Commit | Line | Data |
---|---|---|
b4be468c | 1 | /* |
4397c98a | 2 | * AD7879/AD7889 based touchscreen and GPIO driver |
b4be468c | 3 | * |
4397c98a | 4 | * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc. |
b4be468c | 5 | * |
4397c98a | 6 | * Licensed under the GPL-2 or later. |
b4be468c MH |
7 | * |
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> | |
b4be468c MH |
25 | #include <linux/delay.h> |
26 | #include <linux/input.h> | |
27 | #include <linux/interrupt.h> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/slab.h> | |
b4be468c MH |
30 | #include <linux/spi/spi.h> |
31 | #include <linux/i2c.h> | |
ec51b7f5 | 32 | #include <linux/gpio.h> |
b4be468c | 33 | |
fa6e3ca2 | 34 | #include <linux/input/touchscreen.h> |
4774f400 | 35 | #include <linux/platform_data/ad7879.h> |
d2d8442d | 36 | #include <linux/module.h> |
4397c98a | 37 | #include "ad7879.h" |
b4be468c MH |
38 | |
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 | ||
97 | enum { | |
5f2940c4 SA |
98 | AD7879_SEQ_YPOS = 0, |
99 | AD7879_SEQ_XPOS = 1, | |
b4be468c MH |
100 | 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 | ||
b4be468c | 108 | struct ad7879 { |
4397c98a MF |
109 | const struct ad7879_bus_ops *bops; |
110 | ||
111 | struct device *dev; | |
b4be468c | 112 | struct input_dev *input; |
b4be468c | 113 | struct timer_list timer; |
ec51b7f5 MH |
114 | #ifdef CONFIG_GPIOLIB |
115 | struct gpio_chip gc; | |
14fbbc36 | 116 | struct mutex mutex; |
ec51b7f5 | 117 | #endif |
4397c98a | 118 | unsigned int irq; |
14fbbc36 DT |
119 | bool disabled; /* P: input->mutex */ |
120 | bool suspended; /* P: input->mutex */ | |
6680884a | 121 | bool swap_xy; |
b4be468c MH |
122 | u16 conversion_data[AD7879_NR_SENSE]; |
123 | char phys[32]; | |
124 | u8 first_conversion_delay; | |
125 | u8 acquisition_time; | |
126 | u8 averaging; | |
127 | u8 pen_down_acc_interval; | |
128 | u8 median; | |
129 | u16 x_plate_ohms; | |
b4be468c MH |
130 | u16 cmd_crtl1; |
131 | u16 cmd_crtl2; | |
132 | u16 cmd_crtl3; | |
b584efc9 MH |
133 | int x; |
134 | int y; | |
135 | int Rt; | |
b4be468c MH |
136 | }; |
137 | ||
4397c98a MF |
138 | static int ad7879_read(struct ad7879 *ts, u8 reg) |
139 | { | |
140 | return ts->bops->read(ts->dev, reg); | |
141 | } | |
142 | ||
143 | static int ad7879_multi_read(struct ad7879 *ts, u8 first_reg, u8 count, u16 *buf) | |
144 | { | |
145 | return ts->bops->multi_read(ts->dev, first_reg, count, buf); | |
146 | } | |
147 | ||
148 | static int ad7879_write(struct ad7879 *ts, u8 reg, u16 val) | |
149 | { | |
150 | return ts->bops->write(ts->dev, reg, val); | |
151 | } | |
b4be468c | 152 | |
963ce8ae | 153 | static int ad7879_report(struct ad7879 *ts) |
b4be468c MH |
154 | { |
155 | struct input_dev *input_dev = ts->input; | |
156 | unsigned Rt; | |
157 | u16 x, y, z1, z2; | |
158 | ||
159 | x = ts->conversion_data[AD7879_SEQ_XPOS] & MAX_12BIT; | |
160 | y = ts->conversion_data[AD7879_SEQ_YPOS] & MAX_12BIT; | |
161 | z1 = ts->conversion_data[AD7879_SEQ_Z1] & MAX_12BIT; | |
162 | z2 = ts->conversion_data[AD7879_SEQ_Z2] & MAX_12BIT; | |
163 | ||
6680884a MH |
164 | if (ts->swap_xy) |
165 | swap(x, y); | |
