blob: 6bad23ee47a1a6cb4db82ed36a2e4ff462e62820 [file] [log] [blame]
Michael Hennerichb4be4682009-03-09 20:12:52 -07001/*
Mike Frysinger4397c982010-06-30 01:40:52 -07002 * AD7879/AD7889 based touchscreen and GPIO driver
Michael Hennerichb4be4682009-03-09 20:12:52 -07003 *
Mike Frysinger4397c982010-06-30 01:40:52 -07004 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
Michael Hennerichb4be4682009-03-09 20:12:52 -07005 *
Mike Frysinger4397c982010-06-30 01:40:52 -07006 * Licensed under the GPL-2 or later.
Michael Hennerichb4be4682009-03-09 20:12:52 -07007 *
8 * History:
9 * Copyright (c) 2005 David Brownell
10 * Copyright (c) 2006 Nokia Corporation
11 * Various changes: Imre Deak <imre.deak@nokia.com>
12 *
13 * Using code from:
14 * - corgi_ts.c
15 * Copyright (C) 2004-2005 Richard Purdie
16 * - omap_ts.[hc], ads7846.h, ts_osk.c
17 * Copyright (C) 2002 MontaVista Software
18 * Copyright (C) 2004 Texas Instruments
19 * Copyright (C) 2005 Dirk Behme
20 * - ad7877.c
21 * Copyright (C) 2006-2008 Analog Devices Inc.
22 */
23
24#include <linux/device.h>
Michael Hennerichb4be4682009-03-09 20:12:52 -070025#include <linux/delay.h>
26#include <linux/input.h>
27#include <linux/interrupt.h>
28#include <linux/irq.h>
Randy Dunlapa4deb142017-02-25 10:32:58 -080029#include <linux/property.h>
Dmitry Torokhov404a24c2017-02-16 23:22:38 -080030#include <linux/regmap.h>
Michael Hennerichb4be4682009-03-09 20:12:52 -070031#include <linux/slab.h>
Michael Hennerichec51b7f2010-01-19 00:27:58 -080032#include <linux/gpio.h>
Michael Hennerichb4be4682009-03-09 20:12:52 -070033
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -080034#include <linux/input/touchscreen.h>
Stefan Agner4774f402016-03-08 10:34:04 -080035#include <linux/platform_data/ad7879.h>
Paul Gortmakerd2d84422011-07-03 13:53:48 -040036#include <linux/module.h>
Mike Frysinger4397c982010-06-30 01:40:52 -070037#include "ad7879.h"
Michael Hennerichb4be4682009-03-09 20:12:52 -070038
39#define AD7879_REG_ZEROS 0
40#define AD7879_REG_CTRL1 1
41#define AD7879_REG_CTRL2 2
42#define AD7879_REG_CTRL3 3
43#define AD7879_REG_AUX1HIGH 4
44#define AD7879_REG_AUX1LOW 5
45#define AD7879_REG_TEMP1HIGH 6
46#define AD7879_REG_TEMP1LOW 7
47#define AD7879_REG_XPLUS 8
48#define AD7879_REG_YPLUS 9
49#define AD7879_REG_Z1 10
50#define AD7879_REG_Z2 11
51#define AD7879_REG_AUXVBAT 12
52#define AD7879_REG_TEMP 13
53#define AD7879_REG_REVID 14
54
55/* Control REG 1 */
56#define AD7879_TMR(x) ((x & 0xFF) << 0)
57#define AD7879_ACQ(x) ((x & 0x3) << 8)
58#define AD7879_MODE_NOC (0 << 10) /* Do not convert */
59#define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */
60#define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */
61#define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */
62#define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */
63
64/* Control REG 2 */
65#define AD7879_FCD(x) ((x & 0x3) << 0)
66#define AD7879_RESET (1 << 4)
67#define AD7879_MFS(x) ((x & 0x3) << 5)
68#define AD7879_AVG(x) ((x & 0x3) << 7)
69#define AD7879_SER (1 << 9) /* non-differential */
70#define AD7879_DFR (0 << 9) /* differential */
71#define AD7879_GPIOPOL (1 << 10)
72#define AD7879_GPIODIR (1 << 11)
73#define AD7879_GPIO_DATA (1 << 12)
74#define AD7879_GPIO_EN (1 << 13)
75#define AD7879_PM(x) ((x & 0x3) << 14)
76#define AD7879_PM_SHUTDOWN (0)
77#define AD7879_PM_DYN (1)
78#define AD7879_PM_FULLON (2)
79
80/* Control REG 3 */
81#define AD7879_TEMPMASK_BIT (1<<15)
82#define AD7879_AUXVBATMASK_BIT (1<<14)
83#define AD7879_INTMODE_BIT (1<<13)
84#define AD7879_GPIOALERTMASK_BIT (1<<12)
85#define AD7879_AUXLOW_BIT (1<<11)
86#define AD7879_AUXHIGH_BIT (1<<10)
87#define AD7879_TEMPLOW_BIT (1<<9)
88#define AD7879_TEMPHIGH_BIT (1<<8)
