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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. | |
b8d055a8 | 6 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
febf1dff MB |
7 | * Parts Copyright : Ian Molton <spyro@f2s.com> |
8 | * Andrew Zabolotny <zap@homelink.ru> | |
9 | * Russell King <rmk@arm.linux.org.uk> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * Notes: | |
17 | * | |
18 | * Features: | |
19 | * - supports WM9705, WM9712, WM9713 | |
20 | * - polling mode | |
21 | * - continuous mode (arch-dependent) | |
22 | * - adjustable rpu/dpp settings | |
23 | * - adjustable pressure current | |
24 | * - adjustable sample settle delay | |
25 | * - 4 and 5 wire touchscreens (5 wire is WM9712 only) | |
26 | * - pen down detection | |
27 | * - battery monitor | |
28 | * - sample AUX adcs | |
29 | * - power management | |
30 | * - codec GPIO | |
31 | * - codec event notification | |
32 | * Todo | |
33 | * - Support for async sampling control for noisy LCDs. | |
34 | * | |
35 | */ | |
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/moduleparam.h> | |
febf1dff MB |
39 | #include <linux/kernel.h> |
40 | #include <linux/init.h> | |
41 | #include <linux/delay.h> | |
42 | #include <linux/string.h> | |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/pm.h> | |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/bitops.h> | |
47 | #include <linux/workqueue.h> | |
48 | #include <linux/wm97xx.h> | |
49 | #include <linux/uaccess.h> | |
50 | #include <linux/io.h> | |
5a0e3ad6 | 51 | #include <linux/slab.h> |
febf1dff MB |
52 | |
53 | #define TS_NAME "wm97xx" | |
54 | #define WM_CORE_VERSION "1.00" | |
55 | #define DEFAULT_PRESSURE 0xb0c0 | |
56 | ||
57 | ||
58 | /* | |
59 | * Touchscreen absolute values | |
60 | * | |
61 | * These parameters are used to help the input layer discard out of | |
62 | * range readings and reduce jitter etc. | |
63 | * | |
64 | * o min, max:- indicate the min and max values your touch screen returns | |
65 | * o fuzz:- use a higher number to reduce jitter | |
66 | * | |
67 | * The default values correspond to Mainstone II in QVGA mode | |
68 | * | |
69 | * Please read | |
70 | * Documentation/input/input-programming.txt for more details. | |
71 | */ | |
72 | ||
73 | static int abs_x[3] = {350, 3900, 5}; | |
74 | module_param_array(abs_x, int, NULL, 0); | |
75 | MODULE_PARM_DESC(abs_x, "Touchscreen absolute X min, max, fuzz"); | |
76 | ||
77 | static int abs_y[3] = {320, 3750, 40}; | |
78 | module_param_array(abs_y, int, NULL, 0); | |
79 | MODULE_PARM_DESC(abs_y, "Touchscreen absolute Y min, max, fuzz"); | |
80 | ||
81 | static int abs_p[3] = {0, 150, 4}; | |
82 | module_param_array(abs_p, int, NULL, 0); | |
83 | MODULE_PARM_DESC(abs_p, "Touchscreen absolute Pressure min, max, fuzz"); | |
84 | ||
85 | /* | |
86 | * wm97xx IO access, all IO locking done by AC97 layer | |
87 | */ | |
88 | int wm97xx_reg_read(struct wm97xx *wm, u16 reg) | |
89 | { | |
90 | if (wm->ac97) | |
91 | return wm->ac97->bus->ops->read(wm->ac97, reg); | |
92 | else | |
93 | return -1; | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(wm97xx_reg_read); | |
96 | ||
97 | void wm97xx_reg_write(struct wm97xx *wm, u16 reg, u16 val) | |
98 | { | |
99 | /* cache digitiser registers */ | |
100 | if (reg >= AC97_WM9713_DIG1 && reg <= AC97_WM9713_DIG3) | |
101 | wm->dig[(reg - AC97_WM9713_DIG1) >> 1] = val; | |
102 | ||
103 | /* cache gpio regs */ | |
104 | if (reg >= AC97_GPIO_CFG && reg <= AC97_MISC_AFE) | |
105 | wm->gpio[(reg - AC97_GPIO_CFG) >> 1] = val; | |
106 | ||
107 | /* wm9713 irq reg */ | |
108 | if (reg == 0x5a) | |
109 | wm->misc = val; | |
110 | ||
111 | if (wm->ac97) | |
112 | wm->ac97->bus->ops->write(wm->ac97, reg, val); | |
