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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * qt2160.c - Atmel AT42QT2160 Touch Sense Controller
4 *
5 * Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
6 */
7
8#include <linux/kernel.h>
9#include <linux/leds.h>
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/jiffies.h>
13#include <linux/i2c.h>
14#include <linux/irq.h>
15#include <linux/interrupt.h>
16#include <linux/input.h>
17
18#define QT2160_VALID_CHIPID 0x11
19
20#define QT2160_CMD_CHIPID 0
21#define QT2160_CMD_CODEVER 1
22#define QT2160_CMD_GSTAT 2
23#define QT2160_CMD_KEYS3 3
24#define QT2160_CMD_KEYS4 4
25#define QT2160_CMD_SLIDE 5
26#define QT2160_CMD_GPIOS 6
27#define QT2160_CMD_SUBVER 7
28#define QT2160_CMD_CALIBRATE 10
29#define QT2160_CMD_DRIVE_X 70
30#define QT2160_CMD_PWMEN_X 74
31#define QT2160_CMD_PWM_DUTY 76
32
33#define QT2160_NUM_LEDS_X 8
34
35#define QT2160_CYCLE_INTERVAL (2*HZ)
36
37static unsigned char qt2160_key2code[] = {
38 KEY_0, KEY_1, KEY_2, KEY_3,
39 KEY_4, KEY_5, KEY_6, KEY_7,
40 KEY_8, KEY_9, KEY_A, KEY_B,
41 KEY_C, KEY_D, KEY_E, KEY_F,
42};
43
44#ifdef CONFIG_LEDS_CLASS
45struct qt2160_led {
46 struct qt2160_data *qt2160;
47 struct led_classdev cdev;
48 char name[32];
49 int id;
50 enum led_brightness brightness;
51};
52#endif
53
54struct qt2160_data {
55 struct i2c_client *client;
56 struct input_dev *input;
57 struct delayed_work dwork;
58 unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
59 u16 key_matrix;
60#ifdef CONFIG_LEDS_CLASS
61 struct qt2160_led leds[QT2160_NUM_LEDS_X];
62#endif
63};
64
65static int qt2160_read(struct i2c_client *client, u8 reg);
66static int qt2160_write(struct i2c_client *client, u8 reg, u8 data);
67
68#ifdef CONFIG_LEDS_CLASS
69
70static int qt2160_led_set(struct led_classdev *cdev,
71 enum led_brightness value)
72{
73 struct qt2160_led *led = container_of(cdev, struct qt2160_led, cdev);
74 struct qt2160_data *qt2160 = led->qt2160;
75 struct i2c_client *client = qt2160->client;
76 u32 drive, pwmen;
77
78 if (value != led->brightness) {
79 drive = qt2160_read(client, QT2160_CMD_DRIVE_X);
80 pwmen = qt2160_read(client, QT2160_CMD_PWMEN_X);
81 if (value != LED_OFF) {
82 drive |= BIT(led->id);
83 pwmen |= BIT(led->id);
84
85 } else {
86 drive &= ~BIT(led->id);
87 pwmen &= ~BIT(led->id);
88 }
89 qt2160_write(client, QT2160_CMD_DRIVE_X, drive);
90 qt2160_write(client, QT2160_CMD_PWMEN_X, pwmen);
91
92 /*
93 * Changing this register will change the brightness
94 * of every LED in the qt2160. It's a HW limitation.
95 */
96 if (value != LED_OFF)
97 qt2160_write(client, QT2160_CMD_PWM_DUTY, value);
98
99 led->brightness = value;
100 }
101
102 return 0;
103}
104
105#endif /* CONFIG_LEDS_CLASS */
106
107static int qt2160_read_block(struct i2c_client *client,
108 u8 inireg, u8 *buffer, unsigned int count)
109{
110 int error, idx = 0;
111
112 /*
113 * Can't use SMBus block data read. Check for I2C functionality to speed
114 * things up whenever possible. Otherwise we will be forced to read
115 * sequentially.
