
1350                         mos7840_bulk_out_data_callback, mos7840_port);
1351         } else {
1352                 usb_fill_bulk_urb(urb,
1353                         serial->dev,
1354                         usb_sndbulkpipe(serial->dev,
1355                                 port->bulk_out_endpointAddress),
1356                         urb->transfer_buffer,
1357                         transfer_size,
1358                         mos7840_bulk_out_data_callback, mos7840_port);
1359         }
1360 
1361         data1 = urb->transfer_buffer;
1362         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1363 
1364         if (mos7840_port->has_led)
1365                 mos7840_led_activity(port);
1366 
1367         /* send it down the pipe */
1368         status = usb_submit_urb(urb, GFP_ATOMIC);
1369 
1370         if (status) {
1371                 mos7840_port->busy[i] = 0;
1372                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1373                         "with status = %d\n", __func__, status);
1374                 bytes_sent = status;
1375                 goto exit;
1376         }
1377         bytes_sent = transfer_size;
1378         port->icount.tx += transfer_size;
1379         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1380 exit:
1381         return bytes_sent;
1382 
1383 }
1384 
1385 /*****************************************************************************
1386  * mos7840_throttle
1387  *      this function is called by the tty driver when it wants to stop the data
1388  *      being read from the port.
1389  *****************************************************************************/
1390 
1391 static void mos7840_throttle(struct tty_struct *tty)
1392 {
1393         struct usb_serial_port *port = tty->driver_data;
1394         struct moschip_port *mos7840_port;
1395         int status;
1396 
1397         if (mos7840_port_paranoia_check(port, __func__))
1398                 return;
1399 
1400         mos7840_port = mos7840_get_port_private(port);
1401 
1402         if (mos7840_port == NULL)
1403                 return;
1404 
1405         if (!mos7840_port->open) {
1406                 dev_dbg(&port->dev, "%s", "port not opened\n");
1407                 return;
1408         }
1409 
1410         /* if we are implementing XON/XOFF, send the stop character */
1411         if (I_IXOFF(tty)) {
1412                 unsigned char stop_char = STOP_CHAR(tty);
1413                 status = mos7840_write(tty, port, &stop_char, 1);
1414                 if (status <= 0)
1415                         return;
1416         }
1417         /* if we are implementing RTS/CTS, toggle that line */
1418         if (C_CRTSCTS(tty)) {
1419                 mos7840_port->shadowMCR &= ~MCR_RTS;
1420                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1421                                          mos7840_port->shadowMCR);
1422                 if (status < 0)
1423                         return;
1424         }
1425 }
1426 
1427 /*****************************************************************************
1428  * mos7840_unthrottle
1429  *      this function is called by the tty driver when it wants to resume
1430  *      the data being read from the port (called after mos7840_throttle is
1431  *      called)
1432  *****************************************************************************/
1433 static void mos7840_unthrottle(struct tty_struct *tty)
1434 {
1435         struct usb_serial_port *port = tty->driver_data;
1436         int status;
1437         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1438 
1439         if (mos7840_port_paranoia_check(port, __func__))
1440                 return;
1441 
1442         if (mos7840_port == NULL)
1443                 return;
1444 
1445         if (!mos7840_port->open) {
1446                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1447                 return;
1448         }
1449 
1450         /* if we are implementing XON/XOFF, send the start character */
1451         if (I_IXOFF(tty)) {
1452                 unsigned char start_char = START_CHAR(tty);
1453                 status = mos7840_write(tty, port, &start_char, 1);
1454                 if (status <= 0)
1455                         return;
1456         }
1457 
1458         /* if we are implementing RTS/CTS, toggle that line */
1459         if (C_CRTSCTS(tty)) {
1460                 mos7840_port->shadowMCR |= MCR_RTS;
1461                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1462                                          mos7840_port->shadowMCR);
1463                 if (status < 0)
1464                         return;
1465         }
1466 }
1467 
1468 static int mos7840_tiocmget(struct tty_struct *tty)
