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febf1dff MB |
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 | |
7 | * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com | |
8 | * Parts Copyright : Ian Molton <spyro@f2s.com> | |
9 | * Andrew Zabolotny <zap@homelink.ru> | |
10 | * Russell King <rmk@arm.linux.org.uk> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * Notes: | |
18 | * | |
19 | * Features: | |
20 | * - supports WM9705, WM9712, WM9713 | |
21 | * - polling mode | |
22 | * - continuous mode (arch-dependent) | |
23 | * - adjustable rpu/dpp settings | |
24 | * - adjustable pressure current | |
25 | * - adjustable sample settle delay | |
26 | * - 4 and 5 wire touchscreens (5 wire is WM9712 only) | |
27 | * - pen down detection | |
28 | * - battery monitor | |
29 | * - sample AUX adcs | |
30 | * - power management | |
31 | * - codec GPIO | |
32 | * - codec event notification | |
33 | * Todo | |
34 | * - Support for async sampling control for noisy LCDs. | |
35 | * | |
36 | */ | |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/version.h> | |
41 | #include <linux/kernel.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/delay.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/pm.h> | |
47 | #include <linux/interrupt.h> | |
48 | #include <linux/bitops.h> | |
49 | #include <linux/workqueue.h> | |
50 | #include <linux/wm97xx.h> | |
51 | #include <linux/uaccess.h> | |
52 | #include <linux/io.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.txt for more details. | |
72 | */ | |
73 | ||
74 | static int abs_x[3] = {350, 3900, 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] = {320, 3750, 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 | ||
130 | /* get codec */ | |
131 | mutex_lock(&wm->codec_mutex); | |
132 | ||
133 | /* When the touchscreen is not in use, we may have to power up | |
134 | * the AUX ADC before we can use sample the AUX inputs-> | |
135 | */ | |
136 | if (wm->id == WM9713_ID2 && | |
137 | (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { | |
138 | power_adc = 1; | |
139 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); | |
140 | } | |
141 | ||
142 | /* Prepare the codec for AUX reading */ | |
143 | wm->codec->aux_prepare(wm); | |
144 | ||
145 | /* Turn polling mode on to read AUX ADC */ | |
146 | wm->pen_probably_down = 1; | |
147 | wm->codec->poll_sample(wm, adcsel, &auxval); | |
148 | ||
149 | if (power_adc) | |
150 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); | |
151 | ||
152 | wm->codec->dig_restore(wm); | |
153 | ||
154 | wm->pen_probably_down = 0; | |
155 | ||
156 | mutex_unlock(&wm->codec_mutex); | |
157 | return auxval & 0xfff; | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); | |
160 | ||
161 | /** | |
162 | * wm97xx_get_gpio - Get the status of a codec GPIO. | |
163 | * @wm: wm97xx device. | |
164 | * @gpio: gpio | |
165 | * | |
166 | * Get the status of a codec GPIO pin | |
167 | */ | |
168 | ||
169 | enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) | |
170 | { | |
171 | u16 status; | |
172 | enum wm97xx_gpio_status ret; | |
173 | ||
174 | mutex_lock(&wm->codec_mutex); | |
175 | status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
176 | ||
177 | if (status & gpio) | |
178 | ret = WM97XX_GPIO_HIGH; | |
179 | else | |
180 | ret = WM97XX_GPIO_LOW; | |
181 | ||
182 | mutex_unlock(&wm->codec_mutex); | |
183 | return ret; | |
184 | } | |
185 | EXPORT_SYMBOL_GPL(wm97xx_get_gpio); | |
186 | ||
187 | /** | |
188 | * wm97xx_set_gpio - Set the status of a codec GPIO. | |
189 | * @wm: wm97xx device. | |
190 | * @gpio: gpio | |
191 | * | |
192 | * | |
193 | * Set the status of a codec GPIO pin | |
194 | */ | |
195 | ||
