[deliverable/linux.git] / drivers / usb / phy / phy-tahvo.c

/*
 * Tahvo USB transceiver driver
 *
 * Copyright (C) 2005-2006 Nokia Corporation
 *
 * Parts copied from isp1301_omap.c.
 * Copyright (C) 2004 Texas Instruments
 * Copyright (C) 2004 David Brownell
 *
 * Original driver written by Juha Yrjölä, Tony Lindgren and Timo Teräs.
 * Modified for Retu/Tahvo MFD by Aaro Koskinen.
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License. See the file "COPYING" in the main directory of this
 * archive for more details.
 *
 * 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/io.h>
#include <linux/clk.h>
#include <linux/usb.h>
#include <linux/extcon.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb/otg.h>
#include <linux/mfd/retu.h>
#include <linux/usb/gadget.h>
#include <linux/platform_device.h>

#define DRIVER_NAME     "tahvo-usb"

#define TAHVO_REG_IDSR	0x02
#define TAHVO_REG_USBR	0x06

#define USBR_SLAVE_CONTROL	(1 << 8)
#define USBR_VPPVIO_SW		(1 << 7)
#define USBR_SPEED		(1 << 6)
#define USBR_REGOUT		(1 << 5)
#define USBR_MASTER_SW2		(1 << 4)
#define USBR_MASTER_SW1		(1 << 3)
#define USBR_SLAVE_SW		(1 << 2)
#define USBR_NSUSPEND		(1 << 1)
#define USBR_SEMODE		(1 << 0)

#define TAHVO_MODE_HOST		0
#define TAHVO_MODE_PERIPHERAL	1

struct tahvo_usb {
	struct platform_device	*pt_dev;
	struct usb_phy		phy;
	int			vbus_state;
	struct mutex		serialize;
	struct clk		*ick;
	int			irq;
	int			tahvo_mode;
	struct extcon_dev	*extcon;
};

static const unsigned int tahvo_cable[] = {
	EXTCON_USB,
	EXTCON_USB_HOST,

	EXTCON_NONE,
};

static ssize_t vbus_state_show(struct device *device,
			       struct device_attribute *attr, char *buf)
{
	struct tahvo_usb *tu = dev_get_drvdata(device);
	return sprintf(buf, "%s\n", tu->vbus_state ? "on" : "off");
}
static DEVICE_ATTR(vbus, 0444, vbus_state_show, NULL);

static void check_vbus_state(struct tahvo_usb *tu)
{
	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	int reg, prev_state;

	reg = retu_read(rdev, TAHVO_REG_IDSR);
	if (reg & TAHVO_STAT_VBUS) {
		switch (tu->phy.otg->state) {
		case OTG_STATE_B_IDLE:
			/* Enable the gadget driver */
			if (tu->phy.otg->gadget)
				usb_gadget_vbus_connect(tu->phy.otg->gadget);
			tu->phy.otg->state = OTG_STATE_B_PERIPHERAL;
			usb_phy_set_event(&tu->phy, USB_EVENT_ENUMERATED);
			break;
		case OTG_STATE_A_IDLE:
			/*
			 * Session is now valid assuming the USB hub is driving
			 * Vbus.
			 */
			tu->phy.otg->state = OTG_STATE_A_HOST;
			break;
		default:
			break;
		}
		dev_info(&tu->pt_dev->dev, "USB cable connected\n");
	} else {
		switch (tu->phy.otg->state) {
		case OTG_STATE_B_PERIPHERAL:
			if (tu->phy.otg->gadget)
				usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
			tu->phy.otg->state = OTG_STATE_B_IDLE;
			usb_phy_set_event(&tu->phy, USB_EVENT_NONE);
			break;
		case OTG_STATE_A_HOST:
			tu->phy.otg->state = OTG_STATE_A_IDLE;
			break;
		default:
			break;
		}
		dev_info(&tu->pt_dev->dev, "USB cable disconnected\n");
	}

	prev_state = tu->vbus_state;
	tu->vbus_state = reg & TAHVO_STAT_VBUS;
	if (prev_state != tu->vbus_state) {
		extcon_set_cable_state_(tu->extcon, EXTCON_USB, tu->vbus_state);
		sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state");
	}
}

static void tahvo_usb_become_host(struct tahvo_usb *tu)
{
	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);

	extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST, true);

