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1 | /* |
2 | * | |
3 | * Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * | |
11 | * Notes: the MAX3100 doesn't provide an interrupt on CTS so we have | |
12 | * to use polling for flow control. TX empty IRQ is unusable, since | |
13 | * writing conf clears FIFO buffer and we cannot have this interrupt | |
14 | * always asking us for attention. | |
15 | * | |
16 | * Example platform data: | |
17 | ||
18 | static struct plat_max3100 max3100_plat_data = { | |
19 | .loopback = 0, | |
20 | .crystal = 0, | |
21 | .poll_time = 100, | |
22 | }; | |
23 | ||
24 | static struct spi_board_info spi_board_info[] = { | |
25 | { | |
26 | .modalias = "max3100", | |
27 | .platform_data = &max3100_plat_data, | |
28 | .irq = IRQ_EINT12, | |
29 | .max_speed_hz = 5*1000*1000, | |
30 | .chip_select = 0, | |
31 | }, | |
32 | }; | |
33 | ||
34 | * The initial minor number is 209 in the low-density serial port: | |
35 | * mknod /dev/ttyMAX0 c 204 209 | |
36 | */ | |
37 | ||
38 | #define MAX3100_MAJOR 204 | |
39 | #define MAX3100_MINOR 209 | |
40 | /* 4 MAX3100s should be enough for everyone */ | |
41 | #define MAX_MAX3100 4 | |
42 | ||
43 | #include <linux/delay.h> | |
44 | #include <linux/device.h> | |
45 | #include <linux/serial_core.h> | |
46 | #include <linux/serial.h> | |
47 | #include <linux/spi/spi.h> | |
48 | #include <linux/freezer.h> | |
49 | ||
50 | #include <linux/serial_max3100.h> | |
51 | ||
52 | #define MAX3100_C (1<<14) | |
53 | #define MAX3100_D (0<<14) | |
54 | #define MAX3100_W (1<<15) | |
55 | #define MAX3100_RX (0<<15) | |
56 | ||
57 | #define MAX3100_WC (MAX3100_W | MAX3100_C) | |
58 | #define MAX3100_RC (MAX3100_RX | MAX3100_C) | |
59 | #define MAX3100_WD (MAX3100_W | MAX3100_D) | |
60 | #define MAX3100_RD (MAX3100_RX | MAX3100_D) | |
61 | #define MAX3100_CMD (3 << 14) | |
62 | ||
63 | #define MAX3100_T (1<<14) | |
64 | #define MAX3100_R (1<<15) | |
65 | ||
66 | #define MAX3100_FEN (1<<13) | |
67 | #define MAX3100_SHDN (1<<12) | |
68 | #define MAX3100_TM (1<<11) | |
69 | #define MAX3100_RM (1<<10) | |
70 | #define MAX3100_PM (1<<9) | |
71 | #define MAX3100_RAM (1<<8) | |
72 | #define MAX3100_IR (1<<7) | |
73 | #define MAX3100_ST (1<<6) | |
74 | #define MAX3100_PE (1<<5) | |
75 | #define MAX3100_L (1<<4) | |
76 | #define MAX3100_BAUD (0xf) | |
77 | ||
78 | #define MAX3100_TE (1<<10) | |
79 | #define MAX3100_RAFE (1<<10) | |
80 | #define MAX3100_RTS (1<<9) | |
81 | #define MAX3100_CTS (1<<9) | |
82 | #define MAX3100_PT (1<<8) | |
83 | #define MAX3100_DATA (0xff) | |
84 | ||
85 | #define MAX3100_RT (MAX3100_R | MAX3100_T) | |
86 | #define MAX3100_RTC (MAX3100_RT | MAX3100_CTS | MAX3100_RAFE) | |
87 | ||
88 | /* the following simulate a status reg for ignore_status_mask */ | |
89 | #define MAX3100_STATUS_PE 1 | |
90 | #define MAX3100_STATUS_FE 2 | |
91 | #define MAX3100_STATUS_OE 4 | |
92 | ||
93 | struct max3100_port { | |
94 | struct uart_port port; | |
95 | struct spi_device *spi; | |
96 | ||
97 | int cts; /* last CTS received for flow ctrl */ | |
98 | int tx_empty; /* last TX empty bit */ | |
99 | ||
100 | spinlock_t conf_lock; /* shared data */ | |
101 | int conf_commit; /* need to make changes */ | |
102 | int conf; /* configuration for the MAX31000 | |
103 | * (bits 0-7, bits 8-11 are irqs) */ | |
104 | int rts_commit; /* need to change rts */ | |
105 | int rts; /* rts status */ | |
106 | int baud; /* current baud rate */ | |
107 | ||
108 | int parity; /* keeps track if we should send parity */ | |
109 | #define MAX3100_PARITY_ON 1 | |
110 | #define MAX3100_PARITY_ODD 2 | |
111 | #define MAX3100_7BIT 4 | |
