[deliverable/linux.git] / drivers / usb / phy / phy-gpio-vbus-usb.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;
	int			vbus;
	int			irq;
};


/*
 * 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_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, vbus;

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

	vbus = is_vbus_powered(pdata);
	if ((vbus ^ gpio_vbus->vbus) == 0)
		return;
	gpio_vbus->vbus = vbus;

	/* 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 (vbus) {
		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;

	gpio_vbus = container_of(otg->phy, struct gpio_vbus_data, phy);
	pdev = to_platform_device(gpio_vbus->dev);
	pdata = gpio_vbus->dev->platform_data;
	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->vbus = 0; /* start with disconnected */
	gpio_vbus_irq(gpio_vbus->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;
	unsigned long irqflags;

	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;
		irqflags = (res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
	} else {
		irq = gpio_to_irq(gpio);
		irqflags = VBUS_IRQ_FLAGS;
	}

	gpio_vbus->irq = irq;

	/* 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, irqflags, "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_add_phy(&gpio_vbus->phy, USB_PHY_TYPE_USB2);
	if (err) {
		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
			err);
		goto err_otg;
	}

	device_init_wakeup(&pdev->dev, pdata->wakeup);

	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;

	device_init_wakeup(&pdev->dev, 0);
	cancel_delayed_work_sync(&gpio_vbus->work);
	regulator_put(gpio_vbus->vbus_draw);

	usb_remove_phy(&gpio_vbus->phy);

	free_irq(gpio_vbus->irq, 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;
}

#ifdef CONFIG_PM
static int gpio_vbus_pm_suspend(struct device *dev)
{
	struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		enable_irq_wake(gpio_vbus->irq);

	return 0;
}

static int gpio_vbus_pm_resume(struct device *dev)
{
	struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
		disable_irq_wake(gpio_vbus->irq);

	return 0;
}

static const struct dev_pm_ops gpio_vbus_dev_pm_ops = {
	.suspend	= gpio_vbus_pm_suspend,
	.resume		= gpio_vbus_pm_resume,
};
#endif

/* 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,
#ifdef CONFIG_PM
		.pm = &gpio_vbus_dev_pm_ops,
#endif
	},
	.remove  = __exit_p(gpio_vbus_remove),
};

module_platform_driver_probe(gpio_vbus_driver, gpio_vbus_probe);

