[linux-2.6-block.git] / drivers / usb / otg / twl6030-usb.c

/*
 * twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
 *
 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Author: Hema HK <hemahk@ti.com>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/usb/musb-omap.h>
#include <linux/usb/phy_companion.h>
#include <linux/usb/omap_usb.h>
#include <linux/i2c/twl.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/delay.h>

/* usb register definitions */
#define USB_VENDOR_ID_LSB		0x00
#define USB_VENDOR_ID_MSB		0x01
#define USB_PRODUCT_ID_LSB		0x02
#define USB_PRODUCT_ID_MSB		0x03
#define USB_VBUS_CTRL_SET		0x04
#define USB_VBUS_CTRL_CLR		0x05
#define USB_ID_CTRL_SET			0x06
#define USB_ID_CTRL_CLR			0x07
#define USB_VBUS_INT_SRC		0x08
#define USB_VBUS_INT_LATCH_SET		0x09
#define USB_VBUS_INT_LATCH_CLR		0x0A
#define USB_VBUS_INT_EN_LO_SET		0x0B
#define USB_VBUS_INT_EN_LO_CLR		0x0C
#define USB_VBUS_INT_EN_HI_SET		0x0D
#define USB_VBUS_INT_EN_HI_CLR		0x0E
#define USB_ID_INT_SRC			0x0F
#define USB_ID_INT_LATCH_SET		0x10
#define USB_ID_INT_LATCH_CLR		0x11

#define USB_ID_INT_EN_LO_SET		0x12
#define USB_ID_INT_EN_LO_CLR		0x13
#define USB_ID_INT_EN_HI_SET		0x14
#define USB_ID_INT_EN_HI_CLR		0x15
#define USB_OTG_ADP_CTRL		0x16
#define USB_OTG_ADP_HIGH		0x17
#define USB_OTG_ADP_LOW			0x18
#define USB_OTG_ADP_RISE		0x19
#define USB_OTG_REVISION		0x1A

/* to be moved to LDO */
#define TWL6030_MISC2			0xE5
#define TWL6030_CFG_LDO_PD2		0xF5
#define TWL6030_BACKUP_REG		0xFA

#define STS_HW_CONDITIONS		0x21

/* In module TWL6030_MODULE_PM_MASTER */
#define STS_HW_CONDITIONS		0x21
#define STS_USB_ID			BIT(2)

/* In module TWL6030_MODULE_PM_RECEIVER */
#define VUSB_CFG_TRANS			0x71
#define VUSB_CFG_STATE			0x72
#define VUSB_CFG_VOLTAGE		0x73

/* in module TWL6030_MODULE_MAIN_CHARGE */

#define CHARGERUSB_CTRL1		0x8

#define CONTROLLER_STAT1		0x03
#define	VBUS_DET			BIT(2)

struct twl6030_usb {
	struct phy_companion	comparator;
	struct device		*dev;

	/* for vbus reporting with irqs disabled */
	spinlock_t		lock;

	struct regulator		*usb3v3;

	/* used to set vbus, in atomic path */
	struct work_struct	set_vbus_work;

	int			irq1;
	int			irq2;
	enum omap_musb_vbus_id_status linkstat;
	u8			asleep;
	bool			irq_enabled;
	bool			vbus_enable;
	const char		*regulator;
};

#define	comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)

/*-------------------------------------------------------------------------*/

static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
						u8 data, u8 address)
{
	int ret = 0;

	ret = twl_i2c_write_u8(module, data, address);
	if (ret < 0)
		dev_err(twl->dev,
			"Write[0x%x] Error %d\n", address, ret);
	return ret;
}

static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
{
	u8 data, ret = 0;

	ret = twl_i2c_read_u8(module, &data, address);
	if (ret >= 0)
		ret = data;
	else
		dev_err(twl->dev,
			"readb[0x%x,0x%x] Error %d\n",
					module, address, ret);
	return ret;
}

static int twl6030_start_srp(struct phy_companion *comparator)
{
	struct twl6030_usb *twl = comparator_to_twl(comparator);

	twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
	twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);

	mdelay(100);
	twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);

	return 0;
}

static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
{
	/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);

