Commit 7fb7ba58 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen
Browse files

bq27x00: Add bq27000 support 



This patch adds support for the bq27000 battery to the bq27x00 driver.
The bq27000 is similar to the bq27200 except that it uses the HDQ bus
instead of I2C to communicate with the host system.

The driver is implemented as a platform driver. The driver expects to be
provided with a read callback function through its platform data. The read
function is assumed to do the lowlevel HDQ handling and read out the value
of a certain register.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Tested-by: default avatarGrazvydas Ignotas <notasas@gmail.com>
parent a40402ef

drivers/power/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -117,10 +117,24 @@ config BATTERY_BQ20Z75 


config BATTERY_BQ27x00

	tristate "BQ27x00 battery driver"

	help

	  Say Y here to enable support for batteries with BQ27x00 (I2C/HDQ) chips.



config BATTERY_BQ27X00_I2C

	bool "BQ27200/BQ27500 support"

	depends on BATTERY_BQ27x00

	depends on I2C

	default y

	help

	  Say Y here to enable support for batteries with BQ27x00 (I2C) chips.



config BATTERY_BQ27X00_PLATFORM

	bool "BQ27000 support"

	depends on BATTERY_BQ27x00

	default y

	help

	  Say Y here to enable support for batteries with BQ27000 (HDQ) chips.



config BATTERY_DA9030

	tristate "DA9030 battery driver"

	depends on PMIC_DA903X

drivers/power/bq27x00_battery.c

+169 −15
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 *

 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>

 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>

 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>

 *

 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.

 *
@@ -27,6 +28,8 @@ 
#include <linux/slab.h>

#include <asm/unaligned.h>



#include <linux/power/bq27x00_battery.h>



#define DRIVER_VERSION			"1.1.0"



#define BQ27x00_REG_TEMP		0x06
@@ -46,12 +49,6 @@ 


#define BQ27000_RS			20 /* Resistor sense */



/* If the system has several batteries we need a different name for each

 * of them...

 */

static DEFINE_IDR(battery_id);

static DEFINE_MUTEX(battery_mutex);



struct bq27x00_device_info;

struct bq27x00_access_methods {

	int (*read)(struct bq27x00_device_info *, u8 reg, int *rt_value,
@@ -317,9 +314,15 @@ static int bq27x00_powersupply_init(struct bq27x00_device_info *di) 
	return 0;

}



/*

 * i2c specific code



/* i2c specific code */

#ifdef CONFIG_BATTERY_BQ27X00_I2C



/* If the system has several batteries we need a different name for each

 * of them...

 */

static DEFINE_IDR(battery_id);

static DEFINE_MUTEX(battery_mutex);



static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg,

			int *rt_value, bool single)
@@ -434,10 +437,6 @@ static int bq27x00_battery_remove(struct i2c_client *client) 
	return 0;

}



/*

 * Module stuff

 */



static const struct i2c_device_id bq27x00_id[] = {

	{ "bq27200", BQ27000 },	/* bq27200 is same as bq27000, but with i2c */

	{ "bq27500", BQ27500 },
@@ -453,13 +452,167 @@ static struct i2c_driver bq27x00_battery_driver = { 
	.id_table = bq27x00_id,

};



static inline int bq27x00_battery_i2c_init(void)

{

	int ret = i2c_add_driver(&bq27x00_battery_driver);

	if (ret)

		printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");



	return ret;

}



static inline void bq27x00_battery_i2c_exit(void)

{

	i2c_del_driver(&bq27x00_battery_driver);

}



#else



static inline int bq27x00_battery_i2c_init(void) { return 0; }

static inline void bq27x00_battery_i2c_exit(void) {};



#endif



/* platform specific code */

#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM



static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,

			int *rt_value, bool single)

{

	struct device *dev = di->dev;

	struct bq27000_platform_data *pdata = dev->platform_data;

	unsigned int timeout = 3;

	int upper, lower;

	int temp;



	if (!single) {

		/* Make sure the value has not changed in between reading the

		 * lower and the upper part */

		upper = pdata->read(dev, reg + 1);

		do {

			temp = upper;

			if (upper < 0)

				return upper;



			lower = pdata->read(dev, reg);

			if (lower < 0)

				return lower;



			upper = pdata->read(dev, reg + 1);

