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Subject[PATCH] i8k: Add support for temperature sensor labels
Date
This patch adds labels for temperature sensors if SMM function with EAX register
0x11a3 reports it. These informations was taken from DOS binary NBSVC.MDM.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
---
drivers/char/i8k.c | 110 +++++++++++++++++++++++++++++++++++++++++-----------
1 file changed, 88 insertions(+), 22 deletions(-)

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index e34a019..77af46b 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -42,6 +42,7 @@
#define I8K_SMM_GET_FAN 0x00a3
#define I8K_SMM_GET_SPEED 0x02a3
#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

@@ -288,6 +289,14 @@ static int i8k_set_fan(int fan, int speed)
return i8k_smm(&regs) ? : i8k_get_fan_status(fan);
}

+static int i8k_get_temp_type(int sensor)
+{
+ struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP_TYPE, };
+
+ regs.ebx = sensor & 0xff;
+ return i8k_smm(&regs) ? : regs.eax & 0xff;
+}
+
/*
* Read the cpu temperature.
*/
@@ -493,6 +502,29 @@ static int i8k_open_fs(struct inode *inode, struct file *file)
* Hwmon interface
*/

+static ssize_t i8k_hwmon_show_temp_label(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ static const char * const labels[] = {
+ "CPU",
+ "GPU",
+ "SODIMM",
+ "Other",
+ "Ambient",
+ "Other",
+ };
+ int index = to_sensor_dev_attr(devattr)->index;
+ int type;
+
+ type = i8k_get_temp_type(index);
+ if (type < 0)
+ return type;
+ if (type >= ARRAY_SIZE(labels))
+ type = ARRAY_SIZE(labels) - 1;
+ return sprintf(buf, "%s\n", labels[type]);
+}
+
static ssize_t i8k_hwmon_show_temp(struct device *dev,
struct device_attribute *devattr,
char *buf)
@@ -555,9 +587,13 @@ static ssize_t i8k_hwmon_set_pwm(struct device *dev,
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, i8k_hwmon_show_temp, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, i8k_hwmon_show_temp_label, NULL, 2);
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(pwm1, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,
@@ -569,31 +605,35 @@ static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, i8k_hwmon_show_pwm,

static struct attribute *i8k_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr, /* 0 */
- &sensor_dev_attr_temp2_input.dev_attr.attr, /* 1 */
- &sensor_dev_attr_temp3_input.dev_attr.attr, /* 2 */
- &sensor_dev_attr_temp4_input.dev_attr.attr, /* 3 */
- &sensor_dev_attr_fan1_input.dev_attr.attr, /* 4 */
- &sensor_dev_attr_pwm1.dev_attr.attr, /* 5 */
- &sensor_dev_attr_fan2_input.dev_attr.attr, /* 6 */
- &sensor_dev_attr_pwm2.dev_attr.attr, /* 7 */
+ &sensor_dev_attr_temp1_label.dev_attr.attr, /* 1 */
+ &sensor_dev_attr_temp2_input.dev_attr.attr, /* 2 */
+ &sensor_dev_attr_temp2_label.dev_attr.attr, /* 3 */
+ &sensor_dev_attr_temp3_input.dev_attr.attr, /* 4 */
+ &sensor_dev_attr_temp3_label.dev_attr.attr, /* 5 */
+ &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 */
NULL
};

static umode_t i8k_is_visible(struct kobject *kobj, struct attribute *attr,
int index)
{
- if (index == 0 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
+ if (index >= 0 && index <= 1 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP1))
return 0;
- if (index == 1 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
+ if (index >= 2 && index <= 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP2))
return 0;
- if (index == 2 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
+ if (index >= 4 && index <= 5 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP3))
return 0;
- if (index == 3 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
+ if (index >= 6 && index <= 7 && !(i8k_hwmon_flags & I8K_HWMON_HAVE_TEMP4))
return 0;
- if (index >= 4 && index <= 5 &&
+ if (index >= 8 && index <= 9 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN1))
return 0;
- if (index >= 6 && index <= 7 &&
+ if (index >= 10 && index <= 11 &&
!(i8k_hwmon_flags & I8K_HWMON_HAVE_FAN2))
return 0;

@@ -606,6 +646,37 @@ static const struct attribute_group i8k_group = {
};
__ATTRIBUTE_GROUPS(i8k);

+static bool __init i8k_check_temp(int sensor)
+{
+ int err;
+
+ /*
+ * Check if temperature sensor type is valid.
+ *
+ * If it is valid then sensor should work. But some sensors are not
+ * available at any time. E.g GPU sensor on Optimus/PowerExpress/Enduro
+ * card does not work (or return bogus value) when card is turned off.
+ * So this function should not fail in this case.
+ */
+ err = i8k_get_temp_type(sensor);
+ if (err >= 0)
+ return true;
+
+ /*
+ * Check if temperatrue reading does not fail.
+ *
+ * Sometimes detection of temperature sensor type does not work but
+ * reading temperature working fine. Sometimes temperature value is too
+ * high and i8k_get_temp() returns -ERANGE. But there is no reason to
+ * ignore these temperature sensors.
+ */
+ err = i8k_get_temp(sensor);
+ if (err >= 0 || err == -ERANGE)
+ return true;
+
+ return false;
+}
+
static int __init i8k_init_hwmon(void)
{
int err;
@@ -613,18 +684,13 @@ static int __init i8k_init_hwmon(void)
i8k_hwmon_flags = 0;

/* CPU temperature attributes, if temperature reading is OK */
- err = i8k_get_temp(0);
- if (err >= 0 || err == -ERANGE)
+ if (i8k_check_temp(0))
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP1;
- /* check for additional temperature sensors */
- err = i8k_get_temp(1);
- if (err >= 0 || err == -ERANGE)
+ if (i8k_check_temp(1))
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP2;
- err = i8k_get_temp(2);
- if (err >= 0 || err == -ERANGE)
+ if (i8k_check_temp(2))
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP3;
- err = i8k_get_temp(3);
- if (err >= 0 || err == -ERANGE)
+ if (i8k_check_temp(3))
i8k_hwmon_flags |= I8K_HWMON_HAVE_TEMP4;

/* Left fan attributes, if left fan is present */
--
1.7.9.5


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