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path: root/drivers/input/touchscreen/wm97xx-core.c
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-rw-r--r--drivers/input/touchscreen/wm97xx-core.c829
1 files changed, 829 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
new file mode 100644
index 0000000000..e9c7ea46b6
--- /dev/null
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -0,0 +1,829 @@
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.
6 * Author: Liam Girdwood
7 * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com
8 * Parts Copyright : Ian Molton <spyro@f2s.com>
9 * Andrew Zabolotny <zap@homelink.ru>
10 * Russell King <rmk@arm.linux.org.uk>
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
16 *
17 * Notes:
18 *
19 * Features:
20 * - supports WM9705, WM9712, WM9713
21 * - polling mode
22 * - continuous mode (arch-dependent)
23 * - adjustable rpu/dpp settings
24 * - adjustable pressure current
25 * - adjustable sample settle delay
26 * - 4 and 5 wire touchscreens (5 wire is WM9712 only)
27 * - pen down detection
28 * - battery monitor
29 * - sample AUX adcs
30 * - power management
31 * - codec GPIO
32 * - codec event notification
33 * Todo
34 * - Support for async sampling control for noisy LCDs.
35 *
36 */
37
38#include <linux/module.h>
39#include <linux/moduleparam.h>
40#include <linux/version.h>
41#include <linux/kernel.h>
42#include <linux/init.h>
43#include <linux/delay.h>
44#include <linux/string.h>
45#include <linux/proc_fs.h>
46#include <linux/pm.h>
47#include <linux/interrupt.h>
48#include <linux/bitops.h>
49#include <linux/workqueue.h>
50#include <linux/wm97xx.h>
51#include <linux/uaccess.h>
52#include <linux/io.h>
53
54#define TS_NAME "wm97xx"
55#define WM_CORE_VERSION "1.00"
56#define DEFAULT_PRESSURE 0xb0c0
57
58
59/*
60 * Touchscreen absolute values
61 *
62 * These parameters are used to help the input layer discard out of
63 * range readings and reduce jitter etc.
64 *
65 * o min, max:- indicate the min and max values your touch screen returns
66 * o fuzz:- use a higher number to reduce jitter
67 *
68 * The default values correspond to Mainstone II in QVGA mode
69 *
70 * Please read
71 * Documentation/input/input-programming.txt for more details.
72 */
73
74static int abs_x[3] = {350, 3900, 5};
75module_param_array(abs_x, int, NULL, 0);
76MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
77
78static int abs_y[3] = {320, 3750, 40};
79module_param_array(abs_y, int, NULL, 0);
80MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
81
82static int abs_p[3] = {0, 150, 4};
83module_param_array(abs_p, int, NULL, 0);
84MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
85
86/*
87 * wm97xx IO access, all IO locking done by AC97 layer
88 */
89int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
90{
91 if (wm->ac97)
92 return wm->ac97->bus->ops->read(wm->ac97, reg);
93 else
94 return -1;
95}
96EXPORT_SYMBOL_GPL(wm97xx_reg_read);
97
98void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
99{
100 /* cache digitiser registers */
101 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
102 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
103
104 /* cache gpio regs */
105 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
106 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
107
108 /* wm9713 irq reg */
109 if (reg == 0x5a)
110 wm->misc = val;
111
112 if (wm->ac97)
113 wm->ac97->bus->ops->write(wm->ac97, reg, val);
114}
115EXPORT_SYMBOL_GPL(wm97xx_reg_write);
116
117/**
118 * wm97xx_read_aux_adc - Read the aux adc.
119 * @wm: wm97xx device.
120 * @adcsel: codec ADC to be read
121 *
122 * Reads the selected AUX ADC.
123 */
124
125int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
126{
127 int power_adc = 0, auxval;
128 u16 power = 0;
129
130 /* get codec */
131 mutex_lock(&wm->codec_mutex);
132
133 /* When the touchscreen is not in use, we may have to power up
134 * the AUX ADC before we can use sample the AUX inputs->
135 */
136 if (wm->id == WM9713_ID2 &&
137 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
138 power_adc = 1;
139 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
140 }
141
142 /* Prepare the codec for AUX reading */
143 wm->codec->aux_prepare(wm);
144
145 /* Turn polling mode on to read AUX ADC */
146 wm->pen_probably_down = 1;
147 wm->codec->poll_sample(wm, adcsel, &auxval);
148
149 if (power_adc)
150 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
151
152 wm->codec->dig_restore(wm);
153
154 wm->pen_probably_down = 0;
155
156 mutex_unlock(&wm->codec_mutex);
157 return auxval & 0xfff;
158}
159EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
160
161/**
162 * wm97xx_get_gpio - Get the status of a codec GPIO.
163 * @wm: wm97xx device.
164 * @gpio: gpio
165 *
166 * Get the status of a codec GPIO pin
167 */
168
169enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
170{
171 u16 status;
172 enum wm97xx_gpio_status ret;
173
174 mutex_lock(&wm->codec_mutex);
175 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
176
177 if (status & gpio)
178 ret = WM97XX_GPIO_HIGH;
179 else
180 ret = WM97XX_GPIO_LOW;
181
182 mutex_unlock(&wm->codec_mutex);
183 return ret;
184}
185EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
186
187/**
188 * wm97xx_set_gpio - Set the status of a codec GPIO.
189 * @wm: wm97xx device.
190 * @gpio: gpio
191 *
192 *
193 * Set the status of a codec GPIO pin
194 */
195
196void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
197 enum wm97xx_gpio_status status)
198{
199 u16 reg;
200
201 mutex_lock(&wm->codec_mutex);
202 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
203
204 if (status & WM97XX_GPIO_HIGH)
205 reg |= gpio;
206 else
207 reg &= ~gpio;
208
209 if (wm->id == WM9712_ID2)
210 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
211 else
212 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
213 mutex_unlock(&wm->codec_mutex);
214}
215EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
216
217/*
218 * Codec GPIO pin configuration, this sets pin direction, polarity,
219 * stickyness and wake up.
220 */
221void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
222 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
223 enum wm97xx_gpio_wake wake)
224{
225 u16 reg;
226
227 mutex_lock(&wm->codec_mutex);
228 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
229
230 if (pol == WM97XX_GPIO_POL_HIGH)
231 reg |= gpio;
232 else
233 reg &= ~gpio;
234
235 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
236 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
237
238 if (sticky == WM97XX_GPIO_STICKY)
239 reg |= gpio;
240 else
241 reg &= ~gpio;
242
243 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
244 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
245
246 if (wake == WM97XX_GPIO_WAKE)
247 reg |= gpio;
248 else
249 reg &= ~gpio;
250
251 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
252 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
253
254 if (dir == WM97XX_GPIO_IN)
255 reg |= gpio;
256 else
257 reg &= ~gpio;
258
259 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
260 mutex_unlock(&wm->codec_mutex);
261}
262EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
263
264/*
265 * Configure the WM97XX_PRP value to use while system is suspended.
266 * If a value other than 0 is set then WM97xx pen detection will be
267 * left enabled in the configured mode while the system is in suspend,
268 * the device has users and suspend has not been disabled via the
269 * wakeup sysfs entries.
270 *
271 * @wm: WM97xx device to configure
272 * @mode: WM97XX_PRP value to configure while suspended
273 */
274void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
275{
276 wm->suspend_mode = mode;
277 device_init_wakeup(&wm->input_dev->dev, mode != 0);
278}
279EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
280
281/*
282 * Handle a pen down interrupt.
283 */
284static void wm97xx_pen_irq_worker(struct work_struct *work)
285{
286 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
287 int pen_was_down = wm->pen_is_down;
288
289 /* do we need to enable the touch panel reader */
290 if (wm->id == WM9705_ID2) {
291 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
292 WM97XX_PEN_DOWN)
293 wm->pen_is_down = 1;
294 else
295 wm->pen_is_down = 0;
296 } else {
297 u16 status, pol;
298 mutex_lock(&wm->codec_mutex);
299 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
300 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
301
302 if (WM97XX_GPIO_13 & pol & status) {
303 wm->pen_is_down = 1;
304 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
305 ~WM97XX_GPIO_13);
306 } else {
307 wm->pen_is_down = 0;
308 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
309 WM97XX_GPIO_13);
310 }
311
312 if (wm->id == WM9712_ID2)
313 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
314 ~WM97XX_GPIO_13) << 1);
315 else
316 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
317 ~WM97XX_GPIO_13);
318 mutex_unlock(&wm->codec_mutex);
319 }
320
321 /* If the system is not using continuous mode or it provides a
322 * pen down operation then we need to schedule polls while the
323 * pen is down. Otherwise the machine driver is responsible
324 * for scheduling reads.
325 */
326 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
327 if (wm->pen_is_down && !pen_was_down) {
328 /* Data is not availiable immediately on pen down */
329 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
330 }
331
332 /* Let ts_reader report the pen up for debounce. */
333 if (!wm->pen_is_down && pen_was_down)
334 wm->pen_is_down = 1;
335 }
336
337 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
338 wm->mach_ops->acc_pen_up(wm);
339
340 wm->mach_ops->irq_enable(wm, 1);
341}
342
343/*
344 * Codec PENDOWN irq handler
345 *
346 * We have to disable the codec interrupt in the handler because it
347 * can take upto 1ms to clear the interrupt source. We schedule a task
348 * in a work queue to do the actual interaction with the chip. The
349 * interrupt is then enabled again in the slow handler when the source
350 * has been cleared.
351 */
352static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
353{
354 struct wm97xx *wm = dev_id;
355
356 if (!work_pending(&wm->pen_event_work)) {
357 wm->mach_ops->irq_enable(wm, 0);
358 queue_work(wm->ts_workq, &wm->pen_event_work);
359 }
360
361 return IRQ_HANDLED;
362}
363
364/*
365 * initialise pen IRQ handler and workqueue
366 */
367static int wm97xx_init_pen_irq(struct wm97xx *wm)
368{
369 u16 reg;
370
371 /* If an interrupt is supplied an IRQ enable operation must also be
372 * provided. */
373 BUG_ON(!wm->mach_ops->irq_enable);
374
375 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt,
376 IRQF_SHARED | IRQF_SAMPLE_RANDOM,
377 "wm97xx-pen", wm)) {
378 dev_err(wm->dev,
379 "Failed to register pen down interrupt, polling");
380 wm->pen_irq = 0;
381 return -EINVAL;
382 }
383
384 /* Configure GPIO as interrupt source on WM971x */
385 if (wm->id != WM9705_ID2) {
386 BUG_ON(!wm->mach_ops->irq_gpio);
387 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
388 wm97xx_reg_write(wm, AC97_MISC_AFE,
389 reg & ~(wm->mach_ops->irq_gpio));
390 reg = wm97xx_reg_read(wm, 0x5a);
391 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
392 }
393
394 return 0;
395}
396
397static int wm97xx_read_samples(struct wm97xx *wm)
398{
399 struct wm97xx_data data;
400 int rc;
401
402 mutex_lock(&wm->codec_mutex);
403
404 if (wm->mach_ops && wm->mach_ops->acc_enabled)
405 rc = wm->mach_ops->acc_pen_down(wm);
406 else
407 rc = wm->codec->poll_touch(wm, &data);
408
409 if (rc & RC_PENUP) {
410 if (wm->pen_is_down) {
411 wm->pen_is_down = 0;
412 dev_dbg(wm->dev, "pen up\n");
413 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
414 input_sync(wm->input_dev);
415 } else if (!(rc & RC_AGAIN)) {
416 /* We need high frequency updates only while
417 * pen is down, the user never will be able to
418 * touch screen faster than a few times per
419 * second... On the other hand, when the user
420 * is actively working with the touchscreen we
421 * don't want to lose the quick response. So we
422 * will slowly increase sleep time after the
423 * pen is up and quicky restore it to ~one task
424 * switch when pen is down again.
425 */
426 if (wm->ts_reader_interval < HZ / 10)
427 wm->ts_reader_interval++;
428 }
429
430 } else if (rc & RC_VALID) {
431 dev_dbg(wm->dev,
432 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
433 data.x >> 12, data.x & 0xfff, data.y >> 12,
434 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
435 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
436 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
437 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
438 input_sync(wm->input_dev);
439 wm->pen_is_down = 1;
440 wm->ts_reader_interval = wm->ts_reader_min_interval;
441 } else if (rc & RC_PENDOWN) {
442 dev_dbg(wm->dev, "pen down\n");
443 wm->pen_is_down = 1;
444 wm->ts_reader_interval = wm->ts_reader_min_interval;
445 }
446
447 mutex_unlock(&wm->codec_mutex);
448 return rc;
449}
450
451/*
452* The touchscreen sample reader.
453*/
454static void wm97xx_ts_reader(struct work_struct *work)
455{
456 int rc;
457 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
458
459 BUG_ON(!wm->codec);
460
461 do {
462 rc = wm97xx_read_samples(wm);
463 } while (rc & RC_AGAIN);
464
465 if (wm->pen_is_down || !wm->pen_irq)
466 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
467 wm->ts_reader_interval);
468}
469
470/**
471 * wm97xx_ts_input_open - Open the touch screen input device.
472 * @idev: Input device to be opened.
473 *
474 * Called by the input sub system to open a wm97xx touchscreen device.
475 * Starts the touchscreen thread and touch digitiser.
476 */
477static int wm97xx_ts_input_open(struct input_dev *idev)
478{
479 struct wm97xx *wm = input_get_drvdata(idev);
480
481 wm->ts_workq = create_singlethread_workqueue("kwm97xx");
482 if (wm->ts_workq == NULL) {
483 dev_err(wm->dev,
484 "Failed to create workqueue\n");
485 return -EINVAL;
486 }
487
488 /* start digitiser */
489 if (wm->mach_ops && wm->mach_ops->acc_enabled)
490 wm->codec->acc_enable(wm, 1);
491 wm->codec->dig_enable(wm, 1);
492
493 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
494 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
495
496 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
497 if (wm->ts_reader_min_interval < 1)
498 wm->ts_reader_min_interval = 1;
499 wm->ts_reader_interval = wm->ts_reader_min_interval;
500
501 wm->pen_is_down = 0;
502 if (wm->pen_irq)
503 wm97xx_init_pen_irq(wm);
504 else
505 dev_err(wm->dev, "No IRQ specified\n");
506
507 /* If we either don't have an interrupt for pen down events or
508 * failed to acquire it then we need to poll.
