Merge tag 'for-linus-5.17-1' of https://github.com/cminyard/linux-ipmi

Pull IPMI updates from Corey Minyard:

 - Little fixes for various things people have noticed.

 - One enhancement, the IPMI over IPMB (I2c) is modified to allow it to
   take a separate sender and receiver device. The Raspberry Pi has an
   I2C slave device that cannot send.

* tag 'for-linus-5.17-1' of https://github.com/cminyard/linux-ipmi:
  ipmi: initialize len variable
  ipmi: kcs: aspeed: Remove old bindings support
  ipmi:ipmb: Add the ability to have a separate slave and master device
  ipmi:ipmi_ipmb: Unregister the SMI on remove
  ipmi: kcs: aspeed: Add AST2600 compatible string
  ipmi: ssif: replace strlcpy with strscpy
  ipmi/watchdog: Constify ident
  ipmi: Add the git repository to the MAINTAINERS file

6 files changed, 70 insertions, 72 deletions

diff --git a/Documentation/devicetree/bindings/ipmi/ipmi-ipmb.yaml b/Documentation/devicetree/bindings/ipmi/ipmi-ipmb.yaml
index 93d8f8e88cf56c..71bc031c4fde6e 100644
--- a/Documentation/devicetree/bindings/ipmi/ipmi-ipmb.yaml
+++ b/Documentation/devicetree/bindings/ipmi/ipmi-ipmb.yaml
@@ -36,6 +36,14 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: Number of retries before a failure is declared.  Defaults to 1.
 
+  slave-dev:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: |
+      The slave i2c device.  If not present, the main device is used. This
+      lets you use two devices on the IPMB, one for master and one for slave,
+      in case you have a slave device that can only be a slave.  The slave
+      will receive messages and the master will transmit.
+
 required:
   - compatible
   - reg
diff --git a/MAINTAINERS b/MAINTAINERS
index 2f3056772c3a6b..ea2cd656ee6c71 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10171,6 +10171,7 @@ M:	Corey Minyard <minyard@acm.org>
 L:	openipmi-developer@lists.sourceforge.net (moderated for non-subscribers)
 S:	Supported
 W:	http://openipmi.sourceforge.net/
+T:	git https://github.com/cminyard/linux-ipmi.git for-next
 F:	Documentation/driver-api/ipmi.rst
 F:	Documentation/devicetree/bindings/ipmi/
 F:	drivers/char/ipmi/
diff --git a/drivers/char/ipmi/ipmi_ipmb.c b/drivers/char/ipmi/ipmi_ipmb.c
index ba0c2d2c6bbe0b..b81b862532fb01 100644
--- a/drivers/char/ipmi/ipmi_ipmb.c
+++ b/drivers/char/ipmi/ipmi_ipmb.c
@@ -39,6 +39,7 @@ MODULE_PARM_DESC(max_retries, "Max resends of a command before timing out.");
 struct ipmi_ipmb_dev {
 	struct ipmi_smi *intf;
 	struct i2c_client *client;
+	struct i2c_client *slave;
 
 	struct ipmi_smi_handlers handlers;
 
@@ -257,7 +258,7 @@ static void ipmi_ipmb_format_for_xmit(struct ipmi_ipmb_dev *iidev,
 		memcpy(iidev->xmitmsg + 5, msg->data + 1, msg->data_size - 1);
 		iidev->xmitlen = msg->data_size + 4;
 	}
-	iidev->xmitmsg[3] = iidev->client->addr << 1;
+	iidev->xmitmsg[3] = iidev->slave->addr << 1;
 	if (((msg->data[0] >> 2) & 1) == 0)
 		/* If it's a command, put in our own sequence number. */
 		iidev->xmitmsg[4] = ((iidev->xmitmsg[4] & 0x03) |
@@ -427,12 +428,17 @@ static int ipmi_ipmb_remove(struct i2c_client *client)
 {
 	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
 
-	if (iidev->client) {
-		iidev->client = NULL;
-		i2c_slave_unregister(client);
+	if (iidev->slave) {
+		i2c_slave_unregister(iidev->slave);
+		if (iidev->slave != iidev->client)
+			i2c_unregister_device(iidev->slave);
 	}
+	iidev->slave = NULL;
+	iidev->client = NULL;
 	ipmi_ipmb_stop_thread(iidev);
 
