[net-next-2.6.git] / drivers / regulator / bq24022.c

/*
 * 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 bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

	dev_dbg(rdev_get_dev(rdev), "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 bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

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

static int bq24022_enable(struct regulator_dev *rdev)
{
	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

	dev_dbg(rdev_get_dev(rdev), "enabling charger\n");

	gpio_set_value(pdata->gpio_nce, 0);
	return 0;
}

static int bq24022_disable(struct regulator_dev *rdev)
{
	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

	dev_dbg(rdev_get_dev(rdev), "disabling charger\n");

	gpio_set_value(pdata->gpio_nce, 1);
	return 0;
}

static int bq24022_is_enabled(struct regulator_dev *rdev)
{
	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);

	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->dev,
				     pdata->init_data, pdata);
	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);
}

module_init(bq24022_init);
module_exit(bq24022_exit);

MODULE_AUTHOR("Philipp Zabel");
MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
0eb5d5ab PZ	1	/*
	2	* Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
	3	* 1-Cell Li-Ion Charger connected via GPIOs.
	4	*
	5	* Copyright (c) 2008 Philipp Zabel
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/init.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/err.h>
	17	#include <linux/gpio.h>
	18	#include <linux/regulator/bq24022.h>
	19	#include <linux/regulator/driver.h>
	20
a5766f11	21
0eb5d5ab PZ	22	static int bq24022_set_current_limit(struct regulator_dev *rdev,
	23	int min_uA, int max_uA)
	24	{
a5766f11	25	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab	26
a5766f11	27	dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA\n",
0eb5d5ab PZ	28	max_uA >= 500000 ? "500" : "100");
	29
	30	/* REVISIT: maybe return error if min_uA != 0 ? */
	31	gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
	32	return 0;
	33	}
	34
	35	static int bq24022_get_current_limit(struct regulator_dev *rdev)
	36	{
a5766f11	37	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab PZ	38
	39	return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
	40	}
	41
	42	static int bq24022_enable(struct regulator_dev *rdev)
	43	{
a5766f11	44	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab	45
a5766f11	46	dev_dbg(rdev_get_dev(rdev), "enabling charger\n");
0eb5d5ab PZ	47
	48	gpio_set_value(pdata->gpio_nce, 0);
	49	return 0;
	50	}
	51
	52	static int bq24022_disable(struct regulator_dev *rdev)
	53	{
a5766f11	54	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab	55
a5766f11	56	dev_dbg(rdev_get_dev(rdev), "disabling charger\n");
0eb5d5ab PZ	57
	58	gpio_set_value(pdata->gpio_nce, 1);
	59	return 0;
	60	}
	61
	62	static int bq24022_is_enabled(struct regulator_dev *rdev)
	63	{
030853b7	64	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab PZ	65
	66	return !gpio_get_value(pdata->gpio_nce);
	67	}
	68
	69	static struct regulator_ops bq24022_ops = {
	70	.set_current_limit = bq24022_set_current_limit,
	71	.get_current_limit = bq24022_get_current_limit,
	72	.enable = bq24022_enable,
	73	.disable = bq24022_disable,
	74	.is_enabled = bq24022_is_enabled,
	75	};
	76
	77	static struct regulator_desc bq24022_desc = {
	78	.name = "bq24022",
	79	.ops = &bq24022_ops,
	80	.type = REGULATOR_CURRENT,
	81	};
	82
	83	static int __init bq24022_probe(struct platform_device *pdev)
	84	{
	85	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
	86	struct regulator_dev *bq24022;
	87	int ret;
	88
	89	if (!pdata \|\| !pdata->gpio_nce \|\| !pdata->gpio_iset2)
	90	return -EINVAL;
	91
	92	ret = gpio_request(pdata->gpio_nce, "ncharge_en");
	93	if (ret) {
	94	dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
	95	pdata->gpio_nce);
	96	goto err_ce;
	97	}
	98	ret = gpio_request(pdata->gpio_iset2, "charge_mode");
	99	if (ret) {
	100	dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
	101	pdata->gpio_iset2);
	102	goto err_iset2;
	103	}
	104	ret = gpio_direction_output(pdata->gpio_iset2, 0);
	105	ret = gpio_direction_output(pdata->gpio_nce, 1);
	106
93c62da2 MB	107	bq24022 = regulator_register(&bq24022_desc, &pdev->dev,
93c62da2 MB	108	pdata->init_data, pdata);
0eb5d5ab PZ	109	if (IS_ERR(bq24022)) {
	110	dev_dbg(&pdev->dev, "couldn't register regulator\n");
	111	ret = PTR_ERR(bq24022);
	112	goto err_reg;
	113	}
	114	platform_set_drvdata(pdev, bq24022);
	115	dev_dbg(&pdev->dev, "registered regulator\n");
	116
	117	return 0;
	118	err_reg:
	119	gpio_free(pdata->gpio_iset2);
	120	err_iset2:
	121	gpio_free(pdata->gpio_nce);
	122	err_ce:
	123	return ret;
	124	}
	125
	126	static int __devexit bq24022_remove(struct platform_device *pdev)
	127	{
	128	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
	129	struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
	130
	131	regulator_unregister(bq24022);
	132	gpio_free(pdata->gpio_iset2);
	133	gpio_free(pdata->gpio_nce);
	134
	135	return 0;
	136	}
	137
	138	static struct platform_driver bq24022_driver = {
	139	.driver = {
	140	.name = "bq24022",
	141	},
	142	.remove = __devexit_p(bq24022_remove),
	143	};
	144
	145	static int __init bq24022_init(void)
	146	{
	147	return platform_driver_probe(&bq24022_driver, bq24022_probe);
	148	}
	149
	150	static void __exit bq24022_exit(void)
	151	{
	152	platform_driver_unregister(&bq24022_driver);
	153	}
	154
9bf503e6	155	module_init(bq24022_init);
0eb5d5ab PZ	156	module_exit(bq24022_exit);
	157
	158	MODULE_AUTHOR("Philipp Zabel");
	159	MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
	160	MODULE_LICENSE("GPL");