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1 | /* |
2 | * wm9713.c -- Codec touch driver for Wolfson WM9713 AC97 Codec. | |
3 | * | |
4 | * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC. | |
b8d055a8 | 5 | * Author: Liam Girdwood <lrg@slimlogic.co.uk> |
dca98e91 MB |
6 | * Parts Copyright : Ian Molton <spyro@f2s.com> |
7 | * Andrew Zabolotny <zap@homelink.ru> | |
8 | * Russell King <rmk@arm.linux.org.uk> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation; either version 2 of the License, or (at your | |
13 | * option) any later version. | |
14 | * | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/moduleparam.h> | |
dca98e91 MB |
19 | #include <linux/kernel.h> |
20 | #include <linux/input.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/bitops.h> | |
23 | #include <linux/wm97xx.h> | |
24 | ||
25 | #define TS_NAME "wm97xx" | |
26 | #define WM9713_VERSION "1.00" | |
27 | #define DEFAULT_PRESSURE 0xb0c0 | |
28 | ||
29 | /* | |
30 | * Module parameters | |
31 | */ | |
32 | ||
33 | /* | |
34 | * Set internal pull up for pen detect. | |
35 | * | |
36 | * Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive) | |
37 | * i.e. pull up resistance = 64k Ohms / rpu. | |
38 | * | |
39 | * Adjust this value if you are having problems with pen detect not | |
40 | * detecting any down event. | |
41 | */ | |
42 | static int rpu = 8; | |
43 | module_param(rpu, int, 0); | |
44 | MODULE_PARM_DESC(rpu, "Set internal pull up resitor for pen detect."); | |
45 | ||
46 | /* | |
47 | * Set current used for pressure measurement. | |
48 | * | |
49 | * Set pil = 2 to use 400uA | |
50 | * pil = 1 to use 200uA and | |
51 | * pil = 0 to disable pressure measurement. | |
52 | * | |
53 | * This is used to increase the range of values returned by the adc | |
54 | * when measureing touchpanel pressure. | |
55 | */ | |
56 | static int pil; | |
57 | module_param(pil, int, 0); | |
58 | MODULE_PARM_DESC(pil, "Set current used for pressure measurement."); | |
59 | ||
60 | /* | |
61 | * Set threshold for pressure measurement. | |
62 | * | |
63 | * Pen down pressure below threshold is ignored. | |
64 | */ | |
65 | static int pressure = DEFAULT_PRESSURE & 0xfff; | |
66 | module_param(pressure, int, 0); | |
67 | MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement."); | |
68 | ||
69 | /* | |
70 | * Set adc sample delay. | |
71 | * | |
72 | * For accurate touchpanel measurements, some settling time may be | |
73 | * required between the switch matrix applying a voltage across the | |
74 | * touchpanel plate and the ADC sampling the signal. | |
75 | * | |
76 | * This delay can be set by setting delay = n, where n is the array | |
77 | * position of the delay in the array delay_table below. | |
78 | * Long delays > 1ms are supported for completeness, but are not | |
79 | * recommended. | |
80 | */ | |
81 | static int delay = 4; | |
82 | module_param(delay, int, 0); | |
83 | MODULE_PARM_DESC(delay, "Set adc sample delay."); | |
84 | ||
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85 | /* |
86 | * Set five_wire = 1 to use a 5 wire touchscreen. | |
87 | * | |
88 | * NOTE: Five wire mode does not allow for readback of pressure. | |
89 | */ | |
90 | static int five_wire; | |
91 | module_param(five_wire, int, 0); | |
92 | MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen."); | |
