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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / usb / serial / f81232.c
blob43fa1f0716b7d759d113ffe9b951f85369b98c50
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Fintek F81232 USB to serial adaptor driver
4 *
5 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
6 * Copyright (C) 2012 Linux Foundation
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/slab.h>
12 #include <linux/tty.h>
13 #include <linux/tty_driver.h>
14 #include <linux/tty_flip.h>
15 #include <linux/serial.h>
16 #include <linux/module.h>
17 #include <linux/moduleparam.h>
18 #include <linux/mutex.h>
19 #include <linux/uaccess.h>
20 #include <linux/usb.h>
21 #include <linux/usb/serial.h>
22 #include <linux/serial_reg.h>
23
24 static const struct usb_device_id id_table[] = {
25 { USB_DEVICE(0x1934, 0x0706) },
26 { } /* Terminating entry */
27 };
28 MODULE_DEVICE_TABLE(usb, id_table);
29
30 /* Maximum baudrate for F81232 */
31 #define F81232_MAX_BAUDRATE 1500000
32 #define F81232_DEF_BAUDRATE 9600
33
34 /* USB Control EP parameter */
35 #define F81232_REGISTER_REQUEST 0xa0
36 #define F81232_GET_REGISTER 0xc0
37 #define F81232_SET_REGISTER 0x40
38
39 #define SERIAL_BASE_ADDRESS 0x0120
40 #define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
41 #define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
42 #define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
43 #define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
44 #define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
45 #define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
46 #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
47
48 /*
49 * F81232 Clock registers (106h)
50 *
51 * Bit1-0: Clock source selector
52 * 00: 1.846MHz.
53 * 01: 18.46MHz.
54 * 10: 24MHz.
55 * 11: 14.77MHz.
56 */
57 #define F81232_CLK_REGISTER 0x106
58 #define F81232_CLK_1_846_MHZ 0
59 #define F81232_CLK_18_46_MHZ BIT(0)
60 #define F81232_CLK_24_MHZ BIT(1)
61 #define F81232_CLK_14_77_MHZ (BIT(1) | BIT(0))
62 #define F81232_CLK_MASK GENMASK(1, 0)
63
64 struct f81232_private {
65 struct mutex lock;
66 u8 modem_control;
67 u8 modem_status;
68 u8 shadow_lcr;
69 speed_t baud_base;
70 struct work_struct lsr_work;
71 struct work_struct interrupt_work;
72 struct usb_serial_port *port;
73 };
74
75 static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
76 static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
77 F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };
78
79 static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
80 {
81 if (!baudrate)
82 return 0;
83
84 return DIV_ROUND_CLOSEST(clockrate, baudrate);
85 }
86
87 static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
88 {
89 int status;
90 u8 *tmp;
91 struct usb_device *dev = port->serial->dev;
92
93 tmp = kmalloc(sizeof(*val), GFP_KERNEL);
94 if (!tmp)
95 return -ENOMEM;
96
97 status = usb_control_msg(dev,
98 usb_rcvctrlpipe(dev, 0),
99 F81232_REGISTER_REQUEST,
100 F81232_GET_REGISTER,
101 reg,
102 0,
103 tmp,
104 sizeof(*val),
105 USB_CTRL_GET_TIMEOUT);
106 if (status != sizeof(*val)) {
107 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
108
109 if (status < 0)
110 status = usb_translate_errors(status);
111 else
112 status = -EIO;
113 } else {
114 status = 0;
115 *val = *tmp;
116 }
117
118 kfree(tmp);
119 return status;
120 }
121
122 static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
123 {
124 int status;
125 u8 *tmp;
126 struct usb_device *dev = port->serial->dev;
127
128 tmp = kmalloc(sizeof(val), GFP_KERNEL);
129 if (!tmp)
130 return -ENOMEM;
131
132 *tmp = val;
133
134 status = usb_control_msg(dev,
135 usb_sndctrlpipe(dev, 0),
136 F81232_REGISTER_REQUEST,
137 F81232_SET_REGISTER,
138 reg,
139 0,
140 tmp,
141 sizeof(val),
142 USB_CTRL_SET_TIMEOUT);
143 if (status != sizeof(val)) {
144 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
145
146 if (status < 0)
147 status = usb_translate_errors(status);
148 else
149 status = -EIO;
150 } else {
151 status = 0;
152 }
153
154 kfree(tmp);
155 return status;
156 }
157
158 static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
159 u8 mask, u8 val)
160 {
161 int status;
162 u8 tmp;
163
164 status = f81232_get_register(port, reg, &tmp);
165 if (status)
166 return status;
167
168 tmp = (tmp & ~mask) | (val & mask);
