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USB: pl2303: Removes unneeded goto.
[linux-block.git] / drivers / usb / serial / pl2303.c
CommitLineData
1da177e4
LT		 1/*
2 * Prolific PL2303 USB to serial adaptor driver
3 *
4 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2003 IBM Corp.
6 *
7 * Original driver for 2.2.x by anonymous
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
502b95c1 11 * the Free Software Foundation; either version 2 of the License.
1da177e4
LT		 12 *
13 * See Documentation/usb/usb-serial.txt for more information on using this driver
14 *
1da177e4
LT		 15 */
16
1da177e4
LT		 17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/tty.h>
22#include <linux/tty_driver.h>
23#include <linux/tty_flip.h>
24#include <linux/serial.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/spinlock.h>
28#include <asm/uaccess.h>
29#include <linux/usb.h>
a969888c 30#include <linux/usb/serial.h>
1da177e4
LT		 31#include "pl2303.h"
32
33/*
34 * Version Information
35 */
1da177e4
LT		 36#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
37
38static int debug;
39
40#define PL2303_CLOSING_WAIT (30*HZ)
41
42#define PL2303_BUF_SIZE 1024
43#define PL2303_TMP_BUF_SIZE 1024
44
1da177e4
LT		 45struct pl2303_buf {
46 unsigned int buf_size;
47 char *buf_buf;
48 char *buf_get;
49 char *buf_put;
50};
51
52static struct usb_device_id id_table [] = {
53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
54 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
3d861494 55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
1da177e4
LT		 56 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
57 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
58 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
59 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
60 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
61 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
62 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
63 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
58381719 64 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
1da177e4
LT		 65 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
66 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
67 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
68 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
69 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
70 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
71 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
72 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
a8310f3b 73 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
1da177e4 74 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
a8310f3b 75 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
acbb36f1 76 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
c6c27721
CL		 77 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
78 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
6cceb05f 79 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
c6c27721 80 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
491b04ce 81 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
3b928474 82 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
b7aa94b6 83 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
1da177e4
LT		 84 { } /* Terminating entry */
85};
86
87MODULE_DEVICE_TABLE (usb, id_table);
88
89static struct usb_driver pl2303_driver = {
1da177e4
LT		 90 .name = "pl2303",
91 .probe = usb_serial_probe,
92 .disconnect = usb_serial_disconnect,
93 .id_table = id_table,
ba9dc657 94 .no_dynamic_id = 1,
1da177e4
LT		 95};
96
97#define SET_LINE_REQUEST_TYPE 0x21
98#define SET_LINE_REQUEST 0x20
99
100#define SET_CONTROL_REQUEST_TYPE 0x21
101#define SET_CONTROL_REQUEST 0x22
102#define CONTROL_DTR 0x01
103#define CONTROL_RTS 0x02
104
105#define BREAK_REQUEST_TYPE 0x21
106#define BREAK_REQUEST 0x23
107#define BREAK_ON 0xffff
108#define BREAK_OFF 0x0000
109
110#define GET_LINE_REQUEST_TYPE 0xa1
111#define GET_LINE_REQUEST 0x21
112
113#define VENDOR_WRITE_REQUEST_TYPE 0x40
114#define VENDOR_WRITE_REQUEST 0x01
115
116#define VENDOR_READ_REQUEST_TYPE 0xc0
117#define VENDOR_READ_REQUEST 0x01
118
119#define UART_STATE 0x08
120#define UART_STATE_TRANSIENT_MASK 0x74
121#define UART_DCD 0x01
122#define UART_DSR 0x02
123#define UART_BREAK_ERROR 0x04
124#define UART_RING 0x08
125#define UART_FRAME_ERROR 0x10
126#define UART_PARITY_ERROR 0x20
127#define UART_OVERRUN_ERROR 0x40
128#define UART_CTS 0x80
129
130/* function prototypes for a PL2303 serial converter */
