| Message ID | 20240414174743.8575-1-W_Armin@gmx.de (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [v4] ACPI: fan: Add hwmon support | expand |
On Sun, 14 Apr 2024, Armin Wolf wrote: > Currently, the driver does only support a custom sysfs > to allow userspace to read the fan speed. > Add support for the standard hwmon interface so users > can read the fan speed with standard tools like "sensors". > > Compile-tested only. > > Signed-off-by: Armin Wolf <W_Armin@gmx.de> > --- > Changes since v3: > - drop fault attrs > - rework initialization > > Changes since v2: > - add support for fanX_target and power attrs > > Changes since v1: > - fix undefined reference error > - fix fan speed validation > - coding style fixes > - clarify that the changes are compile-tested only > - add hwmon maintainers to cc list > > The changes will be tested by Mikael Lund Jepsen from Danelec and > should be merged only after those tests. > --- > drivers/acpi/Makefile | 1 + > drivers/acpi/fan.h | 9 +++ > drivers/acpi/fan_core.c | 4 + > drivers/acpi/fan_hwmon.c | 170 +++++++++++++++++++++++++++++++++++++++ > 4 files changed, 184 insertions(+) > create mode 100644 drivers/acpi/fan_hwmon.c > > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > index 39ea5cfa8326..61ca4afe83dc 100644 > --- a/drivers/acpi/Makefile > +++ b/drivers/acpi/Makefile > @@ -77,6 +77,7 @@ obj-$(CONFIG_ACPI_TINY_POWER_BUTTON) += tiny-power-button.o > obj-$(CONFIG_ACPI_FAN) += fan.o > fan-objs := fan_core.o > fan-objs += fan_attr.o > +fan-$(CONFIG_HWMON) += fan_hwmon.o > > obj-$(CONFIG_ACPI_VIDEO) += video.o > obj-$(CONFIG_ACPI_TAD) += acpi_tad.o > diff --git a/drivers/acpi/fan.h b/drivers/acpi/fan.h > index f89d19c922dc..db25a3898af7 100644 > --- a/drivers/acpi/fan.h > +++ b/drivers/acpi/fan.h > @@ -10,6 +10,8 @@ > #ifndef _ACPI_FAN_H_ > #define _ACPI_FAN_H_ > > +#include <linux/kconfig.h> > + > #define ACPI_FAN_DEVICE_IDS \ > {"INT3404", }, /* Fan */ \ > {"INTC1044", }, /* Fan for Tiger Lake generation */ \ > @@ -57,4 +59,11 @@ struct acpi_fan { > int acpi_fan_get_fst(struct acpi_device *device, struct acpi_fan_fst *fst); > int acpi_fan_create_attributes(struct acpi_device *device); > void acpi_fan_delete_attributes(struct acpi_device *device); > + > +#if IS_REACHABLE(CONFIG_HWMON) > +int devm_acpi_fan_create_hwmon(struct acpi_device *device); > +#else > +static inline int devm_acpi_fan_create_hwmon(struct acpi_device *device) { return 0; }; > +#endif > + > #endif > diff --git a/drivers/acpi/fan_core.c b/drivers/acpi/fan_core.c > index ff72e4ef8738..7cea4495f19b 100644 > --- a/drivers/acpi/fan_core.c > +++ b/drivers/acpi/fan_core.c > @@ -336,6 +336,10 @@ static int acpi_fan_probe(struct platform_device *pdev) > if (result) > return result; > > + result = devm_acpi_fan_create_hwmon(device); > + if (result) > + return result; > + > result = acpi_fan_create_attributes(device); > if (result) > return result; > diff --git a/drivers/acpi/fan_hwmon.c b/drivers/acpi/fan_hwmon.c > new file mode 100644 > index 000000000000..0ae9017bdbae > --- /dev/null > +++ b/drivers/acpi/fan_hwmon.c > @@ -0,0 +1,170 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * fan_hwmon.c - hwmon interface for the ACPI Fan driver > + * > + * Copyright (C) 2024 Armin Wolf <W_Armin@gmx.de> > + */ > + > +#include <linux/acpi.h> > +#include <linux/hwmon.h> > +#include <linux/limits.h> > +#include <linux/units.h> > + > +#include "fan.h" > + > +/* Returned when the ACPI fan does not support speed reporting */ > +#define FAN_SPEED_UNAVAILABLE 0xffffffff > +#define FAN_POWER_UNAVAILABLE 0xffffffff > + > +static struct acpi_fan_fps *acpi_fan_get_current_fps(struct