Commit a1bb73d7 authored by Donggeun Kim's avatar Donggeun Kim Committed by Linus Torvalds
Browse files

drivers/misc: add support the FSA9480 USB Switch 



The FSA9480 is a USB port accessory detector and switch.  This patch adds
support the FSA9480 USB Switch.

[akpm@linux-foundation.org: make a couple of things static]
Signed-off-by: default avatarDonggeun Kim <dg77.kim@samsung.com>
Signed-off-by: default avatarMinkyu Kang <mk7.kang@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 703f03c8

Documentation/ABI/testing/sysfs-bus-i2c-devices-fsa9480

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What:		/sys/bus/i2c/devices/.../device

Date:		February 2011

Contact:	Minkyu Kang <mk7.kang@samsung.com>

Description:

		show what device is attached

		NONE - no device

		USB - USB device is attached

		UART - UART is attached

		CHARGER - Charger is attaced

		JIG - JIG is attached



What:		/sys/bus/i2c/devices/.../switch

Date:		February 2011

Contact:	Minkyu Kang <mk7.kang@samsung.com>

Description:

		show or set the state of manual switch

		VAUDIO - switch to VAUDIO path

		UART - switch to UART path

		AUDIO - switch to AUDIO path

		DHOST - switch to DHOST path

		AUTO - switch automatically by device

drivers/misc/Kconfig

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Original line number Diff line number Diff line
@@ -489,6 +489,15 @@ config PCH_PHUB 
	  To compile this driver as a module, choose M here: the module will

	  be called pch_phub.



config USB_SWITCH_FSA9480

	tristate "FSA9480 USB Switch"

	depends on I2C

	help

	  The FSA9480 is a USB port accessory detector and switch.

	  The FSA9480 is fully controlled using I2C and enables USB data,

	  stereo and mono audio, video, microphone and UART data to use

	  a common connector port.



source "drivers/misc/c2port/Kconfig"

source "drivers/misc/eeprom/Kconfig"

source "drivers/misc/cb710/Kconfig"

drivers/misc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -46,3 +46,4 @@ obj-y += ti-st/ 
obj-$(CONFIG_AB8500_PWM)	+= ab8500-pwm.o

obj-y				+= lis3lv02d/

obj-y				+= carma/

obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o

drivers/misc/fsa9480.c

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/*

 * fsa9480.c - FSA9480 micro USB switch device driver

 *

 * Copyright (C) 2010 Samsung Electronics

 * Minkyu Kang <mk7.kang@samsung.com>

 * Wonguk Jeong <wonguk.jeong@samsung.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/module.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/platform_data/fsa9480.h>

#include <linux/irq.h>

#include <linux/interrupt.h>

#include <linux/workqueue.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/pm_runtime.h>



/* FSA9480 I2C registers */

#define FSA9480_REG_DEVID		0x01

#define FSA9480_REG_CTRL		0x02

#define FSA9480_REG_INT1		0x03

#define FSA9480_REG_INT2		0x04

#define FSA9480_REG_INT1_MASK		0x05

#define FSA9480_REG_INT2_MASK		0x06

#define FSA9480_REG_ADC			0x07

#define FSA9480_REG_TIMING1		0x08

#define FSA9480_REG_TIMING2		0x09

#define FSA9480_REG_DEV_T1		0x0a

#define FSA9480_REG_DEV_T2		0x0b

#define FSA9480_REG_BTN1		0x0c

#define FSA9480_REG_BTN2		0x0d

#define FSA9480_REG_CK			0x0e

#define FSA9480_REG_CK_INT1		0x0f

#define FSA9480_REG_CK_INT2		0x10

#define FSA9480_REG_CK_INTMASK1		0x11

#define FSA9480_REG_CK_INTMASK2		0x12

#define FSA9480_REG_MANSW1		0x13

#define FSA9480_REG_MANSW2		0x14



/* Control */

#define CON_SWITCH_OPEN		(1 << 4)

#define CON_RAW_DATA		(1 << 3)

#define CON_MANUAL_SW		(1 << 2)

#define CON_WAIT		(1 << 1)

#define CON_INT_MASK		(1 << 0)

