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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 <lrg@slimlogic.co.uk>
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/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#include <linux/slab.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 int rc = 0;
129 int timeout = 0;
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;
148
149 while (rc != RC_VALID && timeout++ < 5)
150 rc = wm->codec->poll_sample(wm, adcsel, &auxval);
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
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
166 mutex_unlock(&wm->codec_mutex);
167 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
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
214 if (status == WM97XX_GPIO_HIGH)
215 reg |= gpio;
216 else
217 reg &= ~gpio;
218
219 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
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
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
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
322 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
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 available 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 up to 1ms to clear the interrupt source. We schedule a task
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.
361 */
362static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
363{
364 struct wm97xx *wm = dev_id;
365
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 }
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
385 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
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);
423 input_report_key(wm->input_dev, BTN_TOUCH, 0);
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);
448 input_report_key(wm->input_dev, BTN_TOUCH, 1);
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;
576 struct wm97xx_pdata *pdata = dev->platform_data;
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;
585 dev_set_drvdata(dev, wm);
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
598 wm->variant = WM97xx_GENERIC;
599
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
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
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";
644 wm->input_dev->phys = "wm97xx";
645 wm->input_dev->open = wm97xx_ts_input_open;
646 wm->input_dev->close = wm97xx_ts_input_close;
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
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);
658
659 input_set_drvdata(wm->input_dev, wm);
660 wm->input_dev->dev.parent = dev;
661
662 ret = input_register_device(wm->input_dev);
663 if (ret < 0)
664 goto dev_alloc_err;
665
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;
674 wm->battery_dev->dev.platform_data = pdata;
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;
688 wm->touch_dev->dev.platform_data = pdata;
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:
698 platform_device_del(wm->battery_dev);
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);
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;
735
736 if (wm->input_dev->users)
737 cancel_delayed_work_sync(&wm->ts_reader);
738
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
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 = {
823 .name = "wm97xx-ts",
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 */
846MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
847MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
848MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * wm97xx-core.c -- Touch screen driver core for Wolfson WM9705, WM9712
4 * and WM9713 AC97 Codecs.
5 *
6 * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
8 * Parts Copyright : Ian Molton <spyro@f2s.com>
9 * Andrew Zabolotny <zap@homelink.ru>
10 * Russell King <rmk@arm.linux.org.uk>
11 *
12 * Notes:
13 *
14 * Features:
15 * - supports WM9705, WM9712, WM9713
16 * - polling mode
17 * - continuous mode (arch-dependent)
18 * - adjustable rpu/dpp settings
19 * - adjustable pressure current
20 * - adjustable sample settle delay
21 * - 4 and 5 wire touchscreens (5 wire is WM9712 only)
22 * - pen down detection
23 * - battery monitor
24 * - sample AUX adcs
25 * - power management
26 * - codec GPIO
27 * - codec event notification
28 * Todo
29 * - Support for async sampling control for noisy LCDs.
30 */
31
32#include <linux/module.h>
33#include <linux/moduleparam.h>
34#include <linux/kernel.h>
35#include <linux/init.h>
36#include <linux/delay.h>
37#include <linux/string.h>
38#include <linux/proc_fs.h>
39#include <linux/pm.h>
40#include <linux/interrupt.h>
41#include <linux/bitops.h>
42#include <linux/mfd/wm97xx.h>
43#include <linux/workqueue.h>
44#include <linux/wm97xx.h>
45#include <linux/uaccess.h>
46#include <linux/io.h>
47#include <linux/slab.h>
48
49#define TS_NAME "wm97xx"
50#define WM_CORE_VERSION "1.00"
51#define DEFAULT_PRESSURE 0xb0c0
52
53
54/*
55 * Touchscreen absolute values
56 *
57 * These parameters are used to help the input layer discard out of
58 * range readings and reduce jitter etc.
59 *
60 * o min, max:- indicate the min and max values your touch screen returns
61 * o fuzz:- use a higher number to reduce jitter
62 *
63 * The default values correspond to Mainstone II in QVGA mode
64 *
65 * Please read
66 * Documentation/input/input-programming.rst for more details.
