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6e418a9d NP |
1 | /* |
2 | * linux/drivers/mmc/card/sdio_uart.c - SDIO UART/GPS driver | |
3 | * | |
4 | * Based on drivers/serial/8250.c and drivers/serial/serial_core.c | |
5 | * by Russell King. | |
6 | * | |
7 | * Author: Nicolas Pitre | |
8 | * Created: June 15, 2007 | |
9 | * Copyright: MontaVista Software, Inc. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or (at | |
14 | * your option) any later version. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Note: Although this driver assumes a 16550A-like UART implementation, | |
19 | * it is not possible to leverage the common 8250/16550 driver, nor the | |
20 | * core UART infrastructure, as they assumes direct access to the hardware | |
21 | * registers, often under a spinlock. This is not possible in the SDIO | |
22 | * context as SDIO access functions must be able to sleep. | |
23 | * | |
24 | * Because we need to lock the SDIO host to ensure an exclusive access to | |
25 | * the card, we simply rely on that lock to also prevent and serialize | |
26 | * concurrent access to the same port. | |
27 | */ | |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/mutex.h> | |
201a50ba | 33 | #include <linux/seq_file.h> |
6e418a9d NP |
34 | #include <linux/serial_reg.h> |
35 | #include <linux/circ_buf.h> | |
36 | #include <linux/gfp.h> | |
37 | #include <linux/tty.h> | |
38 | #include <linux/tty_flip.h> | |
39 | ||
40 | #include <linux/mmc/core.h> | |
41 | #include <linux/mmc/card.h> | |
42 | #include <linux/mmc/sdio_func.h> | |
43 | #include <linux/mmc/sdio_ids.h> | |
44 | ||
45 | ||
46 | #define UART_NR 8 /* Number of UARTs this driver can handle */ | |
47 | ||
48 | ||
49 | #define UART_XMIT_SIZE PAGE_SIZE | |
50 | #define WAKEUP_CHARS 256 | |
51 | ||
52 | #define circ_empty(circ) ((circ)->head == (circ)->tail) | |
53 | #define circ_clear(circ) ((circ)->head = (circ)->tail = 0) | |
54 | ||
55 | #define circ_chars_pending(circ) \ | |
56 | (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
57 | ||
58 | #define circ_chars_free(circ) \ | |
59 | (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE)) | |
60 | ||
61 | ||
62 | struct uart_icount { | |
63 | __u32 cts; | |
64 | __u32 dsr; | |
65 | __u32 rng; | |
66 | __u32 dcd; | |
67 | __u32 rx; | |
68 | __u32 tx; | |
69 | __u32 frame; | |
70 | __u32 overrun; | |
71 | __u32 parity; | |
72 | __u32 brk; | |
73 | }; | |
74 | ||
75 | struct sdio_uart_port { | |
b5849b1a | 76 | struct tty_port port; |
6e418a9d NP |
77 | struct kref kref; |
78 | struct tty_struct *tty; | |
79 | unsigned int index; | |
80 | unsigned int opened; | |
81 | struct mutex open_lock; | |
82 | struct sdio_func *func; | |
83 | struct mutex func_lock; | |
15b82b46 | 84 | struct task_struct *in_sdio_uart_irq; |
6e418a9d NP |
85 | unsigned int regs_offset; |
86 | struct circ_buf xmit; | |
87 | spinlock_t write_lock; | |
88 | struct uart_icount icount; | |
89 | unsigned int uartclk; | |
90 | unsigned int mctrl; | |
91 | unsigned int read_status_mask; | |
92 | unsigned int ignore_status_mask; | |
93 | unsigned char x_char; | |
94 | unsigned char ier; | |
95 | unsigned char lcr; | |
96 | }; | |
97 | ||
98 | static struct sdio_uart_port *sdio_uart_table[UART_NR]; | |
99 | static DEFINE_SPINLOCK(sdio_uart_table_lock); | |
100 | ||
101 | static int sdio_uart_add_port(struct sdio_uart_port *port) | |
102 | { | |
103 | int index, ret = -EBUSY; | |
104 | ||
105 | kref_init(&port->kref); | |
106 | mutex_init(&port->open_lock); | |
107 | mutex_init(&port->func_lock); | |
108 | spin_lock_init(&port->write_lock); | |
109 | ||
110 | spin_lock(&sdio_uart_table_lock); | |
111 | for (index = 0; index < UART_NR; index++) { | |
112 | if (!sdio_uart_table[index]) { | |
113 | port->index = index; | |
114 | sdio_uart_table[index] = port; | |
115 | ret = 0; | |
116 | break; | |
117 | } | |
118 | } | |
119 | spin_unlock(&sdio_uart_table_lock); | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | static struct sdio_uart_port *sdio_uart_port_get(unsigned index) | |
125 | { | |
126 | struct sdio_uart_port *port; | |
127 | ||
128 | if (index >= UART_NR) | |
129 | return NULL; | |
130 | ||
131 | spin_lock(&sdio_uart_table_lock); | |
132 | port = sdio_uart_table[index]; | |
133 | if (port) | |
134 | kref_get(&port->kref); | |
135 | spin_unlock(&sdio_uart_table_lock); | |
136 | ||
137 | return port; | |
138 | } | |
139 | ||
140 | static void sdio_uart_port_destroy(struct kref *kref) | |
141 | { | |
142 | struct sdio_uart_port *port = | |
143 | container_of(kref, struct sdio_uart_port, kref); | |
144 | kfree(port); | |
145 | } | |
146 | ||
147 | static void sdio_uart_port_put(struct sdio_uart_port *port) | |
148 | { | |
149 | kref_put(&port->kref, sdio_uart_port_destroy); | |
150 | } | |
151 | ||
152 | static void sdio_uart_port_remove(struct sdio_uart_port *port) | |
153 | { | |
154 | struct sdio_func *func; | |
155 | ||
156 | BUG_ON(sdio_uart_table[port->index] != port); | |
157 | ||
