diff options
Diffstat (limited to 'drivers/media/usb/uvc/uvc_status.c')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_status.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c new file mode 100644 index 000000000000..b7492775e6ae --- /dev/null +++ b/drivers/media/usb/uvc/uvc_status.c @@ -0,0 +1,237 @@ +/* + * uvc_status.c -- USB Video Class driver - Status endpoint + * + * Copyright (C) 2005-2009 + * Laurent Pinchart (laurent.pinchart@ideasonboard.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#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_cleanup(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_cleanup(dev) +#define uvc_input_report_key(dev, code, value) +#endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */ + +/* -------------------------------------------------------------------------- + * Status interrupt endpoint + */ +static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len) +{ + if (len < 3) { + uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event " + "received.\n"); + return; + } + + if (data[2] == 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]); + } else { + uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x " + "len %d.\n", data[1], data[2], data[3], len); + } +} + +static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len) +{ + char *attrs[3] = { "value", "info", "failure" }; + + if (len < 6 || data[2] != 0 || data[4] > 2) { + uvc_trace(UVC_TRACE_STATUS, "Invalid control status event " + "received.\n"); + return; + } + + uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n", + data[1], data[3], attrs[data[4]], len); +} + +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: + uvc_event_control(dev, dev->status, len); + break; + + case UVC_STATUS_TYPE_STREAMING: + uvc_event_streaming(dev, 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_cleanup(struct uvc_device *dev) +{ + usb_kill_urb(dev->int_urb); + usb_free_urb(dev->int_urb); + kfree(dev->status); + uvc_input_cleanup(dev); +} + +int uvc_status_start(struct uvc_device *dev) +{ + if (dev->int_urb == NULL) + return 0; + + return usb_submit_urb(dev->int_urb, GFP_KERNEL); +} + +void uvc_status_stop(struct uvc_device *dev) +{ + usb_kill_urb(dev->int_urb); +} + +int uvc_status_suspend(struct uvc_device *dev) +{ + if (atomic_read(&dev->users)) + usb_kill_urb(dev->int_urb); + + return 0; +} + +int uvc_status_resume(struct uvc_device *dev) +{ + if (dev->int_urb == NULL || atomic_read(&dev->users) == 0) + return 0; + + return usb_submit_urb(dev->int_urb, GFP_NOIO); +} + |