131static int pl2303_open (struct usb_serial_port *port, struct file *filp);
132static void pl2303_close (struct usb_serial_port *port, struct file *filp);
133static void pl2303_set_termios (struct usb_serial_port *port,
134 struct termios *old);
135static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
136 unsigned int cmd, unsigned long arg);
137static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
138static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
139static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
140static int pl2303_write (struct usb_serial_port *port,
141 const unsigned char *buf, int count);
142static void pl2303_send (struct usb_serial_port *port);
143static int pl2303_write_room(struct usb_serial_port *port);
144static int pl2303_chars_in_buffer(struct usb_serial_port *port);
145static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
146static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
147static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
148 unsigned int set, unsigned int clear);
149static int pl2303_startup (struct usb_serial *serial);
150static void pl2303_shutdown (struct usb_serial *serial);
151static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
152static void pl2303_buf_free(struct pl2303_buf *pb);
153static void pl2303_buf_clear(struct pl2303_buf *pb);
154static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
155static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
156static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
157 unsigned int count);
158static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
159 unsigned int count);
160
161
162/* All of the device info needed for the PL2303 SIO serial converter */
ea65370d 163static struct usb_serial_driver pl2303_device = {
18fcac35
GKH		 164 .driver = {
165 .owner = THIS_MODULE,
269bda1c 166 .name = "pl2303",
18fcac35 167 },
1da177e4
LT		 168 .id_table = id_table,
169 .num_interrupt_in = NUM_DONT_CARE,
170 .num_bulk_in = 1,
171 .num_bulk_out = 1,
172 .num_ports = 1,
173 .open = pl2303_open,
174 .close = pl2303_close,
175 .write = pl2303_write,
176 .ioctl = pl2303_ioctl,
177 .break_ctl = pl2303_break_ctl,
178 .set_termios = pl2303_set_termios,
179 .tiocmget = pl2303_tiocmget,
180 .tiocmset = pl2303_tiocmset,
181 .read_bulk_callback = pl2303_read_bulk_callback,
182 .read_int_callback = pl2303_read_int_callback,
183 .write_bulk_callback = pl2303_write_bulk_callback,
184 .write_room = pl2303_write_room,
185 .chars_in_buffer = pl2303_chars_in_buffer,
186 .attach = pl2303_startup,
187 .shutdown = pl2303_shutdown,
188};
189
190enum pl2303_type {
191 type_0, /* don't know the difference between type 0 and */
192 type_1, /* type 1, until someone from prolific tells us... */
193 HX, /* HX version of the pl2303 chip */
194};
195
196struct pl2303_private {
197 spinlock_t lock;
198 struct pl2303_buf *buf;
199 int write_urb_in_use;
200 wait_queue_head_t delta_msr_wait;
201 u8 line_control;
202 u8 line_status;
203 u8 termios_initialized;
204 enum pl2303_type type;
205};
206
207
208static int pl2303_startup (struct usb_serial *serial)
209{
210 struct pl2303_private *priv;
211 enum pl2303_type type = type_0;
212 int i;
213
214 if (serial->dev->descriptor.bDeviceClass == 0x02)
215 type = type_0;
216 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
217 type = HX;
218 else if (serial->dev->descriptor.bDeviceClass == 0x00)
219 type = type_1;
220 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
221 type = type_1;
222 dbg("device type: %d", type);
223
224 for (i = 0; i < serial->num_ports; ++i) {
80b6ca48 225 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
1da177e4
LT		 226 if (!priv)
227 goto cleanup;
1da177e4
LT		 228 spin_lock_init(&priv->lock);
229 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
230 if (priv->buf == NULL) {
231 kfree(priv);
232 goto cleanup;
233 }
234 init_waitqueue_head(&priv->delta_msr_wait);
235 priv->type = type;
236 usb_set_serial_port_data(serial->port[i], priv);
237 }
238 return 0;
239
240cleanup:
241 for (--i; i>=0; --i) {
242 priv = usb_get_serial_port_data(serial->port[i]);
243 pl2303_buf_free(priv->buf);
244 kfree(priv);
245 usb_set_serial_port_data(serial->port[i], NULL);
246 }
247 return -ENOMEM;
248}
249
250static int set_control_lines (struct usb_device *dev, u8 value)
251{
252 int retval;
253
254 retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
255 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
256 value, 0, NULL, 0, 100);
257 dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
