Input: cyttsp4 - I2C driver for Cypress TMA4XX touchscreen devices

Cypress TrueTouch(tm) Standard Product controllers,
Generation4 devices, I2C adapter module.

This driver adds communication support with TTSP controller
using I2C bus.

Signed-off-by: Ferruh Yigit <fery@cypress.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

3 files changed, 100 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 66df8df88140..1645e8e4e788 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -179,6 +179,15 @@ config TOUCHSCREEN_CYTTSP4_CORE
 
           To compile this driver as a module, choose M here.
 
+config TOUCHSCREEN_CYTTSP4_I2C
+        tristate "support I2C bus connection"
+        depends on TOUCHSCREEN_CYTTSP4_CORE && I2C
+        help
+          Say Y here if the touchscreen is connected via I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cyttsp4_i2c.
+
 config TOUCHSCREEN_DA9034
         tristate "Touchscreen support for Dialog Semiconductor DA9034"
         depends on PMIC_DA903X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index f44500674c32..1ef807c7d870 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE)	+= cyttsp_core.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C)    += cyttsp_i2c.o cyttsp_i2c_common.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI)    += cyttsp_spi.o
 obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_CORE)  += cyttsp4_core.o
+obj-$(CONFIG_TOUCHSCREEN_CYTTSP4_I2C)   += cyttsp4_i2c.o cyttsp_i2c_common.o
 obj-$(CONFIG_TOUCHSCREEN_DA9034)        += da9034-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DA9052)        += da9052_tsi.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)       += dynapro.o
diff --git a/drivers/input/touchscreen/cyttsp4_i2c.c b/drivers/input/touchscreen/cyttsp4_i2c.c
new file mode 100644
index 000000000000..8e2012c79058
--- /dev/null
+++ b/drivers/input/touchscreen/cyttsp4_i2c.c
@@ -0,0 +1,90 @@
+/*
+ * cyttsp_i2c.c
+ * Cypress TrueTouch(TM) Standard Product (TTSP) I2C touchscreen driver.
+ * For use with Cypress  Txx4xx parts.
+ * Supported parts include:
+ * TMA4XX
+ * TMA1036
+ *
+ * Copyright (C) 2009, 2010, 2011 Cypress Semiconductor, Inc.
+ * Copyright (C) 2012 Javier Martinez Canillas <javier@dowhile0.org>
+ * Copyright (C) 2013 Cypress Semiconductor
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2, and only version 2, as published by the
+ * Free Software Foundation.
+ *
+ * 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.
+ *
+ * Contact Cypress Semiconductor at www.cypress.com <ttdrivers@cypress.com>
+ *
+ */
+
+#include "cyttsp4_core.h"
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+
+#define CYTTSP4_I2C_DATA_SIZE   (3 * 256)
+
+static const struct cyttsp4_bus_ops cyttsp4_i2c_bus_ops = {
+        .bustype        = BUS_I2C,
+        .write          = cyttsp_i2c_write_block_data,
+        .read           = cyttsp_i2c_read_block_data,
+};
+
+static int cyttsp4_i2c_probe(struct i2c_client *client,
+                                      const struct i2c_device_id *id)
+{
+        struct cyttsp4 *ts;
+
+        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+                dev_err(&client->dev, "I2C functionality not Supported\n");
+                return -EIO;
+        }
+
+        ts = cyttsp4_probe(&cyttsp4_i2c_bus_ops, &client->dev, client->irq,
+                          CYTTSP4_I2C_DATA_SIZE);
+
+        if (IS_ERR(ts))
+                return PTR_ERR(ts);
+
+        return 0;
+}
+
+static int cyttsp4_i2c_remove(struct i2c_client *client)
+{
+        struct cyttsp4 *ts = i2c_get_clientdata(client);
+
+        cyttsp4_remove(ts);
+
+        return 0;
+}
+
+static const struct i2c_device_id cyttsp4_i2c_id[] = {
+        { CYTTSP4_I2C_NAME, 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, cyttsp4_i2c_id);
+
+static struct i2c_driver cyttsp4_i2c_driver = {
+        .driver = {
+                .name   = CYTTSP4_I2C_NAME,
+                .owner  = THIS_MODULE,
+                .pm     = &cyttsp4_pm_ops,
+        },
+        .probe          = cyttsp4_i2c_probe,
+        .remove         = cyttsp4_i2c_remove,
+        .id_table       = cyttsp4_i2c_id,
+};
+
+module_i2c_driver(cyttsp4_i2c_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
+MODULE_AUTHOR("Cypress");
+MODULE_ALIAS("i2c:cyttsp4");