summaryrefslogtreecommitdiff
path: root/drivers/media/usb/usbtv/usbtv-core.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/media/usb/usbtv/usbtv-core.c
Initial import
Diffstat (limited to 'drivers/media/usb/usbtv/usbtv-core.c')
-rw-r--r--drivers/media/usb/usbtv/usbtv-core.c145
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/media/usb/usbtv/usbtv-core.c b/drivers/media/usb/usbtv/usbtv-core.c
new file mode 100644
index 000000000..29428bef2
--- /dev/null
+++ b/drivers/media/usb/usbtv/usbtv-core.c
@@ -0,0 +1,145 @@
+/*
+ * Fushicai USBTV007 Audio-Video Grabber Driver
+ *
+ * Product web site:
+ * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html
+ *
+ * Following LWN articles were very useful in construction of this driver:
+ * Video4Linux2 API series: http://lwn.net/Articles/203924/
+ * videobuf2 API explanation: http://lwn.net/Articles/447435/
+ * Thanks go to Jonathan Corbet for providing this quality documentation.
+ * He is awesome.
+ *
+ * Copyright (c) 2013 Lubomir Rintel
+ * All rights reserved.
+ * No physical hardware was harmed running Windows during the
+ * reverse-engineering activity
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ */
+
+#include "usbtv.h"
+
+int usbtv_set_regs(struct usbtv *usbtv, const u16 regs[][2], int size)
+{
+ int ret;
+ int pipe = usb_rcvctrlpipe(usbtv->udev, 0);
+ int i;
+
+ for (i = 0; i < size; i++) {
+ u16 index = regs[i][0];
+ u16 value = regs[i][1];
+
+ ret = usb_control_msg(usbtv->udev, pipe, USBTV_REQUEST_REG,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ value, index, NULL, 0, 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int usbtv_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ int ret;
+ int size;
+ struct device *dev = &intf->dev;
+ struct usbtv *usbtv;
+
+ /* Checks that the device is what we think it is. */
+ if (intf->num_altsetting != 2)
+ return -ENODEV;
+ if (intf->altsetting[1].desc.bNumEndpoints != 4)
+ return -ENODEV;
+
+ /* Packet size is split into 11 bits of base size and count of
+ * extra multiplies of it.*/
+ size = usb_endpoint_maxp(&intf->altsetting[1].endpoint[0].desc);
+ size = (size & 0x07ff) * (((size & 0x1800) >> 11) + 1);
+
+ /* Device structure */
+ usbtv = kzalloc(sizeof(struct usbtv), GFP_KERNEL);
+ if (usbtv == NULL)
+ return -ENOMEM;
+ usbtv->dev = dev;
+ usbtv->udev = usb_get_dev(interface_to_usbdev(intf));
+
+ usbtv->iso_size = size;
+
+ usb_set_intfdata(intf, usbtv);
+
+ ret = usbtv_video_init(usbtv);
+ if (ret < 0)
+ goto usbtv_video_fail;
+
+ ret = usbtv_audio_init(usbtv);
+ if (ret < 0)
+ goto usbtv_audio_fail;
+
+ /* for simplicity we exploit the v4l2_device reference counting */
+ v4l2_device_get(&usbtv->v4l2_dev);
+
+ dev_info(dev, "Fushicai USBTV007 Audio-Video Grabber\n");
+ return 0;
+
+usbtv_audio_fail:
+ usbtv_video_free(usbtv);
+
+usbtv_video_fail:
+ usb_set_intfdata(intf, NULL);
+ usb_put_dev(usbtv->udev);
+ kfree(usbtv);
+
+ return ret;
+}
+
+static void usbtv_disconnect(struct usb_interface *intf)
+{
+ struct usbtv *usbtv = usb_get_intfdata(intf);
+
+ usb_set_intfdata(intf, NULL);
+
+ if (!usbtv)
+ return;
+
+ usbtv_audio_free(usbtv);
+ usbtv_video_free(usbtv);
+
+ usb_put_dev(usbtv->udev);
+ usbtv->udev = NULL;
+
+ /* the usbtv structure will be deallocated when v4l2 will be
+ done using it */
+ v4l2_device_put(&usbtv->v4l2_dev);
+}
+
+static struct usb_device_id usbtv_id_table[] = {
+ { USB_DEVICE(0x1b71, 0x3002) },
+ {}
+};
+MODULE_DEVICE_TABLE(usb, usbtv_id_table);
+
+MODULE_AUTHOR("Lubomir Rintel, Federico Simoncelli");
+MODULE_DESCRIPTION("Fushicai USBTV007 Audio-Video Grabber Driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static struct usb_driver usbtv_usb_driver = {
+ .name = "usbtv",
+ .id_table = usbtv_id_table,
+ .probe = usbtv_probe,
+ .disconnect = usbtv_disconnect,
+};
+
+module_usb_driver(usbtv_usb_driver);