[mirror_ubuntu-zesty-kernel.git] / drivers / usb / otg / gpio_vbus.c

/*
 * gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices
 *
 * Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.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.
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/workqueue.h>

#include <linux/regulator/consumer.h>

#include <linux/usb/gadget.h>
#include <linux/usb/gpio_vbus.h>
#include <linux/usb/otg.h>


/*
 * A simple GPIO VBUS sensing driver for B peripheral only devices
 * with internal transceivers. It can control a D+ pullup GPIO and
 * a regulator to limit the current drawn from VBUS.
 *
 * Needs to be loaded before the UDC driver that will use it.
 */
struct gpio_vbus_data {
	struct usb_phy		phy;
	struct device          *dev;
	struct regulator       *vbus_draw;
	int			vbus_draw_enabled;
	unsigned		mA;
	struct delayed_work	work;
};


/*
 * This driver relies on "both edges" triggering.  VBUS has 100 msec to
 * stabilize, so the peripheral controller driver may need to cope with
 * some bouncing due to current surges (e.g. charging local capacitance)
 * and contact chatter.
 *
 * REVISIT in desperate straits, toggling between rising and falling
 * edges might be workable.
 */
#define VBUS_IRQ_FLAGS \
	( IRQF_SAMPLE_RANDOM | IRQF_SHARED \
	| IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING )


/* interface to regulator framework */
static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA)
{
	struct regulator *vbus_draw = gpio_vbus->vbus_draw;
	int enabled;

	if (!vbus_draw)
		return;

	enabled = gpio_vbus->vbus_draw_enabled;
	if (mA) {
		regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
		if (!enabled) {
			regulator_enable(vbus_draw);
			gpio_vbus->vbus_draw_enabled = 1;
		}
	} else {
		if (enabled) {
			regulator_disable(vbus_draw);
			gpio_vbus->vbus_draw_enabled = 0;
		}
	}
	gpio_vbus->mA = mA;
}

static int is_vbus_powered(struct gpio_vbus_mach_info *pdata)
{
	int vbus;

	vbus = gpio_get_value(pdata->gpio_vbus);
	if (pdata->gpio_vbus_inverted)
		vbus = !vbus;

	return vbus;
}

static void gpio_vbus_work(struct work_struct *work)
{
	struct gpio_vbus_data *gpio_vbus =
		container_of(work, struct gpio_vbus_data, work.work);
	struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
	int gpio, status;

	if (!gpio_vbus->phy.otg->gadget)
		return;

	/* Peripheral controllers which manage the pullup themselves won't have
	 * gpio_pullup configured here.  If it's configured here, we'll do what
	 * isp1301_omap::b_peripheral() does and enable the pullup here... although
	 * that may complicate usb_gadget_{,dis}connect() support.
	 */
	gpio = pdata->gpio_pullup;
	if (is_vbus_powered(pdata)) {
		status = USB_EVENT_VBUS;
		gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL;
		gpio_vbus->phy.last_event = status;
		usb_gadget_vbus_connect(gpio_vbus->phy.otg->gadget);

		/* drawing a "unit load" is *always* OK, except for OTG */
		set_vbus_draw(gpio_vbus, 100);

		/* optionally enable D+ pullup */
		if (gpio_is_valid(gpio))
			gpio_set_value(gpio, !pdata->gpio_pullup_inverted);

		atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
					   status, gpio_vbus->phy.otg->gadget);
	} else {
		/* optionally disable D+ pullup */
		if (gpio_is_valid(gpio))
			gpio_set_value(gpio, pdata->gpio_pullup_inverted);

		set_vbus_draw(gpio_vbus, 0);

		usb_gadget_vbus_disconnect(gpio_vbus->phy.otg->gadget);
		status = USB_EVENT_NONE;
		gpio_vbus->phy.state = OTG_STATE_B_IDLE;
		gpio_vbus->phy.last_event = status;

		atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
					   status, gpio_vbus->phy.otg->gadget);
	}
}

