diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/hwmon/it87.c | 170 |
1 files changed, 108 insertions, 62 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c index 0054d6f9cec9..93a197bd315a 100644 --- a/drivers/hwmon/it87.c +++ b/drivers/hwmon/it87.c @@ -176,12 +176,16 @@ static bool fix_pwm_polarity; #define IT87_REG_ALARM2 0x02 #define IT87_REG_ALARM3 0x03 -/* The IT8718F and IT8720F have the VID value in a different register, in - Super-I/O configuration space. */ +/* + * The IT8718F and IT8720F have the VID value in a different register, in + * Super-I/O configuration space. + */ #define IT87_REG_VID 0x0a -/* The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b - for fan divisors. Later IT8712F revisions must use 16-bit tachometer - mode. */ +/* + * The IT8705F and IT8712F earlier than revision 0x08 use register 0x0b + * for fan divisors. Later IT8712F revisions must use 16-bit tachometer + * mode. + */ #define IT87_REG_FAN_DIV 0x0b #define IT87_REG_FAN_16BIT 0x0c @@ -227,8 +231,10 @@ struct it87_sio_data { u8 skip_pwm; }; -/* For each registered chip, we need to keep some data in memory. - The structure is dynamically allocated. */ +/* + * For each registered chip, we need to keep some data in memory. + * The structure is dynamically allocated. + */ struct it87_data { struct device *hwmon_dev; enum chips type; @@ -259,14 +265,16 @@ struct it87_data { u8 fan_main_ctrl; /* Register value */ u8 fan_ctl; /* Register value */ - /* The following 3 arrays correspond to the same registers up to + /* + * The following 3 arrays correspond to the same registers up to * the IT8720F. The meaning of bits 6-0 depends on the value of bit * 7, and we want to preserve settings on mode changes, so we have * to track all values separately. * Starting with the IT8721F, the manual PWM duty cycles are stored * in separate registers (8-bit values), so the separate tracking * is no longer needed, but it is still done to keep the driver - * simple. */ + * simple. + */ u8 pwm_ctrl[3]; /* Register value */ u8 pwm_duty[3]; /* Manual PWM value set by user */ u8 pwm_temp_map[3]; /* PWM to temp. chan. mapping (bits 1-0) */ @@ -388,9 +396,11 @@ static const unsigned int pwm_freq[8] = { static inline int has_16bit_fans(const struct it87_data *data) { - /* IT8705F Datasheet 0.4.1, 3h == Version G. - IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J. - These are the first revisions with 16bit tachometer support. */ + /* + * IT8705F Datasheet 0.4.1, 3h == Version G. + * IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J. + * These are the first revisions with 16-bit tachometer support. + */ return (data->type == it87 && data->revision >= 0x03) || (data->type == it8712 && data->revision >= 0x08) || data->type == it8716 @@ -402,9 +412,11 @@ static inline int has_16bit_fans(const struct it87_data *data) 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. */ + /* + * 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); } @@ -606,10 +618,8 @@ static ssize_t show_sensor(struct device *dev, struct device_attribute *attr, { struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); int nr = sensor_attr->index; - struct it87_data *data = it87_update_device(dev); - u8 reg = data->sensor; /* In case the value is updated while - we use it */ + u8 reg = data->sensor; /* In case value is updated while used */ if (reg & (1 << nr)) return sprintf(buf, "3\n"); /* thermal diode */ @@ -894,8 +904,10 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, mutex_lock(&data->update_lock); if (has_newer_autopwm(data)) { - /* If we are in automatic mode, the PWM duty cycle register - * is read-only so we can't write the value */ + /* + * If we are in automatic mode, the PWM duty cycle register + * is read-only so we can't write the value. + */ if (data->pwm_ctrl[nr] & 0x80) { mutex_unlock(&data->update_lock); return -EBUSY; @@ -905,8 +917,10 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, data->pwm_duty[nr]); } else { data->pwm_duty[nr] = pwm_to_reg(data, val); - /* If we are in manual mode, write the duty cycle immediately; - * otherwise, just store it for later use. */ + /* + * If we are in manual mode, write the duty cycle immediately; + * otherwise, just store it for later use. + */ if (!