From: Jerome Tollet <jerome.tollet@gmail.com>
To: Jean Delvare <jdelvare@suse.de>, Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org, Benoit Masson <yahoo@perenite.com>,
Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
Randy Dunlap <rdunlap@infradead.org>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
Jerome Tollet <jerome.tollet@gmail.com>
Subject: [PATCH v5 1/4] hwmon: it87: describe per-chip temperature resources
Date: Sat, 29 Aug 2026 19:05:42 +0200 [thread overview]
Message-ID: <20260829170545.33401-2-jerome.tollet@gmail.com> (raw)
In-Reply-To: <20260829170545.33401-1-jerome.tollet@gmail.com>
From: "benoit.masson" <yahoo@perenite.com>
Add per-chip temp limit/offset/map counts and wire the driver
to use them.
This keeps existing chips on the previous defaults while allowing newer
chips to advertise larger resources.
Signed-off-by: benoit.masson <yahoo@perenite.com>
Signed-off-by: Jerome Tollet <jerome.tollet@gmail.com>
---
drivers/hwmon/it87.c | 151 ++++++++++++++++++++++++++++++++-----------
1 file changed, 114 insertions(+), 37 deletions(-)
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 87edb1b60..1c77f6c97 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -247,7 +247,7 @@ static const u8 IT87_REG_FAN[] = { 0x0d, 0x0e, 0x0f, 0x80, 0x82, 0x4c };
static const u8 IT87_REG_FAN_MIN[] = { 0x10, 0x11, 0x12, 0x84, 0x86, 0x4e };
static const u8 IT87_REG_FANX[] = { 0x18, 0x19, 0x1a, 0x81, 0x83, 0x4d };
static const u8 IT87_REG_FANX_MIN[] = { 0x1b, 0x1c, 0x1d, 0x85, 0x87, 0x4f };
-static const u8 IT87_REG_TEMP_OFFSET[] = { 0x56, 0x57, 0x59 };
+static const u8 IT87_REG_TEMP_OFFSET[] = { 0x56, 0x57, 0x59, 0x5a, 0x90, 0x91 };
#define IT87_REG_FAN_MAIN_CTRL 0x13
#define IT87_REG_FAN_CTL 0x14
@@ -282,7 +282,6 @@ static const u8 IT87_REG_AUTO_BASE[] = { 0x60, 0x68, 0x70, 0x78, 0xa0, 0xa8 };
#define NUM_VIN_LIMIT 8
#define NUM_TEMP 6
#define NUM_TEMP_OFFSET ARRAY_SIZE(IT87_REG_TEMP_OFFSET)
-#define NUM_TEMP_LIMIT 3
#define NUM_FAN ARRAY_SIZE(IT87_REG_FAN)
#define NUM_FAN_DIV 3
#define NUM_PWM ARRAY_SIZE(IT87_REG_PWM)
@@ -292,6 +291,9 @@ struct it87_devices {
const char *name;
const char * const model;
u32 features;
+ u8 num_temp_limit;
+ u8 num_temp_offset;
+ u8 num_temp_map;
u8 peci_mask;
u8 old_peci_mask;
u8 smbus_bitmap; /* SMBus enable bits in extra config register */
@@ -302,7 +304,6 @@ struct it87_devices {
#define FEAT_NEWER_AUTOPWM BIT(1)
#define FEAT_OLD_AUTOPWM BIT(2)
#define FEAT_16BIT_FANS BIT(3)
-#define FEAT_TEMP_OFFSET BIT(4)
#define FEAT_TEMP_PECI BIT(5)
#define FEAT_TEMP_OLD_PECI BIT(6)
#define FEAT_FAN16_CONFIG BIT(7) /* Need to enable 16-bit fans */
@@ -335,43 +336,61 @@ static const struct it87_devices it87_devices[] = {
.model = "IT87F",
.features = FEAT_OLD_AUTOPWM | FEAT_FANCTL_ONOFF,
/* may need to overwrite */
+ .num_temp_limit = 3,
+ .num_temp_offset = 0,
+ .num_temp_map = 3,
},
[it8712] = {
.name = "it8712",
.model = "IT8712F",
.features = FEAT_OLD_AUTOPWM | FEAT_VID | FEAT_FANCTL_ONOFF,
/* may need to overwrite */
+ .num_temp_limit = 3,
+ .num_temp_offset = 0,
+ .num_temp_map = 3,
},
[it8716] = {
.name = "it8716",
.model = "IT8716F",
- .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET | FEAT_VID
+ .features = FEAT_16BIT_FANS | FEAT_VID
| FEAT_FAN16_CONFIG | FEAT_FIVE_FANS | FEAT_PWM_FREQ2
| FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
},
[it8718] = {
.name = "it8718",
.model = "IT8718F",
