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: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
This commit is contained in:
Philipp Zabel
Liam Girdwood
parent
e53e86c7ae
commit
0eb5d5ab3e
@ -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
|
||||
|
||||
@ -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
|
||||
|
||||
167
drivers/regulator/bq24022.c
Normal file
167
drivers/regulator/bq24022.c
Normal file
@ -0,0 +1,167 @@
|
||||
/*
|
||||
* 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");
|
||||
21
include/linux/regulator/bq24022.h
Normal file
21
include/linux/regulator/bq24022.h
Normal file
@ -0,0 +1,21 @@
|
||||
/*
|
||||
* 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;
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user