166 | ||
b4be468c MH |
167 | /* |
168 | * The samples processed here are already preprocessed by the AD7879. | |
4397c98a MF |
169 | * The preprocessing function consists of a median and an averaging |
170 | * filter. The combination of these two techniques provides a robust | |
171 | * solution, discarding the spurious noise in the signal and keeping | |
172 | * only the data of interest. The size of both filters is | |
4774f400 SA |
173 | * programmable. (dev.platform_data, see linux/platform_data/ad7879.h) |
174 | * Other user-programmable conversion controls include variable | |
175 | * acquisition time, and first conversion delay. Up to 16 averages can | |
176 | * be taken per conversion. | |
b4be468c MH |
177 | */ |
178 | ||
179 | if (likely(x && z1)) { | |
180 | /* compute touch pressure resistance using equation #1 */ | |
181 | Rt = (z2 - z1) * x * ts->x_plate_ohms; | |
182 | Rt /= z1; | |
183 | Rt = (Rt + 2047) >> 12; | |
184 | ||
b584efc9 MH |
185 | /* |
186 | * Sample found inconsistent, pressure is beyond | |
187 | * the maximum. Don't report it to user space. | |
188 | */ | |
fa6e3ca2 | 189 | if (Rt > input_abs_get_max(input_dev, ABS_PRESSURE)) |
b584efc9 MH |
190 | return -EINVAL; |
191 | ||
192 | /* | |
193 | * Note that we delay reporting events by one sample. | |
194 | * This is done to avoid reporting last sample of the | |
195 | * touch sequence, which may be incomplete if finger | |
196 | * leaves the surface before last reading is taken. | |
197 | */ | |
198 | if (timer_pending(&ts->timer)) { | |
199 | /* Touch continues */ | |
963ce8ae | 200 | input_report_key(input_dev, BTN_TOUCH, 1); |
b584efc9 MH |
201 | input_report_abs(input_dev, ABS_X, ts->x); |
202 | input_report_abs(input_dev, ABS_Y, ts->y); | |
203 | input_report_abs(input_dev, ABS_PRESSURE, ts->Rt); | |
204 | input_sync(input_dev); | |
205 | } | |
206 | ||
207 | ts->x = x; | |
208 | ts->y = y; | |
209 | ts->Rt = Rt; | |
963ce8ae | 210 | |
963ce8ae | 211 | return 0; |
b4be468c | 212 | } |
963ce8ae MH |
213 | |
214 | return -EINVAL; | |
b4be468c MH |
215 | } |
216 | ||
b4be468c MH |
217 | static void ad7879_ts_event_release(struct ad7879 *ts) |
218 | { | |
219 | struct input_dev *input_dev = ts->input; | |
220 | ||
221 | input_report_abs(input_dev, ABS_PRESSURE, 0); | |
963ce8ae | 222 | input_report_key(input_dev, BTN_TOUCH, 0); |
b4be468c MH |
223 | input_sync(input_dev); |
224 | } | |
225 | ||
226 | static void ad7879_timer(unsigned long handle) | |
227 | { | |
228 | struct ad7879 *ts = (void *)handle; | |
229 | ||
230 | ad7879_ts_event_release(ts); | |
231 | } | |
232 | ||
233 | static irqreturn_t ad7879_irq(int irq, void *handle) | |
234 | { | |
235 | struct ad7879 *ts = handle; | |
236 | ||
4397c98a | 237 | ad7879_multi_read(ts, AD7879_REG_XPLUS, AD7879_NR_SENSE, ts->conversion_data); |
b4be468c | 238 | |
963ce8ae MH |
239 | if (!ad7879_report(ts)) |
240 | mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT); | |
b4be468c MH |
241 | |
242 | return IRQ_HANDLED; | |
243 | } | |
244 | ||
14fbbc36 | 245 | static void __ad7879_enable(struct ad7879 *ts) |
b4be468c | 246 | { |
4397c98a MF |
