Commit cbc6a6ed authored by Antonio Ospite's avatar Antonio Ospite Committed by John W. Linville

rfkill: Regulator consumer driver for rfkill

Add a regulator consumer driver for rfkill to enable controlling radio
transmitters connected to voltage regulators using the regulator
framework.

A new "vrfkill" virtual supply is provided to use in platform code.
Signed-off-by: default avatarGuiming Zhuo <gmzhuo@gmail.com>
Signed-off-by: default avatarAntonio Ospite <ospite@studenti.unina.it>
Reviewed-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent bb411b4d
/*
* 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>
*
* 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.
*
*/
#ifndef __LINUX_RFKILL_REGULATOR_H
#define __LINUX_RFKILL_REGULATOR_H
/*
* Use "vrfkill" as supply id when declaring the regulator consumer:
*
* static struct regulator_consumer_supply pcap_regulator_V6_consumers [] = {
* { .dev_name = "rfkill-regulator.0", .supply = "vrfkill" },
* };
*
* If you have several regulator driven rfkill, you can append a numerical id to
* .dev_name as done above, and use the same id when declaring the platform
* device:
*
* static struct rfkill_regulator_platform_data ezx_rfkill_bt_data = {
* .name = "ezx-bluetooth",
* .type = RFKILL_TYPE_BLUETOOTH,
* };
*
* static struct platform_device a910_rfkill = {
* .name = "rfkill-regulator",
* .id = 0,
* .dev = {
* .platform_data = &ezx_rfkill_bt_data,
* },
* };
*/
#include <linux/rfkill.h>
struct rfkill_regulator_platform_data {
char *name; /* the name for the rfkill switch */
enum rfkill_type type; /* the type as specified in rfkill.h */
};
#endif /* __LINUX_RFKILL_REGULATOR_H */
......@@ -22,3 +22,14 @@ config RFKILL_INPUT
depends on RFKILL
depends on INPUT = y || RFKILL = INPUT
default y if !EXPERT
config RFKILL_REGULATOR
tristate "Generic rfkill regulator driver"
depends on RFKILL || !RFKILL
depends on REGULATOR
help
This options enable controlling radio transmitters connected to
voltage regulator using the regulator framework.
To compile this driver as a module, choose M here: the module will
be called rfkill-regulator.
......@@ -5,3 +5,4 @@
rfkill-y += core.o
rfkill-$(CONFIG_RFKILL_INPUT) += input.o
obj-$(CONFIG_RFKILL) += rfkill.o
obj-$(CONFIG_RFKILL_REGULATOR) += rfkill-regulator.o
/*
* 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/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;
pr_debug("%s: blocked: %d\n", __func__, blocked);
if (blocked) {
if (rfkill_data->reg_enabled) {
regulator_disable(rfkill_data->vcc);
rfkill_data->reg_enabled = 0;
}
} else {
if (!rfkill_data->reg_enabled) {
regulator_enable(rfkill_data->vcc);
rfkill_data->reg_enabled = 1;
}
}
pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
regulator_is_enabled(rfkill_data->vcc));
return 0;
}
struct rfkill_ops rfkill_regulator_ops = {
.set_block = rfkill_regulator_set_block,
};
static int __devinit rfkill_regulator_probe(struct platform_device *pdev)
{
struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
struct rfkill_regulator_data *rfkill_data;
struct regulator *vcc;
struct rfkill *rf_kill;
int ret = 0;
if (pdata == NULL) {
dev_err(&pdev->dev, "no platform data\n");
return -ENODEV;
}
if (pdata->name == NULL || pdata->type == 0) {
dev_err(&pdev->dev, "invalid name or type in platform data\n");
return -EINVAL;
}
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) {
dev_err(&pdev->dev, "Cannot alloc rfkill device\n");
ret = -ENOMEM;
goto err_rfkill_alloc;
}
if (regulator_is_enabled(vcc)) {
dev_dbg(&pdev->dev, "Regulator already enabled\n");
rfkill_data->reg_enabled = 1;
}
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);
return 0;
err_rfkill_register:
rfkill_destroy(rf_kill);
err_rfkill_alloc:
kfree(rfkill_data);
err_data_alloc:
regulator_put(vcc);
out:
return ret;
}
static int __devexit 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 struct platform_driver rfkill_regulator_driver = {
.probe = rfkill_regulator_probe,
.remove = __devexit_p(rfkill_regulator_remove),
.driver = {
.name = "rfkill-regulator",
.owner = THIS_MODULE,
},
};
static int __init rfkill_regulator_init(void)
{
return platform_driver_register(&rfkill_regulator_driver);
}
module_init(rfkill_regulator_init);
static void __exit rfkill_regulator_exit(void)
{
platform_driver_unregister(&rfkill_regulator_driver);
}
module_exit(rfkill_regulator_exit);
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");
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment