mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
9bf503e6be
This workaround was needed when regulator/ was not linked before both power/ and usb/otg/ in drivers/Makefile. Now that it is even linked before mfd/, this patch makes sure that bq24022 isn't probed before the GPIO expander is set up. Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
160 lines
3.9 KiB
C
160 lines
3.9 KiB
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 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);
|
|
}
|
|
|
|
module_init(bq24022_init);
|
|
module_exit(bq24022_exit);
|
|
|
|
MODULE_AUTHOR("Philipp Zabel");
|
|
MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
|
|
MODULE_LICENSE("GPL");
|