kernel/drivers/regulator/rc5t583-regulator.c

   1 /*
   2  * Regulator driver for RICOH RC5T583 power management chip.
   3  *
   4  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
   5  * Author: Laxman dewangan <ldewangan@nvidia.com>
   6  *
   7  * based on code
   8  *      Copyright (C) 2011 RICOH COMPANY,LTD
   9  *
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms and conditions of the GNU General Public License,
  13  * version 2, as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  17  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  18  * more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/err.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/regulator/driver.h>
  31 #include <linux/regulator/machine.h>
  32 #include <linux/gpio.h>
  33 #include <linux/mfd/rc5t583.h>
  34
  35 struct rc5t583_regulator_info {
  36         int                     deepsleep_id;
  37
  38         /* Regulator register address.*/
  39         uint8_t                 reg_disc_reg;
  40         uint8_t                 disc_bit;
  41         uint8_t                 deepsleep_reg;
  42
  43         /* Regulator specific turn-on delay  and voltage settling time*/
  44         int                     enable_uv_per_us;
  45
  46         /* Used by regulator core */
  47         struct regulator_desc   desc;
  48 };
  49
  50 struct rc5t583_regulator {
  51         struct rc5t583_regulator_info *reg_info;
  52         struct regulator_dev    *rdev;
  53 };
  54
  55 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
  56 {
  57         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  58         int vsel = regulator_get_voltage_sel_regmap(rdev);
  59         int curr_uV = regulator_list_voltage_linear(rdev, vsel);
  60
  61         return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
  62 }
  63
  64 static struct regulator_ops rc5t583_ops = {
  65         .is_enabled             = regulator_is_enabled_regmap,
  66         .enable                 = regulator_enable_regmap,
  67         .disable                = regulator_disable_regmap,
  68         .enable_time            = rc5t583_regulator_enable_time,
  69         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  70         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  71         .list_voltage           = regulator_list_voltage_linear,
  72         .map_voltage            = regulator_map_voltage_linear,
  73         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
  74 };
  75
  76 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
  77                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
  78 {                                                               \
  79         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
  80         .disc_bit       = _disc_bit,                            \
  81         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
  82         .enable_uv_per_us = _enable_mv * 1000,                  \
  83         .deepsleep_id   = RC5T583_DS_##_id,                     \
  84         .desc = {                                               \
  85                 .name = "rc5t583-regulator-"#_id,               \
  86                 .id = RC5T583_REGULATOR_##_id,                  \
  87                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
  88                 .ops = &rc5t583_ops,                            \
  89                 .type = REGULATOR_VOLTAGE,                      \
  90                 .owner = THIS_MODULE,                           \
  91                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
  92                 .vsel_mask = _vout_mask,                        \
  93                 .enable_reg = RC5T583_REG_##_en_reg,            \
  94                 .enable_mask = BIT(_en_bit),                    \
  95                 .min_uV = _min_mv * 1000,                       \
  96                 .uV_step = _step_uV,                            \
  97                 .ramp_delay = 40 * 1000,                        \
  98         },                                                      \
  99 }
 100
 101 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
 102         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
 103         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
 104         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
 105         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
 106         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
 107         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
 108         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
 109         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
 110         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
 111         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
 112         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
 113         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
 114         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
 115         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
 116 };
 117
 118 static int rc5t583_regulator_probe(struct platform_device *pdev)
 119 {
 120         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
 121         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 122         struct regulator_config config = { };
 123         struct rc5t583_regulator *reg = NULL;
 124         struct rc5t583_regulator *regs;
 125         struct regulator_dev *rdev;
 126         struct rc5t583_regulator_info *ri;
 127         int ret;
 128         int id;
 129
 130         if (!pdata) {
 131                 dev_err(&pdev->dev, "No platform data, exiting...\n");
 132                 return -ENODEV;
 133         }
 134
 135         regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
 136                         sizeof(struct rc5t583_regulator), GFP_KERNEL);
 137         if (!regs)
 138                 return -ENOMEM;
 139
 140
 141         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
 142                 reg = &regs[id];
 143                 ri = &rc5t583_reg_info[id];
 144                 reg->reg_info = ri;
 145
 146                 if (ri->deepsleep_id == RC5T583_DS_NONE)
 147                         goto skip_ext_pwr_config;
 148
 149                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
 150                                 ri->deepsleep_id,
 151                                 pdata->regulator_ext_pwr_control[id],
 152                                 pdata->regulator_deepsleep_slot[id]);
 153                 /*
 154                  * Configuring external control is not a major issue,
 155                  * just give warning.
 156                  */
 157                 if (ret < 0)
 158                         dev_warn(&pdev->dev,
 159                                 "Failed to configure ext control %d\n", id);
 160
 161 skip_ext_pwr_config:
 162                 config.dev = &pdev->dev;
 163                 config.init_data = pdata->reg_init_data[id];
 164                 config.driver_data = reg;
 165                 config.regmap = rc5t583->regmap;
 166
 167                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
 168                 if (IS_ERR(rdev)) {
 169                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 170                                                 ri->desc.name);
 171                         return PTR_ERR(rdev);
 172                 }
 173                 reg->rdev = rdev;
 174         }
 175         platform_set_drvdata(pdev, regs);
 176         return 0;
 177 }
 178
 179 static struct platform_driver rc5t583_regulator_driver = {
 180         .driver = {
 181                 .name   = "rc5t583-regulator",
 182         },
 183         .probe          = rc5t583_regulator_probe,
 184 };
 185
 186 static int __init rc5t583_regulator_init(void)
 187 {
 188         return platform_driver_register(&rc5t583_regulator_driver);
 189 }
 190 subsys_initcall(rc5t583_regulator_init);
 191
 192 static void __exit rc5t583_regulator_exit(void)
 193 {
 194         platform_driver_unregister(&rc5t583_regulator_driver);
 195 }
 196 module_exit(rc5t583_regulator_exit);
 197
 198 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 199 MODULE_DESCRIPTION("RC5T583 regulator driver");
 200 MODULE_ALIAS("platform:rc5t583-regulator");
 201 MODULE_LICENSE("GPL v2");