Commit bad5b5e7 authored by Tomasz Figa's avatar Tomasz Figa Committed by Chanwoo Choi
Browse files

extcon: Add fsa9480 extcon driver 



This patch adds extcon driver for Fairchild Semiconductor FSA9480
microUSB switch.

Signed-off-by: default avatarTomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: default avatarJonathan Bakker <xc-racer2@live.ca>
Signed-off-by: default avatarPaweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
parent fd757dba

drivers/extcon/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -37,6 +37,18 @@ config EXTCON_AXP288 
	  Say Y here to enable support for USB peripheral detection

	  and USB MUX switching by X-Power AXP288 PMIC.



config EXTCON_FSA9480

	tristate "FSA9480 EXTCON Support"

	depends on INPUT

	select IRQ_DOMAIN

	select REGMAP_I2C

	help

	  If you say yes here you get support for the Fairchild Semiconductor

	  FSA9480 microUSB switch and accessory detector chip. 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.



config EXTCON_GPIO

	tristate "GPIO extcon support"

	depends on GPIOLIB || COMPILE_TEST

drivers/extcon/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ extcon-core-objs += extcon.o devres.o 
obj-$(CONFIG_EXTCON_ADC_JACK)	+= extcon-adc-jack.o

obj-$(CONFIG_EXTCON_ARIZONA)	+= extcon-arizona.o

obj-$(CONFIG_EXTCON_AXP288)	+= extcon-axp288.o

obj-$(CONFIG_EXTCON_FSA9480)	+= extcon-fsa9480.o

obj-$(CONFIG_EXTCON_GPIO)	+= extcon-gpio.o

obj-$(CONFIG_EXTCON_INTEL_INT3496) += extcon-intel-int3496.o

obj-$(CONFIG_EXTCON_INTEL_CHT_WC) += extcon-intel-cht-wc.o

drivers/extcon/extcon-fsa9480.c

0 → 100644
+395 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 * extcon-fsa9480.c - Fairchild Semiconductor FSA9480 extcon driver

 *

 * Copyright (c) 2019 Tomasz Figa <tomasz.figa@gmail.com>

 *

 * Loosely based on old fsa9480 misc-device driver.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/types.h>

#include <linux/i2c.h>

#include <linux/slab.h>

#include <linux/bitops.h>

#include <linux/interrupt.h>

#include <linux/err.h>

#include <linux/platform_device.h>

#include <linux/kobject.h>

#include <linux/extcon-provider.h>

#include <linux/irqdomain.h>

#include <linux/regmap.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

#define FSA9480_REG_END                 0x15



/* 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             7

#define DEV_DEDICATED_CHG       6

#define DEV_USB_CHG             5

#define DEV_CAR_KIT             4

#define DEV_UART                3

#define DEV_USB                 2

#define DEV_AUDIO_2             1

#define DEV_AUDIO_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                  14

#define DEV_TTY                 13

#define DEV_PPD                 12

#define DEV_JIG_UART_OFF        11

#define DEV_JIG_UART_ON         10

#define DEV_JIG_USB_OFF         9

#define DEV_JIG_USB_ON          8



#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 INT1_MASK               (0xff << 0)

#define INT_DETACH              (1 << 1)

#define INT_ATTACH              (1 << 0)



/* Interrupt 2 mask */

#define INT2_MASK               (0x1f << 0)



/* Timing Set 1 */

#define TIMING1_ADC_500MS       (0x6 << 0)



struct fsa9480_usbsw {

	struct device *dev;

	struct regmap *regmap;

	struct extcon_dev *edev;

	u16 cable;

};



static const unsigned int fsa9480_extcon_cable[] = {

	EXTCON_USB_HOST,

	EXTCON_USB,

	EXTCON_CHG_USB_DCP,

	EXTCON_CHG_USB_SDP,

	EXTCON_CHG_USB_ACA,

	EXTCON_JACK_LINE_OUT,

	EXTCON_JACK_VIDEO_OUT,

	EXTCON_JIG,



	EXTCON_NONE,

};



static const u64 cable_types[] = {

	[DEV_USB_OTG] = BIT_ULL(EXTCON_USB_HOST),

	[DEV_DEDICATED_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_DCP),

	[DEV_USB_CHG] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),

	[DEV_CAR_KIT] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP)

			| BIT_ULL(EXTCON_JACK_LINE_OUT),

	[DEV_UART] = BIT_ULL(EXTCON_JIG),

	[DEV_USB] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_CHG_USB_SDP),

	[DEV_AUDIO_2] = BIT_ULL(EXTCON_JACK_LINE_OUT),

	[DEV_AUDIO_1] = BIT_ULL(EXTCON_JACK_LINE_OUT),

	[DEV_AV] = BIT_ULL(EXTCON_JACK_LINE_OUT)

		   | BIT_ULL(EXTCON_JACK_VIDEO_OUT),

	[DEV_TTY] = BIT_ULL(EXTCON_JIG),

	[DEV_PPD] = BIT_ULL(EXTCON_JACK_LINE_OUT) | BIT_ULL(EXTCON_CHG_USB_ACA),

	[DEV_JIG_UART_OFF] = BIT_ULL(EXTCON_JIG),

	[DEV_JIG_UART_ON] = BIT_ULL(EXTCON_JIG),

	[DEV_JIG_USB_OFF] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),

	[DEV_JIG_USB_ON] = BIT_ULL(EXTCON_USB) | BIT_ULL(EXTCON_JIG),

};



/* Define regmap configuration of FSA9480 for I2C communication  */

static bool fsa9480_volatile_reg(struct device *dev, unsigned int reg)

{

	switch (reg) {

	case FSA9480_REG_INT1_MASK:

		return true;

	default:

		break;

	}

	return false;

}



static const struct regmap_config fsa9480_regmap_config = {

	.reg_bits	= 8,

	.val_bits	= 8,

	.volatile_reg	= fsa9480_volatile_reg,

	.max_register	= FSA9480_REG_END,

};



static int fsa9480_write_reg(struct fsa9480_usbsw *usbsw, int reg, int value)

{

	int ret;



	ret = regmap_write(usbsw->regmap, reg, value);

	if (ret < 0)

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



	return ret;

}



static int fsa9480_read_reg(struct fsa9480_usbsw *usbsw, int reg)

{

	int ret, val;



	ret = regmap_read(usbsw->regmap, reg, &val);

	if (ret < 0) {

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

		return ret;

	}



	return val;

}



static int fsa9480_read_irq(struct fsa9480_usbsw *usbsw, int *value)

{

	u8 regs[2];

	int ret;



	ret = regmap_bulk_read(usbsw->regmap, FSA9480_REG_INT1, regs, 2);

	if (ret < 0)

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



	*value = regs[1] << 8 | regs[0];

	return ret;

}



static void fsa9480_handle_change(struct fsa9480_usbsw *usbsw,

				  u16 mask, bool attached)

{

	while (mask) {

		int dev = fls64(mask) - 1;

		u64 cables = cable_types[dev];



		while (cables) {

			int cable = fls64(cables) - 1;



			extcon_set_state_sync(usbsw->edev, cable, attached);

			cables &= ~BIT_ULL(cable);

		}



		mask &= ~BIT_ULL(dev);

	}

}



static void fsa9480_detect_dev(struct fsa9480_usbsw *usbsw)

{

	int val1, val2;

	u16 val;



	val1 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T1);

	val2 = fsa9480_read_reg(usbsw, FSA9480_REG_DEV_T2);

	if (val1 < 0 || val2 < 0) {

		dev_err(usbsw->dev, "%s: failed to read registers", __func__);

		return;

	}

	val = val2 << 8 | val1;



	dev_info(usbsw->dev, "dev1: 0x%x, dev2: 0x%x\n", val1, val2);



	/* handle detached cables first */

	fsa9480_handle_change(usbsw, usbsw->cable & ~val, false);



	/* then handle attached ones */

	fsa9480_handle_change(usbsw, val & ~usbsw->cable, true);



	usbsw->cable = val;

}



static irqreturn_t fsa9480_irq_handler(int irq, void *data)

{

	struct fsa9480_usbsw *usbsw = data;

	int intr = 0;



