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// SPDX-License-Identifier: GPL-2.0+
/*
* System76 ACPI Driver
*
* Copyright (C) 2019 System76
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/acpi.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/pci_ids.h>
#include <linux/power_supply.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <acpi/battery.h>
struct system76_data {
struct acpi_device *acpi_dev;
struct led_classdev ap_led;
struct led_classdev kb_led;
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;
struct input_dev *input;
bool has_open_ec;
};
static const struct acpi_device_id device_ids[] = {
{"17761776", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, device_ids);
// Array of keyboard LED brightness levels
static const enum led_brightness kb_levels[] = {
48,
72,
96,
144,
192,
255
};
// Array of keyboard LED colors in 24-bit RGB format
static const int kb_colors[] = {
0xFFFFFF,
0x0000FF,
0xFF0000,
0xFF00FF,
0x00FF00,
0x00FFFF,
0xFFFF00
};
// Get a System76 ACPI device value by name
static int system76_get(struct system76_data *data, char *method)
{
acpi_handle handle;
acpi_status status;
unsigned long long ret = 0;
handle = acpi_device_handle(data->acpi_dev);
status = acpi_evaluate_integer(handle, method, NULL, &ret);
if (ACPI_SUCCESS(status))
return ret;
return -ENODEV;
}
// 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 ret;
return -ENODEV;
}
// 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 = buf.pointer;
return 0;
}
return -ENODEV;
}
// 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)
{
union acpi_object obj;
struct acpi_object_list obj_list;
acpi_handle handle;
acpi_status status;
obj.type = ACPI_TYPE_INTEGER;
obj.integer.value = value;
obj_list.count = 1;
obj_list.pointer = &obj;
handle = acpi_device_handle(data->acpi_dev);
status = acpi_evaluate_object(handle, method, &obj_list, NULL);
if (ACPI_SUCCESS(status))
return 0;
else
return -1;
}
#define BATTERY_THRESHOLD_INVALID 0xFF
enum {
THRESHOLD_START,
THRESHOLD_END,
};
static ssize_t battery_get_threshold(int which, char *buf)
{
struct acpi_object_list input;
union acpi_object param;
acpi_handle handle;
acpi_status status;
unsigned long long ret = BATTERY_THRESHOLD_INVALID;
handle = ec_get_handle();
if (!handle)
return -ENODEV;
input.count = 1;
input.pointer = &param;
// Start/stop selection
param.type = ACPI_TYPE_INTEGER;
param.integer.value = which;
status = acpi_evaluate_integer(handle, "GBCT", &input, &ret);
if (ACPI_FAILURE(status))
return -EIO;
if (ret == BATTERY_THRESHOLD_INVALID)
return -EINVAL;
return sysfs_emit(buf, "%d\n", (int)ret);
}
static ssize_t battery_set_threshold(int which, const char *buf, size_t count)
{
struct acpi_object_list input;
union acpi_object params[2];
acpi_handle handle;
acpi_status status;
unsigned int value;
int ret;
handle = ec_get_handle();
if (!handle)
return -ENODEV;
ret = kstrtouint(buf, 10, &value);
if (ret)
return ret;
if (value > 100)
return -EINVAL;
input.count = 2;
input.pointer = params;
// Start/stop selection
params[0].type = ACPI_TYPE_INTEGER;
params[0].integer.value = which;
// Threshold value
params[1].type = ACPI_TYPE_INTEGER;
params[1].integer.value = value;
status = acpi_evaluate_object(handle, "SBCT", &input, NULL);
if (ACPI_FAILURE(status))
return -EIO;
return count;
}
static ssize_t charge_control_start_threshold_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return battery_get_threshold(THRESHOLD_START, buf);
}
static ssize_t charge_control_start_threshold_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return battery_set_threshold(THRESHOLD_START, buf, count);
}
static DEVICE_ATTR_RW(charge_control_start_threshold);
static ssize_t charge_control_end_threshold_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return battery_get_threshold(THRESHOLD_END, buf);
}
