drivers/hid/hid-nvidia-shield.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
   4  *
   5  *  HID driver for NVIDIA SHIELD peripherals.
   6  */
   7
   8 #include <linux/hid.h>
   9 #include <linux/idr.h>
  10 #include <linux/input-event-codes.h>
  11 #include <linux/input.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/leds.h>
  14 #include <linux/module.h>
  15 #include <linux/power_supply.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/timer.h>
  18 #include <linux/workqueue.h>
  19
  20 #include "hid-ids.h"
  21
  22 #define NOT_INIT_STR "NOT INITIALIZED"
  23 #define android_map_key(c) hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
  24
  25 enum {
  26         HID_USAGE_ANDROID_PLAYPAUSE_BTN = 0xcd, /* Double-tap volume slider */
  27         HID_USAGE_ANDROID_VOLUMEUP_BTN = 0xe9,
  28         HID_USAGE_ANDROID_VOLUMEDOWN_BTN = 0xea,
  29         HID_USAGE_ANDROID_SEARCH_BTN = 0x221, /* NVIDIA btn on Thunderstrike */
  30         HID_USAGE_ANDROID_HOME_BTN = 0x223,
  31         HID_USAGE_ANDROID_BACK_BTN = 0x224,
  32 };
  33
  34 enum {
  35         SHIELD_FW_VERSION_INITIALIZED = 0,
  36         SHIELD_BOARD_INFO_INITIALIZED,
  37         SHIELD_BATTERY_STATS_INITIALIZED,
  38         SHIELD_CHARGER_STATE_INITIALIZED,
  39 };
  40
  41 enum {
  42         THUNDERSTRIKE_FW_VERSION_UPDATE = 0,
  43         THUNDERSTRIKE_BOARD_INFO_UPDATE,
  44         THUNDERSTRIKE_HAPTICS_UPDATE,
  45         THUNDERSTRIKE_LED_UPDATE,
  46         THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE,
  47 };
  48
  49 enum {
  50         THUNDERSTRIKE_HOSTCMD_REPORT_SIZE = 33,
  51         THUNDERSTRIKE_HOSTCMD_REQ_REPORT_ID = 0x4,
  52         THUNDERSTRIKE_HOSTCMD_RESP_REPORT_ID = 0x3,
  53 };
  54
  55 enum {
  56         THUNDERSTRIKE_HOSTCMD_ID_FW_VERSION = 1,
  57         THUNDERSTRIKE_HOSTCMD_ID_LED = 6,
  58         THUNDERSTRIKE_HOSTCMD_ID_BATTERY,
  59         THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO = 16,
  60         THUNDERSTRIKE_HOSTCMD_ID_USB_INIT = 53,
  61         THUNDERSTRIKE_HOSTCMD_ID_HAPTICS = 57,
  62         THUNDERSTRIKE_HOSTCMD_ID_CHARGER,
  63 };
  64
  65 struct power_supply_dev {
  66         struct power_supply *psy;
  67         struct power_supply_desc desc;
  68 };
  69
  70 struct thunderstrike_psy_prop_values {
  71         int voltage_min;
  72         int voltage_now;
  73         int voltage_avg;
  74         int voltage_boot;
  75         int capacity;
  76         int status;
  77         int charge_type;
  78         int temp;
  79 };
  80
  81 static const enum power_supply_property thunderstrike_battery_props[] = {
  82         POWER_SUPPLY_PROP_STATUS,
  83         POWER_SUPPLY_PROP_CHARGE_TYPE,
  84         POWER_SUPPLY_PROP_PRESENT,
  85         POWER_SUPPLY_PROP_VOLTAGE_MIN,
  86         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  87         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
  88         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  89         POWER_SUPPLY_PROP_VOLTAGE_AVG,
  90         POWER_SUPPLY_PROP_VOLTAGE_BOOT,
  91         POWER_SUPPLY_PROP_CAPACITY,
  92         POWER_SUPPLY_PROP_SCOPE,
  93         POWER_SUPPLY_PROP_TEMP,
  94         POWER_SUPPLY_PROP_TEMP_MIN,
  95         POWER_SUPPLY_PROP_TEMP_MAX,
  96         POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
  97         POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
  98 };
  99
 100 enum thunderstrike_led_state {
 101         THUNDERSTRIKE_LED_OFF = 1,
 102         THUNDERSTRIKE_LED_ON = 8,
 103 } __packed;
 104 static_assert(sizeof(enum thunderstrike_led_state) == 1);
 105
 106 struct thunderstrike_hostcmd_battery {
 107         __le16 voltage_avg;
 108         u8 reserved_at_10;
 109         __le16 thermistor;
 110         __le16 voltage_min;
 111         __le16 voltage_boot;
 112         __le16 voltage_now;
 113         u8 capacity;
 114 } __packed;
 115
 116 enum thunderstrike_charger_type {
 117         THUNDERSTRIKE_CHARGER_TYPE_NONE = 0,
 118         THUNDERSTRIKE_CHARGER_TYPE_TRICKLE,
 119         THUNDERSTRIKE_CHARGER_TYPE_NORMAL,
 120 } __packed;
 121 static_assert(sizeof(enum thunderstrike_charger_type) == 1);
 122
 123 enum thunderstrike_charger_state {
 124         THUNDERSTRIKE_CHARGER_STATE_UNKNOWN = 0,
 125         THUNDERSTRIKE_CHARGER_STATE_DISABLED,
 126         THUNDERSTRIKE_CHARGER_STATE_CHARGING,
 127         THUNDERSTRIKE_CHARGER_STATE_FULL,
 128         THUNDERSTRIKE_CHARGER_STATE_FAILED = 8,
 129 } __packed;
 130 static_assert(sizeof(enum thunderstrike_charger_state) == 1);
 131
 132 struct thunderstrike_hostcmd_charger {
 133         u8 connected;
 134         enum thunderstrike_charger_type type;
 135         enum thunderstrike_charger_state state;
 136 } __packed;
 137
 138 struct thunderstrike_hostcmd_board_info {
 139         __le16 revision;
 140         __le16 serial[7];
 141 } __packed;
 142
 143 struct thunderstrike_hostcmd_haptics {
 144         u8 motor_left;
 145         u8 motor_right;
 146 } __packed;
 147
 148 struct thunderstrike_hostcmd_resp_report {
 149         u8 report_id; /* THUNDERSTRIKE_HOSTCMD_RESP_REPORT_ID */
 150         u8 cmd_id;
 151         u8 reserved_at_10;
 152
 153         union {
 154                 struct thunderstrike_hostcmd_board_info board_info;
 155                 struct thunderstrike_hostcmd_haptics motors;
 156                 __le16 fw_version;
 157                 enum thunderstrike_led_state led_state;
 158                 struct thunderstrike_hostcmd_battery battery;
 159                 struct thunderstrike_hostcmd_charger charger;
