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authorPali Rohár <pali.rohar@gmail.com>2015-01-12 14:32:03 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-25 09:17:59 -0800
commit8f21d8e939b8be096d6f8b6f4386a1f616e307a9 (patch)
tree90a4558a4f8715303482ee1037d9f700f6388dfe
parent7f69fb033b38022554fc43f991aef030021b2d91 (diff)
downloadlinux-8f21d8e939b8be096d6f8b6f4386a1f616e307a9.tar.bz2
i8k: Autodetect fan RPM multiplier
This patch adds new function i8k_get_fan_nominal_speed() for doing SMM call which will return nominal fan RPM for specified fan speed. It returns nominal RPM value at which fan operate when speed (0, 1, 2, 3) is set. It looks like RPM value is not accurate, but still provides very useful information. New function i8k_get_fan_nominal_speed() is used for determinate if fan multiplier is 1 or 30. If function for maximal fan value success and returned RPM value too high (above 30000) then fan multiplier is set to 1. Otherwise multiplier is not changed and default value 30 is used. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Tested-by: Pali Rohár <pali.rohar@gmail.com> Tested-by: Gabriele Mazzotta <gabriele.mzt@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/char/i8k.c60
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(&regs) ? : (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;
}