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
thunderstrike_hostcmd_req_report_init(struct thunderstrike_hostcmd_req_report * report,u8 cmd_id)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
shield_strrev(char * dest,size_t len,u16 rev)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
shield_allocate_input_dev(struct hid_device * hdev,const char * name_suffix)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
shield_haptics_create(struct shield_device * dev,int (* play_effect)(struct input_dev *,void *,struct ff_effect *))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 ret = input_ff_create_memless(haptics, NULL, play_effect);
287 if (ret)
288 goto err;
289
290 ret = input_register_device(haptics);
291 if (ret)
292 goto err;
293
294 return haptics;
295
296 err:
297 input_free_device(haptics);
298 return ERR_PTR(ret);
299 }
300
thunderstrike_send_hostcmd_request(struct thunderstrike * ts)301 static inline void thunderstrike_send_hostcmd_request(struct thunderstrike *ts)
302 {
303 struct thunderstrike_hostcmd_req_report *report = ts->req_report_dmabuf;
304 struct shield_device *shield_dev = &ts->base;
305 int ret;
306
307 ret = hid_hw_raw_request(shield_dev->hdev, report->report_id,
308 ts->req_report_dmabuf,
309 THUNDERSTRIKE_HOSTCMD_REPORT_SIZE,
310 HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
311
312 if (ret < 0) {
313 hid_err(shield_dev->hdev,
314 "Failed to output Thunderstrike HOSTCMD request HID report due to %pe\n",
315 ERR_PTR(ret));
316 }
317 }
318
thunderstrike_hostcmd_req_work_handler(struct work_struct * work)319 static void thunderstrike_hostcmd_req_work_handler(struct work_struct *work)
320 {
321 struct thunderstrike *ts =
322 container_of(work, struct thunderstrike, hostcmd_req_work);
323 struct thunderstrike_hostcmd_req_report *report;
324 unsigned long flags;
325
326 report = ts->req_report_dmabuf;
327
328 if (test_and_clear_bit(THUNDERSTRIKE_FW_VERSION_UPDATE, &ts->update_flags)) {
329 thunderstrike_hostcmd_req_report_init(
330 report, THUNDERSTRIKE_HOSTCMD_ID_FW_VERSION);
331 thunderstrike_send_hostcmd_request(ts);
332 }
333
334 if (test_and_clear_bit(THUNDERSTRIKE_LED_UPDATE, &ts->update_flags)) {
335 thunderstrike_hostcmd_req_report_init(report, THUNDERSTRIKE_HOSTCMD_ID_LED);
336 report->led.update = 1;
337 report->led.state = ts->led_value;
338 thunderstrike_send_hostcmd_request(ts);
339 }
340
341 if (test_and_clear_bit(THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE, &ts->update_flags)) {
342 thunderstrike_hostcmd_req_report_init(
343 report, THUNDERSTRIKE_HOSTCMD_ID_BATTERY);
344 thunderstrike_send_hostcmd_request(ts);
345
346 thunderstrike_hostcmd_req_report_init(
347 report, THUNDERSTRIKE_HOSTCMD_ID_CHARGER);
348 thunderstrike_send_hostcmd_request(ts);
349 }
350
351 if (test_and_clear_bit(THUNDERSTRIKE_BOARD_INFO_UPDATE, &ts->update_flags)) {
352 thunderstrike_hostcmd_req_report_init(
353 report, THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO);
354 thunderstrike_send_hostcmd_request(ts);
355 }
356
357 if (test_and_clear_bit(THUNDERSTRIKE_HAPTICS_UPDATE, &ts->update_flags)) {
358 thunderstrike_hostcmd_req_report_init(
359 report, THUNDERSTRIKE_HOSTCMD_ID_HAPTICS);
360
361 report->haptics.update = 1;
362 spin_lock_irqsave(&ts->haptics_update_lock, flags);
363 report->haptics.motors = ts->haptics_val;
364 spin_unlock_irqrestore(&ts->haptics_update_lock, flags);
365
366 thunderstrike_send_hostcmd_request(ts);
367 }
368 }
369
thunderstrike_request_firmware_version(struct thunderstrike * ts)370 static inline void thunderstrike_request_firmware_version(struct thunderstrike *ts)
371 {
372 set_bit(THUNDERSTRIKE_FW_VERSION_UPDATE, &ts->update_flags);
373 schedule_work(&ts->hostcmd_req_work);
