drivers/media/cec/platform/s5p/exynos_hdmi_cecctrl.c

Source file repositories/reference/linux-study-clean/drivers/media/cec/platform/s5p/exynos_hdmi_cecctrl.c

File Facts

System
Linux kernel
Corpus path
drivers/media/cec/platform/s5p/exynos_hdmi_cecctrl.c
Extension
.c
Size
4792 bytes
Lines
207
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/* drivers/media/platform/s5p-cec/exynos_hdmi_cecctrl.c
 *
 * Copyright (c) 2009, 2014 Samsung Electronics
 *		http://www.samsung.com/
 *
 * cec ftn file for Samsung TVOUT driver
 */

#include <linux/io.h>
#include <linux/device.h>

#include "exynos_hdmi_cec.h"
#include "regs-cec.h"

#define S5P_HDMI_FIN			24000000
#define CEC_DIV_RATIO			320000

#define CEC_MESSAGE_BROADCAST_MASK	0x0F
#define CEC_MESSAGE_BROADCAST		0x0F
#define CEC_FILTER_THRESHOLD		0x15

void s5p_cec_set_divider(struct s5p_cec_dev *cec)
{
	u32 div_ratio, div_val;
	unsigned int reg;

	div_ratio  = S5P_HDMI_FIN / CEC_DIV_RATIO - 1;

	if (regmap_read(cec->pmu, EXYNOS_HDMI_PHY_CONTROL, &reg)) {
		dev_err(cec->dev, "failed to read phy control\n");
		return;
	}

	reg = (reg & ~(0x3FF << 16)) | (div_ratio << 16);

	if (regmap_write(cec->pmu, EXYNOS_HDMI_PHY_CONTROL, reg)) {
		dev_err(cec->dev, "failed to write phy control\n");
		return;
	}

	div_val = CEC_DIV_RATIO * 0.00005 - 1;

	writeb(0x0, cec->reg + S5P_CEC_DIVISOR_3);
	writeb(0x0, cec->reg + S5P_CEC_DIVISOR_2);
	writeb(0x0, cec->reg + S5P_CEC_DIVISOR_1);
	writeb(div_val, cec->reg + S5P_CEC_DIVISOR_0);
}

void s5p_cec_enable_rx(struct s5p_cec_dev *cec)
{
	u8 reg;

	reg = readb(cec->reg + S5P_CEC_RX_CTRL);
	reg |= S5P_CEC_RX_CTRL_ENABLE;
	writeb(reg, cec->reg + S5P_CEC_RX_CTRL);
}

void s5p_cec_mask_rx_interrupts(struct s5p_cec_dev *cec)
{
	u8 reg;

	reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
	reg |= S5P_CEC_IRQ_RX_DONE;
	reg |= S5P_CEC_IRQ_RX_ERROR;
	writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
}

void s5p_cec_unmask_rx_interrupts(struct s5p_cec_dev *cec)
{
	u8 reg;

	reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
	reg &= ~S5P_CEC_IRQ_RX_DONE;
	reg &= ~S5P_CEC_IRQ_RX_ERROR;
	writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
}

void s5p_cec_mask_tx_interrupts(struct s5p_cec_dev *cec)
{
	u8 reg;

	reg = readb(cec->reg + S5P_CEC_IRQ_MASK);
	reg |= S5P_CEC_IRQ_TX_DONE;
	reg |= S5P_CEC_IRQ_TX_ERROR;
	writeb(reg, cec->reg + S5P_CEC_IRQ_MASK);
}

void s5p_cec_unmask_tx_interrupts(struct s5p_cec_dev *cec)
{

Annotation

Implementation Notes