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 * @status: status
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 * Codec PENDOWN irq handler
289 *
290 */
wm97xx_pen_interrupt(int irq,void * dev_id)291 static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
292 {
293 struct wm97xx *wm = dev_id;
294 int pen_was_down = wm->pen_is_down;
295
296 /* do we need to enable the touch panel reader */
297 if (wm->id == WM9705_ID2) {
298 if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) &
299 WM97XX_PEN_DOWN)
300 wm->pen_is_down = 1;
301 else
302 wm->pen_is_down = 0;
303 } else {
304 u16 status, pol;
305 mutex_lock(&wm->codec_mutex);
306 status = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
307 pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
308
309 if (WM97XX_GPIO_13 & pol & status) {
310 wm->pen_is_down = 1;
311 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol &
312 ~WM97XX_GPIO_13);
313 } else {
314 wm->pen_is_down = 0;
315 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol |
316 WM97XX_GPIO_13);
317 }
318
319 if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613)
320 wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status &
321 ~WM97XX_GPIO_13) << 1);
322 else
323 wm97xx_reg_write(wm, AC97_GPIO_STATUS, status &
324 ~WM97XX_GPIO_13);
325 mutex_unlock(&wm->codec_mutex);
326 }
327
328 /* If the system is not using continuous mode or it provides a
329 * pen down operation then we need to schedule polls while the
330 * pen is down. Otherwise the machine driver is responsible
331 * for scheduling reads.
332 */
333 if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) {
334 if (wm->pen_is_down && !pen_was_down) {
335 /* Data is not available immediately on pen down */
336 queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1);
337 }
338
339 /* Let ts_reader report the pen up for debounce. */
340 if (!wm->pen_is_down && pen_was_down)
341 wm->pen_is_down = 1;
342 }
343
344 if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
345 wm->mach_ops->acc_pen_up(wm);
346
347 return IRQ_HANDLED;
348 }
349
350 /*
351 * initialise pen IRQ handler and workqueue
352 */
wm97xx_init_pen_irq(struct wm97xx * wm)353 static int wm97xx_init_pen_irq(struct wm97xx *wm)
354 {
355 u16 reg;
356
357 if (request_threaded_irq(wm->pen_irq, NULL, wm97xx_pen_interrupt,
358 IRQF_SHARED | IRQF_ONESHOT,
359 "wm97xx-pen", wm)) {
360 dev_err(wm->dev,
361 "Failed to register pen down interrupt, polling");
362 wm->pen_irq = 0;
363 return -EINVAL;
364 }
365
366 /* Configure GPIO as interrupt source on WM971x */
367 if (wm->id != WM9705_ID2) {
368 BUG_ON(!wm->mach_ops->irq_gpio);
369 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
370 wm97xx_reg_write(wm, AC97_MISC_AFE,
371 reg & ~(wm->mach_ops->irq_gpio));
372 reg = wm97xx_reg_read(wm, 0x5a);
373 wm97xx_reg_write(wm, 0x5a, reg & ~0x0001);
374 }
375
376 return 0;
377 }
378
wm97xx_read_samples(struct wm97xx * wm)379 static int wm97xx_read_samples(struct wm97xx *wm)
380 {
381 struct wm97xx_data data;
382 int rc;
383
384 mutex_lock(&wm->codec_mutex);
385
386 if (wm->mach_ops && wm->mach_ops->acc_enabled)
387 rc = wm->mach_ops->acc_pen_down(wm);
388 else
389 rc = wm->codec->poll_touch(wm, &data);
390
391 if (rc & RC_PENUP) {
392 if (wm->pen_is_down) {
393 wm->pen_is_down = 0;
394 dev_dbg(wm->dev, "pen up\n");
395 input_report_abs(wm->input_dev, ABS_PRESSURE, 0);
396 input_report_key(wm->input_dev, BTN_TOUCH, 0);
397 input_sync(wm->input_dev);
398 } else if (!(rc & RC_AGAIN)) {
399 /* We need high frequency updates only while
400 * pen is down, the user never will be able to
401 * touch screen faster than a few times per
402 * second... On the other hand, when the user
403 * is actively working with the touchscreen we
404 * don't want to lose the quick response. So we
405 * will slowly increase sleep time after the
406 * pen is up and quicky restore it to ~one task
407 * switch when pen is down again.
