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4780c8df NKG |
1 | /* |
2 | * Copyright (C) ST-Ericsson SA 2010 | |
3 | * Author: Naveen Kumar G <naveen.gaddipati@stericsson.com> for ST-Ericsson | |
4 | * License terms:GNU General Public License (GPL) version 2 | |
5 | */ | |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/delay.h> | |
9 | #include <linux/interrupt.h> | |
10 | #include <linux/i2c.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/input.h> | |
13 | #include <linux/input/bu21013.h> | |
14 | #include <linux/slab.h> | |
81e78dea | 15 | #include <linux/regulator/consumer.h> |
d2d8442d | 16 | #include <linux/module.h> |
31fbcda7 | 17 | #include <linux/gpio.h> |
48fceb7d LJ |
18 | #include <linux/of.h> |
19 | #include <linux/of_gpio.h> | |
4780c8df NKG |
20 | |
21 | #define PEN_DOWN_INTR 0 | |
22 | #define MAX_FINGERS 2 | |
23 | #define RESET_DELAY 30 | |
24 | #define PENUP_TIMEOUT (10) | |
25 | #define DELTA_MIN 16 | |
26 | #define MASK_BITS 0x03 | |
27 | #define SHIFT_8 8 | |
28 | #define SHIFT_2 2 | |
29 | #define LENGTH_OF_BUFFER 11 | |
30 | #define I2C_RETRY_COUNT 5 | |
31 | ||
32 | #define BU21013_SENSORS_BTN_0_7_REG 0x70 | |
33 | #define BU21013_SENSORS_BTN_8_15_REG 0x71 | |
34 | #define BU21013_SENSORS_BTN_16_23_REG 0x72 | |
35 | #define BU21013_X1_POS_MSB_REG 0x73 | |
36 | #define BU21013_X1_POS_LSB_REG 0x74 | |
37 | #define BU21013_Y1_POS_MSB_REG 0x75 | |
38 | #define BU21013_Y1_POS_LSB_REG 0x76 | |
39 | #define BU21013_X2_POS_MSB_REG 0x77 | |
40 | #define BU21013_X2_POS_LSB_REG 0x78 | |
41 | #define BU21013_Y2_POS_MSB_REG 0x79 | |
42 | #define BU21013_Y2_POS_LSB_REG 0x7A | |
43 | #define BU21013_INT_CLR_REG 0xE8 | |
44 | #define BU21013_INT_MODE_REG 0xE9 | |
45 | #define BU21013_GAIN_REG 0xEA | |
46 | #define BU21013_OFFSET_MODE_REG 0xEB | |
47 | #define BU21013_XY_EDGE_REG 0xEC | |
48 | #define BU21013_RESET_REG 0xED | |
49 | #define BU21013_CALIB_REG 0xEE | |
50 | #define BU21013_DONE_REG 0xEF | |
51 | #define BU21013_SENSOR_0_7_REG 0xF0 | |
52 | #define BU21013_SENSOR_8_15_REG 0xF1 | |
53 | #define BU21013_SENSOR_16_23_REG 0xF2 | |
54 | #define BU21013_POS_MODE1_REG 0xF3 | |
55 | #define BU21013_POS_MODE2_REG 0xF4 | |
56 | #define BU21013_CLK_MODE_REG 0xF5 | |
57 | #define BU21013_IDLE_REG 0xFA | |
58 | #define BU21013_FILTER_REG 0xFB | |
59 | #define BU21013_TH_ON_REG 0xFC | |
60 | #define BU21013_TH_OFF_REG 0xFD | |
61 | ||
62 | ||
63 | #define BU21013_RESET_ENABLE 0x01 | |
64 | ||
65 | #define BU21013_SENSORS_EN_0_7 0x3F | |
66 | #define BU21013_SENSORS_EN_8_15 0xFC | |
67 | #define BU21013_SENSORS_EN_16_23 0x1F | |
68 | ||
69 | #define BU21013_POS_MODE1_0 0x02 | |
70 | #define BU21013_POS_MODE1_1 0x04 | |
71 | #define BU21013_POS_MODE1_2 0x08 | |
72 | ||
73 | #define BU21013_POS_MODE2_ZERO 0x01 | |
74 | #define BU21013_POS_MODE2_AVG1 0x02 | |
75 | #define BU21013_POS_MODE2_AVG2 0x04 | |
76 | #define BU21013_POS_MODE2_EN_XY 0x08 | |
77 | #define BU21013_POS_MODE2_EN_RAW 0x10 | |
78 | #define BU21013_POS_MODE2_MULTI 0x80 | |
79 | ||
80 | #define BU21013_CLK_MODE_DIV 0x01 | |
81 | #define BU21013_CLK_MODE_EXT 0x02 | |
82 | #define BU21013_CLK_MODE_CALIB 0x80 | |
83 | ||
84 | #define BU21013_IDLET_0 0x01 | |
85 | #define BU21013_IDLET_1 0x02 | |
86 | #define BU21013_IDLET_2 0x04 | |
87 | #define BU21013_IDLET_3 0x08 | |