374 }
375
thunderstrike_request_board_info(struct thunderstrike * ts)376 static inline void thunderstrike_request_board_info(struct thunderstrike *ts)
377 {
378 set_bit(THUNDERSTRIKE_BOARD_INFO_UPDATE, &ts->update_flags);
379 schedule_work(&ts->hostcmd_req_work);
380 }
381
382 static inline int
thunderstrike_update_haptics(struct thunderstrike * ts,struct thunderstrike_hostcmd_haptics * motors)383 thunderstrike_update_haptics(struct thunderstrike *ts,
384 struct thunderstrike_hostcmd_haptics *motors)
385 {
386 unsigned long flags;
387
388 spin_lock_irqsave(&ts->haptics_update_lock, flags);
389 ts->haptics_val = *motors;
390 spin_unlock_irqrestore(&ts->haptics_update_lock, flags);
391
392 set_bit(THUNDERSTRIKE_HAPTICS_UPDATE, &ts->update_flags);
393 schedule_work(&ts->hostcmd_req_work);
394
395 return 0;
396 }
397
thunderstrike_play_effect(struct input_dev * idev,void * data,struct ff_effect * effect)398 static int thunderstrike_play_effect(struct input_dev *idev, void *data,
399 struct ff_effect *effect)
400 {
401 struct hid_device *hdev = input_get_drvdata(idev);
402 struct thunderstrike_hostcmd_haptics motors;
403 struct shield_device *shield_dev;
404 struct thunderstrike *ts;
405
406 if (effect->type != FF_RUMBLE)
407 return 0;
408
409 shield_dev = hid_get_drvdata(hdev);
410 ts = container_of(shield_dev, struct thunderstrike, base);
411
412 /* Thunderstrike motor values range from 0 to 32 inclusively */
413 motors.motor_left = effect->u.rumble.strong_magnitude / 2047;
414 motors.motor_right = effect->u.rumble.weak_magnitude / 2047;
415
416 hid_dbg(hdev, "Thunderstrike FF_RUMBLE request, left: %u right: %u\n",
417 motors.motor_left, motors.motor_right);
418
419 return thunderstrike_update_haptics(ts, &motors);
420 }
421
422 static enum led_brightness
thunderstrike_led_get_brightness(struct led_classdev * led)423 thunderstrike_led_get_brightness(struct led_classdev *led)
424 {
425 struct hid_device *hdev = to_hid_device(led->dev->parent);
426 struct shield_device *shield_dev = hid_get_drvdata(hdev);
427 struct thunderstrike *ts;
428
429 ts = container_of(shield_dev, struct thunderstrike, base);
430
431 return ts->led_state;
432 }
433
thunderstrike_led_set_brightness(struct led_classdev * led,enum led_brightness value)434 static void thunderstrike_led_set_brightness(struct led_classdev *led,
435 enum led_brightness value)
436 {
437 struct hid_device *hdev = to_hid_device(led->dev->parent);
438 struct shield_device *shield_dev = hid_get_drvdata(hdev);
439 struct thunderstrike *ts;
440
441 ts = container_of(shield_dev, struct thunderstrike, base);
442
443 switch (value) {
444 case LED_OFF:
445 ts->led_value = THUNDERSTRIKE_LED_OFF;
446 break;
447 default:
448 ts->led_value = THUNDERSTRIKE_LED_ON;
449 break;
450 }
451
452 set_bit(THUNDERSTRIKE_LED_UPDATE, &ts->update_flags);
453 schedule_work(&ts->hostcmd_req_work);
454 }
455
thunderstrike_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)456 static int thunderstrike_battery_get_property(struct power_supply *psy,
457 enum power_supply_property psp,
458 union power_supply_propval *val)
459 {
460 struct shield_device *shield_dev = power_supply_get_drvdata(psy);
461 struct thunderstrike_psy_prop_values prop_values;
462 struct thunderstrike *ts;
463 int ret = 0;
464
465 ts = container_of(shield_dev, struct thunderstrike, base);
466 spin_lock(&ts->psy_stats_lock);
467 prop_values = ts->psy_stats;
468 spin_unlock(&ts->psy_stats_lock);
469
470 switch (psp) {
471 case POWER_SUPPLY_PROP_STATUS:
472 val->intval = prop_values.status;
473 break;
474 case POWER_SUPPLY_PROP_CHARGE_TYPE:
475 val->intval = prop_values.charge_type;
476 break;
477 case POWER_SUPPLY_PROP_PRESENT:
478 val->intval = 1;
479 break;
