diff options
| -rw-r--r-- | Documentation/hwmon/it87 | 27 | ||||
| -rw-r--r-- | drivers/hwmon/it87.c | 182 |
2 files changed, 205 insertions, 4 deletions
diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87 index a96a70fe802a..0083bd317351 100644 --- a/Documentation/hwmon/it87 +++ b/Documentation/hwmon/it87 @@ -146,11 +146,34 @@ Fan speed control ----------------- The fan speed control features are limited to manual PWM mode. Automatic -"Smart Guardian" mode control handling is not implemented. However -if you want to go for "manual mode" just write 1 to pwmN_enable. +"Smart Guardian" mode control handling is only implemented for older chips +(see below.) However if you want to go for "manual mode" just write 1 to +pwmN_enable. If you are only able to control the fan speed with very small PWM values, try lowering the PWM base frequency (pwm1_freq). Depending on the fan, it may give you a somewhat greater control range. The same frequency is used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are read-only. + + +Automatic fan speed control (old interface) +------------------------------------------- + +The driver supports the old interface to automatic fan speed control +which is implemented by IT8705F chips up to revision F and IT8712F +chips up to revision G. + +This interface implements 4 temperature vs. PWM output trip points. +The PWM output of trip point 4 is always the maximum value (fan running +at full speed) while the PWM output of the other 3 trip points can be +freely chosen. The temperature of all 4 trip points can be freely chosen. +Additionally, trip point 1 has an hysteresis temperature attached, to +prevent fast switching between fan on and off. + +The chip automatically computes the PWM output value based on the input +temperature, based on this simple rule: if the temperature value is +between trip point N and trip point N+1 then the PWM output value is +the one of trip point N. The automatic control mode is less flexible +than the manual control mode, but it reacts faster, is more robust and +doesn't use CPU cycles. diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 8282282eb4ca..bbb0c7443b9b 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -192,6 +192,9 @@ static const u8 IT87_REG_FANX_MIN[] = { 0x1b, 0x1c, 0x1d, 0x85, 0x87 }; #define IT87_REG_CHIPID 0x58 +#define IT87_REG_AUTO_TEMP(nr, i) (0x60 + (nr) * 8 + (i)) +#define IT87_REG_AUTO_PWM(nr, i) (0x65 + (nr) * 8 + (i)) + #define IN_TO_REG(val) (SENSORS_LIMIT((((val) + 8)/16),0,255)) #define IN_FROM_REG(val) ((val) * 16) @@ -293,6 +296,10 @@ struct it87_data { u8 pwm_ctrl[3]; /* Register value */ u8 pwm_duty[3]; /* Manual PWM value set by user (bit 6-0) */ u8 pwm_temp_map[3]; /* PWM to temp. chan. mapping (bits 1-0) */ + + /* Automatic fan speed control registers */ + u8 auto_pwm[3][4]; /* [nr][3] is hard-coded */ + s8 auto_temp[3][5]; /* [nr][0] is point1_temp_hyst */ }; static inline int has_16bit_fans(const struct it87_data *data) @@ -307,6 +314,15 @@ static inline int has_16bit_fans(const struct it87_data *data) || data->type == it8720; } +static inline int has_old_autopwm(const struct it87_data *data) +{ + /* The old automatic fan speed control interface is implemented + by IT8705F chips up to revision F and IT8712F chips up to + revision G. */ + return (data->type == it87 && data->revision < 0x03) + || (data->type == it8712 && data->revision < 0x08); +} + static int it87_probe(struct platform_device *pdev); static int __devexit it87_remove(struct platform_device *pdev); @@ -813,6 +829,13 @@ static ssize_t set_pwm_temp_map(struct device *dev, long val; u8 reg; + /* This check can go away if we ever support automatic fan speed + control on newer chips. */ + if (!has_old_autopwm(data)) { + dev_notice(dev, "Mapping change disabled for safety reasons\n"); + return -EINVAL; + } + if (strict_strtol(buf, 10, &val) < 0) return -EINVAL; @@ -842,6 +865,72 @@ static ssize_t set_pwm_temp_map(struct device *dev, return count; } +static ssize_t show_auto_pwm(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct it87_data *data = it87_update_device(dev); + struct sensor_device_attribute_2 *sensor_attr = + to_sensor_dev_attr_2(attr); + int nr = sensor_attr->nr; + int point = sensor_attr->index; + + return sprintf(buf, "%d\n", PWM_FROM_REG(data->auto_pwm[nr][point])); +} + +static ssize_t set_auto_pwm(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct it87_data *data = dev_get_drvdata(dev); + struct sensor_device_attribute_2 *sensor_attr = + to_sensor_dev_attr_2(attr); + int nr = sensor_attr->nr; + int point = sensor_attr->index; + long val; + + if (strict_strtol(buf, 10, &val) < 0 || val < 0 || val > 255) + return -EINVAL; + + mutex_lock(&data->update_lock); + data->auto_pwm[nr][point] = PWM_TO_REG(val); + it87_write_value(data, IT87_REG_AUTO_PWM(nr, point), + data->auto_pwm[nr][point]); + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t show_auto_temp(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct it87_data *data = it87_update_device(dev); + struct sensor_device_attribute_2 *sensor_attr = + to_sensor_dev_attr_2(attr); + int nr = sensor_attr->nr; + int point = sensor_attr->index; + + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->auto_temp[nr][point])); +} + +static