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Input: wm97xx - update email address for Liam Girdwood
[linux-2.6-block.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>
39#include <linux/version.h>
40#include <linux/kernel.h>
41#include <linux/init.h>
42#include <linux/delay.h>
43#include <linux/string.h>
44#include <linux/proc_fs.h>
45#include <linux/pm.h>
46#include <linux/interrupt.h>
47#include <linux/bitops.h>
48#include <linux/workqueue.h>
49#include <linux/wm97xx.h>
50#include <linux/uaccess.h>
51#include <linux/io.h>
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;
128
129 /* get codec */
130 mutex_lock(&wm->codec_mutex);
131
132 /* When the touchscreen is not in use, we may have to power up
133 * the AUX ADC before we can use sample the AUX inputs->
134 */
135 if (wm->id == WM9713_ID2 &&
136 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
137 power_adc = 1;
138 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
139 }
140
141 /* Prepare the codec for AUX reading */
142 wm->codec->aux_prepare(wm);
143
144 /* Turn polling mode on to read AUX ADC */
145 wm->pen_probably_down = 1;
146 wm->codec->poll_sample(wm, adcsel, &auxval);
147
148 if (power_adc)
149 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
150
151 wm->codec->dig_restore(wm);
152
153 wm->pen_probably_down = 0;
154
155 mutex_unlock(&wm->codec_mutex);
156 return auxval & 0xfff;
157}
158EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
159
160/**
161 * wm97xx_get_gpio - Get the status of a codec GPIO.
162 * @wm: wm97xx device.
163 * @gpio: gpio
164 *
165 * Get the status of a codec GPIO pin
166 */
167
168enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
169{
170 u16 status;
171 enum wm97xx_gpio_status ret;
172
173 mutex_lock(&wm->codec_mutex);
174 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
175
176 if (status & gpio)
177 ret = WM97XX_GPIO_HIGH;
178 else
179 ret = WM97XX_GPIO_LOW;
180
181 mutex_unlock(&wm->codec_mutex);
182 return ret;
183}
184EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
185
186/**
187 * wm97xx_set_gpio - Set the status of a codec GPIO.
188 * @wm: wm97xx device.
189 * @gpio: gpio
190 *
191 *
192 * Set the status of a codec GPIO pin
193 */
194
195void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
196 enum wm97xx_gpio_status status)
197{
198 u16 reg;
199
200 mutex_lock(&wm->codec_mutex);
201 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
202
203 if (status & WM97XX_GPIO_HIGH)
204 reg |= gpio;
205 else
206 reg &= ~gpio;
207
208 if (wm->id == WM9712_ID2)
209 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
210 else
211 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
212 mutex_unlock(&wm->codec_mutex);
213}
214EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
215
216/*
217 * Codec GPIO pin configuration, this sets pin direction, polarity,
218 * stickyness and wake up.
219 */
220void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
221 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
222 enum wm97xx_gpio_wake wake)
223{
224 u16 reg;
225
226 mutex_lock(&wm->codec_mutex);
227 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
228
229 if (pol == WM97XX_GPIO_POL_HIGH)
230 reg |= gpio;
231 else
232 reg &= ~gpio;
233
234 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
235 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
236
237 if (sticky == WM97XX_GPIO_STICKY)
238 reg |= gpio;
239 else
240 reg &= ~gpio;
241
242 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
243 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
244
245 if (wake == WM97XX_GPIO_WAKE)
246 reg |= gpio;
247 else
248 reg &= ~gpio;
249
250 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
251 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
252
253 if (dir == WM97XX_GPIO_IN)
254 reg |= gpio;
255 else
256 reg &= ~gpio;
257
258 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
259 mutex_unlock(&wm->codec_mutex);
260}
261EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
262
34d27853
MB		 263/*
264 * Configure the WM97XX_PRP value to use while system is suspended.
265 * If a value other than 0 is set then WM97xx pen detection will be
266 * left enabled in the configured mode while the system is in suspend,
267 * the device has users and suspend has not been disabled via the
268 * wakeup sysfs entries.
