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linux-next/net/rfkill/rfkill-gpio.c
Thomas Gleixner 1621633323 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  51 franklin street fifth floor boston ma 02110 1301 usa

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option [no]_[pad]_[ctrl] any later version this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not write to the free
  software foundation inc 51 franklin street fifth floor boston ma
  02110 1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 176 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jilayne Lovejoy <opensource@jilayne.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190519154040.652910950@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21 11:28:39 +02:00

174 lines
4.0 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2011, NVIDIA Corporation.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/rfkill.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
struct rfkill_gpio_data {
const char *name;
enum rfkill_type type;
struct gpio_desc *reset_gpio;
struct gpio_desc *shutdown_gpio;
struct rfkill *rfkill_dev;
struct clk *clk;
bool clk_enabled;
};
static int rfkill_gpio_set_power(void *data, bool blocked)
{
struct rfkill_gpio_data *rfkill = data;
if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
clk_enable(rfkill->clk);
gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
clk_disable(rfkill->clk);
rfkill->clk_enabled = !blocked;
return 0;
}
static const struct rfkill_ops rfkill_gpio_ops = {
.set_block = rfkill_gpio_set_power,
};
static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
{ "reset-gpios", &reset_gpios, 1 },
{ "shutdown-gpios", &shutdown_gpios, 1 },
{ },
};
static int rfkill_gpio_acpi_probe(struct device *dev,
struct rfkill_gpio_data *rfkill)
{
const struct acpi_device_id *id;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return -ENODEV;
rfkill->type = (unsigned)id->driver_data;
return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios);
}
static int rfkill_gpio_probe(struct platform_device *pdev)
{
struct rfkill_gpio_data *rfkill;
struct gpio_desc *gpio;
const char *type_name;
int ret;
rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
if (!rfkill)
return -ENOMEM;
device_property_read_string(&pdev->dev, "name", &rfkill->name);
device_property_read_string(&pdev->dev, "type", &type_name);
if (!rfkill->name)
rfkill->name = dev_name(&pdev->dev);
rfkill->type = rfkill_find_type(type_name);
if (ACPI_HANDLE(&pdev->dev)) {
ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
if (ret)
return ret;
}
rfkill->clk = devm_clk_get(&pdev->dev, NULL);
gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
rfkill->reset_gpio = gpio;
gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
rfkill->shutdown_gpio = gpio;
/* Make sure at-least one GPIO is defined for this instance */
if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
dev_err(&pdev->dev, "invalid platform data\n");
return -EINVAL;
}
rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
rfkill->type, &rfkill_gpio_ops,
rfkill);
if (!rfkill->rfkill_dev)
return -ENOMEM;
ret = rfkill_register(rfkill->rfkill_dev);
if (ret < 0)
goto err_destroy;
platform_set_drvdata(pdev, rfkill);
dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
return 0;
err_destroy:
rfkill_destroy(rfkill->rfkill_dev);
return ret;
}
static int rfkill_gpio_remove(struct platform_device *pdev)
{
struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
rfkill_unregister(rfkill->rfkill_dev);
rfkill_destroy(rfkill->rfkill_dev);
return 0;
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id rfkill_acpi_match[] = {
{ "BCM4752", RFKILL_TYPE_GPS },
{ "LNV4752", RFKILL_TYPE_GPS },
{ },
};
MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
#endif
static struct platform_driver rfkill_gpio_driver = {
.probe = rfkill_gpio_probe,
.remove = rfkill_gpio_remove,
.driver = {
.name = "rfkill_gpio",
.acpi_match_table = ACPI_PTR(rfkill_acpi_match),
},
};
module_platform_driver(rfkill_gpio_driver);
MODULE_DESCRIPTION("gpio rfkill");
MODULE_AUTHOR("NVIDIA");
MODULE_LICENSE("GPL");