67 */
68
69static int abs_x[3] = {150, 4000, 5};
70module_param_array(abs_x, int, NULL, 0);
71MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
72
73static int abs_y[3] = {200, 4000, 40};
74module_param_array(abs_y, int, NULL, 0);
75MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
76
77static int abs_p[3] = {0, 150, 4};
78module_param_array(abs_p, int, NULL, 0);
79MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
80
81/*
82 * wm97xx IO access, all IO locking done by AC97 layer
83 */
84int wm97xx_reg_read(struct wm97xx *wm, u16 reg)
85{
86 if (wm->ac97)
87 return wm->ac97->bus->ops->read(wm->ac97, reg);
88 else
89 return -1;
90}
91EXPORT_SYMBOL_GPL(wm97xx_reg_read);
92
93void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val)
94{
95 /* cache digitiser registers */
96 if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3)
97 wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val;
98
99 /* cache gpio regs */
100 if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE)
101 wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val;
102
103 /* wm9713 irq reg */
104 if (reg == 0x5a)
105 wm->misc = val;
106
107 if (wm->ac97)
108 wm->ac97->bus->ops->write(wm->ac97, reg, val);
109}
110EXPORT_SYMBOL_GPL(wm97xx_reg_write);
111
112/**
113 * wm97xx_read_aux_adc - Read the aux adc.
114 * @wm: wm97xx device.
115 * @adcsel: codec ADC to be read
116 *
117 * Reads the selected AUX ADC.
118 */
119
120int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
121{
122 int power_adc = 0, auxval;
123 u16 power = 0;
124 int rc = 0;
125 int timeout = 0;
126
127 /* get codec */
128 mutex_lock(&wm->codec_mutex);
129
130 /* When the touchscreen is not in use, we may have to power up
131 * the AUX ADC before we can use sample the AUX inputs->
132 */
133 if (wm->id == WM9713_ID2 &&
134 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
135 power_adc = 1;
136 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
137 }
138
139 /* Prepare the codec for AUX reading */
140 wm->codec->aux_prepare(wm);
141
142 /* Turn polling mode on to read AUX ADC */
143 wm->pen_probably_down = 1;
144
145 while (rc != RC_VALID && timeout++ < 5)
146 rc = 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 if (timeout >= 5) {
156 dev_err(wm->dev,
157 "timeout reading auxadc %d, disabling digitiser\n",
158 adcsel);
159 wm->codec->dig_enable(wm, false);
160 }
161
162 mutex_unlock(&wm->codec_mutex);
163 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
164}
165EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
166
167/**
168 * wm97xx_get_gpio - Get the status of a codec GPIO.
169 * @wm: wm97xx device.
170 * @gpio: gpio
171 *
172 * Get the status of a codec GPIO pin
173 */
174
175enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
176{
177 u16 status;
178 enum wm97xx_gpio_status ret;
179
180 mutex_lock(&wm->codec_mutex);
181 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
182
183 if (status & gpio)
184 ret = WM97XX_GPIO_HIGH;
185 else
186 ret = WM97XX_GPIO_LOW;
187
188 mutex_unlock(&wm->codec_mutex);
189 return ret;
190}
191EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
192
193/**
194 * wm97xx_set_gpio - Set the status of a codec GPIO.
195 * @wm: wm97xx device.
196 * @gpio: gpio
197 * @status: status
198 *
199 * Set the status of a codec GPIO pin
200 */
201
202void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
203 enum wm97xx_gpio_status status)
204{
205 u16 reg;
206
207 mutex_lock(&wm->codec_mutex);
208 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
209
210 if (status == WM97XX_GPIO_HIGH)
211 reg |= gpio;
212 else
213 reg &= ~gpio;
214
215 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
216 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
217 else
218 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
219 mutex_unlock(&wm->codec_mutex);
220}
221EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
222
223/*
224 * Codec GPIO pin configuration, this sets pin direction, polarity,
225 * stickyness and wake up.