113 | } | |
114 | EXPORT_SYMBOL_GPL(wm97xx_reg_write); | |
115 | ||
116 | /** | |
117 | * wm97xx_read_aux_adc - Read the aux adc. | |
118 | * @wm: wm97xx device. | |
119 | * @adcsel: codec ADC to be read | |
120 | * | |
121 | * Reads the selected AUX ADC. | |
122 | */ | |
123 | ||
124 | int wm97xx_read_aux_adc(struct wm97xx *wm, u16 adcsel) | |
125 | { | |
126 | int power_adc = 0, auxval; | |
127 | u16 power = 0; | |
eb54ddd4 EM |
128 | int rc = 0; |
129 | int timeout = 0; | |
febf1dff MB |
130 | |
131 | /* get codec */ | |
132 | mutex_lock(&wm->codec_mutex); | |
133 | ||
134 | /* When the touchscreen is not in use, we may have to power up | |
135 | * the AUX ADC before we can use sample the AUX inputs-> | |
136 | */ | |
137 | if (wm->id == WM9713_ID2 && | |
138 | (power = wm97xx_reg_read(wm, AC97_EXTENDED_MID)) & 0x8000) { | |
139 | power_adc = 1; | |
140 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, power & 0x7fff); | |
141 | } | |
142 | ||
143 | /* Prepare the codec for AUX reading */ | |
144 | wm->codec->aux_prepare(wm); | |
145 | ||
146 | /* Turn polling mode on to read AUX ADC */ | |
147 | wm->pen_probably_down = 1; | |
eb54ddd4 EM |
148 | |
149 | while (rc != RC_VALID && timeout++ < 5) | |
150 | rc = wm->codec->poll_sample(wm, adcsel, &auxval); | |
febf1dff MB |
151 | |
152 | if (power_adc) | |
153 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, power | 0x8000); | |
154 | ||
155 | wm->codec->dig_restore(wm); | |
156 | ||
157 | wm->pen_probably_down = 0; | |
158 | ||
eb54ddd4 EM |
159 | if (timeout >= 5) { |
160 | dev_err(wm->dev, | |
161 | "timeout reading auxadc %d, disabling digitiser\n", | |
162 | adcsel); | |
163 | wm->codec->dig_enable(wm, false); | |
164 | } | |
165 | ||
febf1dff | 166 | mutex_unlock(&wm->codec_mutex); |
eb54ddd4 | 167 | return (rc == RC_VALID ? auxval & 0xfff : -EBUSY); |
febf1dff MB |
168 | } |
169 | EXPORT_SYMBOL_GPL(wm97xx_read_aux_adc); | |
170 | ||
171 | /** | |
172 | * wm97xx_get_gpio - Get the status of a codec GPIO. | |
173 | * @wm: wm97xx device. | |
174 | * @gpio: gpio | |
175 | * | |
176 | * Get the status of a codec GPIO pin | |
177 | */ | |
178 | ||
179 | enum wm97xx_gpio_status wm97xx_get_gpio(struct wm97xx *wm, u32 gpio) | |
180 | { | |
181 | u16 status; | |
182 | enum wm97xx_gpio_status ret; | |
183 | ||
184 | mutex_lock(&wm->codec_mutex); | |
185 | status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
186 | ||
187 | if (status & gpio) | |
188 | ret = WM97XX_GPIO_HIGH; | |
189 | else | |
190 | ret = WM97XX_GPIO_LOW; | |
191 | ||
192 | mutex_unlock(&wm->codec_mutex); | |
193 | return ret; | |
194 | } | |
195 | EXPORT_SYMBOL_GPL(wm97xx_get_gpio); | |
196 | ||
197 | /** | |
198 | * wm97xx_set_gpio - Set the status of a codec GPIO. | |
199 | * @wm: wm97xx device. | |
200 | * @gpio: gpio | |
201 | * | |
202 | * | |
203 | * Set the status of a codec GPIO pin | |
204 | */ | |
205 | ||
206 | void wm97xx_set_gpio(struct wm97xx *wm, u32 gpio, | |
207 | enum wm97xx_gpio_status status) | |
208 | { | |
209 | u16 reg; | |
210 | ||
211 | mutex_lock(&wm->codec_mutex); | |
212 | reg = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
213 | ||
af8b01b0 | 214 | if (status == WM97XX_GPIO_HIGH) |
febf1dff MB |
215 | reg |= gpio; |
216 | else | |
217 | reg &= ~gpio; | |
218 | ||
99fde513 | 219 | if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) |
febf1dff MB |
220 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg << 1); |
221 | else | |
222 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, reg); | |
223 | mutex_unlock(&wm->codec_mutex); | |
224 | } | |
225 | EXPORT_SYMBOL_GPL(wm97xx_set_gpio); | |
226 | ||
227 | /* | |
228 | * Codec GPIO pin configuration, this sets pin direction, polarity, | |
