On Wed, 17 Jun 2015 13:43:45 +0800
Li Jun <jun.li@xxxxxxxxxxxxx> wrote:
> Allocate and initialize usb otg descriptor according to gadget otg
> capabilities, add it for each usb configurations, free it while
> composite unbind. If otg capability is not defined, keep its otg
there is no composite unbind in acm_ms.c.
> descriptor unchanged.
>
> Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
> ---
> drivers/usb/gadget/legacy/acm_ms.c | 29 ++++++++++++++---------------
> 1 file changed, 14 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/gadget/legacy/acm_ms.c b/drivers/usb/gadget/legacy/acm_ms.c
> index 1194b09..f9b7b31 100644
> --- a/drivers/usb/gadget/legacy/acm_ms.c
> +++ b/drivers/usb/gadget/legacy/acm_ms.c
> @@ -58,21 +58,7 @@ static struct usb_device_descriptor device_desc = {
> /*.bNumConfigurations = DYNAMIC*/
> };
>
> -static struct usb_otg_descriptor otg_descriptor = {
> - .bLength = sizeof otg_descriptor,
> - .bDescriptorType = USB_DT_OTG,
> -
> - /*
> - * REVISIT SRP-only hardware is possible, although
> - * it would not be called "OTG" ...
> - */
> - .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
> -};
> -
> -static const struct usb_descriptor_header *otg_desc[] = {
> - (struct usb_descriptor_header *) &otg_descriptor,
> - NULL,
> -};
> +static const struct usb_descriptor_header *otg_desc[2];
>
> /* string IDs are assigned dynamically */
> static struct usb_string strings_dev[] = {
> @@ -127,6 +113,16 @@ static int acm_ms_do_config(struct usb_configuration *c)
> int status;
>
> if (gadget_is_otg(c->cdev->gadget)) {
> + if (!otg_desc[0]) {
> + struct usb_descriptor_header *usb_desc;
> +
> + usb_desc = usb_otg_descriptor_alloc(c->cdev->gadget);
> + if (!usb_desc)
> + return -ENOMEM;
> + usb_otg_descriptor_init(c->cdev->gadget, usb_desc);
> + otg_desc[0] = usb_desc;
> + otg_desc[1] = NULL;
I think it is symmetric to put this code in acm_ms_bind()
as you are freeing the descriptor in acm_ms_unbind().
Same applies for all other gadgets as well.
> + }
> c->descriptors = otg_desc;
> c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
> }
> @@ -255,6 +251,9 @@ static int acm_ms_unbind(struct usb_composite_dev *cdev)
> usb_put_function_instance(fi_msg);
> usb_put_function(f_acm);
> usb_put_function_instance(f_acm_inst);
> + kfree(otg_desc[0]);
> + otg_desc[0] = NULL;
> +
> return 0;
> }
>
cheers,
-roger
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