258 return retval;
259}
260
261static int pl2303_write (struct usb_serial_port *port, const unsigned char *buf, int count)
262{
263 struct pl2303_private *priv = usb_get_serial_port_data(port);
264 unsigned long flags;
265
266 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
267
268 if (!count)
269 return count;
270
271 spin_lock_irqsave(&priv->lock, flags);
272 count = pl2303_buf_put(priv->buf, buf, count);
273 spin_unlock_irqrestore(&priv->lock, flags);
274
275 pl2303_send(port);
276
277 return count;
278}
279
280static void pl2303_send(struct usb_serial_port *port)
281{
282 int count, result;
283 struct pl2303_private *priv = usb_get_serial_port_data(port);
284 unsigned long flags;
285
286 dbg("%s - port %d", __FUNCTION__, port->number);
287
288 spin_lock_irqsave(&priv->lock, flags);
289
290 if (priv->write_urb_in_use) {
291 spin_unlock_irqrestore(&priv->lock, flags);
292 return;
293 }
294
295 count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
296 port->bulk_out_size);
297
298 if (count == 0) {
299 spin_unlock_irqrestore(&priv->lock, flags);
300 return;
301 }
302
303 priv->write_urb_in_use = 1;
304
305 spin_unlock_irqrestore(&priv->lock, flags);
306
307 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
308
309 port->write_urb->transfer_buffer_length = count;
310 port->write_urb->dev = port->serial->dev;
311 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
312 if (result) {
313 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
314 priv->write_urb_in_use = 0;
315 // TODO: reschedule pl2303_send
316 }
317
cf2c7481 318 usb_serial_port_softint(port);
1da177e4
LT		 319}
320
321static int pl2303_write_room(struct usb_serial_port *port)
322{
323 struct pl2303_private *priv = usb_get_serial_port_data(port);
324 int room = 0;
325 unsigned long flags;
326
327 dbg("%s - port %d", __FUNCTION__, port->number);
328
329 spin_lock_irqsave(&priv->lock, flags);
330 room = pl2303_buf_space_avail(priv->buf);
331 spin_unlock_irqrestore(&priv->lock, flags);
332
333 dbg("%s - returns %d", __FUNCTION__, room);
334 return room;
335}
336
337static int pl2303_chars_in_buffer(struct usb_serial_port *port)
338{
339 struct pl2303_private *priv = usb_get_serial_port_data(port);
340 int chars = 0;
341 unsigned long flags;
342
343 dbg("%s - port %d", __FUNCTION__, port->number);
344
345 spin_lock_irqsave(&priv->lock, flags);
346 chars = pl2303_buf_data_avail(priv->buf);
347 spin_unlock_irqrestore(&priv->lock, flags);
348
349 dbg("%s - returns %d", __FUNCTION__, chars);
350 return chars;
351}
352
353static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
354{
355 struct usb_serial *serial = port->serial;
356 struct pl2303_private *priv = usb_get_serial_port_data(port);
357 unsigned long flags;
358 unsigned int cflag;
359 unsigned char *buf;
360 int baud;
361 int i;
362 u8 control;
363
364 dbg("%s - port %d", __FUNCTION__, port->number);
365
366 if ((!port->tty) || (!port->tty->termios)) {
367 dbg("%s - no tty structures", __FUNCTION__);
368 return;
369 }
370
371 spin_lock_irqsave(&priv->lock, flags);
372 if (!priv->termios_initialized) {
373 *(port->tty->termios) = tty_std_termios;
374 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
375 priv->termios_initialized = 1;
376 }
377 spin_unlock_irqrestore(&priv->lock, flags);
378
379 cflag = port->tty->termios->c_cflag;
380 /* check that they really want us to change something */
381 if (old_termios) {
382 if ((cflag == old_termios->c_cflag) &&
383 (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
384 dbg("%s - nothing to change...", __FUNCTION__);
385 return;
386 }
387 }
388
80b6ca48 389 buf = kzalloc (7, GFP_KERNEL);
1da177e4
LT		 390 if (!buf) {
391 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
392 return;
393 }
1da177e4
LT		 394
395 i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
396 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
397 0, 0, buf, 7, 100);
398 dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
399 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
400
401
402 if (cflag & CSIZE) {
403 switch (cflag & CSIZE) {
404 case CS5: buf[6] = 5; break;
405 case CS6: buf[6] = 6; break;
406 case CS7: buf[6] = 7; break;
407 default:
408 case CS8: buf[6] = 8; break;
409 }
410 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
411 }
412
413 baud = 0;
414 switch (cflag & CBAUD) {
415 case B0: baud = 0; break;
416 case B75: baud = 75; break;
417 case B150: baud = 150; break;
418 case B300: baud = 300; break;
419 case B600: baud = 600; break;
420 case B1200: baud = 1200; break;
