diff options
Diffstat (limited to 'drivers/media/usb/uvc/uvc_status.c')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_status.c | 121 |
1 files changed, 107 insertions, 14 deletions
diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c index 7b710410584a..0722dc684378 100644 --- a/drivers/media/usb/uvc/uvc_status.c +++ b/drivers/media/usb/uvc/uvc_status.c @@ -78,7 +78,24 @@ static void uvc_input_report_key(struct uvc_device *dev, unsigned int code, /* -------------------------------------------------------------------------- * Status interrupt endpoint */ -static void uvc_event_streaming(struct uvc_device *dev, u8 *data, int len) +struct uvc_streaming_status { + u8 bStatusType; + u8 bOriginator; + u8 bEvent; + u8 bValue[]; +} __packed; + +struct uvc_control_status { + u8 bStatusType; + u8 bOriginator; + u8 bEvent; + u8 bSelector; + u8 bAttribute; + u8 bValue[]; +} __packed; + +static void uvc_event_streaming(struct uvc_device *dev, + struct uvc_streaming_status *status, int len) { if (len < 3) { uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event " @@ -86,31 +103,97 @@ static void uvc_event_streaming(struct uvc_device *dev, u8 *data, int len) return; } - if (data[2] == 0) { + if (status->bEvent == 0) { if (len < 4) return; uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n", - data[1], data[3] ? "pressed" : "released", len); - uvc_input_report_key(dev, KEY_CAMERA, data[3]); + status->bOriginator, + status->bValue[0] ? "pressed" : "released", len); + uvc_input_report_key(dev, KEY_CAMERA, status->bValue[0]); } else { uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x len %d.\n", - data[1], data[2], len); + status->bOriginator, status->bEvent, len); } } -static void uvc_event_control(struct uvc_device *dev, u8 *data, int len) +#define UVC_CTRL_VALUE_CHANGE 0 +#define UVC_CTRL_INFO_CHANGE 1 +#define UVC_CTRL_FAILURE_CHANGE 2 +#define UVC_CTRL_MIN_CHANGE 3 +#define UVC_CTRL_MAX_CHANGE 4 + +static struct uvc_control *uvc_event_entity_find_ctrl(struct uvc_entity *entity, + u8 selector) { - char *attrs[3] = { "value", "info", "failure" }; + struct uvc_control *ctrl; + unsigned int i; + + for (i = 0, ctrl = entity->controls; i < entity->ncontrols; i++, ctrl++) + if (ctrl->info.selector == selector) + return ctrl; + + return NULL; +} - if (len < 6 || data[2] != 0 || data[4] > 2) { +static struct uvc_control *uvc_event_find_ctrl(struct uvc_device *dev, + const struct uvc_control_status *status, + struct uvc_video_chain **chain) +{ + list_for_each_entry((*chain), &dev->chains, list) { + struct uvc_entity *entity; + struct uvc_control *ctrl; + + list_for_each_entry(entity, &(*chain)->entities, chain) { + if (entity->id != status->bOriginator) + continue; + + ctrl = uvc_event_entity_find_ctrl(entity, + status->bSelector); + if (ctrl) + return ctrl; + } + } + + return NULL; +} + +static bool uvc_event_control(struct urb *urb, + const struct uvc_control_status *status, int len) +{ + static const char *attrs[] = { "value", "info", "failure", "min", "max" }; + struct uvc_device *dev = urb->context; + struct uvc_video_chain *chain; + struct uvc_control *ctrl; + + if (len < 6 || status->bEvent != 0 || + status->bAttribute >= ARRAY_SIZE(attrs)) { uvc_trace(UVC_TRACE_STATUS, "Invalid control status event " "received.\n"); - return; + return false; } uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n", - data[1], data[3], attrs[data[4]], len); + status->bOriginator, status->bSelector, + attrs[status->bAttribute], len); + + /* Find the control. */ + ctrl = uvc_event_find_ctrl(dev, status, &chain); + if (!ctrl) + return false; + + switch (status->bAttribute) { + case UVC_CTRL_VALUE_CHANGE: + return uvc_ctrl_status_event(urb, chain, ctrl, status->bValue); + + case UVC_CTRL_INFO_CHANGE: + case UVC_CTRL_FAILURE_CHANGE: + case UVC_CTRL_MIN_CHANGE: + case UVC_CTRL_MAX_CHANGE: + break; + } + + return false; } static void uvc_status_complete(struct urb *urb) @@ -138,13 +221,23 @@ static void uvc_status_complete(struct urb *urb) len = urb->actual_length; if (len > 0) { switch (dev->status[0] & 0x0f) { - case UVC_STATUS_TYPE_CONTROL: - uvc_event_control(dev, dev->status, len); + case UVC_STATUS_TYPE_CONTROL: { + struct uvc_control_status *status = + (struct uvc_control_status *)dev->status; + + if (uvc_event_control(urb, status, len)) + /* The URB will be resubmitted in work context. */ + return; break; + } - case UVC_STATUS_TYPE_STREAMING: - uvc_event_streaming(dev, dev->status, len); + case UVC_STATUS_TYPE_STREAMING: { + struct uvc_streaming_status *status = + (struct uvc_streaming_status *)dev->status; + + uvc_event_streaming(dev, status, len); break; + } default: uvc_trace(UVC_TRACE_STATUS, "Unknown status event " |