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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * wm9713.c -- Codec touch driver for Wolfson WM9713 AC97 Codec.
4 *
5 * Copyright 2003, 2004, 2005, 2006, 2007, 2008 Wolfson Microelectronics PLC.
6 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
7 * Parts Copyright : Ian Molton <spyro@f2s.com>
8 * Andrew Zabolotny <zap@homelink.ru>
9 * Russell King <rmk@arm.linux.org.uk>
10 */
11
12#include <linux/module.h>
13#include <linux/moduleparam.h>
14#include <linux/kernel.h>
15#include <linux/input.h>
16#include <linux/delay.h>
17#include <linux/bitops.h>
18#include <linux/wm97xx.h>
19
20#define TS_NAME "wm97xx"
21#define WM9713_VERSION "1.00"
22#define DEFAULT_PRESSURE 0xb0c0
23
24/*
25 * Module parameters
26 */
27
28/*
29 * Set internal pull up for pen detect.
30 *
31 * Pull up is in the range 1.02k (least sensitive) to 64k (most sensitive)
32 * i.e. pull up resistance = 64k Ohms / rpu.
33 *
34 * Adjust this value if you are having problems with pen detect not
35 * detecting any down event.
36 */
37static int rpu = 8;
38module_param(rpu, int, 0);
39MODULE_PARM_DESC(rpu, "Set internal pull up resistor for pen detect.");
40
41/*
42 * Set current used for pressure measurement.
43 *
44 * Set pil = 2 to use 400uA
45 * pil = 1 to use 200uA and
46 * pil = 0 to disable pressure measurement.
47 *
48 * This is used to increase the range of values returned by the adc
49 * when measureing touchpanel pressure.
50 */
51static int pil;
52module_param(pil, int, 0);
53MODULE_PARM_DESC(pil, "Set current used for pressure measurement.");
54
55/*
56 * Set threshold for pressure measurement.
57 *
58 * Pen down pressure below threshold is ignored.
59 */
60static int pressure = DEFAULT_PRESSURE & 0xfff;
61module_param(pressure, int, 0);
62MODULE_PARM_DESC(pressure, "Set threshold for pressure measurement.");
63
64/*
65 * Set adc sample delay.
66 *
67 * For accurate touchpanel measurements, some settling time may be
68 * required between the switch matrix applying a voltage across the
69 * touchpanel plate and the ADC sampling the signal.
70 *
71 * This delay can be set by setting delay = n, where n is the array
72 * position of the delay in the array delay_table below.
73 * Long delays > 1ms are supported for completeness, but are not
74 * recommended.
75 */
76static int delay = 4;
77module_param(delay, int, 0);
78MODULE_PARM_DESC(delay, "Set adc sample delay.");
79
80/*
81 * Set five_wire = 1 to use a 5 wire touchscreen.
82 *
83 * NOTE: Five wire mode does not allow for readback of pressure.
84 */
85static int five_wire;
86module_param(five_wire, int, 0);
87MODULE_PARM_DESC(five_wire, "Set to '1' to use 5-wire touchscreen.");
88
89/*
90 * Set adc mask function.
91 *
92 * Sources of glitch noise, such as signals driving an LCD display, may feed
93 * through to the touch screen plates and affect measurement accuracy. In
94 * order to minimise this, a signal may be applied to the MASK pin to delay or
95 * synchronise the sampling.
96 *
97 * 0 = No delay or sync
98 * 1 = High on pin stops conversions
99 * 2 = Edge triggered, edge on pin delays conversion by delay param (above)
100 * 3 = Edge triggered, edge on pin starts conversion after delay param
101 */
102static int mask;
103module_param(mask, int, 0);
104MODULE_PARM_DESC(mask, "Set adc mask function.");
105
106/*
107 * Coordinate Polling Enable.
108 *
109 * Set to 1 to enable coordinate polling. e.g. x,y[,p] is sampled together
110 * for every poll.