	/* Program CFG_LDO_PD2 register and set VUSB bit */
	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);

	/* Program MISC2 register and set bit VUSB_IN_VBAT */
	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);

	twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
	if (IS_ERR(twl->usb3v3))
		return -ENODEV;

	/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
	twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);

	/*
	 * Program the USB_ID_CTRL_SET register to enable GND drive
	 * and the ID comparators
	 */
	twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);

	return 0;
}

static ssize_t twl6030_usb_vbus_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct twl6030_usb *twl = dev_get_drvdata(dev);
	unsigned long flags;
	int ret = -EINVAL;

	spin_lock_irqsave(&twl->lock, flags);

	switch (twl->linkstat) {
	case OMAP_MUSB_VBUS_VALID:
	       ret = snprintf(buf, PAGE_SIZE, "vbus\n");
	       break;
	case OMAP_MUSB_ID_GROUND:
	       ret = snprintf(buf, PAGE_SIZE, "id\n");
	       break;
	case OMAP_MUSB_VBUS_OFF:
	       ret = snprintf(buf, PAGE_SIZE, "none\n");
	       break;
	default:
	       ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
	}
	spin_unlock_irqrestore(&twl->lock, flags);

	return ret;
}
static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);

static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
{
	struct twl6030_usb *twl = _twl;
	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
	u8 vbus_state, hw_state;

	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

	vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
						CONTROLLER_STAT1);
	if (!(hw_state & STS_USB_ID)) {
		if (vbus_state & VBUS_DET) {
			regulator_enable(twl->usb3v3);
			twl->asleep = 1;
			status = OMAP_MUSB_VBUS_VALID;
			twl->linkstat = status;
			omap_musb_mailbox(status);
		} else {
			if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
				status = OMAP_MUSB_VBUS_OFF;
				twl->linkstat = status;
				omap_musb_mailbox(status);
				if (twl->asleep) {
					regulator_disable(twl->usb3v3);
					twl->asleep = 0;
				}
			}
		}
	}
	sysfs_notify(&twl->dev->kobj, NULL, "vbus");

	return IRQ_HANDLED;
}

static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
{
	struct twl6030_usb *twl = _twl;
	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
	u8 hw_state;

	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

	if (hw_state & STS_USB_ID) {

		regulator_enable(twl->usb3v3);
		twl->asleep = 1;
		twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
		twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
		status = OMAP_MUSB_ID_GROUND;
		twl->linkstat = status;
		omap_musb_mailbox(status);
	} else  {
		twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
		twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
	}
	twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);

	return IRQ_HANDLED;
}

static int twl6030_enable_irq(struct twl6030_usb *twl)
{
	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
	twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
	twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);

	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
				REG_INT_MSK_LINE_C);
	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
				REG_INT_MSK_STS_C);
	twl6030_usb_irq(twl->irq2, twl);
	twl6030_usbotg_irq(twl->irq1, twl);

	return 0;
}

static void otg_set_vbus_work(struct work_struct *data)
{
	struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
								set_vbus_work);

	/*
	 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
	 * register. This enables boost mode.
	 */

	if (twl->vbus_enable)
		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
							CHARGERUSB_CTRL1);
	else
		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
							CHARGERUSB_CTRL1);
}

static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
{
	struct twl6030_usb *twl = comparator_to_twl(comparator);

	twl->vbus_enable = enabled;
	schedule_work(&twl->set_vbus_work);

	return 0;
}

static int __devinit twl6030_usb_probe(struct platform_device *pdev)
{
	u32 ret;
	struct twl6030_usb	*twl;
	int			status, err;
	struct device_node	*np = pdev->dev.of_node;
	struct device		*dev = &pdev->dev;
	struct twl4030_usb_data	*pdata = dev->platform_data;

	twl = devm_kzalloc(dev, sizeof *twl, GFP_KERNEL);
	if (!twl)
		return -ENOMEM;

	twl->dev		= &pdev->dev;
	twl->irq1		= platform_get_irq(pdev, 0);
	twl->irq2		= platform_get_irq(pdev, 1);
	twl->linkstat		= OMAP_MUSB_UNKNOWN;

	twl->comparator.set_vbus	= twl6030_set_vbus;
	twl->comparator.start_srp	= twl6030_start_srp;

	ret = omap_usb2_set_comparator(&twl->comparator);
	if (ret == -ENODEV) {
		dev_info(&pdev->dev, "phy not ready, deferring probe");
		return -EPROBE_DEFER;
	}

	if (np) {
		twl->regulator = "usb";
	} else if (pdata) {
		if (pdata->features & TWL6025_SUBCLASS)
			twl->regulator = "ldousb";
		else
			twl->regulator = "vusb";
	} else {
		dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
		return -EINVAL;
	}