480 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
481 val->intval = prop_values.voltage_min;
482 break;
483 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
484 val->intval = 2900000; /* 2.9 V */
485 break;
486 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
487 val->intval = 2200000; /* 2.2 V */
488 break;
489 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
490 val->intval = prop_values.voltage_now;
491 break;
492 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
493 val->intval = prop_values.voltage_avg;
494 break;
495 case POWER_SUPPLY_PROP_VOLTAGE_BOOT:
496 val->intval = prop_values.voltage_boot;
497 break;
498 case POWER_SUPPLY_PROP_CAPACITY:
499 val->intval = prop_values.capacity;
500 break;
501 case POWER_SUPPLY_PROP_SCOPE:
502 val->intval = POWER_SUPPLY_SCOPE_DEVICE;
503 break;
504 case POWER_SUPPLY_PROP_TEMP:
505 val->intval = prop_values.temp;
506 break;
507 case POWER_SUPPLY_PROP_TEMP_MIN:
508 val->intval = 0; /* 0 C */
509 break;
510 case POWER_SUPPLY_PROP_TEMP_MAX:
511 val->intval = 400; /* 40 C */
512 break;
513 case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
514 val->intval = 15; /* 1.5 C */
515 break;
516 case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
517 val->intval = 380; /* 38 C */
518 break;
519 default:
520 ret = -EINVAL;
521 break;
522 }
523
524 return ret;
525 }
526
thunderstrike_request_psy_stats(struct thunderstrike * ts)527 static inline void thunderstrike_request_psy_stats(struct thunderstrike *ts)
528 {
529 set_bit(THUNDERSTRIKE_POWER_SUPPLY_STATS_UPDATE, &ts->update_flags);
530 schedule_work(&ts->hostcmd_req_work);
531 }
532
thunderstrike_psy_stats_timer_handler(struct timer_list * timer)533 static void thunderstrike_psy_stats_timer_handler(struct timer_list *timer)
534 {
535 struct thunderstrike *ts =
536 container_of(timer, struct thunderstrike, psy_stats_timer);
537
538 thunderstrike_request_psy_stats(ts);
539 /* Query battery statistics from device every five minutes */
540 mod_timer(timer, jiffies + 300 * HZ);
541 }
542
543 static void
thunderstrike_parse_fw_version_payload(struct shield_device * shield_dev,__le16 fw_version)544 thunderstrike_parse_fw_version_payload(struct shield_device *shield_dev,
545 __le16 fw_version)
546 {
547 shield_dev->fw_version = le16_to_cpu(fw_version);
548
549 set_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags);
550
551 hid_dbg(shield_dev->hdev, "Thunderstrike firmware version 0x%04X\n",
552 shield_dev->fw_version);
553 }
554
555 static void
thunderstrike_parse_board_info_payload(struct shield_device * shield_dev,struct thunderstrike_hostcmd_board_info * board_info)556 thunderstrike_parse_board_info_payload(struct shield_device *shield_dev,
557 struct thunderstrike_hostcmd_board_info *board_info)
558 {
559 char board_revision_str[4];
560 int i;
561
562 shield_dev->board_info.revision = le16_to_cpu(board_info->revision);
563 for (i = 0; i < 7; ++i) {
564 u16 val = le16_to_cpu(board_info->serial[i]);
565
566 shield_dev->board_info.serial_number[2 * i] = val & 0xFF;
567 shield_dev->board_info.serial_number[2 * i + 1] = val >> 8;
568 }
569 shield_dev->board_info.serial_number[14] = '\0';
570
571 set_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags);
572
573 shield_strrev(board_revision_str, 4, shield_dev->board_info.revision);
574 hid_dbg(shield_dev->hdev,
575 "Thunderstrike BOARD_REVISION_%s (0x%04X) S/N: %s\n",
576 board_revision_str, shield_dev->board_info.revision,
577 shield_dev->board_info.serial_number);
578 }
579
580 static inline void
thunderstrike_parse_haptics_payload(struct shield_device * shield_dev,struct thunderstrike_hostcmd_haptics * haptics)581 thunderstrike_parse_haptics_payload(struct shield_device *shield_dev,
