Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 | /*
* Driver for Semtech SX8654 I2C touchscreen controller.
*
* Copyright (c) 2015 Armadeus Systems
* Sébastien Szymanski <sebastien.szymanski@armadeus.com>
*
* Using code from:
* - sx865x.c
* Copyright (c) 2013 U-MoBo Srl
* Pierluigi Passaro <p.passaro@u-mobo.com>
* - sx8650.c
* Copyright (c) 2009 Wayne Roberts
* - tsc2007.c
* Copyright (c) 2008 Kwangwoo Lee
* - ads7846.c
* Copyright (c) 2005 David Brownell
* Copyright (c) 2006 Nokia Corporation
* - corgi_ts.c
* Copyright (C) 2004-2005 Richard Purdie
* - omap_ts.[hc], ads7846.h, ts_osk.c
* Copyright (C) 2002 MontaVista Software
* Copyright (C) 2004 Texas Instruments
* Copyright (C) 2005 Dirk Behme
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/input.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
/* register addresses */
#define I2C_REG_TOUCH0 0x00
#define I2C_REG_TOUCH1 0x01
#define I2C_REG_CHANMASK 0x04
#define I2C_REG_IRQMASK 0x22
#define I2C_REG_IRQSRC 0x23
#define I2C_REG_SOFTRESET 0x3f
/* commands */
#define CMD_READ_REGISTER 0x40
#define CMD_MANUAL 0xc0
#define CMD_PENTRG 0xe0
/* value for I2C_REG_SOFTRESET */
#define SOFTRESET_VALUE 0xde
/* bits for I2C_REG_IRQSRC */
#define IRQ_PENTOUCH_TOUCHCONVDONE 0x08
#define IRQ_PENRELEASE 0x04
/* bits for RegTouch1 */
#define CONDIRQ 0x20
#define FILT_7SA 0x03
/* bits for I2C_REG_CHANMASK */
#define CONV_X 0x80
#define CONV_Y 0x40
/* coordinates rate: higher nibble of CTRL0 register */
#define RATE_MANUAL 0x00
#define RATE_5000CPS 0xf0
/* power delay: lower nibble of CTRL0 register */
#define POWDLY_1_1MS 0x0b
#define MAX_12BIT ((1 << 12) - 1)
struct sx8654 {
struct input_dev *input;
struct i2c_client *client;
};
static irqreturn_t sx8654_irq(int irq, void *handle)
{
struct sx8654 *sx8654 = handle;
int irqsrc;
u8 data[4];
unsigned int x, y;
int retval;
irqsrc = i2c_smbus_read_byte_data(sx8654->client,
CMD_READ_REGISTER | I2C_REG_IRQSRC);
dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);
if (irqsrc < 0)
goto out;
if (irqsrc & IRQ_PENRELEASE) {
dev_dbg(&sx8654->client->dev, "pen release interrupt");
input_report_key(sx8654->input, BTN_TOUCH, 0);
input_sync(sx8654->input);
}
if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
dev_dbg(&sx8654->client->dev, "pen touch interrupt");
retval = i2c_master_recv(sx8654->client, data, sizeof(data));
if (retval != sizeof(data))
goto out;
/* invalid data */
if (unlikely(data[0] & 0x80 || data[2] & 0x80))
goto out;
x = ((data[0] & 0xf) << 8) | (data[1]);
y = ((data[2] & 0xf) << 8) | (data[3]);
input_report_abs(sx8654->input, ABS_X, x);
input_report_abs(sx8654->input, ABS_Y, y);
input_report_key(sx8654->input, BTN_TOUCH, 1);
input_sync(sx8654->input);
dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
}
out:
return IRQ_HANDLED;
}
static int sx8654_open(struct input_dev *dev)
{
struct sx8654 *sx8654 = input_get_drvdata(dev);
struct i2c_client *client = sx8654->client;
int error;
/* enable pen trigger mode */
error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
RATE_5000CPS | POWDLY_1_1MS);
if (error) {
dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
return error;
}
error = i2c_smbus_write_byte(client, CMD_PENTRG);
if (error) {
dev_err(&client->dev, "writing command CMD_PENTRG failed");
return error;
}
enable_irq(client->irq);
return 0;
}
static void sx8654_close(struct input_dev *dev)
{
struct sx8654 *sx8654 = input_get_drvdata(dev);
struct i2c_client *client = sx8654->client;
int error;
disable_irq(client->irq);
/* enable manual mode mode */
error = i2c_smbus_write_byte(client, CMD_MANUAL);
if (error) {
dev_err(&client->dev, "writing command CMD_MANUAL failed");
return;
}
error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, 0);
if (error) {
dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
return;
}
}
static int sx8654_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct sx8654 *sx8654;
struct input_dev *input;
int error;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -ENXIO;
sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
if (!sx8654)
return -ENOMEM;
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;
input->name = "SX8654 I2C Touchscreen";
input->id.bustype = BUS_I2C;
input->dev.parent = &client->dev;
input->open = sx8654_open;
input->close = sx8654_close;
__set_bit(INPUT_PROP_DIRECT, input->propbit);
input_set_capability(input, EV_KEY, BTN_TOUCH);
input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);
sx8654->client = client;
sx8654->input = input;
input_set_drvdata(sx8654->input, sx8654);
error = i2c_smbus_write_byte_data(client, I2C_REG_SOFTRESET,
SOFTRESET_VALUE);
if (error) {
dev_err(&client->dev, "writing softreset value failed");
return error;
}
error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
CONV_X | CONV_Y);
if (error) {
dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
return error;
}
error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
IRQ_PENTOUCH_TOUCHCONVDONE |
IRQ_PENRELEASE);
if (error) {
dev_err(&client->dev, "writing to I2C_REG_IRQMASK failed");
return error;
}
error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
CONDIRQ | FILT_7SA);
if (error) {
dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
return error;
}
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, sx8654_irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
client->name, sx8654);
if (error) {
dev_err(&client->dev,
"Failed to enable IRQ %d, error: %d\n",
client->irq, error);
return error;
}
/* Disable the IRQ, we'll enable it in sx8654_open() */
disable_irq(client->irq);
error = input_register_device(sx8654->input);
if (error)
return error;
i2c_set_clientdata(client, sx8654);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id sx8654_of_match[] = {
{ .compatible = "semtech,sx8654", },
{ },
};
MODULE_DEVICE_TABLE(of, sx8654_of_match);
#endif
static const struct i2c_device_id sx8654_id_table[] = {
{ "semtech_sx8654", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, sx8654_id_table);
static struct i2c_driver sx8654_driver = {
.driver = {
.name = "sx8654",
.of_match_table = of_match_ptr(sx8654_of_match),
},
.id_table = sx8654_id_table,
.probe = sx8654_probe,
};
module_i2c_driver(sx8654_driver);
MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
MODULE_LICENSE("GPL");
|