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path: root/drivers/hwmon/vt1211.c
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Diffstat (limited to 'drivers/hwmon/vt1211.c')
-rw-r--r--drivers/hwmon/vt1211.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/hwmon/vt1211.c b/drivers/hwmon/vt1211.c
index 3a6bfa51cb94..95d5e8ec8b7f 100644
--- a/drivers/hwmon/vt1211.c
+++ b/drivers/hwmon/vt1211.c
@@ -226,15 +226,21 @@ static inline void superio_select(int sio_cip, int ldn)
outb(ldn, sio_cip + 1);
}
-static inline void superio_enter(int sio_cip)
+static inline int superio_enter(int sio_cip)
{
+ if (!request_muxed_region(sio_cip, 2, DRVNAME))
+ return -EBUSY;
+
outb(0x87, sio_cip);
outb(0x87, sio_cip);
+
+ return 0;
}
static inline void superio_exit(int sio_cip)
{
outb(0xaa, sio_cip);
+ release_region(sio_cip, 2);
}
/* ---------------------------------------------------------------------
@@ -1282,11 +1288,14 @@ EXIT:
static int __init vt1211_find(int sio_cip, unsigned short *address)
{
- int err = -ENODEV;
+ int err;
int devid;
- superio_enter(sio_cip);
+ err = superio_enter(sio_cip);
+ if (err)
+ return err;
+ err = -ENODEV;
devid = force_id ? force_id : superio_inb(sio_cip, SIO_VT1211_DEVID);
if (devid != SIO_VT1211_ID)
goto EXIT;