1469 {
1470         struct usb_serial_port *port = tty->driver_data;
1471         struct moschip_port *mos7840_port;
1472         unsigned int result;
1473         __u16 msr;
1474         __u16 mcr;
1475         int status;
1476         mos7840_port = mos7840_get_port_private(port);
1477 
1478         if (mos7840_port == NULL)
1479                 return -ENODEV;
1480 
1481         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1482         if (status != 1)
1483                 return -EIO;
1484         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1485         if (status != 1)
1486                 return -EIO;
1487         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1488             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1489             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1490             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1491             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1492             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1493             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1494 
1495         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1496 
1497         return result;
1498 }
1499 
1500 static int mos7840_tiocmset(struct tty_struct *tty,
1501                             unsigned int set, unsigned int clear)
1502 {
1503         struct usb_serial_port *port = tty->driver_data;
1504         struct moschip_port *mos7840_port;
1505         unsigned int mcr;
1506         int status;
1507 
1508         mos7840_port = mos7840_get_port_private(port);
1509 
1510         if (mos7840_port == NULL)
1511                 return -ENODEV;
1512 
1513         /* FIXME: What locks the port registers ? */
1514         mcr = mos7840_port->shadowMCR;
1515         if (clear & TIOCM_RTS)
1516                 mcr &= ~MCR_RTS;
1517         if (clear & TIOCM_DTR)
1518                 mcr &= ~MCR_DTR;
1519         if (clear & TIOCM_LOOP)
1520                 mcr &= ~MCR_LOOPBACK;
1521 
1522         if (set & TIOCM_RTS)
1523                 mcr |= MCR_RTS;
1524         if (set & TIOCM_DTR)
1525                 mcr |= MCR_DTR;
1526         if (set & TIOCM_LOOP)
1527                 mcr |= MCR_LOOPBACK;
1528 
1529         mos7840_port->shadowMCR = mcr;
1530 
1531         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1532         if (status < 0) {
1533                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1534                 return status;
1535         }
1536 
1537         return 0;
1538 }
1539 
1540 /*****************************************************************************
1541  * mos7840_calc_baud_rate_divisor
1542  *      this function calculates the proper baud rate divisor for the specified
1543  *      baud rate.
1544  *****************************************************************************/
1545 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1546                                           int baudRate, int *divisor,
1547                                           __u16 *clk_sel_val)
1548 {
1549         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1550 
1551         if (baudRate <= 115200) {
1552                 *divisor = 115200 / baudRate;
1553                 *clk_sel_val = 0x0;
1554         }
1555         if ((baudRate > 115200) && (baudRate <= 230400)) {
1556                 *divisor = 230400 / baudRate;
1557                 *clk_sel_val = 0x10;
1558         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1559                 *divisor = 403200 / baudRate;
1560                 *clk_sel_val = 0x20;
1561         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1562                 *divisor = 460800 / baudRate;
1563                 *clk_sel_val = 0x30;
1564         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1565                 *divisor = 806400 / baudRate;
1566                 *clk_sel_val = 0x40;
1567         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1568                 *divisor = 921600 / baudRate;
1569                 *clk_sel_val = 0x50;
1570         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1571                 *divisor = 1572864 / baudRate;
1572                 *clk_sel_val = 0x60;
1573         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1574                 *divisor = 3145728 / baudRate;
1575                 *clk_sel_val = 0x70;
1576         }
1577         return 0;
1578 }
1579 
1580 /*****************************************************************************
1581  * mos7840_send_cmd_write_baud_rate
1582  *      this function sends the proper command to change the baud rate of the
1583  *      specified port.