89#define AD7879_YPLUS_BIT (1<<7)
90#define AD7879_XPLUS_BIT (1<<6)
91#define AD7879_Z1_BIT (1<<5)
92#define AD7879_Z2_BIT (1<<4)
93#define AD7879_AUX_BIT (1<<3)
94#define AD7879_VBAT_BIT (1<<2)
95#define AD7879_TEMP_BIT (1<<1)
96
97enum {
Stefan Agner5f2940c4a2016-03-08 10:34:38 -080098 AD7879_SEQ_YPOS = 0,
99 AD7879_SEQ_XPOS = 1,
Michael Hennerichb4be4682009-03-09 20:12:52 -0700100 AD7879_SEQ_Z1 = 2,
101 AD7879_SEQ_Z2 = 3,
102 AD7879_NR_SENSE = 4,
103};
104
105#define MAX_12BIT ((1<<12)-1)
106#define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50)
107
Michael Hennerichb4be4682009-03-09 20:12:52 -0700108struct ad7879 {
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800109 struct regmap *regmap;
Mike Frysinger4397c982010-06-30 01:40:52 -0700110 struct device *dev;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700111 struct input_dev *input;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700112 struct timer_list timer;
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800113#ifdef CONFIG_GPIOLIB
114 struct gpio_chip gc;
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700115 struct mutex mutex;
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800116#endif
Mike Frysinger4397c982010-06-30 01:40:52 -0700117 unsigned int irq;
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700118 bool disabled; /* P: input->mutex */
119 bool suspended; /* P: input->mutex */
Michael Hennerich66808842012-07-06 10:44:19 -0700120 bool swap_xy;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700121 u16 conversion_data[AD7879_NR_SENSE];
122 char phys[32];
123 u8 first_conversion_delay;
124 u8 acquisition_time;
125 u8 averaging;
126 u8 pen_down_acc_interval;
127 u8 median;
128 u16 x_plate_ohms;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700129 u16 cmd_crtl1;
130 u16 cmd_crtl2;
131 u16 cmd_crtl3;
Michael Hennerichb584efc2010-10-28 14:59:05 -0700132 int x;
133 int y;
134 int Rt;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700135};
136
Mike Frysinger4397c982010-06-30 01:40:52 -0700137static int ad7879_read(struct ad7879 *ts, u8 reg)
138{
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800139 unsigned int val;
140 int error;
Mike Frysinger4397c982010-06-30 01:40:52 -0700141
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800142 error = regmap_read(ts->regmap, reg, &val);
143 if (error) {
144 dev_err(ts->dev, "failed to read register %#02x: %d\n",
145 reg, error);
146 return error;
147 }
148
149 return val;
Mike Frysinger4397c982010-06-30 01:40:52 -0700150}
151
152static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val)
153{
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800154 int error;
155
156 error = regmap_write(ts->regmap, reg, val);
157 if (error) {
158 dev_err(ts->dev,
159 "failed to write %#04x to register %#02x: %d\n",
160 val, reg, error);
161 return error;
162 }
163
164 return 0;
Mike Frysinger4397c982010-06-30 01:40:52 -0700165}
Michael Hennerichb4be4682009-03-09 20:12:52 -0700166
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700167static int ad7879_report(struct ad7879 *ts)
Michael Hennerichb4be4682009-03-09 20:12:52 -0700168{
169 struct input_dev *input_dev = ts->input;
170 unsigned Rt;
171 u16 x, y, z1, z2;
172
173 x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT;
174 y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT;
175 z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT;
176 z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT;
177
Michael Hennerich66808842012-07-06 10:44:19 -0700178 if (ts->swap_xy)
179 swap(x, y);
180
Michael Hennerichb4be4682009-03-09 20:12:52 -0700181 /*
182 * The samples processed here are already preprocessed by the AD7879.
