Loading...
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 {
103 .addr = client->addr,
104 .len = 1,
105 .buf = &cmd
106 },
107 /* Second read data from position */
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 /* Reading coordinates */
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 /* Number of touch */
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 /* No pdata no way forward */
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");
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 */
44struct 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 */
56static 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
62static 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
83static 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
111static 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
140static 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
157static 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
166static 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
267err_free_irq:
268 free_irq(client->irq, ts);
269err_free_irq_gpio:
270 gpio_free(ts->irq_pin);
271err_shutoff_device:
272 cy8ctmg110_set_sleepmode(ts, true);
273 cy8ctmg110_power(ts, false);
274 if (ts->reset_pin)
275 gpio_free(ts->reset_pin);
276err_free_mem:
277 input_free_device(input_dev);
278 kfree(ts);
279 return err;
280}
281
282static 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
296static 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
310static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
311
312static 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
329static const struct i2c_device_id cy8ctmg110_idtable[] = {
330 { CY8CTMG110_DRIVER_NAME, 1 },
331 { }
332};
333
334MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
335
336static 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
346module_i2c_driver(cy8ctmg110_driver);
347
348MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
349MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
350MODULE_LICENSE("GPL v2");