158 | spin_lock(&sdio_uart_table_lock); | |
159 | sdio_uart_table[port->index] = NULL; | |
160 | spin_unlock(&sdio_uart_table_lock); | |
161 | ||
162 | /* | |
163 | * We're killing a port that potentially still is in use by | |
164 | * the tty layer. Be careful to prevent any further access | |
165 | * to the SDIO function and arrange for the tty layer to | |
166 | * give up on that port ASAP. | |
167 | * Beware: the lock ordering is critical. | |
168 | */ | |
169 | mutex_lock(&port->open_lock); | |
170 | mutex_lock(&port->func_lock); | |
171 | func = port->func; | |
172 | sdio_claim_host(func); | |
173 | port->func = NULL; | |
174 | mutex_unlock(&port->func_lock); | |
530646f4 AC |
175 | if (port->opened) { |
176 | struct tty_struct *tty = tty_port_tty_get(&port->port); | |
177 | /* tty_hangup is async so is this safe as is ?? */ | |
178 | if (tty) | |
179 | tty_hangup(tty); | |
180 | tty_kref_put(tty); | |
181 | } | |
6e418a9d NP |
182 | mutex_unlock(&port->open_lock); |
183 | sdio_release_irq(func); | |
184 | sdio_disable_func(func); | |
185 | sdio_release_host(func); | |
186 | ||
187 | sdio_uart_port_put(port); | |
188 | } | |
189 | ||
190 | static int sdio_uart_claim_func(struct sdio_uart_port *port) | |
191 | { | |
192 | mutex_lock(&port->func_lock); | |
193 | if (unlikely(!port->func)) { | |
194 | mutex_unlock(&port->func_lock); | |
195 | return -ENODEV; | |
196 | } | |
15b82b46 NP |
197 | if (likely(port->in_sdio_uart_irq != current)) |
198 | sdio_claim_host(port->func); | |
6e418a9d NP |
199 | mutex_unlock(&port->func_lock); |
200 | return 0; | |
201 | } | |
202 | ||
203 | static inline void sdio_uart_release_func(struct sdio_uart_port *port) | |
204 | { | |
15b82b46 NP |
205 | if (likely(port->in_sdio_uart_irq != current)) |
206 | sdio_release_host(port->func); | |
6e418a9d NP |
207 | } |
208 | ||
209 | static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset) | |
210 | { | |
211 | unsigned char c; | |
212 | c = sdio_readb(port->func, port->regs_offset + offset, NULL); | |
213 | return c; | |
214 | } | |
215 | ||
216 | static inline void sdio_out(struct sdio_uart_port *port, int offset, int value) | |
217 | { | |
218 | sdio_writeb(port->func, value, port->regs_offset + offset, NULL); | |
219 | } | |
220 | ||
221 | static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) | |
222 | { | |
223 | unsigned char status; | |
224 | unsigned int ret; | |
225 | ||
226 | status = sdio_in(port, UART_MSR); | |
227 | ||
228 | ret = 0; | |
229 | if (status & UART_MSR_DCD) | |
230 | ret |= TIOCM_CAR; | |
231 | if (status & UART_MSR_RI) | |
232 | ret |= TIOCM_RNG; | |
233 | if (status & UART_MSR_DSR) | |
234 | ret |= TIOCM_DSR; | |
235 | if (status & UART_MSR_CTS) | |
236 | ret |= TIOCM_CTS; | |
237 | return ret; | |
238 | } | |
239 | ||
1e04b7ae TLSC |
240 | static void sdio_uart_write_mctrl(struct sdio_uart_port *port, |
241 | unsigned int mctrl) | |
6e418a9d NP |
242 | { |
243 | unsigned char mcr = 0; | |
244 | ||
245 | if (mctrl & TIOCM_RTS) | |
246 | mcr |= UART_MCR_RTS; | |
247 | if (mctrl & TIOCM_DTR) | |
248 | mcr |= UART_MCR_DTR; | |
249 | if (mctrl & TIOCM_OUT1) | |
250 | mcr |= UART_MCR_OUT1; | |
251 | if (mctrl & TIOCM_OUT2) | |
252 | mcr |= UART_MCR_OUT2; | |
253 | if (mctrl & TIOCM_LOOP) | |
254 | mcr |= UART_MCR_LOOP; | |
255 | ||
256 | sdio_out(port, UART_MCR, mcr); | |
257 | } | |
258 | ||
259 | static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port, | |
260 | unsigned int set, unsigned int clear) | |
261 | { | |
262 | unsigned int old; | |
263 | ||
264 | old = port->mctrl; | |
265 | port->mctrl = (old & ~clear) | set; | |
266 | if (old != port->mctrl) | |
267 | sdio_uart_write_mctrl(port, port->mctrl); | |
268 | } | |
269 | ||
270 | #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0) | |
271 | #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x) | |
272 | ||
273 | static void sdio_uart_change_speed(struct sdio_uart_port *port, | |
274 | struct ktermios *termios, | |
275 | struct ktermios *old) | |
276 | { | |
277 | unsigned char cval, fcr = 0; | |
278 | unsigned int baud, quot; | |
279 | ||
280 | switch (termios->c_cflag & CSIZE) { | |
281 | case CS5: | |
282 | cval = UART_LCR_WLEN5; | |
283 | break; | |
284 | case CS6: | |
285 | cval = UART_LCR_WLEN6; | |
286 | break; | |
287 | case CS7: | |
288 | cval = UART_LCR_WLEN7; | |
289 | break; | |
290 | default: | |
291 | case CS8: | |
292 | cval = UART_LCR_WLEN8; | |
293 | break; | |
294 | } | |
295 | ||
296 | if (termios->c_cflag & CSTOPB) | |
297 | cval |= UART_LCR_STOP; | |
298 | if (termios->c_cflag & PARENB) | |
299 | cval |= UART_LCR_PARITY; | |
300 | if (!(termios->c_cflag & PARODD)) | |
301 | cval |= UART_LCR_EPAR; | |
302 | ||
303 | for (;;) { | |
304 | baud = tty_termios_baud_rate(termios); | |
305 | if (baud == 0) | |
306 | baud = 9600; /* Special case: B0 rate. */ | |
307 | if (baud <= port->uartclk) | |
308 | break; | |
309 | /* | |
310 | * Oops, the quotient was zero. Try again with the old | |