88 | #define BU21013_IDLE_INTERMIT_EN 0x10 | |
89 | ||
90 | #define BU21013_DELTA_0_6 0x7F | |
91 | #define BU21013_FILTER_EN 0x80 | |
92 | ||
93 | #define BU21013_INT_MODE_LEVEL 0x00 | |
94 | #define BU21013_INT_MODE_EDGE 0x01 | |
95 | ||
96 | #define BU21013_GAIN_0 0x01 | |
97 | #define BU21013_GAIN_1 0x02 | |
98 | #define BU21013_GAIN_2 0x04 | |
99 | ||
100 | #define BU21013_OFFSET_MODE_DEFAULT 0x00 | |
101 | #define BU21013_OFFSET_MODE_MOVE 0x01 | |
102 | #define BU21013_OFFSET_MODE_DISABLE 0x02 | |
103 | ||
104 | #define BU21013_TH_ON_0 0x01 | |
105 | #define BU21013_TH_ON_1 0x02 | |
106 | #define BU21013_TH_ON_2 0x04 | |
107 | #define BU21013_TH_ON_3 0x08 | |
108 | #define BU21013_TH_ON_4 0x10 | |
109 | #define BU21013_TH_ON_5 0x20 | |
110 | #define BU21013_TH_ON_6 0x40 | |
111 | #define BU21013_TH_ON_7 0x80 | |
112 | #define BU21013_TH_ON_MAX 0xFF | |
113 | ||
114 | #define BU21013_TH_OFF_0 0x01 | |
115 | #define BU21013_TH_OFF_1 0x02 | |
116 | #define BU21013_TH_OFF_2 0x04 | |
117 | #define BU21013_TH_OFF_3 0x08 | |
118 | #define BU21013_TH_OFF_4 0x10 | |
119 | #define BU21013_TH_OFF_5 0x20 | |
120 | #define BU21013_TH_OFF_6 0x40 | |
121 | #define BU21013_TH_OFF_7 0x80 | |
122 | #define BU21013_TH_OFF_MAX 0xFF | |
123 | ||
124 | #define BU21013_X_EDGE_0 0x01 | |
125 | #define BU21013_X_EDGE_1 0x02 | |
126 | #define BU21013_X_EDGE_2 0x04 | |
127 | #define BU21013_X_EDGE_3 0x08 | |
128 | #define BU21013_Y_EDGE_0 0x10 | |
129 | #define BU21013_Y_EDGE_1 0x20 | |
130 | #define BU21013_Y_EDGE_2 0x40 | |
131 | #define BU21013_Y_EDGE_3 0x80 | |
132 | ||
133 | #define BU21013_DONE 0x01 | |
134 | #define BU21013_NUMBER_OF_X_SENSORS (6) | |
135 | #define BU21013_NUMBER_OF_Y_SENSORS (11) | |
136 | ||
137 | #define DRIVER_TP "bu21013_tp" | |
138 | ||
139 | /** | |
140 | * struct bu21013_ts_data - touch panel data structure | |
141 | * @client: pointer to the i2c client | |
142 | * @wait: variable to wait_queue_head_t structure | |
143 | * @touch_stopped: touch stop flag | |
144 | * @chip: pointer to the touch panel controller | |
145 | * @in_dev: pointer to the input device structure | |
146 | * @intr_pin: interrupt pin value | |
81e78dea | 147 | * @regulator: pointer to the Regulator used for touch screen |
4780c8df NKG |
148 | * |
149 | * Touch panel device data structure | |
150 | */ | |
151 | struct bu21013_ts_data { | |
152 | struct i2c_client *client; | |
153 | wait_queue_head_t wait; | |
4780c8df NKG |
154 | const struct bu21013_platform_device *chip; |
155 | struct input_dev *in_dev; | |
81e78dea | 156 | struct regulator *regulator; |
31fbcda7 LJ |
157 | unsigned int irq; |
158 | unsigned int intr_pin; | |
159 | bool touch_stopped; | |
4780c8df NKG |
160 | }; |
161 | ||
162 | /** | |
163 | * bu21013_read_block_data(): read the touch co-ordinates | |
164 | * @data: bu21013_ts_data structure pointer | |
165 | * @buf: byte pointer | |
166 | * | |
167 | * Read the touch co-ordinates using i2c read block into buffer | |
168 | * and returns integer. | |
169 | */ | |
170 | static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf) | |
171 | { | |
172 | int ret, i; | |
173 | ||
174 | for (i = 0; i < I2C_RETRY_COUNT; i++) { | |
175 | ret = i2c_smbus_read_i2c_block_data | |
176 | (data->client, BU21013_SENSORS_BTN_0_7_REG, | |
177 | LENGTH_OF_BUFFER, buf); | |
178 | if (ret == LENGTH_OF_BUFFER) | |
