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Sreedhara DSa4cff8b2010-06-01 12:50:06 +01001/*
Dmitry Torokhov95b71272010-08-31 22:57:28 -07002 * Intel MID Resistive Touch Screen Driver
Sreedhara DSa4cff8b2010-06-01 12:50:06 +01003 *
4 * Copyright (C) 2008 Intel Corp
5 *
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
Dmitry Torokhov95b71272010-08-31 22:57:28 -070018 * with this program; if not, write to the Free Software Foundation, Inc.,
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010019 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20 *
21 * Questions/Comments/Bug fixes to Sreedhara (sreedhara.ds@intel.com)
Dmitry Torokhov95b71272010-08-31 22:57:28 -070022 * Ramesh Agarwal (ramesh.agarwal@intel.com)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010023 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 *
25 * TODO:
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010026 * review conversion of r/m/w sequences
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010027 */
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/input.h>
32#include <linux/interrupt.h>
33#include <linux/err.h>
34#include <linux/param.h>
Alek Du36466a12010-08-31 22:57:30 -070035#include <linux/slab.h>
36#include <linux/platform_device.h>
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010037#include <linux/irq.h>
38#include <linux/delay.h>
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010039#include <asm/intel_scu_ipc.h>
40
Dmitry Torokhov95b71272010-08-31 22:57:28 -070041/* PMIC Interrupt registers */
42#define PMIC_REG_ID1 0x00 /* PMIC ID1 register */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010043
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010044/* PMIC Interrupt registers */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070045#define PMIC_REG_INT 0x04 /* PMIC interrupt register */
46#define PMIC_REG_MINT 0x05 /* PMIC interrupt mask register */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010047
48/* ADC Interrupt registers */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070049#define PMIC_REG_ADCINT 0x5F /* ADC interrupt register */
50#define PMIC_REG_MADCINT 0x60 /* ADC interrupt mask register */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010051
52/* ADC Control registers */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070053#define PMIC_REG_ADCCNTL1 0x61 /* ADC control register */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010054
55/* ADC Channel Selection registers */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070056#define PMICADDR0 0xA4
57#define END_OF_CHANNEL 0x1F
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010058
59/* ADC Result register */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070060#define PMIC_REG_ADCSNS0H 0x64
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010061
62/* ADC channels for touch screen */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070063#define MRST_TS_CHAN10 0xA /* Touch screen X+ connection */
64#define MRST_TS_CHAN11 0xB /* Touch screen X- connection */
65#define MRST_TS_CHAN12 0xC /* Touch screen Y+ connection */
66#define MRST_TS_CHAN13 0xD /* Touch screen Y- connection */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010067
68/* Touch screen channel BIAS constants */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070069#define MRST_XBIAS 0x20
70#define MRST_YBIAS 0x40
71#define MRST_ZBIAS 0x80
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010072
73/* Touch screen coordinates */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070074#define MRST_X_MIN 10
75#define MRST_X_MAX 1024
76#define MRST_X_FUZZ 5
77#define MRST_Y_MIN 10
78#define MRST_Y_MAX 1024
79#define MRST_Y_FUZZ 5
80#define MRST_PRESSURE_MIN 0
81#define MRST_PRESSURE_NOMINAL 50
82#define MRST_PRESSURE_MAX 100
Alan Coxaff4c342010-08-31 22:20:55 -070083
Dmitry Torokhov95b71272010-08-31 22:57:28 -070084#define WAIT_ADC_COMPLETION 10 /* msec */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010085
86/* PMIC ADC round robin delays */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070087#define ADC_LOOP_DELAY0 0x0 /* Continuous loop */
88#define ADC_LOOP_DELAY1 0x1 /* 4.5 ms approximate */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010089
90/* PMIC Vendor Identifiers */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070091#define PMIC_VENDOR_FS 0 /* PMIC vendor FreeScale */
92#define PMIC_VENDOR_MAXIM 1 /* PMIC vendor MAXIM */
93#define PMIC_VENDOR_NEC 2 /* PMIC vendor NEC */
94#define MRSTOUCH_MAX_CHANNELS 32 /* Maximum ADC channels */
Sreedhara DSa4cff8b2010-06-01 12:50:06 +010095
96/* Touch screen device structure */
97struct mrstouch_dev {
Alek Du36466a12010-08-31 22:57:30 -070098 struct device *dev; /* device associated with touch screen */
Dmitry Torokhov95b71272010-08-31 22:57:28 -070099 struct input_dev *input;
100 char phys[32];
101 u16 asr; /* Address selection register */
102 int irq;
103 unsigned int vendor; /* PMIC vendor */
104 unsigned int rev; /* PMIC revision */
105
106 int (*read_prepare)(struct mrstouch_dev *tsdev);
107 int (*read)(struct mrstouch_dev *tsdev, u16 *x, u16 *y, u16 *z);
108 int (*read_finish)(struct mrstouch_dev *tsdev);
109};
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100110
111
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700112/*************************** NEC and Maxim Interface ************************/
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100113
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700114static int mrstouch_nec_adc_read_prepare(struct mrstouch_dev *tsdev)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100115{
Andy Rossa9cfa252010-08-31 23:00:41 -0700116 return intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0, 0x20);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100117}
118
119/*
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700120 * Enables PENDET interrupt.
