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yaml
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r: 8235
b: refs/heads/master
c: 74f6ae8
h: refs/heads/master
i:
  8233: e787272
  8231: a4a7c74
v: v3
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Antonino A. Daplas authored and Linus Torvalds committed Sep 9, 2005
1 parent e1a8dc9 commit d7d7fb9
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Showing 7 changed files with 430 additions and 46 deletions.
2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: 829e79b680210c4f4de435af6e1f90451922fc7d
refs/heads/master: 74f6ae84b2315c2fa8a4110b09a1c0f3dca92674
6 changes: 6 additions & 0 deletions trunk/drivers/video/Kconfig
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Expand Up @@ -751,6 +751,12 @@ config FB_I810_GTF

If unsure, say N.

config FB_I810_I2C
bool "Enable DDC Support"
depends on FB_I810 && I2C && FB_I810_GTF
select I2C_ALGOBIT
help

config FB_INTEL
tristate "Intel 830M/845G/852GM/855GM/865G support (EXPERIMENTAL)"
depends on FB && EXPERIMENTAL && PCI && X86 && !X86_64
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5 changes: 4 additions & 1 deletion trunk/drivers/video/i810/Makefile
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Expand Up @@ -4,11 +4,14 @@

obj-$(CONFIG_FB_I810) += i810fb.o


i810fb-objs := i810_main.o i810_accel.o

ifdef CONFIG_FB_I810_GTF
i810fb-objs += i810_gtf.o
else
i810fb-objs += i810_dvt.o
endif

ifdef CONFIG_FB_I810_I2C
i810fb-objs += i810-i2c.o
endif
257 changes: 257 additions & 0 deletions trunk/drivers/video/i810/i810-i2c.c
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@@ -0,0 +1,257 @@
/*-*- linux-c -*-
* linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support
*
* Copyright (C) 2004 Antonino Daplas<adaplas@pol.net>
* All Rights Reserved
*
* 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 "i810.h"
#include "i810_regs.h"
#include "../edid.h"

#define I810_DDC 0x50
/* bit locations in the registers */
#define SCL_DIR_MASK 0x0001
#define SCL_DIR 0x0002
#define SCL_VAL_MASK 0x0004
#define SCL_VAL_OUT 0x0008
#define SCL_VAL_IN 0x0010
#define SDA_DIR_MASK 0x0100
#define SDA_DIR 0x0200
#define SDA_VAL_MASK 0x0400
#define SDA_VAL_OUT 0x0800
#define SDA_VAL_IN 0x1000

#define DEBUG /* define this for verbose EDID parsing output */

#ifdef DEBUG
#define DPRINTK(fmt, args...) printk(fmt,## args)
#else
#define DPRINTK(fmt, args...)
#endif

static void i810i2c_setscl(void *data, int state)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOB, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
SCL_DIR_MASK | SCL_VAL_MASK);
i810_readl(mmio, GPIOB); /* flush posted write */
}

static void i810i2c_setsda(void *data, int state)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOB, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
SDA_DIR_MASK | SDA_VAL_MASK);
i810_readl(mmio, GPIOB); /* flush posted write */
}

static int i810i2c_getscl(void *data)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOB, SCL_DIR_MASK);
i810_writel(mmio, GPIOB, 0);
return (0 != (i810_readl(mmio, GPIOB) & SCL_VAL_IN));
}

static int i810i2c_getsda(void *data)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOB, SDA_DIR_MASK);
i810_writel(mmio, GPIOB, 0);
return (0 != (i810_readl(mmio, GPIOB) & SDA_VAL_IN));
}

static void i810ddc_setscl(void *data, int state)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOA, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
SCL_DIR_MASK | SCL_VAL_MASK);
i810_readl(mmio, GPIOA); /* flush posted write */
}

static void i810ddc_setsda(void *data, int state)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOA, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
SDA_DIR_MASK | SDA_VAL_MASK);
i810_readl(mmio, GPIOA); /* flush posted write */
}

static int i810ddc_getscl(void *data)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOA, SCL_DIR_MASK);
i810_writel(mmio, GPIOA, 0);
return (0 != (i810_readl(mmio, GPIOA) & SCL_VAL_IN));
}

static int i810ddc_getsda(void *data)
{
struct i810fb_i2c_chan *chan = (struct i810fb_i2c_chan *)data;
struct i810fb_par *par = chan->par;
u8 *mmio = par->mmio_start_virtual;

i810_writel(mmio, GPIOA, SDA_DIR_MASK);
i810_writel(mmio, GPIOA, 0);
return (0 != (i810_readl(mmio, GPIOA) & SDA_VAL_IN));
}