1584  *****************************************************************************/
1585 
1586 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1587                                             int baudRate)
1588 {
1589         int divisor = 0;
1590         int status;
1591         __u16 Data;
1592         unsigned char number;
1593         __u16 clk_sel_val;
1594         struct usb_serial_port *port;
1595 
1596         if (mos7840_port == NULL)
1597                 return -1;
1598 
1599         port = mos7840_port->port;
1600         if (mos7840_port_paranoia_check(port, __func__))
1601                 return -1;
1602 
1603         if (mos7840_serial_paranoia_check(port->serial, __func__))
1604                 return -1;
1605 
1606         number = mos7840_port->port->port_number;
1607 
1608         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1609         /* reset clk_uart_sel in spregOffset */
1610         if (baudRate > 115200) {
1611 #ifdef HW_flow_control
1612                 /* NOTE: need to see the pther register to modify */
1613                 /* setting h/w flow control bit to 1 */
1614                 Data = 0x2b;
1615                 mos7840_port->shadowMCR = Data;
1616                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1617                                                                         Data);
1618                 if (status < 0) {
1619                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1620                         return -1;
1621                 }
1622 #endif
1623 
1624         } else {
1625 #ifdef HW_flow_control
1626                 /* setting h/w flow control bit to 0 */
1627                 Data = 0xb;
1628                 mos7840_port->shadowMCR = Data;
1629                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1630                                                                         Data);
1631                 if (status < 0) {
1632                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1633                         return -1;
1634                 }
1635 #endif
1636 
1637         }
1638 
1639         if (1) {                /* baudRate <= 115200) */
1640                 clk_sel_val = 0x0;
1641                 Data = 0x0;
1642                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1643                                                    &clk_sel_val);
1644                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1645                                                                  &Data);
1646                 if (status < 0) {
1647                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1648                         return -1;
1649                 }
1650                 Data = (Data & 0x8f) | clk_sel_val;
1651                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1652                                                                 Data);
1653                 if (status < 0) {
1654                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1655                         return -1;
1656                 }
1657                 /* Calculate the Divisor */
1658 
1659                 if (status) {
1660                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1661                         return status;
1662                 }
1663                 /* Enable access to divisor latch */
1664                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1665                 mos7840_port->shadowLCR = Data;
1666                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1667 
1668                 /* Write the divisor */
1669                 Data = (unsigned char)(divisor & 0xff);
1670                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1671                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1672 
1673                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1674                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1675                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1676 
1677                 /* Disable access to divisor latch */
1678                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1679                 mos7840_port->shadowLCR = Data;
1680                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1681 
1682         }
1683         return status;
1684 }
1685 
1686 /*****************************************************************************
1687  * mos7840_change_port_settings
1688  *      This routine is called to set the UART on the device to match
1689  *      the specified new settings.
1690  *****************************************************************************/
1691 
1692 static void mos7840_change_port_settings(struct tty_struct *tty,
1693         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1694 {
1695         int baud;
1696         unsigned cflag;
1697         unsigned iflag;
1698         __u8 lData;
1699         __u8 lParity;
1700         __u8 lStop;
1701         int status;
1702         __u16 Data;
1703         struct usb_serial_port *port;
1704         struct usb_serial *serial;
1705 
1706         if (mos7840_port == NULL)
1707                 return;
1708 
1709         port = mos7840_port->port;
1710 
1711         if (mos7840_port_paranoia_check(port, __func__))
1712                 return;
1713 
1714         if (mos7840_serial_paranoia_check(port->serial, __func__))
1715                 return;
1716 
1717         serial = port->serial;
1718 
1719         if (!mos7840_port->open) {
1720                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1721                 return;
1722         }
1723 
1724         lData = LCR_BITS_8;
1725         lStop = LCR_STOP_1;
1726         lParity = LCR_PAR_NONE;
1727 
1728         cflag = tty->termios.c_cflag;
1729         iflag = tty->termios.c_iflag;
1730 
1731         /* Change the number of bits */
1732         switch (cflag & CSIZE) {
1733         case CS5:
1734                 lData = LCR_BITS_5;
1735                 break;
1736 
1737         case CS6:
1738                 lData = LCR_BITS_6;
1739                 break;
1740 
1741         case CS7:
1742                 lData = LCR_BITS_7;
1743                 break;
1744 
1745         default:
1746         case CS8:
1747                 lData = LCR_BITS_8;
1748                 break;
1749         }
1750 
1751         /* Change the Parity bit */
1752         if (cflag & PARENB) {
1753                 if (cflag & PARODD) {
1754                         lParity = LCR_PAR_ODD;
