1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Fintek F81232 USB to serial adaptor driver
4 * Fintek F81532A/534A/535/536 USB to 2/4/8/12 serial adaptor driver
5 *
6 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
7 * Copyright (C) 2012 Linux Foundation
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/tty.h>
14 #include <linux/tty_driver.h>
15 #include <linux/tty_flip.h>
16 #include <linux/serial.h>
17 #include <linux/module.h>
18 #include <linux/moduleparam.h>
19 #include <linux/mutex.h>
20 #include <linux/uaccess.h>
21 #include <linux/usb.h>
22 #include <linux/usb/serial.h>
23 #include <linux/serial_reg.h>
24
25 #define F81232_ID \
26 { USB_DEVICE(0x1934, 0x0706) } /* 1 port UART device */
27
28 #define F81534A_SERIES_ID \
29 { USB_DEVICE(0x2c42, 0x1602) }, /* In-Box 2 port UART device */ \
30 { USB_DEVICE(0x2c42, 0x1604) }, /* In-Box 4 port UART device */ \
31 { USB_DEVICE(0x2c42, 0x1605) }, /* In-Box 8 port UART device */ \
32 { USB_DEVICE(0x2c42, 0x1606) }, /* In-Box 12 port UART device */ \
33 { USB_DEVICE(0x2c42, 0x1608) }, /* Non-Flash type */ \
34 { USB_DEVICE(0x2c42, 0x1632) }, /* 2 port UART device */ \
35 { USB_DEVICE(0x2c42, 0x1634) }, /* 4 port UART device */ \
36 { USB_DEVICE(0x2c42, 0x1635) }, /* 8 port UART device */ \
37 { USB_DEVICE(0x2c42, 0x1636) } /* 12 port UART device */
38
39 #define F81534A_CTRL_ID \
40 { USB_DEVICE(0x2c42, 0x16f8) } /* Global control device */
41
42 static const struct usb_device_id f81232_id_table[] = {
43 F81232_ID,
44 { } /* Terminating entry */
45 };
46
47 static const struct usb_device_id f81534a_id_table[] = {
48 F81534A_SERIES_ID,
49 { } /* Terminating entry */
50 };
51
52 static const struct usb_device_id f81534a_ctrl_id_table[] = {
53 F81534A_CTRL_ID,
54 { } /* Terminating entry */
55 };
56
57 static const struct usb_device_id combined_id_table[] = {
58 F81232_ID,
59 F81534A_SERIES_ID,
60 F81534A_CTRL_ID,
61 { } /* Terminating entry */
62 };
63 MODULE_DEVICE_TABLE(usb, combined_id_table);
64
65 /* Maximum baudrate for F81232 */
66 #define F81232_MAX_BAUDRATE 1500000
67 #define F81232_DEF_BAUDRATE 9600
68
69 /* USB Control EP parameter */
70 #define F81232_REGISTER_REQUEST 0xa0
71 #define F81232_GET_REGISTER 0xc0
72 #define F81232_SET_REGISTER 0x40
73 #define F81534A_ACCESS_REG_RETRY 2
74
75 #define SERIAL_BASE_ADDRESS 0x0120
76 #define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
77 #define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
78 #define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
79 #define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
80 #define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
81 #define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
82 #define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
83
84 /*
85 * F81232 Clock registers (106h)
86 *
87 * Bit1-0: Clock source selector
88 * 00: 1.846MHz.
89 * 01: 18.46MHz.
90 * 10: 24MHz.
91 * 11: 14.77MHz.
