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linux/drivers/video/savage/savagefb-i2c.c
Jean Delvare 1684a98430 [PATCH] I2C: Kill i2c_algorithm.id (6/7) 
In theory, there should be no more users of I2C_ALGO_* at this point.
However, it happens that several drivers were using I2C_ALGO_* for
adapter ids, so we need to correct these before we can get rid of all
the I2C_ALGO_* definitions.

Note that this also fixes a bug in media/video/tvaudio.c:

	/* don't attach on saa7146 based cards,
	   because dedicated drivers are used */
	if ((adap->id & I2C_ALGO_SAA7146))
		return 0;

This test was plain broken, as it would succeed for many more adapters
than just the saa7146: any those id would share at least one bit with
the saa7146 id. We are really lucky that the few other adapters we want
this driver to work with did not fulfill that condition.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-09-05 09:14:32 -07:00

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/*
* linux/drivers/video/savage/savagefb-i2c.c - S3 Savage DDC2
*
* Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
*
* Based partly on rivafb-i2c.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/fb.h>
#include <asm/io.h>
#include "savagefb.h"
#define SAVAGE_DDC 0x50
#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 PROSAVAGE_I2C_ENAB 0x10
#define PROSAVAGE_I2C_SCL_OUT 0x01
#define PROSAVAGE_I2C_SDA_OUT 0x02
#define PROSAVAGE_I2C_SCL_IN 0x04
#define PROSAVAGE_I2C_SDA_IN 0x08
#define SAVAGE4_I2C_ENAB 0x00000020
#define SAVAGE4_I2C_SCL_OUT 0x00000001
#define SAVAGE4_I2C_SDA_OUT 0x00000002
#define SAVAGE4_I2C_SCL_IN 0x00000008
#define SAVAGE4_I2C_SDA_IN 0x00000010
#define SET_CR_IX(base, val) writeb((val), base + 0x8000 + VGA_CR_IX)
#define SET_CR_DATA(base, val) writeb((val), base + 0x8000 + VGA_CR_DATA)
#define GET_CR_DATA(base) readb(base + 0x8000 + VGA_CR_DATA)
static void savage4_gpio_setscl(void *data, int val)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
unsigned int r;
r = readl(chan->ioaddr + chan->reg);
if(val)
r |= SAVAGE4_I2C_SCL_OUT;
else
r &= ~SAVAGE4_I2C_SCL_OUT;
writel(r, chan->ioaddr + chan->reg);
readl(chan->ioaddr + chan->reg); /* flush posted write */
}
static void savage4_gpio_setsda(void *data, int val)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
unsigned int r;
r = readl(chan->ioaddr + chan->reg);
if(val)
r |= SAVAGE4_I2C_SDA_OUT;
else
r &= ~SAVAGE4_I2C_SDA_OUT;
writel(r, chan->ioaddr + chan->reg);
readl(chan->ioaddr + chan->reg); /* flush posted write */
}
static int savage4_gpio_getscl(void *data)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SCL_IN));
}
static int savage4_gpio_getsda(void *data)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
return (0 != (readl(chan->ioaddr + chan->reg) & SAVAGE4_I2C_SDA_IN));
}
static void prosavage_gpio_setscl(void* data, int val)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
u32 r;
SET_CR_IX(chan->ioaddr, chan->reg);
r = GET_CR_DATA(chan->ioaddr);
r |= PROSAVAGE_I2C_ENAB;
if (val) {
r |= PROSAVAGE_I2C_SCL_OUT;
} else {
r &= ~PROSAVAGE_I2C_SCL_OUT;
}
SET_CR_DATA(chan->ioaddr, r);
}
static void prosavage_gpio_setsda(void* data, int val)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
unsigned int r;
SET_CR_IX(chan->ioaddr, chan->reg);
r = GET_CR_DATA(chan->ioaddr);
r |= PROSAVAGE_I2C_ENAB;
if (val) {
r |= PROSAVAGE_I2C_SDA_OUT;
} else {
r &= ~PROSAVAGE_I2C_SDA_OUT;
}
SET_CR_DATA(chan->ioaddr, r);
