LXR linux/drivers/regulator/bq24022.c

   1/*
   2 * Support for TI bq24022 (bqTINY-II) Dual Input (USB/AC Adpater)
   3 * 1-Cell Li-Ion Charger connected via GPIOs.
   4 *
   5 * Copyright (c) 2008 Philipp Zabel
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 *
  11 */
  12
  13#include <linux/kernel.h>
  14#include <linux/init.h>
  15#include <linux/platform_device.h>
  16#include <linux/err.h>
  17#include <linux/module.h>
  18#include <linux/gpio.h>
  19#include <linux/regulator/bq24022.h>
  20#include <linux/regulator/driver.h>
  21
  22
  23static int bq24022_set_current_limit(struct regulator_dev *rdev,
  24                                        int min_uA, int max_uA)
  25{
  26        struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
  27
  28        dev_dbg(rdev_get_dev(rdev), "setting current limit to %s mA\n",
  29                max_uA >= 500000 ? "500" : "100");
  30
  31        /* REVISIT: maybe return error if min_uA != 0 ? */
  32        gpio_set_value(pdata->gpio_iset2, max_uA >= 500000);
  33        return 0;
  34}
  35
  36static int bq24022_get_current_limit(struct regulator_dev *rdev)
  37{
  38        struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
  39
  40        return gpio_get_value(pdata->gpio_iset2) ? 500000 : 100000;
  41}
  42
  43static int bq24022_enable(struct regulator_dev *rdev)
  44{
  45        struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
  46
  47        dev_dbg(rdev_get_dev(rdev), "enabling charger\n");
  48
  49        gpio_set_value(pdata->gpio_nce, 0);
  50        return 0;
  51}
  52
  53static int bq24022_disable(struct regulator_dev *rdev)
  54{
  55        struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
  56
  57        dev_dbg(rdev_get_dev(rdev), "disabling charger\n");
  58
  59        gpio_set_value(pdata->gpio_nce, 1);
  60        return 0;
  61}
  62
  63static int bq24022_is_enabled(struct regulator_dev *rdev)
  64{
  65        struct bq24022_mach_info *pdata = rdev_get_drvdata(rdev);
  66
  67        return !gpio_get_value(pdata->gpio_nce);
  68}
  69
  70static struct regulator_ops bq24022_ops = {
  71        .set_current_limit = bq24022_set_current_limit,
  72        .get_current_limit = bq24022_get_current_limit,
  73        .enable            = bq24022_enable,
  74        .disable           = bq24022_disable,
  75        .is_enabled        = bq24022_is_enabled,
  76};
  77
  78static struct regulator_desc bq24022_desc = {
  79        .name  = "bq24022",
  80        .ops   = &bq24022_ops,
  81        .type  = REGULATOR_CURRENT,
  82        .owner = THIS_MODULE,
  83};
  84
  85static int __init bq24022_probe(struct platform_device *pdev)
  86{
  87        struct bq24022_mach_info *pdata = pdev->dev.platform_data;
  88        struct regulator_dev *bq24022;
  89        int ret;
  90
  91        if (!pdata || !pdata->gpio_nce || !pdata->gpio_iset2)
  92                return -EINVAL;
  93
  94        ret = gpio_request(pdata->gpio_nce, "ncharge_en");
  95        if (ret) {
  96                dev_dbg(&pdev->dev, "couldn't request nCE GPIO: %d\n",
  97                        pdata->gpio_nce);
  98                goto err_ce;
  99        }
 100        ret = gpio_request(pdata->gpio_iset2, "charge_mode");
 101        if (ret) {
 102                dev_dbg(&pdev->dev, "couldn't request ISET2 GPIO: %d\n",
 103                        pdata->gpio_iset2);
 104                goto err_iset2;
 105        }
 106        ret = gpio_direction_output(pdata->gpio_iset2, 0);
 107        ret = gpio_direction_output(pdata->gpio_nce, 1);
 108
 109        bq24022 = regulator_register(&bq24022_desc, &pdev->dev,
 110                                     pdata->init_data, pdata, NULL);
 111        if (IS_ERR(bq24022)) {
 112                dev_dbg(&pdev->dev, "couldn't register regulator\n");
 113                ret = PTR_ERR(bq24022);
 114                goto err_reg;
 115        }
 116        platform_set_drvdata(pdev, bq24022);
 117        dev_dbg(&pdev->dev, "registered regulator\n");
 118
 119        return 0;
 120err_reg:
 121        gpio_free(pdata->gpio_iset2);
 122err_iset2:
 123        gpio_free(pdata->gpio_nce);
 124err_ce:
 125        return ret;
 126}
 127
 128static int __devexit bq24022_remove(struct platform_device *pdev)
 129{
 130        struct bq24022_mach_info *pdata = pdev->dev.platform_data;
 131        struct regulator_dev *bq24022 = platform_get_drvdata(pdev);
 132
 133        regulator_unregister(bq24022);
 134        gpio_free(pdata->gpio_iset2);
 135        gpio_free(pdata->gpio_nce);
 136
 137        return 0;
 138}
 139
 140static struct platform_driver bq24022_driver = {
 141        .driver = {
 142                .name = "bq24022",
 143        },
 144        .remove = __devexit_p(bq24022_remove),
 145};
 146
 147static int __init bq24022_init(void)
 148{
 149        return platform_driver_probe(&bq24022_driver, bq24022_probe);
 150}
 151
 152static void __exit bq24022_exit(void)
 153{
 154        platform_driver_unregister(&bq24022_driver);
 155}
 156
 157module_init(bq24022_init);
 158module_exit(bq24022_exit);
 159
 160MODULE_AUTHOR("Philipp Zabel");
 161MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
 162MODULE_LICENSE("GPL");
 163