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Linux 5.1.15
[linux/fpc-iii.git] / drivers / input / touchscreen / wm97xx-core.c
blob73856c2a8ac0f8dba61e72853e5b4f2e839c8487
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/mfd/wm97xx.h>
48 #include <linux/workqueue.h>
49 #include <linux/wm97xx.h>
50 #include <linux/uaccess.h>
51 #include <linux/io.h>
52 #include <linux/slab.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.rst for more details.
72 */
73
74 static int abs_x[3] = {150, 4000, 5};
75 module_param_array(abs_x, int, NULL, 0);
76 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
77
78 static int abs_y[3] = {200, 4000, 40};
79 module_param_array(abs_y, int, NULL, 0);
80 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
81
82 static int abs_p[3] = {0, 150, 4};
83 module_param_array(abs_p, int, NULL, 0);
84 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
85
86 /*
87 * wm97xx IO access, all IO locking done by AC97 layer
88 */
89 int 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 }
96 EXPORT_SYMBOL_GPL(wm97xx_reg_read);
97
98 void 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 }
115 EXPORT_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
125 int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel)
126 {
127 int power_adc = 0, auxval;
128 u16 power = 0;
129 int rc = 0;
130 int timeout = 0;
131
132 /* get codec */
133 mutex_lock(&wm->codec_mutex);
134
135 /* When the touchscreen is not in use, we may have to power up
136 * the AUX ADC before we can use sample the AUX inputs->
137 */
138 if (wm->id == WM9713_ID2 &&
139 (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) {
140 power_adc = 1;
141 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff);
142 }
143
144 /* Prepare the codec for AUX reading */
145 wm->codec->aux_prepare(wm);
146
147 /* Turn polling mode on to read AUX ADC */
148 wm->pen_probably_down = 1;
149
150 while (rc != RC_VALID && timeout++ < 5)
151 rc = wm->codec->poll_sample(wm, adcsel, &auxval);
152
153 if (power_adc)
154 wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000);
155
156 wm->codec->dig_restore(wm);
157
158 wm->pen_probably_down = 0;
159
160 if (timeout >= 5) {
161 dev_err(wm->dev,
162 "timeout reading auxadc %d, disabling digitiser\n",
163 adcsel);
164 wm->codec->dig_enable(wm, false);
165 }
166
167 mutex_unlock(&wm->codec_mutex);
168 return (rc == RC_VALID ? auxval & 0xfff : -EBUSY);
169 }
170 EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc);
171
172 /**
173 * wm97xx_get_gpio - Get the status of a codec GPIO.
174 * @wm: wm97xx device.
175 * @gpio: gpio
176 *
177 * Get the status of a codec GPIO pin
178 */
179
180 enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio)
181 {
182 u16 status;
183 enum wm97xx_gpio_status ret;
184
185 mutex_lock(&wm->codec_mutex);
186 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
187
188 if (status & gpio)
189 ret = WM97XX_GPIO_HIGH;
190 else
191 ret = WM97XX_GPIO_LOW;
192
193 mutex_unlock(&wm->codec_mutex);
194 return ret;
195 }
196 EXPORT_SYMBOL_GPL(wm97xx_get_gpio);
197
198 /**
199 * wm97xx_set_gpio - Set the status of a codec GPIO.
200 * @wm: wm97xx device.
201 * @gpio: gpio
202 *
203 *
204 * Set the status of a codec GPIO pin
205 */
206
207 void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio,
208 enum wm97xx_gpio_status status)
209 {
210 u16 reg;
211
212 mutex_lock(&wm->codec_mutex);
213 reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
214
215 if (status == WM97XX_GPIO_HIGH)
216 reg |= gpio;
217 else
218 reg &= ~gpio;
219
220 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
221 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1);
222 else
223 wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg);
224 mutex_unlock(&wm->codec_mutex);
225 }
226 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
227
228 /*
229 * Codec GPIO pin configuration, this sets pin direction, polarity,
230 * stickyness and wake up.