	/* init spinlock for workqueue */
	spin_lock_init(&twl->lock);

	err = twl6030_usb_ldo_init(twl);
	if (err) {
		dev_err(&pdev->dev, "ldo init failed\n");
		return err;
	}

	platform_set_drvdata(pdev, twl);
	if (device_create_file(&pdev->dev, &dev_attr_vbus))
		dev_warn(&pdev->dev, "could not create sysfs file\n");

	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);

	twl->irq_enabled = true;
	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
			"twl6030_usb", twl);
	if (status < 0) {
		dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
			twl->irq1, status);
		device_remove_file(twl->dev, &dev_attr_vbus);
		return status;
	}

	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING | IRQF_ONESHOT,
			"twl6030_usb", twl);
	if (status < 0) {
		dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
			twl->irq2, status);
		free_irq(twl->irq1, twl);
		device_remove_file(twl->dev, &dev_attr_vbus);
		return status;
	}

	twl->asleep = 0;
	twl6030_enable_irq(twl);
	dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");

	return 0;
}

static int __exit twl6030_usb_remove(struct platform_device *pdev)
{
	struct twl6030_usb *twl = platform_get_drvdata(pdev);

	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
		REG_INT_MSK_LINE_C);
	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
			REG_INT_MSK_STS_C);
	free_irq(twl->irq1, twl);
	free_irq(twl->irq2, twl);
	regulator_put(twl->usb3v3);
	device_remove_file(twl->dev, &dev_attr_vbus);
	cancel_work_sync(&twl->set_vbus_work);

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id twl6030_usb_id_table[] = {
	{ .compatible = "ti,twl6030-usb" },
	{}
};
MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
#endif

static struct platform_driver twl6030_usb_driver = {
	.probe		= twl6030_usb_probe,
	.remove		= __exit_p(twl6030_usb_remove),
	.driver		= {
		.name	= "twl6030_usb",
		.owner	= THIS_MODULE,
		.of_match_table = of_match_ptr(twl6030_usb_id_table),
	},
};

static int __init twl6030_usb_init(void)
{
	return platform_driver_register(&twl6030_usb_driver);
}
subsys_initcall(twl6030_usb_init);

static void __exit twl6030_usb_exit(void)
{
	platform_driver_unregister(&twl6030_usb_driver);
}
module_exit(twl6030_usb_exit);

