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[net-next-2.6.git] / drivers / input / touchscreen / wm97xx-core.c
CommitLineData
febf1dff
MB		 1/*
2 * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712
3 * and WM9713 AC97 Codecs.
4 *
5 * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
b8d055a8 6 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
febf1dff
MB		 7 * Parts Copyright : Ian Molton <spyro@f2s.com>
8 * Andrew Zabolotny <zap@homelink.ru>
9 * Russell King <rmk@arm.linux.org.uk>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 *
16 * Notes:
17 *
18 * Features:
19 * - supports WM9705, WM9712, WM9713
20 * - polling mode
21 * - continuous mode (arch-dependent)
22 * - adjustable rpu/dpp settings
23 * - adjustable pressure current
24 * - adjustable sample settle delay
25 * - 4 and 5 wire touchscreens (5 wire is WM9712 only)
26 * - pen down detection
27 * - battery monitor
28 * - sample AUX adcs
29 * - power management
30 * - codec GPIO
31 * - codec event notification
32 * Todo
33 * - Support for async sampling control for noisy LCDs.
34 *
35 */
36
37#include <linux/module.h>
38#include <linux/moduleparam.h>
febf1dff
MB		 39#include <linux/kernel.h>
40#include <linux/init.h>
41#include <linux/delay.h>
42#include <linux/string.h>
43#include <linux/proc_fs.h>
44#include <linux/pm.h>
45#include <linux/interrupt.h>
46#include <linux/bitops.h>
47#include <linux/workqueue.h>
48#include <linux/wm97xx.h>
49#include <linux/uaccess.h>
50#include <linux/io.h>
5a0e3ad6 51#include <linux/slab.h>
febf1dff
MB		 52
53#define TS_NAME "wm97xx"
54#define WM_CORE_VERSION "1.00"
55#define DEFAULT_PRESSURE 0xb0c0
56
57
58/*
59 * Touchscreen absolute values
60 *
61 * These parameters are used to help the input layer discard out of
62 * range readings and reduce jitter etc.
63 *
64 * o min, max:- indicate the min and max values your touch screen returns
65 * o fuzz:- use a higher number to reduce jitter
66 *
67 * The default values correspond to Mainstone II in QVGA mode
68 *
69 * Please read
70 * Documentation/input/input-programming.txt for more details.
71 */
72
73static int abs_x[3] = {350, 3900, 5};
74module_param_array(abs_x, int, NULL, 0);
75MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
76
77static int abs_y[3] = {320, 3750, 40};
78module_param_array(abs_y, int, NULL, 0);
79MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
80
81static int abs_p[3] = {0, 150, 4};
82module_param_array(abs_p, int, NULL, 0);
83MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
84
85/*
86 * wm97xx IO access, all IO locking done by AC97 layer
87 */
88int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
89{
90 if (wm->ac97)
91 return wm->ac97->bus->ops->read(wm->ac97, reg);
92 else
93 return -1;
94}
95EXPORT_SYMBOL_GPL(wm97xx_reg_read);
96
97void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
98{
99 /* cache digitiser registers */
100 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
101 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
102
103 /* cache gpio regs */
104 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
105 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
106
107 /* wm9713 irq reg */
108 if (reg == 0x5a)
109 wm->misc = val;
110
111 if (wm->ac97)
112 wm->ac97->bus->ops->write(wm->ac97, reg, val);
113}
114EXPORT_SYMBOL_GPL(wm97xx_reg_write);
115
116/**
117 * wm97xx_read_aux_adc - Read the aux adc.
118 * @wm: wm97xx device.
119 * @adcsel: codec ADC to be read
120 *
121 * Reads the selected AUX ADC.