- .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET | FEAT_VID
+ .features = FEAT_16BIT_FANS | FEAT_VID
| FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.old_peci_mask = 0x4,
},
[it8720] = {
.name = "it8720",
.model = "IT8720F",
- .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET | FEAT_VID
+ .features = FEAT_16BIT_FANS | FEAT_VID
| FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.old_peci_mask = 0x4,
},
[it8721] = {
.name = "it8721",
.model = "IT8721F",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
+ | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
| FEAT_FAN16_CONFIG | FEAT_FIVE_FANS | FEAT_IN7_INTERNAL
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x05,
.old_peci_mask = 0x02, /* Actually reports PCH */
},
@@ -379,18 +398,24 @@ static const struct it87_devices it87_devices[] = {
.name = "it8728",
.model = "IT8728F",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS
+ | FEAT_TEMP_PECI | FEAT_FIVE_FANS
| FEAT_IN7_INTERNAL | FEAT_PWM_FREQ2
| FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 6,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8732] = {
.name = "it8732",
.model = "IT8732F",
.features = FEAT_NEWER_AUTOPWM | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
+ | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
| FEAT_10_9MV_ADC | FEAT_IN7_INTERNAL | FEAT_FOUR_FANS
| FEAT_FOUR_PWM | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
.old_peci_mask = 0x02, /* Actually reports PCH */
},
@@ -398,73 +423,97 @@ static const struct it87_devices it87_devices[] = {
.name = "it8771",
.model = "IT8771E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
+ | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF,
/* PECI: guesswork */
/* 12mV ADC (OHM) */
/* 16 bit fans (OHM) */
/* three fans, always 16 bit (guesswork) */
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8772] = {
.name = "it8772",
.model = "IT8772E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
+ | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF,
/* PECI (coreboot) */
/* 12mV ADC (HWSensors4, OHM) */
/* 16 bit fans (HWSensors4, OHM) */
/* three fans, always 16 bit (datasheet) */
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8781] = {
.name = "it8781",
.model = "IT8781F",
- .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
+ .features = FEAT_16BIT_FANS
| FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_PWM_FREQ2
| FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.old_peci_mask = 0x4,
},
[it8782] = {
.name = "it8782",
.model = "IT8782F",
- .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
+ .features = FEAT_16BIT_FANS
| FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_PWM_FREQ2
| FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.old_peci_mask = 0x4,
},
[it8783] = {
.name = "it8783",
.model = "IT8783E/F",
- .features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
+ .features = FEAT_16BIT_FANS
| FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG | FEAT_PWM_FREQ2
| FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.old_peci_mask = 0x4,
},
[it8786] = {
.name = "it8786",
.model = "IT8786E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
+ | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8790] = {
.name = "it8790",
.model = "IT8790E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
+ | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
| FEAT_PWM_FREQ2 | FEAT_FANCTL_ONOFF | FEAT_NOCONF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8792] = {
