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USB: tty: Prune uses of tty_request_room in the USB layer
[deliverable/linux.git] / drivers / usb / serial / spcp8x5.c
1 /*
2 * spcp8x5 USB to serial adaptor driver
3 *
4 * Copyright (C) 2006 Linxb (xubin.lin@worldplus.com.cn)
5 * Copyright (C) 2006 S1 Corp.
6 *
7 * Original driver for 2.6.10 pl2303 driver by
8 * Greg Kroah-Hartman (greg@kroah.com)
9 * Changes for 2.6.20 by Harald Klein <hari@vt100.at>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 *
17 */
18 #include <linux/kernel.h>
19 #include <linux/errno.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/tty.h>
23 #include <linux/tty_driver.h>
24 #include <linux/tty_flip.h>
25 #include <linux/module.h>
26 #include <linux/spinlock.h>
27 #include <linux/usb.h>
28 #include <linux/usb/serial.h>
29
30
31 /* Version Information */
32 #define DRIVER_VERSION "v0.04"
33 #define DRIVER_DESC "SPCP8x5 USB to serial adaptor driver"
34
35 static int debug;
36
37 #define SPCP8x5_007_VID 0x04FC
38 #define SPCP8x5_007_PID 0x0201
39 #define SPCP8x5_008_VID 0x04fc
40 #define SPCP8x5_008_PID 0x0235
41 #define SPCP8x5_PHILIPS_VID 0x0471
42 #define SPCP8x5_PHILIPS_PID 0x081e
43 #define SPCP8x5_INTERMATIC_VID 0x04FC
44 #define SPCP8x5_INTERMATIC_PID 0x0204
45 #define SPCP8x5_835_VID 0x04fc
46 #define SPCP8x5_835_PID 0x0231
47
48 static const struct usb_device_id id_table[] = {
49 { USB_DEVICE(SPCP8x5_PHILIPS_VID , SPCP8x5_PHILIPS_PID)},
50 { USB_DEVICE(SPCP8x5_INTERMATIC_VID, SPCP8x5_INTERMATIC_PID)},
51 { USB_DEVICE(SPCP8x5_835_VID, SPCP8x5_835_PID)},
52 { USB_DEVICE(SPCP8x5_008_VID, SPCP8x5_008_PID)},
53 { USB_DEVICE(SPCP8x5_007_VID, SPCP8x5_007_PID)},
54 { } /* Terminating entry */
55 };
56 MODULE_DEVICE_TABLE(usb, id_table);
57
58 struct spcp8x5_usb_ctrl_arg {
59 u8 type;
60 u8 cmd;
61 u8 cmd_type;
62 u16 value;
63 u16 index;
64 u16 length;
65 };
66
67 /* wait 30s before close */
68 #define SPCP8x5_CLOSING_WAIT (30*HZ)
69
70 #define SPCP8x5_BUF_SIZE 1024
71
72
73 /* spcp8x5 spec register define */
74 #define MCR_CONTROL_LINE_RTS 0x02
75 #define MCR_CONTROL_LINE_DTR 0x01
76 #define MCR_DTR 0x01
77 #define MCR_RTS 0x02
78
79 #define MSR_STATUS_LINE_DCD 0x80
80 #define MSR_STATUS_LINE_RI 0x40
81 #define MSR_STATUS_LINE_DSR 0x20
82 #define MSR_STATUS_LINE_CTS 0x10
83
84 /* verdor command here , we should define myself */
85 #define SET_DEFAULT 0x40
86 #define SET_DEFAULT_TYPE 0x20
87
88 #define SET_UART_FORMAT 0x40
89 #define SET_UART_FORMAT_TYPE 0x21
90 #define SET_UART_FORMAT_SIZE_5 0x00
91 #define SET_UART_FORMAT_SIZE_6 0x01
92 #define SET_UART_FORMAT_SIZE_7 0x02
93 #define SET_UART_FORMAT_SIZE_8 0x03
94 #define SET_UART_FORMAT_STOP_1 0x00
95 #define SET_UART_FORMAT_STOP_2 0x04
96 #define SET_UART_FORMAT_PAR_NONE 0x00
97 #define SET_UART_FORMAT_PAR_ODD 0x10
98 #define SET_UART_FORMAT_PAR_EVEN 0x30
99 #define SET_UART_FORMAT_PAR_MASK 0xD0
100 #define SET_UART_FORMAT_PAR_SPACE 0x90
101
102 #define GET_UART_STATUS_TYPE 0xc0
103 #define GET_UART_STATUS 0x22
104 #define GET_UART_STATUS_MSR 0x06
105
106 #define SET_UART_STATUS 0x40
107 #define SET_UART_STATUS_TYPE 0x23
108 #define SET_UART_STATUS_MCR 0x0004
109 #define SET_UART_STATUS_MCR_DTR 0x01
110 #define SET_UART_STATUS_MCR_RTS 0x02
