1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Driver for cypress touch screen controller
4 *
5 * Copyright (c) 2009 Aava Mobile
6 *
7 * Some cleanups by Alan Cox <alan@linux.intel.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/input.h>
13 #include <linux/slab.h>
14 #include <linux/interrupt.h>
15 #include <linux/io.h>
16 #include <linux/i2c.h>
17 #include <linux/gpio.h>
18 #include <linux/input/cy8ctmg110_pdata.h>
19
20 #define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
21
22 /* Touch coordinates */
23 #define CY8CTMG110_X_MIN 0
24 #define CY8CTMG110_Y_MIN 0
25 #define CY8CTMG110_X_MAX 759
26 #define CY8CTMG110_Y_MAX 465
27
28
29 /* cy8ctmg110 register definitions */
30 #define CY8CTMG110_TOUCH_WAKEUP_TIME 0
31 #define CY8CTMG110_TOUCH_SLEEP_TIME 2
32 #define CY8CTMG110_TOUCH_X1 3
33 #define CY8CTMG110_TOUCH_Y1 5
34 #define CY8CTMG110_TOUCH_X2 7
35 #define CY8CTMG110_TOUCH_Y2 9
36 #define CY8CTMG110_FINGERS 11
37 #define CY8CTMG110_GESTURE 12
38 #define CY8CTMG110_REG_MAX 13
39
40
41 /*
42 * The touch driver structure.
43 */
44 struct cy8ctmg110 {
45 struct input_dev *input;
46 char phys[32];
47 struct i2c_client *client;
48 int reset_pin;
49 int irq_pin;
50 };
51
52 /*
53 * cy8ctmg110_power is the routine that is called when touch hardware
54 * will powered off or on.
55 */
cy8ctmg110_power(struct cy8ctmg110 * ts,bool poweron)56 static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
57 {
58 if (ts->reset_pin)
59 gpio_direction_output(ts->reset_pin, 1 - poweron);
60 }
61
cy8ctmg110_write_regs(struct cy8ctmg110 * tsc,unsigned char reg,unsigned char len,unsigned char * value)62 static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
63 unsigned char len, unsigned char *value)
64 {
65 struct i2c_client *client = tsc->client;
66 int ret;
67 unsigned char i2c_data[6];
68
69 BUG_ON(len > 5);
70
71 i2c_data[0] = reg;
72 memcpy(i2c_data + 1, value, len);
73
74 ret = i2c_master_send(client, i2c_data, len + 1);
75 if (ret != len + 1) {
76 dev_err(&client->dev, "i2c write data cmd failed\n");
77 return ret < 0 ? ret : -EIO;
78 }
79
80 return 0;
81 }
82
cy8ctmg110_read_regs(struct cy8ctmg110 * tsc,unsigned char * data,unsigned char len,unsigned char cmd)83 static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
84 unsigned char *data, unsigned char len, unsigned char cmd)
85 {
86 struct i2c_client *client = tsc->client;
87 int ret;
88 struct i2c_msg msg[2] = {
89 /* first write slave position to i2c devices */
90 {
91 .addr = client->addr,
92 .len = 1,
93 .buf = &cmd
94 },
95 /* Second read data from position */
96 {
97 .addr = client->addr,
98 .flags = I2C_M_RD,
99 .len = len,
100 .buf = data
101 }
102 };
103
104 ret = i2c_transfer(client->adapter, msg, 2);
105 if (ret < 0)
106 return ret;
107
108 return 0;
109 }
110
cy8ctmg110_touch_pos(struct cy8ctmg110 * tsc)111 static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
112 {
113 struct input_dev *input = tsc->input;
114 unsigned char reg_p[CY8CTMG110_REG_MAX];
115 int x, y;
116
117 memset(reg_p, 0, CY8CTMG110_REG_MAX);
118
119 /* Reading coordinates */
120 if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
121 return -EIO;
122
123 y = reg_p[2] << 8 | reg_p[3];
124 x = reg_p[0] << 8 | reg_p[1];
125
126 /* Number of touch */
127 if (reg_p[8] == 0) {
128 input_report_key(input, BTN_TOUCH, 0);
129 } else {
130 input_report_key(input, BTN_TOUCH, 1);
131 input_report_abs(input, ABS_X, x);
132 input_report_abs(input, ABS_Y, y);
133 }
134
135 input_sync(input);
136
137 return 0;
138 }
139
cy8ctmg110_set_sleepmode(struct cy8ctmg110 * ts,bool sleep)140 static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
141 {
142 unsigned char reg_p[3];
143
144 if (sleep) {
145 reg_p[0] = 0x00;
146 reg_p[1] = 0xff;
147 reg_p[2] = 5;
148 } else {
149 reg_p[0] = 0x10;
150 reg_p[1] = 0xff;
151 reg_p[2] = 0;
152 }
153
154 return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
155 }
156
cy8ctmg110_irq_thread(int irq,void * dev_id)157 static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
158 {
159 struct cy8ctmg110 *tsc = dev_id;
160
161 cy8ctmg110_touch_pos(tsc);
162
163 return IRQ_HANDLED;
164 }
165
cy8ctmg110_probe(struct i2c_client * client,const struct i2c_device_id * id)166 static int cy8ctmg110_probe(struct i2c_client *client,
167 const struct i2c_device_id *id)
168 {
169 const struct cy8ctmg110_pdata *pdata = dev_get_platdata(&client->dev);
170 struct cy8ctmg110 *ts;
171 struct input_dev *input_dev;
172 int err;
173
174 /* No pdata no way forward */
175 if (pdata == NULL) {
176 dev_err(&client->dev, "no pdata\n");
177 return -ENODEV;
178 }
179
180 if (!i2c_check_functionality(client->adapter,
