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1/*
2 * wm9712.c -- Codec driver for Wolfson WM9712 AC97 Codecs.
3 *
4 * Copyright 2003, 2004, 2005, 2006, 2007 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
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>
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 WM9712_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 */
42static int rpu = 8;
43module_param(rpu, int, 0);
44MODULE_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 */
56static int pil;
57module_param(pil, int, 0);
58MODULE_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 */
65static int pressure = DEFAULT_PRESSURE & 0xfff;
66module_param(pressure, int, 0);
67MODULE_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 */
81static int delay = 3;
82module_param(delay, int, 0);
83MODULE_PARM_DESC(delay, "Set adc sample delay.");
84
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 */
90static int five_wire;
91module_param(five_wire, int, 0);
92MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
93
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 */
107static int mask;
108module_param(mask, int, 0);
109MODULE_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 */
117static int coord;
118module_param(coord, int, 0);
119MODULE_PARM_DESC(coord, "Polling coordinate mode");
120
121/*
122 * ADC sample delay times in uS
123 */
124static 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 */
148static 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 WM9712
155 */
156static void wm9712_phy_init(struct wm97xx *wm)
157{
158 u16 dig1 = 0;
159 u16 dig2 = WM97XX_RPR | WM9712_RPU(1);
160
161 /* WM9712 rpu */
162 if (rpu) {
163 dig2 &= 0xffc0;
164 dig2 |= WM9712_RPU(rpu);
165 dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms",
166 64000 / rpu);
167 }
168
169 /* WM9712 five wire */
170 if (five_wire) {
171 dig2 |= WM9712_45W;
172 dev_dbg(wm->dev, "setting 5-wire touchscreen mode.");
173
174 if (pil) {
175 dev_warn(wm->dev, "pressure measurement is not "
176 "supported in 5-wire mode\n");
177 pil = 0;
178 }
179 }
180
181 /* touchpanel pressure current*/
182 if (pil == 2) {
183 dig2 |= WM9712_PIL;
184 dev_dbg(wm->dev,
185 "setting pressure measurement current to 400uA.");
186 } else if (pil)
187 dev_dbg(wm->dev,
188 "setting pressure measurement current to 200uA.");
189 if (!pil)
190 pressure = 0;
191
192 /* polling mode sample settling delay */
193 if (delay < 0 || delay > 15) {
194 dev_dbg(wm->dev, "supplied delay out of range.");
195 delay = 4;
196 }
197 dig1 &= 0xff0f;
198 dig1 |= WM97XX_DELAY(delay);
199 dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.",
200 delay_table[delay]);
201
202 /* mask */
203 dig2 |= ((mask & 0x3) << 6);
204 if (mask) {
205 u16 reg;
206 /* Set GPIO4 as Mask Pin*/
207 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
208 wm97xx_reg_write(wm, AC97_MISC_AFE, reg | WM97XX_GPIO_4);
209 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
210 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg | WM97XX_GPIO_4);
211 }
212
213 /* wait - coord mode */
214 if (coord)
215 dig2 |= WM9712_WAIT;
216
217 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
218 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
219}
220
221static void wm9712_dig_enable(struct wm97xx *wm, int enable)
222{
223 u16 dig2 = wm->dig[2];
224
225 if (enable) {
226 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
227 dig2 | WM97XX_PRP_DET_DIG);
228 wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
229 } else
230 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
231 dig2 & ~WM97XX_PRP_DET_DIG);
232}
233
234static void wm9712_aux_prepare(struct wm97xx *wm)
235{
236 memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
237 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, 0);
238 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, WM97XX_PRP_DET_DIG);
239}
240
241static void wm9712_dig_restore(struct wm97xx *wm)
242{
243 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
244 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
245}
246
247static inline int is_pden(struct wm97xx *wm)
248{
249 return wm->dig[2] & WM9712_PDEN;
250}
251
252/*
253 * Read a sample from the WM9712 adc in polling mode.