229 | * stickyness and wake up. | |
230 | */ | |
231 | void wm97xx_config_gpio(struct wm97xx *wm, u32 gpio, enum wm97xx_gpio_dir dir, | |
232 | enum wm97xx_gpio_pol pol, enum wm97xx_gpio_sticky sticky, | |
233 | enum wm97xx_gpio_wake wake) | |
234 | { | |
235 | u16 reg; | |
236 | ||
237 | mutex_lock(&wm->codec_mutex); | |
238 | reg = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); | |
239 | ||
240 | if (pol == WM97XX_GPIO_POL_HIGH) | |
241 | reg |= gpio; | |
242 | else | |
243 | reg &= ~gpio; | |
244 | ||
245 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, reg); | |
246 | reg = wm97xx_reg_read(wm, AC97_GPIO_STICKY); | |
247 | ||
248 | if (sticky == WM97XX_GPIO_STICKY) | |
249 | reg |= gpio; | |
250 | else | |
251 | reg &= ~gpio; | |
252 | ||
253 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, reg); | |
254 | reg = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); | |
255 | ||
256 | if (wake == WM97XX_GPIO_WAKE) | |
257 | reg |= gpio; | |
258 | else | |
259 | reg &= ~gpio; | |
260 | ||
261 | wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, reg); | |
262 | reg = wm97xx_reg_read(wm, AC97_GPIO_CFG); | |
263 | ||
264 | if (dir == WM97XX_GPIO_IN) | |
265 | reg |= gpio; | |
266 | else | |
267 | reg &= ~gpio; | |
268 | ||
269 | wm97xx_reg_write(wm, AC97_GPIO_CFG, reg); | |
270 | mutex_unlock(&wm->codec_mutex); | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(wm97xx_config_gpio); | |
273 | ||
34d27853 MB |
274 | /* |
275 | * Configure the WM97XX_PRP value to use while system is suspended. | |
276 | * If a value other than 0 is set then WM97xx pen detection will be | |
277 | * left enabled in the configured mode while the system is in suspend, | |
278 | * the device has users and suspend has not been disabled via the | |
279 | * wakeup sysfs entries. | |
280 | * | |
281 | * @wm: WM97xx device to configure | |
282 | * @mode: WM97XX_PRP value to configure while suspended | |
283 | */ | |
284 | void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode) | |
285 | { | |
286 | wm->suspend_mode = mode; | |
287 | device_init_wakeup(&wm->input_dev->dev, mode != 0); | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode); | |
290 | ||
febf1dff MB |
291 | /* |
292 | * Handle a pen down interrupt. | |
293 | */ | |
294 | static void wm97xx_pen_irq_worker(struct work_struct *work) | |
295 | { | |
296 | struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work); | |
297 | int pen_was_down = wm->pen_is_down; | |
298 | ||
299 | /* do we need to enable the touch panel reader */ | |
300 | if (wm->id == WM9705_ID2) { | |
301 | if (wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD) & | |
302 | WM97XX_PEN_DOWN) | |
303 | wm->pen_is_down = 1; | |
304 | else | |
305 | wm->pen_is_down = 0; | |
306 | } else { | |
307 | u16 status, pol; | |
308 | mutex_lock(&wm->codec_mutex); | |
309 | status = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
310 | pol = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); | |
311 | ||
312 | if (WM97XX_GPIO_13 & pol & status) { | |
313 | wm->pen_is_down = 1; | |
314 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol & | |
315 | ~WM97XX_GPIO_13); | |
316 | } else { | |
317 | wm->pen_is_down = 0; | |
318 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, pol | | |
319 | WM97XX_GPIO_13); | |
320 | } | |
321 | ||
99fde513 | 322 | if (wm->id == WM9712_ID2 && wm->variant != WM97xx_WM1613) |
febf1dff MB |
323 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, (status & |
324 | ~WM97XX_GPIO_13) << 1); | |
325 | else | |
326 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, status & | |
327 | ~WM97XX_GPIO_13); | |
328 | mutex_unlock(&wm->codec_mutex); | |
