rivafb-i2c.c
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/*
* linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c
*
* Maintained by Ani Joshi <ajoshi@shell.unixbox.com>
*
* Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
*
* Based on radeonfb-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/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/fb.h>
#include <linux/jiffies.h>
#include <asm/io.h>
#include "rivafb.h"
#include "../edid.h"
static void riva_gpio_setscl(void* data, int state)
{
struct riva_i2c_chan *chan = data;
struct riva_par *par = chan->par;
u32 val;
VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
if (state)
val |= 0x20;
else
val &= ~0x20;
VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
}
static void riva_gpio_setsda(void* data, int state)
{
struct riva_i2c_chan *chan = data;
struct riva_par *par = chan->par;
u32 val;
VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0;
if (state)
val |= 0x10;
else
val &= ~0x10;
VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1);
VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1);
}
static int riva_gpio_getscl(void* data)
{
struct riva_i2c_chan *chan = data;
struct riva_par *par = chan->par;
u32 val = 0;
VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04)
val = 1;
return val;
}
static int riva_gpio_getsda(void* data)
{
struct riva_i2c_chan *chan = data;
struct riva_par *par = chan->par;
u32 val = 0;
VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base);
if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08)
val = 1;
return val;
}
static int riva_setup_i2c_bus(struct riva_i2c_chan *chan, const char *name,
unsigned int i2c_class)
{
int rc;
strcpy(chan->adapter.name, name);
chan->adapter.owner = THIS_MODULE;
chan->adapter.class = i2c_class;
chan->adapter.algo_data = &chan->algo;
chan->adapter.dev.parent = &chan->par->pdev->dev;
chan->algo.setsda = riva_gpio_setsda;
chan->algo.setscl = riva_gpio_setscl;
chan->algo.getsda = riva_gpio_getsda;
chan->algo.getscl = riva_gpio_getscl;
chan->algo.udelay = 40;
chan->algo.timeout = msecs_to_jiffies(2);
chan->algo.data = chan;
i2c_set_adapdata(&chan->adapter, chan);
/* Raise SCL and SDA */
riva_gpio_setsda(chan, 1);
riva_gpio_setscl(chan, 1);
udelay(20);
rc = i2c_bit_add_bus(&chan->adapter);
if (rc == 0)
dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name);
else {
dev_warn(&chan->par->pdev->dev,
"Failed to register I2C bus %s.\n", name);
chan->par = NULL;
}
return rc;
}
void riva_create_i2c_busses(struct riva_par *par)
{
par->chan[0].par = par;
par->chan[1].par = par;
par->chan[2].par = par;
par->chan[0].ddc_base = 0x36;
par->chan[1].ddc_base = 0x3e;
par->chan[2].ddc_base = 0x50;
riva_setup_i2c_bus(&par->chan[0], "BUS1", I2C_CLASS_HWMON);
riva_setup_i2c_bus(&par->chan[1], "BUS2", 0);
riva_setup_i2c_bus(&par->chan[2], "BUS3", 0);
}
void riva_delete_i2c_busses(struct riva_par *par)
{
int i;
for (i = 0; i < 3; i++) {
if (!par->chan[i].par)
continue;
i2c_del_adapter(&par->chan[i].adapter);
par->chan[i].par = NULL;
}
}
int riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)
{
u8 *edid = NULL;
if (par->chan[conn].par)
edid = fb_ddc_read(&par->chan[conn].adapter);
if (out_edid)
*out_edid = edid;
if (!edid)
return 1;
return 0;
}