116 */
117 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
118
119 error = i2c_smbus_write_byte(client, inireg + idx);
120 if (error) {
121 dev_err(&client->dev,
122 "couldn't send request. Returned %d\n", error);
123 return error;
124 }
125
126 error = i2c_master_recv(client, buffer, count);
127 if (error != count) {
128 dev_err(&client->dev,
129 "couldn't read registers. Returned %d bytes\n", error);
130 return error;
131 }
132 } else {
133
134 while (count--) {
135 int data;
136
137 error = i2c_smbus_write_byte(client, inireg + idx);
138 if (error) {
139 dev_err(&client->dev,
140 "couldn't send request. Returned %d\n", error);
141 return error;
142 }
143
144 data = i2c_smbus_read_byte(client);
145 if (data < 0) {
146 dev_err(&client->dev,
147 "couldn't read register. Returned %d\n", data);
148 return data;
149 }
150
151 buffer[idx++] = data;
152 }
153 }
154
155 return 0;
156}
157
158static int qt2160_get_key_matrix(struct qt2160_data *qt2160)
159{
160 struct i2c_client *client = qt2160->client;
161 struct input_dev *input = qt2160->input;
162 u8 regs[6];
163 u16 old_matrix, new_matrix;
164 int ret, i, mask;
165
166 dev_dbg(&client->dev, "requesting keys...\n");
167
168 /*
169 * Read all registers from General Status Register
170 * to GPIOs register
171 */
172 ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6);
173 if (ret) {
174 dev_err(&client->dev,
175 "could not perform chip read.\n");
176 return ret;
177 }
178
179 old_matrix = qt2160->key_matrix;
180 qt2160->key_matrix = new_matrix = (regs[2] << 8) | regs[1];
181
182 mask = 0x01;
183 for (i = 0; i < 16; ++i, mask <<= 1) {
184 int keyval = new_matrix & mask;
185
186 if ((old_matrix & mask) != keyval) {
187 input_report_key(input, qt2160->keycodes[i], keyval);
188 dev_dbg(&client->dev, "key %d %s\n",
189 i, keyval ? "pressed" : "released");
190 }
191 }
192
193 input_sync(input);
194
195 return 0;
196}
197
198static irqreturn_t qt2160_irq(int irq, void *_qt2160)
199{
200 struct qt2160_data *qt2160 = _qt2160;
201
202 mod_delayed_work(system_wq, &qt2160->dwork, 0);
203
204 return IRQ_HANDLED;
205}
206
207static void qt2160_schedule_read(struct qt2160_data *qt2160)
208{
209 schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
210}
211
212static void qt2160_worker(struct work_struct *work)
213{
214 struct qt2160_data *qt2160 =
215 container_of(work, struct qt2160_data, dwork.work);
216
217 dev_dbg(&qt2160->client->dev, "worker\n");
218
219 qt2160_get_key_matrix(qt2160);
220
221 /* Avoid device lock up by checking every so often */
222 qt2160_schedule_read(qt2160);
223}
224
225static int qt2160_read(struct i2c_client *client, u8 reg)
226{
227 int ret;
228
229 ret = i2c_smbus_write_byte(client, reg);
230 if (ret) {
231 dev_err(&client->dev,
232 "couldn't send request. Returned %d\n", ret);
233 return ret;
234 }
235
236 ret = i2c_smbus_read_byte(client);
237 if (ret < 0) {
238 dev_err(&client->dev,
239 "couldn't read register. Returned %d\n", ret);
240 return ret;
241 }
242
243 return ret;
244}
245
246static int qt2160_write(struct i2c_client *client, u8 reg, u8 data)
247{
248 int ret;
249
250 ret = i2c_smbus_write_byte_data(client, reg, data);
251 if (ret < 0)
252 dev_err(&client->dev,
253 "couldn't write data. Returned %d\n", ret);
254
255 return ret;
256}
257
258#ifdef CONFIG_LEDS_CLASS
259
260static int qt2160_register_leds(struct qt2160_data *qt2160)
261{
262 struct i2c_client *client = qt2160->client;
263 int ret;
264 int i;
265
266 for (i = 0; i < QT2160_NUM_LEDS_X; i++) {
267 struct qt2160_led *led = &qt2160->leds[i];
268
269 snprintf(led->name, sizeof(led->name), "qt2160:x%d", i);
270 led->cdev.name = led->name;
