From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 drivers/video/fbdev/aty/radeon_i2c.c | 168 +++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 drivers/video/fbdev/aty/radeon_i2c.c

(limited to 'drivers/video/fbdev/aty/radeon_i2c.c')

diff --git a/drivers/video/fbdev/aty/radeon_i2c.c b/drivers/video/fbdev/aty/radeon_i2c.c
new file mode 100644
index 000000000..269b12ebb
--- /dev/null
+++ b/drivers/video/fbdev/aty/radeon_i2c.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "radeonfb.h"
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include <asm/io.h>
+
+#include <video/radeon.h>
+#include "../edid.h"
+
+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;
+
+	snprintf(chan->adapter.name, sizeof(chan->adapter.name),
+		 "radeonfb %s", name);
+	chan->adapter.owner		= THIS_MODULE;
+	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		= 10;
+	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;
+#ifndef CONFIG_PPC
+	rinfo->i2c[0].adapter.class = I2C_CLASS_HWMON;
+#endif
+	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_del_adapter(&rinfo->i2c[0].adapter);
+	rinfo->i2c[0].rinfo = NULL;
+
+	if (rinfo->i2c[1].rinfo)
+		i2c_del_adapter(&rinfo->i2c[1].adapter);
+	rinfo->i2c[1].rinfo = NULL;
+
+	if (rinfo->i2c[2].rinfo)
+		i2c_del_adapter(&rinfo->i2c[2].adapter);
+	rinfo->i2c[2].rinfo = NULL;
+
+	if (rinfo->i2c[3].rinfo)
+		i2c_del_adapter(&rinfo->i2c[3].adapter);
+	rinfo->i2c[3].rinfo = NULL;
+}
+
+int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn,
+			       u8 **out_edid)
+{
+	u8 *edid;
+
+	edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter);
+
+	if (out_edid)
+		*out_edid = edid;
+	if (!edid) {
+		pr_debug("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)) {
+			pr_debug("radeonfb: I2C (port %d) ... found LVDS panel\n", conn);
+			return MT_LCD;
+		} else {
+			pr_debug("radeonfb: I2C (port %d) ... found TMDS panel\n", conn);
+			return MT_DFP;
+		}
+	}
+	pr_debug("radeonfb: I2C (port %d) ... found CRT display\n", conn);
+	return MT_CRT;
+}
+
-- 
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