1 /*
2 * clearpad_tm1217.c - Touch Screen driver for Synaptics Clearpad
3 * TM1217 controller
4 *
5 * Copyright (C) 2008 Intel Corp
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; ifnot, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * Questions/Comments/Bug fixes to Ramesh Agarwal (ramesh.agarwal@intel.com)
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/input.h>
29 #include <linux/interrupt.h>
30 #include <linux/io.h>
31 #include <linux/i2c.h>
32 #include <linux/timer.h>
33 #include <linux/gpio.h>
34 #include <linux/hrtimer.h>
35 #include <linux/kthread.h>
36 #include <linux/delay.h>
37 #include <linux/slab.h>
38 #include "cp_tm1217.h"
39
40 #define CPTM1217_DEVICE_NAME "cptm1217"
41 #define CPTM1217_DRIVER_NAME CPTM1217_DEVICE_NAME
42
43 #define MAX_TOUCH_SUPPORTED 2
44 #define TOUCH_SUPPORTED 1
45 #define SAMPLING_FREQ 80 /* Frequency in HZ */
46 #define DELAY_BTWIN_SAMPLE (1000 / SAMPLING_FREQ)
47 #define WAIT_FOR_RESPONSE 5 /* 5msec just works */
48 #define MAX_RETRIES 5 /* As above */
49 #define INCREMENTAL_DELAY 5 /* As above */
50
51 /* Regster Definitions */
52 #define TMA1217_DEV_STATUS 0x13 /* Device Status */
53 #define TMA1217_INT_STATUS 0x14 /* Interrupt Status */
54
55 /* Controller can detect up to 2 possible finger touches.
56 * Each finger touch provides 12 bit X Y co-ordinates, the values are split
57 * across 2 registers, and an 8 bit Z value */
58 #define TMA1217_FINGER_STATE 0x18 /* Finger State */
59 #define TMA1217_FINGER1_X_HIGHER8 0x19 /* Higher 8 bit of X coordinate */
60 #define TMA1217_FINGER1_Y_HIGHER8 0x1A /* Higher 8 bit of Y coordinate */
61 #define TMA1217_FINGER1_XY_LOWER4 0x1B /* Lower 4 bits of X and Y */
62 #define TMA1217_FINGER1_Z_VALUE 0x1D /* 8 bit Z value for finger 1 */
63 #define TMA1217_FINGER2_X_HIGHER8 0x1E /* Higher 8 bit of X coordinate */
64 #define TMA1217_FINGER2_Y_HIGHER8 0x1F /* Higher 8 bit of Y coordinate */
65 #define TMA1217_FINGER2_XY_LOWER4 0x20 /* Lower 4 bits of X and Y */
66 #define TMA1217_FINGER2_Z_VALUE 0x22 /* 8 bit Z value for finger 2 */
67 #define TMA1217_DEVICE_CTRL 0x23 /* Device Control */
68 #define TMA1217_INTERRUPT_ENABLE 0x24 /* Interrupt Enable */
69 #define TMA1217_REPORT_MODE 0x2B /* Reporting Mode */
70 #define TMA1217_MAX_X_LOWER8 0x31 /* Bit 0-7 for Max X */
71 #define TMA1217_MAX_X_HIGHER4 0x32 /* Bit 8-11 for Max X */
72 #define TMA1217_MAX_Y_LOWER8 0x33 /* Bit 0-7 for Max Y */
73 #define TMA1217_MAX_Y_HIGHER4 0x34 /* Bit 8-11 for Max Y */
74 #define TMA1217_DEVICE_CMD_RESET 0x67 /* Device CMD reg for reset */
75 #define TMA1217_DEVICE_CMD_REZERO 0x69 /* Device CMD reg for rezero */
76
77 #define TMA1217_MANUFACTURER_ID 0x73 /* Manufacturer Id */
78 #define TMA1217_PRODUCT_FAMILY 0x75 /* Product Family */
79 #define TMA1217_FIRMWARE_REVISION 0x76 /* Firmware Revision */
80 #define TMA1217_SERIAL_NO_HIGH 0x7C /* Bit 8-15 of device serial no. */
81 #define TMA1217_SERIAL_NO_LOW 0x7D /* Bit 0-7 of device serial no. */
82 #define TMA1217_PRODUCT_ID_START 0x7E /* Start address for 10 byte ID */
83 #define TMA1217_DEVICE_CAPABILITY 0x8B /* Reporting capability */
84
85
86 /*
87 * The touch position structure.