179 | return 0; | |
180 | } | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
184 | /** | |
185 | * bu21013_do_touch_report(): Get the touch co-ordinates | |
186 | * @data: bu21013_ts_data structure pointer | |
187 | * | |
188 | * Get the touch co-ordinates from touch sensor registers and writes | |
189 | * into device structure and returns integer. | |
190 | */ | |
191 | static int bu21013_do_touch_report(struct bu21013_ts_data *data) | |
192 | { | |
193 | u8 buf[LENGTH_OF_BUFFER]; | |
194 | unsigned int pos_x[2], pos_y[2]; | |
195 | bool has_x_sensors, has_y_sensors; | |
196 | int finger_down_count = 0; | |
197 | int i; | |
198 | ||
199 | if (data == NULL) | |
200 | return -EINVAL; | |
201 | ||
202 | if (bu21013_read_block_data(data, buf) < 0) | |
203 | return -EINVAL; | |
204 | ||
205 | has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7); | |
206 | has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) | | |
207 | ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2); | |
208 | if (!has_x_sensors || !has_y_sensors) | |
209 | return 0; | |
210 | ||
211 | for (i = 0; i < MAX_FINGERS; i++) { | |
212 | const u8 *p = &buf[4 * i + 3]; | |
213 | unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS); | |
214 | unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS); | |
215 | if (x == 0 || y == 0) | |
216 | continue; | |
217 | pos_x[finger_down_count] = x; | |
218 | pos_y[finger_down_count] = y; | |
219 | finger_down_count++; | |
220 | } | |
221 | ||
222 | if (finger_down_count) { | |
223 | if (finger_down_count == 2 && | |
224 | (abs(pos_x[0] - pos_x[1]) < DELTA_MIN || | |
225 | abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) { | |
226 | return 0; | |
227 | } | |
228 | ||
229 | for (i = 0; i < finger_down_count; i++) { | |
230 | if (data->chip->x_flip) | |
231 | pos_x[i] = data->chip->touch_x_max - pos_x[i]; | |
232 | if (data->chip->y_flip) | |
233 | pos_y[i] = data->chip->touch_y_max - pos_y[i]; | |
234 | ||
235 | input_report_abs(data->in_dev, | |
236 | ABS_MT_POSITION_X, pos_x[i]); | |
237 | input_report_abs(data->in_dev, | |
238 | ABS_MT_POSITION_Y, pos_y[i]); | |
239 | input_mt_sync(data->in_dev); | |
240 | } | |
241 | } else | |
242 | input_mt_sync(data->in_dev); | |
243 | ||
244 | input_sync(data->in_dev); | |
245 | ||
246 | return 0; | |
247 | } | |
248 | /** | |
249 | * bu21013_gpio_irq() - gpio thread function for touch interrupt | |
250 | * @irq: irq value | |
251 | * @device_data: void pointer | |
252 | * | |
253 | * This gpio thread function for touch interrupt | |
254 | * and returns irqreturn_t. | |
255 | */ | |
256 | static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) | |
257 | { | |
258 | struct bu21013_ts_data *data = device_data; | |
259 | struct i2c_client *i2c = data->client; | |
260 | int retval; | |
261 | ||
262 | do { | |
263 | retval = bu21013_do_touch_report(data); | |
264 | if (retval < 0) { | |
265 | dev_err(&i2c->dev, "bu21013_do_touch_report failed\n"); | |
266 | return IRQ_NONE; | |
267 | } | |
268 | ||
31fbcda7 | 269 | data->intr_pin = gpio_get_value(data->chip->touch_pin); |
4780c8df NKG |
270 | if (data->intr_pin == PEN_DOWN_INTR) |
271 | wait_event_timeout(data->wait, data->touch_stopped, | |
272 | msecs_to_jiffies(2)); | |
273 | } while (!data->intr_pin && !data->touch_stopped); | |