421 case B1800: baud = 1800; break;
422 case B2400: baud = 2400; break;
423 case B4800: baud = 4800; break;
424 case B9600: baud = 9600; break;
425 case B19200: baud = 19200; break;
426 case B38400: baud = 38400; break;
427 case B57600: baud = 57600; break;
428 case B115200: baud = 115200; break;
429 case B230400: baud = 230400; break;
430 case B460800: baud = 460800; break;
431 default:
432 dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
433 break;
434 }
435 dbg("%s - baud = %d", __FUNCTION__, baud);
436 if (baud) {
437 buf[0] = baud & 0xff;
438 buf[1] = (baud >> 8) & 0xff;
439 buf[2] = (baud >> 16) & 0xff;
440 buf[3] = (baud >> 24) & 0xff;
441 }
442
443 /* For reference buf[4]=0 is 1 stop bits */
444 /* For reference buf[4]=1 is 1.5 stop bits */
445 /* For reference buf[4]=2 is 2 stop bits */
446 if (cflag & CSTOPB) {
447 buf[4] = 2;
448 dbg("%s - stop bits = 2", __FUNCTION__);
449 } else {
450 buf[4] = 0;
451 dbg("%s - stop bits = 1", __FUNCTION__);
452 }
453
454 if (cflag & PARENB) {
455 /* For reference buf[5]=0 is none parity */
456 /* For reference buf[5]=1 is odd parity */
457 /* For reference buf[5]=2 is even parity */
458 /* For reference buf[5]=3 is mark parity */
459 /* For reference buf[5]=4 is space parity */
460 if (cflag & PARODD) {
461 buf[5] = 1;
462 dbg("%s - parity = odd", __FUNCTION__);
463 } else {
464 buf[5] = 2;
465 dbg("%s - parity = even", __FUNCTION__);
466 }
467 } else {
468 buf[5] = 0;
469 dbg("%s - parity = none", __FUNCTION__);
470 }
471
472 i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
473 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
474 0, 0, buf, 7, 100);
475 dbg ("0x21:0x20:0:0 %d", i);
476
477 /* change control lines if we are switching to or from B0 */
478 spin_lock_irqsave(&priv->lock, flags);
479 control = priv->line_control;
480 if ((cflag & CBAUD) == B0)
481 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
482 else
483 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
484 if (control != priv->line_control) {
485 control = priv->line_control;
486 spin_unlock_irqrestore(&priv->lock, flags);
487 set_control_lines(serial->dev, control);
488 } else {
489 spin_unlock_irqrestore(&priv->lock, flags);
490 }
491
492 buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
493
494 i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
495 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
496 0, 0, buf, 7, 100);
497 dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
498 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
499
500 if (cflag & CRTSCTS) {
501 __u16 index;
502 if (priv->type == HX)
503 index = 0x61;
504 else
505 index = 0x41;
506 i = usb_control_msg(serial->dev,
507 usb_sndctrlpipe(serial->dev, 0),
508 VENDOR_WRITE_REQUEST,
509 VENDOR_WRITE_REQUEST_TYPE,
510 0x0, index, NULL, 0, 100);
511 dbg ("0x40:0x1:0x0:0x%x %d", index, i);
512 }
513
514 kfree (buf);
515}
516
517static int pl2303_open (struct usb_serial_port *port, struct file *filp)
518{
519 struct termios tmp_termios;
520 struct usb_serial *serial = port->serial;
521 struct pl2303_private *priv = usb_get_serial_port_data(port);
522 unsigned char *buf;
523 int result;
524
525 dbg("%s - port %d", __FUNCTION__, port->number);
526
1694899f
D		 527 if (priv->type != HX) {
528 usb_clear_halt(serial->dev, port->write_urb->pipe);
529 usb_clear_halt(serial->dev, port->read_urb->pipe);
530 }
1da177e4
LT		 531
532 buf = kmalloc(10, GFP_KERNEL);
533 if (buf==NULL)
534 return -ENOMEM;
535
536#define FISH(a,b,c,d) \
537 result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
538 b, a, c, d, buf, 1, 100); \
539 dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
540
541#define SOUP(a,b,c,d) \
542 result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \
543 b, a, c, d, NULL, 0, 100); \
544 dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
545
546 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
547 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
548 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
549 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
550 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
551 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
552 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
553 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
554 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
555 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
556
557 if (priv->type == HX) {
558 /* HX chip */
559 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