	/* Power up the transceiver in USB host mode */
	retu_write(rdev, TAHVO_REG_USBR, USBR_REGOUT | USBR_NSUSPEND |
		   USBR_MASTER_SW2 | USBR_MASTER_SW1);
	tu->phy.otg->state = OTG_STATE_A_IDLE;

	check_vbus_state(tu);
}

static void tahvo_usb_stop_host(struct tahvo_usb *tu)
{
	tu->phy.otg->state = OTG_STATE_A_IDLE;
}

static void tahvo_usb_become_peripheral(struct tahvo_usb *tu)
{
	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);

	extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST, false);

	/* Power up transceiver and set it in USB peripheral mode */
	retu_write(rdev, TAHVO_REG_USBR, USBR_SLAVE_CONTROL | USBR_REGOUT |
		   USBR_NSUSPEND | USBR_SLAVE_SW);
	tu->phy.otg->state = OTG_STATE_B_IDLE;

	check_vbus_state(tu);
}

static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu)
{
	if (tu->phy.otg->gadget)
		usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
	tu->phy.otg->state = OTG_STATE_B_IDLE;
}

static void tahvo_usb_power_off(struct tahvo_usb *tu)
{
	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);

	/* Disable gadget controller if any */
	if (tu->phy.otg->gadget)
		usb_gadget_vbus_disconnect(tu->phy.otg->gadget);

	/* Power off transceiver */
	retu_write(rdev, TAHVO_REG_USBR, 0);
	tu->phy.otg->state = OTG_STATE_UNDEFINED;
}

static int tahvo_usb_set_suspend(struct usb_phy *dev, int suspend)
{
	struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, phy);
	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	u16 w;

	dev_dbg(&tu->pt_dev->dev, "%s\n", __func__);

	w = retu_read(rdev, TAHVO_REG_USBR);
	if (suspend)
		w &= ~USBR_NSUSPEND;
	else
		w |= USBR_NSUSPEND;
	retu_write(rdev, TAHVO_REG_USBR, w);

	return 0;
}

static int tahvo_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
{
	struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb,
					    phy);

	dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, host);

	mutex_lock(&tu->serialize);

	if (host == NULL) {
		if (tu->tahvo_mode == TAHVO_MODE_HOST)
			tahvo_usb_power_off(tu);
		otg->host = NULL;
		mutex_unlock(&tu->serialize);
		return 0;
	}

	if (tu->tahvo_mode == TAHVO_MODE_HOST) {
		otg->host = NULL;
		tahvo_usb_become_host(tu);
	}

	otg->host = host;

	mutex_unlock(&tu->serialize);

	return 0;
}

static int tahvo_usb_set_peripheral(struct usb_otg *otg,
				    struct usb_gadget *gadget)
{
	struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb,
					    phy);

	dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, gadget);

	mutex_lock(&tu->serialize);

	if (!gadget) {
		if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
			tahvo_usb_power_off(tu);
		tu->phy.otg->gadget = NULL;
		mutex_unlock(&tu->serialize);
		return 0;
	}

	tu->phy.otg->gadget = gadget;
	if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
		tahvo_usb_become_peripheral(tu);

	mutex_unlock(&tu->serialize);

	return 0;
}

static irqreturn_t tahvo_usb_vbus_interrupt(int irq, void *_tu)
{
	struct tahvo_usb *tu = _tu;

	mutex_lock(&tu->serialize);
	check_vbus_state(tu);
	mutex_unlock(&tu->serialize);

	return IRQ_HANDLED;
}

static ssize_t otg_mode_show(struct device *device,
			     struct device_attribute *attr, char *buf)
{
	struct tahvo_usb *tu = dev_get_drvdata(device);

	switch (tu->tahvo_mode) {
	case TAHVO_MODE_HOST:
		return sprintf(buf, "host\n");
	case TAHVO_MODE_PERIPHERAL:
		return sprintf(buf, "peripheral\n");
	}