311 | * baud rate if possible, otherwise default to 9600. | |
312 | */ | |
313 | termios->c_cflag &= ~CBAUD; | |
314 | if (old) { | |
315 | termios->c_cflag |= old->c_cflag & CBAUD; | |
316 | old = NULL; | |
317 | } else | |
318 | termios->c_cflag |= B9600; | |
319 | } | |
320 | quot = (2 * port->uartclk + baud) / (2 * baud); | |
321 | ||
322 | if (baud < 2400) | |
323 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
324 | else | |
325 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10; | |
326 | ||
327 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
328 | if (termios->c_iflag & INPCK) | |
329 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
330 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
331 | port->read_status_mask |= UART_LSR_BI; | |
332 | ||
333 | /* | |
334 | * Characters to ignore | |
335 | */ | |
336 | port->ignore_status_mask = 0; | |
337 | if (termios->c_iflag & IGNPAR) | |
338 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
339 | if (termios->c_iflag & IGNBRK) { | |
340 | port->ignore_status_mask |= UART_LSR_BI; | |
341 | /* | |
342 | * If we're ignoring parity and break indicators, | |
343 | * ignore overruns too (for real raw support). | |
344 | */ | |
345 | if (termios->c_iflag & IGNPAR) | |
346 | port->ignore_status_mask |= UART_LSR_OE; | |
347 | } | |
348 | ||
349 | /* | |
350 | * ignore all characters if CREAD is not set | |
351 | */ | |
352 | if ((termios->c_cflag & CREAD) == 0) | |
353 | port->ignore_status_mask |= UART_LSR_DR; | |
354 | ||
355 | /* | |
356 | * CTS flow control flag and modem status interrupts | |
357 | */ | |
358 | port->ier &= ~UART_IER_MSI; | |
359 | if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL)) | |
360 | port->ier |= UART_IER_MSI; | |
361 | ||
362 | port->lcr = cval; | |
363 | ||
364 | sdio_out(port, UART_IER, port->ier); | |
365 | sdio_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
366 | sdio_out(port, UART_DLL, quot & 0xff); | |
367 | sdio_out(port, UART_DLM, quot >> 8); | |
368 | sdio_out(port, UART_LCR, cval); | |
369 | sdio_out(port, UART_FCR, fcr); | |
370 | ||
371 | sdio_uart_write_mctrl(port, port->mctrl); | |
372 | } | |
373 | ||
374 | static void sdio_uart_start_tx(struct sdio_uart_port *port) | |
375 | { | |
376 | if (!(port->ier & UART_IER_THRI)) { | |
377 | port->ier |= UART_IER_THRI; | |
378 | sdio_out(port, UART_IER, port->ier); | |
379 | } | |
380 | } | |
381 | ||
382 | static void sdio_uart_stop_tx(struct sdio_uart_port *port) | |
383 | { | |
384 | if (port->ier & UART_IER_THRI) { | |
385 | port->ier &= ~UART_IER_THRI; | |
386 | sdio_out(port, UART_IER, port->ier); | |
387 | } | |
388 | } | |
389 | ||
390 | static void sdio_uart_stop_rx(struct sdio_uart_port *port) | |
391 | { | |
392 | port->ier &= ~UART_IER_RLSI; | |
393 | port->read_status_mask &= ~UART_LSR_DR; | |
394 | sdio_out(port, UART_IER, port->ier); | |
395 | } | |
396 | ||
1e04b7ae TLSC |
397 | static void sdio_uart_receive_chars(struct sdio_uart_port *port, |
398 | unsigned int *status) | |
6e418a9d | 399 | { |
530646f4 | 400 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
6e418a9d NP |
401 | unsigned int ch, flag; |
402 | int max_count = 256; | |
403 | ||
404 | do { | |
405 | ch = sdio_in(port, UART_RX); | |
406 | flag = TTY_NORMAL; | |
407 | port->icount.rx++; | |
408 | ||
409 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
1e04b7ae | 410 | UART_LSR_FE | UART_LSR_OE))) { |
6e418a9d NP |
411 | /* |
412 | * For statistics only | |
413 | */ | |
414 | if (*status & UART_LSR_BI) { | |
415 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
416 | port->icount.brk++; | |
417 | } else if (*status & UART_LSR_PE) | |
418 | port->icount.parity++; | |
419 | else if (*status & UART_LSR_FE) | |
420 | port->icount.frame++; | |
421 | if (*status & UART_LSR_OE) | |
422 | port->icount.overrun++; | |
423 | ||
424 | /* | |
425 | * Mask off conditions which should be ignored. | |
426 | */ | |
427 | *status &= port->read_status_mask; | |
1e04b7ae | 428 | if (*status & UART_LSR_BI) |
6e418a9d | 429 | flag = TTY_BREAK; |
1e04b7ae | 430 | else if (*status & UART_LSR_PE) |
6e418a9d NP |
431 | flag = TTY_PARITY; |
432 | else if (*status & UART_LSR_FE) | |
433 | flag = TTY_FRAME; | |
434 | } | |
435 | ||
436 | if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) | |
530646f4 AC |
437 | if (tty) |
438 | tty_insert_flip_char(tty, ch, flag); | |
6e418a9d NP |
439 | |
440 | /* | |
441 | * Overrun is special. Since it's reported immediately, | |
442 | * it doesn't affect the current character. | |
443 | */ | |
444 | if (*status & ~port->ignore_status_mask & UART_LSR_OE) | |
530646f4 AC |
445 | if (tty) |
446 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
6e418a9d NP |
447 | |
448 | *status = sdio_in(port, UART_LSR); | |
449 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
530646f4 AC |
450 | if (tty) { |
451 | tty_flip_buffer_push(tty); | |
452 | tty_kref_put(tty); | |
453 | } | |
6e418a9d NP |
454 | } |
455 | ||
