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Serial: EG20T: add PCH_UART driver
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / serial / ifx6x60.c
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af3b8881
RG		 1/****************************************************************************
2 *
3 * Driver for the IFX 6x60 spi modem.
4 *
5 * Copyright (C) 2008 Option International
6 * Copyright (C) 2008 Filip Aben <f.aben@option.com>
7 * Denis Joseph Barrow <d.barow@option.com>
8 * Jan Dumon <j.dumon@option.com>
9 *
10 * Copyright (C) 2009, 2010 Intel Corp
11 * Russ Gorby <richardx.r.gorby@intel.com>
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
25 * USA
26 *
27 * Driver modified by Intel from Option gtm501l_spi.c
28 *
29 * Notes
30 * o The driver currently assumes a single device only. If you need to
31 * change this then look for saved_ifx_dev and add a device lookup
32 * o The driver is intended to be big-endian safe but has never been
33 * tested that way (no suitable hardware). There are a couple of FIXME
34 * notes by areas that may need addressing
35 * o Some of the GPIO naming/setup assumptions may need revisiting if
36 * you need to use this driver for another platform.
37 *
38 *****************************************************************************/
39#include <linux/module.h>
40#include <linux/termios.h>
41#include <linux/tty.h>
42#include <linux/device.h>
43#include <linux/spi/spi.h>
44#include <linux/tty.h>
45#include <linux/kfifo.h>
46#include <linux/tty_flip.h>
47#include <linux/timer.h>
48#include <linux/serial.h>
49#include <linux/interrupt.h>
50#include <linux/irq.h>
51#include <linux/rfkill.h>
52#include <linux/fs.h>
53#include <linux/ip.h>
54#include <linux/dmapool.h>
55#include <linux/gpio.h>
56#include <linux/sched.h>
57#include <linux/time.h>
58#include <linux/wait.h>
59#include <linux/tty.h>
60#include <linux/pm.h>
61#include <linux/pm_runtime.h>
62#include <linux/spi/ifx_modem.h>
83abd0d8 63#include <linux/delay.h>
af3b8881
RG		 64
65#include "ifx6x60.h"
66
67#define IFX_SPI_MORE_MASK 0x10
68#define IFX_SPI_MORE_BIT 12 /* bit position in u16 */
69#define IFX_SPI_CTS_BIT 13 /* bit position in u16 */
70#define IFX_SPI_TTY_ID 0
71#define IFX_SPI_TIMEOUT_SEC 2
72#define IFX_SPI_HEADER_0 (-1)
73#define IFX_SPI_HEADER_F (-2)
74
75/* forward reference */
76static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
77
78/* local variables */
79static int spi_b16 = 1; /* 8 or 16 bit word length */
80static struct tty_driver *tty_drv;
81static struct ifx_spi_device *saved_ifx_dev;
82static struct lock_class_key ifx_spi_key;
83
84/* GPIO/GPE settings */
85
86/**
87 * mrdy_set_high - set MRDY GPIO
88 * @ifx: device we are controlling
89 *
90 */
91static inline void mrdy_set_high(struct ifx_spi_device *ifx)
92{
93 gpio_set_value(ifx->gpio.mrdy, 1);
94}
95
96/**
97 * mrdy_set_low - clear MRDY GPIO
98 * @ifx: device we are controlling
99 *
100 */
101static inline void mrdy_set_low(struct ifx_spi_device *ifx)
102{
103 gpio_set_value(ifx->gpio.mrdy, 0);
104}
105
106/**
107 * ifx_spi_power_state_set
108 * @ifx_dev: our SPI device
109 * @val: bits to set
110 *
111 * Set bit in power status and signal power system if status becomes non-0
112 */
113static void
114ifx_spi_power_state_set(struct ifx_spi_device *ifx_dev, unsigned char val)
115{
116 unsigned long flags;
117
118 spin_lock_irqsave(&ifx_dev->power_lock, flags);
119
120 /*
121 * if power status is already non-0, just update, else
122 * tell power system
123 */
124 if (!ifx_dev->power_status)
125 pm_runtime_get(&ifx_dev->spi_dev->dev);
126 ifx_dev->power_status |= val;
127
128 spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
129}
130
131/**
132 * ifx_spi_power_state_clear - clear power bit
133 * @ifx_dev: our SPI device
134 * @val: bits to clear
135 *
136 * clear bit in power status and signal power system if status becomes 0
137 */
138static void
139ifx_spi_power_state_clear(struct ifx_spi_device *ifx_dev, unsigned char val)
140{
141 unsigned long flags;
142
143 spin_lock_irqsave(&ifx_dev->power_lock, flags);
144
145 if (ifx_dev->power_status) {
146 ifx_dev->power_status &= ~val;
147 if (!ifx_dev->power_status)
148 pm_runtime_put(&ifx_dev->spi_dev->dev);
149 }
150
151 spin_unlock_irqrestore(&ifx_dev->power_lock, flags);
152}
153
154/**
155 * swap_buf
156 * @buf: our buffer
157 * @len : number of bytes (not words) in the buffer
158 * @end: end of buffer
159 *
160 * Swap the contents of a buffer into big endian format
161 */
162static inline void swap_buf(u16 *buf, int len, void *end)
163{
164 int n;
165
166 len = ((len + 1) >> 1);
167 if ((void *)&buf[len] > end) {
168 pr_err("swap_buf: swap exceeds boundary (%p > %p)!",
169 &buf[len], end);
170 return;
171 }
172 for (n = 0; n < len; n++) {
173 *buf = cpu_to_be16(*buf);
174 buf++;
175 }
176}
177
178/**
179 * mrdy_assert - assert MRDY line
180 * @ifx_dev: our SPI device
181 *
182 * Assert mrdy and set timer to wait for SRDY interrupt, if SRDY is low
183 * now.
184 *
185 * FIXME: Can SRDY even go high as we are running this code ?
186 */
187static void mrdy_assert(struct ifx_spi_device *ifx_dev)
188{
189 int val = gpio_get_value(ifx_dev->gpio.srdy);
190 if (!val) {
191 if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING,
192 &ifx_dev->flags)) {
193 ifx_dev->spi_timer.expires =
194 jiffies + IFX_SPI_TIMEOUT_SEC*HZ;
195 add_timer(&ifx_dev->spi_timer);
196
197 }
198 }
199 ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_DATA_PENDING);
200 mrdy_set_high(ifx_dev);
201}
202
203/**
204 * ifx_spi_hangup - hang up an IFX device
205 * @ifx_dev: our SPI device
206 *
207 * Hang up the tty attached to the IFX device if one is currently
208 * open. If not take no action
209 */
210static void ifx_spi_ttyhangup(struct ifx_spi_device *ifx_dev)
211{
212 struct tty_port *pport = &ifx_dev->tty_port;
213 struct tty_struct *tty = tty_port_tty_get(pport);
214 if (tty) {
215 tty_hangup(tty);
216 tty_kref_put(tty);
217 }
218}
219
220/**
221 * ifx_spi_timeout - SPI timeout
222 * @arg: our SPI device
223 *
224 * The SPI has timed out: hang up the tty. Users will then see a hangup
225 * and error events.