+	ipmi_unregister_smi(iidev->intf);
+
 	return 0;
 }
 
@@ -441,6 +447,9 @@ static int ipmi_ipmb_probe(struct i2c_client *client,
 {
 	struct device *dev = &client->dev;
 	struct ipmi_ipmb_dev *iidev;
+	struct device_node *slave_np;
+	struct i2c_adapter *slave_adap = NULL;
+	struct i2c_client *slave = NULL;
 	int rv;
 
 	iidev = devm_kzalloc(&client->dev, sizeof(*iidev), GFP_KERNEL);
@@ -464,14 +473,45 @@ static int ipmi_ipmb_probe(struct i2c_client *client,
 				 &iidev->max_retries) != 0)
 		iidev->max_retries = max_retries;
 
+	slave_np = of_parse_phandle(dev->of_node, "slave-dev", 0);
+	if (slave_np) {
+		slave_adap = of_get_i2c_adapter_by_node(slave_np);
+		if (!slave_adap) {
+			dev_notice(&client->dev,
+				   "Could not find slave adapter\n");
+			return -EINVAL;
+		}
+	}
+
+	iidev->client = client;
+
+	if (slave_adap) {
+		struct i2c_board_info binfo;
+
+		memset(&binfo, 0, sizeof(binfo));
+		strscpy(binfo.type, "ipmb-slave", I2C_NAME_SIZE);
+		binfo.addr = client->addr;
+		binfo.flags = I2C_CLIENT_SLAVE;
+		slave = i2c_new_client_device(slave_adap, &binfo);
+		i2c_put_adapter(slave_adap);
+		if (IS_ERR(slave)) {
+			rv = PTR_ERR(slave);
+			dev_notice(&client->dev,
+				   "Could not allocate slave device: %d\n", rv);
+			return rv;
+		}
+		i2c_set_clientdata(slave, iidev);
+	} else {
+		slave = client;
+	}
 	i2c_set_clientdata(client, iidev);
-	client->flags |= I2C_CLIENT_SLAVE;
+	slave->flags |= I2C_CLIENT_SLAVE;
 
-	rv = i2c_slave_register(client, ipmi_ipmb_slave_cb);
+	rv = i2c_slave_register(slave, ipmi_ipmb_slave_cb);
 	if (rv)
-		return rv;
-
-	iidev->client = client;
+		goto out_err;
+	iidev->slave = slave;
+	slave = NULL;
 
 	iidev->handlers.flags = IPMI_SMI_CAN_HANDLE_IPMB_DIRECT;
 	iidev->handlers.start_processing = ipmi_ipmb_start_processing;
@@ -502,6 +542,8 @@ static int ipmi_ipmb_probe(struct i2c_client *client,
 	return 0;
 
 out_err:
+	if (slave && slave != client)
+		i2c_unregister_device(slave);
 	ipmi_ipmb_remove(client);
 	return rv;
 }
diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
index 48aab77abebf1f..f199cc19484462 100644
--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -1354,7 +1354,7 @@ static int ssif_detect(struct i2c_client *client, struct i2c_board_info *info)
 	if (rv)
 		rv = -ENODEV;
 	else
-		strlcpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
+		strscpy(info->type, DEVICE_NAME, I2C_NAME_SIZE);
 	kfree(resp);
 	return rv;
 }
@@ -1625,7 +1625,7 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	unsigned char     *resp;
 	struct ssif_info   *ssif_info;
 	int               rv = 0;
-	int               len;
+	int               len = 0;
 	int               i;
 	u8		  slave_addr = 0;
 	struct ssif_addr_info *addr_info = NULL;
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 883b4a3410122b..0604abdd249a14 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -668,7 +668,7 @@ static int ipmi_heartbeat(void)
 	return rv;
 }
 
-static struct watchdog_info ident = {
+static const struct watchdog_info ident = {
 	.options	= 0,	/* WDIOF_SETTIMEOUT, */
 	.firmware_version = 1,
 	.identity	= "IPMI"
diff --git a/drivers/char/ipmi/kcs_bmc_aspeed.c b/drivers/char/ipmi/kcs_bmc_aspeed.c
index 92a37b33494cb6..cdc88cde1e9aad 100644
--- a/drivers/char/ipmi/kcs_bmc_aspeed.c
+++ b/drivers/char/ipmi/kcs_bmc_aspeed.c
@@ -128,11 +128,6 @@ struct aspeed_kcs_bmc {
 	} obe;
 };
 
