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path: root/drivers/platform/x86/system76_acpi.c
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Diffstat (limited to 'drivers/platform/x86/system76_acpi.c')
-rw-r--r--drivers/platform/x86/system76_acpi.c781
1 files changed, 781 insertions, 0 deletions
diff --git a/drivers/platform/x86/system76_acpi.c b/drivers/platform/x86/system76_acpi.c
new file mode 100644
index 000000000..958df41ad
--- /dev/null
+++ b/drivers/platform/x86/system76_acpi.c
@@ -0,0 +1,781 @@
+// 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)
+{
+ // 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)
+{
+ 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 int 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");
+
+ 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");