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59bae1db ZJ |
1 | /* |
2 | * Driver for EETI eGalax Multiple Touch Controller | |
3 | * | |
4 | * Copyright (C) 2011 Freescale Semiconductor, Inc. | |
5 | * | |
6 | * based on max11801_ts.c | |
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 | ||
13 | /* EETI eGalax serial touch screen controller is a I2C based multiple | |
14 | * touch screen controller, it supports 5 point multiple touch. */ | |
15 | ||
16 | /* TODO: | |
17 | - auto idle mode support | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/i2c.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/input.h> | |
25 | #include <linux/irq.h> | |
26 | #include <linux/gpio.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/bitops.h> | |
30 | #include <linux/input/mt.h> | |
ae495e84 | 31 | #include <linux/of_gpio.h> |
59bae1db ZJ |
32 | |
33 | /* | |
34 | * Mouse Mode: some panel may configure the controller to mouse mode, | |
35 | * which can only report one point at a given time. | |
36 | * This driver will ignore events in this mode. | |
37 | */ | |
38 | #define REPORT_MODE_MOUSE 0x1 | |
39 | /* | |
40 | * Vendor Mode: this mode is used to transfer some vendor specific | |
41 | * messages. | |
42 | * This driver will ignore events in this mode. | |
43 | */ | |
44 | #define REPORT_MODE_VENDOR 0x3 | |
45 | /* Multiple Touch Mode */ | |
46 | #define REPORT_MODE_MTTOUCH 0x4 | |
47 | ||
48 | #define MAX_SUPPORT_POINTS 5 | |
49 | ||
50 | #define EVENT_VALID_OFFSET 7 | |
51 | #define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET) | |
52 | #define EVENT_ID_OFFSET 2 | |
53 | #define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET) | |
54 | #define EVENT_IN_RANGE (0x1 << 1) | |
55 | #define EVENT_DOWN_UP (0X1 << 0) | |
56 | ||
57 | #define MAX_I2C_DATA_LEN 10 | |
58 | ||
59 | #define EGALAX_MAX_X 32760 | |
60 | #define EGALAX_MAX_Y 32760 | |
61 | #define EGALAX_MAX_TRIES 100 | |
62 | ||
63 | struct egalax_ts { | |
64 | struct i2c_client *client; | |
65 | struct input_dev *input_dev; | |
66 | }; | |
67 | ||
68 | static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id) | |
69 | { | |
70 | struct egalax_ts *ts = dev_id; | |
71 | struct input_dev *input_dev = ts->input_dev; | |
72 | struct i2c_client *client = ts->client; | |
73 | u8 buf[MAX_I2C_DATA_LEN]; | |
74 | int id, ret, x, y, z; | |
75 | int tries = 0; | |
76 | bool down, valid; | |
77 | u8 state; | |
78 | ||
79 | do { | |
80 | ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN); | |
81 | } while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES); | |
82 | ||
83 | if (ret < 0) | |
84 | return IRQ_HANDLED; | |
85 | ||
86 | if (buf[0] != REPORT_MODE_MTTOUCH) { | |
87 | /* ignore mouse events and vendor events */ | |
88 | return IRQ_HANDLED; | |
89 | } | |
90 | ||
91 | state = buf[1]; | |
92 | x = (buf[3] << 8) | buf[2]; | |
93 | y = (buf[5] << 8) | buf[4]; | |
94 | z = (buf[7] << 8) | buf[6]; | |
95 | ||
96 | valid = state & EVENT_VALID_MASK; | |
97 | id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET; | |
98 | down = state & EVENT_DOWN_UP; | |
99 | ||
100 | if (!valid || id > MAX_SUPPORT_POINTS) { | |
101 | dev_dbg(&client->dev, "point invalid\n"); | |
102 | return IRQ_HANDLED; | |
103 | } | |
104 | ||
105 | input_mt_slot(input_dev, id); | |
106 | input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down); | |
