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authorRussell King <rmk+kernel@arm.linux.org.uk>2009-12-24 18:32:13 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-04-14 13:13:30 +0100
commite193ba290f0228453341b41ab2bbdd963259f97e (patch)
treecb8847c8a0d19b60b350e94f90ed49e42eea1af1 /arch/arm/kernel/dma.c
parentf76348a360fe92063e07a8f54b0c1ea67f91e76c (diff)
ARM: dma: add /proc/dma support to arch/arm/kernel/dma.c
We have our own private implementation for ISA-like DMA which has been missing exposure via the /proc/dma interface. Add support for this. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/dma.c')
-rw-r--r--arch/arm/kernel/dma.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/arm/kernel/dma.c b/arch/arm/kernel/dma.c
index 7d5b9fb01e7..2c4a185f92c 100644
--- a/arch/arm/kernel/dma.c
+++ b/arch/arm/kernel/dma.c
@@ -16,6 +16,8 @@
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/scatterlist.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
#include <asm/dma.h>
@@ -264,3 +266,37 @@ int get_dma_residue(unsigned int chan)
return ret;
}
EXPORT_SYMBOL(get_dma_residue);
+
+#ifdef CONFIG_PROC_FS
+static int proc_dma_show(struct seq_file *m, void *v)
+{
+ int i;
+
+ for (i = 0 ; i < MAX_DMA_CHANNELS ; i++) {
+ dma_t *dma = dma_channel(i);
+ if (dma && dma->lock)
+ seq_printf(m, "%2d: %s\n", i, dma->device_id);
+ }
+ return 0;
+}
+
+static int proc_dma_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_dma_show, NULL);
+}
+
+static const struct file_operations proc_dma_operations = {
+ .open = proc_dma_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init proc_dma_init(void)
+{
+ proc_create("dma", 0, NULL, &proc_dma_operations);
+ return 0;
+}
+
+__initcall(proc_dma_init);
+#endif