181 I2C_FUNC_SMBUS_READ_WORD_DATA))
182 return -EIO;
183
184 ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
185 input_dev = input_allocate_device();
186 if (!ts || !input_dev) {
187 err = -ENOMEM;
188 goto err_free_mem;
189 }
190
191 ts->client = client;
192 ts->input = input_dev;
193 ts->reset_pin = pdata->reset_pin;
194 ts->irq_pin = pdata->irq_pin;
195
196 snprintf(ts->phys, sizeof(ts->phys),
197 "%s/input0", dev_name(&client->dev));
198
199 input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
200 input_dev->phys = ts->phys;
201 input_dev->id.bustype = BUS_I2C;
202 input_dev->dev.parent = &client->dev;
203
204 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
205 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
206
207 input_set_abs_params(input_dev, ABS_X,
208 CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
209 input_set_abs_params(input_dev, ABS_Y,
210 CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
211
212 if (ts->reset_pin) {
213 err = gpio_request(ts->reset_pin, NULL);
214 if (err) {
215 dev_err(&client->dev,
216 "Unable to request GPIO pin %d.\n",
217 ts->reset_pin);
218 goto err_free_mem;
219 }
220 }
221
222 cy8ctmg110_power(ts, true);
223 cy8ctmg110_set_sleepmode(ts, false);
224
225 err = gpio_request(ts->irq_pin, "touch_irq_key");
226 if (err < 0) {
227 dev_err(&client->dev,
228 "Failed to request GPIO %d, error %d\n",
229 ts->irq_pin, err);
230 goto err_shutoff_device;
231 }
232
233 err = gpio_direction_input(ts->irq_pin);
234 if (err < 0) {
235 dev_err(&client->dev,
236 "Failed to configure input direction for GPIO %d, error %d\n",
237 ts->irq_pin, err);
238 goto err_free_irq_gpio;
239 }
240
241 client->irq = gpio_to_irq(ts->irq_pin);
242 if (client->irq < 0) {
243 err = client->irq;
244 dev_err(&client->dev,
245 "Unable to get irq number for GPIO %d, error %d\n",
246 ts->irq_pin, err);
247 goto err_free_irq_gpio;
248 }
249
250 err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
251 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
252 "touch_reset_key", ts);
253 if (err < 0) {
254 dev_err(&client->dev,
255 "irq %d busy? error %d\n", client->irq, err);
256 goto err_free_irq_gpio;
257 }
258
259 err = input_register_device(input_dev);
260 if (err)
261 goto err_free_irq;
262
263 i2c_set_clientdata(client, ts);
264 device_init_wakeup(&client->dev, 1);
265 return 0;
266
267 err_free_irq:
268 free_irq(client->irq, ts);
269 err_free_irq_gpio:
270 gpio_free(ts->irq_pin);
271 err_shutoff_device:
272 cy8ctmg110_set_sleepmode(ts, true);
273 cy8ctmg110_power(ts, false);
274 if (ts->reset_pin)
275 gpio_free(ts->reset_pin);
276 err_free_mem:
277 input_free_device(input_dev);
278 kfree(ts);
279 return err;
280 }
281
cy8ctmg110_suspend(struct device * dev)282 static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
283 {
284 struct i2c_client *client = to_i2c_client(dev);
285 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
286
287 if (device_may_wakeup(&client->dev))
288 enable_irq_wake(client->irq);
289 else {
290 cy8ctmg110_set_sleepmode(ts, true);
291 cy8ctmg110_power(ts, false);
292 }
293 return 0;
294 }
295
cy8ctmg110_resume(struct device * dev)296 static int __maybe_unused cy8ctmg110_resume(struct device *dev)
297 {
298 struct i2c_client *client = to_i2c_client(dev);
299 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
300
301 if (device_may_wakeup(&client->dev))
302 disable_irq_wake(client->irq);
303 else {
304 cy8ctmg110_power(ts, true);
305 cy8ctmg110_set_sleepmode(ts, false);
306 }
307 return 0;
308 }
309
310 static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
311
cy8ctmg110_remove(struct i2c_client * client)312 static int cy8ctmg110_remove(struct i2c_client *client)
313 {
314 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
315
316 cy8ctmg110_set_sleepmode(ts, true);
317 cy8ctmg110_power(ts, false);
318
319 free_irq(client->irq, ts);
320 input_unregister_device(ts->input);
321 gpio_free(ts->irq_pin);
322 if (ts->reset_pin)
323 gpio_free(ts->reset_pin);
324 kfree(ts);
325
326 return 0;
327 }
328
329 static const struct i2c_device_id cy8ctmg110_idtable[] = {
330 { CY8CTMG110_DRIVER_NAME, 1 },
331 { }
332 };
333
334 MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
335
336 static struct i2c_driver cy8ctmg110_driver = {
337 .driver = {
338 .name = CY8CTMG110_DRIVER_NAME,
339 .pm = &cy8ctmg110_pm,
340 },
341 .id_table = cy8ctmg110_idtable,
342 .probe = cy8ctmg110_probe,
343 .remove = cy8ctmg110_remove,
344 };
345
346 module_i2c_driver(cy8ctmg110_driver);
347
348 MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
349 MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
350 MODULE_LICENSE("GPL v2");
351