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100121 */
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700122static int mrstouch_nec_adc_read_finish(struct mrstouch_dev *tsdev)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100123{
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100124 int err;
125
Andy Rossa9cfa252010-08-31 23:00:41 -0700126 err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x20, 0x20);
127 if (!err)
128 err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, 0, 0x05);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100129
Andy Rossa9cfa252010-08-31 23:00:41 -0700130 return err;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100131}
132
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700133/*
134 * Reads PMIC ADC touch screen result
135 * Reads ADC storage registers for higher 7 and lower 3 bits and
136 * converts the two readings into a single value and turns off gain bit
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100137 */
138static int mrstouch_ts_chan_read(u16 offset, u16 chan, u16 *vp, u16 *vm)
139{
140 int err;
141 u16 result;
142 u32 res;
143
144 result = PMIC_REG_ADCSNS0H + offset;
145
146 if (chan == MRST_TS_CHAN12)
147 result += 4;
148
149 err = intel_scu_ipc_ioread32(result, &res);
150 if (err)
151 return err;
152
153 /* Mash the bits up */
154
155 *vp = (res & 0xFF) << 3; /* Highest 7 bits */
156 *vp |= (res >> 8) & 0x07; /* Lower 3 bits */
157 *vp &= 0x3FF;
158
159 res >>= 16;
160
161 *vm = (res & 0xFF) << 3; /* Highest 7 bits */
162 *vm |= (res >> 8) & 0x07; /* Lower 3 bits */
163 *vm &= 0x3FF;
164
165 return 0;
166}
167
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700168/*
169 * Enables X, Y and Z bias values
170 * Enables YPYM for X channels and XPXM for Y channels
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100171 */
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700172static int mrstouch_ts_bias_set(uint offset, uint bias)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100173{
174 int count;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700175 u16 chan, start;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100176 u16 reg[4];
177 u8 data[4];
178
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700179 chan = PMICADDR0 + offset;
180 start = MRST_TS_CHAN10;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100181
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700182 for (count = 0; count <= 3; count++) {
183 reg[count] = chan++;
184 data[count] = bias | (start + count);
185 }
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100186
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700187 return intel_scu_ipc_writev(reg, data, 4);
188}
189
190/* To read touch screen channel values */
191static int mrstouch_nec_adc_read(struct mrstouch_dev *tsdev,
192 u16 *x, u16 *y, u16 *z)
193{
194 int err;
195 u16 xm, ym, zm;
196
197 /* configure Y bias for X channels */
198 err = mrstouch_ts_bias_set(tsdev->asr, MRST_YBIAS);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100199 if (err)
200 goto ipc_error;
201
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700202 msleep(WAIT_ADC_COMPLETION);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100203
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700204 /* read x+ and x- channels */
205 err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, x, &xm);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100206 if (err)
207 goto ipc_error;
208
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700209 /* configure x bias for y channels */
210 err = mrstouch_ts_bias_set(tsdev->asr, MRST_XBIAS);
211 if (err)
212 goto ipc_error;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100213
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700214 msleep(WAIT_ADC_COMPLETION);
215
216 /* read y+ and y- channels */
217 err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN12, y, &ym);
218 if (err)
219 goto ipc_error;
220
221 /* configure z bias for x and y channels */
222 err = mrstouch_ts_bias_set(tsdev->asr, MRST_ZBIAS);
223 if (err)
224 goto ipc_error;
225
226 msleep(WAIT_ADC_COMPLETION);
227
228 /* read z+ and z- channels */
229 err = mrstouch_ts_chan_read(tsdev->asr, MRST_TS_CHAN10, z, &zm);