88 */
89 struct touch_state {
90 int x;
91 int y;
92 bool button;
93 };
94
95 /* Device Specific info given by the controller */
96 struct cp_dev_info {
97 u16 maxX;
98 u16 maxY;
99 };
100
101 /* Vendor related info given by the controller */
102 struct cp_vendor_info {
103 u8 vendor_id;
104 u8 product_family;
105 u8 firmware_rev;
106 u16 serial_no;
107 };
108
109 /*
110 * Private structure to store the device details
111 */
112 struct cp_tm1217_device {
113 struct i2c_client *client;
114 struct device *dev;
115 struct cp_vendor_info vinfo;
116 struct cp_dev_info dinfo;
117 struct input_dev_info {
118 char phys[32];
119 char name[128];
120 struct input_dev *input;
121 struct touch_state touch;
122 } cp_input_info[MAX_TOUCH_SUPPORTED];
123
124 int thread_running;
125 struct mutex thread_mutex;
126
127 int gpio;
128 };
129
130
131 /* The following functions are used to read/write registers on the device
132 * as per the RMI prorocol. Technically, a page select should be written
133 * before doing read/write but since the register offsets are below 0xFF
134 * we can use the default value of page which is 0x00
135 */
cp_tm1217_read(struct cp_tm1217_device * ts,u8 * req,int size)136 static int cp_tm1217_read(struct cp_tm1217_device *ts,
137 u8 *req, int size)
138 {
139 int i, retval;
140
141 /* Send the address */
142 retval = i2c_master_send(ts->client, &req[0], 1);
143 if (retval != 1) {
144 dev_err(ts->dev, "cp_tm1217: I2C send failed\n");
145 return retval;
146 }
147 msleep(WAIT_FOR_RESPONSE);
148 for (i = 0; i < MAX_RETRIES; i++) {
149 retval = i2c_master_recv(ts->client, &req[1], size);
150 if (retval == size) {
151 break;
152 } else {
153 msleep(INCREMENTAL_DELAY);
154 dev_dbg(ts->dev, "cp_tm1217: Retry count is %d\n", i);
155 }
156 }
157 if (retval != size)
158 dev_err(ts->dev, "cp_tm1217: Read from device failed\n");
159
160 return retval;
161 }
162
cp_tm1217_write(struct cp_tm1217_device * ts,u8 * req,int size)163 static int cp_tm1217_write(struct cp_tm1217_device *ts,
164 u8 *req, int size)
165 {
166 int retval;
167
168 /* Send the address and the data to be written */
169 retval = i2c_master_send(ts->client, &req[0], size + 1);
170 if (retval != size + 1) {
171 dev_err(ts->dev, "cp_tm1217: I2C write failed: %d\n", retval);
172 return retval;
173 }
174 /* Wait for the write to complete. TBD why this is required */
175 msleep(WAIT_FOR_RESPONSE);
176
177 return size;
178 }
179
cp_tm1217_mask_interrupt(struct cp_tm1217_device * ts)180 static int cp_tm1217_mask_interrupt(struct cp_tm1217_device *ts)
181 {
182 u8 req[2];
183 int retval;
184
185 req[0] = TMA1217_INTERRUPT_ENABLE;
186 req[1] = 0x0;
187 retval = cp_tm1217_write(ts, req, 1);
188 if (retval != 1)
189 return -EIO;
190
191 return 0;
192 }
193
cp_tm1217_unmask_interrupt(struct cp_tm1217_device * ts)194 static int cp_tm1217_unmask_interrupt(struct cp_tm1217_device *ts)
195 {
196 u8 req[2];
197 int retval;
198
199 req[0] = TMA1217_INTERRUPT_ENABLE;
200 req[1] = 0xa;
201 retval = cp_tm1217_write(ts, req, 1);
202 if (retval != 1)
203 return -EIO;
204
205 return 0;
206 }
207
process_touch(struct cp_tm1217_device * ts,int index)208 static void process_touch(struct cp_tm1217_device *ts, int index)
209 {
210 int retval;
211 struct input_dev_info *input_info =
