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x86: Move call to print_modules() out of show_regs()
[deliverable/linux.git] / drivers / input / touchscreen / tsc2005.c
1 /*
2 * TSC2005 touchscreen driver
3 *
4 * Copyright (C) 2006-2010 Nokia Corporation
5 *
6 * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
7 * based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/input.h>
28 #include <linux/interrupt.h>
29 #include <linux/delay.h>
30 #include <linux/pm.h>
31 #include <linux/spi/spi.h>
32 #include <linux/spi/tsc2005.h>
33
34 /*
35 * The touchscreen interface operates as follows:
36 *
37 * 1) Pen is pressed against the touchscreen.
38 * 2) TSC2005 performs AD conversion.
39 * 3) After the conversion is done TSC2005 drives DAV line down.
40 * 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
41 * 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
42 * values.
43 * 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
44 * tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
45 * 7) When the penup timer expires, there have not been touch or DAV interrupts
46 * during the last 40ms which means the pen has been lifted.
47 *
48 * ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
49 * after a configurable period (in ms) of activity. If esd_timeout is 0, the
50 * watchdog is disabled.
51 */
52
53 /* control byte 1 */
54 #define TSC2005_CMD 0x80
55 #define TSC2005_CMD_NORMAL 0x00
56 #define TSC2005_CMD_STOP 0x01
57 #define TSC2005_CMD_12BIT 0x04
58
59 /* control byte 0 */
60 #define TSC2005_REG_READ 0x0001
61 #define TSC2005_REG_PND0 0x0002
62 #define TSC2005_REG_X 0x0000
63 #define TSC2005_REG_Y 0x0008
64 #define TSC2005_REG_Z1 0x0010
65 #define TSC2005_REG_Z2 0x0018
66 #define TSC2005_REG_TEMP_HIGH 0x0050
67 #define TSC2005_REG_CFR0 0x0060
68 #define TSC2005_REG_CFR1 0x0068
69 #define TSC2005_REG_CFR2 0x0070
70
71 /* configuration register 0 */
72 #define TSC2005_CFR0_PRECHARGE_276US 0x0040
73 #define TSC2005_CFR0_STABTIME_1MS 0x0300
74 #define TSC2005_CFR0_CLOCK_1MHZ 0x1000
75 #define TSC2005_CFR0_RESOLUTION12 0x2000
76 #define TSC2005_CFR0_PENMODE 0x8000
77 #define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \
78 TSC2005_CFR0_CLOCK_1MHZ | \
79 TSC2005_CFR0_RESOLUTION12 | \
80 TSC2005_CFR0_PRECHARGE_276US | \
81 TSC2005_CFR0_PENMODE)
82
83 /* bits common to both read and write of configuration register 0 */
84 #define TSC2005_CFR0_RW_MASK 0x3fff
85
86 /* configuration register 1 */
87 #define TSC2005_CFR1_BATCHDELAY_4MS 0x0003
88 #define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS
89
90 /* configuration register 2 */
91 #define TSC2005_CFR2_MAVE_Z 0x0004
92 #define TSC2005_CFR2_MAVE_Y 0x0008
93 #define TSC2005_CFR2_MAVE_X 0x0010
94 #define TSC2005_CFR2_AVG_7 0x0800
95 #define TSC2005_CFR2_MEDIUM_15 0x3000
96 #define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \
97 TSC2005_CFR2_MAVE_Y | \
98 TSC2005_CFR2_MAVE_Z | \
99 TSC2005_CFR2_MEDIUM_15 | \
100 TSC2005_CFR2_AVG_7)
101
102 #define MAX_12BIT 0xfff
103 #define TSC2005_SPI_MAX_SPEED_HZ 10000000
104 #define TSC2005_PENUP_TIME_MS 40
105
106 struct tsc2005_spi_rd {
107 struct spi_transfer spi_xfer;
108 u32 spi_tx;
109 u32 spi_rx;
110 };
111
112 struct tsc2005 {
113 struct spi_device *spi;
114
115 struct spi_message spi_read_msg;
116 struct tsc2005_spi_rd spi_x;
117 struct tsc2005_spi_rd spi_y;
118 struct tsc2005_spi_rd spi_z1;
119 struct tsc2005_spi_rd spi_z2;
120
121 struct input_dev *idev;
122 char phys[32];
123
124 struct mutex mutex;
125
126 /* raw copy of previous x,y,z */
127 int in_x;
128 int in_y;
129 int in_z1;
130 int in_z2;
131
132 spinlock_t lock;
133 struct timer_list penup_timer;
134
135 unsigned int esd_timeout;
136 struct delayed_work esd_work;
137 unsigned long last_valid_interrupt;
138