1755                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1756                 } else {
1757                         lParity = LCR_PAR_EVEN;
1758                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1759                 }
1760 
1761         } else {
1762                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1763         }
1764 
1765         if (cflag & CMSPAR)
1766                 lParity = lParity | 0x20;
1767 
1768         /* Change the Stop bit */
1769         if (cflag & CSTOPB) {
1770                 lStop = LCR_STOP_2;
1771                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1772         } else {
1773                 lStop = LCR_STOP_1;
1774                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1775         }
1776 
1777         /* Update the LCR with the correct value */
1778         mos7840_port->shadowLCR &=
1779             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1780         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1781 
1782         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1783                 mos7840_port->shadowLCR);
1784         /* Disable Interrupts */
1785         Data = 0x00;
1786         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1787 
1788         Data = 0x00;
1789         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1790 
1791         Data = 0xcf;
1792         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1793 
1794         /* Send the updated LCR value to the mos7840 */
1795         Data = mos7840_port->shadowLCR;
1796 
1797         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1798 
1799         Data = 0x00b;
1800         mos7840_port->shadowMCR = Data;
1801         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1802         Data = 0x00b;
1803         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1804 
1805         /* set up the MCR register and send it to the mos7840 */
1806 
1807         mos7840_port->shadowMCR = MCR_MASTER_IE;
1808         if (cflag & CBAUD)
1809                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1810 
1811         if (cflag & CRTSCTS)
1812                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1813         else
1814                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1815 
1816         Data = mos7840_port->shadowMCR;
1817         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1818 
1819         /* Determine divisor based on baud rate */
1820         baud = tty_get_baud_rate(tty);
1821 
1822         if (!baud) {
1823                 /* pick a default, any default... */
1824                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1825                 baud = 9600;
1826         }
1827 
1828         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1829         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1830 
1831         /* Enable Interrupts */
1832         Data = 0x0c;
1833         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1834 
1835         if (!mos7840_port->read_urb_busy) {
1836                 mos7840_port->read_urb_busy = true;
1837                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1838                 if (status) {
1839                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1840                             status);
1841                         mos7840_port->read_urb_busy = false;
1842                 }
1843         }
1844         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1845                 mos7840_port->shadowLCR);
1846 }
1847 
1848 /*****************************************************************************
1849  * mos7840_set_termios
1850  *      this function is called by the tty driver when it wants to change
1851  *      the termios structure
1852  *****************************************************************************/
1853 
1854 static void mos7840_set_termios(struct tty_struct *tty,
1855                                 struct usb_serial_port *port,
1856                                 struct ktermios *old_termios)
1857 {
1858         int status;
1859         unsigned int cflag;
1860         struct usb_serial *serial;
1861         struct moschip_port *mos7840_port;
1862 
1863         if (mos7840_port_paranoia_check(port, __func__))
1864                 return;
1865 
1866         serial = port->serial;
1867 
1868         if (mos7840_serial_paranoia_check(serial, __func__))
1869                 return;
1870 
1871         mos7840_port = mos7840_get_port_private(port);
1872 
1873         if (mos7840_port == NULL)
1874                 return;
1875 
1876         if (!mos7840_port->open) {
1877                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1878                 return;
1879         }
1880 
1881         dev_dbg(&port->dev, "%s", "setting termios - \n");
1882 
1883         cflag = tty->termios.c_cflag;
1884 
1885         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1886                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1887         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1888                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1889 
1890         /* change the port settings to the new ones specified */
1891 
1892         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1893 
1894         if (!mos7840_port->read_urb) {
1895                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1896                 return;
1897         }
1898 
1899         if (!mos7840_port->read_urb_busy) {
1900                 mos7840_port->read_urb_busy = true;
1901                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1902                 if (status) {
1903                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1904                             status);
1905                         mos7840_port->read_urb_busy = false;
1906                 }
1907         }
1908 }
1909 
1910 /*****************************************************************************
1911  * mos7840_get_lsr_info - get line status register info
1912  *
1913  * Purpose: Let user call ioctl() to get info when the UART physically
1914  *          is emptied.  On bus types like RS485, the transmitter must
1915  *          release the bus after transmitting. This must be done when
1916  *          the transmit shift register is empty, not be done when the
1917  *          transmit holding register is empty.  This functionality
1918  *          allows an RS485 driver to be written in user space.