271 led->cdev.brightness_set_blocking = qt2160_led_set;
272 led->cdev.brightness = LED_OFF;
273 led->id = i;
274 led->qt2160 = qt2160;
275
276 ret = led_classdev_register(&client->dev, &led->cdev);
277 if (ret < 0)
278 return ret;
279 }
280
281 /* Tur off LEDs */
282 qt2160_write(client, QT2160_CMD_DRIVE_X, 0);
283 qt2160_write(client, QT2160_CMD_PWMEN_X, 0);
284 qt2160_write(client, QT2160_CMD_PWM_DUTY, 0);
285
286 return 0;
287}
288
289static void qt2160_unregister_leds(struct qt2160_data *qt2160)
290{
291 int i;
292
293 for (i = 0; i < QT2160_NUM_LEDS_X; i++)
294 led_classdev_unregister(&qt2160->leds[i].cdev);
295}
296
297#else
298
299static inline int qt2160_register_leds(struct qt2160_data *qt2160)
300{
301 return 0;
302}
303
304static inline void qt2160_unregister_leds(struct qt2160_data *qt2160)
305{
306}
307
308#endif
309
310static bool qt2160_identify(struct i2c_client *client)
311{
312 int id, ver, rev;
313
314 /* Read Chid ID to check if chip is valid */
315 id = qt2160_read(client, QT2160_CMD_CHIPID);
316 if (id != QT2160_VALID_CHIPID) {
317 dev_err(&client->dev, "ID %d not supported\n", id);
318 return false;
319 }
320
321 /* Read chip firmware version */
322 ver = qt2160_read(client, QT2160_CMD_CODEVER);
323 if (ver < 0) {
324 dev_err(&client->dev, "could not get firmware version\n");
325 return false;
326 }
327
328 /* Read chip firmware revision */
329 rev = qt2160_read(client, QT2160_CMD_SUBVER);
330 if (rev < 0) {
331 dev_err(&client->dev, "could not get firmware revision\n");
332 return false;
333 }
334
335 dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
336 ver >> 4, ver & 0xf, rev);
337
338 return true;
339}
340
341static int qt2160_probe(struct i2c_client *client)
342{
343 struct qt2160_data *qt2160;
344 struct input_dev *input;
345 int i;
346 int error;
347
348 /* Check functionality */
349 error = i2c_check_functionality(client->adapter,
350 I2C_FUNC_SMBUS_BYTE);
351 if (!error) {
352 dev_err(&client->dev, "%s adapter not supported\n",
353 dev_driver_string(&client->adapter->dev));
354 return -ENODEV;
355 }
356
357 if (!qt2160_identify(client))
358 return -ENODEV;
359
360 /* Chip is valid and active. Allocate structure */
361 qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
362 input = input_allocate_device();
363 if (!qt2160 || !input) {
364 dev_err(&client->dev, "insufficient memory\n");
365 error = -ENOMEM;
366 goto err_free_mem;
367 }
368
369 qt2160->client = client;
370 qt2160->input = input;
371 INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
372
373 input->name = "AT42QT2160 Touch Sense Keyboard";
374 input->id.bustype = BUS_I2C;
375
376 input->keycode = qt2160->keycodes;
377 input->keycodesize = sizeof(qt2160->keycodes[0]);
378 input->keycodemax = ARRAY_SIZE(qt2160_key2code);
379
380 __set_bit(EV_KEY, input->evbit);
381 __clear_bit(EV_REP, input->evbit);
382 for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
383 qt2160->keycodes[i] = qt2160_key2code[i];
384 __set_bit(qt2160_key2code[i], input->keybit);
385 }
386 __clear_bit(KEY_RESERVED, input->keybit);
387
388 /* Calibrate device */
389 error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
390 if (error) {
391 dev_err(&client->dev, "failed to calibrate device\n");
392 goto err_free_mem;
393 }
394
395 if (client->irq) {
396 error = request_irq(client->irq, qt2160_irq,
397 IRQF_TRIGGER_FALLING, "qt2160", qt2160);
398 if (error) {
399 dev_err(&client->dev,
400 "failed to allocate irq %d\n", client->irq);
401 goto err_free_mem;
402 }
403 }
404
405 error = qt2160_register_leds(qt2160);
406 if (error) {
407 dev_err(&client->dev, "Failed to register leds\n");
408 goto err_free_irq;
409 }
410
