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 MH |
33 | |
34 | #include <linux/spi/ad7879.h> | |
d2d8442d | 35 | #include <linux/module.h> |
4397c98a | 36 | #include "ad7879.h" |
b4be468c MH |
37 | |
38 | #define AD7879_REG_ZEROS 0 | |
39 | #define AD7879_REG_CTRL1 1 | |
40 | #define AD7879_REG_CTRL2 2 | |
41 | #define AD7879_REG_CTRL3 3 | |
42 | #define AD7879_REG_AUX1HIGH 4 | |
43 | #define AD7879_REG_AUX1LOW 5 | |
44 | #define AD7879_REG_TEMP1HIGH 6 | |
45 | #define AD7879_REG_TEMP1LOW 7 | |
46 | #define AD7879_REG_XPLUS 8 | |
47 | #define AD7879_REG_YPLUS 9 | |
48 | #define AD7879_REG_Z1 10 | |
49 | #define AD7879_REG_Z2 11 | |
50 | #define AD7879_REG_AUXVBAT 12 | |
51 | #define AD7879_REG_TEMP 13 | |
52 | #define AD7879_REG_REVID 14 | |
53 | ||
54 | /* Control REG 1 */ | |
55 | #define AD7879_TMR(x) ((x & 0xFF) << 0) | |
56 | #define AD7879_ACQ(x) ((x & 0x3) << 8) | |
57 | #define AD7879_MODE_NOC (0 << 10) /* Do not convert */ | |
58 | #define AD7879_MODE_SCC (1 << 10) /* Single channel conversion */ | |
59 | #define AD7879_MODE_SEQ0 (2 << 10) /* Sequence 0 in Slave Mode */ | |
60 | #define AD7879_MODE_SEQ1 (3 << 10) /* Sequence 1 in Master Mode */ | |
61 | #define AD7879_MODE_INT (1 << 15) /* PENIRQ disabled INT enabled */ | |
62 | ||
63 | /* Control REG 2 */ | |
64 | #define AD7879_FCD(x) ((x & 0x3) << 0) | |
65 | #define AD7879_RESET (1 << 4) | |
66 | #define AD7879_MFS(x) ((x & 0x3) << 5) | |
67 | #define AD7879_AVG(x) ((x & 0x3) << 7) | |
68 | #define AD7879_SER (1 << 9) /* non-differential */ | |
69 | #define AD7879_DFR (0 << 9) /* differential */ | |
70 | #define AD7879_GPIOPOL (1 << 10) | |
71 | #define AD7879_GPIODIR (1 << 11) | |
72 | #define AD7879_GPIO_DATA (1 << 12) | |
73 | #define AD7879_GPIO_EN (1 << 13) | |
74 | #define AD7879_PM(x) ((x & 0x3) << 14) | |
75 | #define AD7879_PM_SHUTDOWN (0) | |
76 | #define AD7879_PM_DYN (1) | |
77 | #define AD7879_PM_FULLON (2) | |
78 | ||
79 | /* Control REG 3 */ | |
80 | #define AD7879_TEMPMASK_BIT (1<<15) | |
81 | #define AD7879_AUXVBATMASK_BIT (1<<14) | |
82 | #define AD7879_INTMODE_BIT (1<<13) | |
83 | #define AD7879_GPIOALERTMASK_BIT (1<<12) | |
84 | #define AD7879_AUXLOW_BIT (1<<11) | |
85 | #define AD7879_AUXHIGH_BIT (1<<10) | |
86 | #define AD7879_TEMPLOW_BIT (1<<9) | |
87 | #define AD7879_TEMPHIGH_BIT (1<<8) | |
88 | #define AD7879_YPLUS_BIT (1<<7) | |
89 | #define AD7879_XPLUS_BIT (1<<6) | |
90 | #define AD7879_Z1_BIT (1<<5) | |
91 | #define AD7879_Z2_BIT (1<<4) | |
92 | #define AD7879_AUX_BIT (1<<3) | |
93 | #define AD7879_VBAT_BIT (1<<2) | |
94 | #define AD7879_TEMP_BIT (1<<1) | |
95 | ||
96 | enum { | |
97 | AD7879_SEQ_XPOS = 0, | |
98 | AD7879_SEQ_YPOS = 1, | |
99 | AD7879_SEQ_Z1 = 2, | |
100 | AD7879_SEQ_Z2 = 3, | |
101 | AD7879_NR_SENSE = 4, | |
102 | }; | |
103 | ||