1919  *****************************************************************************/
1920 
1921 static int mos7840_get_lsr_info(struct tty_struct *tty,
1922                                 unsigned int __user *value)
1923 {
1924         int count;
1925         unsigned int result = 0;
1926 
1927         count = mos7840_chars_in_buffer(tty);
1928         if (count == 0)
1929                 result = TIOCSER_TEMT;
1930 
1931         if (copy_to_user(value, &result, sizeof(int)))
1932                 return -EFAULT;
1933         return 0;
1934 }
1935 
1936 /*****************************************************************************
1937  * mos7840_get_serial_info
1938  *      function to get information about serial port
1939  *****************************************************************************/
1940 
1941 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1942                                    struct serial_struct __user *retinfo)
1943 {
1944         struct serial_struct tmp;
1945 
1946         if (mos7840_port == NULL)
1947                 return -1;
1948 
1949         memset(&tmp, 0, sizeof(tmp));
1950 
1951         tmp.type = PORT_16550A;
1952         tmp.line = mos7840_port->port->minor;
1953         tmp.port = mos7840_port->port->port_number;
1954         tmp.irq = 0;
1955         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1956         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1957         tmp.baud_base = 9600;
1958         tmp.close_delay = 5 * HZ;
1959         tmp.closing_wait = 30 * HZ;
1960 
1961         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1962                 return -EFAULT;
1963         return 0;
1964 }
1965 
1966 /*****************************************************************************
1967  * SerialIoctl
1968  *      this function handles any ioctl calls to the driver
1969  *****************************************************************************/
1970 
1971 static int mos7840_ioctl(struct tty_struct *tty,
1972                          unsigned int cmd, unsigned long arg)
1973 {
1974         struct usb_serial_port *port = tty->driver_data;
1975         void __user *argp = (void __user *)arg;
1976         struct moschip_port *mos7840_port;
1977 
1978         if (mos7840_port_paranoia_check(port, __func__))
1979                 return -1;
1980 
1981         mos7840_port = mos7840_get_port_private(port);
1982 
1983         if (mos7840_port == NULL)
1984                 return -1;
1985 
1986         switch (cmd) {
1987                 /* return number of bytes available */
1988 
1989         case TIOCSERGETLSR:
1990                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1991                 return mos7840_get_lsr_info(tty, argp);
1992 
1993         case TIOCGSERIAL:
1994                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
1995                 return mos7840_get_serial_info(mos7840_port, argp);
1996 
1997         case TIOCSSERIAL:
1998                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
1999                 break;
2000         default:
2001                 break;
2002         }
2003         return -ENOIOCTLCMD;
2004 }
2005 
2006 static int mos7810_check(struct usb_serial *serial)
2007 {
2008         int i, pass_count = 0;
2009         u8 *buf;
2010         __u16 data = 0, mcr_data = 0;
2011         __u16 test_pattern = 0x55AA;
2012         int res;
2013 
2014         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2015         if (!buf)
2016                 return 0;       /* failed to identify 7810 */
2017 
2018         /* Store MCR setting */
2019         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2020                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2021                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2022         if (res == VENDOR_READ_LENGTH)
2023                 mcr_data = *buf;
2024 
2025         for (i = 0; i < 16; i++) {
2026                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2027                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2028                         MCS_WRREQ, MCS_WR_RTYPE,
2029                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2030                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2031 
2032                 /* Read the test pattern back */
2033                 res = usb_control_msg(serial->dev,
2034                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2035                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2036                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2037                 if (res == VENDOR_READ_LENGTH)
2038                         data = *buf;
2039 
2040                 /* If this is a MCS7810 device, both test patterns must match */
2041                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2042                         break;
2043 
2044                 pass_count++;
2045         }
2046 
2047         /* Restore MCR setting */
