[POWERPC] Sky Cpu and Nexus: use seq_file/single_open on proc interface

This patch changes proc interface to be used with single_file/seq_open
calls.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 35 insertions, 31 deletions

diff --git a/drivers/misc/hdpuftrs/hdpu_cpustate.c b/drivers/misc/hdpuftrs/hdpu_cpustate.c
index 32f65a3e07ce..aa8ce7abe922 100644
--- a/drivers/misc/hdpuftrs/hdpu_cpustate.c
+++ b/drivers/misc/hdpuftrs/hdpu_cpustate.c
@@ -19,9 +19,10 @@
 #include <linux/spinlock.h>
 #include <linux/miscdevice.h>
 #include <linux/proc_fs.h>
+#include <linux/hdpu_features.h>
 #include <linux/platform_device.h>
 #include <asm/uaccess.h>
-#include <linux/hdpu_features.h>
+#include <linux/seq_file.h>
 #include <asm/io.h>
 
 #define SKY_CPUSTATE_VERSION            "1.1"
@@ -29,7 +30,30 @@
 static int hdpu_cpustate_probe(struct platform_device *pdev);
 static int hdpu_cpustate_remove(struct platform_device *pdev);
 
-struct cpustate_t cpustate;
+static unsigned char cpustate_get_state(void);
+static int cpustate_proc_open(struct inode *inode, struct file *file);
+static int cpustate_proc_read(struct seq_file *seq, void *offset);
+
+static struct cpustate_t cpustate;
+
+static const struct file_operations proc_cpustate = {
+        .open = cpustate_proc_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+        .owner = THIS_MODULE,
+};
+
+static int cpustate_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, cpustate_proc_read, NULL);
+}
+
+static int cpustate_proc_read(struct seq_file *seq, void *offset)
+{
+        seq_printf(seq, "CPU State: %04x\n", cpustate_get_state());
+        return 0;
+}
 
 static int cpustate_get_ref(int excl)
 {
@@ -67,13 +91,13 @@ static int cpustate_free_ref(void)
         return 0;
 }
 
-unsigned char cpustate_get_state(void)
+static unsigned char cpustate_get_state(void)
 {
 
         return cpustate.cached_val;
 }
 
-void cpustate_set_state(unsigned char new_state)
+static void cpustate_set_state(unsigned char new_state)
 {
         unsigned int state = (new_state << 21);
 
@@ -135,29 +159,6 @@ static int cpustate_release(struct inode *inode, struct file *file)
         return cpustate_free_ref();
 }
 
-/*
- *      Info exported via "/proc/sky_cpustate".
- */
-static int cpustate_read_proc(char *page, char **start, off_t off,
-                              int count, int *eof, void *data)
-{
-        char *p = page;
-        int len = 0;
-
-        p += sprintf(p, "CPU State: %04x\n", cpustate_get_state());
-        len = p - page;
-
-        if (len <= off + count)
-                *eof = 1;
-        *start = page + off;
-        len -= off;
-        if (len > count)
-                len = count;
-        if (len < 0)
-                len = 0;
-        return len;
-}
-
 static struct platform_driver hdpu_cpustate_driver = {
         .probe = hdpu_cpustate_probe,
         .remove = hdpu_cpustate_remove,
@@ -208,11 +209,14 @@ static int hdpu_cpustate_probe(struct platform_device *pdev)
                 return ret;
         }
 
-        proc_de = create_proc_read_entry("sky_cpustate", 0, 0,
-                                         cpustate_read_proc, NULL);
-        if (proc_de == NULL)
+        proc_de = create_proc_entry("sky_cpustate", 0666, &proc_root);
+        if (!proc_de) {
                 printk(KERN_WARNING "sky_cpustate: "
-                       "Unable to create proc dir entry\n");
+                       "Unable to create proc entry\n");
+        } else {
+                proc_de->proc_fops = &proc_cpustate;
+                proc_de->owner = THIS_MODULE;
+        }
 
         printk(KERN_INFO "Sky CPU State Driver v" SKY_CPUSTATE_VERSION "\n");
         return 0;