139 unsigned int x_plate_ohm;
140
141 bool opened;
142 bool suspended;
143
144 bool pen_down;
145
146 void (*set_reset)(bool enable);
147 };
148
149 static int tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
150 {
151 u8 tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
152 struct spi_transfer xfer = {
153 .tx_buf = &tx,
154 .len = 1,
155 .bits_per_word = 8,
156 };
157 struct spi_message msg;
158 int error;
159
160 spi_message_init(&msg);
161 spi_message_add_tail(&xfer, &msg);
162
163 error = spi_sync(ts->spi, &msg);
164 if (error) {
165 dev_err(&ts->spi->dev, "%s: failed, command: %x, error: %d\n",
166 __func__, cmd, error);
167 return error;
168 }
169
170 return 0;
171 }
172
173 static int tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
174 {
175 u32 tx = ((reg | TSC2005_REG_PND0) << 16) | value;
176 struct spi_transfer xfer = {
177 .tx_buf = &tx,
178 .len = 4,
179 .bits_per_word = 24,
180 };
181 struct spi_message msg;
182 int error;
183
184 spi_message_init(&msg);
185 spi_message_add_tail(&xfer, &msg);
186
187 error = spi_sync(ts->spi, &msg);
188 if (error) {
189 dev_err(&ts->spi->dev,
190 "%s: failed, register: %x, value: %x, error: %d\n",
191 __func__, reg, value, error);
192 return error;
193 }
194
195 return 0;
196 }
197
198 static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
199 {
200 memset(rd, 0, sizeof(*rd));
201
202 rd->spi_tx = (reg | TSC2005_REG_READ) << 16;
203 rd->spi_xfer.tx_buf = &rd->spi_tx;
204 rd->spi_xfer.rx_buf = &rd->spi_rx;
205 rd->spi_xfer.len = 4;
206 rd->spi_xfer.bits_per_word = 24;
207 rd->spi_xfer.cs_change = !last;
208 }
209
210 static int tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
211 {
212 struct tsc2005_spi_rd spi_rd;
213 struct spi_message msg;
214 int error;
215
216 tsc2005_setup_read(&spi_rd, reg, true);
217
218 spi_message_init(&msg);
219 spi_message_add_tail(&spi_rd.spi_xfer, &msg);
220
221 error = spi_sync(ts->spi, &msg);
222 if (error)
223 return error;
224
225 *value = spi_rd.spi_rx;
226 return 0;
227 }
228
229 static void tsc2005_update_pen_state(struct tsc2005 *ts,
230 int x, int y, int pressure)
231 {
232 if (pressure) {
233 input_report_abs(ts->idev, ABS_X, x);
234 input_report_abs(ts->idev, ABS_Y, y);
235 input_report_abs(ts->idev, ABS_PRESSURE, pressure);
236 if (!ts->pen_down) {
237 input_report_key(ts->idev, BTN_TOUCH, !!pressure);
238 ts->pen_down = true;
239 }
240 } else {
241 input_report_abs(ts->idev, ABS_PRESSURE, 0);
242 if (ts->pen_down) {
243 input_report_key(ts->idev, BTN_TOUCH, 0);
244 ts->pen_down = false;
245 }
246 }
247 input_sync(ts->idev);
248 dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
249 pressure);
250 }
251
252 static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
253 {
254 struct tsc2005 *ts = _ts;
255 unsigned long flags;
256 unsigned int pressure;
257 u32 x, y;
258 u32 z1, z2;
259 int error;
260
261 /* read the coordinates */
262 error = spi_sync(ts->spi, &ts->spi_read_msg);
263 if (unlikely(error))
264 goto out;
265
266 x = ts->spi_x.spi_rx;
267 y = ts->spi_y.spi_rx;
268 z1 = ts->spi_z1.spi_rx;
269 z2 = ts->spi_z2.spi_rx;
270
271 /* validate position */
272 if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
273 goto out;
274
275 /* Skip reading if the pressure components are out of range */
276 if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
277 goto out;
278
279 /*
280 * Skip point if this is a pen down with the exact same values as
281 * the value before pen-up - that implies SPI fed us stale data
282 */
283 if (!ts->pen_down &&
284 ts->in_x == x && ts->in_y == y &&
285 ts->in_z1 == z1 && ts->in_z2 == z2) {
286 goto out;
287 }
288
289 /*
290 * At this point we are happy we have a valid and useful reading.
291 * Remember it for later comparisons. We may now begin downsampling.
