Hi,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> writes:
> 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: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> .../ABI/testing/sysfs-platform-renesas_usb3 | 15 ++++++
> drivers/usb/gadget/udc/renesas_usb3.c | 56 ++++++++++++++++++++++
> 2 files changed, 71 insertions(+)
> create mode 100644 Documentation/ABI/testing/sysfs-platform-renesas_usb3
>
> diff --git a/Documentation/ABI/testing/sysfs-platform-renesas_usb3 b/Documentation/ABI/testing/sysfs-platform-renesas_usb3
> new file mode 100644
> index 0000000..1f63190
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-platform-renesas_usb3
> @@ -0,0 +1,15 @@
> +What: /sys/devices/platform/<udc-name>/role
I have one question here. This seems to imply that platform devices have
a "role" file which is not true for all platforms devices. I really
don't have a suggestion as to how this could/should be written out,
though :-s
Greg, any suggestions?
(keeping patch below for reference only)
> +Date: March 2017
> +KernelVersion: 4.13
> +Contact: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> +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.
> diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
> index a1e79fc..5a2d845 100644
> --- a/drivers/usb/gadget/udc/renesas_usb3.c
> +++ b/drivers/usb/gadget/udc/renesas_usb3.c
> @@ -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 int renesas_usb3_set_selfpowered(struct usb_gadget *gadget, int is_self)
> .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);
>
> --
> 1.9.1
>
> --
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--
balbi
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