329 | } | |
330 | ||
331 | /* If the system is not using continuous mode or it provides a | |
332 | * pen down operation then we need to schedule polls while the | |
333 | * pen is down. Otherwise the machine driver is responsible | |
334 | * for scheduling reads. | |
335 | */ | |
336 | if (!wm->mach_ops->acc_enabled || wm->mach_ops->acc_pen_down) { | |
337 | if (wm->pen_is_down && !pen_was_down) { | |
25985edc | 338 | /* Data is not available immediately on pen down */ |
febf1dff MB |
339 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, 1); |
340 | } | |
341 | ||
342 | /* Let ts_reader report the pen up for debounce. */ | |
343 | if (!wm->pen_is_down && pen_was_down) | |
344 | wm->pen_is_down = 1; | |
345 | } | |
346 | ||
347 | if (!wm->pen_is_down && wm->mach_ops->acc_enabled) | |
348 | wm->mach_ops->acc_pen_up(wm); | |
349 | ||
350 | wm->mach_ops->irq_enable(wm, 1); | |
351 | } | |
352 | ||
353 | /* | |
354 | * Codec PENDOWN irq handler | |
355 | * | |
356 | * We have to disable the codec interrupt in the handler because it | |
25985edc | 357 | * can take up to 1ms to clear the interrupt source. We schedule a task |
d808fbe5 MB |
358 | * in a work queue to do the actual interaction with the chip. The |
359 | * interrupt is then enabled again in the slow handler when the source | |
360 | * has been cleared. | |
febf1dff MB |
361 | */ |
362 | static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) | |
363 | { | |
364 | struct wm97xx *wm = dev_id; | |
365 | ||
d808fbe5 MB |
366 | if (!work_pending(&wm->pen_event_work)) { |
367 | wm->mach_ops->irq_enable(wm, 0); | |
368 | queue_work(wm->ts_workq, &wm->pen_event_work); | |
369 | } | |
febf1dff MB |
370 | |
371 | return IRQ_HANDLED; | |
372 | } | |
373 | ||
374 | /* | |
375 | * initialise pen IRQ handler and workqueue | |
376 | */ | |
377 | static int wm97xx_init_pen_irq(struct wm97xx *wm) | |
378 | { | |
379 | u16 reg; | |
380 | ||
381 | /* If an interrupt is supplied an IRQ enable operation must also be | |
382 | * provided. */ | |
383 | BUG_ON(!wm->mach_ops->irq_enable); | |
384 | ||
4f295232 | 385 | if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED, |
febf1dff MB |
386 | "wm97xx-pen", wm)) { |
387 | dev_err(wm->dev, | |
388 | "Failed to register pen down interrupt, polling"); | |
389 | wm->pen_irq = 0; | |
390 | return -EINVAL; | |
391 | } | |
392 | ||
393 | /* Configure GPIO as interrupt source on WM971x */ | |
394 | if (wm->id != WM9705_ID2) { | |
395 | BUG_ON(!wm->mach_ops->irq_gpio); | |
396 | reg = wm97xx_reg_read(wm, AC97_MISC_AFE); | |
397 | wm97xx_reg_write(wm, AC97_MISC_AFE, | |
398 | reg & ~(wm->mach_ops->irq_gpio)); | |
399 | reg = wm97xx_reg_read(wm, 0x5a); | |
400 | wm97xx_reg_write(wm, 0x5a, reg & ~0x0001); | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static int wm97xx_read_samples(struct wm97xx *wm) | |
407 | { | |
408 | struct wm97xx_data data; | |
409 | int rc; | |
410 | ||
411 | mutex_lock(&wm->codec_mutex); | |
412 | ||
413 | if (wm->mach_ops && wm->mach_ops->acc_enabled) | |
414 | rc = wm->mach_ops->acc_pen_down(wm); | |
415 | else | |
416 | rc = wm->codec->poll_touch(wm, &data); | |
417 | ||
418 | if (rc & RC_PENUP) { | |
419 | if (wm->pen_is_down) { | |
420 | wm->pen_is_down = 0; | |
421 | dev_dbg(wm->dev, "pen up\n"); | |
422 | input_report_abs(wm->input_dev, ABS_PRESSURE, 0); | |
65db86ac | 423 | input_report_key(wm->input_dev, BTN_TOUCH, 0); |
febf1dff MB |
424 | input_sync(wm->input_dev); |
425 | } else if (!(rc & RC_AGAIN)) { | |
426 | /* We need high frequency updates only while | |
427 | * pen is down, the user never will be able to | |
428 | * touch screen faster than a few times per | |
429 | * second... On the other hand, when the user | |
