From 8fcfb776660e9d737c9e1be9cc06b6aa725e3b65 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Wed, 14 Nov 2012 10:31:29 +1100 Subject: [PATCH] hwmon: (it87) Introduce support for tempX_offset sysfs attribute Signed-off-by: Guenter Roeck Signed-off-by: Jean Delvare --- Documentation/hwmon/it87 | 9 ++++++ drivers/hwmon/it87.c | 66 +++++++++++++++++++++++++++++++++++++--- 2 files changed, 70 insertions(+), 5 deletions(-) diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87 index 87850d86c559..e1f38287fbb3 100644 --- a/Documentation/hwmon/it87 +++ b/Documentation/hwmon/it87 @@ -209,3 +209,12 @@ doesn't use CPU cycles. Trip points must be set properly before switching to automatic fan speed control mode. The driver will perform basic integrity checks before actually switching to automatic control mode. + + +Temperature offset attributes +----------------------------- + +The driver supports temp[1-3]_offset sysfs attributes to adjust the reported +temperature for thermal diodes or diode-connected thermal transistors. +If a temperature sensor is configured for thermistors, the attribute values +are ignored. diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index b6d72534d4d6..7e4f4183285c 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -203,6 +203,8 @@ static const u8 IT87_REG_FAN[] = { 0x0d, 0x0e, 0x0f, 0x80, 0x82 }; static const u8 IT87_REG_FAN_MIN[] = { 0x10, 0x11, 0x12, 0x84, 0x86 }; static const u8 IT87_REG_FANX[] = { 0x18, 0x19, 0x1a, 0x81, 0x83 }; static const u8 IT87_REG_FANX_MIN[] = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 }; +static const u8 IT87_REG_TEMP_OFFSET[] = { 0x56, 0x57, 0x59 }; + #define IT87_REG_FAN_MAIN_CTRL 0x13 #define IT87_REG_FAN_CTL 0x14 #define IT87_REG_PWM(nr) (0x15 + (nr)) @@ -263,7 +265,7 @@ struct it87_data { u16 fan[5]; /* Register values, possibly combined */ u16 fan_min[5]; /* Register values, possibly combined */ u8 has_temp; /* Bitfield, temp sensors enabled */ - s8 temp[3][3]; /* [nr][0]=temp, [1]=min, [2]=max */ + s8 temp[3][4]; /* [nr][0]=temp, [1]=min, [2]=max, [3]=offset */ u8 sensor; /* Register value */ u8 fan_div[3]; /* Register encoding, shifted right */ u8 vid; /* Register encoding, combined */ @@ -312,6 +314,17 @@ static inline int has_newer_autopwm(const struct it87_data *data) || data->type == it8728; } +static inline int has_temp_offset(const struct it87_data *data) +{ + return data->type == it8716 + || data->type == it8718 + || data->type == it8720 + || data->type == it8721 + || data->type == it8728 + || data->type == it8782 + || data->type == it8783; +} + static int adc_lsb(const struct it87_data *data, int nr) { int lsb = has_12mv_adc(data) ? 12 : 16; @@ -546,16 +559,34 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *attr, int index = sattr->index; struct it87_data *data = dev_get_drvdata(dev); long val; + u8 reg, regval; if (kstrtol(buf, 10, &val) < 0) return -EINVAL; mutex_lock(&data->update_lock); + + switch (index) { + default: + case 1: + reg = IT87_REG_TEMP_LOW(nr); + break; + case 2: + reg = IT87_REG_TEMP_HIGH(nr); + break; + case 3: + regval = it87_read_value(data, IT87_REG_BEEP_ENABLE); + if (!(regval & 0x80)) { + regval |= 0x80; + it87_write_value(data, IT87_REG_BEEP_ENABLE, regval); + } + data->valid = 0; + reg = IT87_REG_TEMP_OFFSET[nr]; + break; + } + data->temp[nr][index] = TEMP_TO_REG(val); - it87_write_value(data, - index == 1 ? IT87_REG_TEMP_LOW(nr) - : IT87_REG_TEMP_HIGH(nr), - data->temp[nr][index]); + it87_write_value(data, reg, data->temp[nr][index]); mutex_unlock(&data->update_lock); return count; } @@ -565,16 +596,22 @@ static SENSOR_DEVICE_ATTR_2(temp1_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 0, 1); static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 0, 2); +static SENSOR_DEVICE_ATTR_2(temp1_offset, S_IRUGO | S_IWUSR, show_temp, + set_temp, 0, 3); static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0); static SENSOR_DEVICE_ATTR_2(temp2_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 1, 1); static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 1, 2); +static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IRUGO | S_IWUSR, show_temp, + set_temp, 1, 3); static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 2, 0); static SENSOR_DEVICE_ATTR_2(temp3_min, S_IRUGO | S_IWUSR, show_temp, set_temp, 2, 1); static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp, 2, 2); +static SENSOR_DEVICE_ATTR_2(temp3_offset, S_IRUGO | S_IWUSR, show_temp, + set_temp, 2, 3); static ssize_t show_temp_type(struct device *dev, struct device_attribute *attr, char *buf) @@ -1429,6 +1466,12 @@ static const struct attribute_group it87_group_temp[3] = { { .attrs = it87_attributes_temp[2] }, }; +static struct attribute *it87_attributes_temp_offset[] = { + &sensor_dev_attr_temp1_offset.dev_attr.attr, + &sensor_dev_attr_temp2_offset.dev_attr.attr, + &sensor_dev_attr_temp3_offset.dev_attr.attr, +}; + static struct attribute *it87_attributes[] = { &dev_attr_alarms.attr, &sensor_dev_attr_intrusion0_alarm.dev_attr.attr, @@ -1899,6 +1942,9 @@ static void it87_remove_files(struct device *dev) if (!(data->has_temp & (1 << i))) continue; sysfs_remove_group(&dev->kobj, &it87_group_temp[i]); + if (has_temp_offset(data)) + sysfs_remove_file(&dev->kobj, + it87_attributes_temp_offset[i]); if (sio_data->beep_pin) sysfs_remove_file(&dev->kobj, it87_attributes_temp_beep[i]); @@ -2026,6 +2072,12 @@ static int __devinit it87_probe(struct platform_device *pdev) err = sysfs_create_group(&dev->kobj, &it87_group_temp[i]); if (err) goto error; + if (has_temp_offset(data)) { + err = sysfs_create_file(&dev->kobj, + it87_attributes_temp_offset[i]); + if (err) + goto error; + } if (sio_data->beep_pin) { err = sysfs_create_file(&dev->kobj, it87_attributes_temp_beep[i]); @@ -2383,6 +2435,10 @@ static struct it87_data *it87_update_device(struct device *dev) it87_read_value(data, IT87_REG_TEMP_LOW(i)); data->temp[i][2] = it87_read_value(data, IT87_REG_TEMP_HIGH(i)); + if (has_temp_offset(data)) + data->temp[i][3] = + it87_read_value(data, + IT87_REG_TEMP_OFFSET[i]); } /* Newer chips don't have clock dividers */ -- 2.39.5