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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 { | |
76 | struct kref kref; | |
77 | struct tty_struct *tty; | |
78 | unsigned int index; | |
79 | unsigned int opened; | |
80 | struct mutex open_lock; | |
81 | struct sdio_func *func; | |
82 | struct mutex func_lock; | |
15b82b46 | 83 | struct task_struct *in_sdio_uart_irq; |
6e418a9d NP |
84 | unsigned int regs_offset; |
85 | struct circ_buf xmit; | |
86 | spinlock_t write_lock; | |
87 | struct uart_icount icount; | |
88 | unsigned int uartclk; | |
89 | unsigned int mctrl; | |
90 | unsigned int read_status_mask; | |
91 | unsigned int ignore_status_mask; | |
92 | unsigned char x_char; | |
93 | unsigned char ier; | |
94 | unsigned char lcr; | |
95 | }; | |
96 | ||
97 | static struct sdio_uart_port *sdio_uart_table[UART_NR]; | |
98 | static DEFINE_SPINLOCK(sdio_uart_table_lock); | |
99 | ||
100 | static int sdio_uart_add_port(struct sdio_uart_port *port) | |
101 | { | |
102 | int index, ret = -EBUSY; | |
103 | ||
104 | kref_init(&port->kref); | |
105 | mutex_init(&port->open_lock); | |
106 | mutex_init(&port->func_lock); | |
107 | spin_lock_init(&port->write_lock); | |
108 | ||
109 | spin_lock(&sdio_uart_table_lock); | |
110 | for (index = 0; index < UART_NR; index++) { | |
111 | if (!sdio_uart_table[index]) { | |
112 | port->index = index; | |
113 | sdio_uart_table[index] = port; | |
114 | ret = 0; | |
115 | break; | |
116 | } | |
117 | } | |
118 | spin_unlock(&sdio_uart_table_lock); | |
119 | ||
120 | return ret; | |
121 | } | |
122 | ||
123 | static struct sdio_uart_port *sdio_uart_port_get(unsigned index) | |
124 | { | |
125 | struct sdio_uart_port *port; | |
126 | ||
127 | if (index >= UART_NR) | |
128 | return NULL; | |
129 | ||
130 | spin_lock(&sdio_uart_table_lock); | |
131 | port = sdio_uart_table[index]; | |
132 | if (port) | |
133 | kref_get(&port->kref); | |
134 | spin_unlock(&sdio_uart_table_lock); | |
135 | ||
136 | return port; | |
137 | } | |
138 | ||
139 | static void sdio_uart_port_destroy(struct kref *kref) | |
140 | { | |
141 | struct sdio_uart_port *port = | |
142 | container_of(kref, struct sdio_uart_port, kref); | |
143 | kfree(port); | |
144 | } | |
145 | ||
146 | static void sdio_uart_port_put(struct sdio_uart_port *port) | |
147 | { | |
148 | kref_put(&port->kref, sdio_uart_port_destroy); | |
149 | } | |
150 | ||
151 | static void sdio_uart_port_remove(struct sdio_uart_port *port) | |
152 | { | |
153 | struct sdio_func *func; | |
154 | ||
155 | BUG_ON(sdio_uart_table[port->index] != port); | |
156 | ||
157 | spin_lock(&sdio_uart_table_lock); | |
158 | sdio_uart_table[port->index] = NULL; | |
159 | spin_unlock(&sdio_uart_table_lock); | |
160 | ||
161 | /* | |
162 | * We're killing a port that potentially still is in use by | |
163 | * the tty layer. Be careful to prevent any further access | |
164 | * to the SDIO function and arrange for the tty layer to | |
165 | * give up on that port ASAP. | |
166 | * Beware: the lock ordering is critical. | |
167 | */ | |
168 | mutex_lock(&port->open_lock); | |
169 | mutex_lock(&port->func_lock); | |
170 | func = port->func; | |
171 | sdio_claim_host(func); | |
172 | port->func = NULL; | |
173 | mutex_unlock(&port->func_lock); | |
174 | if (port->opened) | |
175 | tty_hangup(port->tty); | |
176 | mutex_unlock(&port->open_lock); | |
177 | sdio_release_irq(func); | |
178 | sdio_disable_func(func); | |
179 | sdio_release_host(func); | |
180 | ||
181 | sdio_uart_port_put(port); | |
182 | } | |
183 | ||
184 | static int sdio_uart_claim_func(struct sdio_uart_port *port) | |
185 | { | |
186 | mutex_lock(&port->func_lock); | |
187 | if (unlikely(!port->func)) { | |
188 | mutex_unlock(&port->func_lock); | |
189 | return -ENODEV; | |
190 | } | |
15b82b46 NP |
191 | if (likely(port->in_sdio_uart_irq != current)) |
192 | sdio_claim_host(port->func); | |
6e418a9d NP |
193 | mutex_unlock(&port->func_lock); |
194 | return 0; | |
195 | } | |
196 | ||
197 | static inline void sdio_uart_release_func(struct sdio_uart_port *port) | |
198 | { | |
15b82b46 NP |
199 | if (likely(port->in_sdio_uart_irq != current)) |
200 | sdio_release_host(port->func); | |
6e418a9d NP |
201 | } |
202 | ||
203 | static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset) | |
204 | { | |
205 | unsigned char c; | |
206 | c = sdio_readb(port->func, port->regs_offset + offset, NULL); | |
207 | return c; | |
208 | } | |
209 | ||
