[deliverable/linux.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/otg.h>
#include <linux/i2c/twl.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/notifier.h>
#include <linux/slab.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 otg_transceiver	otg;
	struct device		*dev;

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

	struct regulator		*usb3v3;

	int			irq1;
	int			irq2;
	u8			linkstat;
	u8			asleep;
	bool			irq_enabled;
};

#define xceiv_to_twl(x)		container_of((x), struct twl6030_usb, otg);

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

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_set_phy_clk(struct otg_transceiver *x, int on)
{
	struct twl6030_usb *twl;
	struct device *dev;
	struct twl4030_usb_data *pdata;

	twl = xceiv_to_twl(x);
	dev  = twl->dev;
	pdata = dev->platform_data;

	pdata->phy_set_clock(twl->dev, on);

	return 0;
}

static int twl6030_phy_init(struct otg_transceiver *x)
{
	u8 hw_state;
	struct twl6030_usb *twl;
	struct device *dev;
	struct twl4030_usb_data *pdata;

	twl = xceiv_to_twl(x);
	dev  = twl->dev;
	pdata = dev->platform_data;

	regulator_enable(twl->usb3v3);

	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

	if (hw_state & STS_USB_ID)
		pdata->phy_power(twl->dev, 1, 1);
	else
		pdata->phy_power(twl->dev, 0, 1);

	return 0;
}

static void twl6030_phy_shutdown(struct otg_transceiver *x)
{
	struct twl6030_usb *twl;
	struct device *dev;
	struct twl4030_usb_data *pdata;

	twl = xceiv_to_twl(x);
	dev  = twl->dev;
	pdata = dev->platform_data;
	pdata->phy_power(twl->dev, 0, 0);
	regulator_disable(twl->usb3v3);
}

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, "vusb");
	if (IS_ERR(twl->usb3v3))
		return -ENODEV;

	regulator_enable(twl->usb3v3);

	/* Program the VUSB_CFG_TRANS for ACTIVE state. */
	twl6030_writeb(twl, TWL_MODULE_PM_RECEIVER, 0x3F,
						VUSB_CFG_TRANS);

	/* Program the VUSB_CFG_STATE register to ON on all groups. */
	twl6030_writeb(twl, TWL_MODULE_PM_RECEIVER, 0xE1,
						VUSB_CFG_STATE);

	/* 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 USB_EVENT_VBUS:
	       ret = snprintf(buf, PAGE_SIZE, "vbus\n");
	       break;
	case USB_EVENT_ID:
	       ret = snprintf(buf, PAGE_SIZE, "id\n");
	       break;
	case USB_EVENT_NONE:
	       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;
	int status;
	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) {
			status = USB_EVENT_VBUS;
			twl->otg.default_a = false;
			twl->otg.state = OTG_STATE_B_IDLE;
		} else {
			status = USB_EVENT_NONE;
		}
		if (status >= 0) {
			twl->linkstat = status;
			blocking_notifier_call_chain(&twl->otg.notifier,
						status, twl->otg.gadget);
		}
	}
	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;
	int status = USB_EVENT_NONE;
	u8 hw_state;

	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);

	if (hw_state & STS_USB_ID) {

		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
								0x10);
		status = USB_EVENT_ID;
		twl->otg.default_a = true;
		twl->otg.state = OTG_STATE_A_IDLE;
		blocking_notifier_call_chain(&twl->otg.notifier, status,
							twl->otg.gadget);
	} else  {
		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
								0x10);
		twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
								0x1);
	}
	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status);
	twl->linkstat = status;

	return IRQ_HANDLED;
}

static int twl6030_set_peripheral(struct otg_transceiver *x,
		struct usb_gadget *gadget)
{
	struct twl6030_usb *twl;

	if (!x)
		return -ENODEV;

	twl = xceiv_to_twl(x);
	twl->otg.gadget = gadget;
	if (!gadget)
		twl->otg.state = OTG_STATE_UNDEFINED;

	return 0;
}

static int twl6030_enable_irq(struct otg_transceiver *x)
{
	struct twl6030_usb *twl = xceiv_to_twl(x);