212 (struct input_dev_info *)&ts->cp_input_info[index];
213 u8 xy_data[6];
214
215 if (index == 0)
216 xy_data[0] = TMA1217_FINGER1_X_HIGHER8;
217 else
218 xy_data[0] = TMA1217_FINGER2_X_HIGHER8;
219
220 retval = cp_tm1217_read(ts, xy_data, 5);
221 if (retval < 5) {
222 dev_err(ts->dev, "cp_tm1217: XY read from device failed\n");
223 return;
224 }
225
226 /* Note: Currently not using the Z values but may be requried in
227 the future. */
228 input_info->touch.x = (xy_data[1] << 4)
229 | (xy_data[3] & 0x0F);
230 input_info->touch.y = (xy_data[2] << 4)
231 | ((xy_data[3] & 0xF0) >> 4);
232 input_report_abs(input_info->input, ABS_X, input_info->touch.x);
233 input_report_abs(input_info->input, ABS_Y, input_info->touch.y);
234 input_sync(input_info->input);
235 }
236
cp_tm1217_get_data(struct cp_tm1217_device * ts)237 static void cp_tm1217_get_data(struct cp_tm1217_device *ts)
238 {
239 u8 req[2];
240 int retval, i, finger_touched = 0;
241
242 do {
243 req[0] = TMA1217_FINGER_STATE;
244 retval = cp_tm1217_read(ts, req, 1);
245 if (retval != 1) {
246 dev_err(ts->dev,
247 "cp_tm1217: Read from device failed\n");
248 continue;
249 }
250 finger_touched = 0;
251 /* Start sampling until the pressure is below
252 threshold */
253 for (i = 0; i < TOUCH_SUPPORTED; i++) {
254 if (req[1] & 0x3) {
255 finger_touched++;
256 if (ts->cp_input_info[i].touch.button == 0) {
257 /* send the button touch event */
258 input_report_key(
259 ts->cp_input_info[i].input,
260 BTN_TOUCH, 1);
261 ts->cp_input_info[i].touch.button = 1;
262 }
263 process_touch(ts, i);
264 } else {
265 if (ts->cp_input_info[i].touch.button == 1) {
266 /* send the button release event */
267 input_report_key(
268 ts->cp_input_info[i].input,
269 BTN_TOUCH, 0);
270 input_sync(ts->cp_input_info[i].input);
271 ts->cp_input_info[i].touch.button = 0;
272 }
273 }
274 req[1] = req[1] >> 2;
275 }
276 msleep(DELAY_BTWIN_SAMPLE);
277 } while (finger_touched > 0);
278 }
279
cp_tm1217_sample_thread(int irq,void * handle)280 static irqreturn_t cp_tm1217_sample_thread(int irq, void *handle)
281 {
282 struct cp_tm1217_device *ts = (struct cp_tm1217_device *) handle;
283 u8 req[2];
284 int retval;
285
286 /* Chedk if another thread is already running */
287 mutex_lock(&ts->thread_mutex);
288 if (ts->thread_running == 1) {
289 mutex_unlock(&ts->thread_mutex);
290 return IRQ_HANDLED;
291 } else {
292 ts->thread_running = 1;
293 mutex_unlock(&ts->thread_mutex);
294 }
295
296 /* Mask the interrupts */
297 retval = cp_tm1217_mask_interrupt(ts);
298
299 /* Read the Interrupt Status register to find the cause of the
300 Interrupt */
301 req[0] = TMA1217_INT_STATUS;
302 retval = cp_tm1217_read(ts, req, 1);
303 if (retval != 1)
304 goto exit_thread;
305
306 if (!(req[1] & 0x8))
307 goto exit_thread;
308
309 cp_tm1217_get_data(ts);
310
311 exit_thread:
312 /* Unmask the interrupts before going to sleep */
313 retval = cp_tm1217_unmask_interrupt(ts);
314
315 mutex_lock(&ts->thread_mutex);
316 ts->thread_running = 0;
317 mutex_unlock(&ts->thread_mutex);
318
319 return IRQ_HANDLED;
320 }
321
cp_tm1217_init_data(struct cp_tm1217_device * ts)322 static int cp_tm1217_init_data(struct cp_tm1217_device *ts)
323 {
324 int retval;
325 u8 req[2];
326