430 | * is actively working with the touchscreen we | |
431 | * don't want to lose the quick response. So we | |
432 | * will slowly increase sleep time after the | |
433 | * pen is up and quicky restore it to ~one task | |
434 | * switch when pen is down again. | |
435 | */ | |
436 | if (wm->ts_reader_interval < HZ / 10) | |
437 | wm->ts_reader_interval++; | |
438 | } | |
439 | ||
440 | } else if (rc & RC_VALID) { | |
441 | dev_dbg(wm->dev, | |
442 | "pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n", | |
443 | data.x >> 12, data.x & 0xfff, data.y >> 12, | |
444 | data.y & 0xfff, data.p >> 12, data.p & 0xfff); | |
445 | input_report_abs(wm->input_dev, ABS_X, data.x & 0xfff); | |
446 | input_report_abs(wm->input_dev, ABS_Y, data.y & 0xfff); | |
447 | input_report_abs(wm->input_dev, ABS_PRESSURE, data.p & 0xfff); | |
65db86ac | 448 | input_report_key(wm->input_dev, BTN_TOUCH, 1); |
febf1dff MB |
449 | input_sync(wm->input_dev); |
450 | wm->pen_is_down = 1; | |
451 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
452 | } else if (rc & RC_PENDOWN) { | |
453 | dev_dbg(wm->dev, "pen down\n"); | |
454 | wm->pen_is_down = 1; | |
455 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
456 | } | |
457 | ||
458 | mutex_unlock(&wm->codec_mutex); | |
459 | return rc; | |
460 | } | |
461 | ||
462 | /* | |
463 | * The touchscreen sample reader. | |
464 | */ | |
465 | static void wm97xx_ts_reader(struct work_struct *work) | |
466 | { | |
467 | int rc; | |
468 | struct wm97xx *wm = container_of(work, struct wm97xx, ts_reader.work); | |
469 | ||
470 | BUG_ON(!wm->codec); | |
471 | ||
472 | do { | |
473 | rc = wm97xx_read_samples(wm); | |
474 | } while (rc & RC_AGAIN); | |
475 | ||
476 | if (wm->pen_is_down || !wm->pen_irq) | |
477 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, | |
478 | wm->ts_reader_interval); | |
479 | } | |
480 | ||
481 | /** | |
482 | * wm97xx_ts_input_open - Open the touch screen input device. | |
483 | * @idev: Input device to be opened. | |
484 | * | |
485 | * Called by the input sub system to open a wm97xx touchscreen device. | |
486 | * Starts the touchscreen thread and touch digitiser. | |
487 | */ | |
488 | static int wm97xx_ts_input_open(struct input_dev *idev) | |
489 | { | |
490 | struct wm97xx *wm = input_get_drvdata(idev); | |
491 | ||
492 | wm->ts_workq = create_singlethread_workqueue("kwm97xx"); | |
493 | if (wm->ts_workq == NULL) { | |
494 | dev_err(wm->dev, | |
495 | "Failed to create workqueue\n"); | |
496 | return -EINVAL; | |
497 | } | |
498 | ||
499 | /* start digitiser */ | |
500 | if (wm->mach_ops && wm->mach_ops->acc_enabled) | |
501 | wm->codec->acc_enable(wm, 1); | |
502 | wm->codec->dig_enable(wm, 1); | |
503 | ||
504 | INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader); | |
505 | INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker); | |
506 | ||
507 | wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1; | |
508 | if (wm->ts_reader_min_interval < 1) | |
509 | wm->ts_reader_min_interval = 1; | |
510 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
511 | ||
512 | wm->pen_is_down = 0; | |
513 | if (wm->pen_irq) | |
514 | wm97xx_init_pen_irq(wm); | |
515 | else | |
516 | dev_err(wm->dev, "No IRQ specified\n"); | |
517 | ||
518 | /* If we either don't have an interrupt for pen down events or | |
519 | * failed to acquire it then we need to poll. | |
520 | */ | |
521 | if (wm->pen_irq == 0) | |
522 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, | |
523 | wm->ts_reader_interval); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * wm97xx_ts_input_close - Close the touch screen input device. | |
530 | * @idev: Input device to be closed. | |