254 */
255static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
256{
257 int timeout = 5 * delay;
258 bool wants_pen = adcsel & WM97XX_PEN_DOWN;
259
260 if (wants_pen && !wm->pen_probably_down) {
261 u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
262 if (!(data & WM97XX_PEN_DOWN))
263 return RC_PENUP;
264 wm->pen_probably_down = 1;
265 }
266
267 /* set up digitiser */
268 if (wm->mach_ops && wm->mach_ops->pre_sample)
269 wm->mach_ops->pre_sample(adcsel);
270 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, (adcsel & WM97XX_ADCSEL_MASK)
271 | WM97XX_POLL | WM97XX_DELAY(delay));
272
273 /* wait 3 AC97 time slots + delay for conversion */
274 poll_delay(delay);
275
276 /* wait for POLL to go low */
277 while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
278 && timeout) {
279 udelay(AC97_LINK_FRAME);
280 timeout--;
281 }
282
283 if (timeout <= 0) {
284 /* If PDEN is set, we can get a timeout when pen goes up */
285 if (is_pden(wm))
286 wm->pen_probably_down = 0;
287 else
288 dev_dbg(wm->dev, "adc sample timeout");
289 return RC_PENUP;
290 }
291
292 *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
293 if (wm->mach_ops && wm->mach_ops->post_sample)
294 wm->mach_ops->post_sample(adcsel);
295
296 /* check we have correct sample */
297 if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
298 dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
299 adcsel & WM97XX_ADCSEL_MASK,
300 *sample & WM97XX_ADCSEL_MASK);
301 return RC_PENUP;
302 }
303
304 if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
305 wm->pen_probably_down = 0;
306 return RC_PENUP;
307 }
308
309 return RC_VALID;
310}
311
312/*
313 * Read a coord from the WM9712 adc in polling mode.
314 */
315static int wm9712_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
316{
317 int timeout = 5 * delay;
318
319 if (!wm->pen_probably_down) {
320 u16 data_rd = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
321 if (!(data_rd & WM97XX_PEN_DOWN))
322 return RC_PENUP;
323 wm->pen_probably_down = 1;
324 }
325
326 /* set up digitiser */
327 if (wm->mach_ops && wm->mach_ops->pre_sample)
328 wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
329
330 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1,
331 WM97XX_COO | WM97XX_POLL | WM97XX_DELAY(delay));
332
333 /* wait 3 AC97 time slots + delay for conversion and read x */
334 poll_delay(delay);
335 data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
336 /* wait for POLL to go low */
337 while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
338 && timeout) {
339 udelay(AC97_LINK_FRAME);
340 timeout--;
341 }
342
343 if (timeout <= 0) {
344 /* If PDEN is set, we can get a timeout when pen goes up */
345 if (is_pden(wm))
346 wm->pen_probably_down = 0;
347 else
348 dev_dbg(wm->dev, "adc sample timeout");
349 return RC_PENUP;
350 }
351
352 /* read back y data */
353 data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
354 if (pil)
355 data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
356 else
357 data->p = DEFAULT_PRESSURE;
358
359 if (wm->mach_ops && wm->mach_ops->post_sample)
360 wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
361
362 /* check we have correct sample */
363 if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
364 goto err;
365 if (pil && !(data->p & WM97XX_ADCSEL_PRES))
366 goto err;
367
368 if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {
369 wm->pen_probably_down = 0;
370 return RC_PENUP;
371 }
372 return RC_VALID;
373err:
374 return 0;
375}
376
377/*
378 * Sample the WM9712 touchscreen in polling mode
379 */
380static int wm9712_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
381{
382 int rc;
383
384 if (coord) {
385 rc = wm9712_poll_coord(wm, data);
386 if (rc != RC_VALID)
387 return rc;
388 } else {
389 rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN,
390 &data->x);
391 if (rc != RC_VALID)
392 return rc;
393
394 rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN,
395 &data->y);
396 if (rc != RC_VALID)