327 /* Read the vendor id/ fw revision etc. Ignoring return check as this
328 is non critical info */
329 req[0] = TMA1217_MANUFACTURER_ID;
330 retval = cp_tm1217_read(ts, req, 1);
331 ts->vinfo.vendor_id = req[1];
332
333 req[0] = TMA1217_PRODUCT_FAMILY;
334 retval = cp_tm1217_read(ts, req, 1);
335 ts->vinfo.product_family = req[1];
336
337 req[0] = TMA1217_FIRMWARE_REVISION;
338 retval = cp_tm1217_read(ts, req, 1);
339 ts->vinfo.firmware_rev = req[1];
340
341 req[0] = TMA1217_SERIAL_NO_HIGH;
342 retval = cp_tm1217_read(ts, req, 1);
343 ts->vinfo.serial_no = (req[1] << 8);
344
345 req[0] = TMA1217_SERIAL_NO_LOW;
346 retval = cp_tm1217_read(ts, req, 1);
347 ts->vinfo.serial_no = ts->vinfo.serial_no | req[1];
348
349 req[0] = TMA1217_MAX_X_HIGHER4;
350 retval = cp_tm1217_read(ts, req, 1);
351 ts->dinfo.maxX = (req[1] & 0xF) << 8;
352
353 req[0] = TMA1217_MAX_X_LOWER8;
354 retval = cp_tm1217_read(ts, req, 1);
355 ts->dinfo.maxX = ts->dinfo.maxX | req[1];
356
357 req[0] = TMA1217_MAX_Y_HIGHER4;
358 retval = cp_tm1217_read(ts, req, 1);
359 ts->dinfo.maxY = (req[1] & 0xF) << 8;
360
361 req[0] = TMA1217_MAX_Y_LOWER8;
362 retval = cp_tm1217_read(ts, req, 1);
363 ts->dinfo.maxY = ts->dinfo.maxY | req[1];
364
365 return 0;
366
367 }
368
369 /*
370 * Set up a GPIO for use as the interrupt. We can't simply do this at
371 * boot time because the GPIO drivers themselves may not be around at
372 * boot/firmware set up time to do the work. Instead defer it to driver
373 * detection.
374 */
375
cp_tm1217_setup_gpio_irq(struct cp_tm1217_device * ts)376 static int cp_tm1217_setup_gpio_irq(struct cp_tm1217_device *ts)
377 {
378 int retval;
379
380 /* Hook up the irq handler */
381 retval = gpio_request(ts->gpio, "cp_tm1217_touch");
382 if (retval < 0) {
383 dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
384 retval);
385 return retval;
386 }
387
388 retval = gpio_direction_input(ts->gpio);
389 if (retval < 0) {
390 dev_err(ts->dev,
391 "cp_tm1217: GPIO direction configuration failed, error %d\n",
392 retval);
393 gpio_free(ts->gpio);
394 return retval;
395 }
396
397 retval = gpio_to_irq(ts->gpio);
398 if (retval < 0) {
399 dev_err(ts->dev, "cp_tm1217: GPIO to IRQ failedi,"
400 " error %d\n", retval);
401 gpio_free(ts->gpio);
402 }
403 dev_dbg(ts->dev,
404 "cp_tm1217: Got IRQ number is %d for GPIO %d\n",
405 retval, ts->gpio);
406 return retval;
407 }
408
cp_tm1217_probe(struct i2c_client * client,const struct i2c_device_id * id)409 static int cp_tm1217_probe(struct i2c_client *client,
410 const struct i2c_device_id *id)
411 {
412 struct cp_tm1217_device *ts;
413 struct input_dev *input_dev;
414 struct input_dev_info *input_info;
415 struct cp_tm1217_platform_data *pdata;
416 u8 req[2];
417 int i, retval;
418
419 /* No pdata is fine - we then use "normal" IRQ mode */
420
421 pdata = client->dev.platform_data;
422
423 ts = kzalloc(sizeof(struct cp_tm1217_device), GFP_KERNEL);
424 if (!ts) {
425 dev_err(&client->dev,
426 "cp_tm1217: Private Device Struct alloc failed\n");
427 return -ENOMEM;
428 }
429
430 ts->client = client;
431 ts->dev = &client->dev;
432 i2c_set_clientdata(client, ts);
433
434 ts->thread_running = 0;
435 mutex_init(&ts->thread_mutex);
436
437 /* Reset the Controller */
438 req[0] = TMA1217_DEVICE_CMD_RESET;
439 req[1] = 0x1;
