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         /* Chip constraints on regulator behavior */
  44         int                     min_uV;
  45         int                     max_uV;
  46         int                     step_uV;
  47
  48         /* Regulator specific turn-on delay  and voltage settling time*/
  49         int                     enable_uv_per_us;
  50         int                     change_uv_per_us;
  51
  52         /* Used by regulator core */
  53         struct regulator_desc   desc;
  54 };
  55
  56 struct rc5t583_regulator {
  57         struct rc5t583_regulator_info *reg_info;
  58
  59         /* Devices */
  60         struct device           *dev;
  61         struct rc5t583          *mfd;
  62         struct regulator_dev    *rdev;
  63 };
  64
  65 static int rc5t583_list_voltage(struct regulator_dev *rdev, unsigned selector)
  66 {
  67         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  68         struct rc5t583_regulator_info *ri = reg->reg_info;
  69         return ri->min_uV + (ri->step_uV * selector);
  70 }
  71
  72 static int rc5t583_set_voltage(struct regulator_dev *rdev,
  73                                int min_uV, int max_uV, unsigned *selector)
  74 {
  75         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
  76         struct rc5t583_regulator_info *ri = reg->reg_info;
  77         int sel, ret;
  78
  79         if (min_uV < ri->min_uV)
  80                 min_uV = ri->min_uV;
  81
  82         sel = DIV_ROUND_UP(min_uV - ri->min_uV, ri->step_uV);
  83
  84         if (sel >= rdev->desc->n_voltages) {
  85                 dev_err(&rdev->dev, "Invalid selector 0x%02x\n", sel);
  86                 return -EINVAL;
  87         }
  88
  89         *selector = sel;
  90
  91         ret = rc5t583_update(reg->mfd->dev, rdev->desc->vsel_reg, sel,
  92                              rdev->desc->vsel_mask);
  93         if (ret < 0)
  94                 dev_err(&rdev->dev, "Error in update voltage register 0x%02x\n",
  95                         rdev->desc->vsel_reg);
  96         return ret;
  97 }
  98
  99 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
 100 {
 101         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
 102         int vsel = regulator_get_voltage_sel_regmap(rdev);
 103         int curr_uV = rc5t583_list_voltage(rdev, vsel);
 104
 105         return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
 106 }
 107
 108 static int rc5t583_set_voltage_time_sel(struct regulator_dev *rdev,
 109                 unsigned int old_selector, unsigned int new_selector)
 110 {
 111         struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
 112         int old_uV, new_uV;
 113         old_uV = rc5t583_list_voltage(rdev, old_selector);
 114
 115         if (old_uV < 0)
 116                 return old_uV;
 117
 118         new_uV = rc5t583_list_voltage(rdev, new_selector);
 119         if (new_uV < 0)
 120                 return new_uV;
 121
 122         return DIV_ROUND_UP(abs(old_uV - new_uV),
 123                                 reg->reg_info->change_uv_per_us);
 124 }
 125
 126
 127 static struct regulator_ops rc5t583_ops = {
 128         .is_enabled             = regulator_is_enabled_regmap,
 129         .enable                 = regulator_enable_regmap,
 130         .disable                = regulator_disable_regmap,
 131         .enable_time            = rc5t583_regulator_enable_time,
 132         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 133         .set_voltage            = rc5t583_set_voltage,
 134         .list_voltage           = rc5t583_list_voltage,
 135         .set_voltage_time_sel   = rc5t583_set_voltage_time_sel,
 136 };
 137
 138 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
 139                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
 140 {                                                               \
 141         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
 142         .disc_bit       = _disc_bit,                            \
 143         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
 144         .min_uV         = _min_mv * 1000,                       \
 145         .max_uV         = _max_mv * 1000,                       \
 146         .step_uV        = _step_uV,                             \
 147         .enable_uv_per_us = _enable_mv * 1000,                  \
 148         .change_uv_per_us = 40 * 1000,                          \
 149         .deepsleep_id   = RC5T583_DS_##_id,                     \
 150         .desc = {                                               \
 151                 .name = "rc5t583-regulator-"#_id,               \
 152                 .id = RC5T583_REGULATOR_##_id,                  \
 153                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
 154                 .ops = &rc5t583_ops,                            \
 155                 .type = REGULATOR_VOLTAGE,                      \
 156                 .owner = THIS_MODULE,                           \
 157                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
 158                 .vsel_mask = _vout_mask,                        \
 159                 .enable_reg = RC5T583_REG_##_en_reg,            \
 160                 .enable_mask = BIT(_en_bit),                    \
 161         },                                                      \
