cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cx23885-ir.c (3272B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  Driver for the Conexant CX23885/7/8 PCIe bridge
      4 *
      5 *  Infrared device support routines - non-input, non-vl42_subdev routines
      6 *
      7 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
      8 */
      9
     10#include "cx23885.h"
     11#include "cx23885-ir.h"
     12#include "cx23885-input.h"
     13
     14#include <media/v4l2-device.h>
     15
     16#define CX23885_IR_RX_FIFO_SERVICE_REQ		0
     17#define CX23885_IR_RX_END_OF_RX_DETECTED	1
     18#define CX23885_IR_RX_HW_FIFO_OVERRUN		2
     19#define CX23885_IR_RX_SW_FIFO_OVERRUN		3
     20
     21#define CX23885_IR_TX_FIFO_SERVICE_REQ		0
     22
     23
     24void cx23885_ir_rx_work_handler(struct work_struct *work)
     25{
     26	struct cx23885_dev *dev =
     27			     container_of(work, struct cx23885_dev, ir_rx_work);
     28	u32 events = 0;
     29	unsigned long *notifications = &dev->ir_rx_notifications;
     30
     31	if (test_and_clear_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications))
     32		events |= V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN;
     33	if (test_and_clear_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications))
     34		events |= V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN;
     35	if (test_and_clear_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications))
     36		events |= V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED;
     37	if (test_and_clear_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications))
     38		events |= V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ;
     39
     40	if (events == 0)
     41		return;
     42
     43	if (dev->kernel_ir)
     44		cx23885_input_rx_work_handler(dev, events);
     45}
     46
     47void cx23885_ir_tx_work_handler(struct work_struct *work)
     48{
     49	struct cx23885_dev *dev =
     50			     container_of(work, struct cx23885_dev, ir_tx_work);
     51	u32 events = 0;
     52	unsigned long *notifications = &dev->ir_tx_notifications;
     53
     54	if (test_and_clear_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications))
     55		events |= V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ;
     56
     57	if (events == 0)
     58		return;
     59
     60}
     61
     62/* Possibly called in an IRQ context */
     63void cx23885_ir_rx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
     64{
     65	struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
     66	unsigned long *notifications = &dev->ir_rx_notifications;
     67
     68	if (events & V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ)
     69		set_bit(CX23885_IR_RX_FIFO_SERVICE_REQ, notifications);
     70	if (events & V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED)
     71		set_bit(CX23885_IR_RX_END_OF_RX_DETECTED, notifications);
     72	if (events & V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN)
     73		set_bit(CX23885_IR_RX_HW_FIFO_OVERRUN, notifications);
     74	if (events & V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN)
     75		set_bit(CX23885_IR_RX_SW_FIFO_OVERRUN, notifications);
     76
     77	/*
     78	 * For the integrated AV core, we are already in a workqueue context.
     79	 * For the CX23888 integrated IR, we are in an interrupt context.
     80	 */
     81	if (sd == dev->sd_cx25840)
     82		cx23885_ir_rx_work_handler(&dev->ir_rx_work);
     83	else
     84		schedule_work(&dev->ir_rx_work);
     85}
     86
     87/* Possibly called in an IRQ context */
     88void cx23885_ir_tx_v4l2_dev_notify(struct v4l2_subdev *sd, u32 events)
     89{
     90	struct cx23885_dev *dev = to_cx23885(sd->v4l2_dev);
     91	unsigned long *notifications = &dev->ir_tx_notifications;
     92
     93	if (events & V4L2_SUBDEV_IR_TX_FIFO_SERVICE_REQ)
     94		set_bit(CX23885_IR_TX_FIFO_SERVICE_REQ, notifications);
     95
     96	/*
     97	 * For the integrated AV core, we are already in a workqueue context.
     98	 * For the CX23888 integrated IR, we are in an interrupt context.
     99	 */
    100	if (sd == dev->sd_cx25840)
    101		cx23885_ir_tx_work_handler(&dev->ir_tx_work);
    102	else
    103		schedule_work(&dev->ir_tx_work);
    104}