#define CON_MASK		(CON_SWITCH_OPEN | CON_RAW_DATA | \

				CON_MANUAL_SW | CON_WAIT)



/* Device Type 1 */

#define DEV_USB_OTG		(1 << 7)

#define DEV_DEDICATED_CHG	(1 << 6)

#define DEV_USB_CHG		(1 << 5)

#define DEV_CAR_KIT		(1 << 4)

#define DEV_UART		(1 << 3)

#define DEV_USB			(1 << 2)

#define DEV_AUDIO_2		(1 << 1)

#define DEV_AUDIO_1		(1 << 0)



#define DEV_T1_USB_MASK		(DEV_USB_OTG | DEV_USB)

#define DEV_T1_UART_MASK	(DEV_UART)

#define DEV_T1_CHARGER_MASK	(DEV_DEDICATED_CHG | DEV_USB_CHG)



/* Device Type 2 */

#define DEV_AV			(1 << 6)

#define DEV_TTY			(1 << 5)

#define DEV_PPD			(1 << 4)

#define DEV_JIG_UART_OFF	(1 << 3)

#define DEV_JIG_UART_ON		(1 << 2)

#define DEV_JIG_USB_OFF		(1 << 1)

#define DEV_JIG_USB_ON		(1 << 0)



#define DEV_T2_USB_MASK		(DEV_JIG_USB_OFF | DEV_JIG_USB_ON)

#define DEV_T2_UART_MASK	(DEV_JIG_UART_OFF | DEV_JIG_UART_ON)

#define DEV_T2_JIG_MASK		(DEV_JIG_USB_OFF | DEV_JIG_USB_ON | \

				DEV_JIG_UART_OFF | DEV_JIG_UART_ON)



/*

 * Manual Switch

 * D- [7:5] / D+ [4:2]

 * 000: Open all / 001: USB / 010: AUDIO / 011: UART / 100: V_AUDIO

 */

#define SW_VAUDIO		((4 << 5) | (4 << 2))

#define SW_UART			((3 << 5) | (3 << 2))

#define SW_AUDIO		((2 << 5) | (2 << 2))

#define SW_DHOST		((1 << 5) | (1 << 2))

#define SW_AUTO			((0 << 5) | (0 << 2))



/* Interrupt 1 */

#define INT_DETACH		(1 << 1)

#define INT_ATTACH		(1 << 0)



struct fsa9480_usbsw {

	struct i2c_client		*client;

	struct fsa9480_platform_data	*pdata;

	int				dev1;

	int				dev2;

	int				mansw;

};



static struct fsa9480_usbsw *chip;



static int fsa9480_write_reg(struct i2c_client *client,

		int reg, int value)

{

	int ret;



	ret = i2c_smbus_write_byte_data(client, reg, value);



	if (ret < 0)

		dev_err(&client->dev, "%s: err %d\n", __func__, ret);



	return ret;

}



static int fsa9480_read_reg(struct i2c_client *client, int reg)

{

	int ret;



	ret = i2c_smbus_read_byte_data(client, reg);



	if (ret < 0)

		dev_err(&client->dev, "%s: err %d\n", __func__, ret);



	return ret;

}



static int fsa9480_read_irq(struct i2c_client *client, int *value)

{

	int ret;



	ret = i2c_smbus_read_i2c_block_data(client,

			FSA9480_REG_INT1, 2, (u8 *)value);

	*value &= 0xffff;



	if (ret < 0)

		dev_err(&client->dev, "%s: err %d\n", __func__, ret);



	return ret;

}



static void fsa9480_set_switch(const char *buf)

{

	struct fsa9480_usbsw *usbsw = chip;

	struct i2c_client *client = usbsw->client;

	unsigned int value;

	unsigned int path = 0;



	value = fsa9480_read_reg(client, FSA9480_REG_CTRL);



	if (!strncmp(buf, "VAUDIO", 6)) {

		path = SW_VAUDIO;

		value &= ~CON_MANUAL_SW;

	} else if (!strncmp(buf, "UART", 4)) {

		path = SW_UART;

		value &= ~CON_MANUAL_SW;

	} else if (!strncmp(buf, "AUDIO", 5)) {

		path = SW_AUDIO;

		value &= ~CON_MANUAL_SW;

