309 lines
7.1 KiB
C
309 lines
7.1 KiB
C
/*
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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 <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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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/gpio.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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int enable;
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bool is_enabled;
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struct regulator_dev *regulator;
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struct wm8994 *wm8994;
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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 int wm8994_ldo_enable(struct regulator_dev *rdev)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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/* If we have no soft control assume that the LDO is always enabled. */
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if (!ldo->enable)
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return 0;
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gpio_set_value(ldo->enable, 1);
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ldo->is_enabled = true;
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return 0;
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}
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static int wm8994_ldo_disable(struct regulator_dev *rdev)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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/* If we have no soft control assume that the LDO is always enabled. */
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if (!ldo->enable)
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return -EINVAL;
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gpio_set_value(ldo->enable, 0);
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ldo->is_enabled = false;
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return 0;
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}
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static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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return ldo->is_enabled;
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}
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static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
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{
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/* 3ms is fairly conservative but this shouldn't be too performance
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* critical; can be tweaked per-system if required. */
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return 3000;
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}
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static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
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unsigned int selector)
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{
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if (selector > WM8994_LDO1_MAX_SELECTOR)
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return -EINVAL;
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return (selector * 100000) + 2400000;
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}
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static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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int val;
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val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
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if (val < 0)
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return val;
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val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
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return wm8994_ldo1_list_voltage(rdev, val);
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}
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static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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int selector, v;
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selector = (min_uV - 2400000) / 100000;
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v = wm8994_ldo1_list_voltage(rdev, selector);
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if (v < 0 || v > max_uV)
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return -EINVAL;
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selector <<= WM8994_LDO1_VSEL_SHIFT;
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return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
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WM8994_LDO1_VSEL_MASK, selector);
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}
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static struct regulator_ops wm8994_ldo1_ops = {
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.enable = wm8994_ldo_enable,
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.disable = wm8994_ldo_disable,
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.is_enabled = wm8994_ldo_is_enabled,
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.enable_time = wm8994_ldo_enable_time,
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.list_voltage = wm8994_ldo1_list_voltage,
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.get_voltage = wm8994_ldo1_get_voltage,
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.set_voltage = wm8994_ldo1_set_voltage,
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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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if (selector > WM8994_LDO2_MAX_SELECTOR)
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return -EINVAL;
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return (selector * 100000) + 900000;
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}
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static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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int val;
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val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
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if (val < 0)
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return val;
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val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
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return wm8994_ldo2_list_voltage(rdev, val);
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}
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static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
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int min_uV, int max_uV)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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int selector, v;
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selector = (min_uV - 900000) / 100000;
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v = wm8994_ldo2_list_voltage(rdev, selector);
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if (v < 0 || v > max_uV)
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return -EINVAL;
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selector <<= WM8994_LDO2_VSEL_SHIFT;
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return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
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WM8994_LDO2_VSEL_MASK, selector);
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}
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static struct regulator_ops wm8994_ldo2_ops = {
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.enable = wm8994_ldo_enable,
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.disable = wm8994_ldo_disable,
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.is_enabled = wm8994_ldo_is_enabled,
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.enable_time = wm8994_ldo_enable_time,
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.list_voltage = wm8994_ldo2_list_voltage,
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.get_voltage = wm8994_ldo2_get_voltage,
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.set_voltage = wm8994_ldo2_set_voltage,
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};
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static 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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.ops = &wm8994_ldo1_ops,
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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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.ops = &wm8994_ldo2_ops,
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.owner = THIS_MODULE,
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},
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};
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static __devinit 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 = wm8994->dev->platform_data;
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int id = pdev->id % ARRAY_SIZE(pdata->ldo);
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struct wm8994_ldo *ldo;
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int ret;
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dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
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if (!pdata)
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return -ENODEV;
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ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
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if (ldo == NULL) {
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dev_err(&pdev->dev, "Unable to allocate private data\n");
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return -ENOMEM;
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}
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ldo->wm8994 = wm8994;
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ldo->is_enabled = true;
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if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
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ldo->enable = pdata->ldo[id].enable;
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ret = gpio_request(ldo->enable, "WM8994 LDO enable");
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
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ret);
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goto err;
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}
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ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
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ret);
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goto err_gpio;
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}
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}
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ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
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pdata->ldo[id].init_data, ldo);
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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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goto err_gpio;
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}
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platform_set_drvdata(pdev, ldo);
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return 0;
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err_gpio:
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if (gpio_is_valid(ldo->enable))
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gpio_free(ldo->enable);
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err:
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kfree(ldo);
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return ret;
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}
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static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
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{
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struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
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platform_set_drvdata(pdev, NULL);
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regulator_unregister(ldo->regulator);
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if (gpio_is_valid(ldo->enable))
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gpio_free(ldo->enable);
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kfree(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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.remove = __devexit_p(wm8994_ldo_remove),
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.driver = {
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.name = "wm8994-ldo",
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.owner = THIS_MODULE,
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},
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};
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static int __init wm8994_ldo_init(void)
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{
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int ret;
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ret = platform_driver_register(&wm8994_ldo_driver);
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if (ret != 0)
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pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
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return ret;
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}
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subsys_initcall(wm8994_ldo_init);
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static void __exit wm8994_ldo_exit(void)
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{
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platform_driver_unregister(&wm8994_ldo_driver);
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}
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module_exit(wm8994_ldo_exit);
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/* Module information */
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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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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