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a150c1fe | 1 | // SPDX-License-Identifier: GPL-2.0 |
59bae1db ZJ |
2 | /* |
3 | * Driver for EETI eGalax Multiple Touch Controller | |
4 | * | |
5 | * Copyright (C) 2011 Freescale Semiconductor, Inc. | |
6 | * | |
7 | * based on max11801_ts.c | |
59bae1db ZJ |
8 | */ |
9 | ||
10 | /* EETI eGalax serial touch screen controller is a I2C based multiple | |
11 | * touch screen controller, it supports 5 point multiple touch. */ | |
12 | ||
13 | /* TODO: | |
14 | - auto idle mode support | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
59bae1db ZJ |
18 | #include <linux/i2c.h> |
19 | #include <linux/interrupt.h> | |
20 | #include <linux/input.h> | |
21 | #include <linux/irq.h> | |
22 | #include <linux/gpio.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/bitops.h> | |
26 | #include <linux/input/mt.h> | |
ae495e84 | 27 | #include <linux/of_gpio.h> |
59bae1db ZJ |
28 | |
29 | /* | |
30 | * Mouse Mode: some panel may configure the controller to mouse mode, | |
31 | * which can only report one point at a given time. | |
32 | * This driver will ignore events in this mode. | |
33 | */ | |
34 | #define REPORT_MODE_MOUSE 0x1 | |
35 | /* | |
36 | * Vendor Mode: this mode is used to transfer some vendor specific | |
37 | * messages. | |
38 | * This driver will ignore events in this mode. | |
39 | */ | |
40 | #define REPORT_MODE_VENDOR 0x3 | |
41 | /* Multiple Touch Mode */ | |
42 | #define REPORT_MODE_MTTOUCH 0x4 | |
43 | ||
44 | #define MAX_SUPPORT_POINTS 5 | |
45 | ||
46 | #define EVENT_VALID_OFFSET 7 | |
47 | #define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET) | |
48 | #define EVENT_ID_OFFSET 2 | |
49 | #define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET) | |
50 | #define EVENT_IN_RANGE (0x1 << 1) | |
51 | #define EVENT_DOWN_UP (0X1 << 0) | |
52 | ||
53 | #define MAX_I2C_DATA_LEN 10 | |
54 | ||
55 | #define EGALAX_MAX_X 32760 | |
56 | #define EGALAX_MAX_Y 32760 | |
57 | #define EGALAX_MAX_TRIES 100 | |
58 | ||
59 | struct egalax_ts { | |
60 | struct i2c_client *client; | |
61 | struct input_dev *input_dev; | |
62 | }; | |
63 | ||
64 | static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id) | |
65 | { | |
66 | struct egalax_ts *ts = dev_id; | |
67 | struct input_dev *input_dev = ts->input_dev; | |
68 | struct i2c_client *client = ts->client; | |
69 | u8 buf[MAX_I2C_DATA_LEN]; | |
70 | int id, ret, x, y, z; | |
71 | int tries = 0; | |
72 | bool down, valid; | |
73 | u8 state; | |
74 | ||
75 | do { | |
76 | ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN); | |
77 | } while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES); | |
78 | ||
79 | if (ret < 0) | |
80 | return IRQ_HANDLED; | |
81 | ||
82 | if (buf[0] != REPORT_MODE_MTTOUCH) { | |
83 | /* ignore mouse events and vendor events */ | |
84 | return IRQ_HANDLED; | |
85 | } | |
86 | ||
87 | state = buf[1]; | |
88 | x = (buf[3] << 8) | buf[2]; | |
89 | y = (buf[5] << 8) | buf[4]; | |
90 | z = (buf[7] << 8) | buf[6]; | |
91 | ||
92 | valid = state & EVENT_VALID_MASK; | |
93 | id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET; | |
94 | down = state & EVENT_DOWN_UP; | |
95 | ||
96 | if (!valid || id > MAX_SUPPORT_POINTS) { | |
97 | dev_dbg(&client->dev, "point invalid\n"); | |
98 | return IRQ_HANDLED; | |
99 | } | |
100 | ||
101 | input_mt_slot(input_dev, id); | |
