diff options
Diffstat (limited to 'kernel/dma.c')
| -rw-r--r-- | kernel/dma.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/kernel/dma.c b/kernel/dma.c index aef0a45b789..6c6262f86c1 100644 --- a/kernel/dma.c +++ b/kernel/dma.c @@ -1,4 +1,4 @@ -/* $Id: dma.c,v 1.7 1994/12/28 03:35:33 root Exp root $ +/* * linux/kernel/dma.c: A DMA channel allocator. Inspired by linux/kernel/irq.c. * * Written by Hennus Bergman, 1992. @@ -9,7 +9,7 @@ * [It also happened to remove the sizeof(char *) == sizeof(int) * assumption introduced because of those /proc/dma patches. -- Hennus] */ -#include <linux/module.h> +#include <linux/export.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/spinlock.h> @@ -18,9 +18,8 @@ #include <linux/proc_fs.h> #include <linux/init.h> #include <asm/dma.h> -#include <asm/system.h> - + /* A note on resource allocation: * @@ -62,6 +61,11 @@ static struct dma_chan dma_chan_busy[MAX_DMA_CHANNELS] = { }; +/** + * request_dma - request and reserve a system DMA channel + * @dmanr: DMA channel number + * @device_id: reserving device ID string, used in /proc/dma + */ int request_dma(unsigned int dmanr, const char * device_id) { if (dmanr >= MAX_DMA_CHANNELS) @@ -76,7 +80,10 @@ int request_dma(unsigned int dmanr, const char * device_id) return 0; } /* request_dma */ - +/** + * free_dma - free a reserved system DMA channel + * @dmanr: DMA channel number + */ void free_dma(unsigned int dmanr) { if (dmanr >= MAX_DMA_CHANNELS) { @@ -87,7 +94,7 @@ void free_dma(unsigned int dmanr) if (xchg(&dma_chan_busy[dmanr].lock, 0) == 0) { printk(KERN_WARNING "Trying to free free DMA%d\n", dmanr); return; - } + } } /* free_dma */ @@ -113,8 +120,8 @@ static int proc_dma_show(struct seq_file *m, void *v) for (i = 0 ; i < MAX_DMA_CHANNELS ; i++) { if (dma_chan_busy[i].lock) { - seq_printf(m, "%2d: %s\n", i, - dma_chan_busy[i].device_id); + seq_printf(m, "%2d: %s\n", i, + dma_chan_busy[i].device_id); } } return 0; @@ -132,7 +139,7 @@ static int proc_dma_open(struct inode *inode, struct file *file) return single_open(file, proc_dma_show, NULL); } -static struct file_operations proc_dma_operations = { +static const struct file_operations proc_dma_operations = { .open = proc_dma_open, .read = seq_read, .llseek = seq_lseek, @@ -141,12 +148,7 @@ static struct file_operations proc_dma_operations = { static int __init proc_dma_init(void) { - struct proc_dir_entry *e; - - e = create_proc_entry("dma", 0, NULL); - if (e) - e->proc_fops = &proc_dma_operations; - + proc_create("dma", 0, NULL, &proc_dma_operations); return 0; } |