226 */
227static void ifx_spi_timeout(unsigned long arg)
228{
229 struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *)arg;
230
231 dev_warn(&ifx_dev->spi_dev->dev, "*** SPI Timeout ***");
232 ifx_spi_ttyhangup(ifx_dev);
233 mrdy_set_low(ifx_dev);
234 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
235}
236
237/* char/tty operations */
238
239/**
240 * ifx_spi_tiocmget - get modem lines
241 * @tty: our tty device
242 * @filp: file handle issuing the request
243 *
244 * Map the signal state into Linux modem flags and report the value
245 * in Linux terms
246 */
247static int ifx_spi_tiocmget(struct tty_struct *tty, struct file *filp)
248{
249 unsigned int value;
250 struct ifx_spi_device *ifx_dev = tty->driver_data;
251
252 value =
253 (test_bit(IFX_SPI_RTS, &ifx_dev->signal_state) ? TIOCM_RTS : 0) |
254 (test_bit(IFX_SPI_DTR, &ifx_dev->signal_state) ? TIOCM_DTR : 0) |
255 (test_bit(IFX_SPI_CTS, &ifx_dev->signal_state) ? TIOCM_CTS : 0) |
256 (test_bit(IFX_SPI_DSR, &ifx_dev->signal_state) ? TIOCM_DSR : 0) |
257 (test_bit(IFX_SPI_DCD, &ifx_dev->signal_state) ? TIOCM_CAR : 0) |
258 (test_bit(IFX_SPI_RI, &ifx_dev->signal_state) ? TIOCM_RNG : 0);
259 return value;
260}
261
262/**
263 * ifx_spi_tiocmset - set modem bits
264 * @tty: the tty structure
265 * @filp: file handle issuing the request
266 * @set: bits to set
267 * @clear: bits to clear
268 *
269 * The IFX6x60 only supports DTR and RTS. Set them accordingly
270 * and flag that an update to the modem is needed.
271 *
272 * FIXME: do we need to kick the tranfers when we do this ?
273 */
274static int ifx_spi_tiocmset(struct tty_struct *tty, struct file *filp,
275 unsigned int set, unsigned int clear)
276{
277 struct ifx_spi_device *ifx_dev = tty->driver_data;
278
279 if (set & TIOCM_RTS)
280 set_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
281 if (set & TIOCM_DTR)
282 set_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
283 if (clear & TIOCM_RTS)
284 clear_bit(IFX_SPI_RTS, &ifx_dev->signal_state);
285 if (clear & TIOCM_DTR)
286 clear_bit(IFX_SPI_DTR, &ifx_dev->signal_state);
287
288 set_bit(IFX_SPI_UPDATE, &ifx_dev->signal_state);
289 return 0;
290}
291
292/**
293 * ifx_spi_open - called on tty open
294 * @tty: our tty device
295 * @filp: file handle being associated with the tty
296 *
297 * Open the tty interface. We let the tty_port layer do all the work
298 * for us.
299 *
300 * FIXME: Remove single device assumption and saved_ifx_dev
301 */
302static int ifx_spi_open(struct tty_struct *tty, struct file *filp)
303{
304 return tty_port_open(&saved_ifx_dev->tty_port, tty, filp);
305}
306
307/**
308 * ifx_spi_close - called when our tty closes
309 * @tty: the tty being closed
310 * @filp: the file handle being closed
311 *
312 * Perform the close of the tty. We use the tty_port layer to do all
313 * our hard work.
314 */
315static void ifx_spi_close(struct tty_struct *tty, struct file *filp)
316{
317 struct ifx_spi_device *ifx_dev = tty->driver_data;
318 tty_port_close(&ifx_dev->tty_port, tty, filp);
319 /* FIXME: should we do an ifx_spi_reset here ? */
320}
321
322/**
323 * ifx_decode_spi_header - decode received header
324 * @buffer: the received data
325 * @length: decoded length
326 * @more: decoded more flag
327 * @received_cts: status of cts we received
328 *
329 * Note how received_cts is handled -- if header is all F it is left
330 * the same as it was, if header is all 0 it is set to 0 otherwise it is
331 * taken from the incoming header.
332 *
333 * FIXME: endianness
334 */
335static int ifx_spi_decode_spi_header(unsigned char *buffer, int *length,
336 unsigned char *more, unsigned char *received_cts)
337{
338 u16 h1;
339 u16 h2;
340 u16 *in_buffer = (u16 *)buffer;
341
342 h1 = *in_buffer;
343 h2 = *(in_buffer+1);
344
345 if (h1 == 0 && h2 == 0) {
346 *received_cts = 0;
347 return IFX_SPI_HEADER_0;
348 } else if (h1 == 0xffff && h2 == 0xffff) {
349 /* spi_slave_cts remains as it was */
350 return IFX_SPI_HEADER_F;
351 }
352
353 *length = h1 & 0xfff; /* upper bits of byte are flags */
354 *more = (buffer[1] >> IFX_SPI_MORE_BIT) & 1;
355 *received_cts = (buffer[3] >> IFX_SPI_CTS_BIT) & 1;
356 return 0;
357}
358
359/**
360 * ifx_setup_spi_header - set header fields
361 * @txbuffer: pointer to start of SPI buffer
362 * @tx_count: bytes
363 * @more: indicate if more to follow
364 *
365 * Format up an SPI header for a transfer
366 *
367 * FIXME: endianness?