93 | ||
dca98e91 MB |
94 | /* |
95 | * Set adc mask function. | |
96 | * | |
97 | * Sources of glitch noise, such as signals driving an LCD display, may feed | |
98 | * through to the touch screen plates and affect measurement accuracy. In | |
99 | * order to minimise this, a signal may be applied to the MASK pin to delay or | |
100 | * synchronise the sampling. | |
101 | * | |
102 | * 0 = No delay or sync | |
103 | * 1 = High on pin stops conversions | |
104 | * 2 = Edge triggered, edge on pin delays conversion by delay param (above) | |
105 | * 3 = Edge triggered, edge on pin starts conversion after delay param | |
106 | */ | |
107 | static int mask; | |
108 | module_param(mask, int, 0); | |
109 | MODULE_PARM_DESC(mask, "Set adc mask function."); | |
110 | ||
111 | /* | |
112 | * Coordinate Polling Enable. | |
113 | * | |
114 | * Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together | |
115 | * for every poll. | |
116 | */ | |
117 | static int coord; | |
118 | module_param(coord, int, 0); | |
119 | MODULE_PARM_DESC(coord, "Polling coordinate mode"); | |
120 | ||
121 | /* | |
122 | * ADC sample delay times in uS | |
123 | */ | |
124 | static const int delay_table[] = { | |
125 | 21, /* 1 AC97 Link frames */ | |
126 | 42, /* 2 */ | |
127 | 84, /* 4 */ | |
128 | 167, /* 8 */ | |
129 | 333, /* 16 */ | |
130 | 667, /* 32 */ | |
131 | 1000, /* 48 */ | |
132 | 1333, /* 64 */ | |
133 | 2000, /* 96 */ | |
134 | 2667, /* 128 */ | |
135 | 3333, /* 160 */ | |
136 | 4000, /* 192 */ | |
137 | 4667, /* 224 */ | |
138 | 5333, /* 256 */ | |
139 | 6000, /* 288 */ | |
140 | 0 /* No delay, switch matrix always on */ | |
141 | }; | |
142 | ||
143 | /* | |
144 | * Delay after issuing a POLL command. | |
145 | * | |
146 | * The delay is 3 AC97 link frames + the touchpanel settling delay | |
147 | */ | |
148 | static inline void poll_delay(int d) | |
149 | { | |
150 | udelay(3 * AC97_LINK_FRAME + delay_table[d]); | |
151 | } | |
152 | ||
153 | /* | |
154 | * set up the physical settings of the WM9713 | |
155 | */ | |
156 | static void wm9713_phy_init(struct wm97xx *wm) | |
157 | { | |
158 | u16 dig1 = 0, dig2, dig3; | |
159 | ||
160 | /* default values */ | |
161 | dig2 = WM97XX_DELAY(4) | WM97XX_SLT(5); | |
162 | dig3 = WM9712_RPU(1); | |
163 | ||
164 | /* rpu */ | |
165 | if (rpu) { | |
166 | dig3 &= 0xffc0; | |
167 | dig3 |= WM9712_RPU(rpu); | |
168 | dev_info(wm->dev, "setting pen detect pull-up to %d Ohms\n", | |
169 | 64000 / rpu); | |
170 | } | |
171 | ||
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172 | /* Five wire panel? */ |
173 | if (five_wire) { | |
174 | dig3 |= WM9713_45W; | |
175 | dev_info(wm->dev, "setting 5-wire touchscreen mode."); | |
176 | ||
177 | if (pil) { | |
178 | dev_warn(wm->dev, | |
179 | "Pressure measurement not supported in 5 " | |
180 | "wire mode, disabling\n"); | |
181 | pil = 0; | |
182 | } | |
183 | } | |
184 | ||
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185 | /* touchpanel pressure */ |
186 | if (pil == 2) { | |
187 | dig3 |= WM9712_PIL; | |
188 | dev_info(wm->dev, | |
189 | "setting pressure measurement current to 400uA."); | |
190 | } else if (pil) | |
191 | dev_info(wm->dev, | |
192 | "setting pressure measurement current to 200uA."); | |
193 | if (!pil) | |