static ssize_t charge_control_end_threshold_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return battery_set_threshold(THRESHOLD_END, buf, count);
}
static DEVICE_ATTR_RW(charge_control_end_threshold);
static struct attribute *system76_battery_attrs[] = {
&dev_attr_charge_control_start_threshold.attr,
&dev_attr_charge_control_end_threshold.attr,
NULL,
};
ATTRIBUTE_GROUPS(system76_battery);
static int system76_battery_add(struct power_supply *battery, struct acpi_battery_hook *hook)
{
// System76 EC only supports 1 battery
if (strcmp(battery->desc->name, "BAT0") != 0)
return -ENODEV;
if (device_add_groups(&battery->dev, system76_battery_groups))
return -ENODEV;
return 0;
}
static int system76_battery_remove(struct power_supply *battery, struct acpi_battery_hook *hook)
{
device_remove_groups(&battery->dev, system76_battery_groups);
return 0;
}
static struct acpi_battery_hook system76_battery_hook = {
.add_battery = system76_battery_add,
.remove_battery = system76_battery_remove,
.name = "System76 Battery Extension",
};
static void system76_battery_init(void)
{
battery_hook_register(&system76_battery_hook);
}
static void system76_battery_exit(void)
{
battery_hook_unregister(&system76_battery_hook);
}
// Get the airplane mode LED brightness
static enum led_brightness ap_led_get(struct led_classdev *led)
{
struct system76_data *data;
int value;
data = container_of(led, struct system76_data, ap_led);
value = system76_get(data, "GAPL");
if (value > 0)
return (enum led_brightness)value;
else
return LED_OFF;
}
// Set the airplane mode LED brightness
static int ap_led_set(struct led_classdev *led, enum led_brightness value)
{
struct system76_data *data;
data = container_of(led, struct system76_data, ap_led);
return system76_set(data, "SAPL", value == LED_OFF ? 0 : 1);
}
// Get the last set keyboard LED brightness
static enum led_brightness kb_led_get(struct led_classdev *led)
{
struct system76_data *data;
data = container_of(led, struct system76_data, kb_led);
return data->kb_brightness;
}
// Set the keyboard LED brightness
static int kb_led_set(struct led_classdev *led, enum led_brightness value)
{
struct system76_data *data;
data = container_of(led, struct system76_data, kb_led);
data->kb_brightness = value;
return system76_set(data, "SKBL", (int)data->kb_brightness);
}
// Get the last set keyboard LED color
static ssize_t kb_led_color_show(
struct device *dev,
struct device_attribute *dev_attr,
char *buf)
{
struct led_classdev *led;
struct system76_data *data;
led = dev_get_drvdata(dev);
data = container_of(led, struct system76_data, kb_led);
return sysfs_emit(buf, "%06X\n", data->kb_color);
}
// Set the keyboard LED color
static ssize_t kb_led_color_store(
struct device *dev,
struct device_attribute *dev_attr,
const char *buf,
size_t size)
{
struct led_classdev *led;
struct system76_data *data;
unsigned int val;
int ret;
led = dev_get_drvdata(dev);
data = container_of(led, struct system76_data, kb_led);
ret = kstrtouint(buf, 16, &val);
if (ret)
return ret;
if (val > 0xFFFFFF)
return -EINVAL;
data->kb_color = (int)val;
system76_set(data, "SKBC", data->kb_color);
return size;
}
static struct device_attribute dev_attr_kb_led_color = {
.attr = {
.name = "color",
.mode = 0644,
},
.show = kb_led_color_show,
.store = kb_led_color_store,
};
static struct attribute *system76_kb_led_color_attrs[] = {
&dev_attr_kb_led_color.attr,
NULL,
};
ATTRIBUTE_GROUPS(system76_kb_led_color);
// Notify that the keyboard LED was changed by hardware
static void kb_led_notify(struct system76_data *data)
{
led_classdev_notify_brightness_hw_changed(
&data->kb_led,
data->kb_brightness
);
}
// Read keyboard LED brightness as set by hardware
static void kb_led_hotkey_hardware(struct system76_data *data)
{
int value;
value = system76_get(data, "GKBL");
if (value < 0)
return;
data->kb_brightness = value;
kb_led_notify(data);
