hwmon: (pmbus/core) Optimize debugfs block data attribute initialization

Define debugfs attributes which need block data access in a data
structure and loop through it instead of creating debugfs files
one by one. This reduces code size and simplifies adding additional
attributes if needed.

While this is currently only used for manufacturer specific attributes,
the access code is generic and also works for other block attributes,
so rename operation functions from _mfg to _block.

While at it, rename the "revison" file to "pmbus_revision" to make its
meaning more obvious and to create a clear distinction against the
"mfg_revision" file.

Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Author: groeck

drivers/hwmon/pmbus/pmbus_core.c

@@ -3460,8 +3460,8 @@ static int pmbus_debugfs_get_status(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
 			 NULL, "0x%04llx\n");
 
-static ssize_t pmbus_debugfs_mfr_read(struct file *file, char __user *buf,
-				      size_t count, loff_t *ppos)
+static ssize_t pmbus_debugfs_block_read(struct file *file, char __user *buf,
+					size_t count, loff_t *ppos)
 {
 	int rc;
 	struct pmbus_debugfs_entry *entry = file->private_data;
@@ -3486,9 +3486,9 @@ static ssize_t pmbus_debugfs_mfr_read(struct file *file, char __user *buf,
 	return simple_read_from_buffer(buf, count, ppos, data, rc);
 }
 
-static const struct file_operations pmbus_debugfs_ops_mfr = {
+static const struct file_operations pmbus_debugfs_block_ops = {
 	.llseek = noop_llseek,
-	.read = pmbus_debugfs_mfr_read,
+	.read = pmbus_debugfs_block_read,
 	.write = NULL,
 	.open = simple_open,
 };
@@ -3498,6 +3498,20 @@ static void pmbus_remove_symlink(void *symlink)
 	debugfs_remove(symlink);
 }
 
+struct pmbus_debugfs_data {
+	u8 reg;
+	const char *name;
+};
+
+static const struct pmbus_debugfs_data pmbus_debugfs_block_data[] = {
+	{ .reg = PMBUS_MFR_ID, .name = "mfr_id" },
+	{ .reg = PMBUS_MFR_MODEL, .name = "mfr_model" },
+	{ .reg = PMBUS_MFR_REVISION, .name = "mfr_revision" },
+	{ .reg = PMBUS_MFR_LOCATION, .name = "mfr_location" },
+	{ .reg = PMBUS_MFR_DATE, .name = "mfr_date" },
+	{ .reg = PMBUS_MFR_SERIAL, .name = "mfr_serial" },
+};
+
 static void pmbus_init_debugfs(struct i2c_client *client,
 			       struct pmbus_data *data)
 {
@@ -3539,12 +3553,14 @@ static void pmbus_init_debugfs(struct i2c_client *client,
 
 	/*
 	 * Allocate the max possible entries we need.
-	 * 7 entries device-specific
+	 * device specific:
+	 *	ARRAY_SIZE(pmbus_debugfs_block_data) + 1
 	 * 10 entries page-specific
 	 */
 	entries = devm_kcalloc(data->dev,
-			       7 + data->info->pages * 10, sizeof(*entries),
-			       GFP_KERNEL);
+			       ARRAY_SIZE(pmbus_debugfs_block_data) + 1 +
+			       data->info->pages * 10,
+			       sizeof(*entries), GFP_KERNEL);
 	if (!entries)
 		return;
 
@@ -3560,63 +3576,22 @@ static void pmbus_init_debugfs(struct i2c_client *client,
 		entries[idx].client = client;
 		entries[idx].page = 0;
 		entries[idx].reg = PMBUS_REVISION;
-		debugfs_create_file("revision", 0444, debugfs,
+		debugfs_create_file("pmbus_revision", 0444, debugfs,
 				    &entries[idx++],
 				    &pmbus_debugfs_ops);
 	}
 
-	if (pmbus_check_block_register(client, 0, PMBUS_MFR_ID)) {
-		entries[idx].client = client;
-		entries[idx].page = 0;
-		entries[idx].reg = PMBUS_MFR_ID;
-		debugfs_create_file("mfr_id", 0444, debugfs,
-				    &entries[idx++],
-				    &pmbus_debugfs_ops_mfr);
-	}
-
-	if (pmbus_check_block_register(client, 0, PMBUS_MFR_MODEL)) {
-		entries[idx].client = client;
-		entries[idx].page = 0;
-		entries[idx].reg = PMBUS_MFR_MODEL;
-		debugfs_create_file("mfr_model", 0444, debugfs,
-				    &entries[idx++],
-				    &pmbus_debugfs_ops_mfr);
-	}
+	for (i = 0; i < ARRAY_SIZE(pmbus_debugfs_block_data); i++) {
+		const struct pmbus_debugfs_data *d = &pmbus_debugfs_block_data[i];
 
-	if (pmbus_check_block_register(client, 0, PMBUS_MFR_REVISION)) {
-		entries[idx].client = client;
-		entries[idx].page = 0;
-		entries[idx].reg = PMBUS_MFR_REVISION;
-		debugfs_create_file("mfr_revision", 0444, debugfs,
-				    &entries[idx++],
-				    &pmbus_debugfs_ops_mfr);
-	}
-
-	if (pmbus_check_block_register(client, 0, PMBUS_MFR_LOCATION)) {
-		entries[idx].client = client;
-		entries[idx].page = 0;
-		entries[idx].reg = PMBUS_MFR_LOCATION;
-		debugfs_create_file("mfr_location", 0444, debugfs,
-				    &entries[idx++],
-				    &pmbus_debugfs_ops_mfr);
-	}
-
-	if (pmbus_check_block_register(client, 0, PMBUS_MFR_DATE)) {
-		entries[idx].client = client;
-		entries[idx].page = 0;
-		entries[idx].reg = PMBUS_MFR_DATE;
-		debugfs_create_file("mfr_date", 0444, debugfs,
-				    &entries[idx++],
-				    &pmbus_debugfs_ops_mfr);
-	}
-
-	if (pmbus_check_block_register(client, 0, PMBUS_MFR_SERIAL)) {
-		entries[idx].client = client;
-		entries[idx].page = 0;
-		entries[idx].reg = PMBUS_MFR_SERIAL;
-		debugfs_create_file("mfr_serial", 0444, debugfs,
-				    &entries[idx++],
-				    &pmbus_debugfs_ops_mfr);
+		if (pmbus_check_block_register(client, 0, d->reg)) {
+			entries[idx].client = client;
+			entries[idx].page = 0;
+			entries[idx].reg = d->reg;
+			debugfs_create_file(d->name, 0444, debugfs,
+					    &entries[idx++],
+					    &pmbus_debugfs_block_ops);
+		}
 	}
 
 	/* Add page specific entries */