	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1);
	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 int twl6030_set_vbus(struct otg_transceiver *x, bool enabled)
{
	struct twl6030_usb *twl = xceiv_to_twl(x);

	/*
	 * Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
	 * register. This enables boost mode.
	 */
	if (enabled)
		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
						CHARGERUSB_CTRL1);
	 else
		twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
						CHARGERUSB_CTRL1);
	return 0;
}

static int twl6030_set_host(struct otg_transceiver *x, struct usb_bus *host)
{
	struct twl6030_usb *twl;

	if (!x)
		return -ENODEV;

	twl = xceiv_to_twl(x);
	twl->otg.host = host;
	if (!host)
		twl->otg.state = OTG_STATE_UNDEFINED;
	return 0;
}

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

	twl = kzalloc(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->otg.dev		= twl->dev;
	twl->otg.label		= "twl6030";
	twl->otg.set_host	= twl6030_set_host;
	twl->otg.set_peripheral	= twl6030_set_peripheral;
	twl->otg.set_vbus	= twl6030_set_vbus;
	twl->otg.init		= twl6030_phy_init;
	twl->otg.shutdown	= twl6030_phy_shutdown;

	/* 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");
		kfree(twl);
		return err;
	}
	otg_set_transceiver(&twl->otg);

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

	BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier);

	twl->irq_enabled = true;
	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
			"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);
		kfree(twl);
		return status;
	}

	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
			IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
			"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);
		kfree(twl);
		return status;
	}

	pdata->phy_init(dev);
	twl6030_enable_irq(&twl->otg);
	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);

	struct twl4030_usb_data *pdata;
	struct device *dev = &pdev->dev;
	pdata = dev->platform_data;

	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);
	pdata->phy_exit(twl->dev);
	device_remove_file(twl->dev, &dev_attr_vbus);
	kfree(twl);

