diff options
Diffstat (limited to 'drivers/regulator/wm8994-regulator.c')
| -rw-r--r-- | drivers/regulator/wm8994-regulator.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/drivers/regulator/wm8994-regulator.c b/drivers/regulator/wm8994-regulator.c new file mode 100644 index 000000000..750e0bd61 --- /dev/null +++ b/drivers/regulator/wm8994-regulator.c @@ -0,0 +1,199 @@ +/* + * 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.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 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 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; + 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; + if (pdata) { + config.ena_gpio = pdata->ldo[id].enable; + } else if (wm8994->dev->of_node) { + config.ena_gpio = wm8994->pdata.ldo[id].enable; + config.ena_gpio_initialized = true; + } + + /* 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 (!config.ena_gpio) + ldo->init_data.constraints.valid_ops_mask = 0; + } else { + ldo->init_data = *pdata->ldo[id].init_data; + } + + 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); + goto err; + } + + platform_set_drvdata(pdev, ldo); + + return 0; + +err: + return ret; +} + +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"); |