122 */
123
124int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
125{
126 int power_adc = 0, auxval;
127 u16 power = 0;
eb54ddd4
EM		 128 int rc = 0;
129 int timeout = 0;
febf1dff
MB		 130
131 /* get codec */
132 mutex_lock(&wm->codec_mutex);
133
134 /* When the touchscreen is not in use, we may have to power up
135 * the AUX ADC before we can use sample the AUX inputs->
136 */
137 if (wm->id == WM9713_ID2 &&
138 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
139 power_adc = 1;
140 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
141 }
142
143 /* Prepare the codec for AUX reading */
144 wm->codec->aux_prepare(wm);
145
146 /* Turn polling mode on to read AUX ADC */
147 wm->pen_probably_down = 1;
eb54ddd4
EM		 148
149 while (rc != RC_VALID && timeout++ < 5)
150 rc = wm->codec->poll_sample(wm, adcsel, &auxval);
febf1dff
MB		 151
152 if (power_adc)
153 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
154
155 wm->codec->dig_restore(wm);
156
157 wm->pen_probably_down = 0;
158
eb54ddd4
EM		 159 if (timeout >= 5) {
160 dev_err(wm->dev,
161 "timeout reading auxadc %d, disabling digitiser\n",
162 adcsel);
163 wm->codec->dig_enable(wm, false);
164 }
165
febf1dff 166 mutex_unlock(&wm->codec_mutex);
eb54ddd4 167 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
febf1dff
MB		 168}
169EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
170
171/**
172 * wm97xx_get_gpio - Get the status of a codec GPIO.
173 * @wm: wm97xx device.
174 * @gpio: gpio
175 *
176 * Get the status of a codec GPIO pin
177 */
178
179enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
180{
181 u16 status;
182 enum wm97xx_gpio_status ret;
183
184 mutex_lock(&wm->codec_mutex);
185 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
186
187 if (status & gpio)
188 ret = WM97XX_GPIO_HIGH;
189 else
190 ret = WM97XX_GPIO_LOW;
191
192 mutex_unlock(&wm->codec_mutex);
193 return ret;
194}
195EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
196
197/**
198 * wm97xx_set_gpio - Set the status of a codec GPIO.
199 * @wm: wm97xx device.
200 * @gpio: gpio
201 *
202 *
203 * Set the status of a codec GPIO pin
204 */
205
206void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
207 enum wm97xx_gpio_status status)
208{
209 u16 reg;
210
211 mutex_lock(&wm->codec_mutex);
212 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
213
af8b01b0 214 if (status == WM97XX_GPIO_HIGH)
febf1dff
MB		 215 reg |= gpio;
216 else
217 reg &= ~gpio;
218
99fde513 219 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
febf1dff
MB		 220 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
221 else
222 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
223 mutex_unlock(&wm->codec_mutex);
224}
225EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
226
227/*
228 * Codec GPIO pin configuration, this sets pin direction, polarity,
229 * stickyness and wake up.
230 */
231void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
232 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
233 enum wm97xx_gpio_wake wake)
234{
235 u16 reg;
236
237 mutex_lock(&wm->codec_mutex);
238 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
239
240 if (pol == WM97XX_GPIO_POL_HIGH)
241 reg |= gpio;
242 else
243 reg &= ~gpio;
244
245 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
246 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
247
248 if (sticky == WM97XX_GPIO_STICKY)
249 reg |= gpio;
250 else
251 reg &= ~gpio;
252
253 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
254 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
255
256 if (wake == WM97XX_GPIO_WAKE)
257 reg |= gpio;
258 else
259 reg &= ~gpio;
260
261 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
262 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
263
264 if (dir == WM97XX_GPIO_IN)
265 reg |= gpio;
266 else
267 reg &= ~gpio;
268
269 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
270 mutex_unlock(&wm->codec_mutex);
271}
272EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
273
34d27853
MB		 274/*
275 * Configure the WM97XX_PRP value to use while system is suspended.
276 * If a value other than 0 is set then WM97xx pen detection will be
277 * left enabled in the configured mode while the system is in suspend,
278 * the device has users and suspend has not been disabled via the
279 * wakeup sysfs entries.
280 *
281 * @wm: WM97xx device to configure
282 * @mode: WM97XX_PRP value to configure while suspended
283 */
284void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
285{
286 wm->suspend_mode = mode;
287 device_init_wakeup(&wm->input_dev->dev, mode != 0);
288}
289EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
290
febf1dff
MB		 291/*
292 * Handle a pen down interrupt.