226 */
227void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
228 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
229 enum wm97xx_gpio_wake wake)
230{
231 u16 reg;
232
233 mutex_lock(&wm->codec_mutex);
234 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
235
236 if (pol == WM97XX_GPIO_POL_HIGH)
237 reg |= gpio;
238 else
239 reg &= ~gpio;
240
241 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
242 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
243
244 if (sticky == WM97XX_GPIO_STICKY)
245 reg |= gpio;
246 else
247 reg &= ~gpio;
248
249 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
250 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
251
252 if (wake == WM97XX_GPIO_WAKE)
253 reg |= gpio;
254 else
255 reg &= ~gpio;
256
257 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
258 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
259
260 if (dir == WM97XX_GPIO_IN)
261 reg |= gpio;
262 else
263 reg &= ~gpio;
264
265 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
266 mutex_unlock(&wm->codec_mutex);
267}
268EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
269
270/*
271 * Configure the WM97XX_PRP value to use while system is suspended.
272 * If a value other than 0 is set then WM97xx pen detection will be
273 * left enabled in the configured mode while the system is in suspend,
274 * the device has users and suspend has not been disabled via the
275 * wakeup sysfs entries.
276 *
277 * @wm: WM97xx device to configure
278 * @mode: WM97XX_PRP value to configure while suspended
279 */
280void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
281{
282 wm->suspend_mode = mode;
283 device_init_wakeup(&wm->input_dev->dev, mode != 0);
284}
285EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
286
287/*
288 * Handle a pen down interrupt.
289 */
290static void wm97xx_pen_irq_worker(struct work_struct *work)
291{
292 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
293 int pen_was_down = wm->pen_is_down;
294
295 /* do we need to enable the touch panel reader */
296 if (wm->id == WM9705_ID2) {
297 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
298 WM97XX_PEN_DOWN)
299 wm->pen_is_down = 1;
300 else
301 wm->pen_is_down = 0;
302 } else {
303 u16 status, pol;
304 mutex_lock(&wm->codec_mutex);
305 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
306 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
307
308 if (WM97XX_GPIO_13 & pol & status) {
309 wm->pen_is_down = 1;
310 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
311 ~WM97XX_GPIO_13);
312 } else {
313 wm->pen_is_down = 0;
314 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
315 WM97XX_GPIO_13);
316 }
317
318 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
319 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
320 ~WM97XX_GPIO_13) << 1);
321 else
322 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
323 ~WM97XX_GPIO_13);
324 mutex_unlock(&wm->codec_mutex);
325 }
326
327 /* If the system is not using continuous mode or it provides a
328 * pen down operation then we need to schedule polls while the
329 * pen is down. Otherwise the machine driver is responsible
330 * for scheduling reads.
331 */
332 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
333 if (wm->pen_is_down && !pen_was_down) {
334 /* Data is not available immediately on pen down */
335 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
336 }
337
338 /* Let ts_reader report the pen up for debounce. */
339 if (!wm->pen_is_down && pen_was_down)
340 wm->pen_is_down = 1;
341 }
342
343 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
344 wm->mach_ops->acc_pen_up(wm);
345
346 wm->mach_ops->irq_enable(wm, 1);
347}
348
349/*
350 * Codec PENDOWN irq handler
351 *
352 * We have to disable the codec interrupt in the handler because it
353 * can take up to 1ms to clear the interrupt source. We schedule a task
354 * in a work queue to do the actual interaction with the chip. The
355 * interrupt is then enabled again in the slow handler when the source
356 * has been cleared.