196 | void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, | |
197 | enum wm97xx_gpio_status status) | |
198 | { | |
199 | u16 reg; | |
200 | ||
201 | mutex_lock(&wm->codec_mutex); | |
202 | reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
203 | ||
204 | if (status & WM97XX_GPIO_HIGH) | |
205 | reg |= gpio; | |
206 | else | |
207 | reg &= ~gpio; | |
208 | ||
209 | if (wm->id == WM9712_ID2) | |
210 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); | |
211 | else | |
212 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); | |
213 | mutex_unlock(&wm->codec_mutex); | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(wm97xx_set_gpio); | |
216 | ||
217 | /* | |
218 | * Codec GPIO pin configuration, this sets pin direction, polarity, | |
219 | * stickyness and wake up. | |
220 | */ | |
221 | void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, | |
222 | enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, | |
223 | enum wm97xx_gpio_wake wake) | |
224 | { | |
225 | u16 reg; | |
226 | ||
227 | mutex_lock(&wm->codec_mutex); | |
228 | reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); | |
229 | ||
230 | if (pol == WM97XX_GPIO_POL_HIGH) | |
231 | reg |= gpio; | |
232 | else | |
233 | reg &= ~gpio; | |
234 | ||
235 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); | |
236 | reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); | |
237 | ||
238 | if (sticky == WM97XX_GPIO_STICKY) | |
239 | reg |= gpio; | |
240 | else | |
241 | reg &= ~gpio; | |
242 | ||
243 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); | |
244 | reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); | |
245 | ||
246 | if (wake == WM97XX_GPIO_WAKE) | |
247 | reg |= gpio; | |
248 | else | |
249 | reg &= ~gpio; | |
250 | ||
251 | wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); | |
252 | reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); | |
253 | ||
254 | if (dir == WM97XX_GPIO_IN) | |
255 | reg |= gpio; | |
256 | else | |
257 | reg &= ~gpio; | |
258 | ||
259 | wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); | |
260 | mutex_unlock(&wm->codec_mutex); | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(wm97xx_config_gpio); | |
263 | ||
34d27853 MB |
264 | /* |
265 | * Configure the WM97XX_PRP value to use while system is suspended. | |
266 | * If a value other than 0 is set then WM97xx pen detection will be | |
267 | * left enabled in the configured mode while the system is in suspend, | |
268 | * the device has users and suspend has not been disabled via the | |
269 | * wakeup sysfs entries. | |
270 | * | |
271 | * @wm: WM97xx device to configure | |
272 | * @mode: WM97XX_PRP value to configure while suspended | |
273 | */ | |
274 | void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) | |
275 | { | |
276 | wm->suspend_mode = mode; | |
277 | device_init_wakeup(&wm->input_dev->dev, mode != 0); | |
278 | } | |
279 | EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); | |
280 | ||
febf1dff MB |
281 | /* |
282 | * Handle a pen down interrupt. | |
283 | */ | |
284 | static void wm97xx_pen_irq_worker(struct work_struct *work) | |
285 | { | |
286 | struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); | |
287 | int pen_was_down = wm->pen_is_down; | |
288 | ||
289 | /* do we need to enable the touch panel reader */ | |
290 | if (wm->id == WM9705_ID2) { | |
291 | if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & | |
292 | WM97XX_PEN_DOWN) | |
293 | wm->pen_is_down = 1; | |
294 | else | |
295 | wm->pen_is_down = 0; | |
296 | } else { | |
297 | u16 status, pol; | |
298 | mutex_lock(&wm->codec_mutex); | |
299 | status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