230 if (err)
231 goto ipc_error;
232
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100233 return 0;
234
235ipc_error:
Alek Du36466a12010-08-31 22:57:30 -0700236 dev_err(tsdev->dev, "ipc error during adc read\n");
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100237 return err;
238}
239
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700240
241/*************************** Freescale Interface ************************/
242
243static int mrstouch_fs_adc_read_prepare(struct mrstouch_dev *tsdev)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100244{
245 int err, count;
246 u16 chan;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100247 u16 reg[5];
248 u8 data[5];
249
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700250 /* Stop the ADC */
251 err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x00, 0x02);
252 if (err)
253 goto ipc_error;
254
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100255 chan = PMICADDR0 + tsdev->asr;
256
257 /* Set X BIAS */
258 for (count = 0; count <= 3; count++) {
259 reg[count] = chan++;
260 data[count] = 0x2A;
261 }
262 reg[count] = chan++; /* Dummy */
263 data[count] = 0;
264
265 err = intel_scu_ipc_writev(reg, data, 5);
266 if (err)
267 goto ipc_error;
268
269 msleep(WAIT_ADC_COMPLETION);
270
271 /* Set Y BIAS */
272 for (count = 0; count <= 3; count++) {
273 reg[count] = chan++;
274 data[count] = 0x4A;
275 }
276 reg[count] = chan++; /* Dummy */
277 data[count] = 0;
278
279 err = intel_scu_ipc_writev(reg, data, 5);
280 if (err)
281 goto ipc_error;
282
283 msleep(WAIT_ADC_COMPLETION);
284
285 /* Set Z BIAS */
286 err = intel_scu_ipc_iowrite32(chan + 2, 0x8A8A8A8A);
287 if (err)
288 goto ipc_error;
289
290 msleep(WAIT_ADC_COMPLETION);
291
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700292 return 0;
293
294ipc_error:
Alek Du36466a12010-08-31 22:57:30 -0700295 dev_err(tsdev->dev, "ipc error during %s\n", __func__);
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700296 return err;
297}
298
299static int mrstouch_fs_adc_read(struct mrstouch_dev *tsdev,
300 u16 *x, u16 *y, u16 *z)
301{
302 int err;
303 u16 result;
304 u16 reg[4];
305 u8 data[4];
306
307 result = PMIC_REG_ADCSNS0H + tsdev->asr;
308
309 reg[0] = result + 4;
310 reg[1] = result + 5;
311 reg[2] = result + 16;
312 reg[3] = result + 17;
313
314 err = intel_scu_ipc_readv(reg, data, 4);
315 if (err)
316 goto ipc_error;
317
318 *x = data[0] << 3; /* Higher 7 bits */
319 *x |= data[1] & 0x7; /* Lower 3 bits */
320 *x &= 0x3FF;
321
322 *y = data[2] << 3; /* Higher 7 bits */
323 *y |= data[3] & 0x7; /* Lower 3 bits */
324 *y &= 0x3FF;
325
326 /* Read Z value */
327 reg[0] = result + 28;
328 reg[1] = result + 29;
329
330 err = intel_scu_ipc_readv(reg, data, 4);
331 if (err)
332 goto ipc_error;
333
334 *z = data[0] << 3; /* Higher 7 bits */
335 *z |= data[1] & 0x7; /* Lower 3 bits */
336 *z &= 0x3FF;
337
338 return 0;
339
340ipc_error:
Alek Du36466a12010-08-31 22:57:30 -0700341 dev_err(tsdev->dev, "ipc error during %s\n", __func__);
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700342 return err;
343}
344
345static int mrstouch_fs_adc_read_finish(struct mrstouch_dev *tsdev)
346{
347 int err, count;
348 u16 chan;
349 u16 reg[5];
350 u8 data[5];
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100351
352 /* Clear all TS channels */
353 chan = PMICADDR0 + tsdev->asr;
354 for (count = 0; count <= 4; count++) {
355 reg[count] = chan++;
356 data[count] = 0;
357 }
358 err = intel_scu_ipc_writev(reg, data, 5);
359 if (err)
360 goto ipc_error;
361
362 for (count = 0; count <= 4; count++) {
363 reg[count] = chan++;
364 data[count] = 0;
365 }
366 err = intel_scu_ipc_writev(reg, data, 5);
367 if (err)
368 goto ipc_error;
369
370 err = intel_scu_ipc_iowrite32(chan + 2, 0x00000000);
371 if (err)
372 goto ipc_error;
373
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700374 /* Start ADC */
375 err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, 0x02, 0x02);
376 if (err)
377 goto ipc_error;
378
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100379 return 0;
380
381ipc_error:
Alek Du36466a12010-08-31 22:57:30 -0700382 dev_err(tsdev->dev, "ipc error during %s\n", __func__);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100383 return err;
