1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/input.h>
25#include <linux/slab.h>
26#include <linux/interrupt.h>
27#include <linux/io.h>
28#include <linux/i2c.h>
29#include <linux/gpio.h>
30#include <linux/input/cy8ctmg110_pdata.h>
31
32#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
33
34
35#define CY8CTMG110_X_MIN 0
36#define CY8CTMG110_Y_MIN 0
37#define CY8CTMG110_X_MAX 759
38#define CY8CTMG110_Y_MAX 465
39
40
41
42#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
43#define CY8CTMG110_TOUCH_SLEEP_TIME 2
44#define CY8CTMG110_TOUCH_X1 3
45#define CY8CTMG110_TOUCH_Y1 5
46#define CY8CTMG110_TOUCH_X2 7
47#define CY8CTMG110_TOUCH_Y2 9
48#define CY8CTMG110_FINGERS 11
49#define CY8CTMG110_GESTURE 12
50#define CY8CTMG110_REG_MAX 13
51
52
53
54
55
56struct cy8ctmg110 {
57 struct input_dev *input;
58 char phys[32];
59 struct i2c_client *client;
60 int reset_pin;
61 int irq_pin;
62};
63
64
65
66
67
68static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
69{
70 if (ts->reset_pin)
71 gpio_direction_output(ts->reset_pin, 1 - poweron);
72}
73
74static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
75 unsigned char len, unsigned char *value)
76{
77 struct i2c_client *client = tsc->client;
78 int ret;
79 unsigned char i2c_data[6];
80
81 BUG_ON(len > 5);
82
83 i2c_data[0] = reg;
84 memcpy(i2c_data + 1, value, len);
85
86 ret = i2c_master_send(client, i2c_data, len + 1);
87 if (ret != len + 1) {
88 dev_err(&client->dev, "i2c write data cmd failed\n");
89 return ret < 0 ? ret : -EIO;
90 }
91
92 return 0;
93}
94
95static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
96 unsigned char *data, unsigned char len, unsigned char cmd)
97{
98 struct i2c_client *client = tsc->client;
99 int ret;
100 struct i2c_msg msg[2] = {
101
102 { client->addr, 0, 1, &cmd },
103
104 { client->addr, I2C_M_RD, len, data }
105 };
106
107 ret = i2c_transfer(client->adapter, msg, 2);
108 if (ret < 0)
109 return ret;
110
111 return 0;
112}
113
114static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
115{
116 struct input_dev *input = tsc->input;
117 unsigned char reg_p[CY8CTMG110_REG_MAX];
118 int x, y;
119
120 memset(reg_p, 0, CY8CTMG110_REG_MAX);
121
122
123 if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
124 return -EIO;
125
126 y = reg_p[2] << 8 | reg_p[3];
127 x = reg_p[0] << 8 | reg_p[1];
128
129
130 if (reg_p[8] == 0) {
131 input_report_key(input, BTN_TOUCH, 0);
132 } else {
133 input_report_key(input, BTN_TOUCH, 1);
134 input_report_abs(input, ABS_X, x);
135 input_report_abs(input, ABS_Y, y);
136 }
137
138 input_sync(input);
139
140 return 0;
141}
142
143static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
144{
145 unsigned char reg_p[3];
146
147 if (sleep) {
148 reg_p[0] = 0x00;
149 reg_p[1] = 0xff;
150 reg_p[2] = 5;
151 } else {
152 reg_p[0] = 0x10;
153 reg_p[1] = 0xff;
154 reg_p[2] = 0;
155 }
156
157 return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
158}
159
160static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
161{
162 struct cy8ctmg110 *tsc = dev_id;
163
164 cy8ctmg110_touch_pos(tsc);
165
166 return IRQ_HANDLED;
167}
168
169static int __devinit cy8ctmg110_probe(struct i2c_client *client,
170 const struct i2c_device_id *id)
171{
172 const struct cy8ctmg110_pdata *pdata = client->dev.platform_data;
173 struct cy8ctmg110 *ts;
174 struct input_dev *input_dev;
175 int err;
176
177
178 if (pdata == NULL) {
179 dev_err(&client->dev, "no pdata\n");
180 return -ENODEV;
181 }
182
183 if (!i2c_check_functionality(client->adapter,
184 I2C_FUNC_SMBUS_READ_WORD_DATA))
185 return -EIO;
186
187 ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
188 input_dev = input_allocate_device();
189 if (!ts || !input_dev) {
190 err = -ENOMEM;
191 goto err_free_mem;
192 }
193
194 ts->client = client;
195 ts->input = input_dev;
196 ts->reset_pin = pdata->reset_pin;
197 ts->irq_pin = pdata->irq_pin;
198
199 snprintf(ts->phys, sizeof(ts->phys),
200 "%s/input0", dev_name(&client->dev));
201
202 input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
203 input_dev->phys = ts->phys;
204 input_dev->id.bustype = BUS_I2C;
205 input_dev->dev.parent = &client->dev;
206