	return 0;
}

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

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>
	28	#include <linux/usb/otg.h>
	29	#include <linux/i2c/twl.h>
	30	#include <linux/regulator/consumer.h>
	31	#include <linux/err.h>
	32	#include <linux/notifier.h>
	33	#include <linux/slab.h>
	34
	35	/* usb register definitions */
	36	#define USB_VENDOR_ID_LSB 0x00
	37	#define USB_VENDOR_ID_MSB 0x01
	38	#define USB_PRODUCT_ID_LSB 0x02
	39	#define USB_PRODUCT_ID_MSB 0x03
	40	#define USB_VBUS_CTRL_SET 0x04
	41	#define USB_VBUS_CTRL_CLR 0x05
	42	#define USB_ID_CTRL_SET 0x06
	43	#define USB_ID_CTRL_CLR 0x07
	44	#define USB_VBUS_INT_SRC 0x08
	45	#define USB_VBUS_INT_LATCH_SET 0x09
	46	#define USB_VBUS_INT_LATCH_CLR 0x0A
	47	#define USB_VBUS_INT_EN_LO_SET 0x0B
	48	#define USB_VBUS_INT_EN_LO_CLR 0x0C
	49	#define USB_VBUS_INT_EN_HI_SET 0x0D
	50	#define USB_VBUS_INT_EN_HI_CLR 0x0E
	51	#define USB_ID_INT_SRC 0x0F
	52	#define USB_ID_INT_LATCH_SET 0x10
	53	#define USB_ID_INT_LATCH_CLR 0x11
	54
	55	#define USB_ID_INT_EN_LO_SET 0x12
	56	#define USB_ID_INT_EN_LO_CLR 0x13
	57	#define USB_ID_INT_EN_HI_SET 0x14
	58	#define USB_ID_INT_EN_HI_CLR 0x15
	59	#define USB_OTG_ADP_CTRL 0x16
	60	#define USB_OTG_ADP_HIGH 0x17
	61	#define USB_OTG_ADP_LOW 0x18
	62	#define USB_OTG_ADP_RISE 0x19
	63	#define USB_OTG_REVISION 0x1A
	64
65	/* to be moved to LDO */
66	#define TWL6030_MISC2 0xE5
67	#define TWL6030_CFG_LDO_PD2 0xF5
68	#define TWL6030_BACKUP_REG 0xFA
69
70	#define STS_HW_CONDITIONS 0x21
71
72	/* In module TWL6030_MODULE_PM_MASTER */
73	#define STS_HW_CONDITIONS 0x21
74	#define STS_USB_ID BIT(2)
75
76	/* In module TWL6030_MODULE_PM_RECEIVER */
77	#define VUSB_CFG_TRANS 0x71
78	#define VUSB_CFG_STATE 0x72
79	#define VUSB_CFG_VOLTAGE 0x73
80
81	/* in module TWL6030_MODULE_MAIN_CHARGE */
82
83	#define CHARGERUSB_CTRL1 0x8
84
85	#define CONTROLLER_STAT1 0x03
86	#define VBUS_DET BIT(2)
87
88	struct twl6030_usb {
89	struct otg_transceiver otg;
90	struct device *dev;
91
92	/* for vbus reporting with irqs disabled */
93	spinlock_t lock;
94
95	struct regulator *usb3v3;
96
97	int irq1;
98	int irq2;
99	u8 linkstat;
100	u8 asleep;
101	bool irq_enabled;
102	};
103
104	#define xceiv_to_twl(x) container_of((x), struct twl6030_usb, otg);
105
106	/-------------------------------------------------------------------------/
107
108	static inline int twl6030_writeb(struct twl6030_usb *twl, u8 module,
109	u8 data, u8 address)
110	{
111	int ret = 0;
112
113	ret = twl_i2c_write_u8(module, data, address);
114	if (ret < 0)
115	dev_err(twl->dev,
116	"Write[0x%x] Error %d\n", address, ret);
117	return ret;
118	}
119
120	static inline u8 twl6030_readb(struct twl6030_usb *twl, u8 module, u8 address)
121	{
122	u8 data, ret = 0;
123
124	ret = twl_i2c_read_u8(module, &data, address);
125	if (ret >= 0)
126	ret = data;
127	else
128	dev_err(twl->dev,
129	"readb[0x%x,0x%x] Error %d\n",
130	module, address, ret);
131	return ret;
132	}
133
134	/-------------------------------------------------------------------------/
135	static int twl6030_set_phy_clk(struct otg_transceiver *x, int on)
136	{
137	struct twl6030_usb *twl;
138	struct device *dev;
139	struct twl4030_usb_data *pdata;
140
141	twl = xceiv_to_twl(x);