112 | int rx_enabled; /* if we should rx chars */ | |
113 | ||
114 | int irq; /* irq assigned to the max3100 */ | |
115 | ||
116 | int minor; /* minor number */ | |
117 | int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */ | |
118 | int loopback; /* 1 if we are in loopback mode */ | |
119 | ||
120 | /* for handling irqs: need workqueue since we do spi_sync */ | |
121 | struct workqueue_struct *workqueue; | |
122 | struct work_struct work; | |
123 | /* set to 1 to make the workhandler exit as soon as possible */ | |
124 | int force_end_work; | |
125 | /* need to know we are suspending to avoid deadlock on workqueue */ | |
126 | int suspending; | |
127 | ||
128 | /* hook for suspending MAX3100 via dedicated pin */ | |
129 | void (*max3100_hw_suspend) (int suspend); | |
130 | ||
131 | /* poll time (in ms) for ctrl lines */ | |
132 | int poll_time; | |
133 | /* and its timer */ | |
134 | struct timer_list timer; | |
135 | }; | |
136 | ||
137 | static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */ | |
138 | static DEFINE_MUTEX(max3100s_lock); /* race on probe */ | |
139 | ||
140 | static int max3100_do_parity(struct max3100_port *s, u16 c) | |
141 | { | |
142 | int parity; | |
143 | ||
144 | if (s->parity & MAX3100_PARITY_ODD) | |
145 | parity = 1; | |
146 | else | |
147 | parity = 0; | |
148 | ||
149 | if (s->parity & MAX3100_7BIT) | |
150 | c &= 0x7f; | |
151 | else | |
152 | c &= 0xff; | |
153 | ||
154 | parity = parity ^ (hweight8(c) & 1); | |
155 | return parity; | |
156 | } | |
157 | ||
158 | static int max3100_check_parity(struct max3100_port *s, u16 c) | |
159 | { | |
160 | return max3100_do_parity(s, c) == ((c >> 8) & 1); | |
161 | } | |
162 | ||
163 | static void max3100_calc_parity(struct max3100_port *s, u16 *c) | |
164 | { | |
165 | if (s->parity & MAX3100_7BIT) | |
166 | *c &= 0x7f; | |
167 | else | |
168 | *c &= 0xff; | |
169 | ||
170 | if (s->parity & MAX3100_PARITY_ON) | |
171 | *c |= max3100_do_parity(s, *c) << 8; | |
172 | } | |
173 | ||
174 | static void max3100_work(struct work_struct *w); | |
175 | ||
176 | static void max3100_dowork(struct max3100_port *s) | |
177 | { | |
178 | if (!s->force_end_work && !work_pending(&s->work) && | |
179 | !freezing(current) && !s->suspending) | |
180 | queue_work(s->workqueue, &s->work); | |
181 | } | |
182 | ||
183 | static void max3100_timeout(unsigned long data) | |
184 | { | |
185 | struct max3100_port *s = (struct max3100_port *)data; | |
186 | ||
187 | if (s->port.info) { | |
188 | max3100_dowork(s); | |
189 | mod_timer(&s->timer, jiffies + s->poll_time); | |
190 | } | |
191 | } | |
192 | ||
193 | static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) | |
194 | { | |
195 | struct spi_message message; | |
196 | u16 etx, erx; | |
197 | int status; | |
198 | struct spi_transfer tran = { | |
199 | .tx_buf = &etx, | |
200 | .rx_buf = &erx, | |
201 | .len = 2, | |
202 | }; | |
203 | ||
204 | etx = cpu_to_be16(tx); | |
205 | spi_message_init(&message); | |
206 | spi_message_add_tail(&tran, &message); | |
207 | status = spi_sync(s->spi, &message); | |
208 | if (status) { | |
209 | dev_warn(&s->spi->dev, "error while calling spi_sync\n"); | |
210 | return -EIO; | |
211 | } | |
212 | *rx = be16_to_cpu(erx); | |
213 | s->tx_empty = (*rx & MAX3100_T) > 0; | |
214 | dev_dbg(&s->spi->dev, "%04x - %04x\n", tx, *rx); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int max3100_handlerx(struct max3100_port *s, u16 rx) | |
219 | { | |
220 | unsigned int ch, flg, status = 0; | |
221 | int ret = 0, cts; | |
222 | ||
223 | if (rx & MAX3100_R && s->rx_enabled) { | |
