mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Linus Walleij](/assets/img/avatar_default.png)
The legacy <linux/gpio.h> header is no longer in use by the rfkill driver, so drop this include. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
186 lines
4.6 KiB
C
186 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 2011, NVIDIA Corporation.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#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");
|