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linux/drivers/video/aty/radeon_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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#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/i2c.h>
#include <linux/i2c-id.h>
#include <linux/i2c-algo-bit.h>
#include <asm/io.h>
#include <video/radeon.h>
#include "radeonfb.h"
#include "../edid.h"
#define RADEON_DDC 0x50
static void radeon_gpio_setscl(void* data, int state)
{
struct radeon_i2c_chan *chan = data;
struct radeonfb_info *rinfo = chan->rinfo;
u32 val;
val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
if (!state)
val |= VGA_DDC_CLK_OUT_EN;
OUTREG(chan->ddc_reg, val);
(void)INREG(chan->ddc_reg);
}
static void radeon_gpio_setsda(void* data, int state)
{
struct radeon_i2c_chan *chan = data;
struct radeonfb_info *rinfo = chan->rinfo;
u32 val;
val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
if (!state)
val |= VGA_DDC_DATA_OUT_EN;
OUTREG(chan->ddc_reg, val);
(void)INREG(chan->ddc_reg);
}
static int radeon_gpio_getscl(void* data)
{
struct radeon_i2c_chan *chan = data;
struct radeonfb_info *rinfo = chan->rinfo;
u32 val;
val = INREG(chan->ddc_reg);
return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
}
static int radeon_gpio_getsda(void* data)
{
struct radeon_i2c_chan *chan = data;
struct radeonfb_info *rinfo = chan->rinfo;
u32 val;
val = INREG(chan->ddc_reg);
return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
}
static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name)
{
int rc;
strcpy(chan->adapter.name, name);
chan->adapter.owner = THIS_MODULE;
chan->adapter.id = I2C_HW_B_RADEON;
chan->adapter.algo_data = &chan->algo;
chan->adapter.dev.parent = &chan->rinfo->pdev->dev;
chan->algo.setsda = radeon_gpio_setsda;
chan->algo.setscl = radeon_gpio_setscl;
chan->algo.getsda = radeon_gpio_getsda;
chan->algo.getscl = radeon_gpio_getscl;
chan->algo.udelay = 40;
chan->algo.timeout = 20;
chan->algo.data = chan;
i2c_set_adapdata(&chan->adapter, chan);
/* Raise SCL and SDA */
radeon_gpio_setsda(chan, 1);
radeon_gpio_setscl(chan, 1);
udelay(20);
rc = i2c_bit_add_bus(&chan->adapter);
if (rc == 0)
dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name);
else
dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name);
return rc;
}
void radeon_create_i2c_busses(struct radeonfb_info *rinfo)
{
rinfo->i2c[0].rinfo = rinfo;
rinfo->i2c[0].ddc_reg = GPIO_MONID;
radeon_setup_i2c_bus(&rinfo->i2c[0], "monid");
rinfo->i2c[1].rinfo = rinfo;
rinfo->i2c[1].ddc_reg = GPIO_DVI_DDC;
radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi");
rinfo->i2c[2].rinfo = rinfo;
rinfo->i2c[2].ddc_reg = GPIO_VGA_DDC;
radeon_setup_i2c_bus(&rinfo->i2c[2], "vga");
rinfo->i2c[3].rinfo = rinfo;
rinfo->i2c[3].ddc_reg = GPIO_CRT2_DDC;
radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2");
}
void radeon_delete_i2c_busses(struct radeonfb_info *rinfo)
{
if (rinfo->i2c[0].rinfo)
i2c_bit_del_bus(&rinfo->i2c[0].adapter);
rinfo->i2c[0].rinfo = NULL;
if (rinfo->i2c[1].rinfo)
i2c_bit_del_bus(&rinfo->i2c[1].adapter);
rinfo->i2c[1].rinfo = NULL;
if (rinfo->i2c[2].rinfo)
i2c_bit_del_bus(&rinfo->i2c[2].adapter);
rinfo->i2c[2].rinfo = NULL;
if (rinfo->i2c[3].rinfo)
i2c_bit_del_bus(&rinfo->i2c[3].adapter);
rinfo->i2c[3].rinfo = NULL;
}
static u8 *radeon_do_probe_i2c_edid(struct radeon_i2c_chan *chan)
{
u8 start = 0x0;
struct i2c_msg msgs[] = {
{
.addr = RADEON_DDC,
.len = 1,
.buf = &start,
}, {
.addr = RADEON_DDC,
.flags = I2C_M_RD,
.len = EDID_LENGTH,
},
};
u8 *buf;
buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (!buf) {
dev_warn(&chan->rinfo->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->rinfo->pdev->dev, "Unable to read EDID block.\n");
kfree(buf);
return NULL;
}
int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn, u8 **out_edid)
{
u32 reg = rinfo->i2c[conn-1].ddc_reg;
u8 *edid = NULL;
int i, j;
OUTREG(reg, INREG(reg) &
~(VGA_DDC_DATA_OUTPUT | VGA_DDC_CLK_OUTPUT));
OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
(void)INREG(reg);
for (i = 0; i < 3; i++) {
/* For some old monitors we need the
* following process to initialize/stop DDC
*/
OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
(void)INREG(reg);
msleep(13);
OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
(void)INREG(reg);
for (j = 0; j < 5; j++) {
msleep(10);
if (INREG(reg) & VGA_DDC_CLK_INPUT)
break;
}
if (j == 5)
continue;
OUTREG(reg, INREG(reg) | VGA_DDC_DATA_OUT_EN);
(void)INREG(reg);
msleep(15);
OUTREG(reg, INREG(reg) | VGA_DDC_CLK_OUT_EN);
(void)INREG(reg);
msleep(15);
OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
(void)INREG(reg);
msleep(15);
/* Do the real work */
edid = radeon_do_probe_i2c_edid(&rinfo->i2c[conn-1]);
OUTREG(reg, INREG(reg) |
(VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
(void)INREG(reg);
msleep(15);
OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN));
(void)INREG(reg);
for (j = 0; j < 10; j++) {
msleep(10);
if (INREG(reg) & VGA_DDC_CLK_INPUT)
break;
}
OUTREG(reg, INREG(reg) & ~(VGA_DDC_DATA_OUT_EN));
(void)INREG(reg);
msleep(15);
OUTREG(reg, INREG(reg) |
(VGA_DDC_DATA_OUT_EN | VGA_DDC_CLK_OUT_EN));
(void)INREG(reg);
if (edid)
break;
}
/* Release the DDC lines when done or the Apple Cinema HD display
* will switch off
*/
OUTREG(reg, INREG(reg) & ~(VGA_DDC_CLK_OUT_EN | VGA_DDC_DATA_OUT_EN));
(void)INREG(reg);
if (out_edid)
*out_edid = edid;
if (!edid) {
RTRACE("radeonfb: I2C (port %d) ... not found\n", conn);
return MT_NONE;
}
if (edid[0x14] & 0x80) {
/* Fix detection using BIOS tables */
if (rinfo->is_mobility /*&& conn == ddc_dvi*/ &&
(INREG(LVDS_GEN_CNTL) & LVDS_ON)) {
RTRACE("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
return MT_LCD;
} else {
RTRACE("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
return MT_DFP;
}
}
RTRACE("radeonfb: I2C (port %d) ... found CRT display\n", conn);
return MT_CRT;
}
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