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Zhang Jiejing59bae1d2011-11-12 00:03:18 -08001/*
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>
31
32/*
33 * Mouse Mode: some panel may configure the controller to mouse mode,
34 * which can only report one point at a given time.
35 * This driver will ignore events in this mode.
36 */
37#define REPORT_MODE_MOUSE 0x1
38/*
39 * Vendor Mode: this mode is used to transfer some vendor specific
40 * messages.
41 * This driver will ignore events in this mode.
42 */
43#define REPORT_MODE_VENDOR 0x3
44/* Multiple Touch Mode */
45#define REPORT_MODE_MTTOUCH 0x4
46
47#define MAX_SUPPORT_POINTS 5
48
49#define EVENT_VALID_OFFSET 7
50#define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET)
51#define EVENT_ID_OFFSET 2
52#define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET)
53#define EVENT_IN_RANGE (0x1 << 1)
54#define EVENT_DOWN_UP (0X1 << 0)
55
56#define MAX_I2C_DATA_LEN 10
57
58#define EGALAX_MAX_X 32760
59#define EGALAX_MAX_Y 32760
60#define EGALAX_MAX_TRIES 100
61
62struct egalax_ts {
63 struct i2c_client *client;
64 struct input_dev *input_dev;
65};
66
67static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
68{
69 struct egalax_ts *ts = dev_id;
70 struct input_dev *input_dev = ts->input_dev;
71 struct i2c_client *client = ts->client;
72 u8 buf[MAX_I2C_DATA_LEN];
73 int id, ret, x, y, z;
74 int tries = 0;
75 bool down, valid;
76 u8 state;
77
78 do {
79 ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN);
80 } while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES);
81
82 if (ret < 0)
83 return IRQ_HANDLED;
84
85 if (buf[0] != REPORT_MODE_MTTOUCH) {
86 /* ignore mouse events and vendor events */
87 return IRQ_HANDLED;
88 }
89
90 state = buf[1];
91 x = (buf[3] << 8) | buf[2];
92 y = (buf[5] << 8) | buf[4];
93 z = (buf[7] << 8) | buf[6];
94
95 valid = state & EVENT_VALID_MASK;
96 id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET;
97 down = state & EVENT_DOWN_UP;
98
99 if (!valid || id > MAX_SUPPORT_POINTS) {
100 dev_dbg(&client->dev, "point invalid\n");
101 return IRQ_HANDLED;
102 }
103
104 input_mt_slot(input_dev, id);
105 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down);
106
107 dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d",
108 down ? "down" : "up", id, x, y, z);
109
110 if (down) {
111 input_report_abs(input_dev, ABS_MT_POSITION_X, x);
112 input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
113 input_report_abs(input_dev, ABS_MT_PRESSURE, z);
114 }
115
116 input_mt_report_pointer_emulation(input_dev, true);
117 input_sync(input_dev);
118
119 return IRQ_HANDLED;
120}
121
122/* wake up controller by an falling edge of interrupt gpio. */
123static int egalax_wake_up_device(struct i2c_client *client)
124{
125 int gpio = irq_to_gpio(client->irq);
126 int ret;
127
128 ret = gpio_request(gpio, "egalax_irq");
129 if (ret < 0) {
130 dev_err(&client->dev,
131 "request gpio failed, cannot wake up controller: %d\n",
132 ret);
133 return ret;
134 }
135
136 /* wake up controller via an falling edge on IRQ gpio. */
137 gpio_direction_output(gpio, 0);
138 gpio_set_value(gpio, 1);
139
140 /* controller should be waken up, return irq. */
141 gpio_direction_input(gpio);
142 gpio_free(gpio);
143
144 return 0;
145}
146
147static int __devinit egalax_firmware_version(struct i2c_client *client)
148{
149 static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 };
150 int ret;
151
152 ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN);
153 if (ret < 0)
154 return ret;
155
156 return 0;
157}
158
159static int __devinit egalax_ts_probe(struct i2c_client *client,
