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 static struct regulator_ops tps65090_ldo_ops = {
  41 };
  42
  43 #define tps65090_REG_DESC(_id, _sname, _en_reg, _ops)   \
  44 {                                                       \
  45         .name = "TPS65090_RAILS"#_id,                   \
  46         .supply_name = _sname,                          \
  47         .id = TPS65090_REGULATOR_##_id,                 \
  48         .ops = &_ops,                                   \
  49         .enable_reg = _en_reg,                          \
  50         .enable_mask = BIT(0),                          \
  51         .type = REGULATOR_VOLTAGE,                      \
  52         .owner = THIS_MODULE,                           \
  53 }
  54
  55 static struct regulator_desc tps65090_regulator_desc[] = {
  56         tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, tps65090_ops),
  57         tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, tps65090_ops),
  58         tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, tps65090_ops),
  59         tps65090_REG_DESC(FET1,  "infet1",  0x0F, tps65090_ops),
  60         tps65090_REG_DESC(FET2,  "infet2",  0x10, tps65090_ops),
  61         tps65090_REG_DESC(FET3,  "infet3",  0x11, tps65090_ops),
  62         tps65090_REG_DESC(FET4,  "infet4",  0x12, tps65090_ops),
  63         tps65090_REG_DESC(FET5,  "infet5",  0x13, tps65090_ops),
  64         tps65090_REG_DESC(FET6,  "infet6",  0x14, tps65090_ops),
  65         tps65090_REG_DESC(FET7,  "infet7",  0x15, tps65090_ops),
  66         tps65090_REG_DESC(LDO1,  "vsys_l1", 0,    tps65090_ldo_ops),
  67         tps65090_REG_DESC(LDO2,  "vsys_l2", 0,    tps65090_ldo_ops),
  68 };
  69
  70 static inline bool is_dcdc(int id)
  71 {
  72         switch (id) {
  73         case TPS65090_REGULATOR_DCDC1:
  74         case TPS65090_REGULATOR_DCDC2:
  75         case TPS65090_REGULATOR_DCDC3:
  76                 return true;
  77         default:
  78                 return false;
  79         }
  80 }
  81
  82 static int __devinit tps65090_config_ext_control(
  83         struct tps65090_regulator *ri, bool enable)
  84 {
  85         int ret;
  86         struct device *parent = ri->dev->parent;
  87         unsigned int reg_en_reg = ri->desc->enable_reg;
  88
  89         if (enable)
  90                 ret = tps65090_set_bits(parent, reg_en_reg, 1);
  91         else
  92                 ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
  93         if (ret < 0)
  94                 dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
  95         return ret;
  96 }
  97
  98 static int __devinit tps65090_regulator_disable_ext_control(
  99                 struct tps65090_regulator *ri,
 100                 struct tps65090_regulator_plat_data *tps_pdata)
 101 {
 102         int ret = 0;
 103         struct device *parent = ri->dev->parent;
 104         unsigned int reg_en_reg = ri->desc->enable_reg;
 105
 106         /*
 107          * First enable output for internal control if require.
 108          * And then disable external control.
 109          */
 110         if (tps_pdata->reg_init_data->constraints.always_on ||
 111                         tps_pdata->reg_init_data->constraints.boot_on) {
 112                 ret =  tps65090_set_bits(parent, reg_en_reg, 0);
 113                 if (ret < 0) {
 114                         dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
 115                         return ret;
 116                 }
 117         }
 118         return tps65090_config_ext_control(ri, false);
 119 }
 120
 121 static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
 122 {
 123         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
 124         struct tps65090_regulator *ri = NULL;
 125         struct regulator_config config = { };
 126         struct regulator_dev *rdev;
 127         struct tps65090_regulator_plat_data *tps_pdata;
 128         struct tps65090_regulator *pmic;
 129         struct tps65090_platform_data *tps65090_pdata;
 130         int num;
 131         int ret;
 132
 133         dev_dbg(&pdev->dev, "Probing regulator\n");
 134
 135         tps65090_pdata = dev_get_platdata(pdev->dev.parent);
 136         if (!tps65090_pdata) {
 137                 dev_err(&pdev->dev, "Platform data missing\n");
 138                 return -EINVAL;
 139         }
 140
 141         pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
 142                         GFP_KERNEL);
 143         if (!pmic) {
 144                 dev_err(&pdev->dev, "mem alloc for pmic failed\n");
 145                 return -ENOMEM;
 146         }
 147
 148         for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
 149                 tps_pdata = tps65090_pdata->reg_pdata[num];
 150
 151                 ri = &pmic[num];
 152                 ri->dev = &pdev->dev;
 153                 ri->desc = &tps65090_regulator_desc[num];
 154
 155                 /*
 156                  * TPS5090 DCDC support the control from external digital input.
 157                  * It may be possible that during boot, the external control is
 158                  * enabled. Disabling external control for DCDC.
 159                  */
 160                 if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
 161                         ret = tps65090_regulator_disable_ext_control(
 162                                                 ri, tps_pdata);
 163                         if (ret < 0) {
 164                                 dev_err(&pdev->dev,
 165                                                 "failed disable ext control\n");
 166                                 goto scrub;
 167                         }
 168                 }
 169                 config.dev = &pdev->dev;
 170                 config.driver_data = ri;
 171                 config.regmap = tps65090_mfd->rmap;
 172                 if (tps_pdata)
 173                         config.init_data = tps_pdata->reg_init_data;
 174                 else
 175                         config.init_data = NULL;
 176
 177                 rdev = regulator_register(ri->desc, &config);
 178                 if (IS_ERR(rdev)) {
 179                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 180                                 ri->desc->name);
 181                         ret = PTR_ERR(rdev);
 182                         goto scrub;
 183                 }
 184                 ri->rdev = rdev;
 185         }
 186
 187         platform_set_drvdata(pdev, pmic);
 188         return 0;
 189
 190 scrub:
 191         while (--num >= 0) {
 192                 ri = &pmic[num];
 193                 regulator_unregister(ri->rdev);
 194         }
 195         return ret;
 196 }
 197
 198 static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
 199 {
 200         struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
 201         struct tps65090_regulator *ri;
 202         int num;
 203
 204         for (num = 0; num < TPS65090_REGULATOR_MAX; ++num) {
 205                 ri = &pmic[num];
 206                 regulator_unregister(ri->rdev);
 207         }
 208         return 0;
 209 }
 210
 211 static struct platform_driver tps65090_regulator_driver = {
 212         .driver = {
 213                 .name   = "tps65090-pmic",
 214                 .owner  = THIS_MODULE,
 215         },
 216         .probe          = tps65090_regulator_probe,
 217         .remove         = __devexit_p(tps65090_regulator_remove),
 218 };
 219
 220 static int __init tps65090_regulator_init(void)
 221 {
 222         return platform_driver_register(&tps65090_regulator_driver);
 223 }
 224 subsys_initcall(tps65090_regulator_init);
 225
 226 static void __exit tps65090_regulator_exit(void)
 227 {
 228         platform_driver_unregister(&tps65090_regulator_driver);
 229 }
 230 module_exit(tps65090_regulator_exit);
 231
 232 MODULE_DESCRIPTION("tps65090 regulator driver");
 233 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
 234 MODULE_LICENSE("GPL v2");