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[mirror_ubuntu-zesty-kernel.git] / 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/init.h>
28 #include <linux/slab.h>
29 #include <linux/smp_lock.h>
30 #include <linux/tty.h>
31 #include <linux/tty_driver.h>
32 #include <linux/tty_flip.h>
33 #include <linux/module.h>
34 #include <linux/serial.h>
35 #include <linux/usb.h>
36 #include <linux/usb/serial.h>
37 #include <linux/uaccess.h>
38
39 /*
40 * Version Information
41 */
42 #define DRIVER_VERSION "1.3.2"
43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
44
45 /*
46 * 16C50 UART register defines
47 */
48
49 #define LCR_BITS_5 0x00 /* 5 bits/char */
50 #define LCR_BITS_6 0x01 /* 6 bits/char */
51 #define LCR_BITS_7 0x02 /* 7 bits/char */
52 #define LCR_BITS_8 0x03 /* 8 bits/char */
53 #define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
54
55 #define LCR_STOP_1 0x00 /* 1 stop bit */
56 #define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
57 #define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
58 #define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
59
60 #define LCR_PAR_NONE 0x00 /* No parity */
61 #define LCR_PAR_ODD 0x08 /* Odd parity */
62 #define LCR_PAR_EVEN 0x18 /* Even parity */
63 #define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
64 #define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
65 #define LCR_PAR_MASK 0x38 /* Mask for parity field */
66
67 #define LCR_SET_BREAK 0x40 /* Set Break condition */
68 #define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
69
70 #define MCR_DTR 0x01 /* Assert DTR */
71 #define MCR_RTS 0x02 /* Assert RTS */
72 #define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
73 #define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
74 #define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
75 #define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
76
77 #define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
78 #define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
79 #define MOS7840_MSR_RI 0x40 /* Current state of RI */
80 #define MOS7840_MSR_CD 0x80 /* Current state of CD */
81
82 /*
83 * Defines used for sending commands to port
84 */
85
86 #define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
87 #define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
88
89 #define MOS_PORT1 0x0200
90 #define MOS_PORT2 0x0300
91 #define MOS_VENREG 0x0000
92 #define MOS_MAX_PORT 0x02
93 #define MOS_WRITE 0x0E
94 #define MOS_READ 0x0D
95
96 /* Requests */
97 #define MCS_RD_RTYPE 0xC0
98 #define MCS_WR_RTYPE 0x40
99 #define MCS_RDREQ 0x0D
100 #define MCS_WRREQ 0x0E
101 #define MCS_CTRL_TIMEOUT 500
102 #define VENDOR_READ_LENGTH (0x01)
103
104 #define MAX_NAME_LEN 64
105
106 #define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
107 #define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
108
109 /* For higher baud Rates use TIOCEXBAUD */
110 #define TIOCEXBAUD 0x5462
111
112 /* vendor id and device id defines */
113
114 /* The native mos7840/7820 component */
115 #define USB_VENDOR_ID_MOSCHIP 0x9710
116 #define MOSCHIP_DEVICE_ID_7840 0x7840
117 #define MOSCHIP_DEVICE_ID_7820 0x7820
118 /* The native component can have its vendor/device id's overridden
119 * in vendor-specific implementations. Such devices can be handled
120 * by making a change here, in moschip_port_id_table, and in
121 * moschip_id_table_combined
122 */
123 #define USB_VENDOR_ID_BANDB 0x0856
124 #define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
125 #define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
126 #define BANDB_DEVICE_ID_US9ML2_2 0xAC29
127 #define BANDB_DEVICE_ID_US9ML2_4 0xAC30
128 #define BANDB_DEVICE_ID_USPTL4_2 0xAC31
129 #define BANDB_DEVICE_ID_USPTL4_4 0xAC32
130 #define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
131 #define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
132
133 /* This driver also supports
134 * ATEN UC2324 device using Moschip MCS7840
135 * ATEN UC2322 device using Moschip MCS7820
136 */
137 #define USB_VENDOR_ID_ATENINTL 0x0557
138 #define ATENINTL_DEVICE_ID_UC2324 0x2011
139 #define ATENINTL_DEVICE_ID_UC2322 0x7820
140
141 /* Interrupt Routine Defines */
142
143 #define SERIAL_IIR_RLS 0x06
144 #define SERIAL_IIR_MS 0x00
145
146 /*
147 * Emulation of the bit mask on the LINE STATUS REGISTER.
148 */
149 #define SERIAL_LSR_DR 0x0001
150 #define SERIAL_LSR_OE 0x0002
151 #define SERIAL_LSR_PE 0x0004
152 #define SERIAL_LSR_FE 0x0008
153 #define SERIAL_LSR_BI 0x0010
154
155 #define MOS_MSR_DELTA_CTS 0x10
156 #define MOS_MSR_DELTA_DSR 0x20
157 #define MOS_MSR_DELTA_RI 0x40
158 #define MOS_MSR_DELTA_CD 0x80
159
160 /* Serial Port register Address */
161 #define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
162 #define FIFO_CONTROL_REGISTER ((__u16)(0x02))
163 #define LINE_CONTROL_REGISTER ((__u16)(0x03))
164 #define MODEM_CONTROL_REGISTER ((__u16)(0x04))
165 #define LINE_STATUS_REGISTER ((__u16)(0x05))
166 #define MODEM_STATUS_REGISTER ((__u16)(0x06))
167 #define SCRATCH_PAD_REGISTER ((__u16)(0x07))
168 #define DIVISOR_LATCH_LSB ((__u16)(0x00))
169 #define DIVISOR_LATCH_MSB ((__u16)(0x01))
170
171 #define CLK_MULTI_REGISTER ((__u16)(0x02))
172 #define CLK_START_VALUE_REGISTER ((__u16)(0x03))
173
174 #define SERIAL_LCR_DLAB ((__u16)(0x0080))
175
176 /*
177 * URB POOL related defines
178 */
179 #define NUM_URBS 16 /* URB Count */
180 #define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
181
182
183 static struct usb_device_id moschip_port_id_table[] = {
184 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
185 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
194 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
195 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
196 {} /* terminating entry */
197 };
198
199 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
200 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
201 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
205 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
206 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
207 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
208 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
209 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
210 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
211 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
212 {} /* terminating entry */
213 };
214
215 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
216
217 /* This structure holds all of the local port information */
218
219 struct moschip_port {
220 int port_num; /*Actual port number in the device(1,2,etc) */
221 struct urb *write_urb; /* write URB for this port */
222 struct urb *read_urb; /* read URB for this port */
223 struct urb *int_urb;
224 __u8 shadowLCR; /* last LCR value received */
225 __u8 shadowMCR; /* last MCR value received */
226 char open;
227 char open_ports;
228 char zombie;
229 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
230 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
231 int delta_msr_cond;
232 struct async_icount icount;
233 struct usb_serial_port *port; /* loop back to the owner of this object */
234
235 /* Offsets */
236 __u8 SpRegOffset;
237 __u8 ControlRegOffset;
238 __u8 DcrRegOffset;
239 /* for processing control URBS in interrupt context */
240 struct urb *control_urb;
241 struct usb_ctrlrequest *dr;
242 char *ctrl_buf;
243 int MsrLsr;
244
245 spinlock_t pool_lock;
246 struct urb *write_urb_pool[NUM_URBS];
247 char busy[NUM_URBS];
248 bool read_urb_busy;
249 };
250
251
252 static int debug;
253
254 /*
255 * mos7840_set_reg_sync
256 * To set the Control register by calling usb_fill_control_urb function
257 * by passing usb_sndctrlpipe function as parameter.
258 */
259
260 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
261 __u16 val)
262 {
263 struct usb_device *dev = port->serial->dev;
264 val = val & 0x00ff;
265 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
266
267 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
268 MCS_WR_RTYPE, val, reg, NULL, 0,
269 MOS_WDR_TIMEOUT);
270 }
271
272 /*
273 * mos7840_get_reg_sync
274 * To set the Uart register by calling usb_fill_control_urb function by
275 * passing usb_rcvctrlpipe function as parameter.
276 */
277
278 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
279 __u16 *val)
280 {
281 struct usb_device *dev = port->serial->dev;
282 int ret = 0;
283
284 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
285 MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
286 MOS_WDR_TIMEOUT);
287 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
288 *val = (*val) & 0x00ff;
289 return ret;
290 }
291
292 /*
293 * mos7840_set_uart_reg
294 * To set the Uart register by calling usb_fill_control_urb function by
295 * passing usb_sndctrlpipe function as parameter.
296 */
297
298 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
299 __u16 val)
300 {
301
302 struct usb_device *dev = port->serial->dev;
303 val = val & 0x00ff;
304 /* For the UART control registers, the application number need
305 to be Or'ed */
306 if (port->serial->num_ports == 4) {
307 val |= (((__u16) port->number -
308 (__u16) (port->serial->minor)) + 1) << 8;
309 dbg("mos7840_set_uart_reg application number is %x", val);
310 } else {
311 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
312 val |= (((__u16) port->number -
313 (__u16) (port->serial->minor)) + 1) << 8;
314 dbg("mos7840_set_uart_reg application number is %x",
315 val);
316 } else {
317 val |=
318 (((__u16) port->number -
319 (__u16) (port->serial->minor)) + 2) << 8;
320 dbg("mos7840_set_uart_reg application number is %x",
321 val);
322 }
323 }
324 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
325 MCS_WR_RTYPE, val, reg, NULL, 0,
326 MOS_WDR_TIMEOUT);
327
328 }
329
330 /*
331 * mos7840_get_uart_reg
332 * To set the Control register by calling usb_fill_control_urb function
333 * by passing usb_rcvctrlpipe function as parameter.
