regmap: Expose the driver name in debugfs

Add a file called 'name' containing the name of the driver.

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 7accb81dd94e..c32b60a93ceb 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -33,6 +33,35 @@ static int regmap_open_file(struct inode *inode, struct file *file)
         return 0;
 }
 
+static ssize_t regmap_name_read_file(struct file *file,
+                                     char __user *user_buf, size_t count,
+                                     loff_t *ppos)
+{
+        struct regmap *map = file->private_data;
+        int ret;
+        char *buf;
+
+        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+        if (!buf)
+                return -ENOMEM;
+
+        ret = snprintf(buf, PAGE_SIZE, "%s\n", map->dev->driver->name);
+        if (ret < 0) {
+                kfree(buf);
+                return ret;
+        }
+
+        ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+        kfree(buf);
+        return ret;
+}
+
+static const struct file_operations regmap_name_fops = {
+        .open = regmap_open_file,
+        .read = regmap_name_read_file,
+        .llseek = default_llseek,
+};
+
 static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
                                     size_t count, loff_t *ppos)
 {
@@ -228,6 +257,9 @@ void regmap_debugfs_init(struct regmap *map)
                 return;
         }
 
+        debugfs_create_file("name", 0400, map->debugfs,
+                            map, &regmap_name_fops);
+
         if (map->max_register) {
                 debugfs_create_file("registers", 0400, map->debugfs,
                                     map, &regmap_map_fops);