408 */
409 if (wm->ts_reader_interval < HZ / 10)
410 wm->ts_reader_interval++;
411 }
412
413 } else if (rc & RC_VALID) {
414 dev_dbg(wm->dev,
415 "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",
416 data.x >> 12, data.x & 0xfff, data.y >> 12,
417 data.y & 0xfff, data.p >> 12, data.p & 0xfff);
418
419 if (abs_x[0] > (data.x & 0xfff) ||
420 abs_x[1] < (data.x & 0xfff) ||
421 abs_y[0] > (data.y & 0xfff) ||
422 abs_y[1] < (data.y & 0xfff)) {
423 dev_dbg(wm->dev, "Measurement out of range, dropping it\n");
424 rc = RC_AGAIN;
425 goto out;
426 }
427
428 input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff);
429 input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff);
430 input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff);
431 input_report_key(wm->input_dev, BTN_TOUCH, 1);
432 input_sync(wm->input_dev);
433 wm->pen_is_down = 1;
434 wm->ts_reader_interval = wm->ts_reader_min_interval;
435 } else if (rc & RC_PENDOWN) {
436 dev_dbg(wm->dev, "pen down\n");
437 wm->pen_is_down = 1;
438 wm->ts_reader_interval = wm->ts_reader_min_interval;
439 }
440
441 out:
442 mutex_unlock(&wm->codec_mutex);
443 return rc;
444 }
445
446 /*
447 * The touchscreen sample reader.
448 */
wm97xx_ts_reader(struct work_struct * work)449 static void wm97xx_ts_reader(struct work_struct *work)
450 {
451 int rc;
452 struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work);
453
454 BUG_ON(!wm->codec);
455
456 do {
457 rc = wm97xx_read_samples(wm);
458 } while (rc & RC_AGAIN);
459
460 if (wm->pen_is_down || !wm->pen_irq)
461 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
462 wm->ts_reader_interval);
463 }
464
465 /**
466 * wm97xx_ts_input_open - Open the touch screen input device.
467 * @idev: Input device to be opened.
468 *
469 * Called by the input sub system to open a wm97xx touchscreen device.
470 * Starts the touchscreen thread and touch digitiser.
471 */
wm97xx_ts_input_open(struct input_dev * idev)472 static int wm97xx_ts_input_open(struct input_dev *idev)
473 {
474 struct wm97xx *wm = input_get_drvdata(idev);
475
476 wm->ts_workq = alloc_ordered_workqueue("kwm97xx", 0);
477 if (wm->ts_workq == NULL) {
478 dev_err(wm->dev,
479 "Failed to create workqueue\n");
480 return -EINVAL;
481 }
482
483 /* start digitiser */
484 if (wm->mach_ops && wm->mach_ops->acc_enabled)
485 wm->codec->acc_enable(wm, 1);
486 wm->codec->dig_enable(wm, 1);
487
488 INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
489
490 wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
491 if (wm->ts_reader_min_interval < 1)
492 wm->ts_reader_min_interval = 1;
493 wm->ts_reader_interval = wm->ts_reader_min_interval;
494
495 wm->pen_is_down = 0;
496 if (wm->pen_irq)
497 wm97xx_init_pen_irq(wm);
498 else
499 dev_err(wm->dev, "No IRQ specified\n");
500
501 /* If we either don't have an interrupt for pen down events or
502 * failed to acquire it then we need to poll.
503 */
504 if (wm->pen_irq == 0)
505 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
506 wm->ts_reader_interval);
507
508 return 0;
509 }
510
511 /**
512 * wm97xx_ts_input_close - Close the touch screen input device.
513 * @idev: Input device to be closed.
514 *
515 * Called by the input sub system to close a wm97xx touchscreen
516 * device. Kills the touchscreen thread and stops the touch
517 * digitiser.
518 */
519
wm97xx_ts_input_close(struct input_dev * idev)520 static void wm97xx_ts_input_close(struct input_dev *idev)
521 {
522 struct wm97xx *wm = input_get_drvdata(idev);
523 u16 reg;
524
525 if (wm->pen_irq) {
526 /* Return the interrupt to GPIO usage (disabling it) */
527 if (wm->id != WM9705_ID2) {
528 BUG_ON(!wm->mach_ops->irq_gpio);
529 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
530 wm97xx_reg_write(wm, AC97_MISC_AFE,
531 reg | wm->mach_ops->irq_gpio);
532 }
533
534 free_irq(wm->pen_irq, wm);
535 }
536
537 wm->pen_is_down = 0;
538
539 /* ts_reader rearms itself so we need to explicitly stop it
540 * before we destroy the workqueue.