MODULE_ALIAS("platform:twl6030_usb");
MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
c33fad0c HH	1	/*
	2	* twl6030_usb - TWL6030 USB transceiver, talking to OMAP OTG driver.
	3	*
	4	* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*
	10	* Author: Hema HK <hemahk@ti.com>
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/interrupt.h>
	26	#include <linux/platform_device.h>
	27	#include <linux/io.h>
c9721438	28	#include <linux/usb/musb-omap.h>
0e98de67 KVA	29	#include <linux/usb/phy_companion.h>
0e98de67 KVA	30	#include <linux/usb/omap_usb.h>
c33fad0c HH	31	#include <linux/i2c/twl.h>
	32	#include <linux/regulator/consumer.h>
	33	#include <linux/err.h>
c33fad0c	34	#include <linux/slab.h>
603ab524	35	#include <linux/delay.h>
c33fad0c HH	36
	37	/* usb register definitions */
	38	#define USB_VENDOR_ID_LSB 0x00
	39	#define USB_VENDOR_ID_MSB 0x01
	40	#define USB_PRODUCT_ID_LSB 0x02
	41	#define USB_PRODUCT_ID_MSB 0x03
	42	#define USB_VBUS_CTRL_SET 0x04
	43	#define USB_VBUS_CTRL_CLR 0x05
	44	#define USB_ID_CTRL_SET 0x06
	45	#define USB_ID_CTRL_CLR 0x07
	46	#define USB_VBUS_INT_SRC 0x08
	47	#define USB_VBUS_INT_LATCH_SET 0x09
	48	#define USB_VBUS_INT_LATCH_CLR 0x0A
	49	#define USB_VBUS_INT_EN_LO_SET 0x0B
	50	#define USB_VBUS_INT_EN_LO_CLR 0x0C
	51	#define USB_VBUS_INT_EN_HI_SET 0x0D
	52	#define USB_VBUS_INT_EN_HI_CLR 0x0E
	53	#define USB_ID_INT_SRC 0x0F
	54	#define USB_ID_INT_LATCH_SET 0x10
	55	#define USB_ID_INT_LATCH_CLR 0x11
	56
	57	#define USB_ID_INT_EN_LO_SET 0x12
	58	#define USB_ID_INT_EN_LO_CLR 0x13
	59	#define USB_ID_INT_EN_HI_SET 0x14
	60	#define USB_ID_INT_EN_HI_CLR 0x15
	61	#define USB_OTG_ADP_CTRL 0x16
	62	#define USB_OTG_ADP_HIGH 0x17
	63	#define USB_OTG_ADP_LOW 0x18
	64	#define USB_OTG_ADP_RISE 0x19
	65	#define USB_OTG_REVISION 0x1A
	66
	67	/* to be moved to LDO */
	68	#define TWL6030_MISC2 0xE5
	69	#define TWL6030_CFG_LDO_PD2 0xF5
	70	#define TWL6030_BACKUP_REG 0xFA
	71
	72	#define STS_HW_CONDITIONS 0x21
	73
	74	/* In module TWL6030_MODULE_PM_MASTER */
	75	#define STS_HW_CONDITIONS 0x21
	76	#define STS_USB_ID BIT(2)
	77
	78	/* In module TWL6030_MODULE_PM_RECEIVER */
	79	#define VUSB_CFG_TRANS 0x71
	80	#define VUSB_CFG_STATE 0x72
	81	#define VUSB_CFG_VOLTAGE 0x73
	82
	83	/* in module TWL6030_MODULE_MAIN_CHARGE */
	84
	85	#define CHARGERUSB_CTRL1 0x8
	86
	87	#define CONTROLLER_STAT1 0x03
	88	#define VBUS_DET BIT(2)
	89
	90	struct twl6030_usb {
0e98de67	91	struct phy_companion comparator;
c33fad0c HH	92	struct device *dev;
	93
	94	/* for vbus reporting with irqs disabled */
	95	spinlock_t lock;
	96
	97	struct regulator *usb3v3;
	98
5bf54506 MS	99	/* used to set vbus, in atomic path */
	100	struct work_struct set_vbus_work;
	101
c33fad0c HH	102	int irq1;
c33fad0c HH	103	int irq2;
c9721438	104	enum omap_musb_vbus_id_status linkstat;
c33fad0c HH	105	u8 asleep;
c33fad0c HH	106	bool irq_enabled;
5bf54506	107	bool vbus_enable;
ff0a1f39	108	const char *regulator;
c33fad0c HH	109	};
c33fad0c HH	110
0e98de67	111	#define comparator_to_twl(x) container_of((x), struct twl6030_usb, comparator)
c33fad0c HH	112
	113	/-------------------------------------------------------------------------/
	114
	115	static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
	116	u8 data, u8 address)
	117	{
	118	int ret = 0;
	119
	120	ret = twl_i2c_write_u8(module, data, address);
	121	if (ret < 0)
	122	dev_err(twl->dev,
	123	"Write[0x%x] Error %d\n", address, ret);
	124	return ret;
	125	}
	126
	127	static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