368 */
369static void ifx_spi_setup_spi_header(unsigned char *txbuffer, int tx_count,
370 unsigned char more)
371{
372 *(u16 *)(txbuffer) = tx_count;
373 *(u16 *)(txbuffer+2) = IFX_SPI_PAYLOAD_SIZE;
374 txbuffer[1] |= (more << IFX_SPI_MORE_BIT) & IFX_SPI_MORE_MASK;
375}
376
377/**
378 * ifx_spi_wakeup_serial - SPI space made
379 * @port_data: our SPI device
380 *
381 * We have emptied the FIFO enough that we want to get more data
382 * queued into it. Poke the line discipline via tty_wakeup so that
383 * it will feed us more bits
384 */
385static void ifx_spi_wakeup_serial(struct ifx_spi_device *ifx_dev)
386{
387 struct tty_struct *tty;
388
389 tty = tty_port_tty_get(&ifx_dev->tty_port);
390 if (!tty)
391 return;
392 tty_wakeup(tty);
393 tty_kref_put(tty);
394}
395
396/**
397 * ifx_spi_prepare_tx_buffer - prepare transmit frame
398 * @ifx_dev: our SPI device
399 *
400 * The transmit buffr needs a header and various other bits of
401 * information followed by as much data as we can pull from the FIFO
402 * and transfer. This function formats up a suitable buffer in the
403 * ifx_dev->tx_buffer
404 *
405 * FIXME: performance - should we wake the tty when the queue is half
406 * empty ?
407 */
408static int ifx_spi_prepare_tx_buffer(struct ifx_spi_device *ifx_dev)
409{
410 int temp_count;
411 int queue_length;
412 int tx_count;
413 unsigned char *tx_buffer;
414
415 tx_buffer = ifx_dev->tx_buffer;
416 memset(tx_buffer, 0, IFX_SPI_TRANSFER_SIZE);
417
418 /* make room for required SPI header */
419 tx_buffer += IFX_SPI_HEADER_OVERHEAD;
420 tx_count = IFX_SPI_HEADER_OVERHEAD;
421
422 /* clear to signal no more data if this turns out to be the
423 * last buffer sent in a sequence */
424 ifx_dev->spi_more = 0;
425
426 /* if modem cts is set, just send empty buffer */
427 if (!ifx_dev->spi_slave_cts) {
428 /* see if there's tx data */
429 queue_length = kfifo_len(&ifx_dev->tx_fifo);
430 if (queue_length != 0) {
431 /* data to mux -- see if there's room for it */
432 temp_count = min(queue_length, IFX_SPI_PAYLOAD_SIZE);
433 temp_count = kfifo_out_locked(&ifx_dev->tx_fifo,
434 tx_buffer, temp_count,
435 &ifx_dev->fifo_lock);
436
437 /* update buffer pointer and data count in message */
438 tx_buffer += temp_count;
439 tx_count += temp_count;
440 if (temp_count == queue_length)
441 /* poke port to get more data */
442 ifx_spi_wakeup_serial(ifx_dev);
443 else /* more data in port, use next SPI message */
444 ifx_dev->spi_more = 1;
445 }
446 }
447 /* have data and info for header -- set up SPI header in buffer */
448 /* spi header needs payload size, not entire buffer size */
449 ifx_spi_setup_spi_header(ifx_dev->tx_buffer,
450 tx_count-IFX_SPI_HEADER_OVERHEAD,
451 ifx_dev->spi_more);
452 /* swap actual data in the buffer */
453 swap_buf((u16 *)(ifx_dev->tx_buffer), tx_count,
454 &ifx_dev->tx_buffer[IFX_SPI_TRANSFER_SIZE]);
455 return tx_count;
456}
457
458/**
459 * ifx_spi_write - line discipline write
460 * @tty: our tty device
461 * @buf: pointer to buffer to write (kernel space)
462 * @count: size of buffer
463 *
464 * Write the characters we have been given into the FIFO. If the device
465 * is not active then activate it, when the SRDY line is asserted back
466 * this will commence I/O
467 */
468static int ifx_spi_write(struct tty_struct *tty, const unsigned char *buf,
469 int count)
470{
471 struct ifx_spi_device *ifx_dev = tty->driver_data;
472 unsigned char *tmp_buf = (unsigned char *)buf;
473 int tx_count = kfifo_in_locked(&ifx_dev->tx_fifo, tmp_buf, count,
474 &ifx_dev->fifo_lock);
475 mrdy_assert(ifx_dev);
476 return tx_count;
477}
478
479/**
480 * ifx_spi_chars_in_buffer - line discipline helper
481 * @tty: our tty device
482 *
483 * Report how much data we can accept before we drop bytes. As we use
484 * a simple FIFO this is nice and easy.
485 */
486static int ifx_spi_write_room(struct tty_struct *tty)
487{
488 struct ifx_spi_device *ifx_dev = tty->driver_data;
489 return IFX_SPI_FIFO_SIZE - kfifo_len(&ifx_dev->tx_fifo);
490}
491
492/**
493 * ifx_spi_chars_in_buffer - line discipline helper
494 * @tty: our tty device
495 *
496 * Report how many characters we have buffered. In our case this is the
497 * number of bytes sitting in our transmit FIFO.
498 */
499static int ifx_spi_chars_in_buffer(struct tty_struct *tty)
500{
501 struct ifx_spi_device *ifx_dev = tty->driver_data;
502 return kfifo_len(&ifx_dev->tx_fifo);
503}
504
505/**
506 * ifx_port_hangup
507 * @port: our tty port
508 *
509 * tty port hang up. Called when tty_hangup processing is invoked either
510 * by loss of carrier, or by software (eg vhangup). Serialized against
511 * activate/shutdown by the tty layer.
512 */
513static void ifx_spi_hangup(struct tty_struct *tty)
514{
515 struct ifx_spi_device *ifx_dev = tty->driver_data;
516 tty_port_hangup(&ifx_dev->tty_port);
517}
518
519/**
520 * ifx_port_activate
521 * @port: our tty port
522 *
523 * tty port activate method - called for first open. Serialized
524 * with hangup and shutdown by the tty layer.
525 */
526static int ifx_port_activate(struct tty_port *port, struct tty_struct *tty)
527{
528 struct ifx_spi_device *ifx_dev =
529 container_of(port, struct ifx_spi_device, tty_port);
530
531 /* clear any old data; can't do this in 'close' */
532 kfifo_reset(&ifx_dev->tx_fifo);
533
534 /* put port data into this tty */
535 tty->driver_data = ifx_dev;
536
537 /* allows flip string push from int context */
538 tty->low_latency = 1;
539
540 return 0;
541}
542
543/**
544 * ifx_port_shutdown
545 * @port: our tty port
546 *
547 * tty port shutdown method - called for last port close. Serialized
548 * with hangup and activate by the tty layer.
