[deliverable/linux.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 work_struct	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);
	struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
	int gpio;

	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)) {
		gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL;
		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);
	} 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);
		gpio_vbus->phy.state = OTG_STATE_B_IDLE;
	}
}

/* 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_work(&gpio_vbus->work);

	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;
	}
	INIT_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:
	free_irq(irq, &pdev->dev);
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->dev);
	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;
c2344f13	40	struct work_struct 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 =
	97	container_of(work, struct gpio_vbus_data, work);
	98	struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
	99	int gpio;
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)) {
16bc1bb2 HK	111	gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL;
16bc1bb2 HK	112	usb_gadget_vbus_connect(gpio_vbus->phy.otg->gadget);
6084f1bf PZ	113
	114	/* drawing a "unit load" is always OK, except for OTG */
	115	set_vbus_draw(gpio_vbus, 100);
	116
	117	/* optionally enable D+ pullup */
	118	if (gpio_is_valid(gpio))
	119	gpio_set_value(gpio, !pdata->gpio_pullup_inverted);
	120	} else {
	121	/* optionally disable D+ pullup */
	122	if (gpio_is_valid(gpio))
	123	gpio_set_value(gpio, pdata->gpio_pullup_inverted);
	124
	125	set_vbus_draw(gpio_vbus, 0);
	126
16bc1bb2 HK	127	usb_gadget_vbus_disconnect(gpio_vbus->phy.otg->gadget);
16bc1bb2 HK	128	gpio_vbus->phy.state = OTG_STATE_B_IDLE;
6084f1bf	129	}
c2344f13 RJ	130	}
	131
	132	/* VBUS change IRQ handler */
	133	static irqreturn_t gpio_vbus_irq(int irq, void *data)
	134	{
	135	struct platform_device *pdev = data;
	136	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	137	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
16bc1bb2	138	struct usb_otg *otg = gpio_vbus->phy.otg;
c2344f13 RJ	139
	140	dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
	141	is_vbus_powered(pdata) ? "supplied" : "inactive",
16bc1bb2	142	otg->gadget ? otg->gadget->name : "none");
c2344f13	143
16bc1bb2	144	if (otg->gadget)
c2344f13	145	schedule_work(&gpio_vbus->work);
6084f1bf PZ	146
	147	return IRQ_HANDLED;
	148	}
	149
	150	/* OTG transceiver interface */
	151
	152	/* bind/unbind the peripheral controller */
16bc1bb2 HK	153	static int gpio_vbus_set_peripheral(struct usb_otg *otg,
16bc1bb2 HK	154	struct usb_gadget *gadget)
6084f1bf PZ	155	{
	156	struct gpio_vbus_data *gpio_vbus;
	157	struct gpio_vbus_mach_info *pdata;
	158	struct platform_device *pdev;
	159	int gpio, irq;
	160
16bc1bb2	161	gpio_vbus = container_of(otg->phy, struct gpio_vbus_data, phy);
6084f1bf PZ	162	pdev = to_platform_device(gpio_vbus->dev);
	163	pdata = gpio_vbus->dev->platform_data;
	164	irq = gpio_to_irq(pdata->gpio_vbus);
	165	gpio = pdata->gpio_pullup;
	166
	167	if (!gadget) {
	168	dev_dbg(&pdev->dev, "unregistering gadget '%s'\n",
	169	otg->gadget->name);
	170
	171	/* optionally disable D+ pullup */
	172	if (gpio_is_valid(gpio))
	173	gpio_set_value(gpio, pdata->gpio_pullup_inverted);
	174
	175	set_vbus_draw(gpio_vbus, 0);
	176
	177	usb_gadget_vbus_disconnect(otg->gadget);
16bc1bb2	178	otg->phy->state = OTG_STATE_UNDEFINED;
6084f1bf PZ	179
	180	otg->gadget = NULL;
	181	return 0;
	182	}
	183
	184	otg->gadget = gadget;
	185	dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name);
	186
	187	/* initialize connection state */
	188	gpio_vbus_irq(irq, pdev);
	189	return 0;
	190	}
	191
	192	/* effective for B devices, ignored for A-peripheral */
16bc1bb2	193	static int gpio_vbus_set_power(struct usb_phy *phy, unsigned mA)
6084f1bf PZ	194	{
	195	struct gpio_vbus_data *gpio_vbus;
	196
16bc1bb2	197	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);
6084f1bf	198
16bc1bb2	199	if (phy->state == OTG_STATE_B_PERIPHERAL)
6084f1bf PZ	200	set_vbus_draw(gpio_vbus, mA);
	201	return 0;
	202	}
	203
	204	/* for non-OTG B devices: set/clear transceiver suspend mode */
16bc1bb2	205	static int gpio_vbus_set_suspend(struct usb_phy *phy, int suspend)
6084f1bf PZ	206	{
	207	struct gpio_vbus_data *gpio_vbus;
	208
16bc1bb2	209	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);
6084f1bf PZ	210
	211	/* draw max 0 mA from vbus in suspend mode; or the previously
	212	* recorded amount of current if not suspended
	213	*
	214	* NOTE: high powered configs (mA > 100) may draw up to 2.5 mA