582 struct thunderstrike_hostcmd_haptics *haptics)
583 {
584 hid_dbg(shield_dev->hdev,
585 "Thunderstrike haptics HOSTCMD response, left: %u right: %u\n",
586 haptics->motor_left, haptics->motor_right);
587 }
588
589 static void
thunderstrike_parse_led_payload(struct shield_device * shield_dev,enum thunderstrike_led_state led_state)590 thunderstrike_parse_led_payload(struct shield_device *shield_dev,
591 enum thunderstrike_led_state led_state)
592 {
593 struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
594
595 switch (led_state) {
596 case THUNDERSTRIKE_LED_OFF:
597 ts->led_state = 0;
598 break;
599 case THUNDERSTRIKE_LED_ON:
600 ts->led_state = 1;
601 break;
602 }
603
604 hid_dbg(shield_dev->hdev, "Thunderstrike led HOSTCMD response, 0x%02X\n", led_state);
605 }
606
thunderstrike_parse_battery_payload(struct shield_device * shield_dev,struct thunderstrike_hostcmd_battery * battery)607 static void thunderstrike_parse_battery_payload(
608 struct shield_device *shield_dev,
609 struct thunderstrike_hostcmd_battery *battery)
610 {
611 struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
612 u16 hostcmd_voltage_boot = le16_to_cpu(battery->voltage_boot);
613 u16 hostcmd_voltage_avg = le16_to_cpu(battery->voltage_avg);
614 u16 hostcmd_voltage_min = le16_to_cpu(battery->voltage_min);
615 u16 hostcmd_voltage_now = le16_to_cpu(battery->voltage_now);
616 u16 hostcmd_thermistor = le16_to_cpu(battery->thermistor);
617 int voltage_boot, voltage_avg, voltage_min, voltage_now;
618 struct hid_device *hdev = shield_dev->hdev;
619 u8 capacity = battery->capacity;
620 int temp;
621
622 /* Convert thunderstrike device values to µV and tenths of degree Celsius */
623 voltage_boot = hostcmd_voltage_boot * 1000;
624 voltage_avg = hostcmd_voltage_avg * 1000;
625 voltage_min = hostcmd_voltage_min * 1000;
626 voltage_now = hostcmd_voltage_now * 1000;
627 temp = (1378 - (int)hostcmd_thermistor) * 10 / 19;
628
629 /* Copy converted values */
630 spin_lock(&ts->psy_stats_lock);
631 ts->psy_stats.voltage_boot = voltage_boot;
632 ts->psy_stats.voltage_avg = voltage_avg;
633 ts->psy_stats.voltage_min = voltage_min;
634 ts->psy_stats.voltage_now = voltage_now;
635 ts->psy_stats.capacity = capacity;
636 ts->psy_stats.temp = temp;
637 spin_unlock(&ts->psy_stats_lock);
638
639 set_bit(SHIELD_BATTERY_STATS_INITIALIZED, &shield_dev->initialized_flags);
640
641 hid_dbg(hdev,
642 "Thunderstrike battery HOSTCMD response, voltage_avg: %u voltage_now: %u\n",
643 hostcmd_voltage_avg, hostcmd_voltage_now);
644 hid_dbg(hdev,
645 "Thunderstrike battery HOSTCMD response, voltage_boot: %u voltage_min: %u\n",
646 hostcmd_voltage_boot, hostcmd_voltage_min);
647 hid_dbg(hdev,
648 "Thunderstrike battery HOSTCMD response, thermistor: %u\n",
649 hostcmd_thermistor);
650 hid_dbg(hdev,
651 "Thunderstrike battery HOSTCMD response, capacity: %u%%\n",
652 capacity);
653 }
654
thunderstrike_parse_charger_payload(struct shield_device * shield_dev,struct thunderstrike_hostcmd_charger * charger)655 static void thunderstrike_parse_charger_payload(
656 struct shield_device *shield_dev,
657 struct thunderstrike_hostcmd_charger *charger)
658 {
659 struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
660 int charge_type = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
661 struct hid_device *hdev = shield_dev->hdev;
662 int status = POWER_SUPPLY_STATUS_UNKNOWN;
663
664 switch (charger->type) {
665 case THUNDERSTRIKE_CHARGER_TYPE_NONE:
666 charge_type = POWER_SUPPLY_CHARGE_TYPE_NONE;
667 break;
668 case THUNDERSTRIKE_CHARGER_TYPE_TRICKLE:
669 charge_type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
670 break;
671 case THUNDERSTRIKE_CHARGER_TYPE_NORMAL:
672 charge_type = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
