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 | |
131 | static int calc_baud_divisor(speed_t baudrate, speed_t clockrate) |
132 | { |
133 | return DIV_ROUND_CLOSEST(clockrate, baudrate); |
134 | } |
135 | |
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 | endpoint: 0, |
143 | F81232_REGISTER_REQUEST, |
144 | F81232_GET_REGISTER, |
145 | value: reg, |
146 | index: 0, |
147 | data: val, |
148 | size: 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(error_code: status); |
154 | } |
155 | |
156 | return status; |
157 | } |
158 | |
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 | endpoint: 0, |
166 | F81232_REGISTER_REQUEST, |
167 | F81232_SET_REGISTER, |
168 | value: reg, |
169 | index: 0, |
170 | data: &val, |
171 | size: 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(error_code: status); |
177 | } |
178 | |
179 | return status; |
180 | } |
181 | |
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, val: &tmp); |
189 | if (status) |
190 | return status; |
191 | |
192 | tmp = (tmp & ~mask) | (val & mask); |
193 | |
194 | return f81232_set_register(port, reg, val: tmp); |
195 | } |
196 | |
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 | val: ¤t_msr); |
207 | if (status) { |
208 | dev_err(&port->dev, "%s fail, status: %d\n" , __func__, status); |
209 | mutex_unlock(lock: &priv->lock); |
210 | return; |
211 | } |
212 | |
213 | if (!(current_msr & UART_MSR_ANY_DELTA)) { |
214 | mutex_unlock(lock: &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->port); |
229 | if (tty) { |
230 | usb_serial_handle_dcd_change(usb_port: port, tty, |
231 | status: 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(lock: &priv->lock); |
239 | } |
240 | |
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(lock: &priv->lock); |
277 | return status; |
278 | } |
279 | |
280 | priv->modem_control = val; |
281 | mutex_unlock(lock: &priv->lock); |
282 | |
283 | return 0; |
284 | } |
285 | |
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(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 | |
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(dev: &port->dev, function: __func__, |
337 | size: urb->actual_length, data: 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 | |
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(work: &priv->lsr_work); |
372 | tty_insert_flip_char(port: &port->port, ch: 0, TTY_OVERRUN); |
373 | } |
374 | |
375 | return tty_flag; |
376 | } |
377 | |
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, ch: data[i + 1])) |
401 | continue; |
402 | } |
403 | |
404 | tty_insert_flip_char(port: &port->port, ch: data[i + 1], flag: tty_flag); |
405 | } |
406 | |
407 | tty_flip_buffer_push(port: &port->port); |
408 | } |
409 | |
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, ch: data[i])) { |
439 | tty_insert_flip_char(port: &port->port, ch: data[i], |
440 | flag: tty_flag); |
441 | } |
442 | } |
443 | } else { |
444 | tty_insert_flip_string_fixed_flag(port: &port->port, chars: &data[1], |
445 | flag: tty_flag, size: len - 2); |
446 | } |
447 | |
448 | tty_flip_buffer_push(port: &port->port); |
449 | } |
450 | |
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 | val: priv->shadow_lcr); |
466 | if (status) |
467 | dev_err(&port->dev, "set break failed: %d\n" , status); |
468 | |
469 | mutex_unlock(lock: &priv->lock); |
470 | |
471 | return status; |
472 | } |
473 | |
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 | |
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, ibaud: 0, obaud: 0); |
503 | return; |
504 | } |
505 | |
506 | idx = f81232_find_clk(baudrate); |
507 | if (idx >= 0) { |
508 | tty_encode_baud_rate(tty, ibaud: baudrate, obaud: 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, clockrate: priv->baud_base); |
518 | |
519 | status = f81232_set_mask_register(port, F81232_CLK_REGISTER, |
520 | F81232_CLK_MASK, val: 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 | val: &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 | val: 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 | val: 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 | val: (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 | val: 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 | |
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 | |
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, val: 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 | |
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(a: &tty->termios, b: old_termios)) |
621 | return; |
622 | |
623 | if (C_BAUD(tty) == B0) |
624 | f81232_set_mctrl(port, set: 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, clear: 0); |
627 | |
628 | baudrate = tty_get_baud_rate(tty); |
629 | if (baudrate > 0) { |
630 | if (old_termios) |
631 | old_baud = tty_termios_baud_rate(termios: old_termios); |
632 | else |
633 | old_baud = F81232_DEF_BAUDRATE; |
634 | |
635 | f81232_set_baudrate(tty, port, baudrate, old_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, val: 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(lock: &priv->lock); |
665 | } |
666 | |
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(lock: &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 | |
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 | |
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(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(urb: port->interrupt_in_urb); |
722 | return result; |
723 | } |
724 | |
725 | return 0; |
726 | } |
727 | |
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 | |
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(urb: port->interrupt_in_urb); |
753 | flush_work(work: &port_priv->interrupt_work); |
754 | flush_work(work: &port_priv->lsr_work); |
755 | } |
756 | |
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, clear: 0); |
761 | else |