111 */
112static int coord;
113module_param(coord, int, 0);
114MODULE_PARM_DESC(coord, "Polling coordinate mode");
115
116/*
117 * ADC sample delay times in uS
118 */
119static const int delay_table[] = {
120 21, /* 1 AC97 Link frames */
121 42, /* 2 */
122 84, /* 4 */
123 167, /* 8 */
124 333, /* 16 */
125 667, /* 32 */
126 1000, /* 48 */
127 1333, /* 64 */
128 2000, /* 96 */
129 2667, /* 128 */
130 3333, /* 160 */
131 4000, /* 192 */
132 4667, /* 224 */
133 5333, /* 256 */
134 6000, /* 288 */
135 0 /* No delay, switch matrix always on */
136};
137
138/*
139 * Delay after issuing a POLL command.
140 *
141 * The delay is 3 AC97 link frames + the touchpanel settling delay
142 */
143static inline void poll_delay(int d)
144{
145 udelay(3 * AC97_LINK_FRAME + delay_table[d]);
146}
147
148/*
149 * set up the physical settings of the WM9713
150 */
151static void wm9713_phy_init(struct wm97xx *wm)
152{
153 u16 dig1 = 0, dig2, dig3;
154
155 /* default values */
156 dig2 = WM97XX_DELAY(4) | WM97XX_SLT(5);
157 dig3 = WM9712_RPU(1);
158
159 /* rpu */
160 if (rpu) {
161 dig3 &= 0xffc0;
162 dig3 |= WM9712_RPU(rpu);
163 dev_info(wm->dev, "setting pen detect pull-up to %d Ohms\n",
164 64000 / rpu);
165 }
166
167 /* Five wire panel? */
168 if (five_wire) {
169 dig3 |= WM9713_45W;
170 dev_info(wm->dev, "setting 5-wire touchscreen mode.");
171
172 if (pil) {
173 dev_warn(wm->dev,
174 "Pressure measurement not supported in 5 "
175 "wire mode, disabling\n");
176 pil = 0;
177 }
178 }
179
180 /* touchpanel pressure */
181 if (pil == 2) {
182 dig3 |= WM9712_PIL;
183 dev_info(wm->dev,
184 "setting pressure measurement current to 400uA.");
185 } else if (pil)
186 dev_info(wm->dev,
187 "setting pressure measurement current to 200uA.");
188 if (!pil)
189 pressure = 0;
190
191 /* sample settling delay */
192 if (delay < 0 || delay > 15) {
193 dev_info(wm->dev, "supplied delay out of range.");
194 delay = 4;
195 dev_info(wm->dev, "setting adc sample delay to %d u Secs.",
196 delay_table[delay]);
197 }
198 dig2 &= 0xff0f;
199 dig2 |= WM97XX_DELAY(delay);
200
201 /* mask */
202 dig3 |= ((mask & 0x3) << 4);
203 if (coord)
204 dig3 |= WM9713_WAIT;
205
206 wm->misc = wm97xx_reg_read(wm, 0x5a);
207
208 wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
209 wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
210 wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
211 wm97xx_reg_write(wm, AC97_GPIO_STICKY, 0x0);
212}
213
214static void wm9713_dig_enable(struct wm97xx *wm, int enable)
215{
216 u16 val;
217
218 if (enable) {
219 val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
220 wm97xx_reg_write(wm, AC97_EXTENDED_MID, val & 0x7fff);
221 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] |
222 WM97XX_PRP_DET_DIG);
223 wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD); /* dummy read */
224 } else {
225 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig[2] &
226 ~WM97XX_PRP_DET_DIG);
227 val = wm97xx_reg_read(wm, AC97_EXTENDED_MID);
228 wm97xx_reg_write(wm, AC97_EXTENDED_MID, val | 0x8000);
229 }
230}
231
232static void wm9713_dig_restore(struct wm97xx *wm)
233{
234 wm97xx_reg_write(wm, AC97_WM9713_DIG1, wm->dig_save[0]);
235 wm97xx_reg_write(wm, AC97_WM9713_DIG2, wm->dig_save[1]);
236 wm97xx_reg_write(wm, AC97_WM9713_DIG3, wm->dig_save[2]);
237}
238
239static void wm9713_aux_prepare(struct wm97xx *wm)
240{
241 memcpy(wm->dig_save, wm->dig, sizeof(wm->dig));
242 wm97xx_reg_write(wm, AC97_WM9713_DIG1, 0);
243 wm97xx_reg_write(wm, AC97_WM9713_DIG2, 0);
244 wm97xx_reg_write(wm, AC97_WM9713_DIG3, WM97XX_PRP_DET_DIG);
245}
246
247static inline int is_pden(struct wm97xx *wm)
248{
249 return wm->dig[2] & WM9713_PDEN;
250}
251
252/*
253 * Read a sample from the WM9713 adc in polling mode.