	128	{
	129	u8 data, ret = 0;
	130
	131	ret = twl_i2c_read_u8(module, &data, address);
	132	if (ret >= 0)
	133	ret = data;
	134	else
	135	dev_err(twl->dev,
	136	"readb[0x%x,0x%x] Error %d\n",
	137	module, address, ret);
	138	return ret;
	139	}
	140
0e98de67	141	static int twl6030_start_srp(struct phy_companion *comparator)
c33fad0c	142	{
0e98de67	143	struct twl6030_usb *twl = comparator_to_twl(comparator);
603ab524 HH	144
	145	twl6030_writeb(twl, TWL_MODULE_USB, 0x24, USB_VBUS_CTRL_SET);
	146	twl6030_writeb(twl, TWL_MODULE_USB, 0x84, USB_VBUS_CTRL_SET);
	147
	148	mdelay(100);
	149	twl6030_writeb(twl, TWL_MODULE_USB, 0xa0, USB_VBUS_CTRL_CLR);
	150
	151	return 0;
	152	}
	153
c33fad0c HH	154	static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
c33fad0c HH	155	{
c33fad0c HH	156	/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
	157	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
	158
	159	/* Program CFG_LDO_PD2 register and set VUSB bit */
	160	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
	161
	162	/* Program MISC2 register and set bit VUSB_IN_VBAT */
	163	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
	164
ff0a1f39	165	twl->usb3v3 = regulator_get(twl->dev, twl->regulator);
c33fad0c HH	166	if (IS_ERR(twl->usb3v3))
	167	return -ENODEV;
	168
c33fad0c HH	169	/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
	170	twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
	171
	172	/*
	173	* Program the USB_ID_CTRL_SET register to enable GND drive
	174	* and the ID comparators
	175	*/
	176	twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
	177
	178	return 0;
	179	}
	180
	181	static ssize_t twl6030_usb_vbus_show(struct device *dev,
	182	struct device_attribute attr, char buf)
	183	{
	184	struct twl6030_usb *twl = dev_get_drvdata(dev);
	185	unsigned long flags;
	186	int ret = -EINVAL;
	187
	188	spin_lock_irqsave(&twl->lock, flags);
	189
	190	switch (twl->linkstat) {
c9721438	191	case OMAP_MUSB_VBUS_VALID:
c33fad0c HH	192	ret = snprintf(buf, PAGE_SIZE, "vbus\n");
c33fad0c HH	193	break;
c9721438	194	case OMAP_MUSB_ID_GROUND:
c33fad0c HH	195	ret = snprintf(buf, PAGE_SIZE, "id\n");
c33fad0c HH	196	break;
c9721438	197	case OMAP_MUSB_VBUS_OFF:
c33fad0c HH	198	ret = snprintf(buf, PAGE_SIZE, "none\n");
	199	break;
	200	default:
	201	ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
	202	}
	203	spin_unlock_irqrestore(&twl->lock, flags);
	204
	205	return ret;
	206	}
	207	static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
	208
	209	static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
	210	{
	211	struct twl6030_usb *twl = _twl;
c9721438	212	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
c33fad0c HH	213	u8 vbus_state, hw_state;
	214
	215	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
	216
	217	vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
	218	CONTROLLER_STAT1);
	219	if (!(hw_state & STS_USB_ID)) {
	220	if (vbus_state & VBUS_DET) {
6dc2503b HH	221	regulator_enable(twl->usb3v3);
6dc2503b HH	222	twl->asleep = 1;
c9721438	223	status = OMAP_MUSB_VBUS_VALID;
6dc2503b	224	twl->linkstat = status;
c9721438	225	omap_musb_mailbox(status);
c33fad0c	226	} else {
c9721438 KVA	227	if (twl->linkstat != OMAP_MUSB_UNKNOWN) {
	228	status = OMAP_MUSB_VBUS_OFF;
	229	twl->linkstat = status;
	230	omap_musb_mailbox(status);
	231	if (twl->asleep) {
	232	regulator_disable(twl->usb3v3);
	233	twl->asleep = 0;
	234	}
6dc2503b	235	}
c33fad0c HH	236	}
	237	}
	238	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