531 | * | |
532 | * Called by the input sub system to close a wm97xx touchscreen | |
533 | * device. Kills the touchscreen thread and stops the touch | |
534 | * digitiser. | |
535 | */ | |
536 | ||
537 | static void wm97xx_ts_input_close(struct input_dev *idev) | |
538 | { | |
539 | struct wm97xx *wm = input_get_drvdata(idev); | |
540 | u16 reg; | |
541 | ||
542 | if (wm->pen_irq) { | |
543 | /* Return the interrupt to GPIO usage (disabling it) */ | |
544 | if (wm->id != WM9705_ID2) { | |
545 | BUG_ON(!wm->mach_ops->irq_gpio); | |
546 | reg = wm97xx_reg_read(wm, AC97_MISC_AFE); | |
547 | wm97xx_reg_write(wm, AC97_MISC_AFE, | |
548 | reg | wm->mach_ops->irq_gpio); | |
549 | } | |
550 | ||
551 | free_irq(wm->pen_irq, wm); | |
552 | } | |
553 | ||
554 | wm->pen_is_down = 0; | |
555 | ||
556 | /* Balance out interrupt disables/enables */ | |
557 | if (cancel_work_sync(&wm->pen_event_work)) | |
558 | wm->mach_ops->irq_enable(wm, 1); | |
559 | ||
560 | /* ts_reader rearms itself so we need to explicitly stop it | |
561 | * before we destroy the workqueue. | |
562 | */ | |
563 | cancel_delayed_work_sync(&wm->ts_reader); | |
564 | ||
565 | destroy_workqueue(wm->ts_workq); | |
566 | ||
567 | /* stop digitiser */ | |
568 | wm->codec->dig_enable(wm, 0); | |
569 | if (wm->mach_ops && wm->mach_ops->acc_enabled) | |
570 | wm->codec->acc_enable(wm, 0); | |
571 | } | |
572 | ||
573 | static int wm97xx_probe(struct device *dev) | |
574 | { | |
575 | struct wm97xx *wm; | |
32bb0e0c | 576 | struct wm97xx_pdata *pdata = dev->platform_data; |
febf1dff MB |
577 | int ret = 0, id = 0; |
578 | ||
579 | wm = kzalloc(sizeof(struct wm97xx), GFP_KERNEL); | |
580 | if (!wm) | |
581 | return -ENOMEM; | |
582 | mutex_init(&wm->codec_mutex); | |
583 | ||
584 | wm->dev = dev; | |
017596b6 | 585 | dev_set_drvdata(dev, wm); |
febf1dff MB |
586 | wm->ac97 = to_ac97_t(dev); |
587 | ||
588 | /* check that we have a supported codec */ | |
589 | id = wm97xx_reg_read(wm, AC97_VENDOR_ID1); | |
590 | if (id != WM97XX_ID1) { | |
591 | dev_err(dev, "Device with vendor %04x is not a wm97xx\n", id); | |
592 | ret = -ENODEV; | |
593 | goto alloc_err; | |
594 | } | |
595 | ||
596 | wm->id = wm97xx_reg_read(wm, AC97_VENDOR_ID2); | |
597 | ||
99fde513 MV |
598 | wm->variant = WM97xx_GENERIC; |
599 | ||
febf1dff MB |
600 | dev_info(wm->dev, "detected a wm97%02x codec\n", wm->id & 0xff); |
601 | ||
602 | switch (wm->id & 0xff) { | |
603 | #ifdef CONFIG_TOUCHSCREEN_WM9705 | |
604 | case 0x05: | |
605 | wm->codec = &wm9705_codec; | |
606 | break; | |
607 | #endif | |
608 | #ifdef CONFIG_TOUCHSCREEN_WM9712 | |
609 | case 0x12: | |
610 | wm->codec = &wm9712_codec; | |
611 | break; | |
612 | #endif | |
613 | #ifdef CONFIG_TOUCHSCREEN_WM9713 | |
614 | case 0x13: | |
615 | wm->codec = &wm9713_codec; | |
616 | break; | |
617 | #endif | |
618 | default: | |
619 | dev_err(wm->dev, "Support for wm97%02x not compiled in.\n", | |
620 | wm->id & 0xff); | |
621 | ret = -ENODEV; | |
622 | goto alloc_err; | |
623 | } | |
624 | ||
5de4cd43 MB |
625 | /* set up physical characteristics */ |
626 | wm->codec->phy_init(wm); | |
627 | ||
628 | /* load gpio cache */ | |
629 | wm->gpio[0] = wm97xx_reg_read(wm, AC97_GPIO_CFG); | |
630 | wm->gpio[1] = wm97xx_reg_read(wm, AC97_GPIO_POLARITY); | |
631 | wm->gpio[2] = wm97xx_reg_read(wm, AC97_GPIO_STICKY); | |
632 | wm->gpio[3] = wm97xx_reg_read(wm, AC97_GPIO_WAKEUP); | |
633 | wm->gpio[4] = wm97xx_reg_read(wm, AC97_GPIO_STATUS); | |
634 | wm->gpio[5] = wm97xx_reg_read(wm, AC97_MISC_AFE); | |
635 | ||
febf1dff MB |
636 | wm->input_dev = input_allocate_device(); |
637 | if (wm->input_dev == NULL) { | |
638 | ret = -ENOMEM; | |
639 | goto alloc_err; | |
640 | } | |
641 | ||