104 | #define MAX_12BIT ((1<<12)-1) | |
105 | #define TS_PEN_UP_TIMEOUT msecs_to_jiffies(50) | |
106 | ||
b4be468c | 107 | struct ad7879 { |
4397c98a MF |
108 | const struct ad7879_bus_ops *bops; |
109 | ||
110 | struct device *dev; | |
b4be468c | 111 | struct input_dev *input; |
b4be468c | 112 | struct timer_list timer; |
ec51b7f5 MH |
113 | #ifdef CONFIG_GPIOLIB |
114 | struct gpio_chip gc; | |
14fbbc36 | 115 | struct mutex mutex; |
ec51b7f5 | 116 | #endif |
4397c98a | 117 | unsigned int irq; |
14fbbc36 DT |
118 | bool disabled; /* P: input->mutex */ |
119 | bool suspended; /* P: input->mutex */ | |
6680884a | 120 | bool swap_xy; |
b4be468c MH |
121 | 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; | |
129 | u16 pressure_max; | |
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 | |
173 | * programmable. (dev.platform_data, see linux/spi/ad7879.h) Other | |
174 | * user-programmable conversion controls include variable acquisition | |
175 | * time, and first conversion delay. Up to 16 averages can be taken | |
176 | * 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 | */ | |
189 | if (Rt > ts->pressure_max) | |
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 | ||
8672bd93 DT |
287 | #ifdef CONFIG_PM_SLEEP |
288 | static int ad7879_suspend(struct device *dev) | |
14fbbc36 | 289 | { |
8672bd93 DT |
290 | struct ad7879 *ts = dev_get_drvdata(dev); |
291 | ||
14fbbc36 DT |
292 | mutex_lock(&ts->input->mutex); |
293 | ||
294 | if (!ts->suspended && !ts->disabled && ts->input->users) | |
295 | __ad7879_disable(ts); | |
296 | ||
297 | ts->suspended = true; | |
298 | ||
299 | mutex_unlock(&ts->input->mutex); | |
8672bd93 DT |
300 | |
301 | return 0; | |
14fbbc36 | 302 | } |
14fbbc36 | 303 | |
8672bd93 | 304 | static int ad7879_resume(struct device *dev) |
14fbbc36 | 305 | { |
8672bd93 DT |
306 | struct ad7879 *ts = dev_get_drvdata(dev); |
307 | ||
14fbbc36 | 308 | mutex_lock(&ts->input->mutex); |
b4be468c | 309 | |
14fbbc36 DT |
310 | if (ts->suspended && !ts->disabled && ts->input->users) |
311 | __ad7879_enable(ts); | |
312 | ||
313 | ts->suspended = false; | |
314 | ||
315 | mutex_unlock(&ts->input->mutex); | |
8672bd93 DT |
316 | |
317 | return 0; | |
14fbbc36 | 318 | } |
8672bd93 DT |
319 | #endif |
320 | ||
321 | SIMPLE_DEV_PM_OPS(ad7879_pm_ops, ad7879_suspend, ad7879_resume); | |
322 | EXPORT_SYMBOL(ad7879_pm_ops); | |
14fbbc36 DT |
323 | |
324 | static void ad7879_toggle(struct ad7879 *ts, bool disable) | |
325 | { | |
326 | mutex_lock(&ts->input->mutex); | |
327 | ||
328 | if (!ts->suspended && ts->input->users != 0) { | |
329 | ||
330 | if (disable) { | |
331 | if (ts->disabled) | |
332 | __ad7879_enable(ts); | |
333 | } else { | |
334 | if (!ts->disabled) | |
335 | __ad7879_disable(ts); | |
336 | } | |
b4be468c MH |
337 | } |
338 | ||
14fbbc36 DT |