334 */
335 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
336 __u16 *val)
337 {
338 struct usb_device *dev = port->serial->dev;
339 int ret = 0;
340 __u16 Wval;
341
342 /* dbg("application number is %4x",
343 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
344 /* Wval is same as application number */
345 if (port->serial->num_ports == 4) {
346 Wval =
347 (((__u16) port->number - (__u16) (port->serial->minor)) +
348 1) << 8;
349 dbg("mos7840_get_uart_reg application number is %x", Wval);
350 } else {
351 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
352 Wval = (((__u16) port->number -
353 (__u16) (port->serial->minor)) + 1) << 8;
354 dbg("mos7840_get_uart_reg application number is %x",
355 Wval);
356 } else {
357 Wval = (((__u16) port->number -
358 (__u16) (port->serial->minor)) + 2) << 8;
359 dbg("mos7840_get_uart_reg application number is %x",
360 Wval);
361 }
362 }
363 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
364 MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
365 MOS_WDR_TIMEOUT);
366 *val = (*val) & 0x00ff;
367 return ret;
368 }
369
370 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
371 {
372
373 dbg("***************************************");
374 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
375 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
376 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
377 dbg("***************************************");
378
379 }
380
381 /************************************************************************/
382 /************************************************************************/
383 /* I N T E R F A C E F U N C T I O N S */
384 /* I N T E R F A C E F U N C T I O N S */
385 /************************************************************************/
386 /************************************************************************/
387
388 static inline void mos7840_set_port_private(struct usb_serial_port *port,
389 struct moschip_port *data)
390 {
391 usb_set_serial_port_data(port, (void *)data);
392 }
393
394 static inline struct moschip_port *mos7840_get_port_private(struct
395 usb_serial_port
396 *port)
397 {
398 return (struct moschip_port *)usb_get_serial_port_data(port);
399 }
400
401 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
402 {
403 struct moschip_port *mos7840_port;
404 struct async_icount *icount;
405 mos7840_port = port;
406 icount = &mos7840_port->icount;
407 if (new_msr &
408 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
409 MOS_MSR_DELTA_CD)) {
410 icount = &mos7840_port->icount;
411
412 /* update input line counters */
413 if (new_msr & MOS_MSR_DELTA_CTS) {
414 icount->cts++;
415 smp_wmb();
416 }
417 if (new_msr & MOS_MSR_DELTA_DSR) {
418 icount->dsr++;
419 smp_wmb();
420 }
421 if (new_msr & MOS_MSR_DELTA_CD) {
422 icount->dcd++;
423 smp_wmb();
424 }
425 if (new_msr & MOS_MSR_DELTA_RI) {
426 icount->rng++;
427 smp_wmb();
428 }
429 }
430 }
431
432 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
433 {
434 struct async_icount *icount;
435
436 dbg("%s - %02x", __func__, new_lsr);
437
438 if (new_lsr & SERIAL_LSR_BI) {
439 /*
440 * Parity and Framing errors only count if they
441 * occur exclusive of a break being
442 * received.
443 */
444 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
445 }
446
447 /* update input line counters */
448 icount = &port->icount;
449 if (new_lsr & SERIAL_LSR_BI) {
450 icount->brk++;
451 smp_wmb();
452 }
453 if (new_lsr & SERIAL_LSR_OE) {
454 icount->overrun++;
455 smp_wmb();
456 }
457 if (new_lsr & SERIAL_LSR_PE) {
458 icount->parity++;
459 smp_wmb();
460 }
461 if (new_lsr & SERIAL_LSR_FE) {
462 icount->frame++;
463 smp_wmb();
464 }
465 }
466
467 /************************************************************************/
468 /************************************************************************/
469 /* U S B C A L L B A C K F U N C T I O N S */
470 /* U S B C A L L B A C K F U N C T I O N S */
471 /************************************************************************/
472 /************************************************************************/
473
474 static void mos7840_control_callback(struct urb *urb)
475 {
476 unsigned char *data;
477 struct moschip_port *mos7840_port;
478 __u8 regval = 0x0;
479 int result = 0;
480 int status = urb->status;
481
482 mos7840_port = urb->context;
483
484 switch (status) {
485 case 0:
486 /* success */
487 break;
488 case -ECONNRESET:
489 case -ENOENT:
490 case -ESHUTDOWN:
491 /* this urb is terminated, clean up */
492 dbg("%s - urb shutting down with status: %d", __func__,
493 status);
494 return;
495 default:
496 dbg("%s - nonzero urb status received: %d", __func__,
497 status);
498 goto exit;
499 }
500
501 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
502 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
503 mos7840_port->MsrLsr, mos7840_port->port_num);
504 data = urb->transfer_buffer;
505 regval = (__u8) data[0];
506 dbg("%s data is %x", __func__, regval);
507 if (mos7840_port->MsrLsr == 0)
508 mos7840_handle_new_msr(mos7840_port, regval);
509 else if (mos7840_port->MsrLsr == 1)
510 mos7840_handle_new_lsr(mos7840_port, regval);
511
512 exit:
513 spin_lock(&mos7840_port->pool_lock);
514 if (!mos7840_port->zombie)
515 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
516 spin_unlock(&mos7840_port->pool_lock);
517 if (result) {
518 dev_err(&urb->dev->dev,
519 "%s - Error %d submitting interrupt urb\n",
520 __func__, result);
521 }
522 }
523
524 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
525 __u16 *val)
526 {
527 struct usb_device *dev = mcs->port->serial->dev;
528 struct usb_ctrlrequest *dr = mcs->dr;
529 unsigned char *buffer = mcs->ctrl_buf;
530 int ret;
531
532 dr->bRequestType = MCS_RD_RTYPE;
533 dr->bRequest = MCS_RDREQ;
534 dr->wValue = cpu_to_le16(Wval); /* 0 */
535 dr->wIndex = cpu_to_le16(reg);
536 dr->wLength = cpu_to_le16(2);
537
538 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
539 (unsigned char *)dr, buffer, 2,
540 mos7840_control_callback, mcs);
541 mcs->control_urb->transfer_buffer_length = 2;
542 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
543 return ret;
544 }
545
546 /*****************************************************************************
547 * mos7840_interrupt_callback
548 * this is the callback function for when we have received data on the
549 * interrupt endpoint.
550 *****************************************************************************/
551
552 static void mos7840_interrupt_callback(struct urb *urb)
553 {
554 int result;
555 int length;
556 struct moschip_port *mos7840_port;
557 struct usb_serial *serial;
558 __u16 Data;
559 unsigned char *data;
560 __u8 sp[5], st;
561 int i, rv = 0;
562 __u16 wval, wreg = 0;
563 int status = urb->status;
564
565 dbg("%s", " : Entering");
566
567 switch (status) {
568 case 0:
569 /* success */
570 break;
571 case -ECONNRESET:
572 case -ENOENT:
573 case -ESHUTDOWN:
574 /* this urb is terminated, clean up */
575 dbg("%s - urb shutting down with status: %d", __func__,
576 status);
577 return;
578 default:
579 dbg("%s - nonzero urb status received: %d", __func__,
580 status);
581 goto exit;
582 }
583
584 length = urb->actual_length;
585 data = urb->transfer_buffer;
586
587 serial = urb->context;
588
589 /* Moschip get 5 bytes
590 * Byte 1 IIR Port 1 (port.number is 0)
591 * Byte 2 IIR Port 2 (port.number is 1)
592 * Byte 3 IIR Port 3 (port.number is 2)
593 * Byte 4 IIR Port 4 (port.number is 3)
594 * Byte 5 FIFO status for both */
595
596 if (length && length > 5) {
597 dbg("%s", "Wrong data !!!");
598 return;
599 }
600
601 sp[0] = (__u8) data[0];
602 sp[1] = (__u8) data[1];
603 sp[2] = (__u8) data[2];
604 sp[3] = (__u8) data[3];
605 st = (__u8) data[4];
606
607 for (i = 0; i < serial->num_ports; i++) {
608 mos7840_port = mos7840_get_port_private(serial->port[i]);
609 wval =
610 (((__u16) serial->port[i]->number -
611 (__u16) (serial->minor)) + 1) << 8;
612 if (mos7840_port->open) {
613 if (sp[i] & 0x01) {
614 dbg("SP%d No Interrupt !!!", i);
615 } else {
616 switch (sp[i] & 0x0f) {
617 case SERIAL_IIR_RLS:
618 dbg("Serial Port %d: Receiver status error or ", i);
619 dbg("address bit detected in 9-bit mode");
620 mos7840_port->MsrLsr = 1;
621 wreg = LINE_STATUS_REGISTER;
622 break;
623 case SERIAL_IIR_MS:
624 dbg("Serial Port %d: Modem status change", i);
625 mos7840_port->MsrLsr = 0;
626 wreg = MODEM_STATUS_REGISTER;
627 break;
628 }
629 spin_lock(&mos7840_port->pool_lock);
630 if (!mos7840_port->zombie) {
631 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
632 } else {
633 spin_unlock(&mos7840_port->pool_lock);
634 return;
635 }
636 spin_unlock(&mos7840_port->pool_lock);
637 }
638 }
639 }
640 if (!(rv < 0))
641 /* the completion handler for the control urb will resubmit */
642 return;
643 exit:
644 result = usb_submit_urb(urb, GFP_ATOMIC);
645 if (result) {
646 dev_err(&urb->dev->dev,
647 "%s - Error %d submitting interrupt urb\n",
648 __func__, result);
649 }
650 }
651
652 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
653 const char *function)
654 {
655 if (!port) {
656 dbg("%s - port == NULL", function);
657 return -1;
658 }
659 if (!port->serial) {
660 dbg("%s - port->serial == NULL", function);
661 return -1;
662 }
663
664 return 0;
665 }
666
667 /* Inline functions to check the sanity of a pointer that is passed to us */
668 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
669 const char *function)
670 {
671 if (!serial) {
672 dbg("%s - serial == NULL", function);
673 return -1;
674 }
675 if (!serial->type) {
676 dbg("%s - serial->type == NULL!", function);
677 return -1;
678 }
679
680 return 0;
681 }
682
683 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
684 const char *function)
685 {
686 /* if no port was specified, or it fails a paranoia check */
687 if (!port ||
688 mos7840_port_paranoia_check(port, function) ||
689 mos7840_serial_paranoia_check(port->serial, function)) {
690 /* then say that we don't have a valid usb_serial thing,
691 * which will end up genrating -ENODEV return values */
692 return NULL;
693 }
694
695 return port->serial;
696 }
697
698 /*****************************************************************************
699 * mos7840_bulk_in_callback
700 * this is the callback function for when we have received data on the
701 * bulk in endpoint.