	return -EINVAL;
}

static ssize_t otg_mode_store(struct device *device,
			      struct device_attribute *attr,
			      const char *buf, size_t count)
{
	struct tahvo_usb *tu = dev_get_drvdata(device);
	int r;

	mutex_lock(&tu->serialize);
	if (count >= 4 && strncmp(buf, "host", 4) == 0) {
		if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
			tahvo_usb_stop_peripheral(tu);
		tu->tahvo_mode = TAHVO_MODE_HOST;
		if (tu->phy.otg->host) {
			dev_info(device, "HOST mode: host controller present\n");
			tahvo_usb_become_host(tu);
		} else {
			dev_info(device, "HOST mode: no host controller, powering off\n");
			tahvo_usb_power_off(tu);
		}
		r = strlen(buf);
	} else if (count >= 10 && strncmp(buf, "peripheral", 10) == 0) {
		if (tu->tahvo_mode == TAHVO_MODE_HOST)
			tahvo_usb_stop_host(tu);
		tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
		if (tu->phy.otg->gadget) {
			dev_info(device, "PERIPHERAL mode: gadget driver present\n");
			tahvo_usb_become_peripheral(tu);
		} else {
			dev_info(device, "PERIPHERAL mode: no gadget driver, powering off\n");
			tahvo_usb_power_off(tu);
		}
		r = strlen(buf);
	} else {
		r = -EINVAL;
	}
	mutex_unlock(&tu->serialize);

	return r;
}
static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store);

static struct attribute *tahvo_attributes[] = {
	&dev_attr_vbus.attr,
	&dev_attr_otg_mode.attr,
	NULL
};

static struct attribute_group tahvo_attr_group = {
	.attrs = tahvo_attributes,
};

static int tahvo_usb_probe(struct platform_device *pdev)
{
	struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
	struct tahvo_usb *tu;
	int ret;

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

	tu->phy.otg = devm_kzalloc(&pdev->dev, sizeof(*tu->phy.otg),
				   GFP_KERNEL);
	if (!tu->phy.otg)
		return -ENOMEM;

	tu->pt_dev = pdev;

	/* Default mode */
#ifdef CONFIG_TAHVO_USB_HOST_BY_DEFAULT
	tu->tahvo_mode = TAHVO_MODE_HOST;
#else
	tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
#endif

	mutex_init(&tu->serialize);

	tu->ick = devm_clk_get(&pdev->dev, "usb_l4_ick");
	if (!IS_ERR(tu->ick))
		clk_enable(tu->ick);

	/*
	 * Set initial state, so that we generate kevents only on state changes.
	 */
	tu->vbus_state = retu_read(rdev, TAHVO_REG_IDSR) & TAHVO_STAT_VBUS;

	tu->extcon = devm_extcon_dev_allocate(&pdev->dev, tahvo_cable);
	if (IS_ERR(tu->extcon)) {
		dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
		return -ENOMEM;
	}

	ret = devm_extcon_dev_register(&pdev->dev, tu->extcon);
	if (ret) {
		dev_err(&pdev->dev, "could not register extcon device: %d\n",
			ret);
		goto err_disable_clk;
	}

	/* Set the initial cable state. */
	extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST,
			       tu->tahvo_mode == TAHVO_MODE_HOST);
	extcon_set_cable_state_(tu->extcon, EXTCON_USB, tu->vbus_state);

	/* Create OTG interface */
	tahvo_usb_power_off(tu);
	tu->phy.dev = &pdev->dev;
	tu->phy.otg->state = OTG_STATE_UNDEFINED;
	tu->phy.label = DRIVER_NAME;
	tu->phy.set_suspend = tahvo_usb_set_suspend;

	tu->phy.otg->usb_phy = &tu->phy;
	tu->phy.otg->set_host = tahvo_usb_set_host;
	tu->phy.otg->set_peripheral = tahvo_usb_set_peripheral;

	ret = usb_add_phy(&tu->phy, USB_PHY_TYPE_USB2);
	if (ret < 0) {
		dev_err(&pdev->dev, "cannot register USB transceiver: %d\n",
			ret);
		goto err_disable_clk;
	}

	dev_set_drvdata(&pdev->dev, tu);

	tu->irq = platform_get_irq(pdev, 0);
	ret = request_threaded_irq(tu->irq, NULL, tahvo_usb_vbus_interrupt,
				   IRQF_ONESHOT,
				   "tahvo-vbus", tu);
	if (ret) {
		dev_err(&pdev->dev, "could not register tahvo-vbus irq: %d\n",
			ret);
		goto err_remove_phy;
	}

