drivers/regulator/tps65090-regulator.c

   1 /*
   2  * Regulator driver for tps65090 power management chip.
   3  *
   4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   5
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/err.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/regulator/driver.h>
  25 #include <linux/regulator/machine.h>
  26 #include <linux/mfd/tps65090.h>
  27 #include <linux/regulator/tps65090-regulator.h>
  28
  29 struct tps65090_regulator {
  30         int             id;
  31         /* used by regulator core */
  32         struct regulator_desc   desc;
  33
  34         /* Device */
  35         struct device           *dev;
  36 };
  37
  38 static struct regulator_ops tps65090_ops = {
  39         .enable = regulator_enable_regmap,
  40         .disable = regulator_disable_regmap,
  41         .is_enabled = regulator_is_enabled_regmap,
  42 };
  43
  44 #define tps65090_REG(_id)                               \
  45 {                                                       \
  46         .id             = TPS65090_ID_##_id,            \
  47         .desc = {                                       \
  48                 .name = tps65090_rails(_id),            \
  49                 .id = TPS65090_ID_##_id,                \
  50                 .ops = &tps65090_ops,                   \
  51                 .type = REGULATOR_VOLTAGE,              \
  52                 .owner = THIS_MODULE,                   \
  53                 .enable_reg = (TPS65090_ID_##_id) + 12, \
  54                 .enable_mask = BIT(0),                  \
  55         },                                              \
  56 }
  57
  58 static struct tps65090_regulator TPS65090_regulator[] = {
  59         tps65090_REG(DCDC1),
  60         tps65090_REG(DCDC2),
  61         tps65090_REG(DCDC3),
  62         tps65090_REG(FET1),
  63         tps65090_REG(FET2),
  64         tps65090_REG(FET3),
  65         tps65090_REG(FET4),
  66         tps65090_REG(FET5),
  67         tps65090_REG(FET6),
  68         tps65090_REG(FET7),
  69 };
  70
  71 static inline struct tps65090_regulator *find_regulator_info(int id)
  72 {
  73         struct tps65090_regulator *ri;
  74         int i;
  75
  76         for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) {
  77                 ri = &TPS65090_regulator[i];
  78                 if (ri->desc.id == id)
  79                         return ri;
  80         }
  81         return NULL;
  82 }
  83
  84 static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
  85 {
  86         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
  87         struct tps65090_regulator *ri = NULL;
  88         struct regulator_config config = { };
  89         struct regulator_dev *rdev;
  90         struct tps65090_regulator_platform_data *tps_pdata;
  91         int id = pdev->id;
  92
  93         dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
  94
  95         ri = find_regulator_info(id);
  96         if (ri == NULL) {
  97                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
  98                 return -EINVAL;
  99         }
 100         tps_pdata = pdev->dev.platform_data;
 101         ri->dev = &pdev->dev;
 102
 103         config.dev = &pdev->dev;
 104         config.init_data = &tps_pdata->regulator;
 105         config.driver_data = ri;
 106         config.regmap = tps65090_mfd->rmap;
 107
 108         rdev = regulator_register(&ri->desc, &config);
 109         if (IS_ERR(rdev)) {
 110                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 111                                 ri->desc.name);
 112                 return PTR_ERR(rdev);
 113         }
 114
 115         platform_set_drvdata(pdev, rdev);
 116         return 0;
 117 }
 118
 119 static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
 120 {
 121         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 122
 123         regulator_unregister(rdev);
 124         return 0;
 125 }
 126
 127 static struct platform_driver tps65090_regulator_driver = {
 128         .driver = {
 129                 .name   = "tps65090-regulator",
 130                 .owner  = THIS_MODULE,
 131         },
 132         .probe          = tps65090_regulator_probe,
 133         .remove         = __devexit_p(tps65090_regulator_remove),
 134 };
 135
 136 static int __init tps65090_regulator_init(void)
 137 {
 138         return platform_driver_register(&tps65090_regulator_driver);
 139 }
 140 subsys_initcall(tps65090_regulator_init);
 141
 142 static void __exit tps65090_regulator_exit(void)
 143 {
 144         platform_driver_unregister(&tps65090_regulator_driver);
 145 }
 146 module_exit(tps65090_regulator_exit);
 147
 148 MODULE_DESCRIPTION("tps65090 regulator driver");
 149 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 150 MODULE_LICENSE("GPL v2");