274 | ||
275 | return IRQ_HANDLED; | |
276 | } | |
277 | ||
278 | /** | |
279 | * bu21013_init_chip() - power on sequence for the bu21013 controller | |
280 | * @data: device structure pointer | |
281 | * | |
282 | * This function is used to power on | |
283 | * the bu21013 controller and returns integer. | |
284 | */ | |
285 | static int bu21013_init_chip(struct bu21013_ts_data *data) | |
286 | { | |
287 | int retval; | |
288 | struct i2c_client *i2c = data->client; | |
289 | ||
290 | retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG, | |
291 | BU21013_RESET_ENABLE); | |
292 | if (retval < 0) { | |
293 | dev_err(&i2c->dev, "BU21013_RESET reg write failed\n"); | |
294 | return retval; | |
295 | } | |
296 | msleep(RESET_DELAY); | |
297 | ||
298 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG, | |
299 | BU21013_SENSORS_EN_0_7); | |
300 | if (retval < 0) { | |
301 | dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n"); | |
302 | return retval; | |
303 | } | |
304 | ||
305 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG, | |
306 | BU21013_SENSORS_EN_8_15); | |
307 | if (retval < 0) { | |
308 | dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n"); | |
309 | return retval; | |
310 | } | |
311 | ||
312 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG, | |
313 | BU21013_SENSORS_EN_16_23); | |
314 | if (retval < 0) { | |
315 | dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n"); | |
316 | return retval; | |
317 | } | |
318 | ||
319 | retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG, | |
320 | (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1)); | |
321 | if (retval < 0) { | |
322 | dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n"); | |
323 | return retval; | |
324 | } | |
325 | ||
326 | retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG, | |
327 | (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 | | |
328 | BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW | | |
329 | BU21013_POS_MODE2_MULTI)); | |
330 | if (retval < 0) { | |
331 | dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n"); | |
332 | return retval; | |
333 | } | |
334 | ||
335 | if (data->chip->ext_clk) | |
336 | retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, | |
337 | (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB)); | |
338 | else | |
339 | retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, | |
340 | (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB)); | |
341 | if (retval < 0) { | |
342 | dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n"); | |
343 | return retval; | |
344 | } | |
345 | ||
346 | retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG, | |
347 | (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN)); | |
348 | if (retval < 0) { | |
349 | dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n"); | |
350 | return retval; | |
351 | } | |
352 | ||
353 | retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG, | |
354 | BU21013_INT_MODE_LEVEL); | |
355 | if (retval < 0) { | |
356 | dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n"); | |
357 | return retval; | |
358 | } | |
359 | ||
360 | retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG, | |
361 | (BU21013_DELTA_0_6 | | |
362 | BU21013_FILTER_EN)); | |
363 | if (retval < 0) { | |