440 retval = cp_tm1217_write(ts, req, 1);
441 if (retval != 1) {
442 dev_err(ts->dev, "cp_tm1217: Controller reset failed\n");
443 kfree(ts);
444 return -EIO;
445 }
446
447 /* Clear up the interrupt status from reset. */
448 req[0] = TMA1217_INT_STATUS;
449 retval = cp_tm1217_read(ts, req, 1);
450
451 /* Mask all the interrupts */
452 retval = cp_tm1217_mask_interrupt(ts);
453
454 /* Read the controller information */
455 cp_tm1217_init_data(ts);
456
457 /* The following code will register multiple event devices when
458 multi-pointer is enabled, the code has not been tested
459 with MPX */
460 for (i = 0; i < TOUCH_SUPPORTED; i++) {
461 input_dev = input_allocate_device();
462 if (input_dev == NULL) {
463 dev_err(ts->dev,
464 "cp_tm1217:Input Device Struct alloc failed\n");
465 retval = -ENOMEM;
466 goto fail;
467 }
468 input_info = &ts->cp_input_info[i];
469 snprintf(input_info->name, sizeof(input_info->name),
470 "cp_tm1217_touchscreen_%d", i);
471 input_dev->name = input_info->name;
472 snprintf(input_info->phys, sizeof(input_info->phys),
473 "%s/input%d", dev_name(&client->dev), i);
474
475 input_dev->phys = input_info->phys;
476 input_dev->id.bustype = BUS_I2C;
477
478 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
479 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
480
481 input_set_abs_params(input_dev, ABS_X, 0, ts->dinfo.maxX, 0, 0);
482 input_set_abs_params(input_dev, ABS_Y, 0, ts->dinfo.maxY, 0, 0);
483
484 retval = input_register_device(input_dev);
485 if (retval) {
486 dev_err(ts->dev,
487 "Input dev registration failed for %s\n",
488 input_dev->name);
489 input_free_device(input_dev);
490 goto fail;
491 }
492 input_info->input = input_dev;
493 }
494
495 /* Setup the reporting mode to send an interrupt only when
496 finger arrives or departs. */
497 req[0] = TMA1217_REPORT_MODE;
498 req[1] = 0x02;
499 retval = cp_tm1217_write(ts, req, 1);
500
501 /* Setup the device to no sleep mode for now and make it configured */
502 req[0] = TMA1217_DEVICE_CTRL;
503 req[1] = 0x84;
504 retval = cp_tm1217_write(ts, req, 1);
505
506 /* Check for the status of the device */
507 req[0] = TMA1217_DEV_STATUS;
508 retval = cp_tm1217_read(ts, req, 1);
509 if (req[1] != 0) {
510 dev_err(ts->dev,
511 "cp_tm1217: Device Status 0x%x != 0: config failed\n",
512 req[1]);
513
514 retval = -EIO;
515 goto fail;
516 }
517
518 if (pdata && pdata->gpio) {
519 ts->gpio = pdata->gpio;
520 retval = cp_tm1217_setup_gpio_irq(ts);
521 } else
522 retval = client->irq;
523
524 if (retval < 0) {
525 dev_err(ts->dev, "cp_tm1217: GPIO request failed error %d\n",
526 retval);
527 goto fail;
528 }
529
530 client->irq = retval;
531
532
533 retval = request_threaded_irq(client->irq,
534 NULL, cp_tm1217_sample_thread,
535 IRQF_TRIGGER_FALLING, "cp_tm1217_touch", ts);
536 if (retval < 0) {
537 dev_err(ts->dev, "cp_tm1217: Request IRQ error %d\n", retval);
538 goto fail_gpio;
539 }
540
541 /* Unmask the interrupts */
542 retval = cp_tm1217_unmask_interrupt(ts);
543 if (retval == 0)
544 return 0;
545
546 free_irq(client->irq, ts);
547 fail_gpio:
548 if (ts->gpio)
549 gpio_free(ts->gpio);
550 fail:
551 /* Clean up before returning failure */
552 for (i = 0; i < TOUCH_SUPPORTED; i++) {
553 if (ts->cp_input_info[i].input) {