	} else if (!strncmp(buf, "DHOST", 5)) {

		path = SW_DHOST;

		value &= ~CON_MANUAL_SW;

	} else if (!strncmp(buf, "AUTO", 4)) {

		path = SW_AUTO;

		value |= CON_MANUAL_SW;

	} else {

		printk(KERN_ERR "Wrong command\n");

		return;

	}



	usbsw->mansw = path;

	fsa9480_write_reg(client, FSA9480_REG_MANSW1, path);

	fsa9480_write_reg(client, FSA9480_REG_CTRL, value);

}



static ssize_t fsa9480_get_switch(char *buf)

{

	struct fsa9480_usbsw *usbsw = chip;

	struct i2c_client *client = usbsw->client;

	unsigned int value;



	value = fsa9480_read_reg(client, FSA9480_REG_MANSW1);



	if (value == SW_VAUDIO)

		return sprintf(buf, "VAUDIO\n");

	else if (value == SW_UART)

		return sprintf(buf, "UART\n");

	else if (value == SW_AUDIO)

		return sprintf(buf, "AUDIO\n");

	else if (value == SW_DHOST)

		return sprintf(buf, "DHOST\n");

	else if (value == SW_AUTO)

		return sprintf(buf, "AUTO\n");

	else

		return sprintf(buf, "%x", value);

}



static ssize_t fsa9480_show_device(struct device *dev,

				   struct device_attribute *attr,

				   char *buf)

{

	struct fsa9480_usbsw *usbsw = dev_get_drvdata(dev);

	struct i2c_client *client = usbsw->client;

	int dev1, dev2;



	dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);

	dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);



	if (!dev1 && !dev2)

		return sprintf(buf, "NONE\n");



	/* USB */

	if (dev1 & DEV_T1_USB_MASK || dev2 & DEV_T2_USB_MASK)

		return sprintf(buf, "USB\n");



	/* UART */

	if (dev1 & DEV_T1_UART_MASK || dev2 & DEV_T2_UART_MASK)

		return sprintf(buf, "UART\n");



	/* CHARGER */

	if (dev1 & DEV_T1_CHARGER_MASK)

		return sprintf(buf, "CHARGER\n");



	/* JIG */

	if (dev2 & DEV_T2_JIG_MASK)

		return sprintf(buf, "JIG\n");



	return sprintf(buf, "UNKNOWN\n");

}



static ssize_t fsa9480_show_manualsw(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	return fsa9480_get_switch(buf);



}



static ssize_t fsa9480_set_manualsw(struct device *dev,

				    struct device_attribute *attr,

				    const char *buf, size_t count)

{

	fsa9480_set_switch(buf);



	return count;

}



static DEVICE_ATTR(device, S_IRUGO, fsa9480_show_device, NULL);

static DEVICE_ATTR(switch, S_IRUGO | S_IWUSR,

		fsa9480_show_manualsw, fsa9480_set_manualsw);



static struct attribute *fsa9480_attributes[] = {

	&dev_attr_device.attr,

	&dev_attr_switch.attr,

	NULL

};



static const struct attribute_group fsa9480_group = {

	.attrs = fsa9480_attributes,

};



static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw, int intr)

{

	int val1, val2, ctrl;

	struct fsa9480_platform_data *pdata = usbsw->pdata;

	struct i2c_client *client = usbsw->client;



	val1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);

	val2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);

	ctrl = fsa9480_read_reg(client, FSA9480_REG_CTRL);



	dev_info(&client->dev, "intr: 0x%x, dev1: 0x%x, dev2: 0x%x\n",

			intr, val1, val2);



	if (!intr)

		goto out;



	if (intr & INT_ATTACH) {	/* Attached */

		/* USB */

		if (val1 & DEV_T1_USB_MASK || val2 & DEV_T2_USB_MASK) {

			if (pdata->usb_cb)

				pdata->usb_cb(FSA9480_ATTACHED);



			if (usbsw->mansw) {

				fsa9480_write_reg(client,

					FSA9480_REG_MANSW1, usbsw->mansw);