2048         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2049                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2050                 0, MOS_WDR_TIMEOUT);
2051 
2052         kfree(buf);
2053 
2054         if (pass_count == 16)
2055                 return 1;
2056 
2057         return 0;
2058 }
2059 
2060 static int mos7840_probe(struct usb_serial *serial,
2061                                 const struct usb_device_id *id)
2062 {
2063         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2064         u8 *buf;
2065         int device_type;
2066 
2067         if (product == MOSCHIP_DEVICE_ID_7810 ||
2068                 product == MOSCHIP_DEVICE_ID_7820) {
2069                 device_type = product;
2070                 goto out;
2071         }
2072 
2073         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2074         if (!buf)
2075                 return -ENOMEM;
2076 
2077         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2078                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2079                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2080 
2081         /* For a MCS7840 device GPIO0 must be set to 1 */
2082         if (buf[0] & 0x01)
2083                 device_type = MOSCHIP_DEVICE_ID_7840;
2084         else if (mos7810_check(serial))
2085                 device_type = MOSCHIP_DEVICE_ID_7810;
2086         else
2087                 device_type = MOSCHIP_DEVICE_ID_7820;
2088 
2089         kfree(buf);
2090 out:
2091         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2092 
2093         return 0;
2094 }
2095 
2096 static int mos7840_calc_num_ports(struct usb_serial *serial)
2097 {
2098         int device_type = (unsigned long)usb_get_serial_data(serial);
2099         int mos7840_num_ports;
2100 
2101         mos7840_num_ports = (device_type >> 4) & 0x000F;
2102 
2103         return mos7840_num_ports;
2104 }
2105 
2106 static int mos7840_attach(struct usb_serial *serial)
2107 {
2108         if (serial->num_bulk_in < serial->num_ports ||
2109                         serial->num_bulk_out < serial->num_ports) {
2110                 dev_err(&serial->interface->dev, "missing endpoints\n");
2111                 return -ENODEV;
2112         }
2113 
2114         return 0;
2115 }
2116 
2117 static int mos7840_port_probe(struct usb_serial_port *port)
2118 {
2119         struct usb_serial *serial = port->serial;
2120         int device_type = (unsigned long)usb_get_serial_data(serial);
2121         struct moschip_port *mos7840_port;
2122         int status;
2123         int pnum;
2124         __u16 Data;
2125 
2126         /* we set up the pointers to the endpoints in the mos7840_open *
2127          * function, as the structures aren't created yet.             */
2128 
2129         pnum = port->port_number;
2130 
2131         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2132         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2133         if (!mos7840_port)
2134                 return -ENOMEM;
2135 
2136         /* Initialize all port interrupt end point to port 0 int
2137          * endpoint. Our device has only one interrupt end point
2138          * common to all port */
2139 
2140         mos7840_port->port = port;
2141         mos7840_set_port_private(port, mos7840_port);
2142         spin_lock_init(&mos7840_port->pool_lock);
2143 
2144         /* minor is not initialised until later by
2145          * usb-serial.c:get_free_serial() and cannot therefore be used
2146          * to index device instances */
2147         mos7840_port->port_num = pnum + 1;
2148         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2149         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2150 
2151         if (mos7840_port->port_num == 1) {
2152                 mos7840_port->SpRegOffset = 0x0;
2153                 mos7840_port->ControlRegOffset = 0x1;
2154                 mos7840_port->DcrRegOffset = 0x4;
2155         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2156                 mos7840_port->SpRegOffset = 0x8;
2157                 mos7840_port->ControlRegOffset = 0x9;
2158                 mos7840_port->DcrRegOffset = 0x16;
2159         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2160                 mos7840_port->SpRegOffset = 0xa;
2161                 mos7840_port->ControlRegOffset = 0xb;
2162                 mos7840_port->DcrRegOffset = 0x19;
2163         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2164                 mos7840_port->SpRegOffset = 0xa;
2165                 mos7840_port->ControlRegOffset = 0xb;
2166                 mos7840_port->DcrRegOffset = 0x19;
2167         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2168                 mos7840_port->SpRegOffset = 0xc;
2169                 mos7840_port->ControlRegOffset = 0xd;
2170                 mos7840_port->DcrRegOffset = 0x1c;
2171         }
2172         mos7840_dump_serial_port(port, mos7840_port);
2173         mos7840_set_port_private(port, mos7840_port);
2174 
