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
  28 struct tps65090_regulator {
  29         struct device           *dev;
  30         struct regulator_desc   *desc;
  31         struct regulator_dev    *rdev;
  32 };
  33
  34 static struct regulator_ops tps65090_ops = {
  35         .enable = regulator_enable_regmap,
  36         .disable = regulator_disable_regmap,
  37         .is_enabled = regulator_is_enabled_regmap,
  38 };
  39
  40 #define tps65090_REG_DESC(_id, _sname, _en_reg, _ops)   \
  41 {                                                       \
  42         .name = "TPS65090_RAILS"#_id,                   \
  43         .supply_name = _sname,                          \
  44         .id = TPS65090_ID_##_id,                        \
  45         .ops = &_ops,                                   \
  46         .enable_reg = _en_reg,                          \
  47         .enable_mask = BIT(0),                          \
  48         .type = REGULATOR_VOLTAGE,                      \
  49         .owner = THIS_MODULE,                           \
  50 }
  51
  52 static struct regulator_desc tps65090_regulator_desc[] = {
  53         tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, tps65090_ops),
  54         tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, tps65090_ops),
  55         tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, tps65090_ops),
  56         tps65090_REG_DESC(FET1,  "infet1",  0x0F, tps65090_ops),
  57         tps65090_REG_DESC(FET2,  "infet2",  0x10, tps65090_ops),
  58         tps65090_REG_DESC(FET3,  "infet3",  0x11, tps65090_ops),
  59         tps65090_REG_DESC(FET4,  "infet4",  0x12, tps65090_ops),
  60         tps65090_REG_DESC(FET5,  "infet5",  0x13, tps65090_ops),
  61         tps65090_REG_DESC(FET6,  "infet6",  0x14, tps65090_ops),
  62         tps65090_REG_DESC(FET7,  "infet7",  0x15, tps65090_ops),
  63 };
  64
  65 static inline bool is_dcdc(int id)
  66 {
  67         switch (id) {
  68         case TPS65090_ID_DCDC1:
  69         case TPS65090_ID_DCDC2:
  70         case TPS65090_ID_DCDC3:
  71                 return true;
  72         default:
  73                 return false;
  74         }
  75 }
  76
  77 static int __devinit tps65090_config_ext_control(
  78         struct tps65090_regulator *ri, bool enable)
  79 {
  80         int ret;
  81         struct device *parent = ri->dev->parent;
  82         unsigned int reg_en_reg = ri->desc->enable_reg;
  83
  84         if (enable)
  85                 ret = tps65090_set_bits(parent, reg_en_reg, 1);
  86         else
  87                 ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
  88         if (ret < 0)
  89                 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
  90         return ret;
  91 }
  92
  93 static int __devinit tps65090_regulator_disable_ext_control(
  94                 struct tps65090_regulator *ri,
  95                 struct tps65090_regulator_plat_data *tps_pdata)
  96 {
  97         int ret = 0;
  98         struct device *parent = ri->dev->parent;
  99         unsigned int reg_en_reg = ri->desc->enable_reg;
 100
 101         /*
 102          * First enable output for internal control if require.
 103          * And then disable external control.
 104          */
 105         if (tps_pdata->reg_init_data->constraints.always_on ||
 106                         tps_pdata->reg_init_data->constraints.boot_on) {
 107                 ret =  tps65090_set_bits(parent, reg_en_reg, 0);
 108                 if (ret < 0) {
 109                         dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
 110                         return ret;
 111                 }
 112         }
 113         return tps65090_config_ext_control(ri, false);
 114 }
 115
 116 static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
 117 {
 118         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
 119         struct tps65090_regulator *ri = NULL;
 120         struct regulator_config config = { };
 121         struct regulator_dev *rdev;
 122         struct tps65090_regulator_plat_data *tps_pdata;
 123         struct tps65090_regulator *pmic;
 124         struct tps65090_platform_data *tps65090_pdata;
 125         int num;
 126         int ret;
 127
 128         dev_dbg(&pdev->dev, "Probing regulator\n");
 129
 130         tps65090_pdata = dev_get_platdata(pdev->dev.parent);
 131         if (!tps65090_pdata) {
 132                 dev_err(&pdev->dev, "Platform data missing\n");
 133                 return -EINVAL;
 134         }
 135
 136         pmic = devm_kzalloc(&pdev->dev, TPS65090_ID_MAX * sizeof(*pmic),
 137                         GFP_KERNEL);
 138         if (!pmic) {
 139                 dev_err(&pdev->dev, "mem alloc for pmic failed\n");
 140                 return -ENOMEM;
 141         }
 142
 143         for (num = 0; num < TPS65090_ID_MAX; num++) {
 144                 tps_pdata = tps65090_pdata->reg_pdata[num];
 145
 146                 ri = &pmic[num];
 147                 ri->dev = &pdev->dev;
 148                 ri->desc = &tps65090_regulator_desc[num];
 149
 150                 /*
 151                  * TPS5090 DCDC support the control from external digital input.
 152                  * It may be possible that during boot, the external control is
 153                  * enabled. Disabling external control for DCDC.
 154                  */
 155                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
 156                         ret = tps65090_regulator_disable_ext_control(
 157                                                 ri, tps_pdata);
 158                         if (ret < 0) {
 159                                 dev_err(&pdev->dev,
 160                                                 "failed disable ext control\n");
 161                                 goto scrub;
 162                         }
 163                 }
 164                 config.dev = &pdev->dev;
 165                 config.driver_data = ri;
 166                 config.regmap = tps65090_mfd->rmap;
 167                 if (tps_pdata)
 168                         config.init_data = tps_pdata->reg_init_data;
 169                 else
 170                         config.init_data = NULL;
 171
 172                 rdev = regulator_register(ri->desc, &config);
 173                 if (IS_ERR(rdev)) {
 174                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 175                                 ri->desc->name);
 176                         ret = PTR_ERR(rdev);
 177                         goto scrub;
 178                 }
 179                 ri->rdev = rdev;
 180         }
 181
 182         platform_set_drvdata(pdev, pmic);
 183         return 0;
 184
 185 scrub:
 186         while (--num >= 0) {
 187                 ri = &pmic[num];
 188                 regulator_unregister(ri->rdev);
 189         }
 190         return ret;
 191 }
 192
 193 static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
 194 {
 195         struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
 196         struct tps65090_regulator *ri;
 197         int num;
 198
 199         for (num = 0; num < TPS65090_ID_MAX; ++num) {
 200                 ri = &pmic[num];
 201                 regulator_unregister(ri->rdev);
 202         }
 203         return 0;
 204 }
 205
 206 static struct platform_driver tps65090_regulator_driver = {
 207         .driver = {
 208                 .name   = "tps65090-regulator",
 209                 .owner  = THIS_MODULE,
 210         },
 211         .probe          = tps65090_regulator_probe,
 212         .remove         = __devexit_p(tps65090_regulator_remove),
 213 };
 214
 215 static int __init tps65090_regulator_init(void)
 216 {
 217         return platform_driver_register(&tps65090_regulator_driver);
 218 }
 219 subsys_initcall(tps65090_regulator_init);
 220
 221 static void __exit tps65090_regulator_exit(void)
 222 {
 223         platform_driver_unregister(&tps65090_regulator_driver);
 224 }
 225 module_exit(tps65090_regulator_exit);
 226
 227 MODULE_DESCRIPTION("tps65090 regulator driver");
 228 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 229 MODULE_LICENSE("GPL v2");