194 | pressure = 0; | |
195 | ||
196 | /* sample settling delay */ | |
197 | if (delay < 0 || delay > 15) { | |
198 | dev_info(wm->dev, "supplied delay out of range."); | |
199 | delay = 4; | |
200 | dev_info(wm->dev, "setting adc sample delay to %d u Secs.", | |
201 | delay_table[delay]); | |
202 | } | |
203 | dig2 &= 0xff0f; | |
204 | dig2 |= WM97XX_DELAY(delay); | |
205 | ||
206 | /* mask */ | |
207 | dig3 |= ((mask & 0x3) << 4); | |
208 | if (coord) | |
209 | dig3 |= WM9713_WAIT; | |
210 | ||
211 | wm->misc = wm97xx_reg_read(wm, 0x5a); | |
212 | ||
213 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1); | |
214 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2); | |
215 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3); | |
216 | wm97xx_reg_write(wm, AC97_GPIO_STICKY, 0x0); | |
217 | } | |
218 | ||
219 | static void wm9713_dig_enable(struct wm97xx *wm, int enable) | |
220 | { | |
221 | u16 val; | |
222 | ||
223 | if (enable) { | |
224 | val = wm97xx_reg_read(wm, AC97_EXTENDED_MID); | |
225 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, val & 0x7fff); | |
226 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] | | |
227 | WM97XX_PRP_DET_DIG); | |
228 | wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */ | |
229 | } else { | |
230 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] & | |
231 | ~WM97XX_PRP_DET_DIG); | |
232 | val = wm97xx_reg_read(wm, AC97_EXTENDED_MID); | |
233 | wm97xx_reg_write(wm, AC97_EXTENDED_MID, val | 0x8000); | |
234 | } | |
235 | } | |
236 | ||
237 | static void wm9713_dig_restore(struct wm97xx *wm) | |
238 | { | |
239 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig_save[0]); | |
240 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig_save[1]); | |
241 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig_save[2]); | |
242 | } | |
243 | ||
244 | static void wm9713_aux_prepare(struct wm97xx *wm) | |
245 | { | |
246 | memcpy(wm->dig_save, wm->dig, sizeof(wm->dig)); | |
247 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, 0); | |
248 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, 0); | |
249 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, WM97XX_PRP_DET_DIG); | |
250 | } | |
251 | ||
252 | static inline int is_pden(struct wm97xx *wm) | |
253 | { | |
254 | return wm->dig[2] & WM9713_PDEN; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Read a sample from the WM9713 adc in polling mode. | |
259 | */ | |
260 | static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample) | |
261 | { | |
262 | u16 dig1; | |
263 | int timeout = 5 * delay; | |
264 | ||
265 | if (!wm->pen_probably_down) { | |
266 | u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); | |
267 | if (!(data & WM97XX_PEN_DOWN)) | |
268 | return RC_PENUP; | |
269 | wm->pen_probably_down = 1; | |
270 | } | |
271 | ||
272 | /* set up digitiser */ | |
273 | if (adcsel & 0x8000) | |
274 | adcsel = 1 << ((adcsel & 0x7fff) + 3); | |
275 | ||
276 | dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1); | |
277 | dig1 &= ~WM9713_ADCSEL_MASK; | |
278 | ||
279 | if (wm->mach_ops && wm->mach_ops->pre_sample) | |
280 | wm->mach_ops->pre_sample(adcsel); | |
281 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | adcsel | WM9713_POLL); | |
282 | ||
283 | /* wait 3 AC97 time slots + delay for conversion */ | |
