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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 
 20 static const unsigned int stw481x_vmmc_voltages[] = {
 21         1800000,
 22         1800000,
 23         2850000,
 24         3000000,
 25         1850000,
 26         2600000,
 27         2700000,
 28         3300000,
 29 };
 30 
 31 static 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 
 40 static 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 
 56 static 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 
 91 static const struct of_device_id stw481x_vmmc_match[] = {
 92         { .compatible = "st,stw481x-vmmc", },
 93         {},
 94 };
 95 
 96 static 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 
104 module_platform_driver(stw481x_vmmc_regulator_driver);
105 

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