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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 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 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->dev, 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);
}
/*
* 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");
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