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 | */ |
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 | |
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 | |
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(lock: &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 | |
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(lock: &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 | |
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(lock: &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 | */ |
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(lock: &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 | */ |
280 | void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) |
281 | { |
282 | wm->suspend_mode = mode; |
283 | device_init_wakeup(dev: &wm->input_dev->dev, enable: mode != 0); |
284 | } |
285 | EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); |
286 | |
287 | /* |
288 | * Codec PENDOWN irq handler |
289 | * |
290 | */ |
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(lock: &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(wq: wm->ts_workq, dwork: &wm->ts_reader, delay: 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 | */ |
353 | static int wm97xx_init_pen_irq(struct wm97xx *wm) |
354 | { |
355 | u16 reg; |
356 | |
357 | if (request_threaded_irq(irq: wm->pen_irq, NULL, thread_fn: wm97xx_pen_interrupt, |
358 | IRQF_SHARED | IRQF_ONESHOT, |
359 | name: "wm97xx-pen" , dev: 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 | |
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(dev: wm->input_dev, ABS_PRESSURE, value: 0); |
396 | input_report_key(dev: wm->input_dev, BTN_TOUCH, value: 0); |
397 | input_sync(dev: 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(dev: wm->input_dev, ABS_X, value: data.x & 0xfff); |
429 | input_report_abs(dev: wm->input_dev, ABS_Y, value: data.y & 0xfff); |
430 | input_report_abs(dev: wm->input_dev, ABS_PRESSURE, value: data.p & 0xfff); |
431 | input_report_key(dev: wm->input_dev, BTN_TOUCH, value: 1); |
432 | input_sync(dev: 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(lock: &wm->codec_mutex); |
443 | return rc; |
444 | } |
445 | |
446 | /* |
447 | * The touchscreen sample reader. |
448 | */ |
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(wq: wm->ts_workq, dwork: &wm->ts_reader, |
462 | delay: 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 | */ |
472 | static int wm97xx_ts_input_open(struct input_dev *idev) |
473 | { |
474 | struct wm97xx *wm = input_get_drvdata(dev: 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(wq: wm->ts_workq, dwork: &wm->ts_reader, |
506 | delay: 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 | |
520 | static void wm97xx_ts_input_close(struct input_dev *idev) |
521 | { |
522 | struct wm97xx *wm = input_get_drvdata(dev: 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(dwork: &wm->ts_reader); |
543 | |
544 | destroy_workqueue(wq: 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 | |
552 | static int wm97xx_register_touch(struct wm97xx *wm) |
553 | { |
554 | struct wm97xx_pdata *pdata = dev_get_platdata(dev: 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(dev: wm->input_dev, ABS_X, min: abs_x[0], max: abs_x[1], |
572 | fuzz: abs_x[2], flat: 0); |
573 | input_set_abs_params(dev: wm->input_dev, ABS_Y, min: abs_y[0], max: abs_y[1], |
574 | fuzz: abs_y[2], flat: 0); |
575 | input_set_abs_params(dev: wm->input_dev, ABS_PRESSURE, min: abs_p[0], max: abs_p[1], |
576 | fuzz: abs_p[2], flat: 0); |
577 | |
578 | input_set_drvdata(dev: wm->input_dev, data: 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(name: "wm97xx-touch" , id: -1); |
590 | if (!wm->touch_dev) |
591 | return -ENOMEM; |
592 | |
593 | platform_set_drvdata(pdev: wm->touch_dev, data: wm); |
594 | wm->touch_dev->dev.parent = wm->dev; |
595 | wm->touch_dev->dev.platform_data = pdata; |
596 | ret = platform_device_add(pdev: wm->touch_dev); |
597 | if (ret < 0) |
598 | goto touch_reg_err; |
599 | |
600 | return 0; |
601 | touch_reg_err: |
602 | platform_device_put(pdev: wm->touch_dev); |
603 | |
604 | return ret; |
605 | } |
606 | |
607 | static void wm97xx_unregister_touch(struct wm97xx *wm) |
608 | { |
609 | platform_device_unregister(wm->touch_dev); |
610 | } |
611 | |
612 | static int _wm97xx_probe(struct wm97xx *wm) |
613 | { |
614 | int id = 0; |
615 | |
616 | mutex_init(&wm->codec_mutex); |
617 | dev_set_drvdata(dev: wm->dev, data: 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 | |
669 | static void wm97xx_remove_battery(struct wm97xx *wm) |
670 | { |
671 | platform_device_unregister(wm->battery_dev); |
672 | } |
673 | |
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(name: "wm97xx-battery" , id: -1); |
680 | if (!wm->battery_dev) |
681 | return -ENOMEM; |
682 | |
683 | platform_set_drvdata(pdev: wm->battery_dev, data: wm); |
684 | wm->battery_dev->dev.parent = wm->dev; |
685 | wm->battery_dev->dev.platform_data = pdata; |
686 | ret = platform_device_add(pdev: wm->battery_dev); |
687 | if (ret) |
688 | platform_device_put(pdev: wm->battery_dev); |
689 | |
690 | return ret; |
691 | } |
692 | |
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, size: 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 ? 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 | |
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 | |