541 */
542 cancel_delayed_work_sync(&wm->ts_reader);
543
544 destroy_workqueue(wm->ts_workq);
545
546 /* stop digitiser */
547 wm->codec->dig_enable(wm, 0);
548 if (wm->mach_ops && wm->mach_ops->acc_enabled)
549 wm->codec->acc_enable(wm, 0);
550 }
551
wm97xx_register_touch(struct wm97xx * wm)552 static int wm97xx_register_touch(struct wm97xx *wm)
553 {
554 struct wm97xx_pdata *pdata = dev_get_platdata(wm->dev);
555 int ret;
556
557 wm->input_dev = devm_input_allocate_device(wm->dev);
558 if (wm->input_dev == NULL)
559 return -ENOMEM;
560
561 /* set up touch configuration */
562 wm->input_dev->name = "wm97xx touchscreen";
563 wm->input_dev->phys = "wm97xx";
564 wm->input_dev->open = wm97xx_ts_input_open;
565 wm->input_dev->close = wm97xx_ts_input_close;
566
567 __set_bit(EV_ABS, wm->input_dev->evbit);
568 __set_bit(EV_KEY, wm->input_dev->evbit);
569 __set_bit(BTN_TOUCH, wm->input_dev->keybit);
570
571 input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1],
572 abs_x[2], 0);
573 input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1],
574 abs_y[2], 0);
575 input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1],
576 abs_p[2], 0);
577
578 input_set_drvdata(wm->input_dev, wm);
579 wm->input_dev->dev.parent = wm->dev;
580
581 ret = input_register_device(wm->input_dev);
582 if (ret)
583 return ret;
584
585 /*
586 * register our extended touch device (for machine specific
587 * extensions)
588 */
589 wm->touch_dev = platform_device_alloc("wm97xx-touch", -1);
590 if (!wm->touch_dev)
591 return -ENOMEM;
592
593 platform_set_drvdata(wm->touch_dev, wm);
594 wm->touch_dev->dev.parent = wm->dev;
595 wm->touch_dev->dev.platform_data = pdata;
596 ret = platform_device_add(wm->touch_dev);
597 if (ret < 0)
598 goto touch_reg_err;
599
600 return 0;
601 touch_reg_err:
602 platform_device_put(wm->touch_dev);
603
604 return ret;
605 }
606
wm97xx_unregister_touch(struct wm97xx * wm)607 static void wm97xx_unregister_touch(struct wm97xx *wm)
608 {
609 platform_device_unregister(wm->touch_dev);
610 }
611
_wm97xx_probe(struct wm97xx * wm)612 static int _wm97xx_probe(struct wm97xx *wm)
613 {
614 int id = 0;
615
616 mutex_init(&wm->codec_mutex);
617 dev_set_drvdata(wm->dev, wm);
618
619 /* check that we have a supported codec */
620 id = wm97xx_reg_read(wm, AC97_VENDOR_ID1);
621 if (id != WM97XX_ID1) {
622 dev_err(wm->dev,
623 "Device with vendor %04x is not a wm97xx\n", id);
624 return -ENODEV;
625 }
626
627 wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2);
628
629 wm->variant = WM97xx_GENERIC;
630
631 dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff);
632
633 switch (wm->id & 0xff) {
634 #ifdef CONFIG_TOUCHSCREEN_WM9705
635 case 0x05:
636 wm->codec = &wm9705_codec;
637 break;
638 #endif
639 #ifdef CONFIG_TOUCHSCREEN_WM9712
640 case 0x12:
641 wm->codec = &wm9712_codec;
642 break;
643 #endif
644 #ifdef CONFIG_TOUCHSCREEN_WM9713
645 case 0x13:
646 wm->codec = &wm9713_codec;
647 break;
648 #endif
649 default:
650 dev_err(wm->dev, "Support for wm97%02x not compiled in.\n",
651 wm->id & 0xff);
652 return -ENODEV;
653 }
654
655 /* set up physical characteristics */
656 wm->codec->phy_init(wm);
657
658 /* load gpio cache */
659 wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG);
660 wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY);
661 wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY);
662 wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP);
663 wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS);