702 *****************************************************************************/
703
704 static void mos7840_bulk_in_callback(struct urb *urb)
705 {
706 int retval;
707 unsigned char *data;
708 struct usb_serial *serial;
709 struct usb_serial_port *port;
710 struct moschip_port *mos7840_port;
711 struct tty_struct *tty;
712 int status = urb->status;
713
714 mos7840_port = urb->context;
715 if (!mos7840_port) {
716 dbg("%s", "NULL mos7840_port pointer");
717 mos7840_port->read_urb_busy = false;
718 return;
719 }
720
721 if (status) {
722 dbg("nonzero read bulk status received: %d", status);
723 mos7840_port->read_urb_busy = false;
724 return;
725 }
726
727 port = (struct usb_serial_port *)mos7840_port->port;
728 if (mos7840_port_paranoia_check(port, __func__)) {
729 dbg("%s", "Port Paranoia failed");
730 mos7840_port->read_urb_busy = false;
731 return;
732 }
733
734 serial = mos7840_get_usb_serial(port, __func__);
735 if (!serial) {
736 dbg("%s", "Bad serial pointer");
737 mos7840_port->read_urb_busy = false;
738 return;
739 }
740
741 dbg("%s", "Entering... ");
742
743 data = urb->transfer_buffer;
744
745 dbg("%s", "Entering ...........");
746
747 if (urb->actual_length) {
748 tty = tty_port_tty_get(&mos7840_port->port->port);
749 if (tty) {
750 tty_buffer_request_room(tty, urb->actual_length);
751 tty_insert_flip_string(tty, data, urb->actual_length);
752 dbg(" %s ", data);
753 tty_flip_buffer_push(tty);
754 tty_kref_put(tty);
755 }
756 mos7840_port->icount.rx += urb->actual_length;
757 smp_wmb();
758 dbg("mos7840_port->icount.rx is %d:",
759 mos7840_port->icount.rx);
760 }
761
762 if (!mos7840_port->read_urb) {
763 dbg("%s", "URB KILLED !!!");
764 mos7840_port->read_urb_busy = false;
765 return;
766 }
767
768
769 mos7840_port->read_urb->dev = serial->dev;
770
771 mos7840_port->read_urb_busy = true;
772 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
773
774 if (retval) {
775 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
776 mos7840_port->read_urb_busy = false;
777 }
778 }
779
780 /*****************************************************************************
781 * mos7840_bulk_out_data_callback
782 * this is the callback function for when we have finished sending
783 * serial data on the bulk out endpoint.
784 *****************************************************************************/
785
786 static void mos7840_bulk_out_data_callback(struct urb *urb)
787 {
788 struct moschip_port *mos7840_port;
789 struct tty_struct *tty;
790 int status = urb->status;
791 int i;
792
793 mos7840_port = urb->context;
794 spin_lock(&mos7840_port->pool_lock);
795 for (i = 0; i < NUM_URBS; i++) {
796 if (urb == mos7840_port->write_urb_pool[i]) {
797 mos7840_port->busy[i] = 0;
798 break;
799 }
800 }
801 spin_unlock(&mos7840_port->pool_lock);
802
803 if (status) {
804 dbg("nonzero write bulk status received:%d", status);
805 return;
806 }
807
808 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
809 dbg("%s", "Port Paranoia failed");
810 return;
811 }
812
813 dbg("%s", "Entering .........");
814
815 tty = tty_port_tty_get(&mos7840_port->port->port);
816 if (tty && mos7840_port->open)
817 tty_wakeup(tty);
818 tty_kref_put(tty);
819
820 }
821
822 /************************************************************************/
823 /* 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 */
824 /************************************************************************/
825 #ifdef MCSSerialProbe
826 static int mos7840_serial_probe(struct usb_serial *serial,
827 const struct usb_device_id *id)
828 {
829
830 /*need to implement the mode_reg reading and updating\
831 structures usb_serial_ device_type\
832 (i.e num_ports, num_bulkin,bulkout etc) */
833 /* Also we can update the changes attach */
834 return 1;
835 }
836 #endif
837
838 /*****************************************************************************
839 * mos7840_open
840 * this function is called by the tty driver when a port is opened
841 * If successful, we return 0
842 * Otherwise we return a negative error number.
843 *****************************************************************************/
844
845 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
846 {
847 int response;
848 int j;
849 struct usb_serial *serial;
850 struct urb *urb;
851 __u16 Data;
852 int status;
853 struct moschip_port *mos7840_port;
854 struct moschip_port *port0;
855
856 dbg ("%s enter", __func__);
857
858 if (mos7840_port_paranoia_check(port, __func__)) {
859 dbg("%s", "Port Paranoia failed");
860 return -ENODEV;
861 }
862
863 serial = port->serial;
864
865 if (mos7840_serial_paranoia_check(serial, __func__)) {
866 dbg("%s", "Serial Paranoia failed");
867 return -ENODEV;
868 }
869
870 mos7840_port = mos7840_get_port_private(port);
871 port0 = mos7840_get_port_private(serial->port[0]);
872
873 if (mos7840_port == NULL || port0 == NULL)
874 return -ENODEV;
875
876 usb_clear_halt(serial->dev, port->write_urb->pipe);
877 usb_clear_halt(serial->dev, port->read_urb->pipe);
878 port0->open_ports++;
879
880 /* Initialising the write urb pool */
881 for (j = 0; j < NUM_URBS; ++j) {
882 urb = usb_alloc_urb(0, GFP_KERNEL);
883 mos7840_port->write_urb_pool[j] = urb;
884
885 if (urb == NULL) {
886 dev_err(&port->dev, "No more urbs???\n");
887 continue;
888 }
889
890 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
891 GFP_KERNEL);
892 if (!urb->transfer_buffer) {
893 usb_free_urb(urb);
894 mos7840_port->write_urb_pool[j] = NULL;
895 dev_err(&port->dev,
896 "%s-out of memory for urb buffers.\n",
897 __func__);
898 continue;
899 }
900 }
901
902 /*****************************************************************************
903 * Initialize MCS7840 -- Write Init values to corresponding Registers
904 *
905 * Register Index
906 * 1 : IER
907 * 2 : FCR
908 * 3 : LCR
909 * 4 : MCR
910 *
911 * 0x08 : SP1/2 Control Reg
912 *****************************************************************************/
913
914 /* NEED to check the following Block */
915
916 Data = 0x0;
917 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
918 if (status < 0) {
919 dbg("Reading Spreg failed");
920 return -1;
921 }
922 Data |= 0x80;
923 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
924 if (status < 0) {
925 dbg("writing Spreg failed");
926 return -1;
927 }
928
929 Data &= ~0x80;
930 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
931 if (status < 0) {
932 dbg("writing Spreg failed");
933 return -1;
934 }
935 /* End of block to be checked */
936
937 Data = 0x0;
938 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
939 &Data);
940 if (status < 0) {
941 dbg("Reading Controlreg failed");
942 return -1;
943 }
944 Data |= 0x08; /* Driver done bit */
945 Data |= 0x20; /* rx_disable */
946 status = mos7840_set_reg_sync(port,
947 mos7840_port->ControlRegOffset, Data);
948 if (status < 0) {
949 dbg("writing Controlreg failed");
950 return -1;
951 }
952 /* do register settings here */
953 /* Set all regs to the device default values. */
954 /***********************************
955 * First Disable all interrupts.
956 ***********************************/
957 Data = 0x00;
958 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
959 if (status < 0) {
960 dbg("disabling interrupts failed");
961 return -1;
962 }
963 /* Set FIFO_CONTROL_REGISTER to the default value */
964 Data = 0x00;
965 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
966 if (status < 0) {
967 dbg("Writing FIFO_CONTROL_REGISTER failed");
968 return -1;
969 }
970
971 Data = 0xcf;
972 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
973 if (status < 0) {
974 dbg("Writing FIFO_CONTROL_REGISTER failed");
975 return -1;
976 }
977
978 Data = 0x03;
979 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
980 mos7840_port->shadowLCR = Data;
981
982 Data = 0x0b;
983 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
984 mos7840_port->shadowMCR = Data;
985
986 Data = 0x00;
987 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
988 mos7840_port->shadowLCR = Data;
989
990 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
991 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
992
993 Data = 0x0c;
994 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
995
996 Data = 0x0;
997 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
998
999 Data = 0x00;
1000 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1001
1002 Data = Data & ~SERIAL_LCR_DLAB;
1003 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1004 mos7840_port->shadowLCR = Data;
1005
1006 /* clearing Bulkin and Bulkout Fifo */
1007 Data = 0x0;
1008 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1009
1010 Data = Data | 0x0c;
1011 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1012
1013 Data = Data & ~0x0c;
1014 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1015 /* Finally enable all interrupts */
1016 Data = 0x0c;
1017 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1018
1019 /* clearing rx_disable */
1020 Data = 0x0;
1021 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1022 &Data);
1023 Data = Data & ~0x20;
1024 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1025 Data);
1026
1027 /* rx_negate */
1028 Data = 0x0;
1029 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1030 &Data);
1031 Data = Data | 0x10;
1032 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1033 Data);
1034
1035 /* Check to see if we've set up our endpoint info yet *
1036 * (can't set it up in mos7840_startup as the structures *
1037 * were not set up at that time.) */
1038 if (port0->open_ports == 1) {
1039 if (serial->port[0]->interrupt_in_buffer == NULL) {
1040 /* set up interrupt urb */
1041 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1042 serial->dev,
1043 usb_rcvintpipe(serial->dev,
1044 serial->port[0]->interrupt_in_endpointAddress),
1045 serial->port[0]->interrupt_in_buffer,
1046 serial->port[0]->interrupt_in_urb->
1047 transfer_buffer_length,
1048 mos7840_interrupt_callback,
1049 serial,
1050 serial->port[0]->interrupt_in_urb->interval);
1051
1052 /* start interrupt read for mos7840 *
1053 * will continue as long as mos7840 is connected */
1054
1055 response =
1056 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1057 GFP_KERNEL);
1058 if (response) {
1059 dev_err(&port->dev, "%s - Error %d submitting "
1060 "interrupt urb\n", __func__, response);
1061 }
1062
1063 }
1064
1065 }
1066
1067 /* see if we've set up our endpoint info yet *
1068 * (can't set it up in mos7840_startup as the *
1069 * structures were not set up at that time.) */
1070
1071 dbg("port number is %d", port->number);
1072 dbg("serial number is %d", port->serial->minor);
1073 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1074 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1075 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1076 dbg("port's number in the device is %d", mos7840_port->port_num);
1077 mos7840_port->read_urb = port->read_urb;
1078
1079 /* set up our bulk in urb */
1080
1081 usb_fill_bulk_urb(mos7840_port->read_urb,
1082 serial->dev,
1083 usb_rcvbulkpipe(serial->dev,
1084 port->bulk_in_endpointAddress),
1085 port->bulk_in_buffer,
1086 mos7840_port->read_urb->transfer_buffer_length,
1087 mos7840_bulk_in_callback, mos7840_port);
1088
1089 dbg("mos7840_open: bulkin endpoint is %d",
1090 port->bulk_in_endpointAddress);
1091 mos7840_port->read_urb_busy = true;
1092 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1093 if (response) {
1094 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1095 __func__, response);
1096 mos7840_port->read_urb_busy = false;
1097 }
1098
1099 /* initialize our wait queues */
1100 init_waitqueue_head(&mos7840_port->wait_chase);
1101 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1102
1103 /* initialize our icount structure */
1104 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1105
1106 /* initialize our port settings */
1107 /* Must set to enable ints! */
1108 mos7840_port->shadowMCR = MCR_MASTER_IE;
1109 /* send a open port command */
1110 mos7840_port->open = 1;
1111 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1112 mos7840_port->icount.tx = 0;
1113 mos7840_port->icount.rx = 0;
1114
1115 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1116 serial, mos7840_port, port);
1117
1118 dbg ("%s leave", __func__);
1119
1120 return 0;
1121
1122 }
1123
1124 /*****************************************************************************
1125 * mos7840_chars_in_buffer
1126 * this function is called by the tty driver when it wants to know how many
1127 * bytes of data we currently have outstanding in the port (data that has
1128 * been written, but hasn't made it out the port yet)
1129 * If successful, we return the number of bytes left to be written in the
1130 * system,
1131 * Otherwise we return zero.
