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regulator: Add GPIO enable control to fixed voltage regulator driver
Now fixed regulators that have their enable pin connected to a GPIO line can use the fixed regulator driver for regulator enable/disable control. The GPIO number and polarity information is passed through platform data. GPIO enable control is achieved using gpiolib. Signed-off-by: Roger Quadros <ext-roger.quadros@nokia.com> Reviewed-by: Philipp Zabel <philipp.zabel@gmail.com> Reviewed-by: Felipe Balbi <felipe.balbi@nokia.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
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parent
a6576cff18
commit
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2 changed files with 110 additions and 2 deletions
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@ -5,6 +5,9 @@
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* Copyright (c) 2009 Nokia Corporation
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* Roger Quadros <ext-roger.quadros@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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@ -20,20 +23,45 @@
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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/fixed.h>
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#include <linux/gpio.h>
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struct fixed_voltage_data {
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struct regulator_desc desc;
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struct regulator_dev *dev;
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int microvolts;
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int gpio;
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unsigned enable_high:1;
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unsigned is_enabled:1;
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};
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static int fixed_voltage_is_enabled(struct regulator_dev *dev)
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{
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return 1;
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struct fixed_voltage_data *data = rdev_get_drvdata(dev);
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return data->is_enabled;
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}
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static int fixed_voltage_enable(struct regulator_dev *dev)
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{
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struct fixed_voltage_data *data = rdev_get_drvdata(dev);
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if (gpio_is_valid(data->gpio)) {
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gpio_set_value_cansleep(data->gpio, data->enable_high);
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data->is_enabled = 1;
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}
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return 0;
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}
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static int fixed_voltage_disable(struct regulator_dev *dev)
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{
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struct fixed_voltage_data *data = rdev_get_drvdata(dev);
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if (gpio_is_valid(data->gpio)) {
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gpio_set_value_cansleep(data->gpio, !data->enable_high);
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data->is_enabled = 0;
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}
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return 0;
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}
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@ -58,6 +86,7 @@ static int fixed_voltage_list_voltage(struct regulator_dev *dev,
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static struct regulator_ops fixed_voltage_ops = {
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.is_enabled = fixed_voltage_is_enabled,
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.enable = fixed_voltage_enable,
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.disable = fixed_voltage_disable,
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.get_voltage = fixed_voltage_get_voltage,
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.list_voltage = fixed_voltage_list_voltage,
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};
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@ -87,13 +116,62 @@ static int regulator_fixed_voltage_probe(struct platform_device *pdev)
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drvdata->desc.n_voltages = 1;
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drvdata->microvolts = config->microvolts;
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drvdata->gpio = config->gpio;
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if (gpio_is_valid(config->gpio)) {
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drvdata->enable_high = config->enable_high;
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/* FIXME: Remove below print warning
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*
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* config->gpio must be set to -EINVAL by platform code if
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* GPIO control is not required. However, early adopters
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* not requiring GPIO control may forget to initialize
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* config->gpio to -EINVAL. This will cause GPIO 0 to be used
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* for GPIO control.
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*
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* This warning will be removed once there are a couple of users
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* for this driver.
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*/
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if (!config->gpio)
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dev_warn(&pdev->dev,
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"using GPIO 0 for regulator enable control\n");
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ret = gpio_request(config->gpio, config->supply_name);
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if (ret) {
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dev_err(&pdev->dev,
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"Could not obtain regulator enable GPIO %d: %d\n",
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config->gpio, ret);
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goto err_name;
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}
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/* set output direction without changing state
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* to prevent glitch
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*/
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drvdata->is_enabled = config->enabled_at_boot;
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ret = drvdata->is_enabled ?
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config->enable_high : !config->enable_high;
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ret = gpio_direction_output(config->gpio, ret);
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if (ret) {
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dev_err(&pdev->dev,
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"Could not configure regulator enable GPIO %d direction: %d\n",
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config->gpio, ret);
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goto err_gpio;
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}
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} else {
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/* Regulator without GPIO control is considered
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* always enabled
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*/
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drvdata->is_enabled = 1;
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}
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drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev,
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config->init_data, drvdata);
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if (IS_ERR(drvdata->dev)) {
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ret = PTR_ERR(drvdata->dev);
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dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
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goto err_name;
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goto err_gpio;
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}
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platform_set_drvdata(pdev, drvdata);
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@ -103,6 +181,9 @@ static int regulator_fixed_voltage_probe(struct platform_device *pdev)
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return 0;
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err_gpio:
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if (gpio_is_valid(config->gpio))
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gpio_free(config->gpio);
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err_name:
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kfree(drvdata->desc.name);
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err:
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@ -118,6 +199,9 @@ static int regulator_fixed_voltage_remove(struct platform_device *pdev)
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kfree(drvdata->desc.name);
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kfree(drvdata);
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if (gpio_is_valid(drvdata->gpio))
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gpio_free(drvdata->gpio);
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return 0;
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}
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@ -5,6 +5,9 @@
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* Copyright (c) 2009 Nokia Corporation
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* Roger Quadros <ext-roger.quadros@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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@ -16,9 +19,30 @@
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struct regulator_init_data;
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/**
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* struct fixed_voltage_config - fixed_voltage_config structure
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* @supply_name: Name of the regulator supply
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* @microvolts: Output voltage of regulator
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* @gpio: GPIO to use for enable control
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* set to -EINVAL if not used
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* @enable_high: Polarity of enable GPIO
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* 1 = Active high, 0 = Active low
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* @enabled_at_boot: Whether regulator has been enabled at
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* boot or not. 1 = Yes, 0 = No
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* This is used to keep the regulator at
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* the default state
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* @init_data: regulator_init_data
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*
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* This structure contains fixed voltage regulator configuration
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* information that must be passed by platform code to the fixed
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* voltage regulator driver.
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*/
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struct fixed_voltage_config {
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const char *supply_name;
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int microvolts;
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int gpio;
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unsigned enable_high:1;
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unsigned enabled_at_boot:1;
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struct regulator_init_data *init_data;
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};
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