linux/drivers/i2c/busses/i2c-via.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] this program is distributed in the hope that
  it will be useful but without any warranty without even the implied
  warranty of merchantability or fitness for a particular purpose see
  the gnu general public license for more details

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] this program is distributed in the hope
  that it will be useful but without any warranty without even the
  implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

156 lines
3.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
i2c Support for Via Technologies 82C586B South Bridge
Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
*/
#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 0x08 /* silicon revision code */
#define PM_CFG_IOBASE0 0x20
#define PM_CFG_IOBASE1 0x48
#define I2C_DIR (pm_io_base+0x40)
#define I2C_OUT (pm_io_base+0x42)
#define I2C_IN (pm_io_base+0x44)
#define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */
#define I2C_SDA 0x04
/* io-region reservation */
#define IOSPACE 0x06
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)
{
outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR);
}
static void bit_via_setsda(void *data, int state)
{
outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR);
}
static int bit_via_getscl(void *data)
{
return (0 != (inb(I2C_IN) & I2C_SCL));
}
static int bit_via_getsda(void *data)
{
return (0 != (inb(I2C_IN) & I2C_SDA));
}
static struct i2c_algo_bit_data bit_data = {
.setsda = bit_via_setsda,
.setscl = bit_via_setscl,
.getsda = bit_via_getsda,
.getscl = bit_via_getscl,
.udelay = 5,
.timeout = HZ
};
static struct i2c_adapter vt586b_adapter = {
.owner = THIS_MODULE,
.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
.name = "VIA i2c",
.algo_data = &bit_data,
};
static const struct pci_device_id vt586b_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) },
{ 0, }
};
MODULE_DEVICE_TABLE (pci, vt586b_ids);
static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
u16 base;
u8 rev;
int res;
if (pm_io_base) {
dev_err(&dev->dev, "i2c-via: Will only support one host\n");
return -ENODEV;
}
pci_read_config_byte(dev, PM_CFG_REVID, &rev);
switch (rev) {
case 0x00:
base = PM_CFG_IOBASE0;
break;
case 0x01:
case 0x10:
base = PM_CFG_IOBASE1;
break;
default:
base = PM_CFG_IOBASE1;
/* later revision */
}
pci_read_config_word(dev, base, &pm_io_base);
pm_io_base &= (0xff << 8);
if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) {
dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE);
return -ENODEV;
}
outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR);
outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT);
/* set up the sysfs linkage to our parent device */
vt586b_adapter.dev.parent = &dev->dev;
res = i2c_bit_add_bus(&vt586b_adapter);
if ( res < 0 ) {
release_region(I2C_DIR, IOSPACE);
pm_io_base = 0;
return res;
}
return 0;
}
static void vt586b_remove(struct pci_dev *dev)
{
i2c_del_adapter(&vt586b_adapter);
release_region(I2C_DIR, IOSPACE);
pm_io_base = 0;
}
static struct pci_driver vt586b_driver = {
.name = "vt586b_smbus",
.id_table = vt586b_ids,
.probe = vt586b_probe,
.remove = vt586b_remove,
};
module_pci_driver(vt586b_driver);
MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>");
MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge");
MODULE_LICENSE("GPL");