364 | dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n"); | |
365 | return retval; | |
366 | } | |
367 | ||
368 | retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG, | |
369 | BU21013_TH_ON_5); | |
370 | if (retval < 0) { | |
371 | dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n"); | |
372 | return retval; | |
373 | } | |
374 | ||
375 | retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG, | |
ef11e701 | 376 | BU21013_TH_OFF_4 | BU21013_TH_OFF_3); |
4780c8df NKG |
377 | if (retval < 0) { |
378 | dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n"); | |
379 | return retval; | |
380 | } | |
381 | ||
382 | retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG, | |
383 | (BU21013_GAIN_0 | BU21013_GAIN_1)); | |
384 | if (retval < 0) { | |
385 | dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n"); | |
386 | return retval; | |
387 | } | |
388 | ||
389 | retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG, | |
390 | BU21013_OFFSET_MODE_DEFAULT); | |
391 | if (retval < 0) { | |
392 | dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n"); | |
393 | return retval; | |
394 | } | |
395 | ||
396 | retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG, | |
397 | (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 | | |
398 | BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3)); | |
399 | if (retval < 0) { | |
400 | dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n"); | |
401 | return retval; | |
402 | } | |
403 | ||
404 | retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG, | |
405 | BU21013_DONE); | |
406 | if (retval < 0) { | |
407 | dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n"); | |
408 | return retval; | |
409 | } | |
410 | ||
411 | return 0; | |
412 | } | |
413 | ||
414 | /** | |
415 | * bu21013_free_irq() - frees IRQ registered for touchscreen | |
416 | * @bu21013_data: device structure pointer | |
417 | * | |
418 | * This function signals interrupt thread to stop processing and | |
419 | * frees interrupt. | |
420 | */ | |
421 | static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data) | |
422 | { | |
423 | bu21013_data->touch_stopped = true; | |
424 | wake_up(&bu21013_data->wait); | |
31fbcda7 | 425 | free_irq(bu21013_data->irq, bu21013_data); |
4780c8df NKG |
426 | } |
427 | ||
31fbcda7 LJ |
428 | /** |
429 | * bu21013_cs_disable() - deconfigures the touch panel controller | |
430 | * @bu21013_data: device structure pointer | |
431 | * | |
432 | * This function is used to deconfigure the chip selection | |
433 | * for touch panel controller. | |
434 | */ | |
435 | static void bu21013_cs_disable(struct bu21013_ts_data *bu21013_data) | |
436 | { | |
437 | int error; | |
438 | ||
439 | error = gpio_direction_output(bu21013_data->chip->cs_pin, 0); | |
440 | if (error < 0) | |
441 | dev_warn(&bu21013_data->client->dev, | |
442 | "%s: gpio direction failed, error: %d\n", | |
443 | __func__, error); | |
444 | else | |
445 | gpio_set_value(bu21013_data->chip->cs_pin, 0); | |
446 | ||
447 | gpio_free(bu21013_data->chip->cs_pin); | |
448 | } | |
449 | ||
48fceb7d LJ |
450 | #ifdef CONFIG_OF |
451 | static const struct bu21013_platform_device * | |
452 | bu21013_parse_dt(struct device *dev) | |
453 | { | |
454 | struct device_node *np = dev->of_node; | |
455 | struct bu21013_platform_device *pdata; | |
456 | ||