92 */
93 #define F81232_CLK_REGISTER 0x106
94 #define F81232_CLK_1_846_MHZ 0
95 #define F81232_CLK_18_46_MHZ BIT(0)
96 #define F81232_CLK_24_MHZ BIT(1)
97 #define F81232_CLK_14_77_MHZ (BIT(1) | BIT(0))
98 #define F81232_CLK_MASK GENMASK(1, 0)
99
100 #define F81534A_MODE_REG 0x107
101 #define F81534A_TRIGGER_MASK GENMASK(3, 2)
102 #define F81534A_TRIGGER_MULTIPLE_4X BIT(3)
103 #define F81534A_FIFO_128BYTE (BIT(1) | BIT(0))
104
105 /* Serial port self GPIO control, 2bytes [control&output data][input data] */
106 #define F81534A_GPIO_REG 0x10e
107 #define F81534A_GPIO_MODE2_DIR BIT(6) /* 1: input, 0: output */
108 #define F81534A_GPIO_MODE1_DIR BIT(5)
109 #define F81534A_GPIO_MODE0_DIR BIT(4)
110 #define F81534A_GPIO_MODE2_OUTPUT BIT(2)
111 #define F81534A_GPIO_MODE1_OUTPUT BIT(1)
112 #define F81534A_GPIO_MODE0_OUTPUT BIT(0)
113
114 #define F81534A_CTRL_CMD_ENABLE_PORT 0x116
115
116 struct f81232_private {
117 struct mutex lock;
118 u8 modem_control;
119 u8 modem_status;
120 u8 shadow_lcr;
121 speed_t baud_base;
122 struct work_struct lsr_work;
123 struct work_struct interrupt_work;
124 struct usb_serial_port *port;
125 };
126
127 static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
128 static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
129 F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };
130
calc_baud_divisor(speed_t baudrate,speed_t clockrate)131 static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
132 {
133 return DIV_ROUND_CLOSEST(clockrate, baudrate);
134 }
135
f81232_get_register(struct usb_serial_port * port,u16 reg,u8 * val)136 static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
137 {
138 int status;
139 struct usb_device *dev = port->serial->dev;
140
141 status = usb_control_msg_recv(dev,
142 0,
143 F81232_REGISTER_REQUEST,
144 F81232_GET_REGISTER,
145 reg,
146 0,
147 val,
148 sizeof(*val),
149 USB_CTRL_GET_TIMEOUT,
150 GFP_KERNEL);
151 if (status) {
152 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
153 status = usb_translate_errors(status);
154 }
155
156 return status;
157 }
158
f81232_set_register(struct usb_serial_port * port,u16 reg,u8 val)159 static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
160 {
161 int status;
162 struct usb_device *dev = port->serial->dev;
163
164 status = usb_control_msg_send(dev,
165 0,
166 F81232_REGISTER_REQUEST,
167 F81232_SET_REGISTER,
168 reg,
169 0,
170 &val,
171 sizeof(val),
172 USB_CTRL_SET_TIMEOUT,
173 GFP_KERNEL);
174 if (status) {
175 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
176 status = usb_translate_errors(status);
177 }
178
179 return status;
180 }
181
f81232_set_mask_register(struct usb_serial_port * port,u16 reg,u8 mask,u8 val)182 static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
183 u8 mask, u8 val)
184 {
185 int status;
186 u8 tmp;
187
188 status = f81232_get_register(port, reg, &tmp);
189 if (status)
190 return status;
191
192 tmp = (tmp & ~mask) | (val & mask);
193
194 return f81232_set_register(port, reg, tmp);
195 }
196
f81232_read_msr(struct usb_serial_port * port)197 static void f81232_read_msr(struct usb_serial_port *port)
198 {
199 int status;
200 u8 current_msr;
201 struct tty_struct *tty;
202 struct f81232_private *priv = usb_get_serial_port_data(port);
203
204 mutex_lock(&priv->lock);
205 status = f81232_get_register(port, MODEM_STATUS_REGISTER,
206 ¤t_msr);
207 if (status) {
208 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
209 mutex_unlock(&priv->lock);
210 return;
211 }
212
213 if (!(current_msr & UART_MSR_ANY_DELTA)) {
214 mutex_unlock(&priv->lock);
215 return;
216 }
217
218 priv->modem_status = current_msr;
219
220 if (current_msr & UART_MSR_DCTS)
221 port->icount.cts++;
222 if (current_msr & UART_MSR_DDSR)
223 port->icount.dsr++;
224 if (current_msr & UART_MSR_TERI)
225 port->icount.rng++;
226 if (current_msr & UART_MSR_DDCD) {
227 port->icount.dcd++;
228 tty = tty_port_tty_get(&port->port);
229 if (tty) {
230 usb_serial_handle_dcd_change(port, tty,
231 current_msr & UART_MSR_DCD);
232
233 tty_kref_put(tty);
234 }
235 }
236
237 wake_up_interruptible(&port->port.delta_msr_wait);
238 mutex_unlock(&priv->lock);
239 }