 160                 u8 payload[30];
 161         } __packed;
 162 } __packed;
 163 static_assert(sizeof(struct thunderstrike_hostcmd_resp_report) ==
 164               THUNDERSTRIKE_HOSTCMD_REPORT_SIZE);
 165
 166 struct thunderstrike_hostcmd_req_report {
 167         u8 report_id; /* THUNDERSTRIKE_HOSTCMD_REQ_REPORT_ID */
 168         u8 cmd_id;
 169         u8 reserved_at_10;
 170
 171         union {
 172                 struct __packed {
 173                         u8 update;
 174                         enum thunderstrike_led_state state;
 175                 } led;
 176                 struct __packed {
 177                         u8 update;
 178                         struct thunderstrike_hostcmd_haptics motors;
 179                 } haptics;
 180         } __packed;
 181         u8 reserved_at_30[27];
 182 } __packed;
 183 static_assert(sizeof(struct thunderstrike_hostcmd_req_report) ==
 184               THUNDERSTRIKE_HOSTCMD_REPORT_SIZE);
 185
 186 /* Common struct for shield accessories. */
 187 struct shield_device {
 188         struct hid_device *hdev;
 189         struct power_supply_dev battery_dev;
 190
 191         unsigned long initialized_flags;
 192         const char *codename;
 193         u16 fw_version;
 194         struct {
 195                 u16 revision;
 196                 char serial_number[15];
 197         } board_info;
 198 };
 199
 200 /*
 201  * Non-trivial to uniquely identify Thunderstrike controllers at initialization
 202  * time. Use an ID allocator to help with this.
 203  */
 204 static DEFINE_IDA(thunderstrike_ida);
 205
 206 struct thunderstrike {
 207         struct shield_device base;
 208
 209         int id;
 210
 211         /* Sub-devices */
 212         struct input_dev *haptics_dev;
 213         struct led_classdev led_dev;
 214
 215         /* Resources */
 216         void *req_report_dmabuf;
 217         unsigned long update_flags;
 218         struct thunderstrike_hostcmd_haptics haptics_val;
 219         spinlock_t haptics_update_lock;
 220         u8 led_state : 1;
 221         enum thunderstrike_led_state led_value;
 222         struct thunderstrike_psy_prop_values psy_stats;
 223         spinlock_t psy_stats_lock;
 224         struct timer_list psy_stats_timer;
 225         struct work_struct hostcmd_req_work;
 226 };
 227
 228 static inline void thunderstrike_hostcmd_req_report_init(
 229         struct thunderstrike_hostcmd_req_report *report, u8 cmd_id)
 230 {
 231         memset(report, 0, sizeof(*report));
 232         report->report_id = THUNDERSTRIKE_HOSTCMD_REQ_REPORT_ID;
 233         report->cmd_id = cmd_id;
 234 }
 235
 236 static inline void shield_strrev(char *dest, size_t len, u16 rev)
 237 {
 238         dest[0] = ('A' - 1) + (rev >> 8);
 239         snprintf(&dest[1], len - 1, "%02X", 0xff & rev);
 240 }
 241
 242 static struct input_dev *shield_allocate_input_dev(struct hid_device *hdev,
 243                                                    const char *name_suffix)
 244 {
 245         struct input_dev *idev;
 246
 247         idev = input_allocate_device();
 248         if (!idev)
 249                 goto err_device;
 250
 251         idev->id.bustype = hdev->bus;
 252         idev->id.vendor = hdev->vendor;
 253         idev->id.product = hdev->product;
 254         idev->id.version = hdev->version;
 255         idev->uniq = hdev->uniq;
 256         idev->name = devm_kasprintf(&hdev->dev, GFP_KERNEL, "%s %s", hdev->name,
 257                                     name_suffix);
 258         if (!idev->name)
 259                 goto err_name;
 260
 261         input_set_drvdata(idev, hdev);
 262
 263         return idev;
 264
 265 err_name:
 266         input_free_device(idev);
 267 err_device:
 268         return ERR_PTR(-ENOMEM);
 269 }
 270
 271 static struct input_dev *shield_haptics_create(
 272         struct shield_device *dev,
 273         int (*play_effect)(struct input_dev *, void *, struct ff_effect *))
 274 {
 275         struct input_dev *haptics;
 276         int ret;
 277
 278         if (!IS_ENABLED(CONFIG_NVIDIA_SHIELD_FF))
 279                 return NULL;
 280
 281         haptics = shield_allocate_input_dev(dev->hdev, "Haptics");
 282         if (IS_ERR(haptics))
 283                 return haptics;
 284
 285         input_set_capability(haptics, EV_FF, FF_RUMBLE);
 286         input_ff_create_memless(haptics, NULL, play_effect);
 287
 288         ret = input_register_device(haptics);
 289         if (ret)
 290                 goto err;
 291
 292         return haptics;
 293
 294 err:
 295         input_free_device(haptics);
 296         return ERR_PTR(ret);
 297 }
 298
 299 static inline void thunderstrike_send_hostcmd_request(struct thunderstrike *ts)
 300 {
 301         struct thunderstrike_hostcmd_req_report *report = ts->req_report_dmabuf;
 302         struct shield_device *shield_dev = &ts->base;
 303         int ret;
 304
 305         ret = hid_hw_raw_request(shield_dev->hdev, report->report_id,
 306                                  ts->req_report_dmabuf,
 307                                  THUNDERSTRIKE_HOSTCMD_REPORT_SIZE,
 308                                  HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
 309
 310         if (ret < 0) {
 311                 hid_err(shield_dev->hdev,
 312                         "Failed to output Thunderstrike HOSTCMD request HID report due to %pe\n",
 313                         ERR_PTR(ret));
 314         }
 315 }
 316
 317 static void thunderstrike_hostcmd_req_work_handler(struct work_struct *work)
 318 {
 319         struct thunderstrike *ts =
