/* * 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/rfkill-gpio.h> enum rfkill_gpio_clk_state {	UNSPECIFIED = 0,	PWR_ENABLED,	PWR_DISABLED}; #define PWR_CLK_SET(_RF, _EN) \	((_RF)->pwr_clk_enabled = (!(_EN) ? PWR_ENABLED : PWR_DISABLED))#define PWR_CLK_ENABLED(_RF) ((_RF)->pwr_clk_enabled == PWR_ENABLED)#define PWR_CLK_DISABLED(_RF) ((_RF)->pwr_clk_enabled != PWR_ENABLED) struct rfkill_gpio_data {	struct rfkill_gpio_platform_data	*pdata;	struct rfkill				*rfkill_dev;	char					*reset_name;	char					*shutdown_name;	enum rfkill_gpio_clk_state		pwr_clk_enabled;	struct clk				*pwr_clk;}; static int rfkill_gpio_set_power(void *data, bool blocked){	struct rfkill_gpio_data *rfkill = data; 	if (blocked) {		if (gpio_is_valid(rfkill->pdata->shutdown_gpio))			gpio_direction_output(rfkill->pdata->shutdown_gpio, 0);		if (gpio_is_valid(rfkill->pdata->reset_gpio))			gpio_direction_output(rfkill->pdata->reset_gpio, 0);		if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))			clk_disable(rfkill->pwr_clk);	} else {		if (rfkill->pwr_clk && PWR_CLK_DISABLED(rfkill))			clk_enable(rfkill->pwr_clk);		if (gpio_is_valid(rfkill->pdata->reset_gpio))			gpio_direction_output(rfkill->pdata->reset_gpio, 1);		if (gpio_is_valid(rfkill->pdata->shutdown_gpio))			gpio_direction_output(rfkill->pdata->shutdown_gpio, 1);	} 	if (rfkill->pwr_clk)		PWR_CLK_SET(rfkill, blocked); 	return 0;} static const struct rfkill_ops rfkill_gpio_ops = {	.set_block = rfkill_gpio_set_power,}; static int rfkill_gpio_probe(struct platform_device *pdev){	struct rfkill_gpio_data *rfkill;	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;	int ret = 0;	int len = 0; 	if (!pdata) {		pr_warn("%s: No platform data specified\n", __func__);		return -EINVAL;	} 	/* make sure at-least one of the GPIO is defined and that	 * a name is specified for this instance */	if (!pdata->name || (!gpio_is_valid(pdata->reset_gpio) &&		!gpio_is_valid(pdata->shutdown_gpio))) {		pr_warn("%s: invalid platform data\n", __func__);		return -EINVAL;	} 	rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);	if (!rfkill)		return -ENOMEM; 	if (pdata->gpio_runtime_setup) {		ret = pdata->gpio_runtime_setup(pdev);		if (ret) {			pr_warn("%s: can't set up gpio\n", __func__);			return ret;		}	} 	rfkill->pdata = pdata; 	len = strlen(pdata->name);	rfkill->reset_name = kzalloc(len + 7, GFP_KERNEL);	if (!rfkill->reset_name) {		ret = -ENOMEM;		goto fail_alloc;	} 	rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL);	if (!rfkill->shutdown_name) {		ret = -ENOMEM;		goto fail_reset_name;	} 	snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name);	snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name); 	if (pdata->power_clk_name) {		rfkill->pwr_clk = clk_get(&pdev->dev, pdata->power_clk_name);		if (IS_ERR(rfkill->pwr_clk)) {			pr_warn("%s: can't find pwr_clk.\n", __func__);			goto fail_shutdown_name;		}	} 	if (gpio_is_valid(pdata->reset_gpio)) {		ret = gpio_request(pdata->reset_gpio, rfkill->reset_name);		if (ret) {			pr_warn("%s: failed to get reset gpio.\n", __func__);			goto fail_clock;		}	} 	if (gpio_is_valid(pdata->shutdown_gpio)) {		ret = gpio_request(pdata->shutdown_gpio, rfkill->shutdown_name);		if (ret) {			pr_warn("%s: failed to get shutdown gpio.\n", __func__);			goto fail_reset;		}	} 	rfkill->rfkill_dev = rfkill_alloc(pdata->name, &pdev->dev, pdata->type,				&rfkill_gpio_ops, rfkill);	if (!rfkill->rfkill_dev)		goto fail_shutdown; 	ret = rfkill_register(rfkill->rfkill_dev);	if (ret < 0)		goto fail_rfkill; 	platform_set_drvdata(pdev, rfkill); 	dev_info(&pdev->dev, "%s device registered.\n", pdata->name); 	return 0; fail_rfkill:	rfkill_destroy(rfkill->rfkill_dev);fail_shutdown:	if (gpio_is_valid(pdata->shutdown_gpio))		gpio_free(pdata->shutdown_gpio);fail_reset:	if (gpio_is_valid(pdata->reset_gpio))		gpio_free(pdata->reset_gpio);fail_clock:	if (rfkill->pwr_clk)		clk_put(rfkill->pwr_clk);fail_shutdown_name:	kfree(rfkill->shutdown_name);fail_reset_name:	kfree(rfkill->reset_name);fail_alloc:	kfree(rfkill); 	return ret;} static int rfkill_gpio_remove(struct platform_device *pdev){	struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data; 	if (pdata->gpio_runtime_close)		pdata->gpio_runtime_close(pdev);	rfkill_unregister(rfkill->rfkill_dev);	rfkill_destroy(rfkill->rfkill_dev);	if (gpio_is_valid(rfkill->pdata->shutdown_gpio))		gpio_free(rfkill->pdata->shutdown_gpio);	if (gpio_is_valid(rfkill->pdata->reset_gpio))		gpio_free(rfkill->pdata->reset_gpio);	if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))		clk_disable(rfkill->pwr_clk);	if (rfkill->pwr_clk)		clk_put(rfkill->pwr_clk);	kfree(rfkill->shutdown_name);	kfree(rfkill->reset_name);	kfree(rfkill); 	return 0;} static struct platform_driver rfkill_gpio_driver = {	.probe = rfkill_gpio_probe,	.remove = __devexit_p(rfkill_gpio_remove),	.driver = {		   .name = "rfkill_gpio",		   .owner = THIS_MODULE,	},}; static int __init rfkill_gpio_init(void){	return platform_driver_register(&rfkill_gpio_driver);} static void __exit rfkill_gpio_exit(void){	platform_driver_unregister(&rfkill_gpio_driver);} module_init(rfkill_gpio_init);module_exit(rfkill_gpio_exit); MODULE_DESCRIPTION("gpio rfkill");MODULE_AUTHOR("NVIDIA");MODULE_LICENSE("GPL");