210 | static inline void sdio_out(struct sdio_uart_port *port, int offset, int value) | |
211 | { | |
212 | sdio_writeb(port->func, value, port->regs_offset + offset, NULL); | |
213 | } | |
214 | ||
215 | static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) | |
216 | { | |
217 | unsigned char status; | |
218 | unsigned int ret; | |
219 | ||
220 | status = sdio_in(port, UART_MSR); | |
221 | ||
222 | ret = 0; | |
223 | if (status & UART_MSR_DCD) | |
224 | ret |= TIOCM_CAR; | |
225 | if (status & UART_MSR_RI) | |
226 | ret |= TIOCM_RNG; | |
227 | if (status & UART_MSR_DSR) | |
228 | ret |= TIOCM_DSR; | |
229 | if (status & UART_MSR_CTS) | |
230 | ret |= TIOCM_CTS; | |
231 | return ret; | |
232 | } | |
233 | ||
234 | static void sdio_uart_write_mctrl(struct sdio_uart_port *port, unsigned int mctrl) | |
235 | { | |
236 | unsigned char mcr = 0; | |
237 | ||
238 | if (mctrl & TIOCM_RTS) | |
239 | mcr |= UART_MCR_RTS; | |
240 | if (mctrl & TIOCM_DTR) | |
241 | mcr |= UART_MCR_DTR; | |
242 | if (mctrl & TIOCM_OUT1) | |
243 | mcr |= UART_MCR_OUT1; | |
244 | if (mctrl & TIOCM_OUT2) | |
245 | mcr |= UART_MCR_OUT2; | |
246 | if (mctrl & TIOCM_LOOP) | |
247 | mcr |= UART_MCR_LOOP; | |
248 | ||
249 | sdio_out(port, UART_MCR, mcr); | |
250 | } | |
251 | ||
252 | static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port, | |
253 | unsigned int set, unsigned int clear) | |
254 | { | |
255 | unsigned int old; | |
256 | ||
257 | old = port->mctrl; | |
258 | port->mctrl = (old & ~clear) | set; | |
259 | if (old != port->mctrl) | |
260 | sdio_uart_write_mctrl(port, port->mctrl); | |
261 | } | |
262 | ||
263 | #define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0) | |
264 | #define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x) | |
265 | ||
266 | static void sdio_uart_change_speed(struct sdio_uart_port *port, | |
267 | struct ktermios *termios, | |
268 | struct ktermios *old) | |
269 | { | |
270 | unsigned char cval, fcr = 0; | |
271 | unsigned int baud, quot; | |
272 | ||
273 | switch (termios->c_cflag & CSIZE) { | |
274 | case CS5: | |
275 | cval = UART_LCR_WLEN5; | |
276 | break; | |
277 | case CS6: | |
278 | cval = UART_LCR_WLEN6; | |
279 | break; | |
280 | case CS7: | |
281 | cval = UART_LCR_WLEN7; | |
282 | break; | |
283 | default: | |
284 | case CS8: | |
285 | cval = UART_LCR_WLEN8; | |
286 | break; | |
287 | } | |
288 | ||
289 | if (termios->c_cflag & CSTOPB) | |
290 | cval |= UART_LCR_STOP; | |
291 | if (termios->c_cflag & PARENB) | |
292 | cval |= UART_LCR_PARITY; | |
293 | if (!(termios->c_cflag & PARODD)) | |
294 | cval |= UART_LCR_EPAR; | |
295 | ||
296 | for (;;) { | |
297 | baud = tty_termios_baud_rate(termios); | |
298 | if (baud == 0) | |
299 | baud = 9600; /* Special case: B0 rate. */ | |
300 | if (baud <= port->uartclk) | |
301 | break; | |
302 | /* | |
303 | * Oops, the quotient was zero. Try again with the old | |
304 | * baud rate if possible, otherwise default to 9600. | |
305 | */ | |
306 | termios->c_cflag &= ~CBAUD; | |
307 | if (old) { | |
308 | termios->c_cflag |= old->c_cflag & CBAUD; | |
309 | old = NULL; | |
310 | } else | |
311 | termios->c_cflag |= B9600; | |
312 | } | |
313 | quot = (2 * port->uartclk + baud) / (2 * baud); | |
314 | ||
315 | if (baud < 2400) | |
316 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1; | |
317 | else | |
318 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10; | |
319 | ||
320 | port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; | |
321 | if (termios->c_iflag & INPCK) | |
322 | port->read_status_mask |= UART_LSR_FE | UART_LSR_PE; | |
323 | if (termios->c_iflag & (BRKINT | PARMRK)) | |
324 | port->read_status_mask |= UART_LSR_BI; | |
325 | ||
326 | /* | |
327 | * Characters to ignore | |
328 | */ | |
329 | port->ignore_status_mask = 0; | |
330 | if (termios->c_iflag & IGNPAR) | |
331 | port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; | |
332 | if (termios->c_iflag & IGNBRK) { | |
333 | port->ignore_status_mask |= UART_LSR_BI; | |
334 | /* | |
335 | * If we're ignoring parity and break indicators, | |
336 | * ignore overruns too (for real raw support). | |
337 | */ | |
338 | if (termios->c_iflag & IGNPAR) | |
339 | port->ignore_status_mask |= UART_LSR_OE; | |
340 | } | |
341 | ||
342 | /* | |
343 | * ignore all characters if CREAD is not set | |
344 | */ | |
345 | if ((termios->c_cflag & CREAD) == 0) | |
346 | port->ignore_status_mask |= UART_LSR_DR; | |
347 | ||
348 | /* | |
349 | * CTS flow control flag and modem status interrupts | |
