V4L/DVB (8145a): USB Video Class driver

This driver supports video input devices compliant with the USB Video Class
specification. This means lots of currently manufactured webcams, and probably
most of the future ones.

Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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);
+}