269 *
270 * @wm: WM97xx device to configure
271 * @mode: WM97XX_PRP value to configure while suspended
272 */
273void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
274{
275 wm->suspend_mode = mode;
276 device_init_wakeup(&wm->input_dev->dev, mode != 0);
277}
278EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
279
febf1dff
MB		 280/*
281 * Handle a pen down interrupt.
282 */
283static void wm97xx_pen_irq_worker(struct work_struct *work)
284{
285 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
286 int pen_was_down = wm->pen_is_down;
287
288 /* do we need to enable the touch panel reader */
289 if (wm->id == WM9705_ID2) {
290 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
291 WM97XX_PEN_DOWN)
292 wm->pen_is_down = 1;
293 else
294 wm->pen_is_down = 0;
295 } else {
296 u16 status, pol;
297 mutex_lock(&wm->codec_mutex);
298 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
299 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
300
301 if (WM97XX_GPIO_13 & pol & status) {
302 wm->pen_is_down = 1;
303 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
304 ~WM97XX_GPIO_13);
305 } else {
306 wm->pen_is_down = 0;
307 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
308 WM97XX_GPIO_13);
309 }
310
311 if (wm->id == WM9712_ID2)
312 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
313 ~WM97XX_GPIO_13) << 1);
314 else
315 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
316 ~WM97XX_GPIO_13);
317 mutex_unlock(&wm->codec_mutex);
318 }
319
320 /* If the system is not using continuous mode or it provides a
321 * pen down operation then we need to schedule polls while the
322 * pen is down. Otherwise the machine driver is responsible
323 * for scheduling reads.
324 */
325 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
326 if (wm->pen_is_down && !pen_was_down) {
327 /* Data is not availiable immediately on pen down */
328 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
329 }
330
331 /* Let ts_reader report the pen up for debounce. */
332 if (!wm->pen_is_down && pen_was_down)
333 wm->pen_is_down = 1;
334 }
335
336 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
337 wm->mach_ops->acc_pen_up(wm);
338
339 wm->mach_ops->irq_enable(wm, 1);
340}
341
342/*
343 * Codec PENDOWN irq handler
344 *
345 * We have to disable the codec interrupt in the handler because it
346 * can take upto 1ms to clear the interrupt source. We schedule a task
d808fbe5
MB		 347 * in a work queue to do the actual interaction with the chip. The
348 * interrupt is then enabled again in the slow handler when the source
349 * has been cleared.
febf1dff
MB		 350 */
351static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
352{
353 struct wm97xx *wm = dev_id;
354
d808fbe5
MB		 355 if (!work_pending(&wm->pen_event_work)) {
356 wm->mach_ops->irq_enable(wm, 0);
357 queue_work(wm->ts_workq, &wm->pen_event_work);
358 }
febf1dff
MB		 359
360 return IRQ_HANDLED;
361}
362
363/*
364 * initialise pen IRQ handler and workqueue
365 */
366static int wm97xx_init_pen_irq(struct wm97xx *wm)
367{
368 u16 reg;
369
370 /* If an interrupt is supplied an IRQ enable operation must also be
371 * provided. */
372 BUG_ON(!wm->mach_ops->irq_enable);
373
db7c10e7
MB		 374 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt,
375 IRQF_SHARED | IRQF_SAMPLE_RANDOM,
febf1dff
MB		 376 "wm97xx-pen", wm)) {
377 dev_err(wm->dev,
378 "Failed to register pen down interrupt, polling");
379 wm->pen_irq = 0;
380 return -EINVAL;
381 }
382
383 /* Configure GPIO as interrupt source on WM971x */
384 if (wm->id != WM9705_ID2) {
385 BUG_ON(!wm->mach_ops->irq_gpio);
386 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
387 wm97xx_reg_write(wm, AC97_MISC_AFE,
388 reg & ~(wm->mach_ops->irq_gpio));
389 reg = wm97xx_reg_read(wm, 0x5a);
390 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
391 }
392
393 return 0;
394}
395
396static int wm97xx_read_samples(struct wm97xx *wm)
397{
398 struct wm97xx_data data;
399 int rc;
400
401 mutex_lock(&wm->codec_mutex);
402
403 if (wm->mach_ops && wm->mach_ops->acc_enabled)
404 rc = wm->mach_ops->acc_pen_down(wm);
405 else
406 rc = wm->codec->poll_touch(wm, &data);
407
408 if (rc & RC_PENUP) {
409 if (wm->pen_is_down) {
410 wm->pen_is_down = 0;
411 dev_dbg(wm->dev, "pen up\n");
412 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
413 input_sync(wm->input_dev);
414 } else if (!(rc & RC_AGAIN)) {
415 /* We need high frequency updates only while
416 * pen is down, the user never will be able to
417 * touch screen faster than a few times per
418 * second... On the other hand, when the user
419 * is actively working with the touchscreen we
420 * don't want to lose the quick response. So we
421 * will slowly increase sleep time after the
422 * pen is up and quicky restore it to ~one task
423 * switch when pen is down again.