acpi_fan *fan, u64 control) > +{ > + int i; > + > + for (i = 0; i < fan->fps_count; i++) { > + if (fan->fps[i].control == control) > + return &fan->fps[i]; > + } > + > + return NULL; > +} > + > +static umode_t acpi_fan_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, > + int channel) > +{ > + const struct acpi_fan *fan = drvdata; > + int i; > + > + switch (type) { > + case hwmon_fan: > + switch (attr) { > + case hwmon_fan_input: > + return 0444; > + case hwmon_fan_target: > + /* When in fine grain control mode, not every fan control value > + * has an associated fan performance state. > + */ > + if (fan->fif.fine_grain_ctrl) > + return 0; > + > + return 0444; > + default: > + break; > + } > + break; > + case hwmon_power: > + switch (attr) { > + case hwmon_power_input: > + /* When in fine grain control mode, not every fan control value > + * has an associated fan performance state. > + */ > + if (fan->fif.fine_grain_ctrl) > + return 0; > + > + /* When all fan performance states contain no valid power data, > + * when the associated atttribute should not be created. attribute
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 39ea5cfa8326..61ca4afe83dc 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_ACPI_TINY_POWER_BUTTON) += tiny-power-button.o obj-$(CONFIG_ACPI_FAN) += fan.o fan-objs := fan_core.o fan-objs += fan_attr.o +fan-$(CONFIG_HWMON) += fan_hwmon.o obj-$(CONFIG_ACPI_VIDEO) += video.o obj-$(CONFIG_ACPI_TAD) += acpi_tad.o diff --git a/drivers/acpi/fan.h b/drivers/acpi/fan.h index f89d19c922dc..db25a3898af7 100644 --- a/drivers/acpi/fan.h +++ b/drivers/acpi/fan.h @@ -10,6 +10,8 @@ #ifndef _ACPI_FAN_H_ #define _ACPI_FAN_H_ +#include <linux/kconfig.h> + #define ACPI_FAN_DEVICE_IDS \ {"INT3404", }, /* Fan */ \ {"INTC1044", }, /* Fan for Tiger Lake generation */ \ @@ -57,4 +59,11 @@ struct acpi_fan { int acpi_fan_get_fst(struct acpi_device *device, struct acpi_fan_fst *fst); int acpi_fan_create_attributes(struct acpi_device *device); void acpi_fan_delete_attributes(struct acpi_device *device); + +#if IS_REACHABLE(CONFIG_HWMON) +int devm_acpi_fan_create_hwmon(struct acpi_device *device); +#else +static inline int devm_acpi_fan_create_hwmon(struct acpi_device *device) { return 0; }; +#endif + #endif diff --git a/drivers/acpi/fan_core.c b/drivers/acpi/fan_core.c index ff72e4ef8738..7cea4495f19b 100644 --- a/drivers/acpi/fan_core.c +++ b/drivers/acpi/fan_core.c @@ -336,6 +336,10 @@ static int acpi_fan_probe(struct platform_device *pdev) if (result) return result; + result = devm_acpi_fan_create_hwmon(device); + if (result) + return result; + result = acpi_fan_create_attributes(device); if (result) return result; diff --git a/drivers/acpi/fan_hwmon.c b/drivers/acpi/fan_hwmon.c new file mode 100644 index 000000000000..0ae9017bdbae --- /dev/null +++ b/drivers/acpi/fan_hwmon.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * fan_hwmon.c - hwmon interface for the ACPI Fan driver + * + * Copyright (C) 2024 Armin Wolf <W_Armin@gmx.de> + */ + +#include <linux/acpi.h> +#include <linux/hwmon.h> +#include <linux/limits.h> +#include <linux/units.h> + +#include "fan.h" + +/* Returned when the ACPI fan does not support speed reporting */ +#define FAN_SPEED_UNAVAILABLE 0xffffffff +#define FAN_POWER_UNAVAILABLE 0xffffffff + +static struct acpi_fan_fps *acpi_fan_get_current_fps(struct acpi_fan *fan, u64 control) +{ + int i; + + for (i = 0; i < fan->fps_count; i++) { + if (fan->fps[i].control == control) + return &fan->fps[i]; + } + + return NULL; +} + +static umode_t acpi_fan_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, + int channel) +{ + const struct acpi_fan *fan = drvdata; + int