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path: root/drivers/video/fbdev/nvidia/nv_i2c.c
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Diffstat (limited to 'drivers/video/fbdev/nvidia/nv_i2c.c')
-rw-r--r--drivers/video/fbdev/nvidia/nv_i2c.c171
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;
+}