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>

4 files changed, 125 insertions, 6 deletions

diff --git a/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
index 09089a6d69ed..b80c04b0e5c0 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/tsc2005.txt
@@ -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";
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 6b2de5345e66..2ccc52236c15 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -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
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 03179f28c259..cbaa6abb08da 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -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
diff --git a/drivers/input/touchscreen/tsc2004.c b/drivers/input/touchscreen/tsc2004.c
new file mode 100644
index 000000000000..7295c198aa08
--- /dev/null
+++ b/drivers/input/touchscreen/tsc2004.c
@@ -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");