384}
385
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700386static void mrstouch_report_event(struct input_dev *input,
387 unsigned int x, unsigned int y, unsigned int z)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100388{
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700389 if (z > MRST_PRESSURE_NOMINAL) {
390 /* Pen touched, report button touch and coordinates */
391 input_report_key(input, BTN_TOUCH, 1);
392 input_report_abs(input, ABS_X, x);
393 input_report_abs(input, ABS_Y, y);
394 } else {
395 input_report_key(input, BTN_TOUCH, 0);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100396 }
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100397
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700398 input_report_abs(input, ABS_PRESSURE, z);
399 input_sync(input);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100400}
401
402/* PENDET interrupt handler */
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700403static irqreturn_t mrstouch_pendet_irq(int irq, void *dev_id)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100404{
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700405 struct mrstouch_dev *tsdev = dev_id;
406 u16 x, y, z;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100407
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700408 /*
409 * Should we lower thread priority? Probably not, since we are
410 * not spinning but sleeping...
411 */
412
413 if (tsdev->read_prepare(tsdev))
414 goto out;
415
416 do {
417 if (tsdev->read(tsdev, &x, &y, &z))
418 break;
419
420 mrstouch_report_event(tsdev->input, x, y, z);
421 } while (z > MRST_PRESSURE_NOMINAL);
422
423 tsdev->read_finish(tsdev);
424
425out:
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100426 return IRQ_HANDLED;
427}
428
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700429/* Utility to read PMIC ID */
Bill Pemberton5298cc42012-11-23 21:38:25 -0800430static int mrstouch_read_pmic_id(uint *vendor, uint *rev)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100431{
432 int err;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700433 u8 r;
434
435 err = intel_scu_ipc_ioread8(PMIC_REG_ID1, &r);
436 if (err)
437 return err;
438
439 *vendor = r & 0x7;
440 *rev = (r >> 3) & 0x7;
441
442 return 0;
443}
444
445/*
446 * Parse ADC channels to find end of the channel configured by other ADC user
447 * NEC and MAXIM requires 4 channels and FreeScale needs 18 channels
448 */
Bill Pemberton5298cc42012-11-23 21:38:25 -0800449static int mrstouch_chan_parse(struct mrstouch_dev *tsdev)
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700450{
Axel Line449edb2011-07-18 17:09:05 -0700451 int found = 0;
452 int err, i;
Arjan van de Ven409d5682010-08-31 22:57:31 -0700453 u8 r8;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700454
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700455 for (i = 0; i < MRSTOUCH_MAX_CHANNELS; i++) {
Arjan van de Ven409d5682010-08-31 22:57:31 -0700456 err = intel_scu_ipc_ioread8(PMICADDR0 + i, &r8);
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700457 if (err)
458 return err;
459
Arjan van de Ven409d5682010-08-31 22:57:31 -0700460 if (r8 == END_OF_CHANNEL) {
461 found = i;
462 break;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700463 }
464 }
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700465
466 if (tsdev->vendor == PMIC_VENDOR_FS) {
Axel Line449edb2011-07-18 17:09:05 -0700467 if (found > MRSTOUCH_MAX_CHANNELS - 18)
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700468 return -ENOSPC;
469 } else {
Axel Line449edb2011-07-18 17:09:05 -0700470 if (found > MRSTOUCH_MAX_CHANNELS - 4)
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700471 return -ENOSPC;
472 }
Axel Line449edb2011-07-18 17:09:05 -0700473
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700474 return found;
475}
476
477
478/*
479 * Writes touch screen channels to ADC address selection registers
480 */
Bill Pemberton5298cc42012-11-23 21:38:25 -0800481static int mrstouch_ts_chan_set(uint offset)
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700482{
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700483 u16 chan;