240
f81232_set_mctrl(struct usb_serial_port * port,unsigned int set,unsigned int clear)241 static int f81232_set_mctrl(struct usb_serial_port *port,
242 unsigned int set, unsigned int clear)
243 {
244 u8 val;
245 int status;
246 struct f81232_private *priv = usb_get_serial_port_data(port);
247
248 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
249 return 0; /* no change */
250
251 /* 'set' takes precedence over 'clear' */
252 clear &= ~set;
253
254 /* force enable interrupt with OUT2 */
255 mutex_lock(&priv->lock);
256 val = UART_MCR_OUT2 | priv->modem_control;
257
258 if (clear & TIOCM_DTR)
259 val &= ~UART_MCR_DTR;
260
261 if (clear & TIOCM_RTS)
262 val &= ~UART_MCR_RTS;
263
264 if (set & TIOCM_DTR)
265 val |= UART_MCR_DTR;
266
267 if (set & TIOCM_RTS)
268 val |= UART_MCR_RTS;
269
270 dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
271 val, priv->modem_control);
272
273 status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
274 if (status) {
275 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
276 mutex_unlock(&priv->lock);
277 return status;
278 }
279
280 priv->modem_control = val;
281 mutex_unlock(&priv->lock);
282
283 return 0;
284 }
285
f81232_update_line_status(struct usb_serial_port * port,unsigned char * data,size_t actual_length)286 static void f81232_update_line_status(struct usb_serial_port *port,
287 unsigned char *data,
288 size_t actual_length)
289 {
290 struct f81232_private *priv = usb_get_serial_port_data(port);
291
292 if (!actual_length)
293 return;
294
295 switch (data[0] & 0x07) {
296 case 0x00: /* msr change */
297 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
298 schedule_work(&priv->interrupt_work);
299 break;
300 case 0x02: /* tx-empty */
301 break;
302 case 0x04: /* rx data available */
303 break;
304 case 0x06: /* lsr change */
305 /* we can forget it. the LSR will read from bulk-in */
306 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
307 break;
308 }
309 }
310
f81232_read_int_callback(struct urb * urb)311 static void f81232_read_int_callback(struct urb *urb)
312 {
313 struct usb_serial_port *port = urb->context;
314 unsigned char *data = urb->transfer_buffer;
315 unsigned int actual_length = urb->actual_length;
316 int status = urb->status;
317 int retval;
318
319 switch (status) {
320 case 0:
321 /* success */
322 break;
323 case -ECONNRESET:
324 case -ENOENT:
325 case -ESHUTDOWN:
326 /* this urb is terminated, clean up */
327 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
328 __func__, status);
329 return;
330 default:
331 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
332 __func__, status);
333 goto exit;
334 }
335
336 usb_serial_debug_data(&port->dev, __func__,
337 urb->actual_length, urb->transfer_buffer);
338
339 f81232_update_line_status(port, data, actual_length);
340
341 exit:
342 retval = usb_submit_urb(urb, GFP_ATOMIC);
343 if (retval)
344 dev_err(&urb->dev->dev,
345 "%s - usb_submit_urb failed with result %d\n",
346 __func__, retval);
347 }
348
f81232_handle_lsr(struct usb_serial_port * port,u8 lsr)349 static char f81232_handle_lsr(struct usb_serial_port *port, u8 lsr)
350 {
351 struct f81232_private *priv = usb_get_serial_port_data(port);
352 char tty_flag = TTY_NORMAL;
353
354 if (!(lsr & UART_LSR_BRK_ERROR_BITS))
355 return tty_flag;
356
357 if (lsr & UART_LSR_BI) {
358 tty_flag = TTY_BREAK;
359 port->icount.brk++;
360 usb_serial_handle_break(port);
361 } else if (lsr & UART_LSR_PE) {
362 tty_flag = TTY_PARITY;
363 port->icount.parity++;
364 } else if (lsr & UART_LSR_FE) {
365 tty_flag = TTY_FRAME;
366 port->icount.frame++;
367 }
368
369 if (lsr & UART_LSR_OE) {
370 port->icount.overrun++;
371 schedule_work(&priv->lsr_work);
372 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
373 }
374
375 return tty_flag;
376 }
377
f81232_process_read_urb(struct urb * urb)378 static void f81232_process_read_urb(struct urb *urb)
379 {
380 struct usb_serial_port *port = urb->context;
381 unsigned char *data = urb->transfer_buffer;
382 char tty_flag;
383 unsigned int i;
384 u8 lsr;
385
386 /*
387 * When opening the port we get a 1-byte packet with the current LSR,
388 * which we discard.