673 break;
674 default:
675 hid_warn(hdev, "Unhandled Thunderstrike charger HOSTCMD type, %u\n",
676 charger->type);
677 break;
678 }
679
680 switch (charger->state) {
681 case THUNDERSTRIKE_CHARGER_STATE_UNKNOWN:
682 status = POWER_SUPPLY_STATUS_UNKNOWN;
683 break;
684 case THUNDERSTRIKE_CHARGER_STATE_DISABLED:
685 /* Indicates charger is disconnected */
686 break;
687 case THUNDERSTRIKE_CHARGER_STATE_CHARGING:
688 status = POWER_SUPPLY_STATUS_CHARGING;
689 break;
690 case THUNDERSTRIKE_CHARGER_STATE_FULL:
691 status = POWER_SUPPLY_STATUS_FULL;
692 break;
693 case THUNDERSTRIKE_CHARGER_STATE_FAILED:
694 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
695 hid_err(hdev, "Thunderstrike device failed to charge\n");
696 break;
697 default:
698 hid_warn(hdev, "Unhandled Thunderstrike charger HOSTCMD state, %u\n",
699 charger->state);
700 break;
701 }
702
703 if (!charger->connected)
704 status = POWER_SUPPLY_STATUS_DISCHARGING;
705
706 spin_lock(&ts->psy_stats_lock);
707 ts->psy_stats.charge_type = charge_type;
708 ts->psy_stats.status = status;
709 spin_unlock(&ts->psy_stats_lock);
710
711 set_bit(SHIELD_CHARGER_STATE_INITIALIZED, &shield_dev->initialized_flags);
712
713 hid_dbg(hdev,
714 "Thunderstrike charger HOSTCMD response, connected: %u, type: %u, state: %u\n",
715 charger->connected, charger->type, charger->state);
716 }
717
thunderstrike_device_init_info(struct shield_device * shield_dev)718 static inline void thunderstrike_device_init_info(struct shield_device *shield_dev)
719 {
720 struct thunderstrike *ts =
721 container_of(shield_dev, struct thunderstrike, base);
722
723 if (!test_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags))
724 thunderstrike_request_firmware_version(ts);
725
726 if (!test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags))
727 thunderstrike_request_board_info(ts);
728
729 if (!test_bit(SHIELD_BATTERY_STATS_INITIALIZED, &shield_dev->initialized_flags) ||
730 !test_bit(SHIELD_CHARGER_STATE_INITIALIZED, &shield_dev->initialized_flags))
731 thunderstrike_psy_stats_timer_handler(&ts->psy_stats_timer);
732 }
733
thunderstrike_parse_report(struct shield_device * shield_dev,struct hid_report * report,u8 * data,int size)734 static int thunderstrike_parse_report(struct shield_device *shield_dev,
735 struct hid_report *report, u8 *data,
736 int size)
737 {
738 struct thunderstrike_hostcmd_resp_report *hostcmd_resp_report;
739 struct hid_device *hdev = shield_dev->hdev;
740
741 switch (report->id) {
742 case THUNDERSTRIKE_HOSTCMD_RESP_REPORT_ID:
743 if (size != THUNDERSTRIKE_HOSTCMD_REPORT_SIZE) {
744 hid_err(hdev,
745 "Encountered Thunderstrike HOSTCMD HID report with unexpected size %d\n",
746 size);
747 return -EINVAL;
748 }
749
750 hostcmd_resp_report =
751 (struct thunderstrike_hostcmd_resp_report *)data;
752
753 switch (hostcmd_resp_report->cmd_id) {
754 case THUNDERSTRIKE_HOSTCMD_ID_FW_VERSION:
755 thunderstrike_parse_fw_version_payload(
756 shield_dev, hostcmd_resp_report->fw_version);
757 break;
758 case THUNDERSTRIKE_HOSTCMD_ID_LED:
759 thunderstrike_parse_led_payload(shield_dev, hostcmd_resp_report->led_state);
760 break;
761 case THUNDERSTRIKE_HOSTCMD_ID_BATTERY:
762 thunderstrike_parse_battery_payload(shield_dev,
763 &hostcmd_resp_report->battery);
764 break;
765 case THUNDERSTRIKE_HOSTCMD_ID_BOARD_INFO:
766 thunderstrike_parse_board_info_payload(
767 shield_dev, &hostcmd_resp_report->board_info);
768 break;
769 case THUNDERSTRIKE_HOSTCMD_ID_HAPTICS:
770 thunderstrike_parse_haptics_payload(
771 shield_dev, &hostcmd_resp_report->motors);
772 break;
773 case THUNDERSTRIKE_HOSTCMD_ID_USB_INIT:
774 /* May block HOSTCMD requests till received initially */
775 thunderstrike_device_init_info(shield_dev);