549 */
550static void ifx_port_shutdown(struct tty_port *port)
551{
552 struct ifx_spi_device *ifx_dev =
553 container_of(port, struct ifx_spi_device, tty_port);
554
555 mrdy_set_low(ifx_dev);
556 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
557 tasklet_kill(&ifx_dev->io_work_tasklet);
558}
559
560static const struct tty_port_operations ifx_tty_port_ops = {
561 .activate = ifx_port_activate,
562 .shutdown = ifx_port_shutdown,
563};
564
565static const struct tty_operations ifx_spi_serial_ops = {
566 .open = ifx_spi_open,
567 .close = ifx_spi_close,
568 .write = ifx_spi_write,
569 .hangup = ifx_spi_hangup,
570 .write_room = ifx_spi_write_room,
571 .chars_in_buffer = ifx_spi_chars_in_buffer,
572 .tiocmget = ifx_spi_tiocmget,
573 .tiocmset = ifx_spi_tiocmset,
574};
575
576/**
577 * ifx_spi_insert_fip_string - queue received data
578 * @ifx_ser: our SPI device
579 * @chars: buffer we have received
580 * @size: number of chars reeived
581 *
582 * Queue bytes to the tty assuming the tty side is currently open. If
583 * not the discard the data.
584 */
585static void ifx_spi_insert_flip_string(struct ifx_spi_device *ifx_dev,
586 unsigned char *chars, size_t size)
587{
588 struct tty_struct *tty = tty_port_tty_get(&ifx_dev->tty_port);
589 if (!tty)
590 return;
591 tty_insert_flip_string(tty, chars, size);
592 tty_flip_buffer_push(tty);
593 tty_kref_put(tty);
594}
595
596/**
597 * ifx_spi_complete - SPI transfer completed
598 * @ctx: our SPI device
599 *
600 * An SPI transfer has completed. Process any received data and kick off
601 * any further transmits we can commence.
602 */
603static void ifx_spi_complete(void *ctx)
604{
605 struct ifx_spi_device *ifx_dev = ctx;
606 struct tty_struct *tty;
607 struct tty_ldisc *ldisc = NULL;
608 int length;
609 int actual_length;
610 unsigned char more;
611 unsigned char cts;
612 int local_write_pending = 0;
613 int queue_length;
614 int srdy;
615 int decode_result;
616
617 mrdy_set_low(ifx_dev);
618
619 if (!ifx_dev->spi_msg.status) {
620 /* check header validity, get comm flags */
621 swap_buf((u16 *)ifx_dev->rx_buffer, IFX_SPI_HEADER_OVERHEAD,
622 &ifx_dev->rx_buffer[IFX_SPI_HEADER_OVERHEAD]);
623 decode_result = ifx_spi_decode_spi_header(ifx_dev->rx_buffer,
624 &length, &more, &cts);
625 if (decode_result == IFX_SPI_HEADER_0) {
626 dev_dbg(&ifx_dev->spi_dev->dev,
627 "ignore input: invalid header 0");
628 ifx_dev->spi_slave_cts = 0;
629 goto complete_exit;
630 } else if (decode_result == IFX_SPI_HEADER_F) {
631 dev_dbg(&ifx_dev->spi_dev->dev,
632 "ignore input: invalid header F");
633 goto complete_exit;
634 }
635
636 ifx_dev->spi_slave_cts = cts;
637
638 actual_length = min((unsigned int)length,
639 ifx_dev->spi_msg.actual_length);
640 swap_buf((u16 *)(ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD),
641 actual_length,
642 &ifx_dev->rx_buffer[IFX_SPI_TRANSFER_SIZE]);
643 ifx_spi_insert_flip_string(
644 ifx_dev,
645 ifx_dev->rx_buffer + IFX_SPI_HEADER_OVERHEAD,
646 (size_t)actual_length);
647 } else {
648 dev_dbg(&ifx_dev->spi_dev->dev, "SPI transfer error %d",
649 ifx_dev->spi_msg.status);
650 }
651
652complete_exit:
653 if (ifx_dev->write_pending) {
654 ifx_dev->write_pending = 0;
655 local_write_pending = 1;
656 }
657
658 clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &(ifx_dev->flags));
659
660 queue_length = kfifo_len(&ifx_dev->tx_fifo);
661 srdy = gpio_get_value(ifx_dev->gpio.srdy);
662 if (!srdy)
663 ifx_spi_power_state_clear(ifx_dev, IFX_SPI_POWER_SRDY);
664
665 /* schedule output if there is more to do */
666 if (test_and_clear_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags))
667 tasklet_schedule(&ifx_dev->io_work_tasklet);
668 else {
669 if (more || ifx_dev->spi_more || queue_length > 0 ||
670 local_write_pending) {
671 if (ifx_dev->spi_slave_cts) {
672 if (more)
673 mrdy_assert(ifx_dev);
674 } else
675 mrdy_assert(ifx_dev);
676 } else {
677 /*
678 * poke line discipline driver if any for more data
679 * may or may not get more data to write
680 * for now, say not busy
681 */
682 ifx_spi_power_state_clear(ifx_dev,
683 IFX_SPI_POWER_DATA_PENDING);
684 tty = tty_port_tty_get(&ifx_dev->tty_port);
685 if (tty) {
686 ldisc = tty_ldisc_ref(tty);
687 if (ldisc) {
688 ldisc->ops->write_wakeup(tty);
689 tty_ldisc_deref(ldisc);
690 }
691 tty_kref_put(tty);
692 }
693 }
694 }
695}
696
697/**
698 * ifx_spio_io - I/O tasklet
699 * @data: our SPI device
700 *
701 * Queue data for transmission if possible and then kick off the
702 * transfer.