300 | pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); | |
301 | ||
302 | if (WM97XX_GPIO_13 & pol & status) { | |
303 | wm->pen_is_down = 1; | |
304 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & | |
305 | ~WM97XX_GPIO_13); | |
306 | } else { | |
307 | wm->pen_is_down = 0; | |
308 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | | |
309 | WM97XX_GPIO_13); | |
310 | } | |
311 | ||
312 | if (wm->id == WM9712_ID2) | |
313 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & | |
314 | ~WM97XX_GPIO_13) << 1); | |
315 | else | |
316 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & | |
317 | ~WM97XX_GPIO_13); | |
318 | mutex_unlock(&wm->codec_mutex); | |
319 | } | |
320 | ||
321 | /* If the system is not using continuous mode or it provides a | |
322 | * pen down operation then we need to schedule polls while the | |
323 | * pen is down. Otherwise the machine driver is responsible | |
324 | * for scheduling reads. | |
325 | */ | |
326 | if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { | |
327 | if (wm->pen_is_down && !pen_was_down) { | |
328 | /* Data is not availiable immediately on pen down */ | |
329 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); | |
330 | } | |
331 | ||
332 | /* Let ts_reader report the pen up for debounce. */ | |
333 | if (!wm->pen_is_down && pen_was_down) | |
334 | wm->pen_is_down = 1; | |
335 | } | |
336 | ||
337 | if (!wm->pen_is_down && wm->mach_ops->acc_enabled) | |
338 | wm->mach_ops->acc_pen_up(wm); | |
339 | ||
340 | wm->mach_ops->irq_enable(wm, 1); | |
341 | } | |
342 | ||
343 | /* | |
344 | * Codec PENDOWN irq handler | |
345 | * | |
346 | * We have to disable the codec interrupt in the handler because it | |
347 | * can take upto 1ms to clear the interrupt source. We schedule a task | |
d808fbe5 MB |
348 | * in a work queue to do the actual interaction with the chip. The |
349 | * interrupt is then enabled again in the slow handler when the source | |
350 | * has been cleared. | |
febf1dff MB |
351 | */ |
352 | static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) | |
353 | { | |
354 | struct wm97xx *wm = dev_id; | |
355 | ||
d808fbe5 MB |
356 | if (!work_pending(&wm->pen_event_work)) { |
357 | wm->mach_ops->irq_enable(wm, 0); | |
358 | queue_work(wm->ts_workq, &wm->pen_event_work); | |
359 | } | |
febf1dff MB |
360 | |
361 | return IRQ_HANDLED; | |
362 | } | |
363 | ||
364 | /* | |
365 | * initialise pen IRQ handler and workqueue | |
366 | */ | |
367 | static int wm97xx_init_pen_irq(struct wm97xx *wm) | |
368 | { | |
369 | u16 reg; | |
370 | ||
371 | /* If an interrupt is supplied an IRQ enable operation must also be | |
372 | * provided. */ | |
373 | BUG_ON(!wm->mach_ops->irq_enable); | |
374 | ||
db7c10e7 MB |
375 | if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, |
376 | IRQF_SHARED | IRQF_SAMPLE_RANDOM, | |
febf1dff MB |
377 | "wm97xx-pen", wm)) { |
378 | dev_err(wm->dev, | |
379 | "Failed to register pen down interrupt, polling"); | |
380 | wm->pen_irq = 0; | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
384 | /* Configure GPIO as interrupt source on WM971x */ | |
385 | if (wm->id != WM9705_ID2) { | |
386 | BUG_ON(!wm->mach_ops->irq_gpio); | |
387 | reg = wm97xx_reg_read(wm, AC97_MISC_AFE); | |
388 | wm97xx_reg_write(wm, AC97_MISC_AFE, | |
389 | reg & ~(wm->mach_ops->irq_gpio)); | |
390 | reg = wm97xx_reg_read(wm, 0x5a); | |
391 | wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); | |
392 | } | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | static int wm97xx_read_samples(struct wm97xx *wm) | |
398 | { | |
399 | struct wm97xx_data data; | |
400 | int rc; | |
401 | ||
402 | mutex_lock(&wm->codec_mutex); | |
403 | ||
404 | if (wm->mach_ops && wm->mach_ops->acc_enabled) | |
