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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/i2c.h>
11#include <linux/input.h>
12#include <linux/interrupt.h>
13#include <linux/gpio/consumer.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <asm/byteorder.h>
18
19#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
20
21/* Touch coordinates */
22#define CY8CTMG110_X_MIN 0
23#define CY8CTMG110_Y_MIN 0
24#define CY8CTMG110_X_MAX 759
25#define CY8CTMG110_Y_MAX 465
26
27
28/* cy8ctmg110 register definitions */
29#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
30#define CY8CTMG110_TOUCH_SLEEP_TIME 2
31#define CY8CTMG110_TOUCH_X1 3
32#define CY8CTMG110_TOUCH_Y1 5
33#define CY8CTMG110_TOUCH_X2 7
34#define CY8CTMG110_TOUCH_Y2 9
35#define CY8CTMG110_FINGERS 11
36#define CY8CTMG110_GESTURE 12
37#define CY8CTMG110_REG_MAX 13
38
39
40/*
41 * The touch driver structure.
42 */
43struct cy8ctmg110 {
44 struct input_dev *input;
45 char phys[32];
46 struct i2c_client *client;
47 struct gpio_desc *reset_gpio;
48};
49
50/*
51 * cy8ctmg110_power is the routine that is called when touch hardware
52 * is being powered off or on. When powering on this routine de-asserts
53 * the RESET line, when powering off reset line is asserted.
54 */
55static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
56{
57 if (ts->reset_gpio)
58 gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
59}
60
61static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
62 unsigned char len, unsigned char *value)
63{
64 struct i2c_client *client = tsc->client;
65 int ret;
66 unsigned char i2c_data[6];
67
68 BUG_ON(len > 5);
69
70 i2c_data[0] = reg;
71 memcpy(i2c_data + 1, value, len);
72
73 ret = i2c_master_send(client, i2c_data, len + 1);
74 if (ret != len + 1) {
75 dev_err(&client->dev, "i2c write data cmd failed\n");
76 return ret < 0 ? ret : -EIO;
77 }
78
79 return 0;
80}
81
82static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
83 unsigned char *data, unsigned char len, unsigned char cmd)
84{
85 struct i2c_client *client = tsc->client;
86 int ret;
87 struct i2c_msg msg[2] = {
88 /* first write slave position to i2c devices */
89 {
90 .addr = client->addr,
91 .len = 1,
92 .buf = &cmd
93 },
94 /* Second read data from position */
95 {
96 .addr = client->addr,
97 .flags = I2C_M_RD,
98 .len = len,
99 .buf = data
100 }
101 };
102
103 ret = i2c_transfer(client->adapter, msg, 2);
104 if (ret < 0)
105 return ret;
106
107 return 0;
108}
109
110static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
111{
112 struct input_dev *input = tsc->input;
113 unsigned char reg_p[CY8CTMG110_REG_MAX];
114
115 memset(reg_p, 0, CY8CTMG110_REG_MAX);
116
117 /* Reading coordinates */
118 if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
119 return -EIO;
120
121 /* Number of touch */
122 if (reg_p[8] == 0) {
123 input_report_key(input, BTN_TOUCH, 0);
124 } else {
125 input_report_key(input, BTN_TOUCH, 1);
126 input_report_abs(input, ABS_X,
127 be16_to_cpup((__be16 *)(reg_p + 0)));
128 input_report_abs(input, ABS_Y,
129 be16_to_cpup((__be16 *)(reg_p + 2)));
130 }
131
132 input_sync(input);
133
134 return 0;
135}
136
137static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
138{
139 unsigned char reg_p[3];
140
141 if (sleep) {
142 reg_p[0] = 0x00;
143 reg_p[1] = 0xff;
144 reg_p[2] = 5;
145 } else {
146 reg_p[0] = 0x10;
147 reg_p[1] = 0xff;
148 reg_p[2] = 0;
149 }
150
151 return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
152}
153
154static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
155{
156 struct cy8ctmg110 *tsc = dev_id;
157
158 cy8ctmg110_touch_pos(tsc);
159
160 return IRQ_HANDLED;
161}
162
163static void cy8ctmg110_shut_off(void *_ts)
164{
165 struct cy8ctmg110 *ts = _ts;
166
167 cy8ctmg110_set_sleepmode(ts, true);
168 cy8ctmg110_power(ts, false);
169}
170
171static int cy8ctmg110_probe(struct i2c_client *client)
172{
173 struct cy8ctmg110 *ts;
174 struct input_dev *input_dev;
175 int err;
176
177 if (!i2c_check_functionality(client->adapter,