776 break;
777 case THUNDERSTRIKE_HOSTCMD_ID_CHARGER:
778 /* May block HOSTCMD requests till received initially */
779 thunderstrike_device_init_info(shield_dev);
780
781 thunderstrike_parse_charger_payload(
782 shield_dev, &hostcmd_resp_report->charger);
783 break;
784 default:
785 hid_warn(hdev,
786 "Unhandled Thunderstrike HOSTCMD id %d\n",
787 hostcmd_resp_report->cmd_id);
788 return -ENOENT;
789 }
790
791 break;
792 default:
793 return 0;
794 }
795
796 return 0;
797 }
798
thunderstrike_led_create(struct thunderstrike * ts)799 static inline int thunderstrike_led_create(struct thunderstrike *ts)
800 {
801 struct led_classdev *led = &ts->led_dev;
802
803 led->name = devm_kasprintf(&ts->base.hdev->dev, GFP_KERNEL,
804 "thunderstrike%d:blue:led", ts->id);
805 if (!led->name)
806 return -ENOMEM;
807 led->max_brightness = 1;
808 led->flags = LED_CORE_SUSPENDRESUME | LED_RETAIN_AT_SHUTDOWN;
809 led->brightness_get = &thunderstrike_led_get_brightness;
810 led->brightness_set = &thunderstrike_led_set_brightness;
811
812 return led_classdev_register(&ts->base.hdev->dev, led);
813 }
814
thunderstrike_psy_create(struct shield_device * shield_dev)815 static inline int thunderstrike_psy_create(struct shield_device *shield_dev)
816 {
817 struct thunderstrike *ts = container_of(shield_dev, struct thunderstrike, base);
818 struct power_supply_config psy_cfg = { .drv_data = shield_dev, };
819 struct hid_device *hdev = shield_dev->hdev;
820 int ret;
821
822 /*
823 * Set an initial capacity and temperature value to avoid prematurely
824 * triggering alerts. Will be replaced by values queried from initial
825 * HOSTCMD requests.
826 */
827 ts->psy_stats.capacity = 100;
828 ts->psy_stats.temp = 182;
829
830 shield_dev->battery_dev.desc.properties = thunderstrike_battery_props;
831 shield_dev->battery_dev.desc.num_properties =
832 ARRAY_SIZE(thunderstrike_battery_props);
833 shield_dev->battery_dev.desc.get_property = thunderstrike_battery_get_property;
834 shield_dev->battery_dev.desc.type = POWER_SUPPLY_TYPE_BATTERY;
835 shield_dev->battery_dev.desc.name =
836 devm_kasprintf(&ts->base.hdev->dev, GFP_KERNEL,
837 "thunderstrike_%d", ts->id);
838 if (!shield_dev->battery_dev.desc.name)
839 return -ENOMEM;
840
841 shield_dev->battery_dev.psy = power_supply_register(
842 &hdev->dev, &shield_dev->battery_dev.desc, &psy_cfg);
843 if (IS_ERR(shield_dev->battery_dev.psy)) {
844 hid_err(hdev, "Failed to register Thunderstrike battery device\n");
845 return PTR_ERR(shield_dev->battery_dev.psy);
846 }
847
848 ret = power_supply_powers(shield_dev->battery_dev.psy, &hdev->dev);
849 if (ret) {
850 hid_err(hdev, "Failed to associate battery device to Thunderstrike\n");
851 goto err;
852 }
853
854 return 0;
855
856 err:
857 power_supply_unregister(shield_dev->battery_dev.psy);
858 return ret;
859 }
860
thunderstrike_create(struct hid_device * hdev)861 static struct shield_device *thunderstrike_create(struct hid_device *hdev)
862 {
863 struct shield_device *shield_dev;
864 struct thunderstrike *ts;
865 int ret;
866
867 ts = devm_kzalloc(&hdev->dev, sizeof(*ts), GFP_KERNEL);
868 if (!ts)
869 return ERR_PTR(-ENOMEM);
870
871 ts->req_report_dmabuf = devm_kzalloc(
872 &hdev->dev, THUNDERSTRIKE_HOSTCMD_REPORT_SIZE, GFP_KERNEL);
873 if (!ts->req_report_dmabuf)
874 return ERR_PTR(-ENOMEM);
875
876 shield_dev = &ts->base;
877 shield_dev->hdev = hdev;
878 shield_dev->codename = "Thunderstrike";
879
880 spin_lock_init(&ts->haptics_update_lock);
881 spin_lock_init(&ts->psy_stats_lock);
882 INIT_WORK(&ts->hostcmd_req_work, thunderstrike_hostcmd_req_work_handler);
883
884 hid_set_drvdata(hdev, shield_dev);
885
886 ts->id = ida_alloc(&thunderstrike_ida, GFP_KERNEL);
887 if (ts->id < 0)
888 return ERR_PTR(ts->id);