207 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
208 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
209
210 input_set_abs_params(input_dev, ABS_X,
211 CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
212 input_set_abs_params(input_dev, ABS_Y,
213 CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
214
215 if (ts->reset_pin) {
216 err = gpio_request(ts->reset_pin, NULL);
217 if (err) {
218 dev_err(&client->dev,
219 "Unable to request GPIO pin %d.\n",
220 ts->reset_pin);
221 goto err_free_mem;
222 }
223 }
224
225 cy8ctmg110_power(ts, true);
226 cy8ctmg110_set_sleepmode(ts, false);
227
228 err = gpio_request(ts->irq_pin, "touch_irq_key");
229 if (err < 0) {
230 dev_err(&client->dev,
231 "Failed to request GPIO %d, error %d\n",
232 ts->irq_pin, err);
233 goto err_shutoff_device;
234 }
235
236 err = gpio_direction_input(ts->irq_pin);
237 if (err < 0) {
238 dev_err(&client->dev,
239 "Failed to configure input direction for GPIO %d, error %d\n",
240 ts->irq_pin, err);
241 goto err_free_irq_gpio;
242 }
243
244 client->irq = gpio_to_irq(ts->irq_pin);
245 if (client->irq < 0) {
246 err = client->irq;
247 dev_err(&client->dev,
248 "Unable to get irq number for GPIO %d, error %d\n",
249 ts->irq_pin, err);
250 goto err_free_irq_gpio;
251 }
252
253 err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
254 IRQF_TRIGGER_RISING, "touch_reset_key", ts);
255 if (err < 0) {
256 dev_err(&client->dev,
257 "irq %d busy? error %d\n", client->irq, err);
258 goto err_free_irq_gpio;
259 }
260
261 err = input_register_device(input_dev);
262 if (err)
263 goto err_free_irq;
264
265 i2c_set_clientdata(client, ts);
266 device_init_wakeup(&client->dev, 1);
267 return 0;
268
269err_free_irq:
270 free_irq(client->irq, ts);
271err_free_irq_gpio:
272 gpio_free(ts->irq_pin);
273err_shutoff_device:
274 cy8ctmg110_set_sleepmode(ts, true);
275 cy8ctmg110_power(ts, false);
276 if (ts->reset_pin)
277 gpio_free(ts->reset_pin);
278err_free_mem:
279 input_free_device(input_dev);
280 kfree(ts);
281 return err;
282}
283
284#ifdef CONFIG_PM
285static int cy8ctmg110_suspend(struct device *dev)
286{
287 struct i2c_client *client = to_i2c_client(dev);
288 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
289
290 if (device_may_wakeup(&client->dev))
291 enable_irq_wake(client->irq);
292 else {
293 cy8ctmg110_set_sleepmode(ts, true);
294 cy8ctmg110_power(ts, false);
295 }
296 return 0;
297}
298
299static int cy8ctmg110_resume(struct device *dev)
300{
301 struct i2c_client *client = to_i2c_client(dev);
302 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
303
304 if (device_may_wakeup(&client->dev))
305 disable_irq_wake(client->irq);
306 else {
307 cy8ctmg110_power(ts, true);
308 cy8ctmg110_set_sleepmode(ts, false);
309 }
310 return 0;
311}
312
313static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
314#endif
315
316static int __devexit cy8ctmg110_remove(struct i2c_client *client)
317{
318 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
319
320 cy8ctmg110_set_sleepmode(ts, true);
321 cy8ctmg110_power(ts, false);
322
323 free_irq(client->irq, ts);
324 input_unregister_device(ts->input);
325 gpio_free(ts->irq_pin);
326 if (ts->reset_pin)
327 gpio_free(ts->reset_pin);
328 kfree(ts);
329
330 return 0;
331}
332
333static const struct i2c_device_id cy8ctmg110_idtable[] = {
334 { CY8CTMG110_DRIVER_NAME, 1 },
335 { }
336};
337
338MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
339
340static struct i2c_driver cy8ctmg110_driver = {
341 .driver = {
342 .owner = THIS_MODULE,
343 .name = CY8CTMG110_DRIVER_NAME,
344#ifdef CONFIG_PM
345 .pm = &cy8ctmg110_pm,
346#endif
347 },
348 .id_table = cy8ctmg110_idtable,
349 .probe = cy8ctmg110_probe,
350 .remove = __devexit_p(cy8ctmg110_remove),
351};
352
353static int __init cy8ctmg110_init(void)
354{
355 return i2c_add_driver(&cy8ctmg110_driver);
356}
357
358static void __exit cy8ctmg110_exit(void)
359{
360 i2c_del_driver(&cy8ctmg110_driver);
361}
362
363module_init(cy8ctmg110_init);
364module_exit(cy8ctmg110_exit);
365
366MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
367MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
368MODULE_LICENSE("GPL v2");
369