	/* Attributes */
	ret = sysfs_create_group(&pdev->dev.kobj, &tahvo_attr_group);
	if (ret) {
		dev_err(&pdev->dev, "cannot create sysfs group: %d\n", ret);
		goto err_free_irq;
	}

	return 0;

err_free_irq:
	free_irq(tu->irq, tu);
err_remove_phy:
	usb_remove_phy(&tu->phy);
err_disable_clk:
	if (!IS_ERR(tu->ick))
		clk_disable(tu->ick);

	return ret;
}

static int tahvo_usb_remove(struct platform_device *pdev)
{
	struct tahvo_usb *tu = platform_get_drvdata(pdev);

	sysfs_remove_group(&pdev->dev.kobj, &tahvo_attr_group);
	free_irq(tu->irq, tu);
	usb_remove_phy(&tu->phy);
	if (!IS_ERR(tu->ick))
		clk_disable(tu->ick);

	return 0;
}

static struct platform_driver tahvo_usb_driver = {
	.probe		= tahvo_usb_probe,
	.remove		= tahvo_usb_remove,
	.driver		= {
		.name	= "tahvo-usb",
	},
};
module_platform_driver(tahvo_usb_driver);

MODULE_DESCRIPTION("Tahvo USB transceiver driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");
MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");
Commit	Line	Data
9ba96ae5 AK	1	/*
	2	* Tahvo USB transceiver driver
	3	*
	4	* Copyright (C) 2005-2006 Nokia Corporation
	5	*
	6	* Parts copied from isp1301_omap.c.
	7	* Copyright (C) 2004 Texas Instruments
	8	* Copyright (C) 2004 David Brownell
	9	*
	10	* Original driver written by Juha Yrjölä, Tony Lindgren and Timo Teräs.
	11	* Modified for Retu/Tahvo MFD by Aaro Koskinen.
	12	*
	13	* This file is subject to the terms and conditions of the GNU General
	14	* Public License. See the file "COPYING" in the main directory of this
	15	* archive for more details.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*/
	22
	23	#include <linux/io.h>
	24	#include <linux/clk.h>
	25	#include <linux/usb.h>
	26	#include <linux/extcon.h>
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/usb/otg.h>
	30	#include <linux/mfd/retu.h>
	31	#include <linux/usb/gadget.h>
	32	#include <linux/platform_device.h>
	33
	34	#define DRIVER_NAME "tahvo-usb"
	35
	36	#define TAHVO_REG_IDSR 0x02
	37	#define TAHVO_REG_USBR 0x06
	38
	39	#define USBR_SLAVE_CONTROL (1 << 8)
	40	#define USBR_VPPVIO_SW (1 << 7)
	41	#define USBR_SPEED (1 << 6)
	42	#define USBR_REGOUT (1 << 5)
	43	#define USBR_MASTER_SW2 (1 << 4)
	44	#define USBR_MASTER_SW1 (1 << 3)
	45	#define USBR_SLAVE_SW (1 << 2)
	46	#define USBR_NSUSPEND (1 << 1)
	47	#define USBR_SEMODE (1 << 0)
	48
	49	#define TAHVO_MODE_HOST 0
	50	#define TAHVO_MODE_PERIPHERAL 1
	51
	52	struct tahvo_usb {
	53	struct platform_device *pt_dev;
	54	struct usb_phy phy;
	55	int vbus_state;
	56	struct mutex serialize;
	57	struct clk *ick;
	58	int irq;
	59	int tahvo_mode;
860d2686	60	struct extcon_dev *extcon;
9ba96ae5 AK	61	};
9ba96ae5 AK	62
73b6ecdb	63	static const unsigned int tahvo_cable[] = {
2a9de9c0 CC	64	EXTCON_USB,
	65	EXTCON_USB_HOST,
	66
	67	EXTCON_NONE,
9ba96ae5 AK	68	};
	69
	70	static ssize_t vbus_state_show(struct device *device,
	71	struct device_attribute attr, char buf)
	72	{