(data->pwm_ctrl[nr] & 0x80)) { data->pwm_ctrl[nr] = data->pwm_duty[nr]; it87_write_value(data, IT87_REG_PWM(nr), @@ -965,8 +979,10 @@ 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. */ + /* + * 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; @@ -991,8 +1007,10 @@ static ssize_t set_pwm_temp_map(struct device *dev, 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 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]); @@ -1162,9 +1180,11 @@ static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr, return count; } -/* We want to use the same sysfs file names as 8-bit fans, but we need - different variable names, so we have to use SENSOR_ATTR instead of - SENSOR_DEVICE_ATTR. */ +/* + * We want to use the same sysfs file names as 8-bit fans, but we need + * different variable names, so we have to use SENSOR_ATTR instead of + * SENSOR_DEVICE_ATTR. + */ #define show_fan16_offset(offset) \ static struct sensor_device_attribute sensor_dev_attr_fan##offset##_input16 \ = SENSOR_ATTR(fan##offset##_input, S_IRUGO, \ @@ -1736,12 +1756,14 @@ static int __init it87_find(unsigned short *address, if (board_vendor && board_name) { if (strcmp(board_vendor, "nVIDIA") == 0 && strcmp(board_name, "FN68PT") == 0) { - /* On the Shuttle SN68PT, FAN_CTL2 is apparently not - connected to a fan, but to something else. One user - has reported instant system power-off when changing - the PWM2 duty cycle, so we disable it. - I use the board name string as the trigger in case - the same board is ever used in other systems. */ + /* + * On the Shuttle SN68PT, FAN_CTL2 is apparently not + * connected to a fan, but to something else. One user + * has reported instant system power-off when changing + * the PWM2 duty cycle, so we disable it. + * I use the board name string as the trigger in case + * the same board is ever used in other systems. + */ pr_info("Disabling pwm2 due to hardware constraints\n"); sio_data->skip_pwm = (1 << 1); } @@ -1879,9 +1901,11 @@ static int __devinit it87_probe(struct platform_device *pdev) if (!fan_beep_need_rw) continue; - /* As we have a single beep enable bit for all fans, + /* + * As we have a single beep enable bit for all fans, * only the first enabled fan has a writable attribute - * for it. */ + * for it. + */ if (sysfs_chmod_file(&dev->kobj, it87_attributes_fan_beep[i], S_IRUGO | S_IWUSR)) @@ -1961,18 +1985,22 @@ static int __devexit it87_remove(struct platform_device *pdev) return 0; } -/* Must be called with data->update_lock held, except during initialization. - We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, - would slow down the IT87 access and should not be necessary. */ +/* + * Must be called with data->update_lock held, except during initialization. + * We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, + * would slow down the IT87 access and should not be necessary. + */ static int it87_read_value(struct it87_data *data, u8 reg) { outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET); return inb_p(data->addr + IT87_DATA_REG_OFFSET); } -/* Must be called with data->update_lock held, except during initialization. - We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, - would slow down the IT87 access and should not be necessary. */ +/* + * Must be called with data->update_lock held, except during initialization. + * We ignore the IT87 BUSY flag at this moment - it could lead to deadlocks, + * would slow down the IT87 access and should not be necessary. + */ static void it87_write_value(struct it87_data *data, u8 reg, u8 value) { outb_p(reg, data->addr + IT87_ADDR_REG_OFFSET); @@ -1983,15 +2011,19 @@ static void it87_write_value(struct it87_data *data, u8 reg, u8 value) static int __devinit it87_check_pwm(struct device *dev) { struct it87_data *data = dev_get_drvdata(dev); - /* Some BIOSes fail to correctly configure the IT87 fans. All fans off + /* + * Some BIOSes fail to correctly configure the IT87 fans. All fans off * and polarity set to active low is sign that this is the case