-struct aspeed_kcs_of_ops {
-	int (*get_channel)(struct platform_device *pdev);
-	int (*get_io_address)(struct platform_device *pdev, u32 addrs[2]);
-};
-
 static inline struct aspeed_kcs_bmc *to_aspeed_kcs_bmc(struct kcs_bmc_device *kcs_bmc)
 {
 	return container_of(kcs_bmc, struct aspeed_kcs_bmc, kcs_bmc);
@@ -475,38 +470,7 @@ static const struct kcs_ioreg ast_kcs_bmc_ioregs[KCS_CHANNEL_MAX] = {
 	{ .idr = LPC_IDR4, .odr = LPC_ODR4, .str = LPC_STR4 },
 };
 
-static int aspeed_kcs_of_v1_get_channel(struct platform_device *pdev)
-{
-	struct device_node *np;
-	u32 channel;
-	int rc;
-
-	np = pdev->dev.of_node;
-
-	rc = of_property_read_u32(np, "kcs_chan", &channel);
-	if ((rc != 0) || (channel == 0 || channel > KCS_CHANNEL_MAX)) {
-		dev_err(&pdev->dev, "no valid 'kcs_chan' configured\n");
-		return -EINVAL;
-	}
-
-	return channel;
-}
-
-static int
-aspeed_kcs_of_v1_get_io_address(struct platform_device *pdev, u32 addrs[2])
-{
-	int rc;
-
-	rc = of_property_read_u32(pdev->dev.of_node, "kcs_addr", addrs);
-	if (rc || addrs[0] > 0xffff) {
-		dev_err(&pdev->dev, "no valid 'kcs_addr' configured\n");
-		return -EINVAL;
-	}
-
-	return 1;
-}
-
-static int aspeed_kcs_of_v2_get_channel(struct platform_device *pdev)
+static int aspeed_kcs_of_get_channel(struct platform_device *pdev)
 {
 	struct device_node *np;
 	struct kcs_ioreg ioreg;
@@ -535,12 +499,11 @@ static int aspeed_kcs_of_v2_get_channel(struct platform_device *pdev)
 		if (!memcmp(&ast_kcs_bmc_ioregs[i], &ioreg, sizeof(ioreg)))
 			return i + 1;
 	}
-
 	return -EINVAL;
 }
 
 static int
-aspeed_kcs_of_v2_get_io_address(struct platform_device *pdev, u32 addrs[2])
+aspeed_kcs_of_get_io_address(struct platform_device *pdev, u32 addrs[2])
 {
 	int rc;
 
@@ -567,7 +530,6 @@ aspeed_kcs_of_v2_get_io_address(struct platform_device *pdev, u32 addrs[2])
 
 static int aspeed_kcs_probe(struct platform_device *pdev)
 {
-	const struct aspeed_kcs_of_ops *ops;
 	struct kcs_bmc_device *kcs_bmc;
 	struct aspeed_kcs_bmc *priv;
 	struct device_node *np;
@@ -585,15 +547,11 @@ static int aspeed_kcs_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	ops = of_device_get_match_data(&pdev->dev);
-	if (!ops)
-		return -EINVAL;
-
-	channel = ops->get_channel(pdev);
+	channel = aspeed_kcs_of_get_channel(pdev);
 	if (channel < 0)
 		return channel;
 
-	nr_addrs = ops->get_io_address(pdev, addrs);
+	nr_addrs = aspeed_kcs_of_get_io_address(pdev, addrs);
 	if (nr_addrs < 0)
 		return nr_addrs;
 
@@ -678,21 +636,10 @@ static int aspeed_kcs_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static const struct aspeed_kcs_of_ops of_v1_ops = {
-	.get_channel = aspeed_kcs_of_v1_get_channel,
-	.get_io_address = aspeed_kcs_of_v1_get_io_address,
-};
-
-static const struct aspeed_kcs_of_ops of_v2_ops = {
-	.get_channel = aspeed_kcs_of_v2_get_channel,
-	.get_io_address = aspeed_kcs_of_v2_get_io_address,
-};
-
 static const struct of_device_id ast_kcs_bmc_match[] = {
-	{ .compatible = "aspeed,ast2400-kcs-bmc", .data = &of_v1_ops },
-	{ .compatible = "aspeed,ast2500-kcs-bmc", .data = &of_v1_ops },
-	{ .compatible = "aspeed,ast2400-kcs-bmc-v2", .data = &of_v2_ops },
-	{ .compatible = "aspeed,ast2500-kcs-bmc-v2", .data = &of_v2_ops },
+	{ .compatible = "aspeed,ast2400-kcs-bmc-v2" },
+	{ .compatible = "aspeed,ast2500-kcs-bmc-v2" },
+	{ .compatible = "aspeed,ast2600-kcs-bmc" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ast_kcs_bmc_match);