LXR linux/drivers/regulator/stw481x-vmmc.c

   1/*
   2 * Regulator driver for STw4810/STw4811 VMMC regulator.
   3 *
   4 * Copyright (C) 2013 ST-Ericsson SA
   5 * Written on behalf of Linaro for ST-Ericsson
   6 *
   7 * Author: Linus Walleij <linus.walleij@linaro.org>
   8 *
   9 * License terms: GNU General Public License (GPL) version 2
  10 */
  11
  12#include <linux/err.h>
  13#include <linux/init.h>
  14#include <linux/mfd/stw481x.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17#include <linux/regulator/driver.h>
  18#include <linux/regulator/of_regulator.h>
  19
  20static const unsigned int stw481x_vmmc_voltages[] = {
  21        1800000,
  22        1800000,
  23        2850000,
  24        3000000,
  25        1850000,
  26        2600000,
  27        2700000,
  28        3300000,
  29};
  30
  31static struct regulator_ops stw481x_vmmc_ops = {
  32        .list_voltage = regulator_list_voltage_table,
  33        .enable      = regulator_enable_regmap,
  34        .disable     = regulator_disable_regmap,
  35        .is_enabled  = regulator_is_enabled_regmap,
  36        .get_voltage_sel = regulator_get_voltage_sel_regmap,
  37        .set_voltage_sel = regulator_set_voltage_sel_regmap,
  38};
  39
  40static struct regulator_desc vmmc_regulator = {
  41        .name = "VMMC",
  42        .id   = 0,
  43        .ops  = &stw481x_vmmc_ops,
  44        .type = REGULATOR_VOLTAGE,
  45        .owner = THIS_MODULE,
  46        .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
  47        .volt_table = stw481x_vmmc_voltages,
  48        .enable_time = 200, /* FIXME: look this up */
  49        .enable_reg = STW_CONF1,
  50        .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
  51        .enable_val = STW_CONF1_PDN_VMMC,
  52        .vsel_reg = STW_CONF1,
  53        .vsel_mask = STW_CONF1_VMMC_MASK,
  54};
  55
  56static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
  57{
  58        struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
  59        struct regulator_config config = { };
  60        struct regulator_dev *rdev;
  61        int ret;
  62
  63        /* First disable the external VMMC if it's active */
  64        ret = regmap_update_bits(stw481x->map, STW_CONF2,
  65                                 STW_CONF2_VMMC_EXT, 0);
  66        if (ret) {
  67                dev_err(&pdev->dev, "could not disable external VMMC\n");
  68                return ret;
  69        }
  70
  71        /* Register VMMC regulator */
  72        config.dev = &pdev->dev;
  73        config.driver_data = stw481x;
  74        config.regmap = stw481x->map;
  75        config.of_node = pdev->dev.of_node;
  76        config.init_data = of_get_regulator_init_data(&pdev->dev,
  77                                                      pdev->dev.of_node,
  78                                                      &vmmc_regulator);
  79
  80        rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
  81        if (IS_ERR(rdev)) {
  82                dev_err(&pdev->dev,
  83                        "error initializing STw481x VMMC regulator\n");
  84                return PTR_ERR(rdev);
  85        }
  86
  87        dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
  88        return 0;
  89}
  90
  91static const struct of_device_id stw481x_vmmc_match[] = {
  92        { .compatible = "st,stw481x-vmmc", },
  93        {},
  94};
  95
  96static struct platform_driver stw481x_vmmc_regulator_driver = {
  97        .driver = {
  98                .name  = "stw481x-vmmc-regulator",
  99                .of_match_table = stw481x_vmmc_match,
 100        },
 101        .probe = stw481x_vmmc_regulator_probe,
 102};
 103
 104module_platform_driver(stw481x_vmmc_regulator_driver);
 105