292 */
293 ts->in_x = x;
294 ts->in_y = y;
295 ts->in_z1 = z1;
296 ts->in_z2 = z2;
297
298 /* Compute touch pressure resistance using equation #1 */
299 pressure = x * (z2 - z1) / z1;
300 pressure = pressure * ts->x_plate_ohm / 4096;
301 if (unlikely(pressure > MAX_12BIT))
302 goto out;
303
304 spin_lock_irqsave(&ts->lock, flags);
305
306 tsc2005_update_pen_state(ts, x, y, pressure);
307 mod_timer(&ts->penup_timer,
308 jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
309
310 spin_unlock_irqrestore(&ts->lock, flags);
311
312 ts->last_valid_interrupt = jiffies;
313 out:
314 return IRQ_HANDLED;
315 }
316
317 static void tsc2005_penup_timer(unsigned long data)
318 {
319 struct tsc2005 *ts = (struct tsc2005 *)data;
320 unsigned long flags;
321
322 spin_lock_irqsave(&ts->lock, flags);
323 tsc2005_update_pen_state(ts, 0, 0, 0);
324 spin_unlock_irqrestore(&ts->lock, flags);
325 }
326
327 static void tsc2005_start_scan(struct tsc2005 *ts)
328 {
329 tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
330 tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
331 tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
332 tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
333 }
334
335 static void tsc2005_stop_scan(struct tsc2005 *ts)
336 {
337 tsc2005_cmd(ts, TSC2005_CMD_STOP);
338 }
339
340 /* must be called with ts->mutex held */
341 static void __tsc2005_disable(struct tsc2005 *ts)
342 {
343 tsc2005_stop_scan(ts);
344
345 disable_irq(ts->spi->irq);
346 del_timer_sync(&ts->penup_timer);
347
348 cancel_delayed_work_sync(&ts->esd_work);
349
350 enable_irq(ts->spi->irq);
351 }
352
353 /* must be called with ts->mutex held */
354 static void __tsc2005_enable(struct tsc2005 *ts)
355 {
356 tsc2005_start_scan(ts);
357
358 if (ts->esd_timeout && ts->set_reset) {
359 ts->last_valid_interrupt = jiffies;
360 schedule_delayed_work(&ts->esd_work,
361 round_jiffies_relative(
362 msecs_to_jiffies(ts->esd_timeout)));
363 }
364
365 }
366
367 static ssize_t tsc2005_selftest_show(struct device *dev,
368 struct device_attribute *attr,
369 char *buf)
370 {
371 struct spi_device *spi = to_spi_device(dev);
372 struct tsc2005 *ts = spi_get_drvdata(spi);
373 u16 temp_high;
374 u16 temp_high_orig;
375 u16 temp_high_test;
376 bool success = true;
377 int error;
378
379 mutex_lock(&ts->mutex);
380
381 /*
382 * Test TSC2005 communications via temp high register.
383 */
384 __tsc2005_disable(ts);
385
386 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
387 if (error) {
388 dev_warn(dev, "selftest failed: read error %d\n", error);
389 success = false;
390 goto out;
391 }
392
393 temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
394
395 error = tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
396 if (error) {
397 dev_warn(dev, "selftest failed: write error %d\n", error);
398 success = false;
399 goto out;
400 }
401
402 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
403 if (error) {
404 dev_warn(dev, "selftest failed: read error %d after write\n",
405 error);
406 success = false;
407 goto out;
408 }
409
410 if (temp_high != temp_high_test) {
411 dev_warn(dev, "selftest failed: %d != %d\n",
412 temp_high, temp_high_test);
413 success = false;
414 }
415
416 /* hardware reset */
417 ts->set_reset(false);
418 usleep_range(100, 500); /* only 10us required */
419 ts->set_reset(true);
420
421 if (!success)
422 goto out;
423
424 /* test that the reset really happened */
425 error = tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
426 if (error) {
427 dev_warn(dev, "selftest failed: read error %d after reset\n",
428 error);
429 success = false;
430 goto out;
431 }
432
433 if (temp_high != temp_high_orig) {
434 dev_warn(dev, "selftest failed after reset: %d != %d\n",
435 temp_high, temp_high_orig);
436 success = false;
437 }
438
439 out:
440 __tsc2005_enable(ts);
441 mutex_unlock(&ts->mutex);
442
443 return sprintf(buf, "%d\n", success);
444 }
445
446 static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
447
448 static struct attribute *tsc2005_attrs[] = {
449 &dev_attr_selftest.attr,
450 NULL
451 };
452
453 static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
454 struct attribute *attr, int n)
455 {
456 struct device *dev = container_of(kobj, struct device, kobj);
457 struct spi_device *spi = to_spi_device(dev);
458 struct tsc2005 *ts = spi_get_drvdata(spi);
459 umode_t mode = attr->mode;
460
461 if (attr == &dev_attr_selftest.attr) {
462 if (!ts->set_reset)
463 mode = 0;
464 }
465
466 return mode;
467 }
468
469 static const struct attribute_group tsc2005_attr_group = {
470 .is_visible = tsc2005_attr_is_visible,
471 .attrs = tsc2005_attrs,
472 };
473
474 static void tsc2005_esd_work(struct work_struct *work)
475 {
476 struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work.work);
477 int error;
478 u16 r;
479
480 if (!mutex_trylock(&ts->mutex)) {
481 /*
482 * If the mutex is taken, it means that disable or enable is in
483 * progress. In that case just reschedule the work. If the work
484 * is not needed, it will be canceled by disable.
