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Input: wm97xx - add possibility to control the GPIO_STATUS shift
[deliverable/linux.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>
51
52#define TS_NAME "wm97xx"
53#define WM_CORE_VERSION "1.00"
54#define DEFAULT_PRESSURE 0xb0c0
55
56
57/*
58 * Touchscreen absolute values
59 *
60 * These parameters are used to help the input layer discard out of
61 * range readings and reduce jitter etc.
62 *
63 * o min, max:- indicate the min and max values your touch screen returns
64 * o fuzz:- use a higher number to reduce jitter
65 *
66 * The default values correspond to Mainstone II in QVGA mode
67 *
68 * Please read
69 * Documentation/input/input-programming.txt for more details.
70 */
71
72static int abs_x[3] = {350, 3900, 5};
73module_param_array(abs_x, int, NULL, 0);
74MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
75
76static int abs_y[3] = {320, 3750, 40};
77module_param_array(abs_y, int, NULL, 0);
78MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
79
80static int abs_p[3] = {0, 150, 4};
81module_param_array(abs_p, int, NULL, 0);
82MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
83
84/*
85 * wm97xx IO access, all IO locking done by AC97 layer
86 */
87int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
88{
89 if (wm->ac97)
90 return wm->ac97->bus->ops->read(wm->ac97, reg);
91 else
92 return -1;
93}
94EXPORT_SYMBOL_GPL(wm97xx_reg_read);
95
96void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
97{
98 /* cache digitiser registers */
99 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
100 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
101
102 /* cache gpio regs */
103 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
104 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
105
106 /* wm9713 irq reg */
107 if (reg == 0x5a)
108 wm->misc = val;
109
110 if (wm->ac97)
111 wm->ac97->bus->ops->write(wm->ac97, reg, val);
112}
113EXPORT_SYMBOL_GPL(wm97xx_reg_write);
114
115/**
116 * wm97xx_read_aux_adc - Read the aux adc.
117 * @wm: wm97xx device.
118 * @adcsel: codec ADC to be read
119 *
120 * Reads the selected AUX ADC.
121 */
122
123int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
124{
125 int power_adc = 0, auxval;
126 u16 power = 0;
127
128 /* get codec */
129 mutex_lock(&wm->codec_mutex);
130
131 /* When the touchscreen is not in use, we may have to power up
132 * the AUX ADC before we can use sample the AUX inputs->
133 */
134 if (wm->id == WM9713_ID2 &&
135 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
136 power_adc = 1;
137 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
138 }
139
140 /* Prepare the codec for AUX reading */
141 wm->codec->aux_prepare(wm);
142
143 /* Turn polling mode on to read AUX ADC */
144 wm->pen_probably_down = 1;
145 wm->codec->poll_sample(wm, adcsel, &auxval);
146
147 if (power_adc)
148 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
149
150 wm->codec->dig_restore(wm);
151
152 wm->pen_probably_down = 0;
153
154 mutex_unlock(&wm->codec_mutex);
155 return auxval & 0xfff;
156}
157EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
158
159/**
160 * wm97xx_get_gpio - Get the status of a codec GPIO.
161 * @wm: wm97xx device.
162 * @gpio: gpio
163 *
164 * Get the status of a codec GPIO pin
165 */
166
167enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
168{
169 u16 status;
170 enum wm97xx_gpio_status ret;
171
172 mutex_lock(&wm->codec_mutex);
173 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
174
175 if (status & gpio)
176 ret = WM97XX_GPIO_HIGH;
177 else
178 ret = WM97XX_GPIO_LOW;
179
180 mutex_unlock(&wm->codec_mutex);
181 return ret;
182}
183EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
184
185/**
186 * wm97xx_set_gpio - Set the status of a codec GPIO.
187 * @wm: wm97xx device.
