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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> | |
15 | ||
16 | #define PEN_DOWN_INTR 0 | |
17 | #define MAX_FINGERS 2 | |
18 | #define RESET_DELAY 30 | |
19 | #define PENUP_TIMEOUT (10) | |
20 | #define DELTA_MIN 16 | |
21 | #define MASK_BITS 0x03 | |
22 | #define SHIFT_8 8 | |
23 | #define SHIFT_2 2 | |
24 | #define LENGTH_OF_BUFFER 11 | |
25 | #define I2C_RETRY_COUNT 5 | |
26 | ||
27 | #define BU21013_SENSORS_BTN_0_7_REG 0x70 | |
28 | #define BU21013_SENSORS_BTN_8_15_REG 0x71 | |
29 | #define BU21013_SENSORS_BTN_16_23_REG 0x72 | |
30 | #define BU21013_X1_POS_MSB_REG 0x73 | |
31 | #define BU21013_X1_POS_LSB_REG 0x74 | |
32 | #define BU21013_Y1_POS_MSB_REG 0x75 | |
33 | #define BU21013_Y1_POS_LSB_REG 0x76 | |
34 | #define BU21013_X2_POS_MSB_REG 0x77 | |
35 | #define BU21013_X2_POS_LSB_REG 0x78 | |
36 | #define BU21013_Y2_POS_MSB_REG 0x79 | |
37 | #define BU21013_Y2_POS_LSB_REG 0x7A | |
38 | #define BU21013_INT_CLR_REG 0xE8 | |
39 | #define BU21013_INT_MODE_REG 0xE9 | |
40 | #define BU21013_GAIN_REG 0xEA | |
41 | #define BU21013_OFFSET_MODE_REG 0xEB | |
42 | #define BU21013_XY_EDGE_REG 0xEC | |
43 | #define BU21013_RESET_REG 0xED | |
44 | #define BU21013_CALIB_REG 0xEE | |
45 | #define BU21013_DONE_REG 0xEF | |
46 | #define BU21013_SENSOR_0_7_REG 0xF0 | |
47 | #define BU21013_SENSOR_8_15_REG 0xF1 | |
48 | #define BU21013_SENSOR_16_23_REG 0xF2 | |
49 | #define BU21013_POS_MODE1_REG 0xF3 | |
50 | #define BU21013_POS_MODE2_REG 0xF4 | |
51 | #define BU21013_CLK_MODE_REG 0xF5 | |
52 | #define BU21013_IDLE_REG 0xFA | |
53 | #define BU21013_FILTER_REG 0xFB | |
54 | #define BU21013_TH_ON_REG 0xFC | |
55 | #define BU21013_TH_OFF_REG 0xFD | |
56 | ||
57 | ||
58 | #define BU21013_RESET_ENABLE 0x01 | |
59 | ||
60 | #define BU21013_SENSORS_EN_0_7 0x3F | |
61 | #define BU21013_SENSORS_EN_8_15 0xFC | |
62 | #define BU21013_SENSORS_EN_16_23 0x1F | |
63 | ||
64 | #define BU21013_POS_MODE1_0 0x02 | |
65 | #define BU21013_POS_MODE1_1 0x04 | |
66 | #define BU21013_POS_MODE1_2 0x08 | |
67 | ||
68 | #define BU21013_POS_MODE2_ZERO 0x01 | |
69 | #define BU21013_POS_MODE2_AVG1 0x02 | |
70 | #define BU21013_POS_MODE2_AVG2 0x04 | |
71 | #define BU21013_POS_MODE2_EN_XY 0x08 | |
72 | #define BU21013_POS_MODE2_EN_RAW 0x10 | |
73 | #define BU21013_POS_MODE2_MULTI 0x80 | |
74 | ||
75 | #define BU21013_CLK_MODE_DIV 0x01 | |
76 | #define BU21013_CLK_MODE_EXT 0x02 | |
77 | #define BU21013_CLK_MODE_CALIB 0x80 | |
78 | ||
79 | #define BU21013_IDLET_0 0x01 | |
80 | #define BU21013_IDLET_1 0x02 | |
81 | #define BU21013_IDLET_2 0x04 | |
82 | #define BU21013_IDLET_3 0x08 | |
83 | #define BU21013_IDLE_INTERMIT_EN 0x10 | |
84 | ||
85 | #define BU21013_DELTA_0_6 0x7F | |
86 | #define BU21013_FILTER_EN 0x80 | |
87 | ||
88 | #define BU21013_INT_MODE_LEVEL 0x00 | |
89 | #define BU21013_INT_MODE_EDGE 0x01 | |
90 | ||
91 | #define BU21013_GAIN_0 0x01 | |
92 | #define BU21013_GAIN_1 0x02 | |
93 | #define BU21013_GAIN_2 0x04 | |
94 | ||
95 | #define BU21013_OFFSET_MODE_DEFAULT 0x00 | |
96 | #define BU21013_OFFSET_MODE_MOVE 0x01 | |
97 | #define BU21013_OFFSET_MODE_DISABLE 0x02 | |
98 | ||
99 | #define BU21013_TH_ON_0 0x01 | |