456 | static void sdio_uart_transmit_chars(struct sdio_uart_port *port) | |
457 | { | |
458 | struct circ_buf *xmit = &port->xmit; | |
459 | int count; | |
530646f4 | 460 | struct tty_struct *tty; |
6e418a9d NP |
461 | |
462 | if (port->x_char) { | |
463 | sdio_out(port, UART_TX, port->x_char); | |
464 | port->icount.tx++; | |
465 | port->x_char = 0; | |
466 | return; | |
467 | } | |
530646f4 AC |
468 | |
469 | tty = tty_port_tty_get(&port->port); | |
470 | ||
471 | if (tty == NULL || circ_empty(xmit) || tty->stopped || tty->hw_stopped) { | |
6e418a9d | 472 | sdio_uart_stop_tx(port); |
530646f4 | 473 | tty_kref_put(tty); |
6e418a9d NP |
474 | return; |
475 | } | |
476 | ||
477 | count = 16; | |
478 | do { | |
479 | sdio_out(port, UART_TX, xmit->buf[xmit->tail]); | |
480 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
481 | port->icount.tx++; | |
482 | if (circ_empty(xmit)) | |
483 | break; | |
484 | } while (--count > 0); | |
485 | ||
486 | if (circ_chars_pending(xmit) < WAKEUP_CHARS) | |
b5849b1a | 487 | tty_wakeup(tty); |
6e418a9d NP |
488 | |
489 | if (circ_empty(xmit)) | |
490 | sdio_uart_stop_tx(port); | |
530646f4 | 491 | tty_kref_put(tty); |
6e418a9d NP |
492 | } |
493 | ||
494 | static void sdio_uart_check_modem_status(struct sdio_uart_port *port) | |
495 | { | |
496 | int status; | |
530646f4 | 497 | struct tty_struct *tty; |
6e418a9d NP |
498 | |
499 | status = sdio_in(port, UART_MSR); | |
500 | ||
501 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
502 | return; | |
503 | ||
504 | if (status & UART_MSR_TERI) | |
505 | port->icount.rng++; | |
506 | if (status & UART_MSR_DDSR) | |
507 | port->icount.dsr++; | |
508 | if (status & UART_MSR_DDCD) | |
509 | port->icount.dcd++; | |
510 | if (status & UART_MSR_DCTS) { | |
511 | port->icount.cts++; | |
530646f4 AC |
512 | tty = tty_port_tty_get(&port->port); |
513 | if (tty && (tty->termios->c_cflag & CRTSCTS)) { | |
6e418a9d | 514 | int cts = (status & UART_MSR_CTS); |
b5849b1a | 515 | if (tty->hw_stopped) { |
6e418a9d | 516 | if (cts) { |
b5849b1a | 517 | tty->hw_stopped = 0; |
6e418a9d | 518 | sdio_uart_start_tx(port); |
b5849b1a | 519 | tty_wakeup(tty); |
6e418a9d NP |
520 | } |
521 | } else { | |
522 | if (!cts) { | |
b5849b1a | 523 | tty->hw_stopped = 1; |
6e418a9d NP |
524 | sdio_uart_stop_tx(port); |
525 | } | |
526 | } | |
527 | } | |
530646f4 | 528 | tty_kref_put(tty); |
6e418a9d NP |
529 | } |
530 | } | |
531 | ||
532 | /* | |
533 | * This handles the interrupt from one port. | |
534 | */ | |
535 | static void sdio_uart_irq(struct sdio_func *func) | |
536 | { | |
537 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
538 | unsigned int iir, lsr; | |
539 | ||
15b82b46 NP |
540 | /* |
541 | * In a few places sdio_uart_irq() is called directly instead of | |
542 | * waiting for the actual interrupt to be raised and the SDIO IRQ | |
543 | * thread scheduled in order to reduce latency. However, some | |
544 | * interaction with the tty core may end up calling us back | |
545 | * (serial echo, flow control, etc.) through those same places | |
546 | * causing undesirable effects. Let's stop the recursion here. | |
547 | */ | |
548 | if (unlikely(port->in_sdio_uart_irq == current)) | |
549 | return; | |
550 | ||
6e418a9d NP |
551 | iir = sdio_in(port, UART_IIR); |
552 | if (iir & UART_IIR_NO_INT) | |
553 | return; | |
15b82b46 NP |
554 | |
555 | port->in_sdio_uart_irq = current; | |
6e418a9d NP |
556 | lsr = sdio_in(port, UART_LSR); |
557 | if (lsr & UART_LSR_DR) | |
558 | sdio_uart_receive_chars(port, &lsr); | |
559 | sdio_uart_check_modem_status(port); | |
560 | if (lsr & UART_LSR_THRE) | |
561 | sdio_uart_transmit_chars(port); | |
15b82b46 | 562 | port->in_sdio_uart_irq = NULL; |
6e418a9d NP |
563 | } |
564 | ||
565 | static int sdio_uart_startup(struct sdio_uart_port *port) | |
566 | { | |
567 | unsigned long page; | |
530646f4 AC |
568 | int ret = -ENOMEM; |
569 | struct tty_struct *tty = tty_port_tty_get(&port->port); | |
570 | ||
571 | /* FIXME: What if it is NULL ?? */ | |
6e418a9d NP |
572 | |
573 | /* | |
574 | * Set the TTY IO error marker - we will only clear this | |
575 | * once we have successfully opened the port. | |
576 | */ | |
b5849b1a | 577 | set_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d NP |
578 | |
579 | /* Initialise and allocate the transmit buffer. */ | |
580 | page = __get_free_page(GFP_KERNEL); | |
581 | if (!page) | |
530646f4 | 582 | goto err0; |
6e418a9d NP |
583 | port->xmit.buf = (unsigned char *)page; |
584 | circ_clear(&port->xmit); | |
585 | ||
586 | ret = sdio_uart_claim_func(port); | |
587 | if (ret) | |
588 | goto err1; | |
589 | ret = sdio_enable_func(port->func); | |
590 | if (ret) | |
591 | goto err2; | |
592 | ret = sdio_claim_irq(port->func, sdio_uart_irq); | |
593 | if (ret) | |
594 | goto err3; | |
595 | ||
596 | /* | |
597 | * Clear the FIFO buffers and disable them. | |
598 | * (they will be reenabled in sdio_change_speed()) | |
599 | */ | |