Arjan van de Ven409d5682010-08-31 22:57:31 -0700484
485 int ret, count;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700486
487 chan = PMICADDR0 + offset;
488 for (count = 0; count <= 3; count++) {
Arjan van de Ven409d5682010-08-31 22:57:31 -0700489 ret = intel_scu_ipc_iowrite8(chan++, MRST_TS_CHAN10 + count);
490 if (ret)
491 return ret;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700492 }
Arjan van de Ven409d5682010-08-31 22:57:31 -0700493 return intel_scu_ipc_iowrite8(chan++, END_OF_CHANNEL);
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700494}
495
496/* Initialize ADC */
Bill Pemberton5298cc42012-11-23 21:38:25 -0800497static int mrstouch_adc_init(struct mrstouch_dev *tsdev)
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700498{
499 int err, start;
500 u8 ra, rm;
501
502 err = mrstouch_read_pmic_id(&tsdev->vendor, &tsdev->rev);
503 if (err) {
Alek Du36466a12010-08-31 22:57:30 -0700504 dev_err(tsdev->dev, "Unable to read PMIC id\n");
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700505 return err;
506 }
507
508 switch (tsdev->vendor) {
509 case PMIC_VENDOR_NEC:
510 case PMIC_VENDOR_MAXIM:
511 tsdev->read_prepare = mrstouch_nec_adc_read_prepare;
512 tsdev->read = mrstouch_nec_adc_read;
513 tsdev->read_finish = mrstouch_nec_adc_read_finish;
514 break;
515
516 case PMIC_VENDOR_FS:
517 tsdev->read_prepare = mrstouch_fs_adc_read_prepare;
518 tsdev->read = mrstouch_fs_adc_read;
519 tsdev->read_finish = mrstouch_fs_adc_read_finish;
520 break;
521
522 default:
Alek Du36466a12010-08-31 22:57:30 -0700523 dev_err(tsdev->dev,
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700524 "Unsupported touchscreen: %d\n", tsdev->vendor);
525 return -ENXIO;
526 }
527
528 start = mrstouch_chan_parse(tsdev);
529 if (start < 0) {
Alek Du36466a12010-08-31 22:57:30 -0700530 dev_err(tsdev->dev, "Unable to parse channels\n");
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700531 return start;
532 }
533
534 tsdev->asr = start;
535
536 /*
537 * ADC power on, start, enable PENDET and set loop delay
538 * ADC loop delay is set to 4.5 ms approximately
539 * Loop delay more than this results in jitter in adc readings
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300540 * Setting loop delay to 0 (continuous loop) in MAXIM stops PENDET
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700541 * interrupt generation sometimes.
542 */
543
544 if (tsdev->vendor == PMIC_VENDOR_FS) {
545 ra = 0xE0 | ADC_LOOP_DELAY0;
546 rm = 0x5;
547 } else {
548 /* NEC and MAXIm not consistent with loop delay 0 */
549 ra = 0xE0 | ADC_LOOP_DELAY1;
550 rm = 0x0;
551
552 /* configure touch screen channels */
553 err = mrstouch_ts_chan_set(tsdev->asr);
554 if (err)
555 return err;
556 }
557
558 err = intel_scu_ipc_update_register(PMIC_REG_ADCCNTL1, ra, 0xE7);
559 if (err)
560 return err;
561
562 err = intel_scu_ipc_update_register(PMIC_REG_MADCINT, rm, 0x03);
563 if (err)
564 return err;
565
566 return 0;
567}
568
569
570/* Probe function for touch screen driver */
Bill Pemberton5298cc42012-11-23 21:38:25 -0800571static int mrstouch_probe(struct platform_device *pdev)
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700572{
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100573 struct mrstouch_dev *tsdev;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700574 struct input_dev *input;
575 int err;
Alek Du36466a12010-08-31 22:57:30 -0700576 int irq;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100577
Alek Du36466a12010-08-31 22:57:30 -0700578 irq = platform_get_irq(pdev, 0);
579 if (irq < 0) {
580 dev_err(&pdev->dev, "no interrupt assigned\n");
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100581 return -EINVAL;
582 }
583
584 tsdev = kzalloc(sizeof(struct mrstouch_dev), GFP_KERNEL);
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700585 input = input_allocate_device();
586 if (!tsdev || !input) {
Alek Du36466a12010-08-31 22:57:30 -0700587 dev_err(&pdev->dev, "unable to allocate memory\n");
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700588 err = -ENOMEM;
589 goto err_free_mem;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100590 }
591
Alek Du36466a12010-08-31 22:57:30 -0700592 tsdev->dev = &pdev->dev;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700593 tsdev->input = input;