 320                 container_of(work, struct thunderstrike, hostcmd_req_work);
 321         struct thunderstrike_hostcmd_req_report *report;
 322         unsigned long flags;
 323
 324         report = ts->req_report_dmabuf;
 325
 326         if (test_and_clear_bit(THUNDERSTRIKE_FW_VERSION_UPDATE, &ts->update_flags)) {
 327                 thunderstrike_hostcmd_req_report_init(
 328                         report, THUNDERSTRIKE_HOSTCMD_ID_FW_VERSION);
 329                 thunderstrike_send_hostcmd_request(ts);
 330         }
 331
 332         if (test_and_clear_bit(THUNDERSTRIKE_LED_UPDATE, &ts->update_flags)) {
 333                 thunderstrike_hostcmd_req_report_init(report, THUNDERSTRIKE_HOSTCMD_ID_LED);
 334                 report->led.update = 1;
 335                 report->led.state = ts->led_value;
 336                 thunderstrike_send_hostcmd_request(ts);
 337         }
 338
 339         if (test_and_clear_bit(THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE, &ts->update_flags)) {
 340                 thunderstrike_hostcmd_req_report_init(
 341                         report, THUNDERSTRIKE_HOSTCMD_ID_BATTERY);
 342                 thunderstrike_send_hostcmd_request(ts);
 343
 344                 thunderstrike_hostcmd_req_report_init(
 345                         report, THUNDERSTRIKE_HOSTCMD_ID_CHARGER);
 346                 thunderstrike_send_hostcmd_request(ts);
 347         }
 348
 349         if (test_and_clear_bit(THUNDERSTRIKE_BOARD_INFO_UPDATE, &ts->update_flags)) {
 350                 thunderstrike_hostcmd_req_report_init(
 351                         report, THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO);
 352                 thunderstrike_send_hostcmd_request(ts);
 353         }
 354
 355         if (test_and_clear_bit(THUNDERSTRIKE_HAPTICS_UPDATE, &ts->update_flags)) {
 356                 thunderstrike_hostcmd_req_report_init(
 357                         report, THUNDERSTRIKE_HOSTCMD_ID_HAPTICS);
 358
 359                 report->haptics.update = 1;
 360                 spin_lock_irqsave(&ts->haptics_update_lock, flags);
 361                 report->haptics.motors = ts->haptics_val;
 362                 spin_unlock_irqrestore(&ts->haptics_update_lock, flags);
 363
 364                 thunderstrike_send_hostcmd_request(ts);
 365         }
 366 }
 367
 368 static inline void thunderstrike_request_firmware_version(struct thunderstrike *ts)
 369 {
 370         set_bit(THUNDERSTRIKE_FW_VERSION_UPDATE, &ts->update_flags);
 371         schedule_work(&ts->hostcmd_req_work);
 372 }
 373
 374 static inline void thunderstrike_request_board_info(struct thunderstrike *ts)
 375 {
 376         set_bit(THUNDERSTRIKE_BOARD_INFO_UPDATE, &ts->update_flags);
 377         schedule_work(&ts->hostcmd_req_work);
 378 }
 379
 380 static inline int
 381 thunderstrike_update_haptics(struct thunderstrike *ts,
 382                              struct thunderstrike_hostcmd_haptics *motors)
 383 {
 384         unsigned long flags;
 385
 386         spin_lock_irqsave(&ts->haptics_update_lock, flags);
 387         ts->haptics_val = *motors;
 388         spin_unlock_irqrestore(&ts->haptics_update_lock, flags);
 389
 390         set_bit(THUNDERSTRIKE_HAPTICS_UPDATE, &ts->update_flags);
 391         schedule_work(&ts->hostcmd_req_work);
 392
 393         return 0;
 394 }
 395
 396 static int thunderstrike_play_effect(struct input_dev *idev, void *data,
 397                                      struct ff_effect *effect)
 398 {
 399         struct hid_device *hdev = input_get_drvdata(idev);
 400         struct thunderstrike_hostcmd_haptics motors;
 401         struct shield_device *shield_dev;
 402         struct thunderstrike *ts;
 403
 404         if (effect->type != FF_RUMBLE)
 405                 return 0;
 406
 407         shield_dev = hid_get_drvdata(hdev);
 408         ts = container_of(shield_dev, struct thunderstrike, base);
 409
 410         /* Thunderstrike motor values range from 0 to 32 inclusively */
 411         motors.motor_left = effect->u.rumble.strong_magnitude / 2047;
 412         motors.motor_right = effect->u.rumble.weak_magnitude / 2047;
 413
 414         hid_dbg(hdev, "Thunderstrike FF_RUMBLE request, left: %u right: %u\n",
 415                 motors.motor_left, motors.motor_right);
 416
 417         return thunderstrike_update_haptics(ts, &motors);
 418 }
 419
 420 static enum led_brightness
 421 thunderstrike_led_get_brightness(struct led_classdev *led)
 422 {
 423         struct hid_device *hdev = to_hid_device(led->dev->parent);
 424         struct shield_device *shield_dev = hid_get_drvdata(hdev);
 425         struct thunderstrike *ts;
 426
 427         ts = container_of(shield_dev, struct thunderstrike, base);
 428
 429         return ts->led_state;
 430 }
 431
 432 static void thunderstrike_led_set_brightness(struct led_classdev *led,
 433                                             enum led_brightness value)
 434 {
 435         struct hid_device *hdev = to_hid_device(led->dev->parent);
 436         struct shield_device *shield_dev = hid_get_drvdata(hdev);
 437         struct thunderstrike *ts;
 438
 439         ts = container_of(shield_dev, struct thunderstrike, base);
 440
 441         switch (value) {
 442         case LED_OFF:
 443                 ts->led_value = THUNDERSTRIKE_LED_OFF;
 444                 break;
 445         default:
 446                 ts->led_value = THUNDERSTRIKE_LED_ON;
 447                 break;
 448         }
 449
 450         set_bit(THUNDERSTRIKE_LED_UPDATE, &ts->update_flags);
 451         schedule_work(&ts->hostcmd_req_work);
 452 }
