proc: switch /proc/apm to seq_file interface

Signed-off-by: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 5 deletions

diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index 17d54315e146..cdd876dbb2b0 100644
--- a/drivers/char/apm-emulation.c
+++ b/drivers/char/apm-emulation.c
@@ -14,6 +14,7 @@
 #include <linux/poll.h>
 #include <linux/slab.h>
 #include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/miscdevice.h>
 #include <linux/apm_bios.h>
 #include <linux/capability.h>
@@ -493,11 +494,10 @@ static struct miscdevice apm_device = {
  *      -1: Unknown
  *   8) min = minutes; sec = seconds
  */
-static int apm_get_info(char *buf, char **start, off_t fpos, int length)
+static int proc_apm_show(struct seq_file *m, void *v)
 {
         struct apm_power_info info;
         char *units;
-        int ret;
 
         info.ac_line_status = 0xff;
         info.battery_status = 0xff;
@@ -515,14 +515,27 @@ static int apm_get_info(char *buf, char **start, off_t fpos, int length)
         case 1:         units = "sec";  break;
         }
 
-        ret = sprintf(buf, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
+        seq_printf(m, "%s 1.2 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n",
                      driver_version, APM_32_BIT_SUPPORT,
                      info.ac_line_status, info.battery_status,
                      info.battery_flag, info.battery_life,
                      info.time, units);
 
-        return ret;
+        return 0;
 }
+
+static int proc_apm_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, proc_apm_show, NULL);
+}
+
+static const struct file_operations apm_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = proc_apm_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
 #endif
 
 static int kapmd(void *arg)
@@ -593,7 +606,7 @@ static int __init apm_init(void)
         wake_up_process(kapmd_tsk);
 
 #ifdef CONFIG_PROC_FS
-        create_proc_info_entry("apm", 0, NULL, apm_get_info);
+        proc_create("apm", 0, NULL, &apm_proc_fops);
 #endif
 
         ret = misc_register(&apm_device);