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(dev: &pdev->dev); |
735 | int ret; |
736 | |
737 | wm = devm_kzalloc(dev: &pdev->dev, size: 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, pdata: 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 | |
759 | static void wm97xx_mfd_remove(struct platform_device *pdev) |
760 | { |
761 | wm97xx_remove(dev: &pdev->dev); |
762 | } |
763 | |
764 | static int wm97xx_suspend(struct device *dev) |
765 | { |
766 | struct wm97xx *wm = dev_get_drvdata(dev); |
767 | u16 reg; |
768 | int suspend_mode; |
769 | |
770 | if (device_may_wakeup(dev: &wm->input_dev->dev)) |
771 | suspend_mode = wm->suspend_mode; |
772 | else |
773 | suspend_mode = 0; |
774 | |
775 | mutex_lock(&wm->input_dev->mutex); |
776 | if (input_device_enabled(dev: wm->input_dev)) |
777 | cancel_delayed_work_sync(dwork: &wm->ts_reader); |
778 | |
779 | /* Power down the digitiser (bypassing the cache for resume) */ |
780 | reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); |
781 | reg &= ~WM97XX_PRP_DET_DIG; |
782 | if (input_device_enabled(dev: wm->input_dev)) |
783 | reg |= suspend_mode; |
784 | wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); |
785 | |
786 | /* WM9713 has an additional power bit - turn it off if there |
787 | * are no users or if suspend mode is zero. */ |
788 | if (wm->id == WM9713_ID2 && |
789 | (!input_device_enabled(dev: wm->input_dev) || !suspend_mode)) { |
790 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; |
791 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); |
792 | } |
793 | mutex_unlock(lock: &wm->input_dev->mutex); |
794 | |
795 | return 0; |
796 | } |
797 | |
798 | static int wm97xx_resume(struct device *dev) |
799 | { |
800 | struct wm97xx *wm = dev_get_drvdata(dev); |
801 | |
802 | mutex_lock(&wm->input_dev->mutex); |
803 | /* restore digitiser and gpios */ |
804 | if (wm->id == WM9713_ID2) { |
805 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); |
806 | wm97xx_reg_write(wm, 0x5a, wm->misc); |
807 | if (input_device_enabled(dev: wm->input_dev)) { |
808 | u16 reg; |
809 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; |
810 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); |
811 | } |
812 | } |
813 | |
814 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); |
815 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); |
816 | |
817 | wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); |
818 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); |
819 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); |
820 | wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); |
821 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); |
822 | wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); |
823 | |
824 | if (input_device_enabled(dev: wm->input_dev) && !wm->pen_irq) { |
825 | wm->ts_reader_interval = wm->ts_reader_min_interval; |
826 | queue_delayed_work(wq: wm->ts_workq, dwork: &wm->ts_reader, |
827 | delay: wm->ts_reader_interval); |
828 | } |
829 | mutex_unlock(lock: &wm->input_dev->mutex); |
830 | |
831 | return 0; |
832 | } |
833 | |
834 | static DEFINE_SIMPLE_DEV_PM_OPS(wm97xx_pm_ops, wm97xx_suspend, wm97xx_resume); |
835 | |
836 | /* |
837 | * Machine specific operations |
838 | */ |
839 | int wm97xx_register_mach_ops(struct wm97xx *wm, |
840 | struct wm97xx_mach_ops *mach_ops) |
841 | { |
842 | mutex_lock(&wm->codec_mutex); |
843 | if (wm->mach_ops) { |
844 | mutex_unlock(lock: &wm->codec_mutex); |
845 | return -EINVAL; |
846 | } |
847 | wm->mach_ops = mach_ops; |
848 | mutex_unlock(lock: &wm->codec_mutex); |
849 | |
850 | return 0; |
851 | } |
852 | EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); |
853 | |
854 | void wm97xx_unregister_mach_ops(struct wm97xx *wm) |
855 | { |
856 | mutex_lock(&wm->codec_mutex); |
857 | wm->mach_ops = NULL; |
858 | mutex_unlock(lock: &wm->codec_mutex); |
859 | } |
860 | EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); |
861 | |
862 | static struct device_driver wm97xx_driver = { |
863 | .name = "wm97xx-ts" , |
864 | #ifdef CONFIG_AC97_BUS |
865 | .bus = &ac97_bus_type, |
866 | #endif |
867 | .owner = THIS_MODULE, |
868 | .probe = wm97xx_probe, |
869 | .remove = wm97xx_remove, |
870 | .pm = pm_sleep_ptr(&wm97xx_pm_ops), |
871 | }; |
872 | |
873 | static struct platform_driver wm97xx_mfd_driver = { |
874 | .driver = { |
875 | .name = "wm97xx-ts" , |
876 | .pm = pm_sleep_ptr(&wm97xx_pm_ops), |
877 | }, |
878 | .probe = wm97xx_mfd_probe, |
879 | .remove_new = wm97xx_mfd_remove, |
880 | }; |
881 | |
882 | static int __init wm97xx_init(void) |
883 | { |
884 | int ret; |
885 | |
886 | ret = platform_driver_register(&wm97xx_mfd_driver); |
887 | if (ret) |
888 | return ret; |
889 | |
890 | if (IS_BUILTIN(CONFIG_AC97_BUS)) |
891 | ret = driver_register(drv: &wm97xx_driver); |
892 | return ret; |
893 | } |
894 | |
895 | static void __exit wm97xx_exit(void) |
896 | { |
897 | if (IS_BUILTIN(CONFIG_AC97_BUS)) |
898 | driver_unregister(drv: &wm97xx_driver); |
899 | platform_driver_unregister(&wm97xx_mfd_driver); |
900 | } |
901 | |
902 | module_init(wm97xx_init); |
903 | module_exit(wm97xx_exit); |
904 | |
905 | /* Module information */ |
906 | MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>" ); |
907 | MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver" ); |
908 | MODULE_LICENSE("GPL" ); |
909 | |