889
890 ts->haptics_dev = shield_haptics_create(shield_dev, thunderstrike_play_effect);
891 if (IS_ERR(ts->haptics_dev)) {
892 hid_err(hdev, "Failed to create Thunderstrike haptics instance\n");
893 ret = PTR_ERR(ts->haptics_dev);
894 goto err_id;
895 }
896
897 ret = thunderstrike_psy_create(shield_dev);
898 if (ret) {
899 hid_err(hdev, "Failed to create Thunderstrike power supply instance\n");
900 goto err_haptics;
901 }
902
903 ret = thunderstrike_led_create(ts);
904 if (ret) {
905 hid_err(hdev, "Failed to create Thunderstrike LED instance\n");
906 goto err_psy;
907 }
908
909 timer_setup(&ts->psy_stats_timer, thunderstrike_psy_stats_timer_handler, 0);
910
911 hid_info(hdev, "Registered Thunderstrike controller\n");
912 return shield_dev;
913
914 err_psy:
915 power_supply_unregister(shield_dev->battery_dev.psy);
916 err_haptics:
917 if (ts->haptics_dev)
918 input_unregister_device(ts->haptics_dev);
919 err_id:
920 ida_free(&thunderstrike_ida, ts->id);
921 return ERR_PTR(ret);
922 }
923
thunderstrike_destroy(struct thunderstrike * ts)924 static void thunderstrike_destroy(struct thunderstrike *ts)
925 {
926 led_classdev_unregister(&ts->led_dev);
927 power_supply_unregister(ts->base.battery_dev.psy);
928 if (ts->haptics_dev)
929 input_unregister_device(ts->haptics_dev);
930 ida_free(&thunderstrike_ida, ts->id);
931 }
932
android_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)933 static int android_input_mapping(struct hid_device *hdev, struct hid_input *hi,
934 struct hid_field *field,
935 struct hid_usage *usage, unsigned long **bit,
936 int *max)
937 {
938 if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
939 return 0;
940
941 switch (usage->hid & HID_USAGE) {
942 case HID_USAGE_ANDROID_PLAYPAUSE_BTN:
943 android_map_key(KEY_PLAYPAUSE);
944 break;
945 case HID_USAGE_ANDROID_VOLUMEUP_BTN:
946 android_map_key(KEY_VOLUMEUP);
947 break;
948 case HID_USAGE_ANDROID_VOLUMEDOWN_BTN:
949 android_map_key(KEY_VOLUMEDOWN);
950 break;
951 case HID_USAGE_ANDROID_SEARCH_BTN:
952 android_map_key(BTN_Z);
953 break;
954 case HID_USAGE_ANDROID_HOME_BTN:
955 android_map_key(BTN_MODE);
956 break;
957 case HID_USAGE_ANDROID_BACK_BTN:
958 android_map_key(BTN_SELECT);
959 break;
960 default:
961 return 0;
962 }
963
964 return 1;
965 }
966
firmware_version_show(struct device * dev,struct device_attribute * attr,char * buf)967 static ssize_t firmware_version_show(struct device *dev,
968 struct device_attribute *attr, char *buf)
969 {
970 struct hid_device *hdev = to_hid_device(dev);
971 struct shield_device *shield_dev;
972 int ret;
973
974 shield_dev = hid_get_drvdata(hdev);
975
976 if (test_bit(SHIELD_FW_VERSION_INITIALIZED, &shield_dev->initialized_flags))
977 ret = sysfs_emit(buf, "0x%04X\n", shield_dev->fw_version);
978 else
979 ret = sysfs_emit(buf, NOT_INIT_STR "\n");
980
981 return ret;
982 }
983
984 static DEVICE_ATTR_RO(firmware_version);
985
hardware_version_show(struct device * dev,struct device_attribute * attr,char * buf)986 static ssize_t hardware_version_show(struct device *dev,
987 struct device_attribute *attr, char *buf)
988 {
989 struct hid_device *hdev = to_hid_device(dev);
990 struct shield_device *shield_dev;
991 char board_revision_str[4];
992 int ret;
993
994 shield_dev = hid_get_drvdata(hdev);
995
996 if (test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags)) {
997 shield_strrev(board_revision_str, 4, shield_dev->board_info.revision);
998 ret = sysfs_emit(buf, "%s BOARD_REVISION_%s (0x%04X)\n",
999 shield_dev->codename, board_revision_str,
1000 shield_dev->board_info.revision);
1001 } else
1002 ret = sysfs_emit(buf, NOT_INIT_STR "\n");
1003
1004 return ret;
1005 }
1006
1007 static DEVICE_ATTR_RO(hardware_version);
1008
