From f10f8821014bc7a05e8bbc9f199e0f60b1541a0e Mon Sep 17 00:00:00 2001
From: Jon Smirl <jonsmirl@yahoo.com>
Date: Fri, 17 Sep 2004 04:25:19 +0000
Subject: [PATCH] Add the two GPL licensed I2C support files.

---
 linux/radeon_gpl.h |  29 ++++++++++
 linux/radeon_i2c.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 181 insertions(+)
 create mode 100644 linux/radeon_gpl.h
 create mode 100644 linux/radeon_i2c.c

diff --git a/linux/radeon_gpl.h b/linux/radeon_gpl.h
new file mode 100644
index 0000000..e8c479a
--- /dev/null
+++ b/linux/radeon_gpl.h
@@ -0,0 +1,29 @@
+/*
+ * linux/radeon_gpl.h
+ *
+ * Original author probably Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ * or Kronos <kronos@kronoz.cjb.net>
+ * Based on Xfree sources
+ * (C) Copyright 2004 Jon Smirl <jonsmirl@gmail.com>
+ *
+ * This is a GPL licensed file from the Linux kernel, don't add it to the BSD build
+ *
+ * Radeon I2C support routines
+ *
+ */
+
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/i2c-algo-bit.h>
+
+struct radeon_i2c_chan {
+	drm_device_t 			*dev;
+	u32		 		ddc_reg;
+	struct i2c_adapter		adapter;
+	struct i2c_algo_bit_data	algo;
+};
+
+extern int radeon_create_i2c_busses(drm_device_t *dev);
+extern void radeon_delete_i2c_busses(drm_device_t *dev);
+
+ 
diff --git a/linux/radeon_i2c.c b/linux/radeon_i2c.c
new file mode 100644
index 0000000..a68b9ee
--- /dev/null
+++ b/linux/radeon_i2c.c
@@ -0,0 +1,152 @@
+/*
+ * linux/radeon_i2c.c
+ *
+ * Original author probably Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ * or Kronos <kronos@kronoz.cjb.net>
+ * Based on Xfree sources
+ * (C) Copyright 2004 Jon Smirl <jonsmirl@gmail.com>
+ *
+ * This is a GPL licensed file from the Linux kernel, don't add it to the BSD build
+ *
+ * Radeon I2C support routines
+ *
+ */
+
+#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 <asm/io.h>
+#include <video/radeon.h>
+
+#include "radeon.h"
+#include "drmP.h"
+#include "drm.h"
+#include "radeon_drm.h"
+#include "radeon_drv.h"
+
+static void gpio_setscl(void* data, int state)
+{
+	struct radeon_i2c_chan *chan = data;
+	drm_radeon_private_t *dev_priv = chan->dev->dev_private;
+	u32 val;
+
+	val = RADEON_READ(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN);
+	if (!state)
+		val |= VGA_DDC_CLK_OUT_EN;
+
+	RADEON_WRITE(chan->ddc_reg, val);
+	(void)RADEON_READ(chan->ddc_reg);
+}
+
+static void gpio_setsda(void* data, int state)
+{
+	struct radeon_i2c_chan *chan = data;
+	drm_radeon_private_t *dev_priv = chan->dev->dev_private;
+	u32 val;
+
+	val = RADEON_READ(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN);
+	if (!state)
+		val |= VGA_DDC_DATA_OUT_EN;
+
+	RADEON_WRITE(chan->ddc_reg, val);
+	(void)RADEON_READ(chan->ddc_reg);
+}
+
+static int gpio_getscl(void* data)
+{
+	struct radeon_i2c_chan *chan = data;
+	drm_radeon_private_t *dev_priv = chan->dev->dev_private;
+	u32 val;
+
+	val = RADEON_READ(chan->ddc_reg);
+
+	return (val & VGA_DDC_CLK_INPUT) ? 1 : 0;
+}
+
+static int gpio_getsda(void* data)
+{
+	struct radeon_i2c_chan *chan = data;
+	drm_radeon_private_t *dev_priv = chan->dev->dev_private;
+	u32 val;
+	
+	val = RADEON_READ(chan->ddc_reg);
+
+	return (val & VGA_DDC_DATA_INPUT) ? 1 : 0;
+}
+
+static int 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_ALGO_ATI;
+	chan->adapter.algo_data		= &chan->algo;
+	chan->adapter.dev.parent	= &chan->dev->pdev->dev;
+	chan->algo.setsda		= gpio_setsda;
+	chan->algo.setscl		= gpio_setscl;
+	chan->algo.getsda		= gpio_getsda;
+	chan->algo.getscl		= gpio_getscl;
+	chan->algo.udelay		= 40;
+	chan->algo.timeout		= 20;
+	chan->algo.data 		= chan;	
+
+	i2c_set_adapdata(&chan->adapter, chan);
+
+	/* Raise SCL and SDA */
+	gpio_setsda(chan, 1);
+	gpio_setscl(chan, 1);
+	udelay(20);
+
+	rc = i2c_bit_add_bus(&chan->adapter);
+	if (rc == 0)
+		DRM_DEBUG("I2C bus %s registered.\n", name);
+	else
+		DRM_ERROR("Failed to register I2C bus %s.\n", name);
+	return rc;
+}
+
+int radeon_create_i2c_busses(drm_device_t *dev)
+{
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	int ret;
+
+	dev_priv->i2c[0].dev = dev;
+	dev_priv->i2c[0].ddc_reg = GPIO_MONID;
+	if ((ret = setup_i2c_bus(&dev_priv->i2c[0], "monid")))
+		return ret;
+
+	dev_priv->i2c[1].dev = dev;
+	dev_priv->i2c[1].ddc_reg = GPIO_DVI_DDC;
+	if ((ret = setup_i2c_bus(&dev_priv->i2c[1], "dvi")))
+		return ret;
+
+	dev_priv->i2c[2].dev = dev;
+	dev_priv->i2c[2].ddc_reg = GPIO_VGA_DDC;
+	if ((ret = setup_i2c_bus(&dev_priv->i2c[2], "vga")))
+		return ret;
+
+	dev_priv->i2c[3].dev = dev;
+	dev_priv->i2c[3].ddc_reg = GPIO_CRT2_DDC;
+	if ((ret = setup_i2c_bus(&dev_priv->i2c[3], "crt2")))
+		return ret;
+	return 0;
+}
+
+void radeon_delete_i2c_busses(drm_device_t *dev)
+{
+	drm_radeon_private_t *dev_priv = dev->dev_private;
+	int i, ret;
+	
+	for (i = 0; i < 4; i++) {
+		if (dev_priv->i2c[i].dev) {
+			ret = i2c_bit_del_bus(&dev_priv->i2c[i].adapter);
+		}
+		dev_priv->i2c[i].dev = NULL;
+	}
+}
-- 
2.7.4