		} while (temp != upper && --timeout);



		if (timeout == 0)

			return -EIO;



		*rt_value = (upper << 8) | lower;

	} else {

		lower = pdata->read(dev, reg);

		if (lower < 0)

			return lower;

		*rt_value = lower;

	}

	return 0;

}



static int __devinit bq27000_battery_probe(struct platform_device *pdev)

{

	struct bq27x00_device_info *di;

	struct bq27000_platform_data *pdata = pdev->dev.platform_data;

	int ret;



	if (!pdata) {

		dev_err(&pdev->dev, "no platform_data supplied\n");

		return -EINVAL;

	}



	if (!pdata->read) {

		dev_err(&pdev->dev, "no hdq read callback supplied\n");

		return -EINVAL;

	}



	di = kzalloc(sizeof(*di), GFP_KERNEL);

	if (!di) {

		dev_err(&pdev->dev, "failed to allocate device info data\n");

		return -ENOMEM;

	}



	platform_set_drvdata(pdev, di);



	di->dev = &pdev->dev;

	di->chip = BQ27000;



	di->bat.name = pdata->name ?: dev_name(&pdev->dev);

	di->bus.read = &bq27000_read_platform;



	ret = bq27x00_powersupply_init(di);

	if (ret)

		goto err_free;



	return 0;



err_free:

	platform_set_drvdata(pdev, NULL);

	kfree(di);



	return ret;

}



static int __devexit bq27000_battery_remove(struct platform_device *pdev)

{

	struct bq27x00_device_info *di = platform_get_drvdata(pdev);



	power_supply_unregister(&di->bat);

	platform_set_drvdata(pdev, NULL);

	kfree(di);



	return 0;

}



static struct platform_driver bq27000_battery_driver = {

	.probe	= bq27000_battery_probe,

	.remove = __devexit_p(bq27000_battery_remove),

	.driver = {

		.name = "bq27000-battery",

		.owner = THIS_MODULE,

	},

};



static inline int bq27x00_battery_platform_init(void)

{

	int ret = platform_driver_register(&bq27000_battery_driver);

	if (ret)

		printk(KERN_ERR "Unable to register BQ27000 platform driver\n");



	return ret;

}



static inline void bq27x00_battery_platform_exit(void)

{

	platform_driver_unregister(&bq27000_battery_driver);

}



#else



static inline int bq27x00_battery_platform_init(void) { return 0; }

static inline void bq27x00_battery_platform_exit(void) {};



#endif



/*

 * Module stuff

 */



static int __init bq27x00_battery_init(void)

{

	int ret;



	ret = i2c_add_driver(&bq27x00_battery_driver);

	ret = bq27x00_battery_i2c_init();

	if (ret)

		return ret;



	ret = bq27x00_battery_platform_init();

	if (ret)

		printk(KERN_ERR "Unable to register BQ27x00 driver\n");

		bq27x00_battery_i2c_exit();



	return ret;

}
@@ -467,7 +620,8 @@ module_init(bq27x00_battery_init); 


static void __exit bq27x00_battery_exit(void)

{

	i2c_del_driver(&bq27x00_battery_driver);

	bq27x00_battery_platform_exit();

	bq27x00_battery_i2c_exit();

}

module_exit(bq27x00_battery_exit);

include/linux/power/bq27x00_battery.h

0 → 100644
+19 −0
Original line number Diff line number Diff line 
#ifndef __LINUX_BQ27X00_BATTERY_H__

#define __LINUX_BQ27X00_BATTERY_H__



/**

 * struct bq27000_plaform_data - Platform data for bq27000 devices

 * @name: Name of the battery. If NULL the driver will fallback to "bq27000".

 * @read: HDQ read callback.

 *	This function should provide access to the HDQ bus the battery is

 *	connected to.

 *	The first parameter is a pointer to the battery device, the second the

 *	register to be read. The return value should either be the content of

 *	the passed register or an error value.

 */

struct bq27000_platform_data {

	const char *name;

	int (*read)(struct device *dev, unsigned int);

};



#endif

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