Mike Frysinger4397c982010-06-30 01:40:52 -0700183 * The preprocessing function consists of a median and an averaging
184 * filter. The combination of these two techniques provides a robust
185 * solution, discarding the spurious noise in the signal and keeping
186 * only the data of interest. The size of both filters is
Stefan Agner4774f402016-03-08 10:34:04 -0800187 * programmable. (dev.platform_data, see linux/platform_data/ad7879.h)
188 * Other user-programmable conversion controls include variable
189 * acquisition time, and first conversion delay. Up to 16 averages can
190 * be taken per conversion.
Michael Hennerichb4be4682009-03-09 20:12:52 -0700191 */
192
193 if (likely(x && z1)) {
194 /* compute touch pressure resistance using equation #1 */
195 Rt = (z2 - z1) * x * ts->x_plate_ohms;
196 Rt /= z1;
197 Rt = (Rt + 2047) >> 12;
198
Michael Hennerichb584efc2010-10-28 14:59:05 -0700199 /*
200 * Sample found inconsistent, pressure is beyond
201 * the maximum. Don't report it to user space.
202 */
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800203 if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE))
Michael Hennerichb584efc2010-10-28 14:59:05 -0700204 return -EINVAL;
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700205
Michael Hennerichb584efc2010-10-28 14:59:05 -0700206 /*
207 * Note that we delay reporting events by one sample.
208 * This is done to avoid reporting last sample of the
209 * touch sequence, which may be incomplete if finger
210 * leaves the surface before last reading is taken.
211 */
212 if (timer_pending(&ts->timer)) {
213 /* Touch continues */
214 input_report_key(input_dev, BTN_TOUCH, 1);
215 input_report_abs(input_dev, ABS_X, ts->x);
216 input_report_abs(input_dev, ABS_Y, ts->y);
217 input_report_abs(input_dev, ABS_PRESSURE, ts->Rt);
218 input_sync(input_dev);
219 }
220
221 ts->x = x;
222 ts->y = y;
223 ts->Rt = Rt;
224
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700225 return 0;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700226 }
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700227
228 return -EINVAL;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700229}
230
Michael Hennerichb4be4682009-03-09 20:12:52 -0700231static void ad7879_ts_event_release(struct ad7879 *ts)
232{
233 struct input_dev *input_dev = ts->input;
234
235 input_report_abs(input_dev, ABS_PRESSURE, 0);
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700236 input_report_key(input_dev, BTN_TOUCH, 0);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700237 input_sync(input_dev);
238}
239
Kees Cookee03e3f2017-10-24 09:44:48 -0700240static void ad7879_timer(struct timer_list *t)
Michael Hennerichb4be4682009-03-09 20:12:52 -0700241{
Kees Cookee03e3f2017-10-24 09:44:48 -0700242 struct ad7879 *ts = from_timer(ts, t, timer);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700243
244 ad7879_ts_event_release(ts);
245}
246
247static irqreturn_t ad7879_irq(int irq, void *handle)
248{
249 struct ad7879 *ts = handle;
250
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800251 regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
252 ts->conversion_data, AD7879_NR_SENSE);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700253
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700254 if (!ad7879_report(ts))
255 mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700256
257 return IRQ_HANDLED;
258}
259
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700260static void __ad7879_enable(struct ad7879 *ts)
Michael Hennerichb4be4682009-03-09 20:12:52 -0700261{
Mike Frysinger4397c982010-06-30 01:40:52 -0700262 ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
263 ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3);
264 ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1);
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700265
266 enable_irq(ts->irq);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700267}
268
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700269static void __ad7879_disable(struct ad7879 *ts)
Michael Hennerichb4be4682009-03-09 20:12:52 -0700270{
Michael Hennerich4fecc202011-08-02 15:41:37 -0700271 u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) |
272 AD7879_PM(AD7879_PM_SHUTDOWN);
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700273 disable_irq(ts->irq);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700274