/* VBUS change IRQ handler */
static irqreturn_t gpio_vbus_irq(int irq, void *data)
{
	struct platform_device *pdev = data;
	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
	struct usb_otg *otg = gpio_vbus->phy.otg;

	dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
		is_vbus_powered(pdata) ? "supplied" : "inactive",
		otg->gadget ? otg->gadget->name : "none");

	if (otg->gadget)
		schedule_delayed_work(&gpio_vbus->work, msecs_to_jiffies(100));

	return IRQ_HANDLED;
}

/* OTG transceiver interface */

/* bind/unbind the peripheral controller */
static int gpio_vbus_set_peripheral(struct usb_otg *otg,
					struct usb_gadget *gadget)
{
	struct gpio_vbus_data *gpio_vbus;
	struct gpio_vbus_mach_info *pdata;
	struct platform_device *pdev;
	int gpio, irq;

	gpio_vbus = container_of(otg->phy, struct gpio_vbus_data, phy);
	pdev = to_platform_device(gpio_vbus->dev);
	pdata = gpio_vbus->dev->platform_data;
	irq = gpio_to_irq(pdata->gpio_vbus);
	gpio = pdata->gpio_pullup;

	if (!gadget) {
		dev_dbg(&pdev->dev, "unregistering gadget '%s'\n",
			otg->gadget->name);

		/* optionally disable D+ pullup */
		if (gpio_is_valid(gpio))
			gpio_set_value(gpio, pdata->gpio_pullup_inverted);

		set_vbus_draw(gpio_vbus, 0);

		usb_gadget_vbus_disconnect(otg->gadget);
		otg->phy->state = OTG_STATE_UNDEFINED;

		otg->gadget = NULL;
		return 0;
	}

	otg->gadget = gadget;
	dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name);

	/* initialize connection state */
	gpio_vbus_irq(irq, pdev);
	return 0;
}

/* effective for B devices, ignored for A-peripheral */
static int gpio_vbus_set_power(struct usb_phy *phy, unsigned mA)
{
	struct gpio_vbus_data *gpio_vbus;

	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);

	if (phy->state == OTG_STATE_B_PERIPHERAL)
		set_vbus_draw(gpio_vbus, mA);
	return 0;
}

/* for non-OTG B devices: set/clear transceiver suspend mode */
static int gpio_vbus_set_suspend(struct usb_phy *phy, int suspend)
{
	struct gpio_vbus_data *gpio_vbus;

	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);

	/* draw max 0 mA from vbus in suspend mode; or the previously
	 * recorded amount of current if not suspended
	 *
	 * NOTE: high powered configs (mA > 100) may draw up to 2.5 mA
	 * if they're wake-enabled ... we don't handle that yet.
	 */
	return gpio_vbus_set_power(phy, suspend ? 0 : gpio_vbus->mA);
}

/* platform driver interface */

static int __init gpio_vbus_probe(struct platform_device *pdev)
{
	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	struct gpio_vbus_data *gpio_vbus;
	struct resource *res;
	int err, gpio, irq;

	if (!pdata || !gpio_is_valid(pdata->gpio_vbus))
		return -EINVAL;
	gpio = pdata->gpio_vbus;

	gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL);
	if (!gpio_vbus)
		return -ENOMEM;

	gpio_vbus->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
	if (!gpio_vbus->phy.otg) {
		kfree(gpio_vbus);
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, gpio_vbus);
	gpio_vbus->dev = &pdev->dev;
	gpio_vbus->phy.label = "gpio-vbus";
	gpio_vbus->phy.set_power = gpio_vbus_set_power;
	gpio_vbus->phy.set_suspend = gpio_vbus_set_suspend;
	gpio_vbus->phy.state = OTG_STATE_UNDEFINED;

	gpio_vbus->phy.otg->phy = &gpio_vbus->phy;
	gpio_vbus->phy.otg->set_peripheral = gpio_vbus_set_peripheral;

	err = gpio_request(gpio, "vbus_detect");
	if (err) {
		dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n",
			gpio, err);
		goto err_gpio;
	}
	gpio_direction_input(gpio);

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res) {
		irq = res->start;
		res->flags &= IRQF_TRIGGER_MASK;
		res->flags |= IRQF_SAMPLE_RANDOM | IRQF_SHARED;
	} else
		irq = gpio_to_irq(gpio);

	/* if data line pullup is in use, initialize it to "not pulling up" */
	gpio = pdata->gpio_pullup;
	if (gpio_is_valid(gpio)) {
		err = gpio_request(gpio, "udc_pullup");
		if (err) {
			dev_err(&pdev->dev,
				"can't request pullup gpio %d, err: %d\n",
				gpio, err);
			gpio_free(pdata->gpio_vbus);
			goto err_gpio;
		}
		gpio_direction_output(gpio, pdata->gpio_pullup_inverted);
	}

	err = request_irq(irq, gpio_vbus_irq, VBUS_IRQ_FLAGS,
		"vbus_detect", pdev);
	if (err) {
		dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
			irq, err);
		goto err_irq;
	}