}
// Toggle the keyboard LED
static void kb_led_hotkey_toggle(struct system76_data *data)
{
if (data->kb_brightness > 0) {
data->kb_toggle_brightness = data->kb_brightness;
kb_led_set(&data->kb_led, 0);
} else {
kb_led_set(&data->kb_led, data->kb_toggle_brightness);
}
kb_led_notify(data);
}
// Decrease the keyboard LED brightness
static void kb_led_hotkey_down(struct system76_data *data)
{
int i;
if (data->kb_brightness > 0) {
for (i = ARRAY_SIZE(kb_levels); i > 0; i--) {
if (kb_levels[i - 1] < data->kb_brightness) {
kb_led_set(&data->kb_led, kb_levels[i - 1]);
break;
}
}
} else {
kb_led_set(&data->kb_led, data->kb_toggle_brightness);
}
kb_led_notify(data);
}
// Increase the keyboard LED brightness
static void kb_led_hotkey_up(struct system76_data *data)
{
int i;
if (data->kb_brightness > 0) {
for (i = 0; i < ARRAY_SIZE(kb_levels); i++) {
if (kb_levels[i] > data->kb_brightness) {
kb_led_set(&data->kb_led, kb_levels[i]);
break;
}
}
} else {
kb_led_set(&data->kb_led, data->kb_toggle_brightness);
}
kb_led_notify(data);
}
// Cycle the keyboard LED color
static void kb_led_hotkey_color(struct system76_data *data)
{
int i;
if (data->kb_color < 0)
return;
if (data->kb_brightness > 0) {
for (i = 0; i < ARRAY_SIZE(kb_colors); i++) {
if (kb_colors[i] == data->kb_color)
break;
}
i += 1;
if (i >= ARRAY_SIZE(kb_colors))
i = 0;
data->kb_color = kb_colors[i];
system76_set(data, "SKBC", data->kb_color);
} else {
kb_led_set(&data->kb_led, data->kb_toggle_brightness);
}
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;
switch (type) {
case hwmon_fan:
case hwmon_pwm:
if (system76_name(data->nfan, channel))
return 0444;
break;
case hwmon_temp:
if (system76_name(data->ntmp, channel))
return 0444;
break;
default:
return 0;
}
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;
switch (type) {
case hwmon_fan:
if (attr == hwmon_fan_input) {
raw = system76_get_index(data, "GFAN", channel);
if (raw < 0)
return raw;
*val = (raw >> 8) & 0xFFFF;
return 0;
}
break;
case hwmon_pwm:
if (attr == hwmon_pwm_input) {
raw = system76_get_index(data, "GFAN", channel);
if (raw < 0)
return raw;
*val = raw & 0xFF;
return 0;
}
break;
case hwmon_temp:
if (attr == hwmon_temp_input) {
raw = system76_get_index(data, "GTMP", channel);
if (raw < 0)
return raw;
*val = raw * 1000;
return 0;
}
break;
default:
return -EOPNOTSUPP;
}
return -EOPNOTSUPP;
}
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);
switch (type) {
case hwmon_fan:
if (attr == hwmon_fan_label) {
*str = system76_name(data->nfan, channel);
if (*str)
return 0;
}
break;
case hwmon_temp:
if (attr == hwmon_temp_label) {
*str = system76_name(data->ntmp, channel);
if (*str)
return 0;
}
break;
default:
return -EOPNOTSUPP;
}
return -EOPNOTSUPP;
}
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,
};
static void input_key(struct system76_data *data, unsigned int code)
{
input_report_key(data->input, code, 1);
input_sync(data->input);
input_report_key(data->input, code, 0);
input_sync(data->input);
}
// Handle ACPI notification
static void system76_notify(struct acpi_device *acpi_dev, u32 event)
{
struct system76_data *data;
data = acpi_driver_data(acpi_dev);
switch (event) {
case 0x80:
kb_led_hotkey_hardware(data);
break;
case 0x81:
kb_led_hotkey_toggle(data);
break;
case 0x82:
kb_led_hotkey_down(data);
break;
case 0x83:
kb_led_hotkey_up(data);
break;
case 0x84:
kb_led_hotkey_color(data);
break;
case 0x85:
input_key(data, KEY_SCREENLOCK);
break;
}
}
// Add a System76 ACPI device
static int system76_add(struct acpi_device *acpi_dev)
{
struct system76_data *data;
int err;
data = devm_kzalloc(&acpi_dev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
acpi_dev->driver_data = data;
data->acpi_dev = acpi_dev;
// Some models do not run open EC firmware. Check for an ACPI method
// that only exists on open EC to guard functionality specific to it.
