1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/video/fbdev/nvidia/nv_i2c.c b/drivers/video/fbdev/nvidia/nv_i2c.c
new file mode 100644
index 000000000000..d7994a173245
--- /dev/null
+++ b/drivers/video/fbdev/nvidia/nv_i2c.c
@@ -0,0 +1,171 @@
+/*
+ * linux/drivers/video/nvidia/nvidia-i2c.c - nVidia i2c
+ *
+ * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
+ *
+ * Based on rivafb-i2c.c
+ *
+ * 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 <asm/io.h>
+
+#include "nv_type.h"
+#include "nv_local.h"
+#include "nv_proto.h"
+
+#include "../edid.h"
+
+static void nvidia_gpio_setscl(void *data, int state)
+{
+        struct nvidia_i2c_chan *chan = data;
+        struct nvidia_par *par = chan->par;
+        u32 val;
+
+        val = NVReadCrtc(par, chan->ddc_base + 1) & 0xf0;
+
+        if (state)
+                val |= 0x20;
+        else
+                val &= ~0x20;
+
+        NVWriteCrtc(par, chan->ddc_base + 1, val | 0x01);
+}
+
+static void nvidia_gpio_setsda(void *data, int state)
+{
+        struct nvidia_i2c_chan *chan = data;
+        struct nvidia_par *par = chan->par;
+        u32 val;
+
+        val = NVReadCrtc(par, chan->ddc_base + 1) & 0xf0;
+
+        if (state)
+                val |= 0x10;
+        else
+                val &= ~0x10;
+
+        NVWriteCrtc(par, chan->ddc_base + 1, val | 0x01);
+}
+
+static int nvidia_gpio_getscl(void *data)
+{
+        struct nvidia_i2c_chan *chan = data;
+        struct nvidia_par *par = chan->par;
+        u32 val = 0;
+
+        if (NVReadCrtc(par, chan->ddc_base) & 0x04)
+                val = 1;
+
+        return val;
+}
+
+static int nvidia_gpio_getsda(void *data)
+{
+        struct nvidia_i2c_chan *chan = data;
+        struct nvidia_par *par = chan->par;
+        u32 val = 0;
+
+        if (NVReadCrtc(par, chan->ddc_base) & 0x08)
+                val = 1;
+
+        return val;
+}
+
+static int nvidia_setup_i2c_bus(struct nvidia_i2c_chan *chan, const char *name,
+                                unsigned int i2c_class)
+{
+        int rc;
+
+        strcpy(chan->adapter.name, name);
+        chan->adapter.owner = THIS_MODULE;
+        chan->adapter.class = i2c_class;
+        chan->adapter.algo_data = &chan->algo;
+        chan->adapter.dev.parent = &chan->par->pci_dev->dev;
+        chan->algo.setsda = nvidia_gpio_setsda;
+        chan->algo.setscl = nvidia_gpio_setscl;
+        chan->algo.getsda = nvidia_gpio_getsda;
+        chan->algo.getscl = nvidia_gpio_getscl;
+        chan->algo.udelay = 40;
+        chan->algo.timeout = msecs_to_jiffies(2);
+        chan->algo.data = chan;
+
+        i2c_set_adapdata(&chan->adapter, chan);
+
+        /* Raise SCL and SDA */
+        nvidia_gpio_setsda(chan, 1);
+        nvidia_gpio_setscl(chan, 1);
+        udelay(20);
+
+        rc = i2c_bit_add_bus(&chan->adapter);
+        if (rc == 0)
+                dev_dbg(&chan->par->pci_dev->dev,
+                        "I2C bus %s registered.\n", name);
+        else {
+                dev_warn(&chan->par->pci_dev->dev,
+                         "Failed to register I2C bus %s.\n", name);
+                chan->par = NULL;
+        }
+
+        return rc;
+}
+
+void nvidia_create_i2c_busses(struct nvidia_par *par)
+{
+        par->chan[0].par = par;
+        par->chan[1].par = par;
+        par->chan[2].par = par;
+
+        par->chan[0].ddc_base = (par->reverse_i2c) ? 0x36 : 0x3e;
+        nvidia_setup_i2c_bus(&par->chan[0], "nvidia #0",
+                             (par->reverse_i2c) ? I2C_CLASS_HWMON : 0);
+
+        par->chan[1].ddc_base = (par->reverse_i2c) ? 0x3e : 0x36;
+        nvidia_setup_i2c_bus(&par->chan[1], "nvidia #1",
+                             (par->reverse_i2c) ? 0 : I2C_CLASS_HWMON);
+
+        par->chan[2].ddc_base = 0x50;
+        nvidia_setup_i2c_bus(&par->chan[2], "nvidia #2", 0);
+}
+
+void nvidia_delete_i2c_busses(struct nvidia_par *par)
+{
+        int i;
+
+        for (i = 0; i < 3; i++) {
+                if (!par->chan[i].par)
+                        continue;
+                i2c_del_adapter(&par->chan[i].adapter);
+                par->chan[i].par = NULL;
+        }
+}
+
+int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)
+{
+        struct nvidia_par *par = info->par;
+        u8 *edid = NULL;
+
+        if (par->chan[conn - 1].par)
+                edid = fb_ddc_read(&par->chan[conn - 1].adapter);
+
+        if (!edid && conn == 1) {
+                /* try to get from firmware */
+                const u8 *e = fb_firmware_edid(info->device);
+
+                if (e != NULL)
+                        edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
+        }
+
+        *out_edid = edid;
+
+        return (edid) ? 0 : 1;
+}