[lm-sensors] I2C support STMicroeletronics LIS302Dx three-axis digital accelerometer

[Jonathan Cameron]

Acked-by: Jonathan Cameron <jic23 at cam.ac.uk>
> From 49fc14f67760c6f5ba0d3f33538af948f87c7b66 Mon Sep 17 00:00:00 2001
> From: Kalhan Trisal <kalhan.trisal at intel.com>
> Date: Mon, 5 Oct 2009 18:22:33 -0400
> Subject: [PATCH] I2C glue layer for lis3lv02d STMicroelectronics digital accelerometer
> This patch will support I2C interface for ST Macroelectronics 3 axis digital accelerometer.
> 
> Signed-off-by: Kalhan Trisal <kalhan.trisal at intel.com>
> ---
>  drivers/hwmon/Kconfig         |   14 ++++++
>  drivers/hwmon/Makefile        |    1 +
>  drivers/hwmon/lis3lv02d_i2c.c |  103 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 118 insertions(+), 0 deletions(-)
>  create mode 100755 drivers/hwmon/lis3lv02d_i2c.c
> 
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 6857560..c5e2760 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -983,6 +983,20 @@ config SENSORS_LIS3_SPI
>  	  will be called lis3lv02d and a specific module for the SPI transport
>  	  is called lis3lv02d_spi.
>  
> +config SENSORS_LIS3_I2C
> +	tristate "STMicroeletronics LIS3LV02Dx three-axis digital accelerometer (I2C)"
> +	depends on I2C && INPUT
> +	select INPUT_POLLDEV
> +	default n
> +	help
> +	  This driver provides support for the LIS3LV02Dx accelerometer connected
> +	  via I2C. The accelerometer data is readable via
> +	  /sys/devices/platform/lis3lv02d.
> +
> +	  This driver can also be built as modules.  If so, the core module
> +	  will be called lis3lv02d and a specific module for the I2C transport
> +	  is called lis3lv02d_i2c.
> +
>  config SENSORS_APPLESMC
>  	tristate "Apple SMC (Motion sensor, light sensor, keyboard backlight)"
>  	depends on INPUT && X86
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 9f46cb0..cc2c12d 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -55,6 +55,7 @@ obj-$(CONFIG_SENSORS_IT87)	+= it87.o
>  obj-$(CONFIG_SENSORS_K8TEMP)	+= k8temp.o
>  obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
>  obj-$(CONFIG_SENSORS_LIS3_SPI)	+= lis3lv02d.o lis3lv02d_spi.o
> +obj-$(CONFIG_SENSORS_LIS3_I2C)	+= lis3lv02d.o lis3lv02d_i2c.o
>  obj-$(CONFIG_SENSORS_LM63)	+= lm63.o
>  obj-$(CONFIG_SENSORS_LM70)	+= lm70.o
>  obj-$(CONFIG_SENSORS_LM75)	+= lm75.o
> diff --git a/drivers/hwmon/lis3lv02d_i2c.c b/drivers/hwmon/lis3lv02d_i2c.c
> new file mode 100755
> index 0000000..0be5cd0
> --- /dev/null
> +++ b/drivers/hwmon/lis3lv02d_i2c.c
> @@ -0,0 +1,103 @@
> +/*
> + * lis3lv02d_i2c - I2C glue layer for LIS[32]02DL varients
> + *
> + * Copyright (c) 2009  Kalhan Trisal <kalhan.trisal at intel.com>
> + *
> + *  This program is free software; you can redistribute it and/or modify
> + *  it under the terms of the GNU General Public License version 2 as
> + *  publishhed by the Free Software Foundation.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/i2c.h>
> +#include "lis3lv02d.h"
> +
> +
> +static int lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
> +{
> +	int ret;
> +	ret = i2c_smbus_read_byte_data(lis3->bus_priv, reg);
> +
> +	*v = (u8) ret;
> +	return ret;
> +}
> +
> +static int lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 val)
> +{
> +
> +	return  i2c_smbus_write_byte_data(lis3->bus_priv, reg, val);
> +}
> +
> +static int lis3_i2c_init(struct lis3lv02d *lis3)
> +{
> +	u8 reg;
> +	int ret;
> +
> +	/* power up the device */
> +	ret = lis3->read(lis3, CTRL_REG1, &reg);
> +	if (ret < 0)
> +		return ret;
> +
> +	reg |= CTRL1_PD0;
> +	return lis3->write(lis3, CTRL_REG1, reg);
> +}
> +
> +static struct axis_conversion lis3lv02d_axis_normal = { 1, 2, 3 };
> +
> +static int  lis302dl_probe(struct i2c_client *client,
> +				const struct i2c_device_id *id)
> +{
> +	lis3_dev.bus_priv = client;
> +	lis3_dev.init = lis3_i2c_init;
> +	lis3_dev.read = lis3_i2c_read;
> +	lis3_dev.write = lis3_i2c_write;
> +	lis3_dev.irq = client->irq;
> +	lis3_dev.ac = lis3lv02d_axis_normal;
> +	lis3_dev.pdata = client->dev.platform_data;
> +	i2c_set_clientdata(client, &lis3_dev);
> +	return lis3lv02d_init_device(&lis3_dev);
> +}
> +
> +static int lis302dl_remove(struct i2c_client *client)
> +{
> +	struct lis3lv02d *lis3 = i2c_get_clientdata(client);
> +	lis3lv02d_joystick_disable();
> +	lis3lv02d_poweroff(lis3);
> +	return 0;
> +}
> +
> +static struct i2c_device_id lis302dl_id[] = {
> +	{ "lis302dl", 0 },
> +	{ }
> +};
> +
> +MODULE_DEVICE_TABLE(i2c, lis302dl_id);
> +
> +static struct i2c_driver lis302dl_driver = {
> +	.driver = {
> +	.name = "lis302dl_i2c",
> +	},
> +	.probe = lis302dl_probe,
> +	.remove = lis302dl_remove,
> +	.id_table = lis302dl_id,
> +};
> +
> +static int __init sensor_lis302dl_init(void)
> +{
> +	return  i2c_add_driver(&lis302dl_driver);
> +}
> +
> +static void  __exit sensor_lis302dl_exit(void)
> +{
> +	i2c_del_driver(&lis302dl_driver);
> +}
> +
> +module_init(sensor_lis302dl_init);
> +module_exit(sensor_lis302dl_exit);
> +
> +MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal at intel.com>");
> +MODULE_DESCRIPTION("LIS[32]02DL I2C glue layer");
> +MODULE_LICENSE("GPL");
> +