On Tue, 16 Jun 2015 14:52:00 +0800
Li Jun <jun.li@xxxxxxxxxxxxx> wrote:
> Use usb_otg_descriptor_add to allocate and initialize usb_otg_descriptor,
> add it for each usb configurations, free it while composite unbind.
>
> Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
> ---
> drivers/usb/gadget/configfs.c | 34 +++++++++++++++++++++++++---------
> 1 file changed, 25 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
> index 0495c94..773b746 100644
> --- a/drivers/usb/gadget/configfs.c
> +++ b/drivers/usb/gadget/configfs.c
> @@ -41,6 +41,8 @@ int check_user_usb_string(const char *name,
> #define MAX_NAME_LEN 40
> #define MAX_USB_STRING_LANGS 2
>
> +static const struct usb_descriptor_header *otg_desc[2];
> +
> struct gadget_info {
> struct config_group group;
> struct config_group functions_group;
> @@ -55,9 +57,6 @@ struct gadget_info {
> struct list_head available_func;
>
> const char *udc_name;
> -#ifdef CONFIG_USB_OTG
> - struct usb_otg_descriptor otg;
> -#endif
> struct usb_composite_driver composite;
> struct usb_composite_dev cdev;
> bool use_os_desc;
> @@ -1376,6 +1375,24 @@ static int configfs_composite_bind(struct usb_gadget *gadget,
> memcpy(cdev->qw_sign, gi->qw_sign, OS_STRING_QW_SIGN_LEN);
> }
>
> + if (gadget_is_otg(gadget) && !otg_desc[0]) {
> + struct usb_descriptor_header *usb_desc;
> + unsigned length;
> +
> + if (gadget->otg_rev >= 0x0200)
> + length = sizeof(struct usb_otg20_descriptor);
> + else
> + length = sizeof(struct usb_otg_descriptor);
> + usb_desc = kzalloc(length, GFP_KERNEL);
> + if (!usb_desc) {
> + ret = -ENOMEM;
> + goto err_comp_cleanup;
> + }
This code seems to be common across all gadgets.
Can we have usb_otg_descriptor_alloc() that takes care of allocating the
right size based on descriptor version?
Then we can have
usb_desc = usb_otg_descriptor_alloc(gadget);
if (IS_ERR(usb_desc)) {
ret = PTR_ERR(usb_desc);
goto err_comp_cleanup;
}
> + usb_otg_descriptor_init(gadget, usb_desc);
> + otg_desc[0] = usb_desc;
> + otg_desc[1] = NULL;
> + }
> +
> /* Go through all configs, attach all functions */
> list_for_each_entry(c, &gi->cdev.configs, list) {
> struct config_usb_cfg *cfg;
> @@ -1383,6 +1400,9 @@ static int configfs_composite_bind(struct usb_gadget *gadget,
> struct usb_function *tmp;
> struct gadget_config_name *cn;
>
> + if (gadget_is_otg(gadget))
> + c->descriptors = otg_desc;
> +
> cfg = container_of(c, struct config_usb_cfg, c);
> if (!list_empty(&cfg->string_list)) {
> i = 0;
> @@ -1437,6 +1457,8 @@ static void configfs_composite_unbind(struct usb_gadget *gadget)
> cdev = get_gadget_data(gadget);
> gi = container_of(cdev, struct gadget_info, cdev);
>
> + kfree(otg_desc[0]);
> + otg_desc[0] = NULL;
> purge_configs_funcs(gi);
> composite_dev_cleanup(cdev);
> usb_ep_autoconfig_reset(cdev->gadget);
> @@ -1510,12 +1532,6 @@ static struct config_group *gadgets_make(
> if (!gi->composite.gadget_driver.function)
> goto err;
>
> -#ifdef CONFIG_USB_OTG
> - gi->otg.bLength = sizeof(struct usb_otg_descriptor);
> - gi->otg.bDescriptorType = USB_DT_OTG;
> - gi->otg.bmAttributes = USB_OTG_SRP | USB_OTG_HNP;
> -#endif
> -
> config_group_init_type_name(&gi->group, name,
> &gadget_root_type);
> return &gi->group;
cheers,
-roger
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