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linux-kernel-test/drivers/i2c/busses/i2c-prosavage.c
Jean Delvare a0d9c63d36 i2c-algo-bit: Discard the mdelay data struct member 
i2c-algo-bit: Discard the mdelay data struct member

The i2c_algo_bit_data structure has an mdelay member, which is not
used by the algorithm code (the code has always been ifdef'd out.)
Let's discard it to save some code and memory.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-09-26 15:38:51 -07:00

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/*
* kernel/busses/i2c-prosavage.c
*
* i2c bus driver for S3/VIA 8365/8375 graphics processor.
* Copyright (c) 2003 Henk Vergonet <henk@god.dyndns.org>
* Based on code written by:
* Frodo Looijaard <frodol@dds.nl>,
* Philip Edelbrock <phil@netroedge.com>,
* Ralph Metzler <rjkm@thp.uni-koeln.de>, and
* Mark D. Studebaker <mdsxyz123@yahoo.com>
* Simon Vogl
* and others
*
* Please read the lm_sensors documentation for details on use.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* 18-05-2003 HVE - created
* 14-06-2003 HVE - adapted for lm_sensors2
* 17-06-2003 HVE - linux 2.5.xx compatible
* 18-06-2003 HVE - codingstyle
* 21-06-2003 HVE - compatibility lm_sensors2 and linux 2.5.xx
* codingstyle, mmio enabled
*
* This driver interfaces to the I2C bus of the VIA north bridge embedded
* ProSavage4/8 devices. Usefull for gaining access to the TV Encoder chips.
*
* Graphics cores:
* S3/VIA KM266/VT8375 aka ProSavage8
* S3/VIA KM133/VT8365 aka Savage4
*
* Two serial busses are implemented:
* SERIAL1 - I2C serial communications interface
* SERIAL2 - DDC2 monitor communications interface
*
* Tested on a FX41 mainboard, see http://www.shuttle.com
*
*
* TODO:
* - integration with prosavage framebuffer device
* (Additional documentation needed :(
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <asm/io.h>
/*
* driver configuration
*/
#define MAX_BUSSES 2
struct s_i2c_bus {
void __iomem *mmvga;
int i2c_reg;
int adap_ok;
struct i2c_adapter adap;
struct i2c_algo_bit_data algo;
};
struct s_i2c_chip {
void __iomem *mmio;
struct s_i2c_bus i2c_bus[MAX_BUSSES];
};
/*
* i2c configuration
*/
#define CYCLE_DELAY 10
#define TIMEOUT (HZ / 2)
/*
* S3/VIA 8365/8375 registers
*/
#define VGA_CR_IX 0x3d4
#define VGA_CR_DATA 0x3d5
#define CR_SERIAL1 0xa0 /* I2C serial communications interface */
#define MM_SERIAL1 0xff20
#define CR_SERIAL2 0xb1 /* DDC2 monitor communications interface */
/* based on vt8365 documentation */
#define I2C_ENAB 0x10
#define I2C_SCL_OUT 0x01
#define I2C_SDA_OUT 0x02
#define I2C_SCL_IN 0x04
#define I2C_SDA_IN 0x08
#define SET_CR_IX(p, val) writeb((val), (p)->mmvga + VGA_CR_IX)
#define SET_CR_DATA(p, val) writeb((val), (p)->mmvga + VGA_CR_DATA)
#define GET_CR_DATA(p) readb((p)->mmvga + VGA_CR_DATA)
/*
* Serial bus line handling
*
* serial communications register as parameter in private data
*
* TODO: locks with other code sections accessing video registers?