188 * @gpio: gpio
189 *
190 *
191 * Set the status of a codec GPIO pin
192 */
193
194void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
195 enum wm97xx_gpio_status status)
196{
197 u16 reg;
198
199 mutex_lock(&wm->codec_mutex);
200 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
201
202 if (status & WM97XX_GPIO_HIGH)
203 reg |= gpio;
204 else
205 reg &= ~gpio;
206
99fde513 207 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
febf1dff
MB		 208 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
209 else
210 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
211 mutex_unlock(&wm->codec_mutex);
212}
213EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
214
215/*
216 * Codec GPIO pin configuration, this sets pin direction, polarity,
217 * stickyness and wake up.
218 */
219void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
220 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
221 enum wm97xx_gpio_wake wake)
222{
223 u16 reg;
224
225 mutex_lock(&wm->codec_mutex);
226 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
227
228 if (pol == WM97XX_GPIO_POL_HIGH)
229 reg |= gpio;
230 else
231 reg &= ~gpio;
232
233 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
234 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
235
236 if (sticky == WM97XX_GPIO_STICKY)
237 reg |= gpio;
238 else
239 reg &= ~gpio;
240
241 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
242 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
243
244 if (wake == WM97XX_GPIO_WAKE)
245 reg |= gpio;
246 else
247 reg &= ~gpio;
248
249 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
250 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
251
252 if (dir == WM97XX_GPIO_IN)
253 reg |= gpio;
254 else
255 reg &= ~gpio;
256
257 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
258 mutex_unlock(&wm->codec_mutex);
259}
260EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
261
34d27853
MB		 262/*
263 * Configure the WM97XX_PRP value to use while system is suspended.
264 * If a value other than 0 is set then WM97xx pen detection will be
265 * left enabled in the configured mode while the system is in suspend,
266 * the device has users and suspend has not been disabled via the
267 * wakeup sysfs entries.
268 *
269 * @wm: WM97xx device to configure
270 * @mode: WM97XX_PRP value to configure while suspended
271 */
272void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
273{
274 wm->suspend_mode = mode;
275 device_init_wakeup(&wm->input_dev->dev, mode != 0);
276}
277EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
278
febf1dff
MB		 279/*
280 * Handle a pen down interrupt.
281 */
282static void wm97xx_pen_irq_worker(struct work_struct *work)
283{
284 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
285 int pen_was_down = wm->pen_is_down;
286
287 /* do we need to enable the touch panel reader */
288 if (wm->id == WM9705_ID2) {
289 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
290 WM97XX_PEN_DOWN)
291 wm->pen_is_down = 1;
292 else
293 wm->pen_is_down = 0;
294 } else {
295 u16 status, pol;
296 mutex_lock(&wm->codec_mutex);
297 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
298 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
299
300 if (WM97XX_GPIO_13 & pol & status) {
301 wm->pen_is_down = 1;
302 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
303 ~WM97XX_GPIO_13);
304 } else {
305 wm->pen_is_down = 0;
306 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
307 WM97XX_GPIO_13);
308 }
309
99fde513 310 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
febf1dff
MB		 311 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
312 ~WM97XX_GPIO_13) << 1);
313 else
314 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
315 ~WM97XX_GPIO_13);
316 mutex_unlock(&wm->codec_mutex);
317 }
318
319 /* If the system is not using continuous mode or it provides a
320 * pen down operation then we need to schedule polls while the
321 * pen is down. Otherwise the machine driver is responsible
322 * for scheduling reads.
