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Input: request threaded-only IRQs with IRQF_ONESHOT
[mirror_ubuntu-focal-kernel.git] / drivers / input / touchscreen / cy8ctmg110_ts.c
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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;
f1b50760 78 int ret;
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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);
21184c4e 87 if (ret != len + 1) {
60347c19 88 dev_err(&client->dev, "i2c write data cmd failed\n");
21184c4e 89 return ret < 0 ? ret : -EIO;
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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;
f1b50760 99 int ret;
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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;
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196 ts->reset_pin = pdata->reset_pin;
197 ts->irq_pin = pdata->irq_pin;
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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,
a4e6aad6 211 CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
60347c19 212 input_set_abs_params(input_dev, ABS_Y,
a4e6aad6 213 CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
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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,
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254 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
255 "touch_reset_key", ts);
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256 if (err < 0) {
257 dev_err(&client->dev,
258 "irq %d busy? error %d\n", client->irq, err);
259 goto err_free_irq_gpio;
260 }
261
262 err = input_register_device(input_dev);
263 if (err)
264 goto err_free_irq;
265
266 i2c_set_clientdata(client, ts);
267 device_init_wakeup(&client->dev, 1);
268 return 0;
269
270err_free_irq:
271 free_irq(client->irq, ts);
272err_free_irq_gpio:
273 gpio_free(ts->irq_pin);
274err_shutoff_device:
275 cy8ctmg110_set_sleepmode(ts, true);
276 cy8ctmg110_power(ts, false);
277 if (ts->reset_pin)
278 gpio_free(ts->reset_pin);
279err_free_mem:
280 input_free_device(input_dev);
281 kfree(ts);
282 return err;
283}
284
285#ifdef CONFIG_PM
93f38e91 286static int cy8ctmg110_suspend(struct device *dev)
60347c19 287{
93f38e91 288 struct i2c_client *client = to_i2c_client(dev);
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289 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
290
291 if (device_may_wakeup(&client->dev))
292 enable_irq_wake(client->irq);
293 else {
294 cy8ctmg110_set_sleepmode(ts, true);
295 cy8ctmg110_power(ts, false);
296 }
297 return 0;
298}
299
93f38e91 300static int cy8ctmg110_resume(struct device *dev)
60347c19 301{
93f38e91 302 struct i2c_client *client = to_i2c_client(dev);
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303 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
304
305 if (device_may_wakeup(&client->dev))
306 disable_irq_wake(client->irq);
307 else {
308 cy8ctmg110_power(ts, true);
309 cy8ctmg110_set_sleepmode(ts, false);
310 }
311 return 0;
312}
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313
314static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
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315#endif
316
317static int __devexit cy8ctmg110_remove(struct i2c_client *client)
318{
319 struct cy8ctmg110 *ts = i2c_get_clientdata(client);
320
321 cy8ctmg110_set_sleepmode(ts, true);
322 cy8ctmg110_power(ts, false);
323
324 free_irq(client->irq, ts);
325 input_unregister_device(ts->input);
326 gpio_free(ts->irq_pin);
327 if (ts->reset_pin)
328 gpio_free(ts->reset_pin);
329 kfree(ts);
330
331 return 0;
332}
333
d448303a 334static const struct i2c_device_id cy8ctmg110_idtable[] = {
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335 { CY8CTMG110_DRIVER_NAME, 1 },
336 { }
337};
338
339MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
340
341static struct i2c_driver cy8ctmg110_driver = {
342 .driver = {
343 .owner = THIS_MODULE,
344 .name = CY8CTMG110_DRIVER_NAME,
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345#ifdef CONFIG_PM
346 .pm = &cy8ctmg110_pm,
347#endif
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348 },
349 .id_table = cy8ctmg110_idtable,
350 .probe = cy8ctmg110_probe,
351 .remove = __devexit_p(cy8ctmg110_remove),
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352};
353
1b92c1cf 354module_i2c_driver(cy8ctmg110_driver);
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355
356MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
357MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
358MODULE_LICENSE("GPL v2");