397 return rc;
398
399 if (pil && !five_wire) {
400 rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
401 &data->p);
402 if (rc != RC_VALID)
403 return rc;
404 } else
405 data->p = DEFAULT_PRESSURE;
406 }
407 return RC_VALID;
408}
409
410/*
411 * Enable WM9712 continuous mode, i.e. touch data is streamed across
412 * an AC97 slot
413 */
414static int wm9712_acc_enable(struct wm97xx *wm, int enable)
415{
416 u16 dig1, dig2;
417 int ret = 0;
418
419 dig1 = wm->dig[1];
420 dig2 = wm->dig[2];
421
422 if (enable) {
423 /* continuous mode */
424 if (wm->mach_ops->acc_startup) {
425 ret = wm->mach_ops->acc_startup(wm);
426 if (ret < 0)
427 return ret;
428 }
429 dig1 &= ~(WM97XX_CM_RATE_MASK | WM97XX_ADCSEL_MASK |
430 WM97XX_DELAY_MASK | WM97XX_SLT_MASK);
431 dig1 |= WM97XX_CTC | WM97XX_COO | WM97XX_SLEN |
432 WM97XX_DELAY(delay) |
433 WM97XX_SLT(wm->acc_slot) |
434 WM97XX_RATE(wm->acc_rate);
435 if (pil)
436 dig1 |= WM97XX_ADCSEL_PRES;
437 dig2 |= WM9712_PDEN;
438 } else {
439 dig1 &= ~(WM97XX_CTC | WM97XX_COO | WM97XX_SLEN);
440 dig2 &= ~WM9712_PDEN;
441 if (wm->mach_ops->acc_shutdown)
442 wm->mach_ops->acc_shutdown(wm);
443 }
444
445 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
446 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
447
448 return 0;
449}
450
451struct wm97xx_codec_drv wm9712_codec = {
452 .id = WM9712_ID2,
453 .name = "wm9712",
454 .poll_sample = wm9712_poll_sample,
455 .poll_touch = wm9712_poll_touch,
456 .acc_enable = wm9712_acc_enable,
457 .phy_init = wm9712_phy_init,
458 .dig_enable = wm9712_dig_enable,
459 .dig_restore = wm9712_dig_restore,
460 .aux_prepare = wm9712_aux_prepare,
461};
462EXPORT_SYMBOL_GPL(wm9712_codec);
463
464/* Module information */
465MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
466MODULE_DESCRIPTION("WM9712 Touch Screen Driver");
467MODULE_LICENSE("GPL");
1/*
2 * wm9712.c -- Codec driver for Wolfson WM9712 AC97 Codecs.
3 *
4 * Copyright 2003, 2004, 2005, 2006, 2007 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
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>
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 WM9712_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 */
42static int rpu = 8;
43module_param(rpu, int, 0);
44MODULE_PARM_DESC(rpu, "Set internal pull up resistor 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 */
56static int pil;
57module_param(pil, int, 0);
58MODULE_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 */
65static int pressure = DEFAULT_PRESSURE & 0xfff;
66module_param(pressure, int, 0);
67MODULE_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 */
81static int delay = 3;
82module_param(delay, int, 0);
83MODULE_PARM_DESC(delay, "Set adc sample delay.");
84
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 */
90static int five_wire;
91module_param(five_wire, int, 0);
92MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
93
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 */
107static int mask;
108module_param(mask, int, 0);
109MODULE_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 */
117static int coord;
118module_param(coord, int, 0);
119MODULE_PARM_DESC(coord, "Polling coordinate mode");
120
121/*
122 * ADC sample delay times in uS
123 */
124static 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 */
148static 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 WM9712
155 */
156static void wm9712_phy_init(struct wm97xx *wm)
157{
158 u16 dig1 = 0;
159 u16 dig2 = WM97XX_RPR | WM9712_RPU(1);
160
161 /* WM9712 rpu */
162 if (rpu) {
163 dig2 &= 0xffc0;
164 dig2 |= WM9712_RPU(rpu);
165 dev_dbg(wm->dev, "setting pen detect pull-up to %d Ohms\n",
166 64000 / rpu);
167 }
168
169 /* WM9712 five wire */
170 if (five_wire) {
171 dig2 |= WM9712_45W;
172 dev_dbg(wm->dev, "setting 5-wire touchscreen mode.\n");
173
174 if (pil) {
175 dev_warn(wm->dev, "pressure measurement is not "
176 "supported in 5-wire mode\n");
177 pil = 0;
178 }
179 }
180
181 /* touchpanel pressure current*/
182 if (pil == 2) {