231 */
232 void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir,
233 enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky,
234 enum wm97xx_gpio_wake wake)
235 {
236 u16 reg;
237
238 mutex_lock(&wm->codec_mutex);
239 reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
240
241 if (pol == WM97XX_GPIO_POL_HIGH)
242 reg |= gpio;
243 else
244 reg &= ~gpio;
245
246 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg);
247 reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
248
249 if (sticky == WM97XX_GPIO_STICKY)
250 reg |= gpio;
251 else
252 reg &= ~gpio;
253
254 wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg);
255 reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
256
257 if (wake == WM97XX_GPIO_WAKE)
258 reg |= gpio;
259 else
260 reg &= ~gpio;
261
262 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg);
263 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
264
265 if (dir == WM97XX_GPIO_IN)
266 reg |= gpio;
267 else
268 reg &= ~gpio;
269
270 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg);
271 mutex_unlock(&wm->codec_mutex);
272 }
273 EXPORT_SYMBOL_GPL(wm97xx_config_gpio);
274
275 /*
276 * Configure the WM97XX_PRP value to use while system is suspended.
277 * If a value other than 0 is set then WM97xx pen detection will be
278 * left enabled in the configured mode while the system is in suspend,
279 * the device has users and suspend has not been disabled via the
280 * wakeup sysfs entries.
281 *
282 * @wm: WM97xx device to configure
283 * @mode: WM97XX_PRP value to configure while suspended
284 */
285 void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
286 {
287 wm->suspend_mode = mode;
288 device_init_wakeup(&wm->input_dev->dev, mode != 0);
289 }
290 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
291
292 /*
293 * Handle a pen down interrupt.
294 */
295 static void wm97xx_pen_irq_worker(struct work_struct *work)
296 {
297 struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
298 int pen_was_down = wm->pen_is_down;
299
300 /* do we need to enable the touch panel reader */
301 if (wm->id == WM9705_ID2) {
302 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
303 WM97XX_PEN_DOWN)
304 wm->pen_is_down = 1;
305 else
306 wm->pen_is_down = 0;
307 } else {
308 u16 status, pol;
309 mutex_lock(&wm->codec_mutex);
310 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
311 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
312
313 if (WM97XX_GPIO_13 & pol & status) {
314 wm->pen_is_down = 1;
315 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
316 ~WM97XX_GPIO_13);
317 } else {
318 wm->pen_is_down = 0;
319 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
320 WM97XX_GPIO_13);
321 }
322
323 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
324 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
325 ~WM97XX_GPIO_13) << 1);
326 else
327 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
328 ~WM97XX_GPIO_13);
329 mutex_unlock(&wm->codec_mutex);
330 }
331
332 /* If the system is not using continuous mode or it provides a
333 * pen down operation then we need to schedule polls while the
334 * pen is down. Otherwise the machine driver is responsible
335 * for scheduling reads.
336 */
337 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
338 if (wm->pen_is_down && !pen_was_down) {
339 /* Data is not available immediately on pen down */
340 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
341 }
342
343 /* Let ts_reader report the pen up for debounce. */
344 if (!wm->pen_is_down && pen_was_down)
345 wm->pen_is_down = 1;
346 }
347
348 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
349 wm->mach_ops->acc_pen_up(wm);
350
351 wm->mach_ops->irq_enable(wm, 1);
352 }
353
354 /*
355 * Codec PENDOWN irq handler
356 *
357 * We have to disable the codec interrupt in the handler because it
358 * can take up to 1ms to clear the interrupt source. We schedule a task
359 * in a work queue to do the actual interaction with the chip. The
360 * interrupt is then enabled again in the slow handler when the source
361 * has been cleared.