293 */
294static void wm97xx_pen_irq_worker(struct work_struct *work)
295{
296 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
297 int pen_was_down = wm->pen_is_down;
298
299 /* do we need to enable the touch panel reader */
300 if (wm->id == WM9705_ID2) {
301 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
302 WM97XX_PEN_DOWN)
303 wm->pen_is_down = 1;
304 else
305 wm->pen_is_down = 0;
306 } else {
307 u16 status, pol;
308 mutex_lock(&wm->codec_mutex);
309 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
310 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
311
312 if (WM97XX_GPIO_13 & pol & status) {
313 wm->pen_is_down = 1;
314 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
315 ~WM97XX_GPIO_13);
316 } else {
317 wm->pen_is_down = 0;
318 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
319 WM97XX_GPIO_13);
320 }
321
99fde513 322 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
febf1dff
MB		 323 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
324 ~WM97XX_GPIO_13) << 1);
325 else
326 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
327 ~WM97XX_GPIO_13);
328 mutex_unlock(&wm->codec_mutex);
329 }
330
331 /* If the system is not using continuous mode or it provides a
332 * pen down operation then we need to schedule polls while the
333 * pen is down. Otherwise the machine driver is responsible
334 * for scheduling reads.
335 */
336 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
337 if (wm->pen_is_down && !pen_was_down) {
338 /* Data is not availiable immediately on pen down */
339 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
340 }
341
342 /* Let ts_reader report the pen up for debounce. */
343 if (!wm->pen_is_down && pen_was_down)
344 wm->pen_is_down = 1;
345 }
346
347 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
348 wm->mach_ops->acc_pen_up(wm);
349
350 wm->mach_ops->irq_enable(wm, 1);
351}
352
353/*
354 * Codec PENDOWN irq handler
355 *
356 * We have to disable the codec interrupt in the handler because it
357 * can take upto 1ms to clear the interrupt source. We schedule a task
d808fbe5
MB		 358 * in a work queue to do the actual interaction with the chip. The
359 * interrupt is then enabled again in the slow handler when the source
360 * has been cleared.
febf1dff
MB		 361 */
362static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
363{
364 struct wm97xx *wm = dev_id;
365
d808fbe5
MB		 366 if (!work_pending(&wm->pen_event_work)) {
367 wm->mach_ops->irq_enable(wm, 0);
368 queue_work(wm->ts_workq, &wm->pen_event_work);
369 }
febf1dff
MB		 370
371 return IRQ_HANDLED;
372}
373
374/*
375 * initialise pen IRQ handler and workqueue
376 */
377static int wm97xx_init_pen_irq(struct wm97xx *wm)
378{
379 u16 reg;
380
381 /* If an interrupt is supplied an IRQ enable operation must also be
382 * provided. */
383 BUG_ON(!wm->mach_ops->irq_enable);
384
4f295232 385 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
febf1dff
MB		 386 "wm97xx-pen", wm)) {
387 dev_err(wm->dev,
388 "Failed to register pen down interrupt, polling");
389 wm->pen_irq = 0;
390 return -EINVAL;
391 }
392
393 /* Configure GPIO as interrupt source on WM971x */
394 if (wm->id != WM9705_ID2) {
395 BUG_ON(!wm->mach_ops->irq_gpio);
396 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
397 wm97xx_reg_write(wm, AC97_MISC_AFE,
398 reg & ~(wm->mach_ops->irq_gpio));
399 reg = wm97xx_reg_read(wm, 0x5a);
400 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
401 }
402
403 return 0;
404}
405
406static int wm97xx_read_samples(struct wm97xx *wm)
407{
408 struct wm97xx_data data;
409 int rc;
410
411 mutex_lock(&wm->codec_mutex);
412
413 if (wm->mach_ops && wm->mach_ops->acc_enabled)
414 rc = wm->mach_ops->acc_pen_down(wm);
415 else
416 rc = wm->codec->poll_touch(wm, &data);
417
418 if (rc & RC_PENUP) {
419 if (wm->pen_is_down) {
420 wm->pen_is_down = 0;
421 dev_dbg(wm->dev, "pen up\n");
422 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
65db86ac 423 input_report_key(wm->input_dev, BTN_TOUCH, 0);
febf1dff
MB		 424 input_sync(wm->input_dev);
425 } else if (!(rc & RC_AGAIN)) {
426 /* We need high frequency updates only while
427 * pen is down, the user never will be able to
428 * touch screen faster than a few times per
429 * second... On the other hand, when the user
430 * is actively working with the touchscreen we
431 * don't want to lose the quick response. So we
432 * will slowly increase sleep time after the
433 * pen is up and quicky restore it to ~one task
434 * switch when pen is down again.