	239
	240	return IRQ_HANDLED;
	241	}
	242
	243	static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
	244	{
	245	struct twl6030_usb *twl = _twl;
c9721438	246	enum omap_musb_vbus_id_status status = OMAP_MUSB_UNKNOWN;
c33fad0c HH	247	u8 hw_state;
	248
	249	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
	250
	251	if (hw_state & STS_USB_ID) {
	252
6dc2503b HH	253	regulator_enable(twl->usb3v3);
6dc2503b HH	254	twl->asleep = 1;
dc8738d9 MS	255	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_CLR);
dc8738d9 MS	256	twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_SET);
c9721438	257	status = OMAP_MUSB_ID_GROUND;
31e9992a	258	twl->linkstat = status;
c9721438	259	omap_musb_mailbox(status);
c33fad0c	260	} else {
dc8738d9 MS	261	twl6030_writeb(twl, TWL_MODULE_USB, 0x10, USB_ID_INT_EN_HI_CLR);
dc8738d9 MS	262	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
c33fad0c	263	}
dc8738d9	264	twl6030_writeb(twl, TWL_MODULE_USB, status, USB_ID_INT_LATCH_CLR);
c33fad0c HH	265
	266	return IRQ_HANDLED;
	267	}
	268
0e98de67	269	static int twl6030_enable_irq(struct twl6030_usb *twl)
c33fad0c	270	{
dc8738d9	271	twl6030_writeb(twl, TWL_MODULE_USB, 0x1, USB_ID_INT_EN_HI_SET);
c33fad0c HH	272	twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
	273	twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
	274
	275	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
	276	REG_INT_MSK_LINE_C);
	277	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
	278	REG_INT_MSK_STS_C);
	279	twl6030_usb_irq(twl->irq2, twl);
	280	twl6030_usbotg_irq(twl->irq1, twl);
	281
	282	return 0;
	283	}
	284
5bf54506	285	static void otg_set_vbus_work(struct work_struct *data)
c33fad0c	286	{
5bf54506 MS	287	struct twl6030_usb *twl = container_of(data, struct twl6030_usb,
5bf54506 MS	288	set_vbus_work);
c33fad0c HH	289
	290	/*
	291	* Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
	292	* register. This enables boost mode.
	293	*/
5bf54506 MS	294
5bf54506 MS	295	if (twl->vbus_enable)
c33fad0c	296	twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
5bf54506 MS	297	CHARGERUSB_CTRL1);
5bf54506 MS	298	else
c33fad0c	299	twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
5bf54506 MS	300	CHARGERUSB_CTRL1);
	301	}
	302
0e98de67	303	static int twl6030_set_vbus(struct phy_companion *comparator, bool enabled)
5bf54506	304	{
0e98de67	305	struct twl6030_usb *twl = comparator_to_twl(comparator);
5bf54506 MS	306
	307	twl->vbus_enable = enabled;
	308	schedule_work(&twl->set_vbus_work);
	309
c33fad0c HH	310	return 0;
	311	}
	312
c33fad0c HH	313	static int __devinit twl6030_usb_probe(struct platform_device *pdev)
c33fad0c HH	314	{
0e98de67	315	u32 ret;
c33fad0c HH	316	struct twl6030_usb *twl;
c33fad0c HH	317	int status, err;
ff0a1f39 KVA	318	struct device_node *np = pdev->dev.of_node;
	319	struct device *dev = &pdev->dev;
	320	struct twl4030_usb_data *pdata = dev->platform_data;
c33fad0c	321
b8a3efa3	322	twl = devm_kzalloc(dev, sizeof *twl, GFP_KERNEL);
c33fad0c HH	323	if (!twl)
	324	return -ENOMEM;
	325
	326	twl->dev = &pdev->dev;
	327	twl->irq1 = platform_get_irq(pdev, 0);
	328	twl->irq2 = platform_get_irq(pdev, 1);
c9721438	329	twl->linkstat = OMAP_MUSB_UNKNOWN;
46b8f6b0	330
0e98de67 KVA	331	twl->comparator.set_vbus = twl6030_set_vbus;
0e98de67 KVA	332	twl->comparator.start_srp = twl6030_start_srp;
46b8f6b0	333
0e98de67 KVA	334	ret = omap_usb2_set_comparator(&twl->comparator);
	335	if (ret == -ENODEV) {
	336	dev_info(&pdev->dev, "phy not ready, deferring probe");
