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         int                     change_uv_per_us;
  46
  47         /* Used by regulator core */
  48         struct regulator_desc   desc;
  49 };
  50
  51 struct rc5t583_regulator {
  52         struct rc5t583_regulator_info *reg_info;
  53
  54         /* Devices */
  55         struct device           *dev;
  56         struct rc5t583          *mfd;
  57         struct regulator_dev    *rdev;
  58 };
  59
  60 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
  61 {
  62         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  63         int vsel = regulator_get_voltage_sel_regmap(rdev);
  64         int curr_uV = regulator_list_voltage_linear(rdev, vsel);
  65
  66         return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
  67 }
  68
  69 static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
  70                 unsigned int old_selector, unsigned int new_selector)
  71 {
  72         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  73         int old_uV, new_uV;
  74         old_uV = regulator_list_voltage_linear(rdev, old_selector);
  75
  76         if (old_uV < 0)
  77                 return old_uV;
  78
  79         new_uV = regulator_list_voltage_linear(rdev, new_selector);
  80         if (new_uV < 0)
  81                 return new_uV;
  82
  83         return DIV_ROUND_UP(abs(old_uV - new_uV),
  84                                 reg->reg_info->change_uv_per_us);
  85 }
  86
  87
  88 static struct regulator_ops rc5t583_ops = {
  89         .is_enabled             = regulator_is_enabled_regmap,
  90         .enable                 = regulator_enable_regmap,
  91         .disable                = regulator_disable_regmap,
  92         .enable_time            = rc5t583_regulator_enable_time,
  93         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
  94         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
  95         .list_voltage           = regulator_list_voltage_linear,
  96         .map_voltage            = regulator_map_voltage_linear,
  97         .set_voltage_time_sel   = rc5t583_set_voltage_time_sel,
  98 };
  99
 100 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
 101                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
 102 {                                                               \
 103         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
 104         .disc_bit       = _disc_bit,                            \
 105         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
 106         .enable_uv_per_us = _enable_mv * 1000,                  \
 107         .change_uv_per_us = 40 * 1000,                          \
 108         .deepsleep_id   = RC5T583_DS_##_id,                     \
 109         .desc = {                                               \
 110                 .name = "rc5t583-regulator-"#_id,               \
 111                 .id = RC5T583_REGULATOR_##_id,                  \
 112                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
 113                 .ops = &rc5t583_ops,                            \
 114                 .type = REGULATOR_VOLTAGE,                      \
 115                 .owner = THIS_MODULE,                           \
 116                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
 117                 .vsel_mask = _vout_mask,                        \
 118                 .enable_reg = RC5T583_REG_##_en_reg,            \
 119                 .enable_mask = BIT(_en_bit),                    \
 120                 .min_uV = _min_mv * 1000,                       \
 121                 .uV_step = _step_uV,                            \
 122         },                                                      \
 123 }
 124
 125 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
 126         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
 127         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
 128         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
 129         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
 130         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
 131         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
 132         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
 133         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
 134         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
 135         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
 136         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
 137         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
 138         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
 139         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
 140 };
 141
 142 static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
 143 {
 144         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
 145         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 146         struct regulator_init_data *reg_data;
 147         struct regulator_config config = { };
 148         struct rc5t583_regulator *reg = NULL;
 149         struct rc5t583_regulator *regs;
 150         struct regulator_dev *rdev;
 151         struct rc5t583_regulator_info *ri;
 152         int ret;
 153         int id;
 154
 155         if (!pdata) {
 156                 dev_err(&pdev->dev, "No platform data, exiting...\n");
 157                 return -ENODEV;
 158         }
 159
 160         regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
 161                         sizeof(struct rc5t583_regulator), GFP_KERNEL);
 162         if (!regs) {
 163                 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 164                 return -ENOMEM;
 165         }
 166
 167
 168         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
 169                 reg_data = pdata->reg_init_data[id];
 170
 171                 /* No need to register if there is no regulator data */
 172                 if (!reg_data)
 173                         continue;
 174
 175                 reg = &regs[id];
 176                 ri = &rc5t583_reg_info[id];
 177                 reg->reg_info = ri;
 178                 reg->mfd = rc5t583;
 179                 reg->dev = &pdev->dev;
 180
 181                 if (ri->deepsleep_id == RC5T583_DS_NONE)
 182                         goto skip_ext_pwr_config;
 183
 184                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
 185                                 ri->deepsleep_id,
 186                                 pdata->regulator_ext_pwr_control[id],
 187                                 pdata->regulator_deepsleep_slot[id]);
 188                 /*
 189                  * Configuring external control is not a major issue,
 190                  * just give warning.
 191                  */
 192                 if (ret < 0)
 193                         dev_warn(&pdev->dev,
 194                                 "Failed to configure ext control %d\n", id);
 195
 196 skip_ext_pwr_config:
 197                 config.dev = &pdev->dev;
 198                 config.init_data = reg_data;
 199                 config.driver_data = reg;
 200                 config.regmap = rc5t583->regmap;
 201
 202                 rdev = regulator_register(&ri->desc, &config);
 203                 if (IS_ERR(rdev)) {
 204                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 205                                                 ri->desc.name);
 206                         ret = PTR_ERR(rdev);
 207                         goto clean_exit;
 208                 }
 209                 reg->rdev = rdev;
 210         }
 211         platform_set_drvdata(pdev, regs);
 212         return 0;
 213
 214 clean_exit:
 215         while (--id >= 0)
 216                 regulator_unregister(regs[id].rdev);
 217
 218         return ret;
 219 }
 220
 221 static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
 222 {
 223         struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
 224         int id;
 225
 226         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
 227                 regulator_unregister(regs[id].rdev);
 228         return 0;
 229 }
 230
 231 static struct platform_driver rc5t583_regulator_driver = {
 232         .driver = {
 233                 .name   = "rc5t583-regulator",
 234                 .owner  = THIS_MODULE,
 235         },
 236         .probe          = rc5t583_regulator_probe,
 237         .remove         = __devexit_p(rc5t583_regulator_remove),
 238 };
 239
 240 static int __init rc5t583_regulator_init(void)
 241 {
 242         return platform_driver_register(&rc5t583_regulator_driver);
 243 }
 244 subsys_initcall(rc5t583_regulator_init);
 245
 246 static void __exit rc5t583_regulator_exit(void)
 247 {
 248         platform_driver_unregister(&rc5t583_regulator_driver);
 249 }
 250 module_exit(rc5t583_regulator_exit);
 251
 252 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 253 MODULE_DESCRIPTION("RC5T583 regulator driver");
 254 MODULE_ALIAS("platform:rc5t583-regulator");
 255 MODULE_LICENSE("GPL v2");