linux/drivers/w1/masters/matrox_w1.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	matrox_w1.c
 *
 * Copyright (c) 2004 Evgeniy Polyakov <[email protected]>
 */

#include <asm/types.h>
#include <linux/atomic.h>
#include <linux/io.h>

#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/pci_ids.h>
#include <linux/pci.h>

#include <linux/w1.h>

/*
 * Matrox G400 DDC registers.
 */

#define MATROX_G400_DDC_CLK …
#define MATROX_G400_DDC_DATA …

#define MATROX_BASE …
#define MATROX_STATUS …

#define MATROX_PORT_INDEX_OFFSET …
#define MATROX_PORT_DATA_OFFSET …

#define MATROX_GET_CONTROL …
#define MATROX_GET_DATA …
#define MATROX_CURSOR_CTL …

struct matrox_device { … };

/*
 * These functions read and write DDC Data bit.
 *
 * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
 * Unfortunately we can't connect to Intel's 82801xx IO controller
 * since we don't know motherboard schema, which has pretty unused(may be not) GPIO.
 *
 * I've heard that PIIX also has open drain pin.
 *
 * Port mapping.
 */
static inline u8 matrox_w1_read_reg(struct matrox_device *dev, u8 reg)
{ … }

static inline void matrox_w1_write_reg(struct matrox_device *dev, u8 reg, u8 val)
{ … }

static void matrox_w1_write_ddc_bit(void *data, u8 bit)
{ … }

static u8 matrox_w1_read_ddc_bit(void *data)
{ … }

static void matrox_w1_hw_init(struct matrox_device *dev)
{ … }

static int matrox_w1_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{ … }

static void matrox_w1_remove(struct pci_dev *pdev)
{ … }

static struct pci_device_id matrox_w1_tbl[] = …;
MODULE_DEVICE_TABLE(pci, matrox_w1_tbl);

static struct pci_driver matrox_w1_pci_driver = …;
module_pci_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;