100 | #define BU21013_TH_ON_1 0x02 | |
101 | #define BU21013_TH_ON_2 0x04 | |
102 | #define BU21013_TH_ON_3 0x08 | |
103 | #define BU21013_TH_ON_4 0x10 | |
104 | #define BU21013_TH_ON_5 0x20 | |
105 | #define BU21013_TH_ON_6 0x40 | |
106 | #define BU21013_TH_ON_7 0x80 | |
107 | #define BU21013_TH_ON_MAX 0xFF | |
108 | ||
109 | #define BU21013_TH_OFF_0 0x01 | |
110 | #define BU21013_TH_OFF_1 0x02 | |
111 | #define BU21013_TH_OFF_2 0x04 | |
112 | #define BU21013_TH_OFF_3 0x08 | |
113 | #define BU21013_TH_OFF_4 0x10 | |
114 | #define BU21013_TH_OFF_5 0x20 | |
115 | #define BU21013_TH_OFF_6 0x40 | |
116 | #define BU21013_TH_OFF_7 0x80 | |
117 | #define BU21013_TH_OFF_MAX 0xFF | |
118 | ||
119 | #define BU21013_X_EDGE_0 0x01 | |
120 | #define BU21013_X_EDGE_1 0x02 | |
121 | #define BU21013_X_EDGE_2 0x04 | |
122 | #define BU21013_X_EDGE_3 0x08 | |
123 | #define BU21013_Y_EDGE_0 0x10 | |
124 | #define BU21013_Y_EDGE_1 0x20 | |
125 | #define BU21013_Y_EDGE_2 0x40 | |
126 | #define BU21013_Y_EDGE_3 0x80 | |
127 | ||
128 | #define BU21013_DONE 0x01 | |
129 | #define BU21013_NUMBER_OF_X_SENSORS (6) | |
130 | #define BU21013_NUMBER_OF_Y_SENSORS (11) | |
131 | ||
132 | #define DRIVER_TP "bu21013_tp" | |
133 | ||
134 | /** | |
135 | * struct bu21013_ts_data - touch panel data structure | |
136 | * @client: pointer to the i2c client | |
137 | * @wait: variable to wait_queue_head_t structure | |
138 | * @touch_stopped: touch stop flag | |
139 | * @chip: pointer to the touch panel controller | |
140 | * @in_dev: pointer to the input device structure | |
141 | * @intr_pin: interrupt pin value | |
142 | * | |
143 | * Touch panel device data structure | |
144 | */ | |
145 | struct bu21013_ts_data { | |
146 | struct i2c_client *client; | |
147 | wait_queue_head_t wait; | |
148 | bool touch_stopped; | |
149 | const struct bu21013_platform_device *chip; | |
150 | struct input_dev *in_dev; | |
151 | unsigned int intr_pin; | |
152 | }; | |
153 | ||
154 | /** | |
155 | * bu21013_read_block_data(): read the touch co-ordinates | |
156 | * @data: bu21013_ts_data structure pointer | |
157 | * @buf: byte pointer | |
158 | * | |
159 | * Read the touch co-ordinates using i2c read block into buffer | |
160 | * and returns integer. | |
161 | */ | |
162 | static int bu21013_read_block_data(struct bu21013_ts_data *data, u8 *buf) | |
163 | { | |
164 | int ret, i; | |
165 | ||
166 | for (i = 0; i < I2C_RETRY_COUNT; i++) { | |
167 | ret = i2c_smbus_read_i2c_block_data | |
168 | (data->client, BU21013_SENSORS_BTN_0_7_REG, | |
169 | LENGTH_OF_BUFFER, buf); | |
170 | if (ret == LENGTH_OF_BUFFER) | |
171 | return 0; | |
172 | } | |
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | /** | |
177 | * bu21013_do_touch_report(): Get the touch co-ordinates | |
178 | * @data: bu21013_ts_data structure pointer | |
179 | * | |
180 | * Get the touch co-ordinates from touch sensor registers and writes | |
181 | * into device structure and returns integer. | |
182 | */ | |
183 | static int bu21013_do_touch_report(struct bu21013_ts_data *data) | |
184 | { | |
185 | u8 buf[LENGTH_OF_BUFFER]; | |
186 | unsigned int pos_x[2], pos_y[2]; | |
187 | bool has_x_sensors, has_y_sensors; | |
