Input: add Analog Devices AD714x captouch input driver

AD7142 and AD7147 are integrated capacitance-to-digital converters
(CDCs) with on-chip environmental calibration for use in systems
requiring a novel user input method. The AD7142 and AD7147 can interface
to external capacitance sensors implementing functions such as buttons,
scrollwheels, sliders, touchpads and so on.

The chips don't restrict the specific usage. Depending on the hardware
connection, one special target board can include one or several these
components. The platform_data for the device's "struct device" holds
these information. The data-struct defined in head file descript the
hardware feature of button/scrollwheel/slider/touchpad components on
target boards, which need be filled in the arch/mach-/.

As the result, the driver is independent of boards. It gets the
components layout from the platform_data, registers related devices,
fullfills the algorithms and state machines for these components and
report related input events to up level.

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Barry Song <21cnbao@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

6 files changed, 1630 insertions, 0 deletions

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 54a9c2d0ba1c..a4b9dc5cf456 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -22,6 +22,36 @@ config INPUT_88PM860X_ONKEY
           To compile this driver as a module, choose M here: the module
           will be called 88pm860x_onkey.
 
+config INPUT_AD714X
+        tristate "Analog Devices AD714x Capacitance Touch Sensor"
+        help
+          Say Y here if you want to support an AD7142/AD7147 touch sensor.
+
+          You should select a bus connection too.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ad714x.
+
+config INPUT_AD714X_I2C
+        tristate "support I2C bus connection"
+        depends on INPUT_AD714X && I2C
+        default y
+        help
+          Say Y here if you have AD7142/AD7147 hooked to an I2C bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ad714x-i2c.
+
+config INPUT_AD714X_SPI
+        tristate "support SPI bus connection"
+        depends on INPUT_AD714X && SPI
+        default y
+        help
+          Say Y here if you have AD7142/AD7147 hooked to a SPI bus.
+
+          To compile this driver as a module, choose M here: the
+          module will be called ad714x-spi.
+
 config INPUT_PCSPKR
         tristate "PC Speaker support"
         depends on PCSPKR_PLATFORM
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index a662df21bf57..f9f577031e06 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -5,6 +5,9 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_INPUT_88PM860X_ONKEY)      += 88pm860x_onkey.o
+obj-$(CONFIG_INPUT_AD714X)              += ad714x.o
+obj-$(CONFIG_INPUT_AD714X_I2C)          += ad714x-i2c.o
+obj-$(CONFIG_INPUT_AD714X_SPI)          += ad714x-spi.o
 obj-$(CONFIG_INPUT_APANEL)              += apanel.o
 obj-$(CONFIG_INPUT_ATI_REMOTE)          += ati_remote.o
 obj-$(CONFIG_INPUT_ATI_REMOTE2)         += ati_remote2.o
diff --git a/drivers/input/misc/ad714x-i2c.c b/drivers/input/misc/ad714x-i2c.c
new file mode 100644
index 000000000000..a2cb6b426dc7
--- /dev/null
+++ b/drivers/input/misc/ad714x-i2c.c
@@ -0,0 +1,137 @@
+/*
+ * AD714X CapTouch Programmable Controller driver (I2C bus)
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/input.h>        /* BUS_I2C */
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include "ad714x.h"
+
+#ifdef CONFIG_PM
+static int ad714x_i2c_suspend(struct i2c_client *client, pm_message_t message)
+{
+        return ad714x_disable(i2c_get_clientdata(client));
+}
+
+static int ad714x_i2c_resume(struct i2c_client *client)
+{
+        return ad714x_enable(i2c_get_clientdata(client));
+}
+#else
+# define ad714x_i2c_suspend NULL
+# define ad714x_i2c_resume  NULL
+#endif
+
+static int ad714x_i2c_write(struct device *dev, unsigned short reg,
+                                unsigned short data)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        int ret = 0;
+        u8 *_reg = (u8 *)&reg;
+        u8 *_data = (u8 *)&data;
+
+        u8 tx[4] = {
+                _reg[1],
+                _reg[0],
+                _data[1],
+                _data[0]
+        };
+
+        ret = i2c_master_send(client, tx, 4);
+        if (ret < 0)
+                dev_err(&client->dev, "I2C write error\n");
+
+        return ret;
+}
+
+static int ad714x_i2c_read(struct device *dev, unsigned short reg,
+                                unsigned short *data)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        int ret = 0;
+        u8 *_reg = (u8 *)&reg;
+        u8 *_data = (u8 *)data;
+
+        u8 tx[2] = {
+                _reg[1],
+                _reg[0]
+        };
+        u8 rx[2];
+
+        ret = i2c_master_send(client, tx, 2);
+        if (ret >= 0)
+                ret = i2c_master_recv(client, rx, 2);
+
+        if (unlikely(ret < 0)) {
+                dev_err(&client->dev, "I2C read error\n");
+        } else {
+                _data[0] = rx[1];
+                _data[1] = rx[0];
+        }
+
+        return ret;
+}
+
+static int __devinit ad714x_i2c_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        struct ad714x_chip *chip;
+
+        chip = ad714x_probe(&client->dev, BUS_I2C, client->irq,
+                            ad714x_i2c_read, ad714x_i2c_write);
+        if (IS_ERR(chip))
+                return PTR_ERR(chip);
+
+        i2c_set_clientdata(client, chip);
+
+        return 0;
+}
+
+static int __devexit ad714x_i2c_remove(struct i2c_client *client)
+{
+        struct ad714x_chip *chip = i2c_get_clientdata(client);
+
+        ad714x_remove(chip);
+        i2c_set_clientdata(client, NULL);
+
+        return 0;
+}
+
+static const struct i2c_device_id ad714x_id[] = {
+        { "ad7142_captouch", 0 },
+        { "ad7147_captouch", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, ad714x_id);
+
+static struct i2c_driver ad714x_i2c_driver = {
+        .driver = {
+                .name = "ad714x_captouch",
+        },
+        .probe    = ad714x_i2c_probe,
+        .remove   = __devexit_p(ad714x_i2c_remove),
+        .suspend  = ad714x_i2c_suspend,
+        .resume   = ad714x_i2c_resume,
+        .id_table = ad714x_id,
+};
+
+static __init int ad714x_i2c_init(void)
+{
+        return i2c_add_driver(&ad714x_i2c_driver);
+}
+module_init(ad714x_i2c_init);
+