111 #define SET_UART_STATUS_MCR_LOOP 0x10
112
113 #define SET_WORKING_MODE 0x40
114 #define SET_WORKING_MODE_TYPE 0x24
115 #define SET_WORKING_MODE_U2C 0x00
116 #define SET_WORKING_MODE_RS485 0x01
117 #define SET_WORKING_MODE_PDMA 0x02
118 #define SET_WORKING_MODE_SPP 0x03
119
120 #define SET_FLOWCTL_CHAR 0x40
121 #define SET_FLOWCTL_CHAR_TYPE 0x25
122
123 #define GET_VERSION 0xc0
124 #define GET_VERSION_TYPE 0x26
125
126 #define SET_REGISTER 0x40
127 #define SET_REGISTER_TYPE 0x27
128
129 #define GET_REGISTER 0xc0
130 #define GET_REGISTER_TYPE 0x28
131
132 #define SET_RAM 0x40
133 #define SET_RAM_TYPE 0x31
134
135 #define GET_RAM 0xc0
136 #define GET_RAM_TYPE 0x32
137
138 /* how come ??? */
139 #define UART_STATE 0x08
140 #define UART_STATE_TRANSIENT_MASK 0x74
141 #define UART_DCD 0x01
142 #define UART_DSR 0x02
143 #define UART_BREAK_ERROR 0x04
144 #define UART_RING 0x08
145 #define UART_FRAME_ERROR 0x10
146 #define UART_PARITY_ERROR 0x20
147 #define UART_OVERRUN_ERROR 0x40
148 #define UART_CTS 0x80
149
150 enum spcp8x5_type {
151 SPCP825_007_TYPE,
152 SPCP825_008_TYPE,
153 SPCP825_PHILIP_TYPE,
154 SPCP825_INTERMATIC_TYPE,
155 SPCP835_TYPE,
156 };
157
158 /* 1st in 1st out buffer 4 driver */
159 struct ringbuf {
160 unsigned int buf_size;
161 char *buf_buf;
162 char *buf_get;
163 char *buf_put;
164 };
165
166 /* alloc the ring buf and alloc the buffer itself */
167 static inline struct ringbuf *alloc_ringbuf(unsigned int size)
168 {
169 struct ringbuf *pb;
170
171 if (size == 0)
172 return NULL;
173
174 pb = kmalloc(sizeof(*pb), GFP_KERNEL);
175 if (pb == NULL)
176 return NULL;
177
178 pb->buf_buf = kmalloc(size, GFP_KERNEL);
179 if (pb->buf_buf == NULL) {
180 kfree(pb);
181 return NULL;
182 }
183
184 pb->buf_size = size;
185 pb->buf_get = pb->buf_put = pb->buf_buf;
186
187 return pb;
188 }
189
190 /* free the ring buf and the buffer itself */
191 static inline void free_ringbuf(struct ringbuf *pb)
192 {
193 if (pb != NULL) {
194 kfree(pb->buf_buf);
195 kfree(pb);
196 }
197 }
198
199 /* clear pipo , juest repoint the pointer here */
200 static inline void clear_ringbuf(struct ringbuf *pb)
201 {
202 if (pb != NULL)
203 pb->buf_get = pb->buf_put;
204 }
205
206 /* get the number of data in the pipo */
207 static inline unsigned int ringbuf_avail_data(struct ringbuf *pb)
208 {
209 if (pb == NULL)
210 return 0;
211 return (pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size;
212 }
213
214 /* get the number of space in the pipo */
215 static inline unsigned int ringbuf_avail_space(struct ringbuf *pb)
216 {
217 if (pb == NULL)
218 return 0;
219 return (pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size;
220 }
221
222 /* put count data into pipo */
223 static unsigned int put_ringbuf(struct ringbuf *pb, const char *buf,
224 unsigned int count)
225 {
226 unsigned int len;
227
228 if (pb == NULL)
229 return 0;
230
231 len = ringbuf_avail_space(pb);
232 if (count > len)
233 count = len;
234
235 if (count == 0)
236 return 0;
237
238 len = pb->buf_buf + pb->buf_size - pb->buf_put;
239 if (count > len) {
240 memcpy(pb->buf_put, buf, len);
241 memcpy(pb->buf_buf, buf+len, count - len);
242 pb->buf_put = pb->buf_buf + count - len;
243 } else {
244 memcpy(pb->buf_put, buf, count);
245 if (count < len)