142	dev = twl->dev;
143	pdata = dev->platform_data;
144
145	pdata->phy_set_clock(twl->dev, on);
146
147	return 0;
148	}
149
150	static int twl6030_phy_init(struct otg_transceiver *x)
151	{
152	u8 hw_state;
153	struct twl6030_usb *twl;
154	struct device *dev;
155	struct twl4030_usb_data *pdata;
156
157	twl = xceiv_to_twl(x);
158	dev = twl->dev;
159	pdata = dev->platform_data;
160
161	regulator_enable(twl->usb3v3);
162
163	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
164
165	if (hw_state & STS_USB_ID)
166	pdata->phy_power(twl->dev, 1, 1);
167	else
168	pdata->phy_power(twl->dev, 0, 1);
169
170	return 0;
171	}
172
173	static void twl6030_phy_shutdown(struct otg_transceiver *x)
174	{
175	struct twl6030_usb *twl;
176	struct device *dev;
177	struct twl4030_usb_data *pdata;
178
179	twl = xceiv_to_twl(x);
180	dev = twl->dev;
181	pdata = dev->platform_data;
182	pdata->phy_power(twl->dev, 0, 0);
183	regulator_disable(twl->usb3v3);
184	}
185
186	static int twl6030_usb_ldo_init(struct twl6030_usb *twl)
187	{
188
189	/* Set to OTG_REV 1.3 and turn on the ID_WAKEUP_COMP */
190	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_BACKUP_REG);
191
192	/* Program CFG_LDO_PD2 register and set VUSB bit */
193	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x1, TWL6030_CFG_LDO_PD2);
194
195	/* Program MISC2 register and set bit VUSB_IN_VBAT */
196	twl6030_writeb(twl, TWL6030_MODULE_ID0 , 0x10, TWL6030_MISC2);
197
198	twl->usb3v3 = regulator_get(twl->dev, "vusb");
199	if (IS_ERR(twl->usb3v3))
200	return -ENODEV;
201
202	regulator_enable(twl->usb3v3);
203
204	/* Program the VUSB_CFG_TRANS for ACTIVE state. */
205	twl6030_writeb(twl, TWL_MODULE_PM_RECEIVER, 0x3F,
206	VUSB_CFG_TRANS);
207
208	/* Program the VUSB_CFG_STATE register to ON on all groups. */
209	twl6030_writeb(twl, TWL_MODULE_PM_RECEIVER, 0xE1,
210	VUSB_CFG_STATE);
211
212	/* Program the USB_VBUS_CTRL_SET and set VBUS_ACT_COMP bit */
213	twl6030_writeb(twl, TWL_MODULE_USB, 0x4, USB_VBUS_CTRL_SET);
214
215	/*
216	* Program the USB_ID_CTRL_SET register to enable GND drive
217	* and the ID comparators
218	*/
219	twl6030_writeb(twl, TWL_MODULE_USB, 0x14, USB_ID_CTRL_SET);
220
221	return 0;
222	}
223
224	static ssize_t twl6030_usb_vbus_show(struct device *dev,
225	struct device_attribute attr, char buf)
226	{
227	struct twl6030_usb *twl = dev_get_drvdata(dev);
228	unsigned long flags;
229	int ret = -EINVAL;
230
231	spin_lock_irqsave(&twl->lock, flags);
232
233	switch (twl->linkstat) {
234	case USB_EVENT_VBUS:
235	ret = snprintf(buf, PAGE_SIZE, "vbus\n");
236	break;
237	case USB_EVENT_ID:
238	ret = snprintf(buf, PAGE_SIZE, "id\n");
239	break;
240	case USB_EVENT_NONE:
241	ret = snprintf(buf, PAGE_SIZE, "none\n");
242	break;
243	default:
244	ret = snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
245	}
246	spin_unlock_irqrestore(&twl->lock, flags);
247
248	return ret;
249	}
250	static DEVICE_ATTR(vbus, 0444, twl6030_usb_vbus_show, NULL);
251
252	static irqreturn_t twl6030_usb_irq(int irq, void *_twl)
253	{
254	struct twl6030_usb *twl = _twl;
255	int status;
256	u8 vbus_state, hw_state;
257
258	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
259
260	vbus_state = twl6030_readb(twl, TWL_MODULE_MAIN_CHARGE,