169
170 return f81232_set_register(port, reg, tmp);
171 }
172
173 static void f81232_read_msr(struct usb_serial_port *port)
174 {
175 int status;
176 u8 current_msr;
177 struct tty_struct *tty;
178 struct f81232_private *priv = usb_get_serial_port_data(port);
179
180 mutex_lock(&priv->lock);
181 status = f81232_get_register(port, MODEM_STATUS_REGISTER,
182 &current_msr);
183 if (status) {
184 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
185 mutex_unlock(&priv->lock);
186 return;
187 }
188
189 if (!(current_msr & UART_MSR_ANY_DELTA)) {
190 mutex_unlock(&priv->lock);
191 return;
192 }
193
194 priv->modem_status = current_msr;
195
196 if (current_msr & UART_MSR_DCTS)
197 port->icount.cts++;
198 if (current_msr & UART_MSR_DDSR)
199 port->icount.dsr++;
200 if (current_msr & UART_MSR_TERI)
201 port->icount.rng++;
202 if (current_msr & UART_MSR_DDCD) {
203 port->icount.dcd++;
204 tty = tty_port_tty_get(&port->port);
205 if (tty) {
206 usb_serial_handle_dcd_change(port, tty,
207 current_msr & UART_MSR_DCD);
208
209 tty_kref_put(tty);
210 }
211 }
212
213 wake_up_interruptible(&port->port.delta_msr_wait);
214 mutex_unlock(&priv->lock);
215 }
216
217 static int f81232_set_mctrl(struct usb_serial_port *port,
218 unsigned int set, unsigned int clear)
219 {
220 u8 val;
221 int status;
222 struct f81232_private *priv = usb_get_serial_port_data(port);
223
224 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
225 return 0; /* no change */
226
227 /* 'set' takes precedence over 'clear' */
228 clear &= ~set;
229
230 /* force enable interrupt with OUT2 */
231 mutex_lock(&priv->lock);
232 val = UART_MCR_OUT2 | priv->modem_control;
233
234 if (clear & TIOCM_DTR)
235 val &= ~UART_MCR_DTR;
236
237 if (clear & TIOCM_RTS)
238 val &= ~UART_MCR_RTS;
239
240 if (set & TIOCM_DTR)
241 val |= UART_MCR_DTR;
242
243 if (set & TIOCM_RTS)
244 val |= UART_MCR_RTS;
245
246 dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
247 val, priv->modem_control);
248
249 status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
250 if (status) {
251 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
252 mutex_unlock(&priv->lock);
253 return status;
254 }
255
256 priv->modem_control = val;
257 mutex_unlock(&priv->lock);
258
259 return 0;
260 }
261
262 static void f81232_update_line_status(struct usb_serial_port *port,
263 unsigned char *data,
264 size_t actual_length)
265 {
266 struct f81232_private *priv = usb_get_serial_port_data(port);
267
268 if (!actual_length)
269 return;
270
271 switch (data[0] & 0x07) {
272 case 0x00: /* msr change */
273 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
274 schedule_work(&priv->interrupt_work);
275 break;
276 case 0x02: /* tx-empty */
277 break;
278 case 0x04: /* rx data available */
279 break;
280 case 0x06: /* lsr change */
281 /* we can forget it. the LSR will read from bulk-in */
282 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
283 break;
284 }
285 }
286
287 static void f81232_read_int_callback(struct urb *urb)
288 {
289 struct usb_serial_port *port = urb->context;
290 unsigned char *data = urb->transfer_buffer;
291 unsigned int actual_length = urb->actual_length;
292 int status = urb->status;
293 int retval;
294
295 switch (status) {
296 case 0:
297 /* success */
298 break;
299 case -ECONNRESET:
300 case -ENOENT:
301 case -ESHUTDOWN:
302 /* this urb is terminated, clean up */
303 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
304 __func__, status);
305 return;
306 default:
307 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
308 __func__, status);
309 goto exit;
310 }
311
312 usb_serial_debug_data(&port->dev, __func__,
313 urb->actual_length, urb->transfer_buffer);
314
315 f81232_update_line_status(port, data, actual_length);
316
317 exit:
318 retval = usb_submit_urb(urb, GFP_ATOMIC);
319 if (retval)
320 dev_err(&urb->dev->dev,
321 "%s - usb_submit_urb failed with result %d\n",
322 __func__, retval);
323 }
324
325 static void f81232_process_read_urb(struct urb *urb)
326 {
327 struct usb_serial_port *port = urb->context;
328 struct f81232_private *priv = usb_get_serial_port_data(port);
329 unsigned char *data = urb->transfer_buffer;
330 char tty_flag;
331 unsigned int i;
332 u8 lsr;
333
334 /*
335 * When opening the port we get a 1-byte packet with the current LSR,
336 * which we discard.
