Commit 3da77549 authored by Mark Brown's avatar Mark Brown Committed by Ben Hutchings

mfd: wm831x: Feed the device UUID into device_add_randomness()

commit 27130f0c upstream.

wm831x devices contain a unique ID value. Feed this into the newly added
device_add_randomness() to add some per device seed data to the pool.
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent 648deda0
...@@ -18,6 +18,7 @@ ...@@ -18,6 +18,7 @@
#include <linux/bcd.h> #include <linux/bcd.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/mfd/core.h> #include <linux/mfd/core.h>
#include <linux/random.h>
#include <linux/mfd/wm831x/core.h> #include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/otp.h> #include <linux/mfd/wm831x/otp.h>
...@@ -66,6 +67,7 @@ static DEVICE_ATTR(unique_id, 0444, wm831x_unique_id_show, NULL); ...@@ -66,6 +67,7 @@ static DEVICE_ATTR(unique_id, 0444, wm831x_unique_id_show, NULL);
int wm831x_otp_init(struct wm831x *wm831x) int wm831x_otp_init(struct wm831x *wm831x)
{ {
char uuid[WM831X_UNIQUE_ID_LEN];
int ret; int ret;
ret = device_create_file(wm831x->dev, &dev_attr_unique_id); ret = device_create_file(wm831x->dev, &dev_attr_unique_id);
...@@ -73,6 +75,12 @@ int wm831x_otp_init(struct wm831x *wm831x) ...@@ -73,6 +75,12 @@ int wm831x_otp_init(struct wm831x *wm831x)
dev_err(wm831x->dev, "Unique ID attribute not created: %d\n", dev_err(wm831x->dev, "Unique ID attribute not created: %d\n",
ret); ret);
ret = wm831x_unique_id_read(wm831x, uuid);
if (ret == 0)
add_device_randomness(uuid, sizeof(uuid));
else
dev_err(wm831x->dev, "Failed to read UUID: %d\n", ret);
return ret; return ret;
} }
......
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