246 pb->buf_put += count;
247 else /* count == len */
248 pb->buf_put = pb->buf_buf;
249 }
250 return count;
251 }
252
253 /* get count data from pipo */
254 static unsigned int get_ringbuf(struct ringbuf *pb, char *buf,
255 unsigned int count)
256 {
257 unsigned int len;
258
259 if (pb == NULL || buf == NULL)
260 return 0;
261
262 len = ringbuf_avail_data(pb);
263 if (count > len)
264 count = len;
265
266 if (count == 0)
267 return 0;
268
269 len = pb->buf_buf + pb->buf_size - pb->buf_get;
270 if (count > len) {
271 memcpy(buf, pb->buf_get, len);
272 memcpy(buf+len, pb->buf_buf, count - len);
273 pb->buf_get = pb->buf_buf + count - len;
274 } else {
275 memcpy(buf, pb->buf_get, count);
276 if (count < len)
277 pb->buf_get += count;
278 else /* count == len */
279 pb->buf_get = pb->buf_buf;
280 }
281
282 return count;
283 }
284
285 static struct usb_driver spcp8x5_driver = {
286 .name = "spcp8x5",
287 .probe = usb_serial_probe,
288 .disconnect = usb_serial_disconnect,
289 .id_table = id_table,
290 .no_dynamic_id = 1,
291 };
292
293
294 struct spcp8x5_private {
295 spinlock_t lock;
296 struct ringbuf *buf;
297 int write_urb_in_use;
298 enum spcp8x5_type type;
299 wait_queue_head_t delta_msr_wait;
300 u8 line_control;
301 u8 line_status;
302 };
303
304 /* desc : when device plug in,this function would be called.
305 * thanks to usb_serial subsystem,then do almost every things for us. And what
306 * we should do just alloc the buffer */
307 static int spcp8x5_startup(struct usb_serial *serial)
308 {
309 struct spcp8x5_private *priv;
310 int i;
311 enum spcp8x5_type type = SPCP825_007_TYPE;
312 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
313
314 if (product == 0x0201)
315 type = SPCP825_007_TYPE;
316 else if (product == 0x0231)
317 type = SPCP835_TYPE;
318 else if (product == 0x0235)
319 type = SPCP825_008_TYPE;
320 else if (product == 0x0204)
321 type = SPCP825_INTERMATIC_TYPE;
322 else if (product == 0x0471 &&
323 serial->dev->descriptor.idVendor == cpu_to_le16(0x081e))
324 type = SPCP825_PHILIP_TYPE;
325 dev_dbg(&serial->dev->dev, "device type = %d\n", (int)type);
326
327 for (i = 0; i < serial->num_ports; ++i) {
328 priv = kzalloc(sizeof(struct spcp8x5_private), GFP_KERNEL);
329 if (!priv)
330 goto cleanup;
331
332 spin_lock_init(&priv->lock);
333 priv->buf = alloc_ringbuf(SPCP8x5_BUF_SIZE);
334 if (priv->buf == NULL)
335 goto cleanup2;
336
337 init_waitqueue_head(&priv->delta_msr_wait);
338 priv->type = type;
339 usb_set_serial_port_data(serial->port[i] , priv);
340
341 }
342
343 return 0;
344
345 cleanup2:
346 kfree(priv);
347 cleanup:
348 for (--i; i >= 0; --i) {
349 priv = usb_get_serial_port_data(serial->port[i]);
350 free_ringbuf(priv->buf);
351 kfree(priv);
352 usb_set_serial_port_data(serial->port[i] , NULL);
353 }
354 return -ENOMEM;
355 }
356
357 /* call when the device plug out. free all the memory alloced by probe */
358 static void spcp8x5_release(struct usb_serial *serial)
359 {
360 int i;
361 struct spcp8x5_private *priv;
362
363 for (i = 0; i < serial->num_ports; i++) {
364 priv = usb_get_serial_port_data(serial->port[i]);
365 if (priv) {
366 free_ringbuf(priv->buf);
367 kfree(priv);
368 }
369 }
370 }
371
372 /* set the modem control line of the device.