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700275 if (del_timer_sync(&ts->timer))
276 ad7879_ts_event_release(ts);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700277
Michael Hennerich4fecc202011-08-02 15:41:37 -0700278 ad7879_write(ts, AD7879_REG_CTRL2, reg);
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700279}
Michael Hennerichb4be4682009-03-09 20:12:52 -0700280
Michael Hennerichb4be4682009-03-09 20:12:52 -0700281
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700282static int ad7879_open(struct input_dev *input)
283{
284 struct ad7879 *ts = input_get_drvdata(input);
285
286 /* protected by input->mutex */
287 if (!ts->disabled && !ts->suspended)
288 __ad7879_enable(ts);
289
290 return 0;
291}
292
293static void ad7879_close(struct input_dev* input)
294{
295 struct ad7879 *ts = input_get_drvdata(input);
296
297 /* protected by input->mutex */
298 if (!ts->disabled && !ts->suspended)
299 __ad7879_disable(ts);
300}
301
Jingoo Han02b6a582014-11-02 00:04:14 -0700302static int __maybe_unused ad7879_suspend(struct device *dev)
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700303{
Dmitry Torokhov8672bd92011-11-14 00:32:09 -0800304 struct ad7879 *ts = dev_get_drvdata(dev);
305
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700306 mutex_lock(&ts->input->mutex);
307
308 if (!ts->suspended && !ts->disabled && ts->input->users)
309 __ad7879_disable(ts);
310
311 ts->suspended = true;
312
313 mutex_unlock(&ts->input->mutex);
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700314
Dmitry Torokhov8672bd92011-11-14 00:32:09 -0800315 return 0;
316}
317
Jingoo Han02b6a582014-11-02 00:04:14 -0700318static int __maybe_unused ad7879_resume(struct device *dev)
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700319{
Dmitry Torokhov8672bd92011-11-14 00:32:09 -0800320 struct ad7879 *ts = dev_get_drvdata(dev);
321
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700322 mutex_lock(&ts->input->mutex);
323
324 if (ts->suspended && !ts->disabled && ts->input->users)
325 __ad7879_enable(ts);
326
327 ts->suspended = false;
328
329 mutex_unlock(&ts->input->mutex);
Dmitry Torokhov8672bd92011-11-14 00:32:09 -0800330
331 return 0;
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700332}
Dmitry Torokhov8672bd92011-11-14 00:32:09 -0800333
334SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume);
335EXPORT_SYMBOL(ad7879_pm_ops);
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700336
337static void ad7879_toggle(struct ad7879 *ts, bool disable)
338{
339 mutex_lock(&ts->input->mutex);
340
341 if (!ts->suspended && ts->input->users != 0) {
342
343 if (disable) {
344 if (ts->disabled)
345 __ad7879_enable(ts);
346 } else {
347 if (!ts->disabled)
348 __ad7879_disable(ts);
349 }
Michael Hennerichb4be4682009-03-09 20:12:52 -0700350 }
351
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700352 ts->disabled = disable;
353
354 mutex_unlock(&ts->input->mutex);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700355}
Michael Hennerichb4be4682009-03-09 20:12:52 -0700356
357static ssize_t ad7879_disable_show(struct device *dev,
358 struct device_attribute *attr, char *buf)
359{
360 struct ad7879 *ts = dev_get_drvdata(dev);
361
362 return sprintf(buf, "%u\n", ts->disabled);
363}
364
365static ssize_t ad7879_disable_store(struct device *dev,
366 struct device_attribute *attr,
367 const char *buf, size_t count)
368{
369 struct ad7879 *ts = dev_get_drvdata(dev);
JJ Ding76496e72011-11-09 10:20:14 -0800370 unsigned int val;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700371 int error;
372
JJ Ding76496e72011-11-09 10:20:14 -0800373 error = kstrtouint(buf, 10, &val);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700374 if (error)
375 return error;
376
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700377 ad7879_toggle(ts, val);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700378
379 return count;
380}
381
382static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store);
383
Michael Hennerichb4be4682009-03-09 20:12:52 -0700384static struct attribute *ad7879_attributes[] = {
385 &dev_attr_disable.attr,
Michael Hennerichb4be4682009-03-09 20:12:52 -0700386 NULL
387};
388
389static const struct attribute_group ad7879_attr_group = {
390 .attrs = ad7879_attributes,
391};
392