350 | */ | |
351 | port->ier &= ~UART_IER_MSI; | |
352 | if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL)) | |
353 | port->ier |= UART_IER_MSI; | |
354 | ||
355 | port->lcr = cval; | |
356 | ||
357 | sdio_out(port, UART_IER, port->ier); | |
358 | sdio_out(port, UART_LCR, cval | UART_LCR_DLAB); | |
359 | sdio_out(port, UART_DLL, quot & 0xff); | |
360 | sdio_out(port, UART_DLM, quot >> 8); | |
361 | sdio_out(port, UART_LCR, cval); | |
362 | sdio_out(port, UART_FCR, fcr); | |
363 | ||
364 | sdio_uart_write_mctrl(port, port->mctrl); | |
365 | } | |
366 | ||
367 | static void sdio_uart_start_tx(struct sdio_uart_port *port) | |
368 | { | |
369 | if (!(port->ier & UART_IER_THRI)) { | |
370 | port->ier |= UART_IER_THRI; | |
371 | sdio_out(port, UART_IER, port->ier); | |
372 | } | |
373 | } | |
374 | ||
375 | static void sdio_uart_stop_tx(struct sdio_uart_port *port) | |
376 | { | |
377 | if (port->ier & UART_IER_THRI) { | |
378 | port->ier &= ~UART_IER_THRI; | |
379 | sdio_out(port, UART_IER, port->ier); | |
380 | } | |
381 | } | |
382 | ||
383 | static void sdio_uart_stop_rx(struct sdio_uart_port *port) | |
384 | { | |
385 | port->ier &= ~UART_IER_RLSI; | |
386 | port->read_status_mask &= ~UART_LSR_DR; | |
387 | sdio_out(port, UART_IER, port->ier); | |
388 | } | |
389 | ||
a960d5dc | 390 | static void sdio_uart_receive_chars(struct sdio_uart_port *port, unsigned int *status) |
6e418a9d NP |
391 | { |
392 | struct tty_struct *tty = port->tty; | |
393 | unsigned int ch, flag; | |
394 | int max_count = 256; | |
395 | ||
396 | do { | |
397 | ch = sdio_in(port, UART_RX); | |
398 | flag = TTY_NORMAL; | |
399 | port->icount.rx++; | |
400 | ||
401 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | | |
402 | UART_LSR_FE | UART_LSR_OE))) { | |
403 | /* | |
404 | * For statistics only | |
405 | */ | |
406 | if (*status & UART_LSR_BI) { | |
407 | *status &= ~(UART_LSR_FE | UART_LSR_PE); | |
408 | port->icount.brk++; | |
409 | } else if (*status & UART_LSR_PE) | |
410 | port->icount.parity++; | |
411 | else if (*status & UART_LSR_FE) | |
412 | port->icount.frame++; | |
413 | if (*status & UART_LSR_OE) | |
414 | port->icount.overrun++; | |
415 | ||
416 | /* | |
417 | * Mask off conditions which should be ignored. | |
418 | */ | |
419 | *status &= port->read_status_mask; | |
420 | if (*status & UART_LSR_BI) { | |
421 | flag = TTY_BREAK; | |
422 | } else if (*status & UART_LSR_PE) | |
423 | flag = TTY_PARITY; | |
424 | else if (*status & UART_LSR_FE) | |
425 | flag = TTY_FRAME; | |
426 | } | |
427 | ||
428 | if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) | |
429 | tty_insert_flip_char(tty, ch, flag); | |
430 | ||
431 | /* | |
432 | * Overrun is special. Since it's reported immediately, | |
433 | * it doesn't affect the current character. | |
434 | */ | |
435 | if (*status & ~port->ignore_status_mask & UART_LSR_OE) | |
436 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); | |
437 | ||
438 | *status = sdio_in(port, UART_LSR); | |
439 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); | |
440 | tty_flip_buffer_push(tty); | |
441 | } | |
442 | ||
443 | static void sdio_uart_transmit_chars(struct sdio_uart_port *port) | |
444 | { | |
445 | struct circ_buf *xmit = &port->xmit; | |
446 | int count; | |
447 | ||
448 | if (port->x_char) { | |
449 | sdio_out(port, UART_TX, port->x_char); | |
450 | port->icount.tx++; | |
451 | port->x_char = 0; | |
452 | return; | |
453 | } | |
454 | if (circ_empty(xmit) || port->tty->stopped || port->tty->hw_stopped) { | |
455 | sdio_uart_stop_tx(port); | |
456 | return; | |
457 | } | |
458 | ||
459 | count = 16; | |
460 | do { | |
461 | sdio_out(port, UART_TX, xmit->buf[xmit->tail]); | |
462 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); | |
463 | port->icount.tx++; | |
464 | if (circ_empty(xmit)) | |
465 | break; | |
466 | } while (--count > 0); | |
467 | ||
468 | if (circ_chars_pending(xmit) < WAKEUP_CHARS) | |
469 | tty_wakeup(port->tty); | |
470 | ||
471 | if (circ_empty(xmit)) | |
472 | sdio_uart_stop_tx(port); | |
473 | } | |
474 | ||
475 | static void sdio_uart_check_modem_status(struct sdio_uart_port *port) | |
476 | { | |
477 | int status; | |
478 | ||
479 | status = sdio_in(port, UART_MSR); | |
480 | ||
481 | if ((status & UART_MSR_ANY_DELTA) == 0) | |
482 | return; | |
483 | ||
484 | if (status & UART_MSR_TERI) | |
485 | port->icount.rng++; | |
486 | if (status & UART_MSR_DDSR) | |
487 | port->icount.dsr++; | |