107 | ||
108 | dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d", | |
109 | down ? "down" : "up", id, x, y, z); | |
110 | ||
111 | if (down) { | |
112 | input_report_abs(input_dev, ABS_MT_POSITION_X, x); | |
113 | input_report_abs(input_dev, ABS_MT_POSITION_Y, y); | |
114 | input_report_abs(input_dev, ABS_MT_PRESSURE, z); | |
115 | } | |
116 | ||
117 | input_mt_report_pointer_emulation(input_dev, true); | |
118 | input_sync(input_dev); | |
119 | ||
120 | return IRQ_HANDLED; | |
121 | } | |
122 | ||
123 | /* wake up controller by an falling edge of interrupt gpio. */ | |
124 | static int egalax_wake_up_device(struct i2c_client *client) | |
125 | { | |
ae495e84 HW |
126 | struct device_node *np = client->dev.of_node; |
127 | int gpio; | |
59bae1db ZJ |
128 | int ret; |
129 | ||
ae495e84 HW |
130 | if (!np) |
131 | return -ENODEV; | |
132 | ||
133 | gpio = of_get_named_gpio(np, "wakeup-gpios", 0); | |
134 | if (!gpio_is_valid(gpio)) | |
135 | return -ENODEV; | |
136 | ||
59bae1db ZJ |
137 | ret = gpio_request(gpio, "egalax_irq"); |
138 | if (ret < 0) { | |
139 | dev_err(&client->dev, | |
140 | "request gpio failed, cannot wake up controller: %d\n", | |
141 | ret); | |
142 | return ret; | |
143 | } | |
144 | ||
145 | /* wake up controller via an falling edge on IRQ gpio. */ | |
146 | gpio_direction_output(gpio, 0); | |
147 | gpio_set_value(gpio, 1); | |
148 | ||
149 | /* controller should be waken up, return irq. */ | |
150 | gpio_direction_input(gpio); | |
151 | gpio_free(gpio); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static int __devinit egalax_firmware_version(struct i2c_client *client) | |
157 | { | |
158 | static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 }; | |
159 | int ret; | |
160 | ||
161 | ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN); | |
162 | if (ret < 0) | |
163 | return ret; | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int __devinit egalax_ts_probe(struct i2c_client *client, | |
169 | const struct i2c_device_id *id) | |
170 | { | |
171 | struct egalax_ts *ts; | |
172 | struct input_dev *input_dev; | |
173 | int ret; | |
174 | int error; | |
175 | ||
176 | ts = kzalloc(sizeof(struct egalax_ts), GFP_KERNEL); | |
177 | if (!ts) { | |
178 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
179 | return -ENOMEM; | |
180 | } | |
181 | ||
182 | input_dev = input_allocate_device(); | |
183 | if (!input_dev) { | |
184 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
185 | error = -ENOMEM; | |
186 | goto err_free_ts; | |
187 | } | |
188 | ||
189 | ts->client = client; | |
190 | ts->input_dev = input_dev; | |
191 | ||
192 | /* controller may be in sleep, wake it up. */ | |
ae495e84 HW |
193 | error = egalax_wake_up_device(client); |
194 | if (error) { | |
195 | dev_err(&client->dev, "Failed to wake up the controller\n"); | |
196 | goto err_free_dev; | |
197 | } | |
59bae1db ZJ |
198 | |
199 | ret = egalax_firmware_version(client); | |
200 | if (ret < 0) { | |
201 | dev_err(&client->dev, "Failed to read firmware version\n"); | |
202 | error = -EIO; | |
203 | goto err_free_dev; | |
204 | } | |
205 | ||
206 | input_dev->name = "EETI eGalax Touch Screen"; | |
207 | input_dev->id.bustype = BUS_I2C; | |
208 | input_dev->dev.parent = &client->dev; | |
209 | ||
210 | __set_bit(EV_ABS, input_dev->evbit); | |
211 | __set_bit(EV_KEY, input_dev->evbit); | |