703 */
704static void ifx_spi_io(unsigned long data)
705{
706 int retval;
707 struct ifx_spi_device *ifx_dev = (struct ifx_spi_device *) data;
708
709 if (!test_and_set_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags)) {
710 if (ifx_dev->gpio.unack_srdy_int_nb > 0)
711 ifx_dev->gpio.unack_srdy_int_nb--;
712
713 ifx_spi_prepare_tx_buffer(ifx_dev);
714
715 spi_message_init(&ifx_dev->spi_msg);
716 INIT_LIST_HEAD(&ifx_dev->spi_msg.queue);
717
718 ifx_dev->spi_msg.context = ifx_dev;
719 ifx_dev->spi_msg.complete = ifx_spi_complete;
720
721 /* set up our spi transfer */
722 /* note len is BYTES, not transfers */
723 ifx_dev->spi_xfer.len = IFX_SPI_TRANSFER_SIZE;
724 ifx_dev->spi_xfer.cs_change = 0;
725 ifx_dev->spi_xfer.speed_hz = 12500000;
726 /* ifx_dev->spi_xfer.speed_hz = 390625; */
727 ifx_dev->spi_xfer.bits_per_word = spi_b16 ? 16 : 8;
728
729 ifx_dev->spi_xfer.tx_buf = ifx_dev->tx_buffer;
730 ifx_dev->spi_xfer.rx_buf = ifx_dev->rx_buffer;
731
732 /*
733 * setup dma pointers
734 */
735 if (ifx_dev->is_6160) {
736 ifx_dev->spi_msg.is_dma_mapped = 1;
737 ifx_dev->tx_dma = ifx_dev->tx_bus;
738 ifx_dev->rx_dma = ifx_dev->rx_bus;
739 ifx_dev->spi_xfer.tx_dma = ifx_dev->tx_dma;
740 ifx_dev->spi_xfer.rx_dma = ifx_dev->rx_dma;
741 } else {
742 ifx_dev->spi_msg.is_dma_mapped = 0;
743 ifx_dev->tx_dma = (dma_addr_t)0;
744 ifx_dev->rx_dma = (dma_addr_t)0;
745 ifx_dev->spi_xfer.tx_dma = (dma_addr_t)0;
746 ifx_dev->spi_xfer.rx_dma = (dma_addr_t)0;
747 }
748
749 spi_message_add_tail(&ifx_dev->spi_xfer, &ifx_dev->spi_msg);
750
751 /* Assert MRDY. This may have already been done by the write
752 * routine.
753 */
754 mrdy_assert(ifx_dev);
755
756 retval = spi_async(ifx_dev->spi_dev, &ifx_dev->spi_msg);
757 if (retval) {
758 clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS,
759 &ifx_dev->flags);
760 tasklet_schedule(&ifx_dev->io_work_tasklet);
761 return;
762 }
763 } else
764 ifx_dev->write_pending = 1;
765}
766
767/**
768 * ifx_spi_free_port - free up the tty side
769 * @ifx_dev: IFX device going away
770 *
771 * Unregister and free up a port when the device goes away
772 */
773static void ifx_spi_free_port(struct ifx_spi_device *ifx_dev)
774{
775 if (ifx_dev->tty_dev)
776 tty_unregister_device(tty_drv, ifx_dev->minor);
777 kfifo_free(&ifx_dev->tx_fifo);
778}
779
780/**
781 * ifx_spi_create_port - create a new port
782 * @ifx_dev: our spi device
783 *
784 * Allocate and initialise the tty port that goes with this interface
785 * and add it to the tty layer so that it can be opened.
786 */
787static int ifx_spi_create_port(struct ifx_spi_device *ifx_dev)
788{
789 int ret = 0;
790 struct tty_port *pport = &ifx_dev->tty_port;
791
792 spin_lock_init(&ifx_dev->fifo_lock);
793 lockdep_set_class_and_subclass(&ifx_dev->fifo_lock,
794 &ifx_spi_key, 0);
795
796 if (kfifo_alloc(&ifx_dev->tx_fifo, IFX_SPI_FIFO_SIZE, GFP_KERNEL)) {
797 ret = -ENOMEM;
798 goto error_ret;
799 }
800
801 pport->ops = &ifx_tty_port_ops;
802 tty_port_init(pport);
803 ifx_dev->minor = IFX_SPI_TTY_ID;
804 ifx_dev->tty_dev = tty_register_device(tty_drv, ifx_dev->minor,
805 &ifx_dev->spi_dev->dev);
806 if (IS_ERR(ifx_dev->tty_dev)) {
807 dev_dbg(&ifx_dev->spi_dev->dev,
808 "%s: registering tty device failed", __func__);
809 ret = PTR_ERR(ifx_dev->tty_dev);
810 goto error_ret;
811 }
812 return 0;
813
814error_ret:
815 ifx_spi_free_port(ifx_dev);
816 return ret;
817}
818
819/**
820 * ifx_spi_handle_srdy - handle SRDY
821 * @ifx_dev: device asserting SRDY
822 *
823 * Check our device state and see what we need to kick off when SRDY
824 * is asserted. This usually means killing the timer and firing off the
825 * I/O processing.
826 */
827static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev)
828{
829 if (test_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) {
830 del_timer_sync(&ifx_dev->spi_timer);
831 clear_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags);
832 }
833
834 ifx_spi_power_state_set(ifx_dev, IFX_SPI_POWER_SRDY);
835
836 if (!test_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags))
837 tasklet_schedule(&ifx_dev->io_work_tasklet);
838 else
839 set_bit(IFX_SPI_STATE_IO_READY, &ifx_dev->flags);
840}
841
842/**
843 * ifx_spi_srdy_interrupt - SRDY asserted
844 * @irq: our IRQ number
845 * @dev: our ifx device
846 *
847 * The modem asserted SRDY. Handle the srdy event
848 */
849static irqreturn_t ifx_spi_srdy_interrupt(int irq, void *dev)
850{
851 struct ifx_spi_device *ifx_dev = dev;
852 ifx_dev->gpio.unack_srdy_int_nb++;
853 ifx_spi_handle_srdy(ifx_dev);
854 return IRQ_HANDLED;
855}
856
857/**
858 * ifx_spi_reset_interrupt - Modem has changed reset state
859 * @irq: interrupt number
860 * @dev: our device pointer
861 *
862 * The modem has either entered or left reset state. Check the GPIO
863 * line to see which.
