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203 lines
5.1 KiB
203 lines
5.1 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// |
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// wm8994-regulator.c -- Regulator driver for the WM8994 |
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// |
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// Copyright 2009 Wolfson Microelectronics PLC. |
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// |
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// Author: Mark Brown <[email protected]> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/init.h> |
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#include <linux/bitops.h> |
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#include <linux/err.h> |
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#include <linux/platform_device.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/machine.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/slab.h> |
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#include <linux/mfd/wm8994/core.h> |
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#include <linux/mfd/wm8994/registers.h> |
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#include <linux/mfd/wm8994/pdata.h> |
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struct wm8994_ldo { |
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struct regulator_dev *regulator; |
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struct wm8994 *wm8994; |
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struct regulator_consumer_supply supply; |
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struct regulator_init_data init_data; |
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}; |
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#define WM8994_LDO1_MAX_SELECTOR 0x7 |
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#define WM8994_LDO2_MAX_SELECTOR 0x3 |
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static const struct regulator_ops wm8994_ldo1_ops = { |
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.list_voltage = regulator_list_voltage_linear, |
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.map_voltage = regulator_map_voltage_linear, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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}; |
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static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev, |
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unsigned int selector) |
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{ |
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev); |
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if (selector > WM8994_LDO2_MAX_SELECTOR) |
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return -EINVAL; |
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switch (ldo->wm8994->type) { |
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case WM8994: |
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return (selector * 100000) + 900000; |
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case WM8958: |
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return (selector * 100000) + 1000000; |
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case WM1811: |
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switch (selector) { |
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case 0: |
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return -EINVAL; |
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default: |
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return (selector * 100000) + 950000; |
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} |
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break; |
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default: |
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return -EINVAL; |
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} |
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} |
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static const struct regulator_ops wm8994_ldo2_ops = { |
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.list_voltage = wm8994_ldo2_list_voltage, |
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.get_voltage_sel = regulator_get_voltage_sel_regmap, |
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.set_voltage_sel = regulator_set_voltage_sel_regmap, |
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}; |
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static const struct regulator_desc wm8994_ldo_desc[] = { |
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{ |
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.name = "LDO1", |
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.id = 1, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1, |
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.vsel_reg = WM8994_LDO_1, |
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.vsel_mask = WM8994_LDO1_VSEL_MASK, |
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.ops = &wm8994_ldo1_ops, |
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.min_uV = 2400000, |
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.uV_step = 100000, |
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.enable_time = 3000, |
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.owner = THIS_MODULE, |
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}, |
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{ |
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.name = "LDO2", |
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.id = 2, |
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.type = REGULATOR_VOLTAGE, |
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.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1, |
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.vsel_reg = WM8994_LDO_2, |
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.vsel_mask = WM8994_LDO2_VSEL_MASK, |
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.ops = &wm8994_ldo2_ops, |
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.enable_time = 3000, |
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.owner = THIS_MODULE, |
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}, |
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}; |
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static const struct regulator_consumer_supply wm8994_ldo_consumer[] = { |
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{ .supply = "AVDD1" }, |
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{ .supply = "DCVDD" }, |
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}; |
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static const struct regulator_init_data wm8994_ldo_default[] = { |
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{ |
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.constraints = { |
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.valid_ops_mask = REGULATOR_CHANGE_STATUS, |
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}, |
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.num_consumer_supplies = 1, |
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}, |
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{ |
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.constraints = { |
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.valid_ops_mask = REGULATOR_CHANGE_STATUS, |
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}, |
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.num_consumer_supplies = 1, |
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}, |
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}; |
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static int wm8994_ldo_probe(struct platform_device *pdev) |
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{ |
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struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent); |
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struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev); |
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int id = pdev->id % ARRAY_SIZE(pdata->ldo); |
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struct regulator_config config = { }; |
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struct wm8994_ldo *ldo; |
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struct gpio_desc *gpiod; |
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int ret; |
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dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1); |
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ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL); |
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if (!ldo) |
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return -ENOMEM; |
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ldo->wm8994 = wm8994; |
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ldo->supply = wm8994_ldo_consumer[id]; |
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ldo->supply.dev_name = dev_name(wm8994->dev); |
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config.dev = wm8994->dev; |
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config.driver_data = ldo; |
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config.regmap = wm8994->regmap; |
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config.init_data = &ldo->init_data; |
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/* |
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* Look up LDO enable GPIO from the parent device node, we don't |
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* use devm because the regulator core will free the GPIO |
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*/ |
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gpiod = gpiod_get_optional(pdev->dev.parent, |
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id ? "wlf,ldo2ena" : "wlf,ldo1ena", |
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GPIOD_OUT_LOW | |
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GPIOD_FLAGS_BIT_NONEXCLUSIVE); |
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if (IS_ERR(gpiod)) |
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return PTR_ERR(gpiod); |
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config.ena_gpiod = gpiod; |
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/* Use default constraints if none set up */ |
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if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) { |
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dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n", |
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ldo->supply.dev_name, ldo->supply.supply); |
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ldo->init_data = wm8994_ldo_default[id]; |
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ldo->init_data.consumer_supplies = &ldo->supply; |
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if (!gpiod) |
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ldo->init_data.constraints.valid_ops_mask = 0; |
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} else { |
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ldo->init_data = *pdata->ldo[id].init_data; |
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} |
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/* |
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* At this point the GPIO descriptor is handled over to the |
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* regulator core and we need not worry about it on the |
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* error path. |
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*/ |
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ldo->regulator = devm_regulator_register(&pdev->dev, |
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&wm8994_ldo_desc[id], |
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&config); |
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if (IS_ERR(ldo->regulator)) { |
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ret = PTR_ERR(ldo->regulator); |
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dev_err(wm8994->dev, "Failed to register LDO%d: %d\n", |
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id + 1, ret); |
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return ret; |
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} |
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platform_set_drvdata(pdev, ldo); |
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return 0; |
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} |
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static struct platform_driver wm8994_ldo_driver = { |
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.probe = wm8994_ldo_probe, |
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.driver = { |
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.name = "wm8994-ldo", |
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}, |
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}; |
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module_platform_driver(wm8994_ldo_driver); |
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/* Module information */ |
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MODULE_AUTHOR("Mark Brown <[email protected]>"); |
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MODULE_DESCRIPTION("WM8994 LDO driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:wm8994-ldo");
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