[deliverable/linux.git] / drivers / extcon / extcon-usb-gpio.c

/**
 * drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver
 *
 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
 * Author: Roger Quadros <rogerq@ti.com>
 *
 * 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.
 *
 * 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.
 */

#include <linux/extcon.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/pm_wakeirq.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#define USB_GPIO_DEBOUNCE_MS	20	/* ms */

struct usb_extcon_info {
	struct device *dev;
	struct extcon_dev *edev;

	struct gpio_desc *id_gpiod;
	int id_irq;

	unsigned long debounce_jiffies;
	struct delayed_work wq_detcable;
};

static const unsigned int usb_extcon_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static void usb_extcon_detect_cable(struct work_struct *work)
{
	int id;
	struct usb_extcon_info *info = container_of(to_delayed_work(work),
						    struct usb_extcon_info,
						    wq_detcable);

	/* check ID and update cable state */
	id = gpiod_get_value_cansleep(info->id_gpiod);
	if (id) {
		/*
		 * ID = 1 means USB HOST cable detached.
		 * As we don't have event for USB peripheral cable attached,
		 * we simulate USB peripheral attach here.
		 */
		extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, false);
		extcon_set_cable_state_(info->edev, EXTCON_USB, true);
	} else {
		/*
		 * ID = 0 means USB HOST cable attached.
		 * As we don't have event for USB peripheral cable detached,
		 * we simulate USB peripheral detach here.
		 */
		extcon_set_cable_state_(info->edev, EXTCON_USB, false);
		extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, true);
	}
}

static irqreturn_t usb_irq_handler(int irq, void *dev_id)
{
	struct usb_extcon_info *info = dev_id;

	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
			   info->debounce_jiffies);

	return IRQ_HANDLED;
}

static int usb_extcon_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct usb_extcon_info *info;
	int ret;

	if (!np)
		return -EINVAL;

	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->dev = dev;
	info->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
	if (IS_ERR(info->id_gpiod)) {
		dev_err(dev, "failed to get ID GPIO\n");
		return PTR_ERR(info->id_gpiod);
	}

	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
	if (IS_ERR(info->edev)) {
		dev_err(dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	ret = devm_extcon_dev_register(dev, info->edev);
	if (ret < 0) {
		dev_err(dev, "failed to register extcon device\n");
		return ret;
	}

	ret = gpiod_set_debounce(info->id_gpiod,
				 USB_GPIO_DEBOUNCE_MS * 1000);
	if (ret < 0)
		info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);

	INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);

	info->id_irq = gpiod_to_irq(info->id_gpiod);
	if (info->id_irq < 0) {
		dev_err(dev, "failed to get ID IRQ\n");
		return info->id_irq;
	}

	ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
					usb_irq_handler,
					IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					pdev->name, info);
	if (ret < 0) {
		dev_err(dev, "failed to request handler for ID IRQ\n");
		return ret;
	}

	platform_set_drvdata(pdev, info);
	device_init_wakeup(dev, true);
	dev_pm_set_wake_irq(dev, info->id_irq);

	/* Perform initial detection */
	usb_extcon_detect_cable(&info->wq_detcable.work);

	return 0;
}

static int usb_extcon_remove(struct platform_device *pdev)
{
	struct usb_extcon_info *info = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&info->wq_detcable);

	dev_pm_clear_wake_irq(&pdev->dev);
	device_init_wakeup(&pdev->dev, false);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int usb_extcon_suspend(struct device *dev)
{
	struct usb_extcon_info *info = dev_get_drvdata(dev);
	int ret = 0;

	/*
	 * We don't want to process any IRQs after this point
	 * as GPIOs used behind I2C subsystem might not be
	 * accessible until resume completes. So disable IRQ.
	 */
	disable_irq(info->id_irq);

	return ret;
}

static int usb_extcon_resume(struct device *dev)
{
	struct usb_extcon_info *info = dev_get_drvdata(dev);
	int ret = 0;

	enable_irq(info->id_irq);
	if (!device_may_wakeup(dev))
		queue_delayed_work(system_power_efficient_wq,
				   &info->wq_detcable, 0);

	return ret;
}
#endif

static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops,
			 usb_extcon_suspend, usb_extcon_resume);

static const struct of_device_id usb_extcon_dt_match[] = {
	{ .compatible = "linux,extcon-usb-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, usb_extcon_dt_match);

static const struct platform_device_id usb_extcon_platform_ids[] = {
	{ .name = "extcon-usb-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids);

static struct platform_driver usb_extcon_driver = {
	.probe		= usb_extcon_probe,
	.remove		= usb_extcon_remove,
	.driver		= {
		.name	= "extcon-usb-gpio",
		.pm	= &usb_extcon_pm_ops,
		.of_match_table = usb_extcon_dt_match,
	},
	.id_table = usb_extcon_platform_ids,
};

module_platform_driver(usb_extcon_driver);

MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
MODULE_DESCRIPTION("USB GPIO extcon driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e52817fa RQ	1	/**
	2	* drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver
	3	*
	4	* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
	5	* Author: Roger Quadros <rogerq@ti.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16
	17	#include <linux/extcon.h>
92b7cb5d	18	#include <linux/gpio.h>
638f958b	19	#include <linux/gpio/consumer.h>
e52817fa RQ	20	#include <linux/init.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/irq.h>
	23	#include <linux/kernel.h>
	24	#include <linux/module.h>
	25	#include <linux/of_gpio.h>
	26	#include <linux/platform_device.h>
12bd0f32	27	#include <linux/pm_wakeirq.h>
e52817fa RQ	28	#include <linux/slab.h>
	29	#include <linux/workqueue.h>
	30
	31	#define USB_GPIO_DEBOUNCE_MS 20 /* ms */
	32
	33	struct usb_extcon_info {
	34	struct device *dev;
	35	struct extcon_dev *edev;
	36
	37	struct gpio_desc *id_gpiod;
	38	int id_irq;
	39
	40	unsigned long debounce_jiffies;
	41	struct delayed_work wq_detcable;
	42	};
	43
73b6ecdb	44	static const unsigned int usb_extcon_cable[] = {
2a9de9c0 CC	45	EXTCON_USB,
	46	EXTCON_USB_HOST,
	47	EXTCON_NONE,
e52817fa RQ	48	};
	49
	50	static void usb_extcon_detect_cable(struct work_struct *work)
	51	{
	52	int id;
	53	struct usb_extcon_info *info = container_of(to_delayed_work(work),
	54	struct usb_extcon_info,
	55	wq_detcable);
	56
	57	/* check ID and update cable state */
	58	id = gpiod_get_value_cansleep(info->id_gpiod);
	59	if (id) {
	60	/*
	61	* ID = 1 means USB HOST cable detached.
	62	* As we don't have event for USB peripheral cable attached,
	63	* we simulate USB peripheral attach here.
	64	*/
2a9de9c0 CC	65	extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, false);
2a9de9c0 CC	66	extcon_set_cable_state_(info->edev, EXTCON_USB, true);
e52817fa RQ	67	} else {
	68	/*
	69	* ID = 0 means USB HOST cable attached.
	70	* As we don't have event for USB peripheral cable detached,
	71	* we simulate USB peripheral detach here.
	72	*/
2a9de9c0 CC	73	extcon_set_cable_state_(info->edev, EXTCON_USB, false);
2a9de9c0 CC	74	extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, true);
e52817fa RQ	75	}
	76	}
	77
	78	static irqreturn_t usb_irq_handler(int irq, void *dev_id)
	79	{
	80	struct usb_extcon_info *info = dev_id;
	81
	82	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
	83	info->debounce_jiffies);
	84
	85	return IRQ_HANDLED;
	86	}
	87
	88	static int usb_extcon_probe(struct platform_device *pdev)
	89	{
	90	struct device *dev = &pdev->dev;
	91	struct device_node *np = dev->of_node;
	92	struct usb_extcon_info *info;
	93	int ret;
	94
	95	if (!np)
	96	return -EINVAL;
	97
	98	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
	99	if (!info)
	100	return -ENOMEM;
	101
	102	info->dev = dev;
35eed7a0	103	info->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN);
e52817fa RQ	104	if (IS_ERR(info->id_gpiod)) {
	105	dev_err(dev, "failed to get ID GPIO\n");
	106	return PTR_ERR(info->id_gpiod);
	107	}
	108
bc1aabad RB	109	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
	110	if (IS_ERR(info->edev)) {
	111	dev_err(dev, "failed to allocate extcon device\n");
	112	return -ENOMEM;
	113	}
	114
	115	ret = devm_extcon_dev_register(dev, info->edev);
