drm/nouveau: Add support for I2C hardware monitoring devices.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_i2c.c

@@ -299,7 +299,10 @@ nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr)
 
 int
 nouveau_i2c_identify(struct drm_device *dev, const char *what,
-		     struct i2c_board_info *info, int index)
+		     struct i2c_board_info *info,
+		     bool (*match)(struct nouveau_i2c_chan *,
+				   struct i2c_board_info *),
+		     int index)
 {
 	struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index);
 	int i;
@@ -307,7 +310,8 @@ nouveau_i2c_identify(struct drm_device *dev, const char *what,
 	NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, index);
 
 	for (i = 0; info[i].addr; i++) {
-		if (nouveau_probe_i2c_addr(i2c, info[i].addr)) {
+		if (nouveau_probe_i2c_addr(i2c, info[i].addr) &&
+		    (!match || match(i2c, &info[i]))) {
 			NV_INFO(dev, "Detected %s: %s\n", what, info[i].type);
 			return i;
 		}

drivers/gpu/drm/nouveau/nouveau_i2c.h

@@ -44,7 +44,10 @@ void nouveau_i2c_fini(struct drm_device *, struct dcb_i2c_entry *);
 struct nouveau_i2c_chan *nouveau_i2c_find(struct drm_device *, int index);
 bool nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr);
 int nouveau_i2c_identify(struct drm_device *dev, const char *what,
-			 struct i2c_board_info *info, int index);
+			 struct i2c_board_info *info,
+			 bool (*match)(struct nouveau_i2c_chan *,
+				       struct i2c_board_info *),
+			 int index);
 
 extern const struct i2c_algorithm nouveau_dp_i2c_algo;
 

drivers/gpu/drm/nouveau/nouveau_temp.c

@@ -235,6 +235,48 @@ nouveau_temp_safety_checks(struct drm_device *dev)
 		temps->fan_boost = 40;
 }
 
+static bool
+probe_monitoring_device(struct nouveau_i2c_chan *i2c,
+			struct i2c_board_info *info)
+{
+	char modalias[16] = "i2c:";
+	struct i2c_client *client;
+
+	strlcat(modalias, info->type, sizeof(modalias));
+	request_module(modalias);
+
+	client = i2c_new_device(&i2c->adapter, info);
+	if (!client)
+		return false;
+
+	if (!client->driver || client->driver->detect(client, info)) {
+		i2c_unregister_device(client);
+		return false;
+	}
+
+	return true;
+}
+
+static void
+nouveau_temp_probe_i2c(struct drm_device *dev)
+{
+	struct drm_nouveau_private *dev_priv = dev->dev_private;
+	struct dcb_table *dcb = &dev_priv->vbios.dcb;
+	struct i2c_board_info info[] = {
+		{ I2C_BOARD_INFO("w83l785ts", 0x2d) },
+		{ I2C_BOARD_INFO("w83781d", 0x2d) },
+		{ I2C_BOARD_INFO("f75375", 0x2e) },
+		{ I2C_BOARD_INFO("adt7473", 0x2e) },
+		{ I2C_BOARD_INFO("lm99", 0x4c) },
+		{ }
+	};
+	int idx = (dcb->version >= 0x40 ?
+		   dcb->i2c_default_indices & 0xf : 2);
+
+	nouveau_i2c_identify(dev, "monitoring device", info,
+			     probe_monitoring_device, idx);
+}
+
 void
 nouveau_temp_init(struct drm_device *dev)
 {
@@ -253,11 +295,11 @@ nouveau_temp_init(struct drm_device *dev)
 			temp = ROMPTR(bios, P.data[16]);
 		else
 			NV_WARN(dev, "unknown temp for BIT P %d\n", P.version);
-	} else {
-		NV_WARN(dev, "BMP entry unknown for temperature table.\n");
-	}
 
 		nouveau_temp_vbios_parse(dev, temp);
+	}
+
+	nouveau_temp_probe_i2c(dev);
 }
 
 void

drivers/gpu/drm/nouveau/nv04_dfp.c

@@ -635,7 +635,7 @@ static void nv04_tmds_slave_init(struct drm_encoder *encoder)
 	    get_tmds_slave(encoder))
 		return;
 
-	type = nouveau_i2c_identify(dev, "TMDS transmitter", info, 2);
+	type = nouveau_i2c_identify(dev, "TMDS transmitter", info, NULL, 2);
 	if (type < 0)
 		return;
 

drivers/gpu/drm/nouveau/nv04_tv.c

@@ -49,8 +49,8 @@ static struct i2c_board_info nv04_tv_encoder_info[] = {
 
 int nv04_tv_identify(struct drm_device *dev, int i2c_index)
 {
-	return nouveau_i2c_identify(dev, "TV encoder",
-				    nv04_tv_encoder_info, i2c_index);
+	return nouveau_i2c_identify(dev, "TV encoder", nv04_tv_encoder_info,
+				    NULL, i2c_index);
 }