data->has_open_ec = acpi_has_method(acpi_device_handle(data->acpi_dev), "NFAN");
err = system76_get(data, "INIT");
if (err)
return err;
data->ap_led.name = "system76_acpi::airplane";
data->ap_led.flags = LED_CORE_SUSPENDRESUME;
data->ap_led.brightness_get = ap_led_get;
data->ap_led.brightness_set_blocking = ap_led_set;
data->ap_led.max_brightness = 1;
data->ap_led.default_trigger = "rfkill-none";
err = devm_led_classdev_register(&acpi_dev->dev, &data->ap_led);
if (err)
return err;
data->kb_led.name = "system76_acpi::kbd_backlight";
data->kb_led.flags = LED_BRIGHT_HW_CHANGED | LED_CORE_SUSPENDRESUME;
data->kb_led.brightness_get = kb_led_get;
data->kb_led.brightness_set_blocking = kb_led_set;
if (acpi_has_method(acpi_device_handle(data->acpi_dev), "SKBC")) {
data->kb_led.max_brightness = 255;
data->kb_led.groups = system76_kb_led_color_groups;
data->kb_toggle_brightness = 72;
data->kb_color = 0xffffff;
system76_set(data, "SKBC", data->kb_color);
} else {
data->kb_led.max_brightness = 5;
data->kb_color = -1;
}
err = devm_led_classdev_register(&acpi_dev->dev, &data->kb_led);
if (err)
return err;
data->input = devm_input_allocate_device(&acpi_dev->dev);
if (!data->input)
return -ENOMEM;
data->input->name = "System76 ACPI Hotkeys";
data->input->phys = "system76_acpi/input0";
data->input->id.bustype = BUS_HOST;
data->input->dev.parent = &acpi_dev->dev;
input_set_capability(data->input, EV_KEY, KEY_SCREENLOCK);
err = input_register_device(data->input);
if (err)
goto error;
if (data->has_open_ec) {
err = system76_get_object(data, "NFAN", &data->nfan);
if (err)
goto error;
err = system76_get_object(data, "NTMP", &data->ntmp);
if (err)
goto error;
data->therm = devm_hwmon_device_register_with_info(&acpi_dev->dev,
"system76_acpi", data, &thermal_chip_info, NULL);
err = PTR_ERR_OR_ZERO(data->therm);
if (err)
goto error;
system76_battery_init();
}
return 0;
error:
if (data->has_open_ec) {
kfree(data->ntmp);
kfree(data->nfan);
}
return err;
}
// Remove a System76 ACPI device
static void system76_remove(struct acpi_device *acpi_dev)
{
struct system76_data *data;
data = acpi_driver_data(acpi_dev);
if (data->has_open_ec) {
system76_battery_exit();
kfree(data->nfan);
kfree(data->ntmp);
}
devm_led_classdev_unregister(&acpi_dev->dev, &data->ap_led);
devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led);
system76_get(data, "FINI");
}
static struct acpi_driver system76_driver = {
.name = "System76 ACPI Driver",
.class = "hotkey",
.ids = device_ids,
.ops = {
.add = system76_add,
.remove = system76_remove,
.notify = system76_notify,
},
};
module_acpi_driver(system76_driver);
MODULE_DESCRIPTION("System76 ACPI Driver");
MODULE_AUTHOR("Jeremy Soller <jeremy@system76.com>");
MODULE_LICENSE("GPL");