 453
 454 static int thunderstrike_battery_get_property(struct power_supply *psy,
 455                                               enum power_supply_property psp,
 456                                               union power_supply_propval *val)
 457 {
 458         struct shield_device *shield_dev = power_supply_get_drvdata(psy);
 459         struct thunderstrike_psy_prop_values prop_values;
 460         struct thunderstrike *ts;
 461         int ret = 0;
 462
 463         ts = container_of(shield_dev, struct thunderstrike, base);
 464         spin_lock(&ts->psy_stats_lock);
 465         prop_values = ts->psy_stats;
 466         spin_unlock(&ts->psy_stats_lock);
 467
 468         switch (psp) {
 469         case POWER_SUPPLY_PROP_STATUS:
 470                 val->intval = prop_values.status;
 471                 break;
 472         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 473                 val->intval = prop_values.charge_type;
 474                 break;
 475         case POWER_SUPPLY_PROP_PRESENT:
 476                 val->intval = 1;
 477                 break;
 478         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 479                 val->intval = prop_values.voltage_min;
 480                 break;
 481         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 482                 val->intval = 2900000; /* 2.9 V */
 483                 break;
 484         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 485                 val->intval = 2200000; /* 2.2 V */
 486                 break;
 487         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 488                 val->intval = prop_values.voltage_now;
 489                 break;
 490         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
 491                 val->intval = prop_values.voltage_avg;
 492                 break;
 493         case POWER_SUPPLY_PROP_VOLTAGE_BOOT:
 494                 val->intval = prop_values.voltage_boot;
 495                 break;
 496         case POWER_SUPPLY_PROP_CAPACITY:
 497                 val->intval = prop_values.capacity;
 498                 break;
 499         case POWER_SUPPLY_PROP_SCOPE:
 500                 val->intval = POWER_SUPPLY_SCOPE_DEVICE;
 501                 break;
 502         case POWER_SUPPLY_PROP_TEMP:
 503                 val->intval = prop_values.temp;
 504                 break;
 505         case POWER_SUPPLY_PROP_TEMP_MIN:
 506                 val->intval = 0; /* 0 C */
 507                 break;
 508         case POWER_SUPPLY_PROP_TEMP_MAX:
 509                 val->intval = 400; /* 40 C */
 510                 break;
 511         case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
 512                 val->intval = 15; /* 1.5 C */
 513                 break;
 514         case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
 515                 val->intval = 380; /* 38 C */
 516                 break;
 517         default:
 518                 ret = -EINVAL;
 519                 break;
 520         }
 521
 522         return ret;
 523 }
 524
 525 static inline void thunderstrike_request_psy_stats(struct thunderstrike *ts)
 526 {
 527         set_bit(THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE, &ts->update_flags);
 528         schedule_work(&ts->hostcmd_req_work);
 529 }
 530
 531 static void thunderstrike_psy_stats_timer_handler(struct timer_list *timer)
 532 {
 533         struct thunderstrike *ts =
 534                 container_of(timer, struct thunderstrike, psy_stats_timer);
 535
 536         thunderstrike_request_psy_stats(ts);
 537         /* Query battery statistics from device every five minutes */
 538         mod_timer(timer, jiffies + 300 * HZ);
 539 }
 540
 541 static void
 542 thunderstrike_parse_fw_version_payload(struct shield_device *shield_dev,
 543                                        __le16 fw_version)
 544 {
 545         shield_dev->fw_version = le16_to_cpu(fw_version);
 546
 547         set_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags);
 548
 549         hid_dbg(shield_dev->hdev, "Thunderstrike firmware version 0x%04X\n",
 550                 shield_dev->fw_version);
 551 }
 552
 553 static void
 554 thunderstrike_parse_board_info_payload(struct shield_device *shield_dev,
 555                                        struct thunderstrike_hostcmd_board_info *board_info)
 556 {
 557         char board_revision_str[4];
 558         int i;
 559
 560         shield_dev->board_info.revision = le16_to_cpu(board_info->revision);
 561         for (i = 0; i < 7; ++i) {
 562                 u16 val = le16_to_cpu(board_info->serial[i]);
 563
 564                 shield_dev->board_info.serial_number[2 * i] = val & 0xFF;
 565                 shield_dev->board_info.serial_number[2 * i + 1] = val >> 8;
 566         }
 567         shield_dev->board_info.serial_number[14] = '\0';
 568
 569         set_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags);
 570
 571         shield_strrev(board_revision_str, 4, shield_dev->board_info.revision);
 572         hid_dbg(shield_dev->hdev,
 573                 "Thunderstrike BOARD_REVISION_%s (0x%04X) S/N: %s\n",
 574                 board_revision_str, shield_dev->board_info.revision,
 575                 shield_dev->board_info.serial_number);
 576 }
 577
 578 static inline void
 579 thunderstrike_parse_haptics_payload(struct shield_device *shield_dev,
 580                                     struct thunderstrike_hostcmd_haptics *haptics)
 581 {
 582         hid_dbg(shield_dev->hdev,
 583                 "Thunderstrike haptics HOSTCMD response, left: %u right: %u\n",
