rfkill-regulator.c
4.74 KB
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/*
* rfkill-regulator.c - Regulator consumer driver for rfkill
*
* Copyright (C) 2009 Guiming Zhuo <gmzhuo@gmail.com>
* Copyright (C) 2011 Antonio Ospite <ospite@studenti.unina.it>
*
* Implementation inspired by leds-regulator driver.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/of_irq.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/rfkill.h>
#include <linux/rfkill-regulator.h>
struct rfkill_regulator_data {
struct rfkill *rf_kill;
bool reg_enabled;
struct regulator *vcc;
};
static int rfkill_regulator_set_block(void *data, bool blocked)
{
struct rfkill_regulator_data *rfkill_data = data;
int ret = 0;
pr_debug("%s: blocked: %d\n", __func__, blocked);
if (blocked) {
if (rfkill_data->reg_enabled) {
regulator_disable(rfkill_data->vcc);
rfkill_data->reg_enabled = false;
}
} else {
if (!rfkill_data->reg_enabled) {
ret = regulator_enable(rfkill_data->vcc);
if (!ret)
rfkill_data->reg_enabled = true;
}
}
pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
regulator_is_enabled(rfkill_data->vcc));
return ret;
}
static struct rfkill_ops rfkill_regulator_ops = {
.set_block = rfkill_regulator_set_block,
};
static struct rfkill_regulator_platform_data *rfkill_regulator_get_pdata_from_of(struct device *dev)
{
struct rfkill_regulator_platform_data *pdata;
struct device_node *np = dev->of_node;
if (!np) {
np = of_find_matching_node(NULL, dev->driver->of_match_table);
if (!np) {
dev_notice(dev, "device tree node not available\n");
return ERR_PTR(-ENODEV);
}
}
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(dev, "can't allocate platform data\n");
return ERR_PTR(-ENODEV);
}
of_property_read_u32(np, "type", &pdata->type);
of_property_read_string(np, "name", &pdata->name);
return pdata;
}
static int rfkill_regulator_probe(struct platform_device *pdev)
{
struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
struct rfkill_regulator_platform_data *p = NULL;
struct rfkill_regulator_data *rfkill_data;
struct regulator *vcc;
struct rfkill *rf_kill;
int ret = 0;
if (pdata == NULL) {
p = pdata = rfkill_regulator_get_pdata_from_of(&pdev->dev);
if (IS_ERR(p)) {
dev_err(&pdev->dev, "no platform data\n");
return PTR_ERR(p);
}
}
if (pdata->name == NULL || pdata->type == 0) {
dev_err(&pdev->dev, "invalid name or type in platform data\n");
ret = -EINVAL;
goto out;
}
vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
if (IS_ERR(vcc)) {
dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
ret = PTR_ERR(vcc);
goto out;
}
rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
if (rfkill_data == NULL) {
ret = -ENOMEM;
goto err_data_alloc;
}
rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
pdata->type,
&rfkill_regulator_ops, rfkill_data);
if (rf_kill == NULL) {
ret = -ENOMEM;
goto err_rfkill_alloc;
}
if (regulator_is_enabled(vcc)) {
dev_dbg(&pdev->dev, "Regulator already enabled\n");
rfkill_data->reg_enabled = true;
}
rfkill_data->vcc = vcc;
rfkill_data->rf_kill = rf_kill;
ret = rfkill_register(rf_kill);
if (ret) {
dev_err(&pdev->dev, "Cannot register rfkill device\n");
goto err_rfkill_register;
}
platform_set_drvdata(pdev, rfkill_data);
dev_info(&pdev->dev, "%s initialized\n", pdata->name);
kfree(p);
return 0;
err_rfkill_register:
rfkill_destroy(rf_kill);
err_rfkill_alloc:
kfree(rfkill_data);
err_data_alloc:
regulator_put(vcc);
out:
kfree(p);
return ret;
}
static int rfkill_regulator_remove(struct platform_device *pdev)
{
struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
struct rfkill *rf_kill = rfkill_data->rf_kill;
rfkill_unregister(rf_kill);
rfkill_destroy(rf_kill);
regulator_put(rfkill_data->vcc);
kfree(rfkill_data);
return 0;
}
static const struct of_device_id rfkill_regulator_of_match_table[] = {
{ .compatible = "net,rfkill-reg" },
{ }
};
MODULE_DEVICE_TABLE(of, rfkill_regulator_of_match_table);
static struct platform_driver rfkill_regulator_driver = {
.probe = rfkill_regulator_probe,
.remove = rfkill_regulator_remove,
.driver = {
.name = "rfkill-regulator",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(rfkill_regulator_of_match_table),
},
};
module_platform_driver(rfkill_regulator_driver);
MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rfkill-regulator");