224 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
225 | ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff); | |
226 | if (rx & MAX3100_RAFE) { | |
227 | s->port.icount.frame++; | |
228 | flg = TTY_FRAME; | |
229 | status |= MAX3100_STATUS_FE; | |
230 | } else { | |
231 | if (s->parity & MAX3100_PARITY_ON) { | |
232 | if (max3100_check_parity(s, rx)) { | |
233 | s->port.icount.rx++; | |
234 | flg = TTY_NORMAL; | |
235 | } else { | |
236 | s->port.icount.parity++; | |
237 | flg = TTY_PARITY; | |
238 | status |= MAX3100_STATUS_PE; | |
239 | } | |
240 | } else { | |
241 | s->port.icount.rx++; | |
242 | flg = TTY_NORMAL; | |
243 | } | |
244 | } | |
245 | uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg); | |
246 | ret = 1; | |
247 | } | |
248 | ||
249 | cts = (rx & MAX3100_CTS) > 0; | |
250 | if (s->cts != cts) { | |
251 | s->cts = cts; | |
252 | uart_handle_cts_change(&s->port, cts ? TIOCM_CTS : 0); | |
253 | } | |
254 | ||
255 | return ret; | |
256 | } | |
257 | ||
258 | static void max3100_work(struct work_struct *w) | |
259 | { | |
260 | struct max3100_port *s = container_of(w, struct max3100_port, work); | |
261 | int rxchars; | |
262 | u16 tx, rx; | |
263 | int conf, cconf, rts, crts; | |
264 | struct circ_buf *xmit = &s->port.info->xmit; | |
265 | ||
266 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
267 | ||
268 | rxchars = 0; | |
269 | do { | |
270 | spin_lock(&s->conf_lock); | |
271 | conf = s->conf; | |
272 | cconf = s->conf_commit; | |
273 | s->conf_commit = 0; | |
274 | rts = s->rts; | |
275 | crts = s->rts_commit; | |
276 | s->rts_commit = 0; | |
277 | spin_unlock(&s->conf_lock); | |
278 | if (cconf) | |
279 | max3100_sr(s, MAX3100_WC | conf, &rx); | |
280 | if (crts) { | |
281 | max3100_sr(s, MAX3100_WD | MAX3100_TE | | |
282 | (s->rts ? MAX3100_RTS : 0), &rx); | |
283 | rxchars += max3100_handlerx(s, rx); | |
284 | } | |
285 | ||
286 | max3100_sr(s, MAX3100_RD, &rx); | |
287 | rxchars += max3100_handlerx(s, rx); | |
288 | ||
289 | if (rx & MAX3100_T) { | |
290 | tx = 0xffff; | |
291 | if (s->port.x_char) { | |
292 | tx = s->port.x_char; | |
293 | s->port.icount.tx++; | |
294 | s->port.x_char = 0; | |
295 | } else if (!uart_circ_empty(xmit) && | |
296 | !uart_tx_stopped(&s->port)) { | |
297 | tx = xmit->buf[xmit->tail]; | |
298 | xmit->tail = (xmit->tail + 1) & | |
299 | (UART_XMIT_SIZE - 1); | |
300 | s->port.icount.tx++; | |
301 | } | |
302 | if (tx != 0xffff) { | |
303 | max3100_calc_parity(s, &tx); | |
304 | tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0); | |
305 | max3100_sr(s, tx, &rx); | |
306 | rxchars += max3100_handlerx(s, rx); | |
307 | } | |
308 | } | |
309 | ||
310 | if (rxchars > 16 && s->port.info->port.tty != NULL) { | |
311 | tty_flip_buffer_push(s->port.info->port.tty); | |
312 | rxchars = 0; | |
313 | } | |
314 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) | |
315 | uart_write_wakeup(&s->port); | |
316 | ||
317 | } while (!s->force_end_work && | |
318 | !freezing(current) && | |
319 | ((rx & MAX3100_R) || | |
320 | (!uart_circ_empty(xmit) && | |
321 | !uart_tx_stopped(&s->port)))); | |
322 | ||
323 | if (rxchars > 0 && s->port.info->port.tty != NULL) | |
324 | tty_flip_buffer_push(s->port.info->port.tty); | |
325 | } | |
326 | ||
327 | static irqreturn_t max3100_irq(int irqno, void *dev_id) | |
328 | { | |
329 | struct max3100_port *s = dev_id; | |
330 | ||
331 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
332 | ||
333 | max3100_dowork(s); | |
334 | return IRQ_HANDLED; | |
335 | } | |
336 | ||
337 | static void max3100_enable_ms(struct uart_port *port) | |
338 | { | |