2175         /* enable rx_disable bit in control register */
2176         status = mos7840_get_reg_sync(port,
2177                         mos7840_port->ControlRegOffset, &Data);
2178         if (status < 0) {
2179                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2180                 goto out;
2181         } else
2182                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2183         Data |= 0x08;   /* setting driver done bit */
2184         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2185                            modem status reg */
2186 
2187         /* Data |= 0x20; //rx_disable bit */
2188         status = mos7840_set_reg_sync(port,
2189                         mos7840_port->ControlRegOffset, Data);
2190         if (status < 0) {
2191                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2192                 goto out;
2193         } else
2194                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2195 
2196         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2197            and 0x24 in DCR3 */
2198         Data = 0x01;
2199         status = mos7840_set_reg_sync(port,
2200                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2201         if (status < 0) {
2202                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2203                 goto out;
2204         } else
2205                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2206 
2207         Data = 0x05;
2208         status = mos7840_set_reg_sync(port,
2209                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2210         if (status < 0) {
2211                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2212                 goto out;
2213         } else
2214                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2215 
2216         Data = 0x24;
2217         status = mos7840_set_reg_sync(port,
2218                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2219         if (status < 0) {
2220                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2221                 goto out;
2222         } else
2223                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2224 
2225         /* write values in clkstart0x0 and clkmulti 0x20 */
2226         Data = 0x0;
2227         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2228         if (status < 0) {
2229                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2230                 goto out;
2231         } else
2232                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2233 
2234         Data = 0x20;
2235         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2236         if (status < 0) {
2237                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2238                 goto error;
2239         } else
2240                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2241 
2242         /* write value 0x0 to scratchpad register */
2243         Data = 0x00;
2244         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2245         if (status < 0) {
2246                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2247                 goto out;
2248         } else
2249                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2250 
2251         /* Zero Length flag register */
2252         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2253                 Data = 0xff;
2254                 status = mos7840_set_reg_sync(port,
2255                                 (__u16) (ZLP_REG1 +
2256                                         ((__u16)mos7840_port->port_num)), Data);
2257                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2258                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2259                 if (status < 0) {
2260                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2261                         goto out;
2262                 } else
2263                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2264         } else {
2265                 Data = 0xff;
2266                 status = mos7840_set_reg_sync(port,
2267                                 (__u16) (ZLP_REG1 +
2268                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2269                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2270                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2271                 if (status < 0) {
2272                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2273                         goto out;
2274                 } else
2275                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2276 
2277         }
2278         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2279         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2280         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2281                         GFP_KERNEL);
2282         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2283                         !mos7840_port->dr) {