339 | ts->disabled = disable; |
340 | ||
341 | mutex_unlock(&ts->input->mutex); | |
b4be468c MH |
342 | } |
343 | ||
344 | static ssize_t ad7879_disable_show(struct device *dev, | |
345 | struct device_attribute *attr, char *buf) | |
346 | { | |
347 | struct ad7879 *ts = dev_get_drvdata(dev); | |
348 | ||
349 | return sprintf(buf, "%u\n", ts->disabled); | |
350 | } | |
351 | ||
352 | static ssize_t ad7879_disable_store(struct device *dev, | |
353 | struct device_attribute *attr, | |
354 | const char *buf, size_t count) | |
355 | { | |
356 | struct ad7879 *ts = dev_get_drvdata(dev); | |
76496e7a | 357 | unsigned int val; |
b4be468c MH |
358 | int error; |
359 | ||
76496e7a | 360 | error = kstrtouint(buf, 10, &val); |
b4be468c MH |
361 | if (error) |
362 | return error; | |
363 | ||
14fbbc36 | 364 | ad7879_toggle(ts, val); |
b4be468c MH |
365 | |
366 | return count; | |
367 | } | |
368 | ||
369 | static DEVICE_ATTR(disable, 0664, ad7879_disable_show, ad7879_disable_store); | |
370 | ||
ec51b7f5 MH |
371 | static struct attribute *ad7879_attributes[] = { |
372 | &dev_attr_disable.attr, | |
373 | NULL | |
374 | }; | |
375 | ||
376 | static const struct attribute_group ad7879_attr_group = { | |
377 | .attrs = ad7879_attributes, | |
378 | }; | |
379 | ||
380 | #ifdef CONFIG_GPIOLIB | |
381 | static int ad7879_gpio_direction_input(struct gpio_chip *chip, | |
382 | unsigned gpio) | |
b4be468c | 383 | { |
ec51b7f5 MH |
384 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); |
385 | int err; | |
b4be468c | 386 | |
ec51b7f5 MH |
387 | mutex_lock(&ts->mutex); |
388 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIODIR | AD7879_GPIOPOL; | |
4397c98a | 389 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
ec51b7f5 MH |
390 | mutex_unlock(&ts->mutex); |
391 | ||
392 | return err; | |
b4be468c MH |
393 | } |
394 | ||
ec51b7f5 MH |
395 | static int ad7879_gpio_direction_output(struct gpio_chip *chip, |
396 | unsigned gpio, int level) | |
b4be468c | 397 | { |
ec51b7f5 MH |
398 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); |
399 | int err; | |
b4be468c | 400 | |
ec51b7f5 MH |
401 | mutex_lock(&ts->mutex); |
402 | ts->cmd_crtl2 &= ~AD7879_GPIODIR; | |
403 | ts->cmd_crtl2 |= AD7879_GPIO_EN | AD7879_GPIOPOL; | |
404 | if (level) | |
405 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; | |
406 | else | |
407 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; | |
408 | ||
4397c98a | 409 | err = ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
ec51b7f5 MH |
410 | mutex_unlock(&ts->mutex); |
411 | ||
412 | return err; | |
413 | } | |
414 | ||
415 | static int ad7879_gpio_get_value(struct gpio_chip *chip, unsigned gpio) | |
416 | { | |
417 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); | |
418 | u16 val; | |
b4be468c MH |
419 | |
420 | mutex_lock(&ts->mutex); | |