188 | int finger_down_count = 0; | |
189 | int i; | |
190 | ||
191 | if (data == NULL) | |
192 | return -EINVAL; | |
193 | ||
194 | if (bu21013_read_block_data(data, buf) < 0) | |
195 | return -EINVAL; | |
196 | ||
197 | has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7); | |
198 | has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) | | |
199 | ((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2); | |
200 | if (!has_x_sensors || !has_y_sensors) | |
201 | return 0; | |
202 | ||
203 | for (i = 0; i < MAX_FINGERS; i++) { | |
204 | const u8 *p = &buf[4 * i + 3]; | |
205 | unsigned int x = p[0] << SHIFT_2 | (p[1] & MASK_BITS); | |
206 | unsigned int y = p[2] << SHIFT_2 | (p[3] & MASK_BITS); | |
207 | if (x == 0 || y == 0) | |
208 | continue; | |
209 | pos_x[finger_down_count] = x; | |
210 | pos_y[finger_down_count] = y; | |
211 | finger_down_count++; | |
212 | } | |
213 | ||
214 | if (finger_down_count) { | |
215 | if (finger_down_count == 2 && | |
216 | (abs(pos_x[0] - pos_x[1]) < DELTA_MIN || | |
217 | abs(pos_y[0] - pos_y[1]) < DELTA_MIN)) { | |
218 | return 0; | |
219 | } | |
220 | ||
221 | for (i = 0; i < finger_down_count; i++) { | |
222 | if (data->chip->x_flip) | |
223 | pos_x[i] = data->chip->touch_x_max - pos_x[i]; | |
224 | if (data->chip->y_flip) | |
225 | pos_y[i] = data->chip->touch_y_max - pos_y[i]; | |
226 | ||
227 | input_report_abs(data->in_dev, | |
228 | ABS_MT_POSITION_X, pos_x[i]); | |
229 | input_report_abs(data->in_dev, | |
230 | ABS_MT_POSITION_Y, pos_y[i]); | |
231 | input_mt_sync(data->in_dev); | |
232 | } | |
233 | } else | |
234 | input_mt_sync(data->in_dev); | |
235 | ||
236 | input_sync(data->in_dev); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | /** | |
241 | * bu21013_gpio_irq() - gpio thread function for touch interrupt | |
242 | * @irq: irq value | |
243 | * @device_data: void pointer | |
244 | * | |
245 | * This gpio thread function for touch interrupt | |
246 | * and returns irqreturn_t. | |
247 | */ | |
248 | static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) | |
249 | { | |
250 | struct bu21013_ts_data *data = device_data; | |
251 | struct i2c_client *i2c = data->client; | |
252 | int retval; | |
253 | ||
254 | do { | |
255 | retval = bu21013_do_touch_report(data); | |
256 | if (retval < 0) { | |
257 | dev_err(&i2c->dev, "bu21013_do_touch_report failed\n"); | |
258 | return IRQ_NONE; | |
259 | } | |
260 | ||
261 | data->intr_pin = data->chip->irq_read_val(); | |
262 | if (data->intr_pin == PEN_DOWN_INTR) | |
263 | wait_event_timeout(data->wait, data->touch_stopped, | |
264 | msecs_to_jiffies(2)); | |
265 | } while (!data->intr_pin && !data->touch_stopped); | |
266 | ||
267 | return IRQ_HANDLED; | |
268 | } | |
269 | ||
270 | /** | |
271 | * bu21013_init_chip() - power on sequence for the bu21013 controller | |
272 | * @data: device structure pointer | |
273 | * | |
274 | * This function is used to power on | |
275 | * the bu21013 controller and returns integer. | |
276 | */ | |
277 | static int bu21013_init_chip(struct bu21013_ts_data *data) | |
278 | { | |
279 | int retval; | |
280 | struct i2c_client *i2c = data->client; | |
281 | ||
