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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#include <linux/of_gpio.h>
32
33
34
35
36
37
38#define REPORT_MODE_MOUSE 0x1
39
40
41
42
43
44#define REPORT_MODE_VENDOR 0x3
45
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
63struct egalax_ts {
64 struct i2c_client *client;
65 struct input_dev *input_dev;
66};
67
68static 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
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
124static int egalax_wake_up_device(struct i2c_client *client)
125{
126 struct device_node *np = client->dev.of_node;
127 int gpio;
128 int ret;
129
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
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
146 gpio_direction_output(gpio, 0);
147 gpio_set_value(gpio, 1);
148
149
150 gpio_direction_input(gpio);
151 gpio_free(gpio);
152
153 return 0;
154}
155
156static int 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
168static int 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
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 }
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);
220 input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0);
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
239err_free_irq:
240 free_irq(client->irq, ts);
241err_free_dev:
242 input_free_device(input_dev);
243err_free_ts:
244 kfree(ts);
245
246 return error;
247}
248
249static 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
261static const struct i2c_device_id egalax_ts_id[] = {
262 { "egalax_ts", 0 },
263 { }
264};
265MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
266
267#ifdef CONFIG_PM_SLEEP
268static 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
280static 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
288static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume);
289
290static struct of_device_id egalax_ts_dt_ids[] = {
291 { .compatible = "eeti,egalax_ts" },
292 { }
293};
294
295static struct i2c_driver egalax_ts_driver = {
296 .driver = {
297 .name = "egalax_ts",
298 .owner = THIS_MODULE,
299 .pm = &egalax_ts_pm_ops,
300 .of_match_table = of_match_ptr(egalax_ts_dt_ids),
301 },
302 .id_table = egalax_ts_id,
303 .probe = egalax_ts_probe,
304 .remove = egalax_ts_remove,
305};
306
307module_i2c_driver(egalax_ts_driver);
308
309MODULE_AUTHOR("Freescale Semiconductor, Inc.");
310MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller");
311MODULE_LICENSE("GPL");
312