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800393#ifdef CONFIG_GPIOLIB
394static int ad7879_gpio_direction_input(struct gpio_chip *chip,
395 unsigned gpio)
396{
Linus Walleijd94780442015-12-08 16:35:27 +0100397 struct ad7879 *ts = gpiochip_get_data(chip);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800398 int err;
399
400 mutex_lock(&ts->mutex);
401 ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL;
Mike Frysinger4397c982010-06-30 01:40:52 -0700402 err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800403 mutex_unlock(&ts->mutex);
404
405 return err;
406}
407
408static int ad7879_gpio_direction_output(struct gpio_chip *chip,
409 unsigned gpio, int level)
410{
Linus Walleijd94780442015-12-08 16:35:27 +0100411 struct ad7879 *ts = gpiochip_get_data(chip);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800412 int err;
413
414 mutex_lock(&ts->mutex);
415 ts->cmd_crtl2 &= ~AD7879_GPIODIR;
416 ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL;
417 if (level)
418 ts->cmd_crtl2 |= AD7879_GPIO_DATA;
419 else
420 ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
421
Mike Frysinger4397c982010-06-30 01:40:52 -0700422 err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800423 mutex_unlock(&ts->mutex);
424
425 return err;
426}
427
428static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
429{
Linus Walleijd94780442015-12-08 16:35:27 +0100430 struct ad7879 *ts = gpiochip_get_data(chip);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800431 u16 val;
432
433 mutex_lock(&ts->mutex);
Mike Frysinger4397c982010-06-30 01:40:52 -0700434 val = ad7879_read(ts, AD7879_REG_CTRL2);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800435 mutex_unlock(&ts->mutex);
436
437 return !!(val & AD7879_GPIO_DATA);
438}
439
440static void ad7879_gpio_set_value(struct gpio_chip *chip,
441 unsigned gpio, int value)
442{
Linus Walleijd94780442015-12-08 16:35:27 +0100443 struct ad7879 *ts = gpiochip_get_data(chip);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800444
445 mutex_lock(&ts->mutex);
446 if (value)
447 ts->cmd_crtl2 |= AD7879_GPIO_DATA;
448 else
449 ts->cmd_crtl2 &= ~AD7879_GPIO_DATA;
450
Mike Frysinger4397c982010-06-30 01:40:52 -0700451 ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800452 mutex_unlock(&ts->mutex);
453}
454
Mike Frysinger4397c982010-06-30 01:40:52 -0700455static int ad7879_gpio_add(struct ad7879 *ts,
456 const struct ad7879_platform_data *pdata)
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800457{
Dmitry Torokhovb621e302017-02-17 10:45:59 -0800458 bool gpio_export;
459 int gpio_base;
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800460 int ret = 0;
461
Dmitry Torokhovb621e302017-02-17 10:45:59 -0800462 if (pdata) {
463 gpio_export = pdata->gpio_export;
464 gpio_base = pdata->gpio_base;
465 } else {
466 gpio_export = device_property_read_bool(ts->dev,
467 "gpio-controller");
468 gpio_base = -1;
469 }
470
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700471 mutex_init(&ts->mutex);
472
Dmitry Torokhovb621e302017-02-17 10:45:59 -0800473 if (gpio_export) {
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800474 ts->gc.direction_input = ad7879_gpio_direction_input;
475 ts->gc.direction_output = ad7879_gpio_direction_output;
476 ts->gc.get = ad7879_gpio_get_value;
477 ts->gc.set = ad7879_gpio_set_value;
478 ts->gc.can_sleep = 1;
Dmitry Torokhovb621e302017-02-17 10:45:59 -0800479 ts->gc.base = gpio_base;
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800480 ts->gc.ngpio = 1;
481 ts->gc.label = "AD7879-GPIO";
482 ts->gc.owner = THIS_MODULE;
Linus Walleij58383c782015-11-04 09:56:26 +0100483 ts->gc.parent = ts->dev;
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800484
Dmitry Torokhov069b2e2c2017-02-17 09:29:40 -0800485 ret = devm_gpiochip_add_data(ts->dev, &ts->gc, ts);
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800486 if (ret)
Mike Frysinger4397c982010-06-30 01:40:52 -0700487 dev_err(ts->dev, "failed to register gpio %d\n",
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800488 ts->gc.base);
489 }
490
491 return ret;
492}
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800493#else
Dmitry Torokhov069b2e2c2017-02-17 09:29:40 -0800494static int ad7879_gpio_add(struct ad7879 *ts,
495 const struct ad7879_platform_data *pdata)
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800496{
497 return 0;
498}