1132 *****************************************************************************/
1133
1134 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1135 {
1136 struct usb_serial_port *port = tty->driver_data;
1137 int i;
1138 int chars = 0;
1139 unsigned long flags;
1140 struct moschip_port *mos7840_port;
1141
1142 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1143
1144 if (mos7840_port_paranoia_check(port, __func__)) {
1145 dbg("%s", "Invalid port");
1146 return 0;
1147 }
1148
1149 mos7840_port = mos7840_get_port_private(port);
1150 if (mos7840_port == NULL) {
1151 dbg("%s", "mos7840_break:leaving ...........");
1152 return 0;
1153 }
1154
1155 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1156 for (i = 0; i < NUM_URBS; ++i)
1157 if (mos7840_port->busy[i])
1158 chars += URB_TRANSFER_BUFFER_SIZE;
1159 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1160 dbg("%s - returns %d", __func__, chars);
1161 return chars;
1162
1163 }
1164
1165 /*****************************************************************************
1166 * mos7840_close
1167 * this function is called by the tty driver when a port is closed
1168 *****************************************************************************/
1169
1170 static void mos7840_close(struct usb_serial_port *port)
1171 {
1172 struct usb_serial *serial;
1173 struct moschip_port *mos7840_port;
1174 struct moschip_port *port0;
1175 int j;
1176 __u16 Data;
1177
1178 dbg("%s", "mos7840_close:entering...");
1179
1180 if (mos7840_port_paranoia_check(port, __func__)) {
1181 dbg("%s", "Port Paranoia failed");
1182 return;
1183 }
1184
1185 serial = mos7840_get_usb_serial(port, __func__);
1186 if (!serial) {
1187 dbg("%s", "Serial Paranoia failed");
1188 return;
1189 }
1190
1191 mos7840_port = mos7840_get_port_private(port);
1192 port0 = mos7840_get_port_private(serial->port[0]);
1193
1194 if (mos7840_port == NULL || port0 == NULL)
1195 return;
1196
1197 for (j = 0; j < NUM_URBS; ++j)
1198 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1199
1200 /* Freeing Write URBs */
1201 for (j = 0; j < NUM_URBS; ++j) {
1202 if (mos7840_port->write_urb_pool[j]) {
1203 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1204 kfree(mos7840_port->write_urb_pool[j]->
1205 transfer_buffer);
1206
1207 usb_free_urb(mos7840_port->write_urb_pool[j]);
1208 }
1209 }
1210
1211 /* While closing port, shutdown all bulk read, write *
1212 * and interrupt read if they exists */
1213 if (serial->dev) {
1214 if (mos7840_port->write_urb) {
1215 dbg("%s", "Shutdown bulk write");
1216 usb_kill_urb(mos7840_port->write_urb);
1217 }
1218 if (mos7840_port->read_urb) {
1219 dbg("%s", "Shutdown bulk read");
1220 usb_kill_urb(mos7840_port->read_urb);
1221 mos7840_port->read_urb_busy = false;
1222 }
1223 if ((&mos7840_port->control_urb)) {
1224 dbg("%s", "Shutdown control read");
1225 /*/ usb_kill_urb (mos7840_port->control_urb); */
1226 }
1227 }
1228 /* if(mos7840_port->ctrl_buf != NULL) */
1229 /* kfree(mos7840_port->ctrl_buf); */
1230 port0->open_ports--;
1231 dbg("mos7840_num_open_ports in close%d:in port%d",
1232 port0->open_ports, port->number);
1233 if (port0->open_ports == 0) {
1234 if (serial->port[0]->interrupt_in_urb) {
1235 dbg("%s", "Shutdown interrupt_in_urb");
1236 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1237 }
1238 }
1239
1240 if (mos7840_port->write_urb) {
1241 /* if this urb had a transfer buffer already (old tx) free it */
1242 if (mos7840_port->write_urb->transfer_buffer != NULL)
1243 kfree(mos7840_port->write_urb->transfer_buffer);
1244 usb_free_urb(mos7840_port->write_urb);
1245 }
1246
1247 Data = 0x0;
1248 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1249
1250 Data = 0x00;
1251 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1252
1253 mos7840_port->open = 0;
1254
1255 dbg("%s", "Leaving ............");
1256 }
1257
1258 /************************************************************************
1259 *
1260 * mos7840_block_until_chase_response
1261 *
1262 * This function will block the close until one of the following:
1263 * 1. Response to our Chase comes from mos7840
1264 * 2. A timeout of 10 seconds without activity has expired
1265 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1266 *
1267 ************************************************************************/
1268
1269 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1270 struct moschip_port *mos7840_port)
1271 {
1272 int timeout = 1 * HZ;
1273 int wait = 10;
1274 int count;
1275
1276 while (1) {
1277 count = mos7840_chars_in_buffer(tty);
1278
1279 /* Check for Buffer status */
1280 if (count <= 0)
1281 return;
1282
1283 /* Block the thread for a while */
1284 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1285 timeout);
1286 /* No activity.. count down section */
1287 wait--;
1288 if (wait == 0) {
1289 dbg("%s - TIMEOUT", __func__);
1290 return;
1291 } else {
1292 /* Reset timeout value back to seconds */
1293 wait = 10;
1294 }
1295 }
1296
1297 }
1298
1299 /*****************************************************************************
1300 * mos7840_break
1301 * this function sends a break to the port
1302 *****************************************************************************/
1303 static void mos7840_break(struct tty_struct *tty, int break_state)
1304 {
1305 struct usb_serial_port *port = tty->driver_data;
1306 unsigned char data;
1307 struct usb_serial *serial;
1308 struct moschip_port *mos7840_port;
1309
1310 dbg("%s", "Entering ...........");
1311 dbg("mos7840_break: Start");
1312
1313 if (mos7840_port_paranoia_check(port, __func__)) {
1314 dbg("%s", "Port Paranoia failed");
1315 return;
1316 }
1317
1318 serial = mos7840_get_usb_serial(port, __func__);
1319 if (!serial) {
1320 dbg("%s", "Serial Paranoia failed");
1321 return;
1322 }
1323
1324 mos7840_port = mos7840_get_port_private(port);
1325
1326 if (mos7840_port == NULL)
1327 return;
1328
1329 if (serial->dev)
1330 /* flush and block until tx is empty */
1331 mos7840_block_until_chase_response(tty, mos7840_port);
1332
1333 if (break_state == -1)
1334 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1335 else
1336 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1337
1338 /* FIXME: no locking on shadowLCR anywhere in driver */
1339 mos7840_port->shadowLCR = data;
1340 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1341 mos7840_port->shadowLCR);
1342 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1343 mos7840_port->shadowLCR);
1344
1345 return;
1346 }
1347
1348 /*****************************************************************************
1349 * mos7840_write_room
1350 * this function is called by the tty driver when it wants to know how many
1351 * bytes of data we can accept for a specific port.
1352 * If successful, we return the amount of room that we have for this port
1353 * Otherwise we return a negative error number.
1354 *****************************************************************************/
1355
1356 static int mos7840_write_room(struct tty_struct *tty)
1357 {
1358 struct usb_serial_port *port = tty->driver_data;
1359 int i;
1360 int room = 0;
1361 unsigned long flags;
1362 struct moschip_port *mos7840_port;
1363
1364 dbg("%s", " mos7840_write_room:entering ...........");
1365
1366 if (mos7840_port_paranoia_check(port, __func__)) {
1367 dbg("%s", "Invalid port");
1368 dbg("%s", " mos7840_write_room:leaving ...........");
1369 return -1;
1370 }
1371
1372 mos7840_port = mos7840_get_port_private(port);
1373 if (mos7840_port == NULL) {
1374 dbg("%s", "mos7840_break:leaving ...........");
1375 return -1;
1376 }
1377
1378 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1379 for (i = 0; i < NUM_URBS; ++i) {
1380 if (!mos7840_port->busy[i])
1381 room += URB_TRANSFER_BUFFER_SIZE;
1382 }
1383 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1384
1385 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1386 dbg("%s - returns %d", __func__, room);
1387 return room;
1388
1389 }
1390
1391 /*****************************************************************************
1392 * mos7840_write
1393 * this function is called by the tty driver when data should be written to
1394 * the port.
