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path: root/drivers/media/video/uvc/uvc_status.c
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Diffstat (limited to 'drivers/media/video/uvc/uvc_status.c')
-rw-r--r--drivers/media/video/uvc/uvc_status.c207
1 files changed, 207 insertions, 0 deletions
diff --git a/drivers/media/video/uvc/uvc_status.c b/drivers/media/video/uvc/uvc_status.c
new file mode 100644
index 0000000..be9084e
--- /dev/null
+++ b/drivers/media/video/uvc/uvc_status.c
@@ -0,0 +1,207 @@
+/*
+ * uvc_status.c -- USB Video Class driver - Status endpoint
+ *
+ * Copyright (C) 2007-2008
+ * Laurent Pinchart (laurent.pinchart@skynet.be)
+ *
+ * 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/version.h>
+#include <linux/input.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+
+#include "uvcvideo.h"
+
+/* --------------------------------------------------------------------------
+ * Input device
+ */
+static int uvc_input_init(struct uvc_device *dev)
+{
+ struct usb_device *udev = dev->udev;
+ struct input_dev *input;
+ char *phys = NULL;
+ int ret;
+
+ input = input_allocate_device();
+ if (input == NULL)
+ return -ENOMEM;
+
+ phys = kmalloc(6 + strlen(udev->bus->bus_name) + strlen(udev->devpath),
+ GFP_KERNEL);
+ if (phys == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ sprintf(phys, "usb-%s-%s", udev->bus->bus_name, udev->devpath);
+
+ input->name = dev->name;
+ input->phys = phys;
+ usb_to_input_id(udev, &input->id);
+ input->dev.parent = &dev->intf->dev;
+
+ set_bit(EV_KEY, input->evbit);
+ set_bit(BTN_0, input->keybit);
+
+ if ((ret = input_register_device(input)) < 0)
+ goto error;
+
+ dev->input = input;
+ return 0;
+
+error:
+ input_free_device(input);
+ kfree(phys);
+ return ret;
+}
+
+static void uvc_input_cleanup(struct uvc_device *dev)
+{
+ if (dev->input)
+ input_unregister_device(dev->input);
+}
+
+/* --------------------------------------------------------------------------
+ * 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);
+ if (dev->input)
+ input_report_key(dev->input, BTN_0, 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_printk(KERN_INFO, "unknown 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->int_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (dev->int_urb == NULL)
+ 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, sizeof dev->status, uvc_status_complete,
+ dev, interval);
+
+ return usb_submit_urb(dev->int_urb, GFP_KERNEL);
+}
+
+void uvc_status_cleanup(struct uvc_device *dev)
+{
+ usb_kill_urb(dev->int_urb);
+ usb_free_urb(dev->int_urb);
+ uvc_input_cleanup(dev);
+}
+
+int uvc_status_suspend(struct uvc_device *dev)
+{
+ usb_kill_urb(dev->int_urb);
+ return 0;
+}
+
+int uvc_status_resume(struct uvc_device *dev)
+{
+ if (dev->int_urb == NULL)
+ return 0;
+
+ return usb_submit_urb(dev->int_urb, GFP_KERNEL);
+}
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