Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 312ea07b authored by Samu Onkalo's avatar Samu Onkalo Committed by Linus Torvalds
Browse files

hwmon: I2C bus support for lis3lv02d and variant accelerometer chips 



Signed-off-by: default avatarSamu Onkalo <samu.p.onkalo@nokia.com>
Cc: Éric Piel <eric.piel@tremplin-utc.net>
Cc: Kalhan Trisal <kalhan.trisal@intel.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ec8e2f74

drivers/hwmon/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -998,6 +998,23 @@ 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

drivers/hwmon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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_LM73)	+= lm73.o

drivers/hwmon/lis3lv02d_i2c.c

0 → 100644
+183 −0
Original line number Diff line number Diff line 
/*

 * 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);

}



/* 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_init(lis3lv02d_init);

module_exit(lis3lv02d_exit);