1395 * If successful, we return the number of bytes written, otherwise we
1396 * return a negative error number.
1397 *****************************************************************************/
1398
1399 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1400 const unsigned char *data, int count)
1401 {
1402 int status;
1403 int i;
1404 int bytes_sent = 0;
1405 int transfer_size;
1406 unsigned long flags;
1407
1408 struct moschip_port *mos7840_port;
1409 struct usb_serial *serial;
1410 struct urb *urb;
1411 /* __u16 Data; */
1412 const unsigned char *current_position = data;
1413 unsigned char *data1;
1414 dbg("%s", "entering ...........");
1415 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1416 mos7840_port->shadowLCR); */
1417
1418 #ifdef NOTMOS7840
1419 Data = 0x00;
1420 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1421 mos7840_port->shadowLCR = Data;
1422 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1423 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1424 mos7840_port->shadowLCR);
1425
1426 /* Data = 0x03; */
1427 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1428 /* mos7840_port->shadowLCR=Data;//Need to add later */
1429
1430 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1431 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1432
1433 /* Data = 0x0c; */
1434 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1435 Data = 0x00;
1436 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1437 dbg("mos7840_write:DLL value is %x", Data);
1438
1439 Data = 0x0;
1440 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1441 dbg("mos7840_write:DLM value is %x", Data);
1442
1443 Data = Data & ~SERIAL_LCR_DLAB;
1444 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1445 mos7840_port->shadowLCR);
1446 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1447 #endif
1448
1449 if (mos7840_port_paranoia_check(port, __func__)) {
1450 dbg("%s", "Port Paranoia failed");
1451 return -1;
1452 }
1453
1454 serial = port->serial;
1455 if (mos7840_serial_paranoia_check(serial, __func__)) {
1456 dbg("%s", "Serial Paranoia failed");
1457 return -1;
1458 }
1459
1460 mos7840_port = mos7840_get_port_private(port);
1461 if (mos7840_port == NULL) {
1462 dbg("%s", "mos7840_port is NULL");
1463 return -1;
1464 }
1465
1466 /* try to find a free urb in the list */
1467 urb = NULL;
1468
1469 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1470 for (i = 0; i < NUM_URBS; ++i) {
1471 if (!mos7840_port->busy[i]) {
1472 mos7840_port->busy[i] = 1;
1473 urb = mos7840_port->write_urb_pool[i];
1474 dbg("URB:%d", i);
1475 break;
1476 }
1477 }
1478 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1479
1480 if (urb == NULL) {
1481 dbg("%s - no more free urbs", __func__);
1482 goto exit;
1483 }
1484
1485 if (urb->transfer_buffer == NULL) {
1486 urb->transfer_buffer =
1487 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1488
1489 if (urb->transfer_buffer == NULL) {
1490 dev_err(&port->dev, "%s no more kernel memory...\n",
1491 __func__);
1492 goto exit;
1493 }
1494 }
1495 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1496
1497 memcpy(urb->transfer_buffer, current_position, transfer_size);
1498
1499 /* fill urb with data and submit */
1500 usb_fill_bulk_urb(urb,
1501 serial->dev,
1502 usb_sndbulkpipe(serial->dev,
1503 port->bulk_out_endpointAddress),
1504 urb->transfer_buffer,
1505 transfer_size,
1506 mos7840_bulk_out_data_callback, mos7840_port);
1507
1508 data1 = urb->transfer_buffer;
1509 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1510
1511 /* send it down the pipe */
1512 status = usb_submit_urb(urb, GFP_ATOMIC);
1513
1514 if (status) {
1515 mos7840_port->busy[i] = 0;
1516 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1517 "with status = %d\n", __func__, status);
1518 bytes_sent = status;
1519 goto exit;
1520 }
1521 bytes_sent = transfer_size;
1522 mos7840_port->icount.tx += transfer_size;
1523 smp_wmb();
1524 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1525 exit:
1526 return bytes_sent;
1527
1528 }
1529
1530 /*****************************************************************************
1531 * mos7840_throttle
1532 * this function is called by the tty driver when it wants to stop the data
1533 * being read from the port.
1534 *****************************************************************************/
1535
1536 static void mos7840_throttle(struct tty_struct *tty)
1537 {
1538 struct usb_serial_port *port = tty->driver_data;
1539 struct moschip_port *mos7840_port;
1540 int status;
1541
1542 if (mos7840_port_paranoia_check(port, __func__)) {
1543 dbg("%s", "Invalid port");
1544 return;
1545 }
1546
1547 dbg("- port %d", port->number);
1548
1549 mos7840_port = mos7840_get_port_private(port);
1550
1551 if (mos7840_port == NULL)
1552 return;
1553
1554 if (!mos7840_port->open) {
1555 dbg("%s", "port not opened");
1556 return;
1557 }
1558
1559 dbg("%s", "Entering ..........");
1560
1561 /* if we are implementing XON/XOFF, send the stop character */
1562 if (I_IXOFF(tty)) {
1563 unsigned char stop_char = STOP_CHAR(tty);
1564 status = mos7840_write(tty, port, &stop_char, 1);
1565 if (status <= 0)
1566 return;
1567 }
1568 /* if we are implementing RTS/CTS, toggle that line */
1569 if (tty->termios->c_cflag & CRTSCTS) {
1570 mos7840_port->shadowMCR &= ~MCR_RTS;
1571 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1572 mos7840_port->shadowMCR);
1573 if (status < 0)
1574 return;
1575 }
1576
1577 return;
1578 }
1579
1580 /*****************************************************************************
1581 * mos7840_unthrottle
1582 * this function is called by the tty driver when it wants to resume
1583 * the data being read from the port (called after mos7840_throttle is
1584 * called)
1585 *****************************************************************************/
1586 static void mos7840_unthrottle(struct tty_struct *tty)
1587 {
1588 struct usb_serial_port *port = tty->driver_data;
1589 int status;
1590 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1591
1592 if (mos7840_port_paranoia_check(port, __func__)) {
1593 dbg("%s", "Invalid port");
1594 return;
1595 }
1596
1597 if (mos7840_port == NULL)
1598 return;
1599
1600 if (!mos7840_port->open) {
1601 dbg("%s - port not opened", __func__);
1602 return;
1603 }
1604
1605 dbg("%s", "Entering ..........");
1606
1607 /* if we are implementing XON/XOFF, send the start character */
1608 if (I_IXOFF(tty)) {
1609 unsigned char start_char = START_CHAR(tty);
1610 status = mos7840_write(tty, port, &start_char, 1);
1611 if (status <= 0)
1612 return;
1613 }
1614
1615 /* if we are implementing RTS/CTS, toggle that line */
1616 if (tty->termios->c_cflag & CRTSCTS) {
1617 mos7840_port->shadowMCR |= MCR_RTS;
1618 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1619 mos7840_port->shadowMCR);
1620 if (status < 0)
1621 return;
1622 }
1623 }
1624
1625 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1626 {
1627 struct usb_serial_port *port = tty->driver_data;
1628 struct moschip_port *mos7840_port;
1629 unsigned int result;
1630 __u16 msr;
1631 __u16 mcr;
1632 int status;
1633 mos7840_port = mos7840_get_port_private(port);
1634
1635 dbg("%s - port %d", __func__, port->number);
1636
1637 if (mos7840_port == NULL)
1638 return -ENODEV;
1639
1640 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1641 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1642 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1643 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1644 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1645 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1646 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1647 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1648 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1649
1650 dbg("%s - 0x%04X", __func__, result);
1651
1652 return result;
1653 }
1654
1655 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1656 unsigned int set, unsigned int clear)
1657 {
1658 struct usb_serial_port *port = tty->driver_data;
1659 struct moschip_port *mos7840_port;
1660 unsigned int mcr;
1661 int status;
1662
1663 dbg("%s - port %d", __func__, port->number);
1664
1665 mos7840_port = mos7840_get_port_private(port);
1666
1667 if (mos7840_port == NULL)
1668 return -ENODEV;
1669
1670 /* FIXME: What locks the port registers ? */
1671 mcr = mos7840_port->shadowMCR;
1672 if (clear & TIOCM_RTS)
1673 mcr &= ~MCR_RTS;
1674 if (clear & TIOCM_DTR)
1675 mcr &= ~MCR_DTR;
1676 if (clear & TIOCM_LOOP)
1677 mcr &= ~MCR_LOOPBACK;
1678
1679 if (set & TIOCM_RTS)
1680 mcr |= MCR_RTS;
1681 if (set & TIOCM_DTR)
1682 mcr |= MCR_DTR;
1683 if (set & TIOCM_LOOP)
1684 mcr |= MCR_LOOPBACK;
1685
1686 mos7840_port->shadowMCR = mcr;
1687
1688 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1689 if (status < 0) {
1690 dbg("setting MODEM_CONTROL_REGISTER Failed");
1691 return status;
1692 }
1693
1694 return 0;
1695 }
1696
1697 /*****************************************************************************
1698 * mos7840_calc_baud_rate_divisor
1699 * this function calculates the proper baud rate divisor for the specified
1700 * baud rate.