323 */
324 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
325 if (wm->pen_is_down && !pen_was_down) {
326 /* Data is not availiable immediately on pen down */
327 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
328 }
329
330 /* Let ts_reader report the pen up for debounce. */
331 if (!wm->pen_is_down && pen_was_down)
332 wm->pen_is_down = 1;
333 }
334
335 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
336 wm->mach_ops->acc_pen_up(wm);
337
338 wm->mach_ops->irq_enable(wm, 1);
339}
340
341/*
342 * Codec PENDOWN irq handler
343 *
344 * We have to disable the codec interrupt in the handler because it
345 * can take upto 1ms to clear the interrupt source. We schedule a task
d808fbe5
MB		 346 * in a work queue to do the actual interaction with the chip. The
347 * interrupt is then enabled again in the slow handler when the source
348 * has been cleared.
febf1dff
MB		 349 */
350static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
351{
352 struct wm97xx *wm = dev_id;
353
d808fbe5
MB		 354 if (!work_pending(&wm->pen_event_work)) {
355 wm->mach_ops->irq_enable(wm, 0);
356 queue_work(wm->ts_workq, &wm->pen_event_work);
357 }
febf1dff
MB		 358
359 return IRQ_HANDLED;
360}
361
362/*
363 * initialise pen IRQ handler and workqueue
364 */
365static int wm97xx_init_pen_irq(struct wm97xx *wm)
366{
367 u16 reg;
368
369 /* If an interrupt is supplied an IRQ enable operation must also be
370 * provided. */
371 BUG_ON(!wm->mach_ops->irq_enable);
372
4f295232 373 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
febf1dff
MB		 374 "wm97xx-pen", wm)) {
375 dev_err(wm->dev,
376 "Failed to register pen down interrupt, polling");
377 wm->pen_irq = 0;
378 return -EINVAL;
379 }
380
381 /* Configure GPIO as interrupt source on WM971x */
382 if (wm->id != WM9705_ID2) {
383 BUG_ON(!wm->mach_ops->irq_gpio);
384 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
385 wm97xx_reg_write(wm, AC97_MISC_AFE,
386 reg & ~(wm->mach_ops->irq_gpio));
387 reg = wm97xx_reg_read(wm, 0x5a);
388 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
389 }
390
391 return 0;
392}
393
394static int wm97xx_read_samples(struct wm97xx *wm)
395{
396 struct wm97xx_data data;
397 int rc;
398
399 mutex_lock(&wm->codec_mutex);
400
401 if (wm->mach_ops && wm->mach_ops->acc_enabled)
402 rc = wm->mach_ops->acc_pen_down(wm);
403 else
404 rc = wm->codec->poll_touch(wm, &data);
405
406 if (rc & RC_PENUP) {
407 if (wm->pen_is_down) {
408 wm->pen_is_down = 0;
409 dev_dbg(wm->dev, "pen up\n");
410 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
65db86ac 411 input_report_key(wm->input_dev, BTN_TOUCH, 0);
febf1dff
MB		 412 input_sync(wm->input_dev);
413 } else if (!(rc & RC_AGAIN)) {
414 /* We need high frequency updates only while
415 * pen is down, the user never will be able to
416 * touch screen faster than a few times per
417 * second... On the other hand, when the user
418 * is actively working with the touchscreen we
419 * don't want to lose the quick response. So we
420 * will slowly increase sleep time after the
421 * pen is up and quicky restore it to ~one task
422 * switch when pen is down again.
423 */
424 if (wm->ts_reader_interval < HZ / 10)
425 wm->ts_reader_interval++;
426 }
427
428 } else if (rc & RC_VALID) {
429 dev_dbg(wm->dev,
430 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
431 data.x >> 12, data.x & 0xfff, data.y >> 12,
432 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
433 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
434 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
435 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
65db86ac 436 input_report_key(wm->input_dev, BTN_TOUCH, 1);
febf1dff
MB		 437 input_sync(wm->input_dev);
438 wm->pen_is_down = 1;
439 wm->ts_reader_interval = wm->ts_reader_min_interval;
440 } else if (rc & RC_PENDOWN) {
441 dev_dbg(wm->dev, "pen down\n");
442 wm->pen_is_down = 1;
443 wm->ts_reader_interval = wm->ts_reader_min_interval;
444 }
445
446 mutex_unlock(&wm->codec_mutex);
447 return rc;
448}
449
450/*
451* The touchscreen sample reader.