339 | struct max3100_port *s = container_of(port, | |
340 | struct max3100_port, | |
341 | port); | |
342 | ||
343 | if (s->poll_time > 0) | |
344 | mod_timer(&s->timer, jiffies); | |
345 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
346 | } | |
347 | ||
348 | static void max3100_start_tx(struct uart_port *port) | |
349 | { | |
350 | struct max3100_port *s = container_of(port, | |
351 | struct max3100_port, | |
352 | port); | |
353 | ||
354 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
355 | ||
356 | max3100_dowork(s); | |
357 | } | |
358 | ||
359 | static void max3100_stop_rx(struct uart_port *port) | |
360 | { | |
361 | struct max3100_port *s = container_of(port, | |
362 | struct max3100_port, | |
363 | port); | |
364 | ||
365 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
366 | ||
367 | s->rx_enabled = 0; | |
368 | spin_lock(&s->conf_lock); | |
369 | s->conf &= ~MAX3100_RM; | |
370 | s->conf_commit = 1; | |
371 | spin_unlock(&s->conf_lock); | |
372 | max3100_dowork(s); | |
373 | } | |
374 | ||
375 | static unsigned int max3100_tx_empty(struct uart_port *port) | |
376 | { | |
377 | struct max3100_port *s = container_of(port, | |
378 | struct max3100_port, | |
379 | port); | |
380 | ||
381 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
382 | ||
383 | /* may not be truly up-to-date */ | |
384 | max3100_dowork(s); | |
385 | return s->tx_empty; | |
386 | } | |
387 | ||
388 | static unsigned int max3100_get_mctrl(struct uart_port *port) | |
389 | { | |
390 | struct max3100_port *s = container_of(port, | |
391 | struct max3100_port, | |
392 | port); | |
393 | ||
394 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
395 | ||
396 | /* may not be truly up-to-date */ | |
397 | max3100_dowork(s); | |
398 | /* always assert DCD and DSR since these lines are not wired */ | |
399 | return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR; | |
400 | } | |
401 | ||
402 | static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) | |
403 | { | |
404 | struct max3100_port *s = container_of(port, | |
405 | struct max3100_port, | |
406 | port); | |
407 | int rts; | |
408 | ||
409 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
410 | ||
411 | rts = (mctrl & TIOCM_RTS) > 0; | |
412 | ||
413 | spin_lock(&s->conf_lock); | |
414 | if (s->rts != rts) { | |
415 | s->rts = rts; | |
416 | s->rts_commit = 1; | |
417 | max3100_dowork(s); | |
418 | } | |
419 | spin_unlock(&s->conf_lock); | |
420 | } | |
421 | ||
422 | static void | |
423 | max3100_set_termios(struct uart_port *port, struct ktermios *termios, | |
424 | struct ktermios *old) | |
425 | { | |
426 | struct max3100_port *s = container_of(port, | |
427 | struct max3100_port, | |
428 | port); | |
429 | int baud = 0; | |
430 | unsigned cflag; | |
431 | u32 param_new, param_mask, parity = 0; | |
432 | struct tty_struct *tty = s->port.info->port.tty; | |
433 | ||
434 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
435 | if (!tty) | |
436 | return; | |
437 | ||
438 | cflag = termios->c_cflag; | |
439 | param_new = 0; | |
440 | param_mask = 0; | |
441 | ||
442 | baud = tty_get_baud_rate(tty); | |
443 | param_new = s->conf & MAX3100_BAUD; | |
444 | switch (baud) { | |
445 | case 300: | |
446 | if (s->crystal) | |
447 | baud = s->baud; | |
448 | else | |
449 | param_new = 15; | |
450 | break; | |
451 | case 600: | |
452 | param_new = 14 + s->crystal; | |
453 | break; | |
454 | case 1200: | |
455 | param_new = 13 + s->crystal; | |
456 | break; | |
457 | case 2400: | |
458 | param_new = 12 + s->crystal; | |
459 | break; | |
460 | case 4800: | |
461 | param_new = 11 + s->crystal; | |