600 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
601 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
1e04b7ae | 602 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
6e418a9d NP |
603 | sdio_out(port, UART_FCR, 0); |
604 | ||
605 | /* | |
606 | * Clear the interrupt registers. | |
607 | */ | |
608 | (void) sdio_in(port, UART_LSR); | |
609 | (void) sdio_in(port, UART_RX); | |
610 | (void) sdio_in(port, UART_IIR); | |
611 | (void) sdio_in(port, UART_MSR); | |
612 | ||
613 | /* | |
614 | * Now, initialize the UART | |
615 | */ | |
616 | sdio_out(port, UART_LCR, UART_LCR_WLEN8); | |
617 | ||
618 | port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; | |
619 | port->mctrl = TIOCM_OUT2; | |
620 | ||
b5849b1a | 621 | sdio_uart_change_speed(port, tty->termios, NULL); |
6e418a9d | 622 | |
b5849b1a | 623 | if (tty->termios->c_cflag & CBAUD) |
6e418a9d NP |
624 | sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); |
625 | ||
b5849b1a | 626 | if (tty->termios->c_cflag & CRTSCTS) |
6e418a9d | 627 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) |
b5849b1a | 628 | tty->hw_stopped = 1; |
6e418a9d | 629 | |
0395b48c | 630 | clear_bit(TTY_IO_ERROR, &tty->flags); |
6e418a9d NP |
631 | |
632 | /* Kick the IRQ handler once while we're still holding the host lock */ | |
633 | sdio_uart_irq(port->func); | |
634 | ||
635 | sdio_uart_release_func(port); | |
530646f4 | 636 | tty_kref_put(tty); |
6e418a9d NP |
637 | return 0; |
638 | ||
639 | err3: | |
640 | sdio_disable_func(port->func); | |
641 | err2: | |
642 | sdio_uart_release_func(port); | |
643 | err1: | |
644 | free_page((unsigned long)port->xmit.buf); | |
530646f4 AC |
645 | err0: |
646 | tty_kref_put(tty); | |
6e418a9d NP |
647 | return ret; |
648 | } | |
649 | ||
650 | static void sdio_uart_shutdown(struct sdio_uart_port *port) | |
651 | { | |
652 | int ret; | |
530646f4 | 653 | struct tty_struct *tty; |
6e418a9d NP |
654 | |
655 | ret = sdio_uart_claim_func(port); | |
656 | if (ret) | |
657 | goto skip; | |
658 | ||
659 | sdio_uart_stop_rx(port); | |
660 | ||
661 | /* TODO: wait here for TX FIFO to drain */ | |
662 | ||
530646f4 | 663 | tty = tty_port_tty_get(&port->port); |
6e418a9d | 664 | /* Turn off DTR and RTS early. */ |
530646f4 | 665 | if (tty && (tty->termios->c_cflag & HUPCL)) |
6e418a9d | 666 | sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); |
530646f4 | 667 | tty_kref_put(tty); |
6e418a9d | 668 | |
1e04b7ae | 669 | /* Disable interrupts from this port */ |
6e418a9d NP |
670 | sdio_release_irq(port->func); |
671 | port->ier = 0; | |
672 | sdio_out(port, UART_IER, 0); | |
673 | ||
674 | sdio_uart_clear_mctrl(port, TIOCM_OUT2); | |
675 | ||
676 | /* Disable break condition and FIFOs. */ | |
677 | port->lcr &= ~UART_LCR_SBC; | |
678 | sdio_out(port, UART_LCR, port->lcr); | |
679 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
680 | UART_FCR_CLEAR_RCVR | | |
681 | UART_FCR_CLEAR_XMIT); | |
682 | sdio_out(port, UART_FCR, 0); | |
683 | ||
684 | sdio_disable_func(port->func); | |
685 | ||
686 | sdio_uart_release_func(port); | |
687 | ||
688 | skip: | |
689 | /* Free the transmit buffer page. */ | |
690 | free_page((unsigned long)port->xmit.buf); | |
691 | } | |
692 | ||
1e04b7ae | 693 | static int sdio_uart_open(struct tty_struct *tty, struct file *filp) |
6e418a9d NP |
694 | { |
695 | struct sdio_uart_port *port; | |
696 | int ret; | |
697 | ||
698 | port = sdio_uart_port_get(tty->index); | |
699 | if (!port) | |
700 | return -ENODEV; | |
701 | ||
702 | mutex_lock(&port->open_lock); | |
703 | ||
704 | /* | |
705 | * Make sure not to mess up with a dead port | |
706 | * which has not been closed yet. | |
707 | */ | |
708 | if (tty->driver_data && tty->driver_data != port) { | |
709 | mutex_unlock(&port->open_lock); | |
710 | sdio_uart_port_put(port); | |
711 | return -EBUSY; | |
712 | } | |
713 | ||
714 | if (!port->opened) { | |
715 | tty->driver_data = port; | |
530646f4 | 716 | tty_port_tty_set(&port->port, tty); |
6e418a9d NP |
717 | ret = sdio_uart_startup(port); |
718 | if (ret) { | |
719 | tty->driver_data = NULL; | |
530646f4 | 720 | tty_port_tty_set(&port->port, NULL); |
6e418a9d NP |
721 | mutex_unlock(&port->open_lock); |
722 | sdio_uart_port_put(port); | |
723 | return ret; | |
724 | } | |
725 | } | |
726 | port->opened++; | |
727 | mutex_unlock(&port->open_lock); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | static void sdio_uart_close(struct tty_struct *tty, struct file * filp) | |
732 | { | |
733 | struct sdio_uart_port *port = tty->driver_data; | |
734 | ||
735 | if (!port) | |
736 | return; | |
737 | ||
738 | mutex_lock(&port->open_lock); | |
739 | BUG_ON(!port->opened); | |
740 | ||
741 | /* | |
742 | * This is messy. The tty layer calls us even when open() | |
743 | * returned an error. Ignore this close request if tty->count | |
744 | * is larger than port->count. | |
745 | */ | |
746 | if (tty->count > port->opened) { | |
747 | mutex_unlock(&port->open_lock); | |
748 | return; | |
749 | } | |
750 | ||