357 */
358static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
359{
360 struct wm97xx *wm = dev_id;
361
362 if (!work_pending(&wm->pen_event_work)) {
363 wm->mach_ops->irq_enable(wm, 0);
364 queue_work(wm->ts_workq, &wm->pen_event_work);
365 }
366
367 return IRQ_HANDLED;
368}
369
370/*
371 * initialise pen IRQ handler and workqueue
372 */
373static int wm97xx_init_pen_irq(struct wm97xx *wm)
374{
375 u16 reg;
376
377 /* If an interrupt is supplied an IRQ enable operation must also be
378 * provided. */
379 BUG_ON(!wm->mach_ops->irq_enable);
380
381 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
382 "wm97xx-pen", wm)) {
383 dev_err(wm->dev,
384 "Failed to register pen down interrupt, polling");
385 wm->pen_irq = 0;
386 return -EINVAL;
387 }
388
389 /* Configure GPIO as interrupt source on WM971x */
390 if (wm->id != WM9705_ID2) {
391 BUG_ON(!wm->mach_ops->irq_gpio);
392 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
393 wm97xx_reg_write(wm, AC97_MISC_AFE,
394 reg & ~(wm->mach_ops->irq_gpio));
395 reg = wm97xx_reg_read(wm, 0x5a);
396 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
397 }
398
399 return 0;
400}
401
402static int wm97xx_read_samples(struct wm97xx *wm)
403{
404 struct wm97xx_data data;
405 int rc;
406
407 mutex_lock(&wm->codec_mutex);
408
409 if (wm->mach_ops && wm->mach_ops->acc_enabled)
410 rc = wm->mach_ops->acc_pen_down(wm);
411 else
412 rc = wm->codec->poll_touch(wm, &data);
413
414 if (rc & RC_PENUP) {
415 if (wm->pen_is_down) {
416 wm->pen_is_down = 0;
417 dev_dbg(wm->dev, "pen up\n");
418 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
419 input_report_key(wm->input_dev, BTN_TOUCH, 0);
420 input_sync(wm->input_dev);
421 } else if (!(rc & RC_AGAIN)) {
422 /* We need high frequency updates only while
423 * pen is down, the user never will be able to
424 * touch screen faster than a few times per
425 * second... On the other hand, when the user
426 * is actively working with the touchscreen we
427 * don't want to lose the quick response. So we
428 * will slowly increase sleep time after the
429 * pen is up and quicky restore it to ~one task
430 * switch when pen is down again.
431 */
432 if (wm->ts_reader_interval < HZ / 10)
433 wm->ts_reader_interval++;
434 }
435
436 } else if (rc & RC_VALID) {
437 dev_dbg(wm->dev,
438 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
439 data.x >> 12, data.x & 0xfff, data.y >> 12,
440 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
441
442 if (abs_x[0] > (data.x & 0xfff) ||
443 abs_x[1] < (data.x & 0xfff) ||
444 abs_y[0] > (data.y & 0xfff) ||
445 abs_y[1] < (data.y & 0xfff)) {
446 dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
447 rc = RC_AGAIN;
448 goto out;
449 }
450
451 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
452 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
453 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
454 input_report_key(wm->input_dev, BTN_TOUCH, 1);
455 input_sync(wm->input_dev);
456 wm->pen_is_down = 1;
457 wm->ts_reader_interval = wm->ts_reader_min_interval;
458 } else if (rc & RC_PENDOWN) {
459 dev_dbg(wm->dev, "pen down\n");
460 wm->pen_is_down = 1;
461 wm->ts_reader_interval = wm->ts_reader_min_interval;
462 }
463
464out:
465 mutex_unlock(&wm->codec_mutex);
466 return rc;
467}
468
469/*
470* The touchscreen sample reader.
471*/
472static void wm97xx_ts_reader(struct work_struct *work)
473{
474 int rc;
475 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
476
477 BUG_ON(!wm->codec);
478
479 do {
480 rc = wm97xx_read_samples(wm);
481 } while (rc & RC_AGAIN);
482
483 if (wm->pen_is_down || !wm->pen_irq)
484 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
485 wm->ts_reader_interval);
486}
487
488/**
489 * wm97xx_ts_input_open - Open the touch screen input device.
490 * @idev: Input device to be opened.
491 *
492 * Called by the input sub system to open a wm97xx touchscreen device.
493 * Starts the touchscreen thread and touch digitiser.
