drivers/regulator/sky81452-regulator.c

   1 /*
   2  * sky81452-regulator.c SKY81452 regulator driver
   3  *
   4  * Copyright 2014 Skyworks Solutions Inc.
   5  * Author : Gyungoh Yoo <jack.yoo@skyworksinc.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/kernel.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/init.h>
  25 #include <linux/err.h>
  26 #include <linux/of.h>
  27 #include <linux/regulator/driver.h>
  28 #include <linux/regulator/of_regulator.h>
  29
  30 /* registers */
  31 #define SKY81452_REG1   0x01
  32 #define SKY81452_REG3   0x03
  33
  34 /* bit mask */
  35 #define SKY81452_LEN    0x40
  36 #define SKY81452_LOUT   0x1F
  37
  38 static struct regulator_ops sky81452_reg_ops = {
  39         .list_voltage = regulator_list_voltage_linear_range,
  40         .map_voltage = regulator_map_voltage_linear_range,
  41         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  42         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  43         .enable = regulator_enable_regmap,
  44         .disable = regulator_disable_regmap,
  45         .is_enabled = regulator_is_enabled_regmap,
  46 };
  47
  48 static const struct regulator_linear_range sky81452_reg_ranges[] = {
  49         REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000),
  50         REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000),
  51 };
  52
  53 static const struct regulator_desc sky81452_reg = {
  54         .name = "LOUT",
  55         .ops = &sky81452_reg_ops,
  56         .type = REGULATOR_VOLTAGE,
  57         .owner = THIS_MODULE,
  58         .n_voltages = SKY81452_LOUT + 1,
  59         .linear_ranges = sky81452_reg_ranges,
  60         .n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges),
  61         .vsel_reg = SKY81452_REG3,
  62         .vsel_mask = SKY81452_LOUT,
  63         .enable_reg = SKY81452_REG1,
  64         .enable_mask = SKY81452_LEN,
  65 };
  66
  67 #ifdef CONFIG_OF
  68 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
  69 {
  70         struct regulator_init_data *init_data;
  71         struct device_node *np;
  72
  73         np = of_get_child_by_name(dev->parent->of_node, "regulator");
  74         if (unlikely(!np)) {
  75                 dev_err(dev, "regulator node not found");
  76                 return NULL;
  77         }
  78
  79         init_data = of_get_regulator_init_data(dev, np);
  80
  81         of_node_put(np);
  82         return init_data;
  83 }
  84 #else
  85 static struct regulator_init_data *sky81452_reg_parse_dt(struct device *dev)
  86 {
  87         return ERR_PTR(-EINVAL);
  88 }
  89 #endif
  90
  91 static int sky81452_reg_probe(struct platform_device *pdev)
  92 {
  93         struct device *dev = &pdev->dev;
  94         const struct regulator_init_data *init_data = dev_get_platdata(dev);
  95         struct regulator_config config = { };
  96         struct regulator_dev *rdev;
  97
  98         if (!init_data) {
  99                 init_data = sky81452_reg_parse_dt(dev);
 100                 if (IS_ERR(init_data))
 101                         return PTR_ERR(init_data);
 102         }
 103
 104         config.dev = dev;
 105         config.init_data = init_data;
 106         config.of_node = dev->of_node;
 107         config.regmap = dev_get_drvdata(dev->parent);
 108
 109         rdev = devm_regulator_register(dev, &sky81452_reg, &config);
 110         if (IS_ERR(rdev))
 111                 return PTR_ERR(rdev);
 112
 113         platform_set_drvdata(pdev, rdev);
 114
 115         return 0;
 116 }
 117
 118 static struct platform_driver sky81452_reg_driver = {
 119         .driver = {
 120                 .name = "sky81452-regulator",
 121         },
 122         .probe = sky81452_reg_probe,
 123 };
 124
 125 module_platform_driver(sky81452_reg_driver);
 126
 127 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
 128 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
 129 MODULE_LICENSE("GPL");
 130 MODULE_VERSION("1.0");