254 */
255static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
256{
257 u16 dig1;
258 int timeout = 5 * delay;
259 bool wants_pen = adcsel & WM97XX_PEN_DOWN;
260
261 if (wants_pen && !wm->pen_probably_down) {
262 u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
263 if (!(data & WM97XX_PEN_DOWN))
264 return RC_PENUP;
265 wm->pen_probably_down = 1;
266 }
267
268 /* set up digitiser */
269 dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
270 dig1 &= ~WM9713_ADCSEL_MASK;
271 /* WM97XX_ADCSEL_* channels need to be converted to WM9713 format */
272 dig1 |= 1 << ((adcsel & WM97XX_ADCSEL_MASK) >> 12);
273
274 if (wm->mach_ops && wm->mach_ops->pre_sample)
275 wm->mach_ops->pre_sample(adcsel);
276 wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | WM9713_POLL);
277
278 /* wait 3 AC97 time slots + delay for conversion */
279 poll_delay(delay);
280
281 /* wait for POLL to go low */
282 while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL) &&
283 timeout) {
284 udelay(AC97_LINK_FRAME);
285 timeout--;
286 }
287
288 if (timeout <= 0) {
289 /* If PDEN is set, we can get a timeout when pen goes up */
290 if (is_pden(wm))
291 wm->pen_probably_down = 0;
292 else
293 dev_dbg(wm->dev, "adc sample timeout");
294 return RC_PENUP;
295 }
296
297 *sample = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
298 if (wm->mach_ops && wm->mach_ops->post_sample)
299 wm->mach_ops->post_sample(adcsel);
300
301 /* check we have correct sample */
302 if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
303 dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
304 adcsel & WM97XX_ADCSEL_MASK,
305 *sample & WM97XX_ADCSEL_MASK);
306 return RC_PENUP;
307 }
308
309 if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
310 wm->pen_probably_down = 0;
311 return RC_PENUP;
312 }
313
314 return RC_VALID;
315}
316
317/*
318 * Read a coordinate from the WM9713 adc in polling mode.