 584                 haptics->motor_left, haptics->motor_right);
 585 }
 586
 587 static void
 588 thunderstrike_parse_led_payload(struct shield_device *shield_dev,
 589                                 enum thunderstrike_led_state led_state)
 590 {
 591         struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
 592
 593         switch (led_state) {
 594         case THUNDERSTRIKE_LED_OFF:
 595                 ts->led_state = 0;
 596                 break;
 597         case THUNDERSTRIKE_LED_ON:
 598                 ts->led_state = 1;
 599                 break;
 600         }
 601
 602         hid_dbg(shield_dev->hdev, "Thunderstrike led HOSTCMD response, 0x%02X\n", led_state);
 603 }
 604
 605 static void thunderstrike_parse_battery_payload(
 606         struct shield_device *shield_dev,
 607         struct thunderstrike_hostcmd_battery *battery)
 608 {
 609         struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
 610         u16 hostcmd_voltage_boot = le16_to_cpu(battery->voltage_boot);
 611         u16 hostcmd_voltage_avg = le16_to_cpu(battery->voltage_avg);
 612         u16 hostcmd_voltage_min = le16_to_cpu(battery->voltage_min);
 613         u16 hostcmd_voltage_now = le16_to_cpu(battery->voltage_now);
 614         u16 hostcmd_thermistor = le16_to_cpu(battery->thermistor);
 615         int voltage_boot, voltage_avg, voltage_min, voltage_now;
 616         struct hid_device *hdev = shield_dev->hdev;
 617         u8 capacity = battery->capacity;
 618         int temp;
 619
 620         /* Convert thunderstrike device values to µV and tenths of degree Celsius */
 621         voltage_boot = hostcmd_voltage_boot * 1000;
 622         voltage_avg = hostcmd_voltage_avg * 1000;
 623         voltage_min = hostcmd_voltage_min * 1000;
 624         voltage_now = hostcmd_voltage_now * 1000;
 625         temp = (1378 - (int)hostcmd_thermistor) * 10 / 19;
 626
 627         /* Copy converted values */
 628         spin_lock(&ts->psy_stats_lock);
 629         ts->psy_stats.voltage_boot = voltage_boot;
 630         ts->psy_stats.voltage_avg = voltage_avg;
 631         ts->psy_stats.voltage_min = voltage_min;
 632         ts->psy_stats.voltage_now = voltage_now;
 633         ts->psy_stats.capacity = capacity;
 634         ts->psy_stats.temp = temp;
 635         spin_unlock(&ts->psy_stats_lock);
 636
 637         set_bit(SHIELD_BATTERY_STATS_INITIALIZED, &shield_dev->initialized_flags);
 638
 639         hid_dbg(hdev,
 640                 "Thunderstrike battery HOSTCMD response, voltage_avg: %u voltage_now: %u\n",
 641                 hostcmd_voltage_avg, hostcmd_voltage_now);
 642         hid_dbg(hdev,
 643                 "Thunderstrike battery HOSTCMD response, voltage_boot: %u voltage_min: %u\n",
 644                 hostcmd_voltage_boot, hostcmd_voltage_min);
 645         hid_dbg(hdev,
 646                 "Thunderstrike battery HOSTCMD response, thermistor: %u\n",
 647                 hostcmd_thermistor);
 648         hid_dbg(hdev,
 649                 "Thunderstrike battery HOSTCMD response, capacity: %u%%\n",
 650                 capacity);
 651 }
 652
 653 static void thunderstrike_parse_charger_payload(
 654         struct shield_device *shield_dev,
 655         struct thunderstrike_hostcmd_charger *charger)
 656 {
 657         struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
 658         int charge_type = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
 659         struct hid_device *hdev = shield_dev->hdev;
 660         int status = POWER_SUPPLY_STATUS_UNKNOWN;
 661
 662         switch (charger->type) {
 663         case THUNDERSTRIKE_CHARGER_TYPE_NONE:
 664                 charge_type = POWER_SUPPLY_CHARGE_TYPE_NONE;
 665                 break;
 666         case THUNDERSTRIKE_CHARGER_TYPE_TRICKLE:
 667                 charge_type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 668                 break;
 669         case THUNDERSTRIKE_CHARGER_TYPE_NORMAL:
 670                 charge_type = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
 671                 break;
 672         default:
 673                 hid_warn(hdev, "Unhandled Thunderstrike charger HOSTCMD type, %u\n",
 674                          charger->type);
 675                 break;
 676         }
 677
 678         switch (charger->state) {
 679         case THUNDERSTRIKE_CHARGER_STATE_UNKNOWN:
 680                 status = POWER_SUPPLY_STATUS_UNKNOWN;
 681                 break;
 682         case THUNDERSTRIKE_CHARGER_STATE_DISABLED:
 683                 /* Indicates charger is disconnected */
 684                 break;
 685         case THUNDERSTRIKE_CHARGER_STATE_CHARGING:
 686                 status = POWER_SUPPLY_STATUS_CHARGING;
 687                 break;
 688         case THUNDERSTRIKE_CHARGER_STATE_FULL:
 689                 status = POWER_SUPPLY_STATUS_FULL;
 690                 break;
 691         case THUNDERSTRIKE_CHARGER_STATE_FAILED:
 692                 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 693                 hid_err(hdev, "Thunderstrike device failed to charge\n");
 694                 break;
 695         default:
 696                 hid_warn(hdev, "Unhandled Thunderstrike charger HOSTCMD state, %u\n",
 697                          charger->state);
 698                 break;
 699         }
 700
 701         if (!charger->connected)
 702                 status = POWER_SUPPLY_STATUS_DISCHARGING;
 703
 704         spin_lock(&ts->psy_stats_lock);
 705         ts->psy_stats.charge_type = charge_type;
 706         ts->psy_stats.status = status;
