/* * 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/gpio.h>#include <linux/init.h>#include <linux/kernel.h>#include <linux/module.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)		return ret; 	platform_set_drvdata(pdev, rfkill); 	dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); 	return 0;} 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_ACPIstatic 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");