4397c98a | 421 | val = ad7879_read(ts, AD7879_REG_CTRL2); |
b4be468c MH |
422 | mutex_unlock(&ts->mutex); |
423 | ||
ec51b7f5 | 424 | return !!(val & AD7879_GPIO_DATA); |
b4be468c MH |
425 | } |
426 | ||
ec51b7f5 MH |
427 | static void ad7879_gpio_set_value(struct gpio_chip *chip, |
428 | unsigned gpio, int value) | |
429 | { | |
430 | struct ad7879 *ts = container_of(chip, struct ad7879, gc); | |
b4be468c | 431 | |
ec51b7f5 MH |
432 | mutex_lock(&ts->mutex); |
433 | if (value) | |
434 | ts->cmd_crtl2 |= AD7879_GPIO_DATA; | |
435 | else | |
436 | ts->cmd_crtl2 &= ~AD7879_GPIO_DATA; | |
b4be468c | 437 | |
4397c98a | 438 | ad7879_write(ts, AD7879_REG_CTRL2, ts->cmd_crtl2); |
ec51b7f5 MH |
439 | mutex_unlock(&ts->mutex); |
440 | } | |
441 | ||
4397c98a MF |
442 | static int ad7879_gpio_add(struct ad7879 *ts, |
443 | const struct ad7879_platform_data *pdata) | |
ec51b7f5 | 444 | { |
ec51b7f5 MH |
445 | int ret = 0; |
446 | ||
14fbbc36 DT |
447 | mutex_init(&ts->mutex); |
448 | ||
ec51b7f5 MH |
449 | if (pdata->gpio_export) { |
450 | ts->gc.direction_input = ad7879_gpio_direction_input; | |
451 | ts->gc.direction_output = ad7879_gpio_direction_output; | |
452 | ts->gc.get = ad7879_gpio_get_value; | |
453 | ts->gc.set = ad7879_gpio_set_value; | |
454 | ts->gc.can_sleep = 1; | |
455 | ts->gc.base = pdata->gpio_base; | |
456 | ts->gc.ngpio = 1; | |
457 | ts->gc.label = "AD7879-GPIO"; | |
458 | ts->gc.owner = THIS_MODULE; | |
4397c98a | 459 | ts->gc.dev = ts->dev; |
ec51b7f5 MH |
460 | |
461 | ret = gpiochip_add(&ts->gc); | |
462 | if (ret) | |
4397c98a | 463 | dev_err(ts->dev, "failed to register gpio %d\n", |
ec51b7f5 MH |
464 | ts->gc.base); |
465 | } | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
4397c98a | 470 | static void ad7879_gpio_remove(struct ad7879 *ts) |
ec51b7f5 | 471 | { |
c838cb3d | 472 | const struct ad7879_platform_data *pdata = dev_get_platdata(ts->dev); |
ec51b7f5 | 473 | |
88d5e520 | 474 | if (pdata->gpio_export) |
475 | gpiochip_remove(&ts->gc); | |
476 | ||
ec51b7f5 MH |
477 | } |
478 | #else | |
4397c98a MF |
479 | static inline int ad7879_gpio_add(struct ad7879 *ts, |
480 | const struct ad7879_platform_data *pdata) | |
ec51b7f5 MH |
481 | { |
482 | return 0; | |
483 | } | |
484 | ||
4397c98a | 485 | static inline void ad7879_gpio_remove(struct ad7879 *ts) |
ec51b7f5 MH |
486 | { |
487 | } | |
488 | #endif | |
b4be468c | 489 | |
4397c98a MF |
490 | struct ad7879 *ad7879_probe(struct device *dev, u8 devid, unsigned int irq, |
491 | const struct ad7879_bus_ops *bops) | |
b4be468c | 492 | { |
c838cb3d | 493 | struct ad7879_platform_data *pdata = dev_get_platdata(dev); |
4397c98a | 494 | struct ad7879 *ts; |
b4be468c | 495 | struct input_dev *input_dev; |
b4be468c MH |
496 | int err; |
497 | u16 revid; | |
498 | ||
4397c98a MF |