488 | if (status & UART_MSR_DDCD) | |
489 | port->icount.dcd++; | |
490 | if (status & UART_MSR_DCTS) { | |
491 | port->icount.cts++; | |
492 | if (port->tty->termios->c_cflag & CRTSCTS) { | |
493 | int cts = (status & UART_MSR_CTS); | |
494 | if (port->tty->hw_stopped) { | |
495 | if (cts) { | |
496 | port->tty->hw_stopped = 0; | |
497 | sdio_uart_start_tx(port); | |
498 | tty_wakeup(port->tty); | |
499 | } | |
500 | } else { | |
501 | if (!cts) { | |
502 | port->tty->hw_stopped = 1; | |
503 | sdio_uart_stop_tx(port); | |
504 | } | |
505 | } | |
506 | } | |
507 | } | |
508 | } | |
509 | ||
510 | /* | |
511 | * This handles the interrupt from one port. | |
512 | */ | |
513 | static void sdio_uart_irq(struct sdio_func *func) | |
514 | { | |
515 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
516 | unsigned int iir, lsr; | |
517 | ||
15b82b46 NP |
518 | /* |
519 | * In a few places sdio_uart_irq() is called directly instead of | |
520 | * waiting for the actual interrupt to be raised and the SDIO IRQ | |
521 | * thread scheduled in order to reduce latency. However, some | |
522 | * interaction with the tty core may end up calling us back | |
523 | * (serial echo, flow control, etc.) through those same places | |
524 | * causing undesirable effects. Let's stop the recursion here. | |
525 | */ | |
526 | if (unlikely(port->in_sdio_uart_irq == current)) | |
527 | return; | |
528 | ||
6e418a9d NP |
529 | iir = sdio_in(port, UART_IIR); |
530 | if (iir & UART_IIR_NO_INT) | |
531 | return; | |
15b82b46 NP |
532 | |
533 | port->in_sdio_uart_irq = current; | |
6e418a9d NP |
534 | lsr = sdio_in(port, UART_LSR); |
535 | if (lsr & UART_LSR_DR) | |
536 | sdio_uart_receive_chars(port, &lsr); | |
537 | sdio_uart_check_modem_status(port); | |
538 | if (lsr & UART_LSR_THRE) | |
539 | sdio_uart_transmit_chars(port); | |
15b82b46 | 540 | port->in_sdio_uart_irq = NULL; |
6e418a9d NP |
541 | } |
542 | ||
543 | static int sdio_uart_startup(struct sdio_uart_port *port) | |
544 | { | |
545 | unsigned long page; | |
546 | int ret; | |
547 | ||
548 | /* | |
549 | * Set the TTY IO error marker - we will only clear this | |
550 | * once we have successfully opened the port. | |
551 | */ | |
552 | set_bit(TTY_IO_ERROR, &port->tty->flags); | |
553 | ||
554 | /* Initialise and allocate the transmit buffer. */ | |
555 | page = __get_free_page(GFP_KERNEL); | |
556 | if (!page) | |
557 | return -ENOMEM; | |
558 | port->xmit.buf = (unsigned char *)page; | |
559 | circ_clear(&port->xmit); | |
560 | ||
561 | ret = sdio_uart_claim_func(port); | |
562 | if (ret) | |
563 | goto err1; | |
564 | ret = sdio_enable_func(port->func); | |
565 | if (ret) | |
566 | goto err2; | |
567 | ret = sdio_claim_irq(port->func, sdio_uart_irq); | |
568 | if (ret) | |
569 | goto err3; | |
570 | ||
571 | /* | |
572 | * Clear the FIFO buffers and disable them. | |
573 | * (they will be reenabled in sdio_change_speed()) | |
574 | */ | |
575 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO); | |
576 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
577 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); | |
578 | sdio_out(port, UART_FCR, 0); | |
579 | ||
580 | /* | |
581 | * Clear the interrupt registers. | |
582 | */ | |
583 | (void) sdio_in(port, UART_LSR); | |
584 | (void) sdio_in(port, UART_RX); | |
585 | (void) sdio_in(port, UART_IIR); | |
586 | (void) sdio_in(port, UART_MSR); | |
587 | ||
588 | /* | |
589 | * Now, initialize the UART | |
590 | */ | |
591 | sdio_out(port, UART_LCR, UART_LCR_WLEN8); | |
592 | ||
593 | port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; | |
594 | port->mctrl = TIOCM_OUT2; | |
595 | ||
596 | sdio_uart_change_speed(port, port->tty->termios, NULL); | |
597 | ||
598 | if (port->tty->termios->c_cflag & CBAUD) | |
599 | sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
600 | ||
601 | if (port->tty->termios->c_cflag & CRTSCTS) | |
602 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) | |
603 | port->tty->hw_stopped = 1; | |
604 | ||
605 | clear_bit(TTY_IO_ERROR, &port->tty->flags); | |
606 | ||
607 | /* Kick the IRQ handler once while we're still holding the host lock */ | |
608 | sdio_uart_irq(port->func); | |
609 | ||
610 | sdio_uart_release_func(port); | |
611 | return 0; | |
612 | ||
613 | err3: | |
614 | sdio_disable_func(port->func); | |
615 | err2: | |
616 | sdio_uart_release_func(port); | |
617 | err1: | |
618 | free_page((unsigned long)port->xmit.buf); | |
