/* * Regulator driver for STw4810/STw4811 VMMC regulator. * * Copyright (C) 2013 ST-Ericsson SA * Written on behalf of Linaro for ST-Ericsson * * Author: Linus Walleij <linus.walleij@linaro.org> * * License terms: GNU General Public License (GPL) version 2 */ #include <linux/err.h> #include <linux/init.h> #include <linux/mfd/stw481x.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/regulator/of_regulator.h> static const unsigned int stw481x_vmmc_voltages[] = { 1800000, 1800000, 2850000, 3000000, 1850000, 2600000, 2700000, 3300000, }; static struct regulator_ops stw481x_vmmc_ops = { .list_voltage = regulator_list_voltage_table, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, }; static struct regulator_desc vmmc_regulator = { .name = "VMMC", .id = 0, .ops = &stw481x_vmmc_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages), .volt_table = stw481x_vmmc_voltages, .enable_time = 200, /* FIXME: look this up */ .enable_reg = STW_CONF1, .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS, .enable_val = STW_CONF1_PDN_VMMC, .vsel_reg = STW_CONF1, .vsel_mask = STW_CONF1_VMMC_MASK, }; static int stw481x_vmmc_regulator_probe(struct platform_device *pdev) { struct stw481x *stw481x = dev_get_platdata(&pdev->dev); struct regulator_config config = { }; struct regulator_dev *rdev; int ret; /* First disable the external VMMC if it's active */ ret = regmap_update_bits(stw481x->map, STW_CONF2, STW_CONF2_VMMC_EXT, 0); if (ret) { dev_err(&pdev->dev, "could not disable external VMMC\n"); return ret; } /* Register VMMC regulator */ config.dev = &pdev->dev; config.driver_data = stw481x; config.regmap = stw481x->map; config.of_node = pdev->dev.of_node; config.init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node, &vmmc_regulator); rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config); if (IS_ERR(rdev)) { dev_err(&pdev->dev, "error initializing STw481x VMMC regulator\n"); return PTR_ERR(rdev); } dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n"); return 0; } static const struct of_device_id stw481x_vmmc_match[] = { { .compatible = "st,stw481x-vmmc", }, {}, }; static struct platform_driver stw481x_vmmc_regulator_driver = { .driver = { .name = "stw481x-vmmc-regulator", .of_match_table = stw481x_vmmc_match, }, .probe = stw481x_vmmc_regulator_probe, }; module_platform_driver(stw481x_vmmc_regulator_driver);