247 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
248 | ad7879_write(ts, AD7879_REG_CTRL3, ts->cmd_crtl3); | |
249 | ad7879_write(ts, AD7879_REG_CTRL1, ts->cmd_crtl1); | |
14fbbc36 DT |
250 | |
251 | enable_irq(ts->irq); | |
b4be468c MH |
252 | } |
253 | ||
14fbbc36 | 254 | static void __ad7879_disable(struct ad7879 *ts) |
b4be468c | 255 | { |
4fecc208 MH |
256 | u16 reg = (ts->cmd_crtl2 & ~AD7879_PM(-1)) | |
257 | AD7879_PM(AD7879_PM_SHUTDOWN); | |
14fbbc36 | 258 | disable_irq(ts->irq); |
b4be468c | 259 | |
14fbbc36 DT |
260 | if (del_timer_sync(&ts->timer)) |
261 | ad7879_ts_event_release(ts); | |
b4be468c | 262 | |
4fecc208 | 263 | ad7879_write(ts, AD7879_REG_CTRL2, reg); |
14fbbc36 | 264 | } |
b4be468c | 265 | |
b4be468c | 266 | |
14fbbc36 DT |
267 | static int ad7879_open(struct input_dev *input) |
268 | { | |
269 | struct ad7879 *ts = input_get_drvdata(input); | |
b4be468c | 270 | |
14fbbc36 DT |
271 | /* protected by input->mutex */ |
272 | if (!ts->disabled && !ts->suspended) | |
273 | __ad7879_enable(ts); | |
274 | ||
275 | return 0; | |
b4be468c MH |
276 | } |
277 | ||
14fbbc36 | 278 | static void ad7879_close(struct input_dev* input) |
b4be468c | 279 | { |
14fbbc36 DT |
280 | struct ad7879 *ts = input_get_drvdata(input); |
281 | ||
282 | /* protected by input->mutex */ | |
283 | if (!ts->disabled && !ts->suspended) | |
284 | __ad7879_disable(ts); | |
285 | } | |
286 | ||
02b6a58b | 287 | static int __maybe_unused ad7879_suspend(struct device *dev) |
14fbbc36 | 288 | { |
8672bd93 DT |
289 | struct ad7879 *ts = dev_get_drvdata(dev); |
290 | ||
14fbbc36 DT |
291 | mutex_lock(&ts->input->mutex); |
292 | ||
293 | if (!ts->suspended && !ts->disabled && ts->input->users) | |
294 | __ad7879_disable(ts); | |
295 | ||
296 | ts->suspended = true; | |
297 | ||
298 | mutex_unlock(&ts->input->mutex); | |
8672bd93 DT |
299 | |
300 | return 0; | |
14fbbc36 | 301 | } |
14fbbc36 | 302 | |
02b6a58b | 303 | static int __maybe_unused ad7879_resume(struct device *dev) |
14fbbc36 | 304 | { |
8672bd93 DT |
305 | struct ad7879 *ts = dev_get_drvdata(dev); |
306 | ||
14fbbc36 | 307 | mutex_lock(&ts->input->mutex); |
b4be468c | 308 | |
14fbbc36 DT |
309 | if (ts->suspended && !ts->disabled && ts->input->users) |
310 | __ad7879_enable(ts); | |
311 | ||
312 | ts->suspended = false; | |
313 | ||
314 | mutex_unlock(&ts->input->mutex); | |
8672bd93 DT |
315 | |
316 | return 0; | |
14fbbc36 | 317 | } |
8672bd93 DT |
318 | |
319 | SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume); | |
320 | EXPORT_SYMBOL(ad7879_pm_ops); | |
14fbbc36 DT |
321 | |
322 | static void ad7879_toggle(struct ad7879 *ts, bool disable) | |
323 | { | |
324 | mutex_lock(&ts->input->mutex); | |
325 | ||
326 | if (!ts->suspended && ts->input->users != 0) { | |
327 | ||
328 | if (disable) { | |
329 | if (ts->disabled) | |
330 | __ad7879_enable(ts); | |
331 | } else { | |
332 | if (!ts->disabled) | |
333 | __ad7879_disable(ts); | |
334 | } | |
b4be468c MH |
335 | } |
336 | ||
14fbbc36 DT |
337 | ts->disabled = disable; |
338 | ||
339 | mutex_unlock(&ts->input->mutex); | |
b4be468c MH |
340 | } |
341 | ||