 707         spin_unlock(&ts->psy_stats_lock);
 708
 709         set_bit(SHIELD_CHARGER_STATE_INITIALIZED, &shield_dev->initialized_flags);
 710
 711         hid_dbg(hdev,
 712                 "Thunderstrike charger HOSTCMD response, connected: %u, type: %u, state: %u\n",
 713                 charger->connected, charger->type, charger->state);
 714 }
 715
 716 static inline void thunderstrike_device_init_info(struct shield_device *shield_dev)
 717 {
 718         struct thunderstrike *ts =
 719                 container_of(shield_dev, struct thunderstrike, base);
 720
 721         if (!test_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags))
 722                 thunderstrike_request_firmware_version(ts);
 723
 724         if (!test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags))
 725                 thunderstrike_request_board_info(ts);
 726
 727         if (!test_bit(SHIELD_BATTERY_STATS_INITIALIZED, &shield_dev->initialized_flags) ||
 728             !test_bit(SHIELD_CHARGER_STATE_INITIALIZED, &shield_dev->initialized_flags))
 729                 thunderstrike_psy_stats_timer_handler(&ts->psy_stats_timer);
 730 }
 731
 732 static int thunderstrike_parse_report(struct shield_device *shield_dev,
 733                                       struct hid_report *report, u8 *data,
 734                                       int size)
 735 {
 736         struct thunderstrike_hostcmd_resp_report *hostcmd_resp_report;
 737         struct hid_device *hdev = shield_dev->hdev;
 738
 739         switch (report->id) {
 740         case THUNDERSTRIKE_HOSTCMD_RESP_REPORT_ID:
 741                 if (size != THUNDERSTRIKE_HOSTCMD_REPORT_SIZE) {
 742                         hid_err(hdev,
 743                                 "Encountered Thunderstrike HOSTCMD HID report with unexpected size %d\n",
 744                                 size);
 745                         return -EINVAL;
 746                 }
 747
 748                 hostcmd_resp_report =
 749                         (struct thunderstrike_hostcmd_resp_report *)data;
 750
 751                 switch (hostcmd_resp_report->cmd_id) {
 752                 case THUNDERSTRIKE_HOSTCMD_ID_FW_VERSION:
 753                         thunderstrike_parse_fw_version_payload(
 754                                 shield_dev, hostcmd_resp_report->fw_version);
 755                         break;
 756                 case THUNDERSTRIKE_HOSTCMD_ID_LED:
 757                         thunderstrike_parse_led_payload(shield_dev, hostcmd_resp_report->led_state);
 758                         break;
 759                 case THUNDERSTRIKE_HOSTCMD_ID_BATTERY:
 760                         thunderstrike_parse_battery_payload(shield_dev,
 761                                                             &hostcmd_resp_report->battery);
 762                         break;
 763                 case THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO:
 764                         thunderstrike_parse_board_info_payload(
 765                                 shield_dev, &hostcmd_resp_report->board_info);
 766                         break;
 767                 case THUNDERSTRIKE_HOSTCMD_ID_HAPTICS:
 768                         thunderstrike_parse_haptics_payload(
 769                                 shield_dev, &hostcmd_resp_report->motors);
 770                         break;
 771                 case THUNDERSTRIKE_HOSTCMD_ID_USB_INIT:
 772                         /* May block HOSTCMD requests till received initially */
 773                         thunderstrike_device_init_info(shield_dev);
 774                         break;
 775                 case THUNDERSTRIKE_HOSTCMD_ID_CHARGER:
 776                         /* May block HOSTCMD requests till received initially */
 777                         thunderstrike_device_init_info(shield_dev);
 778
 779                         thunderstrike_parse_charger_payload(
 780                                 shield_dev, &hostcmd_resp_report->charger);
 781                         break;
 782                 default:
 783                         hid_warn(hdev,
 784                                  "Unhandled Thunderstrike HOSTCMD id %d\n",
 785                                  hostcmd_resp_report->cmd_id);
 786                         return -ENOENT;
 787                 }
 788
 789                 break;
 790         default:
 791                 return 0;
 792         }
 793
 794         return 0;
 795 }
 796
 797 static inline int thunderstrike_led_create(struct thunderstrike *ts)
 798 {
 799         struct led_classdev *led = &ts->led_dev;
 800
 801         led->name = devm_kasprintf(&ts->base.hdev->dev, GFP_KERNEL,
 802                                    "thunderstrike%d:blue:led", ts->id);
 803         led->max_brightness = 1;
 804         led->flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN;
 805         led->brightness_get = &thunderstrike_led_get_brightness;
 806         led->brightness_set = &thunderstrike_led_set_brightness;
 807
 808         return led_classdev_register(&ts->base.hdev->dev, led);
 809 }
 810
 811 static inline int thunderstrike_psy_create(struct shield_device *shield_dev)
 812 {
 813         struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
 814         struct power_supply_config psy_cfg = { .drv_data = shield_dev, };
 815         struct hid_device *hdev = shield_dev->hdev;
 816         int ret;
 817
 818         /*
 819          * Set an initial capacity and temperature value to avoid prematurely
 820          * triggering alerts. Will be replaced by values queried from initial
 821          * HOSTCMD requests.