560 /* reset upstream data pipes */
561 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
562 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
563 } else {
564 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
565 }
566
567 kfree(buf);
568
569 /* Setup termios */
570 if (port->tty) {
571 pl2303_set_termios (port, &tmp_termios);
572 }
573
574 //FIXME: need to assert RTS and DTR if CRTSCTS off
575
576 dbg("%s - submitting read urb", __FUNCTION__);
577 port->read_urb->dev = serial->dev;
578 result = usb_submit_urb (port->read_urb, GFP_KERNEL);
579 if (result) {
580 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
581 pl2303_close (port, NULL);
582 return -EPROTO;
583 }
584
585 dbg("%s - submitting interrupt urb", __FUNCTION__);
586 port->interrupt_in_urb->dev = serial->dev;
587 result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
588 if (result) {
589 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
590 pl2303_close (port, NULL);
591 return -EPROTO;
592 }
593 return 0;
594}
595
596
597static void pl2303_close (struct usb_serial_port *port, struct file *filp)
598{
599 struct pl2303_private *priv = usb_get_serial_port_data(port);
600 unsigned long flags;
601 unsigned int c_cflag;
602 int bps;
603 long timeout;
80b47853 604 wait_queue_t wait;
1da177e4
LT		 605
606 dbg("%s - port %d", __FUNCTION__, port->number);
607
608 /* wait for data to drain from the buffer */
609 spin_lock_irqsave(&priv->lock, flags);
610 timeout = PL2303_CLOSING_WAIT;
611 init_waitqueue_entry(&wait, current);
612 add_wait_queue(&port->tty->write_wait, &wait);
613 for (;;) {
614 set_current_state(TASK_INTERRUPTIBLE);
615 if (pl2303_buf_data_avail(priv->buf) == 0
616 || timeout == 0 || signal_pending(current)
617 || !usb_get_intfdata(port->serial->interface)) /* disconnect */
618 break;
619 spin_unlock_irqrestore(&priv->lock, flags);
620 timeout = schedule_timeout(timeout);
621 spin_lock_irqsave(&priv->lock, flags);
622 }
623 set_current_state(TASK_RUNNING);
624 remove_wait_queue(&port->tty->write_wait, &wait);
625 /* clear out any remaining data in the buffer */
626 pl2303_buf_clear(priv->buf);
627 spin_unlock_irqrestore(&priv->lock, flags);
628
629 /* wait for characters to drain from the device */
630 /* (this is long enough for the entire 256 byte */
631 /* pl2303 hardware buffer to drain with no flow */
632 /* control for data rates of 1200 bps or more, */
633 /* for lower rates we should really know how much */
634 /* data is in the buffer to compute a delay */
635 /* that is not unnecessarily long) */
636 bps = tty_get_baud_rate(port->tty);
637 if (bps > 1200)
638 timeout = max((HZ*2560)/bps,HZ/10);
639 else
640 timeout = 2*HZ;
22c43863 641 schedule_timeout_interruptible(timeout);
1da177e4
LT		 642
643 /* shutdown our urbs */
644 dbg("%s - shutting down urbs", __FUNCTION__);
645 usb_kill_urb(port->write_urb);
646 usb_kill_urb(port->read_urb);
647 usb_kill_urb(port->interrupt_in_urb);
648
649 if (port->tty) {
650 c_cflag = port->tty->termios->c_cflag;
651 if (c_cflag & HUPCL) {
652 /* drop DTR and RTS */
653 spin_lock_irqsave(&priv->lock, flags);
654 priv->line_control = 0;
655 spin_unlock_irqrestore (&priv->lock, flags);
656 set_control_lines (port->serial->dev, 0);
657 }
658 }
659}
660
661static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
662 unsigned int set, unsigned int clear)
663{
664 struct pl2303_private *priv = usb_get_serial_port_data(port);
665 unsigned long flags;
666 u8 control;
667
6fdd8e8e
FL		 668 if (!usb_get_intfdata(port->serial->interface))
669 return -ENODEV;
670
1da177e4
LT		 671 spin_lock_irqsave (&priv->lock, flags);
672 if (set & TIOCM_RTS)
673 priv->line_control |= CONTROL_RTS;
674 if (set & TIOCM_DTR)
675 priv->line_control |= CONTROL_DTR;
676 if (clear & TIOCM_RTS)
677 priv->line_control &= ~CONTROL_RTS;
678 if (clear & TIOCM_DTR)
679 priv->line_control &= ~CONTROL_DTR;
680 control = priv->line_control;
681 spin_unlock_irqrestore (&priv->lock, flags);
682
683 return set_control_lines (port->serial->dev, control);
684}
685
686static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
687{
688 struct pl2303_private *priv = usb_get_serial_port_data(port);
689 unsigned long flags;
690 unsigned int mcr;
691 unsigned int status;
692 unsigned int result;
693
694 dbg("%s (%d)", __FUNCTION__, port->number);
695
6fdd8e8e
FL		 696 if (!usb_get_intfdata(port->serial->interface))
697 return -ENODEV;
698
1da177e4
LT		 699 spin_lock_irqsave (&priv->lock, flags);
700 mcr = priv->line_control;
701 status = priv->line_status;
