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Diffstat (limited to 'drivers/hwmon/it87.c')
-rw-r--r--drivers/hwmon/it87.c176
1 files changed, 111 insertions, 65 deletions
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 0054d6f9cec9..0b204e4cf51c 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, \
@@ -1321,12 +1341,12 @@ static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
static ssize_t show_label(struct device *dev, struct device_attribute *attr,
char *buf)
{
- static const char *labels[] = {
+ static const char * const labels[] = {
"+5V",
"5VSB",
"Vbat",
};
- static const char *labels_it8721[] = {
+ static const char * const labels_it8721[] = {
"+3.3V",
"3VSB",
"Vbat",
@@ -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);
}
@@ -1793,7 +1815,7 @@ static int __devinit it87_probe(struct platform_device *pdev)
int err = 0, i;
int enable_pwm_interface;
int fan_beep_need_rw;
- static const char *names[] = {
+ static const char * const names[] = {
"it87",
"it8712",
"it8716",
@@ -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;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.