494 */
495static int wm97xx_ts_input_open(struct input_dev *idev)
496{
497 struct wm97xx *wm = input_get_drvdata(idev);
498
499 wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0);
500 if (wm->ts_workq == NULL) {
501 dev_err(wm->dev,
502 "Failed to create workqueue\n");
503 return -EINVAL;
504 }
505
506 /* start digitiser */
507 if (wm->mach_ops && wm->mach_ops->acc_enabled)
508 wm->codec->acc_enable(wm, 1);
509 wm->codec->dig_enable(wm, 1);
510
511 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
512 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
513
514 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
515 if (wm->ts_reader_min_interval < 1)
516 wm->ts_reader_min_interval = 1;
517 wm->ts_reader_interval = wm->ts_reader_min_interval;
518
519 wm->pen_is_down = 0;
520 if (wm->pen_irq)
521 wm97xx_init_pen_irq(wm);
522 else
523 dev_err(wm->dev, "No IRQ specified\n");
524
525 /* If we either don't have an interrupt for pen down events or
526 * failed to acquire it then we need to poll.
527 */
528 if (wm->pen_irq == 0)
529 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
530 wm->ts_reader_interval);
531
532 return 0;
533}
534
535/**
536 * wm97xx_ts_input_close - Close the touch screen input device.
537 * @idev: Input device to be closed.
538 *
539 * Called by the input sub system to close a wm97xx touchscreen
540 * device. Kills the touchscreen thread and stops the touch
541 * digitiser.
542 */
543
544static void wm97xx_ts_input_close(struct input_dev *idev)
545{
546 struct wm97xx *wm = input_get_drvdata(idev);
547 u16 reg;
548
549 if (wm->pen_irq) {
550 /* Return the interrupt to GPIO usage (disabling it) */
551 if (wm->id != WM9705_ID2) {
552 BUG_ON(!wm->mach_ops->irq_gpio);
553 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
554 wm97xx_reg_write(wm, AC97_MISC_AFE,
555 reg | wm->mach_ops->irq_gpio);
556 }
557
558 free_irq(wm->pen_irq, wm);
559 }
560
561 wm->pen_is_down = 0;
562
563 /* Balance out interrupt disables/enables */
564 if (cancel_work_sync(&wm->pen_event_work))
565 wm->mach_ops->irq_enable(wm, 1);
566
567 /* ts_reader rearms itself so we need to explicitly stop it
568 * before we destroy the workqueue.
569 */
570 cancel_delayed_work_sync(&wm->ts_reader);
571
572 destroy_workqueue(wm->ts_workq);
573
574 /* stop digitiser */
575 wm->codec->dig_enable(wm, 0);
576 if (wm->mach_ops && wm->mach_ops->acc_enabled)
577 wm->codec->acc_enable(wm, 0);
578}
579
580static int wm97xx_register_touch(struct wm97xx *wm)
581{
582 struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev);
583 int ret;
584
585 wm->input_dev = devm_input_allocate_device(wm->dev);
586 if (wm->input_dev == NULL)
587 return -ENOMEM;
588
589 /* set up touch configuration */
590 wm->input_dev->name = "wm97xx touchscreen";
591 wm->input_dev->phys = "wm97xx";
592 wm->input_dev->open = wm97xx_ts_input_open;
593 wm->input_dev->close = wm97xx_ts_input_close;
594
595 __set_bit(EV_ABS, wm->input_dev->evbit);
596 __set_bit(EV_KEY, wm->input_dev->evbit);
597 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
598
599 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
600 abs_x[2], 0);
601 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
602 abs_y[2], 0);
603 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
604 abs_p[2], 0);
605
606 input_set_drvdata(wm->input_dev, wm);
607 wm->input_dev->dev.parent = wm->dev;
608
609 ret = input_register_device(wm->input_dev);
610 if (ret)
611 return ret;
612
613 /*
614 * register our extended touch device (for machine specific
615 * extensions)
616 */
617 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
618 if (!wm->touch_dev) {
619 ret = -ENOMEM;
620 goto touch_err;
621 }
622 platform_set_drvdata(wm->touch_dev, wm);
623 wm->touch_dev->dev.parent = wm->dev;
624 wm->touch_dev->dev.platform_data = pdata;
625 ret = platform_device_add(wm->touch_dev);
626 if (ret < 0)
627 goto touch_reg_err;
628
629 return 0;
630touch_reg_err:
631 platform_device_put(wm->touch_dev);
632touch_err:
633 input_unregister_device(wm->input_dev);
634 wm->input_dev = NULL;
635
636 return ret;
637}
638
639static void wm97xx_unregister_touch(struct wm97xx *wm)
640{
641 platform_device_unregister(wm->touch_dev);
642 input_unregister_device(wm->input_dev);
643 wm->input_dev = NULL;
644}
645
646static int _wm97xx_probe(struct wm97xx *wm)
647{
648 int id = 0;
649
650 mutex_init(&wm->codec_mutex);
651 dev_set_drvdata(wm->dev, wm);
652
653 /* check that we have a supported codec */
654 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
655 if (id != WM97XX_ID1) {
656 dev_err(wm->dev,
657 "Device with vendor %04x is not a wm97xx\n", id);
658 return -ENODEV;
659 }
660
661 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
662
663 wm->variant = WM97xx_GENERIC;
664
665 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
666
667 switch (wm->id & 0xff) {
668#ifdef CONFIG_TOUCHSCREEN_WM9705
669 case 0x05:
670 wm->codec = &wm9705_codec;
671 break;
672#endif
673#ifdef CONFIG_TOUCHSCREEN_WM9712
674 case 0x12:
675 wm->codec = &wm9712_codec;
676 break;
677#endif
678#ifdef CONFIG_TOUCHSCREEN_WM9713
679 case 0x13:
680 wm->codec = &wm9713_codec;
681 break;
682#endif
683 default:
684 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
685 wm->id & 0xff);
686 return -ENODEV;
687 }
688
689 /* set up physical characteristics */
690 wm->codec->phy_init(wm);
691
692 /* load gpio cache */
693 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
694 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
695 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
696 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
697 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
698 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
699
700 return wm97xx_register_touch(wm);
701}
702
703static void wm97xx_remove_battery(struct wm97xx *wm)
704{
705 platform_device_unregister(wm->battery_dev);
706}
707
708static int wm97xx_add_battery(struct wm97xx *wm,
709 struct wm97xx_batt_pdata *pdata)
710{
711 int ret;
712
713 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
714 if (!wm->battery_dev)
715 return -ENOMEM;
716
717 platform_set_drvdata(wm->battery_dev, wm);
718 wm->battery_dev->dev.parent = wm->dev;
719 wm->battery_dev->dev.platform_data = pdata;
720 ret = platform_device_add(wm->battery_dev);
721 if (ret)
722 platform_device_put(wm->battery_dev);
723
724 return ret;
725}
726
727static int wm97xx_probe(struct device *dev)
728{
729 struct wm97xx *wm;
730 int ret;
731 struct wm97xx_pdata *pdata = dev_get_platdata(dev);
732
733 wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL);
734 if (!wm)
735 return -ENOMEM;
736
737 wm->dev = dev;
738 wm->ac97 = to_ac97_t(dev);
739
740 ret = _wm97xx_probe(wm);
741 if (ret)
742 return ret;
743
744 ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL);
745 if (ret < 0)
746 goto batt_err;
747
748 return ret;
749
750batt_err:
751 wm97xx_unregister_touch(wm);
752 return ret;
753}
754
755static int wm97xx_remove(struct device *dev)
756{
757 struct wm97xx *wm = dev_get_drvdata(dev);
758
759 wm97xx_remove_battery(wm);
760 wm97xx_unregister_touch(wm);
761
762 return 0;
763}
764
765static int wm97xx_mfd_probe(struct platform_device *pdev)
766{
767 struct wm97xx *wm;
768 struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev);
769 int ret;
770
771 wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL);
772 if (!wm)
773 return -ENOMEM;
774
775 wm->dev = &pdev->dev;
776 wm->ac97 = mfd_pdata->ac97;
777
778 ret = _wm97xx_probe(wm);
779 if (ret)
780 return ret;
781
782 ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata);
783 if (ret < 0)
784 goto batt_err;
785
786 return ret;
787
788batt_err:
789 wm97xx_unregister_touch(wm);
790 return ret;
791}
792
793static int wm97xx_mfd_remove(struct platform_device *pdev)
794{
795 return wm97xx_remove(&pdev->dev);
796}
797
798static int __maybe_unused wm97xx_suspend(struct device *dev)
799{
800 struct wm97xx *wm = dev_get_drvdata(dev);
801 u16 reg;
802 int suspend_mode;
803
804 if (device_may_wakeup(&wm->input_dev->dev))