389 */
390 if ((urb->actual_length < 2) || (urb->actual_length % 2))
391 return;
392
393 /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
394
395 for (i = 0; i < urb->actual_length; i += 2) {
396 lsr = data[i];
397 tty_flag = f81232_handle_lsr(port, lsr);
398
399 if (port->sysrq) {
400 if (usb_serial_handle_sysrq_char(port, data[i + 1]))
401 continue;
402 }
403
404 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
405 }
406
407 tty_flip_buffer_push(&port->port);
408 }
409
f81534a_process_read_urb(struct urb * urb)410 static void f81534a_process_read_urb(struct urb *urb)
411 {
412 struct usb_serial_port *port = urb->context;
413 unsigned char *data = urb->transfer_buffer;
414 char tty_flag;
415 unsigned int i;
416 u8 lsr;
417 u8 len;
418
419 if (urb->actual_length < 3) {
420 dev_err(&port->dev, "short message received: %d\n",
421 urb->actual_length);
422 return;
423 }
424
425 len = data[0];
426 if (len != urb->actual_length) {
427 dev_err(&port->dev, "malformed message received: %d (%d)\n",
428 urb->actual_length, len);
429 return;
430 }
431
432 /* bulk-in data: [LEN][Data.....][LSR] */
433 lsr = data[len - 1];
434 tty_flag = f81232_handle_lsr(port, lsr);
435
436 if (port->sysrq) {
437 for (i = 1; i < len - 1; ++i) {
438 if (!usb_serial_handle_sysrq_char(port, data[i])) {
439 tty_insert_flip_char(&port->port, data[i],
440 tty_flag);
441 }
442 }
443 } else {
444 tty_insert_flip_string_fixed_flag(&port->port, &data[1],
445 tty_flag, len - 2);
446 }
447
448 tty_flip_buffer_push(&port->port);
449 }
450
f81232_break_ctl(struct tty_struct * tty,int break_state)451 static int f81232_break_ctl(struct tty_struct *tty, int break_state)
452 {
453 struct usb_serial_port *port = tty->driver_data;
454 struct f81232_private *priv = usb_get_serial_port_data(port);
455 int status;
456
457 mutex_lock(&priv->lock);
458
459 if (break_state)
460 priv->shadow_lcr |= UART_LCR_SBC;
461 else
462 priv->shadow_lcr &= ~UART_LCR_SBC;
463
464 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
465 priv->shadow_lcr);
466 if (status)
467 dev_err(&port->dev, "set break failed: %d\n", status);
468
469 mutex_unlock(&priv->lock);
470
471 return status;
472 }
473
f81232_find_clk(speed_t baudrate)474 static int f81232_find_clk(speed_t baudrate)
475 {
476 int idx;
477
478 for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
479 if (baudrate <= baudrate_table[idx] &&
480 baudrate_table[idx] % baudrate == 0)
481 return idx;
482 }
483
484 return -EINVAL;
485 }
486
f81232_set_baudrate(struct tty_struct * tty,struct usb_serial_port * port,speed_t baudrate,speed_t old_baudrate)487 static void f81232_set_baudrate(struct tty_struct *tty,
488 struct usb_serial_port *port, speed_t baudrate,
489 speed_t old_baudrate)
490 {
491 struct f81232_private *priv = usb_get_serial_port_data(port);
492 u8 lcr;
493 int divisor;
494 int status = 0;
495 int i;
496 int idx;
497 speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE };
498
499 for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
500 baudrate = baud_list[i];
501 if (baudrate == 0) {
502 tty_encode_baud_rate(tty, 0, 0);
503 return;
504 }
505
506 idx = f81232_find_clk(baudrate);
507 if (idx >= 0) {
508 tty_encode_baud_rate(tty, baudrate, baudrate);
509 break;
510 }
511 }
512
513 if (idx < 0)
514 return;
515
516 priv->baud_base = baudrate_table[idx];
517 divisor = calc_baud_divisor(baudrate, priv->baud_base);
518
519 status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
520 F81232_CLK_MASK, clock_table[idx]);
521 if (status) {
522 dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
523 __func__, status);
524 return;
525 }
526
527 status = f81232_get_register(port, LINE_CONTROL_REGISTER,
528 &lcr); /* get LCR */
529 if (status) {
530 dev_err(&port->dev, "%s failed to get LCR: %d\n",
531 __func__, status);
532 return;
