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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 | ||
5298cc4c | 156 | static int egalax_firmware_version(struct i2c_client *client) |
59bae1db ZJ |
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 | ||
5298cc4c | 168 | static int egalax_ts_probe(struct i2c_client *client, |
1ffb064e | 169 | const struct i2c_device_id *id) |
59bae1db ZJ |
170 | { |
171 | struct egalax_ts *ts; | |
172 | struct input_dev *input_dev; | |
59bae1db ZJ |
173 | int error; |
174 | ||
1ffb064e | 175 | ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL); |
59bae1db ZJ |
176 | if (!ts) { |
177 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
178 | return -ENOMEM; | |
179 | } | |
180 | ||
1ffb064e | 181 | input_dev = devm_input_allocate_device(&client->dev); |
59bae1db ZJ |
182 | if (!input_dev) { |
183 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
1ffb064e | 184 | return -ENOMEM; |
59bae1db ZJ |
185 | } |
186 | ||
187 | ts->client = client; | |
188 | ts->input_dev = input_dev; | |
189 | ||
190 | /* controller may be in sleep, wake it up. */ | |
ae495e84 HW |
191 | error = egalax_wake_up_device(client); |
192 | if (error) { | |
193 | dev_err(&client->dev, "Failed to wake up the controller\n"); | |
1ffb064e | 194 | return error; |
ae495e84 | 195 | } |
59bae1db | 196 | |
1ffb064e AS |
197 | error = egalax_firmware_version(client); |
198 | if (error < 0) { | |
59bae1db | 199 | dev_err(&client->dev, "Failed to read firmware version\n"); |
1ffb064e | 200 | return error; |
59bae1db ZJ |
201 | } |
202 | ||
203 | input_dev->name = "EETI eGalax Touch Screen"; | |
204 | input_dev->id.bustype = BUS_I2C; | |
59bae1db ZJ |
205 | |
206 | __set_bit(EV_ABS, input_dev->evbit); | |
207 | __set_bit(EV_KEY, input_dev->evbit); | |
208 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
209 | ||
210 | input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0); | |
211 | input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0); | |
212 | input_set_abs_params(input_dev, | |
213 | ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0); | |
214 | input_set_abs_params(input_dev, | |
3c9cfa78 | 215 | ABS_MT_POSITION_Y, 0, EGALAX_MAX_Y, 0, 0); |
b4adbbef | 216 | input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0); |
59bae1db ZJ |
217 | |
218 | input_set_drvdata(input_dev, ts); | |
219 | ||
1ffb064e AS |
220 | error = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
221 | egalax_ts_interrupt, | |
222 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
223 | "egalax_ts", ts); | |
59bae1db ZJ |
224 | if (error < 0) { |
225 | dev_err(&client->dev, "Failed to register interrupt\n"); | |
1ffb064e | 226 | return error; |
59bae1db ZJ |
227 | } |
228 | ||
229 | error = input_register_device(ts->input_dev); | |
230 | if (error) | |
1ffb064e | 231 | return error; |
59bae1db ZJ |
232 | |
233 | i2c_set_clientdata(client, ts); | |
234 | return 0; | |
59bae1db ZJ |
235 | } |
236 | ||
237 | static const struct i2c_device_id egalax_ts_id[] = { | |
238 | { "egalax_ts", 0 }, | |
239 | { } | |
240 | }; | |
241 | MODULE_DEVICE_TABLE(i2c, egalax_ts_id); | |
242 | ||
243 | #ifdef CONFIG_PM_SLEEP | |
244 | static int egalax_ts_suspend(struct device *dev) | |
245 | { | |
246 | static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = { | |
247 | 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0 | |
248 | }; | |
249 | struct i2c_client *client = to_i2c_client(dev); | |
250 | int ret; | |
251 | ||
252 | ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN); | |
253 | return ret > 0 ? 0 : ret; | |
254 | } | |
255 | ||
256 | static int egalax_ts_resume(struct device *dev) | |
257 | { | |
258 | struct i2c_client *client = to_i2c_client(dev); | |
259 | ||
260 | return egalax_wake_up_device(client); | |
261 | } | |
262 | #endif | |
263 | ||
264 | static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume); | |
265 | ||
ae495e84 HW |
266 | static struct of_device_id egalax_ts_dt_ids[] = { |
267 | { .compatible = "eeti,egalax_ts" }, | |
268 | { /* sentinel */ } | |
269 | }; | |
270 | ||
59bae1db ZJ |
271 | static struct i2c_driver egalax_ts_driver = { |
272 | .driver = { | |
273 | .name = "egalax_ts", | |
274 | .owner = THIS_MODULE, | |
275 | .pm = &egalax_ts_pm_ops, | |
ae495e84 | 276 | .of_match_table = of_match_ptr(egalax_ts_dt_ids), |
59bae1db ZJ |
277 | }, |
278 | .id_table = egalax_ts_id, | |
279 | .probe = egalax_ts_probe, | |
59bae1db ZJ |
280 | }; |
281 | ||
1b92c1cf | 282 | module_i2c_driver(egalax_ts_driver); |
59bae1db ZJ |
283 | |
284 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
285 | MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller"); | |
286 | MODULE_LICENSE("GPL"); |