mirror of https://gitee.com/openkylin/linux.git
147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2012 ARM Limited
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*/
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#define DRVNAME "vexpress-regulator"
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#define pr_fmt(fmt) DRVNAME ": " fmt
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/of_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/regulator/of_regulator.h>
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#include <linux/vexpress.h>
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struct vexpress_regulator {
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struct regulator_desc desc;
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struct regulator_dev *regdev;
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struct vexpress_config_func *func;
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};
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static int vexpress_regulator_get_voltage(struct regulator_dev *regdev)
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{
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struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
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u32 uV;
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int err = vexpress_config_read(reg->func, 0, &uV);
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return err ? err : uV;
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}
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static int vexpress_regulator_set_voltage(struct regulator_dev *regdev,
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int min_uV, int max_uV, unsigned *selector)
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{
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struct vexpress_regulator *reg = rdev_get_drvdata(regdev);
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return vexpress_config_write(reg->func, 0, min_uV);
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}
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static struct regulator_ops vexpress_regulator_ops_ro = {
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.get_voltage = vexpress_regulator_get_voltage,
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};
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static struct regulator_ops vexpress_regulator_ops = {
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.get_voltage = vexpress_regulator_get_voltage,
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.set_voltage = vexpress_regulator_set_voltage,
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};
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static int vexpress_regulator_probe(struct platform_device *pdev)
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{
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int err;
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struct vexpress_regulator *reg;
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struct regulator_init_data *init_data;
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struct regulator_config config = { };
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reg = devm_kzalloc(&pdev->dev, sizeof(*reg), GFP_KERNEL);
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if (!reg) {
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err = -ENOMEM;
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goto error_kzalloc;
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}
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reg->func = vexpress_config_func_get_by_dev(&pdev->dev);
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if (!reg->func) {
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err = -ENXIO;
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goto error_get_func;
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}
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reg->desc.name = dev_name(&pdev->dev);
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reg->desc.type = REGULATOR_VOLTAGE;
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reg->desc.owner = THIS_MODULE;
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reg->desc.continuous_voltage_range = true;
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init_data = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node);
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if (!init_data) {
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err = -EINVAL;
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goto error_get_regulator_init_data;
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}
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init_data->constraints.apply_uV = 0;
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if (init_data->constraints.min_uV && init_data->constraints.max_uV)
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reg->desc.ops = &vexpress_regulator_ops;
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else
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reg->desc.ops = &vexpress_regulator_ops_ro;
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config.dev = &pdev->dev;
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config.init_data = init_data;
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config.driver_data = reg;
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config.of_node = pdev->dev.of_node;
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reg->regdev = devm_regulator_register(&pdev->dev, ®->desc, &config);
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if (IS_ERR(reg->regdev)) {
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err = PTR_ERR(reg->regdev);
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goto error_regulator_register;
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}
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platform_set_drvdata(pdev, reg);
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return 0;
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error_regulator_register:
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error_get_regulator_init_data:
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vexpress_config_func_put(reg->func);
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error_get_func:
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error_kzalloc:
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return err;
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}
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static int vexpress_regulator_remove(struct platform_device *pdev)
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{
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struct vexpress_regulator *reg = platform_get_drvdata(pdev);
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vexpress_config_func_put(reg->func);
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return 0;
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}
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static struct of_device_id vexpress_regulator_of_match[] = {
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{ .compatible = "arm,vexpress-volt", },
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{ }
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};
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static struct platform_driver vexpress_regulator_driver = {
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.probe = vexpress_regulator_probe,
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.remove = vexpress_regulator_remove,
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.driver = {
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.name = DRVNAME,
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.owner = THIS_MODULE,
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.of_match_table = vexpress_regulator_of_match,
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},
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};
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module_platform_driver(vexpress_regulator_driver);
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MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
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MODULE_DESCRIPTION("Versatile Express regulator");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:vexpress-regulator");
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