Alek Du36466a12010-08-31 22:57:30 -0700594 tsdev->irq = irq;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700595
596 snprintf(tsdev->phys, sizeof(tsdev->phys),
Alek Du36466a12010-08-31 22:57:30 -0700597 "%s/input0", dev_name(tsdev->dev));
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100598
599 err = mrstouch_adc_init(tsdev);
600 if (err) {
Alek Du36466a12010-08-31 22:57:30 -0700601 dev_err(&pdev->dev, "ADC initialization failed\n");
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700602 goto err_free_mem;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100603 }
604
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700605 input->name = "mrst_touchscreen";
606 input->phys = tsdev->phys;
Alek Du36466a12010-08-31 22:57:30 -0700607 input->dev.parent = tsdev->dev;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100608
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700609 input->id.vendor = tsdev->vendor;
610 input->id.version = tsdev->rev;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100611
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700612 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
613 input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100614
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700615 input_set_abs_params(tsdev->input, ABS_X,
616 MRST_X_MIN, MRST_X_MAX, MRST_X_FUZZ, 0);
617 input_set_abs_params(tsdev->input, ABS_Y,
618 MRST_Y_MIN, MRST_Y_MAX, MRST_Y_FUZZ, 0);
619 input_set_abs_params(tsdev->input, ABS_PRESSURE,
620 MRST_PRESSURE_MIN, MRST_PRESSURE_MAX, 0, 0);
621
622 err = request_threaded_irq(tsdev->irq, NULL, mrstouch_pendet_irq,
Lars-Peter Clausen9b7e31b2012-07-04 13:02:56 -0700623 IRQF_ONESHOT, "mrstouch", tsdev);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100624 if (err) {
Alek Du36466a12010-08-31 22:57:30 -0700625 dev_err(tsdev->dev, "unable to allocate irq\n");
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700626 goto err_free_mem;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100627 }
628
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700629 err = input_register_device(tsdev->input);
630 if (err) {
Alek Du36466a12010-08-31 22:57:30 -0700631 dev_err(tsdev->dev, "unable to register input device\n");
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700632 goto err_free_irq;
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100633 }
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700634
Alek Du36466a12010-08-31 22:57:30 -0700635 platform_set_drvdata(pdev, tsdev);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100636 return 0;
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700637
638err_free_irq:
639 free_irq(tsdev->irq, tsdev);
640err_free_mem:
641 input_free_device(input);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100642 kfree(tsdev);
643 return err;
644}
645
Bill Pembertone2619cf2012-11-23 21:50:47 -0800646static int mrstouch_remove(struct platform_device *pdev)
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100647{
Alek Du36466a12010-08-31 22:57:30 -0700648 struct mrstouch_dev *tsdev = platform_get_drvdata(pdev);
Dmitry Torokhov95b71272010-08-31 22:57:28 -0700649
650 free_irq(tsdev->irq, tsdev);
651 input_unregister_device(tsdev->input);
652 kfree(tsdev);
653
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100654 return 0;
655}
656
Alek Du36466a12010-08-31 22:57:30 -0700657static struct platform_driver mrstouch_driver = {
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100658 .driver = {
Alek Du36466a12010-08-31 22:57:30 -0700659 .name = "pmic_touch",
660 .owner = THIS_MODULE,
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100661 },
Alek Du36466a12010-08-31 22:57:30 -0700662 .probe = mrstouch_probe,
Bill Pemberton1cb0aa82012-11-23 21:27:39 -0800663 .remove = mrstouch_remove,
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100664};
JJ Dingcdcc96e2011-11-29 11:14:13 -0800665module_platform_driver(mrstouch_driver);
Sreedhara DSa4cff8b2010-06-01 12:50:06 +0100666
667MODULE_AUTHOR("Sreedhara Murthy. D.S, sreedhara.ds@intel.com");
668MODULE_DESCRIPTION("Intel Moorestown Resistive Touch Screen Driver");
669MODULE_LICENSE("GPL");