diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/smsc47m1.c | 30 |
1 files changed, 27 insertions, 3 deletions
diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c index 92cca512b38e..9ca97818bd4b 100644 --- a/drivers/hwmon/smsc47m1.c +++ b/drivers/hwmon/smsc47m1.c @@ -136,6 +136,7 @@ struct smsc47m1_data { struct smsc47m1_sio_data { enum chips type; + u8 activate; /* Remember initial device state */ }; @@ -468,17 +469,38 @@ static int __init smsc47m1_find(unsigned short *addr, superio_select(); *addr = (superio_inb(SUPERIO_REG_BASE) << 8) | superio_inb(SUPERIO_REG_BASE + 1); - val = superio_inb(SUPERIO_REG_ACT); - if (*addr == 0 || (val & 0x01) == 0) { - pr_info(DRVNAME ": Device is disabled, will not use\n"); + if (*addr == 0) { + pr_info(DRVNAME ": Device address not set, will not use\n"); superio_exit(); return -ENODEV; } + /* Enable only if address is set (needed at least on the + * Compaq Presario S4000NX) */ + sio_data->activate = superio_inb(SUPERIO_REG_ACT); + if ((sio_data->activate & 0x01) == 0) { + pr_info(DRVNAME ": Enabling device\n"); + superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01); + } + superio_exit(); return 0; } +/* Restore device to its initial state */ +static void __init smsc47m1_restore(const struct smsc47m1_sio_data *sio_data) +{ + if ((sio_data->activate & 0x01) == 0) { + superio_enter(); + superio_select(); + + pr_info(DRVNAME ": Disabling device\n"); + superio_outb(SUPERIO_REG_ACT, sio_data->activate); + + superio_exit(); + } +} + #define CHECK 1 #define REQUEST 2 #define RELEASE 3 @@ -856,6 +878,7 @@ static int __init sm_smsc47m1_init(void) exit_device: platform_device_unregister(pdev); + smsc47m1_restore(&sio_data); exit: return err; } @@ -863,6 +886,7 @@ exit: static void __exit sm_smsc47m1_exit(void) { platform_driver_unregister(&smsc47m1_driver); + smsc47m1_restore(pdev->dev.platform_data); platform_device_unregister(pdev); } |