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;
e44694e8	41	int vbus;
123bbcee	42	int irq;
6084f1bf PZ	43	};
	44
	45
	46	/*
	47	* This driver relies on "both edges" triggering. VBUS has 100 msec to
	48	* stabilize, so the peripheral controller driver may need to cope with
	49	* some bouncing due to current surges (e.g. charging local capacitance)
	50	* and contact chatter.
	51	*
	52	* REVISIT in desperate straits, toggling between rising and falling
	53	* edges might be workable.
	54	*/
	55	#define VBUS_IRQ_FLAGS \
da020b49	56	(IRQF_SHARED \| IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING)
6084f1bf PZ	57
	58
	59	/* interface to regulator framework */
	60	static void set_vbus_draw(struct gpio_vbus_data *gpio_vbus, unsigned mA)
	61	{
	62	struct regulator *vbus_draw = gpio_vbus->vbus_draw;
	63	int enabled;
	64
	65	if (!vbus_draw)
	66	return;
	67
	68	enabled = gpio_vbus->vbus_draw_enabled;
	69	if (mA) {
	70	regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
	71	if (!enabled) {
	72	regulator_enable(vbus_draw);
	73	gpio_vbus->vbus_draw_enabled = 1;
	74	}
	75	} else {
	76	if (enabled) {
	77	regulator_disable(vbus_draw);
	78	gpio_vbus->vbus_draw_enabled = 0;
	79	}
	80	}
	81	gpio_vbus->mA = mA;
	82	}
	83
c2344f13	84	static int is_vbus_powered(struct gpio_vbus_mach_info *pdata)
6084f1bf	85	{
c2344f13	86	int vbus;
6084f1bf PZ	87
	88	vbus = gpio_get_value(pdata->gpio_vbus);
	89	if (pdata->gpio_vbus_inverted)
	90	vbus = !vbus;
	91
c2344f13 RJ	92	return vbus;
	93	}
	94
	95	static void gpio_vbus_work(struct work_struct *work)
	96	{
	97	struct gpio_vbus_data *gpio_vbus =
934ccec4	98	container_of(work, struct gpio_vbus_data, work.work);
c2344f13	99	struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
e44694e8	100	int gpio, status, vbus;
6084f1bf	101
16bc1bb2	102	if (!gpio_vbus->phy.otg->gadget)
c2344f13	103	return;
6084f1bf	104
e44694e8 SK	105	vbus = is_vbus_powered(pdata);
	106	if ((vbus ^ gpio_vbus->vbus) == 0)
	107	return;
	108	gpio_vbus->vbus = vbus;
	109
6084f1bf PZ	110	/* Peripheral controllers which manage the pullup themselves won't have
	111	* gpio_pullup configured here. If it's configured here, we'll do what
	112	* isp1301_omap::b_peripheral() does and enable the pullup here... although
	113	* that may complicate usb_gadget_{,dis}connect() support.
	114	*/
	115	gpio = pdata->gpio_pullup;
e44694e8 SK	116
e44694e8 SK	117	if (vbus) {
662c738d	118	status = USB_EVENT_VBUS;
16bc1bb2	119	gpio_vbus->phy.state = OTG_STATE_B_PERIPHERAL;
662c738d	120	gpio_vbus->phy.last_event = status;
16bc1bb2	121	usb_gadget_vbus_connect(gpio_vbus->phy.otg->gadget);
6084f1bf PZ	122
	123	/* drawing a "unit load" is always OK, except for OTG */
	124	set_vbus_draw(gpio_vbus, 100);
	125
	126	/* optionally enable D+ pullup */
	127	if (gpio_is_valid(gpio))
	128	gpio_set_value(gpio, !pdata->gpio_pullup_inverted);
662c738d HS	129
	130	atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
	131	status, gpio_vbus->phy.otg->gadget);
6084f1bf PZ	132	} else {
	133	/* optionally disable D+ pullup */
	134	if (gpio_is_valid(gpio))
