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Commit 0eb5d5ab authored by Philipp Zabel's avatar Philipp Zabel Committed by Liam Girdwood
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regulator: TI bq24022 Li-Ion Charger driver 



This adds a regulator driver for the TI bq24022 Single-Chip
Li-Ion Charger with its nCE and ISET2 pins connected to GPIOs.

Signed-off-by: default avatarPhilipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: default avatarLiam Girdwood <lg@opensource.wolfsonmicro.com>
parent e53e86c7

drivers/regulator/Kconfig

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@@ -46,4 +46,14 @@ config REGULATOR_VIRTUAL_CONSUMER 


          If unsure, say no.



config REGULATOR_BQ24022

	tristate "TI bq24022 Dual Input 1-Cell Li-Ion Charger IC"

	default n

	select REGULATOR

	help

	  This driver controls a TI bq24022 Charger attached via

	  GPIOs. The provided current regulator can enable/disable

	  charging select between 100 mA and 500 mA charging current

	  limit.



endmenu

drivers/regulator/Makefile

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@@ -7,4 +7,6 @@ obj-$(CONFIG_REGULATOR) += core.o 
obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o

obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o



obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o



ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG

drivers/regulator/bq24022.c

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/*

 * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)

 * 1-Cell Li-Ion Charger connected via GPIOs.

 *

 * Copyright (c) 2008 Philipp Zabel

 *

 * 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.

 *

 */



#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/platform_device.h>

#include <linux/err.h>

#include <linux/gpio.h>

#include <linux/regulator/bq24022.h>

#include <linux/regulator/driver.h>



static int bq24022_set_current_limit(struct regulator_dev *rdev,

					int min_uA, int max_uA)

{

	struct platform_device *pdev = rdev_get_drvdata(rdev);

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;



	dev_dbg(&pdev->dev, "setting current limit to %s mA\n",

		max_uA >= 500000 ? "500" : "100");



	/* REVISIT: maybe return error if min_uA != 0 ? */

	gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);

	return 0;

}



static int bq24022_get_current_limit(struct regulator_dev *rdev)

{

	struct platform_device *pdev = rdev_get_drvdata(rdev);

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;



	return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;

}



static int bq24022_enable(struct regulator_dev *rdev)

{

	struct platform_device *pdev = rdev_get_drvdata(rdev);

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;



	dev_dbg(&pdev->dev, "enabling charger\n");



	gpio_set_value(pdata->gpio_nce, 0);

	return 0;

}



static int bq24022_disable(struct regulator_dev *rdev)

{

	struct platform_device *pdev = rdev_get_drvdata(rdev);

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;



	dev_dbg(&pdev->dev, "disabling charger\n");



	gpio_set_value(pdata->gpio_nce, 1);

	return 0;

}



static int bq24022_is_enabled(struct regulator_dev *rdev)

{

	struct platform_device *pdev = rdev_get_drvdata(rdev);

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;



	return !gpio_get_value(pdata->gpio_nce);

}



static struct regulator_ops bq24022_ops = {

	.set_current_limit = bq24022_set_current_limit,

	.get_current_limit = bq24022_get_current_limit,

	.enable            = bq24022_enable,

	.disable           = bq24022_disable,

	.is_enabled        = bq24022_is_enabled,

};



static struct regulator_desc bq24022_desc = {

	.name  = "bq24022",

	.ops   = &bq24022_ops,

	.type  = REGULATOR_CURRENT,

};



static int __init bq24022_probe(struct platform_device *pdev)

{

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;

	struct regulator_dev *bq24022;

	int ret;



	if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)

		return -EINVAL;



	ret = gpio_request(pdata->gpio_nce, "ncharge_en");

	if (ret) {

		dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",

			pdata->gpio_nce);

		goto err_ce;

	}

	ret = gpio_request(pdata->gpio_iset2, "charge_mode");

	if (ret) {

		dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",

			pdata->gpio_iset2);

		goto err_iset2;

	}

	ret = gpio_direction_output(pdata->gpio_iset2, 0);

	ret = gpio_direction_output(pdata->gpio_nce, 1);



	bq24022 = regulator_register(&bq24022_desc, pdev);

	if (IS_ERR(bq24022)) {

		dev_dbg(&pdev->dev, "couldn't register regulator\n");

		ret = PTR_ERR(bq24022);

		goto err_reg;

	}

	platform_set_drvdata(pdev, bq24022);

	dev_dbg(&pdev->dev, "registered regulator\n");



	return 0;

err_reg:

	gpio_free(pdata->gpio_iset2);

err_iset2:

	gpio_free(pdata->gpio_nce);

err_ce:

	return ret;

}



static int __devexit bq24022_remove(struct platform_device *pdev)

{

	struct bq24022_mach_info *pdata = pdev->dev.platform_data;

	struct regulator_dev *bq24022 = platform_get_drvdata(pdev);



	regulator_unregister(bq24022);

	gpio_free(pdata->gpio_iset2);

	gpio_free(pdata->gpio_nce);



	return 0;

}



static struct platform_driver bq24022_driver = {

	.driver = {

		.name = "bq24022",

	},

	.remove = __devexit_p(bq24022_remove),

};



static int __init bq24022_init(void)

{

	return platform_driver_probe(&bq24022_driver, bq24022_probe);

}



static void __exit bq24022_exit(void)

{

	platform_driver_unregister(&bq24022_driver);

}



/*

 * make sure this is probed before gpio_vbus and pda_power,

 * but after asic3 or other GPIO expander drivers.

 */

subsys_initcall(bq24022_init);

module_exit(bq24022_exit);



MODULE_AUTHOR("Philipp Zabel");

MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");

MODULE_LICENSE("GPL");

include/linux/regulator/bq24022.h

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/*

 * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)

 * 1-Cell Li-Ion Charger connected via GPIOs.

 *

 * Copyright (c) 2008 Philipp Zabel

 *

 * 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.

 *

 */



/**

 * bq24022_mach_info - platform data for bq24022

 * @gpio_nce: GPIO line connected to the nCE pin, used to enable / disable charging

 * @gpio_iset2: GPIO line connected to the ISET2 pin, used to limit charging current to 100 mA / 500 mA

 */

struct bq24022_mach_info {

	int gpio_nce;

	int gpio_iset2;

};