405 | rc = wm->mach_ops->acc_pen_down(wm); | |
406 | else | |
407 | rc = wm->codec->poll_touch(wm, &data); | |
408 | ||
409 | if (rc & RC_PENUP) { | |
410 | if (wm->pen_is_down) { | |
411 | wm->pen_is_down = 0; | |
412 | dev_dbg(wm->dev, "pen up\n"); | |
413 | input_report_abs(wm->input_dev, ABS_PRESSURE, 0); | |
414 | input_sync(wm->input_dev); | |
415 | } else if (!(rc & RC_AGAIN)) { | |
416 | /* We need high frequency updates only while | |
417 | * pen is down, the user never will be able to | |
418 | * touch screen faster than a few times per | |
419 | * second... On the other hand, when the user | |
420 | * is actively working with the touchscreen we | |
421 | * don't want to lose the quick response. So we | |
422 | * will slowly increase sleep time after the | |
423 | * pen is up and quicky restore it to ~one task | |
424 | * switch when pen is down again. | |
425 | */ | |
426 | if (wm->ts_reader_interval < HZ / 10) | |
427 | wm->ts_reader_interval++; | |
428 | } | |
429 | ||
430 | } else if (rc & RC_VALID) { | |
431 | dev_dbg(wm->dev, | |
432 | "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", | |
433 | data.x >> 12, data.x & 0xfff, data.y >> 12, | |
434 | data.y & 0xfff, data.p >> 12, data.p & 0xfff); | |
435 | input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); | |
436 | input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); | |
437 | input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); | |
438 | input_sync(wm->input_dev); | |
439 | wm->pen_is_down = 1; | |
440 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
441 | } else if (rc & RC_PENDOWN) { | |
442 | dev_dbg(wm->dev, "pen down\n"); | |
443 | wm->pen_is_down = 1; | |
444 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
445 | } | |
446 | ||
447 | mutex_unlock(&wm->codec_mutex); | |
448 | return rc; | |
449 | } | |
450 | ||
451 | /* | |
452 | * The touchscreen sample reader. | |
453 | */ | |
454 | static void wm97xx_ts_reader(struct work_struct *work) | |
455 | { | |
456 | int rc; | |
457 | struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); | |
458 | ||
459 | BUG_ON(!wm->codec); | |
460 | ||
461 | do { | |
462 | rc = wm97xx_read_samples(wm); | |
463 | } while (rc & RC_AGAIN); | |
464 | ||
465 | if (wm->pen_is_down || !wm->pen_irq) | |
466 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, | |
467 | wm->ts_reader_interval); | |
468 | } | |
469 | ||
470 | /** | |
471 | * wm97xx_ts_input_open - Open the touch screen input device. | |
472 | * @idev: Input device to be opened. | |
473 | * | |
474 | * Called by the input sub system to open a wm97xx touchscreen device. | |
475 | * Starts the touchscreen thread and touch digitiser. | |
476 | */ | |
477 | static int wm97xx_ts_input_open(struct input_dev *idev) | |
478 | { | |
479 | struct wm97xx *wm = input_get_drvdata(idev); | |
480 | ||
481 | wm->ts_workq = create_singlethread_workqueue("kwm97xx"); | |
482 | if (wm->ts_workq == NULL) { | |
483 | dev_err(wm->dev, | |
484 | "Failed to create workqueue\n"); | |
485 | return -EINVAL; | |
486 | } | |
487 | ||
488 | /* start digitiser */ | |
489 | if (wm->mach_ops && wm->mach_ops->acc_enabled) | |
490 | wm->codec->acc_enable(wm, 1); | |
491 | wm->codec->dig_enable(wm, 1); | |
492 | ||
493 | INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); | |
494 | INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); | |
495 | ||
496 | wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; | |
497 | if (wm->ts_reader_min_interval < 1) | |
498 | wm->ts_reader_min_interval = 1; | |
499 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
500 | ||
501 | wm->pen_is_down = 0; | |
502 | if (wm->pen_irq) | |
503 | wm97xx_init_pen_irq(wm); | |