1701 *****************************************************************************/
1702 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1703 __u16 *clk_sel_val)
1704 {
1705
1706 dbg("%s - %d", __func__, baudRate);
1707
1708 if (baudRate <= 115200) {
1709 *divisor = 115200 / baudRate;
1710 *clk_sel_val = 0x0;
1711 }
1712 if ((baudRate > 115200) && (baudRate <= 230400)) {
1713 *divisor = 230400 / baudRate;
1714 *clk_sel_val = 0x10;
1715 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1716 *divisor = 403200 / baudRate;
1717 *clk_sel_val = 0x20;
1718 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1719 *divisor = 460800 / baudRate;
1720 *clk_sel_val = 0x30;
1721 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1722 *divisor = 806400 / baudRate;
1723 *clk_sel_val = 0x40;
1724 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1725 *divisor = 921600 / baudRate;
1726 *clk_sel_val = 0x50;
1727 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1728 *divisor = 1572864 / baudRate;
1729 *clk_sel_val = 0x60;
1730 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1731 *divisor = 3145728 / baudRate;
1732 *clk_sel_val = 0x70;
1733 }
1734 return 0;
1735
1736 #ifdef NOTMCS7840
1737
1738 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1739 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1740 *divisor = mos7840_divisor_table[i].Divisor;
1741 return 0;
1742 }
1743 }
1744
1745 /* After trying for all the standard baud rates *
1746 * Try calculating the divisor for this baud rate */
1747
1748 if (baudrate > 75 && baudrate < 230400) {
1749 /* get the divisor */
1750 custom = (__u16) (230400L / baudrate);
1751
1752 /* Check for round off */
1753 round1 = (__u16) (2304000L / baudrate);
1754 round = (__u16) (round1 - (custom * 10));
1755 if (round > 4)
1756 custom++;
1757 *divisor = custom;
1758
1759 dbg(" Baud %d = %d", baudrate, custom);
1760 return 0;
1761 }
1762
1763 dbg("%s", " Baud calculation Failed...");
1764 return -1;
1765 #endif
1766 }
1767
1768 /*****************************************************************************
1769 * mos7840_send_cmd_write_baud_rate
1770 * this function sends the proper command to change the baud rate of the
1771 * specified port.
1772 *****************************************************************************/
1773
1774 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1775 int baudRate)
1776 {
1777 int divisor = 0;
1778 int status;
1779 __u16 Data;
1780 unsigned char number;
1781 __u16 clk_sel_val;
1782 struct usb_serial_port *port;
1783
1784 if (mos7840_port == NULL)
1785 return -1;
1786
1787 port = (struct usb_serial_port *)mos7840_port->port;
1788 if (mos7840_port_paranoia_check(port, __func__)) {
1789 dbg("%s", "Invalid port");
1790 return -1;
1791 }
1792
1793 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1794 dbg("%s", "Invalid Serial");
1795 return -1;
1796 }
1797
1798 dbg("%s", "Entering ..........");
1799
1800 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1801
1802 dbg("%s - port = %d, baud = %d", __func__,
1803 mos7840_port->port->number, baudRate);
1804 /* reset clk_uart_sel in spregOffset */
1805 if (baudRate > 115200) {
1806 #ifdef HW_flow_control
1807 /* NOTE: need to see the pther register to modify */
1808 /* setting h/w flow control bit to 1 */
1809 Data = 0x2b;
1810 mos7840_port->shadowMCR = Data;
1811 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1812 Data);
1813 if (status < 0) {
1814 dbg("Writing spreg failed in set_serial_baud");
1815 return -1;
1816 }
1817 #endif
1818
1819 } else {
1820 #ifdef HW_flow_control
1821 / *setting h/w flow control bit to 0 */
1822 Data = 0xb;
1823 mos7840_port->shadowMCR = Data;
1824 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1825 Data);
1826 if (status < 0) {
1827 dbg("Writing spreg failed in set_serial_baud");
1828 return -1;
1829 }
1830 #endif
1831
1832 }
1833
1834 if (1) { /* baudRate <= 115200) */
1835 clk_sel_val = 0x0;
1836 Data = 0x0;
1837 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1838 &clk_sel_val);
1839 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1840 &Data);
1841 if (status < 0) {
1842 dbg("reading spreg failed in set_serial_baud");
1843 return -1;
1844 }
1845 Data = (Data & 0x8f) | clk_sel_val;
1846 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1847 Data);
1848 if (status < 0) {
1849 dbg("Writing spreg failed in set_serial_baud");
1850 return -1;
1851 }
1852 /* Calculate the Divisor */
1853
1854 if (status) {
1855 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1856 return status;
1857 }
1858 /* Enable access to divisor latch */
1859 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1860 mos7840_port->shadowLCR = Data;
1861 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1862
1863 /* Write the divisor */
1864 Data = (unsigned char)(divisor & 0xff);
1865 dbg("set_serial_baud Value to write DLL is %x", Data);
1866 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1867
1868 Data = (unsigned char)((divisor & 0xff00) >> 8);
1869 dbg("set_serial_baud Value to write DLM is %x", Data);
1870 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1871
1872 /* Disable access to divisor latch */
1873 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1874 mos7840_port->shadowLCR = Data;
1875 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1876
1877 }
1878 return status;
1879 }
1880
1881 /*****************************************************************************
1882 * mos7840_change_port_settings
1883 * This routine is called to set the UART on the device to match
1884 * the specified new settings.
1885 *****************************************************************************/
1886
1887 static void mos7840_change_port_settings(struct tty_struct *tty,
1888 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1889 {
1890 int baud;
1891 unsigned cflag;
1892 unsigned iflag;
1893 __u8 lData;
1894 __u8 lParity;
1895 __u8 lStop;
1896 int status;
1897 __u16 Data;
1898 struct usb_serial_port *port;
1899 struct usb_serial *serial;
1900
1901 if (mos7840_port == NULL)
1902 return;
1903
1904 port = (struct usb_serial_port *)mos7840_port->port;
1905
1906 if (mos7840_port_paranoia_check(port, __func__)) {
1907 dbg("%s", "Invalid port");
1908 return;
1909 }
1910
1911 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1912 dbg("%s", "Invalid Serial");
1913 return;
1914 }
1915
1916 serial = port->serial;
1917
1918 dbg("%s - port %d", __func__, mos7840_port->port->number);
1919
1920 if (!mos7840_port->open) {
1921 dbg("%s - port not opened", __func__);
1922 return;
1923 }
1924
1925 dbg("%s", "Entering ..........");
1926
1927 lData = LCR_BITS_8;
1928 lStop = LCR_STOP_1;
1929 lParity = LCR_PAR_NONE;
1930
1931 cflag = tty->termios->c_cflag;
1932 iflag = tty->termios->c_iflag;
1933
1934 /* Change the number of bits */
1935 if (cflag & CSIZE) {
1936 switch (cflag & CSIZE) {
1937 case CS5:
1938 lData = LCR_BITS_5;
1939 break;
1940
1941 case CS6:
1942 lData = LCR_BITS_6;
1943 break;
1944
1945 case CS7:
1946 lData = LCR_BITS_7;
1947 break;
1948 default:
1949 case CS8:
1950 lData = LCR_BITS_8;
1951 break;
1952 }
1953 }
1954 /* Change the Parity bit */
1955 if (cflag & PARENB) {
1956 if (cflag & PARODD) {
1957 lParity = LCR_PAR_ODD;
1958 dbg("%s - parity = odd", __func__);
1959 } else {
1960 lParity = LCR_PAR_EVEN;
1961 dbg("%s - parity = even", __func__);
1962 }
1963
1964 } else {
1965 dbg("%s - parity = none", __func__);
1966 }
1967
1968 if (cflag & CMSPAR)
1969 lParity = lParity | 0x20;
1970
1971 /* Change the Stop bit */
1972 if (cflag & CSTOPB) {
1973 lStop = LCR_STOP_2;
1974 dbg("%s - stop bits = 2", __func__);
1975 } else {
1976 lStop = LCR_STOP_1;
1977 dbg("%s - stop bits = 1", __func__);
1978 }
1979
1980 /* Update the LCR with the correct value */
1981 mos7840_port->shadowLCR &=
1982 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1983 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1984
1985 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1986 mos7840_port->shadowLCR);
1987 /* Disable Interrupts */
1988 Data = 0x00;
1989 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1990
1991 Data = 0x00;
1992 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1993
1994 Data = 0xcf;
1995 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1996
1997 /* Send the updated LCR value to the mos7840 */
1998 Data = mos7840_port->shadowLCR;
1999
2000 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2001
2002 Data = 0x00b;
2003 mos7840_port->shadowMCR = Data;
2004 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2005 Data = 0x00b;
2006 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2007
2008 /* set up the MCR register and send it to the mos7840 */
2009
2010 mos7840_port->shadowMCR = MCR_MASTER_IE;
2011 if (cflag & CBAUD)
2012 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2013
2014 if (cflag & CRTSCTS)
2015 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2016 else
2017 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2018
2019 Data = mos7840_port->shadowMCR;
2020 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2021
2022 /* Determine divisor based on baud rate */
2023 baud = tty_get_baud_rate(tty);
2024
2025 if (!baud) {
2026 /* pick a default, any default... */
2027 dbg("%s", "Picked default baud...");
2028 baud = 9600;
2029 }
2030
2031 dbg("%s - baud rate = %d", __func__, baud);
2032 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2033
2034 /* Enable Interrupts */
2035 Data = 0x0c;
2036 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2037
2038 if (mos7840_port->read_urb_busy == false) {
2039 mos7840_port->read_urb->dev = serial->dev;
2040 mos7840_port->read_urb_busy = true;
2041 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2042 if (status) {
2043 dbg("usb_submit_urb(read bulk) failed, status = %d",
2044 status);
2045 mos7840_port->read_urb_busy = false;
2046 }
2047 }
2048 wake_up(&mos7840_port->delta_msr_wait);
2049 mos7840_port->delta_msr_cond = 1;
2050 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2051 mos7840_port->shadowLCR);
2052
2053 return;
2054 }
2055
2056 /*****************************************************************************
2057 * mos7840_set_termios
2058 * this function is called by the tty driver when it wants to change
2059 * the termios structure
2060 *****************************************************************************/
2061
2062 static void mos7840_set_termios(struct tty_struct *tty,
2063 struct usb_serial_port *port,
2064 struct ktermios *old_termios)
2065 {
2066 int status;
2067 unsigned int cflag;
2068 struct usb_serial *serial;
2069 struct moschip_port *mos7840_port;
2070 dbg("mos7840_set_termios: START");
2071 if (mos7840_port_paranoia_check(port, __func__)) {
2072 dbg("%s", "Invalid port");
2073 return;
2074 }
2075
2076 serial = port->serial;
2077
2078 if (mos7840_serial_paranoia_check(serial, __func__)) {
2079 dbg("%s", "Invalid Serial");
2080 return;
2081 }
2082
2083 mos7840_port = mos7840_get_port_private(port);
2084
2085 if (mos7840_port == NULL)
2086 return;
2087
2088 if (!mos7840_port->open) {
2089 dbg("%s - port not opened", __func__);
2090 return;
2091 }
2092
2093 dbg("%s", "setting termios - ");
2094
2095 cflag = tty->termios->c_cflag;
2096
2097 dbg("%s - clfag %08x iflag %08x", __func__,
2098 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2099 dbg("%s - old clfag %08x old iflag %08x", __func__,
2100 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2101 dbg("%s - port %d", __func__, port->number);
2102
2103 /* change the port settings to the new ones specified */
2104
2105 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2106
2107 if (!mos7840_port->read_urb) {
2108 dbg("%s", "URB KILLED !!!!!");
2109 return;
2110 }
2111
2112 if (mos7840_port->read_urb_busy == false) {
2113 mos7840_port->read_urb->dev = serial->dev;
2114 mos7840_port->read_urb_busy = true;
2115 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2116 if (status) {
2117 dbg("usb_submit_urb(read bulk) failed, status = %d",
2118 status);
2119 mos7840_port->read_urb_busy = false;
2120 }
2121 }
2122 return;
2123 }
2124
2125 /*****************************************************************************
2126 * mos7840_get_lsr_info - get line status register info
2127 *
2128 * Purpose: Let user call ioctl() to get info when the UART physically
2129 * is emptied. On bus types like RS485, the transmitter must
2130 * release the bus after transmitting. This must be done when
2131 * the transmit shift register is empty, not be done when the
2132 * transmit holding register is empty. This functionality
2133 * allows an RS485 driver to be written in user space.