	73	struct tahvo_usb *tu = dev_get_drvdata(device);
	74	return sprintf(buf, "%s\n", tu->vbus_state ? "on" : "off");
	75	}
	76	static DEVICE_ATTR(vbus, 0444, vbus_state_show, NULL);
	77
	78	static void check_vbus_state(struct tahvo_usb *tu)
	79	{
	80	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	81	int reg, prev_state;
	82
	83	reg = retu_read(rdev, TAHVO_REG_IDSR);
	84	if (reg & TAHVO_STAT_VBUS) {
e47d9254	85	switch (tu->phy.otg->state) {
9ba96ae5 AK	86	case OTG_STATE_B_IDLE:
	87	/* Enable the gadget driver */
	88	if (tu->phy.otg->gadget)
	89	usb_gadget_vbus_connect(tu->phy.otg->gadget);
e47d9254	90	tu->phy.otg->state = OTG_STATE_B_PERIPHERAL;
b20f3f9e	91	usb_phy_set_event(&tu->phy, USB_EVENT_ENUMERATED);
9ba96ae5 AK	92	break;
	93	case OTG_STATE_A_IDLE:
	94	/*
	95	* Session is now valid assuming the USB hub is driving
	96	* Vbus.
	97	*/
e47d9254	98	tu->phy.otg->state = OTG_STATE_A_HOST;
9ba96ae5 AK	99	break;
	100	default:
	101	break;
	102	}
	103	dev_info(&tu->pt_dev->dev, "USB cable connected\n");
	104	} else {
e47d9254	105	switch (tu->phy.otg->state) {
9ba96ae5 AK	106	case OTG_STATE_B_PERIPHERAL:
	107	if (tu->phy.otg->gadget)
	108	usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
e47d9254	109	tu->phy.otg->state = OTG_STATE_B_IDLE;
b20f3f9e	110	usb_phy_set_event(&tu->phy, USB_EVENT_NONE);
9ba96ae5 AK	111	break;
9ba96ae5 AK	112	case OTG_STATE_A_HOST:
e47d9254	113	tu->phy.otg->state = OTG_STATE_A_IDLE;
9ba96ae5 AK	114	break;
	115	default:
	116	break;
	117	}
	118	dev_info(&tu->pt_dev->dev, "USB cable disconnected\n");
	119	}
	120
	121	prev_state = tu->vbus_state;
	122	tu->vbus_state = reg & TAHVO_STAT_VBUS;
	123	if (prev_state != tu->vbus_state) {
860d2686	124	extcon_set_cable_state_(tu->extcon, EXTCON_USB, tu->vbus_state);
9ba96ae5 AK	125	sysfs_notify(&tu->pt_dev->dev.kobj, NULL, "vbus_state");
	126	}
	127	}
	128
	129	static void tahvo_usb_become_host(struct tahvo_usb *tu)
	130	{
	131	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	132
860d2686	133	extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST, true);
9ba96ae5 AK	134
	135	/* Power up the transceiver in USB host mode */
	136	retu_write(rdev, TAHVO_REG_USBR, USBR_REGOUT \| USBR_NSUSPEND \|
	137	USBR_MASTER_SW2 \| USBR_MASTER_SW1);
e47d9254	138	tu->phy.otg->state = OTG_STATE_A_IDLE;
9ba96ae5 AK	139
	140	check_vbus_state(tu);
	141	}
	142
	143	static void tahvo_usb_stop_host(struct tahvo_usb *tu)
	144	{
e47d9254	145	tu->phy.otg->state = OTG_STATE_A_IDLE;
9ba96ae5 AK	146	}
	147
	148	static void tahvo_usb_become_peripheral(struct tahvo_usb *tu)
	149	{
	150	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	151
860d2686	152	extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST, false);
9ba96ae5 AK	153
	154	/* Power up transceiver and set it in USB peripheral mode */
	155	retu_write(rdev, TAHVO_REG_USBR, USBR_SLAVE_CONTROL \| USBR_REGOUT \|
	156	USBR_NSUSPEND \| USBR_SLAVE_SW);