411 error = input_register_device(qt2160->input);
412 if (error) {
413 dev_err(&client->dev,
414 "Failed to register input device\n");
415 goto err_unregister_leds;
416 }
417
418 i2c_set_clientdata(client, qt2160);
419 qt2160_schedule_read(qt2160);
420
421 return 0;
422
423err_unregister_leds:
424 qt2160_unregister_leds(qt2160);
425err_free_irq:
426 if (client->irq)
427 free_irq(client->irq, qt2160);
428err_free_mem:
429 input_free_device(input);
430 kfree(qt2160);
431 return error;
432}
433
434static void qt2160_remove(struct i2c_client *client)
435{
436 struct qt2160_data *qt2160 = i2c_get_clientdata(client);
437
438 qt2160_unregister_leds(qt2160);
439
440 /* Release IRQ so no queue will be scheduled */
441 if (client->irq)
442 free_irq(client->irq, qt2160);
443
444 cancel_delayed_work_sync(&qt2160->dwork);
445
446 input_unregister_device(qt2160->input);
447 kfree(qt2160);
448}
449
450static const struct i2c_device_id qt2160_idtable[] = {
451 { "qt2160", 0, },
452 { }
453};
454
455MODULE_DEVICE_TABLE(i2c, qt2160_idtable);
456
457static struct i2c_driver qt2160_driver = {
458 .driver = {
459 .name = "qt2160",
460 },
461
462 .id_table = qt2160_idtable,
463 .probe_new = qt2160_probe,
464 .remove = qt2160_remove,
465};
466
467module_i2c_driver(qt2160_driver);
468
469MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
470MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
471MODULE_LICENSE("GPL");
1/*
2 * qt2160.c - Atmel AT42QT2160 Touch Sense Controller
3 *
4 * Copyright (C) 2009 Raphael Derosso Pereira <raphaelpereira@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21#include <linux/kernel.h>
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/jiffies.h>
26#include <linux/i2c.h>
27#include <linux/irq.h>
28#include <linux/interrupt.h>
29#include <linux/input.h>
30
31#define QT2160_VALID_CHIPID 0x11
32
33#define QT2160_CMD_CHIPID 0
34#define QT2160_CMD_CODEVER 1
35#define QT2160_CMD_GSTAT 2
36#define QT2160_CMD_KEYS3 3
37#define QT2160_CMD_KEYS4 4
38#define QT2160_CMD_SLIDE 5
39#define QT2160_CMD_GPIOS 6
40#define QT2160_CMD_SUBVER 7
41#define QT2160_CMD_CALIBRATE 10
42
43#define QT2160_CYCLE_INTERVAL (2*HZ)
44
45static unsigned char qt2160_key2code[] = {
46 KEY_0, KEY_1, KEY_2, KEY_3,
47 KEY_4, KEY_5, KEY_6, KEY_7,
48 KEY_8, KEY_9, KEY_A, KEY_B,
49 KEY_C, KEY_D, KEY_E, KEY_F,
50};
51
52struct qt2160_data {
53 struct i2c_client *client;
54 struct input_dev *input;
55 struct delayed_work dwork;
56 spinlock_t lock; /* Protects canceling/rescheduling of dwork */
57 unsigned short keycodes[ARRAY_SIZE(qt2160_key2code)];
58 u16 key_matrix;
59};
60
61static int qt2160_read_block(struct i2c_client *client,
62 u8 inireg, u8 *buffer, unsigned int count)
63{
64 int error, idx = 0;
65
66 /*
67 * Can't use SMBus block data read. Check for I2C functionality to speed
68 * things up whenever possible. Otherwise we will be forced to read
69 * sequentially.
70 */
71 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
72
73 error = i2c_smbus_write_byte(client, inireg + idx);
74 if (error) {
75 dev_err(&client->dev,
76 "couldn't send request. Returned %d\n", error);
77 return error;
78 }
79
80 error = i2c_master_recv(client, buffer, count);
81 if (error != count) {
82 dev_err(&client->dev,
83 "couldn't read registers. Returned %d bytes\n", error);
84 return error;
85 }
86 } else {
87
88 while (count--) {
89 int data;
90
91 error = i2c_smbus_write_byte(client, inireg + idx);
92 if (error) {
93 dev_err(&client->dev,
94 "couldn't send request. Returned %d\n", error);
95 return error;
96 }
97
98 data = i2c_smbus_read_byte(client);
99 if (data < 0) {
100 dev_err(&client->dev,
101 "couldn't read register. Returned %d\n", data);
