drivers/media/usb/dvb-usb/dvb-usb-dvb.c
Source file repositories/reference/linux-study-clean/drivers/media/usb/dvb-usb/dvb-usb-dvb.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/media/usb/dvb-usb/dvb-usb-dvb.c- Extension
.c- Size
- 9474 bytes
- Lines
- 351
- Domain
- Driver Families
- Bucket
- drivers/media
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
dvb-usb-common.hmedia/media-device.h
Detected Declarations
function Copyrightfunction dvb_usb_start_feedfunction dvb_usb_stop_feedfunction dvb_usb_media_device_initfunction dvb_usb_media_device_registerfunction dvb_usb_media_device_unregisterfunction dvb_usb_adapter_dvb_initfunction dvb_usb_adapter_dvb_exitfunction dvb_usb_set_active_fefunction dvb_usb_fe_wakeupfunction dvb_usb_fe_sleepfunction dvb_usb_adapter_frontend_initfunction dvb_usb_adapter_frontend_exit
Annotated Snippet
if (adap->props.fe[adap->active_fe].streaming_ctrl != NULL) {
ret = adap->props.fe[adap->active_fe].streaming_ctrl(adap, 0);
if (ret < 0) {
err("error while stopping stream.");
return ret;
}
}
}
adap->feedcount = newfeedcount;
/* activate the pid on the device specific pid_filter */
deb_ts("setting pid (%s): %5d %04x at index %d '%s'\n",
adap->fe_adap[adap->active_fe].pid_filtering ?
"yes" : "no", dvbdmxfeed->pid, dvbdmxfeed->pid,
dvbdmxfeed->index, onoff ? "on" : "off");
if (adap->props.fe[adap->active_fe].caps & DVB_USB_ADAP_HAS_PID_FILTER &&
adap->fe_adap[adap->active_fe].pid_filtering &&
adap->props.fe[adap->active_fe].pid_filter != NULL)
adap->props.fe[adap->active_fe].pid_filter(adap, dvbdmxfeed->index, dvbdmxfeed->pid, onoff);
/* start the feed if this was the first feed and there is still a feed
* for reception.
*/
if (adap->feedcount == onoff && adap->feedcount > 0) {
deb_ts("controlling pid parser\n");
if (adap->props.fe[adap->active_fe].caps & DVB_USB_ADAP_HAS_PID_FILTER &&
adap->props.fe[adap->active_fe].caps &
DVB_USB_ADAP_PID_FILTER_CAN_BE_TURNED_OFF &&
adap->props.fe[adap->active_fe].pid_filter_ctrl != NULL) {
ret = adap->props.fe[adap->active_fe].pid_filter_ctrl(adap,
adap->fe_adap[adap->active_fe].pid_filtering);
if (ret < 0) {
err("could not handle pid_parser");
return ret;
}
}
deb_ts("start feeding\n");
if (adap->props.fe[adap->active_fe].streaming_ctrl != NULL) {
ret = adap->props.fe[adap->active_fe].streaming_ctrl(adap, 1);
if (ret < 0) {
err("error while enabling fifo.");
return ret;
}
}
deb_ts("submitting all URBs\n");
usb_urb_submit(&adap->fe_adap[adap->active_fe].stream);
}
return 0;
}
static int dvb_usb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
{
deb_ts("start pid: 0x%04x, feedtype: %d\n", dvbdmxfeed->pid,
dvbdmxfeed->type);
return dvb_usb_ctrl_feed(dvbdmxfeed, 1);
}
static int dvb_usb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
{
deb_ts("stop pid: 0x%04x, feedtype: %d\n", dvbdmxfeed->pid, dvbdmxfeed->type);
return dvb_usb_ctrl_feed(dvbdmxfeed, 0);
}
static int dvb_usb_media_device_init(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
struct media_device *mdev;
struct dvb_usb_device *d = adap->dev;
struct usb_device *udev = d->udev;
mdev = kzalloc_obj(*mdev);
if (!mdev)
return -ENOMEM;
media_device_usb_init(mdev, udev, d->desc->name);
dvb_register_media_controller(&adap->dvb_adap, mdev);
dev_info(&d->udev->dev, "media controller created\n");
#endif
return 0;
}
static int dvb_usb_media_device_register(struct dvb_usb_adapter *adap)
{
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
return media_device_register(adap->dvb_adap.mdev);
#else
Annotation
- Immediate include surface: `dvb-usb-common.h`, `media/media-device.h`.
- Detected declarations: `function Copyright`, `function dvb_usb_start_feed`, `function dvb_usb_stop_feed`, `function dvb_usb_media_device_init`, `function dvb_usb_media_device_register`, `function dvb_usb_media_device_unregister`, `function dvb_usb_adapter_dvb_init`, `function dvb_usb_adapter_dvb_exit`, `function dvb_usb_set_active_fe`, `function dvb_usb_fe_wakeup`.
- Atlas domain: Driver Families / drivers/media.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.