284 | poll_delay(delay); | |
285 | ||
286 | /* wait for POLL to go low */ | |
287 | while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) && | |
288 | timeout) { | |
289 | udelay(AC97_LINK_FRAME); | |
290 | timeout--; | |
291 | } | |
292 | ||
293 | if (timeout <= 0) { | |
294 | /* If PDEN is set, we can get a timeout when pen goes up */ | |
295 | if (is_pden(wm)) | |
296 | wm->pen_probably_down = 0; | |
297 | else | |
298 | dev_dbg(wm->dev, "adc sample timeout"); | |
299 | return RC_PENUP; | |
300 | } | |
301 | ||
302 | *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); | |
303 | if (wm->mach_ops && wm->mach_ops->post_sample) | |
304 | wm->mach_ops->post_sample(adcsel); | |
305 | ||
306 | /* check we have correct sample */ | |
307 | if ((*sample & WM97XX_ADCSRC_MASK) != ffs(adcsel >> 1) << 12) { | |
308 | dev_dbg(wm->dev, "adc wrong sample, read %x got %x", adcsel, | |
309 | *sample & WM97XX_ADCSRC_MASK); | |
310 | return RC_PENUP; | |
311 | } | |
312 | ||
313 | if (!(*sample & WM97XX_PEN_DOWN)) { | |
314 | wm->pen_probably_down = 0; | |
315 | return RC_PENUP; | |
316 | } | |
317 | ||
318 | return RC_VALID; | |
319 | } | |
320 | ||
321 | /* | |
322 | * Read a coordinate from the WM9713 adc in polling mode. | |
323 | */ | |
324 | static int wm9713_poll_coord(struct wm97xx *wm, struct wm97xx_data *data) | |
325 | { | |
326 | u16 dig1; | |
327 | int timeout = 5 * delay; | |
328 | ||
329 | if (!wm->pen_probably_down) { | |
330 | u16 val = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); | |
331 | if (!(val & WM97XX_PEN_DOWN)) | |
332 | return RC_PENUP; | |
333 | wm->pen_probably_down = 1; | |
334 | } | |
335 | ||
336 | /* set up digitiser */ | |
337 | dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1); | |
338 | dig1 &= ~WM9713_ADCSEL_MASK; | |
339 | if (pil) | |
340 | dig1 |= WM9713_ADCSEL_PRES; | |
341 | ||
342 | if (wm->mach_ops && wm->mach_ops->pre_sample) | |
343 | wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y); | |
344 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, | |
345 | dig1 | WM9713_POLL | WM9713_COO); | |
346 | ||
347 | /* wait 3 AC97 time slots + delay for conversion */ | |
348 | poll_delay(delay); | |
349 | data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); | |
350 | /* wait for POLL to go low */ | |
351 | while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) | |
352 | && timeout) { | |
353 | udelay(AC97_LINK_FRAME); | |
354 | timeout--; | |
355 | } | |
356 | ||
357 | if (timeout <= 0) { | |
358 | /* If PDEN is set, we can get a timeout when pen goes up */ | |
359 | if (is_pden(wm)) | |
360 | wm->pen_probably_down = 0; | |
361 | else | |
362 | dev_dbg(wm->dev, "adc sample timeout"); | |
363 | return RC_PENUP; | |
364 | } | |
365 | ||
366 | /* read back data */ | |
367 | data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); | |
368 | if (pil) | |
369 | data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); | |
370 | else | |
371 | data->p = DEFAULT_PRESSURE; | |
372 | ||
373 | if (wm->mach_ops && wm->mach_ops->post_sample) | |
374 | wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y); | |
375 | ||
376 | /* check we have correct sample */ | |
377 | if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y)) | |
378 | goto err; | |
379 | if (pil && !(data->p & WM97XX_ADCSEL_PRES)) | |