373 * NOTE spcp825-007 not supported this */
374 static int spcp8x5_set_ctrlLine(struct usb_device *dev, u8 value,
375 enum spcp8x5_type type)
376 {
377 int retval;
378 u8 mcr = 0 ;
379
380 if (type == SPCP825_007_TYPE)
381 return -EPERM;
382
383 mcr = (unsigned short)value;
384 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
385 SET_UART_STATUS_TYPE, SET_UART_STATUS,
386 mcr, 0x04, NULL, 0, 100);
387 if (retval != 0)
388 dev_dbg(&dev->dev, "usb_control_msg return %#x\n", retval);
389 return retval;
390 }
391
392 /* get the modem status register of the device
393 * NOTE spcp825-007 not supported this */
394 static int spcp8x5_get_msr(struct usb_device *dev, u8 *status,
395 enum spcp8x5_type type)
396 {
397 u8 *status_buffer;
398 int ret;
399
400 /* I return Permited not support here but seem inval device
401 * is more fix */
402 if (type == SPCP825_007_TYPE)
403 return -EPERM;
404 if (status == NULL)
405 return -EINVAL;
406
407 status_buffer = kmalloc(1, GFP_KERNEL);
408 if (!status_buffer)
409 return -ENOMEM;
410 status_buffer[0] = status[0];
411
412 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
413 GET_UART_STATUS, GET_UART_STATUS_TYPE,
414 0, GET_UART_STATUS_MSR, status_buffer, 1, 100);
415 if (ret < 0)
416 dev_dbg(&dev->dev, "Get MSR = 0x%p failed (error = %d)",
417 status_buffer, ret);
418
419 dev_dbg(&dev->dev, "0xc0:0x22:0:6 %d - 0x%p ", ret, status_buffer);
420 status[0] = status_buffer[0];
421 kfree(status_buffer);
422
423 return ret;
424 }
425
426 /* select the work mode.
427 * NOTE this function not supported by spcp825-007 */
428 static void spcp8x5_set_workMode(struct usb_device *dev, u16 value,
429 u16 index, enum spcp8x5_type type)
430 {
431 int ret;
432
433 /* I return Permited not support here but seem inval device
434 * is more fix */
435 if (type == SPCP825_007_TYPE)
436 return;
437
438 ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
439 SET_WORKING_MODE_TYPE, SET_WORKING_MODE,
440 value, index, NULL, 0, 100);
441 dev_dbg(&dev->dev, "value = %#x , index = %#x\n", value, index);
442 if (ret < 0)
443 dev_dbg(&dev->dev,
444 "RTSCTS usb_control_msg(enable flowctrl) = %d\n", ret);
445 }
446
447 static int spcp8x5_carrier_raised(struct usb_serial_port *port)
448 {
449 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
450 if (priv->line_status & MSR_STATUS_LINE_DCD)
451 return 1;
452 return 0;
453 }
454
455 static void spcp8x5_dtr_rts(struct usb_serial_port *port, int on)
456 {
457 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
458 unsigned long flags;
459 u8 control;
460
461 spin_lock_irqsave(&priv->lock, flags);
462 if (on)
463 priv->line_control = MCR_CONTROL_LINE_DTR
464 | MCR_CONTROL_LINE_RTS;
465 else
466 priv->line_control &= ~ (MCR_CONTROL_LINE_DTR
467 | MCR_CONTROL_LINE_RTS);
468 control = priv->line_control;
469 spin_unlock_irqrestore(&priv->lock, flags);
470 spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
471 }
472
473 /* close the serial port. We should wait for data sending to device 1st and
474 * then kill all urb. */
475 static void spcp8x5_close(struct usb_serial_port *port)
476 {
477 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
478 unsigned long flags;
479 int result;
480
481 dbg("%s - port %d", __func__, port->number);
482
483 spin_lock_irqsave(&priv->lock, flags);
484 /* clear out any remaining data in the buffer */
485 clear_ringbuf(priv->buf);
486 spin_unlock_irqrestore(&priv->lock, flags);
487
488 /* kill urb */
489 if (port->write_urb != NULL) {
490 result = usb_unlink_urb(port->write_urb);
491 if (result)
492 dev_dbg(&port->dev,
493 "usb_unlink_urb(write_urb) = %d\n", result);
494 }
495 result = usb_unlink_urb(port->read_urb);
496 if (result)
497 dev_dbg(&port->dev, "usb_unlink_urb(read_urb) = %d\n", result);
498 }
499
500 static void spcp8x5_init_termios(struct tty_struct *tty)
501 {
502 /* for the 1st time call this function */
503 *(tty->termios) = tty_std_termios;
504 tty->termios->c_cflag = B115200 | CS8 | CREAD | HUPCL | CLOCAL;
505 tty->termios->c_ispeed = 115200;
506 tty->termios->c_ospeed = 115200;
507 }
508
509 /* set the serial param for transfer. we should check if we really need to
510 * transfer. if we set flow control we should do this too. */
511 static void spcp8x5_set_termios(struct tty_struct *tty,
512 struct usb_serial_port *port, struct ktermios *old_termios)
513 {
514 struct usb_serial *serial = port->serial;
515 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
516 unsigned long flags;
517 unsigned int cflag = tty->termios->c_cflag;
518 unsigned int old_cflag = old_termios->c_cflag;