 822          */
 823         ts->psy_stats.capacity = 100;
 824         ts->psy_stats.temp = 182;
 825
 826         shield_dev->battery_dev.desc.properties = thunderstrike_battery_props;
 827         shield_dev->battery_dev.desc.num_properties =
 828                 ARRAY_SIZE(thunderstrike_battery_props);
 829         shield_dev->battery_dev.desc.get_property = thunderstrike_battery_get_property;
 830         shield_dev->battery_dev.desc.type = POWER_SUPPLY_TYPE_BATTERY;
 831         shield_dev->battery_dev.desc.name =
 832                 devm_kasprintf(&ts->base.hdev->dev, GFP_KERNEL,
 833                                "thunderstrike_%d", ts->id);
 834
 835         shield_dev->battery_dev.psy = power_supply_register(
 836                 &hdev->dev, &shield_dev->battery_dev.desc, &psy_cfg);
 837         if (IS_ERR(shield_dev->battery_dev.psy)) {
 838                 hid_err(hdev, "Failed to register Thunderstrike battery device\n");
 839                 return PTR_ERR(shield_dev->battery_dev.psy);
 840         }
 841
 842         ret = power_supply_powers(shield_dev->battery_dev.psy, &hdev->dev);
 843         if (ret) {
 844                 hid_err(hdev, "Failed to associate battery device to Thunderstrike\n");
 845                 goto err;
 846         }
 847
 848         return 0;
 849
 850 err:
 851         power_supply_unregister(shield_dev->battery_dev.psy);
 852         return ret;
 853 }
 854
 855 static struct shield_device *thunderstrike_create(struct hid_device *hdev)
 856 {
 857         struct shield_device *shield_dev;
 858         struct thunderstrike *ts;
 859         int ret;
 860
 861         ts = devm_kzalloc(&hdev->dev, sizeof(*ts), GFP_KERNEL);
 862         if (!ts)
 863                 return ERR_PTR(-ENOMEM);
 864
 865         ts->req_report_dmabuf = devm_kzalloc(
 866                 &hdev->dev, THUNDERSTRIKE_HOSTCMD_REPORT_SIZE, GFP_KERNEL);
 867         if (!ts->req_report_dmabuf)
 868                 return ERR_PTR(-ENOMEM);
 869
 870         shield_dev = &ts->base;
 871         shield_dev->hdev = hdev;
 872         shield_dev->codename = "Thunderstrike";
 873
 874         spin_lock_init(&ts->haptics_update_lock);
 875         spin_lock_init(&ts->psy_stats_lock);
 876         INIT_WORK(&ts->hostcmd_req_work, thunderstrike_hostcmd_req_work_handler);
 877
 878         hid_set_drvdata(hdev, shield_dev);
 879
 880         ts->id = ida_alloc(&thunderstrike_ida, GFP_KERNEL);
 881         if (ts->id < 0)
 882                 return ERR_PTR(ts->id);
 883
 884         ts->haptics_dev = shield_haptics_create(shield_dev, thunderstrike_play_effect);
 885         if (IS_ERR(ts->haptics_dev)) {
 886                 hid_err(hdev, "Failed to create Thunderstrike haptics instance\n");
 887                 ret = PTR_ERR(ts->haptics_dev);
 888                 goto err_id;
 889         }
 890
 891         ret = thunderstrike_psy_create(shield_dev);
 892         if (ret) {
 893                 hid_err(hdev, "Failed to create Thunderstrike power supply instance\n");
 894                 goto err_haptics;
 895         }
 896
 897         ret = thunderstrike_led_create(ts);
 898         if (ret) {
 899                 hid_err(hdev, "Failed to create Thunderstrike LED instance\n");
 900                 goto err_psy;
 901         }
 902
 903         timer_setup(&ts->psy_stats_timer, thunderstrike_psy_stats_timer_handler, 0);
 904
 905         hid_info(hdev, "Registered Thunderstrike controller\n");
 906         return shield_dev;
 907
 908 err_psy:
 909         power_supply_unregister(shield_dev->battery_dev.psy);
 910 err_haptics:
 911         if (ts->haptics_dev)
 912                 input_unregister_device(ts->haptics_dev);
 913 err_id:
 914         ida_free(&thunderstrike_ida, ts->id);
 915         return ERR_PTR(ret);
 916 }
 917
 918 static int android_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 919                                  struct hid_field *field,
 920                                  struct hid_usage *usage, unsigned long **bit,
 921                                  int *max)
 922 {
 923         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
 924                 return 0;
 925
 926         switch (usage->hid & HID_USAGE) {
 927         case HID_USAGE_ANDROID_PLAYPAUSE_BTN:
 928                 android_map_key(KEY_PLAYPAUSE);
 929                 break;
 930         case HID_USAGE_ANDROID_VOLUMEUP_BTN:
 931                 android_map_key(KEY_VOLUMEUP);
 932                 break;
 933         case HID_USAGE_ANDROID_VOLUMEDOWN_BTN:
 934                 android_map_key(KEY_VOLUMEDOWN);
 935                 break;
 936         case HID_USAGE_ANDROID_SEARCH_BTN:
 937                 android_map_key(BTN_Z);
 938                 break;
 939         case HID_USAGE_ANDROID_HOME_BTN:
 940                 android_map_key(BTN_MODE);
 941                 break;
 942         case HID_USAGE_ANDROID_BACK_BTN:
 943                 android_map_key(BTN_SELECT);
 944                 break;
 945         default:
 946                 return 0;
 947         }
 948
 949         return 1;
 950 }
 951
 952 static ssize_t firmware_version_show(struct device *dev,
 953                                      struct device_attribute *attr, char *buf)
 954 {
 955         struct hid_device *hdev = to_hid_device(dev);
 956         struct shield_device *shield_dev;
 957         int ret;
 958
 959         shield_dev = hid_get_drvdata(hdev);
 960
 961         if (test_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags))
 962                 ret = sysfs_emit(buf, "0x%04X\n", shield_dev->fw_version);
 963         else
 964                 ret = sysfs_emit(buf, NOT_INIT_STR "\n");
 965
 966         return ret;
 967 }
 968
 969 static DEVICE_ATTR_RO(firmware_version);
 970
