2012-02-22 14:20:51

by Dimitris Papastamos

Subject: [PATCH] regmap: Expose the driver name in debugfs

The `name' file should contain the name of the device
driver.

Signed-off-by: Dimitris Papastamos <[email protected]>
---
drivers/base/regmap/regmap-debugfs.c | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index b3b4b8f..a5a96a5 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)
{
@@ -186,6 +215,9 @@ 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);
--
1.7.9.1