762 | f81232_set_mctrl(port, set: 0, TIOCM_DTR | TIOCM_RTS); |
763 | } |
764 | |
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, val: &tmp); |
771 | if (!status) { |
772 | if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT) |
773 | return false; |
774 | } |
775 | |
776 | return true; |
777 | } |
778 | |
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(lock: &priv->lock); |
787 | |
788 | if (msr & UART_MSR_DCD) |
789 | return 1; |
790 | return 0; |
791 | } |
792 | |
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 | |
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(port: priv->port); |
807 | } |
808 | |
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, val: &tmp); |
820 | if (status) |
821 | dev_warn(&port->dev, "read LSR failed: %d\n" , status); |
822 | } |
823 | |
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 | endpoint: 0, |
834 | F81232_REGISTER_REQUEST, |
835 | F81232_SET_REGISTER, |
836 | value: reg, |
837 | index: 0, |
838 | data: val, |
839 | size, |
840 | USB_CTRL_SET_TIMEOUT, |
841 | GFP_KERNEL); |
842 | if (status) { |
843 | status = usb_translate_errors(error_code: 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 | |
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 | size: sizeof(enable), val: enable); |
878 | if (status) |
879 | dev_err(&intf->dev, "failed to enable ports: %d\n" , status); |
880 | |
881 | return status; |
882 | } |
883 | |
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, en: true); |
888 | } |
889 | |
890 | static void f81534a_ctrl_disconnect(struct usb_interface *intf) |
891 | { |
892 | f81534a_ctrl_enable_all_ports(intf, en: false); |
893 | } |
894 | |
895 | static int f81534a_ctrl_resume(struct usb_interface *intf) |
896 | { |
897 | return f81534a_ctrl_enable_all_ports(intf, en: true); |
898 | } |
899 | |
900 | static int f81232_port_probe(struct usb_serial_port *port) |
901 | { |
902 | struct f81232_private *priv; |
903 | |
904 | priv = devm_kzalloc(dev: &port->dev, size: 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, data: priv); |
913 | |
914 | priv->port = port; |
915 | |
916 | return 0; |
917 | } |
918 | |
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 | |
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(urb: port->read_urbs[i]); |
940 | |
941 | usb_kill_urb(urb: port->interrupt_in_urb); |
942 | |
943 | if (port_priv) { |
944 | flush_work(work: &port_priv->interrupt_work); |
945 | flush_work(work: &port_priv->lsr_work); |
946 | } |
947 | |
948 | return 0; |
949 | } |
950 | |
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->port)) { |
957 | result = usb_submit_urb(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 | .owner = THIS_MODULE, |
971 | .name = "f81232" , |
972 | }, |
973 | .id_table = f81232_id_table, |
974 | .num_ports = 1, |
975 | .bulk_in_size = 256, |
976 | .bulk_out_size = 256, |
977 | .open = f81232_open, |
978 | .close = f81232_close, |
979 | .dtr_rts = f81232_dtr_rts, |
980 | .carrier_raised = f81232_carrier_raised, |
981 | .get_serial = f81232_get_serial, |
982 | .break_ctl = f81232_break_ctl, |
983 | .set_termios = f81232_set_termios, |
984 | .tiocmget = f81232_tiocmget, |
985 | .tiocmset = f81232_tiocmset, |
986 | .tiocmiwait = usb_serial_generic_tiocmiwait, |
987 | .tx_empty = f81232_tx_empty, |
988 | .process_read_urb = f81232_process_read_urb, |
989 | .read_int_callback = f81232_read_int_callback, |
990 | .port_probe = f81232_port_probe, |
991 | .suspend = f81232_suspend, |
992 | .resume = f81232_resume, |
993 | }; |
994 | |
995 | static struct usb_serial_driver f81534a_device = { |
996 | .driver = { |
997 | .owner = THIS_MODULE, |
998 | .name = "f81534a" , |
999 | }, |
1000 | .id_table = f81534a_id_table, |
1001 | .num_ports = 1, |
1002 | .open = f81534a_open, |
1003 | .close = f81232_close, |
1004 | .dtr_rts = f81232_dtr_rts, |
1005 | .carrier_raised = f81232_carrier_raised, |
1006 | .get_serial = f81232_get_serial, |
1007 | .break_ctl = f81232_break_ctl, |
1008 | .set_termios = f81232_set_termios, |
1009 | .tiocmget = f81232_tiocmget, |
1010 | .tiocmset = f81232_tiocmset, |
1011 | .tiocmiwait = usb_serial_generic_tiocmiwait, |
1012 | .tx_empty = f81232_tx_empty, |
1013 | .process_read_urb = f81534a_process_read_urb, |
1014 | .read_int_callback = f81232_read_int_callback, |
1015 | .port_probe = f81534a_port_probe, |
1016 | .suspend = f81232_suspend, |
1017 | .resume = f81232_resume, |
1018 | }; |
1019 | |
1020 | static struct usb_serial_driver * const serial_drivers[] = { |
1021 | &f81232_device, |
1022 | &f81534a_device, |
1023 | NULL, |
1024 | }; |
1025 | |
1026 | static struct usb_driver f81534a_ctrl_driver = { |
1027 | .name = "f81534a_ctrl" , |
1028 | .id_table = f81534a_ctrl_id_table, |
1029 | .probe = f81534a_ctrl_probe, |
1030 | .disconnect = f81534a_ctrl_disconnect, |
1031 | .resume = f81534a_ctrl_resume, |
1032 | }; |
1033 | |
1034 | static int __init f81232_init(void) |
1035 | { |
1036 | int status; |
1037 | |
1038 | status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE, |
1039 | KBUILD_MODNAME); |
1040 | if (status) |
1041 | return status; |
1042 | |
1043 | status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME, |
1044 | id_table: combined_id_table); |
1045 | if (status) { |
1046 | usb_deregister(&f81534a_ctrl_driver); |
1047 | return status; |
1048 | } |
1049 | |
1050 | return 0; |
1051 | } |
1052 | |
1053 | static void __exit f81232_exit(void) |
1054 | { |
1055 | usb_serial_deregister_drivers(serial_drivers); |
1056 | usb_deregister(&f81534a_ctrl_driver); |
1057 | } |
1058 | |
1059 | module_init(f81232_init); |
1060 | module_exit(f81232_exit); |
1061 | |
1062 | MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver" ); |
1063 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>" ); |
1064 | MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>" ); |
1065 | MODULE_LICENSE("GPL v2" ); |
1066 | |