102 return data;
103 }
104
105 buffer[idx++] = data;
106 }
107 }
108
109 return 0;
110}
111
112static int qt2160_get_key_matrix(struct qt2160_data *qt2160)
113{
114 struct i2c_client *client = qt2160->client;
115 struct input_dev *input = qt2160->input;
116 u8 regs[6];
117 u16 old_matrix, new_matrix;
118 int ret, i, mask;
119
120 dev_dbg(&client->dev, "requesting keys...\n");
121
122 /*
123 * Read all registers from General Status Register
124 * to GPIOs register
125 */
126 ret = qt2160_read_block(client, QT2160_CMD_GSTAT, regs, 6);
127 if (ret) {
128 dev_err(&client->dev,
129 "could not perform chip read.\n");
130 return ret;
131 }
132
133 old_matrix = qt2160->key_matrix;
134 qt2160->key_matrix = new_matrix = (regs[2] << 8) | regs[1];
135
136 mask = 0x01;
137 for (i = 0; i < 16; ++i, mask <<= 1) {
138 int keyval = new_matrix & mask;
139
140 if ((old_matrix & mask) != keyval) {
141 input_report_key(input, qt2160->keycodes[i], keyval);
142 dev_dbg(&client->dev, "key %d %s\n",
143 i, keyval ? "pressed" : "released");
144 }
145 }
146
147 input_sync(input);
148
149 return 0;
150}
151
152static irqreturn_t qt2160_irq(int irq, void *_qt2160)
153{
154 struct qt2160_data *qt2160 = _qt2160;
155 unsigned long flags;
156
157 spin_lock_irqsave(&qt2160->lock, flags);
158
159 __cancel_delayed_work(&qt2160->dwork);
160 schedule_delayed_work(&qt2160->dwork, 0);
161
162 spin_unlock_irqrestore(&qt2160->lock, flags);
163
164 return IRQ_HANDLED;
165}
166
167static void qt2160_schedule_read(struct qt2160_data *qt2160)
168{
169 spin_lock_irq(&qt2160->lock);
170 schedule_delayed_work(&qt2160->dwork, QT2160_CYCLE_INTERVAL);
171 spin_unlock_irq(&qt2160->lock);
172}
173
174static void qt2160_worker(struct work_struct *work)
175{
176 struct qt2160_data *qt2160 =
177 container_of(work, struct qt2160_data, dwork.work);
178
179 dev_dbg(&qt2160->client->dev, "worker\n");
180
181 qt2160_get_key_matrix(qt2160);
182
183 /* Avoid device lock up by checking every so often */
184 qt2160_schedule_read(qt2160);
185}
186
187static int __devinit qt2160_read(struct i2c_client *client, u8 reg)
188{
189 int ret;
190
191 ret = i2c_smbus_write_byte(client, reg);
192 if (ret) {
193 dev_err(&client->dev,
194 "couldn't send request. Returned %d\n", ret);
195 return ret;
196 }
197
198 ret = i2c_smbus_read_byte(client);
199 if (ret < 0) {
200 dev_err(&client->dev,
201 "couldn't read register. Returned %d\n", ret);
202 return ret;
203 }
204
205 return ret;
206}
207
208static int __devinit qt2160_write(struct i2c_client *client, u8 reg, u8 data)
209{
210 int error;
211
212 error = i2c_smbus_write_byte(client, reg);
213 if (error) {
214 dev_err(&client->dev,
215 "couldn't send request. Returned %d\n", error);
216 return error;
217 }
218
219 error = i2c_smbus_write_byte(client, data);
220 if (error) {
221 dev_err(&client->dev,
222 "couldn't write data. Returned %d\n", error);
223 return error;
224 }
225
226 return error;
227}
228
229
230static bool __devinit qt2160_identify(struct i2c_client *client)
231{
232 int id, ver, rev;
233
234 /* Read Chid ID to check if chip is valid */
235 id = qt2160_read(client, QT2160_CMD_CHIPID);
236 if (id != QT2160_VALID_CHIPID) {
237 dev_err(&client->dev, "ID %d not supported\n", id);
238 return false;
239 }
240
241 /* Read chip firmware version */
242 ver = qt2160_read(client, QT2160_CMD_CODEVER);
243 if (ver < 0) {
244 dev_err(&client->dev, "could not get firmware version\n");
245 return false;
246 }
247
248 /* Read chip firmware revision */
249 rev = qt2160_read(client, QT2160_CMD_SUBVER);
250 if (rev < 0) {
251 dev_err(&client->dev, "could not get firmware revision\n");
252 return false;
253 }
