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 {
103 .addr = client->addr,
104 .len = 1,
105 .buf = &cmd
106 },
107
108 {
109 .addr = client->addr,
110 .flags = I2C_M_RD,
111 .len = len,
112 .buf = data
113 }
114 };
115
116 ret = i2c_transfer(client->adapter, msg, 2);
117 if (ret < 0)
118 return ret;
119
120 return 0;
121}
122
123static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
124{
125 struct input_dev *input = tsc->input;
126 unsigned char reg_p[CY8CTMG110_REG_MAX];
127 int x, y;
128
129 memset(reg_p, 0, CY8CTMG110_REG_MAX);
130
131
132 if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
133 return -EIO;
134
135 y = reg_p[2] << 8 | reg_p[3];
136 x = reg_p[0] << 8 | reg_p[1];
137
138
139 if (reg_p[8] == 0) {
140 input_report_key(input, BTN_TOUCH, 0);
141 } else {
142 input_report_key(input, BTN_TOUCH, 1);
143 input_report_abs(input, ABS_X, x);
144 input_report_abs(input, ABS_Y, y);
145 }
146
147 input_sync(input);
148
149 return 0;
150}
151
152static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
153{
154 unsigned char reg_p[3];
155
156 if (sleep) {
157 reg_p[0] = 0x00;
158 reg_p[1] = 0xff;
159 reg_p[2] = 5;
160 } else {
161 reg_p[0] = 0x10;
162 reg_p[1] = 0xff;
163 reg_p[2] = 0;
164 }
165
166 return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
167}
168
169static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
170{
171 struct cy8ctmg110 *tsc = dev_id;
172
173 cy8ctmg110_touch_pos(tsc);
174
175 return IRQ_HANDLED;
176}
177
178static int cy8ctmg110_probe(struct i2c_client *client,
179 const struct i2c_device_id *id)
180{
181 const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
182 struct cy8ctmg110 *ts;
183 struct input_dev *input_dev;
184 int err;
185
186
187 if (pdata == NULL) {
188 dev_err(&client->dev, "no pdata\n");
189 return -ENODEV;
190 }
191
192 if (!i2c_check_functionality(client->adapter,
193 I2C_FUNC_SMBUS_READ_WORD_DATA))
194 return -EIO;
195
196 ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
197 input_dev = input_allocate_device();
198 if (!ts || !input_dev) {
199 err = -ENOMEM;
200 goto err_free_mem;
201 }
202
203 ts->client = client;
204 ts->input = input_dev;
205 ts->reset_pin = pdata->reset_pin;
206 ts->irq_pin = pdata->irq_pin;
207
208 snprintf(ts->phys, sizeof(ts->phys),
209 "%s/input0", dev_name(&client->dev));
210
211 input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
212 input_dev->phys = ts->phys;
213 input_dev->id.bustype = BUS_I2C;
214 input_dev->dev.parent = &client->dev;
215
216 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
217 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
218
219 input_set_abs_params(input_dev, ABS_X,
220 CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
221 input_set_abs_params(input_dev, ABS_Y,
222 CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
223
224 if (ts->reset_pin) {
225 err = gpio_request(ts->reset_pin, NULL);
226 if (err) {
227 dev_err(&client->dev,
228 "Unable to request GPIO pin %d.\n",
229 ts->reset_pin);
230 goto err_free_mem;
231 }
232 }
233
234 cy8ctmg110_power(ts, true);
235 cy8ctmg110_set_sleepmode(ts, false);
236
237 err = gpio_request(ts->irq_pin, "touch_irq_key");
238 if (err < 0) {
239 dev_err(&client->dev,
240 "Failed to request GPIO %d, error %d\n",
241 ts->irq_pin, err);
242 goto err_shutoff_device;
243 }
244
245 err = gpio_direction_input(ts->irq_pin);
246 if (err < 0) {
247 dev_err(&client->dev,
248 "Failed to configure input direction for GPIO %d, error %d\n",
249 ts->irq_pin, err);
250 goto err_free_irq_gpio;
251 }
252
253 client->irq = gpio_to_irq(ts->irq_pin);
254 if (client->irq < 0) {
255 err = client->irq;
256 dev_err(&client->dev,
257 "Unable to get irq number for GPIO %d, error %d\n",
258 ts->irq_pin, err);
259 goto err_free_irq_gpio;
260 }
261
262 err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
263 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
264 "touch_reset_key", ts);
265 if (err < 0) {
266 dev_err(&client->dev,
267 "irq %d busy? error %d\n", client->irq, err);
268 goto err_free_irq_gpio;
269 }
270
271 err = input_register_device(input_dev);
272 if (err)
273 goto err_free_irq;
274
275 i2c_set_clientdata(client, ts);
276 device_init_wakeup(&client->dev, 1);
277 return 0;
278
279err_free_irq:
280 free_irq(client->irq, ts);
281err_free_irq_gpio:
282 gpio_free(ts->irq_pin);
283err_shutoff_device:
284 cy8ctmg110_set_sleepmode(ts, true);
285 cy8ctmg110_power(ts, false);
286 if (ts->reset_pin)
287 gpio_free(ts->reset_pin);
288err_free_mem:
289 input_free_device(input_dev);
290 kfree(ts);
291 return err;
292}
293
294static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
295{
296 struct i2c_client *client = to_i2c_client(dev);
297 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
298
299 if (device_may_wakeup(&client->dev))
300 enable_irq_wake(client->irq);
301 else {
302 cy8ctmg110_set_sleepmode(ts, true);
303 cy8ctmg110_power(ts, false);
304 }
305 return 0;
306}
307
308static int __maybe_unused cy8ctmg110_resume(struct device *dev)
309{
310 struct i2c_client *client = to_i2c_client(dev);
311 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
312
313 if (device_may_wakeup(&client->dev))
314 disable_irq_wake(client->irq);
315 else {
316 cy8ctmg110_power(ts, true);
317 cy8ctmg110_set_sleepmode(ts, false);
318 }
319 return 0;
320}
321
322static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
323
324static int cy8ctmg110_remove(struct i2c_client *client)
325{
326 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
327
328 cy8ctmg110_set_sleepmode(ts, true);
329 cy8ctmg110_power(ts, false);
330
331 free_irq(client->irq, ts);
332 input_unregister_device(ts->input);
333 gpio_free(ts->irq_pin);
334 if (ts->reset_pin)
335 gpio_free(ts->reset_pin);
336 kfree(ts);
337
338 return 0;
339}
340
341static const struct i2c_device_id cy8ctmg110_idtable[] = {
342 { CY8CTMG110_DRIVER_NAME, 1 },
343 { }
344};
345
346MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
347
348static struct i2c_driver cy8ctmg110_driver = {
349 .driver = {
350 .name = CY8CTMG110_DRIVER_NAME,
351 .pm = &cy8ctmg110_pm,
352 },
353 .id_table = cy8ctmg110_idtable,
354 .probe = cy8ctmg110_probe,
355 .remove = cy8ctmg110_remove,
356};
357
358module_i2c_driver(cy8ctmg110_driver);
359
360MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
361MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
362MODULE_LICENSE("GPL v2");
363