664 wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE);
665
666 return wm97xx_register_touch(wm);
667 }
668
wm97xx_remove_battery(struct wm97xx * wm)669 static void wm97xx_remove_battery(struct wm97xx *wm)
670 {
671 platform_device_unregister(wm->battery_dev);
672 }
673
wm97xx_add_battery(struct wm97xx * wm,struct wm97xx_batt_pdata * pdata)674 static int wm97xx_add_battery(struct wm97xx *wm,
675 struct wm97xx_batt_pdata *pdata)
676 {
677 int ret;
678
679 wm->battery_dev = platform_device_alloc("wm97xx-battery", -1);
680 if (!wm->battery_dev)
681 return -ENOMEM;
682
683 platform_set_drvdata(wm->battery_dev, wm);
684 wm->battery_dev->dev.parent = wm->dev;
685 wm->battery_dev->dev.platform_data = pdata;
686 ret = platform_device_add(wm->battery_dev);
687 if (ret)
688 platform_device_put(wm->battery_dev);
689
690 return ret;
691 }
692
wm97xx_probe(struct device * dev)693 static int wm97xx_probe(struct device *dev)
694 {
695 struct wm97xx *wm;
696 int ret;
697 struct wm97xx_pdata *pdata = dev_get_platdata(dev);
698
699 wm = devm_kzalloc(dev, sizeof(struct wm97xx), GFP_KERNEL);
700 if (!wm)
701 return -ENOMEM;
702
703 wm->dev = dev;
704 wm->ac97 = to_ac97_t(dev);
705
706 ret = _wm97xx_probe(wm);
707 if (ret)
708 return ret;
709
710 ret = wm97xx_add_battery(wm, pdata ? pdata->batt_pdata : NULL);
711 if (ret < 0)
712 goto batt_err;
713
714 return ret;
715
716 batt_err:
717 wm97xx_unregister_touch(wm);
718 return ret;
719 }
720
wm97xx_remove(struct device * dev)721 static int wm97xx_remove(struct device *dev)
722 {
723 struct wm97xx *wm = dev_get_drvdata(dev);
724
725 wm97xx_remove_battery(wm);
726 wm97xx_unregister_touch(wm);
727
728 return 0;
729 }
730
wm97xx_mfd_probe(struct platform_device * pdev)731 static int wm97xx_mfd_probe(struct platform_device *pdev)
732 {
733 struct wm97xx *wm;
734 struct wm97xx_platform_data *mfd_pdata = dev_get_platdata(&pdev->dev);
735 int ret;
736
737 wm = devm_kzalloc(&pdev->dev, sizeof(struct wm97xx), GFP_KERNEL);
738 if (!wm)
739 return -ENOMEM;
740
741 wm->dev = &pdev->dev;
742 wm->ac97 = mfd_pdata->ac97;
743
744 ret = _wm97xx_probe(wm);
745 if (ret)
746 return ret;
747
748 ret = wm97xx_add_battery(wm, mfd_pdata->batt_pdata);
749 if (ret < 0)
750 goto batt_err;
751
752 return ret;
753
754 batt_err:
755 wm97xx_unregister_touch(wm);
756 return ret;
757 }
758
wm97xx_mfd_remove(struct platform_device * pdev)759 static int wm97xx_mfd_remove(struct platform_device *pdev)
760 {
761 wm97xx_remove(&pdev->dev);
762
763 return 0;
764 }
765
wm97xx_suspend(struct device * dev)766 static int __maybe_unused wm97xx_suspend(struct device *dev)
767 {
768 struct wm97xx *wm = dev_get_drvdata(dev);
769 u16 reg;
770 int suspend_mode;
771
772 if (device_may_wakeup(&wm->input_dev->dev))
773 suspend_mode = wm->suspend_mode;
774 else
775 suspend_mode = 0;
776
777 mutex_lock(&wm->input_dev->mutex);
778 if (input_device_enabled(wm->input_dev))
779 cancel_delayed_work_sync(&wm->ts_reader);
780
781 /* Power down the digitiser (bypassing the cache for resume) */
782 reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2);
783 reg &= ~WM97XX_PRP_DET_DIG;
784 if (input_device_enabled(wm->input_dev))
785 reg |= suspend_mode;
786 wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg);
787
788 /* WM9713 has an additional power bit - turn it off if there
789 * are no users or if suspend mode is zero. */
790 if (wm->id == WM9713_ID2 &&
791 (!input_device_enabled(wm->input_dev) || !suspend_mode)) {
792 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000;