362 */
363 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
364 {
365 struct wm97xx *wm = dev_id;
366
367 if (!work_pending(&wm->pen_event_work)) {
368 wm->mach_ops->irq_enable(wm, 0);
369 queue_work(wm->ts_workq, &wm->pen_event_work);
370 }
371
372 return IRQ_HANDLED;
373 }
374
375 /*
376 * initialise pen IRQ handler and workqueue
377 */
378 static int wm97xx_init_pen_irq(struct wm97xx *wm)
379 {
380 u16 reg;
381
382 /* If an interrupt is supplied an IRQ enable operation must also be
383 * provided. */
384 BUG_ON(!wm->mach_ops->irq_enable);
385
386 if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
387 "wm97xx-pen", wm)) {
388 dev_err(wm->dev,
389 "Failed to register pen down interrupt, polling");
390 wm->pen_irq = 0;
391 return -EINVAL;
392 }
393
394 /* Configure GPIO as interrupt source on WM971x */
395 if (wm->id != WM9705_ID2) {
396 BUG_ON(!wm->mach_ops->irq_gpio);
397 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
398 wm97xx_reg_write(wm, AC97_MISC_AFE,
399 reg & ~(wm->mach_ops->irq_gpio));
400 reg = wm97xx_reg_read(wm, 0x5a);
401 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
402 }
403
404 return 0;
405 }
406
407 static int wm97xx_read_samples(struct wm97xx *wm)
408 {
409 struct wm97xx_data data;
410 int rc;
411
412 mutex_lock(&wm->codec_mutex);
413
414 if (wm->mach_ops && wm->mach_ops->acc_enabled)
415 rc = wm->mach_ops->acc_pen_down(wm);
416 else
417 rc = wm->codec->poll_touch(wm, &data);
418
419 if (rc & RC_PENUP) {
420 if (wm->pen_is_down) {
421 wm->pen_is_down = 0;
422 dev_dbg(wm->dev, "pen up\n");
423 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
424 input_report_key(wm->input_dev, BTN_TOUCH, 0);
425 input_sync(wm->input_dev);
426 } else if (!(rc & RC_AGAIN)) {
427 /* We need high frequency updates only while
428 * pen is down, the user never will be able to
429 * touch screen faster than a few times per
430 * second... On the other hand, when the user
431 * is actively working with the touchscreen we
432 * don't want to lose the quick response. So we
433 * will slowly increase sleep time after the
434 * pen is up and quicky restore it to ~one task
435 * switch when pen is down again.
436 */
437 if (wm->ts_reader_interval < HZ / 10)
438 wm->ts_reader_interval++;
439 }
440
441 } else if (rc & RC_VALID) {
442 dev_dbg(wm->dev,
443 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
444 data.x >> 12, data.x & 0xfff, data.y >> 12,
445 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
446
447 if (abs_x[0] > (data.x & 0xfff) ||
448 abs_x[1] < (data.x & 0xfff) ||
449 abs_y[0] > (data.y & 0xfff) ||
450 abs_y[1] < (data.y & 0xfff)) {
451 dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
452 rc = RC_AGAIN;
453 goto out;
454 }
455
456 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
457 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
458 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
459 input_report_key(wm->input_dev, BTN_TOUCH, 1);
460 input_sync(wm->input_dev);
461 wm->pen_is_down = 1;
462 wm->ts_reader_interval = wm->ts_reader_min_interval;
463 } else if (rc & RC_PENDOWN) {
464 dev_dbg(wm->dev, "pen down\n");
465 wm->pen_is_down = 1;
466 wm->ts_reader_interval = wm->ts_reader_min_interval;
467 }
468
469 out:
470 mutex_unlock(&wm->codec_mutex);
471 return rc;
472 }
473
474 /*
475 * The touchscreen sample reader.
476 */
477 static void wm97xx_ts_reader(struct work_struct *work)
478 {
479 int rc;
480 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
481
482 BUG_ON(!wm->codec);
483
484 do {
485 rc = wm97xx_read_samples(wm);
486 } while (rc & RC_AGAIN);
487
488 if (wm->pen_is_down || !wm->pen_irq)
489 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
490 wm->ts_reader_interval);
491 }
492
493 /**
494 * wm97xx_ts_input_open - Open the touch screen input device.
495 * @idev: Input device to be opened.
496 *
497 * Called by the input sub system to open a wm97xx touchscreen device.
498 * Starts the touchscreen thread and touch digitiser.