#define I2C_ALGO_DDC_I810 0x0e0000
#define I2C_ALGO_I2C_I810 0x0f0000
static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name,
int conn)
{
int rc;

strcpy(chan->adapter.name, name);
chan->adapter.owner = THIS_MODULE;
chan->adapter.algo_data = &chan->algo;
chan->adapter.dev.parent = &chan->par->dev->dev;
switch (conn) {
case 1:
chan->adapter.id = I2C_ALGO_DDC_I810;
chan->algo.setsda = i810ddc_setsda;
chan->algo.setscl = i810ddc_setscl;
chan->algo.getsda = i810ddc_getsda;
chan->algo.getscl = i810ddc_getscl;
break;
case 2:
chan->adapter.id = I2C_ALGO_I2C_I810;
chan->algo.setsda = i810i2c_setsda;
chan->algo.setscl = i810i2c_setscl;
chan->algo.getsda = i810i2c_getsda;
chan->algo.getscl = i810i2c_getscl;
break;
}
chan->algo.udelay = 10;
chan->algo.mdelay = 10;
chan->algo.timeout = (HZ/2);
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 = i2c_bit_add_bus(&chan->adapter);
if (rc == 0)
dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
else
dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
"%s.\n", name);
return rc;
}

void i810_create_i2c_busses(struct i810fb_par *par)
{
par->chan[0].par = par;
par->chan[1].par = par;
i810_setup_i2c_bus(&par->chan[0], "I810-DDC", 1);
i810_setup_i2c_bus(&par->chan[1], "I810-I2C", 2);
}

void i810_delete_i2c_busses(struct i810fb_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;
}

static u8 *i810_do_probe_i2c_edid(struct i810fb_i2c_chan *chan)
{
u8 start = 0x0;
struct i2c_msg msgs[] = {
{
.addr = I810_DDC,
.len = 1,
.buf = &start,
}, {
.addr = I810_DDC,
.flags = I2C_M_RD,
.len = EDID_LENGTH,
},
};
u8 *buf;

buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (!buf) {
DPRINTK("i810-i2c: Failed to allocate memory\n");
return NULL;
}
msgs[1].buf = buf;

if (i2c_transfer(&chan->adapter, msgs, 2) == 2) {
DPRINTK("i810-i2c: I2C Transfer successful\n");
return buf;
}
DPRINTK("i810-i2c: Unable to read EDID block.\n");
kfree(buf);
return NULL;
}

int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn)
{
struct i810fb_par *par = info->par;
u8 *edid = NULL;
int i;

DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn);
if (conn < 3) {
for (i = 0; i < 3; i++) {
/* Do the real work */
edid = i810_do_probe_i2c_edid(&par->chan[conn-1]);
if (edid)
break;
}
} else {
DPRINTK("i810-i2c: Getting EDID from BIOS\n");
edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (edid)
memcpy(edid, fb_firmware_edid(info->device),
EDID_LENGTH);
}

if (out_edid)
*out_edid = edid;

return (edid) ? 0 : 1;
}


13 changes: 13 additions & 0 deletions trunk/drivers/video/i810/i810.h
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Expand Up @@ -16,6 +16,9 @@
#include <linux/list.h>
#include <linux/agp_backend.h>
#include <linux/fb.h>
#include <linux/i2c.h>
#include <linux/i2c-id.h>
#include <linux/i2c-algo-bit.h>
#include <video/vga.h>

/* Fence */
Expand Down Expand Up @@ -240,6 +243,14 @@ struct state_registers {
u8 cr39, cr41, cr70, sr01, msr;
};

struct i810fb_par;

struct i810fb_i2c_chan {
struct i810fb_par *par;
struct i2c_adapter adapter;
struct i2c_algo_bit_data algo;
};

struct i810fb_par {
struct mode_registers regs;
struct state_registers hw_state;
Expand All @@ -251,10 +262,12 @@ struct i810fb_par {
struct heap_data iring;
struct heap_data cursor_heap;
struct vgastate state;
struct i810fb_i2c_chan chan[2];
atomic_t use_count;
u32 pseudo_palette[17];
unsigned long mmio_start_phys;
u8 __iomem *mmio_start_virtual;
u8 *edid;
u32 pitch;
u32 pixconf;
u32 watermark;
Expand Down
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