*/
static void bit_s3via_setscl(void *bus, int val)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
unsigned int r;
SET_CR_IX(p, p->i2c_reg);
r = GET_CR_DATA(p);
r |= I2C_ENAB;
if (val) {
r |= I2C_SCL_OUT;
} else {
r &= ~I2C_SCL_OUT;
}
SET_CR_DATA(p, r);
}
static void bit_s3via_setsda(void *bus, int val)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
unsigned int r;
SET_CR_IX(p, p->i2c_reg);
r = GET_CR_DATA(p);
r |= I2C_ENAB;
if (val) {
r |= I2C_SDA_OUT;
} else {
r &= ~I2C_SDA_OUT;
}
SET_CR_DATA(p, r);
}
static int bit_s3via_getscl(void *bus)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
SET_CR_IX(p, p->i2c_reg);
return (0 != (GET_CR_DATA(p) & I2C_SCL_IN));
}
static int bit_s3via_getsda(void *bus)
{
struct s_i2c_bus *p = (struct s_i2c_bus *)bus;
SET_CR_IX(p, p->i2c_reg);
return (0 != (GET_CR_DATA(p) & I2C_SDA_IN));
}
/*
* adapter initialisation
*/
static int i2c_register_bus(struct pci_dev *dev, struct s_i2c_bus *p, void __iomem *mmvga, u32 i2c_reg)
{
int ret;
p->adap.owner = THIS_MODULE;
p->adap.id = I2C_HW_B_S3VIA;
p->adap.algo_data = &p->algo;
p->adap.dev.parent = &dev->dev;
p->algo.setsda = bit_s3via_setsda;
p->algo.setscl = bit_s3via_setscl;
p->algo.getsda = bit_s3via_getsda;
p->algo.getscl = bit_s3via_getscl;
p->algo.udelay = CYCLE_DELAY;
p->algo.timeout = TIMEOUT;
p->algo.data = p;
p->mmvga = mmvga;
p->i2c_reg = i2c_reg;
ret = i2c_bit_add_bus(&p->adap);
if (ret) {
return ret;
}
p->adap_ok = 1;
return 0;
}
/*
* Cleanup stuff
*/
static void prosavage_remove(struct pci_dev *dev)
{
struct s_i2c_chip *chip;
int i, ret;
chip = (struct s_i2c_chip *)pci_get_drvdata(dev);
if (!chip) {
return;
}
for (i = MAX_BUSSES - 1; i >= 0; i--) {
if (chip->i2c_bus[i].adap_ok == 0)
continue;
ret = i2c_bit_del_bus(&chip->i2c_bus[i].adap);
if (ret) {
dev_err(&dev->dev, "%s not removed\n",
chip->i2c_bus[i].adap.name);
}
}
if (chip->mmio) {
iounmap(chip->mmio);
}
kfree(chip);
}
/*
* Detect chip and initialize it
*/
static int __devinit prosavage_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int ret;
unsigned long base, len;
struct s_i2c_chip *chip;
struct s_i2c_bus *bus;
pci_set_drvdata(dev, kzalloc(sizeof(struct s_i2c_chip), GFP_KERNEL));
chip = (struct s_i2c_chip *)pci_get_drvdata(dev);
if (chip == NULL) {
return -ENOMEM;
}
base = dev->resource[0].start & PCI_BASE_ADDRESS_MEM_MASK;
len = dev->resource[0].end - base + 1;
chip->mmio = ioremap_nocache(base, len);
if (chip->mmio == NULL) {
dev_err(&dev->dev, "ioremap failed\n");
prosavage_remove(dev);
return -ENODEV;
}
/*
* Chip initialisation
*/
/* Unlock Extended IO Space ??? */
/*
* i2c bus registration
*/
bus = &chip->i2c_bus[0];
snprintf(bus->adap.name, sizeof(bus->adap.name),
"ProSavage I2C bus at %02x:%02x.%x",
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL1);
if (ret) {
goto err_adap;
}
/*
* ddc bus registration
*/
bus = &chip->i2c_bus[1];
snprintf(bus->adap.name, sizeof(bus->adap.name),
"ProSavage DDC bus at %02x:%02x.%x",
dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
ret = i2c_register_bus(dev, bus, chip->mmio + 0x8000, CR_SERIAL2);
if (ret) {
goto err_adap;
}
return 0;
err_adap:
dev_err(&dev->dev, "%s failed\n", bus->adap.name);
prosavage_remove(dev);
return ret;
}
/*
* Data for PCI driver interface
*/
static struct pci_device_id prosavage_pci_tbl[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_SAVAGE4) },
{ PCI_DEVICE(PCI_VENDOR_ID_S3, PCI_DEVICE_ID_S3_PROSAVAGE8) },
{ 0, },
};
MODULE_DEVICE_TABLE (pci, prosavage_pci_tbl);
static struct pci_driver prosavage_driver = {
.name = "prosavage_smbus",
.id_table = prosavage_pci_tbl,
.probe = prosavage_probe,
.remove = prosavage_remove,
};
static int __init i2c_prosavage_init(void)
{
return pci_register_driver(&prosavage_driver);
}
static void __exit i2c_prosavage_exit(void)
{
pci_unregister_driver(&prosavage_driver);
}
MODULE_DEVICE_TABLE(pci, prosavage_pci_tbl);
MODULE_AUTHOR("Henk Vergonet");
MODULE_DESCRIPTION("ProSavage VIA 8365/8375 smbus driver");
MODULE_LICENSE("GPL");
module_init (i2c_prosavage_init);
module_exit (i2c_prosavage_exit);
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