 162 }
 163
 164 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
 165         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
 166         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
 167         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
 168         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
 169         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
 170         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
 171         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
 172         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
 173         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
 174         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
 175         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
 176         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
 177         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
 178         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
 179 };
 180
 181 static int __devinit rc5t583_regulator_probe(struct platform_device *pdev)
 182 {
 183         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
 184         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
 185         struct regulator_init_data *reg_data;
 186         struct regulator_config config = { };
 187         struct rc5t583_regulator *reg = NULL;
 188         struct rc5t583_regulator *regs;
 189         struct regulator_dev *rdev;
 190         struct rc5t583_regulator_info *ri;
 191         int ret;
 192         int id;
 193
 194         if (!pdata) {
 195                 dev_err(&pdev->dev, "No platform data, exiting...\n");
 196                 return -ENODEV;
 197         }
 198
 199         regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
 200                         sizeof(struct rc5t583_regulator), GFP_KERNEL);
 201         if (!regs) {
 202                 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 203                 return -ENOMEM;
 204         }
 205
 206
 207         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
 208                 reg_data = pdata->reg_init_data[id];
 209
 210                 /* No need to register if there is no regulator data */
 211                 if (!reg_data)
 212                         continue;
 213
 214                 reg = &regs[id];
 215                 ri = &rc5t583_reg_info[id];
 216                 reg->reg_info = ri;
 217                 reg->mfd = rc5t583;
 218                 reg->dev = &pdev->dev;
 219
 220                 if (ri->deepsleep_id == RC5T583_DS_NONE)
 221                         goto skip_ext_pwr_config;
 222
 223                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
 224                                 ri->deepsleep_id,
 225                                 pdata->regulator_ext_pwr_control[id],
 226                                 pdata->regulator_deepsleep_slot[id]);
 227                 /*
 228                  * Configuring external control is not a major issue,
 229                  * just give warning.
 230                  */
 231                 if (ret < 0)
 232                         dev_warn(&pdev->dev,
 233                                 "Failed to configure ext control %d\n", id);
 234
 235 skip_ext_pwr_config:
 236                 config.dev = &pdev->dev;
 237                 config.init_data = reg_data;
 238                 config.driver_data = reg;
 239                 config.regmap = rc5t583->regmap;
 240
 241                 rdev = regulator_register(&ri->desc, &config);
 242                 if (IS_ERR(rdev)) {
 243                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 244                                                 ri->desc.name);
 245                         ret = PTR_ERR(rdev);
 246                         goto clean_exit;
 247                 }
 248                 reg->rdev = rdev;
 249         }
 250         platform_set_drvdata(pdev, regs);
 251         return 0;
 252
 253 clean_exit:
 254         while (--id >= 0)
 255                 regulator_unregister(regs[id].rdev);
 256
 257         return ret;
 258 }
 259
 260 static int __devexit rc5t583_regulator_remove(struct platform_device *pdev)
 261 {
 262         struct rc5t583_regulator *regs = platform_get_drvdata(pdev);
 263         int id;
 264
 265         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id)
 266                 regulator_unregister(regs[id].rdev);
 267         return 0;
 268 }
 269
 270 static struct platform_driver rc5t583_regulator_driver = {
 271         .driver = {
 272                 .name   = "rc5t583-regulator",
 273                 .owner  = THIS_MODULE,
 274         },
 275         .probe          = rc5t583_regulator_probe,
 276         .remove         = __devexit_p(rc5t583_regulator_remove),
 277 };
 278
 279 static int __init rc5t583_regulator_init(void)
 280 {
 281         return platform_driver_register(&rc5t583_regulator_driver);
 282 }
 283 subsys_initcall(rc5t583_regulator_init);
 284
 285 static void __exit rc5t583_regulator_exit(void)
 286 {
 287         platform_driver_unregister(&rc5t583_regulator_driver);
 288 }
 289 module_exit(rc5t583_regulator_exit);
 290
 291 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 292 MODULE_DESCRIPTION("RC5T583 regulator driver");
 293 MODULE_ALIAS("platform:rc5t583-regulator");
 294 MODULE_LICENSE("GPL v2");