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path: root/drivers/macintosh/ans-lcd.c
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Diffstat (limited to 'drivers/macintosh/ans-lcd.c')
-rw-r--r--drivers/macintosh/ans-lcd.c45
1 files changed, 28 insertions, 17 deletions
diff --git a/drivers/macintosh/ans-lcd.c b/drivers/macintosh/ans-lcd.c
index 6a8221893256..a3d25da2f275 100644
--- a/drivers/macintosh/ans-lcd.c
+++ b/drivers/macintosh/ans-lcd.c
@@ -3,7 +3,6 @@
*/
#include <linux/types.h>
-#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
@@ -26,6 +25,7 @@
static unsigned long anslcd_short_delay = 80;
static unsigned long anslcd_long_delay = 3280;
static volatile unsigned char __iomem *anslcd_ptr;
+static DEFINE_MUTEX(anslcd_mutex);
#undef DEBUG
@@ -65,26 +65,31 @@ anslcd_write( struct file * file, const char __user * buf,
if (!access_ok(VERIFY_READ, buf, count))
return -EFAULT;
+
+ mutex_lock(&anslcd_mutex);
for ( i = *ppos; count > 0; ++i, ++p, --count )
{
char c;
__get_user(c, p);
anslcd_write_byte_data( c );
}
+ mutex_unlock(&anslcd_mutex);
*ppos = i;
return p - buf;
}
-static int
-anslcd_ioctl( struct inode * inode, struct file * file,
- unsigned int cmd, unsigned long arg )
+static long
+anslcd_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
char ch, __user *temp;
+ long ret = 0;
#ifdef DEBUG
printk(KERN_DEBUG "LCD: ioctl(%d,%d)\n",cmd,arg);
#endif
+ mutex_lock(&anslcd_mutex);
+
switch ( cmd )
{
case ANSLCD_CLEAR:
@@ -93,7 +98,7 @@ anslcd_ioctl( struct inode * inode, struct file * file,
anslcd_write_byte_ctrl ( 0x06 );
anslcd_write_byte_ctrl ( 0x01 );
anslcd_write_byte_ctrl ( 0x02 );
- return 0;
+ break;
case ANSLCD_SENDCTRL:
temp = (char __user *) arg;
__get_user(ch, temp);
@@ -101,33 +106,37 @@ anslcd_ioctl( struct inode * inode, struct file * file,
anslcd_write_byte_ctrl ( ch );
__get_user(ch, temp);
}
- return 0;
+ break;
case ANSLCD_SETSHORTDELAY:
if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- anslcd_short_delay=arg;
- return 0;
+ ret =-EACCES;
+ else
+ anslcd_short_delay=arg;
+ break;
case ANSLCD_SETLONGDELAY:
if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- anslcd_long_delay=arg;
- return 0;
+ ret = -EACCES;
+ else
+ anslcd_long_delay=arg;
+ break;
default:
- return -EINVAL;
+ ret = -EINVAL;
}
+
+ mutex_unlock(&anslcd_mutex);
+ return ret;
}
static int
anslcd_open( struct inode * inode, struct file * file )
{
- cycle_kernel_lock();
return 0;
}
const struct file_operations anslcd_fops = {
- .write = anslcd_write,
- .ioctl = anslcd_ioctl,
- .open = anslcd_open,
+ .write = anslcd_write,
+ .unlocked_ioctl = anslcd_ioctl,
+ .open = anslcd_open,
};
static struct miscdevice anslcd_dev = {
@@ -168,6 +177,7 @@ anslcd_init(void)
printk(KERN_DEBUG "LCD: init\n");
#endif
+ mutex_lock(&anslcd_mutex);
anslcd_write_byte_ctrl ( 0x38 );
anslcd_write_byte_ctrl ( 0x0c );
anslcd_write_byte_ctrl ( 0x06 );
@@ -176,6 +186,7 @@ anslcd_init(void)
for(a=0;a<80;a++) {
anslcd_write_byte_data(anslcd_logo[a]);
}
+ mutex_unlock(&anslcd_mutex);
return 0;
}