751 | if (--port->opened == 0) { | |
752 | tty->closing = 1; | |
753 | sdio_uart_shutdown(port); | |
754 | tty_ldisc_flush(tty); | |
530646f4 | 755 | tty_port_tty_set(&port->port, NULL); |
6e418a9d NP |
756 | tty->driver_data = NULL; |
757 | tty->closing = 0; | |
758 | } | |
759 | mutex_unlock(&port->open_lock); | |
760 | sdio_uart_port_put(port); | |
761 | } | |
762 | ||
763 | static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf, | |
764 | int count) | |
765 | { | |
766 | struct sdio_uart_port *port = tty->driver_data; | |
767 | struct circ_buf *circ = &port->xmit; | |
768 | int c, ret = 0; | |
769 | ||
770 | if (!port->func) | |
771 | return -ENODEV; | |
772 | ||
773 | spin_lock(&port->write_lock); | |
774 | while (1) { | |
775 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
776 | if (count < c) | |
777 | c = count; | |
778 | if (c <= 0) | |
779 | break; | |
780 | memcpy(circ->buf + circ->head, buf, c); | |
781 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
782 | buf += c; | |
783 | count -= c; | |
784 | ret += c; | |
785 | } | |
786 | spin_unlock(&port->write_lock); | |
787 | ||
788 | if ( !(port->ier & UART_IER_THRI)) { | |
789 | int err = sdio_uart_claim_func(port); | |
790 | if (!err) { | |
791 | sdio_uart_start_tx(port); | |
792 | sdio_uart_irq(port->func); | |
793 | sdio_uart_release_func(port); | |
794 | } else | |
795 | ret = err; | |
796 | } | |
797 | ||
798 | return ret; | |
799 | } | |
800 | ||
801 | static int sdio_uart_write_room(struct tty_struct *tty) | |
802 | { | |
803 | struct sdio_uart_port *port = tty->driver_data; | |
804 | return port ? circ_chars_free(&port->xmit) : 0; | |
805 | } | |
806 | ||
807 | static int sdio_uart_chars_in_buffer(struct tty_struct *tty) | |
808 | { | |
809 | struct sdio_uart_port *port = tty->driver_data; | |
810 | return port ? circ_chars_pending(&port->xmit) : 0; | |
811 | } | |
812 | ||
813 | static void sdio_uart_send_xchar(struct tty_struct *tty, char ch) | |
814 | { | |
815 | struct sdio_uart_port *port = tty->driver_data; | |
816 | ||
817 | port->x_char = ch; | |
818 | if (ch && !(port->ier & UART_IER_THRI)) { | |
819 | if (sdio_uart_claim_func(port) != 0) | |
820 | return; | |
821 | sdio_uart_start_tx(port); | |
822 | sdio_uart_irq(port->func); | |
823 | sdio_uart_release_func(port); | |
824 | } | |
825 | } | |
826 | ||
827 | static void sdio_uart_throttle(struct tty_struct *tty) | |
828 | { | |
829 | struct sdio_uart_port *port = tty->driver_data; | |
830 | ||
831 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
832 | return; | |
833 | ||
834 | if (sdio_uart_claim_func(port) != 0) | |
835 | return; | |
836 | ||
837 | if (I_IXOFF(tty)) { | |
838 | port->x_char = STOP_CHAR(tty); | |
839 | sdio_uart_start_tx(port); | |
840 | } | |
841 | ||
842 | if (tty->termios->c_cflag & CRTSCTS) | |
843 | sdio_uart_clear_mctrl(port, TIOCM_RTS); | |
844 | ||
845 | sdio_uart_irq(port->func); | |
846 | sdio_uart_release_func(port); | |
847 | } | |
848 | ||
849 | static void sdio_uart_unthrottle(struct tty_struct *tty) | |
850 | { | |
851 | struct sdio_uart_port *port = tty->driver_data; | |
852 | ||
853 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
854 | return; | |
855 | ||
856 | if (sdio_uart_claim_func(port) != 0) | |
857 | return; | |
858 | ||
859 | if (I_IXOFF(tty)) { | |
860 | if (port->x_char) { | |
861 | port->x_char = 0; | |
862 | } else { | |
863 | port->x_char = START_CHAR(tty); | |
864 | sdio_uart_start_tx(port); | |
865 | } | |
866 | } | |
867 | ||
868 | if (tty->termios->c_cflag & CRTSCTS) | |
869 | sdio_uart_set_mctrl(port, TIOCM_RTS); | |
870 | ||
871 | sdio_uart_irq(port->func); | |
872 | sdio_uart_release_func(port); | |
873 | } | |
874 | ||
875 | static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios) | |
876 | { | |
877 | struct sdio_uart_port *port = tty->driver_data; | |
878 | unsigned int cflag = tty->termios->c_cflag; | |
879 | ||
1e04b7ae | 880 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
6e418a9d NP |
881 | |
882 | if ((cflag ^ old_termios->c_cflag) == 0 && | |
883 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) | |
884 | return; | |
885 | ||
886 | if (sdio_uart_claim_func(port) != 0) | |
887 | return; | |
888 | ||
889 | sdio_uart_change_speed(port, tty->termios, old_termios); | |
890 | ||
891 | /* Handle transition to B0 status */ | |
892 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
893 | sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
894 | ||
895 | /* Handle transition away from B0 status */ | |
896 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
897 | unsigned int mask = TIOCM_DTR; | |
898 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
899 | mask |= TIOCM_RTS; | |
900 | sdio_uart_set_mctrl(port, mask); | |
901 | } | |
902 | ||
903 | /* Handle turning off CRTSCTS */ | |
904 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
905 | tty->hw_stopped = 0; | |
906 | sdio_uart_start_tx(port); | |
907 | } | |
908 | ||
909 | /* Handle turning on CRTSCTS */ | |
