diff options
Diffstat (limited to 'drivers/usb/gadget/composite.c')
-rw-r--r-- | drivers/usb/gadget/composite.c | 114 |
1 files changed, 90 insertions, 24 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index c1f037af9702..b407f907d655 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -100,40 +100,43 @@ function_descriptors(struct usb_function *f, } /** - * next_ep_desc() - advance to the next EP descriptor + * next_desc() - advance to the next desc_type descriptor * @t: currect pointer within descriptor array + * @desc_type: descriptor type * - * Return: next EP descriptor or NULL + * Return: next desc_type descriptor or NULL * - * Iterate over @t until either EP descriptor found or + * Iterate over @t until either desc_type descriptor found or * NULL (that indicates end of list) encountered */ static struct usb_descriptor_header** -next_ep_desc(struct usb_descriptor_header **t) +next_desc(struct usb_descriptor_header **t, u8 desc_type) { for (; *t; t++) { - if ((*t)->bDescriptorType == USB_DT_ENDPOINT) + if ((*t)->bDescriptorType == desc_type) return t; } return NULL; } /* - * for_each_ep_desc()- iterate over endpoint descriptors in the - * descriptors list - * @start: pointer within descriptor array. - * @ep_desc: endpoint descriptor to use as the loop cursor + * for_each_desc() - iterate over desc_type descriptors in the + * descriptors list + * @start: pointer within descriptor array. + * @iter_desc: desc_type descriptor to use as the loop cursor + * @desc_type: wanted descriptr type */ -#define for_each_ep_desc(start, ep_desc) \ - for (ep_desc = next_ep_desc(start); \ - ep_desc; ep_desc = next_ep_desc(ep_desc+1)) +#define for_each_desc(start, iter_desc, desc_type) \ + for (iter_desc = next_desc(start, desc_type); \ + iter_desc; iter_desc = next_desc(iter_desc + 1, desc_type)) /** - * config_ep_by_speed() - configures the given endpoint + * config_ep_by_speed_and_alt() - configures the given endpoint * according to gadget speed. * @g: pointer to the gadget * @f: usb function * @_ep: the endpoint to configure + * @alt: alternate setting number * * Return: error code, 0 on success * @@ -146,11 +149,13 @@ next_ep_desc(struct usb_descriptor_header **t) * Note: the supplied function should hold all the descriptors * for supported speeds */ -int config_ep_by_speed(struct usb_gadget *g, - struct usb_function *f, - struct usb_ep *_ep) +int config_ep_by_speed_and_alt(struct usb_gadget *g, + struct usb_function *f, + struct usb_ep *_ep, + u8 alt) { struct usb_endpoint_descriptor *chosen_desc = NULL; + struct usb_interface_descriptor *int_desc = NULL; struct usb_descriptor_header **speed_desc = NULL; struct usb_ss_ep_comp_descriptor *comp_desc = NULL; @@ -186,8 +191,21 @@ int config_ep_by_speed(struct usb_gadget *g, default: speed_desc = f->fs_descriptors; } + + /* find correct alternate setting descriptor */ + for_each_desc(speed_desc, d_spd, USB_DT_INTERFACE) { + int_desc = (struct usb_interface_descriptor *)*d_spd; + + if (int_desc->bAlternateSetting == alt) { + speed_desc = d_spd; + goto intf_found; + } + } + return -EIO; + +intf_found: /* find descriptors */ - for_each_ep_desc(speed_desc, d_spd) { + for_each_desc(speed_desc, d_spd, USB_DT_ENDPOINT) { chosen_desc = (struct usb_endpoint_descriptor *)*d_spd; if (chosen_desc->bEndpointAddress == _ep->address) goto ep_found; @@ -240,6 +258,32 @@ ep_found: } return 0; } +EXPORT_SYMBOL_GPL(config_ep_by_speed_and_alt); + +/** + * config_ep_by_speed() - configures the given endpoint + * according to gadget speed. + * @g: pointer to the gadget + * @f: usb function + * @_ep: the endpoint to configure + * + * Return: error code, 0 on success + * + * This function chooses the right descriptors for a given + * endpoint according to gadget speed and saves it in the + * endpoint desc field. If the endpoint already has a descriptor + * assigned to it - overwrites it with currently corresponding + * descriptor. The endpoint maxpacket field is updated according + * to the chosen descriptor. + * Note: the supplied function should hold all the descriptors + * for supported speeds + */ +int config_ep_by_speed(struct usb_gadget *g, + struct usb_function *f, + struct usb_ep *_ep) +{ + return config_ep_by_speed_and_alt(g, f, _ep, 0); +} EXPORT_SYMBOL_GPL(config_ep_by_speed); /** @@ -351,8 +395,11 @@ int usb_function_deactivate(struct usb_function *function) spin_lock_irqsave(&cdev->lock, flags); - if (cdev->deactivations == 0) + if (cdev->deactivations == 0) { + spin_unlock_irqrestore(&cdev->lock, flags); status = usb_gadget_deactivate(cdev->gadget); + spin_lock_irqsave(&cdev->lock, flags); + } if (status == 0) cdev->deactivations++; @@ -383,8 +430,11 @@ int usb_function_activate(struct usb_function *function) status = -EINVAL; else { cdev->deactivations--; - if (cdev->deactivations == 0) + if (cdev->deactivations == 0) { + spin_unlock_irqrestore(&cdev->lock, flags); status = usb_gadget_activate(cdev->gadget); + spin_lock_irqsave(&cdev->lock, flags); + } } spin_unlock_irqrestore(&cdev->lock, flags); @@ -434,7 +484,7 @@ static u8 encode_bMaxPower(enum usb_device_speed speed, { unsigned val; - if (c->MaxPower) + if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)) val = c->MaxPower; else val = CONFIG_USB_GADGET_VBUS_DRAW; @@ -844,7 +894,11 @@ static int set_config(struct usb_composite_dev *cdev, } /* when we return, be sure our power usage is valid */ - power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW; + if (c->MaxPower || (c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)) + power = c->MaxPower; + else + power = CONFIG_USB_GADGET_VBUS_DRAW; + if (gadget->speed < USB_SPEED_SUPER) power = min(power, 500U); else @@ -1030,7 +1084,7 @@ static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) while (*sp) { s = *sp; language = cpu_to_le16(s->language); - for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { + for (tmp = buf; *tmp && tmp < &buf[USB_MAX_STRING_LEN]; tmp++) { if (*tmp == language) goto repeat; } @@ -1105,7 +1159,7 @@ static int get_string(struct usb_composite_dev *cdev, collect_langs(sp, s->wData); } - for (len = 0; len <= 126 && s->wData[len]; len++) + for (len = 0; len <= USB_MAX_STRING_LEN && s->wData[len]; len++) continue; if (!len) return -EINVAL; @@ -1581,6 +1635,18 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) struct usb_function *f = NULL; u8 endp; + if (w_length > USB_COMP_EP0_BUFSIZ) { + if (ctrl->bRequestType & USB_DIR_IN) { + /* Cast away the const, we are going to overwrite on purpose. */ + __le16 *temp = (__le16 *)&ctrl->wLength; + + *temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ); + w_length = USB_COMP_EP0_BUFSIZ; + } else { + goto done; + } + } + /* partial re-init of the response message; the function or the * gadget might need to intercept e.g. a control-OUT completion * when we delegate to it. @@ -2125,7 +2191,7 @@ int composite_dev_prepare(struct usb_composite_driver *composite, if (!cdev->req) return -ENOMEM; - cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL); + cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL); if (!cdev->req->buf) goto fail; |