619 | return ret; | |
620 | } | |
621 | ||
622 | static void sdio_uart_shutdown(struct sdio_uart_port *port) | |
623 | { | |
624 | int ret; | |
625 | ||
626 | ret = sdio_uart_claim_func(port); | |
627 | if (ret) | |
628 | goto skip; | |
629 | ||
630 | sdio_uart_stop_rx(port); | |
631 | ||
632 | /* TODO: wait here for TX FIFO to drain */ | |
633 | ||
634 | /* Turn off DTR and RTS early. */ | |
635 | if (port->tty->termios->c_cflag & HUPCL) | |
636 | sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); | |
637 | ||
638 | /* Disable interrupts from this port */ | |
639 | sdio_release_irq(port->func); | |
640 | port->ier = 0; | |
641 | sdio_out(port, UART_IER, 0); | |
642 | ||
643 | sdio_uart_clear_mctrl(port, TIOCM_OUT2); | |
644 | ||
645 | /* Disable break condition and FIFOs. */ | |
646 | port->lcr &= ~UART_LCR_SBC; | |
647 | sdio_out(port, UART_LCR, port->lcr); | |
648 | sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO | | |
649 | UART_FCR_CLEAR_RCVR | | |
650 | UART_FCR_CLEAR_XMIT); | |
651 | sdio_out(port, UART_FCR, 0); | |
652 | ||
653 | sdio_disable_func(port->func); | |
654 | ||
655 | sdio_uart_release_func(port); | |
656 | ||
657 | skip: | |
658 | /* Free the transmit buffer page. */ | |
659 | free_page((unsigned long)port->xmit.buf); | |
660 | } | |
661 | ||
662 | static int sdio_uart_open (struct tty_struct *tty, struct file * filp) | |
663 | { | |
664 | struct sdio_uart_port *port; | |
665 | int ret; | |
666 | ||
667 | port = sdio_uart_port_get(tty->index); | |
668 | if (!port) | |
669 | return -ENODEV; | |
670 | ||
671 | mutex_lock(&port->open_lock); | |
672 | ||
673 | /* | |
674 | * Make sure not to mess up with a dead port | |
675 | * which has not been closed yet. | |
676 | */ | |
677 | if (tty->driver_data && tty->driver_data != port) { | |
678 | mutex_unlock(&port->open_lock); | |
679 | sdio_uart_port_put(port); | |
680 | return -EBUSY; | |
681 | } | |
682 | ||
683 | if (!port->opened) { | |
684 | tty->driver_data = port; | |
685 | port->tty = tty; | |
686 | ret = sdio_uart_startup(port); | |
687 | if (ret) { | |
688 | tty->driver_data = NULL; | |
689 | port->tty = NULL; | |
690 | mutex_unlock(&port->open_lock); | |
691 | sdio_uart_port_put(port); | |
692 | return ret; | |
693 | } | |
694 | } | |
695 | port->opened++; | |
696 | mutex_unlock(&port->open_lock); | |
697 | return 0; | |
698 | } | |
699 | ||
700 | static void sdio_uart_close(struct tty_struct *tty, struct file * filp) | |
701 | { | |
702 | struct sdio_uart_port *port = tty->driver_data; | |
703 | ||
704 | if (!port) | |
705 | return; | |
706 | ||
707 | mutex_lock(&port->open_lock); | |
708 | BUG_ON(!port->opened); | |
709 | ||
710 | /* | |
711 | * This is messy. The tty layer calls us even when open() | |
712 | * returned an error. Ignore this close request if tty->count | |
713 | * is larger than port->count. | |
714 | */ | |
715 | if (tty->count > port->opened) { | |
716 | mutex_unlock(&port->open_lock); | |
717 | return; | |
718 | } | |
719 | ||
720 | if (--port->opened == 0) { | |
721 | tty->closing = 1; | |
722 | sdio_uart_shutdown(port); | |
723 | tty_ldisc_flush(tty); | |
724 | port->tty = NULL; | |
725 | tty->driver_data = NULL; | |
726 | tty->closing = 0; | |
727 | } | |
728 | mutex_unlock(&port->open_lock); | |
729 | sdio_uart_port_put(port); | |
730 | } | |
731 | ||
732 | static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf, | |
733 | int count) | |
734 | { | |
735 | struct sdio_uart_port *port = tty->driver_data; | |
736 | struct circ_buf *circ = &port->xmit; | |
737 | int c, ret = 0; | |
738 | ||
739 | if (!port->func) | |
740 | return -ENODEV; | |
741 | ||
742 | spin_lock(&port->write_lock); | |
743 | while (1) { | |
744 | c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE); | |
745 | if (count < c) | |
746 | c = count; | |
747 | if (c <= 0) | |
748 | break; | |
749 | memcpy(circ->buf + circ->head, buf, c); | |
750 | circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1); | |
751 | buf += c; | |
752 | count -= c; | |
753 | ret += c; | |
754 | } | |
755 | spin_unlock(&port->write_lock); | |
756 | ||
757 | if ( !(port->ier & UART_IER_THRI)) { | |
758 | int err = sdio_uart_claim_func(port); | |
759 | if (!err) { | |
760 | sdio_uart_start_tx(port); | |
761 | sdio_uart_irq(port->func); | |
762 | sdio_uart_release_func(port); | |
763 | } else | |
764 | ret = err; | |
765 | } | |
766 | ||
767 | return ret; | |
768 | } | |
769 | ||
770 | static int sdio_uart_write_room(struct tty_struct *tty) | |