642 | /* set up touch configuration */ | |
643 | wm->input_dev->name = "wm97xx touchscreen"; | |
6b32ca39 | 644 | wm->input_dev->phys = "wm97xx"; |
febf1dff MB |
645 | wm->input_dev->open = wm97xx_ts_input_open; |
646 | wm->input_dev->close = wm97xx_ts_input_close; | |
65db86ac MR |
647 | |
648 | __set_bit(EV_ABS, wm->input_dev->evbit); | |
649 | __set_bit(EV_KEY, wm->input_dev->evbit); | |
650 | __set_bit(BTN_TOUCH, wm->input_dev->keybit); | |
651 | ||
febf1dff MB |
652 | input_set_abs_params(wm->input_dev, ABS_X, abs_x[0], abs_x[1], |
653 | abs_x[2], 0); | |
654 | input_set_abs_params(wm->input_dev, ABS_Y, abs_y[0], abs_y[1], | |
655 | abs_y[2], 0); | |
656 | input_set_abs_params(wm->input_dev, ABS_PRESSURE, abs_p[0], abs_p[1], | |
657 | abs_p[2], 0); | |
65db86ac | 658 | |
febf1dff MB |
659 | input_set_drvdata(wm->input_dev, wm); |
660 | wm->input_dev->dev.parent = dev; | |
65db86ac | 661 | |
febf1dff MB |
662 | ret = input_register_device(wm->input_dev); |
663 | if (ret < 0) | |
664 | goto dev_alloc_err; | |
665 | ||
febf1dff MB |
666 | /* register our battery device */ |
667 | wm->battery_dev = platform_device_alloc("wm97xx-battery", -1); | |
668 | if (!wm->battery_dev) { | |
669 | ret = -ENOMEM; | |
670 | goto batt_err; | |
671 | } | |
672 | platform_set_drvdata(wm->battery_dev, wm); | |
673 | wm->battery_dev->dev.parent = dev; | |
32bb0e0c | 674 | wm->battery_dev->dev.platform_data = pdata; |
febf1dff MB |
675 | ret = platform_device_add(wm->battery_dev); |
676 | if (ret < 0) | |
677 | goto batt_reg_err; | |
678 | ||
679 | /* register our extended touch device (for machine specific | |
680 | * extensions) */ | |
681 | wm->touch_dev = platform_device_alloc("wm97xx-touch", -1); | |
682 | if (!wm->touch_dev) { | |
683 | ret = -ENOMEM; | |
684 | goto touch_err; | |
685 | } | |
686 | platform_set_drvdata(wm->touch_dev, wm); | |
687 | wm->touch_dev->dev.parent = dev; | |
32bb0e0c | 688 | wm->touch_dev->dev.platform_data = pdata; |
febf1dff MB |
689 | ret = platform_device_add(wm->touch_dev); |
690 | if (ret < 0) | |
691 | goto touch_reg_err; | |
692 | ||
693 | return ret; | |
694 | ||
695 | touch_reg_err: | |
696 | platform_device_put(wm->touch_dev); | |
697 | touch_err: | |
d3622e6f | 698 | platform_device_del(wm->battery_dev); |
febf1dff MB |
699 | batt_reg_err: |
700 | platform_device_put(wm->battery_dev); | |
701 | batt_err: | |
702 | input_unregister_device(wm->input_dev); | |
703 | wm->input_dev = NULL; | |
704 | dev_alloc_err: | |
705 | input_free_device(wm->input_dev); | |
706 | alloc_err: | |
707 | kfree(wm); | |
708 | ||
709 | return ret; | |
710 | } | |
711 | ||
712 | static int wm97xx_remove(struct device *dev) | |
713 | { | |
714 | struct wm97xx *wm = dev_get_drvdata(dev); | |
715 | ||
716 | platform_device_unregister(wm->battery_dev); | |
717 | platform_device_unregister(wm->touch_dev); | |
718 | input_unregister_device(wm->input_dev); | |
719 | kfree(wm); | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
724 | #ifdef CONFIG_PM | |
725 | static int wm97xx_suspend(struct device *dev, pm_message_t state) | |
726 | { | |
727 | struct wm97xx *wm = dev_get_drvdata(dev); | |
34d27853 MB |
728 | u16 reg; |
729 | int suspend_mode; | |
730 | ||
731 | if (device_may_wakeup(&wm->input_dev->dev)) | |
732 | suspend_mode = wm->suspend_mode; | |
733 | else | |
734 | suspend_mode = 0; | |
febf1dff MB |
735 | |
736 | if (wm->input_dev->users) | |
737 | cancel_delayed_work_sync(&wm->ts_reader); | |
738 | ||
34d27853 MB |
739 | /* Power down the digitiser (bypassing the cache for resume) */ |
740 | reg = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER2); | |
741 | reg &= ~WM97XX_PRP_DET_DIG; | |
742 | if (wm->input_dev->users) | |