793 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
794 }
795 mutex_unlock(&wm->input_dev->mutex);
796
797 return 0;
798 }
799
wm97xx_resume(struct device * dev)800 static int __maybe_unused wm97xx_resume(struct device *dev)
801 {
802 struct wm97xx *wm = dev_get_drvdata(dev);
803
804 mutex_lock(&wm->input_dev->mutex);
805 /* restore digitiser and gpios */
806 if (wm->id == WM9713_ID2) {
807 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]);
808 wm97xx_reg_write(wm, 0x5a, wm->misc);
809 if (input_device_enabled(wm->input_dev)) {
810 u16 reg;
811 reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff;
812 wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg);
813 }
814 }
815
816 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]);
817 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]);
818
819 wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]);
820 wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]);
821 wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]);
822 wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]);
823 wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]);
824 wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]);
825
826 if (input_device_enabled(wm->input_dev) && !wm->pen_irq) {
827 wm->ts_reader_interval = wm->ts_reader_min_interval;
828 queue_delayed_work(wm->ts_workq, &wm->ts_reader,
829 wm->ts_reader_interval);
830 }
831 mutex_unlock(&wm->input_dev->mutex);
832
833 return 0;
834 }
835
836 static SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume);
837
838 /*
839 * Machine specific operations
840 */
wm97xx_register_mach_ops(struct wm97xx * wm,struct wm97xx_mach_ops * mach_ops)841 int wm97xx_register_mach_ops(struct wm97xx *wm,
842 struct wm97xx_mach_ops *mach_ops)
843 {
844 mutex_lock(&wm->codec_mutex);
845 if (wm->mach_ops) {
846 mutex_unlock(&wm->codec_mutex);
847 return -EINVAL;
848 }
849 wm->mach_ops = mach_ops;
850 mutex_unlock(&wm->codec_mutex);
851
852 return 0;
853 }
854 EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops);
855
wm97xx_unregister_mach_ops(struct wm97xx * wm)856 void wm97xx_unregister_mach_ops(struct wm97xx *wm)
857 {
858 mutex_lock(&wm->codec_mutex);
859 wm->mach_ops = NULL;
860 mutex_unlock(&wm->codec_mutex);
861 }
862 EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops);
863
864 static struct device_driver wm97xx_driver = {
865 .name = "wm97xx-ts",
866 #ifdef CONFIG_AC97_BUS
867 .bus = &ac97_bus_type,
868 #endif
869 .owner = THIS_MODULE,
870 .probe = wm97xx_probe,
871 .remove = wm97xx_remove,
872 .pm = &wm97xx_pm_ops,
873 };
874
875 static struct platform_driver wm97xx_mfd_driver = {
876 .driver = {
877 .name = "wm97xx-ts",
878 .pm = &wm97xx_pm_ops,
879 },
880 .probe = wm97xx_mfd_probe,
881 .remove = wm97xx_mfd_remove,
882 };
883
wm97xx_init(void)884 static int __init wm97xx_init(void)
885 {
886 int ret;
887
888 ret = platform_driver_register(&wm97xx_mfd_driver);
889 if (ret)
890 return ret;
891
892 if (IS_BUILTIN(CONFIG_AC97_BUS))
893 ret = driver_register(&wm97xx_driver);
894 return ret;
895 }
896
wm97xx_exit(void)897 static void __exit wm97xx_exit(void)
898 {
899 if (IS_BUILTIN(CONFIG_AC97_BUS))
900 driver_unregister(&wm97xx_driver);
901 platform_driver_unregister(&wm97xx_mfd_driver);
902 }
903
904 module_init(wm97xx_init);
905 module_exit(wm97xx_exit);
906
907 /* Module information */
908 MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
909 MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver");
910 MODULE_LICENSE("GPL");
911