424 */
425 if (wm->ts_reader_interval < HZ / 10)
426 wm->ts_reader_interval++;
427 }
428
429 } else if (rc & RC_VALID) {
430 dev_dbg(wm->dev,
431 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
432 data.x >> 12, data.x & 0xfff, data.y >> 12,
433 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
434 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
435 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
436 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
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;
572 dev->driver_data = wm;
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
585 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
586
587 switch (wm->id & 0xff) {
588#ifdef CONFIG_TOUCHSCREEN_WM9705
589 case 0x05:
590 wm->codec = &wm9705_codec;
591 break;
592#endif
593#ifdef CONFIG_TOUCHSCREEN_WM9712
594 case 0x12:
595 wm->codec = &wm9712_codec;
596 break;
597#endif
598#ifdef CONFIG_TOUCHSCREEN_WM9713
599 case 0x13:
600 wm->codec = &wm9713_codec;
601 break;
602#endif
603 default:
604 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
605 wm->id & 0xff);
606 ret = -ENODEV;
607 goto alloc_err;
608 }
609
5de4cd43
MB		 610 /* set up physical characteristics */
611 wm->codec->phy_init(wm);
612
613 /* load gpio cache */
614 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
615 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
616 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
617 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
618 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
619 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
620
febf1dff
MB		 621 wm->input_dev = input_allocate_device();
622 if (wm->input_dev == NULL) {
623 ret = -ENOMEM;
624 goto alloc_err;
625 }
626
627 /* set up touch configuration */
628 wm->input_dev->name = "wm97xx touchscreen";
6b32ca39 629 wm->input_dev->phys = "wm97xx";
febf1dff
MB		 630 wm->input_dev->open = wm97xx_ts_input_open;
631 wm->input_dev->close = wm97xx_ts_input_close;
632 set_bit(EV_ABS, wm->input_dev->evbit);
633 set_bit(ABS_X, wm->input_dev->absbit);
634 set_bit(ABS_Y, wm->input_dev->absbit);
635 set_bit(ABS_PRESSURE, wm->input_dev->absbit);
636 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
637 abs_x[2], 0);
638 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
639 abs_y[2], 0);
640 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
641 abs_p[2], 0);
642 input_set_drvdata(wm->input_dev, wm);
643 wm->input_dev->dev.parent = dev;
644 ret = input_register_device(wm->input_dev);
645 if (ret < 0)
646 goto dev_alloc_err;
647
febf1dff
MB		 648 /* register our battery device */
649 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
650 if (!wm->battery_dev) {
651 ret = -ENOMEM;
652 goto batt_err;
653 }
654 platform_set_drvdata(wm->battery_dev, wm);
655 wm->battery_dev->dev.parent = dev;
656 ret = platform_device_add(wm->battery_dev);
657 if (ret < 0)
658 goto batt_reg_err;
659
660 /* register our extended touch device (for machine specific
661 * extensions) */
662 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
663 if (!wm->touch_dev) {
664 ret = -ENOMEM;
665 goto touch_err;
666 }
667 platform_set_drvdata(wm->touch_dev, wm);
668 wm->touch_dev->dev.parent = dev;
669 ret = platform_device_add(wm->touch_dev);
670 if (ret < 0)
671 goto touch_reg_err;
672
673 return ret;
674
675 touch_reg_err:
676 platform_device_put(wm->touch_dev);
677 touch_err:
678 platform_device_unregister(wm->battery_dev);
679 wm->battery_dev = NULL;
680 batt_reg_err:
681 platform_device_put(wm->battery_dev);
682 batt_err:
683 input_unregister_device(wm->input_dev);
684 wm->input_dev = NULL;
685 dev_alloc_err:
686 input_free_device(wm->input_dev);
687 alloc_err:
688 kfree(wm);
689
690 return ret;
691}
692
693static int wm97xx_remove(struct device *dev)
694{
695 struct wm97xx *wm = dev_get_drvdata(dev);