457 | if (!np) { | |
458 | dev_err(dev, "no device tree or platform data\n"); | |
459 | return ERR_PTR(-EINVAL); | |
460 | } | |
461 | ||
462 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
463 | if (!pdata) | |
464 | return ERR_PTR(-ENOMEM); | |
465 | ||
466 | pdata->y_flip = pdata->x_flip = false; | |
467 | ||
468 | pdata->x_flip = of_property_read_bool(np, "rohm,flip-x"); | |
469 | pdata->y_flip = of_property_read_bool(np, "rohm,flip-y"); | |
470 | ||
471 | of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max); | |
472 | of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max); | |
473 | ||
474 | pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0); | |
475 | pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0); | |
476 | ||
477 | pdata->ext_clk = false; | |
478 | ||
479 | return pdata; | |
480 | } | |
481 | #else | |
482 | static inline const struct bu21013_platform_device * | |
483 | bu21013_parse_dt(struct device *dev) | |
484 | { | |
485 | dev_err(dev, "no platform data available\n"); | |
486 | return ERR_PTR(-EINVAL); | |
487 | } | |
488 | #endif | |
31fbcda7 | 489 | |
4780c8df NKG |
490 | /** |
491 | * bu21013_probe() - initializes the i2c-client touchscreen driver | |
492 | * @client: i2c client structure pointer | |
493 | * @id: i2c device id pointer | |
494 | * | |
495 | * This function used to initializes the i2c-client touchscreen | |
496 | * driver and returns integer. | |
497 | */ | |
5298cc4c | 498 | static int bu21013_probe(struct i2c_client *client, |
31fbcda7 | 499 | const struct i2c_device_id *id) |
4780c8df | 500 | { |
48fceb7d LJ |
501 | const struct bu21013_platform_device *pdata = |
502 | dev_get_platdata(&client->dev); | |
4780c8df NKG |
503 | struct bu21013_ts_data *bu21013_data; |
504 | struct input_dev *in_dev; | |
4780c8df NKG |
505 | int error; |
506 | ||
507 | if (!i2c_check_functionality(client->adapter, | |
508 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
509 | dev_err(&client->dev, "i2c smbus byte data not supported\n"); | |
510 | return -EIO; | |
511 | } | |
512 | ||
513 | if (!pdata) { | |
48fceb7d LJ |
514 | pdata = bu21013_parse_dt(&client->dev); |
515 | if (IS_ERR(pdata)) | |
516 | return PTR_ERR(pdata); | |
4780c8df NKG |
517 | } |
518 | ||
31fbcda7 LJ |
519 | if (!gpio_is_valid(pdata->touch_pin)) { |
520 | dev_err(&client->dev, "invalid touch_pin supplied\n"); | |
521 | return -EINVAL; | |
522 | } | |
523 | ||
4780c8df NKG |
524 | bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL); |
525 | in_dev = input_allocate_device(); | |
526 | if (!bu21013_data || !in_dev) { | |
527 | dev_err(&client->dev, "device memory alloc failed\n"); | |
528 | error = -ENOMEM; | |
529 | goto err_free_mem; | |
530 | } | |
531 | ||
532 | bu21013_data->in_dev = in_dev; | |
533 | bu21013_data->chip = pdata; | |
534 | bu21013_data->client = client; | |
31fbcda7 | 535 | bu21013_data->irq = gpio_to_irq(pdata->touch_pin); |
81e78dea | 536 | |
8c587f77 | 537 | bu21013_data->regulator = regulator_get(&client->dev, "avdd"); |
81e78dea NKG |
538 | if (IS_ERR(bu21013_data->regulator)) { |
539 | dev_err(&client->dev, "regulator_get failed\n"); | |
540 | error = PTR_ERR(bu21013_data->regulator); | |
541 | goto err_free_mem; | |
542 | } | |
543 | ||
544 | error = regulator_enable(bu21013_data->regulator); | |
545 | if (error < 0) { | |