380 | goto err; | |
381 | ||
382 | if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) { | |
383 | wm->pen_probably_down = 0; | |
384 | return RC_PENUP; | |
385 | } | |
386 | return RC_VALID; | |
387 | err: | |
388 | return 0; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Sample the WM9713 touchscreen in polling mode | |
393 | */ | |
394 | static int wm9713_poll_touch(struct wm97xx *wm, struct wm97xx_data *data) | |
395 | { | |
396 | int rc; | |
397 | ||
398 | if (coord) { | |
399 | rc = wm9713_poll_coord(wm, data); | |
400 | if (rc != RC_VALID) | |
401 | return rc; | |
402 | } else { | |
403 | rc = wm9713_poll_sample(wm, WM9713_ADCSEL_X, &data->x); | |
404 | if (rc != RC_VALID) | |
405 | return rc; | |
406 | rc = wm9713_poll_sample(wm, WM9713_ADCSEL_Y, &data->y); | |
407 | if (rc != RC_VALID) | |
408 | return rc; | |
409 | if (pil) { | |
410 | rc = wm9713_poll_sample(wm, WM9713_ADCSEL_PRES, | |
411 | &data->p); | |
412 | if (rc != RC_VALID) | |
413 | return rc; | |
414 | } else | |
415 | data->p = DEFAULT_PRESSURE; | |
416 | } | |
417 | return RC_VALID; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Enable WM9713 continuous mode, i.e. touch data is streamed across | |
422 | * an AC97 slot | |
423 | */ | |
424 | static int wm9713_acc_enable(struct wm97xx *wm, int enable) | |
425 | { | |
426 | u16 dig1, dig2, dig3; | |
427 | int ret = 0; | |
428 | ||
429 | dig1 = wm->dig[0]; | |
430 | dig2 = wm->dig[1]; | |
431 | dig3 = wm->dig[2]; | |
432 | ||
433 | if (enable) { | |
25985edc | 434 | /* continuous mode */ |
dca98e91 MB |
435 | if (wm->mach_ops->acc_startup && |
436 | (ret = wm->mach_ops->acc_startup(wm)) < 0) | |
437 | return ret; | |
438 | ||
439 | dig1 &= ~WM9713_ADCSEL_MASK; | |
440 | dig1 |= WM9713_CTC | WM9713_COO | WM9713_ADCSEL_X | | |
441 | WM9713_ADCSEL_Y; | |
442 | if (pil) | |
443 | dig1 |= WM9713_ADCSEL_PRES; | |
444 | dig2 &= ~(WM97XX_DELAY_MASK | WM97XX_SLT_MASK | | |
445 | WM97XX_CM_RATE_MASK); | |
446 | dig2 |= WM97XX_SLEN | WM97XX_DELAY(delay) | | |
447 | WM97XX_SLT(wm->acc_slot) | WM97XX_RATE(wm->acc_rate); | |
448 | dig3 |= WM9713_PDEN; | |
449 | } else { | |
450 | dig1 &= ~(WM9713_CTC | WM9713_COO); | |
451 | dig2 &= ~WM97XX_SLEN; | |
452 | dig3 &= ~WM9713_PDEN; | |
453 | if (wm->mach_ops->acc_shutdown) | |
454 | wm->mach_ops->acc_shutdown(wm); | |
455 | } | |
456 | ||
457 | wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1); | |
458 | wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2); | |
459 | wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3); | |
460 | ||
461 | return ret; | |
462 | } | |
463 | ||
464 | struct wm97xx_codec_drv wm9713_codec = { | |
465 | .id = WM9713_ID2, | |
466 | .name = "wm9713", | |
467 | .poll_sample = wm9713_poll_sample, | |
468 | .poll_touch = wm9713_poll_touch, | |
469 | .acc_enable = wm9713_acc_enable, | |
470 | .phy_init = wm9713_phy_init, | |
471 | .dig_enable = wm9713_dig_enable, | |
472 | .dig_restore = wm9713_dig_restore, | |
473 | .aux_prepare = wm9713_aux_prepare, | |
474 | }; | |
475 | EXPORT_SYMBOL_GPL(wm9713_codec); | |
476 | ||
477 | /* Module information */ | |
b8d055a8 | 478 | MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>"); |
dca98e91 MB |
479 | MODULE_DESCRIPTION("WM9713 Touch Screen Driver"); |
480 | MODULE_LICENSE("GPL"); |