282 | retval = i2c_smbus_write_byte_data(i2c, BU21013_RESET_REG, | |
283 | BU21013_RESET_ENABLE); | |
284 | if (retval < 0) { | |
285 | dev_err(&i2c->dev, "BU21013_RESET reg write failed\n"); | |
286 | return retval; | |
287 | } | |
288 | msleep(RESET_DELAY); | |
289 | ||
290 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_0_7_REG, | |
291 | BU21013_SENSORS_EN_0_7); | |
292 | if (retval < 0) { | |
293 | dev_err(&i2c->dev, "BU21013_SENSOR_0_7 reg write failed\n"); | |
294 | return retval; | |
295 | } | |
296 | ||
297 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_8_15_REG, | |
298 | BU21013_SENSORS_EN_8_15); | |
299 | if (retval < 0) { | |
300 | dev_err(&i2c->dev, "BU21013_SENSOR_8_15 reg write failed\n"); | |
301 | return retval; | |
302 | } | |
303 | ||
304 | retval = i2c_smbus_write_byte_data(i2c, BU21013_SENSOR_16_23_REG, | |
305 | BU21013_SENSORS_EN_16_23); | |
306 | if (retval < 0) { | |
307 | dev_err(&i2c->dev, "BU21013_SENSOR_16_23 reg write failed\n"); | |
308 | return retval; | |
309 | } | |
310 | ||
311 | retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE1_REG, | |
312 | (BU21013_POS_MODE1_0 | BU21013_POS_MODE1_1)); | |
313 | if (retval < 0) { | |
314 | dev_err(&i2c->dev, "BU21013_POS_MODE1 reg write failed\n"); | |
315 | return retval; | |
316 | } | |
317 | ||
318 | retval = i2c_smbus_write_byte_data(i2c, BU21013_POS_MODE2_REG, | |
319 | (BU21013_POS_MODE2_ZERO | BU21013_POS_MODE2_AVG1 | | |
320 | BU21013_POS_MODE2_AVG2 | BU21013_POS_MODE2_EN_RAW | | |
321 | BU21013_POS_MODE2_MULTI)); | |
322 | if (retval < 0) { | |
323 | dev_err(&i2c->dev, "BU21013_POS_MODE2 reg write failed\n"); | |
324 | return retval; | |
325 | } | |
326 | ||
327 | if (data->chip->ext_clk) | |
328 | retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, | |
329 | (BU21013_CLK_MODE_EXT | BU21013_CLK_MODE_CALIB)); | |
330 | else | |
331 | retval = i2c_smbus_write_byte_data(i2c, BU21013_CLK_MODE_REG, | |
332 | (BU21013_CLK_MODE_DIV | BU21013_CLK_MODE_CALIB)); | |
333 | if (retval < 0) { | |
334 | dev_err(&i2c->dev, "BU21013_CLK_MODE reg write failed\n"); | |
335 | return retval; | |
336 | } | |
337 | ||
338 | retval = i2c_smbus_write_byte_data(i2c, BU21013_IDLE_REG, | |
339 | (BU21013_IDLET_0 | BU21013_IDLE_INTERMIT_EN)); | |
340 | if (retval < 0) { | |
341 | dev_err(&i2c->dev, "BU21013_IDLE reg write failed\n"); | |
342 | return retval; | |
343 | } | |
344 | ||
345 | retval = i2c_smbus_write_byte_data(i2c, BU21013_INT_MODE_REG, | |
346 | BU21013_INT_MODE_LEVEL); | |
347 | if (retval < 0) { | |
348 | dev_err(&i2c->dev, "BU21013_INT_MODE reg write failed\n"); | |
349 | return retval; | |
350 | } | |
351 | ||
352 | retval = i2c_smbus_write_byte_data(i2c, BU21013_FILTER_REG, | |
353 | (BU21013_DELTA_0_6 | | |
354 | BU21013_FILTER_EN)); | |
355 | if (retval < 0) { | |
356 | dev_err(&i2c->dev, "BU21013_FILTER reg write failed\n"); | |
357 | return retval; | |
358 | } | |
359 | ||
360 | retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_ON_REG, | |
361 | BU21013_TH_ON_5); | |
362 | if (retval < 0) { | |
363 | dev_err(&i2c->dev, "BU21013_TH_ON reg write failed\n"); | |
364 | return retval; | |
365 | } | |
366 | ||