504 | else | |
505 | dev_err(wm->dev, "No IRQ specified\n"); | |
506 | ||
507 | /* If we either don't have an interrupt for pen down events or | |
508 | * failed to acquire it then we need to poll. | |
509 | */ | |
510 | if (wm->pen_irq == 0) | |
511 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, | |
512 | wm->ts_reader_interval); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | /** | |
518 | * wm97xx_ts_input_close - Close the touch screen input device. | |
519 | * @idev: Input device to be closed. | |
520 | * | |
521 | * Called by the input sub system to close a wm97xx touchscreen | |
522 | * device. Kills the touchscreen thread and stops the touch | |
523 | * digitiser. | |
524 | */ | |
525 | ||
526 | static void wm97xx_ts_input_close(struct input_dev *idev) | |
527 | { | |
528 | struct wm97xx *wm = input_get_drvdata(idev); | |
529 | u16 reg; | |
530 | ||
531 | if (wm->pen_irq) { | |
532 | /* Return the interrupt to GPIO usage (disabling it) */ | |
533 | if (wm->id != WM9705_ID2) { | |
534 | BUG_ON(!wm->mach_ops->irq_gpio); | |
535 | reg = wm97xx_reg_read(wm, AC97_MISC_AFE); | |
536 | wm97xx_reg_write(wm, AC97_MISC_AFE, | |
537 | reg | wm->mach_ops->irq_gpio); | |
538 | } | |
539 | ||
540 | free_irq(wm->pen_irq, wm); | |
541 | } | |
542 | ||
543 | wm->pen_is_down = 0; | |
544 | ||
545 | /* Balance out interrupt disables/enables */ | |
546 | if (cancel_work_sync(&wm->pen_event_work)) | |
547 | wm->mach_ops->irq_enable(wm, 1); | |
548 | ||
549 | /* ts_reader rearms itself so we need to explicitly stop it | |
550 | * before we destroy the workqueue. | |
551 | */ | |
552 | cancel_delayed_work_sync(&wm->ts_reader); | |
553 | ||
554 | destroy_workqueue(wm->ts_workq); | |
555 | ||
556 | /* stop digitiser */ | |
557 | wm->codec->dig_enable(wm, 0); | |
558 | if (wm->mach_ops && wm->mach_ops->acc_enabled) | |
559 | wm->codec->acc_enable(wm, 0); | |
560 | } | |
561 | ||
562 | static int wm97xx_probe(struct device *dev) | |
563 | { | |
564 | struct wm97xx *wm; | |
565 | int ret = 0, id = 0; | |
566 | ||
567 | wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); | |
568 | if (!wm) | |
569 | return -ENOMEM; | |
570 | mutex_init(&wm->codec_mutex); | |
571 | ||
572 | wm->dev = dev; | |
573 | dev->driver_data = wm; | |
574 | wm->ac97 = to_ac97_t(dev); | |
575 | ||
576 | /* check that we have a supported codec */ | |
577 | id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); | |
578 | if (id != WM97XX_ID1) { | |
579 | dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); | |
580 | ret = -ENODEV; | |
581 | goto alloc_err; | |
582 | } | |
583 | ||
584 | wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); | |
585 | ||
586 | dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); | |
587 | ||
588 | switch (wm->id & 0xff) { | |
589 | #ifdef CONFIG_TOUCHSCREEN_WM9705 | |
590 | case 0x05: | |
591 | wm->codec = &wm9705_codec; | |
592 | break; | |
593 | #endif | |
594 | #ifdef CONFIG_TOUCHSCREEN_WM9712 | |
595 | case 0x12: | |
596 | wm->codec = &wm9712_codec; | |
597 | break; | |
598 | #endif | |
599 | #ifdef CONFIG_TOUCHSCREEN_WM9713 | |
600 | case 0x13: | |
601 | wm->codec = &wm9713_codec; | |
602 | break; | |
603 | #endif | |
604 | default: | |
605 | dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", | |
606 | wm->id & 0xff); | |
607 | ret = -ENODEV; | |
608 | goto alloc_err; | |
609 | } | |
610 | ||
611 | wm->input_dev = input_allocate_device(); | |
612 | if (wm->input_dev == NULL) { | |
613 | ret = -ENOMEM; | |
614 | goto alloc_err; | |
615 | } | |
616 | ||
617 | /* set up touch configuration */ | |
618 | wm->input_dev->name = "wm97xx touchscreen"; | |
619 | wm->input_dev->open = wm97xx_ts_input_open; | |