	135	gpio_set_value(gpio, pdata->gpio_pullup_inverted);
	136
	137	set_vbus_draw(gpio_vbus, 0);
	138
16bc1bb2	139	usb_gadget_vbus_disconnect(gpio_vbus->phy.otg->gadget);
662c738d	140	status = USB_EVENT_NONE;
16bc1bb2	141	gpio_vbus->phy.state = OTG_STATE_B_IDLE;
662c738d HS	142	gpio_vbus->phy.last_event = status;
	143
	144	atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
	145	status, gpio_vbus->phy.otg->gadget);
6084f1bf	146	}
c2344f13 RJ	147	}
	148
	149	/* VBUS change IRQ handler */
	150	static irqreturn_t gpio_vbus_irq(int irq, void *data)
	151	{
	152	struct platform_device *pdev = data;
	153	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	154	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
16bc1bb2	155	struct usb_otg *otg = gpio_vbus->phy.otg;
c2344f13 RJ	156
	157	dev_dbg(&pdev->dev, "VBUS %s (gadget: %s)\n",
	158	is_vbus_powered(pdata) ? "supplied" : "inactive",
16bc1bb2	159	otg->gadget ? otg->gadget->name : "none");
c2344f13	160
16bc1bb2	161	if (otg->gadget)
934ccec4	162	schedule_delayed_work(&gpio_vbus->work, msecs_to_jiffies(100));
6084f1bf PZ	163
	164	return IRQ_HANDLED;
	165	}
	166
	167	/* OTG transceiver interface */
	168
	169	/* bind/unbind the peripheral controller */
16bc1bb2 HK	170	static int gpio_vbus_set_peripheral(struct usb_otg *otg,
16bc1bb2 HK	171	struct usb_gadget *gadget)
6084f1bf PZ	172	{
	173	struct gpio_vbus_data *gpio_vbus;
	174	struct gpio_vbus_mach_info *pdata;
	175	struct platform_device *pdev;
123bbcee	176	int gpio;
6084f1bf	177
16bc1bb2	178	gpio_vbus = container_of(otg->phy, struct gpio_vbus_data, phy);
6084f1bf PZ	179	pdev = to_platform_device(gpio_vbus->dev);
6084f1bf PZ	180	pdata = gpio_vbus->dev->platform_data;
6084f1bf PZ	181	gpio = pdata->gpio_pullup;
	182
	183	if (!gadget) {
	184	dev_dbg(&pdev->dev, "unregistering gadget '%s'\n",
	185	otg->gadget->name);
	186
	187	/* optionally disable D+ pullup */
	188	if (gpio_is_valid(gpio))
	189	gpio_set_value(gpio, pdata->gpio_pullup_inverted);
	190
	191	set_vbus_draw(gpio_vbus, 0);
	192
	193	usb_gadget_vbus_disconnect(otg->gadget);
16bc1bb2	194	otg->phy->state = OTG_STATE_UNDEFINED;
6084f1bf PZ	195
	196	otg->gadget = NULL;
	197	return 0;
	198	}
	199
	200	otg->gadget = gadget;
	201	dev_dbg(&pdev->dev, "registered gadget '%s'\n", gadget->name);
	202
	203	/* initialize connection state */
e44694e8	204	gpio_vbus->vbus = 0; /* start with disconnected */
123bbcee	205	gpio_vbus_irq(gpio_vbus->irq, pdev);
6084f1bf PZ	206	return 0;
	207	}
	208
	209	/* effective for B devices, ignored for A-peripheral */
16bc1bb2	210	static int gpio_vbus_set_power(struct usb_phy *phy, unsigned mA)
6084f1bf PZ	211	{
	212	struct gpio_vbus_data *gpio_vbus;
	213
16bc1bb2	214	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);
6084f1bf	215
16bc1bb2	216	if (phy->state == OTG_STATE_B_PERIPHERAL)
6084f1bf PZ	217	set_vbus_draw(gpio_vbus, mA);
	218	return 0;
	219	}
	220
	221	/* for non-OTG B devices: set/clear transceiver suspend mode */
16bc1bb2	222	static int gpio_vbus_set_suspend(struct usb_phy *phy, int suspend)
6084f1bf PZ	223	{
