[PATCH] i810fb: Add i2c/DDC support

Add ddc/i2c support for i810fb.  This will allow the driver to get display
information, especially for monitors with fickle timings.  The i2c support
depends on CONFIG_FB_I810_GTF.

Changed __init* to __devinit*

Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Alexander Nyberg <alexn@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 257 insertions, 0 deletions

diff --git a/drivers/video/i810/i810-i2c.c b/drivers/video/i810/i810-i2c.c
new file mode 100644
index 000000000000..fda53aac1fc1
--- /dev/null
+++ b/drivers/video/i810/i810-i2c.c
@@ -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;
+}
+
+