2134 *****************************************************************************/
2135
2136 static int mos7840_get_lsr_info(struct tty_struct *tty,
2137 unsigned int __user *value)
2138 {
2139 int count;
2140 unsigned int result = 0;
2141
2142 count = mos7840_chars_in_buffer(tty);
2143 if (count == 0) {
2144 dbg("%s -- Empty", __func__);
2145 result = TIOCSER_TEMT;
2146 }
2147
2148 if (copy_to_user(value, &result, sizeof(int)))
2149 return -EFAULT;
2150 return 0;
2151 }
2152
2153 /*****************************************************************************
2154 * mos7840_get_serial_info
2155 * function to get information about serial port
2156 *****************************************************************************/
2157
2158 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2159 struct serial_struct __user *retinfo)
2160 {
2161 struct serial_struct tmp;
2162
2163 if (mos7840_port == NULL)
2164 return -1;
2165
2166 if (!retinfo)
2167 return -EFAULT;
2168
2169 memset(&tmp, 0, sizeof(tmp));
2170
2171 tmp.type = PORT_16550A;
2172 tmp.line = mos7840_port->port->serial->minor;
2173 tmp.port = mos7840_port->port->number;
2174 tmp.irq = 0;
2175 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2176 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2177 tmp.baud_base = 9600;
2178 tmp.close_delay = 5 * HZ;
2179 tmp.closing_wait = 30 * HZ;
2180
2181 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2182 return -EFAULT;
2183 return 0;
2184 }
2185
2186 /*****************************************************************************
2187 * SerialIoctl
2188 * this function handles any ioctl calls to the driver
2189 *****************************************************************************/
2190
2191 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2192 unsigned int cmd, unsigned long arg)
2193 {
2194 struct usb_serial_port *port = tty->driver_data;
2195 void __user *argp = (void __user *)arg;
2196 struct moschip_port *mos7840_port;
2197
2198 struct async_icount cnow;
2199 struct async_icount cprev;
2200 struct serial_icounter_struct icount;
2201
2202 if (mos7840_port_paranoia_check(port, __func__)) {
2203 dbg("%s", "Invalid port");
2204 return -1;
2205 }
2206
2207 mos7840_port = mos7840_get_port_private(port);
2208
2209 if (mos7840_port == NULL)
2210 return -1;
2211
2212 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2213
2214 switch (cmd) {
2215 /* return number of bytes available */
2216
2217 case TIOCSERGETLSR:
2218 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2219 return mos7840_get_lsr_info(tty, argp);
2220 return 0;
2221
2222 case TIOCGSERIAL:
2223 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2224 return mos7840_get_serial_info(mos7840_port, argp);
2225
2226 case TIOCSSERIAL:
2227 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2228 break;
2229
2230 case TIOCMIWAIT:
2231 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2232 cprev = mos7840_port->icount;
2233 while (1) {
2234 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2235 mos7840_port->delta_msr_cond = 0;
2236 wait_event_interruptible(mos7840_port->delta_msr_wait,
2237 (mos7840_port->
2238 delta_msr_cond == 1));
2239
2240 /* see if a signal did it */
2241 if (signal_pending(current))
2242 return -ERESTARTSYS;
2243 cnow = mos7840_port->icount;
2244 smp_rmb();
2245 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2246 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2247 return -EIO; /* no change => error */
2248 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2249 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2250 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2251 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2252 return 0;
2253 }
2254 cprev = cnow;
2255 }
2256 /* NOTREACHED */
2257 break;
2258
2259 case TIOCGICOUNT:
2260 cnow = mos7840_port->icount;
2261 smp_rmb();
2262 icount.cts = cnow.cts;
2263 icount.dsr = cnow.dsr;
2264 icount.rng = cnow.rng;
2265 icount.dcd = cnow.dcd;
2266 icount.rx = cnow.rx;
2267 icount.tx = cnow.tx;
2268 icount.frame = cnow.frame;
2269 icount.overrun = cnow.overrun;
2270 icount.parity = cnow.parity;
2271 icount.brk = cnow.brk;
2272 icount.buf_overrun = cnow.buf_overrun;
2273
2274 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2275 port->number, icount.rx, icount.tx);
2276 if (copy_to_user(argp, &icount, sizeof(icount)))
2277 return -EFAULT;
2278 return 0;
2279 default:
2280 break;
2281 }
2282 return -ENOIOCTLCMD;
2283 }
2284
2285 static int mos7840_calc_num_ports(struct usb_serial *serial)
2286 {
2287 int mos7840_num_ports = 0;
2288
2289 dbg("numberofendpoints: cur %d, alt %d",
2290 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2291 (int)serial->interface->altsetting->desc.bNumEndpoints);
2292 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2293 mos7840_num_ports = serial->num_ports = 2;
2294 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2295 serial->num_bulk_in = 4;
2296 serial->num_bulk_out = 4;
2297 mos7840_num_ports = serial->num_ports = 4;
2298 }
2299 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2300 return mos7840_num_ports;
2301 }
2302
2303 /****************************************************************************
2304 * mos7840_startup
2305 ****************************************************************************/
2306
2307 static int mos7840_startup(struct usb_serial *serial)
2308 {
2309 struct moschip_port *mos7840_port;
2310 struct usb_device *dev;
2311 int i, status;
2312
2313 __u16 Data;
2314 dbg("%s", "mos7840_startup :Entering..........");
2315
2316 if (!serial) {
2317 dbg("%s", "Invalid Handler");
2318 return -1;
2319 }
2320
2321 dev = serial->dev;
2322
2323 dbg("%s", "Entering...");
2324 dbg ("mos7840_startup: serial = %p", serial);
2325
2326 /* we set up the pointers to the endpoints in the mos7840_open *
2327 * function, as the structures aren't created yet. */
2328
2329 /* set up port private structures */
2330 for (i = 0; i < serial->num_ports; ++i) {
2331 dbg ("mos7840_startup: configuring port %d............", i);
2332 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2333 if (mos7840_port == NULL) {
2334 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2335 status = -ENOMEM;
2336 i--; /* don't follow NULL pointer cleaning up */
2337 goto error;
2338 }
2339
2340 /* Initialize all port interrupt end point to port 0 int
2341 * endpoint. Our device has only one interrupt end point
2342 * common to all port */
2343
2344 mos7840_port->port = serial->port[i];
2345 mos7840_set_port_private(serial->port[i], mos7840_port);
2346 spin_lock_init(&mos7840_port->pool_lock);
2347
2348 /* minor is not initialised until later by
2349 * usb-serial.c:get_free_serial() and cannot therefore be used
2350 * to index device instances */
2351 mos7840_port->port_num = i + 1;
2352 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2353 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2354 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2355 dbg ("serial->minor = %d", serial->minor);
2356
2357 if (mos7840_port->port_num == 1) {
2358 mos7840_port->SpRegOffset = 0x0;
2359 mos7840_port->ControlRegOffset = 0x1;
2360 mos7840_port->DcrRegOffset = 0x4;
2361 } else if ((mos7840_port->port_num == 2)
2362 && (serial->num_ports == 4)) {
2363 mos7840_port->SpRegOffset = 0x8;
2364 mos7840_port->ControlRegOffset = 0x9;
2365 mos7840_port->DcrRegOffset = 0x16;
2366 } else if ((mos7840_port->port_num == 2)
2367 && (serial->num_ports == 2)) {
2368 mos7840_port->SpRegOffset = 0xa;
2369 mos7840_port->ControlRegOffset = 0xb;
2370 mos7840_port->DcrRegOffset = 0x19;
2371 } else if ((mos7840_port->port_num == 3)
2372 && (serial->num_ports == 4)) {
2373 mos7840_port->SpRegOffset = 0xa;
2374 mos7840_port->ControlRegOffset = 0xb;
2375 mos7840_port->DcrRegOffset = 0x19;
2376 } else if ((mos7840_port->port_num == 4)
2377 && (serial->num_ports == 4)) {
2378 mos7840_port->SpRegOffset = 0xc;
2379 mos7840_port->ControlRegOffset = 0xd;
2380 mos7840_port->DcrRegOffset = 0x1c;
2381 }
2382 mos7840_dump_serial_port(mos7840_port);
2383 mos7840_set_port_private(serial->port[i], mos7840_port);
2384
2385 /* enable rx_disable bit in control register */
2386 status = mos7840_get_reg_sync(serial->port[i],
2387 mos7840_port->ControlRegOffset, &Data);
2388 if (status < 0) {
2389 dbg("Reading ControlReg failed status-0x%x", status);
2390 break;
2391 } else
2392 dbg("ControlReg Reading success val is %x, status%d",
2393 Data, status);
2394 Data |= 0x08; /* setting driver done bit */
2395 Data |= 0x04; /* sp1_bit to have cts change reflect in
2396 modem status reg */
2397
2398 /* Data |= 0x20; //rx_disable bit */
2399 status = mos7840_set_reg_sync(serial->port[i],
2400 mos7840_port->ControlRegOffset, Data);
2401 if (status < 0) {
2402 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2403 break;
2404 } else
2405 dbg("ControlReg Writing success(rx_disable) status%d",
2406 status);
2407
2408 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2409 and 0x24 in DCR3 */
2410 Data = 0x01;
2411 status = mos7840_set_reg_sync(serial->port[i],
2412 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2413 if (status < 0) {