702 spin_unlock_irqrestore (&priv->lock, flags);
703
704 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
705 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
706 | ((status & UART_CTS) ? TIOCM_CTS : 0)
707 | ((status & UART_DSR) ? TIOCM_DSR : 0)
708 | ((status & UART_RING) ? TIOCM_RI : 0)
709 | ((status & UART_DCD) ? TIOCM_CD : 0);
710
711 dbg("%s - result = %x", __FUNCTION__, result);
712
713 return result;
714}
715
716static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
717{
718 struct pl2303_private *priv = usb_get_serial_port_data(port);
719 unsigned long flags;
720 unsigned int prevstatus;
721 unsigned int status;
722 unsigned int changed;
723
724 spin_lock_irqsave (&priv->lock, flags);
725 prevstatus = priv->line_status;
726 spin_unlock_irqrestore (&priv->lock, flags);
727
728 while (1) {
729 interruptible_sleep_on(&priv->delta_msr_wait);
730 /* see if a signal did it */
731 if (signal_pending(current))
732 return -ERESTARTSYS;
733
734 spin_lock_irqsave (&priv->lock, flags);
735 status = priv->line_status;
736 spin_unlock_irqrestore (&priv->lock, flags);
737
738 changed=prevstatus^status;
739
740 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
741 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
742 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
743 ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
744 return 0;
745 }
746 prevstatus = status;
747 }
748 /* NOTREACHED */
749 return 0;
750}
751
752static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
753{
754 dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
755
756 switch (cmd) {
757 case TIOCMIWAIT:
758 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
759 return wait_modem_info(port, arg);
760
761 default:
762 dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
763 break;
764 }
765
766 return -ENOIOCTLCMD;
767}
768
769static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
770{
771 struct usb_serial *serial = port->serial;
772 u16 state;
773 int result;
774
775 dbg("%s - port %d", __FUNCTION__, port->number);
776
777 if (break_state == 0)
778 state = BREAK_OFF;
779 else
780 state = BREAK_ON;
781 dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
782
783 result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
784 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
785 0, NULL, 0, 100);
786 if (result)
787 dbg("%s - error sending break = %d", __FUNCTION__, result);
788}
789
790
791static void pl2303_shutdown (struct usb_serial *serial)
792{
793 int i;
794 struct pl2303_private *priv;
795
796 dbg("%s", __FUNCTION__);
797
798 for (i = 0; i < serial->num_ports; ++i) {
799 priv = usb_get_serial_port_data(serial->port[i]);
800 if (priv) {
801 pl2303_buf_free(priv->buf);
802 kfree(priv);
803 usb_set_serial_port_data(serial->port[i], NULL);
804 }
805 }
806}
807
97bb13ec
FL		 808static void pl2303_update_line_status(struct usb_serial_port *port,
809 unsigned char *data,
810 unsigned int actual_length)
811{
812
813 struct pl2303_private *priv = usb_get_serial_port_data(port);
814 unsigned long flags;
815 u8 status_idx = UART_STATE;
95f209f9 816 u8 length = UART_STATE + 1;
97bb13ec
FL		 817
818 if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
b8f4c1d6
LFC		 819 (le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65 ||
820 le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_SX1 ||
821 le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X75)) {
97bb13ec
FL		 822 length = 1;
823 status_idx = 0;
824 }
825
826 if (actual_length < length)
a009b75a 827 return;
97bb13ec
FL		 828
829 /* Save off the uart status for others to look at */
830 spin_lock_irqsave(&priv->lock, flags);
831 priv->line_status = data[status_idx];
832 spin_unlock_irqrestore(&priv->lock, flags);
96050b11 833 wake_up_interruptible (&priv->delta_msr_wait);
97bb13ec 834}
1da177e4
LT		 835
836static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
837{
838 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1da177e4 839 unsigned char *data = urb->transfer_buffer;
97bb13ec 840 unsigned int actual_length = urb->actual_length;
1da177e4 841 int status;
1da177e4
LT		 842
843 dbg("%s (%d)", __FUNCTION__, port->number);
844
845 switch (urb->status) {
846 case 0:
847 /* success */
848 break;
849 case -ECONNRESET:
850 case -ENOENT:
851 case -ESHUTDOWN:
852 /* this urb is terminated, clean up */
853 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
854 return;
855 default:
856 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
857 goto exit;
858 }
859
1da177e4 860 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
