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 version 2
   9  * as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/init.h>
  24 #include <linux/err.h>
  25 #include <linux/of.h>
  26 #include <linux/regulator/driver.h>
  27 #include <linux/regulator/of_regulator.h>
  28
  29 /* registers */
  30 #define SKY81452_REG1   0x01
  31 #define SKY81452_REG3   0x03
  32
  33 /* bit mask */
  34 #define SKY81452_LEN    0x40
  35 #define SKY81452_LOUT   0x1F
  36
  37 static struct regulator_ops sky81452_reg_ops = {
  38         .list_voltage = regulator_list_voltage_linear_range,
  39         .map_voltage = regulator_map_voltage_linear_range,
  40         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  41         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  42         .enable = regulator_enable_regmap,
  43         .disable = regulator_disable_regmap,
  44         .is_enabled = regulator_is_enabled_regmap,
  45 };
  46
  47 static const struct regulator_linear_range sky81452_reg_ranges[] = {
  48         REGULATOR_LINEAR_RANGE(4500000, 0, 14, 250000),
  49         REGULATOR_LINEAR_RANGE(9000000, 15, 31, 1000000),
  50 };
  51
  52 static const struct regulator_desc sky81452_reg = {
  53         .name = "LOUT",
  54         .of_match = of_match_ptr("lout"),
  55         .regulators_node = of_match_ptr("regulator"),
  56         .ops = &sky81452_reg_ops,
  57         .type = REGULATOR_VOLTAGE,
  58         .owner = THIS_MODULE,
  59         .n_voltages = SKY81452_LOUT + 1,
  60         .linear_ranges = sky81452_reg_ranges,
  61         .n_linear_ranges = ARRAY_SIZE(sky81452_reg_ranges),
  62         .vsel_reg = SKY81452_REG3,
  63         .vsel_mask = SKY81452_LOUT,
  64         .enable_reg = SKY81452_REG1,
  65         .enable_mask = SKY81452_LEN,
  66 };
  67
  68 static int sky81452_reg_probe(struct platform_device *pdev)
  69 {
  70         struct device *dev = &pdev->dev;
  71         const struct regulator_init_data *init_data = dev_get_platdata(dev);
  72         struct regulator_config config = { };
  73         struct regulator_dev *rdev;
  74
  75         config.dev = dev->parent;
  76         config.init_data = init_data;
  77         config.of_node = dev->of_node;
  78         config.regmap = dev_get_drvdata(dev->parent);
  79
  80         rdev = devm_regulator_register(dev, &sky81452_reg, &config);
  81         if (IS_ERR(rdev)) {
  82                 dev_err(dev, "failed to register. err=%ld\n", PTR_ERR(rdev));
  83                 return PTR_ERR(rdev);
  84         }
  85
  86         platform_set_drvdata(pdev, rdev);
  87
  88         return 0;
  89 }
  90
  91 static struct platform_driver sky81452_reg_driver = {
  92         .driver = {
  93                 .name = "sky81452-regulator",
  94         },
  95         .probe = sky81452_reg_probe,
  96 };
  97
  98 module_platform_driver(sky81452_reg_driver);
  99
 100 MODULE_DESCRIPTION("Skyworks SKY81452 Regulator driver");
 101 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@skyworksinc.com>");
 102 MODULE_LICENSE("GPL v2");