diff options
Diffstat (limited to 'drivers/input/touchscreen/st1232.c')
-rw-r--r-- | drivers/input/touchscreen/st1232.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c new file mode 100644 index 000000000000..4ab371358b33 --- /dev/null +++ b/drivers/input/touchscreen/st1232.c | |||
@@ -0,0 +1,274 @@ | |||
1 | /* | ||
2 | * ST1232 Touchscreen Controller Driver | ||
3 | * | ||
4 | * Copyright (C) 2010 Renesas Solutions Corp. | ||
5 | * Tony SIM <chinyeow.sim.xt@renesas.com> | ||
6 | * | ||
7 | * Using code from: | ||
8 | * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c | ||
9 | * Copyright (C) 2007 Google, Inc. | ||
10 | * | ||
11 | * This software is licensed under the terms of the GNU General Public | ||
12 | * License version 2, as published by the Free Software Foundation, and | ||
13 | * may be copied, distributed, and modified under those terms. | ||
14 | * | ||
15 | * This program is distributed in the hope that it will be useful, | ||
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
18 | * GNU General Public License for more details. | ||
19 | */ | ||
20 | |||
21 | #include <linux/delay.h> | ||
22 | #include <linux/i2c.h> | ||
23 | #include <linux/input.h> | ||
24 | #include <linux/interrupt.h> | ||
25 | #include <linux/module.h> | ||
26 | #include <linux/slab.h> | ||
27 | #include <linux/types.h> | ||
28 | |||
29 | #define ST1232_TS_NAME "st1232-ts" | ||
30 | |||
31 | #define MIN_X 0x00 | ||
32 | #define MIN_Y 0x00 | ||
33 | #define MAX_X 0x31f /* (800 - 1) */ | ||
34 | #define MAX_Y 0x1df /* (480 - 1) */ | ||
35 | #define MAX_AREA 0xff | ||
36 | #define MAX_FINGERS 2 | ||
37 | |||
38 | struct st1232_ts_finger { | ||
39 | u16 x; | ||
40 | u16 y; | ||
41 | u8 t; | ||
42 | bool is_valid; | ||
43 | }; | ||
44 | |||
45 | struct st1232_ts_data { | ||
46 | struct i2c_client *client; | ||
47 | struct input_dev *input_dev; | ||
48 | struct st1232_ts_finger finger[MAX_FINGERS]; | ||
49 | }; | ||
50 | |||
51 | static int st1232_ts_read_data(struct st1232_ts_data *ts) | ||
52 | { | ||
53 | struct st1232_ts_finger *finger = ts->finger; | ||
54 | struct i2c_client *client = ts->client; | ||
55 | struct i2c_msg msg[2]; | ||
56 | int error; | ||
57 | u8 start_reg; | ||
58 | u8 buf[10]; | ||
59 | |||
60 | /* read touchscreen data from ST1232 */ | ||
61 | msg[0].addr = client->addr; | ||
62 | msg[0].flags = 0; | ||
63 | msg[0].len = 1; | ||
64 | msg[0].buf = &start_reg; | ||
65 | start_reg = 0x10; | ||
66 | |||
67 | msg[1].addr = ts->client->addr; | ||
68 | msg[1].flags = I2C_M_RD; | ||
69 | msg[1].len = sizeof(buf); | ||
70 | msg[1].buf = buf; | ||
71 | |||
72 | error = i2c_transfer(client->adapter, msg, 2); | ||
73 | if (error < 0) | ||
74 | return error; | ||
75 | |||
76 | /* get "valid" bits */ | ||
77 | finger[0].is_valid = buf[2] >> 7; | ||
78 | finger[1].is_valid = buf[5] >> 7; | ||
79 | |||
80 | /* get xy coordinate */ | ||
81 | if (finger[0].is_valid) { | ||
82 | finger[0].x = ((buf[2] & 0x0070) << 4) | buf[3]; | ||
83 | finger[0].y = ((buf[2] & 0x0007) << 8) | buf[4]; | ||