342 | static ssize_t ad7879_disable_show(struct device *dev, | |
343 | struct device_attribute *attr, char *buf) | |
344 | { | |
345 | struct ad7879 *ts = dev_get_drvdata(dev); | |
346 | ||
347 | return sprintf(buf, "%u\n", ts->disabled); | |
348 | } | |
349 | ||
350 | static ssize_t ad7879_disable_store(struct device *dev, | |
351 | struct device_attribute *attr, | |
352 | const char *buf, size_t count) | |
353 | { | |
354 | struct ad7879 *ts = dev_get_drvdata(dev); | |
76496e7a | 355 | unsigned int val; |
b4be468c MH |
356 | int error; |
357 | ||
76496e7a | 358 | error = kstrtouint(buf, 10, &val); |
b4be468c MH |
359 | if (error) |
360 | return error; | |
361 | ||
14fbbc36 | 362 | ad7879_toggle(ts, val); |
b4be468c MH |
363 | |
364 | return count; | |
365 | } | |
366 | ||
367 | static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store); | |
368 | ||
ec51b7f5 MH |
369 | static struct attribute *ad7879_attributes[] = { |
370 | &dev_attr_disable.attr, | |
371 | NULL | |
372 | }; | |
373 | ||
374 | static const struct attribute_group ad7879_attr_group = { | |
375 | .attrs = ad7879_attributes, | |
376 | }; | |
377 | ||
378 | #ifdef CONFIG_GPIOLIB | |
379 | static int ad7879_gpio_direction_input(struct gpio_chip *chip, | |
380 | unsigned gpio) | |
b4be468c | 381 | { |
d9478044 | 382 | struct ad7879 *ts = gpiochip_get_data(chip); |
ec51b7f5 | 383 | int err; |
b4be468c | 384 | |
ec51b7f5 MH |
385 | mutex_lock(&ts->mutex); |
386 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL; | |
4397c98a | 387 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
ec51b7f5 MH |
388 | mutex_unlock(&ts->mutex); |
389 | ||
390 | return err; | |
b4be468c MH |
391 | } |
392 | ||
ec51b7f5 MH |
393 | static int ad7879_gpio_direction_output(struct gpio_chip *chip, |
394 | unsigned gpio, int level) | |
b4be468c | 395 | { |
d9478044 | 396 | struct ad7879 *ts = gpiochip_get_data(chip); |
ec51b7f5 | 397 | int err; |
b4be468c | 398 | |
ec51b7f5 MH |
399 | mutex_lock(&ts->mutex); |
400 | ts->cmd_crtl2 &= ~AD7879_GPIODIR; | |
401 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL; | |
402 | if (level) | |
403 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; | |
404 | else | |
405 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; | |
406 | ||
4397c98a | 407 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
ec51b7f5 MH |
408 | mutex_unlock(&ts->mutex); |
409 | ||
410 | return err; | |
411 | } | |
412 | ||
413 | static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
414 | { | |
d9478044 | 415 | struct ad7879 *ts = gpiochip_get_data(chip); |
ec51b7f5 | 416 | u16 val; |
b4be468c MH |
417 | |
418 | mutex_lock(&ts->mutex); | |
4397c98a | 419 | val = ad7879_read(ts, AD7879_REG_CTRL2); |
b4be468c MH |
420 | mutex_unlock(&ts->mutex); |
421 | ||
ec51b7f5 | 422 | return !!(val & AD7879_GPIO_DATA); |
b4be468c MH |
423 | } |
424 | ||
ec51b7f5 MH |
425 | static void ad7879_gpio_set_value(struct gpio_chip *chip, |
426 | unsigned gpio, int value) | |
427 | { | |
d9478044 | 428 | struct ad7879 *ts = gpiochip_get_data(chip); |
b4be468c | 429 | |
ec51b7f5 MH |
430 | mutex_lock(&ts->mutex); |
431 | if (value) | |