743 | reg |= suspend_mode; | |
744 | wm->ac97->bus->ops->write(wm->ac97, AC97_WM97XX_DIGITISER2, reg); | |
745 | ||
746 | /* WM9713 has an additional power bit - turn it off if there | |
747 | * are no users or if suspend mode is zero. */ | |
748 | if (wm->id == WM9713_ID2 && | |
749 | (!wm->input_dev->users || !suspend_mode)) { | |
750 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) | 0x8000; | |
751 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); | |
752 | } | |
753 | ||
febf1dff MB |
754 | return 0; |
755 | } | |
756 | ||
757 | static int wm97xx_resume(struct device *dev) | |
758 | { | |
759 | struct wm97xx *wm = dev_get_drvdata(dev); | |
760 | ||
761 | /* restore digitiser and gpios */ | |
762 | if (wm->id == WM9713_ID2) { | |
763 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig[0]); | |
764 | wm97xx_reg_write(wm, 0x5a, wm->misc); | |
765 | if (wm->input_dev->users) { | |
766 | u16 reg; | |
767 | reg = wm97xx_reg_read(wm, AC97_EXTENDED_MID) & 0x7fff; | |
768 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, reg); | |
769 | } | |
770 | } | |
771 | ||
772 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig[1]); | |
773 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2]); | |
774 | ||
775 | wm97xx_reg_write(wm, AC97_GPIO_CFG, wm->gpio[0]); | |
776 | wm97xx_reg_write(wm, AC97_GPIO_POLARITY, wm->gpio[1]); | |
777 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, wm->gpio[2]); | |
778 | wm97xx_reg_write(wm, AC97_GPIO_WAKEUP, wm->gpio[3]); | |
779 | wm97xx_reg_write(wm, AC97_GPIO_STATUS, wm->gpio[4]); | |
780 | wm97xx_reg_write(wm, AC97_MISC_AFE, wm->gpio[5]); | |
781 | ||
782 | if (wm->input_dev->users && !wm->pen_irq) { | |
783 | wm->ts_reader_interval = wm->ts_reader_min_interval; | |
784 | queue_delayed_work(wm->ts_workq, &wm->ts_reader, | |
785 | wm->ts_reader_interval); | |
786 | } | |
787 | ||
788 | return 0; | |
789 | } | |
790 | ||
791 | #else | |
792 | #define wm97xx_suspend NULL | |
793 | #define wm97xx_resume NULL | |
794 | #endif | |
795 | ||
796 | /* | |
797 | * Machine specific operations | |
798 | */ | |
799 | int wm97xx_register_mach_ops(struct wm97xx *wm, | |
800 | struct wm97xx_mach_ops *mach_ops) | |
801 | { | |
802 | mutex_lock(&wm->codec_mutex); | |
803 | if (wm->mach_ops) { | |
804 | mutex_unlock(&wm->codec_mutex); | |
805 | return -EINVAL; | |
806 | } | |
807 | wm->mach_ops = mach_ops; | |
808 | mutex_unlock(&wm->codec_mutex); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(wm97xx_register_mach_ops); | |
813 | ||
814 | void wm97xx_unregister_mach_ops(struct wm97xx *wm) | |
815 | { | |
816 | mutex_lock(&wm->codec_mutex); | |
817 | wm->mach_ops = NULL; | |
818 | mutex_unlock(&wm->codec_mutex); | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(wm97xx_unregister_mach_ops); | |
821 | ||
822 | static struct device_driver wm97xx_driver = { | |
ef9db492 | 823 | .name = "wm97xx-ts", |
febf1dff MB |
824 | .bus = &ac97_bus_type, |
825 | .owner = THIS_MODULE, | |
826 | .probe = wm97xx_probe, | |
827 | .remove = wm97xx_remove, | |
828 | .suspend = wm97xx_suspend, | |
829 | .resume = wm97xx_resume, | |
830 | }; | |
831 | ||
832 | static int __init wm97xx_init(void) | |
833 | { | |
834 | return driver_register(&wm97xx_driver); | |
835 | } | |
836 | ||
837 | static void __exit wm97xx_exit(void) | |
838 | { | |
839 | driver_unregister(&wm97xx_driver); | |
840 | } | |
841 | ||
842 | module_init(wm97xx_init); | |
843 | module_exit(wm97xx_exit); | |
844 | ||
845 | /* Module information */ | |
b8d055a8 | 846 | MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); |
febf1dff MB |
847 | MODULE_DESCRIPTION("WM97xx Core - Touch Screen / AUX ADC / GPIO Driver"); |
848 | MODULE_LICENSE("GPL"); |