337 */
338 if ((urb->actual_length < 2) || (urb->actual_length % 2))
339 return;
340
341 /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
342
343 for (i = 0; i < urb->actual_length; i += 2) {
344 tty_flag = TTY_NORMAL;
345 lsr = data[i];
346
347 if (lsr & UART_LSR_BRK_ERROR_BITS) {
348 if (lsr & UART_LSR_BI) {
349 tty_flag = TTY_BREAK;
350 port->icount.brk++;
351 usb_serial_handle_break(port);
352 } else if (lsr & UART_LSR_PE) {
353 tty_flag = TTY_PARITY;
354 port->icount.parity++;
355 } else if (lsr & UART_LSR_FE) {
356 tty_flag = TTY_FRAME;
357 port->icount.frame++;
358 }
359
360 if (lsr & UART_LSR_OE) {
361 port->icount.overrun++;
362 schedule_work(&priv->lsr_work);
363 tty_insert_flip_char(&port->port, 0,
364 TTY_OVERRUN);
365 }
366 }
367
368 if (port->port.console && port->sysrq) {
369 if (usb_serial_handle_sysrq_char(port, data[i + 1]))
370 continue;
371 }
372
373 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
374 }
375
376 tty_flip_buffer_push(&port->port);
377 }
378
379 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
380 {
381 struct usb_serial_port *port = tty->driver_data;
382 struct f81232_private *priv = usb_get_serial_port_data(port);
383 int status;
384
385 mutex_lock(&priv->lock);
386
387 if (break_state)
388 priv->shadow_lcr |= UART_LCR_SBC;
389 else
390 priv->shadow_lcr &= ~UART_LCR_SBC;
391
392 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
393 priv->shadow_lcr);
394 if (status)
395 dev_err(&port->dev, "set break failed: %d\n", status);
396
397 mutex_unlock(&priv->lock);
398 }
399
400 static int f81232_find_clk(speed_t baudrate)
401 {
402 int idx;
403
404 for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
405 if (baudrate <= baudrate_table[idx] &&
406 baudrate_table[idx] % baudrate == 0)
407 return idx;
408 }
409
410 return -EINVAL;
411 }
412
413 static void f81232_set_baudrate(struct tty_struct *tty,
414 struct usb_serial_port *port, speed_t baudrate,
415 speed_t old_baudrate)
416 {
417 struct f81232_private *priv = usb_get_serial_port_data(port);
418 u8 lcr;
419 int divisor;
420 int status = 0;
421 int i;
422 int idx;
423 speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE };
424
425 for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
426 idx = f81232_find_clk(baud_list[i]);
427 if (idx >= 0) {
428 baudrate = baud_list[i];
429 tty_encode_baud_rate(tty, baudrate, baudrate);
430 break;
431 }
432 }
433
434 if (idx < 0)
435 return;
436
437 priv->baud_base = baudrate_table[idx];
438 divisor = calc_baud_divisor(baudrate, priv->baud_base);
439
440 status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
441 F81232_CLK_MASK, clock_table[idx]);
442 if (status) {
443 dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
444 __func__, status);
445 return;
446 }
447
448 status = f81232_get_register(port, LINE_CONTROL_REGISTER,
449 &lcr); /* get LCR */
450 if (status) {
451 dev_err(&port->dev, "%s failed to get LCR: %d\n",
452 __func__, status);
453 return;
454 }
455
456 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
457 lcr | UART_LCR_DLAB); /* Enable DLAB */
458 if (status) {
459 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
460 __func__, status);
461 return;
462 }
463
464 status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
465 divisor & 0x00ff); /* low */
466 if (status) {
467 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
468 __func__, status);
469 goto reapply_lcr;
470 }
471
472 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
473 (divisor & 0xff00) >> 8); /* high */
474 if (status) {
475 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
476 __func__, status);
477 }
478
479 reapply_lcr:
480 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
481 lcr & ~UART_LCR_DLAB);
482 if (status) {
483 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
484 __func__, status);
485 }
486 }
487
488 static int f81232_port_enable(struct usb_serial_port *port)
489 {
490 u8 val;
491 int status;
492
493 /* fifo on, trigger8, clear TX/RX*/
494 val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
495 UART_FCR_CLEAR_XMIT;
496
497 status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
498 if (status) {
499 dev_err(&port->dev, "%s failed to set FCR: %d\n",
500 __func__, status);
501 return status;
502 }
503