319 */
320static int wm9713_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
321{
322 u16 dig1;
323 int timeout = 5 * delay;
324
325 if (!wm->pen_probably_down) {
326 u16 val = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
327 if (!(val & WM97XX_PEN_DOWN))
328 return RC_PENUP;
329 wm->pen_probably_down = 1;
330 }
331
332 /* set up digitiser */
333 dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
334 dig1 &= ~WM9713_ADCSEL_MASK;
335 if (pil)
336 dig1 |= WM9713_ADCSEL_PRES;
337
338 if (wm->mach_ops && wm->mach_ops->pre_sample)
339 wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
340 wm97xx_reg_write(wm, AC97_WM9713_DIG1,
341 dig1 | WM9713_POLL | WM9713_COO);
342
343 /* wait 3 AC97 time slots + delay for conversion */
344 poll_delay(delay);
345 data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
346 /* wait for POLL to go low */
347 while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL)
348 && timeout) {
349 udelay(AC97_LINK_FRAME);
350 timeout--;
351 }
352
353 if (timeout <= 0) {
354 /* If PDEN is set, we can get a timeout when pen goes up */
355 if (is_pden(wm))
356 wm->pen_probably_down = 0;
357 else
358 dev_dbg(wm->dev, "adc sample timeout");
359 return RC_PENUP;
360 }
361
362 /* read back data */
363 data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
364 if (pil)
365 data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
366 else
367 data->p = DEFAULT_PRESSURE;
368
369 if (wm->mach_ops && wm->mach_ops->post_sample)
370 wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
371
372 /* check we have correct sample */
373 if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
374 goto err;
375 if (pil && !(data->p & WM97XX_ADCSEL_PRES))
376 goto err;
377
378 if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {
379 wm->pen_probably_down = 0;
380 return RC_PENUP;
381 }
382 return RC_VALID;
383err:
384 return 0;
385}
386
387/*
388 * Sample the WM9713 touchscreen in polling mode
389 */
390static int wm9713_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
391{
392 int rc;
393
394 if (coord) {
395 rc = wm9713_poll_coord(wm, data);
396 if (rc != RC_VALID)
397 return rc;
398 } else {
399 rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);
400 if (rc != RC_VALID)
401 return rc;
402 rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);
403 if (rc != RC_VALID)
404 return rc;
405 if (pil) {
406 rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
407 &data->p);
408 if (rc != RC_VALID)
409 return rc;
410 } else
411 data->p = DEFAULT_PRESSURE;
412 }
413 return RC_VALID;
414}
415
416/*
417 * Enable WM9713 continuous mode, i.e. touch data is streamed across
418 * an AC97 slot
419 */
420static int wm9713_acc_enable(struct wm97xx *wm, int enable)
421{
422 u16 dig1, dig2, dig3;
423 int ret = 0;
424
425 dig1 = wm->dig[0];
426 dig2 = wm->dig[1];
427 dig3 = wm->dig[2];
428
429 if (enable) {
430 /* continuous mode */
431 if (wm->mach_ops->acc_startup &&
432 (ret = wm->mach_ops->acc_startup(wm)) < 0)
433 return ret;
434
435 dig1 &= ~WM9713_ADCSEL_MASK;
436 dig1 |= WM9713_CTC | WM9713_COO | WM9713_ADCSEL_X |
437 WM9713_ADCSEL_Y;
438 if (pil)
439 dig1 |= WM9713_ADCSEL_PRES;
440 dig2 &= ~(WM97XX_DELAY_MASK | WM97XX_SLT_MASK |
441 WM97XX_CM_RATE_MASK);
442 dig2 |= WM97XX_SLEN | WM97XX_DELAY(delay) |
443 WM97XX_SLT(wm->acc_slot) | WM97XX_RATE(wm->acc_rate);
444 dig3 |= WM9713_PDEN;
445 } else {
446 dig1 &= ~(WM9713_CTC | WM9713_COO);
447 dig2 &= ~WM97XX_SLEN;
448 dig3 &= ~WM9713_PDEN;
449 if (wm->mach_ops->acc_shutdown)
450 wm->mach_ops->acc_shutdown(wm);
451 }
452
453 wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
454 wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
455 wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
456
457 return ret;
458}
459
460struct wm97xx_codec_drv wm9713_codec = {
461 .id = WM9713_ID2,
462 .name = "wm9713",
463 .poll_sample = wm9713_poll_sample,
464 .poll_touch = wm9713_poll_touch,
465 .acc_enable = wm9713_acc_enable,
466 .phy_init = wm9713_phy_init,
467 .dig_enable = wm9713_dig_enable,
468 .dig_restore = wm9713_dig_restore,
469 .aux_prepare = wm9713_aux_prepare,
470};
471EXPORT_SYMBOL_GPL(wm9713_codec);
472
473/* Module information */
474MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
475MODULE_DESCRIPTION("WM9713 Touch Screen Driver");
476MODULE_LICENSE("GPL");
1/*
2 * wm9713.c -- Codec touch driver for Wolfson WM9713 AC97 Codec.