	337	return -EPROBE_DEFER;
	338	}
c33fad0c	339
ff0a1f39 KVA	340	if (np) {
	341	twl->regulator = "usb";
	342	} else if (pdata) {
	343	if (pdata->features & TWL6025_SUBCLASS)
	344	twl->regulator = "ldousb";
	345	else
	346	twl->regulator = "vusb";
	347	} else {
	348	dev_err(&pdev->dev, "twl6030 initialized without pdata\n");
	349	return -EINVAL;
	350	}
	351
c33fad0c HH	352	/* init spinlock for workqueue */
	353	spin_lock_init(&twl->lock);
	354
	355	err = twl6030_usb_ldo_init(twl);
	356	if (err) {
	357	dev_err(&pdev->dev, "ldo init failed\n");
c33fad0c HH	358	return err;
c33fad0c HH	359	}
c33fad0c HH	360
	361	platform_set_drvdata(pdev, twl);
	362	if (device_create_file(&pdev->dev, &dev_attr_vbus))
	363	dev_warn(&pdev->dev, "could not create sysfs file\n");
	364
5bf54506 MS	365	INIT_WORK(&twl->set_vbus_work, otg_set_vbus_work);
5bf54506 MS	366
c33fad0c HH	367	twl->irq_enabled = true;
c33fad0c HH	368	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
8f9d973a	369	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
c33fad0c HH	370	"twl6030_usb", twl);
	371	if (status < 0) {
	372	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	373	twl->irq1, status);
	374	device_remove_file(twl->dev, &dev_attr_vbus);
c33fad0c HH	375	return status;
	376	}
	377
	378	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
8f9d973a	379	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING \| IRQF_ONESHOT,
c33fad0c HH	380	"twl6030_usb", twl);
	381	if (status < 0) {
	382	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
	383	twl->irq2, status);
	384	free_irq(twl->irq1, twl);
	385	device_remove_file(twl->dev, &dev_attr_vbus);
c33fad0c HH	386	return status;
	387	}
	388
6dc2503b	389	twl->asleep = 0;
0e98de67	390	twl6030_enable_irq(twl);
c33fad0c HH	391	dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
	392
	393	return 0;
	394	}
	395
	396	static int __exit twl6030_usb_remove(struct platform_device *pdev)
	397	{
	398	struct twl6030_usb *twl = platform_get_drvdata(pdev);
	399
c33fad0c HH	400	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
	401	REG_INT_MSK_LINE_C);
	402	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
	403	REG_INT_MSK_STS_C);
	404	free_irq(twl->irq1, twl);
	405	free_irq(twl->irq2, twl);
	406	regulator_put(twl->usb3v3);
c33fad0c	407	device_remove_file(twl->dev, &dev_attr_vbus);
5bf54506	408	cancel_work_sync(&twl->set_vbus_work);
c33fad0c HH	409
	410	return 0;
	411	}
	412
ff0a1f39 KVA	413	#ifdef CONFIG_OF
	414	static const struct of_device_id twl6030_usb_id_table[] = {
	415	{ .compatible = "ti,twl6030-usb" },
	416	{}
	417	};
	418	MODULE_DEVICE_TABLE(of, twl6030_usb_id_table);
	419	#endif
	420
c33fad0c HH	421	static struct platform_driver twl6030_usb_driver = {
	422	.probe = twl6030_usb_probe,
	423	.remove = __exit_p(twl6030_usb_remove),
	424	.driver = {
	425	.name = "twl6030_usb",
	426	.owner = THIS_MODULE,
ff0a1f39	427	.of_match_table = of_match_ptr(twl6030_usb_id_table),
c33fad0c HH	428	},
	429	};
	430
	431	static int __init twl6030_usb_init(void)
	432	{
	433	return platform_driver_register(&twl6030_usb_driver);
	434	}
	435	subsys_initcall(twl6030_usb_init);
	436
	437	static void __exit twl6030_usb_exit(void)
	438	{
	439	platform_driver_unregister(&twl6030_usb_driver);
	440	}
	441	module_exit(twl6030_usb_exit);
	442
	443	MODULE_ALIAS("platform:twl6030_usb");
	444	MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
	445	MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
	446	MODULE_LICENSE("GPL");