504 /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
505 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
506 UART_IER_MSI);
507 if (status) {
508 dev_err(&port->dev, "%s failed to set IER: %d\n",
509 __func__, status);
510 return status;
511 }
512
513 return 0;
514 }
515
516 static int f81232_port_disable(struct usb_serial_port *port)
517 {
518 int status;
519
520 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
521 if (status) {
522 dev_err(&port->dev, "%s failed to set IER: %d\n",
523 __func__, status);
524 return status;
525 }
526
527 return 0;
528 }
529
530 static void f81232_set_termios(struct tty_struct *tty,
531 struct usb_serial_port *port, struct ktermios *old_termios)
532 {
533 struct f81232_private *priv = usb_get_serial_port_data(port);
534 u8 new_lcr = 0;
535 int status = 0;
536 speed_t baudrate;
537 speed_t old_baud;
538
539 /* Don't change anything if nothing has changed */
540 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
541 return;
542
543 if (C_BAUD(tty) == B0)
544 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
545 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
546 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
547
548 baudrate = tty_get_baud_rate(tty);
549 if (baudrate > 0) {
550 if (old_termios)
551 old_baud = tty_termios_baud_rate(old_termios);
552 else
553 old_baud = F81232_DEF_BAUDRATE;
554
555 f81232_set_baudrate(tty, port, baudrate, old_baud);
556 }
557
558 if (C_PARENB(tty)) {
559 new_lcr |= UART_LCR_PARITY;
560
561 if (!C_PARODD(tty))
562 new_lcr |= UART_LCR_EPAR;
563
564 if (C_CMSPAR(tty))
565 new_lcr |= UART_LCR_SPAR;
566 }
567
568 if (C_CSTOPB(tty))
569 new_lcr |= UART_LCR_STOP;
570
571 switch (C_CSIZE(tty)) {
572 case CS5:
573 new_lcr |= UART_LCR_WLEN5;
574 break;
575 case CS6:
576 new_lcr |= UART_LCR_WLEN6;
577 break;
578 case CS7:
579 new_lcr |= UART_LCR_WLEN7;
580 break;
581 default:
582 case CS8:
583 new_lcr |= UART_LCR_WLEN8;
584 break;
585 }
586
587 mutex_lock(&priv->lock);
588
589 new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
590 status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
591 if (status) {
592 dev_err(&port->dev, "%s failed to set LCR: %d\n",
593 __func__, status);
594 }
595
596 priv->shadow_lcr = new_lcr;
597
598 mutex_unlock(&priv->lock);
599 }
600
601 static int f81232_tiocmget(struct tty_struct *tty)
602 {
603 int r;
604 struct usb_serial_port *port = tty->driver_data;
605 struct f81232_private *port_priv = usb_get_serial_port_data(port);
606 u8 mcr, msr;
607
608 /* force get current MSR changed state */
609 f81232_read_msr(port);
610
611 mutex_lock(&port_priv->lock);
612 mcr = port_priv->modem_control;
613 msr = port_priv->modem_status;
614 mutex_unlock(&port_priv->lock);
615
616 r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
617 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
618 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
619 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
620 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
621 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
622
623 return r;
624 }
625
626 static int f81232_tiocmset(struct tty_struct *tty,
627 unsigned int set, unsigned int clear)
628 {
629 struct usb_serial_port *port = tty->driver_data;
630
631 return f81232_set_mctrl(port, set, clear);
632 }
633
634 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
635 {
636 int result;
637
638 result = f81232_port_enable(port);
639 if (result)
640 return result;
641
642 /* Setup termios */
643 if (tty)
644 f81232_set_termios(tty, port, NULL);
645
646 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
647 if (result) {
648 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
649 " error %d\n", __func__, result);
650 return result;
651 }
652
653 result = usb_serial_generic_open(tty, port);
654 if (result) {
655 usb_kill_urb(port->interrupt_in_urb);
656 return result;
657 }
658
659 return 0;
660 }
661
662 static void f81232_close(struct usb_serial_port *port)
663 {
664 struct f81232_private *port_priv = usb_get_serial_port_data(port);
665
666 f81232_port_disable(port);
667 usb_serial_generic_close(port);
668 usb_kill_urb(port->interrupt_in_urb);
669 flush_work(&port_priv->interrupt_work);
670 flush_work(&port_priv->lsr_work);
671 }
672
673 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