	116	if (ret < 0) {
	117	dev_err(dev, "failed to register extcon device\n");
	118	return ret;
	119	}
	120
e52817fa RQ	121	ret = gpiod_set_debounce(info->id_gpiod,
	122	USB_GPIO_DEBOUNCE_MS * 1000);
	123	if (ret < 0)
	124	info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS);
	125
	126	INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable);
	127
	128	info->id_irq = gpiod_to_irq(info->id_gpiod);
	129	if (info->id_irq < 0) {
	130	dev_err(dev, "failed to get ID IRQ\n");
	131	return info->id_irq;
	132	}
	133
	134	ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
	135	usb_irq_handler,
	136	IRQF_TRIGGER_RISING \|
	137	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	138	pdev->name, info);
	139	if (ret < 0) {
	140	dev_err(dev, "failed to request handler for ID IRQ\n");
	141	return ret;
	142	}
	143
e52817fa	144	platform_set_drvdata(pdev, info);
12bd0f32 GS	145	device_init_wakeup(dev, true);
12bd0f32 GS	146	dev_pm_set_wake_irq(dev, info->id_irq);
e52817fa RQ	147
	148	/* Perform initial detection */
	149	usb_extcon_detect_cable(&info->wq_detcable.work);
	150
	151	return 0;
	152	}
	153
	154	static int usb_extcon_remove(struct platform_device *pdev)
	155	{
	156	struct usb_extcon_info *info = platform_get_drvdata(pdev);
	157
	158	cancel_delayed_work_sync(&info->wq_detcable);
	159
12bd0f32 GS	160	dev_pm_clear_wake_irq(&pdev->dev);
	161	device_init_wakeup(&pdev->dev, false);
	162
e52817fa RQ	163	return 0;
	164	}
	165
	166	#ifdef CONFIG_PM_SLEEP
	167	static int usb_extcon_suspend(struct device *dev)
	168	{
	169	struct usb_extcon_info *info = dev_get_drvdata(dev);
	170	int ret = 0;
	171
e52817fa RQ	172	/*
	173	* We don't want to process any IRQs after this point
	174	* as GPIOs used behind I2C subsystem might not be
	175	* accessible until resume completes. So disable IRQ.
	176	*/
	177	disable_irq(info->id_irq);
	178
	179	return ret;
	180	}
	181
	182	static int usb_extcon_resume(struct device *dev)
	183	{
	184	struct usb_extcon_info *info = dev_get_drvdata(dev);
	185	int ret = 0;
	186
e52817fa	187	enable_irq(info->id_irq);
04c08008 RQ	188	if (!device_may_wakeup(dev))
	189	queue_delayed_work(system_power_efficient_wq,
	190	&info->wq_detcable, 0);
e52817fa RQ	191
	192	return ret;
	193	}
	194	#endif
	195
	196	static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops,
	197	usb_extcon_suspend, usb_extcon_resume);
	198
34825e51	199	static const struct of_device_id usb_extcon_dt_match[] = {
e52817fa RQ	200	{ .compatible = "linux,extcon-usb-gpio", },
	201	{ /* sentinel */ }
	202	};
	203	MODULE_DEVICE_TABLE(of, usb_extcon_dt_match);
	204
058b6659 LB	205	static const struct platform_device_id usb_extcon_platform_ids[] = {
	206	{ .name = "extcon-usb-gpio", },
	207	{ /* sentinel */ }
	208	};
	209	MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids);
	210
e52817fa RQ	211	static struct platform_driver usb_extcon_driver = {
	212	.probe = usb_extcon_probe,
	213	.remove = usb_extcon_remove,
	214	.driver = {
	215	.name = "extcon-usb-gpio",
	216	.pm = &usb_extcon_pm_ops,
	217	.of_match_table = usb_extcon_dt_match,
	218	},
058b6659	219	.id_table = usb_extcon_platform_ids,
e52817fa RQ	220	};
	221
	222	module_platform_driver(usb_extcon_driver);
	223
	224	MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
	225	MODULE_DESCRIPTION("USB GPIO extcon driver");
	226	MODULE_LICENSE("GPL v2");