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Commit 9e666cce authored by Arumuga Durai A's avatar Arumuga Durai A
Browse files

USB: misc: Add usb2533 hub driver with flex mode support 



usb2533 HUB supports flex mode which allows swapping of upstream
port with one of the downstream port using I2C commands.
Add driver for the hub and enable/disable flex mode based on the
USB state (host/device).

CRs-Fixed: 2041232
Change-Id: I221edf3661e02fb368f99bbf6e8b247385ecabe0
Signed-off-by: default avatarArumuga Durai A <cadurai@codeaurora.org>
parent f5c81bb5

Documentation/devicetree/bindings/usb/usb2533-flex-hub.txt

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USB2533 flex Hub



usb2533 HUB supports flex mode which allows swapping of upstream port with

one of the downstream port using I2C commands. This driver enables/disables

flex mode based on the USB mode (host/device).



Required properties :

- compatible : Must be "qcom,usb2533-flex-hub"

- reg: 7bit I2C slave address

- <supply-name>-supply: handle to the regulator device tree node.

        "supply-name" is "vbus" regulator to drive peripheral Vbus

	line in host mode.



Optional properties:

- qcom,hub-reset-gpio : This corresponds to GPIO that is used to drive USB HUB

  reset pin.

- qcom,usbeth-reset-gpio : This corresponds to GPIO that is used to drive

  reset of any other downstream device connected to HUB.

  GPIO flag represents whether ENB pin is active-high(0) or active-low(1).



Example :

	usb2533@2d {

		compatible = "qcom,usb2533-flex-hub";

		reg = <0x2d>;

		vbus-supply = <&usbeth_vbus_vreg>;

		pinctrl-names = "default";

		pinctrl-0 = <&usb2533_hub_reset>;

		qcom,hub-reset-gpio = <&tlmm 100 0>;

		qcom,usbeth-reset-gpio = <&ioexp_gpios 5 0>;

	};

drivers/usb/misc/Kconfig

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@@ -249,6 +249,15 @@ config USB_HSIC_USB3503 
       help

         This option enables support for SMSC USB3503 HSIC to USB 2.0 Driver.



config MICROCHIP_USB2533

	tristate "Microchip USB2533 HUB Driver"

	depends on I2C

	help

	  This option enables support for Microchip USB2533 HUB Driver.

	  It supports swapping of upstream and downstream HUB ports by

	  enabling flexmode in usb hub using I2C. Also supply VBUS and

	  do reset the peripherals which are connect to the USB2533 HUB.



config USB_LINK_LAYER_TEST

	tristate "USB Link Layer Test driver"

	help

drivers/usb/misc/Makefile

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@@ -25,6 +25,7 @@ obj-$(CONFIG_USB_USS720) += uss720.o 
obj-$(CONFIG_USB_SEVSEG)		+= usbsevseg.o

obj-$(CONFIG_USB_YUREX)			+= yurex.o

obj-$(CONFIG_USB_HSIC_USB3503)		+= usb3503.o

obj-$(CONFIG_MICROCHIP_USB2533)		+= usb2533.o



obj-$(CONFIG_USB_SISUSBVGA)		+= sisusbvga/

obj-$(CONFIG_USB_LINK_LAYER_TEST)	+= lvstest.o

drivers/usb/misc/usb2533.c

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/* Copyright (c) 2017, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * 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/i2c.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/of_gpio.h>

#include <linux/of_platform.h>

#include <linux/interrupt.h>

#include <linux/regulator/consumer.h>

#include <linux/usb/class-dual-role.h>

#include <linux/usb.h>

#include <linux/usb/msm_hsusb.h>



#define USB_HUB_I2C_NAME	"usb2533-flex-hub"



static u8 write_connect_cfg[] = {0x00, 0x00, 0x05, 0x00, 0x02,

						0x31, 0x8E, 0x83};

static u8 conf_access[] = {0x99, 0x37, 0x00};

static u8 read_connect_cfg[] = {0x00, 0x00, 0x04, 0x01, 0x01, 0x31, 0x8E};

static u8 read_cmd[] = {0x00, 0x04};

static u8 usb_attach[] = {0xAA, 0x55, 0x00};



struct flex_hub {

	struct i2c_client	*client;

	struct  device		*dev;

	struct regulator	*vbus_det;

	struct notifier_block	usbdev_nb;

	int			hub_reset_gpio;

	int			usbeth_reset_gpio;

};

static struct flex_hub *usb_hub;



static int hub_read_regdata(struct i2c_client *i2c)

{

	int rc;

	u8 data[3];



	struct i2c_msg msgs[] = {

		{

			.addr  = i2c->addr,

			.flags = I2C_M_RD,

			.len   = 3,

			.buf   = data,

		}

	};



	rc = i2c_transfer(i2c->adapter, msgs, 1);

	if (rc < 0) {

		dev_dbg(&i2c->dev, "i2c read from 0x%x failed %d\n",

			i2c->addr, rc);

		return -ENXIO;

	}



	return rc;

}



static int hub_i2c_write(struct flex_hub *usb_hub, u8 *data, int len)

{

	int ret;



	struct i2c_msg msgs[] = {

		{

		.addr  = usb_hub->client->addr,

		.flags = 0,

		.len   = len,

		.buf   = data,

		}

	};

	ret = i2c_transfer(usb_hub->client->adapter, msgs, 1);

	if (ret != 1) {

		pr_err("i2c write to [%x] failed %d\n",

			usb_hub->client->addr, ret);

		return -EIO;

	}



	return 0;

}



int i2c_hub_attach(void)

{

	if (hub_i2c_write(usb_hub, usb_attach, sizeof(usb_attach))) {

		pr_err("%s usb_attach failed\n", __func__);

		return -EIO;

	}



	return 0;

}

EXPORT_SYMBOL(i2c_hub_attach);



int i2c_hub_flex_enable(struct flex_hub *usb_hub)

{

	int ret;



	if (hub_i2c_write(usb_hub, write_connect_cfg,

			sizeof(write_connect_cfg))) {

		pr_err("%s write_connect_cfg cmd failed\n", __func__);

		return -EIO;

	}



	if (hub_i2c_write(usb_hub, conf_access, sizeof(conf_access))) {

		pr_err("%s conf_access cmd failed\n", __func__);

		return -EIO;

	}



	if (hub_i2c_write(usb_hub, read_connect_cfg,

			sizeof(read_connect_cfg))) {

		pr_err("%s read_connect cmd failed\n", __func__);

		return -EIO;

	}



	if (hub_i2c_write(usb_hub, conf_access, sizeof(conf_access))) {

		pr_err("%s conf_access cmd failed\n", __func__);

		return -EIO;

	}



	if (hub_i2c_write(usb_hub, read_cmd, sizeof(read_cmd))) {

		pr_err("%s read_cmd failed\n", __func__);

		return -EIO;

	}



	ret = hub_read_regdata(usb_hub->client);

	if (ret < 0) {

		pr_err("read_regdata failed\n");

		return -EIO;

	}



	/*

	 * After the read/write of USB2533 HUB's configuration register,

	 * We need to wait for 300ms before doing USB_ATTACH(special command).

	 */

	msleep(300);

	if (hub_i2c_write(usb_hub, usb_attach, sizeof(usb_attach))) {

		pr_err("%s usb_attach cmd failed\n", __func__);

		return -EIO;

	}



	return 0;

}

EXPORT_SYMBOL(i2c_hub_flex_enable);



static int flex_hub_usbdev_notify(struct notifier_block *self,

			unsigned long action, void *priv)

{

	static bool flex_enabled;



	pr_debug("%s: action:%lu flex:%d\n", __func__, action, flex_enabled);



	if (action != USB_BUS_ADD && action != USB_BUS_REMOVE)

		return 0;



	switch (action) {

	case USB_BUS_ADD:

		if (flex_enabled) {

			pr_debug("%s: already flexconnect enabled\n", __func__);

			break;

		}



		if (gpio_is_valid(usb_hub->hub_reset_gpio)) {

			gpio_direction_output(

				usb_hub->hub_reset_gpio, 0);

			/* 5 microsecs reset signaling to hub */

			usleep_range(5, 10);

			gpio_direction_output(

				usb_hub->hub_reset_gpio, 1);

		}

		if (gpio_is_valid(usb_hub->usbeth_reset_gpio)) {

			gpio_direction_output(

				usb_hub->usbeth_reset_gpio, 0);

			/* 100 microsecs reset signaling to LAN7500 */

			usleep_range(100, 110);

			gpio_direction_output(

				usb_hub->usbeth_reset_gpio, 1);

		}



		/*

		 * After HUB Reset, We need to wait for 300ms in

		 * SOC config stage before doing read/write of

		 * USB2533 HUB's configuration register

		 */

		msleep(300);

		i2c_hub_flex_enable(usb_hub);

		flex_enabled = true;

		break;



	case USB_BUS_REMOVE:

		if (!flex_enabled) {

			pr_debug("%s: already flexconnect disabled\n",

				__func__);

			break;

		}



		if (gpio_is_valid(usb_hub->hub_reset_gpio)) {

			gpio_direction_output(

				usb_hub->hub_reset_gpio, 0);

			/* 5 microsecs reset signaling to usb hub */

			usleep_range(5, 10);

			gpio_direction_output(

				usb_hub->hub_reset_gpio, 1);

		}

		msleep(300);

		i2c_hub_attach();

		flex_enabled = false;

		break;



	default:

		break;

	}



	return 0;

}



static int usb2533_probe(struct i2c_client *i2c,

				const struct i2c_device_id *id)

{

	int ret = 0;

	struct device_node *node = i2c->dev.of_node;



	usb_hub = devm_kzalloc(&i2c->dev, sizeof(struct flex_hub),

				GFP_KERNEL);



	if (!usb_hub)

		return -ENOMEM;



	i2c_set_clientdata(i2c, usb_hub);

	usb_hub->client = i2c;

	usb_hub->dev = &usb_hub->client->dev;



	usb_hub->vbus_det = devm_regulator_get(usb_hub->dev, "vbus");

	if (IS_ERR(usb_hub->vbus_det)) {

		dev_err(usb_hub->dev, "Failed to get regulator: %ld\n",

			PTR_ERR(usb_hub->vbus_det));

		return PTR_ERR(usb_hub->vbus_det);

	}



	ret = regulator_enable(usb_hub->vbus_det);

	if (ret) {

		pr_err("unable to enable vbus_det\n");

		return ret;

	}



	usb_hub->hub_reset_gpio = of_get_named_gpio(

			node, "qcom,hub-reset-gpio", 0);

	if (usb_hub->hub_reset_gpio < 0)

		pr_debug("hub_reset_gpio is not available\n");



	usb_hub->usbeth_reset_gpio = of_get_named_gpio(

			node, "qcom,usbeth-reset-gpio", 0);

	if (usb_hub->usbeth_reset_gpio < 0)

		pr_debug("usbeth_reset_gpio is not available\n");



	if (gpio_is_valid(usb_hub->hub_reset_gpio)) {

		ret = devm_gpio_request(usb_hub->dev,

				usb_hub->hub_reset_gpio, "HUB_RESET");

		if (ret < 0) {

			dev_err(usb_hub->dev, "gpio req failed for hub_reset\n");

			return ret;

		}

	}



	if (gpio_is_valid(usb_hub->usbeth_reset_gpio)) {

		ret = devm_gpio_request(usb_hub->dev,

				usb_hub->usbeth_reset_gpio, "ETH_RESET");

		if (ret < 0) {

			dev_err(usb_hub->dev, "gpio req failed for usbeth_reset\n");

			return ret;

		}

	}



	usb_hub->usbdev_nb.notifier_call = flex_hub_usbdev_notify;

	usb_register_notify(&usb_hub->usbdev_nb);



	return 0;

}



static int usb2533_remove(struct i2c_client *i2c)

{

	struct flex_hub *usb_hub = i2c_get_clientdata(i2c);



	usb_unregister_notify(&usb_hub->usbdev_nb);

	devm_kfree(&i2c->dev, usb_hub);



	return 0;

}



static const struct i2c_device_id usb2533_flex_hub_id[] = {

	{ USB_HUB_I2C_NAME, 0 },

	{ }

};

MODULE_DEVICE_TABLE(i2c, flex_hub_id);



static const struct of_device_id flex_hub_of_match[] = {

	{ .compatible = "qcom,usb2533-flex-hub", },

	{},

};

MODULE_DEVICE_TABLE(of, flex_hub_of_match);



static struct i2c_driver flex_hub_driver = {

	.probe		= usb2533_probe,

	.remove		= usb2533_remove,

	.id_table	= usb2533_flex_hub_id,

	.driver = {

		.name = USB_HUB_I2C_NAME,

		.of_match_table = flex_hub_of_match,

	},

};



module_i2c_driver(flex_hub_driver);



MODULE_DESCRIPTION("Microchip USB2533 Flex Hub driver");

MODULE_LICENSE("GPL v2");