1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * System76 ACPI Driver 4 * 5 * Copyright (C) 2019 System76 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/acpi.h> 13 #include <linux/hwmon.h> 14 #include <linux/hwmon-sysfs.h> 15 #include <linux/init.h> 16 #include <linux/input.h> 17 #include <linux/kernel.h> 18 #include <linux/leds.h> 19 #include <linux/module.h> 20 #include <linux/pci_ids.h> 21 #include <linux/power_supply.h> 22 #include <linux/sysfs.h> 23 #include <linux/types.h> 24 25 #include <acpi/battery.h> 26 27 struct system76_data { 28 struct acpi_device *acpi_dev; 29 struct led_classdev ap_led; 30 struct led_classdev kb_led; 31 enum led_brightness kb_brightness; 32 enum led_brightness kb_toggle_brightness; 33 int kb_color; 34 struct device *therm; 35 union acpi_object *nfan; 36 union acpi_object *ntmp; 37 struct input_dev *input; 38 bool has_open_ec; 39 }; 40 41 static const struct acpi_device_id device_ids[] = { 42 {"17761776", 0}, 43 {"", 0}, 44 }; 45 MODULE_DEVICE_TABLE(acpi, device_ids); 46 47 // Array of keyboard LED brightness levels 48 static const enum led_brightness kb_levels[] = { 49 48, 50 72, 51 96, 52 144, 53 192, 54 255 55 }; 56 57 // Array of keyboard LED colors in 24-bit RGB format 58 static const int kb_colors[] = { 59 0xFFFFFF, 60 0x0000FF, 61 0xFF0000, 62 0xFF00FF, 63 0x00FF00, 64 0x00FFFF, 65 0xFFFF00 66 }; 67 68 // Get a System76 ACPI device value by name 69 static int system76_get(struct system76_data *data, char *method) 70 { 71 acpi_handle handle; 72 acpi_status status; 73 unsigned long long ret = 0; 74 75 handle = acpi_device_handle(data->acpi_dev); 76 status = acpi_evaluate_integer(handle, method, NULL, &ret); 77 if (ACPI_SUCCESS(status)) 78 return ret; 79 return -ENODEV; 80 } 81 82 // Get a System76 ACPI device value by name with index 83 static int system76_get_index(struct system76_data *data, char *method, int index) 84 { 85 union acpi_object obj; 86 struct acpi_object_list obj_list; 87 acpi_handle handle; 88 acpi_status status; 89 unsigned long long ret = 0; 90 91 obj.type = ACPI_TYPE_INTEGER; 92 obj.integer.value = index; 93 obj_list.count = 1; 94 obj_list.pointer = &obj; 95 96 handle = acpi_device_handle(data->acpi_dev); 97 status = acpi_evaluate_integer(handle, method, &obj_list, &ret); 98 if (ACPI_SUCCESS(status)) 99 return ret; 100 return -ENODEV; 101 } 102 103 // Get a System76 ACPI device object by name 104 static int system76_get_object(struct system76_data *data, char *method, union acpi_object **obj) 105 { 106 acpi_handle handle; 107 acpi_status status; 108 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; 109 110 handle = acpi_device_handle(data->acpi_dev); 111 status = acpi_evaluate_object(handle, method, NULL, &buf); 112 if (ACPI_SUCCESS(status)) { 113 *obj = buf.pointer; 114 return 0; 115 } 116 117 return -ENODEV; 118 } 119 120 // Get a name from a System76 ACPI device object 121 static char *system76_name(union acpi_object *obj, int index) 122 { 123 if (obj && obj->type == ACPI_TYPE_PACKAGE && index <= obj->package.count) { 124 if (obj->package.elements[index].type == ACPI_TYPE_STRING) 125 return obj->package.elements[index].string.pointer; 126 } 127 128 return NULL; 129 } 130 131 // Set a System76 ACPI device value by name 132 static int system76_set(struct system76_data *data, char *method, int value) 133 { 