e47d9254	157	tu->phy.otg->state = OTG_STATE_B_IDLE;
9ba96ae5 AK	158
	159	check_vbus_state(tu);
	160	}
	161
	162	static void tahvo_usb_stop_peripheral(struct tahvo_usb *tu)
	163	{
	164	if (tu->phy.otg->gadget)
	165	usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
e47d9254	166	tu->phy.otg->state = OTG_STATE_B_IDLE;
9ba96ae5 AK	167	}
	168
	169	static void tahvo_usb_power_off(struct tahvo_usb *tu)
	170	{
	171	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	172
	173	/* Disable gadget controller if any */
	174	if (tu->phy.otg->gadget)
	175	usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
	176
	177	/* Power off transceiver */
	178	retu_write(rdev, TAHVO_REG_USBR, 0);
e47d9254	179	tu->phy.otg->state = OTG_STATE_UNDEFINED;
9ba96ae5 AK	180	}
	181
	182	static int tahvo_usb_set_suspend(struct usb_phy *dev, int suspend)
	183	{
	184	struct tahvo_usb *tu = container_of(dev, struct tahvo_usb, phy);
	185	struct retu_dev *rdev = dev_get_drvdata(tu->pt_dev->dev.parent);
	186	u16 w;
	187
	188	dev_dbg(&tu->pt_dev->dev, "%s\n", __func__);
	189
	190	w = retu_read(rdev, TAHVO_REG_USBR);
	191	if (suspend)
	192	w &= ~USBR_NSUSPEND;
	193	else
	194	w \|= USBR_NSUSPEND;
	195	retu_write(rdev, TAHVO_REG_USBR, w);
	196
	197	return 0;
	198	}
	199
	200	static int tahvo_usb_set_host(struct usb_otg otg, struct usb_bus host)
	201	{
19c1eac2 AT	202	struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb,
19c1eac2 AT	203	phy);
9ba96ae5 AK	204
	205	dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, host);
	206
9ba96ae5 AK	207	mutex_lock(&tu->serialize);
	208
	209	if (host == NULL) {
	210	if (tu->tahvo_mode == TAHVO_MODE_HOST)
	211	tahvo_usb_power_off(tu);
	212	otg->host = NULL;
	213	mutex_unlock(&tu->serialize);
	214	return 0;
	215	}
	216
	217	if (tu->tahvo_mode == TAHVO_MODE_HOST) {
	218	otg->host = NULL;
	219	tahvo_usb_become_host(tu);
	220	}
	221
	222	otg->host = host;
	223
	224	mutex_unlock(&tu->serialize);
	225
	226	return 0;
	227	}
	228
	229	static int tahvo_usb_set_peripheral(struct usb_otg *otg,
	230	struct usb_gadget *gadget)
	231	{
19c1eac2 AT	232	struct tahvo_usb *tu = container_of(otg->usb_phy, struct tahvo_usb,
19c1eac2 AT	233	phy);
9ba96ae5 AK	234
	235	dev_dbg(&tu->pt_dev->dev, "%s %p\n", __func__, gadget);
	236
9ba96ae5 AK	237	mutex_lock(&tu->serialize);
	238
	239	if (!gadget) {
	240	if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
	241	tahvo_usb_power_off(tu);
	242	tu->phy.otg->gadget = NULL;
	243	mutex_unlock(&tu->serialize);
	244	return 0;
	245	}
	246
	247	tu->phy.otg->gadget = gadget;
	248	if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
	249	tahvo_usb_become_peripheral(tu);
	250
	251	mutex_unlock(&tu->serialize);
	252
	253	return 0;
	254	}
	255
	256	static irqreturn_t tahvo_usb_vbus_interrupt(int irq, void *_tu)
	257	{
	258	struct tahvo_usb *tu = _tu;
	259
	260	mutex_lock(&tu->serialize);
	261	check_vbus_state(tu);
	262	mutex_unlock(&tu->serialize);
