debugfs: Add debugfs_create_ulong()

[firefly-linux-kernel-4.4.55.git] / fs / debugfs / file.c

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index f69d42efe4b8bd8c414370e1c3c39d81adc511b4..d2ba12e23ed94d78b35e0f01977be8433e80fca4 100644 (file)
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -243,6 +243,54 @@ struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 }
 EXPORT_SYMBOL_GPL(debugfs_create_u64);
 
+static int debugfs_ulong_set(void *data, u64 val)
+{
+       *(unsigned long *)data = val;
+       return 0;
+}
+
+static int debugfs_ulong_get(void *data, u64 *val)
+{
+       *val = *(unsigned long *)data;
+       return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(fops_ulong, debugfs_ulong_get, debugfs_ulong_set, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_ulong_ro, debugfs_ulong_get, NULL, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n");
+
+/**
+ * debugfs_create_ulong - create a debugfs file that is used to read and write
+ * an unsigned long value.
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this parameter is %NULL, then the
+ *          file will be created in the root of the debugfs filesystem.
+ * @value: a pointer to the variable that the file should read to and write
+ *         from.
+ *
+ * This function creates a file in debugfs with the given name that
+ * contains the value of the variable @value.  If the @mode variable is so
+ * set, it can be read from, and written to.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the debugfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, %NULL will be returned.
+ *
+ * If debugfs is not enabled in the kernel, the value -%ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *debugfs_create_ulong(const char *name, umode_t mode,
+                                   struct dentry *parent, unsigned long *value)
+{
+       return debugfs_create_mode(name, mode, parent, value, &fops_ulong,
+                                  &fops_ulong_ro, &fops_ulong_wo);
+}
+EXPORT_SYMBOL_GPL(debugfs_create_ulong);
+
 DEFINE_SIMPLE_ATTRIBUTE(fops_x8, debugfs_u8_get, debugfs_u8_set, "0x%02llx\n");
 DEFINE_SIMPLE_ATTRIBUTE(fops_x8_ro, debugfs_u8_get, NULL, "0x%02llx\n");
 DEFINE_SIMPLE_ATTRIBUTE(fops_x8_wo, NULL, debugfs_u8_set, "0x%02llx\n");
@@ -352,6 +400,8 @@ static int debugfs_size_t_get(void *data, u64 *val)
 }
 DEFINE_SIMPLE_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set,
                        "%llu\n");      /* %llu and %zu are more or less the same */
+DEFINE_SIMPLE_ATTRIBUTE(fops_size_t_ro, debugfs_size_t_get, NULL, "%llu\n");
+DEFINE_SIMPLE_ATTRIBUTE(fops_size_t_wo, NULL, debugfs_size_t_set, "%llu\n");
 
 /**
  * debugfs_create_size_t - create a debugfs file that is used to read and write an size_t value
@@ -366,7 +416,8 @@ DEFINE_SIMPLE_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set,
 struct dentry *debugfs_create_size_t(const char *name, umode_t mode,
                                     struct dentry *parent, size_t *value)
 {
-       return debugfs_create_file(name, mode, parent, value, &fops_size_t);
+       return debugfs_create_mode(name, mode, parent, value, &fops_size_t,
+                                  &fops_size_t_ro, &fops_size_t_wo);
 }
 EXPORT_SYMBOL_GPL(debugfs_create_size_t);
 
@@ -447,6 +498,18 @@ static const struct file_operations fops_bool = {
        .llseek =       default_llseek,
 };
 
+static const struct file_operations fops_bool_ro = {
+       .read =         debugfs_read_file_bool,
+       .open =         simple_open,
+       .llseek =       default_llseek,
+};
+
+static const struct file_operations fops_bool_wo = {
+       .write =        debugfs_write_file_bool,
+       .open =         simple_open,
+       .llseek =       default_llseek,
+};
+
 /**
  * debugfs_create_bool - create a debugfs file that is used to read and write a boolean value
  * @name: a pointer to a string containing the name of the file to create.
@@ -474,7 +537,8 @@ static const struct file_operations fops_bool = {
 struct dentry *debugfs_create_bool(const char *name, umode_t mode,
                                   struct dentry *parent, bool *value)
 {
-       return debugfs_create_file(name, mode, parent, value, &fops_bool);
+       return debugfs_create_mode(name, mode, parent, value, &fops_bool,
+                                  &fops_bool_ro, &fops_bool_wo);
 }
 EXPORT_SYMBOL_GPL(debugfs_create_bool);