183 dig2 |= WM9712_PIL;
184 dev_dbg(wm->dev,
185 "setting pressure measurement current to 400uA.\n");
186 } else if (pil)
187 dev_dbg(wm->dev,
188 "setting pressure measurement current to 200uA.\n");
189 if (!pil)
190 pressure = 0;
191
192 /* polling mode sample settling delay */
193 if (delay < 0 || delay > 15) {
194 dev_dbg(wm->dev, "supplied delay out of range.\n");
195 delay = 4;
196 }
197 dig1 &= 0xff0f;
198 dig1 |= WM97XX_DELAY(delay);
199 dev_dbg(wm->dev, "setting adc sample delay to %d u Secs.\n",
200 delay_table[delay]);
201
202 /* mask */
203 dig2 |= ((mask & 0x3) << 6);
204 if (mask) {
205 u16 reg;
206 /* Set GPIO4 as Mask Pin*/
207 reg = wm97xx_reg_read(wm, AC97_MISC_AFE);
208 wm97xx_reg_write(wm, AC97_MISC_AFE, reg | WM97XX_GPIO_4);
209 reg = wm97xx_reg_read(wm, AC97_GPIO_CFG);
210 wm97xx_reg_write(wm, AC97_GPIO_CFG, reg | WM97XX_GPIO_4);
211 }
212
213 /* wait - coord mode */
214 if (coord)
215 dig2 |= WM9712_WAIT;
216
217 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
218 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
219}
220
221static void wm9712_dig_enable(struct wm97xx *wm, int enable)
222{
223 u16 dig2 = wm->dig[2];
224
225 if (enable) {
226 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
227 dig2 | WM97XX_PRP_DET_DIG);
228 wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
229 } else
230 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2,
231 dig2 & ~WM97XX_PRP_DET_DIG);
232}
233
234static void wm9712_aux_prepare(struct wm97xx *wm)
235{
236 memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
237 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, 0);
238 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, WM97XX_PRP_DET_DIG);
239}
240
241static void wm9712_dig_restore(struct wm97xx *wm)
242{
243 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, wm->dig_save[1]);
244 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, wm->dig_save[2]);
245}
246
247static inline int is_pden(struct wm97xx *wm)
248{
249 return wm->dig[2] & WM9712_PDEN;
250}
251
252/*
253 * Read a sample from the WM9712 adc in polling mode.
254 */
255static int wm9712_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
256{
257 int timeout = 5 * delay;
258 bool wants_pen = adcsel & WM97XX_PEN_DOWN;
259
260 if (wants_pen && !wm->pen_probably_down) {
261 u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
262 if (!(data & WM97XX_PEN_DOWN))
263 return RC_PENUP;
264 wm->pen_probably_down = 1;
265 }
266
267 /* set up digitiser */
268 if (wm->mach_ops && wm->mach_ops->pre_sample)
269 wm->mach_ops->pre_sample(adcsel);
270 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, (adcsel & WM97XX_ADCSEL_MASK)
271 | WM97XX_POLL | WM97XX_DELAY(delay));
272
273 /* wait 3 AC97 time slots + delay for conversion */
274 poll_delay(delay);
275
276 /* wait for POLL to go low */
277 while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
278 && timeout) {
279 udelay(AC97_LINK_FRAME);
280 timeout--;
281 }
282
283 if (timeout <= 0) {
284 /* If PDEN is set, we can get a timeout when pen goes up */
285 if (is_pden(wm))
286 wm->pen_probably_down = 0;
287 else
288 dev_dbg(wm->dev, "adc sample timeout\n");
289 return RC_PENUP;
290 }
291
292 *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
293 if (wm->mach_ops && wm->mach_ops->post_sample)
294 wm->mach_ops->post_sample(adcsel);
295
296 /* check we have correct sample */
297 if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
298 dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x\n",
299 adcsel & WM97XX_ADCSEL_MASK,
300 *sample & WM97XX_ADCSEL_MASK);
301 return RC_AGAIN;
302 }
303
304 if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
305 /* Sometimes it reads a wrong value the first time. */
306 *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
307 if (!(*sample & WM97XX_PEN_DOWN)) {
308 wm->pen_probably_down = 0;
309 return RC_PENUP;
310 }
311 }
312
313 return RC_VALID;
314}
315
316/*
317 * Read a coord from the WM9712 adc in polling mode.