462 | break; | |
463 | case 9600: | |
464 | param_new = 10 + s->crystal; | |
465 | break; | |
466 | case 19200: | |
467 | param_new = 9 + s->crystal; | |
468 | break; | |
469 | case 38400: | |
470 | param_new = 8 + s->crystal; | |
471 | break; | |
472 | case 57600: | |
473 | param_new = 1 + s->crystal; | |
474 | break; | |
475 | case 115200: | |
476 | param_new = 0 + s->crystal; | |
477 | break; | |
478 | case 230400: | |
479 | if (s->crystal) | |
480 | param_new = 0; | |
481 | else | |
482 | baud = s->baud; | |
483 | break; | |
484 | default: | |
485 | baud = s->baud; | |
486 | } | |
487 | tty_encode_baud_rate(tty, baud, baud); | |
488 | s->baud = baud; | |
489 | param_mask |= MAX3100_BAUD; | |
490 | ||
491 | if ((cflag & CSIZE) == CS8) { | |
492 | param_new &= ~MAX3100_L; | |
493 | parity &= ~MAX3100_7BIT; | |
494 | } else { | |
495 | param_new |= MAX3100_L; | |
496 | parity |= MAX3100_7BIT; | |
497 | cflag = (cflag & ~CSIZE) | CS7; | |
498 | } | |
499 | param_mask |= MAX3100_L; | |
500 | ||
501 | if (cflag & CSTOPB) | |
502 | param_new |= MAX3100_ST; | |
503 | else | |
504 | param_new &= ~MAX3100_ST; | |
505 | param_mask |= MAX3100_ST; | |
506 | ||
507 | if (cflag & PARENB) { | |
508 | param_new |= MAX3100_PE; | |
509 | parity |= MAX3100_PARITY_ON; | |
510 | } else { | |
511 | param_new &= ~MAX3100_PE; | |
512 | parity &= ~MAX3100_PARITY_ON; | |
513 | } | |
514 | param_mask |= MAX3100_PE; | |
515 | ||
516 | if (cflag & PARODD) | |
517 | parity |= MAX3100_PARITY_ODD; | |
518 | else | |
519 | parity &= ~MAX3100_PARITY_ODD; | |
520 | ||
521 | /* mask termios capabilities we don't support */ | |
522 | cflag &= ~CMSPAR; | |
523 | termios->c_cflag = cflag; | |
524 | ||
525 | s->port.ignore_status_mask = 0; | |
526 | if (termios->c_iflag & IGNPAR) | |
527 | s->port.ignore_status_mask |= | |
528 | MAX3100_STATUS_PE | MAX3100_STATUS_FE | | |
529 | MAX3100_STATUS_OE; | |
530 | ||
531 | /* we are sending char from a workqueue so enable */ | |
532 | s->port.info->port.tty->low_latency = 1; | |
533 | ||
534 | if (s->poll_time > 0) | |
535 | del_timer_sync(&s->timer); | |
536 | ||
537 | uart_update_timeout(port, termios->c_cflag, baud); | |
538 | ||
539 | spin_lock(&s->conf_lock); | |
540 | s->conf = (s->conf & ~param_mask) | (param_new & param_mask); | |
541 | s->conf_commit = 1; | |
542 | s->parity = parity; | |
543 | spin_unlock(&s->conf_lock); | |
544 | max3100_dowork(s); | |
545 | ||
546 | if (UART_ENABLE_MS(&s->port, termios->c_cflag)) | |
547 | max3100_enable_ms(&s->port); | |
548 | } | |
549 | ||
550 | static void max3100_shutdown(struct uart_port *port) | |
551 | { | |
552 | struct max3100_port *s = container_of(port, | |
553 | struct max3100_port, | |
554 | port); | |
555 | ||
556 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
557 | ||
558 | if (s->suspending) | |
559 | return; | |
560 | ||
561 | s->force_end_work = 1; | |
562 | ||
563 | if (s->poll_time > 0) | |
564 | del_timer_sync(&s->timer); | |
565 | ||
566 | if (s->workqueue) { | |
567 | flush_workqueue(s->workqueue); | |
568 | destroy_workqueue(s->workqueue); | |
569 | s->workqueue = NULL; | |
570 | } | |
571 | if (s->irq) | |
572 | free_irq(s->irq, s); | |
573 | ||
574 | /* set shutdown mode to save power */ | |
575 | if (s->max3100_hw_suspend) | |
576 | s->max3100_hw_suspend(1); | |
577 | else { | |
578 | u16 tx, rx; | |
579 | ||
580 | tx = MAX3100_WC | MAX3100_SHDN; | |
581 | max3100_sr(s, tx, &rx); | |
582 | } | |
583 | } | |
584 | ||
585 | static int max3100_startup(struct uart_port *port) | |
586 | { | |
587 | struct max3100_port *s = container_of(port, | |
588 | struct max3100_port, | |