134 union acpi_object obj; 135 struct acpi_object_list obj_list; 136 acpi_handle handle; 137 acpi_status status; 138 139 obj.type = ACPI_TYPE_INTEGER; 140 obj.integer.value = value; 141 obj_list.count = 1; 142 obj_list.pointer = &obj; 143 handle = acpi_device_handle(data->acpi_dev); 144 status = acpi_evaluate_object(handle, method, &obj_list, NULL); 145 if (ACPI_SUCCESS(status)) 146 return 0; 147 else 148 return -1; 149 } 150 151 #define BATTERY_THRESHOLD_INVALID 0xFF 152 153 enum { 154 THRESHOLD_START, 155 THRESHOLD_END, 156 }; 157 158 static ssize_t battery_get_threshold(int which, char *buf) 159 { 160 struct acpi_object_list input; 161 union acpi_object param; 162 acpi_handle handle; 163 acpi_status status; 164 unsigned long long ret = BATTERY_THRESHOLD_INVALID; 165 166 handle = ec_get_handle(); 167 if (!handle) 168 return -ENODEV; 169 170 input.count = 1; 171 input.pointer = ¶m; 172 // Start/stop selection 173 param.type = ACPI_TYPE_INTEGER; 174 param.integer.value = which; 175 176 status = acpi_evaluate_integer(handle, "GBCT", &input, &ret); 177 if (ACPI_FAILURE(status)) 178 return -EIO; 179 if (ret == BATTERY_THRESHOLD_INVALID) 180 return -EINVAL; 181 182 return sysfs_emit(buf, "%d\n", (int)ret); 183 } 184 185 static ssize_t battery_set_threshold(int which, const char *buf, size_t count) 186 { 187 struct acpi_object_list input; 188 union acpi_object params[2]; 189 acpi_handle handle; 190 acpi_status status; 191 unsigned int value; 192 int ret; 193 194 handle = ec_get_handle(); 195 if (!handle) 196 return -ENODEV; 197 198 ret = kstrtouint(buf, 10, &value); 199 if (ret) 200 return ret; 201 202 if (value > 100) 203 return -EINVAL; 204 205 input.count = 2; 206 input.pointer = params; 207 // Start/stop selection 208 params[0].type = ACPI_TYPE_INTEGER; 209 params[0].integer.value = which; 210 // Threshold value 211 params[1].type = ACPI_TYPE_INTEGER; 212 params[1].integer.value = value; 213 214 status = acpi_evaluate_object(handle, "SBCT", &input, NULL); 215 if (ACPI_FAILURE(status)) 216 return -EIO; 217 218 return count; 219 } 220 221 static ssize_t charge_control_start_threshold_show(struct device *dev, 222 struct device_attribute *attr, char *buf) 223 { 224 return battery_get_threshold(THRESHOLD_START, buf); 225 } 226 227 static ssize_t charge_control_start_threshold_store(struct device *dev, 228 struct device_attribute *attr, const char *buf, size_t count) 229 { 230 return battery_set_threshold(THRESHOLD_START, buf, count); 231 } 232 233 static DEVICE_ATTR_RW(charge_control_start_threshold); 234 235 static ssize_t charge_control_end_threshold_show(struct device *dev, 236 struct device_attribute *attr, char *buf) 237 { 238 return battery_get_threshold(THRESHOLD_END, buf); 239 } 240 241 static ssize_t charge_control_end_threshold_store(struct device *dev, 242 struct device_attribute *attr, const char *buf, size_t count) 243 { 244 return battery_set_threshold(THRESHOLD_END, buf, count); 245 } 246 247 static DEVICE_ATTR_RW(charge_control_end_threshold); 248 249 static struct attribute *system76_battery_attrs[] = { 250 &dev_attr_charge_control_start_threshold.attr, 251 &dev_attr_charge_control_end_threshold.attr, 252 NULL, 253 }; 254 255 ATTRIBUTE_GROUPS(system76_battery); 256 257 static int system76_battery_add(struct power_supply *battery) 258 { 259 // System76 EC only supports 1 