	ATOMIC_INIT_NOTIFIER_HEAD(&gpio_vbus->phy.notifier);

	INIT_DELAYED_WORK(&gpio_vbus->work, gpio_vbus_work);

	gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");
	if (IS_ERR(gpio_vbus->vbus_draw)) {
		dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n",
			PTR_ERR(gpio_vbus->vbus_draw));
		gpio_vbus->vbus_draw = NULL;
	}

	/* only active when a gadget is registered */
	err = usb_set_transceiver(&gpio_vbus->phy);
	if (err) {
		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
			err);
		goto err_otg;
	}

	return 0;
err_otg:
	regulator_put(gpio_vbus->vbus_draw);
	free_irq(irq, pdev);
err_irq:
	if (gpio_is_valid(pdata->gpio_pullup))
		gpio_free(pdata->gpio_pullup);
	gpio_free(pdata->gpio_vbus);
err_gpio:
	platform_set_drvdata(pdev, NULL);
	kfree(gpio_vbus->phy.otg);
	kfree(gpio_vbus);
	return err;
}

static int __exit gpio_vbus_remove(struct platform_device *pdev)
{
	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	int gpio = pdata->gpio_vbus;

	regulator_put(gpio_vbus->vbus_draw);

	usb_set_transceiver(NULL);

	free_irq(gpio_to_irq(gpio), pdev);
	if (gpio_is_valid(pdata->gpio_pullup))
		gpio_free(pdata->gpio_pullup);
	gpio_free(gpio);
	platform_set_drvdata(pdev, NULL);
	kfree(gpio_vbus->phy.otg);
	kfree(gpio_vbus);

	return 0;
}

/* NOTE:  the gpio-vbus device may *NOT* be hotplugged */

MODULE_ALIAS("platform:gpio-vbus");

static struct platform_driver gpio_vbus_driver = {
	.driver = {
		.name  = "gpio-vbus",
		.owner = THIS_MODULE,
	},
	.remove  = __exit_p(gpio_vbus_remove),
};

static int __init gpio_vbus_init(void)
{
	return platform_driver_probe(&gpio_vbus_driver, gpio_vbus_probe);
}
module_init(gpio_vbus_init);

static void __exit gpio_vbus_exit(void)
{
	platform_driver_unregister(&gpio_vbus_driver);
}
module_exit(gpio_vbus_exit);

MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver");
MODULE_AUTHOR("Philipp Zabel");
MODULE_LICENSE("GPL");
Commit	Line	Data
6084f1bf PZ	1	/*
	2	* gpio-vbus.c - simple GPIO VBUS sensing driver for B peripheral devices
	3	*
	4	* Copyright (c) 2008 Philipp Zabel <philipp.zabel@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/gpio.h>
6eb0de82	14	#include <linux/module.h>
5a0e3ad6	15	#include <linux/slab.h>
6084f1bf PZ	16	#include <linux/interrupt.h>
6084f1bf PZ	17	#include <linux/usb.h>
c2344f13	18	#include <linux/workqueue.h>
6084f1bf PZ	19
	20	#include <linux/regulator/consumer.h>
	21
	22	#include <linux/usb/gadget.h>
	23	#include <linux/usb/gpio_vbus.h>
	24	#include <linux/usb/otg.h>
	25
	26
	27	/*
	28	* A simple GPIO VBUS sensing driver for B peripheral only devices
	29	* with internal transceivers. It can control a D+ pullup GPIO and
	30	* a regulator to limit the current drawn from VBUS.
	31	*
	32	* Needs to be loaded before the UDC driver that will use it.
	33	*/
	34	struct gpio_vbus_data {
16bc1bb2	35	struct usb_phy phy;
6084f1bf PZ	36	struct device *dev;
	37	struct regulator *vbus_draw;
	38	int vbus_draw_enabled;
	39	unsigned mA;
934ccec4	40	struct delayed_work work;
6084f1bf PZ	41	};
	42
	43
	44	/*
	45	* This driver relies on "both edges" triggering. VBUS has 100 msec to
	46	* stabilize, so the peripheral controller driver may need to cope with
	47	* some bouncing due to current surges (e.g. charging local capacitance)
	48	* and contact chatter.
	49	*
	50	* REVISIT in desperate straits, toggling between rising and falling
	51	* edges might be workable.
	52	*/
	53	#define VBUS_IRQ_FLAGS \
	54	( IRQF_SAMPLE_RANDOM \| IRQF_SHARED \
	55	\| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING )
	56
	57
	58	/* interface to regulator framework */
	59	static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA)
	60	{
	61	struct regulator *vbus_draw = gpio_vbus->vbus_draw;
	62	int enabled;
	63
	64	if (!vbus_draw)
	65	return;
	66
	67	enabled = gpio_vbus->vbus_draw_enabled;
	68	if (mA) {
	69	regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
	70	if (!enabled) {
	71	regulator_enable(vbus_draw);
	72	gpio_vbus->vbus_draw_enabled = 1;
	73	}
	74	} else {
	75	if (enabled) {
	76	regulator_disable(vbus_draw);
	77	gpio_vbus->vbus_draw_enabled = 0;
	78	}
	79	}
	80	gpio_vbus->mA = mA;
	81	}
	82
c2344f13	83	static int is_vbus_powered(struct gpio_vbus_mach_info *pdata)
6084f1bf	84	{
c2344f13	85	int vbus;
6084f1bf PZ	86
	87	vbus = gpio_get_value(pdata->gpio_vbus);
	88	if (pdata->gpio_vbus_inverted)
	89	vbus = !vbus;
	90
c2344f13 RJ	91	return vbus;
	92	}
	93
	94	static void gpio_vbus_work(struct work_struct *work)
	95	{
	96	struct gpio_vbus_data *gpio_vbus =
934ccec4	97	container_of(work, struct gpio_vbus_data, work.work);
c2344f13	98	struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
662c738d	99	int gpio, status;
6084f1bf	100
16bc1bb2	101	if (!gpio_vbus->phy.otg->gadget)
c2344f13	102	return;
6084f1bf PZ	103
	104	/* Peripheral controllers which manage the pullup themselves won't have
	105	* gpio_pullup configured here. If it's configured here, we'll do what
	106	* isp1301_omap::b_peripheral() does and enable the pullup here... although
	107	* that may complicate usb_gadget_{,dis}connect() support.
	108	*/
	109	gpio = pdata->gpio_pullup;
c2344f13	110	if (is_vbus_powered(pdata)) {
662c738d	111	status = USB_EVENT_VBUS;
16bc1bb2	112	gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL;
662c738d	113	gpio_vbus->phy.last_event = status;
16bc1bb2	114	usb_gadget_vbus_connect(gpio_vbus->phy.otg->gadget);
6084f1bf PZ	115
	116	/* drawing a "unit load" is always OK, except for OTG */
	117	set_vbus_draw(gpio_vbus, 100);
	118
	119	/* optionally enable D+ pullup */
	120	if (gpio_is_valid(gpio))
	121	gpio_set_value(gpio, !pdata->gpio_pullup_inverted);
662c738d HS	122
	123	atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
	124	status, gpio_vbus->phy.otg->gadget);
6084f1bf PZ	125	} else {
	126	/* optionally disable D+ pullup */
	127	if (gpio_is_valid(gpio))
