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Date: Mon, 05 Oct 2009 10:25:57 +0200
From: Éric Piel <eric.piel@...mplin-utc.net>
To: Samu Onkalo <samu.p.onkalo@...ia.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] LIS3LV02D: I2C support
Op 05-10-09 09:24, Samu Onkalo schreef:
> I2C bus support for lis3lv02d and variant accelerometer chips
>
> Signed-off-by: Samu Onkalo <samu.p.onkalo@...ia.com>
Acked-by: Éric Piel <eric.piel@...mplin-utc.net>
> ---
> drivers/hwmon/Kconfig | 17 ++++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/lis3lv02d_i2c.c | 184 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 202 insertions(+), 0 deletions(-)
> create mode 100644 drivers/hwmon/lis3lv02d_i2c.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 69222bc..f059dc1 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..51f858d
> --- /dev/null
> +++ b/drivers/hwmon/lis3lv02d_i2c.c
> @@ -0,0 +1,184 @@
> +/*
> + * 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@...aq.de> ).
> + *
> + * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
> + *
> + * Contact: Samu Onkalo <samu.p.onkalo@...ia.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, ®);
> + if (ret < 0)
> + return ret;
> +
> + reg |= CTRL1_PD0;
> + return lis3->write(lis3, CTRL_REG1, reg);
> +}
> +
> +/* Default axis mapping but it can be overwritten by platform data */
> +static struct axis_conversion lis3lv02d_axis_map = { LIS3_DEV_X,
> + LIS3_DEV_Y,
> + LIS3_DEV_Z };
> +
> +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;
> +
> + 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);
--
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