156 lines
3.7 KiB
C
156 lines
3.7 KiB
C
/*
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* rfkill-regulator.c - Regulator consumer driver for rfkill
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*
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* Copyright (C) 2009 Guiming Zhuo <gmzhuo@gmail.com>
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* Copyright (C) 2011 Antonio Ospite <ospite@studenti.unina.it>
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*
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* Implementation inspired by leds-regulator driver.
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*
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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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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/consumer.h>
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#include <linux/rfkill.h>
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#include <linux/rfkill-regulator.h>
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struct rfkill_regulator_data {
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struct rfkill *rf_kill;
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bool reg_enabled;
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struct regulator *vcc;
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};
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static int rfkill_regulator_set_block(void *data, bool blocked)
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{
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struct rfkill_regulator_data *rfkill_data = data;
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int ret = 0;
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pr_debug("%s: blocked: %d\n", __func__, blocked);
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if (blocked) {
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if (rfkill_data->reg_enabled) {
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regulator_disable(rfkill_data->vcc);
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rfkill_data->reg_enabled = false;
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}
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} else {
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if (!rfkill_data->reg_enabled) {
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ret = regulator_enable(rfkill_data->vcc);
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if (!ret)
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rfkill_data->reg_enabled = true;
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}
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}
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pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
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regulator_is_enabled(rfkill_data->vcc));
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return ret;
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}
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static struct rfkill_ops rfkill_regulator_ops = {
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.set_block = rfkill_regulator_set_block,
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};
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static int rfkill_regulator_probe(struct platform_device *pdev)
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{
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struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
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struct rfkill_regulator_data *rfkill_data;
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struct regulator *vcc;
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struct rfkill *rf_kill;
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int ret = 0;
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if (pdata == NULL) {
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dev_err(&pdev->dev, "no platform data\n");
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return -ENODEV;
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}
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if (pdata->name == NULL || pdata->type == 0) {
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dev_err(&pdev->dev, "invalid name or type in platform data\n");
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return -EINVAL;
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}
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vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
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if (IS_ERR(vcc)) {
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dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
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ret = PTR_ERR(vcc);
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goto out;
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}
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rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
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if (rfkill_data == NULL) {
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ret = -ENOMEM;
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goto err_data_alloc;
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}
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rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
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pdata->type,
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&rfkill_regulator_ops, rfkill_data);
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if (rf_kill == NULL) {
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ret = -ENOMEM;
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goto err_rfkill_alloc;
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}
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if (regulator_is_enabled(vcc)) {
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dev_dbg(&pdev->dev, "Regulator already enabled\n");
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rfkill_data->reg_enabled = true;
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}
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rfkill_data->vcc = vcc;
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rfkill_data->rf_kill = rf_kill;
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ret = rfkill_register(rf_kill);
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if (ret) {
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dev_err(&pdev->dev, "Cannot register rfkill device\n");
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goto err_rfkill_register;
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}
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platform_set_drvdata(pdev, rfkill_data);
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dev_info(&pdev->dev, "%s initialized\n", pdata->name);
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return 0;
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err_rfkill_register:
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rfkill_destroy(rf_kill);
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err_rfkill_alloc:
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kfree(rfkill_data);
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err_data_alloc:
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regulator_put(vcc);
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out:
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return ret;
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}
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static int rfkill_regulator_remove(struct platform_device *pdev)
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{
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struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
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struct rfkill *rf_kill = rfkill_data->rf_kill;
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rfkill_unregister(rf_kill);
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rfkill_destroy(rf_kill);
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regulator_put(rfkill_data->vcc);
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kfree(rfkill_data);
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return 0;
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}
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static struct platform_driver rfkill_regulator_driver = {
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.probe = rfkill_regulator_probe,
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.remove = rfkill_regulator_remove,
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.driver = {
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.name = "rfkill-regulator",
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.owner = THIS_MODULE,
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},
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};
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module_platform_driver(rfkill_regulator_driver);
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MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
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MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
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MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:rfkill-regulator");
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