	128	gpio_set_value(gpio, pdata->gpio_pullup_inverted);
	129
	130	set_vbus_draw(gpio_vbus, 0);
	131
16bc1bb2	132	usb_gadget_vbus_disconnect(gpio_vbus->phy.otg->gadget);
662c738d	133	status = USB_EVENT_NONE;
16bc1bb2	134	gpio_vbus->phy.state = OTG_STATE_B_IDLE;
662c738d HS	135	gpio_vbus->phy.last_event = status;
	136
	137	atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
	138	status, gpio_vbus->phy.otg->gadget);
6084f1bf	139	}
c2344f13 RJ	140	}
	141
	142	/* VBUS change IRQ handler */
	143	static irqreturn_t gpio_vbus_irq(int irq, void *data)
	144	{
	145	struct platform_device *pdev = data;
	146	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	147	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
16bc1bb2	148	struct usb_otg *otg = gpio_vbus->phy.otg;
c2344f13 RJ	149
	150	dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
	151	is_vbus_powered(pdata) ? "supplied" : "inactive",
16bc1bb2	152	otg->gadget ? otg->gadget->name : "none");
c2344f13	153
16bc1bb2	154	if (otg->gadget)
934ccec4	155	schedule_delayed_work(&gpio_vbus->work, msecs_to_jiffies(100));
6084f1bf PZ	156
	157	return IRQ_HANDLED;
	158	}
	159
	160	/* OTG transceiver interface */
	161
	162	/* bind/unbind the peripheral controller */
16bc1bb2 HK	163	static int gpio_vbus_set_peripheral(struct usb_otg *otg,
16bc1bb2 HK	164	struct usb_gadget *gadget)
6084f1bf PZ	165	{
	166	struct gpio_vbus_data *gpio_vbus;
	167	struct gpio_vbus_mach_info *pdata;
	168	struct platform_device *pdev;
	169	int gpio, irq;
	170
16bc1bb2	171	gpio_vbus = container_of(otg->phy, struct gpio_vbus_data, phy);
6084f1bf PZ	172	pdev = to_platform_device(gpio_vbus->dev);
	173	pdata = gpio_vbus->dev->platform_data;
	174	irq = gpio_to_irq(pdata->gpio_vbus);
	175	gpio = pdata->gpio_pullup;
	176
	177	if (!gadget) {
	178	dev_dbg(&pdev->dev, "unregistering gadget '%s'\n",
	179	otg->gadget->name);
	180
	181	/* optionally disable D+ pullup */
	182	if (gpio_is_valid(gpio))
	183	gpio_set_value(gpio, pdata->gpio_pullup_inverted);
	184
	185	set_vbus_draw(gpio_vbus, 0);
	186
	187	usb_gadget_vbus_disconnect(otg->gadget);
16bc1bb2	188	otg->phy->state = OTG_STATE_UNDEFINED;
6084f1bf PZ	189
	190	otg->gadget = NULL;
	191	return 0;
	192	}
	193
	194	otg->gadget = gadget;
	195	dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name);
	196
	197	/* initialize connection state */
	198	gpio_vbus_irq(irq, pdev);
	199	return 0;
	200	}
	201
	202	/* effective for B devices, ignored for A-peripheral */
16bc1bb2	203	static int gpio_vbus_set_power(struct usb_phy *phy, unsigned mA)
6084f1bf PZ	204	{
	205	struct gpio_vbus_data *gpio_vbus;
	206
16bc1bb2	207	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);
6084f1bf	208
16bc1bb2	209	if (phy->state == OTG_STATE_B_PERIPHERAL)
6084f1bf PZ	210	set_vbus_draw(gpio_vbus, mA);
	211	return 0;
	212	}
	213
	214	/* for non-OTG B devices: set/clear transceiver suspend mode */
16bc1bb2	215	static int gpio_vbus_set_suspend(struct usb_phy *phy, int suspend)
6084f1bf PZ	216	{
	217	struct gpio_vbus_data *gpio_vbus;
	218
16bc1bb2	219	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);
6084f1bf PZ	220
	221	/* draw max 0 mA from vbus in suspend mode; or the previously
	222	* recorded amount of current if not suspended
	223	*
	224	* NOTE: high powered configs (mA > 100) may draw up to 2.5 mA
	225	* if they're wake-enabled ... we don't handle that yet.
	226	*/
16bc1bb2	227	return gpio_vbus_set_power(phy, suspend ? 0 : gpio_vbus->mA);
6084f1bf PZ	228	}
	229
	230	/* platform driver interface */
	231
	232	static int __init gpio_vbus_probe(struct platform_device *pdev)
	233	{
	234	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	235	struct gpio_vbus_data *gpio_vbus;
	236	struct resource *res;
	237	int err, gpio, irq;
	238
	239	if (!pdata \|\| !gpio_is_valid(pdata->gpio_vbus))
	240	return -EINVAL;
	241	gpio = pdata->gpio_vbus;
	242
	243	gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL);
	244	if (!gpio_vbus)
	245	return -ENOMEM;
	246
16bc1bb2 HK	247	gpio_vbus->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
	248	if (!gpio_vbus->phy.otg) {
