doc: random number generation

Add random number generation APIs to the HTML documentation.
Fix style issues.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

diff --git a/MAINTAINERS b/MAINTAINERS
index 1fd975c..00985c0 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -877,6 +877,7 @@ M:  Sughosh Ganu <sughosh.ganu@linaro.org>
 R:     Heinrich Schuchardt <xypron.glpk@gmx.de>
 S:     Maintained
 F:     cmd/rng.c
+F:     doc/api/rng.rst
 F:     drivers/rng/
 F:     drivers/virtio/virtio_rng.c
 F:     include/rng.h

diff --git a/doc/api/index.rst b/doc/api/index.rst
index fd3b5bd..b7eb572 100644 (file)
--- a/doc/api/index.rst
+++ b/doc/api/index.rst
@@ -9,5 +9,6 @@ U-Boot API documentation
    dfu
    efi
    linker_lists
+   rng
    serial
    unicode

diff --git a/doc/api/rng.rst b/doc/api/rng.rst
new file mode 100644 (file)
index 0000000..b826d4f
--- /dev/null
+++ b/doc/api/rng.rst
@@ -0,0 +1,17 @@
+.. SPDX-License-Identifier: GPL-2.0+
+.. Copyright (c) 2018 Heinrich Schuchardt
+
+Random number generation
+========================
+
+Hardware random number generation
+---------------------------------
+
+.. kernel-doc:: include/rng.h
+   :internal:
+
+Pseudo random number generation
+-------------------------------
+
+.. kernel-doc:: include/rand.h
+   :internal:

diff --git a/include/rand.h b/include/rand.h
index c9d15f5..4c54fbb 100644 (file)
--- a/include/rand.h
+++ b/include/rand.h
@@ -22,7 +22,7 @@ void srand(unsigned int seed);
 /**
  * rand() - Get a 32-bit pseudo-random number
  *
- * @returns next random number in the sequence
+ * Return:     next random number in the sequence
  */
 unsigned int rand(void);
 
@@ -32,8 +32,8 @@ unsigned int rand(void);
  * This version of the function allows multiple sequences to be used at the
  * same time, since it requires the caller to store the seed value.
  *
- * @seed value to use, updated on exit
- * @returns next random number in the sequence
+ * @seedp:     seed value to use, updated on exit
+ * Return:      next random number in the sequence
  */
 unsigned int rand_r(unsigned int *seedp);
 

diff --git a/include/rng.h b/include/rng.h
index d2c0f9a..37af554 100644 (file)
--- a/include/rng.h
+++ b/include/rng.h
@@ -10,22 +10,32 @@ struct udevice;
 
 /**
  * dm_rng_read() - read a random number seed from the rng device
- * @buffer:    input buffer to put the read random seed into
- * @size:      number of bytes of random seed read
  *
- * Return: 0 if OK, -ve on error
+ * The function blocks until the requested number of bytes is read.
+ *
+ * @dev:       random number generator device
+ * @buffer:    input buffer to put the read random seed into
+ * @size:      number of random bytes to read
+ * Return:     0 if OK, -ve on error
  */
 int dm_rng_read(struct udevice *dev, void *buffer, size_t size);
 
-/* struct dm_rng_ops - Operations for the hwrng uclass */
+/**
+ * struct dm_rng_ops - operations for the hwrng uclass
+ *
+ * This structures contains the function implemented by a hardware random
+ * number generation device.
+ */
 struct dm_rng_ops {
        /**
-        * @read() - read a random number seed
+        * @read:       read a random bytes
         *
-        * @data:       input buffer to read the random seed
-        * @max:        total number of bytes to read
+        * The function blocks until the requested number of bytes is read.
         *
-        * Return: 0 if OK, -ve on error
+        * @read.dev:           random number generator device
+        * @read.data:          input buffer to read the random seed into
+        * @read.max:           number of random bytes to read
+        * @read.Return:        0 if OK, -ve on error
         */
        int (*read)(struct udevice *dev, void *data, size_t max);
 };