452*/
453static void wm97xx_ts_reader(struct work_struct *work)
454{
455 int rc;
456 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
457
458 BUG_ON(!wm->codec);
459
460 do {
461 rc = wm97xx_read_samples(wm);
462 } while (rc & RC_AGAIN);
463
464 if (wm->pen_is_down || !wm->pen_irq)
465 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
466 wm->ts_reader_interval);
467}
468
469/**
470 * wm97xx_ts_input_open - Open the touch screen input device.
471 * @idev: Input device to be opened.
472 *
473 * Called by the input sub system to open a wm97xx touchscreen device.
474 * Starts the touchscreen thread and touch digitiser.
475 */
476static int wm97xx_ts_input_open(struct input_dev *idev)
477{
478 struct wm97xx *wm = input_get_drvdata(idev);
479
480 wm->ts_workq = create_singlethread_workqueue("kwm97xx");
481 if (wm->ts_workq == NULL) {
482 dev_err(wm->dev,
483 "Failed to create workqueue\n");
484 return -EINVAL;
485 }
486
487 /* start digitiser */
488 if (wm->mach_ops && wm->mach_ops->acc_enabled)
489 wm->codec->acc_enable(wm, 1);
490 wm->codec->dig_enable(wm, 1);
491
492 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
493 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
494
495 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
496 if (wm->ts_reader_min_interval < 1)
497 wm->ts_reader_min_interval = 1;
498 wm->ts_reader_interval = wm->ts_reader_min_interval;
499
500 wm->pen_is_down = 0;
501 if (wm->pen_irq)
502 wm97xx_init_pen_irq(wm);
503 else
504 dev_err(wm->dev, "No IRQ specified\n");
505
506 /* If we either don't have an interrupt for pen down events or
507 * failed to acquire it then we need to poll.
508 */
509 if (wm->pen_irq == 0)
510 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
511 wm->ts_reader_interval);
512
513 return 0;
514}
515
516/**
517 * wm97xx_ts_input_close - Close the touch screen input device.
518 * @idev: Input device to be closed.
519 *
520 * Called by the input sub system to close a wm97xx touchscreen
521 * device. Kills the touchscreen thread and stops the touch
522 * digitiser.
523 */
524
525static void wm97xx_ts_input_close(struct input_dev *idev)
526{
527 struct wm97xx *wm = input_get_drvdata(idev);
528 u16 reg;
529
530 if (wm->pen_irq) {
531 /* Return the interrupt to GPIO usage (disabling it) */
532 if (wm->id != WM9705_ID2) {
533 BUG_ON(!wm->mach_ops->irq_gpio);
534 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
535 wm97xx_reg_write(wm, AC97_MISC_AFE,
536 reg | wm->mach_ops->irq_gpio);
537 }
538
539 free_irq(wm->pen_irq, wm);
540 }
541
542 wm->pen_is_down = 0;
543
544 /* Balance out interrupt disables/enables */
545 if (cancel_work_sync(&wm->pen_event_work))
546 wm->mach_ops->irq_enable(wm, 1);
547
548 /* ts_reader rearms itself so we need to explicitly stop it
549 * before we destroy the workqueue.
