[PATCH] i8k: Add support for temperature sensor labels

From: Pali RohÃr
Date: Sat Nov 29 2014 - 11:05:20 EST

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 RohÃr <pali.rohar@xxxxxxxxx>
---
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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