696
697 platform_device_unregister(wm->battery_dev);
698 platform_device_unregister(wm->touch_dev);
699 input_unregister_device(wm->input_dev);
700 kfree(wm);
701
702 return 0;
703}
704
705#ifdef CONFIG_PM
706static int wm97xx_suspend(struct device *dev, pm_message_t state)
707{
708 struct wm97xx *wm = dev_get_drvdata(dev);
34d27853
MB		 709 u16 reg;
710 int suspend_mode;
711
712 if (device_may_wakeup(&wm->input_dev->dev))
713 suspend_mode = wm->suspend_mode;
714 else
715 suspend_mode = 0;
febf1dff
MB		 716
717 if (wm->input_dev->users)
718 cancel_delayed_work_sync(&wm->ts_reader);
719
34d27853
MB		 720 /* Power down the digitiser (bypassing the cache for resume) */
721 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
722 reg &= ~WM97XX_PRP_DET_DIG;
723 if (wm->input_dev->users)
724 reg |= suspend_mode;
725 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
726
727 /* WM9713 has an additional power bit - turn it off if there
728 * are no users or if suspend mode is zero. */
729 if (wm->id == WM9713_ID2 &&
730 (!wm->input_dev->users || !suspend_mode)) {
731 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
732 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
733 }
734
febf1dff
MB		 735 return 0;
736}
737
738static int wm97xx_resume(struct device *dev)
739{
740 struct wm97xx *wm = dev_get_drvdata(dev);
741
742 /* restore digitiser and gpios */
743 if (wm->id == WM9713_ID2) {
744 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
745 wm97xx_reg_write(wm, 0x5a, wm->misc);
746 if (wm->input_dev->users) {
747 u16 reg;
748 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
749 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
750 }
751 }
752
753 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
754 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
755
756 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
757 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
758 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
759 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
760 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
761 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
762
763 if (wm->input_dev->users && !wm->pen_irq) {
764 wm->ts_reader_interval = wm->ts_reader_min_interval;
765 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
766 wm->ts_reader_interval);
767 }
768
769 return 0;
770}
771
772#else
773#define wm97xx_suspend NULL
774#define wm97xx_resume NULL
775#endif
776
777/*
778 * Machine specific operations
779 */
780int wm97xx_register_mach_ops(struct wm97xx *wm,
781 struct wm97xx_mach_ops *mach_ops)
782{
783 mutex_lock(&wm->codec_mutex);
784 if (wm->mach_ops) {
785 mutex_unlock(&wm->codec_mutex);
786 return -EINVAL;
787 }
788 wm->mach_ops = mach_ops;
789 mutex_unlock(&wm->codec_mutex);
790
791 return 0;
792}
793EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
794
795void wm97xx_unregister_mach_ops(struct wm97xx *wm)
796{
797 mutex_lock(&wm->codec_mutex);
798 wm->mach_ops = NULL;
799 mutex_unlock(&wm->codec_mutex);
800}
801EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
802
803static struct device_driver wm97xx_driver = {
ef9db492 804 .name = "wm97xx-ts",
febf1dff
MB		 805 .bus = &ac97_bus_type,
806 .owner = THIS_MODULE,
807 .probe = wm97xx_probe,
808 .remove = wm97xx_remove,
809 .suspend = wm97xx_suspend,
810 .resume = wm97xx_resume,
811};
812
813static int __init wm97xx_init(void)
814{
815 return driver_register(&wm97xx_driver);
816}
817
818static void __exit wm97xx_exit(void)
819{
820 driver_unregister(&wm97xx_driver);
821}
822
823module_init(wm97xx_init);
824module_exit(wm97xx_exit);
825
826/* Module information */
b8d055a8 827MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
febf1dff
MB		 828MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
829MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)