84 | finger[0].t = buf[8]; | ||
85 | } | ||
86 | |||
87 | if (finger[1].is_valid) { | ||
88 | finger[1].x = ((buf[5] & 0x0070) << 4) | buf[6]; | ||
89 | finger[1].y = ((buf[5] & 0x0007) << 8) | buf[7]; | ||
90 | finger[1].t = buf[9]; | ||
91 | } | ||
92 | |||
93 | return 0; | ||
94 | } | ||
95 | |||
96 | static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id) | ||
97 | { | ||
98 | struct st1232_ts_data *ts = dev_id; | ||
99 | struct st1232_ts_finger *finger = ts->finger; | ||
100 | struct input_dev *input_dev = ts->input_dev; | ||
101 | int count = 0; | ||
102 | int i, ret; | ||
103 | |||
104 | ret = st1232_ts_read_data(ts); | ||
105 | if (ret < 0) | ||
106 | goto end; | ||
107 | |||
108 | /* multi touch protocol */ | ||
109 | for (i = 0; i < MAX_FINGERS; i++) { | ||
110 | if (!finger[i].is_valid) | ||
111 | continue; | ||
112 | |||
113 | input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[i].t); | ||
114 | input_report_abs(input_dev, ABS_MT_POSITION_X, finger[i].x); | ||
115 | input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[i].y); | ||
116 | input_mt_sync(input_dev); | ||
117 | count++; | ||
118 | } | ||
119 | |||
120 | /* SYN_MT_REPORT only if no contact */ | ||
121 | if (!count) | ||
122 | input_mt_sync(input_dev); | ||
123 | |||
124 | /* SYN_REPORT */ | ||
125 | input_sync(input_dev); | ||
126 | |||
127 | end: | ||
128 | return IRQ_HANDLED; | ||
129 | } | ||
130 | |||
131 | static int __devinit st1232_ts_probe(struct i2c_client *client, | ||
132 | const struct i2c_device_id *id) | ||
133 | { | ||
134 | struct st1232_ts_data *ts; | ||
135 | struct input_dev *input_dev; | ||
136 | int error; | ||
137 | |||
138 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | ||
139 | dev_err(&client->dev, "need I2C_FUNC_I2C\n"); | ||
140 | return -EIO; | ||
141 | } | ||
142 | |||
143 | if (!client->irq) { | ||
144 | dev_err(&client->dev, "no IRQ?\n"); | ||
145 | return -EINVAL; | ||
146 | } | ||
147 | |||
148 | |||
149 | ts = kzalloc(sizeof(struct st1232_ts_data), GFP_KERNEL); | ||
150 | input_dev = input_allocate_device(); | ||
151 | if (!ts || !input_dev) { | ||
152 | error = -ENOMEM; | ||
153 | goto err_free_mem; | ||
154 | } | ||
155 | |||
156 | ts->client = client; | ||
157 | ts->input_dev = input_dev; | ||
158 | |||
159 | input_dev->name = "st1232-touchscreen"; | ||
160 | input_dev->id.bustype = BUS_I2C; | ||
161 | input_dev->dev.parent = &client->dev; | ||
162 | |||
163 | __set_bit(EV_SYN, input_dev->evbit); | ||
164 | __set_bit(EV_KEY, input_dev->evbit); | ||
165 | __set_bit(EV_ABS, input_dev->evbit); | ||
166 | |||
167 | input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MAX_AREA, 0, 0); | ||
168 | input_set_abs_params(input_dev, ABS_MT_POSITION_X, MIN_X, MAX_X, 0, 0); | ||
169 | input_set_abs_params(input_dev, ABS_MT_POSITION_Y, MIN_Y, MAX_Y, 0, 0); | ||
170 | |||
171 | error = request_threaded_irq(client->irq, NULL, st1232_ts_irq_handler, | ||
172 | IRQF_ONESHOT, client->name, ts); | ||
173 | if (error) { | ||