674 {
675 if (on)
676 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
677 else
678 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
679 }
680
681 static int f81232_carrier_raised(struct usb_serial_port *port)
682 {
683 u8 msr;
684 struct f81232_private *priv = usb_get_serial_port_data(port);
685
686 mutex_lock(&priv->lock);
687 msr = priv->modem_status;
688 mutex_unlock(&priv->lock);
689
690 if (msr & UART_MSR_DCD)
691 return 1;
692 return 0;
693 }
694
695 static int f81232_get_serial_info(struct tty_struct *tty,
696 struct serial_struct *ss)
697 {
698 struct usb_serial_port *port = tty->driver_data;
699 struct f81232_private *priv = usb_get_serial_port_data(port);
700
701 ss->type = PORT_16550A;
702 ss->line = port->minor;
703 ss->port = port->port_number;
704 ss->baud_base = priv->baud_base;
705 return 0;
706 }
707
708 static void f81232_interrupt_work(struct work_struct *work)
709 {
710 struct f81232_private *priv =
711 container_of(work, struct f81232_private, interrupt_work);
712
713 f81232_read_msr(priv->port);
714 }
715
716 static void f81232_lsr_worker(struct work_struct *work)
717 {
718 struct f81232_private *priv;
719 struct usb_serial_port *port;
720 int status;
721 u8 tmp;
722
723 priv = container_of(work, struct f81232_private, lsr_work);
724 port = priv->port;
725
726 status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
727 if (status)
728 dev_warn(&port->dev, "read LSR failed: %d\n", status);
729 }
730
731 static int f81232_port_probe(struct usb_serial_port *port)
732 {
733 struct f81232_private *priv;
734
735 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
736 if (!priv)
737 return -ENOMEM;
738
739 mutex_init(&priv->lock);
740 INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
741 INIT_WORK(&priv->lsr_work, f81232_lsr_worker);
742
743 usb_set_serial_port_data(port, priv);
744
745 port->port.drain_delay = 256;
746 priv->port = port;
747
748 return 0;
749 }
750
751 static int f81232_port_remove(struct usb_serial_port *port)
752 {
753 struct f81232_private *priv;
754
755 priv = usb_get_serial_port_data(port);
756 kfree(priv);
757
758 return 0;
759 }
760
761 static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
762 {
763 struct usb_serial_port *port = serial->port[0];
764 struct f81232_private *port_priv = usb_get_serial_port_data(port);
765 int i;
766
767 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
768 usb_kill_urb(port->read_urbs[i]);
769
770 usb_kill_urb(port->interrupt_in_urb);
771
772 if (port_priv) {
773 flush_work(&port_priv->interrupt_work);
774 flush_work(&port_priv->lsr_work);
775 }
776
777 return 0;
778 }
779
780 static int f81232_resume(struct usb_serial *serial)
781 {
782 struct usb_serial_port *port = serial->port[0];
783 int result;
784
785 if (tty_port_initialized(&port->port)) {
786 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
787 if (result) {
788 dev_err(&port->dev, "submit interrupt urb failed: %d\n",
789 result);
790 return result;
791 }
792 }
793
794 return usb_serial_generic_resume(serial);
795 }
796
797 static struct usb_serial_driver f81232_device = {
798 .driver = {
799 .owner = THIS_MODULE,
800 .name = "f81232",
801 },
802 .id_table = id_table,
803 .num_ports = 1,
804 .bulk_in_size = 256,
805 .bulk_out_size = 256,
806 .open = f81232_open,
807 .close = f81232_close,
808 .dtr_rts = f81232_dtr_rts,
809 .carrier_raised = f81232_carrier_raised,
810 .get_serial = f81232_get_serial_info,
811 .break_ctl = f81232_break_ctl,
812 .set_termios = f81232_set_termios,
813 .tiocmget = f81232_tiocmget,
814 .tiocmset = f81232_tiocmset,
815 .tiocmiwait = usb_serial_generic_tiocmiwait,
816 .process_read_urb = f81232_process_read_urb,
817 .read_int_callback = f81232_read_int_callback,
818 .port_probe = f81232_port_probe,
819 .port_remove = f81232_port_remove,
820 .suspend = f81232_suspend,
821 .resume = f81232_resume,
822 };
823
824 static struct usb_serial_driver * const serial_drivers[] = {
825 &f81232_device,
826 NULL,
827 };
828
829 module_usb_serial_driver(serial_drivers, id_table);
830
831 MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
832 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
833 MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
834 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support