.name = "it8792",
.model = "IT8792E/IT8795E",
.features = FEAT_NEWER_AUTOPWM | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
+ | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
| FEAT_10_9MV_ADC | FEAT_IN7_INTERNAL | FEAT_FANCTL_ONOFF
| FEAT_NOCONF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
.old_peci_mask = 0x02, /* Actually reports PCH */
},
@@ -472,54 +521,72 @@ static const struct it87_devices it87_devices[] = {
.name = "it8603",
.model = "IT8603E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
+ | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL
| FEAT_AVCC3 | FEAT_PWM_FREQ2,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 4,
.peci_mask = 0x07,
},
[it8620] = {
.name = "it8620",
.model = "IT8620E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_SIX_FANS
+ | FEAT_TEMP_PECI | FEAT_SIX_FANS
| FEAT_IN7_INTERNAL | FEAT_SIX_PWM | FEAT_PWM_FREQ2
| FEAT_SIX_TEMP | FEAT_VIN3_5V | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8622] = {
.name = "it8622",
.model = "IT8622E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS
+ | FEAT_TEMP_PECI | FEAT_FIVE_FANS
| FEAT_FIVE_PWM | FEAT_IN7_INTERNAL | FEAT_PWM_FREQ2
| FEAT_AVCC3 | FEAT_VIN3_5V | FEAT_FOUR_TEMP,
- .peci_mask = 0x07,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 4,
+ .peci_mask = 0x0f,
.smbus_bitmap = BIT(1) | BIT(2),
},
[it8628] = {
.name = "it8628",
.model = "IT8628E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_SIX_FANS
+ | FEAT_TEMP_PECI | FEAT_SIX_FANS
| FEAT_IN7_INTERNAL | FEAT_SIX_PWM | FEAT_PWM_FREQ2
| FEAT_SIX_TEMP | FEAT_VIN3_5V | FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 6,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
},
[it8689] = {
.name = "it8689",
.model = "IT8689E",
.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_SIX_FANS | FEAT_IN7_INTERNAL
+ | FEAT_SIX_FANS | FEAT_IN7_INTERNAL
| FEAT_SIX_PWM | FEAT_PWM_FREQ2 | FEAT_SIX_TEMP | FEAT_AVCC3
| FEAT_FANCTL_ONOFF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.smbus_bitmap = BIT(1) | BIT(2),
},
[it87952] = {
.name = "it87952",
.model = "IT87952E",
.features = FEAT_NEWER_AUTOPWM | FEAT_16BIT_FANS
- | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
+ | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
| FEAT_10_9MV_ADC | FEAT_IN7_INTERNAL | FEAT_FANCTL_ONOFF
| FEAT_NOCONF,
+ .num_temp_limit = 3,
+ .num_temp_offset = 3,
+ .num_temp_map = 3,
.peci_mask = 0x07,
.old_peci_mask = 0x02, /* Actually reports PCH */
},
@@ -530,7 +597,6 @@ static const struct it87_devices it87_devices[] = {
#define has_10_9mv_adc(data) ((data)->features & FEAT_10_9MV_ADC)
#define has_newer_autopwm(data) ((data)->features & FEAT_NEWER_AUTOPWM)
#define has_old_autopwm(data) ((data)->features & FEAT_OLD_AUTOPWM)
-#define has_temp_offset(data) ((data)->features & FEAT_TEMP_OFFSET)
#define has_temp_peci(data, nr) (((data)->features & FEAT_TEMP_PECI) && \
((data)->peci_mask & BIT(nr)))
#define has_temp_old_peci(data, nr) \
@@ -589,6 +655,9 @@ struct it87_data {
int sioaddr;
enum chips type;
u32 features;
+ u8 num_temp_limit;
+ u8 num_temp_offset;
+ u8 num_temp_map;
u8 peci_mask;
u8 old_peci_mask;
@@ -937,12 +1006,12 @@ static struct it87_data *it87_update_device(struct device *dev)
data->temp[i][0] =
it87_read_value(data, IT87_REG_TEMP(i));
- if (has_temp_offset(data) && i < NUM_TEMP_OFFSET)
+ if (i < data->num_temp_offset)
data->temp[i][3] =