so we - * disable pwm control to protect the user. */ + * disable pwm control to protect the user. + */ int tmp = it87_read_value(data, IT87_REG_FAN_CTL); if ((tmp & 0x87) == 0) { if (fix_pwm_polarity) { - /* The user asks us to attempt a chip reconfiguration. + /* + * The user asks us to attempt a chip reconfiguration. * This means switching to active high polarity and - * inverting all fan speed values. */ + * inverting all fan speed values. + */ int i; u8 pwm[3]; @@ -1999,10 +2031,12 @@ static int __devinit it87_check_pwm(struct device *dev) pwm[i] = it87_read_value(data, IT87_REG_PWM(i)); - /* If any fan is in automatic pwm mode, the polarity + /* + * If any fan is in automatic pwm mode, the polarity * might be correct, as suspicious as it seems, so we * better don't change anything (but still disable the - * PWM interface). */ + * PWM interface). + */ if (!((pwm[0] | pwm[1] | pwm[2]) & 0x80)) { dev_info(dev, "Reconfiguring PWM to " "active high polarity\n"); @@ -2038,7 +2072,8 @@ static void __devinit it87_init_device(struct platform_device *pdev) int tmp, i; u8 mask; - /* For each PWM channel: + /* + * For each PWM channel: * - If it is in automatic mode, setting to manual mode should set * the fan to full speed by default. * - If it is in manual mode, we need a mapping to temperature @@ -2048,18 +2083,21 @@ static void __devinit it87_init_device(struct platform_device *pdev) * prior to switching to a different mode. * Note that this is no longer needed for the IT8721F and later, as * these have separate registers for the temperature mapping and the - * manual duty cycle. */ + * manual duty cycle. + */ 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 + /* + * Some chips seem to have default value 0xff for all limit * registers. For low voltage limits it makes no sense and triggers * alarms, so change to 0 instead. For high temperature limits, it * means -1 degree C, which surprisingly doesn't trigger an alarm, - * but is still confusing, so change to 127 degrees C. */ + * but is still confusing, so change to 127 degrees C. + */ for (i = 0; i < 8; i++) { tmp = it87_read_value(data, IT87_REG_VIN_MIN(i)); if (tmp == 0xff) @@ -2071,10 +2109,12 @@ static void __devinit it87_init_device(struct platform_device *pdev) it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127); } - /* Temperature channels are not forcibly enabled, as they can be + /* + * Temperature channels are not forcibly enabled, as they can be * set to two different sensor types and we can't guess which one * is correct for a given system. These channels can be enabled at - * run-time through the temp{1-3}_type sysfs accessors if needed. */ + * run-time through the temp{1-3}_type sysfs accessors if needed. + */ /* Check if voltage monitors are reset manually or by some reason */ tmp = it87_read_value(data, IT87_REG_VIN_ENABLE); @@ -2157,8 +2197,10 @@ static struct it87_data *it87_update_device(struct device *dev) if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || !data->valid) { if (update_vbat) { - /* Cleared after each update, so reenable. Value - returned by this read will be previous value */ + /* + * Cleared after each update, so reenable. Value + * returned by this read will be previous value + */ it87_write_value(data, IT87_REG_CONFIG, it87_read_value(data, IT87_REG_CONFIG) | 0x40); } @@ -2220,13 +2262,17 @@ static struct it87_data *it87_update_device(struct device *dev) it87_update_pwm_ctrl(data, i); data->sensor = it87_read_value(data, IT87_REG_TEMP_ENABLE); - /* The 8705 does not have VID capability. - The 8718 and later don't use IT87_REG_VID for the - same purpose. */ + /* + * The IT8705F does not have VID capability. + * The IT8718F and later don't use IT87_REG_VID for the + * same purpose. + */ if (data->type == it8712 || data->type == it8716) { data->vid = it87_read_value(data, IT87_REG_VID); - /* The older IT8712F revisions had only 5 VID pins, - but we assume it is always safe to read 6 bits. */ + /* + * The older IT8712F revisions had only 5 VID pins, + * but we assume it is always safe to read 6 bits. + */ data->vid &= 0x3f; } data->last_updated = jiffies; |