589 | port); | |
590 | char b[12]; | |
591 | ||
592 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
593 | ||
594 | s->conf = MAX3100_RM; | |
595 | s->baud = s->crystal ? 230400 : 115200; | |
596 | s->rx_enabled = 1; | |
597 | ||
598 | if (s->suspending) | |
599 | return 0; | |
600 | ||
601 | s->force_end_work = 0; | |
602 | s->parity = 0; | |
603 | s->rts = 0; | |
604 | ||
605 | sprintf(b, "max3100-%d", s->minor); | |
606 | s->workqueue = create_freezeable_workqueue(b); | |
607 | if (!s->workqueue) { | |
608 | dev_warn(&s->spi->dev, "cannot create workqueue\n"); | |
609 | return -EBUSY; | |
610 | } | |
611 | INIT_WORK(&s->work, max3100_work); | |
612 | ||
613 | if (request_irq(s->irq, max3100_irq, | |
614 | IRQF_TRIGGER_FALLING, "max3100", s) < 0) { | |
615 | dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); | |
616 | s->irq = 0; | |
617 | destroy_workqueue(s->workqueue); | |
618 | s->workqueue = NULL; | |
619 | return -EBUSY; | |
620 | } | |
621 | ||
622 | if (s->loopback) { | |
623 | u16 tx, rx; | |
624 | tx = 0x4001; | |
625 | max3100_sr(s, tx, &rx); | |
626 | } | |
627 | ||
628 | if (s->max3100_hw_suspend) | |
629 | s->max3100_hw_suspend(0); | |
630 | s->conf_commit = 1; | |
631 | max3100_dowork(s); | |
632 | /* wait for clock to settle */ | |
633 | msleep(50); | |
634 | ||
635 | max3100_enable_ms(&s->port); | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | static const char *max3100_type(struct uart_port *port) | |
641 | { | |
642 | struct max3100_port *s = container_of(port, | |
643 | struct max3100_port, | |
644 | port); | |
645 | ||
646 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
647 | ||
648 | return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; | |
649 | } | |
650 | ||
651 | static void max3100_release_port(struct uart_port *port) | |
652 | { | |
653 | struct max3100_port *s = container_of(port, | |
654 | struct max3100_port, | |
655 | port); | |
656 | ||
657 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
658 | } | |
659 | ||
660 | static void max3100_config_port(struct uart_port *port, int flags) | |
661 | { | |
662 | struct max3100_port *s = container_of(port, | |
663 | struct max3100_port, | |
664 | port); | |
665 | ||
666 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
667 | ||
668 | if (flags & UART_CONFIG_TYPE) | |
669 | s->port.type = PORT_MAX3100; | |
670 | } | |
671 | ||
672 | static int max3100_verify_port(struct uart_port *port, | |
673 | struct serial_struct *ser) | |
674 | { | |
675 | struct max3100_port *s = container_of(port, | |
676 | struct max3100_port, | |
677 | port); | |
678 | int ret = -EINVAL; | |
679 | ||
680 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
681 | ||
682 | if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) | |
683 | ret = 0; | |
684 | return ret; | |
685 | } | |
686 | ||
687 | static void max3100_stop_tx(struct uart_port *port) | |
688 | { | |
689 | struct max3100_port *s = container_of(port, | |
690 | struct max3100_port, | |
691 | port); | |
692 | ||
693 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
694 | } | |
695 | ||
696 | static int max3100_request_port(struct uart_port *port) | |
697 | { | |
698 | struct max3100_port *s = container_of(port, | |
699 | struct max3100_port, | |
700 | port); | |
701 | ||
702 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
703 | return 0; | |
704 | } | |
705 | ||
706 | static void max3100_break_ctl(struct uart_port *port, int break_state) | |
707 | { | |
708 | struct max3100_port *s = container_of(port, | |
709 | struct max3100_port, | |
710 | port); | |
711 | ||
