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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/init.h>
- #include <linux/kernel.h>
- #include <linux/leds.h>
- #include <linux/module.h>
- #include <linux/pci_ids.h>
- #include <linux/types.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;
- };
- 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 (int)ret;
- else
- return -1;
- }
- // 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;
- }
- // 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 = (struct led_classdev *)dev->driver_data;
- data = container_of(led, struct system76_data, kb_led);
- return sprintf(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 = (struct led_classdev *)dev->driver_data;
- 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 const struct device_attribute kb_led_color_dev_attr = {
- .attr = {
- .name = "color",
- .mode = 0644,
- },
- .show = kb_led_color_show,
- .store = kb_led_color_store,
- };
- // 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);
- }
- // 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;
- }
- }
- // 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;
- 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_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;
- if (data->kb_color >= 0) {
- err = device_create_file(
- data->kb_led.dev,
- &kb_led_color_dev_attr
- );
- if (err)
- return err;
- }
- return 0;
- }
- // Remove a System76 ACPI device
- static int system76_remove(struct acpi_device *acpi_dev)
- {
- struct system76_data *data;
- data = acpi_driver_data(acpi_dev);
- if (data->kb_color >= 0)
- device_remove_file(data->kb_led.dev, &kb_led_color_dev_attr);
- devm_led_classdev_unregister(&acpi_dev->dev, &data->ap_led);
- devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led);
- system76_get(data, "FINI");
- return 0;
- }
- 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");
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