367 | retval = i2c_smbus_write_byte_data(i2c, BU21013_TH_OFF_REG, | |
368 | BU21013_TH_OFF_4 || BU21013_TH_OFF_3); | |
369 | if (retval < 0) { | |
370 | dev_err(&i2c->dev, "BU21013_TH_OFF reg write failed\n"); | |
371 | return retval; | |
372 | } | |
373 | ||
374 | retval = i2c_smbus_write_byte_data(i2c, BU21013_GAIN_REG, | |
375 | (BU21013_GAIN_0 | BU21013_GAIN_1)); | |
376 | if (retval < 0) { | |
377 | dev_err(&i2c->dev, "BU21013_GAIN reg write failed\n"); | |
378 | return retval; | |
379 | } | |
380 | ||
381 | retval = i2c_smbus_write_byte_data(i2c, BU21013_OFFSET_MODE_REG, | |
382 | BU21013_OFFSET_MODE_DEFAULT); | |
383 | if (retval < 0) { | |
384 | dev_err(&i2c->dev, "BU21013_OFFSET_MODE reg write failed\n"); | |
385 | return retval; | |
386 | } | |
387 | ||
388 | retval = i2c_smbus_write_byte_data(i2c, BU21013_XY_EDGE_REG, | |
389 | (BU21013_X_EDGE_0 | BU21013_X_EDGE_2 | | |
390 | BU21013_Y_EDGE_1 | BU21013_Y_EDGE_3)); | |
391 | if (retval < 0) { | |
392 | dev_err(&i2c->dev, "BU21013_XY_EDGE reg write failed\n"); | |
393 | return retval; | |
394 | } | |
395 | ||
396 | retval = i2c_smbus_write_byte_data(i2c, BU21013_DONE_REG, | |
397 | BU21013_DONE); | |
398 | if (retval < 0) { | |
399 | dev_err(&i2c->dev, "BU21013_REG_DONE reg write failed\n"); | |
400 | return retval; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | /** | |
407 | * bu21013_free_irq() - frees IRQ registered for touchscreen | |
408 | * @bu21013_data: device structure pointer | |
409 | * | |
410 | * This function signals interrupt thread to stop processing and | |
411 | * frees interrupt. | |
412 | */ | |
413 | static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data) | |
414 | { | |
415 | bu21013_data->touch_stopped = true; | |
416 | wake_up(&bu21013_data->wait); | |
417 | free_irq(bu21013_data->chip->irq, bu21013_data); | |
418 | } | |
419 | ||
420 | /** | |
421 | * bu21013_probe() - initializes the i2c-client touchscreen driver | |
422 | * @client: i2c client structure pointer | |
423 | * @id: i2c device id pointer | |
424 | * | |
425 | * This function used to initializes the i2c-client touchscreen | |
426 | * driver and returns integer. | |
427 | */ | |
428 | static int __devinit bu21013_probe(struct i2c_client *client, | |
429 | const struct i2c_device_id *id) | |
430 | { | |
431 | struct bu21013_ts_data *bu21013_data; | |
432 | struct input_dev *in_dev; | |
433 | const struct bu21013_platform_device *pdata = | |
434 | client->dev.platform_data; | |
435 | int error; | |
436 | ||
437 | if (!i2c_check_functionality(client->adapter, | |
438 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
439 | dev_err(&client->dev, "i2c smbus byte data not supported\n"); | |
440 | return -EIO; | |
441 | } | |
442 | ||
443 | if (!pdata) { | |
444 | dev_err(&client->dev, "platform data not defined\n"); | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | bu21013_data = kzalloc(sizeof(struct bu21013_ts_data), GFP_KERNEL); | |
449 | in_dev = input_allocate_device(); | |
450 | if (!bu21013_data || !in_dev) { | |
451 | dev_err(&client->dev, "device memory alloc failed\n"); | |
452 | error = -ENOMEM; | |
453 | goto err_free_mem; | |
454 | } | |
455 | ||
456 | bu21013_data->in_dev = in_dev; | |