	263
	264	return IRQ_HANDLED;
	265	}
	266
	267	static ssize_t otg_mode_show(struct device *device,
	268	struct device_attribute attr, char buf)
	269	{
	270	struct tahvo_usb *tu = dev_get_drvdata(device);
	271
	272	switch (tu->tahvo_mode) {
	273	case TAHVO_MODE_HOST:
	274	return sprintf(buf, "host\n");
	275	case TAHVO_MODE_PERIPHERAL:
	276	return sprintf(buf, "peripheral\n");
	277	}
	278
	279	return -EINVAL;
	280	}
	281
	282	static ssize_t otg_mode_store(struct device *device,
	283	struct device_attribute *attr,
	284	const char *buf, size_t count)
	285	{
	286	struct tahvo_usb *tu = dev_get_drvdata(device);
	287	int r;
	288
	289	mutex_lock(&tu->serialize);
	290	if (count >= 4 && strncmp(buf, "host", 4) == 0) {
	291	if (tu->tahvo_mode == TAHVO_MODE_PERIPHERAL)
	292	tahvo_usb_stop_peripheral(tu);
	293	tu->tahvo_mode = TAHVO_MODE_HOST;
	294	if (tu->phy.otg->host) {
	295	dev_info(device, "HOST mode: host controller present\n");
	296	tahvo_usb_become_host(tu);
	297	} else {
	298	dev_info(device, "HOST mode: no host controller, powering off\n");
	299	tahvo_usb_power_off(tu);
	300	}
301	r = strlen(buf);
302	} else if (count >= 10 && strncmp(buf, "peripheral", 10) == 0) {
303	if (tu->tahvo_mode == TAHVO_MODE_HOST)
304	tahvo_usb_stop_host(tu);
305	tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
306	if (tu->phy.otg->gadget) {
307	dev_info(device, "PERIPHERAL mode: gadget driver present\n");
308	tahvo_usb_become_peripheral(tu);
309	} else {
310	dev_info(device, "PERIPHERAL mode: no gadget driver, powering off\n");
311	tahvo_usb_power_off(tu);
312	}
313	r = strlen(buf);
314	} else {
315	r = -EINVAL;
316	}
317	mutex_unlock(&tu->serialize);
318
319	return r;
320	}
321	static DEVICE_ATTR(otg_mode, 0644, otg_mode_show, otg_mode_store);
322
323	static struct attribute *tahvo_attributes[] = {
324	&dev_attr_vbus.attr,
325	&dev_attr_otg_mode.attr,
326	NULL
327	};
328
329	static struct attribute_group tahvo_attr_group = {
330	.attrs = tahvo_attributes,
331	};
332
333	static int tahvo_usb_probe(struct platform_device *pdev)
334	{
335	struct retu_dev *rdev = dev_get_drvdata(pdev->dev.parent);
336	struct tahvo_usb *tu;
337	int ret;
338
339	tu = devm_kzalloc(&pdev->dev, sizeof(*tu), GFP_KERNEL);
340	if (!tu)
341	return -ENOMEM;
342
343	tu->phy.otg = devm_kzalloc(&pdev->dev, sizeof(*tu->phy.otg),
344	GFP_KERNEL);
345	if (!tu->phy.otg)
346	return -ENOMEM;
347
348	tu->pt_dev = pdev;
349
350	/* Default mode */
351	#ifdef CONFIG_TAHVO_USB_HOST_BY_DEFAULT
352	tu->tahvo_mode = TAHVO_MODE_HOST;
353	#else
354	tu->tahvo_mode = TAHVO_MODE_PERIPHERAL;
355	#endif
356
357	mutex_init(&tu->serialize);
358
359	tu->ick = devm_clk_get(&pdev->dev, "usb_l4_ick");
360	if (!IS_ERR(tu->ick))
361	clk_enable(tu->ick);
362
363	/*
364	* Set initial state, so that we generate kevents only on state changes.
365	*/
366	tu->vbus_state = retu_read(rdev, TAHVO_REG_IDSR) & TAHVO_STAT_VBUS;
367