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800499#endif
500
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800501static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts)
502{
503 int err;
504 u32 tmp;
505
506 err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp);
507 if (err) {
508 dev_err(dev, "failed to get resistance-plate-x property\n");
509 return err;
510 }
511 ts->x_plate_ohms = (u16)tmp;
512
513 device_property_read_u8(dev, "adi,first-conversion-delay",
514 &ts->first_conversion_delay);
515 device_property_read_u8(dev, "adi,acquisition-time",
516 &ts->acquisition_time);
517 device_property_read_u8(dev, "adi,median-filter-size", &ts->median);
518 device_property_read_u8(dev, "adi,averaging", &ts->averaging);
519 device_property_read_u8(dev, "adi,conversion-interval",
520 &ts->pen_down_acc_interval);
521
522 ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y");
523
524 return 0;
525}
526
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800527int ad7879_probe(struct device *dev, struct regmap *regmap,
528 int irq, u16 bustype, u8 devid)
Michael Hennerichb4be4682009-03-09 20:12:52 -0700529{
Jingoo Hanc838cb32013-12-05 19:21:10 -0800530 struct ad7879_platform_data *pdata = dev_get_platdata(dev);
Mike Frysinger4397c982010-06-30 01:40:52 -0700531 struct ad7879 *ts;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700532 struct input_dev *input_dev;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700533 int err;
534 u16 revid;
535
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800536 if (irq <= 0) {
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800537 dev_err(dev, "No IRQ specified\n");
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800538 return -EINVAL;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700539 }
540
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800541 ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
542 if (!ts)
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800543 return -ENOMEM;
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800544
545 if (pdata) {
546 /* Platform data use swapped axis (backward compatibility) */
547 ts->swap_xy = !pdata->swap_xy;
548
549 ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
550
551 ts->first_conversion_delay = pdata->first_conversion_delay;
552 ts->acquisition_time = pdata->acquisition_time;
553 ts->averaging = pdata->averaging;
554 ts->pen_down_acc_interval = pdata->pen_down_acc_interval;
555 ts->median = pdata->median;
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800556 } else {
Dmitry Torokhov3a97c3d2017-02-28 11:50:56 -0800557 err = ad7879_parse_dt(dev, ts);
558 if (err)
559 return err;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700560 }
561
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800562 input_dev = devm_input_allocate_device(dev);
563 if (!input_dev) {
564 dev_err(dev, "Failed to allocate input device\n");
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800565 return -ENOMEM;
Mike Frysinger4397c982010-06-30 01:40:52 -0700566 }
Michael Hennerichb4be4682009-03-09 20:12:52 -0700567
Mike Frysinger4397c982010-06-30 01:40:52 -0700568 ts->dev = dev;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700569 ts->input = input_dev;
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700570 ts->irq = irq;
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800571 ts->regmap = regmap;
Stefan Agner5f2940c4a2016-03-08 10:34:38 -0800572
Kees Cookee03e3f2017-10-24 09:44:48 -0700573 timer_setup(&ts->timer, ad7879_timer, 0);
Mike Frysinger4397c982010-06-30 01:40:52 -0700574 snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev));
Michael Hennerichb4be4682009-03-09 20:12:52 -0700575
576 input_dev->name = "AD7879 Touchscreen";
577 input_dev->phys = ts->phys;
Mike Frysinger4397c982010-06-30 01:40:52 -0700578 input_dev->dev.parent = dev;
Dmitry Torokhov404a24c2017-02-16 23:22:38 -0800579 input_dev->id.bustype = bustype;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700580
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700581 input_dev->open = ad7879_open;
582 input_dev->close = ad7879_close;
583
584 input_set_drvdata(input_dev, ts);
585
Dmitry Torokhov4f959632017-02-28 11:56:20 -0800586 input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
Michael Hennerich963ce8a2010-06-30 14:51:10 -0700587