ssize_t set_auto_temp(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct it87_data *data = dev_get_drvdata(dev); + struct sensor_device_attribute_2 *sensor_attr = + to_sensor_dev_attr_2(attr); + int nr = sensor_attr->nr; + int point = sensor_attr->index; + long val; + + if (strict_strtol(buf, 10, &val) < 0 || val < -128000 || val > 127000) + return -EINVAL; + + mutex_lock(&data->update_lock); + data->auto_temp[nr][point] = TEMP_TO_REG(val); + it87_write_value(data, IT87_REG_AUTO_TEMP(nr, point), + data->auto_temp[nr][point]); + mutex_unlock(&data->update_lock); + return count; +} + #define show_fan_offset(offset) \ static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ show_fan, NULL, offset - 1); \ @@ -863,8 +952,34 @@ static DEVICE_ATTR(pwm##offset##_freq, \ (offset == 1 ? S_IRUGO | S_IWUSR : S_IRUGO), \ 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); + S_IRUGO | S_IWUSR, show_pwm_temp_map, set_pwm_temp_map, \ + offset - 1); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_pwm, \ + S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm, \ + offset - 1, 0); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_pwm, \ + S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm, \ + offset - 1, 1); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_pwm, \ + S_IRUGO | S_IWUSR, show_auto_pwm, set_auto_pwm, \ + offset - 1, 2); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_pwm, \ + S_IRUGO, show_auto_pwm, NULL, offset - 1, 3); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp, \ + S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ + offset - 1, 1); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point1_temp_hyst, \ + S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ + offset - 1, 0); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point2_temp, \ + S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ + offset - 1, 2); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point3_temp, \ + S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ + offset - 1, 3); \ +static SENSOR_DEVICE_ATTR_2(pwm##offset##_auto_point4_temp, \ + S_IRUGO | S_IWUSR, show_auto_temp, set_auto_temp, \ + offset - 1, 4); show_pwm_offset(1); show_pwm_offset(2); @@ -1219,6 +1334,47 @@ static const struct attribute_group it87_group_pwm[3] = { { .attrs = it87_attributes_pwm[2] }, }; +static struct attribute *it87_attributes_autopwm[3][9+1] = { { + &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point4_pwm.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point1_temp_hyst.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point3_temp.dev_attr.attr, + &sensor_dev_attr_pwm1_auto_point4_temp.dev_attr.attr, + NULL +}, { + &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point3_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point4_pwm.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point1_temp_hyst.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point3_temp.dev_attr.attr, + &sensor_dev_attr_pwm2_auto_point4_temp.dev_attr.attr, + NULL +}, { + &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point3_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point4_pwm.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point1_temp_hyst.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point3_temp.dev_attr.attr, + &sensor_dev_attr_pwm3_auto_point4_temp.dev_attr.attr, + NULL +} }; + +static const struct attribute_group it87_group_autopwm[3] = { + { .attrs = it87_attributes_autopwm[0] }, + { .attrs = it87_attributes_autopwm[1] }, + { .attrs = it87_attributes_autopwm[2] }, +}; + static struct attribute *it87_attributes_fan_beep[] = { &sensor_dev_attr_fan1_beep.dev_attr.attr, &sensor_dev_attr_fan2_beep.dev_attr.attr, @@ -1382,6 +1538,9 @@ static void it87_remove_files(struct device *dev) if (sio_data->skip_pwm & (1 << 0)) continue; sysfs_remove_group(&dev->kobj, &it87_group_pwm[i]); + if (has_old_autopwm(data)) + sysfs_remove_group(&dev->kobj, + &it87_group_autopwm[i]); } if (!sio_data->skip_vid) sysfs_remove_group(&dev->kobj, &it87_group_vid); @@ -1491,6 +1650,13 @@ static int __devinit it87_probe(struct platform_device *pdev) &it87_group_pwm[i]); if (err) goto ERROR4; + + if (!has_old_autopwm(data)) + continue; + err = sysfs_create_group(&dev->kobj, + &it87_group_autopwm[i]); + if (err) + goto ERROR4; } } @@ -1624,6 +1790,7 @@ static void __devinit it87_init_device(struct platform_device *pdev) for (i = 0; i < 3; i++) { data->pwm_temp_map[i] = i; data->pwm_duty[i] = 0x7f; /* Full speed */ + data->auto_pwm[i][3] = 0x7f; /* Full speed, hard-coded */ } /* Some chips seem to have default value 0xff for all limit @@ -1703,6 +1870,17 @@ static void it87_update_pwm_ctrl(struct it87_data *data, int nr) data->pwm_temp_map[nr] = data->pwm_ctrl[nr] & 0x03; else /* Manual mode */ data->pwm_duty[nr] = data->pwm_ctrl[nr] & 0x7f; + + if (has_old_autopwm(data)) { + int i; + + for (i = 0; i < 5 ; i++) + data->auto_temp[nr][i] = it87_read_value(data, + IT87_REG_AUTO_TEMP(nr, i)); + for (i = 0; i < 3 ; i++) + data->auto_pwm[nr][i] = it87_read_value(data, + IT87_REG_AUTO_PWM(nr, i)); + } } static struct it87_data *it87_update_device(struct device *dev) |