910 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
911 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) { | |
912 | tty->hw_stopped = 1; | |
913 | sdio_uart_stop_tx(port); | |
914 | } | |
915 | } | |
916 | ||
917 | sdio_uart_release_func(port); | |
918 | } | |
919 | ||
c43d8636 | 920 | static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state) |
6e418a9d NP |
921 | { |
922 | struct sdio_uart_port *port = tty->driver_data; | |
c43d8636 | 923 | int result; |
6e418a9d | 924 | |
c43d8636 DH |
925 | result = sdio_uart_claim_func(port); |
926 | if (result != 0) | |
927 | return result; | |
6e418a9d NP |
928 | |
929 | if (break_state == -1) | |
930 | port->lcr |= UART_LCR_SBC; | |
931 | else | |
932 | port->lcr &= ~UART_LCR_SBC; | |
933 | sdio_out(port, UART_LCR, port->lcr); | |
934 | ||
935 | sdio_uart_release_func(port); | |
c43d8636 | 936 | return 0; |
6e418a9d NP |
937 | } |
938 | ||
939 | static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file) | |
940 | { | |
941 | struct sdio_uart_port *port = tty->driver_data; | |
942 | int result; | |
943 | ||
944 | result = sdio_uart_claim_func(port); | |
945 | if (!result) { | |
946 | result = port->mctrl | sdio_uart_get_mctrl(port); | |
947 | sdio_uart_release_func(port); | |
948 | } | |
949 | ||
950 | return result; | |
951 | } | |
952 | ||
953 | static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file, | |
954 | unsigned int set, unsigned int clear) | |
955 | { | |
956 | struct sdio_uart_port *port = tty->driver_data; | |
957 | int result; | |
958 | ||
1e04b7ae | 959 | result = sdio_uart_claim_func(port); |
6e418a9d NP |
960 | if(!result) { |
961 | sdio_uart_update_mctrl(port, set, clear); | |
962 | sdio_uart_release_func(port); | |
963 | } | |
964 | ||
965 | return result; | |
966 | } | |
967 | ||
201a50ba | 968 | static int sdio_uart_proc_show(struct seq_file *m, void *v) |
5ed334a1 | 969 | { |
201a50ba | 970 | int i; |
5ed334a1 | 971 | |
201a50ba | 972 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
5ed334a1 | 973 | "", "", ""); |
201a50ba | 974 | for (i = 0; i < UART_NR; i++) { |
5ed334a1 NP |
975 | struct sdio_uart_port *port = sdio_uart_port_get(i); |
976 | if (port) { | |
201a50ba | 977 | seq_printf(m, "%d: uart:SDIO", i); |
5ed334a1 | 978 | if(capable(CAP_SYS_ADMIN)) { |
201a50ba | 979 | seq_printf(m, " tx:%d rx:%d", |
1e04b7ae | 980 | port->icount.tx, port->icount.rx); |
5ed334a1 | 981 | if (port->icount.frame) |
201a50ba | 982 | seq_printf(m, " fe:%d", |
1e04b7ae | 983 | port->icount.frame); |
5ed334a1 | 984 | if (port->icount.parity) |
201a50ba | 985 | seq_printf(m, " pe:%d", |
1e04b7ae | 986 | port->icount.parity); |
5ed334a1 | 987 | if (port->icount.brk) |
201a50ba | 988 | seq_printf(m, " brk:%d", |
1e04b7ae | 989 | port->icount.brk); |
5ed334a1 | 990 | if (port->icount.overrun) |
201a50ba | 991 | seq_printf(m, " oe:%d", |
1e04b7ae | 992 | port->icount.overrun); |
5ed334a1 | 993 | if (port->icount.cts) |
201a50ba | 994 | seq_printf(m, " cts:%d", |
1e04b7ae | 995 | port->icount.cts); |
5ed334a1 | 996 | if (port->icount.dsr) |
201a50ba | 997 | seq_printf(m, " dsr:%d", |
1e04b7ae | 998 | port->icount.dsr); |
5ed334a1 | 999 | if (port->icount.rng) |
201a50ba | 1000 | seq_printf(m, " rng:%d", |
1e04b7ae | 1001 | port->icount.rng); |
5ed334a1 | 1002 | if (port->icount.dcd) |
201a50ba | 1003 | seq_printf(m, " dcd:%d", |
1e04b7ae | 1004 | port->icount.dcd); |
5ed334a1 | 1005 | } |
5ed334a1 | 1006 | sdio_uart_port_put(port); |
201a50ba | 1007 | seq_putc(m, '\n'); |
5ed334a1 NP |
1008 | } |
1009 | } | |
201a50ba AD |
1010 | return 0; |
1011 | } | |
5ed334a1 | 1012 | |
201a50ba AD |
1013 | static int sdio_uart_proc_open(struct inode *inode, struct file *file) |
1014 | { | |
1015 | return single_open(file, sdio_uart_proc_show, NULL); | |
5ed334a1 NP |
1016 | } |
1017 | ||
201a50ba AD |
1018 | static const struct file_operations sdio_uart_proc_fops = { |
1019 | .owner = THIS_MODULE, | |
1020 | .open = sdio_uart_proc_open, | |
1021 | .read = seq_read, | |
1022 | .llseek = seq_lseek, | |
1023 | .release = single_release, | |
1024 | }; | |
1025 | ||
6e418a9d NP |
1026 | static const struct tty_operations sdio_uart_ops = { |
1027 | .open = sdio_uart_open, | |
1028 | .close = sdio_uart_close, | |
1029 | .write = sdio_uart_write, | |
1030 | .write_room = sdio_uart_write_room, | |
1031 | .chars_in_buffer = sdio_uart_chars_in_buffer, | |
1032 | .send_xchar = sdio_uart_send_xchar, | |
1033 | .throttle = sdio_uart_throttle, | |
1034 | .unthrottle = sdio_uart_unthrottle, | |
1035 | .set_termios = sdio_uart_set_termios, | |
1036 | .break_ctl = sdio_uart_break_ctl, | |
1037 | .tiocmget = sdio_uart_tiocmget, | |
1038 | .tiocmset = sdio_uart_tiocmset, | |
201a50ba | 1039 | .proc_fops = &sdio_uart_proc_fops, |
6e418a9d NP |
1040 | }; |
1041 | ||
1042 | static struct tty_driver *sdio_uart_tty_driver; | |
1043 | ||
1044 | static int sdio_uart_probe(struct sdio_func *func, | |
1045 | const struct sdio_device_id *id) | |