860d2686 CC	368	tu->extcon = devm_extcon_dev_allocate(&pdev->dev, tahvo_cable);
	369	if (IS_ERR(tu->extcon)) {
	370	dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
	371	return -ENOMEM;
	372	}
9ba96ae5	373
860d2686	374	ret = devm_extcon_dev_register(&pdev->dev, tu->extcon);
9ba96ae5 AK	375	if (ret) {
	376	dev_err(&pdev->dev, "could not register extcon device: %d\n",
	377	ret);
	378	goto err_disable_clk;
	379	}
	380
	381	/* Set the initial cable state. */
860d2686	382	extcon_set_cable_state_(tu->extcon, EXTCON_USB_HOST,
9ba96ae5	383	tu->tahvo_mode == TAHVO_MODE_HOST);
860d2686	384	extcon_set_cable_state_(tu->extcon, EXTCON_USB, tu->vbus_state);
9ba96ae5 AK	385
	386	/* Create OTG interface */
	387	tahvo_usb_power_off(tu);
	388	tu->phy.dev = &pdev->dev;
e47d9254	389	tu->phy.otg->state = OTG_STATE_UNDEFINED;
9ba96ae5 AK	390	tu->phy.label = DRIVER_NAME;
	391	tu->phy.set_suspend = tahvo_usb_set_suspend;
	392
19c1eac2	393	tu->phy.otg->usb_phy = &tu->phy;
9ba96ae5 AK	394	tu->phy.otg->set_host = tahvo_usb_set_host;
	395	tu->phy.otg->set_peripheral = tahvo_usb_set_peripheral;
	396
	397	ret = usb_add_phy(&tu->phy, USB_PHY_TYPE_USB2);
	398	if (ret < 0) {
	399	dev_err(&pdev->dev, "cannot register USB transceiver: %d\n",
	400	ret);
860d2686	401	goto err_disable_clk;
9ba96ae5 AK	402	}
	403
	404	dev_set_drvdata(&pdev->dev, tu);
	405
	406	tu->irq = platform_get_irq(pdev, 0);
a81df9ee FE	407	ret = request_threaded_irq(tu->irq, NULL, tahvo_usb_vbus_interrupt,
a81df9ee FE	408	IRQF_ONESHOT,
9ba96ae5 AK	409	"tahvo-vbus", tu);
	410	if (ret) {
	411	dev_err(&pdev->dev, "could not register tahvo-vbus irq: %d\n",
	412	ret);
	413	goto err_remove_phy;
	414	}
	415
	416	/* Attributes */
	417	ret = sysfs_create_group(&pdev->dev.kobj, &tahvo_attr_group);
	418	if (ret) {
	419	dev_err(&pdev->dev, "cannot create sysfs group: %d\n", ret);
	420	goto err_free_irq;
	421	}
	422
	423	return 0;
	424
	425	err_free_irq:
	426	free_irq(tu->irq, tu);
	427	err_remove_phy:
	428	usb_remove_phy(&tu->phy);
9ba96ae5 AK	429	err_disable_clk:
	430	if (!IS_ERR(tu->ick))
	431	clk_disable(tu->ick);
	432
	433	return ret;
	434	}
	435
	436	static int tahvo_usb_remove(struct platform_device *pdev)
	437	{
	438	struct tahvo_usb *tu = platform_get_drvdata(pdev);
	439
	440	sysfs_remove_group(&pdev->dev.kobj, &tahvo_attr_group);
	441	free_irq(tu->irq, tu);
	442	usb_remove_phy(&tu->phy);
9ba96ae5 AK	443	if (!IS_ERR(tu->ick))
	444	clk_disable(tu->ick);
	445
	446	return 0;
	447	}
	448
	449	static struct platform_driver tahvo_usb_driver = {
	450	.probe = tahvo_usb_probe,
	451	.remove = tahvo_usb_remove,
	452	.driver = {
	453	.name = "tahvo-usb",
9ba96ae5 AK	454	},
	455	};
	456	module_platform_driver(tahvo_usb_driver);
	457
	458	MODULE_DESCRIPTION("Tahvo USB transceiver driver");
	459	MODULE_LICENSE("GPL");
	460	MODULE_AUTHOR("Juha Yrjölä, Tony Lindgren, and Timo Teräs");
	461	MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>");