546 | dev_err(&client->dev, "regulator enable failed\n"); | |
547 | goto err_put_regulator; | |
548 | } | |
549 | ||
4780c8df NKG |
550 | bu21013_data->touch_stopped = false; |
551 | init_waitqueue_head(&bu21013_data->wait); | |
552 | ||
553 | /* configure the gpio pins */ | |
31fbcda7 LJ |
554 | error = gpio_request_one(pdata->cs_pin, GPIOF_OUT_INIT_HIGH, |
555 | "touchp_reset"); | |
556 | if (error < 0) { | |
557 | dev_err(&client->dev, "Unable to request gpio reset_pin\n"); | |
558 | goto err_disable_regulator; | |
4780c8df NKG |
559 | } |
560 | ||
561 | /* configure the touch panel controller */ | |
562 | error = bu21013_init_chip(bu21013_data); | |
563 | if (error) { | |
564 | dev_err(&client->dev, "error in bu21013 config\n"); | |
565 | goto err_cs_disable; | |
566 | } | |
567 | ||
568 | /* register the device to input subsystem */ | |
569 | in_dev->name = DRIVER_TP; | |
570 | in_dev->id.bustype = BUS_I2C; | |
571 | in_dev->dev.parent = &client->dev; | |
572 | ||
573 | __set_bit(EV_SYN, in_dev->evbit); | |
574 | __set_bit(EV_KEY, in_dev->evbit); | |
575 | __set_bit(EV_ABS, in_dev->evbit); | |
576 | ||
577 | input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, | |
d2763b4f | 578 | pdata->touch_x_max, 0, 0); |
4780c8df | 579 | input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, |
d2763b4f | 580 | pdata->touch_y_max, 0, 0); |
4780c8df NKG |
581 | input_set_drvdata(in_dev, bu21013_data); |
582 | ||
31fbcda7 | 583 | error = request_threaded_irq(bu21013_data->irq, NULL, bu21013_gpio_irq, |
9b7e31bb LPC |
584 | IRQF_TRIGGER_FALLING | IRQF_SHARED | |
585 | IRQF_ONESHOT, | |
4780c8df NKG |
586 | DRIVER_TP, bu21013_data); |
587 | if (error) { | |
31fbcda7 LJ |
588 | dev_err(&client->dev, "request irq %d failed\n", |
589 | bu21013_data->irq); | |
4780c8df NKG |
590 | goto err_cs_disable; |
591 | } | |
592 | ||
593 | error = input_register_device(in_dev); | |
594 | if (error) { | |
595 | dev_err(&client->dev, "failed to register input device\n"); | |
596 | goto err_free_irq; | |
597 | } | |
598 | ||
599 | device_init_wakeup(&client->dev, pdata->wakeup); | |
600 | i2c_set_clientdata(client, bu21013_data); | |
601 | ||
602 | return 0; | |
603 | ||
604 | err_free_irq: | |
605 | bu21013_free_irq(bu21013_data); | |
606 | err_cs_disable: | |
31fbcda7 | 607 | bu21013_cs_disable(bu21013_data); |
81e78dea NKG |
608 | err_disable_regulator: |
609 | regulator_disable(bu21013_data->regulator); | |
610 | err_put_regulator: | |
611 | regulator_put(bu21013_data->regulator); | |
4780c8df | 612 | err_free_mem: |
bac64d0f | 613 | input_free_device(in_dev); |
4780c8df NKG |
614 | kfree(bu21013_data); |
615 | ||
616 | return error; | |
617 | } | |
618 | /** | |
619 | * bu21013_remove() - removes the i2c-client touchscreen driver | |
620 | * @client: i2c client structure pointer | |
621 | * | |
622 | * This function uses to remove the i2c-client | |
623 | * touchscreen driver and returns integer. | |
624 | */ | |
e2619cf7 | 625 | static int bu21013_remove(struct i2c_client *client) |
4780c8df NKG |
626 | { |
627 | struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client); | |
628 | ||
629 | bu21013_free_irq(bu21013_data); | |
630 | ||
31fbcda7 | 631 | bu21013_cs_disable(bu21013_data); |
4780c8df NKG |
632 | |
633 | input_unregister_device(bu21013_data->in_dev); | |
81e78dea NKG |
