Input: tsc2004 - add support for tsc2004

This adds support for the i2c based tsc2004 touchscreen controller.

Signed-off-by: Michael Welling <mwelling@ieee.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Michael Welling 2015-11-02 22:54:23 -08:00 committed by Dmitry Torokhov
parent ef3b98c2c3
commit a748941c95
4 changed files with 125 additions and 6 deletions

View file

@ -1,14 +1,15 @@
* Texas Instruments tsc2005 touchscreen controller
* Texas Instruments tsc2004 and tsc2005 touchscreen controllers
Required properties:
- compatible : "ti,tsc2005"
- reg : SPI device address
- spi-max-frequency : Maximal SPI speed
- compatible : "ti,tsc2004" or "ti,tsc2005"
- reg : Device address
- interrupts : IRQ specifier
- reset-gpios : GPIO specifier
- vio-supply : Regulator specifier
- spi-max-frequency : Maximum SPI clocking speed of the device
(for tsc2005)
Optional properties:
- vio-supply : Regulator specifier
- reset-gpios : GPIO specifier for the controller reset line
- ti,x-plate-ohms : integer, resistance of the touchscreen's X plates
in ohm (defaults to 280)
- ti,esd-recovery-timeout-ms : integer, if the touchscreen does not respond after
@ -18,6 +19,27 @@ Optional properties:
Example:
&i2c3 {
tsc2004@48 {
compatible = "ti,tsc2004";
reg = <0x48>;
vio-supply = <&vio>;
reset-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>;
interrupts-extended = <&gpio1 27 IRQ_TYPE_EDGE_RISING>;
touchscreen-fuzz-x = <4>;
touchscreen-fuzz-y = <7>;
touchscreen-fuzz-pressure = <2>;
touchscreen-size-x = <4096>;
touchscreen-size-y = <4096>;
touchscreen-max-pressure = <2048>;
ti,x-plate-ohms = <280>;
ti,esd-recovery-timeout-ms = <8000>;
};
}
&mcspi1 {
tsc2005@0 {
compatible = "ti,tsc2005";

View file

@ -942,6 +942,19 @@ config TOUCHSCREEN_TSC_SERIO
config TOUCHSCREEN_TSC200X_CORE
tristate
config TOUCHSCREEN_TSC2004
tristate "TSC2004 based touchscreens"
depends on I2C
select REGMAP_I2C
select TOUCHSCREEN_TSC200X_CORE
help
Say Y here if you have a TSC2004 based touchscreen.
If unsure, say N.
To compile this driver as a module, choose M here: the
module will be called tsc2004.
config TOUCHSCREEN_TSC2005
tristate "TSC2005 based touchscreens"
depends on SPI_MASTER

View file

@ -70,6 +70,7 @@ obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
obj-$(CONFIG_TOUCHSCREEN_TSC_SERIO) += tsc40.o
obj-$(CONFIG_TOUCHSCREEN_TSC200X_CORE) += tsc200x-core.o
obj-$(CONFIG_TOUCHSCREEN_TSC2004) += tsc2004.o
obj-$(CONFIG_TOUCHSCREEN_TSC2005) += tsc2005.o
obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o

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@ -0,0 +1,83 @@
/*
* TSC2004 touchscreen driver
*
* Copyright (C) 2015 QWERTY Embedded Design
* Copyright (C) 2015 EMAC Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/input.h>
#include <linux/of.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include "tsc200x-core.h"
static int tsc2004_cmd(struct device *dev, u8 cmd)
{
u8 tx = TSC200X_CMD | TSC200X_CMD_12BIT | cmd;
s32 data;
struct i2c_client *i2c = to_i2c_client(dev);
data = i2c_smbus_write_byte(i2c, tx);
if (data < 0) {
dev_err(dev, "%s: failed, command: %x i2c error: %d\n",
__func__, cmd, data);
return data;
}
return 0;
}
static int tsc2004_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
return tsc200x_probe(&i2c->dev, i2c->irq, BUS_I2C,
devm_regmap_init_i2c(i2c, &tsc200x_regmap_config),
tsc2004_cmd);
}
static int tsc2004_remove(struct i2c_client *i2c)
{
return tsc200x_remove(&i2c->dev);
}
static const struct i2c_device_id tsc2004_idtable[] = {
{ "tsc2004", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, tsc2004_idtable);
#ifdef CONFIG_OF
static const struct of_device_id tsc2004_of_match[] = {
{ .compatible = "ti,tsc2004" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tsc2004_of_match);
#endif
static struct i2c_driver tsc2004_driver = {
.driver = {
.name = "tsc2004",
.of_match_table = of_match_ptr(tsc2004_of_match),
.pm = &tsc200x_pm_ops,
},
.id_table = tsc2004_idtable,
.probe = tsc2004_probe,
.remove = tsc2004_remove,
};
module_i2c_driver(tsc2004_driver);
MODULE_AUTHOR("Michael Welling <mwelling@ieee.org>");
MODULE_DESCRIPTION("TSC2004 Touchscreen Driver");
MODULE_LICENSE("GPL");