519 unsigned short uartdata;
520 unsigned char buf[2] = {0, 0};
521 int baud;
522 int i;
523 u8 control;
524
525
526 /* check that they really want us to change something */
527 if (!tty_termios_hw_change(tty->termios, old_termios))
528 return;
529
530 /* set DTR/RTS active */
531 spin_lock_irqsave(&priv->lock, flags);
532 control = priv->line_control;
533 if ((old_cflag & CBAUD) == B0) {
534 priv->line_control |= MCR_DTR;
535 if (!(old_cflag & CRTSCTS))
536 priv->line_control |= MCR_RTS;
537 }
538 if (control != priv->line_control) {
539 control = priv->line_control;
540 spin_unlock_irqrestore(&priv->lock, flags);
541 spcp8x5_set_ctrlLine(serial->dev, control , priv->type);
542 } else {
543 spin_unlock_irqrestore(&priv->lock, flags);
544 }
545
546 /* Set Baud Rate */
547 baud = tty_get_baud_rate(tty);
548 switch (baud) {
549 case 300: buf[0] = 0x00; break;
550 case 600: buf[0] = 0x01; break;
551 case 1200: buf[0] = 0x02; break;
552 case 2400: buf[0] = 0x03; break;
553 case 4800: buf[0] = 0x04; break;
554 case 9600: buf[0] = 0x05; break;
555 case 19200: buf[0] = 0x07; break;
556 case 38400: buf[0] = 0x09; break;
557 case 57600: buf[0] = 0x0a; break;
558 case 115200: buf[0] = 0x0b; break;
559 case 230400: buf[0] = 0x0c; break;
560 case 460800: buf[0] = 0x0d; break;
561 case 921600: buf[0] = 0x0e; break;
562 /* case 1200000: buf[0] = 0x0f; break; */
563 /* case 2400000: buf[0] = 0x10; break; */
564 case 3000000: buf[0] = 0x11; break;
565 /* case 6000000: buf[0] = 0x12; break; */
566 case 0:
567 case 1000000:
568 buf[0] = 0x0b; break;
569 default:
570 dev_err(&port->dev, "spcp825 driver does not support the "
571 "baudrate requested, using default of 9600.\n");
572 }
573
574 /* Set Data Length : 00:5bit, 01:6bit, 10:7bit, 11:8bit */
575 if (cflag & CSIZE) {
576 switch (cflag & CSIZE) {
577 case CS5:
578 buf[1] |= SET_UART_FORMAT_SIZE_5;
579 break;
580 case CS6:
581 buf[1] |= SET_UART_FORMAT_SIZE_6;
582 break;
583 case CS7:
584 buf[1] |= SET_UART_FORMAT_SIZE_7;
585 break;
586 default:
587 case CS8:
588 buf[1] |= SET_UART_FORMAT_SIZE_8;
589 break;
590 }
591 }
592
593 /* Set Stop bit2 : 0:1bit 1:2bit */
594 buf[1] |= (cflag & CSTOPB) ? SET_UART_FORMAT_STOP_2 :
595 SET_UART_FORMAT_STOP_1;
596
597 /* Set Parity bit3-4 01:Odd 11:Even */
598 if (cflag & PARENB) {
599 buf[1] |= (cflag & PARODD) ?
600 SET_UART_FORMAT_PAR_ODD : SET_UART_FORMAT_PAR_EVEN ;
601 } else
602 buf[1] |= SET_UART_FORMAT_PAR_NONE;
603
604 uartdata = buf[0] | buf[1]<<8;
605
606 i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
607 SET_UART_FORMAT_TYPE, SET_UART_FORMAT,
608 uartdata, 0, NULL, 0, 100);
609 if (i < 0)
610 dev_err(&port->dev, "Set UART format %#x failed (error = %d)\n",
611 uartdata, i);
612 dbg("0x21:0x40:0:0 %d", i);
613
614 if (cflag & CRTSCTS) {
615 /* enable hardware flow control */
616 spcp8x5_set_workMode(serial->dev, 0x000a,
617 SET_WORKING_MODE_U2C, priv->type);
618 }
619 return;
620 }
621
622 /* open the serial port. do some usb system call. set termios and get the line
623 * status of the device. then submit the read urb */
624 static int spcp8x5_open(struct tty_struct *tty, struct usb_serial_port *port)
625 {
626 struct ktermios tmp_termios;
627 struct usb_serial *serial = port->serial;
628 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
629 int ret;
630 unsigned long flags;
631 u8 status = 0x30;
632 /* status 0x30 means DSR and CTS = 1 other CDC RI and delta = 0 */
633
634 dbg("%s - port %d", __func__, port->number);
635
636 usb_clear_halt(serial->dev, port->write_urb->pipe);
637 usb_clear_halt(serial->dev, port->read_urb->pipe);
638
639 ret = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
640 0x09, 0x00,
641 0x01, 0x00, NULL, 0x00, 100);
642 if (ret)
643 return ret;
644
645 spcp8x5_set_ctrlLine(serial->dev, priv->line_control , priv->type);
646
647 /* Setup termios */
648 if (tty)
649 spcp8x5_set_termios(tty, port, &tmp_termios);
650
651 spcp8x5_get_msr(serial->dev, &status, priv->type);
652
653 /* may be we should update uart status here but now we did not do */
654 spin_lock_irqsave(&priv->lock, flags);
655 priv->line_status = status & 0xf0 ;
656 spin_unlock_irqrestore(&priv->lock, flags);
657
658 dbg("%s - submitting read urb", __func__);
659 port->read_urb->dev = serial->dev;
660 ret = usb_submit_urb(port->read_urb, GFP_KERNEL);
661 if (ret) {
662 spcp8x5_close(port);
663 return -EPROTO;
664 }
665 port->port.drain_delay = 256;
666 return 0;
667 }
668
669 /* bulk read call back function. check the status of the urb. if transfer
670 * failed return. then update the status and the tty send data to tty subsys.