634 | |
635 | regulator_disable(bu21013_data->regulator); | |
636 | regulator_put(bu21013_data->regulator); | |
637 | ||
4780c8df NKG |
638 | kfree(bu21013_data); |
639 | ||
640 | device_init_wakeup(&client->dev, false); | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | #ifdef CONFIG_PM | |
646 | /** | |
647 | * bu21013_suspend() - suspend the touch screen controller | |
648 | * @dev: pointer to device structure | |
649 | * | |
650 | * This function is used to suspend the | |
651 | * touch panel controller and returns integer | |
652 | */ | |
653 | static int bu21013_suspend(struct device *dev) | |
654 | { | |
655 | struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); | |
656 | struct i2c_client *client = bu21013_data->client; | |
657 | ||
658 | bu21013_data->touch_stopped = true; | |
659 | if (device_may_wakeup(&client->dev)) | |
31fbcda7 | 660 | enable_irq_wake(bu21013_data->irq); |
4780c8df | 661 | else |
31fbcda7 | 662 | disable_irq(bu21013_data->irq); |
4780c8df | 663 | |
81e78dea NKG |
664 | regulator_disable(bu21013_data->regulator); |
665 | ||
4780c8df NKG |
666 | return 0; |
667 | } | |
668 | ||
669 | /** | |
670 | * bu21013_resume() - resume the touch screen controller | |
671 | * @dev: pointer to device structure | |
672 | * | |
673 | * This function is used to resume the touch panel | |
674 | * controller and returns integer. | |
675 | */ | |
676 | static int bu21013_resume(struct device *dev) | |
677 | { | |
678 | struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); | |
679 | struct i2c_client *client = bu21013_data->client; | |
680 | int retval; | |
681 | ||
81e78dea NKG |
682 | retval = regulator_enable(bu21013_data->regulator); |
683 | if (retval < 0) { | |
684 | dev_err(&client->dev, "bu21013 regulator enable failed\n"); | |
685 | return retval; | |
686 | } | |
687 | ||
4780c8df NKG |
688 | retval = bu21013_init_chip(bu21013_data); |
689 | if (retval < 0) { | |
690 | dev_err(&client->dev, "bu21013 controller config failed\n"); | |
691 | return retval; | |
692 | } | |
693 | ||
694 | bu21013_data->touch_stopped = false; | |
695 | ||
696 | if (device_may_wakeup(&client->dev)) | |
31fbcda7 | 697 | disable_irq_wake(bu21013_data->irq); |
4780c8df | 698 | else |
31fbcda7 | 699 | enable_irq(bu21013_data->irq); |
4780c8df NKG |
700 | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static const struct dev_pm_ops bu21013_dev_pm_ops = { | |
705 | .suspend = bu21013_suspend, | |
706 | .resume = bu21013_resume, | |
707 | }; | |
708 | #endif | |
709 | ||
710 | static const struct i2c_device_id bu21013_id[] = { | |
711 | { DRIVER_TP, 0 }, | |
712 | { } | |
713 | }; | |
714 | MODULE_DEVICE_TABLE(i2c, bu21013_id); | |
715 | ||
716 | static struct i2c_driver bu21013_driver = { | |
717 | .driver = { | |
718 | .name = DRIVER_TP, | |
719 | .owner = THIS_MODULE, | |
720 | #ifdef CONFIG_PM | |
721 | .pm = &bu21013_dev_pm_ops, | |
722 | #endif | |
723 | }, | |
724 | .probe = bu21013_probe, | |
1cb0aa88 | 725 | .remove = bu21013_remove, |
4780c8df NKG |
726 | .id_table = bu21013_id, |
727 | }; | |
728 | ||
1b92c1cf | 729 | module_i2c_driver(bu21013_driver); |
4780c8df NKG |
730 | |
731 | MODULE_LICENSE("GPL v2"); | |
732 | MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>"); | |
733 | MODULE_DESCRIPTION("bu21013 touch screen controller driver"); |