3 *
4 * Copyright 2003, 2004, 2005, 2006, 2007, 2008 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 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 */
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 = 4;
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 WM9713
155 */
156static 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
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
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
219static 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
237static 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
244static 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
252static 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 */
260static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
261{
262 u16 dig1;
263 int timeout = 5 * delay;
264 bool wants_pen = adcsel & WM97XX_PEN_DOWN;
265
266 if (wants_pen && !wm->pen_probably_down) {
267 u16 data = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
268 if (!(data & WM97XX_PEN_DOWN))
269 return RC_PENUP;
270 wm->pen_probably_down = 1;
271 }
272
273 /* set up digitiser */
274 dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
275 dig1 &= ~WM9713_ADCSEL_MASK;
276 /* WM97XX_ADCSEL_* channels need to be converted to WM9713 format */
277 dig1 |= 1 << ((adcsel & WM97XX_ADCSEL_MASK) >> 12);
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 | 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 ^ adcsel) & WM97XX_ADCSEL_MASK) {
308 dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
309 adcsel & WM97XX_ADCSEL_MASK,
310 *sample & WM97XX_ADCSEL_MASK);
311 return RC_PENUP;
312 }
313
314 if (wants_pen && !(*sample & WM97XX_PEN_DOWN)) {
315 wm->pen_probably_down = 0;
316 return RC_PENUP;
317 }
318
319 return RC_VALID;
320}
321
322/*
323 * Read a coordinate from the WM9713 adc in polling mode.
324 */
325static int wm9713_poll_coord(struct wm97xx *wm, struct wm97xx_data *data)
326{
327 u16 dig1;
328 int timeout = 5 * delay;
329
330 if (!wm->pen_probably_down) {
331 u16 val = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
332 if (!(val & WM97XX_PEN_DOWN))
333 return RC_PENUP;
334 wm->pen_probably_down = 1;
335 }
336
337 /* set up digitiser */
338 dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
339 dig1 &= ~WM9713_ADCSEL_MASK;
340 if (pil)
341 dig1 |= WM9713_ADCSEL_PRES;
342
343 if (wm->mach_ops && wm->mach_ops->pre_sample)
344 wm->mach_ops->pre_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
345 wm97xx_reg_write(wm, AC97_WM9713_DIG1,
346 dig1 | WM9713_POLL | WM9713_COO);
347
348 /* wait 3 AC97 time slots + delay for conversion */
349 poll_delay(delay);
350 data->x = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
351 /* wait for POLL to go low */
352 while ((wm97xx_reg_read(wm, AC97_WM9713_DIG1) & WM9713_POLL)
353 && timeout) {
354 udelay(AC97_LINK_FRAME);
355 timeout--;
356 }
357
358 if (timeout <= 0) {
359 /* If PDEN is set, we can get a timeout when pen goes up */
360 if (is_pden(wm))
361 wm->pen_probably_down = 0;
362 else
363 dev_dbg(wm->dev, "adc sample timeout");
364 return RC_PENUP;
365 }
366
367 /* read back data */
