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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* uvc_status.c -- USB Video Class driver - Status endpoint
*
* Copyright (C) 2005-2009
* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*/
#include <linux/kernel.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include "uvcvideo.h"
/* --------------------------------------------------------------------------
* Input device
*/
#ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
static int uvc_input_init(struct uvc_device *dev)
{
struct input_dev *input;
int ret;
input = input_allocate_device();
if (input == NULL)
return -ENOMEM;
usb_make_path(dev->udev, dev->input_phys, sizeof(dev->input_phys));
strlcat(dev->input_phys, "/button", sizeof(dev->input_phys));
input->name = dev->name;
input->phys = dev->input_phys;
usb_to_input_id(dev->udev, &input->id);
input->dev.parent = &dev->intf->dev;
__set_bit(EV_KEY, input->evbit);
__set_bit(KEY_CAMERA, input->keybit);
if ((ret = input_register_device(input)) < 0)
goto error;
dev->input = input;
return 0;
error:
input_free_device(input);
return ret;
}
static void uvc_input_unregister(struct uvc_device *dev)
{
if (dev->input)
input_unregister_device(dev->input);
}
static void uvc_input_report_key(struct uvc_device *dev, unsigned int code,
int value)
{
if (dev->input) {
input_report_key(dev->input, code, value);
input_sync(dev->input);
}
}
#else
#define uvc_input_init(dev)
#define uvc_input_unregister(dev)
#define uvc_input_report_key(dev, code, value)
#endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */
/* --------------------------------------------------------------------------
* Status interrupt endpoint
*/
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 "
"received.\n");
return;
}
if (status->bEvent == 0) {
if (len < 4)
return;
uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
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",
status->bOriginator, status->bEvent, 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)
{
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;
}
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 false;
}
uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
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)
{
struct uvc_device *dev = urb->context;
int len, ret;
switch (urb->status) {
case 0:
break;
case -ENOENT: /* usb_kill_urb() called. */
case -ECONNRESET: /* usb_unlink_urb() called. */
case -ESHUTDOWN: /* The endpoint is being disabled. */
case -EPROTO: /* Device is disconnected (reported by some
* host controller). */
return;
default:
uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
"completion handler.\n", urb->status);
return;
}
len = urb->actual_length;
if (len > 0) {
switch (dev->status[0] & 0x0f) {
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: {
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 "
"type %u.\n", dev->status[0]);
break;
}
}
/* Resubmit the URB. */
urb->interval = dev->int_ep->desc.bInterval;
if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
ret);
}
}
int uvc_status_init(struct uvc_device *dev)
{
struct usb_host_endpoint *ep = dev->int_ep;
unsigned int pipe;
int interval;
if (ep == NULL)
return 0;
uvc_input_init(dev);
dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL);
if (dev->status == NULL)
return -ENOMEM;
dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
if (dev->int_urb == NULL) {
kfree(dev->status);
return -ENOMEM;
}
pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
/* For high-speed interrupt endpoints, the bInterval value is used as
* an exponent of two. Some developers forgot about it.
*/
interval = ep->desc.bInterval;
if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
(dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
interval = fls(interval) - 1;
usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete,
dev, interval);
return 0;
}
void uvc_status_unregister(struct uvc_device *dev)
{
usb_kill_urb(dev->int_urb);
uvc_input_unregister(dev);
}
void uvc_status_cleanup(struct uvc_device *dev)
{
usb_free_urb(dev->int_urb);
kfree(dev->status);
}
int uvc_status_start(struct uvc_device *dev, gfp_t flags)
{
if (dev->int_urb == NULL)
return 0;
return usb_submit_urb(dev->int_urb, flags);
}
void uvc_status_stop(struct uvc_device *dev)
{
usb_kill_urb(dev->int_urb);
}