435 */
436 if (wm->ts_reader_interval < HZ / 10)
437 wm->ts_reader_interval++;
438 }
439
440 } else if (rc & RC_VALID) {
441 dev_dbg(wm->dev,
442 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
443 data.x >> 12, data.x & 0xfff, data.y >> 12,
444 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
445 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
446 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
447 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
65db86ac 448 input_report_key(wm->input_dev, BTN_TOUCH, 1);
febf1dff
MB		 449 input_sync(wm->input_dev);
450 wm->pen_is_down = 1;
451 wm->ts_reader_interval = wm->ts_reader_min_interval;
452 } else if (rc & RC_PENDOWN) {
453 dev_dbg(wm->dev, "pen down\n");
454 wm->pen_is_down = 1;
455 wm->ts_reader_interval = wm->ts_reader_min_interval;
456 }
457
458 mutex_unlock(&wm->codec_mutex);
459 return rc;
460}
461
462/*
463* The touchscreen sample reader.
464*/
465static void wm97xx_ts_reader(struct work_struct *work)
466{
467 int rc;
468 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
469
470 BUG_ON(!wm->codec);
471
472 do {
473 rc = wm97xx_read_samples(wm);
474 } while (rc & RC_AGAIN);
475
476 if (wm->pen_is_down || !wm->pen_irq)
477 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
478 wm->ts_reader_interval);
479}
480
481/**
482 * wm97xx_ts_input_open - Open the touch screen input device.
483 * @idev: Input device to be opened.
484 *
485 * Called by the input sub system to open a wm97xx touchscreen device.
486 * Starts the touchscreen thread and touch digitiser.
487 */
488static int wm97xx_ts_input_open(struct input_dev *idev)
489{
490 struct wm97xx *wm = input_get_drvdata(idev);
491
492 wm->ts_workq = create_singlethread_workqueue("kwm97xx");
493 if (wm->ts_workq == NULL) {
494 dev_err(wm->dev,
495 "Failed to create workqueue\n");
496 return -EINVAL;
497 }
498
499 /* start digitiser */
500 if (wm->mach_ops && wm->mach_ops->acc_enabled)
501 wm->codec->acc_enable(wm, 1);
502 wm->codec->dig_enable(wm, 1);
503
504 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
505 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
506
507 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
508 if (wm->ts_reader_min_interval < 1)
509 wm->ts_reader_min_interval = 1;
510 wm->ts_reader_interval = wm->ts_reader_min_interval;
511
512 wm->pen_is_down = 0;
513 if (wm->pen_irq)
514 wm97xx_init_pen_irq(wm);
515 else
516 dev_err(wm->dev, "No IRQ specified\n");
517
518 /* If we either don't have an interrupt for pen down events or
519 * failed to acquire it then we need to poll.
520 */
521 if (wm->pen_irq == 0)
522 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
523 wm->ts_reader_interval);
524
525 return 0;
526}
527
528/**
529 * wm97xx_ts_input_close - Close the touch screen input device.
530 * @idev: Input device to be closed.
531 *
532 * Called by the input sub system to close a wm97xx touchscreen
533 * device. Kills the touchscreen thread and stops the touch
534 * digitiser.
535 */
536
537static void wm97xx_ts_input_close(struct input_dev *idev)
538{
539 struct wm97xx *wm = input_get_drvdata(idev);
540 u16 reg;
541
542 if (wm->pen_irq) {
543 /* Return the interrupt to GPIO usage (disabling it) */
544 if (wm->id != WM9705_ID2) {
545 BUG_ON(!wm->mach_ops->irq_gpio);
546 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
547 wm97xx_reg_write(wm, AC97_MISC_AFE,
548 reg | wm->mach_ops->irq_gpio);
549 }
550
551 free_irq(wm->pen_irq, wm);
552 }
553
554 wm->pen_is_down = 0;
555
556 /* Balance out interrupt disables/enables */
557 if (cancel_work_sync(&wm->pen_event_work))
558 wm->mach_ops->irq_enable(wm, 1);
559
560 /* ts_reader rearms itself so we need to explicitly stop it
561 * before we destroy the workqueue.