	215	* if they're wake-enabled ... we don't handle that yet.
	216	*/
16bc1bb2	217	return gpio_vbus_set_power(phy, suspend ? 0 : gpio_vbus->mA);
6084f1bf PZ	218	}
	219
	220	/* platform driver interface */
	221
	222	static int __init gpio_vbus_probe(struct platform_device *pdev)
	223	{
	224	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	225	struct gpio_vbus_data *gpio_vbus;
	226	struct resource *res;
	227	int err, gpio, irq;
	228
	229	if (!pdata \|\| !gpio_is_valid(pdata->gpio_vbus))
	230	return -EINVAL;
	231	gpio = pdata->gpio_vbus;
	232
	233	gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL);
	234	if (!gpio_vbus)
	235	return -ENOMEM;
	236
16bc1bb2 HK	237	gpio_vbus->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
	238	if (!gpio_vbus->phy.otg) {
	239	kfree(gpio_vbus);
	240	return -ENOMEM;
	241	}
	242
6084f1bf PZ	243	platform_set_drvdata(pdev, gpio_vbus);
6084f1bf PZ	244	gpio_vbus->dev = &pdev->dev;
16bc1bb2 HK	245	gpio_vbus->phy.label = "gpio-vbus";
	246	gpio_vbus->phy.set_power = gpio_vbus_set_power;
	247	gpio_vbus->phy.set_suspend = gpio_vbus_set_suspend;
	248	gpio_vbus->phy.state = OTG_STATE_UNDEFINED;
	249
	250	gpio_vbus->phy.otg->phy = &gpio_vbus->phy;
	251	gpio_vbus->phy.otg->set_peripheral = gpio_vbus_set_peripheral;
6084f1bf PZ	252
	253	err = gpio_request(gpio, "vbus_detect");
	254	if (err) {
	255	dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n",
	256	gpio, err);
	257	goto err_gpio;
	258	}
	259	gpio_direction_input(gpio);
	260
	261	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	262	if (res) {
	263	irq = res->start;
	264	res->flags &= IRQF_TRIGGER_MASK;
	265	res->flags \|= IRQF_SAMPLE_RANDOM \| IRQF_SHARED;
	266	} else
	267	irq = gpio_to_irq(gpio);
	268
	269	/* if data line pullup is in use, initialize it to "not pulling up" */
	270	gpio = pdata->gpio_pullup;
	271	if (gpio_is_valid(gpio)) {
	272	err = gpio_request(gpio, "udc_pullup");
	273	if (err) {
	274	dev_err(&pdev->dev,
	275	"can't request pullup gpio %d, err: %d\n",
	276	gpio, err);
	277	gpio_free(pdata->gpio_vbus);
	278	goto err_gpio;
	279	}
	280	gpio_direction_output(gpio, pdata->gpio_pullup_inverted);
	281	}
	282
	283	err = request_irq(irq, gpio_vbus_irq, VBUS_IRQ_FLAGS,
	284	"vbus_detect", pdev);
	285	if (err) {
	286	dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
	287	irq, err);
	288	goto err_irq;
	289	}
c2344f13	290	INIT_WORK(&gpio_vbus->work, gpio_vbus_work);
6084f1bf	291
2887ba9e DES	292	gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");
	293	if (IS_ERR(gpio_vbus->vbus_draw)) {
	294	dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n",
	295	PTR_ERR(gpio_vbus->vbus_draw));
	296	gpio_vbus->vbus_draw = NULL;
	297	}
	298
6084f1bf	299	/* only active when a gadget is registered */
16bc1bb2	300	err = usb_set_transceiver(&gpio_vbus->phy);
6084f1bf PZ	301	if (err) {
	302	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
	303	err);
	304	goto err_otg;
	305	}
	306
6084f1bf PZ	307	return 0;
	308	err_otg:
	309	free_irq(irq, &pdev->dev);
	310	err_irq:
	311	if (gpio_is_valid(pdata->gpio_pullup))
	312	gpio_free(pdata->gpio_pullup);
	313	gpio_free(pdata->gpio_vbus);
	314	err_gpio:
	315	platform_set_drvdata(pdev, NULL);
16bc1bb2	316	kfree(gpio_vbus->phy.otg);
6084f1bf PZ	317	kfree(gpio_vbus);
	318	return err;
	319	}
	320
	321	static int __exit gpio_vbus_remove(struct platform_device *pdev)
	322	{
	323	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
	324	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	325	int gpio = pdata->gpio_vbus;
	326
	327	regulator_put(gpio_vbus->vbus_draw);
	328
16bc1bb2	329	usb_set_transceiver(NULL);
6084f1bf PZ	330
	331	free_irq(gpio_to_irq(gpio), &pdev->dev);
	332	if (gpio_is_valid(pdata->gpio_pullup))
	333	gpio_free(pdata->gpio_pullup);
	334	gpio_free(gpio);
	335	platform_set_drvdata(pdev, NULL);
16bc1bb2	336	kfree(gpio_vbus->phy.otg);
6084f1bf PZ	337	kfree(gpio_vbus);
	338
	339	return 0;
	340	}
	341
	342	/* NOTE: the gpio-vbus device may NOT be hotplugged */
	343
	344	MODULE_ALIAS("platform:gpio-vbus");
	345
	346	static struct platform_driver gpio_vbus_driver = {
	347	.driver = {
	348	.name = "gpio-vbus",
	349	.owner = THIS_MODULE,
	350	},
	351	.remove = __exit_p(gpio_vbus_remove),
	352	};
	353
	354	static int __init gpio_vbus_init(void)
	355	{
	356	return platform_driver_probe(&gpio_vbus_driver, gpio_vbus_probe);
	357	}
	358	module_init(gpio_vbus_init);
	359
	360	static void __exit gpio_vbus_exit(void)
	361	{
	362	platform_driver_unregister(&gpio_vbus_driver);
	363	}
	364	module_exit(gpio_vbus_exit);
	365
	366	MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver");
	367	MODULE_AUTHOR("Philipp Zabel");
	368	MODULE_LICENSE("GPL");