178 I2C_FUNC_SMBUS_READ_WORD_DATA))
179 return -EIO;
180
181 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
182 if (!ts)
183 return -ENOMEM;
184
185 input_dev = devm_input_allocate_device(&client->dev);
186 if (!input_dev)
187 return -ENOMEM;
188
189 ts->client = client;
190 ts->input = input_dev;
191
192 snprintf(ts->phys, sizeof(ts->phys),
193 "%s/input0", dev_name(&client->dev));
194
195 input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
196 input_dev->phys = ts->phys;
197 input_dev->id.bustype = BUS_I2C;
198
199 input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
200 input_set_abs_params(input_dev, ABS_X,
201 CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
202 input_set_abs_params(input_dev, ABS_Y,
203 CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
204
205 /* Request and assert reset line */
206 ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
207 GPIOD_OUT_HIGH);
208 if (IS_ERR(ts->reset_gpio)) {
209 err = PTR_ERR(ts->reset_gpio);
210 dev_err(&client->dev,
211 "Unable to request reset GPIO: %d\n", err);
212 return err;
213 }
214
215 cy8ctmg110_power(ts, true);
216 cy8ctmg110_set_sleepmode(ts, false);
217
218 err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts);
219 if (err)
220 return err;
221
222 err = devm_request_threaded_irq(&client->dev, client->irq,
223 NULL, cy8ctmg110_irq_thread,
224 IRQF_ONESHOT, "touch_reset_key", ts);
225 if (err) {
226 dev_err(&client->dev,
227 "irq %d busy? error %d\n", client->irq, err);
228 return err;
229 }
230
231 err = input_register_device(input_dev);
232 if (err)
233 return err;
234
235 i2c_set_clientdata(client, ts);
236
237 return 0;
238}
239
240static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
241{
242 struct i2c_client *client = to_i2c_client(dev);
243 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
244
245 if (!device_may_wakeup(&client->dev)) {
246 cy8ctmg110_set_sleepmode(ts, true);
247 cy8ctmg110_power(ts, false);
248 }
249
250 return 0;
251}
252
253static int __maybe_unused cy8ctmg110_resume(struct device *dev)
254{
255 struct i2c_client *client = to_i2c_client(dev);
256 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
257
258 if (!device_may_wakeup(&client->dev)) {
259 cy8ctmg110_power(ts, true);
260 cy8ctmg110_set_sleepmode(ts, false);
261 }
262
263 return 0;
264}
265
266static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
267
268static const struct i2c_device_id cy8ctmg110_idtable[] = {
269 { CY8CTMG110_DRIVER_NAME, 1 },
270 { }
271};
272
273MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
274
275static struct i2c_driver cy8ctmg110_driver = {
276 .driver = {
277 .name = CY8CTMG110_DRIVER_NAME,
278 .pm = &cy8ctmg110_pm,
279 },
280 .id_table = cy8ctmg110_idtable,
281 .probe_new = cy8ctmg110_probe,
282};
283
284module_i2c_driver(cy8ctmg110_driver);
285
286MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
287MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
288MODULE_LICENSE("GPL v2");
1/*
2 * Driver for cypress touch screen controller
3 *
4 * Copyright (c) 2009 Aava Mobile
5 *
6 * Some cleanups by Alan Cox <alan@linux.intel.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/* Touch coordinates */
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/* cy8ctmg110 register definitions */
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 * The touch driver structure.
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 * cy8ctmg110_power is the routine that is called when touch hardware
66 * will powered off or on.
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 /* first write slave position to i2c devices */
102 { client->addr, 0, 1, &cmd },
103 /* Second read data from position */
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 /* Reading coordinates */
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 /* Number of touch */
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 /* No pdata no way forward */
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");