261	CONTROLLER_STAT1);
262	if (!(hw_state & STS_USB_ID)) {
263	if (vbus_state & VBUS_DET) {
264	status = USB_EVENT_VBUS;
265	twl->otg.default_a = false;
266	twl->otg.state = OTG_STATE_B_IDLE;
267	} else {
268	status = USB_EVENT_NONE;
269	}
270	if (status >= 0) {
271	twl->linkstat = status;
272	blocking_notifier_call_chain(&twl->otg.notifier,
273	status, twl->otg.gadget);
274	}
275	}
276	sysfs_notify(&twl->dev->kobj, NULL, "vbus");
277
278	return IRQ_HANDLED;
279	}
280
281	static irqreturn_t twl6030_usbotg_irq(int irq, void *_twl)
282	{
283	struct twl6030_usb *twl = _twl;
284	int status = USB_EVENT_NONE;
285	u8 hw_state;
286
287	hw_state = twl6030_readb(twl, TWL6030_MODULE_ID0, STS_HW_CONDITIONS);
288
289	if (hw_state & STS_USB_ID) {
290
291	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR, 0x1);
292	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
293	0x10);
294	status = USB_EVENT_ID;
295	twl->otg.default_a = true;
296	twl->otg.state = OTG_STATE_A_IDLE;
297	blocking_notifier_call_chain(&twl->otg.notifier, status,
298	twl->otg.gadget);
299	} else {
300	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_CLR,
301	0x10);
302	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET,
303	0x1);
304	}
305	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_LATCH_CLR, status);
306	twl->linkstat = status;
307
308	return IRQ_HANDLED;
309	}
310
311	static int twl6030_set_peripheral(struct otg_transceiver *x,
312	struct usb_gadget *gadget)
313	{
314	struct twl6030_usb *twl;
315
316	if (!x)
317	return -ENODEV;
318
319	twl = xceiv_to_twl(x);
320	twl->otg.gadget = gadget;
321	if (!gadget)
322	twl->otg.state = OTG_STATE_UNDEFINED;
323
324	return 0;
325	}
326
327	static int twl6030_enable_irq(struct otg_transceiver *x)
328	{
329	struct twl6030_usb *twl = xceiv_to_twl(x);
330
331	twl6030_writeb(twl, TWL_MODULE_USB, USB_ID_INT_EN_HI_SET, 0x1);
332	twl6030_interrupt_unmask(0x05, REG_INT_MSK_LINE_C);
333	twl6030_interrupt_unmask(0x05, REG_INT_MSK_STS_C);
334
335	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
336	REG_INT_MSK_LINE_C);
337	twl6030_interrupt_unmask(TWL6030_CHARGER_CTRL_INT_MASK,
338	REG_INT_MSK_STS_C);
339	twl6030_usb_irq(twl->irq2, twl);
340	twl6030_usbotg_irq(twl->irq1, twl);
341
342	return 0;
343	}
344
345	static int twl6030_set_vbus(struct otg_transceiver *x, bool enabled)
346	{
347	struct twl6030_usb *twl = xceiv_to_twl(x);
348
349	/*
350	* Start driving VBUS. Set OPA_MODE bit in CHARGERUSB_CTRL1
351	* register. This enables boost mode.
352	*/
353	if (enabled)
354	twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x40,
355	CHARGERUSB_CTRL1);
356	else
357	twl6030_writeb(twl, TWL_MODULE_MAIN_CHARGE , 0x00,
358	CHARGERUSB_CTRL1);
359	return 0;
360	}
361
362	static int twl6030_set_host(struct otg_transceiver x, struct usb_bus host)
363	{
364	struct twl6030_usb *twl;
365
366	if (!x)
367	return -ENODEV;
368
369	twl = xceiv_to_twl(x);
370	twl->otg.host = host;
371	if (!host)
372	twl->otg.state = OTG_STATE_UNDEFINED;
373	return 0;
374	}
375
376	static int __devinit twl6030_usb_probe(struct platform_device *pdev)
377	{
378	struct twl6030_usb *twl;
379	int status, err;
380	struct twl4030_usb_data *pdata;
381	struct device *dev = &pdev->dev;
