Commit cc995c9e authored by Yoshihiro Shimoda's avatar Yoshihiro Shimoda Committed by Felipe Balbi
Browse files

usb: gadget: udc: renesas_usb3: add support for usb role swap 



This patch adds support for usb role swap via sysfs "role".

For example:
 1) Connect a usb cable using 2 Salvator-X boards.
  - For A-Device, the cable is connected to CN11 (USB3.0 ch0).
  - For B-Device, the cable is connected to CN9 (USB2.0 ch0).
 2) On A-Device, you input the following command:
  # echo peripheral > /sys/devices/platform/soc/ee020000.usb/role
 3) On B-Device, you input the following command:
  # echo host > /sys/devices/platform/soc/ee080200.usb-phy/role

Then, the A-Device acts as a peripheral and the B-Device acts as
a host. Please note that A-Device must input the following command
if you want the board to act as a host again.
 # echo host > /sys/devices/platform/soc/ee020000.usb/role

Signed-off-by: default avatarYoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent fbf4987a

Documentation/ABI/testing/sysfs-platform-renesas_usb3

0 → 100644
+15 −0
Original line number Diff line number Diff line 
What:		/sys/devices/platform/<renesas_usb3's name>/role

Date:		March 2017

KernelVersion:	4.13

Contact:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

Description:

		This file can be read and write.

		The file can show/change the drd mode of usb.



		Write the following string to change the mode:

		 "host" - switching mode from peripheral to host.

		 "peripheral" - switching mode from host to peripheral.



		Read the file, then it shows the following strings:

		 "host" - The mode is host now.

		 "peripheral" - The mode is peripheral now.

drivers/usb/gadget/udc/renesas_usb3.c

+56 −0
Original line number Diff line number Diff line
@@ -372,6 +372,11 @@ static void usb3_disable_pipe_irq(struct renesas_usb3 *usb3, int num) 
	usb3_clear_bit(usb3, USB_INT_2_PIPE(num), USB3_USB_INT_ENA_2);

}



static bool usb3_is_host(struct renesas_usb3 *usb3)

{

	return !(usb3_read(usb3, USB3_DRD_CON) & DRD_CON_PERI_CON);

}



static void usb3_init_axi_bridge(struct renesas_usb3 *usb3)

{

	/* Set AXI_INT */
@@ -576,8 +581,14 @@ static void usb3_vbus_out(struct renesas_usb3 *usb3, bool enable) 


static void usb3_mode_config(struct renesas_usb3 *usb3, bool host, bool a_dev)

{

	unsigned long flags;



	spin_lock_irqsave(&usb3->lock, flags);

	usb3_set_mode(usb3, host);

	usb3_vbus_out(usb3, a_dev);

	if (!host && a_dev)		/* for A-Peripheral */

		usb3_connect(usb3);

	spin_unlock_irqrestore(&usb3->lock, flags);

}



static bool usb3_is_a_device(struct renesas_usb3 *usb3)
@@ -1837,11 +1848,49 @@ static const struct usb_gadget_ops renesas_usb3_gadget_ops = { 
	.set_selfpowered	= renesas_usb3_set_selfpowered,

};



static ssize_t role_store(struct device *dev, struct device_attribute *attr,

			  const char *buf, size_t count)

{

	struct renesas_usb3 *usb3 = dev_get_drvdata(dev);

	bool new_mode_is_host;



	if (!usb3->driver)

		return -ENODEV;



	if (!strncmp(buf, "host", strlen("host")))

		new_mode_is_host = true;

	else if (!strncmp(buf, "peripheral", strlen("peripheral")))

		new_mode_is_host = false;

	else

		return -EINVAL;



	if (new_mode_is_host == usb3_is_host(usb3))

		return -EINVAL;



	usb3_mode_config(usb3, new_mode_is_host, usb3_is_a_device(usb3));



	return count;

}



static ssize_t role_show(struct device *dev, struct device_attribute *attr,

			 char *buf)

{

	struct renesas_usb3 *usb3 = dev_get_drvdata(dev);



	if (!usb3->driver)

		return -ENODEV;



	return sprintf(buf, "%s\n", usb3_is_host(usb3) ? "host" : "peripheral");

}

static DEVICE_ATTR_RW(role);



/*------- platform_driver ------------------------------------------------*/

static int renesas_usb3_remove(struct platform_device *pdev)

{

	struct renesas_usb3 *usb3 = platform_get_drvdata(pdev);



	device_remove_file(&pdev->dev, &dev_attr_role);



	pm_runtime_put(&pdev->dev);

	pm_runtime_disable(&pdev->dev);
@@ -2044,6 +2093,10 @@ static int renesas_usb3_probe(struct platform_device *pdev) 
	if (ret < 0)

		goto err_add_udc;



	ret = device_create_file(&pdev->dev, &dev_attr_role);

	if (ret < 0)

		goto err_dev_create;



	usb3->workaround_for_vbus = priv->workaround_for_vbus;



	pm_runtime_enable(&pdev->dev);
@@ -2053,6 +2106,9 @@ static int renesas_usb3_probe(struct platform_device *pdev) 


	return 0;



err_dev_create:

	usb_del_gadget_udc(&usb3->gadget);



err_add_udc:

	__renesas_usb3_ep_free_request(usb3->ep0_req);

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