kernel-ark/drivers/video/riva/rivafb-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

214 lines
4.5 KiB
C

/*
* 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/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 <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 = (struct riva_i2c_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 = (struct riva_i2c_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 = (struct riva_i2c_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 = (struct riva_i2c_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;
}