771 | { | |
772 | struct sdio_uart_port *port = tty->driver_data; | |
773 | return port ? circ_chars_free(&port->xmit) : 0; | |
774 | } | |
775 | ||
776 | static int sdio_uart_chars_in_buffer(struct tty_struct *tty) | |
777 | { | |
778 | struct sdio_uart_port *port = tty->driver_data; | |
779 | return port ? circ_chars_pending(&port->xmit) : 0; | |
780 | } | |
781 | ||
782 | static void sdio_uart_send_xchar(struct tty_struct *tty, char ch) | |
783 | { | |
784 | struct sdio_uart_port *port = tty->driver_data; | |
785 | ||
786 | port->x_char = ch; | |
787 | if (ch && !(port->ier & UART_IER_THRI)) { | |
788 | if (sdio_uart_claim_func(port) != 0) | |
789 | return; | |
790 | sdio_uart_start_tx(port); | |
791 | sdio_uart_irq(port->func); | |
792 | sdio_uart_release_func(port); | |
793 | } | |
794 | } | |
795 | ||
796 | static void sdio_uart_throttle(struct tty_struct *tty) | |
797 | { | |
798 | struct sdio_uart_port *port = tty->driver_data; | |
799 | ||
800 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
801 | return; | |
802 | ||
803 | if (sdio_uart_claim_func(port) != 0) | |
804 | return; | |
805 | ||
806 | if (I_IXOFF(tty)) { | |
807 | port->x_char = STOP_CHAR(tty); | |
808 | sdio_uart_start_tx(port); | |
809 | } | |
810 | ||
811 | if (tty->termios->c_cflag & CRTSCTS) | |
812 | sdio_uart_clear_mctrl(port, TIOCM_RTS); | |
813 | ||
814 | sdio_uart_irq(port->func); | |
815 | sdio_uart_release_func(port); | |
816 | } | |
817 | ||
818 | static void sdio_uart_unthrottle(struct tty_struct *tty) | |
819 | { | |
820 | struct sdio_uart_port *port = tty->driver_data; | |
821 | ||
822 | if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS)) | |
823 | return; | |
824 | ||
825 | if (sdio_uart_claim_func(port) != 0) | |
826 | return; | |
827 | ||
828 | if (I_IXOFF(tty)) { | |
829 | if (port->x_char) { | |
830 | port->x_char = 0; | |
831 | } else { | |
832 | port->x_char = START_CHAR(tty); | |
833 | sdio_uart_start_tx(port); | |
834 | } | |
835 | } | |
836 | ||
837 | if (tty->termios->c_cflag & CRTSCTS) | |
838 | sdio_uart_set_mctrl(port, TIOCM_RTS); | |
839 | ||
840 | sdio_uart_irq(port->func); | |
841 | sdio_uart_release_func(port); | |
842 | } | |
843 | ||
844 | static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios) | |
845 | { | |
846 | struct sdio_uart_port *port = tty->driver_data; | |
847 | unsigned int cflag = tty->termios->c_cflag; | |
848 | ||
849 | #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) | |
850 | ||
851 | if ((cflag ^ old_termios->c_cflag) == 0 && | |
852 | RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) | |
853 | return; | |
854 | ||
855 | if (sdio_uart_claim_func(port) != 0) | |
856 | return; | |
857 | ||
858 | sdio_uart_change_speed(port, tty->termios, old_termios); | |
859 | ||
860 | /* Handle transition to B0 status */ | |
861 | if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) | |
862 | sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR); | |
863 | ||
864 | /* Handle transition away from B0 status */ | |
865 | if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { | |
866 | unsigned int mask = TIOCM_DTR; | |
867 | if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) | |
868 | mask |= TIOCM_RTS; | |
869 | sdio_uart_set_mctrl(port, mask); | |
870 | } | |
871 | ||
872 | /* Handle turning off CRTSCTS */ | |
873 | if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) { | |
874 | tty->hw_stopped = 0; | |
875 | sdio_uart_start_tx(port); | |
876 | } | |
877 | ||
878 | /* Handle turning on CRTSCTS */ | |
879 | if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { | |
880 | if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) { | |
881 | tty->hw_stopped = 1; | |
882 | sdio_uart_stop_tx(port); | |
883 | } | |
884 | } | |
885 | ||
886 | sdio_uart_release_func(port); | |
887 | } | |
888 | ||
c43d8636 | 889 | static int sdio_uart_break_ctl(struct tty_struct *tty, int break_state) |
6e418a9d NP |
890 | { |
891 | struct sdio_uart_port *port = tty->driver_data; | |
c43d8636 | 892 | int result; |
6e418a9d | 893 | |
c43d8636 DH |
894 | result = sdio_uart_claim_func(port); |
895 | if (result != 0) | |
896 | return result; | |
6e418a9d NP |
897 | |
898 | if (break_state == -1) | |
899 | port->lcr |= UART_LCR_SBC; | |
900 | else | |
901 | port->lcr &= ~UART_LCR_SBC; | |
902 | sdio_out(port, UART_LCR, port->lcr); | |
903 | ||
904 | sdio_uart_release_func(port); | |
c43d8636 | 905 | return 0; |
6e418a9d NP |
906 | } |