864 *
865 * FIXME: review locking on MR_INPROGRESS versus
866 * parallel unsolicited reset/solicited reset
867 */
868static irqreturn_t ifx_spi_reset_interrupt(int irq, void *dev)
869{
870 struct ifx_spi_device *ifx_dev = dev;
871 int val = gpio_get_value(ifx_dev->gpio.reset_out);
872 int solreset = test_bit(MR_START, &ifx_dev->mdm_reset_state);
873
874 if (val == 0) {
875 /* entered reset */
876 set_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
877 if (!solreset) {
878 /* unsolicited reset */
879 ifx_spi_ttyhangup(ifx_dev);
880 }
881 } else {
882 /* exited reset */
883 clear_bit(MR_INPROGRESS, &ifx_dev->mdm_reset_state);
884 if (solreset) {
885 set_bit(MR_COMPLETE, &ifx_dev->mdm_reset_state);
886 wake_up(&ifx_dev->mdm_reset_wait);
887 }
888 }
889 return IRQ_HANDLED;
890}
891
892/**
893 * ifx_spi_free_device - free device
894 * @ifx_dev: device to free
895 *
896 * Free the IFX device
897 */
898static void ifx_spi_free_device(struct ifx_spi_device *ifx_dev)
899{
900 ifx_spi_free_port(ifx_dev);
901 dma_free_coherent(&ifx_dev->spi_dev->dev,
902 IFX_SPI_TRANSFER_SIZE,
903 ifx_dev->tx_buffer,
904 ifx_dev->tx_bus);
905 dma_free_coherent(&ifx_dev->spi_dev->dev,
906 IFX_SPI_TRANSFER_SIZE,
907 ifx_dev->rx_buffer,
908 ifx_dev->rx_bus);
909}
910
911/**
912 * ifx_spi_reset - reset modem
913 * @ifx_dev: modem to reset
914 *
915 * Perform a reset on the modem
916 */
917static int ifx_spi_reset(struct ifx_spi_device *ifx_dev)
918{
919 int ret;
920 /*
921 * set up modem power, reset
922 *
923 * delays are required on some platforms for the modem
924 * to reset properly
925 */
926 set_bit(MR_START, &ifx_dev->mdm_reset_state);
927 gpio_set_value(ifx_dev->gpio.po, 0);
928 gpio_set_value(ifx_dev->gpio.reset, 0);
929 msleep(25);
930 gpio_set_value(ifx_dev->gpio.reset, 1);
931 msleep(1);
932 gpio_set_value(ifx_dev->gpio.po, 1);
933 msleep(1);
934 gpio_set_value(ifx_dev->gpio.po, 0);
935 ret = wait_event_timeout(ifx_dev->mdm_reset_wait,
936 test_bit(MR_COMPLETE,
937 &ifx_dev->mdm_reset_state),
938 IFX_RESET_TIMEOUT);
939 if (!ret)
940 dev_warn(&ifx_dev->spi_dev->dev, "Modem reset timeout: (state:%lx)",
941 ifx_dev->mdm_reset_state);
942
943 ifx_dev->mdm_reset_state = 0;
944 return ret;
945}
946
947/**
948 * ifx_spi_spi_probe - probe callback
949 * @spi: our possible matching SPI device
950 *
951 * Probe for a 6x60 modem on SPI bus. Perform any needed device and
952 * GPIO setup.
953 *
954 * FIXME:
955 * - Support for multiple devices
956 * - Split out MID specific GPIO handling eventually
957 */
958
959static int ifx_spi_spi_probe(struct spi_device *spi)
960{
961 int ret;
962 int srdy;
963 struct ifx_modem_platform_data *pl_data = NULL;
964 struct ifx_spi_device *ifx_dev;
965
966 if (saved_ifx_dev) {
967 dev_dbg(&spi->dev, "ignoring subsequent detection");
968 return -ENODEV;
969 }
970
971 /* initialize structure to hold our device variables */
972 ifx_dev = kzalloc(sizeof(struct ifx_spi_device), GFP_KERNEL);
973 if (!ifx_dev) {
974 dev_err(&spi->dev, "spi device allocation failed");
975 return -ENOMEM;
976 }
977 saved_ifx_dev = ifx_dev;
978 ifx_dev->spi_dev = spi;
979 clear_bit(IFX_SPI_STATE_IO_IN_PROGRESS, &ifx_dev->flags);
980 spin_lock_init(&ifx_dev->write_lock);
981 spin_lock_init(&ifx_dev->power_lock);
982 ifx_dev->power_status = 0;
983 init_timer(&ifx_dev->spi_timer);
984 ifx_dev->spi_timer.function = ifx_spi_timeout;
985 ifx_dev->spi_timer.data = (unsigned long)ifx_dev;
986 ifx_dev->is_6160 = pl_data->is_6160;
987
988 /* ensure SPI protocol flags are initialized to enable transfer */
989 ifx_dev->spi_more = 0;
990 ifx_dev->spi_slave_cts = 0;
991
992 /*initialize transfer and dma buffers */
993 ifx_dev->tx_buffer = dma_alloc_coherent(&ifx_dev->spi_dev->dev,
994 IFX_SPI_TRANSFER_SIZE,
995 &ifx_dev->tx_bus,
996 GFP_KERNEL);
997 if (!ifx_dev->tx_buffer) {
998 dev_err(&spi->dev, "DMA-TX buffer allocation failed");
999 ret = -ENOMEM;
1000 goto error_ret;
1001 }
1002 ifx_dev->rx_buffer = dma_alloc_coherent(&ifx_dev->spi_dev->dev,
1003 IFX_SPI_TRANSFER_SIZE,
1004 &ifx_dev->rx_bus,
1005 GFP_KERNEL);
1006 if (!ifx_dev->rx_buffer) {
1007 dev_err(&spi->dev, "DMA-RX buffer allocation failed");
1008 ret = -ENOMEM;
1009 goto error_ret;
1010 }
1011
1012 /* initialize waitq for modem reset */
1013 init_waitqueue_head(&ifx_dev->mdm_reset_wait);
1014
1015 spi_set_drvdata(spi, ifx_dev);
1016 tasklet_init(&ifx_dev->io_work_tasklet, ifx_spi_io,
1017 (unsigned long)ifx_dev);
1018
1019 set_bit(IFX_SPI_STATE_PRESENT, &ifx_dev->flags);
1020
1021 /* create our tty port */
1022 ret = ifx_spi_create_port(ifx_dev);
1023 if (ret != 0) {
1024 dev_err(&spi->dev, "create default tty port failed");
1025 goto error_ret;
1026 }
1027
1028 pl_data = (struct ifx_modem_platform_data *)spi->dev.platform_data;
1029 if (pl_data) {
1030 ifx_dev->gpio.reset = pl_data->rst_pmu;
1031 ifx_dev->gpio.po = pl_data->pwr_on;
1032 ifx_dev->gpio.mrdy = pl_data->mrdy;
1033 ifx_dev->gpio.srdy = pl_data->srdy;
1034 ifx_dev->gpio.reset_out = pl_data->rst_out;
1035 } else {
1036 dev_err(&spi->dev, "missing platform data!");
1037 ret = -ENODEV;
1038 goto error_ret;
1039 }
1040
1041 dev_info(&spi->dev, "gpios %d, %d, %d, %d, %d",
1042 ifx_dev->gpio.reset, ifx_dev->gpio.po, ifx_dev->gpio.mrdy,
