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
69 static int abs_x[3] = {150, 4000, 5};
70 module_param_array(abs_x, int, NULL, 0);
71 MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz");
72
73 static int abs_y[3] = {200, 4000, 40};
74 module_param_array(abs_y, int, NULL, 0);
75 MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz");
76
77 static int abs_p[3] = {0, 150, 4};
78 module_param_array(abs_p, int, NULL, 0);
79 MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz");
80
81 /*
82 * wm97xx IO access, all IO locking done by AC97 layer
83 */
wm97xx_reg_read(struct wm97xx * wm,u16 reg)84 int 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 }
91 EXPORT_SYMBOL_GPL(wm97xx_reg_read);
92
wm97xx_reg_write(struct wm97xx * wm,u16 reg,u16 val)93 void 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 }
110 EXPORT_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
wm97xx_read_aux_adc(struct wm97xx * wm,u16 adcsel)120 int 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 }
165 EXPORT_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
wm97xx_get_gpio(struct wm97xx * wm,u32 gpio)175 enum 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 }
191 EXPORT_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 *
198 *
199 * Set the status of a codec GPIO pin
200 */
201
wm97xx_set_gpio(struct wm97xx * wm,u32 gpio,enum wm97xx_gpio_status status)202 void 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 }
221 EXPORT_SYMBOL_GPL(wm97xx_set_gpio);
222
223 /*
224 * Codec GPIO pin configuration, this sets pin direction, polarity,
225 * stickyness and wake up.
226 */
wm97xx_config_gpio(struct wm97xx * wm,u32 gpio,enum wm97xx_gpio_dir dir,enum wm97xx_gpio_pol pol,enum wm97xx_gpio_sticky sticky,enum wm97xx_gpio_wake wake)227 void 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 }
268 EXPORT_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 */
wm97xx_set_suspend_mode(struct wm97xx * wm,u16 mode)280 void 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 }
285 EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
286
287 /*
288 * Handle a pen down interrupt.
289 */
wm97xx_pen_irq_worker(struct work_struct * work)290 static 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 */
wm97xx_pen_interrupt(int irq,void * dev_id)358 static 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 */
wm97xx_init_pen_irq(struct wm97xx * wm)373 static 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
wm97xx_read_samples(struct wm97xx * wm)402 static 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
464 out:
465 mutex_unlock(&wm->codec_mutex);
466 return rc;
467 }
468
469 /*
470 * The touchscreen sample reader.
471 */
wm97xx_ts_reader(struct work_struct * work)472 static 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 */
wm97xx_ts_input_open(struct input_dev * idev)495 static 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
wm97xx_ts_input_close(struct input_dev * idev)544 static 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
wm97xx_register_touch(struct wm97xx * wm)580 static 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;
630 touch_reg_err:
631 platform_device_put(wm->touch_dev);
632 touch_err:
633 input_unregister_device(wm->input_dev);
634 wm->input_dev = NULL;
635
636 return ret;
637 }
638
wm97xx_unregister_touch(struct wm97xx * wm)639 static 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
_wm97xx_probe(struct wm97xx * wm)646 static 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
wm97xx_remove_battery(struct wm97xx * wm)703 static void wm97xx_remove_battery(struct wm97xx *wm)
704 {
705 platform_device_unregister(wm->battery_dev);
706 }
707
wm97xx_add_battery(struct wm97xx * wm,struct wm97xx_batt_pdata * pdata)708 static 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
wm97xx_probe(struct device * dev)727 static 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
750 batt_err:
751 wm97xx_unregister_touch(wm);
752 return ret;
753 }
754
wm97xx_remove(struct device * dev)755 static 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
wm97xx_mfd_probe(struct platform_device * pdev)765 static 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
788 batt_err:
789 wm97xx_unregister_touch(wm);
790 return ret;
791 }
792
wm97xx_mfd_remove(struct platform_device * pdev)793 static int wm97xx_mfd_remove(struct platform_device *pdev)
794 {
795 return wm97xx_remove(&pdev->dev);
796 }
797
wm97xx_suspend(struct device * dev)798 static 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 if (wm->input_dev->users)
810 cancel_delayed_work_sync(&wm->ts_reader);
811
812 /* Power down the digitiser (bypassing the cache for resume) */
813 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
814 reg &= ~WM97XX_PRP_DET_DIG;
815 if (wm->input_dev->users)
816 reg |= suspend_mode;
817 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
818
819 /* WM9713 has an additional power bit - turn it off if there
820 * are no users or if suspend mode is zero. */
821 if (wm->id == WM9713_ID2 &&
822 (!wm->input_dev->users || !suspend_mode)) {
823 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
824 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
825 }
826
827 return 0;
828 }
829
wm97xx_resume(struct device * dev)830 static int __maybe_unused wm97xx_resume(struct device *dev)
831 {
832 struct wm97xx *wm = dev_get_drvdata(dev);
833
834 /* restore digitiser and gpios */
835 if (wm->id == WM9713_ID2) {
836 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
837 wm97xx_reg_write(wm, 0x5a, wm->misc);
838 if (wm->input_dev->users) {
839 u16 reg;
840 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
841 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
842 }
843 }
844
845 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
846 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
847
848 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
849 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
850 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
851 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
852 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
853 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
854
855 if (wm->input_dev->users && !wm->pen_irq) {
856 wm->ts_reader_interval = wm->ts_reader_min_interval;
857 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
858 wm->ts_reader_interval);
859 }
860
861 return 0;
862 }
863
864 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
865
866 /*
867 * Machine specific operations
868 */
wm97xx_register_mach_ops(struct wm97xx * wm,struct wm97xx_mach_ops * mach_ops)869 int wm97xx_register_mach_ops(struct wm97xx *wm,
870 struct wm97xx_mach_ops *mach_ops)
871 {
872 mutex_lock(&wm->codec_mutex);
873 if (wm->mach_ops) {
874 mutex_unlock(&wm->codec_mutex);
875 return -EINVAL;
876 }
877 wm->mach_ops = mach_ops;
878 mutex_unlock(&wm->codec_mutex);
879
880 return 0;
881 }
882 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
883
wm97xx_unregister_mach_ops(struct wm97xx * wm)884 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
885 {
886 mutex_lock(&wm->codec_mutex);
887 wm->mach_ops = NULL;
888 mutex_unlock(&wm->codec_mutex);
889 }
890 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
891
892 static struct device_driver wm97xx_driver = {
893 .name = "wm97xx-ts",
894 #ifdef CONFIG_AC97_BUS
895 .bus = &ac97_bus_type,
896 #endif
897 .owner = THIS_MODULE,
898 .probe = wm97xx_probe,
899 .remove = wm97xx_remove,
900 .pm = &wm97xx_pm_ops,
901 };
902
903 static struct platform_driver wm97xx_mfd_driver = {
904 .driver = {
905 .name = "wm97xx-ts",
906 .pm = &wm97xx_pm_ops,
907 },
908 .probe = wm97xx_mfd_probe,
909 .remove = wm97xx_mfd_remove,
910 };
911
wm97xx_init(void)912 static int __init wm97xx_init(void)
913 {
914 int ret;
915
916 ret = platform_driver_register(&wm97xx_mfd_driver);
917 if (ret)
918 return ret;
919
920 if (IS_BUILTIN(CONFIG_AC97_BUS))
921 ret = driver_register(&wm97xx_driver);
922 return ret;
923 }
924
wm97xx_exit(void)925 static void __exit wm97xx_exit(void)
926 {
927 if (IS_BUILTIN(CONFIG_AC97_BUS))
928 driver_unregister(&wm97xx_driver);
929 platform_driver_unregister(&wm97xx_mfd_driver);
930 }
931
932 module_init(wm97xx_init);
933 module_exit(wm97xx_exit);
934
935 /* Module information */
936 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
937 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
938 MODULE_LICENSE("GPL");
939