907 | ||
908 | static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file) | |
909 | { | |
910 | struct sdio_uart_port *port = tty->driver_data; | |
911 | int result; | |
912 | ||
913 | result = sdio_uart_claim_func(port); | |
914 | if (!result) { | |
915 | result = port->mctrl | sdio_uart_get_mctrl(port); | |
916 | sdio_uart_release_func(port); | |
917 | } | |
918 | ||
919 | return result; | |
920 | } | |
921 | ||
922 | static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file, | |
923 | unsigned int set, unsigned int clear) | |
924 | { | |
925 | struct sdio_uart_port *port = tty->driver_data; | |
926 | int result; | |
927 | ||
928 | result =sdio_uart_claim_func(port); | |
929 | if(!result) { | |
930 | sdio_uart_update_mctrl(port, set, clear); | |
931 | sdio_uart_release_func(port); | |
932 | } | |
933 | ||
934 | return result; | |
935 | } | |
936 | ||
201a50ba | 937 | static int sdio_uart_proc_show(struct seq_file *m, void *v) |
5ed334a1 | 938 | { |
201a50ba | 939 | int i; |
5ed334a1 | 940 | |
201a50ba | 941 | seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n", |
5ed334a1 | 942 | "", "", ""); |
201a50ba | 943 | for (i = 0; i < UART_NR; i++) { |
5ed334a1 NP |
944 | struct sdio_uart_port *port = sdio_uart_port_get(i); |
945 | if (port) { | |
201a50ba | 946 | seq_printf(m, "%d: uart:SDIO", i); |
5ed334a1 | 947 | if(capable(CAP_SYS_ADMIN)) { |
201a50ba | 948 | seq_printf(m, " tx:%d rx:%d", |
5ed334a1 NP |
949 | port->icount.tx, port->icount.rx); |
950 | if (port->icount.frame) | |
201a50ba | 951 | seq_printf(m, " fe:%d", |
5ed334a1 NP |
952 | port->icount.frame); |
953 | if (port->icount.parity) | |
201a50ba | 954 | seq_printf(m, " pe:%d", |
5ed334a1 NP |
955 | port->icount.parity); |
956 | if (port->icount.brk) | |
201a50ba | 957 | seq_printf(m, " brk:%d", |
5ed334a1 NP |
958 | port->icount.brk); |
959 | if (port->icount.overrun) | |
201a50ba | 960 | seq_printf(m, " oe:%d", |
5ed334a1 NP |
961 | port->icount.overrun); |
962 | if (port->icount.cts) | |
201a50ba | 963 | seq_printf(m, " cts:%d", |
5ed334a1 NP |
964 | port->icount.cts); |
965 | if (port->icount.dsr) | |
201a50ba | 966 | seq_printf(m, " dsr:%d", |
5ed334a1 NP |
967 | port->icount.dsr); |
968 | if (port->icount.rng) | |
201a50ba | 969 | seq_printf(m, " rng:%d", |
5ed334a1 NP |
970 | port->icount.rng); |
971 | if (port->icount.dcd) | |
201a50ba | 972 | seq_printf(m, " dcd:%d", |
5ed334a1 NP |
973 | port->icount.dcd); |
974 | } | |
5ed334a1 | 975 | sdio_uart_port_put(port); |
201a50ba | 976 | seq_putc(m, '\n'); |
5ed334a1 NP |
977 | } |
978 | } | |
201a50ba AD |
979 | return 0; |
980 | } | |
5ed334a1 | 981 | |
201a50ba AD |
982 | static int sdio_uart_proc_open(struct inode *inode, struct file *file) |
983 | { | |
984 | return single_open(file, sdio_uart_proc_show, NULL); | |
5ed334a1 NP |
985 | } |
986 | ||
201a50ba AD |
987 | static const struct file_operations sdio_uart_proc_fops = { |
988 | .owner = THIS_MODULE, | |
989 | .open = sdio_uart_proc_open, | |
990 | .read = seq_read, | |
991 | .llseek = seq_lseek, | |
992 | .release = single_release, | |
993 | }; | |
994 | ||
6e418a9d NP |
995 | static const struct tty_operations sdio_uart_ops = { |
996 | .open = sdio_uart_open, | |
997 | .close = sdio_uart_close, | |
998 | .write = sdio_uart_write, | |
999 | .write_room = sdio_uart_write_room, | |
1000 | .chars_in_buffer = sdio_uart_chars_in_buffer, | |
1001 | .send_xchar = sdio_uart_send_xchar, | |
1002 | .throttle = sdio_uart_throttle, | |
1003 | .unthrottle = sdio_uart_unthrottle, | |
1004 | .set_termios = sdio_uart_set_termios, | |
1005 | .break_ctl = sdio_uart_break_ctl, | |
1006 | .tiocmget = sdio_uart_tiocmget, | |
1007 | .tiocmset = sdio_uart_tiocmset, | |
201a50ba | 1008 | .proc_fops = &sdio_uart_proc_fops, |
6e418a9d NP |
1009 | }; |
1010 | ||
1011 | static struct tty_driver *sdio_uart_tty_driver; | |
1012 | ||
1013 | static int sdio_uart_probe(struct sdio_func *func, | |
1014 | const struct sdio_device_id *id) | |
1015 | { | |
1016 | struct sdio_uart_port *port; | |
1017 | int ret; | |
1018 | ||
1019 | port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL); | |
1020 | if (!port) | |
1021 | return -ENOMEM; | |
1022 | ||
1023 | if (func->class == SDIO_CLASS_UART) { | |
1024 | printk(KERN_WARNING "%s: need info on UART class basic setup\n", | |
1025 | sdio_func_id(func)); | |
1026 | kfree(port); | |
1027 | return -ENOSYS; | |
1028 | } else if (func->class == SDIO_CLASS_GPS) { | |
1029 | /* | |
