2 * Driver for Semtech SX8654 I2C touchscreen controller.
4 * Copyright (c) 2015 Armadeus Systems
5 * Sébastien Szymanski <sebastien.szymanski@armadeus.com>
9 * Copyright (c) 2013 U-MoBo Srl
10 * Pierluigi Passaro <p.passaro@u-mobo.com>
12 * Copyright (c) 2009 Wayne Roberts
14 * Copyright (c) 2008 Kwangwoo Lee
16 * Copyright (c) 2005 David Brownell
17 * Copyright (c) 2006 Nokia Corporation
19 * Copyright (C) 2004-2005 Richard Purdie
20 * - omap_ts.[hc], ads7846.h, ts_osk.c
21 * Copyright (C) 2002 MontaVista Software
22 * Copyright (C) 2004 Texas Instruments
23 * Copyright (C) 2005 Dirk Behme
25 * This program is free software; you can redistribute it and/or modify
26 * it under the terms of the GNU General Public License version 2 as
27 * published by the Free Software Foundation.
30 #include <linux/input.h>
31 #include <linux/module.h>
33 #include <linux/i2c.h>
34 #include <linux/interrupt.h>
35 #include <linux/irq.h>
37 /* register addresses */
38 #define I2C_REG_TOUCH0 0x00
39 #define I2C_REG_TOUCH1 0x01
40 #define I2C_REG_CHANMASK 0x04
41 #define I2C_REG_IRQMASK 0x22
42 #define I2C_REG_IRQSRC 0x23
43 #define I2C_REG_SOFTRESET 0x3f
46 #define CMD_READ_REGISTER 0x40
47 #define CMD_MANUAL 0xc0
48 #define CMD_PENTRG 0xe0
50 /* value for I2C_REG_SOFTRESET */
51 #define SOFTRESET_VALUE 0xde
53 /* bits for I2C_REG_IRQSRC */
54 #define IRQ_PENTOUCH_TOUCHCONVDONE 0x08
55 #define IRQ_PENRELEASE 0x04
57 /* bits for RegTouch1 */
61 /* bits for I2C_REG_CHANMASK */
65 /* coordinates rate: higher nibble of CTRL0 register */
66 #define RATE_MANUAL 0x00
67 #define RATE_5000CPS 0xf0
69 /* power delay: lower nibble of CTRL0 register */
70 #define POWDLY_1_1MS 0x0b
72 #define MAX_12BIT ((1 << 12) - 1)
75 struct input_dev *input;
76 struct i2c_client *client;
79 static irqreturn_t sx8654_irq(int irq, void *handle)
81 struct sx8654 *sx8654 = handle;
87 irqsrc = i2c_smbus_read_byte_data(sx8654->client,
88 CMD_READ_REGISTER | I2C_REG_IRQSRC);
89 dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);
94 if (irqsrc & IRQ_PENRELEASE) {
95 dev_dbg(&sx8654->client->dev, "pen release interrupt");
97 input_report_key(sx8654->input, BTN_TOUCH, 0);
98 input_sync(sx8654->input);
101 if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
102 dev_dbg(&sx8654->client->dev, "pen touch interrupt");
104 retval = i2c_master_recv(sx8654->client, data, sizeof(data));
105 if (retval != sizeof(data))
109 if (unlikely(data[0] & 0x80 || data[2] & 0x80))
112 x = ((data[0] & 0xf) << 8) | (data[1]);
113 y = ((data[2] & 0xf) << 8) | (data[3]);
115 input_report_abs(sx8654->input, ABS_X, x);
116 input_report_abs(sx8654->input, ABS_Y, y);
117 input_report_key(sx8654->input, BTN_TOUCH, 1);
118 input_sync(sx8654->input);
120 dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
127 static int sx8654_open(struct input_dev *dev)
129 struct sx8654 *sx8654 = input_get_drvdata(dev);
130 struct i2c_client *client = sx8654->client;
133 /* enable pen trigger mode */
134 error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
135 RATE_5000CPS | POWDLY_1_1MS);
137 dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
141 error = i2c_smbus_write_byte(client, CMD_PENTRG);
143 dev_err(&client->dev, "writing command CMD_PENTRG failed");
147 enable_irq(client->irq);
152 static void sx8654_close(struct input_dev *dev)
154 struct sx8654 *sx8654 = input_get_drvdata(dev);
155 struct i2c_client *client = sx8654->client;
158 disable_irq(client->irq);
160 /* enable manual mode mode */
161 error = i2c_smbus_write_byte(client, CMD_MANUAL);
163 dev_err(&client->dev, "writing command CMD_MANUAL failed");
167 error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
169 dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
174 static int sx8654_probe(struct i2c_client *client,
175 const struct i2c_device_id *id)
177 struct sx8654 *sx8654;
178 struct input_dev *input;
181 if (!i2c_check_functionality(client->adapter,
182 I2C_FUNC_SMBUS_READ_WORD_DATA))
185 sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
189 input = devm_input_allocate_device(&client->dev);
193 input->name = "SX8654 I2C Touchscreen";
194 input->id.bustype = BUS_I2C;
195 input->dev.parent = &client->dev;
196 input->open = sx8654_open;
197 input->close = sx8654_close;
199 __set_bit(INPUT_PROP_DIRECT, input->propbit);
200 input_set_capability(input, EV_KEY, BTN_TOUCH);
201 input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
202 input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);
204 sx8654->client = client;
205 sx8654->input = input;
207 input_set_drvdata(sx8654->input, sx8654);
209 error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
212 dev_err(&client->dev, "writing softreset value failed");
216 error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
219 dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
223 error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
224 IRQ_PENTOUCH_TOUCHCONVDONE |
227 dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
231 error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
234 dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
238 error = devm_request_threaded_irq(&client->dev, client->irq,
240 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
241 client->name, sx8654);
243 dev_err(&client->dev,
244 "Failed to enable IRQ %d, error: %d\n",
249 /* Disable the IRQ, we'll enable it in sx8654_open() */
250 disable_irq(client->irq);
252 error = input_register_device(sx8654->input);
256 i2c_set_clientdata(client, sx8654);
261 static const struct of_device_id sx8654_of_match[] = {
262 { .compatible = "semtech,sx8654", },
265 MODULE_DEVICE_TABLE(of, sx8654_of_match);
268 static const struct i2c_device_id sx8654_id_table[] = {
269 { "semtech_sx8654", 0 },
272 MODULE_DEVICE_TABLE(i2c, sx8654_id_table);
274 static struct i2c_driver sx8654_driver = {
277 .of_match_table = of_match_ptr(sx8654_of_match),
279 .id_table = sx8654_id_table,
280 .probe = sx8654_probe,
282 module_i2c_driver(sx8654_driver);
284 MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
285 MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
286 MODULE_LICENSE("GPL");