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    Subject[PATCH 2/2] LIS3LV02D: I2C support
    Date
    I2C bus support for lis3lv02d and variant accelerometer chips

    Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
    ---
    drivers/hwmon/Kconfig | 17 ++++
    drivers/hwmon/Makefile | 1 +
    drivers/hwmon/lis3lv02d_i2c.c | 183 +++++++++++++++++++++++++++++++++++++++++
    3 files changed, 201 insertions(+), 0 deletions(-)
    create mode 100644 drivers/hwmon/lis3lv02d_i2c.c

    diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
    index 69222bc..3d8e1b7 100644
    --- a/drivers/hwmon/Kconfig
    +++ b/drivers/hwmon/Kconfig
    @@ -992,6 +992,23 @@ 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 also provides an absolute input class device, allowing
    + the device to act as a pinball machine-esque joystick.
    +
    + 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 4a34375..699e372 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 100644
    index 0000000..344b240
    --- /dev/null
    +++ b/drivers/hwmon/lis3lv02d_i2c.c
    @@ -0,0 +1,183 @@
    +/*
    + * drivers/hwmon/lis3lv02d_i2c.c
    + *
    + * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
    + * Driver is based on corresponding SPI driver written by Daniel Mack
    + * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
    + *
    + * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    + *
    + * Contact: Samu Onkalo <samu.p.onkalo@nokia.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 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.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program; if not, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
    + * 02110-1301 USA
    + */
    +
    +#include <linux/module.h>
    +#include <linux/kernel.h>
    +#include <linux/init.h>
    +#include <linux/err.h>
    +#include <linux/i2c.h>
    +#include "lis3lv02d.h"
    +
    +#define DRV_NAME "lis3lv02d_i2c"
    +
    +static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
    +{
    + struct i2c_client *c = lis3->bus_priv;
    + return i2c_smbus_write_byte_data(c, reg, value);
    +}
    +
    +static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
    +{
    + struct i2c_client *c = lis3->bus_priv;
    + *v = i2c_smbus_read_byte_data(c, reg);
    + return 0;
    +}
    +
    +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_map = { 1, 2, 3 };
    +
    +static int __devinit lis3lv02d_i2c_probe(struct i2c_client *client,
    + const struct i2c_device_id *id)
    +{
    + int ret = 0;
    + struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
    +
    + if (pdata) {
    + if (pdata->axis_x)
    + lis3lv02d_axis_map.x = pdata->axis_x;
    +
    + if (pdata->axis_y)
    + lis3lv02d_axis_map.y = pdata->axis_y;
    +
    + if (pdata->axis_z)
    + lis3lv02d_axis_map.z = pdata->axis_z;
    +
    + lis3_dev.irq2 = pdata->irq2;
    +
    + if (pdata->setup_resources)
    + ret = pdata->setup_resources();
    +
    + if (ret)
    + goto fail;
    + }
    +
    + lis3_dev.pdata = pdata;
    + 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_map;
    +
    + i2c_set_clientdata(client, &lis3_dev);
    + ret = lis3lv02d_init_device(&lis3_dev);
    +fail:
    + return ret;
    +}
    +
    +static int __devexit lis3lv02d_i2c_remove(struct i2c_client *client)
    +{
    + struct lis3lv02d *lis3 = i2c_get_clientdata(client);
    + struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
    +
    + if (pdata && pdata->release_resources)
    + pdata->release_resources();
    +
    + lis3lv02d_joystick_disable();
    + lis3lv02d_poweroff(lis3);
    +
    + return lis3lv02d_remove_fs(&lis3_dev);
    +}
    +
    +#ifdef CONFIG_PM
    +static int lis3lv02d_i2c_suspend(struct i2c_client *client, pm_message_t mesg)
    +{
    + struct lis3lv02d *lis3 = i2c_get_clientdata(client);
    +
    + if (!lis3->pdata->wakeup_flags)
    + lis3lv02d_poweroff(lis3);
    + return 0;
    +}
    +
    +static int lis3lv02d_i2c_resume(struct i2c_client *client)
    +{
    + struct lis3lv02d *lis3 = i2c_get_clientdata(client);
    +
    + if (!lis3->pdata->wakeup_flags)
    + lis3lv02d_poweron(lis3);
    + return 0;
    +}
    +
    +static void lis3lv02d_i2c_shutdown(struct i2c_client *client)
    +{
    + lis3lv02d_i2c_suspend(client, PMSG_SUSPEND);
    +}
    +#else
    +#define lis3lv02d_i2c_suspend NULL
    +#define lis3lv02d_i2c_resume NULL
    +#define lis3lv02d_i2c_shutdown NULL
    +#endif
    +
    +static const struct i2c_device_id lis3lv02d_id[] = {
    + {"lis3lv02d", 0 },
    + {}
    +};
    +
    +MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
    +
    +static struct i2c_driver lis3lv02d_i2c_driver = {
    + .driver = {
    + .name = DRV_NAME,
    + .owner = THIS_MODULE,
    + },
    + .suspend = lis3lv02d_i2c_suspend,
    + .shutdown = lis3lv02d_i2c_shutdown,
    + .resume = lis3lv02d_i2c_resume,
    + .probe = lis3lv02d_i2c_probe,
    + .remove = __devexit_p(lis3lv02d_i2c_remove),
    + .id_table = lis3lv02d_id,
    +};
    +
    +static int __init lis3lv02d_init(void)
    +{
    + return i2c_add_driver(&lis3lv02d_i2c_driver);
    +}
    +
    +static void __exit lis3lv02d_exit(void)
    +{
    + i2c_del_driver(&lis3lv02d_i2c_driver);
    +}
    +
    +MODULE_AUTHOR("Nokia Corporation");
    +MODULE_DESCRIPTION("lis3lv02d I2C interface");
    +MODULE_LICENSE("GPL");
    +MODULE_ALIAS("i2c:" DRV_NAME);
    +
    +module_init(lis3lv02d_init);
    +module_exit(lis3lv02d_exit);
    --
    1.5.6.3


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