499 */
500 static int wm97xx_ts_input_open(struct input_dev *idev)
501 {
502 struct wm97xx *wm = input_get_drvdata(idev);
503
504 wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0);
505 if (wm->ts_workq == NULL) {
506 dev_err(wm->dev,
507 "Failed to create workqueue\n");
508 return -EINVAL;
509 }
510
511 /* start digitiser */
512 if (wm->mach_ops && wm->mach_ops->acc_enabled)
513 wm->codec->acc_enable(wm, 1);
514 wm->codec->dig_enable(wm, 1);
515
516 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
517 INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
518
519 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
520 if (wm->ts_reader_min_interval < 1)
521 wm->ts_reader_min_interval = 1;
522 wm->ts_reader_interval = wm->ts_reader_min_interval;
523
524 wm->pen_is_down = 0;
525 if (wm->pen_irq)
526 wm97xx_init_pen_irq(wm);
527 else
528 dev_err(wm->dev, "No IRQ specified\n");
529
530 /* If we either don't have an interrupt for pen down events or
531 * failed to acquire it then we need to poll.
532 */
533 if (wm->pen_irq == 0)
534 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
535 wm->ts_reader_interval);
536
537 return 0;
538 }
539
540 /**
541 * wm97xx_ts_input_close - Close the touch screen input device.
542 * @idev: Input device to be closed.
543 *
544 * Called by the input sub system to close a wm97xx touchscreen
545 * device. Kills the touchscreen thread and stops the touch
546 * digitiser.
547 */
548
549 static void wm97xx_ts_input_close(struct input_dev *idev)
550 {
551 struct wm97xx *wm = input_get_drvdata(idev);
552 u16 reg;
553
554 if (wm->pen_irq) {
555 /* Return the interrupt to GPIO usage (disabling it) */
556 if (wm->id != WM9705_ID2) {
557 BUG_ON(!wm->mach_ops->irq_gpio);
558 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
559 wm97xx_reg_write(wm, AC97_MISC_AFE,
560 reg | wm->mach_ops->irq_gpio);
561 }
562
563 free_irq(wm->pen_irq, wm);
564 }
565
566 wm->pen_is_down = 0;
567
568 /* Balance out interrupt disables/enables */
569 if (cancel_work_sync(&wm->pen_event_work))
570 wm->mach_ops->irq_enable(wm, 1);
571
572 /* ts_reader rearms itself so we need to explicitly stop it
573 * before we destroy the workqueue.
574 */
575 cancel_delayed_work_sync(&wm->ts_reader);
576
577 destroy_workqueue(wm->ts_workq);
578
579 /* stop digitiser */
580 wm->codec->dig_enable(wm, 0);
581 if (wm->mach_ops && wm->mach_ops->acc_enabled)
582 wm->codec->acc_enable(wm, 0);
583 }
584
585 static int wm97xx_register_touch(struct wm97xx *wm)
586 {
587 struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev);
588 int ret;
589
590 wm->input_dev = devm_input_allocate_device(wm->dev);
591 if (wm->input_dev == NULL)
592 return -ENOMEM;
593
594 /* set up touch configuration */
595 wm->input_dev->name = "wm97xx touchscreen";
596 wm->input_dev->phys = "wm97xx";
597 wm->input_dev->open = wm97xx_ts_input_open;
598 wm->input_dev->close = wm97xx_ts_input_close;
599
600 __set_bit(EV_ABS, wm->input_dev->evbit);
601 __set_bit(EV_KEY, wm->input_dev->evbit);
602 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
603
604 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
605 abs_x[2], 0);
606 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
607 abs_y[2], 0);
608 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
609 abs_p[2], 0);
610
611 input_set_drvdata(wm->input_dev, wm);
612 wm->input_dev->dev.parent = wm->dev;
613
614 ret = input_register_device(wm->input_dev);
615 if (ret)
616 return ret;
617
618 /*
619 * register our extended touch device (for machine specific
620 * extensions)
621 */
622 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
623 if (!wm->touch_dev) {
624 ret = -ENOMEM;
625 goto touch_err;
626 }
627 platform_set_drvdata(wm->touch_dev, wm);
628 wm->touch_dev->dev.parent = wm->dev;
629 wm->touch_dev->dev.platform_data = pdata;
630 ret = platform_device_add(wm->touch_dev);
631 if (ret < 0)
632 goto touch_reg_err;
633
634 return 0;
635 touch_reg_err:
636 platform_device_put(wm->touch_dev);
637 touch_err:
638 input_unregister_device(wm->input_dev);
639 wm->input_dev = NULL;
640
641 return ret;
642 }
643
644 static void wm97xx_unregister_touch(struct wm97xx *wm)
645 {
646 platform_device_unregister(wm->touch_dev);
647 input_unregister_device(wm->input_dev);
648 wm->input_dev = NULL;
649 }
650
651 static int _wm97xx_probe(struct wm97xx *wm)
652 {
653 int id = 0;
654
655 mutex_init(&wm->codec_mutex);
656 dev_set_drvdata(wm->dev, wm);
657
658 /* check that we have a supported codec */
659 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
660 if (id != WM97XX_ID1) {
661 dev_err(wm->dev,
662 "Device with vendor %04x is not a wm97xx\n", id);
663 return -ENODEV;
664 }
665
666 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
667
668 wm->variant = WM97xx_GENERIC;
669
670 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
671
672 switch (wm->id & 0xff) {
673 #ifdef CONFIG_TOUCHSCREEN_WM9705
674 case 0x05:
675 wm->codec = &wm9705_codec;
676 break;
677 #endif
678 #ifdef CONFIG_TOUCHSCREEN_WM9712
679 case 0x12:
680 wm->codec = &wm9712_codec;
681 break;
682 #endif
683 #ifdef CONFIG_TOUCHSCREEN_WM9713
684 case 0x13:
685 wm->codec = &wm9713_codec;
686 break;
687 #endif
688 default:
689 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
690 wm->id & 0xff);
691 return -ENODEV;
692 }
693
694 /* set up physical characteristics */
695 wm->codec->phy_init(wm);
696
697 /* load gpio cache */
698 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
699 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
700 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
701 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
702 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
703 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
704
705 return wm97xx_register_touch(wm);
706 }
707
708 static void wm97xx_remove_battery(struct wm97xx *wm)
709 {
710 platform_device_unregister(wm->battery_dev);
711 }
712
713 static int wm97xx_add_battery(struct wm97xx *wm,
714 struct wm97xx_batt_pdata *pdata)
715 {
716 int ret;
717
718 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
719 if (!wm->battery_dev)
720 return -ENOMEM;
721
722 platform_set_drvdata(wm->battery_dev, wm);
723 wm->battery_dev->dev.parent = wm->dev;
724 wm->battery_dev->dev.platform_data = pdata;
725 ret = platform_device_add(wm->battery_dev);
726 if (ret)
727 platform_device_put(wm->battery_dev);
728
729 return ret;
730 }
731
732 static int wm97xx_probe(struct device *dev)
733 {
734 struct wm97xx *wm;
735 int ret;
736 struct wm97xx_pdata *pdata = dev_get_platdata(dev);
737
738 wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL);
739 if (!wm)
740 return -ENOMEM;
741
742 wm->dev = dev;
743 wm->ac97 = to_ac97_t(dev);
744
745 ret = _wm97xx_probe(wm);
746 if (ret)
747 return ret;
748
749 ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL);
750 if (ret < 0)
751 goto batt_err;
752
753 return ret;
754
755 batt_err:
756 wm97xx_unregister_touch(wm);
757 return ret;
758 }
759
760 static int wm97xx_remove(struct device *dev)
761 {
762 struct wm97xx *wm = dev_get_drvdata(dev);
763
764 wm97xx_remove_battery(wm);
765 wm97xx_unregister_touch(wm);
766
767 return 0;
768 }
769
770 static int wm97xx_mfd_probe(struct platform_device *pdev)
771 {
772 struct wm97xx *wm;
773 struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev);
774 int ret;
775
776 wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL);
777 if (!wm)
778 return -ENOMEM;
779
780 wm->dev = &pdev->dev;
781 wm->ac97 = mfd_pdata->ac97;
782
783 ret = _wm97xx_probe(wm);
784 if (ret)
785 return ret;
786
787 ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata);
788 if (ret < 0)
789 goto batt_err;
790
791 return ret;
792
793 batt_err:
794 wm97xx_unregister_touch(wm);
795 return ret;
796 }
797
798 static int wm97xx_mfd_remove(struct platform_device *pdev)
799 {
800 return wm97xx_remove(&pdev->dev);
801 }
802
803 static int __maybe_unused wm97xx_suspend(struct device *dev)