i; + + switch (type) { + case hwmon_fan: + switch (attr) { + case hwmon_fan_input: + return 0444; + case hwmon_fan_target: + /* When in fine grain control mode, not every fan control value + * has an associated fan performance state. + */ + if (fan->fif.fine_grain_ctrl) + return 0; + + return 0444; + default: + break; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + /* When in fine grain control mode, not every fan control value + * has an associated fan performance state. + */ + if (fan->fif.fine_grain_ctrl) + return 0; + + /* When all fan performance states contain no valid power data, + * when the associated atttribute should not be created. + */ + for (i = 0; i < fan->fps_count; i++) { + if (fan->fps[i].power != FAN_POWER_UNAVAILABLE) + return 0444; + } + + return 0; + default: + break; + } + break; + default: + break; + } + + return 0; +} + +static int acpi_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, + long *val) +{ + struct acpi_device *adev = to_acpi_device(dev->parent); + struct acpi_fan *fan = dev_get_drvdata(dev); + struct acpi_fan_fps *fps; + struct acpi_fan_fst fst; + int ret; + + ret = acpi_fan_get_fst(adev, &fst); + if (ret < 0) + return ret; + + switch (type) { + case hwmon_fan: + switch (attr) { + case hwmon_fan_input: + if (fst.speed == FAN_SPEED_UNAVAILABLE) + return -ENODATA; + + if (fst.speed > LONG_MAX) + return -EOVERFLOW; + + *val = fst.speed; + return 0; + case hwmon_fan_target: + fps = acpi_fan_get_current_fps(fan, fst.control); + if (!fps) + return -ENODATA; + + *val = fps->speed; + return 0; + default: + break; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + fps = acpi_fan_get_current_fps(fan, fst.control); + if (!fps) + return -ENODATA; + + if (fps->power == FAN_POWER_UNAVAILABLE) + return -ENODATA; + + if (fps->power > LONG_MAX / MICROWATT_PER_MILLIWATT) + return -EOVERFLOW; + + *val = fps->power * MICROWATT_PER_MILLIWATT; + return 0; + default: + break; + } + break; + default: + break; + } + + return -EOPNOTSUPP; +} + +static const struct hwmon_ops acpi_fan_ops = { + .is_visible = acpi_fan_is_visible, + .read = acpi_fan_read, +}; + +static const struct hwmon_channel_info * const acpi_fan_info[] = { + HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET), + HWMON_CHANNEL_INFO(power, HWMON_P_INPUT), + NULL +}; + +static const struct hwmon_chip_info acpi_fan_chip_info = { + .ops = &acpi_fan_ops, + .info = acpi_fan_info, +}; + +int devm_acpi_fan_create_hwmon(struct acpi_device *device) +{ + struct acpi_fan *fan = acpi_driver_data(device); + struct device *hdev; + + hdev = devm_hwmon_device_register_with_info(&device->dev, "acpi_fan", fan, + &acpi_fan_chip_info, NULL); + + return PTR_ERR_OR_ZERO(hdev); +}
Currently, the driver does only support a custom sysfs to allow userspace to read the fan speed. Add support for the standard hwmon interface so users can read the fan speed with standard tools like "sensors". Compile-tested only. Signed-off-by: Armin Wolf <W_Armin@gmx.de> --- Changes since v3: - drop fault attrs - rework initialization Changes since v2: - add support for fanX_target and power attrs Changes since v1: - fix undefined reference error - fix fan speed validation - coding style fixes - clarify that the changes are compile-tested only - add hwmon maintainers to cc list The changes will be tested by Mikael Lund Jepsen from Danelec and should be merged only after those tests. --- drivers/acpi/Makefile | 1 + drivers/acpi/fan.h | 9 +++ drivers/acpi/fan_core.c | 4 + drivers/acpi/fan_hwmon.c | 170 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 184 insertions(+) create mode 100644 drivers/acpi/fan_hwmon.c -- 2.39.2