432 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; | |
433 | else | |
434 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; | |
b4be468c | 435 | |
4397c98a | 436 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
ec51b7f5 MH |
437 | mutex_unlock(&ts->mutex); |
438 | } | |
439 | ||
4397c98a MF |
440 | static int ad7879_gpio_add(struct ad7879 *ts, |
441 | const struct ad7879_platform_data *pdata) | |
ec51b7f5 | 442 | { |
ec51b7f5 MH |
443 | int ret = 0; |
444 | ||
14fbbc36 DT |
445 | mutex_init(&ts->mutex); |
446 | ||
ec51b7f5 MH |
447 | if (pdata->gpio_export) { |
448 | ts->gc.direction_input = ad7879_gpio_direction_input; | |
449 | ts->gc.direction_output = ad7879_gpio_direction_output; | |
450 | ts->gc.get = ad7879_gpio_get_value; | |
451 | ts->gc.set = ad7879_gpio_set_value; | |
452 | ts->gc.can_sleep = 1; | |
453 | ts->gc.base = pdata->gpio_base; | |
454 | ts->gc.ngpio = 1; | |
455 | ts->gc.label = "AD7879-GPIO"; | |
456 | ts->gc.owner = THIS_MODULE; | |
58383c78 | 457 | ts->gc.parent = ts->dev; |
ec51b7f5 | 458 | |
d9478044 | 459 | ret = gpiochip_add_data(&ts->gc, ts); |
ec51b7f5 | 460 | if (ret) |
4397c98a | 461 | dev_err(ts->dev, "failed to register gpio %d\n", |
ec51b7f5 MH |
462 | ts->gc.base); |
463 | } | |
464 | ||
465 | return ret; | |
466 | } | |
467 | ||
4397c98a | 468 | static void ad7879_gpio_remove(struct ad7879 *ts) |
ec51b7f5 | 469 | { |
c838cb3d | 470 | const struct ad7879_platform_data *pdata = dev_get_platdata(ts->dev); |
ec51b7f5 | 471 | |
fa6e3ca2 | 472 | if (pdata && pdata->gpio_export) |
88d5e520 | 473 | gpiochip_remove(&ts->gc); |
474 | ||
ec51b7f5 MH |
475 | } |
476 | #else | |
4397c98a MF |
477 | static inline int ad7879_gpio_add(struct ad7879 *ts, |
478 | const struct ad7879_platform_data *pdata) | |
ec51b7f5 MH |
479 | { |
480 | return 0; | |
481 | } | |
482 | ||
4397c98a | 483 | static inline void ad7879_gpio_remove(struct ad7879 *ts) |
ec51b7f5 MH |
484 | { |
485 | } | |
486 | #endif | |
b4be468c | 487 | |
fa6e3ca2 SA |
488 | static int ad7879_parse_dt(struct device *dev, struct ad7879 *ts) |
489 | { | |
490 | int err; | |
491 | u32 tmp; | |
492 | ||
493 | err = device_property_read_u32(dev, "adi,resistance-plate-x", &tmp); | |
494 | if (err) { | |
495 | dev_err(dev, "failed to get resistance-plate-x property\n"); | |
496 | return err; | |
497 | } | |
498 | ts->x_plate_ohms = (u16)tmp; | |
499 | ||
500 | device_property_read_u8(dev, "adi,first-conversion-delay", | |
501 | &ts->first_conversion_delay); | |
502 | device_property_read_u8(dev, "adi,acquisition-time", | |
503 | &ts->acquisition_time); | |
504 | device_property_read_u8(dev, "adi,median-filter-size", &ts->median); | |
505 | device_property_read_u8(dev, "adi,averaging", &ts->averaging); | |
506 | device_property_read_u8(dev, "adi,conversion-interval", | |
507 | &ts->pen_down_acc_interval); | |
508 | ||
509 | ts->swap_xy = device_property_read_bool(dev, "touchscreen-swapped-x-y"); | |
510 | ||
511 | return 0; | |
512 | } | |
513 | ||
4397c98a MF |
514 | struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq, |
515 | const struct ad7879_bus_ops *bops) | |
b4be468c | 516 | { |