804 {
805 struct wm97xx *wm = dev_get_drvdata(dev);
806 u16 reg;
807 int suspend_mode;
808
809 if (device_may_wakeup(&wm->input_dev->dev))
810 suspend_mode = wm->suspend_mode;
811 else
812 suspend_mode = 0;
813
814 if (wm->input_dev->users)
815 cancel_delayed_work_sync(&wm->ts_reader);
816
817 /* Power down the digitiser (bypassing the cache for resume) */
818 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
819 reg &= ~WM97XX_PRP_DET_DIG;
820 if (wm->input_dev->users)
821 reg |= suspend_mode;
822 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
823
824 /* WM9713 has an additional power bit - turn it off if there
825 * are no users or if suspend mode is zero. */
826 if (wm->id == WM9713_ID2 &&
827 (!wm->input_dev->users || !suspend_mode)) {
828 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
829 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
830 }
831
832 return 0;
833 }
834
835 static int __maybe_unused wm97xx_resume(struct device *dev)
836 {
837 struct wm97xx *wm = dev_get_drvdata(dev);
838
839 /* restore digitiser and gpios */
840 if (wm->id == WM9713_ID2) {
841 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
842 wm97xx_reg_write(wm, 0x5a, wm->misc);
843 if (wm->input_dev->users) {
844 u16 reg;
845 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
846 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
847 }
848 }
849
850 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
851 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
852
853 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
854 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
855 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
856 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
857 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
858 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
859
860 if (wm->input_dev->users && !wm->pen_irq) {
861 wm->ts_reader_interval = wm->ts_reader_min_interval;
862 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
863 wm->ts_reader_interval);
864 }
865
866 return 0;
867 }
868
869 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
870
871 /*
872 * Machine specific operations
873 */
874 int wm97xx_register_mach_ops(struct wm97xx *wm,
875 struct wm97xx_mach_ops *mach_ops)
876 {
877 mutex_lock(&wm->codec_mutex);
878 if (wm->mach_ops) {
879 mutex_unlock(&wm->codec_mutex);
880 return -EINVAL;
881 }
882 wm->mach_ops = mach_ops;
883 mutex_unlock(&wm->codec_mutex);
884
885 return 0;
886 }
887 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
888
889 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
890 {
891 mutex_lock(&wm->codec_mutex);
892 wm->mach_ops = NULL;
893 mutex_unlock(&wm->codec_mutex);
894 }
895 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
896
897 static struct device_driver wm97xx_driver = {
898 .name = "wm97xx-ts",
899 #ifdef CONFIG_AC97_BUS
900 .bus = &ac97_bus_type,
901 #endif
902 .owner = THIS_MODULE,
903 .probe = wm97xx_probe,
904 .remove = wm97xx_remove,
905 .pm = &wm97xx_pm_ops,
906 };
907
908 static struct platform_driver wm97xx_mfd_driver = {
909 .driver = {
910 .name = "wm97xx-ts",
911 .pm = &wm97xx_pm_ops,
912 },
913 .probe = wm97xx_mfd_probe,
914 .remove = wm97xx_mfd_remove,
915 };
916
917 static int __init wm97xx_init(void)
918 {
919 int ret;
920
921 ret = platform_driver_register(&wm97xx_mfd_driver);
922 if (ret)
923 return ret;
924
925 if (IS_BUILTIN(CONFIG_AC97_BUS))
926 ret = driver_register(&wm97xx_driver);
927 return ret;
928 }
929
930 static void __exit wm97xx_exit(void)
931 {
932 if (IS_BUILTIN(CONFIG_AC97_BUS))
933 driver_unregister(&wm97xx_driver);
934 platform_driver_unregister(&wm97xx_mfd_driver);
935 }
936
937 module_init(wm97xx_init);
938 module_exit(wm97xx_exit);
939
940 /* Module information */
941 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
942 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
943 MODULE_LICENSE("GPL");
Linux with added FPC-III support