[mirror_ubuntu-bionic-kernel.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/module.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,
	.owner = THIS_MODULE,
};

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, NULL);
	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>
65602c32	17	#include <linux/module.h>
0eb5d5ab PZ	18	#include <linux/gpio.h>
	19	#include <linux/regulator/bq24022.h>
	20	#include <linux/regulator/driver.h>
	21
a5766f11	22
0eb5d5ab PZ	23	static int bq24022_set_current_limit(struct regulator_dev *rdev,
	24	int min_uA, int max_uA)
	25	{
a5766f11	26	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab	27
a5766f11	28	dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA\n",
0eb5d5ab PZ	29	max_uA >= 500000 ? "500" : "100");
	30
	31	/* REVISIT: maybe return error if min_uA != 0 ? */
	32	gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
	33	return 0;
	34	}
	35
	36	static int bq24022_get_current_limit(struct regulator_dev *rdev)
	37	{
a5766f11	38	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab PZ	39
	40	return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
	41	}
	42
	43	static int bq24022_enable(struct regulator_dev *rdev)
	44	{
a5766f11	45	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab	46
a5766f11	47	dev_dbg(rdev_get_dev(rdev), "enabling charger\n");
0eb5d5ab PZ	48
	49	gpio_set_value(pdata->gpio_nce, 0);
	50	return 0;
	51	}
	52
	53	static int bq24022_disable(struct regulator_dev *rdev)
	54	{
a5766f11	55	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab	56
a5766f11	57	dev_dbg(rdev_get_dev(rdev), "disabling charger\n");
0eb5d5ab PZ	58
	59	gpio_set_value(pdata->gpio_nce, 1);
	60	return 0;
	61	}
	62
	63	static int bq24022_is_enabled(struct regulator_dev *rdev)
	64	{
030853b7	65	struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
0eb5d5ab PZ	66
	67	return !gpio_get_value(pdata->gpio_nce);
	68	}
	69
	70	static struct regulator_ops bq24022_ops = {
	71	.set_current_limit = bq24022_set_current_limit,
	72	.get_current_limit = bq24022_get_current_limit,
	73	.enable = bq24022_enable,
	74	.disable = bq24022_disable,
	75	.is_enabled = bq24022_is_enabled,
	76	};
	77
	78	static struct regulator_desc bq24022_desc = {
	79	.name = "bq24022",
	80	.ops = &bq24022_ops,
	81	.type = REGULATOR_CURRENT,
64714354	82	.owner = THIS_MODULE,
0eb5d5ab PZ	83	};
	84
	85	static int __init bq24022_probe(struct platform_device *pdev)
	86	{
	87	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
	88	struct regulator_dev *bq24022;
	89	int ret;
	90
	91	if (!pdata \|\| !pdata->gpio_nce \|\| !pdata->gpio_iset2)
	92	return -EINVAL;
	93
	94	ret = gpio_request(pdata->gpio_nce, "ncharge_en");
	95	if (ret) {
	96	dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
	97	pdata->gpio_nce);
	98	goto err_ce;
	99	}
	100	ret = gpio_request(pdata->gpio_iset2, "charge_mode");
	101	if (ret) {
	102	dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
	103	pdata->gpio_iset2);
	104	goto err_iset2;
	105	}
	106	ret = gpio_direction_output(pdata->gpio_iset2, 0);
	107	ret = gpio_direction_output(pdata->gpio_nce, 1);
	108
93c62da2	109	bq24022 = regulator_register(&bq24022_desc, &pdev->dev,
2c043bcb	110	pdata->init_data, pdata, NULL);
0eb5d5ab PZ	111	if (IS_ERR(bq24022)) {
	112	dev_dbg(&pdev->dev, "couldn't register regulator\n");
	113	ret = PTR_ERR(bq24022);
	114	goto err_reg;
	115	}
	116	platform_set_drvdata(pdev, bq24022);
	117	dev_dbg(&pdev->dev, "registered regulator\n");
	118
	119	return 0;
	120	err_reg:
	121	gpio_free(pdata->gpio_iset2);
	122	err_iset2:
	123	gpio_free(pdata->gpio_nce);
	124	err_ce:
	125	return ret;
	126	}
	127
	128	static int __devexit bq24022_remove(struct platform_device *pdev)
	129	{
	130	struct bq24022_mach_info *pdata = pdev->dev.platform_data;
	131	struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
	132
	133	regulator_unregister(bq24022);
	134	gpio_free(pdata->gpio_iset2);
	135	gpio_free(pdata->gpio_nce);
	136
	137	return 0;
	138	}
	139
	140	static struct platform_driver bq24022_driver = {
	141	.driver = {
	142	.name = "bq24022",
	143	},
	144	.remove = __devexit_p(bq24022_remove),
	145	};
	146
	147	static int __init bq24022_init(void)
	148	{
	149	return platform_driver_probe(&bq24022_driver, bq24022_probe);
	150	}
	151
	152	static void __exit bq24022_exit(void)
	153	{
	154	platform_driver_unregister(&bq24022_driver);
	155	}
	156
9bf503e6	157	module_init(bq24022_init);
0eb5d5ab PZ	158	module_exit(bq24022_exit);
	159
	160	MODULE_AUTHOR("Philipp Zabel");
	161	MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
	162	MODULE_LICENSE("GPL");