Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/drivers/video/fbdev/i810/i810-i2c.c b/drivers/video/fbdev/i810/i810-i2c.c
new file mode 100644
index 000000000..7db17d0d8
--- /dev/null
+++ b/drivers/video/fbdev/i810/i810-i2c.c
@@ -0,0 +1,175 @@
+ /*-*- 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/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <linux/pci.h>
+#include <linux/fb.h>
+#include "i810.h"
+#include "i810_regs.h"
+#include "i810_main.h"
+#include "../edid.h"
+
+/* 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 = data;
+        struct i810fb_par         *par = chan->par;
+	u8                        __iomem *mmio = par->mmio_start_virtual;
+
+	if (state)
+		i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK | SCL_VAL_MASK);
+	else
+		i810_writel(mmio, chan->ddc_base, SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
+	i810_readl(mmio, chan->ddc_base);	/* flush posted write */
+}
+
+static void i810i2c_setsda(void *data, int state)
+{
+        struct i810fb_i2c_chan    *chan = data;
+        struct i810fb_par         *par = chan->par;
+	u8                        __iomem *mmio = par->mmio_start_virtual;
+
+	if (state)
+		i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK | SDA_VAL_MASK);
+	else
+		i810_writel(mmio, chan->ddc_base, SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK);
+	i810_readl(mmio, chan->ddc_base);	/* flush posted write */
+}
+
+static int i810i2c_getscl(void *data)
+{
+        struct i810fb_i2c_chan    *chan = data;
+        struct i810fb_par         *par = chan->par;
+	u8                        __iomem *mmio = par->mmio_start_virtual;
+
+	i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
+	i810_writel(mmio, chan->ddc_base, 0);
+	return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
+}
+
+static int i810i2c_getsda(void *data)
+{
+        struct i810fb_i2c_chan    *chan = data;
+        struct i810fb_par         *par = chan->par;
+	u8                        __iomem *mmio = par->mmio_start_virtual;
+
+	i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
+	i810_writel(mmio, chan->ddc_base, 0);
+	return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
+}
+
+static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name)
+{
+        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;
+	chan->algo.setsda               = i810i2c_setsda;
+	chan->algo.setscl               = i810i2c_setscl;
+	chan->algo.getsda               = i810i2c_getsda;
+	chan->algo.getscl               = i810i2c_getscl;
+	chan->algo.udelay               = 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);
+		chan->par = NULL;
+	}
+
+        return rc;
+}
+
+void i810_create_i2c_busses(struct i810fb_par *par)
+{
+        par->chan[0].par        = par;
+	par->chan[1].par        = par;
+	par->chan[2].par        = par;
+
+	par->chan[0].ddc_base = GPIOA;
+	i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
+	par->chan[1].ddc_base = GPIOB;
+	i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
+	par->chan[2].ddc_base = GPIOC;
+	i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
+}
+
+void i810_delete_i2c_busses(struct i810fb_par *par)
+{
+        if (par->chan[0].par)
+		i2c_del_adapter(&par->chan[0].adapter);
+        par->chan[0].par = NULL;
+
+	if (par->chan[1].par)
+		i2c_del_adapter(&par->chan[1].adapter);
+	par->chan[1].par = NULL;
+
+	if (par->chan[2].par)
+		i2c_del_adapter(&par->chan[2].adapter);
+	par->chan[2].par = NULL;
+}
+
+int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn)
+{
+	struct i810fb_par *par = info->par;
+        u8 *edid = NULL;
+
+	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
+	if (conn < par->ddc_num) {
+		edid = fb_ddc_read(&par->chan[conn].adapter);
+	} else {
+		const u8 *e = fb_firmware_edid(info->device);
+
+		if (e != NULL) {
+			DPRINTK("i810-i2c: Getting EDID from BIOS\n");
+			edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
+		}
+	}
+
+	*out_edid = edid;
+
+        return (edid) ? 0 : 1;
+}