97bb13ec 861 pl2303_update_line_status(port, data, actual_length);
1da177e4 862
1da177e4
LT		 863exit:
864 status = usb_submit_urb (urb, GFP_ATOMIC);
865 if (status)
866 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
867 __FUNCTION__, status);
868}
869
870
871static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
872{
873 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
874 struct pl2303_private *priv = usb_get_serial_port_data(port);
875 struct tty_struct *tty;
876 unsigned char *data = urb->transfer_buffer;
877 unsigned long flags;
878 int i;
879 int result;
880 u8 status;
881 char tty_flag;
882
883 dbg("%s - port %d", __FUNCTION__, port->number);
884
885 if (urb->status) {
886 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
887 if (!port->open_count) {
888 dbg("%s - port is closed, exiting.", __FUNCTION__);
889 return;
890 }
891 if (urb->status == -EPROTO) {
892 /* PL2303 mysteriously fails with -EPROTO reschedule the read */
893 dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
894 urb->status = 0;
895 urb->dev = port->serial->dev;
896 result = usb_submit_urb(urb, GFP_ATOMIC);
897 if (result)
898 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
899 return;
900 }
901 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
902 return;
903 }
904
905 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
906
907 /* get tty_flag from status */
908 tty_flag = TTY_NORMAL;
909
910 spin_lock_irqsave(&priv->lock, flags);
911 status = priv->line_status;
912 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
913 spin_unlock_irqrestore(&priv->lock, flags);
914 wake_up_interruptible (&priv->delta_msr_wait);
915
916 /* break takes precedence over parity, */
917 /* which takes precedence over framing errors */
918 if (status & UART_BREAK_ERROR )
919 tty_flag = TTY_BREAK;
920 else if (status & UART_PARITY_ERROR)
921 tty_flag = TTY_PARITY;
922 else if (status & UART_FRAME_ERROR)
923 tty_flag = TTY_FRAME;
924 dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
925
926 tty = port->tty;
927 if (tty && urb->actual_length) {
33f0f88f 928 tty_buffer_request_room(tty, urb->actual_length + 1);
1da177e4
LT		 929 /* overrun is special, not associated with a char */
930 if (status & UART_OVERRUN_ERROR)
931 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
33f0f88f 932 for (i = 0; i < urb->actual_length; ++i)
1da177e4 933 tty_insert_flip_char (tty, data[i], tty_flag);
1da177e4
LT		 934 tty_flip_buffer_push (tty);
935 }
936
937 /* Schedule the next read _if_ we are still open */
938 if (port->open_count) {
939 urb->dev = port->serial->dev;
940 result = usb_submit_urb(urb, GFP_ATOMIC);
941 if (result)
942 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
943 }
944
945 return;
946}
947
948
949
950static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
951{
952 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
953 struct pl2303_private *priv = usb_get_serial_port_data(port);
954 int result;
955
956 dbg("%s - port %d", __FUNCTION__, port->number);
957
958 switch (urb->status) {
959 case 0:
960 /* success */
961 break;
962 case -ECONNRESET:
963 case -ENOENT:
964 case -ESHUTDOWN:
965 /* this urb is terminated, clean up */
966 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
967 priv->write_urb_in_use = 0;
968 return;
969 default:
970 /* error in the urb, so we have to resubmit it */
971 dbg("%s - Overflow in write", __FUNCTION__);
972 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
973 port->write_urb->transfer_buffer_length = 1;
974 port->write_urb->dev = port->serial->dev;
975 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
976 if (result)
977 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
978 else
979 return;
980 }
981
982 priv->write_urb_in_use = 0;
983
984 /* send any buffered data */
985 pl2303_send(port);
986}
987
988
989/*
990 * pl2303_buf_alloc
991 *
992 * Allocate a circular buffer and all associated memory.
993 */
994
995static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
996{
997
998 struct pl2303_buf *pb;
999
1000
1001 if (size == 0)
1002 return NULL;
1003
1004 pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1005 if (pb == NULL)
1006 return NULL;
1007
1008 pb->buf_buf = kmalloc(size, GFP_KERNEL);
1009 if (pb->buf_buf == NULL) {
1010 kfree(pb);
1011 return NULL;
1012 }
1013
1014 pb->buf_size = size;
1015 pb->buf_get = pb->buf_put = pb->buf_buf;
1016
1017 return pb;
1018
1019}
1020
1021
1022/*
1023 * pl2303_buf_free
1024 *
1025 * Free the buffer and all associated memory.