805 suspend_mode = wm->suspend_mode;
806 else
807 suspend_mode = 0;
808
809 mutex_lock(&wm->input_dev->mutex);
810 if (input_device_enabled(wm->input_dev))
811 cancel_delayed_work_sync(&wm->ts_reader);
812
813 /* Power down the digitiser (bypassing the cache for resume) */
814 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
815 reg &= ~WM97XX_PRP_DET_DIG;
816 if (input_device_enabled(wm->input_dev))
817 reg |= suspend_mode;
818 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
819
820 /* WM9713 has an additional power bit - turn it off if there
821 * are no users or if suspend mode is zero. */
822 if (wm->id == WM9713_ID2 &&
823 (!input_device_enabled(wm->input_dev) || !suspend_mode)) {
824 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
825 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
826 }
827 mutex_unlock(&wm->input_dev->mutex);
828
829 return 0;
830}
831
832static int __maybe_unused wm97xx_resume(struct device *dev)
833{
834 struct wm97xx *wm = dev_get_drvdata(dev);
835
836 mutex_lock(&wm->input_dev->mutex);
837 /* restore digitiser and gpios */
838 if (wm->id == WM9713_ID2) {
839 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
840 wm97xx_reg_write(wm, 0x5a, wm->misc);
841 if (input_device_enabled(wm->input_dev)) {
842 u16 reg;
843 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
844 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
845 }
846 }
847
848 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
849 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
850
851 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
852 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
853 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
854 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
855 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
856 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
857
858 if (input_device_enabled(wm->input_dev) && !wm->pen_irq) {
859 wm->ts_reader_interval = wm->ts_reader_min_interval;
860 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
861 wm->ts_reader_interval);
862 }
863 mutex_unlock(&wm->input_dev->mutex);
864
865 return 0;
866}
867
868static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
869
870/*
871 * Machine specific operations
872 */
873int wm97xx_register_mach_ops(struct wm97xx *wm,
874 struct wm97xx_mach_ops *mach_ops)
875{
876 mutex_lock(&wm->codec_mutex);
877 if (wm->mach_ops) {
878 mutex_unlock(&wm->codec_mutex);
879 return -EINVAL;
880 }
881 wm->mach_ops = mach_ops;
882 mutex_unlock(&wm->codec_mutex);
883
884 return 0;
885}
886EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
887
888void wm97xx_unregister_mach_ops(struct wm97xx *wm)
889{
890 mutex_lock(&wm->codec_mutex);
891 wm->mach_ops = NULL;
892 mutex_unlock(&wm->codec_mutex);
893}
894EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
895
896static struct device_driver wm97xx_driver = {
897 .name = "wm97xx-ts",
898#ifdef CONFIG_AC97_BUS
899 .bus = &ac97_bus_type,
900#endif
901 .owner = THIS_MODULE,
902 .probe = wm97xx_probe,
903 .remove = wm97xx_remove,
904 .pm = &wm97xx_pm_ops,
905};
906
907static struct platform_driver wm97xx_mfd_driver = {
908 .driver = {
909 .name = "wm97xx-ts",
910 .pm = &wm97xx_pm_ops,
911 },
912 .probe = wm97xx_mfd_probe,
913 .remove = wm97xx_mfd_remove,
914};
915
916static int __init wm97xx_init(void)
917{
918 int ret;
919
920 ret = platform_driver_register(&wm97xx_mfd_driver);
921 if (ret)
922 return ret;
923
924 if (IS_BUILTIN(CONFIG_AC97_BUS))
925 ret = driver_register(&wm97xx_driver);
926 return ret;
927}
928
929static void __exit wm97xx_exit(void)
930{
931 if (IS_BUILTIN(CONFIG_AC97_BUS))
932 driver_unregister(&wm97xx_driver);
933 platform_driver_unregister(&wm97xx_mfd_driver);
934}
935
936module_init(wm97xx_init);
937module_exit(wm97xx_exit);
938
939/* Module information */
940MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
941MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
942MODULE_LICENSE("GPL");