drm/nouveau/therm: use the EXTDEV table to detect i2c monitoring devices

This commit also adds a static list of all known devices and their possible
i2c addresses.

v2: use the common table parsing technique as suggested by darktama

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/Makefile

@@ -30,6 +30,7 @@ nouveau-y += core/subdev/bios/bit.o
 nouveau-y += core/subdev/bios/conn.o
 nouveau-y += core/subdev/bios/dcb.o
 nouveau-y += core/subdev/bios/dp.o
+nouveau-y += core/subdev/bios/extdev.o
 nouveau-y += core/subdev/bios/gpio.o
 nouveau-y += core/subdev/bios/i2c.o
 nouveau-y += core/subdev/bios/init.o

drivers/gpu/drm/nouveau/core/include/subdev/bios/extdev.h

@@ -0,0 +1,30 @@
+#ifndef __NVBIOS_EXTDEV_H__
+#define __NVBIOS_EXTDEV_H__
+
+struct nouveau_bios;
+
+enum nvbios_extdev_type {
+	NVBIOS_EXTDEV_LM89		= 0x02,
+	NVBIOS_EXTDEV_VT1103M		= 0x40,
+	NVBIOS_EXTDEV_PX3540		= 0x41,
+	NVBIOS_EXTDEV_VT1105M		= 0x42, /* or close enough... */
+	NVBIOS_EXTDEV_ADT7473		= 0x70, /* can also be a LM64 */
+	NVBIOS_EXTDEV_HDCP_EEPROM	= 0x90,
+	NVBIOS_EXTDEV_NONE		= 0xff,
+};
+
+struct nvbios_extdev_func {
+	u8 type;
+	u8 addr;
+	u8 bus;
+};
+
+int
+nvbios_extdev_parse(struct nouveau_bios *, int, struct nvbios_extdev_func *);
+
+int
+nvbios_extdev_find(struct nouveau_bios *, enum nvbios_extdev_type,
+		   struct nvbios_extdev_func *);
+
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/bios/extdev.c

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2012 Nouveau Community
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Martin Peres
+ */
+
+#include <subdev/bios.h>
+#include <subdev/bios/dcb.h>
+#include <subdev/bios/extdev.h>
+
+static u16
+extdev_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
+{
+	u8  dcb_ver, dcb_hdr, dcb_cnt, dcb_len;
+	u16 dcb, extdev = 0;
+
+	dcb = dcb_table(bios, &dcb_ver, &dcb_hdr, &dcb_cnt, &dcb_len);
+	if (!dcb || (dcb_ver != 0x30 && dcb_ver != 0x40))
+		return 0x0000;
+
+	extdev = nv_ro16(bios, dcb + 18);
+	if (!extdev)
+		return 0x0000;
+
+	*ver = nv_ro08(bios, extdev + 0);
+	*hdr = nv_ro08(bios, extdev + 1);
+	*cnt = nv_ro08(bios, extdev + 2);
+	*len = nv_ro08(bios, extdev + 3);
+
+	return extdev + *hdr;
+}
+
+u16
+nvbios_extdev_entry(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len)
+{
+	u8 hdr, cnt;
+	u16 extdev = extdev_table(bios, ver, &hdr, len, &cnt);
+	if (extdev && idx < cnt)
+		return extdev + idx * *len;
+	return 0x0000;
+}
+
+static void
+extdev_parse_entry(struct nouveau_bios *bios, u16 offset,
+			  struct nvbios_extdev_func *entry)
+{
+	entry->type = nv_ro08(bios, offset + 0);
+	entry->addr = nv_ro08(bios, offset + 1);
+	entry->bus = (nv_ro08(bios, offset + 2) >> 4) & 1;
+}
+
+int
+nvbios_extdev_parse(struct nouveau_bios *bios, int idx,
+		    struct nvbios_extdev_func *func)
+{
+	u8 ver, len;
+	u16 entry;
+
+	if (!(entry = nvbios_extdev_entry(bios, idx, &ver, &len)))
+		return -EINVAL;
+
+	extdev_parse_entry(bios, entry, func);
+
+	return 0;
+}
+
+int
+nvbios_extdev_find(struct nouveau_bios *bios, enum nvbios_extdev_type type,
+		   struct nvbios_extdev_func *func)
+{
+	u8 ver, len, i;
+	u16 entry;
+
+	i = 0;
+	while (!(entry = nvbios_extdev_entry(bios, i++, &ver, &len))) {
+		extdev_parse_entry(bios, entry, func);
+		if (func->type == type)
+			return 0;
+	}
+
+	return -EINVAL;
+}