102 | input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down); | |
103 | ||
104 | dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d", | |
105 | down ? "down" : "up", id, x, y, z); | |
106 | ||
107 | if (down) { | |
108 | input_report_abs(input_dev, ABS_MT_POSITION_X, x); | |
109 | input_report_abs(input_dev, ABS_MT_POSITION_Y, y); | |
110 | input_report_abs(input_dev, ABS_MT_PRESSURE, z); | |
111 | } | |
112 | ||
113 | input_mt_report_pointer_emulation(input_dev, true); | |
114 | input_sync(input_dev); | |
115 | ||
116 | return IRQ_HANDLED; | |
117 | } | |
118 | ||
119 | /* wake up controller by an falling edge of interrupt gpio. */ | |
120 | static int egalax_wake_up_device(struct i2c_client *client) | |
121 | { | |
ae495e84 HW |
122 | struct device_node *np = client->dev.of_node; |
123 | int gpio; | |
59bae1db ZJ |
124 | int ret; |
125 | ||
ae495e84 HW |
126 | if (!np) |
127 | return -ENODEV; | |
128 | ||
129 | gpio = of_get_named_gpio(np, "wakeup-gpios", 0); | |
130 | if (!gpio_is_valid(gpio)) | |
131 | return -ENODEV; | |
132 | ||
59bae1db ZJ |
133 | ret = gpio_request(gpio, "egalax_irq"); |
134 | if (ret < 0) { | |
135 | dev_err(&client->dev, | |
136 | "request gpio failed, cannot wake up controller: %d\n", | |
137 | ret); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | /* wake up controller via an falling edge on IRQ gpio. */ | |
142 | gpio_direction_output(gpio, 0); | |
143 | gpio_set_value(gpio, 1); | |
144 | ||
145 | /* controller should be waken up, return irq. */ | |
146 | gpio_direction_input(gpio); | |
147 | gpio_free(gpio); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
5298cc4c | 152 | static int egalax_firmware_version(struct i2c_client *client) |
59bae1db ZJ |
153 | { |
154 | static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 }; | |
155 | int ret; | |
156 | ||
157 | ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN); | |
158 | if (ret < 0) | |
159 | return ret; | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
5298cc4c | 164 | static int egalax_ts_probe(struct i2c_client *client, |
1ffb064e | 165 | const struct i2c_device_id *id) |
59bae1db ZJ |
166 | { |
167 | struct egalax_ts *ts; | |
168 | struct input_dev *input_dev; | |
59bae1db ZJ |
169 | int error; |
170 | ||
1ffb064e | 171 | ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL); |
59bae1db ZJ |
172 | if (!ts) { |
173 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
174 | return -ENOMEM; | |
175 | } | |
176 | ||
1ffb064e | 177 | input_dev = devm_input_allocate_device(&client->dev); |
59bae1db ZJ |
178 | if (!input_dev) { |
179 | dev_err(&client->dev, "Failed to allocate memory\n"); | |
1ffb064e | 180 | return -ENOMEM; |
59bae1db ZJ |
181 | } |
182 | ||
183 | ts->client = client; | |
184 | ts->input_dev = input_dev; | |
185 | ||
186 | /* controller may be in sleep, wake it up. */ | |
ae495e84 HW |
187 | error = egalax_wake_up_device(client); |
188 | if (error) { | |
189 | dev_err(&client->dev, "Failed to wake up the controller\n"); | |
1ffb064e | 190 | return error; |
ae495e84 | 191 | } |
59bae1db | 192 | |
1ffb064e AS |
193 | error = egalax_firmware_version(client); |
194 | if (error < 0) { | |
59bae1db | 195 | dev_err(&client->dev, "Failed to read firmware version\n"); |
1ffb064e | 196 | return error; |
59bae1db ZJ |
197 | } |
198 | ||