712 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
713 | } | |
714 | ||
715 | static struct uart_ops max3100_ops = { | |
716 | .tx_empty = max3100_tx_empty, | |
717 | .set_mctrl = max3100_set_mctrl, | |
718 | .get_mctrl = max3100_get_mctrl, | |
719 | .stop_tx = max3100_stop_tx, | |
720 | .start_tx = max3100_start_tx, | |
721 | .stop_rx = max3100_stop_rx, | |
722 | .enable_ms = max3100_enable_ms, | |
723 | .break_ctl = max3100_break_ctl, | |
724 | .startup = max3100_startup, | |
725 | .shutdown = max3100_shutdown, | |
726 | .set_termios = max3100_set_termios, | |
727 | .type = max3100_type, | |
728 | .release_port = max3100_release_port, | |
729 | .request_port = max3100_request_port, | |
730 | .config_port = max3100_config_port, | |
731 | .verify_port = max3100_verify_port, | |
732 | }; | |
733 | ||
734 | static struct uart_driver max3100_uart_driver = { | |
735 | .owner = THIS_MODULE, | |
736 | .driver_name = "ttyMAX", | |
737 | .dev_name = "ttyMAX", | |
738 | .major = MAX3100_MAJOR, | |
739 | .minor = MAX3100_MINOR, | |
740 | .nr = MAX_MAX3100, | |
741 | }; | |
742 | static int uart_driver_registered; | |
743 | ||
744 | static int __devinit max3100_probe(struct spi_device *spi) | |
745 | { | |
746 | int i, retval; | |
747 | struct plat_max3100 *pdata; | |
748 | u16 tx, rx; | |
749 | ||
750 | mutex_lock(&max3100s_lock); | |
751 | ||
752 | if (!uart_driver_registered) { | |
753 | uart_driver_registered = 1; | |
754 | retval = uart_register_driver(&max3100_uart_driver); | |
755 | if (retval) { | |
756 | printk(KERN_ERR "Couldn't register max3100 uart driver\n"); | |
757 | mutex_unlock(&max3100s_lock); | |
758 | return retval; | |
759 | } | |
760 | } | |
761 | ||
762 | for (i = 0; i < MAX_MAX3100; i++) | |
763 | if (!max3100s[i]) | |
764 | break; | |
765 | if (i == MAX_MAX3100) { | |
766 | dev_warn(&spi->dev, "too many MAX3100 chips\n"); | |
767 | mutex_unlock(&max3100s_lock); | |
768 | return -ENOMEM; | |
769 | } | |
770 | ||
771 | max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); | |
772 | if (!max3100s[i]) { | |
773 | dev_warn(&spi->dev, | |
774 | "kmalloc for max3100 structure %d failed!\n", i); | |
775 | mutex_unlock(&max3100s_lock); | |
776 | return -ENOMEM; | |
777 | } | |
778 | max3100s[i]->spi = spi; | |
779 | max3100s[i]->irq = spi->irq; | |
780 | spin_lock_init(&max3100s[i]->conf_lock); | |
781 | dev_set_drvdata(&spi->dev, max3100s[i]); | |
782 | pdata = spi->dev.platform_data; | |
783 | max3100s[i]->crystal = pdata->crystal; | |
784 | max3100s[i]->loopback = pdata->loopback; | |
785 | max3100s[i]->poll_time = pdata->poll_time * HZ / 1000; | |
786 | if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) | |
787 | max3100s[i]->poll_time = 1; | |
788 | max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; | |
789 | max3100s[i]->minor = i; | |
790 | init_timer(&max3100s[i]->timer); | |
791 | max3100s[i]->timer.function = max3100_timeout; | |
792 | max3100s[i]->timer.data = (unsigned long) max3100s[i]; | |
793 | ||
794 | dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); | |
795 | max3100s[i]->port.irq = max3100s[i]->irq; | |
796 | max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; | |
797 | max3100s[i]->port.fifosize = 16; | |
798 | max3100s[i]->port.ops = &max3100_ops; | |
799 | max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; | |
800 | max3100s[i]->port.line = i; | |
801 | max3100s[i]->port.type = PORT_MAX3100; | |
802 | max3100s[i]->port.dev = &spi->dev; | |
803 | retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); | |
804 | if (retval < 0) | |
805 | dev_warn(&spi->dev, | |
806 | "uart_add_one_port failed for line %d with error %d\n", | |