drivers/gpu/drm/nouveau/nouveau_temp.c

@@ -31,6 +31,7 @@
 
 #include <subdev/i2c.h>
 #include <subdev/bios/therm.h>
+#include <subdev/bios/extdev.h>
 
 static int
 nv40_sensor_setup(struct drm_device *dev)
@@ -132,16 +133,58 @@ static void
 nouveau_temp_probe_i2c(struct drm_device *dev)
 {
 	struct nouveau_device *device = nouveau_dev(dev);
+	struct nouveau_bios *bios = nouveau_bios(device);
 	struct nouveau_i2c *i2c = nouveau_i2c(device);
+	struct nvbios_extdev_func extdev_entry;
 	struct i2c_board_info info[] = {
 		{ I2C_BOARD_INFO("w83l785ts", 0x2d) },
 		{ I2C_BOARD_INFO("w83781d", 0x2d) },
 		{ I2C_BOARD_INFO("adt7473", 0x2e) },
+		{ I2C_BOARD_INFO("adt7473", 0x2d) },
+		{ I2C_BOARD_INFO("adt7473", 0x2c) },
 		{ I2C_BOARD_INFO("f75375", 0x2e) },
 		{ I2C_BOARD_INFO("lm99", 0x4c) },
+		{ I2C_BOARD_INFO("lm90", 0x4c) },
+		{ I2C_BOARD_INFO("lm90", 0x4d) },
+		{ I2C_BOARD_INFO("adm1021", 0x18) },
+		{ I2C_BOARD_INFO("adm1021", 0x19) },
+		{ I2C_BOARD_INFO("adm1021", 0x1a) },
+		{ I2C_BOARD_INFO("adm1021", 0x29) },
+		{ I2C_BOARD_INFO("adm1021", 0x2a) },
+		{ I2C_BOARD_INFO("adm1021", 0x2b) },
+		{ I2C_BOARD_INFO("adm1021", 0x4c) },
+		{ I2C_BOARD_INFO("adm1021", 0x4d) },
+		{ I2C_BOARD_INFO("adm1021", 0x4e) },
+		{ I2C_BOARD_INFO("lm63", 0x18) },
+		{ I2C_BOARD_INFO("lm63", 0x4e) },
 		{ }
 	};
 
+	if (!nvbios_extdev_find(bios, NVBIOS_EXTDEV_LM89, &extdev_entry)) {
+		struct i2c_board_info board[] = {
+			{ I2C_BOARD_INFO("lm90", extdev_entry.addr >> 1) },
+			{ }
+		};
+
+		if (i2c->identify(i2c, NV_I2C_DEFAULT(0), "monitoring device",
+				  board, probe_monitoring_device))
+			return;
+	}
+
+	if (!nvbios_extdev_find(bios, NVBIOS_EXTDEV_ADT7473, &extdev_entry)) {
+		struct i2c_board_info board[] = {
+			{ I2C_BOARD_INFO("adt7473", extdev_entry.addr >> 1) },
+			{ }
+		};
+
+		if (i2c->identify(i2c, NV_I2C_DEFAULT(0), "monitoring device",
+				  board, probe_monitoring_device))
+			return;
+	}
+
+	/* The vbios doesn't provide the address of an exisiting monitoring
+	   device. Let's try our static list.
+	 */
 	i2c->identify(i2c, NV_I2C_DEFAULT(0), "monitoring device", info,
 		      probe_monitoring_device);
 }