620 | wm->input_dev->close = wm97xx_ts_input_close; | |
621 | set_bit(EV_ABS, wm->input_dev->evbit); | |
622 | set_bit(ABS_X, wm->input_dev->absbit); | |
623 | set_bit(ABS_Y, wm->input_dev->absbit); | |
624 | set_bit(ABS_PRESSURE, wm->input_dev->absbit); | |
625 | input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], | |
626 | abs_x[2], 0); | |
627 | input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], | |
628 | abs_y[2], 0); | |
629 | input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], | |
630 | abs_p[2], 0); | |
631 | input_set_drvdata(wm->input_dev, wm); | |
632 | wm->input_dev->dev.parent = dev; | |
633 | ret = input_register_device(wm->input_dev); | |
634 | if (ret < 0) | |
635 | goto dev_alloc_err; | |
636 | ||
637 | /* set up physical characteristics */ | |
638 | wm->codec->phy_init(wm); | |
639 | ||
640 | /* load gpio cache */ | |
641 | wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); | |
642 | wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); | |
643 | wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); | |
644 | wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); | |
645 | wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
646 | wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); | |
647 | ||
648 | /* register our battery device */ | |
649 | wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); | |
650 | if (!wm->battery_dev) { | |
651 | ret = -ENOMEM; | |
652 | goto batt_err; | |
653 | } | |
654 | platform_set_drvdata(wm->battery_dev, wm); | |
655 | wm->battery_dev->dev.parent = dev; | |
656 | ret = platform_device_add(wm->battery_dev); | |
657 | if (ret < 0) | |
658 | goto batt_reg_err; | |
659 | ||
660 | /* register our extended touch device (for machine specific | |
661 | * extensions) */ | |
662 | wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); | |
663 | if (!wm->touch_dev) { | |
664 | ret = -ENOMEM; | |
665 | goto touch_err; | |
666 | } | |
667 | platform_set_drvdata(wm->touch_dev, wm); | |
668 | wm->touch_dev->dev.parent = dev; | |
669 | ret = platform_device_add(wm->touch_dev); | |
670 | if (ret < 0) | |
671 | goto touch_reg_err; | |
672 | ||
673 | return ret; | |
674 | ||
675 | touch_reg_err: | |
676 | platform_device_put(wm->touch_dev); | |
677 | touch_err: | |
678 | platform_device_unregister(wm->battery_dev); | |
679 | wm->battery_dev = NULL; | |
680 | batt_reg_err: | |
681 | platform_device_put(wm->battery_dev); | |
682 | batt_err: | |
683 | input_unregister_device(wm->input_dev); | |
684 | wm->input_dev = NULL; | |
685 | dev_alloc_err: | |
686 | input_free_device(wm->input_dev); | |
687 | alloc_err: | |
688 | kfree(wm); | |
689 | ||
690 | return ret; | |
691 | } | |
692 | ||
693 | static int wm97xx_remove(struct device *dev) | |
694 | { | |
695 | struct wm97xx *wm = dev_get_drvdata(dev); | |
696 | ||
697 | platform_device_unregister(wm->battery_dev); | |
698 | platform_device_unregister(wm->touch_dev); | |
699 | input_unregister_device(wm->input_dev); | |
700 | kfree(wm); | |
701 | ||
702 | return 0; | |
703 | } | |
704 | ||
705 | #ifdef CONFIG_PM | |
706 | static int wm97xx_suspend(struct device *dev, pm_message_t state) | |
707 | { | |
708 | struct wm97xx *wm = dev_get_drvdata(dev); | |
34d27853 MB |
709 | u16 reg; |
710 | int suspend_mode; | |
711 | ||
712 | if (device_may_wakeup(&wm->input_dev->dev)) | |
713 | suspend_mode = wm->suspend_mode; | |
714 | else | |
715 | suspend_mode = 0; | |
febf1dff MB |
716 | |
717 | if (wm->input_dev->users) | |
718 | cancel_delayed_work_sync(&wm->ts_reader); | |
719 | ||
34d27853 MB |
720 | /* Power down the digitiser (bypassing the cache for resume) */ |
721 | reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); | |