671 * submit urb again.
672 */
673 static void spcp8x5_read_bulk_callback(struct urb *urb)
674 {
675 struct usb_serial_port *port = urb->context;
676 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
677 struct tty_struct *tty;
678 unsigned char *data = urb->transfer_buffer;
679 unsigned long flags;
680 int result = urb->status;
681 u8 status;
682 char tty_flag;
683
684 dev_dbg(&port->dev, "start, result = %d, urb->actual_length = %d\n,",
685 result, urb->actual_length);
686
687 /* check the urb status */
688 if (result) {
689 if (!port->port.count)
690 return;
691 if (result == -EPROTO) {
692 /* spcp8x5 mysteriously fails with -EPROTO */
693 /* reschedule the read */
694 urb->dev = port->serial->dev;
695 result = usb_submit_urb(urb , GFP_ATOMIC);
696 if (result)
697 dev_dbg(&port->dev,
698 "failed submitting read urb %d\n",
699 result);
700 return;
701 }
702 dev_dbg(&port->dev, "unable to handle the error, exiting.\n");
703 return;
704 }
705
706 /* get tty_flag from status */
707 tty_flag = TTY_NORMAL;
708
709 spin_lock_irqsave(&priv->lock, flags);
710 status = priv->line_status;
711 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
712 spin_unlock_irqrestore(&priv->lock, flags);
713 /* wake up the wait for termios */
714 wake_up_interruptible(&priv->delta_msr_wait);
715
716 /* break takes precedence over parity, which takes precedence over
717 * framing errors */
718 if (status & UART_BREAK_ERROR)
719 tty_flag = TTY_BREAK;
720 else if (status & UART_PARITY_ERROR)
721 tty_flag = TTY_PARITY;
722 else if (status & UART_FRAME_ERROR)
723 tty_flag = TTY_FRAME;
724 dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
725
726 tty = tty_port_tty_get(&port->port);
727 if (tty && urb->actual_length) {
728 /* overrun is special, not associated with a char */
729 if (status & UART_OVERRUN_ERROR)
730 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
731 tty_insert_flip_string_fixed_flag(tty, data,
732 urb->actual_length, tty_flag);
733 tty_flip_buffer_push(tty);
734 }
735 tty_kref_put(tty);
736
737 /* Schedule the next read _if_ we are still open */
738 if (port->port.count) {
739 urb->dev = port->serial->dev;
740 result = usb_submit_urb(urb , GFP_ATOMIC);
741 if (result)
742 dev_dbg(&port->dev, "failed submitting read urb %d\n",
743 result);
744 }
745
746 return;
747 }
748
749 /* get data from ring buffer and then write to usb bus */
750 static void spcp8x5_send(struct usb_serial_port *port)
751 {
752 int count, result;
753 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
754 unsigned long flags;
755
756 spin_lock_irqsave(&priv->lock, flags);
757
758 if (priv->write_urb_in_use) {
759 dev_dbg(&port->dev, "write urb still used\n");
760 spin_unlock_irqrestore(&priv->lock, flags);
761 return;
762 }
763
764 /* send the 1st urb for writting */
765 memset(port->write_urb->transfer_buffer , 0x00 , port->bulk_out_size);
766 count = get_ringbuf(priv->buf, port->write_urb->transfer_buffer,
767 port->bulk_out_size);
768
769 if (count == 0) {
770 spin_unlock_irqrestore(&priv->lock, flags);
771 return;
772 }
773
774 /* update the urb status */
775 priv->write_urb_in_use = 1;
776
777 spin_unlock_irqrestore(&priv->lock, flags);
778
779 port->write_urb->transfer_buffer_length = count;
780 port->write_urb->dev = port->serial->dev;
781
782 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
783 if (result) {
784 dev_dbg(&port->dev, "failed submitting write urb, error %d\n",
785 result);
786 priv->write_urb_in_use = 0;
787 /* TODO: reschedule spcp8x5_send */
788 }
789
790
791 schedule_work(&port->work);
792 }
793
794 /* this is the call back function for write urb. NOTE we should not sleep in
795 * this routine. check the urb return code and then submit the write urb again
796 * to hold the write loop */
