linux/drivers/i2c/busses/i2c-via.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
    i2c Support for Via Technologies 82C586B South Bridge

    Copyright (c) 1998, 1999 Kyösti Mälkki <[email protected]>

*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/io.h>

/* Power management registers */
#define PM_CFG_REVID …
#define PM_CFG_IOBASE0 …
#define PM_CFG_IOBASE1 …

#define I2C_DIR …
#define I2C_OUT …
#define I2C_IN …
#define I2C_SCL …
#define I2C_SDA …

/* io-region reservation */
#define IOSPACE …

static struct pci_driver vt586b_driver;
static u16 pm_io_base;

/*
   It does not appear from the datasheet that the GPIO pins are
   open drain. So a we set a low value by setting the direction to
   output and a high value by setting the direction to input and
   relying on the required I2C pullup. The data value is initialized
   to 0 in via_init() and never changed.
*/
static void bit_via_setscl(void *data, int state)
{ … }

static void bit_via_setsda(void *data, int state)
{ … }

static int bit_via_getscl(void *data)
{ … }

static int bit_via_getsda(void *data)
{ … }


static struct i2c_algo_bit_data bit_data = …;

static struct i2c_adapter vt586b_adapter = …;


static const struct pci_device_id vt586b_ids[] = …;

MODULE_DEVICE_TABLE (pci, vt586b_ids);

static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
{ … }

static void vt586b_remove(struct pci_dev *dev)
{ … }


static struct pci_driver vt586b_driver = …;

module_pci_driver(…) …;

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