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Add hwmon interface

This commit is contained in:
Jeremy Soller 2020-09-03 11:14:03 -06:00 committed by Jeremy Soller
parent 6efb1dba70
commit 03aca3da39
1 changed files with 162 additions and 0 deletions
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162
system76_acpi.c
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@ -10,6 +10,8 @@
*/
#include <linux/acpi.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/leds.h>
@ -24,6 +26,9 @@ struct system76_data {
enum led_brightness kb_brightness;
enum led_brightness kb_toggle_brightness;
int kb_color;
struct device *therm;
union acpi_object *nfan;
union acpi_object *ntmp;
};
static const struct acpi_device_id device_ids[] = {
@ -68,6 +73,54 @@ static int system76_get(struct system76_data *data, char *method)
return -1;
}
// Get a System76 ACPI device value by name with index
static int system76_get_index(struct system76_data *data, char *method, int index)
{
union acpi_object obj;
struct acpi_object_list obj_list;
acpi_handle handle;
acpi_status status;
unsigned long long ret = 0;
obj.type = ACPI_TYPE_INTEGER;
obj.integer.value = index;
obj_list.count = 1;
obj_list.pointer = &obj;
handle = acpi_device_handle(data->acpi_dev);
status = acpi_evaluate_integer(handle, method, &obj_list, &ret);
if (ACPI_SUCCESS(status))
return (int)ret;
else
return -1;
}
// Get a System76 ACPI device object by name
static int system76_get_object(struct system76_data *data, char *method, union acpi_object **obj)
{
acpi_handle handle;
acpi_status status;
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
handle = acpi_device_handle(data->acpi_dev);
status = acpi_evaluate_object(handle, method, NULL, &buf);
if (ACPI_SUCCESS(status)) {
*obj = (union acpi_object *)buf.pointer;
return 0;
} else {
return -1;
}
}
// Get a name from a System76 ACPI device object
static char * system76_name(union acpi_object *obj, int index) {
if (obj && obj->type == ACPI_TYPE_PACKAGE && index <= obj->package.count) {
if (obj->package.elements[index].type == ACPI_TYPE_STRING) {
return obj->package.elements[index].string.pointer;
}
}
return NULL;
}
// Set a System76 ACPI device value by name
static int system76_set(struct system76_data *data, char *method, int value)
{
@ -270,6 +323,105 @@ static void kb_led_hotkey_color(struct system76_data *data)
kb_led_notify(data);
}
static umode_t thermal_is_visible(const void *drvdata, enum hwmon_sensor_types type, u32 attr, int channel) {
const struct system76_data *data = drvdata;
if (type == hwmon_fan || type == hwmon_pwm) {
if (system76_name(data->nfan, channel)) {
return S_IRUGO;
}
} else if (type == hwmon_temp) {
if (system76_name(data->ntmp, channel)) {
return S_IRUGO;
}
}
return 0;
}
static int thermal_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) {
struct system76_data *data = dev_get_drvdata(dev);
int raw;
if (type == hwmon_fan && attr == hwmon_fan_input) {
raw = system76_get_index(data, "GFAN", channel);
if (raw >= 0) {
*val = (long)((raw >> 8) & 0xFFFF);
return 0;
}
} else if (type == hwmon_pwm && attr == hwmon_pwm_input) {
raw = system76_get_index(data, "GFAN", channel);
if (raw >= 0) {
*val = (long)(raw & 0xFF);
return 0;
}
} else if (type == hwmon_temp && attr == hwmon_temp_input) {
raw = system76_get_index(data, "GTMP", channel);
if (raw >= 0) {
*val = (long)(raw * 1000);
return 0;
}
}
return -EINVAL;
}
static int thermal_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, const char **str) {
struct system76_data *data = dev_get_drvdata(dev);
if (type == hwmon_fan && attr == hwmon_fan_label) {
*str = system76_name(data->nfan, channel);
if (*str)
return 0;
} else if (type == hwmon_temp && attr == hwmon_temp_label) {
*str = system76_name(data->ntmp, channel);
if (*str)
return 0;
}
return -EINVAL;
}
static const struct hwmon_ops thermal_ops = {
.is_visible = thermal_is_visible,
.read = thermal_read,
.read_string = thermal_read_string,
};
// Allocate up to 8 fans and temperatures
static const struct hwmon_channel_info *thermal_channel_info[] = {
HWMON_CHANNEL_INFO(fan,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL,
HWMON_F_INPUT | HWMON_F_LABEL),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT,
HWMON_PWM_INPUT),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL,
HWMON_T_INPUT | HWMON_T_LABEL),
NULL
};
static const struct hwmon_chip_info thermal_chip_info = {
.ops = &thermal_ops,
.info = thermal_channel_info,
};
// Handle ACPI notification
static void system76_notify(struct acpi_device *acpi_dev, u32 event)
{
@ -346,6 +498,12 @@ static int system76_add(struct acpi_device *acpi_dev)
return err;
}
system76_get_object(data, "NFAN", &data->nfan);
system76_get_object(data, "NTMP", &data->ntmp);
data->therm = devm_hwmon_device_register_with_info(&acpi_dev->dev, "system76_acpi", data, &thermal_chip_info, NULL);
if (IS_ERR(data->therm))
return PTR_ERR(data->therm);
return 0;
}
@ -361,6 +519,10 @@ static int system76_remove(struct acpi_device *acpi_dev)
devm_led_classdev_unregister(&acpi_dev->dev, &data->ap_led);
devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led);
if (data->nfan)
kfree(data->nfan);
if (data->ntmp)
kfree(data->ntmp);
system76_get(data, "FINI");