c838cb3d | 517 | struct ad7879_platform_data *pdata = dev_get_platdata(dev); |
4397c98a | 518 | struct ad7879 *ts; |
b4be468c | 519 | struct input_dev *input_dev; |
b4be468c MH |
520 | int err; |
521 | u16 revid; | |
522 | ||
4397c98a | 523 | if (!irq) { |
fa6e3ca2 SA |
524 | dev_err(dev, "No IRQ specified\n"); |
525 | return ERR_PTR(-EINVAL); | |
b4be468c MH |
526 | } |
527 | ||
fa6e3ca2 SA |
528 | ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); |
529 | if (!ts) | |
530 | return ERR_PTR(-ENOMEM); | |
531 | ||
532 | if (pdata) { | |
533 | /* Platform data use swapped axis (backward compatibility) */ | |
534 | ts->swap_xy = !pdata->swap_xy; | |
535 | ||
536 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; | |
537 | ||
538 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
539 | ts->acquisition_time = pdata->acquisition_time; | |
540 | ts->averaging = pdata->averaging; | |
541 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
542 | ts->median = pdata->median; | |
543 | } else if (dev->of_node) { | |
544 | ad7879_parse_dt(dev, ts); | |
545 | } else { | |
546 | dev_err(dev, "No platform data\n"); | |
547 | return ERR_PTR(-EINVAL); | |
b4be468c MH |
548 | } |
549 | ||
fa6e3ca2 SA |
550 | input_dev = devm_input_allocate_device(dev); |
551 | if (!input_dev) { | |
552 | dev_err(dev, "Failed to allocate input device\n"); | |
553 | return ERR_PTR(-ENOMEM); | |
4397c98a | 554 | } |
b4be468c | 555 | |
4397c98a MF |
556 | ts->bops = bops; |
557 | ts->dev = dev; | |
b4be468c | 558 | ts->input = input_dev; |
14fbbc36 | 559 | ts->irq = irq; |
5f2940c4 | 560 | |
b4be468c | 561 | setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts); |
4397c98a | 562 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev)); |
b4be468c MH |
563 | |
564 | input_dev->name = "AD7879 Touchscreen"; | |
565 | input_dev->phys = ts->phys; | |
4397c98a MF |
566 | input_dev->dev.parent = dev; |
567 | input_dev->id.bustype = bops->bustype; | |
b4be468c | 568 | |
14fbbc36 DT |
569 | input_dev->open = ad7879_open; |
570 | input_dev->close = ad7879_close; | |
571 | ||
572 | input_set_drvdata(input_dev, ts); | |
573 | ||
b4be468c MH |
574 | __set_bit(EV_ABS, input_dev->evbit); |
575 | __set_bit(ABS_X, input_dev->absbit); | |
576 | __set_bit(ABS_Y, input_dev->absbit); | |
577 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
578 | ||
963ce8ae MH |
579 | __set_bit(EV_KEY, input_dev->evbit); |
580 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
581 | ||
fa6e3ca2 SA |
582 | if (pdata) { |
583 | input_set_abs_params(input_dev, ABS_X, | |
584 | pdata->x_min ? : 0, | |
585 | pdata->x_max ? : MAX_12BIT, | |
586 | 0, 0); | |
587 | input_set_abs_params(input_dev, ABS_Y, | |
588 | pdata->y_min ? : 0, | |
589 | pdata->y_max ? : MAX_12BIT, | |
590 | 0, 0); | |
591 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
592 | pdata->pressure_min, | |
593 | pdata->pressure_max ? : ~0, | |
594 | 0, 0); | |
595 | } else { | |
596 | input_set_abs_params(input_dev, ABS_X, 0, MAX_12BIT, 0, 0); | |
597 | input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); | |
ed7c9870 | 598 | touchscreen_parse_properties(input_dev, false, NULL); |
fa6e3ca2 SA |
