drivers/media/pci/cx23885/cx23885-input.c
Source file repositories/reference/linux-study-clean/drivers/media/pci/cx23885/cx23885-input.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/media/pci/cx23885/cx23885-input.c- Extension
.c- Size
- 11647 bytes
- Lines
- 411
- 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
cx23885.hcx23885-input.hlinux/slab.hmedia/rc-core.hmedia/v4l2-subdev.h
Detected Declarations
function Copyrightfunction cx23885_input_rx_work_handlerfunction cx23885_input_ir_startfunction cx23885_input_ir_openfunction cx23885_input_ir_stopfunction cx23885_input_ir_closefunction cx23885_input_initfunction cx23885_input_fini
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for the Conexant CX23885/7/8 PCIe bridge
*
* Infrared remote control input device
*
* Most of this file is
*
* Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>
*
* However, the cx23885_input_{init,fini} functions contained herein are
* derived from Linux kernel files linux/media/video/.../...-input.c marked as:
*
* Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
* Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
* Markus Rechberger <mrechberger@gmail.com>
* Mauro Carvalho Chehab <mchehab@kernel.org>
* Sascha Sommer <saschasommer@freenet.de>
* Copyright (C) 2004, 2005 Chris Pascoe
* Copyright (C) 2003, 2004 Gerd Knorr
* Copyright (C) 2003 Pavel Machek
*/
#include "cx23885.h"
#include "cx23885-input.h"
#include <linux/slab.h>
#include <media/rc-core.h>
#include <media/v4l2-subdev.h>
#define MODULE_NAME "cx23885"
static void cx23885_input_process_measurements(struct cx23885_dev *dev,
bool overrun)
{
struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;
ssize_t num;
int count, i;
bool handle = false;
struct ir_raw_event ir_core_event[64];
do {
num = 0;
v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
sizeof(ir_core_event), &num);
count = num / sizeof(struct ir_raw_event);
for (i = 0; i < count; i++) {
ir_raw_event_store(kernel_ir->rc,
&ir_core_event[i]);
handle = true;
}
} while (num != 0);
if (overrun)
ir_raw_event_overflow(kernel_ir->rc);
else if (handle)
ir_raw_event_handle(kernel_ir->rc);
}
void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
{
struct v4l2_subdev_ir_parameters params;
int overrun, data_available;
if (dev->sd_ir == NULL || events == 0)
return;
switch (dev->board) {
case CX23885_BOARD_HAUPPAUGE_HVR1270:
case CX23885_BOARD_HAUPPAUGE_HVR1850:
case CX23885_BOARD_HAUPPAUGE_HVR1290:
case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
case CX23885_BOARD_TEVII_S470:
case CX23885_BOARD_HAUPPAUGE_HVR1250:
case CX23885_BOARD_MYGICA_X8507:
case CX23885_BOARD_TBS_6980:
case CX23885_BOARD_TBS_6981:
case CX23885_BOARD_DVBSKY_T9580:
case CX23885_BOARD_DVBSKY_T980C:
case CX23885_BOARD_DVBSKY_S950C:
case CX23885_BOARD_TT_CT2_4500_CI:
case CX23885_BOARD_DVBSKY_S950:
case CX23885_BOARD_DVBSKY_S952:
case CX23885_BOARD_DVBSKY_T982:
case CX23885_BOARD_HAUPPAUGE_HVR1265_K4:
/*
* The only boards we handle right now. However other boards
Annotation
- Immediate include surface: `cx23885.h`, `cx23885-input.h`, `linux/slab.h`, `media/rc-core.h`, `media/v4l2-subdev.h`.
- Detected declarations: `function Copyright`, `function cx23885_input_rx_work_handler`, `function cx23885_input_ir_start`, `function cx23885_input_ir_open`, `function cx23885_input_ir_stop`, `function cx23885_input_ir_close`, `function cx23885_input_init`, `function cx23885_input_fini`.
- 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.