199 | input_dev->name = "EETI eGalax Touch Screen"; | |
200 | input_dev->id.bustype = BUS_I2C; | |
59bae1db ZJ |
201 | |
202 | __set_bit(EV_ABS, input_dev->evbit); | |
203 | __set_bit(EV_KEY, input_dev->evbit); | |
204 | __set_bit(BTN_TOUCH, input_dev->keybit); | |
205 | ||
206 | input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0); | |
207 | input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0); | |
208 | input_set_abs_params(input_dev, | |
209 | ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0); | |
210 | input_set_abs_params(input_dev, | |
3c9cfa78 | 211 | ABS_MT_POSITION_Y, 0, EGALAX_MAX_Y, 0, 0); |
b4adbbef | 212 | input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0); |
59bae1db | 213 | |
1ffb064e AS |
214 | error = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
215 | egalax_ts_interrupt, | |
216 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
217 | "egalax_ts", ts); | |
59bae1db ZJ |
218 | if (error < 0) { |
219 | dev_err(&client->dev, "Failed to register interrupt\n"); | |
1ffb064e | 220 | return error; |
59bae1db ZJ |
221 | } |
222 | ||
223 | error = input_register_device(ts->input_dev); | |
224 | if (error) | |
1ffb064e | 225 | return error; |
59bae1db | 226 | |
59bae1db | 227 | return 0; |
59bae1db ZJ |
228 | } |
229 | ||
230 | static const struct i2c_device_id egalax_ts_id[] = { | |
231 | { "egalax_ts", 0 }, | |
232 | { } | |
233 | }; | |
234 | MODULE_DEVICE_TABLE(i2c, egalax_ts_id); | |
235 | ||
02b6a58b | 236 | static int __maybe_unused egalax_ts_suspend(struct device *dev) |
59bae1db ZJ |
237 | { |
238 | static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = { | |
239 | 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0 | |
240 | }; | |
241 | struct i2c_client *client = to_i2c_client(dev); | |
242 | int ret; | |
243 | ||
49f62249 AH |
244 | if (device_may_wakeup(dev)) |
245 | return enable_irq_wake(client->irq); | |
246 | ||
59bae1db ZJ |
247 | ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN); |
248 | return ret > 0 ? 0 : ret; | |
249 | } | |
250 | ||
02b6a58b | 251 | static int __maybe_unused egalax_ts_resume(struct device *dev) |
59bae1db ZJ |
252 | { |
253 | struct i2c_client *client = to_i2c_client(dev); | |
254 | ||
49f62249 AH |
255 | if (device_may_wakeup(dev)) |
256 | return disable_irq_wake(client->irq); | |
257 | ||
59bae1db ZJ |
258 | return egalax_wake_up_device(client); |
259 | } | |
59bae1db ZJ |
260 | |
261 | static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume); | |
262 | ||
a5fd844c | 263 | static const struct of_device_id egalax_ts_dt_ids[] = { |
ae495e84 HW |
264 | { .compatible = "eeti,egalax_ts" }, |
265 | { /* sentinel */ } | |
266 | }; | |
02d9bd05 | 267 | MODULE_DEVICE_TABLE(of, egalax_ts_dt_ids); |
ae495e84 | 268 | |
59bae1db ZJ |
269 | static struct i2c_driver egalax_ts_driver = { |
270 | .driver = { | |
271 | .name = "egalax_ts", | |
59bae1db | 272 | .pm = &egalax_ts_pm_ops, |
085f17c6 | 273 | .of_match_table = egalax_ts_dt_ids, |
59bae1db ZJ |
274 | }, |
275 | .id_table = egalax_ts_id, | |
276 | .probe = egalax_ts_probe, | |
59bae1db ZJ |
277 | }; |
278 | ||
1b92c1cf | 279 | module_i2c_driver(egalax_ts_driver); |
59bae1db ZJ |
280 | |
281 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
282 | MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller"); | |
283 | MODULE_LICENSE("GPL"); |