	/* clear interrupt */

	fsa9480_read_irq(usbsw, &intr);

	if (!intr)

		return IRQ_NONE;



	/* device detection */

	fsa9480_detect_dev(usbsw);



	return IRQ_HANDLED;

}



static int fsa9480_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{

	struct fsa9480_usbsw *info;

	int ret;



	if (!client->irq) {

		dev_err(&client->dev, "no interrupt provided\n");

		return -EINVAL;

	}



	info = devm_kzalloc(&client->dev, sizeof(*info), GFP_KERNEL);

	if (!info)

		return -ENOMEM;

	info->dev = &client->dev;



	i2c_set_clientdata(client, info);



	/* External connector */

	info->edev = devm_extcon_dev_allocate(info->dev,

					      fsa9480_extcon_cable);

	if (IS_ERR(info->edev)) {

		dev_err(info->dev, "failed to allocate memory for extcon\n");

		ret = -ENOMEM;

		return ret;

	}



	ret = devm_extcon_dev_register(info->dev, info->edev);

	if (ret) {

		dev_err(info->dev, "failed to register extcon device\n");

		return ret;

	}



	info->regmap = devm_regmap_init_i2c(client, &fsa9480_regmap_config);

	if (IS_ERR(info->regmap)) {

		ret = PTR_ERR(info->regmap);

		dev_err(info->dev, "failed to allocate register map: %d\n",

			ret);

		return ret;

	}



	/* ADC Detect Time: 500ms */

	fsa9480_write_reg(info, FSA9480_REG_TIMING1, TIMING1_ADC_500MS);



	/* configure automatic switching */

	fsa9480_write_reg(info, FSA9480_REG_CTRL, CON_MASK);



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

	fsa9480_write_reg(info, FSA9480_REG_INT1_MASK,

			  INT1_MASK & ~(INT_ATTACH | INT_DETACH));

	fsa9480_write_reg(info, FSA9480_REG_INT2_MASK, INT2_MASK);



	ret = devm_request_threaded_irq(info->dev, client->irq, NULL,

					fsa9480_irq_handler,

					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,

					"fsa9480", info);

	if (ret) {

		dev_err(info->dev, "failed to request IRQ\n");

		return ret;

	}



	device_init_wakeup(info->dev, true);

	fsa9480_detect_dev(info);



	return 0;

}



static int fsa9480_remove(struct i2c_client *client)

{

	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int fsa9480_suspend(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);



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

		enable_irq_wake(client->irq);



	return 0;

}



static int fsa9480_resume(struct device *dev)

{

	struct i2c_client *client = to_i2c_client(dev);



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

		disable_irq_wake(client->irq);



	return 0;

}

#endif



static const struct dev_pm_ops fsa9480_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(fsa9480_suspend, fsa9480_resume)

};



static const struct i2c_device_id fsa9480_id[] = {

	{ "fsa9480", 0 },

	{}

};

MODULE_DEVICE_TABLE(i2c, fsa9480_id);



static const struct of_device_id fsa9480_of_match[] = {

	{ .compatible = "fcs,fsa9480", },

	{ },

};

MODULE_DEVICE_TABLE(of, fsa9480_of_match);



static struct i2c_driver fsa9480_i2c_driver = {

	.driver			= {

		.name		= "fsa9480",

		.pm		= &fsa9480_pm_ops,

		.of_match_table = fsa9480_of_match,

	},

	.probe			= fsa9480_probe,

	.remove			= fsa9480_remove,

	.id_table		= fsa9480_id,

};



static int __init fsa9480_module_init(void)

{

	return i2c_add_driver(&fsa9480_i2c_driver);

}

subsys_initcall(fsa9480_module_init);



static void __exit fsa9480_module_exit(void)

{

	i2c_del_driver(&fsa9480_i2c_driver);

}

module_exit(fsa9480_module_exit);



MODULE_DESCRIPTION("Fairchild Semiconductor FSA9480 extcon driver");

MODULE_AUTHOR("Tomasz Figa <tomasz.figa@gmail.com>");

MODULE_LICENSE("GPL");