722 | reg &= ~WM97XX_PRP_DET_DIG; | |
723 | if (wm->input_dev->users) | |
724 | reg |= suspend_mode; | |
725 | wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); | |
726 | ||
727 | /* WM9713 has an additional power bit - turn it off if there | |
728 | * are no users or if suspend mode is zero. */ | |
729 | if (wm->id == WM9713_ID2 && | |
730 | (!wm->input_dev->users || !suspend_mode)) { | |
731 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; | |
732 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); | |
733 | } | |
734 | ||
febf1dff MB |
735 | return 0; |
736 | } | |
737 | ||
738 | static int wm97xx_resume(struct device *dev) | |
739 | { | |
740 | struct wm97xx *wm = dev_get_drvdata(dev); | |
741 | ||
742 | /* restore digitiser and gpios */ | |
743 | if (wm->id == WM9713_ID2) { | |
744 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); | |
745 | wm97xx_reg_write(wm, 0x5a, wm->misc); | |
746 | if (wm->input_dev->users) { | |
747 | u16 reg; | |
748 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; | |
749 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); | |
750 | } | |
751 | } | |
752 | ||
753 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); | |
754 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); | |
755 | ||
756 | wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); | |
757 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); | |
758 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); | |
759 | wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); | |
760 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); | |
761 | wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); | |
762 | ||
763 | if (wm->input_dev->users && !wm->pen_irq) { | |
764 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
765 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, | |
766 | wm->ts_reader_interval); | |
767 | } | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | #else | |
773 | #define wm97xx_suspend NULL | |
774 | #define wm97xx_resume NULL | |
775 | #endif | |
776 | ||
777 | /* | |
778 | * Machine specific operations | |
779 | */ | |
780 | int wm97xx_register_mach_ops(struct wm97xx *wm, | |
781 | struct wm97xx_mach_ops *mach_ops) | |
782 | { | |
783 | mutex_lock(&wm->codec_mutex); | |
784 | if (wm->mach_ops) { | |
785 | mutex_unlock(&wm->codec_mutex); | |
786 | return -EINVAL; | |
787 | } | |
788 | wm->mach_ops = mach_ops; | |
789 | mutex_unlock(&wm->codec_mutex); | |
790 | ||
791 | return 0; | |
792 | } | |
793 | EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); | |
794 | ||
795 | void wm97xx_unregister_mach_ops(struct wm97xx *wm) | |
796 | { | |
797 | mutex_lock(&wm->codec_mutex); | |
798 | wm->mach_ops = NULL; | |
799 | mutex_unlock(&wm->codec_mutex); | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); | |
802 | ||
803 | static struct device_driver wm97xx_driver = { | |
804 | .name = "ac97", | |
805 | .bus = &ac97_bus_type, | |
806 | .owner = THIS_MODULE, | |
807 | .probe = wm97xx_probe, | |
808 | .remove = wm97xx_remove, | |
809 | .suspend = wm97xx_suspend, | |
810 | .resume = wm97xx_resume, | |
811 | }; | |
812 | ||
813 | static int __init wm97xx_init(void) | |
814 | { | |
815 | return driver_register(&wm97xx_driver); | |
816 | } | |
817 | ||
818 | static void __exit wm97xx_exit(void) | |
819 | { | |
820 | driver_unregister(&wm97xx_driver); | |
821 | } | |
822 | ||
823 | module_init(wm97xx_init); | |
824 | module_exit(wm97xx_exit); | |
825 | ||
826 | /* Module information */ | |
827 | MODULE_AUTHOR("Liam Girdwood <liam.girdwood@wolfsonmicro.com>"); | |
828 | MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); | |
829 | MODULE_LICENSE("GPL"); |