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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/sched.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"
#define RIVA_DDC 0x50
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;
val = VGA_RD08(par->riva.PCIO, 0x3d5);
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)
{
int rc;
strcpy(chan->adapter.name, name);
chan->adapter.owner = THIS_MODULE;
chan->adapter.id = I2C_HW_B_RIVA;
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->bus = 3;
par->chan[0].par = par;
par->chan[1].par = par;
par->chan[2].par = par;
par->chan[0].ddc_base = 0x3e;
par->chan[1].ddc_base = 0x36;
par->chan[2].ddc_base = 0x50;
riva_setup_i2c_bus(&par->chan[0], "BUS1");
riva_setup_i2c_bus(&par->chan[1], "BUS2");
riva_setup_i2c_bus(&par->chan[2], "BUS3");
}
void riva_delete_i2c_busses(struct riva_par *par)
{
if (par->chan[0].par)
i2c_bit_del_bus(&par->chan[0].adapter);
par->chan[0].par = NULL;
if (par->chan[1].par)
i2c_bit_del_bus(&par->chan[1].adapter);
par->chan[1].par = NULL;
if (par->chan[2].par)
i2c_bit_del_bus(&par->chan[2].adapter);
par->chan[2].par = NULL;
}
static u8 *riva_do_probe_i2c_edid(struct riva_i2c_chan *chan)
{
u8 start = 0x0;
struct i2c_msg msgs[] = {
{
.addr = RIVA_DDC,
.len = 1,
.buf = &start,
}, {
.addr = RIVA_DDC,
.flags = I2C_M_RD,
.len = EDID_LENGTH,
},
};
u8 *buf;
if (!chan->par)
return NULL;
buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (!buf) {
dev_warn(&chan->par->pdev->dev, "Out of memory!\n");
return NULL;
}
msgs[1].buf = buf;
if (i2c_transfer(&chan->adapter, msgs, 2) == 2)
return buf;
dev_dbg(&chan->par->pdev->dev, "Unable to read EDID block.\n");
kfree(buf);
return NULL;
}
int riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid)
{
u8 *edid = NULL;
int i;
for (i = 0; i < 3; i++) {
/* Do the real work */
edid = riva_do_probe_i2c_edid(&par->chan[conn-1]);
if (edid)
break;
}
if (out_edid)
*out_edid = edid;
if (!edid)
return 1;
return 0;
}
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