160 const struct i2c_device_id *id)
161{
162 struct egalax_ts *ts;
163 struct input_dev *input_dev;
164 int ret;
165 int error;
166
167 ts = kzalloc(sizeof(struct egalax_ts), GFP_KERNEL);
168 if (!ts) {
169 dev_err(&client->dev, "Failed to allocate memory\n");
170 return -ENOMEM;
171 }
172
173 input_dev = input_allocate_device();
174 if (!input_dev) {
175 dev_err(&client->dev, "Failed to allocate memory\n");
176 error = -ENOMEM;
177 goto err_free_ts;
178 }
179
180 ts->client = client;
181 ts->input_dev = input_dev;
182
183 /* controller may be in sleep, wake it up. */
184 egalax_wake_up_device(client);
185
186 ret = egalax_firmware_version(client);
187 if (ret < 0) {
188 dev_err(&client->dev, "Failed to read firmware version\n");
189 error = -EIO;
190 goto err_free_dev;
191 }
192
193 input_dev->name = "EETI eGalax Touch Screen";
194 input_dev->id.bustype = BUS_I2C;
195 input_dev->dev.parent = &client->dev;
196
197 __set_bit(EV_ABS, input_dev->evbit);
198 __set_bit(EV_KEY, input_dev->evbit);
199 __set_bit(BTN_TOUCH, input_dev->keybit);
200
201 input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0);
202 input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0);
203 input_set_abs_params(input_dev,
204 ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0);
205 input_set_abs_params(input_dev,
206 ABS_MT_POSITION_X, 0, EGALAX_MAX_Y, 0, 0);
207 input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS);
208
209 input_set_drvdata(input_dev, ts);
210
211 error = request_threaded_irq(client->irq, NULL, egalax_ts_interrupt,
212 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
213 "egalax_ts", ts);
214 if (error < 0) {
215 dev_err(&client->dev, "Failed to register interrupt\n");
216 goto err_free_dev;
217 }
218
219 error = input_register_device(ts->input_dev);
220 if (error)
221 goto err_free_irq;
222
223 i2c_set_clientdata(client, ts);
224 return 0;
225
226err_free_irq:
227 free_irq(client->irq, ts);
228err_free_dev:
229 input_free_device(input_dev);
230err_free_ts:
231 kfree(ts);
232
233 return error;
234}
235
236static __devexit int egalax_ts_remove(struct i2c_client *client)
237{
238 struct egalax_ts *ts = i2c_get_clientdata(client);
239
240 free_irq(client->irq, ts);
241
242 input_unregister_device(ts->input_dev);
243 kfree(ts);
244
245 return 0;
246}
247
248static const struct i2c_device_id egalax_ts_id[] = {
249 { "egalax_ts", 0 },
250 { }
251};
252MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
253
254#ifdef CONFIG_PM_SLEEP
255static int egalax_ts_suspend(struct device *dev)
256{
257 static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = {
258 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0
259 };
260 struct i2c_client *client = to_i2c_client(dev);
261 int ret;
262
263 ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
264 return ret > 0 ? 0 : ret;
265}
266
267static int egalax_ts_resume(struct device *dev)
268{
269 struct i2c_client *client = to_i2c_client(dev);
270
271 return egalax_wake_up_device(client);
272}
273#endif
274
275static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
276
277static struct i2c_driver egalax_ts_driver = {
278 .driver = {
279 .name = "egalax_ts",
280 .owner = THIS_MODULE,
281 .pm = &egalax_ts_pm_ops,
282 },
283 .id_table = egalax_ts_id,
284 .probe = egalax_ts_probe,
285 .remove = __devexit_p(egalax_ts_remove),
286};
287
Axel Lin1b92c1c2012-03-16 23:05:41 -0700288module_i2c_driver(egalax_ts_driver);
Zhang Jiejing59bae1d2011-11-12 00:03:18 -0800289
290MODULE_AUTHOR("Freescale Semiconductor, Inc.");
291MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller");
292MODULE_LICENSE("GPL");