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60347c19 SK |
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 | */ | |
56 | struct 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 | */ | |
68 | static 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 | ||
74 | static 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; |
60347c19 SK |
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; |
60347c19 SK |
90 | } |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static 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; |
60347c19 SK |
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 | ||
114 | static 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 | ||
143 | static 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 | ||
160 | static 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 | ||
169 | static 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; | |
2c204109 AL |
196 | ts->reset_pin = pdata->reset_pin; |
197 | ts->irq_pin = pdata->irq_pin; | |
60347c19 SK |
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); |
60347c19 SK |
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, | |
9b7e31bb LPC |
254 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, |
255 | "touch_reset_key", ts); | |
60347c19 SK |
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 | ||
270 | err_free_irq: | |
271 | free_irq(client->irq, ts); | |
272 | err_free_irq_gpio: | |
273 | gpio_free(ts->irq_pin); | |
274 | err_shutoff_device: | |
275 | cy8ctmg110_set_sleepmode(ts, true); | |
276 | cy8ctmg110_power(ts, false); | |
277 | if (ts->reset_pin) | |
278 | gpio_free(ts->reset_pin); | |
279 | err_free_mem: | |
280 | input_free_device(input_dev); | |
281 | kfree(ts); | |
282 | return err; | |
283 | } | |
284 | ||
285 | #ifdef CONFIG_PM | |
93f38e91 | 286 | static int cy8ctmg110_suspend(struct device *dev) |
60347c19 | 287 | { |
93f38e91 | 288 | struct i2c_client *client = to_i2c_client(dev); |
60347c19 SK |
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 | 300 | static int cy8ctmg110_resume(struct device *dev) |
60347c19 | 301 | { |
93f38e91 | 302 | struct i2c_client *client = to_i2c_client(dev); |
60347c19 SK |
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 | } | |
93f38e91 MB |
313 | |
314 | static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume); | |
60347c19 SK |
315 | #endif |
316 | ||
317 | static 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 | 334 | static const struct i2c_device_id cy8ctmg110_idtable[] = { |
60347c19 SK |
335 | { CY8CTMG110_DRIVER_NAME, 1 }, |
336 | { } | |
337 | }; | |
338 | ||
339 | MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable); | |
340 | ||
341 | static struct i2c_driver cy8ctmg110_driver = { | |
342 | .driver = { | |
343 | .owner = THIS_MODULE, | |
344 | .name = CY8CTMG110_DRIVER_NAME, | |
93f38e91 MB |
345 | #ifdef CONFIG_PM |
346 | .pm = &cy8ctmg110_pm, | |
347 | #endif | |
60347c19 SK |
348 | }, |
349 | .id_table = cy8ctmg110_idtable, | |
350 | .probe = cy8ctmg110_probe, | |
351 | .remove = __devexit_p(cy8ctmg110_remove), | |
60347c19 SK |
352 | }; |
353 | ||
1b92c1cf | 354 | module_i2c_driver(cy8ctmg110_driver); |
60347c19 SK |
355 | |
356 | MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>"); | |
357 | MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver"); | |
358 | MODULE_LICENSE("GPL v2"); |