533 }
534
535 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
536 lcr | UART_LCR_DLAB); /* Enable DLAB */
537 if (status) {
538 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
539 __func__, status);
540 return;
541 }
542
543 status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
544 divisor & 0x00ff); /* low */
545 if (status) {
546 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
547 __func__, status);
548 goto reapply_lcr;
549 }
550
551 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
552 (divisor & 0xff00) >> 8); /* high */
553 if (status) {
554 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
555 __func__, status);
556 }
557
558 reapply_lcr:
559 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
560 lcr & ~UART_LCR_DLAB);
561 if (status) {
562 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
563 __func__, status);
564 }
565 }
566
f81232_port_enable(struct usb_serial_port * port)567 static int f81232_port_enable(struct usb_serial_port *port)
568 {
569 u8 val;
570 int status;
571
572 /* fifo on, trigger8, clear TX/RX*/
573 val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
574 UART_FCR_CLEAR_XMIT;
575
576 status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
577 if (status) {
578 dev_err(&port->dev, "%s failed to set FCR: %d\n",
579 __func__, status);
580 return status;
581 }
582
583 /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
584 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
585 UART_IER_MSI);
586 if (status) {
587 dev_err(&port->dev, "%s failed to set IER: %d\n",
588 __func__, status);
589 return status;
590 }
591
592 return 0;
593 }
594
f81232_port_disable(struct usb_serial_port * port)595 static int f81232_port_disable(struct usb_serial_port *port)
596 {
597 int status;
598
599 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
600 if (status) {
601 dev_err(&port->dev, "%s failed to set IER: %d\n",
602 __func__, status);
603 return status;
604 }
605
606 return 0;
607 }
608
f81232_set_termios(struct tty_struct * tty,struct usb_serial_port * port,const struct ktermios * old_termios)609 static void f81232_set_termios(struct tty_struct *tty,
610 struct usb_serial_port *port,
611 const struct ktermios *old_termios)
612 {
613 struct f81232_private *priv = usb_get_serial_port_data(port);
614 u8 new_lcr = 0;
615 int status = 0;
616 speed_t baudrate;
617 speed_t old_baud;
618
619 /* Don't change anything if nothing has changed */
620 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
621 return;
622
623 if (C_BAUD(tty) == B0)
624 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
625 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
626 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
627
628 baudrate = tty_get_baud_rate(tty);
629 if (baudrate > 0) {
630 if (old_termios)
631 old_baud = tty_termios_baud_rate(old_termios);
632 else
633 old_baud = F81232_DEF_BAUDRATE;
634
635 f81232_set_baudrate(tty, port, baudrate, old_baud);
636 }
637
638 if (C_PARENB(tty)) {
639 new_lcr |= UART_LCR_PARITY;
640
641 if (!C_PARODD(tty))
642 new_lcr |= UART_LCR_EPAR;
643
644 if (C_CMSPAR(tty))
645 new_lcr |= UART_LCR_SPAR;
646 }
647
648 if (C_CSTOPB(tty))
649 new_lcr |= UART_LCR_STOP;
650
651 new_lcr |= UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
652
653 mutex_lock(&priv->lock);
654
655 new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
656 status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
657 if (status) {
658 dev_err(&port->dev, "%s failed to set LCR: %d\n",
659 __func__, status);
660 }
661
662 priv->shadow_lcr = new_lcr;
663
664 mutex_unlock(&priv->lock);
665 }
666
f81232_tiocmget(struct tty_struct * tty)667 static int f81232_tiocmget(struct tty_struct *tty)
668 {
669 int r;
670 struct usb_serial_port *port = tty->driver_data;