562 */
563 cancel_delayed_work_sync(&wm->ts_reader);
564
565 destroy_workqueue(wm->ts_workq);
566
567 /* stop digitiser */
568 wm->codec->dig_enable(wm, 0);
569 if (wm->mach_ops && wm->mach_ops->acc_enabled)
570 wm->codec->acc_enable(wm, 0);
571}
572
573static int wm97xx_probe(struct device *dev)
574{
575 struct wm97xx *wm;
32bb0e0c 576 struct wm97xx_pdata *pdata = dev->platform_data;
febf1dff
MB		 577 int ret = 0, id = 0;
578
579 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
580 if (!wm)
581 return -ENOMEM;
582 mutex_init(&wm->codec_mutex);
583
584 wm->dev = dev;
017596b6 585 dev_set_drvdata(dev, wm);
febf1dff
MB		 586 wm->ac97 = to_ac97_t(dev);
587
588 /* check that we have a supported codec */
589 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
590 if (id != WM97XX_ID1) {
591 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
592 ret = -ENODEV;
593 goto alloc_err;
594 }
595
596 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
597
99fde513
MV		 598 wm->variant = WM97xx_GENERIC;
599
febf1dff
MB		 600 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
601
602 switch (wm->id & 0xff) {
603#ifdef CONFIG_TOUCHSCREEN_WM9705
604 case 0x05:
605 wm->codec = &wm9705_codec;
606 break;
607#endif
608#ifdef CONFIG_TOUCHSCREEN_WM9712
609 case 0x12:
610 wm->codec = &wm9712_codec;
611 break;
612#endif
613#ifdef CONFIG_TOUCHSCREEN_WM9713
614 case 0x13:
615 wm->codec = &wm9713_codec;
616 break;
617#endif
618 default:
619 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
620 wm->id & 0xff);
621 ret = -ENODEV;
622 goto alloc_err;
623 }
624
5de4cd43
MB		 625 /* set up physical characteristics */
626 wm->codec->phy_init(wm);
627
628 /* load gpio cache */
629 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
630 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
631 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
632 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
633 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
634 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
635
febf1dff
MB		 636 wm->input_dev = input_allocate_device();
637 if (wm->input_dev == NULL) {
638 ret = -ENOMEM;
639 goto alloc_err;
640 }
641
642 /* set up touch configuration */
643 wm->input_dev->name = "wm97xx touchscreen";
6b32ca39 644 wm->input_dev->phys = "wm97xx";
febf1dff
MB		 645 wm->input_dev->open = wm97xx_ts_input_open;
646 wm->input_dev->close = wm97xx_ts_input_close;
65db86ac
MR		 647
648 __set_bit(EV_ABS, wm->input_dev->evbit);
649 __set_bit(EV_KEY, wm->input_dev->evbit);
650 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
651
febf1dff
MB		 652 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
653 abs_x[2], 0);
654 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
655 abs_y[2], 0);
656 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
657 abs_p[2], 0);
65db86ac 658
febf1dff
MB		 659 input_set_drvdata(wm->input_dev, wm);
660 wm->input_dev->dev.parent = dev;
65db86ac 661
febf1dff
MB		 662 ret = input_register_device(wm->input_dev);
663 if (ret < 0)
664 goto dev_alloc_err;
665
febf1dff
MB		 666 /* register our battery device */
667 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
668 if (!wm->battery_dev) {
669 ret = -ENOMEM;
670 goto batt_err;
671 }
672 platform_set_drvdata(wm->battery_dev, wm);
673 wm->battery_dev->dev.parent = dev;
32bb0e0c 674 wm->battery_dev->dev.platform_data = pdata;
febf1dff
MB		 675 ret = platform_device_add(wm->battery_dev);
676 if (ret < 0)
677 goto batt_reg_err;
678
679 /* register our extended touch device (for machine specific
680 * extensions) */
681 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
682 if (!wm->touch_dev) {
683 ret = -ENOMEM;
684 goto touch_err;
685 }
686 platform_set_drvdata(wm->touch_dev, wm);
687 wm->touch_dev->dev.parent = dev;
32bb0e0c 688 wm->touch_dev->dev.platform_data = pdata;
febf1dff
MB		 689 ret = platform_device_add(wm->touch_dev);
690 if (ret < 0)
691 goto touch_reg_err;
692
693 return ret;
694
695 touch_reg_err:
696 platform_device_put(wm->touch_dev);
697 touch_err:
d3622e6f 698 platform_device_del(wm->battery_dev);
febf1dff
MB		 699 batt_reg_err:
700 platform_device_put(wm->battery_dev);
