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SubjectRe: [PATCH 1/2] usb: core: add vendor hook for usb suspend and resume
On Wed, Dec 14, 2022 at 3:07 PM Puma Hsu <pumahsu@google.com> wrote:
>
> Add the hooks that vendor can design and bypass the suspend/resume.
> When the handled is set, skip the original suspend/resume process.
>
> In mobile, a co-processor can be used for USB audio. When the co-processor
> is working for USB audio, the co-processor is the user/owner of the USB
> driver, and the ACPU is able to sleep in such condition to improve power
> consumption. In original process, the ACPU will suspend/resume until the
> USB suspend/resume. We add the hooks, so we can control USB suspend/resume
> without affecting the ACPU.
>
> Signed-off-by: Puma Hsu <pumahsu@google.com>
> ---
> drivers/usb/core/Makefile | 2 +-
> drivers/usb/core/driver.c | 36 ++++++++++++++++++++++++++++++++++++
> drivers/usb/core/usb.h | 5 +++++
> 3 files changed, 42 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/core/Makefile b/drivers/usb/core/Makefile
> index 7d338e9c0657..f48f646cd874 100644
> --- a/drivers/usb/core/Makefile
> +++ b/drivers/usb/core/Makefile
> @@ -3,7 +3,7 @@
> # Makefile for USB Core files and filesystem
> #
>
> -usbcore-y := usb.o hub.o hcd.o urb.o message.o driver.o
> +usbcore-y := usb.o hub.o hcd.o urb.o message.o driver.o usb-hooks-impl-goog.o
> usbcore-y += config.o file.o buffer.o sysfs.o endpoint.o
> usbcore-y += devio.o notify.o generic.o quirks.o devices.o
> usbcore-y += phy.o port.o

Sorry I should not add usb-hooks-impl-goog to the makefile.
I will upload a version2

> diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
> index 7e7e119c253f..3d2cfb6c2277 100644
> --- a/drivers/usb/core/driver.c
> +++ b/drivers/usb/core/driver.c
> @@ -35,6 +35,25 @@
> #include "usb.h"
>
>
> +static struct usb_device_vendor_ops *usb_dev_vendor_ops;
> +
> +int usb_dev_register_vendor_ops(struct usb_device_vendor_ops *vendor_ops)
> +{
> + if (vendor_ops == NULL)
> + return -EINVAL;
> +
> + usb_dev_vendor_ops = vendor_ops;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(usb_dev_register_vendor_ops);
> +
> +struct usb_device_vendor_ops *usb_vendor_get_ops(void)
> +{
> + return usb_dev_vendor_ops;
> +}
> +EXPORT_SYMBOL_GPL(usb_vendor_get_ops);
> +
> +
> /*
> * Adds a new dynamic USBdevice ID to this driver,
> * and cause the driver to probe for all devices again.
> @@ -1400,11 +1419,19 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
> int status = 0;
> int i = 0, n = 0;
> struct usb_interface *intf;
> + bool handled;
> + struct usb_device_vendor_ops *ops = usb_vendor_get_ops();
>
> if (udev->state == USB_STATE_NOTATTACHED ||
> udev->state == USB_STATE_SUSPENDED)
> goto done;
>
> + if (ops && ops->usb_dev_suspend) {
> + handled = ops->usb_dev_suspend(udev, msg);
> + if (handled)
> + goto done;
> + }
> +
> /* Suspend all the interfaces and then udev itself */
> if (udev->actconfig) {
> n = udev->actconfig->desc.bNumInterfaces;
> @@ -1501,11 +1528,20 @@ static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
> int status = 0;
> int i;
> struct usb_interface *intf;
> + bool handled;
> + struct usb_device_vendor_ops *ops = usb_vendor_get_ops();
>
> if (udev->state == USB_STATE_NOTATTACHED) {
> status = -ENODEV;
> goto done;
> }
> +
> + if (ops && ops->usb_dev_resume) {
> + handled = ops->usb_dev_resume(udev, msg);
> + if (handled)
> + goto done;
> + }
> +
> udev->can_submit = 1;
>
> /* Resume the device */
> diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
> index 82538daac8b8..9ccb8683071d 100644
> --- a/drivers/usb/core/usb.h
> +++ b/drivers/usb/core/usb.h
> @@ -220,3 +220,8 @@ extern acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
> static inline int usb_acpi_register(void) { return 0; };
> static inline void usb_acpi_unregister(void) { };
> #endif
> +
> +struct usb_device_vendor_ops {
> + bool (*usb_dev_suspend)(struct usb_device *udev, pm_message_t msg);
> + bool (*usb_dev_resume)(struct usb_device *udev, pm_message_t msg);
> +};
> --
> 2.39.0.rc1.256.g54fd8350bd-goog
>

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