}
static int prosavage_gpio_getscl(void* data)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
SET_CR_IX(chan->ioaddr, chan->reg);
return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SCL_IN));
}
static int prosavage_gpio_getsda(void* data)
{
struct savagefb_i2c_chan *chan = (struct savagefb_i2c_chan *)data;
SET_CR_IX(chan->ioaddr, chan->reg);
return (0 != (GET_CR_DATA(chan->ioaddr) & PROSAVAGE_I2C_SDA_IN));
}
static int savage_setup_i2c_bus(struct savagefb_i2c_chan *chan,
const char *name)
{
int (*add_bus)(struct i2c_adapter *) = symbol_get(i2c_bit_add_bus);
int rc = 0;
if (add_bus && chan->par) {
strcpy(chan->adapter.name, name);
chan->adapter.owner = THIS_MODULE;
chan->adapter.id = I2C_HW_B_SAVAGE;
chan->adapter.algo_data = &chan->algo;
chan->adapter.dev.parent = &chan->par->pcidev->dev;
chan->algo.udelay = 40;
chan->algo.mdelay = 5;
chan->algo.timeout = 20;
chan->algo.data = chan;
i2c_set_adapdata(&chan->adapter, chan);
/* Raise SCL and SDA */
chan->algo.setsda(chan, 1);
chan->algo.setscl(chan, 1);
udelay(20);
rc = add_bus(&chan->adapter);
if (rc == 0)
dev_dbg(&chan->par->pcidev->dev,
"I2C bus %s registered.\n", name);
else
dev_warn(&chan->par->pcidev->dev,
"Failed to register I2C bus %s.\n", name);
symbol_put(i2c_bit_add_bus);
} else
chan->par = NULL;
return rc;
}
void savagefb_create_i2c_busses(struct fb_info *info)
{
struct savagefb_par *par = (struct savagefb_par *)info->par;
par->chan.par = par;
switch(info->fix.accel) {
case FB_ACCEL_PROSAVAGE_DDRK:
case FB_ACCEL_PROSAVAGE_PM:
par->chan.reg = CR_SERIAL2;
par->chan.ioaddr = par->mmio.vbase;
par->chan.algo.setsda = prosavage_gpio_setsda;
par->chan.algo.setscl = prosavage_gpio_setscl;
par->chan.algo.getsda = prosavage_gpio_getsda;
par->chan.algo.getscl = prosavage_gpio_getscl;
break;
case FB_ACCEL_SAVAGE4:
par->chan.reg = 0xff20;
par->chan.ioaddr = par->mmio.vbase;
par->chan.algo.setsda = savage4_gpio_setsda;
par->chan.algo.setscl = savage4_gpio_setscl;
par->chan.algo.getsda = savage4_gpio_getsda;
par->chan.algo.getscl = savage4_gpio_getscl;
break;
default:
par->chan.par = NULL;
}
savage_setup_i2c_bus(&par->chan, "SAVAGE DDC2");
}
void savagefb_delete_i2c_busses(struct fb_info *info)
{
struct savagefb_par *par = (struct savagefb_par *)info->par;
int (*del_bus)(struct i2c_adapter *) =
symbol_get(i2c_bit_del_bus);
if (del_bus && par->chan.par) {
del_bus(&par->chan.adapter);
symbol_put(i2c_bit_del_bus);
}
par->chan.par = NULL;
}
static u8 *savage_do_probe_i2c_edid(struct savagefb_i2c_chan *chan)
{
u8 start = 0x0;
int (*transfer)(struct i2c_adapter *, struct i2c_msg *, int) =
symbol_get(i2c_transfer);
struct i2c_msg msgs[] = {
{
.addr = SAVAGE_DDC,
.len = 1,
.buf = &start,
}, {
.addr = SAVAGE_DDC,
.flags = I2C_M_RD,
.len = EDID_LENGTH,
},
};
u8 *buf = NULL;
if (transfer && chan->par) {
buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (buf) {
msgs[1].buf = buf;
if (transfer(&chan->adapter, msgs, 2) != 2) {
dev_dbg(&chan->par->pcidev->dev,
"Unable to read EDID block.\n");
kfree(buf);
buf = NULL;
}
}
symbol_put(i2c_transfer);
}
return buf;
}
int savagefb_probe_i2c_connector(struct savagefb_par *par, u8 **out_edid)
{
u8 *edid = NULL;
int i;
for (i = 0; i < 3; i++) {
/* Do the real work */
edid = savage_do_probe_i2c_edid(&par->chan);
if (edid)
break;
}
if (out_edid)
*out_edid = edid;
if (!edid)
return 1;
return 0;
}
MODULE_LICENSE("GPL");
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