	249	kfree(gpio_vbus);
	250	return -ENOMEM;
	251	}
	252
6084f1bf PZ	253	platform_set_drvdata(pdev, gpio_vbus);
6084f1bf PZ	254	gpio_vbus->dev = &pdev->dev;
16bc1bb2 HK	255	gpio_vbus->phy.label = "gpio-vbus";
	256	gpio_vbus->phy.set_power = gpio_vbus_set_power;
	257	gpio_vbus->phy.set_suspend = gpio_vbus_set_suspend;
	258	gpio_vbus->phy.state = OTG_STATE_UNDEFINED;
	259
	260	gpio_vbus->phy.otg->phy = &gpio_vbus->phy;
	261	gpio_vbus->phy.otg->set_peripheral = gpio_vbus_set_peripheral;
6084f1bf PZ	262
	263	err = gpio_request(gpio, "vbus_detect");
	264	if (err) {
	265	dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n",
	266	gpio, err);
	267	goto err_gpio;
	268	}
	269	gpio_direction_input(gpio);
	270
	271	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	272	if (res) {
	273	irq = res->start;
	274	res->flags &= IRQF_TRIGGER_MASK;
	275	res->flags \|= IRQF_SAMPLE_RANDOM \| IRQF_SHARED;
	276	} else
	277	irq = gpio_to_irq(gpio);
	278
	279	/* if data line pullup is in use, initialize it to "not pulling up" */
	280	gpio = pdata->gpio_pullup;
	281	if (gpio_is_valid(gpio)) {
	282	err = gpio_request(gpio, "udc_pullup");
	283	if (err) {
	284	dev_err(&pdev->dev,
	285	"can't request pullup gpio %d, err: %d\n",
	286	gpio, err);
	287	gpio_free(pdata->gpio_vbus);
	288	goto err_gpio;
	289	}
	290	gpio_direction_output(gpio, pdata->gpio_pullup_inverted);
	291	}
	292
	293	err = request_irq(irq, gpio_vbus_irq, VBUS_IRQ_FLAGS,
	294	"vbus_detect", pdev);
	295	if (err) {
	296	dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
	297	irq, err);
	298	goto err_irq;
	299	}
662c738d HS	300
	301	ATOMIC_INIT_NOTIFIER_HEAD(&gpio_vbus->phy.notifier);
	302
934ccec4	303	INIT_DELAYED_WORK(&gpio_vbus->work, gpio_vbus_work);
6084f1bf	304
2887ba9e DES	305	gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");
	306	if (IS_ERR(gpio_vbus->vbus_draw)) {
	307	dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n",
	308	PTR_ERR(gpio_vbus->vbus_draw));
	309	gpio_vbus->vbus_draw = NULL;
	310	}
	311
6084f1bf	312	/* only active when a gadget is registered */
16bc1bb2	313	err = usb_set_transceiver(&gpio_vbus->phy);
6084f1bf PZ	314	if (err) {
	315	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
	316	err);
	317	goto err_otg;
	318	}
	319
6084f1bf PZ	320	return 0;
6084f1bf PZ	321	err_otg:
a6dc9cf7	322	regulator_put(gpio_vbus->vbus_draw);
0d13eebc	323	free_irq(irq, pdev);
6084f1bf PZ	324	err_irq:
	325	if (gpio_is_valid(pdata->gpio_pullup))
	326	gpio_free(pdata->gpio_pullup);
	327	gpio_free(pdata->gpio_vbus);
	328	err_gpio:
	329	platform_set_drvdata(pdev, NULL);
16bc1bb2	330	kfree(gpio_vbus->phy.otg);
6084f1bf PZ	331	kfree(gpio_vbus);
	332	return err;
	333	}
	334
	335	static int __exit gpio_vbus_remove(struct platform_device *pdev)
	336	{
	337	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
	338	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	339	int gpio = pdata->gpio_vbus;
	340
	341	regulator_put(gpio_vbus->vbus_draw);
	342
16bc1bb2	343	usb_set_transceiver(NULL);
6084f1bf	344
0d13eebc	345	free_irq(gpio_to_irq(gpio), pdev);
6084f1bf PZ	346	if (gpio_is_valid(pdata->gpio_pullup))
	347	gpio_free(pdata->gpio_pullup);
	348	gpio_free(gpio);
	349	platform_set_drvdata(pdev, NULL);
16bc1bb2	350	kfree(gpio_vbus->phy.otg);
6084f1bf PZ	351	kfree(gpio_vbus);
	352
	353	return 0;
	354	}
	355
	356	/* NOTE: the gpio-vbus device may NOT be hotplugged */
	357
	358	MODULE_ALIAS("platform:gpio-vbus");
	359
	360	static struct platform_driver gpio_vbus_driver = {
	361	.driver = {
	362	.name = "gpio-vbus",
	363	.owner = THIS_MODULE,
	364	},
	365	.remove = __exit_p(gpio_vbus_remove),
	366	};
	367
	368	static int __init gpio_vbus_init(void)
	369	{
	370	return platform_driver_probe(&gpio_vbus_driver, gpio_vbus_probe);
	371	}
	372	module_init(gpio_vbus_init);
	373
	374	static void __exit gpio_vbus_exit(void)
	375	{
	376	platform_driver_unregister(&gpio_vbus_driver);
	377	}
	378	module_exit(gpio_vbus_exit);
	379
	380	MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver");
	381	MODULE_AUTHOR("Philipp Zabel");
	382	MODULE_LICENSE("GPL");