212 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
213 | ||
214 | input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0); | |
215 | input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0); | |
216 | input_set_abs_params(input_dev, | |
217 | ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0); | |
218 | input_set_abs_params(input_dev, | |
219 | ABS_MT_POSITION_X, 0, EGALAX_MAX_Y, 0, 0); | |
b4adbbef | 220 | input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0); |
59bae1db ZJ |
221 | |
222 | input_set_drvdata(input_dev, ts); | |
223 | ||
224 | error = request_threaded_irq(client->irq, NULL, egalax_ts_interrupt, | |
225 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
226 | "egalax_ts", ts); | |
227 | if (error < 0) { | |
228 | dev_err(&client->dev, "Failed to register interrupt\n"); | |
229 | goto err_free_dev; | |
230 | } | |
231 | ||
232 | error = input_register_device(ts->input_dev); | |
233 | if (error) | |
234 | goto err_free_irq; | |
235 | ||
236 | i2c_set_clientdata(client, ts); | |
237 | return 0; | |
238 | ||
239 | err_free_irq: | |
240 | free_irq(client->irq, ts); | |
241 | err_free_dev: | |
242 | input_free_device(input_dev); | |
243 | err_free_ts: | |
244 | kfree(ts); | |
245 | ||
246 | return error; | |
247 | } | |
248 | ||
249 | static __devexit int egalax_ts_remove(struct i2c_client *client) | |
250 | { | |
251 | struct egalax_ts *ts = i2c_get_clientdata(client); | |
252 | ||
253 | free_irq(client->irq, ts); | |
254 | ||
255 | input_unregister_device(ts->input_dev); | |
256 | kfree(ts); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static const struct i2c_device_id egalax_ts_id[] = { | |
262 | { "egalax_ts", 0 }, | |
263 | { } | |
264 | }; | |
265 | MODULE_DEVICE_TABLE(i2c, egalax_ts_id); | |
266 | ||
267 | #ifdef CONFIG_PM_SLEEP | |
268 | static int egalax_ts_suspend(struct device *dev) | |
269 | { | |
270 | static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = { | |
271 | 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0 | |
272 | }; | |
273 | struct i2c_client *client = to_i2c_client(dev); | |
274 | int ret; | |
275 | ||
276 | ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN); | |
277 | return ret > 0 ? 0 : ret; | |
278 | } | |
279 | ||
280 | static int egalax_ts_resume(struct device *dev) | |
281 | { | |
282 | struct i2c_client *client = to_i2c_client(dev); | |
283 | ||
284 | return egalax_wake_up_device(client); | |
285 | } | |
286 | #endif | |
287 | ||
288 | static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume); | |
289 | ||
ae495e84 HW |
290 | static struct of_device_id egalax_ts_dt_ids[] = { |
291 | { .compatible = "eeti,egalax_ts" }, | |
292 | { /* sentinel */ } | |
293 | }; | |
294 | ||
59bae1db ZJ |
295 | static struct i2c_driver egalax_ts_driver = { |
296 | .driver = { | |
297 | .name = "egalax_ts", | |
298 | .owner = THIS_MODULE, | |
299 | .pm = &egalax_ts_pm_ops, | |
ae495e84 | 300 | .of_match_table = of_match_ptr(egalax_ts_dt_ids), |
59bae1db ZJ |
301 | }, |
302 | .id_table = egalax_ts_id, | |
303 | .probe = egalax_ts_probe, | |
1cb0aa88 | 304 | .remove = egalax_ts_remove, |
59bae1db ZJ |
305 | }; |
306 | ||
1b92c1cf | 307 | module_i2c_driver(egalax_ts_driver); |
59bae1db ZJ |
308 | |
309 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
310 | MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller"); | |
311 | MODULE_LICENSE("GPL"); |