599 | if (!input_abs_get_max(input_dev, ABS_PRESSURE)) { |
600 | dev_err(dev, "Touchscreen pressure is not specified\n"); | |
601 | return ERR_PTR(-EINVAL); | |
602 | } | |
603 | } | |
b4be468c | 604 | |
4397c98a | 605 | err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET); |
b4be468c | 606 | if (err < 0) { |
4397c98a | 607 | dev_err(dev, "Failed to write %s\n", input_dev->name); |
fa6e3ca2 | 608 | return ERR_PTR(err); |
b4be468c MH |
609 | } |
610 | ||
4397c98a MF |
611 | revid = ad7879_read(ts, AD7879_REG_REVID); |
612 | input_dev->id.product = (revid & 0xff); | |
613 | input_dev->id.version = revid >> 8; | |
614 | if (input_dev->id.product != devid) { | |
615 | dev_err(dev, "Failed to probe %s (%x vs %x)\n", | |
616 | input_dev->name, devid, revid); | |
fa6e3ca2 | 617 | return ERR_PTR(-ENODEV); |
b4be468c MH |
618 | } |
619 | ||
ec51b7f5 MH |
620 | ts->cmd_crtl3 = AD7879_YPLUS_BIT | |
621 | AD7879_XPLUS_BIT | | |
622 | AD7879_Z2_BIT | | |
623 | AD7879_Z1_BIT | | |
624 | AD7879_TEMPMASK_BIT | | |
625 | AD7879_AUXVBATMASK_BIT | | |
626 | AD7879_GPIOALERTMASK_BIT; | |
627 | ||
628 | ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR | | |
629 | AD7879_AVG(ts->averaging) | | |
630 | AD7879_MFS(ts->median) | | |
631 | AD7879_FCD(ts->first_conversion_delay); | |
632 | ||
633 | ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 | | |
634 | AD7879_ACQ(ts->acquisition_time) | | |
635 | AD7879_TMR(ts->pen_down_acc_interval); | |
636 | ||
fa6e3ca2 SA |
637 | err = devm_request_threaded_irq(dev, ts->irq, NULL, ad7879_irq, |
638 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
639 | dev_name(dev), ts); | |
b4be468c | 640 | if (err) { |
fa6e3ca2 SA |
641 | dev_err(dev, "Failed to request IRQ: %d\n", err); |
642 | return ERR_PTR(err); | |
b4be468c MH |
643 | } |
644 | ||
14fbbc36 DT |
645 | __ad7879_disable(ts); |
646 | ||
4397c98a | 647 | err = sysfs_create_group(&dev->kobj, &ad7879_attr_group); |
b4be468c | 648 | if (err) |
fa6e3ca2 | 649 | goto err_out; |
b4be468c | 650 | |
fa6e3ca2 SA |
651 | if (pdata) { |
652 | err = ad7879_gpio_add(ts, pdata); | |
653 | if (err) | |
654 | goto err_remove_attr; | |
655 | } | |
b4be468c | 656 | |
ec51b7f5 MH |
657 | err = input_register_device(input_dev); |
658 | if (err) | |
659 | goto err_remove_gpio; | |
660 | ||
4397c98a | 661 | return ts; |
b4be468c | 662 | |
ec51b7f5 | 663 | err_remove_gpio: |
4397c98a | 664 | ad7879_gpio_remove(ts); |
b4be468c | 665 | err_remove_attr: |
4397c98a | 666 | sysfs_remove_group(&dev->kobj, &ad7879_attr_group); |
4397c98a MF |
667 | err_out: |
668 | return ERR_PTR(err); | |
b4be468c | 669 | } |
4397c98a | 670 | EXPORT_SYMBOL(ad7879_probe); |
b4be468c | 671 | |
4397c98a | 672 | void ad7879_remove(struct ad7879 *ts) |
b4be468c | 673 | { |
4397c98a | 674 | ad7879_gpio_remove(ts); |
4397c98a | 675 | sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group); |
b4be468c | 676 | } |
4397c98a | 677 | EXPORT_SYMBOL(ad7879_remove); |
b4be468c MH |
678 | |
679 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
680 | MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver"); | |
681 | MODULE_LICENSE("GPL"); |