671 struct f81232_private *port_priv = usb_get_serial_port_data(port);
672 u8 mcr, msr;
673
674 /* force get current MSR changed state */
675 f81232_read_msr(port);
676
677 mutex_lock(&port_priv->lock);
678 mcr = port_priv->modem_control;
679 msr = port_priv->modem_status;
680 mutex_unlock(&port_priv->lock);
681
682 r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
683 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
684 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
685 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
686 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
687 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
688
689 return r;
690 }
691
f81232_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)692 static int f81232_tiocmset(struct tty_struct *tty,
693 unsigned int set, unsigned int clear)
694 {
695 struct usb_serial_port *port = tty->driver_data;
696
697 return f81232_set_mctrl(port, set, clear);
698 }
699
f81232_open(struct tty_struct * tty,struct usb_serial_port * port)700 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
701 {
702 int result;
703
704 result = f81232_port_enable(port);
705 if (result)
706 return result;
707
708 /* Setup termios */
709 if (tty)
710 f81232_set_termios(tty, port, NULL);
711
712 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
713 if (result) {
714 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
715 " error %d\n", __func__, result);
716 return result;
717 }
718
719 result = usb_serial_generic_open(tty, port);
720 if (result) {
721 usb_kill_urb(port->interrupt_in_urb);
722 return result;
723 }
724
725 return 0;
726 }
727
f81534a_open(struct tty_struct * tty,struct usb_serial_port * port)728 static int f81534a_open(struct tty_struct *tty, struct usb_serial_port *port)
729 {
730 int status;
731 u8 mask;
732 u8 val;
733
734 val = F81534A_TRIGGER_MULTIPLE_4X | F81534A_FIFO_128BYTE;
735 mask = F81534A_TRIGGER_MASK | F81534A_FIFO_128BYTE;
736
737 status = f81232_set_mask_register(port, F81534A_MODE_REG, mask, val);
738 if (status) {
739 dev_err(&port->dev, "failed to set MODE_REG: %d\n", status);
740 return status;
741 }
742
743 return f81232_open(tty, port);
744 }
745
f81232_close(struct usb_serial_port * port)746 static void f81232_close(struct usb_serial_port *port)
747 {
748 struct f81232_private *port_priv = usb_get_serial_port_data(port);
749
750 f81232_port_disable(port);
751 usb_serial_generic_close(port);
752 usb_kill_urb(port->interrupt_in_urb);
753 flush_work(&port_priv->interrupt_work);
754 flush_work(&port_priv->lsr_work);
755 }
756
f81232_dtr_rts(struct usb_serial_port * port,int on)757 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
758 {
759 if (on)
760 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
761 else
762 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
763 }
764
f81232_tx_empty(struct usb_serial_port * port)765 static bool f81232_tx_empty(struct usb_serial_port *port)
766 {
767 int status;
768 u8 tmp;
769
770 status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
771 if (!status) {
772 if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT)
773 return false;
774 }
775
776 return true;
777 }
778
f81232_carrier_raised(struct usb_serial_port * port)779 static int f81232_carrier_raised(struct usb_serial_port *port)
780 {
781 u8 msr;
782 struct f81232_private *priv = usb_get_serial_port_data(port);
783
784 mutex_lock(&priv->lock);
785 msr = priv->modem_status;
786 mutex_unlock(&priv->lock);
787
788 if (msr & UART_MSR_DCD)
789 return 1;
790 return 0;
791 }
792
f81232_get_serial(struct tty_struct * tty,struct serial_struct * ss)793 static void f81232_get_serial(struct tty_struct *tty, struct serial_struct *ss)
794 {
795 struct usb_serial_port *port = tty->driver_data;
796 struct f81232_private *priv = usb_get_serial_port_data(port);
