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path: root/drivers/char/hw_random/timeriomem-rng.c
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Diffstat (limited to 'drivers/char/hw_random/timeriomem-rng.c')
-rw-r--r--drivers/char/hw_random/timeriomem-rng.c39
1 files changed, 35 insertions, 4 deletions
diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c
index 10ad41be589..dcd352ad0e7 100644
--- a/drivers/char/hw_random/timeriomem-rng.c
+++ b/drivers/char/hw_random/timeriomem-rng.c
@@ -90,10 +90,30 @@ static struct hwrng timeriomem_rng_ops = {
static int __init timeriomem_rng_probe(struct platform_device *pdev)
{
+ struct resource *res, *mem;
int ret;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ if (!res)
+ return -ENOENT;
+
+ mem = request_mem_region(res->start, res->end - res->start + 1,
+ pdev->name);
+ if (mem == NULL)
+ return -EBUSY;
+
+ dev_set_drvdata(&pdev->dev, mem);
+
timeriomem_rng_data = pdev->dev.platform_data;
+ timeriomem_rng_data->address = ioremap(res->start,
+ res->end - res->start + 1);
+ if (!timeriomem_rng_data->address) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
if (timeriomem_rng_data->period != 0
&& usecs_to_jiffies(timeriomem_rng_data->period) > 0) {
timeriomem_rng_timer.expires = jiffies;
@@ -104,23 +124,34 @@ static int __init timeriomem_rng_probe(struct platform_device *pdev)
timeriomem_rng_data->present = 1;
ret = hwrng_register(&timeriomem_rng_ops);
- if (ret) {
- dev_err(&pdev->dev, "problem registering\n");
- return ret;
- }
+ if (ret)
+ goto err_register;
dev_info(&pdev->dev, "32bits from 0x%p @ %dus\n",
timeriomem_rng_data->address,
timeriomem_rng_data->period);
return 0;
+
+err_register:
+ dev_err(&pdev->dev, "problem registering\n");
+ iounmap(timeriomem_rng_data->address);
+err_ioremap:
+ release_resource(mem);
+
+ return ret;
}
static int __devexit timeriomem_rng_remove(struct platform_device *pdev)
{
+ struct resource *mem = dev_get_drvdata(&pdev->dev);
+
del_timer_sync(&timeriomem_rng_timer);
hwrng_unregister(&timeriomem_rng_ops);
+ iounmap(timeriomem_rng_data->address);
+ release_resource(mem);
+
return 0;
}