499 | if (!irq) { |
500 | dev_err(dev, "no IRQ?\n"); | |
501 | err = -EINVAL; | |
502 | goto err_out; | |
b4be468c MH |
503 | } |
504 | ||
505 | if (!pdata) { | |
4397c98a MF |
506 | dev_err(dev, "no platform data?\n"); |
507 | err = -EINVAL; | |
508 | goto err_out; | |
b4be468c MH |
509 | } |
510 | ||
4397c98a | 511 | ts = kzalloc(sizeof(*ts), GFP_KERNEL); |
b4be468c | 512 | input_dev = input_allocate_device(); |
4397c98a MF |
513 | if (!ts || !input_dev) { |
514 | err = -ENOMEM; | |
515 | goto err_free_mem; | |
516 | } | |
b4be468c | 517 | |
4397c98a MF |
518 | ts->bops = bops; |
519 | ts->dev = dev; | |
b4be468c | 520 | ts->input = input_dev; |
14fbbc36 | 521 | ts->irq = irq; |
6680884a | 522 | ts->swap_xy = pdata->swap_xy; |
b4be468c MH |
523 | |
524 | setup_timer(&ts->timer, ad7879_timer, (unsigned long) ts); | |
4397c98a | 525 | |
b4be468c MH |
526 | ts->x_plate_ohms = pdata->x_plate_ohms ? : 400; |
527 | ts->pressure_max = pdata->pressure_max ? : ~0; | |
528 | ||
529 | ts->first_conversion_delay = pdata->first_conversion_delay; | |
530 | ts->acquisition_time = pdata->acquisition_time; | |
531 | ts->averaging = pdata->averaging; | |
532 | ts->pen_down_acc_interval = pdata->pen_down_acc_interval; | |
533 | ts->median = pdata->median; | |
534 | ||
4397c98a | 535 | snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev)); |
b4be468c MH |
536 | |
537 | input_dev->name = "AD7879 Touchscreen"; | |
538 | input_dev->phys = ts->phys; | |
4397c98a MF |
539 | input_dev->dev.parent = dev; |
540 | input_dev->id.bustype = bops->bustype; | |
b4be468c | 541 | |
14fbbc36 DT |
542 | input_dev->open = ad7879_open; |
543 | input_dev->close = ad7879_close; | |
544 | ||
545 | input_set_drvdata(input_dev, ts); | |
546 | ||
b4be468c MH |
547 | __set_bit(EV_ABS, input_dev->evbit); |
548 | __set_bit(ABS_X, input_dev->absbit); | |
549 | __set_bit(ABS_Y, input_dev->absbit); | |
550 | __set_bit(ABS_PRESSURE, input_dev->absbit); | |
551 | ||
963ce8ae MH |
552 | __set_bit(EV_KEY, input_dev->evbit); |
553 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
554 | ||
b4be468c MH |
555 | input_set_abs_params(input_dev, ABS_X, |
556 | pdata->x_min ? : 0, | |
557 | pdata->x_max ? : MAX_12BIT, | |
558 | 0, 0); | |
559 | input_set_abs_params(input_dev, ABS_Y, | |
560 | pdata->y_min ? : 0, | |
561 | pdata->y_max ? : MAX_12BIT, | |
562 | 0, 0); | |
563 | input_set_abs_params(input_dev, ABS_PRESSURE, | |
564 | pdata->pressure_min, pdata->pressure_max, 0, 0); | |
565 | ||
4397c98a | 566 | err = ad7879_write(ts, AD7879_REG_CTRL2, AD7879_RESET); |
b4be468c | 567 | if (err < 0) { |
4397c98a | 568 | dev_err(dev, "Failed to write %s\n", input_dev->name); |
b4be468c MH |
569 | goto err_free_mem; |
570 | } | |
571 | ||
4397c98a MF |
572 | revid = ad7879_read(ts, AD7879_REG_REVID); |
573 | input_dev->id.product = (revid & 0xff); | |