1043 ifx_dev->gpio.srdy, ifx_dev->gpio.reset_out);
1044
1045 /* Configure gpios */
1046 ret = gpio_request(ifx_dev->gpio.reset, "ifxModem");
1047 if (ret < 0) {
1048 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET)",
1049 ifx_dev->gpio.reset);
1050 goto error_ret;
1051 }
1052 ret += gpio_direction_output(ifx_dev->gpio.reset, 0);
1053 ret += gpio_export(ifx_dev->gpio.reset, 1);
1054 if (ret) {
1055 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET)",
1056 ifx_dev->gpio.reset);
1057 ret = -EBUSY;
1058 goto error_ret2;
1059 }
1060
1061 ret = gpio_request(ifx_dev->gpio.po, "ifxModem");
1062 ret += gpio_direction_output(ifx_dev->gpio.po, 0);
1063 ret += gpio_export(ifx_dev->gpio.po, 1);
1064 if (ret) {
1065 dev_err(&spi->dev, "Unable to configure GPIO%d (ON)",
1066 ifx_dev->gpio.po);
1067 ret = -EBUSY;
1068 goto error_ret3;
1069 }
1070
1071 ret = gpio_request(ifx_dev->gpio.mrdy, "ifxModem");
1072 if (ret < 0) {
1073 dev_err(&spi->dev, "Unable to allocate GPIO%d (MRDY)",
1074 ifx_dev->gpio.mrdy);
1075 goto error_ret3;
1076 }
1077 ret += gpio_export(ifx_dev->gpio.mrdy, 1);
1078 ret += gpio_direction_output(ifx_dev->gpio.mrdy, 0);
1079 if (ret) {
1080 dev_err(&spi->dev, "Unable to configure GPIO%d (MRDY)",
1081 ifx_dev->gpio.mrdy);
1082 ret = -EBUSY;
1083 goto error_ret4;
1084 }
1085
1086 ret = gpio_request(ifx_dev->gpio.srdy, "ifxModem");
1087 if (ret < 0) {
1088 dev_err(&spi->dev, "Unable to allocate GPIO%d (SRDY)",
1089 ifx_dev->gpio.srdy);
1090 ret = -EBUSY;
1091 goto error_ret4;
1092 }
1093 ret += gpio_export(ifx_dev->gpio.srdy, 1);
1094 ret += gpio_direction_input(ifx_dev->gpio.srdy);
1095 if (ret) {
1096 dev_err(&spi->dev, "Unable to configure GPIO%d (SRDY)",
1097 ifx_dev->gpio.srdy);
1098 ret = -EBUSY;
1099 goto error_ret5;
1100 }
1101
1102 ret = gpio_request(ifx_dev->gpio.reset_out, "ifxModem");
1103 if (ret < 0) {
1104 dev_err(&spi->dev, "Unable to allocate GPIO%d (RESET_OUT)",
1105 ifx_dev->gpio.reset_out);
1106 goto error_ret5;
1107 }
1108 ret += gpio_export(ifx_dev->gpio.reset_out, 1);
1109 ret += gpio_direction_input(ifx_dev->gpio.reset_out);
1110 if (ret) {
1111 dev_err(&spi->dev, "Unable to configure GPIO%d (RESET_OUT)",
1112 ifx_dev->gpio.reset_out);
1113 ret = -EBUSY;
1114 goto error_ret6;
1115 }
1116
1117 ret = request_irq(gpio_to_irq(ifx_dev->gpio.reset_out),
1118 ifx_spi_reset_interrupt,
1119 IRQF_TRIGGER_RISING|IRQF_TRIGGER_FALLING, DRVNAME,
1120 (void *)ifx_dev);
1121 if (ret) {
1122 dev_err(&spi->dev, "Unable to get irq %x\n",
1123 gpio_to_irq(ifx_dev->gpio.reset_out));
1124 goto error_ret6;
1125 }
1126
1127 ret = ifx_spi_reset(ifx_dev);
1128
1129 ret = request_irq(gpio_to_irq(ifx_dev->gpio.srdy),
1130 ifx_spi_srdy_interrupt,
1131 IRQF_TRIGGER_RISING, DRVNAME,
1132 (void *)ifx_dev);
1133 if (ret) {
1134 dev_err(&spi->dev, "Unable to get irq %x",
1135 gpio_to_irq(ifx_dev->gpio.srdy));
1136 goto error_ret6;
1137 }
1138
1139 /* set pm runtime power state and register with power system */
1140 pm_runtime_set_active(&spi->dev);
1141 pm_runtime_enable(&spi->dev);
1142
1143 /* handle case that modem is already signaling SRDY */
1144 /* no outgoing tty open at this point, this just satisfies the
1145 * modem's read and should reset communication properly
1146 */
1147 srdy = gpio_get_value(ifx_dev->gpio.srdy);
1148
1149 if (srdy) {
1150 mrdy_assert(ifx_dev);
1151 ifx_spi_handle_srdy(ifx_dev);
1152 } else
1153 mrdy_set_low(ifx_dev);
1154 return 0;
1155
1156error_ret6:
1157 gpio_free(ifx_dev->gpio.srdy);
1158error_ret5:
1159 gpio_free(ifx_dev->gpio.mrdy);
1160error_ret4:
1161 gpio_free(ifx_dev->gpio.reset);
1162error_ret3:
1163 gpio_free(ifx_dev->gpio.po);
1164error_ret2:
1165 gpio_free(ifx_dev->gpio.reset_out);
1166error_ret:
1167 ifx_spi_free_device(ifx_dev);
1168 saved_ifx_dev = NULL;
1169 return ret;
1170}
1171
1172/**
1173 * ifx_spi_spi_remove - SPI device was removed
1174 * @spi: SPI device
1175 *
1176 * FIXME: We should be shutting the device down here not in
1177 * the module unload path.
1178 */
1179
1180static int ifx_spi_spi_remove(struct spi_device *spi)
1181{
1182 struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1183 /* stop activity */
1184 tasklet_kill(&ifx_dev->io_work_tasklet);
1185 /* free irq */
1186 free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), (void *)ifx_dev);
1187 free_irq(gpio_to_irq(ifx_dev->gpio.srdy), (void *)ifx_dev);
1188
1189 gpio_free(ifx_dev->gpio.srdy);
1190 gpio_free(ifx_dev->gpio.mrdy);
1191 gpio_free(ifx_dev->gpio.reset);
1192 gpio_free(ifx_dev->gpio.po);
1193 gpio_free(ifx_dev->gpio.reset_out);
1194
1195 /* free allocations */
1196 ifx_spi_free_device(ifx_dev);
1197
1198 saved_ifx_dev = NULL;
1199 return 0;
1200}
1201
1202/**
1203 * ifx_spi_spi_shutdown - called on SPI shutdown
1204 * @spi: SPI device
1205 *
1206 * No action needs to be taken here
1207 */
1208
1209static void ifx_spi_spi_shutdown(struct spi_device *spi)
1210{
1211}
1212
1213/*
1214 * various suspends and resumes have nothing to do
1215 * no hardware to save state for
1216 */
1217
1218/**
1219 * ifx_spi_spi_suspend - suspend SPI on system suspend
1220 * @dev: device being suspended
1221 *
1222 * Suspend the SPI side. No action needed on Intel MID platforms, may
1223 * need extending for other systems.