485 */
486 goto reschedule;
487 }
488
489 if (time_is_after_jiffies(ts->last_valid_interrupt +
490 msecs_to_jiffies(ts->esd_timeout)))
491 goto out;
492
493 /* We should be able to read register without disabling interrupts. */
494 error = tsc2005_read(ts, TSC2005_REG_CFR0, &r);
495 if (!error &&
496 !((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK)) {
497 goto out;
498 }
499
500 /*
501 * If we could not read our known value from configuration register 0
502 * then we should reset the controller as if from power-up and start
503 * scanning again.
504 */
505 dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
506
507 disable_irq(ts->spi->irq);
508 del_timer_sync(&ts->penup_timer);
509
510 tsc2005_update_pen_state(ts, 0, 0, 0);
511
512 ts->set_reset(false);
513 usleep_range(100, 500); /* only 10us required */
514 ts->set_reset(true);
515
516 enable_irq(ts->spi->irq);
517 tsc2005_start_scan(ts);
518
519 out:
520 mutex_unlock(&ts->mutex);
521 reschedule:
522 /* re-arm the watchdog */
523 schedule_delayed_work(&ts->esd_work,
524 round_jiffies_relative(
525 msecs_to_jiffies(ts->esd_timeout)));
526 }
527
528 static int tsc2005_open(struct input_dev *input)
529 {
530 struct tsc2005 *ts = input_get_drvdata(input);
531
532 mutex_lock(&ts->mutex);
533
534 if (!ts->suspended)
535 __tsc2005_enable(ts);
536
537 ts->opened = true;
538
539 mutex_unlock(&ts->mutex);
540
541 return 0;
542 }
543
544 static void tsc2005_close(struct input_dev *input)
545 {
546 struct tsc2005 *ts = input_get_drvdata(input);
547
548 mutex_lock(&ts->mutex);
549
550 if (!ts->suspended)
551 __tsc2005_disable(ts);
552
553 ts->opened = false;
554
555 mutex_unlock(&ts->mutex);
556 }
557
558 static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
559 {
560 tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, false);
561 tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, false);
562 tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, false);
563 tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, true);
564
565 spi_message_init(&ts->spi_read_msg);
566 spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
567 spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
568 spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
569 spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
570 }
571
572 static int __devinit tsc2005_probe(struct spi_device *spi)
573 {
574 const struct tsc2005_platform_data *pdata = spi->dev.platform_data;
575 struct tsc2005 *ts;
576 struct input_dev *input_dev;
577 unsigned int max_x, max_y, max_p;
578 unsigned int fudge_x, fudge_y, fudge_p;
579 int error;
580
581 if (!pdata) {
582 dev_dbg(&spi->dev, "no platform data\n");
583 return -ENODEV;
584 }
585
586 fudge_x = pdata->ts_x_fudge ? : 4;
587 fudge_y = pdata->ts_y_fudge ? : 8;
588 fudge_p = pdata->ts_pressure_fudge ? : 2;
589 max_x = pdata->ts_x_max ? : MAX_12BIT;
590 max_y = pdata->ts_y_max ? : MAX_12BIT;
591 max_p = pdata->ts_pressure_max ? : MAX_12BIT;
592
593 if (spi->irq <= 0) {
594 dev_dbg(&spi->dev, "no irq\n");
595 return -ENODEV;
596 }
597
598 spi->mode = SPI_MODE_0;
599 spi->bits_per_word = 8;
600 if (!spi->max_speed_hz)
601 spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
602
603 error = spi_setup(spi);
604 if (error)
605 return error;
606
607 ts = kzalloc(sizeof(*ts), GFP_KERNEL);
608 input_dev = input_allocate_device();
609 if (!ts || !input_dev) {
610 error = -ENOMEM;
611 goto err_free_mem;
612 }
613
614 ts->spi = spi;
615 ts->idev = input_dev;
616
617 ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
618 ts->esd_timeout = pdata->esd_timeout_ms;