368 data->y = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
369 if (pil)
370 data->p = wm97xx_reg_read(wm, AC97_WM97XX_DIGITISER_RD);
371 else
372 data->p = DEFAULT_PRESSURE;
373
374 if (wm->mach_ops && wm->mach_ops->post_sample)
375 wm->mach_ops->post_sample(WM97XX_ADCSEL_X | WM97XX_ADCSEL_Y);
376
377 /* check we have correct sample */
378 if (!(data->x & WM97XX_ADCSEL_X) || !(data->y & WM97XX_ADCSEL_Y))
379 goto err;
380 if (pil && !(data->p & WM97XX_ADCSEL_PRES))
381 goto err;
382
383 if (!(data->x & WM97XX_PEN_DOWN) || !(data->y & WM97XX_PEN_DOWN)) {
384 wm->pen_probably_down = 0;
385 return RC_PENUP;
386 }
387 return RC_VALID;
388err:
389 return 0;
390}
391
392/*
393 * Sample the WM9713 touchscreen in polling mode
394 */
395static int wm9713_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
396{
397 int rc;
398
399 if (coord) {
400 rc = wm9713_poll_coord(wm, data);
401 if (rc != RC_VALID)
402 return rc;
403 } else {
404 rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_X | WM97XX_PEN_DOWN, &data->x);
405 if (rc != RC_VALID)
406 return rc;
407 rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_Y | WM97XX_PEN_DOWN, &data->y);
408 if (rc != RC_VALID)
409 return rc;
410 if (pil) {
411 rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_PRES | WM97XX_PEN_DOWN,
412 &data->p);
413 if (rc != RC_VALID)
414 return rc;
415 } else
416 data->p = DEFAULT_PRESSURE;
417 }
418 return RC_VALID;
419}
420
421/*
422 * Enable WM9713 continuous mode, i.e. touch data is streamed across
423 * an AC97 slot
424 */
425static int wm9713_acc_enable(struct wm97xx *wm, int enable)
426{
427 u16 dig1, dig2, dig3;
428 int ret = 0;
429
430 dig1 = wm->dig[0];
431 dig2 = wm->dig[1];
432 dig3 = wm->dig[2];
433
434 if (enable) {
435 /* continuous mode */
436 if (wm->mach_ops->acc_startup &&
437 (ret = wm->mach_ops->acc_startup(wm)) < 0)
438 return ret;
439
440 dig1 &= ~WM9713_ADCSEL_MASK;
441 dig1 |= WM9713_CTC | WM9713_COO | WM9713_ADCSEL_X |
442 WM9713_ADCSEL_Y;
443 if (pil)
444 dig1 |= WM9713_ADCSEL_PRES;
445 dig2 &= ~(WM97XX_DELAY_MASK | WM97XX_SLT_MASK |
446 WM97XX_CM_RATE_MASK);
447 dig2 |= WM97XX_SLEN | WM97XX_DELAY(delay) |
448 WM97XX_SLT(wm->acc_slot) | WM97XX_RATE(wm->acc_rate);
449 dig3 |= WM9713_PDEN;
450 } else {
451 dig1 &= ~(WM9713_CTC | WM9713_COO);
452 dig2 &= ~WM97XX_SLEN;
453 dig3 &= ~WM9713_PDEN;
454 if (wm->mach_ops->acc_shutdown)
455 wm->mach_ops->acc_shutdown(wm);
456 }
457
458 wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1);
459 wm97xx_reg_write(wm, AC97_WM9713_DIG2, dig2);
460 wm97xx_reg_write(wm, AC97_WM9713_DIG3, dig3);
461
462 return ret;
463}
464
465struct wm97xx_codec_drv wm9713_codec = {
466 .id = WM9713_ID2,
467 .name = "wm9713",
468 .poll_sample = wm9713_poll_sample,
469 .poll_touch = wm9713_poll_touch,
470 .acc_enable = wm9713_acc_enable,
471 .phy_init = wm9713_phy_init,
472 .dig_enable = wm9713_dig_enable,
473 .dig_restore = wm9713_dig_restore,
474 .aux_prepare = wm9713_aux_prepare,
475};
476EXPORT_SYMBOL_GPL(wm9713_codec);
477
478/* Module information */
479MODULE_AUTHOR("Liam Girdwood <lrg@slimlogic.co.uk>");
480MODULE_DESCRIPTION("WM9713 Touch Screen Driver");
481MODULE_LICENSE("GPL");