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Date: Sun, 21 Dec 2014 15:01:49 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Pali Rohár <pali.rohar@...il.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC: linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/10] i8k: Add support for fan labels
On 12/21/2014 11:54 AM, Pali Rohár wrote:
> This patch adds labels support for fans if SMM function with EAX register
> 0x03a3 reports it. This information was taken from DOS binary NBSVC.MDM.
>
> Additionally this patch change detection of fan presece. Instead reading fan
> status now detection is based on new label SMM function. Dell DOS binary
> NBSVC.MDM is doing similar checks, so we should do that too.
>
> This patch also remove I8K_FAN_LEFT and I8K_FAN_RIGHT usage from hwmon driver
> part because that names does not make sense anymore. So numeric constants are
> used instead. Original /proc/i8k ioctl part was not changed for compatibility
> reasons.
>
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> ---
> drivers/char/i8k.c | 76 ++++++++++++++++++++++++++++++++++++++++++----------
> 1 file changed, 62 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
> index 9288edb..ca4203c 100644
> --- a/drivers/char/i8k.c
> +++ b/drivers/char/i8k.c
> @@ -43,6 +43,7 @@
> #define I8K_SMM_SET_FAN 0x01a3
> #define I8K_SMM_GET_FAN 0x00a3
> #define I8K_SMM_GET_SPEED 0x02a3
> +#define I8K_SMM_GET_FAN_TYPE 0x03a3
> #define I8K_SMM_GET_NOM_SPEED 0x04a3
> #define I8K_SMM_GET_TEMP 0x10a3
> #define I8K_SMM_GET_TEMP_TYPE 0x11a3
> @@ -279,6 +280,17 @@ static int i8k_get_fan_speed(int fan)
> }
>
> /*
> + * Read the fan type.
> + */
> +static int i8k_get_fan_type(int fan)
> +{
> + struct smm_regs regs = { .eax = I8K_SMM_GET_FAN_TYPE, };
> +
> + regs.ebx = fan & 0xff;
> + return i8k_smm(®s) ? : regs.eax & 0xff;
> +}
> +
> +/*
> * Read the fan nominal rpm for specific fan speed.
> */
> static int i8k_get_fan_nominal_speed(int fan, int speed)
> @@ -553,6 +565,37 @@ static ssize_t i8k_hwmon_show_temp(struct device *dev,
> return sprintf(buf, "%d\n", temp * 1000);
> }
>
> +static ssize_t i8k_hwmon_show_fan_label(struct device *dev,
> + struct device_attribute *devattr,
> + char *buf)
> +{
> + static const char * const labels[] = {
> + "Processor Fan",
> + "Motherboard Fan",
> + "Video Fan",
> + "Power Supply Fan",
> + "Chipset Fan",
> + "Other Fan",
> + };
> + int index = to_sensor_dev_attr(devattr)->index;
> + bool dock = false;
> + int type;
> +
> + type = i8k_get_fan_type(index);
> + if (type < 0)
> + return type;
> +
> + if (type & 0x10) {
> + dock = true;
> + type &= 0x0F;
> + }
> +
What if bit 5..7 is set ? This would result in a result of "other fan",
which given the above does not seem to be correct. Given that, I wonder
why the type mask is only applied if bit 4 is set and not unconditionally.
Thanks,
Guenter
> + if (type >= ARRAY_SIZE(labels))
> + type = (ARRAY_SIZE(labels) - 1);
> +
> + return sprintf(buf, "%s%s\n", (dock ? "Docking " : ""), labels[type]);
> +}
> +
> static ssize_t i8k_hwmon_show_fan(struct device *dev,
> struct device_attribute *devattr,
> char *buf)
> @@ -611,14 +654,17 @@ static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
> static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 3);
> static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL,
> 3);
> -static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
> - I8K_FAN_LEFT);
> +static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, i8k_hwmon_show_fan, NULL, 0);
> +static SENSOR_DEVICE_ATTR(fan1_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
> + 0);
> static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
> - i8k_hwmon_set_pwm, I8K_FAN_LEFT);
> + i8k_hwmon_set_pwm, 0);
> static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, i8k_hwmon_show_fan, NULL,
> - I8K_FAN_RIGHT);
> + 1);
> +static SENSOR_DEVICE_ATTR(fan2_label, S_IRUGO, i8k_hwmon_show_fan_label, NULL,
> + 1);
> static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
> - i8k_hwmon_set_pwm, I8K_FAN_RIGHT);
> + i8k_hwmon_set_pwm, 1);
>
> static struct attribute *i8k_attrs[] = {
> &sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
> @@ -630,9 +676,11 @@ static struct attribute *i8k_attrs[] = {
> &sensor_dev_attr_temp4_input.dev_attr.attr, /* 6 */
> &sensor_dev_attr_temp4_label.dev_attr.attr, /* 7 */
> &sensor_dev_attr_fan1_input.dev_attr.attr, /* 8 */
> - &sensor_dev_attr_pwm1.dev_attr.attr, /* 9 */
> - &sensor_dev_attr_fan2_input.dev_attr.attr, /* 10 */
> - &sensor_dev_attr_pwm2.dev_attr.attr, /* 11 */
> + &sensor_dev_attr_fan1_label.dev_attr.attr, /* 9 */
> + &sensor_dev_attr_pwm1.dev_attr.attr, /* 10 */
> + &sensor_dev_attr_fan2_input.dev_attr.attr, /* 11 */
> + &sensor_dev_attr_fan2_label.dev_attr.attr, /* 12 */
> + &sensor_dev_attr_pwm2.dev_attr.attr, /* 13 */
> NULL
> };
>
> @@ -651,10 +699,10 @@ static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
> if (index >= 6 && index <= 7 &&
> !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
> return 0;
> - if (index >= 8 && index <= 9 &&
> + if (index >= 8 && index <= 10 &&
> !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
> return 0;
> - if (index >= 10 && index <= 11 &&
> + if (index >= 11 && index <= 13 &&
> !(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
> return 0;
>
> @@ -688,13 +736,13 @@ static int __init i8k_init_hwmon(void)
> if (err >= 0)
> i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;
>
> - /* Left fan attributes, if left fan is present */
> - err = i8k_get_fan_status(I8K_FAN_LEFT);
> + /* First fan attributes, if fan type is OK */
> + err = i8k_get_fan_type(0);
> if (err >= 0)
> i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN1;
>
> - /* Right fan attributes, if right fan is present */
> - err = i8k_get_fan_status(I8K_FAN_RIGHT);
> + /* Second fan attributes, if fan type is OK */
> + err = i8k_get_fan_type(1);
> if (err >= 0)
> i8k_hwmon_flags |= I8K_HWMON_HAVE_FAN2;
>
>
--
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