 971 static ssize_t hardware_version_show(struct device *dev,
 972                                      struct device_attribute *attr, char *buf)
 973 {
 974         struct hid_device *hdev = to_hid_device(dev);
 975         struct shield_device *shield_dev;
 976         char board_revision_str[4];
 977         int ret;
 978
 979         shield_dev = hid_get_drvdata(hdev);
 980
 981         if (test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags)) {
 982                 shield_strrev(board_revision_str, 4, shield_dev->board_info.revision);
 983                 ret = sysfs_emit(buf, "%s BOARD_REVISION_%s (0x%04X)\n",
 984                                  shield_dev->codename, board_revision_str,
 985                                  shield_dev->board_info.revision);
 986         } else
 987                 ret = sysfs_emit(buf, NOT_INIT_STR "\n");
 988
 989         return ret;
 990 }
 991
 992 static DEVICE_ATTR_RO(hardware_version);
 993
 994 static ssize_t serial_number_show(struct device *dev,
 995                                   struct device_attribute *attr, char *buf)
 996 {
 997         struct hid_device *hdev = to_hid_device(dev);
 998         struct shield_device *shield_dev;
 999         int ret;
1000
1001         shield_dev = hid_get_drvdata(hdev);
1002
1003         if (test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags))
1004                 ret = sysfs_emit(buf, "%s\n", shield_dev->board_info.serial_number);
1005         else
1006                 ret = sysfs_emit(buf, NOT_INIT_STR "\n");
1007
1008         return ret;
1009 }
1010
1011 static DEVICE_ATTR_RO(serial_number);
1012
1013 static struct attribute *shield_device_attrs[] = {
1014         &dev_attr_firmware_version.attr,
1015         &dev_attr_hardware_version.attr,
1016         &dev_attr_serial_number.attr,
1017         NULL,
1018 };
1019 ATTRIBUTE_GROUPS(shield_device);
1020
1021 static int shield_raw_event(struct hid_device *hdev, struct hid_report *report,
1022                             u8 *data, int size)
1023 {
1024         struct shield_device *dev = hid_get_drvdata(hdev);
1025
1026         return thunderstrike_parse_report(dev, report, data, size);
1027 }
1028
1029 static int shield_probe(struct hid_device *hdev, const struct hid_device_id *id)
1030 {
1031         struct shield_device *shield_dev = NULL;
1032         struct thunderstrike *ts;
1033         int ret;
1034
1035         ret = hid_parse(hdev);
1036         if (ret) {
1037                 hid_err(hdev, "Parse failed\n");
1038                 return ret;
1039         }
1040
1041         switch (id->product) {
1042         case USB_DEVICE_ID_NVIDIA_THUNDERSTRIKE_CONTROLLER:
1043                 shield_dev = thunderstrike_create(hdev);
1044                 break;
1045         }
1046
1047         if (unlikely(!shield_dev)) {
1048                 hid_err(hdev, "Failed to identify SHIELD device\n");
1049                 return -ENODEV;
1050         }
1051         if (IS_ERR(shield_dev)) {
1052                 hid_err(hdev, "Failed to create SHIELD device\n");
1053                 return PTR_ERR(shield_dev);
1054         }
1055
1056         ts = container_of(shield_dev, struct thunderstrike, base);
1057
1058         ret = hid_hw_start(hdev, HID_CONNECT_HIDINPUT);
1059         if (ret) {
1060                 hid_err(hdev, "Failed to start HID device\n");
1061                 goto err_ts_create;
1062         }
1063
1064         ret = hid_hw_open(hdev);
1065         if (ret) {
1066                 hid_err(hdev, "Failed to open HID device\n");
1067                 goto err_stop;
1068         }
1069
1070         thunderstrike_device_init_info(shield_dev);
1071
1072         return ret;
1073
1074 err_stop:
1075         hid_hw_stop(hdev);
1076 err_ts_create:
1077         power_supply_unregister(ts->base.battery_dev.psy);
1078         if (ts->haptics_dev)
1079                 input_unregister_device(ts->haptics_dev);
1080         led_classdev_unregister(&ts->led_dev);
1081         ida_free(&thunderstrike_ida, ts->id);
1082         return ret;
1083 }
1084
1085 static void shield_remove(struct hid_device *hdev)
1086 {
1087         struct shield_device *dev = hid_get_drvdata(hdev);
1088         struct thunderstrike *ts;
1089
1090         ts = container_of(dev, struct thunderstrike, base);
1091
1092         hid_hw_close(hdev);
1093         power_supply_unregister(dev->battery_dev.psy);
1094         if (ts->haptics_dev)
1095                 input_unregister_device(ts->haptics_dev);
1096         led_classdev_unregister(&ts->led_dev);
1097         ida_free(&thunderstrike_ida, ts->id);
1098         del_timer_sync(&ts->psy_stats_timer);
1099         cancel_work_sync(&ts->hostcmd_req_work);
1100         hid_hw_stop(hdev);
1101 }
1102
1103 static const struct hid_device_id shield_devices[] = {
1104         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NVIDIA,
1105                                USB_DEVICE_ID_NVIDIA_THUNDERSTRIKE_CONTROLLER) },
1106         { HID_USB_DEVICE(USB_VENDOR_ID_NVIDIA,
1107                          USB_DEVICE_ID_NVIDIA_THUNDERSTRIKE_CONTROLLER) },
1108         { }
1109 };
1110 MODULE_DEVICE_TABLE(hid, shield_devices);
1111
1112 static struct hid_driver shield_driver = {
1113         .name          = "shield",
1114         .id_table      = shield_devices,
1115         .input_mapping = android_input_mapping,
1116         .probe         = shield_probe,
1117         .remove        = shield_remove,
1118         .raw_event     = shield_raw_event,
1119         .driver = {
1120                 .dev_groups = shield_device_groups,
1121         },
1122 };
1123 module_hid_driver(shield_driver);
1124
1125 MODULE_AUTHOR("Rahul Rameshbabu <rrameshbabu@nvidia.com>");
1126 MODULE_DESCRIPTION("HID Driver for NVIDIA SHIELD peripherals.");
1127 MODULE_LICENSE("GPL");