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Commit 81474fc2 authored by Guenter Roeck's avatar Guenter Roeck Committed by Greg Kroah-Hartman
Browse files

i8k: Add support for configurable maximum fan speed value 



Newer Dell systems provide more granular fan speed selection.
Add support for it.

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Cc: Andreas Mohr <andi@lisas.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b12ce5f2

drivers/char/i8k.c

+42 −7
Original line number Diff line number Diff line
@@ -65,6 +65,8 @@ static char bios_version[4]; 
static struct device *i8k_hwmon_dev;

static u32 i8k_hwmon_flags;

static int i8k_fan_mult;

static int i8k_pwm_mult;

static int i8k_fan_max = I8K_FAN_HIGH;



#define I8K_HWMON_HAVE_TEMP1	(1 << 0)

#define I8K_HWMON_HAVE_TEMP2	(1 << 1)
@@ -97,6 +99,10 @@ static int fan_mult = I8K_FAN_MULT; 
module_param(fan_mult, int, 0);

MODULE_PARM_DESC(fan_mult, "Factor to multiply fan speed with");



static int fan_max = I8K_FAN_HIGH;

module_param(fan_max, int, 0);

MODULE_PARM_DESC(fan_max, "Maximum configurable fan speed");



static int i8k_open_fs(struct inode *inode, struct file *file);

static long i8k_ioctl(struct file *, unsigned int, unsigned long);
@@ -274,7 +280,7 @@ static int i8k_set_fan(int fan, int speed) 
{

	struct smm_regs regs = { .eax = I8K_SMM_SET_FAN, };



	speed = (speed < 0) ? 0 : ((speed > I8K_FAN_MAX) ? I8K_FAN_MAX : speed);

	speed = (speed < 0) ? 0 : ((speed > i8k_fan_max) ? i8k_fan_max : speed);

	regs.ebx = (fan & 0xff) | (speed << 8);



	return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
@@ -519,7 +525,7 @@ static ssize_t i8k_hwmon_show_pwm(struct device *dev, 
	status = i8k_get_fan_status(index);

	if (status < 0)

		return -EIO;

	return sprintf(buf, "%d\n", clamp_val(status * 128, 0, 255));

	return sprintf(buf, "%d\n", clamp_val(status * i8k_pwm_mult, 0, 255));

}



static ssize_t i8k_hwmon_set_pwm(struct device *dev,
@@ -533,7 +539,7 @@ static ssize_t i8k_hwmon_set_pwm(struct device *dev, 
	err = kstrtoul(buf, 10, &val);

	if (err)

		return err;

	val = clamp_val(DIV_ROUND_CLOSEST(val, 128), 0, 2);

	val = clamp_val(DIV_ROUND_CLOSEST(val, i8k_pwm_mult), 0, i8k_fan_max);



	mutex_lock(&i8k_mutex);

	err = i8k_set_fan(index, val);
@@ -636,6 +642,27 @@ static int __init i8k_init_hwmon(void) 
	return 0;

}



struct i8k_config_data {

	int fan_mult;

	int fan_max;

};



enum i8k_configs {

	DELL_STUDIO,

	DELL_XPS_M140,

};



static const struct i8k_config_data i8k_config_data[] = {

	[DELL_STUDIO] = {

		.fan_mult = 1,

		.fan_max = I8K_FAN_HIGH,

	},

	[DELL_XPS_M140] = {

		.fan_mult = 1,

		.fan_max = I8K_FAN_HIGH,

	},

};



static struct dmi_system_id i8k_dmi_table[] __initdata = {

	{

		.ident = "Dell Inspiron",
@@ -706,7 +733,7 @@ static struct dmi_system_id i8k_dmi_table[] __initdata = { 
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),

			DMI_MATCH(DMI_PRODUCT_NAME, "Studio"),

		},

		.driver_data = (void *)1,	/* fan multiplier override */

		.driver_data = (void *)&i8k_config_data[DELL_STUDIO],

	},

	{

		.ident = "Dell XPS M140",
@@ -714,7 +741,7 @@ static struct dmi_system_id i8k_dmi_table[] __initdata = { 
			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),

			DMI_MATCH(DMI_PRODUCT_NAME, "MXC051"),

		},

		.driver_data = (void *)1,	/* fan multiplier override */

		.driver_data = (void *)&i8k_config_data[DELL_XPS_M140],

	},

	{ }

};
@@ -754,9 +781,17 @@ static int __init i8k_probe(void) 
	}



	i8k_fan_mult = fan_mult;

	i8k_fan_max = fan_max ? : I8K_FAN_HIGH;	/* Must not be 0 */

	id = dmi_first_match(i8k_dmi_table);

	if (id && fan_mult == I8K_FAN_MULT && id->driver_data)

		i8k_fan_mult = (unsigned long)id->driver_data;

	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;

	}

	i8k_pwm_mult = DIV_ROUND_UP(255, i8k_fan_max);



	return 0;

}