1046 | { | |
1047 | struct sdio_uart_port *port; | |
1048 | int ret; | |
1049 | ||
1050 | port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL); | |
1051 | if (!port) | |
1052 | return -ENOMEM; | |
1053 | ||
1054 | if (func->class == SDIO_CLASS_UART) { | |
1055 | printk(KERN_WARNING "%s: need info on UART class basic setup\n", | |
1056 | sdio_func_id(func)); | |
1057 | kfree(port); | |
1058 | return -ENOSYS; | |
1059 | } else if (func->class == SDIO_CLASS_GPS) { | |
1060 | /* | |
1061 | * We need tuple 0x91. It contains SUBTPL_SIOREG | |
1062 | * and SUBTPL_RCVCAPS. | |
1063 | */ | |
1064 | struct sdio_func_tuple *tpl; | |
1065 | for (tpl = func->tuples; tpl; tpl = tpl->next) { | |
1066 | if (tpl->code != 0x91) | |
1067 | continue; | |
1068 | if (tpl->size < 10) | |
1069 | continue; | |
1070 | if (tpl->data[1] == 0) /* SUBTPL_SIOREG */ | |
1071 | break; | |
1072 | } | |
1073 | if (!tpl) { | |
1074 | printk(KERN_WARNING | |
1075 | "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", | |
1076 | sdio_func_id(func)); | |
1077 | kfree(port); | |
1078 | return -EINVAL; | |
1079 | } | |
1080 | printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n", | |
1081 | sdio_func_id(func), tpl->data[2], tpl->data[3]); | |
1082 | port->regs_offset = (tpl->data[4] << 0) | | |
1083 | (tpl->data[5] << 8) | | |
1084 | (tpl->data[6] << 16); | |
1085 | printk(KERN_DEBUG "%s: regs offset = 0x%x\n", | |
1086 | sdio_func_id(func), port->regs_offset); | |
1087 | port->uartclk = tpl->data[7] * 115200; | |
1088 | if (port->uartclk == 0) | |
1089 | port->uartclk = 115200; | |
1090 | printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n", | |
1091 | sdio_func_id(func), port->uartclk, | |
1092 | tpl->data[7], tpl->data[8] | (tpl->data[9] << 8)); | |
1093 | } else { | |
1094 | kfree(port); | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
1098 | port->func = func; | |
1099 | sdio_set_drvdata(func, port); | |
b5849b1a | 1100 | tty_port_init(&port->port); |
6e418a9d NP |
1101 | |
1102 | ret = sdio_uart_add_port(port); | |
1103 | if (ret) { | |
1104 | kfree(port); | |
1105 | } else { | |
1106 | struct device *dev; | |
1107 | dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev); | |
1108 | if (IS_ERR(dev)) { | |
1109 | sdio_uart_port_remove(port); | |
1110 | ret = PTR_ERR(dev); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | static void sdio_uart_remove(struct sdio_func *func) | |
1118 | { | |
1119 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
1120 | ||
1121 | tty_unregister_device(sdio_uart_tty_driver, port->index); | |
1122 | sdio_uart_port_remove(port); | |
1123 | } | |
1124 | ||
1125 | static const struct sdio_device_id sdio_uart_ids[] = { | |
1126 | { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) }, | |
1127 | { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) }, | |
1128 | { /* end: all zeroes */ }, | |
1129 | }; | |
1130 | ||
1131 | MODULE_DEVICE_TABLE(sdio, sdio_uart_ids); | |
1132 | ||
1133 | static struct sdio_driver sdio_uart_driver = { | |
1134 | .probe = sdio_uart_probe, | |
1135 | .remove = sdio_uart_remove, | |
1136 | .name = "sdio_uart", | |
1137 | .id_table = sdio_uart_ids, | |
1138 | }; | |
1139 | ||
1140 | static int __init sdio_uart_init(void) | |
1141 | { | |
1142 | int ret; | |
1143 | struct tty_driver *tty_drv; | |
1144 | ||
1145 | sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR); | |
1146 | if (!tty_drv) | |
1147 | return -ENOMEM; | |
1148 | ||
1149 | tty_drv->owner = THIS_MODULE; | |
1150 | tty_drv->driver_name = "sdio_uart"; | |
1151 | tty_drv->name = "ttySDIO"; | |
1152 | tty_drv->major = 0; /* dynamically allocated */ | |
1153 | tty_drv->minor_start = 0; | |
1154 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1155 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1156 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1157 | tty_drv->init_termios = tty_std_termios; | |
1158 | tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; | |
2ba30eed NP |
1159 | tty_drv->init_termios.c_ispeed = 4800; |
1160 | tty_drv->init_termios.c_ospeed = 4800; | |
6e418a9d NP |
1161 | tty_set_operations(tty_drv, &sdio_uart_ops); |
1162 | ||
1163 | ret = tty_register_driver(tty_drv); | |
1164 | if (ret) | |
1165 | goto err1; | |
1166 | ||
1167 | ret = sdio_register_driver(&sdio_uart_driver); | |
1168 | if (ret) | |
1169 | goto err2; | |
1170 | ||
1171 | return 0; | |
1172 | ||
1173 | err2: | |
1174 | tty_unregister_driver(tty_drv); | |
1175 | err1: | |
1176 | put_tty_driver(tty_drv); | |
1177 | return ret; | |
1178 | } | |
1179 | ||
1180 | static void __exit sdio_uart_exit(void) | |
1181 | { | |
1182 | sdio_unregister_driver(&sdio_uart_driver); | |
1183 | tty_unregister_driver(sdio_uart_tty_driver); | |
1184 | put_tty_driver(sdio_uart_tty_driver); | |
1185 | } | |
1186 | ||
1187 | module_init(sdio_uart_init); | |
1188 | module_exit(sdio_uart_exit); | |
1189 | ||
1190 | MODULE_AUTHOR("Nicolas Pitre"); | |
1191 | MODULE_LICENSE("GPL"); |