457 | bu21013_data->chip = pdata; | |
458 | bu21013_data->client = client; | |
459 | bu21013_data->touch_stopped = false; | |
460 | init_waitqueue_head(&bu21013_data->wait); | |
461 | ||
462 | /* configure the gpio pins */ | |
463 | if (pdata->cs_en) { | |
464 | error = pdata->cs_en(pdata->cs_pin); | |
465 | if (error < 0) { | |
466 | dev_err(&client->dev, "chip init failed\n"); | |
467 | goto err_free_mem; | |
468 | } | |
469 | } | |
470 | ||
471 | /* configure the touch panel controller */ | |
472 | error = bu21013_init_chip(bu21013_data); | |
473 | if (error) { | |
474 | dev_err(&client->dev, "error in bu21013 config\n"); | |
475 | goto err_cs_disable; | |
476 | } | |
477 | ||
478 | /* register the device to input subsystem */ | |
479 | in_dev->name = DRIVER_TP; | |
480 | in_dev->id.bustype = BUS_I2C; | |
481 | in_dev->dev.parent = &client->dev; | |
482 | ||
483 | __set_bit(EV_SYN, in_dev->evbit); | |
484 | __set_bit(EV_KEY, in_dev->evbit); | |
485 | __set_bit(EV_ABS, in_dev->evbit); | |
486 | ||
487 | input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, | |
488 | pdata->x_max_res, 0, 0); | |
489 | input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, | |
490 | pdata->y_max_res, 0, 0); | |
491 | input_set_drvdata(in_dev, bu21013_data); | |
492 | ||
493 | error = request_threaded_irq(pdata->irq, NULL, bu21013_gpio_irq, | |
494 | IRQF_TRIGGER_FALLING | IRQF_SHARED, | |
495 | DRIVER_TP, bu21013_data); | |
496 | if (error) { | |
497 | dev_err(&client->dev, "request irq %d failed\n", pdata->irq); | |
498 | goto err_cs_disable; | |
499 | } | |
500 | ||
501 | error = input_register_device(in_dev); | |
502 | if (error) { | |
503 | dev_err(&client->dev, "failed to register input device\n"); | |
504 | goto err_free_irq; | |
505 | } | |
506 | ||
507 | device_init_wakeup(&client->dev, pdata->wakeup); | |
508 | i2c_set_clientdata(client, bu21013_data); | |
509 | ||
510 | return 0; | |
511 | ||
512 | err_free_irq: | |
513 | bu21013_free_irq(bu21013_data); | |
514 | err_cs_disable: | |
515 | pdata->cs_dis(pdata->cs_pin); | |
516 | err_free_mem: | |
bac64d0f | 517 | input_free_device(in_dev); |
4780c8df NKG |
518 | kfree(bu21013_data); |
519 | ||
520 | return error; | |
521 | } | |
522 | /** | |
523 | * bu21013_remove() - removes the i2c-client touchscreen driver | |
524 | * @client: i2c client structure pointer | |
525 | * | |
526 | * This function uses to remove the i2c-client | |
527 | * touchscreen driver and returns integer. | |
528 | */ | |
529 | static int __devexit bu21013_remove(struct i2c_client *client) | |
530 | { | |
531 | struct bu21013_ts_data *bu21013_data = i2c_get_clientdata(client); | |
532 | ||
533 | bu21013_free_irq(bu21013_data); | |
534 | ||
535 | bu21013_data->chip->cs_dis(bu21013_data->chip->cs_pin); | |
536 | ||
537 | input_unregister_device(bu21013_data->in_dev); | |
538 | kfree(bu21013_data); | |
539 | ||
540 | device_init_wakeup(&client->dev, false); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | #ifdef CONFIG_PM | |
546 | /** | |
547 | * bu21013_suspend() - suspend the touch screen controller | |
548 | * @dev: pointer to device structure | |
549 | * | |
550 | * This function is used to suspend the | |