574 | input_dev->id.version = revid >> 8; | |
575 | if (input_dev->id.product != devid) { | |
576 | dev_err(dev, "Failed to probe %s (%x vs %x)\n", | |
577 | input_dev->name, devid, revid); | |
b4be468c MH |
578 | err = -ENODEV; |
579 | goto err_free_mem; | |
580 | } | |
581 | ||
ec51b7f5 MH |
582 | ts->cmd_crtl3 = AD7879_YPLUS_BIT | |
583 | AD7879_XPLUS_BIT | | |
584 | AD7879_Z2_BIT | | |
585 | AD7879_Z1_BIT | | |
586 | AD7879_TEMPMASK_BIT | | |
587 | AD7879_AUXVBATMASK_BIT | | |
588 | AD7879_GPIOALERTMASK_BIT; | |
589 | ||
590 | ts->cmd_crtl2 = AD7879_PM(AD7879_PM_DYN) | AD7879_DFR | | |
591 | AD7879_AVG(ts->averaging) | | |
592 | AD7879_MFS(ts->median) | | |
593 | AD7879_FCD(ts->first_conversion_delay); | |
594 | ||
595 | ts->cmd_crtl1 = AD7879_MODE_INT | AD7879_MODE_SEQ1 | | |
596 | AD7879_ACQ(ts->acquisition_time) | | |
597 | AD7879_TMR(ts->pen_down_acc_interval); | |
598 | ||
4397c98a | 599 | err = request_threaded_irq(ts->irq, NULL, ad7879_irq, |
9b7e31bb | 600 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
4397c98a | 601 | dev_name(dev), ts); |
b4be468c | 602 | if (err) { |
4397c98a | 603 | dev_err(dev, "irq %d busy?\n", ts->irq); |
b4be468c MH |
604 | goto err_free_mem; |
605 | } | |
606 | ||
14fbbc36 DT |
607 | __ad7879_disable(ts); |
608 | ||
4397c98a | 609 | err = sysfs_create_group(&dev->kobj, &ad7879_attr_group); |
b4be468c MH |
610 | if (err) |
611 | goto err_free_irq; | |
612 | ||
4397c98a | 613 | err = ad7879_gpio_add(ts, pdata); |
b4be468c MH |
614 | if (err) |
615 | goto err_remove_attr; | |
616 | ||
ec51b7f5 MH |
617 | err = input_register_device(input_dev); |
618 | if (err) | |
619 | goto err_remove_gpio; | |
620 | ||
4397c98a | 621 | return ts; |
b4be468c | 622 | |
ec51b7f5 | 623 | err_remove_gpio: |
4397c98a | 624 | ad7879_gpio_remove(ts); |
b4be468c | 625 | err_remove_attr: |
4397c98a | 626 | sysfs_remove_group(&dev->kobj, &ad7879_attr_group); |
b4be468c | 627 | err_free_irq: |
4397c98a | 628 | free_irq(ts->irq, ts); |
b4be468c MH |
629 | err_free_mem: |
630 | input_free_device(input_dev); | |
4397c98a MF |
631 | kfree(ts); |
632 | err_out: | |
633 | return ERR_PTR(err); | |
b4be468c | 634 | } |
4397c98a | 635 | EXPORT_SYMBOL(ad7879_probe); |
b4be468c | 636 | |
4397c98a | 637 | void ad7879_remove(struct ad7879 *ts) |
b4be468c | 638 | { |
4397c98a | 639 | ad7879_gpio_remove(ts); |
4397c98a MF |
640 | sysfs_remove_group(&ts->dev->kobj, &ad7879_attr_group); |
641 | free_irq(ts->irq, ts); | |
b4be468c | 642 | input_unregister_device(ts->input); |
b4be468c | 643 | kfree(ts); |
b4be468c | 644 | } |
4397c98a | 645 | EXPORT_SYMBOL(ad7879_remove); |
b4be468c MH |
646 | |
647 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
648 | MODULE_DESCRIPTION("AD7879(-1) touchscreen Driver"); | |
649 | MODULE_LICENSE("GPL"); |