			}

		}



		/* UART */

		if (val1 & DEV_T1_UART_MASK || val2 & DEV_T2_UART_MASK) {

			if (pdata->uart_cb)

				pdata->uart_cb(FSA9480_ATTACHED);



			if (!(ctrl & CON_MANUAL_SW)) {

				fsa9480_write_reg(client,

					FSA9480_REG_MANSW1, SW_UART);

			}

		}



		/* CHARGER */

		if (val1 & DEV_T1_CHARGER_MASK) {

			if (pdata->charger_cb)

				pdata->charger_cb(FSA9480_ATTACHED);

		}



		/* JIG */

		if (val2 & DEV_T2_JIG_MASK) {

			if (pdata->jig_cb)

				pdata->jig_cb(FSA9480_ATTACHED);

		}

	} else if (intr & INT_DETACH) {	/* Detached */

		/* USB */

		if (usbsw->dev1 & DEV_T1_USB_MASK ||

			usbsw->dev2 & DEV_T2_USB_MASK) {

			if (pdata->usb_cb)

				pdata->usb_cb(FSA9480_DETACHED);

		}



		/* UART */

		if (usbsw->dev1 & DEV_T1_UART_MASK ||

			usbsw->dev2 & DEV_T2_UART_MASK) {

			if (pdata->uart_cb)

				pdata->uart_cb(FSA9480_DETACHED);

		}



		/* CHARGER */

		if (usbsw->dev1 & DEV_T1_CHARGER_MASK) {

			if (pdata->charger_cb)

				pdata->charger_cb(FSA9480_DETACHED);

		}



		/* JIG */

		if (usbsw->dev2 & DEV_T2_JIG_MASK) {

			if (pdata->jig_cb)

				pdata->jig_cb(FSA9480_DETACHED);

		}

	}



	usbsw->dev1 = val1;

	usbsw->dev2 = val2;



out:

	ctrl &= ~CON_INT_MASK;

	fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);

}



static irqreturn_t fsa9480_irq_handler(int irq, void *data)

{

	struct fsa9480_usbsw *usbsw = data;

	struct i2c_client *client = usbsw->client;

	int intr;



	/* clear interrupt */

	fsa9480_read_irq(client, &intr);



	/* device detection */

	fsa9480_detect_dev(usbsw, intr);



	return IRQ_HANDLED;

}



static int fsa9480_irq_init(struct fsa9480_usbsw *usbsw)

{

	struct fsa9480_platform_data *pdata = usbsw->pdata;

	struct i2c_client *client = usbsw->client;

	int ret;

	int intr;

	unsigned int ctrl = CON_MASK;



	/* clear interrupt */

	fsa9480_read_irq(client, &intr);



	/* unmask interrupt (attach/detach only) */

	fsa9480_write_reg(client, FSA9480_REG_INT1_MASK, 0xfc);

	fsa9480_write_reg(client, FSA9480_REG_INT2_MASK, 0x1f);



	usbsw->mansw = fsa9480_read_reg(client, FSA9480_REG_MANSW1);



	if (usbsw->mansw)

		ctrl &= ~CON_MANUAL_SW;	/* Manual Switching Mode */



	fsa9480_write_reg(client, FSA9480_REG_CTRL, ctrl);



	if (pdata && pdata->cfg_gpio)

		pdata->cfg_gpio();



	if (client->irq) {

		ret = request_threaded_irq(client->irq, NULL,

				fsa9480_irq_handler,

				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,

				"fsa9480 micro USB", usbsw);

		if (ret) {

			dev_err(&client->dev, "failed to reqeust IRQ\n");

			return ret;

		}



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

	}



	return 0;

}



static int __devinit fsa9480_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{

	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);

	struct fsa9480_usbsw *usbsw;

	int ret = 0;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -EIO;



	usbsw = kzalloc(sizeof(struct fsa9480_usbsw), GFP_KERNEL);

	if (!usbsw) {

		dev_err(&client->dev, "failed to allocate driver data\n");

		return -ENOMEM;

	}



	usbsw->client = client;

	usbsw->pdata = client->dev.platform_data;



	chip = usbsw;



	i2c_set_clientdata(client, usbsw);



	ret = fsa9480_irq_init(usbsw);

	if (ret)

		goto fail1;



	ret = sysfs_create_group(&client->dev.kobj, &fsa9480_group);

	if (ret) {

		dev_err(&client->dev,

				"failed to create fsa9480 attribute group\n");

		goto fail2;