2284                 status = -ENOMEM;
2285                 goto error;
2286         }
2287 
2288         mos7840_port->has_led = false;
2289 
2290         /* Initialize LED timers */
2291         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2292                 mos7840_port->has_led = true;
2293 
2294                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2295                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2296                                                                 GFP_KERNEL);
2297                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2298                         status = -ENOMEM;
2299                         goto error;
2300                 }
2301 
2302                 setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
2303                             (unsigned long)mos7840_port);
2304                 mos7840_port->led_timer1.expires =
2305                         jiffies + msecs_to_jiffies(LED_ON_MS);
2306                 setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
2307                             (unsigned long)mos7840_port);
2308                 mos7840_port->led_timer2.expires =
2309                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2310 
2311                 /* Turn off LED */
2312                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2313         }
2314 out:
2315         if (pnum == serial->num_ports - 1) {
2316                 /* Zero Length flag enable */
2317                 Data = 0x0f;
2318                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2319                 if (status < 0) {
2320                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2321                         goto error;
2322                 } else
2323                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2324 
2325                 /* setting configuration feature to one */
2326                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2327                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2328                                 MOS_WDR_TIMEOUT);
2329         }
2330         return 0;
2331 error:
2332         kfree(mos7840_port->led_dr);
2333         usb_free_urb(mos7840_port->led_urb);
2334         kfree(mos7840_port->dr);
2335         kfree(mos7840_port->ctrl_buf);
2336         usb_free_urb(mos7840_port->control_urb);
2337         kfree(mos7840_port);
2338 
2339         return status;
2340 }
2341 
2342 static int mos7840_port_remove(struct usb_serial_port *port)
2343 {
2344         struct moschip_port *mos7840_port;
2345 
2346         mos7840_port = mos7840_get_port_private(port);
2347 
2348         if (mos7840_port->has_led) {
2349                 /* Turn off LED */
2350                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2351 
2352                 del_timer_sync(&mos7840_port->led_timer1);
2353                 del_timer_sync(&mos7840_port->led_timer2);
2354 
2355                 usb_kill_urb(mos7840_port->led_urb);
2356                 usb_free_urb(mos7840_port->led_urb);
2357                 kfree(mos7840_port->led_dr);
2358         }
2359         usb_kill_urb(mos7840_port->control_urb);
2360         usb_free_urb(mos7840_port->control_urb);
2361         kfree(mos7840_port->ctrl_buf);
2362         kfree(mos7840_port->dr);
2363         kfree(mos7840_port);
2364 
2365         return 0;
2366 }
2367 
2368 static struct usb_serial_driver moschip7840_4port_device = {
2369         .driver = {
2370                    .owner = THIS_MODULE,
2371                    .name = "mos7840",
2372                    },
2373         .description = DRIVER_DESC,
2374         .id_table = id_table,
2375         .num_ports = 4,
2376         .open = mos7840_open,
2377         .close = mos7840_close,
2378         .write = mos7840_write,
2379         .write_room = mos7840_write_room,
2380         .chars_in_buffer = mos7840_chars_in_buffer,
2381         .throttle = mos7840_throttle,
2382         .unthrottle = mos7840_unthrottle,
2383         .calc_num_ports = mos7840_calc_num_ports,
2384         .probe = mos7840_probe,
2385         .ioctl = mos7840_ioctl,
2386         .set_termios = mos7840_set_termios,
2387         .break_ctl = mos7840_break,
2388         .tiocmget = mos7840_tiocmget,
2389         .tiocmset = mos7840_tiocmset,
2390         .tiocmiwait = usb_serial_generic_tiocmiwait,
2391         .get_icount = usb_serial_generic_get_icount,
2392         .attach = mos7840_attach,
2393         .port_probe = mos7840_port_probe,
2394         .port_remove = mos7840_port_remove,
2395         .read_bulk_callback = mos7840_bulk_in_callback,
2396         .read_int_callback = mos7840_interrupt_callback,
2397 };
2398 
2399 static struct usb_serial_driver * const serial_drivers[] = {
2400         &moschip7840_4port_device, NULL
2401 };
2402 
2403 module_usb_serial_driver(serial_drivers, id_table);
2404 
2405 MODULE_DESCRIPTION(DRIVER_DESC);
2406 MODULE_LICENSE("GPL");
2407 

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