1026 */
1027
1028static void pl2303_buf_free(struct pl2303_buf *pb)
1029{
1bc3c9e1
JJ		 1030 if (pb) {
1031 kfree(pb->buf_buf);
1da177e4
LT		 1032 kfree(pb);
1033 }
1034}
1035
1036
1037/*
1038 * pl2303_buf_clear
1039 *
1040 * Clear out all data in the circular buffer.
1041 */
1042
1043static void pl2303_buf_clear(struct pl2303_buf *pb)
1044{
1045 if (pb != NULL)
1046 pb->buf_get = pb->buf_put;
1047 /* equivalent to a get of all data available */
1048}
1049
1050
1051/*
1052 * pl2303_buf_data_avail
1053 *
1054 * Return the number of bytes of data available in the circular
1055 * buffer.
1056 */
1057
1058static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1059{
1060 if (pb != NULL)
1061 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1062 else
1063 return 0;
1064}
1065
1066
1067/*
1068 * pl2303_buf_space_avail
1069 *
1070 * Return the number of bytes of space available in the circular
1071 * buffer.
1072 */
1073
1074static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1075{
1076 if (pb != NULL)
1077 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1078 else
1079 return 0;
1080}
1081
1082
1083/*
1084 * pl2303_buf_put
1085 *
1086 * Copy data data from a user buffer and put it into the circular buffer.
1087 * Restrict to the amount of space available.
1088 *
1089 * Return the number of bytes copied.
1090 */
1091
1092static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1093 unsigned int count)
1094{
1095
1096 unsigned int len;
1097
1098
1099 if (pb == NULL)
1100 return 0;
1101
1102 len = pl2303_buf_space_avail(pb);
1103 if (count > len)
1104 count = len;
1105
1106 if (count == 0)
1107 return 0;
1108
1109 len = pb->buf_buf + pb->buf_size - pb->buf_put;
1110 if (count > len) {
1111 memcpy(pb->buf_put, buf, len);
1112 memcpy(pb->buf_buf, buf+len, count - len);
1113 pb->buf_put = pb->buf_buf + count - len;
1114 } else {
1115 memcpy(pb->buf_put, buf, count);
1116 if (count < len)
1117 pb->buf_put += count;
1118 else /* count == len */
1119 pb->buf_put = pb->buf_buf;
1120 }
1121
1122 return count;
1123
1124}
1125
1126
1127/*
1128 * pl2303_buf_get
1129 *
1130 * Get data from the circular buffer and copy to the given buffer.
1131 * Restrict to the amount of data available.
1132 *
1133 * Return the number of bytes copied.
1134 */
1135
1136static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1137 unsigned int count)
1138{
1139
1140 unsigned int len;
1141
1142
1143 if (pb == NULL)
1144 return 0;
1145
1146 len = pl2303_buf_data_avail(pb);
1147 if (count > len)
1148 count = len;
1149
1150 if (count == 0)
1151 return 0;
1152
1153 len = pb->buf_buf + pb->buf_size - pb->buf_get;
1154 if (count > len) {
1155 memcpy(buf, pb->buf_get, len);
1156 memcpy(buf+len, pb->buf_buf, count - len);
1157 pb->buf_get = pb->buf_buf + count - len;
1158 } else {
1159 memcpy(buf, pb->buf_get, count);
1160 if (count < len)
1161 pb->buf_get += count;
1162 else /* count == len */
1163 pb->buf_get = pb->buf_buf;
1164 }
1165
1166 return count;
1167
1168}
1169
1170static int __init pl2303_init (void)
1171{
1172 int retval;
1173 retval = usb_serial_register(&pl2303_device);
1174 if (retval)
1175 goto failed_usb_serial_register;
1176 retval = usb_register(&pl2303_driver);
1177 if (retval)
1178 goto failed_usb_register;
17a882fc 1179 info(DRIVER_DESC);
1da177e4
LT		 1180 return 0;
1181failed_usb_register:
1182 usb_serial_deregister(&pl2303_device);
1183failed_usb_serial_register:
1184 return retval;
1185}
1186
1187
1188static void __exit pl2303_exit (void)
1189{
1190 usb_deregister (&pl2303_driver);
1191 usb_serial_deregister (&pl2303_device);
1192}
1193
1194
1195module_init(pl2303_init);
1196module_exit(pl2303_exit);
1197
1198MODULE_DESCRIPTION(DRIVER_DESC);
1da177e4
LT		 1199MODULE_LICENSE("GPL");
1200
1201module_param(debug, bool, S_IRUGO | S_IWUSR);
1202MODULE_PARM_DESC(debug, "Debug enabled or not");
1203
Linux 6.x block layer and io_uring tree(s)