0eb5d5ab3e
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>
168 lines
4.2 KiB
C
168 lines
4.2 KiB
C
/*
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* Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
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* 1-Cell Li-Ion Charger connected via GPIOs.
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*
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* Copyright (c) 2008 Philipp Zabel
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/regulator/bq24022.h>
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#include <linux/regulator/driver.h>
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static int bq24022_set_current_limit(struct regulator_dev *rdev,
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int min_uA, int max_uA)
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{
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struct platform_device *pdev = rdev_get_drvdata(rdev);
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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dev_dbg(&pdev->dev, "setting current limit to %s mA\n",
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max_uA >= 500000 ? "500" : "100");
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/* REVISIT: maybe return error if min_uA != 0 ? */
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gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
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return 0;
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}
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static int bq24022_get_current_limit(struct regulator_dev *rdev)
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{
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struct platform_device *pdev = rdev_get_drvdata(rdev);
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
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}
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static int bq24022_enable(struct regulator_dev *rdev)
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{
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struct platform_device *pdev = rdev_get_drvdata(rdev);
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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dev_dbg(&pdev->dev, "enabling charger\n");
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gpio_set_value(pdata->gpio_nce, 0);
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return 0;
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}
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static int bq24022_disable(struct regulator_dev *rdev)
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{
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struct platform_device *pdev = rdev_get_drvdata(rdev);
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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dev_dbg(&pdev->dev, "disabling charger\n");
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gpio_set_value(pdata->gpio_nce, 1);
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return 0;
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}
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static int bq24022_is_enabled(struct regulator_dev *rdev)
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{
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struct platform_device *pdev = rdev_get_drvdata(rdev);
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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return !gpio_get_value(pdata->gpio_nce);
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}
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static struct regulator_ops bq24022_ops = {
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.set_current_limit = bq24022_set_current_limit,
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.get_current_limit = bq24022_get_current_limit,
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.enable = bq24022_enable,
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.disable = bq24022_disable,
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.is_enabled = bq24022_is_enabled,
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};
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static struct regulator_desc bq24022_desc = {
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.name = "bq24022",
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.ops = &bq24022_ops,
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.type = REGULATOR_CURRENT,
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};
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static int __init bq24022_probe(struct platform_device *pdev)
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{
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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struct regulator_dev *bq24022;
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int ret;
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if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)
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return -EINVAL;
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ret = gpio_request(pdata->gpio_nce, "ncharge_en");
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if (ret) {
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dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
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pdata->gpio_nce);
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goto err_ce;
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}
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ret = gpio_request(pdata->gpio_iset2, "charge_mode");
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if (ret) {
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dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
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pdata->gpio_iset2);
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goto err_iset2;
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}
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ret = gpio_direction_output(pdata->gpio_iset2, 0);
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ret = gpio_direction_output(pdata->gpio_nce, 1);
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bq24022 = regulator_register(&bq24022_desc, pdev);
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if (IS_ERR(bq24022)) {
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dev_dbg(&pdev->dev, "couldn't register regulator\n");
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ret = PTR_ERR(bq24022);
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goto err_reg;
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}
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platform_set_drvdata(pdev, bq24022);
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dev_dbg(&pdev->dev, "registered regulator\n");
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return 0;
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err_reg:
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gpio_free(pdata->gpio_iset2);
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err_iset2:
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gpio_free(pdata->gpio_nce);
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err_ce:
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return ret;
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}
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static int __devexit bq24022_remove(struct platform_device *pdev)
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{
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struct bq24022_mach_info *pdata = pdev->dev.platform_data;
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struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
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regulator_unregister(bq24022);
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gpio_free(pdata->gpio_iset2);
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gpio_free(pdata->gpio_nce);
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return 0;
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}
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static struct platform_driver bq24022_driver = {
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.driver = {
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.name = "bq24022",
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},
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.remove = __devexit_p(bq24022_remove),
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};
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static int __init bq24022_init(void)
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{
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return platform_driver_probe(&bq24022_driver, bq24022_probe);
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}
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static void __exit bq24022_exit(void)
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{
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platform_driver_unregister(&bq24022_driver);
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}
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/*
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* make sure this is probed before gpio_vbus and pda_power,
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* but after asic3 or other GPIO expander drivers.
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*/
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subsys_initcall(bq24022_init);
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module_exit(bq24022_exit);
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MODULE_AUTHOR("Philipp Zabel");
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MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
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MODULE_LICENSE("GPL");
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