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120 lines
3.3 KiB
120 lines
3.3 KiB
/* |
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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 regmap *regmap; |
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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 = regmap_read(reg->regmap, 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 regmap_write(reg->regmap, 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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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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return -ENOMEM; |
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reg->regmap = devm_regmap_init_vexpress_config(&pdev->dev); |
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if (IS_ERR(reg->regmap)) |
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return PTR_ERR(reg->regmap); |
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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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return -EINVAL; |
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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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return PTR_ERR(reg->regdev); |
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platform_set_drvdata(pdev, reg); |
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return 0; |
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} |
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static const 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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.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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