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800588 if (pdata) {
589 input_set_abs_params(input_dev, ABS_X,
590 pdata->x_min ? : 0,
591 pdata->x_max ? : MAX_12BIT,
592 0, 0);
593 input_set_abs_params(input_dev, ABS_Y,
594 pdata->y_min ? : 0,
595 pdata->y_max ? : MAX_12BIT,
596 0, 0);
597 input_set_abs_params(input_dev, ABS_PRESSURE,
598 pdata->pressure_min,
599 pdata->pressure_max ? : ~0,
600 0, 0);
601 } else {
602 input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0);
603 input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0);
Dmitry Torokhov4f959632017-02-28 11:56:20 -0800604 input_set_capability(input_dev, EV_ABS, ABS_PRESSURE);
Hans de Goedeed7c9872016-07-15 14:05:29 -0700605 touchscreen_parse_properties(input_dev, false, NULL);
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800606 if (!input_abs_get_max(input_dev, ABS_PRESSURE)) {
607 dev_err(dev, "Touchscreen pressure is not specified\n");
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800608 return -EINVAL;
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800609 }
610 }
Michael Hennerichb4be4682009-03-09 20:12:52 -0700611
Mike Frysinger4397c982010-06-30 01:40:52 -0700612 err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700613 if (err < 0) {
Mike Frysinger4397c982010-06-30 01:40:52 -0700614 dev_err(dev, "Failed to write %s\n", input_dev->name);
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800615 return err;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700616 }
617
Mike Frysinger4397c982010-06-30 01:40:52 -0700618 revid = ad7879_read(ts, AD7879_REG_REVID);
619 input_dev->id.product = (revid & 0xff);
620 input_dev->id.version = revid >> 8;
621 if (input_dev->id.product != devid) {
622 dev_err(dev, "Failed to probe %s (%x vs %x)\n",
623 input_dev->name, devid, revid);
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800624 return -ENODEV;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700625 }
626
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800627 ts->cmd_crtl3 = AD7879_YPLUS_BIT |
628 AD7879_XPLUS_BIT |
629 AD7879_Z2_BIT |
630 AD7879_Z1_BIT |
631 AD7879_TEMPMASK_BIT |
632 AD7879_AUXVBATMASK_BIT |
633 AD7879_GPIOALERTMASK_BIT;
634
635 ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR |
636 AD7879_AVG(ts->averaging) |
637 AD7879_MFS(ts->median) |
638 AD7879_FCD(ts->first_conversion_delay);
639
640 ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 |
641 AD7879_ACQ(ts->acquisition_time) |
642 AD7879_TMR(ts->pen_down_acc_interval);
643
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800644 err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq,
645 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
646 dev_name(dev), ts);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700647 if (err) {
Stefan Agnerfa6e3ca2016-03-08 10:35:24 -0800648 dev_err(dev, "Failed to request IRQ: %d\n", err);
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800649 return err;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700650 }
651
Dmitry Torokhov14fbbc32010-06-30 14:50:51 -0700652 __ad7879_disable(ts);
653
Andi Shytia8b4aa02017-09-29 16:47:53 -0700654 err = devm_device_add_group(dev, &ad7879_attr_group);
Dmitry Torokhov069b2e2c2017-02-17 09:29:40 -0800655 if (err)
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800656 return err;
Dmitry Torokhov069b2e2c2017-02-17 09:29:40 -0800657
658 err = ad7879_gpio_add(ts, pdata);
659 if (err)
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800660 return err;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700661
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800662 err = input_register_device(input_dev);
663 if (err)
Dmitry Torokhov4e340252017-02-28 11:43:52 -0800664 return err;
Michael Hennerichec51b7f2010-01-19 00:27:58 -0800665
Dmitry Torokhovaf160c542017-02-28 13:57:21 -0800666 dev_set_drvdata(dev, ts);
667
Dmitry Torokhov069b2e2c2017-02-17 09:29:40 -0800668 return 0;
Michael Hennerichb4be4682009-03-09 20:12:52 -0700669}
Mike Frysinger4397c982010-06-30 01:40:52 -0700670EXPORT_SYMBOL(ad7879_probe);
Michael Hennerichb4be4682009-03-09 20:12:52 -0700671
Michael Hennerich2581e5d2017-02-22 10:34:20 -0800672MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
Michael Hennerichb4be4682009-03-09 20:12:52 -0700673MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver");
674MODULE_LICENSE("GPL");