551 | * touch panel controller and returns integer | |
552 | */ | |
553 | static int bu21013_suspend(struct device *dev) | |
554 | { | |
555 | struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); | |
556 | struct i2c_client *client = bu21013_data->client; | |
557 | ||
558 | bu21013_data->touch_stopped = true; | |
559 | if (device_may_wakeup(&client->dev)) | |
560 | enable_irq_wake(bu21013_data->chip->irq); | |
561 | else | |
562 | disable_irq(bu21013_data->chip->irq); | |
563 | ||
564 | return 0; | |
565 | } | |
566 | ||
567 | /** | |
568 | * bu21013_resume() - resume the touch screen controller | |
569 | * @dev: pointer to device structure | |
570 | * | |
571 | * This function is used to resume the touch panel | |
572 | * controller and returns integer. | |
573 | */ | |
574 | static int bu21013_resume(struct device *dev) | |
575 | { | |
576 | struct bu21013_ts_data *bu21013_data = dev_get_drvdata(dev); | |
577 | struct i2c_client *client = bu21013_data->client; | |
578 | int retval; | |
579 | ||
580 | retval = bu21013_init_chip(bu21013_data); | |
581 | if (retval < 0) { | |
582 | dev_err(&client->dev, "bu21013 controller config failed\n"); | |
583 | return retval; | |
584 | } | |
585 | ||
586 | bu21013_data->touch_stopped = false; | |
587 | ||
588 | if (device_may_wakeup(&client->dev)) | |
589 | disable_irq_wake(bu21013_data->chip->irq); | |
590 | else | |
591 | enable_irq(bu21013_data->chip->irq); | |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | static const struct dev_pm_ops bu21013_dev_pm_ops = { | |
597 | .suspend = bu21013_suspend, | |
598 | .resume = bu21013_resume, | |
599 | }; | |
600 | #endif | |
601 | ||
602 | static const struct i2c_device_id bu21013_id[] = { | |
603 | { DRIVER_TP, 0 }, | |
604 | { } | |
605 | }; | |
606 | MODULE_DEVICE_TABLE(i2c, bu21013_id); | |
607 | ||
608 | static struct i2c_driver bu21013_driver = { | |
609 | .driver = { | |
610 | .name = DRIVER_TP, | |
611 | .owner = THIS_MODULE, | |
612 | #ifdef CONFIG_PM | |
613 | .pm = &bu21013_dev_pm_ops, | |
614 | #endif | |
615 | }, | |
616 | .probe = bu21013_probe, | |
617 | .remove = __devexit_p(bu21013_remove), | |
618 | .id_table = bu21013_id, | |
619 | }; | |
620 | ||
621 | /** | |
622 | * bu21013_init() - initializes the bu21013 touchscreen driver | |
623 | * | |
624 | * This function used to initializes the bu21013 | |
625 | * touchscreen driver and returns integer. | |
626 | */ | |
627 | static int __init bu21013_init(void) | |
628 | { | |
629 | return i2c_add_driver(&bu21013_driver); | |
630 | } | |
631 | ||
632 | /** | |
633 | * bu21013_exit() - de-initializes the bu21013 touchscreen driver | |
634 | * | |
635 | * This function uses to de-initializes the bu21013 | |
636 | * touchscreen driver and returns none. | |
637 | */ | |
638 | static void __exit bu21013_exit(void) | |
639 | { | |
640 | i2c_del_driver(&bu21013_driver); | |
641 | } | |
642 | ||
643 | module_init(bu21013_init); | |
644 | module_exit(bu21013_exit); | |
645 | ||
646 | MODULE_LICENSE("GPL v2"); | |
647 | MODULE_AUTHOR("Naveen Kumar G <naveen.gaddipati@stericsson.com>"); | |
648 | MODULE_DESCRIPTION("bu21013 touch screen controller driver"); |