701 batt_err:
702 input_unregister_device(wm->input_dev);
703 wm->input_dev = NULL;
704 dev_alloc_err:
705 input_free_device(wm->input_dev);
706 alloc_err:
707 kfree(wm);
708
709 return ret;
710}
711
712static int wm97xx_remove(struct device *dev)
713{
714 struct wm97xx *wm = dev_get_drvdata(dev);
715
716 platform_device_unregister(wm->battery_dev);
717 platform_device_unregister(wm->touch_dev);
718 input_unregister_device(wm->input_dev);
719 kfree(wm);
720
721 return 0;
722}
723
724#ifdef CONFIG_PM
725static int wm97xx_suspend(struct device *dev, pm_message_t state)
726{
727 struct wm97xx *wm = dev_get_drvdata(dev);
34d27853
MB		 728 u16 reg;
729 int suspend_mode;
730
731 if (device_may_wakeup(&wm->input_dev->dev))
732 suspend_mode = wm->suspend_mode;
733 else
734 suspend_mode = 0;
febf1dff
MB		 735
736 if (wm->input_dev->users)
737 cancel_delayed_work_sync(&wm->ts_reader);
738
34d27853
MB		 739 /* Power down the digitiser (bypassing the cache for resume) */
740 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
741 reg &= ~WM97XX_PRP_DET_DIG;
742 if (wm->input_dev->users)
743 reg |= suspend_mode;
744 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
745
746 /* WM9713 has an additional power bit - turn it off if there
747 * are no users or if suspend mode is zero. */
748 if (wm->id == WM9713_ID2 &&
749 (!wm->input_dev->users || !suspend_mode)) {
750 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
751 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
752 }
753
febf1dff
MB		 754 return 0;
755}
756
757static int wm97xx_resume(struct device *dev)
758{
759 struct wm97xx *wm = dev_get_drvdata(dev);
760
761 /* restore digitiser and gpios */
762 if (wm->id == WM9713_ID2) {
763 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
764 wm97xx_reg_write(wm, 0x5a, wm->misc);
765 if (wm->input_dev->users) {
766 u16 reg;
767 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
768 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
769 }
770 }
771
772 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
773 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
774
775 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
776 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
777 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
778 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
779 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
780 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
781
782 if (wm->input_dev->users && !wm->pen_irq) {
783 wm->ts_reader_interval = wm->ts_reader_min_interval;
784 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
785 wm->ts_reader_interval);
786 }
787
788 return 0;
789}
790
791#else
792#define wm97xx_suspend NULL
793#define wm97xx_resume NULL
794#endif
795
796/*
797 * Machine specific operations
798 */
799int wm97xx_register_mach_ops(struct wm97xx *wm,
800 struct wm97xx_mach_ops *mach_ops)
801{
802 mutex_lock(&wm->codec_mutex);
803 if (wm->mach_ops) {
804 mutex_unlock(&wm->codec_mutex);
805 return -EINVAL;
806 }
807 wm->mach_ops = mach_ops;
808 mutex_unlock(&wm->codec_mutex);
809
810 return 0;
811}
812EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
813
814void wm97xx_unregister_mach_ops(struct wm97xx *wm)
815{
816 mutex_lock(&wm->codec_mutex);
817 wm->mach_ops = NULL;
818 mutex_unlock(&wm->codec_mutex);
819}
820EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
821
822static struct device_driver wm97xx_driver = {
ef9db492 823 .name = "wm97xx-ts",
febf1dff
MB		 824 .bus = &ac97_bus_type,
825 .owner = THIS_MODULE,
826 .probe = wm97xx_probe,
827 .remove = wm97xx_remove,
828 .suspend = wm97xx_suspend,
829 .resume = wm97xx_resume,
830};
831
832static int __init wm97xx_init(void)
833{
834 return driver_register(&wm97xx_driver);
835}
836
837static void __exit wm97xx_exit(void)
838{
839 driver_unregister(&wm97xx_driver);
840}
841
842module_init(wm97xx_init);
843module_exit(wm97xx_exit);
844
845/* Module information */
b8d055a8 846MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
febf1dff
MB		 847MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
848MODULE_LICENSE("GPL");
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