797 static void spcp8x5_write_bulk_callback(struct urb *urb)
798 {
799 struct usb_serial_port *port = urb->context;
800 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
801 int result;
802 int status = urb->status;
803
804 switch (status) {
805 case 0:
806 /* success */
807 break;
808 case -ECONNRESET:
809 case -ENOENT:
810 case -ESHUTDOWN:
811 /* this urb is terminated, clean up */
812 dev_dbg(&port->dev, "urb shutting down with status: %d\n",
813 status);
814 priv->write_urb_in_use = 0;
815 return;
816 default:
817 /* error in the urb, so we have to resubmit it */
818 dbg("%s - Overflow in write", __func__);
819 dbg("%s - nonzero write bulk status received: %d",
820 __func__, status);
821 port->write_urb->transfer_buffer_length = 1;
822 port->write_urb->dev = port->serial->dev;
823 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
824 if (result)
825 dev_dbg(&port->dev,
826 "failed resubmitting write urb %d\n", result);
827 else
828 return;
829 }
830
831 priv->write_urb_in_use = 0;
832
833 /* send any buffered data */
834 spcp8x5_send(port);
835 }
836
837 /* write data to ring buffer. and then start the write transfer */
838 static int spcp8x5_write(struct tty_struct *tty, struct usb_serial_port *port,
839 const unsigned char *buf, int count)
840 {
841 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
842 unsigned long flags;
843
844 dev_dbg(&port->dev, "%d bytes\n", count);
845
846 if (!count)
847 return count;
848
849 spin_lock_irqsave(&priv->lock, flags);
850 count = put_ringbuf(priv->buf, buf, count);
851 spin_unlock_irqrestore(&priv->lock, flags);
852
853 spcp8x5_send(port);
854
855 return count;
856 }
857
858 static int spcp8x5_wait_modem_info(struct usb_serial_port *port,
859 unsigned int arg)
860 {
861 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
862 unsigned long flags;
863 unsigned int prevstatus;
864 unsigned int status;
865 unsigned int changed;
866
867 spin_lock_irqsave(&priv->lock, flags);
868 prevstatus = priv->line_status;
869 spin_unlock_irqrestore(&priv->lock, flags);
870
871 while (1) {
872 /* wake up in bulk read */
873 interruptible_sleep_on(&priv->delta_msr_wait);
874
875 /* see if a signal did it */
876 if (signal_pending(current))
877 return -ERESTARTSYS;
878
879 spin_lock_irqsave(&priv->lock, flags);
880 status = priv->line_status;
881 spin_unlock_irqrestore(&priv->lock, flags);
882
883 changed = prevstatus^status;
884
885 if (((arg & TIOCM_RNG) && (changed & MSR_STATUS_LINE_RI)) ||
886 ((arg & TIOCM_DSR) && (changed & MSR_STATUS_LINE_DSR)) ||
887 ((arg & TIOCM_CD) && (changed & MSR_STATUS_LINE_DCD)) ||
888 ((arg & TIOCM_CTS) && (changed & MSR_STATUS_LINE_CTS)))
889 return 0;
890
891 prevstatus = status;
892 }
893 /* NOTREACHED */
894 return 0;
895 }
896
897 static int spcp8x5_ioctl(struct tty_struct *tty, struct file *file,
898 unsigned int cmd, unsigned long arg)
899 {
900 struct usb_serial_port *port = tty->driver_data;
901 dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
902
903 switch (cmd) {
904 case TIOCMIWAIT:
905 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
906 return spcp8x5_wait_modem_info(port, arg);
907
908 default:
909 dbg("%s not supported = 0x%04x", __func__, cmd);
910 break;
911 }
912
913 return -ENOIOCTLCMD;
914 }
915
916 static int spcp8x5_tiocmset(struct tty_struct *tty, struct file *file,
917 unsigned int set, unsigned int clear)
918 {
919 struct usb_serial_port *port = tty->driver_data;
920 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
921 unsigned long flags;
922 u8 control;
923
924 spin_lock_irqsave(&priv->lock, flags);
925 if (set & TIOCM_RTS)
926 priv->line_control |= MCR_RTS;
927 if (set & TIOCM_DTR)
928 priv->line_control |= MCR_DTR;
929 if (clear & TIOCM_RTS)
930 priv->line_control &= ~MCR_RTS;
931 if (clear & TIOCM_DTR)
932 priv->line_control &= ~MCR_DTR;