807 | i, retval); | |
808 | ||
809 | /* set shutdown mode to save power. Will be woken-up on open */ | |
810 | if (max3100s[i]->max3100_hw_suspend) | |
811 | max3100s[i]->max3100_hw_suspend(1); | |
812 | else { | |
813 | tx = MAX3100_WC | MAX3100_SHDN; | |
814 | max3100_sr(max3100s[i], tx, &rx); | |
815 | } | |
816 | mutex_unlock(&max3100s_lock); | |
817 | return 0; | |
818 | } | |
819 | ||
820 | static int __devexit max3100_remove(struct spi_device *spi) | |
821 | { | |
822 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
823 | int i; | |
824 | ||
825 | mutex_lock(&max3100s_lock); | |
826 | ||
827 | /* find out the index for the chip we are removing */ | |
828 | for (i = 0; i < MAX_MAX3100; i++) | |
829 | if (max3100s[i] == s) | |
830 | break; | |
831 | ||
832 | dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); | |
833 | uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); | |
834 | kfree(max3100s[i]); | |
835 | max3100s[i] = NULL; | |
836 | ||
837 | /* check if this is the last chip we have */ | |
838 | for (i = 0; i < MAX_MAX3100; i++) | |
839 | if (max3100s[i]) { | |
840 | mutex_unlock(&max3100s_lock); | |
841 | return 0; | |
842 | } | |
843 | pr_debug("removing max3100 driver\n"); | |
844 | uart_unregister_driver(&max3100_uart_driver); | |
845 | ||
846 | mutex_unlock(&max3100s_lock); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | #ifdef CONFIG_PM | |
851 | ||
852 | static int max3100_suspend(struct spi_device *spi, pm_message_t state) | |
853 | { | |
854 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
855 | ||
856 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
857 | ||
858 | disable_irq(s->irq); | |
859 | ||
860 | s->suspending = 1; | |
861 | uart_suspend_port(&max3100_uart_driver, &s->port); | |
862 | ||
863 | if (s->max3100_hw_suspend) | |
864 | s->max3100_hw_suspend(1); | |
865 | else { | |
866 | /* no HW suspend, so do SW one */ | |
867 | u16 tx, rx; | |
868 | ||
869 | tx = MAX3100_WC | MAX3100_SHDN; | |
870 | max3100_sr(s, tx, &rx); | |
871 | } | |
872 | return 0; | |
873 | } | |
874 | ||
875 | static int max3100_resume(struct spi_device *spi) | |
876 | { | |
877 | struct max3100_port *s = dev_get_drvdata(&spi->dev); | |
878 | ||
879 | dev_dbg(&s->spi->dev, "%s\n", __func__); | |
880 | ||
881 | if (s->max3100_hw_suspend) | |
882 | s->max3100_hw_suspend(0); | |
883 | uart_resume_port(&max3100_uart_driver, &s->port); | |
884 | s->suspending = 0; | |
885 | ||
886 | enable_irq(s->irq); | |
887 | ||
888 | s->conf_commit = 1; | |
889 | if (s->workqueue) | |
890 | max3100_dowork(s); | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
895 | #else | |
896 | #define max3100_suspend NULL | |
897 | #define max3100_resume NULL | |
898 | #endif | |
899 | ||
900 | static struct spi_driver max3100_driver = { | |
901 | .driver = { | |
902 | .name = "max3100", | |
903 | .bus = &spi_bus_type, | |
904 | .owner = THIS_MODULE, | |
905 | }, | |
906 | ||
907 | .probe = max3100_probe, | |
908 | .remove = __devexit_p(max3100_remove), | |
909 | .suspend = max3100_suspend, | |
910 | .resume = max3100_resume, | |
911 | }; | |
912 | ||
913 | static int __init max3100_init(void) | |
914 | { | |
915 | return spi_register_driver(&max3100_driver); | |
916 | } | |
917 | module_init(max3100_init); | |
918 | ||
919 | static void __exit max3100_exit(void) | |
920 | { | |
921 | spi_unregister_driver(&max3100_driver); | |
922 | } | |
923 | module_exit(max3100_exit); | |
924 | ||
925 | MODULE_DESCRIPTION("MAX3100 driver"); | |
926 | MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); | |
927 | MODULE_LICENSE("GPL"); |