Input: add driver for ADXL345/346 Digital Accelerometers

This is a driver for the ADXL345/346 Three-Axis Digital Accelerometers.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Chris Verges <chrisv@cyberswitching.com>
Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/input/misc/adxl34x-i2c.c b/drivers/input/misc/adxl34x-i2c.c
new file mode 100644
index 00000000000..76194b58bd0
--- /dev/null
+++ b/drivers/input/misc/adxl34x-i2c.c
@@ -0,0 +1,163 @@
+/*
+ * ADLX345/346 Three-Axis Digital Accelerometers (I2C Interface)
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Copyright (C) 2009 Michael Hennerich, 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 "adxl34x.h"
+
+static int adxl34x_smbus_read(struct device *dev, unsigned char reg)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int adxl34x_smbus_write(struct device *dev,
+			       unsigned char reg, unsigned char val)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return i2c_smbus_write_byte_data(client, reg, val);
+}
+
+static int adxl34x_smbus_read_block(struct device *dev,
+				    unsigned char reg, int count,
+				    void *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return i2c_smbus_read_i2c_block_data(client, reg, count, buf);
+}
+
+static int adxl34x_i2c_read_block(struct device *dev,
+				  unsigned char reg, int count,
+				  void *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	int ret;
+
+	ret = i2c_master_send(client, &reg, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_master_recv(client, buf, count);
+	if (ret < 0)
+		return ret;
+
+	if (ret != count)
+		return -EIO;
+
+	return 0;
+}
+
+static const struct adxl34x_bus_ops adx134x_smbus_bops = {
+	.bustype	= BUS_I2C,
+	.write		= adxl34x_smbus_write,
+	.read		= adxl34x_smbus_read,
+	.read_block	= adxl34x_smbus_read_block,
+};
+
+static const struct adxl34x_bus_ops adx134x_i2c_bops = {
+	.bustype	= BUS_I2C,
+	.write		= adxl34x_smbus_write,
+	.read		= adxl34x_smbus_read,
+	.read_block	= adxl34x_i2c_read_block,
+};
+
+static int __devinit adxl34x_i2c_probe(struct i2c_client *client,
+				       const struct i2c_device_id *id)
+{
+	struct adxl34x *ac;
+	int error;
+
+	error = i2c_check_functionality(client->adapter,
+			I2C_FUNC_SMBUS_BYTE_DATA);
+	if (!error) {
+		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
+		return -EIO;
+	}
+
+	ac = adxl34x_probe(&client->dev, client->irq, false,
+			   i2c_check_functionality(client->adapter,
+						   I2C_FUNC_SMBUS_READ_I2C_BLOCK) ?
+				&adx134x_smbus_bops : &adx134x_i2c_bops);
+	if (IS_ERR(ac))
+		return PTR_ERR(ac);
+
+	i2c_set_clientdata(client, ac);
+
+	return 0;
+}
+
+static int __devexit adxl34x_i2c_remove(struct i2c_client *client)
+{
+	struct adxl34x *ac = i2c_get_clientdata(client);
+
+	return adxl34x_remove(ac);
+}
+
+#ifdef CONFIG_PM
+static int adxl34x_suspend(struct i2c_client *client, pm_message_t message)
+{
+	struct adxl34x *ac = i2c_get_clientdata(client);
+
+	adxl34x_disable(ac);
+
+	return 0;
+}
+
+static int adxl34x_resume(struct i2c_client *client)
+{
+	struct adxl34x *ac = i2c_get_clientdata(client);
+
+	adxl34x_enable(ac);
+
+	return 0;
+}
+#else
+# define adxl34x_suspend NULL
+# define adxl34x_resume  NULL
+#endif
+
+static const struct i2c_device_id adxl34x_id[] = {
+	{ "adxl34x", 0 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, adxl34x_id);
+
+static struct i2c_driver adxl34x_driver = {
+	.driver = {
+		.name = "adxl34x",
+		.owner = THIS_MODULE,
+	},
+	.probe    = adxl34x_i2c_probe,
+	.remove   = __devexit_p(adxl34x_i2c_remove),
+	.suspend  = adxl34x_suspend,
+	.resume   = adxl34x_resume,
+	.id_table = adxl34x_id,
+};
+
+static int __init adxl34x_i2c_init(void)
+{
+	return i2c_add_driver(&adxl34x_driver);
+}
+module_init(adxl34x_i2c_init);
+
+static void __exit adxl34x_i2c_exit(void)
+{
+	i2c_del_driver(&adxl34x_driver);
+}
+module_exit(adxl34x_i2c_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer I2C Bus Driver");
+MODULE_LICENSE("GPL");