550 */
551 cancel_delayed_work_sync(&wm->ts_reader);
552
553 destroy_workqueue(wm->ts_workq);
554
555 /* stop digitiser */
556 wm->codec->dig_enable(wm, 0);
557 if (wm->mach_ops && wm->mach_ops->acc_enabled)
558 wm->codec->acc_enable(wm, 0);
559}
560
561static int wm97xx_probe(struct device *dev)
562{
563 struct wm97xx *wm;
564 int ret = 0, id = 0;
565
566 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
567 if (!wm)
568 return -ENOMEM;
569 mutex_init(&wm->codec_mutex);
570
571 wm->dev = dev;
84e5b0d0 572 dev_set_drvdata(dev, wm);
febf1dff
MB		 573 wm->ac97 = to_ac97_t(dev);
574
575 /* check that we have a supported codec */
576 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
577 if (id != WM97XX_ID1) {
578 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
579 ret = -ENODEV;
580 goto alloc_err;
581 }
582
583 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
584
99fde513
MV		 585 wm->variant = WM97xx_GENERIC;
586
febf1dff
MB		 587 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
588
589 switch (wm->id & 0xff) {
590#ifdef CONFIG_TOUCHSCREEN_WM9705
591 case 0x05:
592 wm->codec = &wm9705_codec;
593 break;
594#endif
595#ifdef CONFIG_TOUCHSCREEN_WM9712
596 case 0x12:
597 wm->codec = &wm9712_codec;
598 break;
599#endif
600#ifdef CONFIG_TOUCHSCREEN_WM9713
601 case 0x13:
602 wm->codec = &wm9713_codec;
603 break;
604#endif
605 default:
606 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
607 wm->id & 0xff);
608 ret = -ENODEV;
609 goto alloc_err;
610 }
611
5de4cd43
MB		 612 /* set up physical characteristics */
613 wm->codec->phy_init(wm);
614
615 /* load gpio cache */
616 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
617 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
618 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
619 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
620 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
621 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
622
febf1dff
MB		 623 wm->input_dev = input_allocate_device();
624 if (wm->input_dev == NULL) {
625 ret = -ENOMEM;
626 goto alloc_err;
627 }
628
629 /* set up touch configuration */
630 wm->input_dev->name = "wm97xx touchscreen";
6b32ca39 631 wm->input_dev->phys = "wm97xx";
febf1dff
MB		 632 wm->input_dev->open = wm97xx_ts_input_open;
633 wm->input_dev->close = wm97xx_ts_input_close;
65db86ac
MR		 634
635 __set_bit(EV_ABS, wm->input_dev->evbit);
636 __set_bit(EV_KEY, wm->input_dev->evbit);
637 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
638
febf1dff
MB		 639 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
640 abs_x[2], 0);
641 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
642 abs_y[2], 0);
643 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
644 abs_p[2], 0);
65db86ac 645
febf1dff
MB		 646 input_set_drvdata(wm->input_dev, wm);
647 wm->input_dev->dev.parent = dev;
65db86ac 648
febf1dff
MB		 649 ret = input_register_device(wm->input_dev);
650 if (ret < 0)
651 goto dev_alloc_err;
652
febf1dff
MB		 653 /* register our battery device */
654 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
655 if (!wm->battery_dev) {
656 ret = -ENOMEM;
657 goto batt_err;
658 }
659 platform_set_drvdata(wm->battery_dev, wm);
660 wm->battery_dev->dev.parent = dev;
661 ret = platform_device_add(wm->battery_dev);
662 if (ret < 0)
663 goto batt_reg_err;
664
665 /* register our extended touch device (for machine specific
666 * extensions) */
667 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
668 if (!wm->touch_dev) {
669 ret = -ENOMEM;
670 goto touch_err;
671 }
672 platform_set_drvdata(wm->touch_dev, wm);
673 wm->touch_dev->dev.parent = dev;
674 ret = platform_device_add(wm->touch_dev);
675 if (ret < 0)
676 goto touch_reg_err;
677
678 return ret;
679
680 touch_reg_err:
681 platform_device_put(wm->touch_dev);
682 touch_err:
683 platform_device_unregister(wm->battery_dev);
684 wm->battery_dev = NULL;
685 batt_reg_err:
686 platform_device_put(wm->battery_dev);
687 batt_err:
688 input_unregister_device(wm->input_dev);
689 wm->input_dev = NULL;
690 dev_alloc_err:
691 input_free_device(wm->input_dev);
