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
  23 static 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
  36 static 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
  43 static 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
  53 static 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
  63 static 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
  70 static 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
  78 static struct regulator_desc bq24022_desc = {
  79         .name  = "bq24022",
  80         .ops   = &bq24022_ops,
  81         .type  = REGULATOR_CURRENT,
  82         .owner = THIS_MODULE,
  83 };
  84
  85 static 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);
 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;
 120 err_reg:
 121         gpio_free(pdata->gpio_iset2);
 122 err_iset2:
 123         gpio_free(pdata->gpio_nce);
 124 err_ce:
 125         return ret;
 126 }
 127
 128 static 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
 140 static struct platform_driver bq24022_driver = {
 141         .driver = {
 142                 .name = "bq24022",
 143         },
 144         .remove = __devexit_p(bq24022_remove),
 145 };
 146
 147 static int __init bq24022_init(void)
 148 {
 149         return platform_driver_probe(&bq24022_driver, bq24022_probe);
 150 }
 151
 152 static void __exit bq24022_exit(void)
 153 {
 154         platform_driver_unregister(&bq24022_driver);
 155 }
 156
 157 module_init(bq24022_init);
 158 module_exit(bq24022_exit);
 159
 160 MODULE_AUTHOR("Philipp Zabel");
 161 MODULE_DESCRIPTION("TI bq24022 Li-Ion Charger driver");
 162 MODULE_LICENSE("GPL");