797
798 ss->baud_base = priv->baud_base;
799 }
800
f81232_interrupt_work(struct work_struct * work)801 static void f81232_interrupt_work(struct work_struct *work)
802 {
803 struct f81232_private *priv =
804 container_of(work, struct f81232_private, interrupt_work);
805
806 f81232_read_msr(priv->port);
807 }
808
f81232_lsr_worker(struct work_struct * work)809 static void f81232_lsr_worker(struct work_struct *work)
810 {
811 struct f81232_private *priv;
812 struct usb_serial_port *port;
813 int status;
814 u8 tmp;
815
816 priv = container_of(work, struct f81232_private, lsr_work);
817 port = priv->port;
818
819 status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
820 if (status)
821 dev_warn(&port->dev, "read LSR failed: %d\n", status);
822 }
823
f81534a_ctrl_set_register(struct usb_interface * intf,u16 reg,u16 size,void * val)824 static int f81534a_ctrl_set_register(struct usb_interface *intf, u16 reg,
825 u16 size, void *val)
826 {
827 struct usb_device *dev = interface_to_usbdev(intf);
828 int retry = F81534A_ACCESS_REG_RETRY;
829 int status;
830
831 while (retry--) {
832 status = usb_control_msg_send(dev,
833 0,
834 F81232_REGISTER_REQUEST,
835 F81232_SET_REGISTER,
836 reg,
837 0,
838 val,
839 size,
840 USB_CTRL_SET_TIMEOUT,
841 GFP_KERNEL);
842 if (status) {
843 status = usb_translate_errors(status);
844 if (status == -EIO)
845 continue;
846 }
847
848 break;
849 }
850
851 if (status) {
852 dev_err(&intf->dev, "failed to set register 0x%x: %d\n",
853 reg, status);
854 }
855
856 return status;
857 }
858
f81534a_ctrl_enable_all_ports(struct usb_interface * intf,bool en)859 static int f81534a_ctrl_enable_all_ports(struct usb_interface *intf, bool en)
860 {
861 unsigned char enable[2] = {0};
862 int status;
863
864 /*
865 * Enable all available serial ports, define as following:
866 * bit 15 : Reset behavior (when HUB got soft reset)
867 * 0: maintain all serial port enabled state.
868 * 1: disable all serial port.
869 * bit 0~11 : Serial port enable bit.
870 */
871 if (en) {
872 enable[0] = 0xff;
873 enable[1] = 0x8f;
874 }
875
876 status = f81534a_ctrl_set_register(intf, F81534A_CTRL_CMD_ENABLE_PORT,
877 sizeof(enable), enable);
878 if (status)
879 dev_err(&intf->dev, "failed to enable ports: %d\n", status);
880
881 return status;
882 }
883
f81534a_ctrl_probe(struct usb_interface * intf,const struct usb_device_id * id)884 static int f81534a_ctrl_probe(struct usb_interface *intf,
885 const struct usb_device_id *id)
886 {
887 return f81534a_ctrl_enable_all_ports(intf, true);
888 }
889
f81534a_ctrl_disconnect(struct usb_interface * intf)890 static void f81534a_ctrl_disconnect(struct usb_interface *intf)
891 {
892 f81534a_ctrl_enable_all_ports(intf, false);
893 }
894
f81534a_ctrl_resume(struct usb_interface * intf)895 static int f81534a_ctrl_resume(struct usb_interface *intf)
896 {
897 return f81534a_ctrl_enable_all_ports(intf, true);
898 }
899
f81232_port_probe(struct usb_serial_port * port)900 static int f81232_port_probe(struct usb_serial_port *port)
901 {
902 struct f81232_private *priv;
903
904 priv = devm_kzalloc(&port->dev, sizeof(*priv), GFP_KERNEL);
905 if (!priv)
906 return -ENOMEM;
907
908 mutex_init(&priv->lock);
909 INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
910 INIT_WORK(&priv->lsr_work, f81232_lsr_worker);
911
912 usb_set_serial_port_data(port, priv);
913
914 priv->port = port;
915
916 return 0;
917 }
918
f81534a_port_probe(struct usb_serial_port * port)919 static int f81534a_port_probe(struct usb_serial_port *port)
920 {
921 int status;
922
923 /* tri-state with pull-high, default RS232 Mode */
924 status = f81232_set_register(port, F81534A_GPIO_REG,
925 F81534A_GPIO_MODE2_DIR);
926 if (status)
927 return status;
928
929 return f81232_port_probe(port);
930 }
931