1030 | * We need tuple 0x91. It contains SUBTPL_SIOREG | |
1031 | * and SUBTPL_RCVCAPS. | |
1032 | */ | |
1033 | struct sdio_func_tuple *tpl; | |
1034 | for (tpl = func->tuples; tpl; tpl = tpl->next) { | |
1035 | if (tpl->code != 0x91) | |
1036 | continue; | |
1037 | if (tpl->size < 10) | |
1038 | continue; | |
1039 | if (tpl->data[1] == 0) /* SUBTPL_SIOREG */ | |
1040 | break; | |
1041 | } | |
1042 | if (!tpl) { | |
1043 | printk(KERN_WARNING | |
1044 | "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", | |
1045 | sdio_func_id(func)); | |
1046 | kfree(port); | |
1047 | return -EINVAL; | |
1048 | } | |
1049 | printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n", | |
1050 | sdio_func_id(func), tpl->data[2], tpl->data[3]); | |
1051 | port->regs_offset = (tpl->data[4] << 0) | | |
1052 | (tpl->data[5] << 8) | | |
1053 | (tpl->data[6] << 16); | |
1054 | printk(KERN_DEBUG "%s: regs offset = 0x%x\n", | |
1055 | sdio_func_id(func), port->regs_offset); | |
1056 | port->uartclk = tpl->data[7] * 115200; | |
1057 | if (port->uartclk == 0) | |
1058 | port->uartclk = 115200; | |
1059 | printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n", | |
1060 | sdio_func_id(func), port->uartclk, | |
1061 | tpl->data[7], tpl->data[8] | (tpl->data[9] << 8)); | |
1062 | } else { | |
1063 | kfree(port); | |
1064 | return -EINVAL; | |
1065 | } | |
1066 | ||
1067 | port->func = func; | |
1068 | sdio_set_drvdata(func, port); | |
1069 | ||
1070 | ret = sdio_uart_add_port(port); | |
1071 | if (ret) { | |
1072 | kfree(port); | |
1073 | } else { | |
1074 | struct device *dev; | |
1075 | dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev); | |
1076 | if (IS_ERR(dev)) { | |
1077 | sdio_uart_port_remove(port); | |
1078 | ret = PTR_ERR(dev); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | return ret; | |
1083 | } | |
1084 | ||
1085 | static void sdio_uart_remove(struct sdio_func *func) | |
1086 | { | |
1087 | struct sdio_uart_port *port = sdio_get_drvdata(func); | |
1088 | ||
1089 | tty_unregister_device(sdio_uart_tty_driver, port->index); | |
1090 | sdio_uart_port_remove(port); | |
1091 | } | |
1092 | ||
1093 | static const struct sdio_device_id sdio_uart_ids[] = { | |
1094 | { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) }, | |
1095 | { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) }, | |
1096 | { /* end: all zeroes */ }, | |
1097 | }; | |
1098 | ||
1099 | MODULE_DEVICE_TABLE(sdio, sdio_uart_ids); | |
1100 | ||
1101 | static struct sdio_driver sdio_uart_driver = { | |
1102 | .probe = sdio_uart_probe, | |
1103 | .remove = sdio_uart_remove, | |
1104 | .name = "sdio_uart", | |
1105 | .id_table = sdio_uart_ids, | |
1106 | }; | |
1107 | ||
1108 | static int __init sdio_uart_init(void) | |
1109 | { | |
1110 | int ret; | |
1111 | struct tty_driver *tty_drv; | |
1112 | ||
1113 | sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR); | |
1114 | if (!tty_drv) | |
1115 | return -ENOMEM; | |
1116 | ||
1117 | tty_drv->owner = THIS_MODULE; | |
1118 | tty_drv->driver_name = "sdio_uart"; | |
1119 | tty_drv->name = "ttySDIO"; | |
1120 | tty_drv->major = 0; /* dynamically allocated */ | |
1121 | tty_drv->minor_start = 0; | |
1122 | tty_drv->type = TTY_DRIVER_TYPE_SERIAL; | |
1123 | tty_drv->subtype = SERIAL_TYPE_NORMAL; | |
1124 | tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; | |
1125 | tty_drv->init_termios = tty_std_termios; | |
1126 | tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL; | |
2ba30eed NP |
1127 | tty_drv->init_termios.c_ispeed = 4800; |
1128 | tty_drv->init_termios.c_ospeed = 4800; | |
6e418a9d NP |
1129 | tty_set_operations(tty_drv, &sdio_uart_ops); |
1130 | ||
1131 | ret = tty_register_driver(tty_drv); | |
1132 | if (ret) | |
1133 | goto err1; | |
1134 | ||
1135 | ret = sdio_register_driver(&sdio_uart_driver); | |
1136 | if (ret) | |
1137 | goto err2; | |
1138 | ||
1139 | return 0; | |
1140 | ||
1141 | err2: | |
1142 | tty_unregister_driver(tty_drv); | |
1143 | err1: | |
1144 | put_tty_driver(tty_drv); | |
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | static void __exit sdio_uart_exit(void) | |
1149 | { | |
1150 | sdio_unregister_driver(&sdio_uart_driver); | |
1151 | tty_unregister_driver(sdio_uart_tty_driver); | |
1152 | put_tty_driver(sdio_uart_tty_driver); | |
1153 | } | |
1154 | ||
1155 | module_init(sdio_uart_init); | |
1156 | module_exit(sdio_uart_exit); | |
1157 | ||
1158 | MODULE_AUTHOR("Nicolas Pitre"); | |
1159 | MODULE_LICENSE("GPL"); |