254
255 dev_info(&client->dev, "AT42QT2160 firmware version %d.%d.%d\n",
256 ver >> 4, ver & 0xf, rev);
257
258 return true;
259}
260
261static int __devinit qt2160_probe(struct i2c_client *client,
262 const struct i2c_device_id *id)
263{
264 struct qt2160_data *qt2160;
265 struct input_dev *input;
266 int i;
267 int error;
268
269 /* Check functionality */
270 error = i2c_check_functionality(client->adapter,
271 I2C_FUNC_SMBUS_BYTE);
272 if (!error) {
273 dev_err(&client->dev, "%s adapter not supported\n",
274 dev_driver_string(&client->adapter->dev));
275 return -ENODEV;
276 }
277
278 if (!qt2160_identify(client))
279 return -ENODEV;
280
281 /* Chip is valid and active. Allocate structure */
282 qt2160 = kzalloc(sizeof(struct qt2160_data), GFP_KERNEL);
283 input = input_allocate_device();
284 if (!qt2160 || !input) {
285 dev_err(&client->dev, "insufficient memory\n");
286 error = -ENOMEM;
287 goto err_free_mem;
288 }
289
290 qt2160->client = client;
291 qt2160->input = input;
292 INIT_DELAYED_WORK(&qt2160->dwork, qt2160_worker);
293 spin_lock_init(&qt2160->lock);
294
295 input->name = "AT42QT2160 Touch Sense Keyboard";
296 input->id.bustype = BUS_I2C;
297
298 input->keycode = qt2160->keycodes;
299 input->keycodesize = sizeof(qt2160->keycodes[0]);
300 input->keycodemax = ARRAY_SIZE(qt2160_key2code);
301
302 __set_bit(EV_KEY, input->evbit);
303 __clear_bit(EV_REP, input->evbit);
304 for (i = 0; i < ARRAY_SIZE(qt2160_key2code); i++) {
305 qt2160->keycodes[i] = qt2160_key2code[i];
306 __set_bit(qt2160_key2code[i], input->keybit);
307 }
308 __clear_bit(KEY_RESERVED, input->keybit);
309
310 /* Calibrate device */
311 error = qt2160_write(client, QT2160_CMD_CALIBRATE, 1);
312 if (error) {
313 dev_err(&client->dev, "failed to calibrate device\n");
314 goto err_free_mem;
315 }
316
317 if (client->irq) {
318 error = request_irq(client->irq, qt2160_irq,
319 IRQF_TRIGGER_FALLING, "qt2160", qt2160);
320 if (error) {
321 dev_err(&client->dev,
322 "failed to allocate irq %d\n", client->irq);
323 goto err_free_mem;
324 }
325 }
326
327 error = input_register_device(qt2160->input);
328 if (error) {
329 dev_err(&client->dev,
330 "Failed to register input device\n");
331 goto err_free_irq;
332 }
333
334 i2c_set_clientdata(client, qt2160);
335 qt2160_schedule_read(qt2160);
336
337 return 0;
338
339err_free_irq:
340 if (client->irq)
341 free_irq(client->irq, qt2160);
342err_free_mem:
343 input_free_device(input);
344 kfree(qt2160);
345 return error;
346}
347
348static int __devexit qt2160_remove(struct i2c_client *client)
349{
350 struct qt2160_data *qt2160 = i2c_get_clientdata(client);
351
352 /* Release IRQ so no queue will be scheduled */
353 if (client->irq)
354 free_irq(client->irq, qt2160);
355
356 cancel_delayed_work_sync(&qt2160->dwork);
357
358 input_unregister_device(qt2160->input);
359 kfree(qt2160);
360
361 return 0;
362}
363
364static const struct i2c_device_id qt2160_idtable[] = {
365 { "qt2160", 0, },
366 { }
367};
368
369MODULE_DEVICE_TABLE(i2c, qt2160_idtable);
370
371static struct i2c_driver qt2160_driver = {
372 .driver = {
373 .name = "qt2160",
374 .owner = THIS_MODULE,
375 },
376
377 .id_table = qt2160_idtable,
378 .probe = qt2160_probe,
379 .remove = __devexit_p(qt2160_remove),
380};
381
382static int __init qt2160_init(void)
383{
384 return i2c_add_driver(&qt2160_driver);
385}
386module_init(qt2160_init);
387
388static void __exit qt2160_cleanup(void)
389{
390 i2c_del_driver(&qt2160_driver);
391}
392module_exit(qt2160_cleanup);
393
394MODULE_AUTHOR("Raphael Derosso Pereira <raphaelpereira@gmail.com>");
395MODULE_DESCRIPTION("Driver for AT42QT2160 Touch Sensor");
396MODULE_LICENSE("GPL");