382	pdata = dev->platform_data;
383
384	twl = kzalloc(sizeof *twl, GFP_KERNEL);
385	if (!twl)
386	return -ENOMEM;
387
388	twl->dev = &pdev->dev;
389	twl->irq1 = platform_get_irq(pdev, 0);
390	twl->irq2 = platform_get_irq(pdev, 1);
391	twl->otg.dev = twl->dev;
392	twl->otg.label = "twl6030";
393	twl->otg.set_host = twl6030_set_host;
394	twl->otg.set_peripheral = twl6030_set_peripheral;
395	twl->otg.set_vbus = twl6030_set_vbus;
396	twl->otg.init = twl6030_phy_init;
397	twl->otg.shutdown = twl6030_phy_shutdown;
398
399	/* init spinlock for workqueue */
400	spin_lock_init(&twl->lock);
401
402	err = twl6030_usb_ldo_init(twl);
403	if (err) {
404	dev_err(&pdev->dev, "ldo init failed\n");
405	kfree(twl);
406	return err;
407	}
408	otg_set_transceiver(&twl->otg);
409
410	platform_set_drvdata(pdev, twl);
411	if (device_create_file(&pdev->dev, &dev_attr_vbus))
412	dev_warn(&pdev->dev, "could not create sysfs file\n");
413
414	BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
415
416	twl->irq_enabled = true;
417	status = request_threaded_irq(twl->irq1, NULL, twl6030_usbotg_irq,
418	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING,
419	"twl6030_usb", twl);
420	if (status < 0) {
421	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
422	twl->irq1, status);
423	device_remove_file(twl->dev, &dev_attr_vbus);
424	kfree(twl);
425	return status;
426	}
427
428	status = request_threaded_irq(twl->irq2, NULL, twl6030_usb_irq,
429	IRQF_TRIGGER_FALLING \| IRQF_TRIGGER_RISING,
430	"twl6030_usb", twl);
431	if (status < 0) {
432	dev_err(&pdev->dev, "can't get IRQ %d, err %d\n",
433	twl->irq2, status);
434	free_irq(twl->irq1, twl);
435	device_remove_file(twl->dev, &dev_attr_vbus);
436	kfree(twl);
437	return status;
438	}
439
440	pdata->phy_init(dev);
441	twl6030_enable_irq(&twl->otg);
442	dev_info(&pdev->dev, "Initialized TWL6030 USB module\n");
443
444	return 0;
445	}
446
447	static int __exit twl6030_usb_remove(struct platform_device *pdev)
448	{
449	struct twl6030_usb *twl = platform_get_drvdata(pdev);
450
451	struct twl4030_usb_data *pdata;
452	struct device *dev = &pdev->dev;
453	pdata = dev->platform_data;
454
455	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
456	REG_INT_MSK_LINE_C);
457	twl6030_interrupt_mask(TWL6030_USBOTG_INT_MASK,
458	REG_INT_MSK_STS_C);
459	free_irq(twl->irq1, twl);
460	free_irq(twl->irq2, twl);
461	regulator_put(twl->usb3v3);
462	pdata->phy_exit(twl->dev);
463	device_remove_file(twl->dev, &dev_attr_vbus);
464	kfree(twl);
465
466	return 0;
467	}
468
469	static struct platform_driver twl6030_usb_driver = {
470	.probe = twl6030_usb_probe,
471	.remove = __exit_p(twl6030_usb_remove),
472	.driver = {
473	.name = "twl6030_usb",
474	.owner = THIS_MODULE,
475	},
476	};
477
478	static int __init twl6030_usb_init(void)
479	{
480	return platform_driver_register(&twl6030_usb_driver);
481	}
482	subsys_initcall(twl6030_usb_init);
483
484	static void __exit twl6030_usb_exit(void)
485	{
486	platform_driver_unregister(&twl6030_usb_driver);
487	}
488	module_exit(twl6030_usb_exit);
489
490	MODULE_ALIAS("platform:twl6030_usb");
491	MODULE_AUTHOR("Hema HK <hemahk@ti.com>");
492	MODULE_DESCRIPTION("TWL6030 USB transceiver driver");
493	MODULE_LICENSE("GPL");