619 ts->set_reset = pdata->set_reset;
620
621 mutex_init(&ts->mutex);
622
623 spin_lock_init(&ts->lock);
624 setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
625
626 INIT_DELAYED_WORK(&ts->esd_work, tsc2005_esd_work);
627
628 tsc2005_setup_spi_xfer(ts);
629
630 snprintf(ts->phys, sizeof(ts->phys),
631 "%s/input-ts", dev_name(&spi->dev));
632
633 input_dev->name = "TSC2005 touchscreen";
634 input_dev->phys = ts->phys;
635 input_dev->id.bustype = BUS_SPI;
636 input_dev->dev.parent = &spi->dev;
637 input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
638 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
639
640 input_set_abs_params(input_dev, ABS_X, 0, max_x, fudge_x, 0);
641 input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
642 input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
643
644 input_dev->open = tsc2005_open;
645 input_dev->close = tsc2005_close;
646
647 input_set_drvdata(input_dev, ts);
648
649 /* Ensure the touchscreen is off */
650 tsc2005_stop_scan(ts);
651
652 error = request_threaded_irq(spi->irq, NULL, tsc2005_irq_thread,
653 IRQF_TRIGGER_RISING, "tsc2005", ts);
654 if (error) {
655 dev_err(&spi->dev, "Failed to request irq, err: %d\n", error);
656 goto err_free_mem;
657 }
658
659 spi_set_drvdata(spi, ts);
660 error = sysfs_create_group(&spi->dev.kobj, &tsc2005_attr_group);
661 if (error) {
662 dev_err(&spi->dev,
663 "Failed to create sysfs attributes, err: %d\n", error);
664 goto err_clear_drvdata;
665 }
666
667 error = input_register_device(ts->idev);
668 if (error) {
669 dev_err(&spi->dev,
670 "Failed to register input device, err: %d\n", error);
671 goto err_remove_sysfs;
672 }
673
674 irq_set_irq_wake(spi->irq, 1);
675 return 0;
676
677 err_remove_sysfs:
678 sysfs_remove_group(&spi->dev.kobj, &tsc2005_attr_group);
679 err_clear_drvdata:
680 spi_set_drvdata(spi, NULL);
681 free_irq(spi->irq, ts);
682 err_free_mem:
683 input_free_device(input_dev);
684 kfree(ts);
685 return error;
686 }
687
688 static int __devexit tsc2005_remove(struct spi_device *spi)
689 {
690 struct tsc2005 *ts = spi_get_drvdata(spi);
691
692 sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
693
694 free_irq(ts->spi->irq, ts);
695 input_unregister_device(ts->idev);
696 kfree(ts);
697
698 spi_set_drvdata(spi, NULL);
699 return 0;
700 }
701
702 #ifdef CONFIG_PM_SLEEP
703 static int tsc2005_suspend(struct device *dev)
704 {
705 struct spi_device *spi = to_spi_device(dev);
706 struct tsc2005 *ts = spi_get_drvdata(spi);
707
708 mutex_lock(&ts->mutex);
709
710 if (!ts->suspended && ts->opened)
711 __tsc2005_disable(ts);
712
713 ts->suspended = true;
714
715 mutex_unlock(&ts->mutex);
716
717 return 0;
718 }
719
720 static int tsc2005_resume(struct device *dev)
721 {
722 struct spi_device *spi = to_spi_device(dev);
723 struct tsc2005 *ts = spi_get_drvdata(spi);
724
725 mutex_lock(&ts->mutex);
726
727 if (ts->suspended && ts->opened)
728 __tsc2005_enable(ts);
729
730 ts->suspended = false;
731
732 mutex_unlock(&ts->mutex);
733
734 return 0;
735 }
736 #endif
737
738 static SIMPLE_DEV_PM_OPS(tsc2005_pm_ops, tsc2005_suspend, tsc2005_resume);
739
740 static struct spi_driver tsc2005_driver = {
741 .driver = {
742 .name = "tsc2005",
743 .owner = THIS_MODULE,
744 .pm = &tsc2005_pm_ops,
745 },
746 .probe = tsc2005_probe,
747 .remove = __devexit_p(tsc2005_remove),
748 };
749
750 module_spi_driver(tsc2005_driver);
751
752 MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
753 MODULE_DESCRIPTION("TSC2005 Touchscreen Driver");
754 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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