2414 dbg("Writing DCR0 failed status-0x%x", status);
2415 break;
2416 } else
2417 dbg("DCR0 Writing success status%d", status);
2418
2419 Data = 0x05;
2420 status = mos7840_set_reg_sync(serial->port[i],
2421 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2422 if (status < 0) {
2423 dbg("Writing DCR1 failed status-0x%x", status);
2424 break;
2425 } else
2426 dbg("DCR1 Writing success status%d", status);
2427
2428 Data = 0x24;
2429 status = mos7840_set_reg_sync(serial->port[i],
2430 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2431 if (status < 0) {
2432 dbg("Writing DCR2 failed status-0x%x", status);
2433 break;
2434 } else
2435 dbg("DCR2 Writing success status%d", status);
2436
2437 /* write values in clkstart0x0 and clkmulti 0x20 */
2438 Data = 0x0;
2439 status = mos7840_set_reg_sync(serial->port[i],
2440 CLK_START_VALUE_REGISTER, Data);
2441 if (status < 0) {
2442 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2443 break;
2444 } else
2445 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2446
2447 Data = 0x20;
2448 status = mos7840_set_reg_sync(serial->port[i],
2449 CLK_MULTI_REGISTER, Data);
2450 if (status < 0) {
2451 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2452 status);
2453 goto error;
2454 } else
2455 dbg("CLK_MULTI_REGISTER Writing success status%d",
2456 status);
2457
2458 /* write value 0x0 to scratchpad register */
2459 Data = 0x00;
2460 status = mos7840_set_uart_reg(serial->port[i],
2461 SCRATCH_PAD_REGISTER, Data);
2462 if (status < 0) {
2463 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2464 status);
2465 break;
2466 } else
2467 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2468 status);
2469
2470 /* Zero Length flag register */
2471 if ((mos7840_port->port_num != 1)
2472 && (serial->num_ports == 2)) {
2473
2474 Data = 0xff;
2475 status = mos7840_set_reg_sync(serial->port[i],
2476 (__u16) (ZLP_REG1 +
2477 ((__u16)mos7840_port->port_num)), Data);
2478 dbg("ZLIP offset %x",
2479 (__u16) (ZLP_REG1 +
2480 ((__u16) mos7840_port->port_num)));
2481 if (status < 0) {
2482 dbg("Writing ZLP_REG%d failed status-0x%x",
2483 i + 2, status);
2484 break;
2485 } else
2486 dbg("ZLP_REG%d Writing success status%d",
2487 i + 2, status);
2488 } else {
2489 Data = 0xff;
2490 status = mos7840_set_reg_sync(serial->port[i],
2491 (__u16) (ZLP_REG1 +
2492 ((__u16)mos7840_port->port_num) - 0x1), Data);
2493 dbg("ZLIP offset %x",
2494 (__u16) (ZLP_REG1 +
2495 ((__u16) mos7840_port->port_num) - 0x1));
2496 if (status < 0) {
2497 dbg("Writing ZLP_REG%d failed status-0x%x",
2498 i + 1, status);
2499 break;
2500 } else
2501 dbg("ZLP_REG%d Writing success status%d",
2502 i + 1, status);
2503
2504 }
2505 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2506 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2507 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2508 GFP_KERNEL);
2509 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2510 !mos7840_port->dr) {
2511 status = -ENOMEM;
2512 goto error;
2513 }
2514 }
2515 dbg ("mos7840_startup: all ports configured...........");
2516
2517 /* Zero Length flag enable */
2518 Data = 0x0f;
2519 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2520 if (status < 0) {
2521 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2522 goto error;
2523 } else
2524 dbg("ZLP_REG5 Writing success status%d", status);
2525
2526 /* setting configuration feature to one */
2527 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2528 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2529 return 0;
2530 error:
2531 for (/* nothing */; i >= 0; i--) {
2532 mos7840_port = mos7840_get_port_private(serial->port[i]);
2533
2534 kfree(mos7840_port->dr);
2535 kfree(mos7840_port->ctrl_buf);
2536 usb_free_urb(mos7840_port->control_urb);
2537 kfree(mos7840_port);
2538 serial->port[i] = NULL;
2539 }
2540 return status;
2541 }
2542
2543 /****************************************************************************
2544 * mos7840_disconnect
2545 * This function is called whenever the device is removed from the usb bus.
2546 ****************************************************************************/
2547
2548 static void mos7840_disconnect(struct usb_serial *serial)
2549 {
2550 int i;
2551 unsigned long flags;
2552 struct moschip_port *mos7840_port;
2553 dbg("%s", " disconnect :entering..........");
2554
2555 if (!serial) {
2556 dbg("%s", "Invalid Handler");
2557 return;
2558 }
2559
2560 /* check for the ports to be closed,close the ports and disconnect */
2561
2562 /* free private structure allocated for serial port *
2563 * stop reads and writes on all ports */
2564
2565 for (i = 0; i < serial->num_ports; ++i) {
2566 mos7840_port = mos7840_get_port_private(serial->port[i]);
2567 dbg ("mos7840_port %d = %p", i, mos7840_port);
2568 if (mos7840_port) {
2569 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2570 mos7840_port->zombie = 1;
2571 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2572 usb_kill_urb(mos7840_port->control_urb);
2573 }
2574 }
2575
2576 dbg("%s", "Thank u :: ");
2577
2578 }
2579
2580 /****************************************************************************
2581 * mos7840_release
2582 * This function is called when the usb_serial structure is freed.
2583 ****************************************************************************/
2584
2585 static void mos7840_release(struct usb_serial *serial)
2586 {
2587 int i;
2588 struct moschip_port *mos7840_port;
2589 dbg("%s", " release :entering..........");
2590
2591 if (!serial) {
2592 dbg("%s", "Invalid Handler");
2593 return;
2594 }
2595
2596 /* check for the ports to be closed,close the ports and disconnect */
2597
2598 /* free private structure allocated for serial port *
2599 * stop reads and writes on all ports */
2600
2601 for (i = 0; i < serial->num_ports; ++i) {
2602 mos7840_port = mos7840_get_port_private(serial->port[i]);
2603 dbg("mos7840_port %d = %p", i, mos7840_port);
2604 if (mos7840_port) {
2605 kfree(mos7840_port->ctrl_buf);
2606 kfree(mos7840_port->dr);
2607 kfree(mos7840_port);
2608 }
2609 }
2610
2611 dbg("%s", "Thank u :: ");
2612
2613 }
2614
2615 static struct usb_driver io_driver = {
2616 .name = "mos7840",
2617 .probe = usb_serial_probe,
2618 .disconnect = usb_serial_disconnect,
2619 .id_table = moschip_id_table_combined,
2620 .no_dynamic_id = 1,
2621 };
2622
2623 static struct usb_serial_driver moschip7840_4port_device = {
2624 .driver = {
2625 .owner = THIS_MODULE,
2626 .name = "mos7840",
2627 },
2628 .description = DRIVER_DESC,
2629 .usb_driver = &io_driver,
2630 .id_table = moschip_port_id_table,
2631 .num_ports = 4,
2632 .open = mos7840_open,
2633 .close = mos7840_close,
2634 .write = mos7840_write,
2635 .write_room = mos7840_write_room,
2636 .chars_in_buffer = mos7840_chars_in_buffer,
2637 .throttle = mos7840_throttle,
2638 .unthrottle = mos7840_unthrottle,
2639 .calc_num_ports = mos7840_calc_num_ports,
2640 #ifdef MCSSerialProbe
2641 .probe = mos7840_serial_probe,
2642 #endif
2643 .ioctl = mos7840_ioctl,
2644 .set_termios = mos7840_set_termios,
2645 .break_ctl = mos7840_break,
2646 .tiocmget = mos7840_tiocmget,
2647 .tiocmset = mos7840_tiocmset,
2648 .attach = mos7840_startup,
2649 .disconnect = mos7840_disconnect,
2650 .release = mos7840_release,
2651 .read_bulk_callback = mos7840_bulk_in_callback,
2652 .read_int_callback = mos7840_interrupt_callback,
2653 };
2654
2655 /****************************************************************************
2656 * moschip7840_init
2657 * This is called by the module subsystem, or on startup to initialize us
2658 ****************************************************************************/
2659 static int __init moschip7840_init(void)
2660 {
2661 int retval;
2662
2663 dbg("%s", " mos7840_init :entering..........");
2664
2665 /* Register with the usb serial */
2666 retval = usb_serial_register(&moschip7840_4port_device);
2667
2668 if (retval)
2669 goto failed_port_device_register;
2670
2671 dbg("%s", "Entering...");
2672 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2673 DRIVER_DESC "\n");
2674
2675 /* Register with the usb */
2676 retval = usb_register(&io_driver);
2677 if (retval == 0) {
2678 dbg("%s", "Leaving...");
2679 return 0;
2680 }
2681 usb_serial_deregister(&moschip7840_4port_device);
2682 failed_port_device_register:
2683 return retval;
2684 }
2685
2686 /****************************************************************************
2687 * moschip7840_exit
2688 * Called when the driver is about to be unloaded.
2689 ****************************************************************************/
2690 static void __exit moschip7840_exit(void)
2691 {
2692
2693 dbg("%s", " mos7840_exit :entering..........");
2694
2695 usb_deregister(&io_driver);
2696
2697 usb_serial_deregister(&moschip7840_4port_device);
2698
2699 dbg("%s", "Entering...");
2700 }
2701
2702 module_init(moschip7840_init);
2703 module_exit(moschip7840_exit);
2704
2705 /* Module information */
2706 MODULE_DESCRIPTION(DRIVER_DESC);
2707 MODULE_LICENSE("GPL");
2708
2709 module_param(debug, bool, S_IRUGO | S_IWUSR);
2710 MODULE_PARM_DESC(debug, "Debug enabled or not");
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