933 control = priv->line_control;
934 spin_unlock_irqrestore(&priv->lock, flags);
935
936 return spcp8x5_set_ctrlLine(port->serial->dev, control , priv->type);
937 }
938
939 static int spcp8x5_tiocmget(struct tty_struct *tty, struct file *file)
940 {
941 struct usb_serial_port *port = tty->driver_data;
942 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
943 unsigned long flags;
944 unsigned int mcr;
945 unsigned int status;
946 unsigned int result;
947
948 spin_lock_irqsave(&priv->lock, flags);
949 mcr = priv->line_control;
950 status = priv->line_status;
951 spin_unlock_irqrestore(&priv->lock, flags);
952
953 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
954 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
955 | ((status & MSR_STATUS_LINE_CTS) ? TIOCM_CTS : 0)
956 | ((status & MSR_STATUS_LINE_DSR) ? TIOCM_DSR : 0)
957 | ((status & MSR_STATUS_LINE_RI) ? TIOCM_RI : 0)
958 | ((status & MSR_STATUS_LINE_DCD) ? TIOCM_CD : 0);
959
960 return result;
961 }
962
963 /* get the avail space room in ring buffer */
964 static int spcp8x5_write_room(struct tty_struct *tty)
965 {
966 struct usb_serial_port *port = tty->driver_data;
967 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
968 int room = 0;
969 unsigned long flags;
970
971 spin_lock_irqsave(&priv->lock, flags);
972 room = ringbuf_avail_space(priv->buf);
973 spin_unlock_irqrestore(&priv->lock, flags);
974
975 return room;
976 }
977
978 /* get the number of avail data in write ring buffer */
979 static int spcp8x5_chars_in_buffer(struct tty_struct *tty)
980 {
981 struct usb_serial_port *port = tty->driver_data;
982 struct spcp8x5_private *priv = usb_get_serial_port_data(port);
983 int chars = 0;
984 unsigned long flags;
985
986 spin_lock_irqsave(&priv->lock, flags);
987 chars = ringbuf_avail_data(priv->buf);
988 spin_unlock_irqrestore(&priv->lock, flags);
989
990 return chars;
991 }
992
993 /* All of the device info needed for the spcp8x5 SIO serial converter */
994 static struct usb_serial_driver spcp8x5_device = {
995 .driver = {
996 .owner = THIS_MODULE,
997 .name = "SPCP8x5",
998 },
999 .id_table = id_table,
1000 .num_ports = 1,
1001 .open = spcp8x5_open,
1002 .close = spcp8x5_close,
1003 .dtr_rts = spcp8x5_dtr_rts,
1004 .carrier_raised = spcp8x5_carrier_raised,
1005 .write = spcp8x5_write,
1006 .set_termios = spcp8x5_set_termios,
1007 .init_termios = spcp8x5_init_termios,
1008 .ioctl = spcp8x5_ioctl,
1009 .tiocmget = spcp8x5_tiocmget,
1010 .tiocmset = spcp8x5_tiocmset,
1011 .write_room = spcp8x5_write_room,
1012 .read_bulk_callback = spcp8x5_read_bulk_callback,
1013 .write_bulk_callback = spcp8x5_write_bulk_callback,
1014 .chars_in_buffer = spcp8x5_chars_in_buffer,
1015 .attach = spcp8x5_startup,
1016 .release = spcp8x5_release,
1017 };
1018
1019 static int __init spcp8x5_init(void)
1020 {
1021 int retval;
1022 retval = usb_serial_register(&spcp8x5_device);
1023 if (retval)
1024 goto failed_usb_serial_register;
1025 retval = usb_register(&spcp8x5_driver);
1026 if (retval)
1027 goto failed_usb_register;
1028 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1029 DRIVER_DESC "\n");
1030 return 0;
1031 failed_usb_register:
1032 usb_serial_deregister(&spcp8x5_device);
1033 failed_usb_serial_register:
1034 return retval;
1035 }
1036
1037 static void __exit spcp8x5_exit(void)
1038 {
1039 usb_deregister(&spcp8x5_driver);
1040 usb_serial_deregister(&spcp8x5_device);
1041 }
1042
1043 module_init(spcp8x5_init);
1044 module_exit(spcp8x5_exit);
1045
1046 MODULE_DESCRIPTION(DRIVER_DESC);
1047 MODULE_VERSION(DRIVER_VERSION);
1048 MODULE_LICENSE("GPL");
1049
1050 module_param(debug, bool, S_IRUGO | S_IWUSR);
1051 MODULE_PARM_DESC(debug, "Debug enabled or not");
Linux kernel - Deliverables
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