| /* |
| * wm8994-regulator.c -- Regulator driver for the WM8994 |
| * |
| * Copyright 2009 Wolfson Microelectronics PLC. |
| * |
| * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/init.h> |
| #include <linux/bitops.h> |
| #include <linux/err.h> |
| #include <linux/platform_device.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/machine.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/slab.h> |
| |
| #include <linux/mfd/wm8994/core.h> |
| #include <linux/mfd/wm8994/registers.h> |
| #include <linux/mfd/wm8994/pdata.h> |
| |
| struct wm8994_ldo { |
| struct regulator_dev *regulator; |
| struct wm8994 *wm8994; |
| struct regulator_consumer_supply supply; |
| struct regulator_init_data init_data; |
| }; |
| |
| #define WM8994_LDO1_MAX_SELECTOR 0x7 |
| #define WM8994_LDO2_MAX_SELECTOR 0x3 |
| |
| static const struct regulator_ops wm8994_ldo1_ops = { |
| .list_voltage = regulator_list_voltage_linear, |
| .map_voltage = regulator_map_voltage_linear, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| }; |
| |
| static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, |
| unsigned int selector) |
| { |
| struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); |
| |
| if (selector > WM8994_LDO2_MAX_SELECTOR) |
| return -EINVAL; |
| |
| switch (ldo->wm8994->type) { |
| case WM8994: |
| return (selector * 100000) + 900000; |
| case WM8958: |
| return (selector * 100000) + 1000000; |
| case WM1811: |
| switch (selector) { |
| case 0: |
| return -EINVAL; |
| default: |
| return (selector * 100000) + 950000; |
| } |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct regulator_ops wm8994_ldo2_ops = { |
| .list_voltage = wm8994_ldo2_list_voltage, |
| .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| }; |
| |
| static const struct regulator_desc wm8994_ldo_desc[] = { |
| { |
| .name = "LDO1", |
| .id = 1, |
| .type = REGULATOR_VOLTAGE, |
| .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, |
| .vsel_reg = WM8994_LDO_1, |
| .vsel_mask = WM8994_LDO1_VSEL_MASK, |
| .ops = &wm8994_ldo1_ops, |
| .min_uV = 2400000, |
| .uV_step = 100000, |
| .enable_time = 3000, |
| .owner = THIS_MODULE, |
| }, |
| { |
| .name = "LDO2", |
| .id = 2, |
| .type = REGULATOR_VOLTAGE, |
| .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, |
| .vsel_reg = WM8994_LDO_2, |
| .vsel_mask = WM8994_LDO2_VSEL_MASK, |
| .ops = &wm8994_ldo2_ops, |
| .enable_time = 3000, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { |
| { .supply = "AVDD1" }, |
| { .supply = "DCVDD" }, |
| }; |
| |
| static const struct regulator_init_data wm8994_ldo_default[] = { |
| { |
| .constraints = { |
| .valid_ops_mask = REGULATOR_CHANGE_STATUS, |
| }, |
| .num_consumer_supplies = 1, |
| }, |
| { |
| .constraints = { |
| .valid_ops_mask = REGULATOR_CHANGE_STATUS, |
| }, |
| .num_consumer_supplies = 1, |
| }, |
| }; |
| |
| static int wm8994_ldo_probe(struct platform_device *pdev) |
| { |
| struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); |
| struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
| int id = pdev->id % ARRAY_SIZE(pdata->ldo); |
| struct regulator_config config = { }; |
| struct wm8994_ldo *ldo; |
| struct gpio_desc *gpiod; |
| int ret; |
| |
| dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); |
| |
| ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); |
| if (!ldo) |
| return -ENOMEM; |
| |
| ldo->wm8994 = wm8994; |
| ldo->supply = wm8994_ldo_consumer[id]; |
| ldo->supply.dev_name = dev_name(wm8994->dev); |
| |
| config.dev = wm8994->dev; |
| config.driver_data = ldo; |
| config.regmap = wm8994->regmap; |
| config.init_data = &ldo->init_data; |
| |
| /* |
| * Look up LDO enable GPIO from the parent device node, we don't |
| * use devm because the regulator core will free the GPIO |
| */ |
| gpiod = gpiod_get_optional(pdev->dev.parent, |
| id ? "wlf,ldo2ena" : "wlf,ldo1ena", |
| GPIOD_OUT_LOW | |
| GPIOD_FLAGS_BIT_NONEXCLUSIVE); |
| if (IS_ERR(gpiod)) |
| return PTR_ERR(gpiod); |
| config.ena_gpiod = gpiod; |
| |
| /* Use default constraints if none set up */ |
| if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { |
| dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", |
| ldo->supply.dev_name, ldo->supply.supply); |
| |
| ldo->init_data = wm8994_ldo_default[id]; |
| ldo->init_data.consumer_supplies = &ldo->supply; |
| if (!gpiod) |
| ldo->init_data.constraints.valid_ops_mask = 0; |
| } else { |
| ldo->init_data = *pdata->ldo[id].init_data; |
| } |
| |
| /* |
| * At this point the GPIO descriptor is handled over to the |
| * regulator core and we need not worry about it on the |
| * error path. |
| */ |
| ldo->regulator = devm_regulator_register(&pdev->dev, |
| &wm8994_ldo_desc[id], |
| &config); |
| if (IS_ERR(ldo->regulator)) { |
| ret = PTR_ERR(ldo->regulator); |
| dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", |
| id + 1, ret); |
| return ret; |
| } |
| |
| platform_set_drvdata(pdev, ldo); |
| |
| return 0; |
| } |
| |
| static struct platform_driver wm8994_ldo_driver = { |
| .probe = wm8994_ldo_probe, |
| .driver = { |
| .name = "wm8994-ldo", |
| }, |
| }; |
| |
| module_platform_driver(wm8994_ldo_driver); |
| |
| /* Module information */ |
| MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| MODULE_DESCRIPTION("WM8994 LDO driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:wm8994-ldo"); |