174 | dev_err(&client->dev, "Failed to register interrupt\n"); | ||
175 | goto err_free_mem; | ||
176 | } | ||
177 | |||
178 | error = input_register_device(ts->input_dev); | ||
179 | if (error) { | ||
180 | dev_err(&client->dev, "Unable to register %s input device\n", | ||
181 | input_dev->name); | ||
182 | goto err_free_irq; | ||
183 | } | ||
184 | |||
185 | i2c_set_clientdata(client, ts); | ||
186 | device_init_wakeup(&client->dev, 1); | ||
187 | |||
188 | return 0; | ||
189 | |||
190 | err_free_irq: | ||
191 | free_irq(client->irq, ts); | ||
192 | err_free_mem: | ||
193 | input_free_device(input_dev); | ||
194 | kfree(ts); | ||
195 | return error; | ||
196 | } | ||
197 | |||
198 | static int __devexit st1232_ts_remove(struct i2c_client *client) | ||
199 | { | ||
200 | struct st1232_ts_data *ts = i2c_get_clientdata(client); | ||
201 | |||
202 | device_init_wakeup(&client->dev, 0); | ||
203 | free_irq(client->irq, ts); | ||
204 | input_unregister_device(ts->input_dev); | ||
205 | kfree(ts); | ||
206 | |||
207 | return 0; | ||
208 | } | ||
209 | |||
210 | #ifdef CONFIG_PM | ||
211 | static int st1232_ts_suspend(struct device *dev) | ||
212 | { | ||
213 | struct i2c_client *client = to_i2c_client(dev); | ||
214 | |||
215 | if (device_may_wakeup(&client->dev)) | ||
216 | enable_irq_wake(client->irq); | ||
217 | else | ||
218 | disable_irq(client->irq); | ||
219 | |||
220 | return 0; | ||
221 | } | ||
222 | |||
223 | static int st1232_ts_resume(struct device *dev) | ||
224 | { | ||
225 | struct i2c_client *client = to_i2c_client(dev); | ||
226 | |||
227 | if (device_may_wakeup(&client->dev)) | ||
228 | disable_irq_wake(client->irq); | ||
229 | else | ||
230 | enable_irq(client->irq); | ||
231 | |||
232 | return 0; | ||
233 | } | ||
234 | |||
235 | static const struct dev_pm_ops st1232_ts_pm_ops = { | ||
236 | .suspend = st1232_ts_suspend, | ||
237 | .resume = st1232_ts_resume, | ||
238 | }; | ||
239 | #endif | ||
240 | |||
241 | static const struct i2c_device_id st1232_ts_id[] = { | ||
242 | { ST1232_TS_NAME, 0 }, | ||
243 | { } | ||
244 | }; | ||
245 | MODULE_DEVICE_TABLE(i2c, st1232_ts_id); | ||
246 | |||
247 | static struct i2c_driver st1232_ts_driver = { | ||
248 | .probe = st1232_ts_probe, | ||
249 | .remove = __devexit_p(st1232_ts_remove), | ||
250 | .id_table = st1232_ts_id, | ||
251 | .driver = { | ||
252 | .name = ST1232_TS_NAME, | ||
253 | .owner = THIS_MODULE, | ||
254 | #ifdef CONFIG_PM | ||
255 | .pm = &st1232_ts_pm_ops, | ||
256 | #endif | ||
257 | }, | ||
258 | }; | ||
259 | |||
260 | static int __init st1232_ts_init(void) | ||
261 | { | ||
262 | return i2c_add_driver(&st1232_ts_driver); | ||
263 | } | ||
264 | module_init(st1232_ts_init); | ||
265 | |||
266 | static void __exit st1232_ts_exit(void) | ||
267 | { | ||
268 | i2c_del_driver(&st1232_ts_driver); | ||
269 | } | ||
270 | module_exit(st1232_ts_exit); | ||
271 | |||
272 | MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>"); | ||
273 | MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver"); | ||
274 | MODULE_LICENSE("GPL"); | ||