diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/i8k.c | 60 |
1 files changed, 48 insertions, 12 deletions
diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c index d6e8a267d3a6..6ad087240cef 100644 --- a/drivers/char/i8k.c +++ b/drivers/char/i8k.c @@ -6,6 +6,7 @@ * Hwmon integration: * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> * Copyright (C) 2013, 2014 Guenter Roeck <linux@roeck-us.net> + * Copyright (C) 2014 Pali Rohár <pali.rohar@gmail.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the @@ -42,12 +43,14 @@ #define I8K_SMM_SET_FAN 0x01a3 #define I8K_SMM_GET_FAN 0x00a3 #define I8K_SMM_GET_SPEED 0x02a3 +#define I8K_SMM_GET_NOM_SPEED 0x04a3 #define I8K_SMM_GET_TEMP 0x10a3 #define I8K_SMM_GET_TEMP_TYPE 0x11a3 #define I8K_SMM_GET_DELL_SIG1 0xfea3 #define I8K_SMM_GET_DELL_SIG2 0xffa3 #define I8K_FAN_MULT 30 +#define I8K_FAN_MAX_RPM 30000 #define I8K_MAX_TEMP 127 #define I8K_FN_NONE 0x00 @@ -64,7 +67,7 @@ static DEFINE_MUTEX(i8k_mutex); static char bios_version[4]; static struct device *i8k_hwmon_dev; static u32 i8k_hwmon_flags; -static uint i8k_fan_mult; +static uint i8k_fan_mult = I8K_FAN_MULT; static uint i8k_pwm_mult; static uint i8k_fan_max = I8K_FAN_HIGH; @@ -95,13 +98,13 @@ static bool power_status; module_param(power_status, bool, 0600); MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k"); -static uint fan_mult = I8K_FAN_MULT; +static uint fan_mult; module_param(fan_mult, uint, 0); -MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with"); +MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with (default: autodetect)"); -static uint fan_max = I8K_FAN_HIGH; +static uint fan_max; module_param(fan_max, uint, 0); -MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed"); +MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed (default: autodetect)"); static int i8k_open_fs(struct inode *inode, struct file *file); static long i8k_ioctl(struct file *, unsigned int, unsigned long); @@ -276,6 +279,17 @@ static int i8k_get_fan_speed(int fan) } /* + * Read the fan nominal rpm for specific fan speed. + */ +static int i8k_get_fan_nominal_speed(int fan, int speed) +{ + struct smm_regs regs = { .eax = I8K_SMM_GET_NOM_SPEED, }; + + regs.ebx = (fan & 0xff) | (speed << 8); + return i8k_smm(®s) ? : (regs.eax & 0xffff) * i8k_fan_mult; +} + +/* * Set the fan speed (off, low, high). Returns the new fan status. */ static int i8k_set_fan(int fan, int speed) @@ -863,6 +877,7 @@ MODULE_DEVICE_TABLE(dmi, i8k_dmi_table); static int __init i8k_probe(void) { const struct dmi_system_id *id; + int fan, ret; /* * Get DMI information @@ -891,19 +906,40 @@ static int __init i8k_probe(void) return -ENODEV; } - i8k_fan_mult = fan_mult; - i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ + /* + * Set fan multiplier and maximal fan speed from dmi config + * Values specified in module parameters override values from dmi + */ id = dmi_first_match(i8k_dmi_table); if (id && id->driver_data) { const struct i8k_config_data *conf = id->driver_data; - - if (fan_mult == I8K_FAN_MULT && conf->fan_mult) - i8k_fan_mult = conf->fan_mult; - if (fan_max == I8K_FAN_HIGH && conf->fan_max) - i8k_fan_max = conf->fan_max; + if (!fan_mult && conf->fan_mult) + fan_mult = conf->fan_mult; + if (!fan_max && conf->fan_max) + fan_max = conf->fan_max; } + + i8k_fan_max = fan_max ? : I8K_FAN_HIGH; /* Must not be 0 */ i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max); + if (!fan_mult) { + /* + * Autodetect fan multiplier based on nominal rpm + * If fan reports rpm value too high then set multiplier to 1 + */ + for (fan = 0; fan < 2; ++fan) { + ret = i8k_get_fan_nominal_speed(fan, i8k_fan_max); + if (ret < 0) + continue; + if (ret > I8K_FAN_MAX_RPM) + i8k_fan_mult = 1; + break; + } + } else { + /* Fan multiplier was specified in module param or in dmi */ + i8k_fan_mult = fan_mult; + } + return 0; } |