	224	struct gpio_vbus_data *gpio_vbus;
	225
16bc1bb2	226	gpio_vbus = container_of(phy, struct gpio_vbus_data, phy);
6084f1bf PZ	227
	228	/* draw max 0 mA from vbus in suspend mode; or the previously
	229	* recorded amount of current if not suspended
	230	*
	231	* NOTE: high powered configs (mA > 100) may draw up to 2.5 mA
	232	* if they're wake-enabled ... we don't handle that yet.
	233	*/
16bc1bb2	234	return gpio_vbus_set_power(phy, suspend ? 0 : gpio_vbus->mA);
6084f1bf PZ	235	}
	236
	237	/* platform driver interface */
	238
	239	static int __init gpio_vbus_probe(struct platform_device *pdev)
	240	{
	241	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	242	struct gpio_vbus_data *gpio_vbus;
	243	struct resource *res;
	244	int err, gpio, irq;
c8240c1b	245	unsigned long irqflags;
6084f1bf PZ	246
	247	if (!pdata \|\| !gpio_is_valid(pdata->gpio_vbus))
	248	return -EINVAL;
	249	gpio = pdata->gpio_vbus;
	250
	251	gpio_vbus = kzalloc(sizeof(struct gpio_vbus_data), GFP_KERNEL);
	252	if (!gpio_vbus)
	253	return -ENOMEM;
	254
16bc1bb2 HK	255	gpio_vbus->phy.otg = kzalloc(sizeof(struct usb_otg), GFP_KERNEL);
	256	if (!gpio_vbus->phy.otg) {
	257	kfree(gpio_vbus);
	258	return -ENOMEM;
	259	}
	260
6084f1bf PZ	261	platform_set_drvdata(pdev, gpio_vbus);
6084f1bf PZ	262	gpio_vbus->dev = &pdev->dev;
16bc1bb2 HK	263	gpio_vbus->phy.label = "gpio-vbus";
	264	gpio_vbus->phy.set_power = gpio_vbus_set_power;
	265	gpio_vbus->phy.set_suspend = gpio_vbus_set_suspend;
	266	gpio_vbus->phy.state = OTG_STATE_UNDEFINED;
	267
	268	gpio_vbus->phy.otg->phy = &gpio_vbus->phy;
	269	gpio_vbus->phy.otg->set_peripheral = gpio_vbus_set_peripheral;
6084f1bf PZ	270
	271	err = gpio_request(gpio, "vbus_detect");
	272	if (err) {
	273	dev_err(&pdev->dev, "can't request vbus gpio %d, err: %d\n",
	274	gpio, err);
	275	goto err_gpio;
	276	}
	277	gpio_direction_input(gpio);
	278
	279	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	280	if (res) {
	281	irq = res->start;
c8240c1b SK	282	irqflags = (res->flags & IRQF_TRIGGER_MASK) \| IRQF_SHARED;
c8240c1b SK	283	} else {
6084f1bf	284	irq = gpio_to_irq(gpio);
c8240c1b SK	285	irqflags = VBUS_IRQ_FLAGS;
c8240c1b SK	286	}
6084f1bf	287
123bbcee SK	288	gpio_vbus->irq = irq;
123bbcee SK	289
6084f1bf PZ	290	/* if data line pullup is in use, initialize it to "not pulling up" */
	291	gpio = pdata->gpio_pullup;
	292	if (gpio_is_valid(gpio)) {
	293	err = gpio_request(gpio, "udc_pullup");
	294	if (err) {
	295	dev_err(&pdev->dev,
	296	"can't request pullup gpio %d, err: %d\n",
	297	gpio, err);
	298	gpio_free(pdata->gpio_vbus);
	299	goto err_gpio;
	300	}
	301	gpio_direction_output(gpio, pdata->gpio_pullup_inverted);
	302	}
	303
c8240c1b	304	err = request_irq(irq, gpio_vbus_irq, irqflags, "vbus_detect", pdev);
6084f1bf PZ	305	if (err) {
	306	dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
	307	irq, err);
	308	goto err_irq;
	309	}
662c738d HS	310
	311	ATOMIC_INIT_NOTIFIER_HEAD(&gpio_vbus->phy.notifier);
	312
934ccec4	313	INIT_DELAYED_WORK(&gpio_vbus->work, gpio_vbus_work);
6084f1bf	314
2887ba9e DES	315	gpio_vbus->vbus_draw = regulator_get(&pdev->dev, "vbus_draw");