554 input_unregister_device(ts->cp_input_info[i].input);
555 input_free_device(ts->cp_input_info[i].input);
556 }
557 }
558 kfree(ts);
559 return retval;
560
561 }
562
563 /*
564 * cp_tm1217 suspend
565 *
566 */
cp_tm1217_suspend(struct i2c_client * client,pm_message_t mesg)567 static int cp_tm1217_suspend(struct i2c_client *client, pm_message_t mesg)
568 {
569 struct cp_tm1217_device *ts = i2c_get_clientdata(client);
570 u8 req[2];
571 int retval;
572
573 /* Put the controller to sleep */
574 req[0] = TMA1217_DEVICE_CTRL;
575 retval = cp_tm1217_read(ts, req, 1);
576 req[1] = (req[1] & 0xF8) | 0x1;
577 retval = cp_tm1217_write(ts, req, 1);
578
579 if (device_may_wakeup(&client->dev))
580 enable_irq_wake(client->irq);
581
582 return 0;
583 }
584
585 /*
586 * cp_tm1217_resume
587 *
588 */
cp_tm1217_resume(struct i2c_client * client)589 static int cp_tm1217_resume(struct i2c_client *client)
590 {
591 struct cp_tm1217_device *ts = i2c_get_clientdata(client);
592 u8 req[2];
593 int retval;
594
595 /* Take the controller out of sleep */
596 req[0] = TMA1217_DEVICE_CTRL;
597 retval = cp_tm1217_read(ts, req, 1);
598 req[1] = (req[1] & 0xF8) | 0x4;
599 retval = cp_tm1217_write(ts, req, 1);
600
601 /* Restore the register settings sinc the power to the
602 could have been cut off */
603
604 /* Setup the reporting mode to send an interrupt only when
605 finger arrives or departs. */
606 req[0] = TMA1217_REPORT_MODE;
607 req[1] = 0x02;
608 retval = cp_tm1217_write(ts, req, 1);
609
610 /* Setup the device to no sleep mode for now and make it configured */
611 req[0] = TMA1217_DEVICE_CTRL;
612 req[1] = 0x84;
613 retval = cp_tm1217_write(ts, req, 1);
614
615 /* Setup the interrupt mask */
616 retval = cp_tm1217_unmask_interrupt(ts);
617
618 if (device_may_wakeup(&client->dev))
619 disable_irq_wake(client->irq);
620
621 return 0;
622 }
623
624 /*
625 * cp_tm1217_remove
626 *
627 */
cp_tm1217_remove(struct i2c_client * client)628 static int cp_tm1217_remove(struct i2c_client *client)
629 {
630 struct cp_tm1217_device *ts = i2c_get_clientdata(client);
631 int i;
632
633 free_irq(client->irq, ts);
634 if (ts->gpio)
635 gpio_free(ts->gpio);
636 for (i = 0; i < TOUCH_SUPPORTED; i++)
637 input_unregister_device(ts->cp_input_info[i].input);
638 kfree(ts);
639 return 0;
640 }
641
642 static struct i2c_device_id cp_tm1217_idtable[] = {
643 { CPTM1217_DEVICE_NAME, 0 },
644 { }
645 };
646
647 MODULE_DEVICE_TABLE(i2c, cp_tm1217_idtable);
648
649 static struct i2c_driver cp_tm1217_driver = {
650 .driver = {
651 .owner = THIS_MODULE,
652 .name = CPTM1217_DRIVER_NAME,
653 },
654 .id_table = cp_tm1217_idtable,
655 .probe = cp_tm1217_probe,
656 .remove = cp_tm1217_remove,
657 .suspend = cp_tm1217_suspend,
658 .resume = cp_tm1217_resume,
659 };
660
clearpad_tm1217_init(void)661 static int __init clearpad_tm1217_init(void)
662 {
663 return i2c_add_driver(&cp_tm1217_driver);
664 }
665
clearpad_tm1217_exit(void)666 static void __exit clearpad_tm1217_exit(void)
667 {
668 i2c_del_driver(&cp_tm1217_driver);
669 }
670
671 module_init(clearpad_tm1217_init);
672 module_exit(clearpad_tm1217_exit);
673
674 MODULE_AUTHOR("Ramesh Agarwal <ramesh.agarwal@intel.com>");
675 MODULE_DESCRIPTION("Synaptics TM1217 TouchScreen Driver");
676 MODULE_LICENSE("GPL v2");
677