drivers/media/pci/ngene/ngene-i2c.c

Source file repositories/reference/linux-study-clean/drivers/media/pci/ngene/ngene-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/ngene/ngene-i2c.c
Extension
.c
Size
3840 bytes
Lines
160
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
/*
 * ngene-i2c.c: nGene PCIe bridge driver i2c functions
 *
 * Copyright (C) 2005-2007 Micronas
 *
 * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
 *                         Modifications for new nGene firmware,
 *                         support for EEPROM-copying,
 *                         support for new dual DVB-S2 card prototype
 */

/* FIXME - some of these can probably be removed */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/io.h>
#include <asm/div64.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/timer.h>
#include <linux/byteorder/generic.h>
#include <linux/firmware.h>
#include <linux/vmalloc.h>

#include "ngene.h"

/* Firmware command for i2c operations */
static int ngene_command_i2c_read(struct ngene *dev, u8 adr,
			   u8 *out, u8 outlen, u8 *in, u8 inlen, int flag)
{
	struct ngene_command com;

	com.cmd.hdr.Opcode = CMD_I2C_READ;
	com.cmd.hdr.Length = outlen + 3;
	com.cmd.I2CRead.Device = adr << 1;
	memcpy(com.cmd.I2CRead.Data, out, outlen);
	com.cmd.I2CRead.Data[outlen] = inlen;
	com.cmd.I2CRead.Data[outlen + 1] = 0;
	com.in_len = outlen + 3;
	com.out_len = inlen + 1;

	if (ngene_command(dev, &com) < 0)
		return -EIO;

	if ((com.cmd.raw8[0] >> 1) != adr)
		return -EIO;

	if (flag)
		memcpy(in, com.cmd.raw8, inlen + 1);
	else
		memcpy(in, com.cmd.raw8 + 1, inlen);
	return 0;
}

static int ngene_command_i2c_write(struct ngene *dev, u8 adr,
				   u8 *out, u8 outlen)
{
	struct ngene_command com;


	com.cmd.hdr.Opcode = CMD_I2C_WRITE;
	com.cmd.hdr.Length = outlen + 1;
	com.cmd.I2CRead.Device = adr << 1;
	memcpy(com.cmd.I2CRead.Data, out, outlen);
	com.in_len = outlen + 1;
	com.out_len = 1;

	if (ngene_command(dev, &com) < 0)
		return -EIO;

	if (com.cmd.raw8[0] == 1)
		return -EIO;

	return 0;
}

static void ngene_i2c_set_bus(struct ngene *dev, int bus)
{
	if (!(dev->card_info->i2c_access & 2))
		return;
	if (dev->i2c_current_bus == bus)
		return;

	switch (bus) {
	case 0:
		ngene_command_gpio_set(dev, 3, 0);
		ngene_command_gpio_set(dev, 2, 1);

Annotation

Implementation Notes