diff options
Diffstat (limited to 'drivers/misc/thinkpad_acpi.c')
| -rw-r--r-- | drivers/misc/thinkpad_acpi.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c index c0a023cc5de..7dc3a220619 100644 --- a/drivers/misc/thinkpad_acpi.c +++ b/drivers/misc/thinkpad_acpi.c @@ -2935,6 +2935,9 @@ static ssize_t fan_fan_watchdog_store(struct device_driver *drv, if (parse_strtoul(buf, 120, &t)) return -EINVAL; + if (!fan_control_allowed) + return -EPERM; + fan_watchdog_maxinterval = t; fan_watchdog_reset(); @@ -3046,6 +3049,14 @@ static int __init fan_init(struct ibm_init_struct *iibm) fan_control_access_mode != TPACPI_FAN_WR_NONE), fan_status_access_mode, fan_control_access_mode); + /* fan control master switch */ + if (!fan_control_allowed) { + fan_control_access_mode = TPACPI_FAN_WR_NONE; + fan_control_commands = 0; + dbg_printk(TPACPI_DBG_INIT, + "fan control features disabled by parameter\n"); + } + /* update fan_control_desired_level */ if (fan_status_access_mode != TPACPI_FAN_NONE) fan_get_status_safe(NULL); @@ -3203,6 +3214,9 @@ static void fan_watchdog_reset(void) static int fan_set_level(int level) { + if (!fan_control_allowed) + return -EPERM; + switch (fan_control_access_mode) { case TPACPI_FAN_WR_ACPI_SFAN: if (level >= 0 && level <= 7) { @@ -3242,6 +3256,9 @@ static int fan_set_level_safe(int level) { int rc; + if (!fan_control_allowed) + return -EPERM; + rc = mutex_lock_interruptible(&fan_mutex); if (rc < 0) return rc; @@ -3262,6 +3279,9 @@ static int fan_set_enable(void) u8 s; int rc; + if (!fan_control_allowed) + return -EPERM; + rc = mutex_lock_interruptible(&fan_mutex); if (rc < 0) return rc; @@ -3315,6 +3335,9 @@ static int fan_set_disable(void) { int rc; + if (!fan_control_allowed) + return -EPERM; + rc = mutex_lock_interruptible(&fan_mutex); if (rc < 0) return rc; @@ -3351,6 +3374,9 @@ static int fan_set_speed(int speed) { int rc; + if (!fan_control_allowed) + return -EPERM; + rc = mutex_lock_interruptible(&fan_mutex); if (rc < 0) return rc; @@ -3558,7 +3584,6 @@ static struct ibm_struct fan_driver_data = { .read = fan_read, .write = fan_write, .exit = fan_exit, - .flags.experimental = 1, }; /**************************************************************************** @@ -3879,6 +3904,9 @@ module_param_named(debug, dbg_level, uint, 0); static int force_load; module_param(force_load, int, 0); +static int fan_control_allowed; +module_param_named(fan_control, fan_control_allowed, int, 0); + #define IBM_PARAM(feature) \ module_param_call(feature, set_ibm_param, NULL, NULL, 0) |