1224 */
1225static int ifx_spi_spi_suspend(struct spi_device *spi, pm_message_t msg)
1226{
1227 return 0;
1228}
1229
1230/**
1231 * ifx_spi_spi_resume - resume SPI side on system resume
1232 * @dev: device being suspended
1233 *
1234 * Suspend the SPI side. No action needed on Intel MID platforms, may
1235 * need extending for other systems.
1236 */
1237static int ifx_spi_spi_resume(struct spi_device *spi)
1238{
1239 return 0;
1240}
1241
1242/**
1243 * ifx_spi_pm_suspend - suspend modem on system suspend
1244 * @dev: device being suspended
1245 *
1246 * Suspend the modem. No action needed on Intel MID platforms, may
1247 * need extending for other systems.
1248 */
1249static int ifx_spi_pm_suspend(struct device *dev)
1250{
1251 return 0;
1252}
1253
1254/**
1255 * ifx_spi_pm_resume - resume modem on system resume
1256 * @dev: device being suspended
1257 *
1258 * Allow the modem to resume. No action needed.
1259 *
1260 * FIXME: do we need to reset anything here ?
1261 */
1262static int ifx_spi_pm_resume(struct device *dev)
1263{
1264 return 0;
1265}
1266
1267/**
1268 * ifx_spi_pm_runtime_resume - suspend modem
1269 * @dev: device being suspended
1270 *
1271 * Allow the modem to resume. No action needed.
1272 */
1273static int ifx_spi_pm_runtime_resume(struct device *dev)
1274{
1275 return 0;
1276}
1277
1278/**
1279 * ifx_spi_pm_runtime_suspend - suspend modem
1280 * @dev: device being suspended
1281 *
1282 * Allow the modem to suspend and thus suspend to continue up the
1283 * device tree.
1284 */
1285static int ifx_spi_pm_runtime_suspend(struct device *dev)
1286{
1287 return 0;
1288}
1289
1290/**
1291 * ifx_spi_pm_runtime_idle - check if modem idle
1292 * @dev: our device
1293 *
1294 * Check conditions and queue runtime suspend if idle.
1295 */
1296static int ifx_spi_pm_runtime_idle(struct device *dev)
1297{
1298 struct spi_device *spi = to_spi_device(dev);
1299 struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
1300
1301 if (!ifx_dev->power_status)
1302 pm_runtime_suspend(dev);
1303
1304 return 0;
1305}
1306
1307static const struct dev_pm_ops ifx_spi_pm = {
1308 .resume = ifx_spi_pm_resume,
1309 .suspend = ifx_spi_pm_suspend,
1310 .runtime_resume = ifx_spi_pm_runtime_resume,
1311 .runtime_suspend = ifx_spi_pm_runtime_suspend,
1312 .runtime_idle = ifx_spi_pm_runtime_idle
1313};
1314
1315static const struct spi_device_id ifx_id_table[] = {
1316 {"ifx6160", 0},
1317 {"ifx6260", 0},
1318 { }
1319};
1320MODULE_DEVICE_TABLE(spi, ifx_id_table);
1321
1322/* spi operations */
1323static const struct spi_driver ifx_spi_driver_6160 = {
1324 .driver = {
1325 .name = "ifx6160",
1326 .bus = &spi_bus_type,
1327 .pm = &ifx_spi_pm,
1328 .owner = THIS_MODULE},
1329 .probe = ifx_spi_spi_probe,
1330 .shutdown = ifx_spi_spi_shutdown,
1331 .remove = __devexit_p(ifx_spi_spi_remove),
1332 .suspend = ifx_spi_spi_suspend,
1333 .resume = ifx_spi_spi_resume,
1334 .id_table = ifx_id_table
1335};
1336
1337/**
1338 * ifx_spi_exit - module exit
1339 *
1340 * Unload the module.
1341 */
1342
1343static void __exit ifx_spi_exit(void)
1344{
1345 /* unregister */
1346 tty_unregister_driver(tty_drv);
1347 spi_unregister_driver((void *)&ifx_spi_driver_6160);
1348}
1349
1350/**
1351 * ifx_spi_init - module entry point
1352 *
1353 * Initialise the SPI and tty interfaces for the IFX SPI driver
1354 * We need to initialize upper-edge spi driver after the tty
1355 * driver because otherwise the spi probe will race
1356 */
1357
1358static int __init ifx_spi_init(void)
1359{
1360 int result;
1361
1362 tty_drv = alloc_tty_driver(1);
1363 if (!tty_drv) {
1364 pr_err("%s: alloc_tty_driver failed", DRVNAME);
1365 return -ENOMEM;
1366 }
1367
1368 tty_drv->magic = TTY_DRIVER_MAGIC;
1369 tty_drv->owner = THIS_MODULE;
1370 tty_drv->driver_name = DRVNAME;
1371 tty_drv->name = TTYNAME;
1372 tty_drv->minor_start = IFX_SPI_TTY_ID;
1373 tty_drv->num = 1;
1374 tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
1375 tty_drv->subtype = SERIAL_TYPE_NORMAL;
1376 tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
1377 tty_drv->init_termios = tty_std_termios;
1378
1379 tty_set_operations(tty_drv, &ifx_spi_serial_ops);
1380
1381 result = tty_register_driver(tty_drv);
1382 if (result) {
1383 pr_err("%s: tty_register_driver failed(%d)",
1384 DRVNAME, result);
1385 return result;
1386 }
1387
1388 result = spi_register_driver((void *)&ifx_spi_driver_6160);
1389 if (result) {
1390 pr_err("%s: spi_register_driver failed(%d)",
1391 DRVNAME, result);
1392 tty_unregister_driver(tty_drv);
1393 }
1394 return result;
1395}
1396
1397module_init(ifx_spi_init);
1398module_exit(ifx_spi_exit);
1399
1400MODULE_AUTHOR("Intel");
1401MODULE_DESCRIPTION("IFX6x60 spi driver");
1402MODULE_LICENSE("GPL");
1403MODULE_INFO(Version, "0.1-IFX6x60");
kernel source for telekom puls (alcatel/mediatek)