hwmon: (it87) Expose the PWM/temperature mappings

Let the user read the PWM-to-temperature mappings. Until the trip
points are also exposed, this is essentially a way to know how the
BIOS has set things up. The ability to change the settings will be
added later, together with the trip points.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 69 insertions, 4 deletions

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 49022bd2a0a5..41b55a74ce89 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -751,6 +751,59 @@ static ssize_t set_pwm_freq(struct device *dev,
 
         return count;
 }
+static ssize_t show_pwm_temp_map(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = it87_update_device(dev);
+        int map;
+
+        if (data->pwm_temp_map[nr] < 3)
+                map = 1 << data->pwm_temp_map[nr];
+        else
+                map = 0;                        /* Should never happen */
+        return sprintf(buf, "%d\n", map);
+}
+static ssize_t set_pwm_temp_map(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
+        int nr = sensor_attr->index;
+
+        struct it87_data *data = dev_get_drvdata(dev);
+        long val;
+        u8 reg;
+
+        if (strict_strtol(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        switch (val) {
+        case (1 << 0):
+                reg = 0x00;
+                break;
+        case (1 << 1):
+                reg = 0x01;
+                break;
+        case (1 << 2):
+                reg = 0x02;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        mutex_lock(&data->update_lock);
+        data->pwm_temp_map[nr] = reg;
+        /* If we are in automatic mode, write the temp mapping immediately;
+         * otherwise, just store it for later use. */
+        if (data->pwm_ctrl[nr] & 0x80) {
+                data->pwm_ctrl[nr] = 0x80 | data->pwm_temp_map[nr];
+                it87_write_value(data, IT87_REG_PWM(nr), data->pwm_ctrl[nr]);
+        }
+        mutex_unlock(&data->update_lock);
+        return count;
+}
 
 #define show_fan_offset(offset)                                 \
 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,         \
@@ -771,7 +824,10 @@ static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,		\
                 show_pwm, set_pwm, offset - 1);                         \
 static DEVICE_ATTR(pwm##offset##_freq,                                  \
                 (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO),            \
-                show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));
+                show_pwm_freq, (offset == 1 ? set_pwm_freq : NULL));    \
+static SENSOR_DEVICE_ATTR(pwm##offset##_auto_channels_temp,             \
+                S_IRUGO, show_pwm_temp_map, set_pwm_temp_map,           \
+                offset - 1);
 
 show_pwm_offset(1);
 show_pwm_offset(2);
@@ -995,6 +1051,9 @@ static struct attribute *it87_attributes_opt[] = {
         &dev_attr_pwm1_freq.attr,
         &dev_attr_pwm2_freq.attr,
         &dev_attr_pwm3_freq.attr,
+        &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
+        &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
+        &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
 
         &dev_attr_vrm.attr,
         &dev_attr_cpu0_vid.attr,
@@ -1268,7 +1327,9 @@ static int __devinit it87_probe(struct platform_device *pdev)
                          || (err = device_create_file(dev,
                              &sensor_dev_attr_pwm1.dev_attr))
                          || (err = device_create_file(dev,
-                             &dev_attr_pwm1_freq)))
+                             &dev_attr_pwm1_freq))
+                         || (err = device_create_file(dev,
+                             &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr)))
                                 goto ERROR4;
                 }
                 if (!(sio_data->skip_pwm & (1 << 1))) {
@@ -1277,7 +1338,9 @@ static int __devinit it87_probe(struct platform_device *pdev)
                          || (err = device_create_file(dev,
                              &sensor_dev_attr_pwm2.dev_attr))
                          || (err = device_create_file(dev,
-                             &dev_attr_pwm2_freq)))
+                             &dev_attr_pwm2_freq))
+                         || (err = device_create_file(dev,
+                             &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr)))
                                 goto ERROR4;
                 }
                 if (!(sio_data->skip_pwm & (1 << 2))) {
@@ -1286,7 +1349,9 @@ static int __devinit it87_probe(struct platform_device *pdev)
                          || (err = device_create_file(dev,
                              &sensor_dev_attr_pwm3.dev_attr))
                          || (err = device_create_file(dev,
-                             &dev_attr_pwm3_freq)))
+                             &dev_attr_pwm3_freq))
+                         || (err = device_create_file(dev,
+                             &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr)))
                                 goto ERROR4;
                 }
         }