/* * 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");