509 */
510 if (wm->pen_irq == 0)
511 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
512 wm->ts_reader_interval);
513
514 return 0;
515}
516
517/**
518 * wm97xx_ts_input_close - Close the touch screen input device.
519 * @idev: Input device to be closed.
520 *
521 * Called by the input sub system to close a wm97xx touchscreen
522 * device. Kills the touchscreen thread and stops the touch
523 * digitiser.
524 */
525
526static void wm97xx_ts_input_close(struct input_dev *idev)
527{
528 struct wm97xx *wm = input_get_drvdata(idev);
529 u16 reg;
530
531 if (wm->pen_irq) {
532 /* Return the interrupt to GPIO usage (disabling it) */
533 if (wm->id != WM9705_ID2) {
534 BUG_ON(!wm->mach_ops->irq_gpio);
535 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
536 wm97xx_reg_write(wm, AC97_MISC_AFE,
537 reg | wm->mach_ops->irq_gpio);
538 }
539
540 free_irq(wm->pen_irq, wm);
541 }
542
543 wm->pen_is_down = 0;
544
545 /* Balance out interrupt disables/enables */
546 if (cancel_work_sync(&wm->pen_event_work))
547 wm->mach_ops->irq_enable(wm, 1);
548
549 /* ts_reader rearms itself so we need to explicitly stop it
550 * before we destroy the workqueue.
551 */
552 cancel_delayed_work_sync(&wm->ts_reader);
553
554 destroy_workqueue(wm->ts_workq);
555
556 /* stop digitiser */
557 wm->codec->dig_enable(wm, 0);
558 if (wm->mach_ops && wm->mach_ops->acc_enabled)
559 wm->codec->acc_enable(wm, 0);
560}
561
562static int wm97xx_probe(struct device *dev)
563{
564 struct wm97xx *wm;
565 int ret = 0, id = 0;
566
567 wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL);
568 if (!wm)
569 return -ENOMEM;
570 mutex_init(&wm->codec_mutex);
571
572 wm->dev = dev;
573 dev->driver_data = wm;
574 wm->ac97 = to_ac97_t(dev);
575
576 /* check that we have a supported codec */
577 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
578 if (id != WM97XX_ID1) {
579 dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id);
580 ret = -ENODEV;
581 goto alloc_err;
582 }
583
584 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
585
586 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
587
588 switch (wm->id & 0xff) {
589#ifdef CONFIG_TOUCHSCREEN_WM9705
590 case 0x05:
591 wm->codec = &wm9705_codec;
592 break;
593#endif
594#ifdef CONFIG_TOUCHSCREEN_WM9712
595 case 0x12:
596 wm->codec = &wm9712_codec;
597 break;
598#endif
599#ifdef CONFIG_TOUCHSCREEN_WM9713
600 case 0x13:
601 wm->codec = &wm9713_codec;
602 break;
603#endif
604 default:
605 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
606 wm->id & 0xff);
607 ret = -ENODEV;
608 goto alloc_err;
609 }
610
611 wm->input_dev = input_allocate_device();
612 if (wm->input_dev == NULL) {
613 ret = -ENOMEM;
614 goto alloc_err;
615 }
616
617 /* set up touch configuration */
618 wm->input_dev->name = "wm97xx touchscreen";
619 wm->input_dev->open = wm97xx_ts_input_open;
620 wm->input_dev->close = wm97xx_ts_input_close;
621 set_bit(EV_ABS, wm->input_dev->evbit);
622 set_bit(ABS_X, wm->input_dev->absbit);
623 set_bit(ABS_Y, wm->input_dev->absbit);
624 set_bit(ABS_PRESSURE, wm->input_dev->absbit);
625 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
626 abs_x[2], 0);
627 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
628 abs_y[2], 0);
629 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
630 abs_p[2], 0);
631 input_set_drvdata(wm->input_dev, wm);
632 wm->input_dev->dev.parent = dev;
633 ret = input_register_device(wm->input_dev);
634 if (ret < 0)
635 goto dev_alloc_err;
636
637 /* set up physical characteristics */
638 wm->codec->phy_init(wm);
639
640 /* load gpio cache */
641 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
642 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
643 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
644 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
645 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
646 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
647
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);
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;
716
717 if (wm->input_dev->users)
718 cancel_delayed_work_sync(&wm->ts_reader);
719
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
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 = {
804 .name = "ac97",
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 */
827MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>");
828MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
829MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-01 02:22:09 -0400