	}



	/* ADC Detect Time: 500ms */

	fsa9480_write_reg(client, FSA9480_REG_TIMING1, 0x6);



	if (chip->pdata->reset_cb)

		chip->pdata->reset_cb();



	/* device detection */

	fsa9480_detect_dev(usbsw, INT_ATTACH);



	pm_runtime_set_active(&client->dev);



	return 0;



fail2:

	if (client->irq)

		free_irq(client->irq, NULL);

fail1:

	i2c_set_clientdata(client, NULL);

	kfree(usbsw);

	return ret;

}



static int __devexit fsa9480_remove(struct i2c_client *client)

{

	struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);

	if (client->irq)

		free_irq(client->irq, NULL);

	i2c_set_clientdata(client, NULL);



	sysfs_remove_group(&client->dev.kobj, &fsa9480_group);

	device_init_wakeup(&client->dev, 0);

	kfree(usbsw);

	return 0;

}



#ifdef CONFIG_PM



static int fsa9480_suspend(struct i2c_client *client, pm_message_t state)

{

	struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);

	struct fsa9480_platform_data *pdata = usbsw->pdata;



	if (device_may_wakeup(&client->dev) && client->irq)

		enable_irq_wake(client->irq);



	if (pdata->usb_power)

		pdata->usb_power(0);



	return 0;

}



static int fsa9480_resume(struct i2c_client *client)

{

	struct fsa9480_usbsw *usbsw = i2c_get_clientdata(client);

	int dev1, dev2;



	if (device_may_wakeup(&client->dev) && client->irq)

		disable_irq_wake(client->irq);



	/*

	 * Clear Pending interrupt. Note that detect_dev does what

	 * the interrupt handler does. So, we don't miss pending and

	 * we reenable interrupt if there is one.

	 */

	fsa9480_read_reg(client, FSA9480_REG_INT1);

	fsa9480_read_reg(client, FSA9480_REG_INT2);



	dev1 = fsa9480_read_reg(client, FSA9480_REG_DEV_T1);

	dev2 = fsa9480_read_reg(client, FSA9480_REG_DEV_T2);



	/* device detection */

	fsa9480_detect_dev(usbsw, (dev1 || dev2) ? INT_ATTACH : INT_DETACH);



	return 0;

}



#else



#define fsa9480_suspend NULL

#define fsa9480_resume NULL



#endif /* CONFIG_PM */



static const struct i2c_device_id fsa9480_id[] = {

	{"fsa9480", 0},

	{}

};

MODULE_DEVICE_TABLE(i2c, fsa9480_id);



static struct i2c_driver fsa9480_i2c_driver = {

	.driver = {

		.name = "fsa9480",

	},

	.probe = fsa9480_probe,

	.remove = __devexit_p(fsa9480_remove),

	.resume = fsa9480_resume,

	.suspend = fsa9480_suspend,

	.id_table = fsa9480_id,

};



static int __init fsa9480_init(void)

{

	return i2c_add_driver(&fsa9480_i2c_driver);

}

module_init(fsa9480_init);



static void __exit fsa9480_exit(void)

{

	i2c_del_driver(&fsa9480_i2c_driver);

}

module_exit(fsa9480_exit);



MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");

MODULE_DESCRIPTION("FSA9480 USB Switch driver");

MODULE_LICENSE("GPL");

include/linux/platform_data/fsa9480.h

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/*

 * Copyright (C) 2010 Samsung Electronics

 * Minkyu Kang <mk7.kang@samsung.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.

 */



#ifndef _FSA9480_H_

#define _FSA9480_H_



#define FSA9480_ATTACHED	1

#define FSA9480_DETACHED	0



struct fsa9480_platform_data {

	void (*cfg_gpio) (void);

	void (*usb_cb) (u8 attached);

	void (*uart_cb) (u8 attached);

	void (*charger_cb) (u8 attached);

	void (*jig_cb) (u8 attached);

	void (*reset_cb) (void);

	void (*usb_power) (u8 on);

	int wakeup;

};



#endif /* _FSA9480_H_ */

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