318 */
319static int wm9712_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
320{
321 int timeout = 5 * delay;
322
323 if (!wm->pen_probably_down) {
324 u16 data_rd = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
325 if (!(data_rd & WM97XX_PEN_DOWN))
326 return RC_PENUP;
327 wm->pen_probably_down = 1;
328 }
329
330 /* set up digitiser */
331 if (wm->mach_ops && wm->mach_ops->pre_sample)
332 wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
333
334 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1,
335 WM97XX_COO | WM97XX_POLL | WM97XX_DELAY(delay));
336
337 /* wait 3 AC97 time slots + delay for conversion and read x */
338 poll_delay(delay);
339 data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
340 /* wait for POLL to go low */
341 while ((wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER1) & WM97XX_POLL)
342 && timeout) {
343 udelay(AC97_LINK_FRAME);
344 timeout--;
345 }
346
347 if (timeout <= 0) {
348 /* If PDEN is set, we can get a timeout when pen goes up */
349 if (is_pden(wm))
350 wm->pen_probably_down = 0;
351 else
352 dev_dbg(wm->dev, "adc sample timeout\n");
353 return RC_PENUP;
354 }
355
356 /* read back y data */
357 data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
358 if (pil)
359 data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
360 else
361 data->p = DEFAULT_PRESSURE;
362
363 if (wm->mach_ops && wm->mach_ops->post_sample)
364 wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
365
366 /* check we have correct sample */
367 if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
368 goto err;
369 if (pil && !(data->p & WM97XX_ADCSEL_PRES))
370 goto err;
371
372 if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {
373 wm->pen_probably_down = 0;
374 return RC_PENUP;
375 }
376 return RC_VALID;
377err:
378 return 0;
379}
380
381/*
382 * Sample the WM9712 touchscreen in polling mode
383 */
384static int wm9712_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
385{
386 int rc;
387
388 if (coord) {
389 rc = wm9712_poll_coord(wm, data);
390 if (rc != RC_VALID)
391 return rc;
392 } else {
393 rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN,
394 &data->x);
395 if (rc != RC_VALID)
396 return rc;
397
398 rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN,
399 &data->y);
400 if (rc != RC_VALID)
401 return rc;
402
403 if (pil && !five_wire) {
404 rc = wm9712_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
405 &data->p);
406 if (rc != RC_VALID)
407 return rc;
408 } else
409 data->p = DEFAULT_PRESSURE;
410 }
411 return RC_VALID;
412}
413
414/*
415 * Enable WM9712 continuous mode, i.e. touch data is streamed across
416 * an AC97 slot
417 */
418static int wm9712_acc_enable(struct wm97xx *wm, int enable)
419{
420 u16 dig1, dig2;
421 int ret = 0;
422
423 dig1 = wm->dig[1];
424 dig2 = wm->dig[2];
425
426 if (enable) {
427 /* continuous mode */
428 if (wm->mach_ops->acc_startup) {
429 ret = wm->mach_ops->acc_startup(wm);
430 if (ret < 0)
431 return ret;
432 }
433 dig1 &= ~(WM97XX_CM_RATE_MASK | WM97XX_ADCSEL_MASK |
434 WM97XX_DELAY_MASK | WM97XX_SLT_MASK);
435 dig1 |= WM97XX_CTC | WM97XX_COO | WM97XX_SLEN |
436 WM97XX_DELAY(delay) |
437 WM97XX_SLT(wm->acc_slot) |
438 WM97XX_RATE(wm->acc_rate);
439 if (pil)
440 dig1 |= WM97XX_ADCSEL_PRES;
441 dig2 |= WM9712_PDEN;
442 } else {
443 dig1 &= ~(WM97XX_CTC | WM97XX_COO | WM97XX_SLEN);
444 dig2 &= ~WM9712_PDEN;
445 if (wm->mach_ops->acc_shutdown)
446 wm->mach_ops->acc_shutdown(wm);
447 }
448
449 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER1, dig1);
450 wm97xx_reg_write(wm, AC97_WM97XX_DIGITISER2, dig2);
451
452 return 0;
453}
454
455struct wm97xx_codec_drv wm9712_codec = {
456 .id = WM9712_ID2,
457 .name = "wm9712",
458 .poll_sample = wm9712_poll_sample,
459 .poll_touch = wm9712_poll_touch,
460 .acc_enable = wm9712_acc_enable,
461 .phy_init = wm9712_phy_init,
462 .dig_enable = wm9712_dig_enable,
463 .dig_restore = wm9712_dig_restore,
464 .aux_prepare = wm9712_aux_prepare,
465};
466EXPORT_SYMBOL_GPL(wm9712_codec);
467
468/* Module information */
469MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
470MODULE_DESCRIPTION("WM9712 Touch Screen Driver");
471MODULE_LICENSE("GPL");