it87_read_value(data,
IT87_REG_TEMP_OFFSET[i]);
- if (i >= NUM_TEMP_LIMIT)
+ if (i >= data->num_temp_limit)
continue;
data->temp[i][1] =
@@ -1693,16 +1762,18 @@ static ssize_t show_pwm_temp_map(struct device *dev,
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
struct it87_data *data = it87_update_device(dev);
int nr = sensor_attr->index;
+ u8 num_map;
int map;
if (IS_ERR(data))
return PTR_ERR(data);
+ num_map = data->num_temp_map;
map = data->pwm_temp_map[nr];
- if (map >= 3)
+ if (map >= num_map)
map = 0; /* Should never happen */
- if (nr >= 3) /* pwm channels 3..6 map to temp4..6 */
- map += 3;
+ if (nr >= num_map) /* pwm channels 3..6 map to temp4..6 */
+ map += num_map;
return sprintf(buf, "%d\n", (int)BIT(map));
}
@@ -1714,6 +1785,7 @@ static ssize_t set_pwm_temp_map(struct device *dev,
struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
struct it87_data *data = dev_get_drvdata(dev);
int nr = sensor_attr->index;
+ u8 num_map = data->num_temp_map;
long val;
int err;
u8 reg;
@@ -1721,8 +1793,8 @@ static ssize_t set_pwm_temp_map(struct device *dev,
if (kstrtol(buf, 10, &val) < 0)
return -EINVAL;
- if (nr >= 3)
- val -= 3;
+ if (nr >= num_map)
+ val -= num_map;
switch (val) {
case BIT(0):
@@ -2376,7 +2448,7 @@ static umode_t it87_temp_is_visible(struct kobject *kobj,
return attr->mode;
}
- if (a == 5 && !has_temp_offset(data))
+ if (a == 5 && i >= data->num_temp_offset)
return 0;
if (a == 6 && !data->has_beep)
@@ -3268,7 +3340,7 @@ static void it87_check_limit_regs(struct it87_data *data)
if (reg == 0xff)
it87_write_value(data, IT87_REG_VIN_MIN(i), 0);
}
- for (i = 0; i < NUM_TEMP_LIMIT; i++) {
+ for (i = 0; i < data->num_temp_limit; i++) {
reg = it87_read_value(data, IT87_REG_TEMP_HIGH(i));
if (reg == 0xff)
it87_write_value(data, IT87_REG_TEMP_HIGH(i), 127);
@@ -3461,6 +3533,7 @@ static int it87_probe(struct platform_device *pdev)
struct resource *res;
struct device *dev = &pdev->dev;
struct it87_sio_data *sio_data = dev_get_platdata(dev);
+ const struct it87_devices *chip;
int enable_pwm_interface;
struct device *hwmon_dev;
int err;
@@ -3483,9 +3556,13 @@ static int it87_probe(struct platform_device *pdev)
data->type = sio_data->type;
data->smbus_bitmap = sio_data->smbus_bitmap;
data->ec_special_config = sio_data->ec_special_config;
- data->features = it87_devices[sio_data->type].features;
- data->peci_mask = it87_devices[sio_data->type].peci_mask;
- data->old_peci_mask = it87_devices[sio_data->type].old_peci_mask;
+ chip = &it87_devices[sio_data->type];
+ data->features = chip->features;
+ data->peci_mask = chip->peci_mask;
+ data->old_peci_mask = chip->old_peci_mask;
+ data->num_temp_limit = chip->num_temp_limit;
+ data->num_temp_offset = chip->num_temp_offset;
+ data->num_temp_map = chip->num_temp_map;
/*
* IT8705F Datasheet 0.4.1, 3h == Version G.
* IT8712F Datasheet 0.9.1, section 8.3.5 indicates 8h == Version J.
--
2.55.0
next prev parent reply other threads:[~2026-08-29 17:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-29 17:05 [PATCH v5 0/4] hwmon: it87: add IT8613E support Jerome Tollet
2026-08-29 17:05 ` Jerome Tollet [this message]
2026-08-29 17:05 ` [PATCH v5 2/4] hwmon: it87: prepare for extended PWM temp maps Jerome Tollet
2026-08-29 17:05 ` [PATCH v5 3/4] hwmon: it87: expose additional temperature limits Jerome Tollet
2026-08-29 17:05 ` [PATCH v5 4/4] hwmon: it87: add IT8613E support Jerome Tollet
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