692 alloc_err:
693 kfree(wm);
694
695 return ret;
696}
697
698static int wm97xx_remove(struct device *dev)
699{
700 struct wm97xx *wm = dev_get_drvdata(dev);
701
702 platform_device_unregister(wm->battery_dev);
703 platform_device_unregister(wm->touch_dev);
704 input_unregister_device(wm->input_dev);
705 kfree(wm);
706
707 return 0;
708}
709
710#ifdef CONFIG_PM
711static int wm97xx_suspend(struct device *dev, pm_message_t state)
712{
713 struct wm97xx *wm = dev_get_drvdata(dev);
34d27853
MB		 714 u16 reg;
715 int suspend_mode;
716
717 if (device_may_wakeup(&wm->input_dev->dev))
718 suspend_mode = wm->suspend_mode;
719 else
720 suspend_mode = 0;
febf1dff
MB		 721
722 if (wm->input_dev->users)
723 cancel_delayed_work_sync(&wm->ts_reader);
724
34d27853
MB		 725 /* Power down the digitiser (bypassing the cache for resume) */
726 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
727 reg &= ~WM97XX_PRP_DET_DIG;
728 if (wm->input_dev->users)
729 reg |= suspend_mode;
730 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
731
732 /* WM9713 has an additional power bit - turn it off if there
733 * are no users or if suspend mode is zero. */
734 if (wm->id == WM9713_ID2 &&
735 (!wm->input_dev->users || !suspend_mode)) {
736 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
737 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
738 }
739
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MB		 740 return 0;
741}
742
743static int wm97xx_resume(struct device *dev)
744{
745 struct wm97xx *wm = dev_get_drvdata(dev);
746
747 /* restore digitiser and gpios */
748 if (wm->id == WM9713_ID2) {
749 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
750 wm97xx_reg_write(wm, 0x5a, wm->misc);
751 if (wm->input_dev->users) {
752 u16 reg;
753 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
754 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
755 }
756 }
757
758 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
759 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
760
761 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
762 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
763 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
764 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
765 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
766 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
767
768 if (wm->input_dev->users && !wm->pen_irq) {
769 wm->ts_reader_interval = wm->ts_reader_min_interval;
770 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
771 wm->ts_reader_interval);
772 }
773
774 return 0;
775}
776
777#else
778#define wm97xx_suspend NULL
779#define wm97xx_resume NULL
780#endif
781
782/*
783 * Machine specific operations
784 */
785int wm97xx_register_mach_ops(struct wm97xx *wm,
786 struct wm97xx_mach_ops *mach_ops)
787{
788 mutex_lock(&wm->codec_mutex);
789 if (wm->mach_ops) {
790 mutex_unlock(&wm->codec_mutex);
791 return -EINVAL;
792 }
793 wm->mach_ops = mach_ops;
794 mutex_unlock(&wm->codec_mutex);
795
796 return 0;
797}
798EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
799
800void wm97xx_unregister_mach_ops(struct wm97xx *wm)
801{
802 mutex_lock(&wm->codec_mutex);
803 wm->mach_ops = NULL;
804 mutex_unlock(&wm->codec_mutex);
805}
806EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
807
808static struct device_driver wm97xx_driver = {
ef9db492 809 .name = "wm97xx-ts",
febf1dff
MB		 810 .bus = &ac97_bus_type,
811 .owner = THIS_MODULE,
812 .probe = wm97xx_probe,
813 .remove = wm97xx_remove,
814 .suspend = wm97xx_suspend,
815 .resume = wm97xx_resume,
816};
817
818static int __init wm97xx_init(void)
819{
820 return driver_register(&wm97xx_driver);
821}
822
823static void __exit wm97xx_exit(void)
824{
825 driver_unregister(&wm97xx_driver);
826}
827
828module_init(wm97xx_init);
829module_exit(wm97xx_exit);
830
831/* Module information */
b8d055a8 832MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
febf1dff
MB		 833MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
834MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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