battery 260 if (strcmp(battery->desc->name, "BAT0") != 0) 261 return -ENODEV; 262 263 if (device_add_groups(&battery->dev, system76_battery_groups)) 264 return -ENODEV; 265 266 return 0; 267 } 268 269 static int system76_battery_remove(struct power_supply *battery) 270 { 271 device_remove_groups(&battery->dev, system76_battery_groups); 272 return 0; 273 } 274 275 static struct acpi_battery_hook system76_battery_hook = { 276 .add_battery = system76_battery_add, 277 .remove_battery = system76_battery_remove, 278 .name = "System76 Battery Extension", 279 }; 280 281 static void system76_battery_init(void) 282 { 283 battery_hook_register(&system76_battery_hook); 284 } 285 286 static void system76_battery_exit(void) 287 { 288 battery_hook_unregister(&system76_battery_hook); 289 } 290 291 // Get the airplane mode LED brightness 292 static enum led_brightness ap_led_get(struct led_classdev *led) 293 { 294 struct system76_data *data; 295 int value; 296 297 data = container_of(led, struct system76_data, ap_led); 298 value = system76_get(data, "GAPL"); 299 if (value > 0) 300 return (enum led_brightness)value; 301 else 302 return LED_OFF; 303 } 304 305 // Set the airplane mode LED brightness 306 static int ap_led_set(struct led_classdev *led, enum led_brightness value) 307 { 308 struct system76_data *data; 309 310 data = container_of(led, struct system76_data, ap_led); 311 return system76_set(data, "SAPL", value == LED_OFF ? 0 : 1); 312 } 313 314 // Get the last set keyboard LED brightness 315 static enum led_brightness kb_led_get(struct led_classdev *led) 316 { 317 struct system76_data *data; 318 319 data = container_of(led, struct system76_data, kb_led); 320 return data->kb_brightness; 321 } 322 323 // Set the keyboard LED brightness 324 static int kb_led_set(struct led_classdev *led, enum led_brightness value) 325 { 326 struct system76_data *data; 327 328 data = container_of(led, struct system76_data, kb_led); 329 data->kb_brightness = value; 330 return system76_set(data, "SKBL", (int)data->kb_brightness); 331 } 332 333 // Get the last set keyboard LED color 334 static ssize_t kb_led_color_show( 335 struct device *dev, 336 struct device_attribute *dev_attr, 337 char *buf) 338 { 339 struct led_classdev *led; 340 struct system76_data *data; 341 342 led = (struct led_classdev *)dev->driver_data; 343 data = container_of(led, struct system76_data, kb_led); 344 return sysfs_emit(buf, "%06X\n", data->kb_color); 345 } 346 347 // Set the keyboard LED color 348 static ssize_t kb_led_color_store( 349 struct device *dev, 350 struct device_attribute *dev_attr, 351 const char *buf, 352 size_t size) 353 { 354 struct led_classdev *led; 355 struct system76_data *data; 356 unsigned int val; 357 int ret; 358 359 led = (struct led_classdev *)dev->driver_data; 360 data = container_of(led, struct system76_data, kb_led); 361 ret = kstrtouint(buf, 16, &val); 362 if (ret) 363 return ret; 364 if (val > 0xFFFFFF) 365 return -EINVAL; 366 data->kb_color = (int)val; 367 system76_set(data, "SKBC", data->kb_color); 368 369 return size; 370 } 371 372 static struct device_attribute dev_attr_kb_led_color = { 373 .attr = { 374 .name = "color", 375 .mode = 0644, 376 }, 377 .show = kb_led_color_show, 378 .store = kb_led_color_store, 379 }; 380 381 static struct attribute *system76_kb_led_color_attrs[] = { 382 &dev_attr_kb_led_color.attr, 