[PATCH] hwmon: (pmbus/acbel-fsg032) Add firmware version debugfs attribute

[Eddie James <eajames@linux.ibm.com>]

Like the IBM CFFPS driver, export the PSU's firmware version to a
debugfs attribute as reported in the manufacturer register.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
 drivers/hwmon/pmbus/acbel-fsg032.c | 48 ++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/hwmon/pmbus/acbel-fsg032.c b/drivers/hwmon/pmbus/acbel-fsg032.c
index 0a0ef4ce3493..4b97f108cfe3 100644
--- a/drivers/hwmon/pmbus/acbel-fsg032.c
+++ b/drivers/hwmon/pmbus/acbel-fsg032.c
@@ -3,6 +3,7 @@
  * Copyright 2023 IBM Corp.
  */
 
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/fs.h>
 #include <linux/i2c.h>
@@ -11,6 +12,52 @@
 #include <linux/hwmon-sysfs.h>
 #include "pmbus.h"
 
+#define ACBEL_MFR_FW_REVISION	0xd9
+
+static ssize_t acbel_fsg032_debugfs_read(struct file *file, char __user *buf, size_t count,
+					 loff_t *ppos)
+{
+	struct i2c_client *client = file->private_data;
+	char data[I2C_SMBUS_BLOCK_MAX + 2] = { 0 };
+	char out[8];
+	int rc;
+	int i;
+
+	rc = pmbus_lock_interruptible(client);
+	if (rc)
+		return rc;
+
+	rc = i2c_smbus_read_block_data(client, ACBEL_MFR_FW_REVISION, data);
+	pmbus_unlock(client);
+	if (rc < 0)
+		return rc;
+
+	for (i = 0; i < rc && i < 3; ++i)
+		snprintf(&out[i * 2], 3, "%02X", data[i]);
+
+	rc = i * 2;
+	out[rc++] = '\n';
+	out[rc++] = 0;
+	return simple_read_from_buffer(buf, count, ppos, out, rc);
+}
+
+static const struct file_operations acbel_debugfs_ops = {
+	.llseek = noop_llseek,
+	.read = acbel_fsg032_debugfs_read,
+	.write = NULL,
+	.open = simple_open,
+};
+
+static void acbel_fsg032_init_debugfs(struct i2c_client *client)
+{
+	struct dentry *debugfs = pmbus_get_debugfs_dir(client);
+
+	if (!debugfs)
+		return;
+
+	debugfs_create_file("fw_version", 0444, debugfs, client, &acbel_debugfs_ops);
+}
+
 static const struct i2c_device_id acbel_fsg032_id[] = {
 	{ "acbel_fsg032" },
 	{}
@@ -59,6 +106,7 @@ static int acbel_fsg032_probe(struct i2c_client *client)
 	if (rc)
 		return rc;
 
+	acbel_fsg032_init_debugfs(client);
 	return 0;
 }
 
-- 
2.39.3