	316	if (IS_ERR(gpio_vbus->vbus_draw)) {
	317	dev_dbg(&pdev->dev, "can't get vbus_draw regulator, err: %ld\n",
	318	PTR_ERR(gpio_vbus->vbus_draw));
	319	gpio_vbus->vbus_draw = NULL;
	320	}
	321
6084f1bf	322	/* only active when a gadget is registered */
662dca54	323	err = usb_add_phy(&gpio_vbus->phy, USB_PHY_TYPE_USB2);
6084f1bf PZ	324	if (err) {
	325	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
	326	err);
	327	goto err_otg;
	328	}
	329
7cbb062a SK	330	device_init_wakeup(&pdev->dev, pdata->wakeup);
7cbb062a SK	331
6084f1bf PZ	332	return 0;
6084f1bf PZ	333	err_otg:
a6dc9cf7	334	regulator_put(gpio_vbus->vbus_draw);
0d13eebc	335	free_irq(irq, pdev);
6084f1bf PZ	336	err_irq:
	337	if (gpio_is_valid(pdata->gpio_pullup))
	338	gpio_free(pdata->gpio_pullup);
	339	gpio_free(pdata->gpio_vbus);
	340	err_gpio:
	341	platform_set_drvdata(pdev, NULL);
16bc1bb2	342	kfree(gpio_vbus->phy.otg);
6084f1bf PZ	343	kfree(gpio_vbus);
	344	return err;
	345	}
	346
	347	static int __exit gpio_vbus_remove(struct platform_device *pdev)
	348	{
	349	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
	350	struct gpio_vbus_mach_info *pdata = pdev->dev.platform_data;
	351	int gpio = pdata->gpio_vbus;
	352
7cbb062a	353	device_init_wakeup(&pdev->dev, 0);
ec1ac6e1	354	cancel_delayed_work_sync(&gpio_vbus->work);
6084f1bf PZ	355	regulator_put(gpio_vbus->vbus_draw);
6084f1bf PZ	356
662dca54	357	usb_remove_phy(&gpio_vbus->phy);
6084f1bf	358
123bbcee	359	free_irq(gpio_vbus->irq, pdev);
6084f1bf PZ	360	if (gpio_is_valid(pdata->gpio_pullup))
	361	gpio_free(pdata->gpio_pullup);
	362	gpio_free(gpio);
	363	platform_set_drvdata(pdev, NULL);
16bc1bb2	364	kfree(gpio_vbus->phy.otg);
6084f1bf PZ	365	kfree(gpio_vbus);
	366
	367	return 0;
	368	}
	369
7cbb062a SK	370	#ifdef CONFIG_PM
	371	static int gpio_vbus_pm_suspend(struct device *dev)
	372	{
	373	struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);
	374
	375	if (device_may_wakeup(dev))
	376	enable_irq_wake(gpio_vbus->irq);
	377
	378	return 0;
	379	}
	380
	381	static int gpio_vbus_pm_resume(struct device *dev)
	382	{
	383	struct gpio_vbus_data *gpio_vbus = dev_get_drvdata(dev);
	384
	385	if (device_may_wakeup(dev))
	386	disable_irq_wake(gpio_vbus->irq);
	387
	388	return 0;
	389	}
	390
	391	static const struct dev_pm_ops gpio_vbus_dev_pm_ops = {
	392	.suspend = gpio_vbus_pm_suspend,
	393	.resume = gpio_vbus_pm_resume,
	394	};
	395	#endif
	396
6084f1bf PZ	397	/* NOTE: the gpio-vbus device may NOT be hotplugged */
	398
	399	MODULE_ALIAS("platform:gpio-vbus");
	400
	401	static struct platform_driver gpio_vbus_driver = {
	402	.driver = {
	403	.name = "gpio-vbus",
	404	.owner = THIS_MODULE,
7cbb062a SK	405	#ifdef CONFIG_PM
	406	.pm = &gpio_vbus_dev_pm_ops,
	407	#endif
6084f1bf PZ	408	},
	409	.remove = __exit_p(gpio_vbus_remove),
	410	};
	411
52f7a82b	412	module_platform_driver_probe(gpio_vbus_driver, gpio_vbus_probe);
6084f1bf PZ	413
	414	MODULE_DESCRIPTION("simple GPIO controlled OTG transceiver driver");
	415	MODULE_AUTHOR("Philipp Zabel");
	416	MODULE_LICENSE("GPL");