383 NULL, 384 }; 385 386 ATTRIBUTE_GROUPS(system76_kb_led_color); 387 388 // Notify that the keyboard LED was changed by hardware 389 static void kb_led_notify(struct system76_data *data) 390 { 391 led_classdev_notify_brightness_hw_changed( 392 &data->kb_led, 393 data->kb_brightness 394 ); 395 } 396 397 // Read keyboard LED brightness as set by hardware 398 static void kb_led_hotkey_hardware(struct system76_data *data) 399 { 400 int value; 401 402 value = system76_get(data, "GKBL"); 403 if (value < 0) 404 return; 405 data->kb_brightness = value; 406 kb_led_notify(data); 407 } 408 409 // Toggle the keyboard LED 410 static void kb_led_hotkey_toggle(struct system76_data *data) 411 { 412 if (data->kb_brightness > 0) { 413 data->kb_toggle_brightness = data->kb_brightness; 414 kb_led_set(&data->kb_led, 0); 415 } else { 416 kb_led_set(&data->kb_led, data->kb_toggle_brightness); 417 } 418 kb_led_notify(data); 419 } 420 421 // Decrease the keyboard LED brightness 422 static void kb_led_hotkey_down(struct system76_data *data) 423 { 424 int i; 425 426 if (data->kb_brightness > 0) { 427 for (i = ARRAY_SIZE(kb_levels); i > 0; i--) { 428 if (kb_levels[i - 1] < data->kb_brightness) { 429 kb_led_set(&data->kb_led, kb_levels[i - 1]); 430 break; 431 } 432 } 433 } else { 434 kb_led_set(&data->kb_led, data->kb_toggle_brightness); 435 } 436 kb_led_notify(data); 437 } 438 439 // Increase the keyboard LED brightness 440 static void kb_led_hotkey_up(struct system76_data *data) 441 { 442 int i; 443 444 if (data->kb_brightness > 0) { 445 for (i = 0; i < ARRAY_SIZE(kb_levels); i++) { 446 if (kb_levels[i] > data->kb_brightness) { 447 kb_led_set(&data->kb_led, kb_levels[i]); 448 break; 449 } 450 } 451 } else { 452 kb_led_set(&data->kb_led, data->kb_toggle_brightness); 453 } 454 kb_led_notify(data); 455 } 456 457 // Cycle the keyboard LED color 458 static void kb_led_hotkey_color(struct system76_data *data) 459 { 460 int i; 461 462 if (data->kb_color < 0) 463 return; 464 if (data->kb_brightness > 0) { 465 for (i = 0; i < ARRAY_SIZE(kb_colors); i++) { 466 if (kb_colors[i] == data->kb_color) 467 break; 468 } 469 i += 1; 470 if (i >= ARRAY_SIZE(kb_colors)) 471 i = 0; 472 data->kb_color = kb_colors[i]; 473 system76_set(data, "SKBC", data->kb_color); 474 } else { 475 kb_led_set(&data->kb_led, data->kb_toggle_brightness); 476 } 477 kb_led_notify(data); 478 } 479 480 static umode_t thermal_is_visible(const void *drvdata, enum hwmon_sensor_types type, 481 u32 attr, int channel) 482 { 483 const struct system76_data *data = drvdata; 484 485 switch (type) { 486 case hwmon_fan: 487 case hwmon_pwm: 488 if (system76_name(data->nfan, channel)) 489 return 0444; 490 break; 491 492 case hwmon_temp: 493 if (system76_name(data->ntmp, channel)) 494 return 0444; 495 break; 496 497 default: 498 return 0; 499 } 500 501 return 0; 502 } 503 504 static int thermal_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, 505 int channel, long *val) 506 { 507 struct system76_data *data = dev_get_drvdata(dev); 508 int raw; 509 510 switch (type) { 511 case hwmon_fan: 512 if (attr == hwmon_fan_input) { 513 raw = system76_get_index(data, "GFAN", channel); 514 if (raw < 0) 515 return raw; 516 *val = (raw >> 8) & 0xFFFF; 517 return 0; 518 } 519 break; 520 521 case hwmon_pwm: 522 if (attr == hwmon_pwm_input) { 523 raw = system76_get_index(data, "GFAN", channel); 524 if (raw < 0) 525 return raw; 526 *val = raw & 0xFF; 527 return 0; 528 } 529 break; 530 531 case hwmon_temp: 532 if (attr == hwmon_temp_input) { 533 raw = system76_get_index(data, "GTMP", channel); 534 if (raw < 0) 535 return raw; 536 *val = raw * 1000; 537 return 0; 538 } 539 break; 540 541 default: 542 return -EOPNOTSUPP; 543 } 544 545 return -EOPNOTSUPP; 546 } 547 548 static int thermal_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, 549 int channel, const char **str) 550 { 551 struct system76_data *data = dev_get_drvdata(dev); 552 553 switch (type) { 554 case hwmon_fan: 555 if (attr == hwmon_fan_label) { 556 *str = system76_name(data->nfan, channel); 557 if (*str) 558 return 0; 559 } 560 break; 561 562 case hwmon_temp: 563 if (attr == hwmon_temp_label) { 564 *str = system76_name(data->ntmp, channel); 565 if (*str) 566 return 0; 567 } 568 break; 569 570 default: 571 return -EOPNOTSUPP; 572 } 573 574 return -EOPNOTSUPP; 575 } 576 577 static const struct hwmon_ops thermal_ops = { 578 .is_visible = thermal_is_visible, 579 .read = thermal_read, 580 .read_string = thermal_read_string, 581 }; 582 583 // Allocate up to 8 fans and temperatures 584 static const struct hwmon_channel_info *thermal_channel_info[] = { 585 HWMON_CHANNEL_INFO(fan, 586 HWMON_F_INPUT | HWMON_F_LABEL, 587 HWMON_F_INPUT | HWMON_F_LABEL, 588 HWMON_F_INPUT | HWMON_F_LABEL, 589 HWMON_F_INPUT | HWMON_F_LABEL, 590 HWMON_F_INPUT | HWMON_F_LABEL, 591 HWMON_F_INPUT | HWMON_F_LABEL, 592 HWMON_F_INPUT | HWMON_F_LABEL, 593 HWMON_F_INPUT | HWMON_F_LABEL), 594 HWMON_CHANNEL_INFO(pwm, 595 HWMON_PWM_INPUT, 596 HWMON_PWM_INPUT, 597 HWMON_PWM_INPUT, 598 HWMON_PWM_INPUT, 599 HWMON_PWM_INPUT, 600 HWMON_PWM_INPUT, 601 HWMON_PWM_INPUT, 602 HWMON_PWM_INPUT), 603 HWMON_CHANNEL_INFO(temp, 604 HWMON_T_INPUT | HWMON_T_LABEL, 605 HWMON_T_INPUT | HWMON_T_LABEL, 606 HWMON_T_INPUT | HWMON_T_LABEL, 607 HWMON_T_INPUT | HWMON_T_LABEL, 608 HWMON_T_INPUT | HWMON_T_LABEL, 609 HWMON_T_INPUT | HWMON_T_LABEL, 610 HWMON_T_INPUT | HWMON_T_LABEL, 611 HWMON_T_INPUT | HWMON_T_LABEL), 612 NULL 613 }; 614 615 static const struct hwmon_chip_info thermal_chip_info = { 616 .ops = &thermal_ops, 617 .info = thermal_channel_info, 618 }; 619 620 static void input_key(struct system76_data *data, unsigned int code) 621 { 622 input_report_key(data->input, code, 1); 623 input_sync(data->input); 624 625 input_report_key(data->input, code, 0); 626 input_sync(data->input); 627 } 628 629 // Handle ACPI notification 630 static void system76_notify(struct acpi_device *acpi_dev, u32 event) 631 { 632 struct system76_data *data; 633 634 data = acpi_driver_data(acpi_dev); 635 switch (event) { 636 case 0x80: 637 kb_led_hotkey_hardware(data); 638 break; 639 case 0x81: 640 kb_led_hotkey_toggle(data); 641 break; 642 case 0x82: 643 kb_led_hotkey_down(data); 644 break; 645 case 0x83: 646 kb_led_hotkey_up(data); 647 break; 648 case 0x84: 649 kb_led_hotkey_color(data); 650 break; 651 case 0x85: 652 input_key(data, KEY_SCREENLOCK); 653 break; 654 } 655 } 656 657 // Add a System76 ACPI device 658 static int system76_add(struct acpi_device *acpi_dev) 659 { 660 struct system76_data *data; 661 int err; 662 663 data = devm_kzalloc(&acpi_dev->dev, sizeof(*data), GFP_KERNEL); 664 if (!data) 665 return -ENOMEM; 666 acpi_dev->driver_data = data; 667 data->acpi_dev = acpi_dev; 668 669 // Some models do not run open EC firmware. Check for an ACPI method 670 // that only exists on open EC to guard functionality specific to it. 671 data->has_open_ec = acpi_has_method(acpi_device_handle(data->acpi_dev), "NFAN"); 672 673 err = system76_get(data, "INIT"); 674 if (err) 675 return err; 676 data->ap_led.name = "system76_acpi::airplane"; 677 data->ap_led.flags = LED_CORE_SUSPENDRESUME; 678 data->ap_led.brightness_get = ap_led_get; 679 data->ap_led.brightness_set_blocking = ap_led_set; 680 data->ap_led.max_brightness = 1; 681 data->ap_led.default_trigger = "rfkill-none"; 682 err = devm_led_classdev_register(&acpi_dev->dev, &data->ap_led); 683 if (err) 684 return err; 685 686 data->kb_led.name = "system76_acpi::kbd_backlight"; 687 data->kb_led.flags = LED_BRIGHT_HW_CHANGED | LED_CORE_SUSPENDRESUME; 688 data->kb_led.brightness_get = kb_led_get; 689 data->kb_led.brightness_set_blocking = kb_led_set; 690 if (acpi_has_method(acpi_device_handle(data->acpi_dev), "SKBC")) { 691 data->kb_led.max_brightness = 255; 692 data->kb_led.groups = system76_kb_led_color_groups; 693 data->kb_toggle_brightness = 72; 694 data->kb_color = 0xffffff; 695 system76_set(data, "SKBC", data->kb_color); 696 } else { 697 data->kb_led.max_brightness = 5; 698 data->kb_color = -1; 699 } 700 err = devm_led_classdev_register(&acpi_dev->dev, &data->kb_led); 701 if (err) 702 return err; 703 704 data->input = devm_input_allocate_device(&acpi_dev->dev); 705 if (!data->input) 706 return -ENOMEM; 707 708 data->input->name = "System76 ACPI Hotkeys"; 709 data->input->phys = "system76_acpi/input0"; 710 data->input->id.bustype = BUS_HOST; 711 data->input->dev.parent = &acpi_dev->dev; 712 input_set_capability(data->input, EV_KEY, KEY_SCREENLOCK); 713 714 err = input_register_device(data->input); 715 if (err) 716 goto error; 717 718 if (data->has_open_ec) { 719 err = system76_get_object(data, "NFAN", &data->nfan); 720 if (err) 721 goto error; 722 723 err = system76_get_object(data, "NTMP", &data->ntmp); 724 if (err) 725 goto error; 726 727 data->therm = devm_hwmon_device_register_with_info(&acpi_dev->dev, 728 "system76_acpi", data, &thermal_chip_info, NULL); 729 err = PTR_ERR_OR_ZERO(data->therm); 730 if (err) 731 goto error; 732 733 system76_battery_init(); 734 } 735 736 return 0; 737 738 error: 739 if (data->has_open_ec) { 740 kfree(data->ntmp); 741 kfree(data->nfan); 742 } 743 return err; 744 } 745 746 // Remove a System76 ACPI device 747 static int system76_remove(struct acpi_device *acpi_dev) 748 { 749 struct system76_data *data; 750 751 data = acpi_driver_data(acpi_dev); 752 753 if (data->has_open_ec) { 754 system76_battery_exit(); 755 kfree(data->nfan); 756 kfree(data->ntmp); 757 } 758 759 devm_led_classdev_unregister(&acpi_dev->dev, &data->ap_led); 760 devm_led_classdev_unregister(&acpi_dev->dev, &data->kb_led); 761 762 system76_get(data, "FINI"); 763 764 return 0; 765 } 766 767 static struct acpi_driver system76_driver = { 768 .name = "System76 ACPI Driver", 769 .class = "hotkey", 770 .ids = device_ids, 771 .ops = { 772 .add = system76_add, 773 .remove = system76_remove, 774 .notify = system76_notify, 775 }, 776 }; 777 module_acpi_driver(system76_driver); 778 779 MODULE_DESCRIPTION("System76 ACPI Driver"); 780 MODULE_AUTHOR("Jeremy Soller <jeremy@system76.com>"); 781 MODULE_LICENSE("GPL"); 782