f81232_suspend(struct usb_serial * serial,pm_message_t message)932 static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
933 {
934 struct usb_serial_port *port = serial->port[0];
935 struct f81232_private *port_priv = usb_get_serial_port_data(port);
936 int i;
937
938 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
939 usb_kill_urb(port->read_urbs[i]);
940
941 usb_kill_urb(port->interrupt_in_urb);
942
943 if (port_priv) {
944 flush_work(&port_priv->interrupt_work);
945 flush_work(&port_priv->lsr_work);
946 }
947
948 return 0;
949 }
950
f81232_resume(struct usb_serial * serial)951 static int f81232_resume(struct usb_serial *serial)
952 {
953 struct usb_serial_port *port = serial->port[0];
954 int result;
955
956 if (tty_port_initialized(&port->port)) {
957 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
958 if (result) {
959 dev_err(&port->dev, "submit interrupt urb failed: %d\n",
960 result);
961 return result;
962 }
963 }
964
965 return usb_serial_generic_resume(serial);
966 }
967
968 static struct usb_serial_driver f81232_device = {
969 .driver = {
970 .name = "f81232",
971 },
972 .id_table = f81232_id_table,
973 .num_ports = 1,
974 .bulk_in_size = 256,
975 .bulk_out_size = 256,
976 .open = f81232_open,
977 .close = f81232_close,
978 .dtr_rts = f81232_dtr_rts,
979 .carrier_raised = f81232_carrier_raised,
980 .get_serial = f81232_get_serial,
981 .break_ctl = f81232_break_ctl,
982 .set_termios = f81232_set_termios,
983 .tiocmget = f81232_tiocmget,
984 .tiocmset = f81232_tiocmset,
985 .tiocmiwait = usb_serial_generic_tiocmiwait,
986 .tx_empty = f81232_tx_empty,
987 .process_read_urb = f81232_process_read_urb,
988 .read_int_callback = f81232_read_int_callback,
989 .port_probe = f81232_port_probe,
990 .suspend = f81232_suspend,
991 .resume = f81232_resume,
992 };
993
994 static struct usb_serial_driver f81534a_device = {
995 .driver = {
996 .name = "f81534a",
997 },
998 .id_table = f81534a_id_table,
999 .num_ports = 1,
1000 .open = f81534a_open,
1001 .close = f81232_close,
1002 .dtr_rts = f81232_dtr_rts,
1003 .carrier_raised = f81232_carrier_raised,
1004 .get_serial = f81232_get_serial,
1005 .break_ctl = f81232_break_ctl,
1006 .set_termios = f81232_set_termios,
1007 .tiocmget = f81232_tiocmget,
1008 .tiocmset = f81232_tiocmset,
1009 .tiocmiwait = usb_serial_generic_tiocmiwait,
1010 .tx_empty = f81232_tx_empty,
1011 .process_read_urb = f81534a_process_read_urb,
1012 .read_int_callback = f81232_read_int_callback,
1013 .port_probe = f81534a_port_probe,
1014 .suspend = f81232_suspend,
1015 .resume = f81232_resume,
1016 };
1017
1018 static struct usb_serial_driver * const serial_drivers[] = {
1019 &f81232_device,
1020 &f81534a_device,
1021 NULL,
1022 };
1023
1024 static struct usb_driver f81534a_ctrl_driver = {
1025 .name = "f81534a_ctrl",
1026 .id_table = f81534a_ctrl_id_table,
1027 .probe = f81534a_ctrl_probe,
1028 .disconnect = f81534a_ctrl_disconnect,
1029 .resume = f81534a_ctrl_resume,
1030 };
1031
f81232_init(void)1032 static int __init f81232_init(void)
1033 {
1034 int status;
1035
1036 status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE,
1037 KBUILD_MODNAME);
1038 if (status)
1039 return status;
1040
1041 status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME,
1042 combined_id_table);
1043 if (status) {
1044 usb_deregister(&f81534a_ctrl_driver);
1045 return status;
1046 }
1047
1048 return 0;
1049 }
1050
f81232_exit(void)1051 static void __exit f81232_exit(void)
1052 {
1053 usb_serial_deregister_drivers(serial_drivers);
1054 usb_deregister(&f81534a_ctrl_driver);
1055 }
1056
1057 module_init(f81232_init);
1058 module_exit(f81232_exit);
1059
1060 MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
1061 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
1062 MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
1063 MODULE_LICENSE("GPL v2");
1064