1 files changed, 137 insertions, 0 deletions

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);
+
+static __exit void ad714x_i2c_exit(void)
+{
+        i2c_del_driver(&ad714x_i2c_driver);
+}
+module_exit(ad714x_i2c_exit);
+
+MODULE_DESCRIPTION("Analog Devices AD714X Capacitance Touch Sensor I2C Bus Driver");
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_LICENSE("GPL");