serial_number_show(struct device * dev,struct device_attribute * attr,char * buf)1009 static ssize_t serial_number_show(struct device *dev,
1010 struct device_attribute *attr, char *buf)
1011 {
1012 struct hid_device *hdev = to_hid_device(dev);
1013 struct shield_device *shield_dev;
1014 int ret;
1015
1016 shield_dev = hid_get_drvdata(hdev);
1017
1018 if (test_bit(SHIELD_BOARD_INFO_INITIALIZED, &shield_dev->initialized_flags))
1019 ret = sysfs_emit(buf, "%s\n", shield_dev->board_info.serial_number);
1020 else
1021 ret = sysfs_emit(buf, NOT_INIT_STR "\n");
1022
1023 return ret;
1024 }
1025
1026 static DEVICE_ATTR_RO(serial_number);
1027
1028 static struct attribute *shield_device_attrs[] = {
1029 &dev_attr_firmware_version.attr,
1030 &dev_attr_hardware_version.attr,
1031 &dev_attr_serial_number.attr,
1032 NULL,
1033 };
1034 ATTRIBUTE_GROUPS(shield_device);
1035
shield_raw_event(struct hid_device * hdev,struct hid_report * report,u8 * data,int size)1036 static int shield_raw_event(struct hid_device *hdev, struct hid_report *report,
1037 u8 *data, int size)
1038 {
1039 struct shield_device *dev = hid_get_drvdata(hdev);
1040
1041 return thunderstrike_parse_report(dev, report, data, size);
1042 }
1043
shield_probe(struct hid_device * hdev,const struct hid_device_id * id)1044 static int shield_probe(struct hid_device *hdev, const struct hid_device_id *id)
1045 {
1046 struct shield_device *shield_dev = NULL;
1047 struct thunderstrike *ts;
1048 int ret;
1049
1050 ret = hid_parse(hdev);
1051 if (ret) {
1052 hid_err(hdev, "Parse failed\n");
1053 return ret;
1054 }
1055
1056 switch (id->product) {
1057 case USB_DEVICE_ID_NVIDIA_THUNDERSTRIKE_CONTROLLER:
1058 shield_dev = thunderstrike_create(hdev);
1059 break;
1060 }
1061
1062 if (unlikely(!shield_dev)) {
1063 hid_err(hdev, "Failed to identify SHIELD device\n");
1064 return -ENODEV;
1065 }
1066 if (IS_ERR(shield_dev)) {
1067 hid_err(hdev, "Failed to create SHIELD device\n");
1068 return PTR_ERR(shield_dev);
1069 }
1070
1071 ts = container_of(shield_dev, struct thunderstrike, base);
1072
1073 ret = hid_hw_start(hdev, HID_CONNECT_HIDINPUT);
1074 if (ret) {
1075 hid_err(hdev, "Failed to start HID device\n");
1076 goto err_ts_create;
1077 }
1078
1079 ret = hid_hw_open(hdev);
1080 if (ret) {
1081 hid_err(hdev, "Failed to open HID device\n");
1082 goto err_stop;
1083 }
1084
1085 thunderstrike_device_init_info(shield_dev);
1086
1087 return ret;
1088
1089 err_stop:
1090 hid_hw_stop(hdev);
1091 err_ts_create:
1092 thunderstrike_destroy(ts);
1093 return ret;
1094 }
1095
shield_remove(struct hid_device * hdev)1096 static void shield_remove(struct hid_device *hdev)
1097 {
1098 struct shield_device *dev = hid_get_drvdata(hdev);
1099 struct thunderstrike *ts;
1100
1101 ts = container_of(dev, struct thunderstrike, base);
1102
1103 hid_hw_close(hdev);
1104 thunderstrike_destroy(ts);
1105 del_timer_sync(&ts->psy_stats_timer);
1106 cancel_work_sync(&ts->hostcmd_req_work);
1107 hid_hw_stop(hdev);
1108 }
1109
1110 static const struct hid_device_id shield_devices[] = {
1111 { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_NVIDIA,
1112 USB_DEVICE_ID_NVIDIA_THUNDERSTRIKE_CONTROLLER) },
1113 { HID_USB_DEVICE(USB_VENDOR_ID_NVIDIA,
1114 USB_DEVICE_ID_NVIDIA_THUNDERSTRIKE_CONTROLLER) },
1115 { }
1116 };
1117 MODULE_DEVICE_TABLE(hid, shield_devices);
1118
1119 static struct hid_driver shield_driver = {
1120 .name = "shield",
1121 .id_table = shield_devices,
1122 .input_mapping = android_input_mapping,
1123 .probe = shield_probe,
1124 .remove = shield_remove,
1125 .raw_event = shield_raw_event,
1126 .driver = {
1127 .dev_groups = shield_device_groups,
1128 },
1129 };
1130 module_hid_driver(shield_driver);
1131
1132 MODULE_AUTHOR("Rahul Rameshbabu <rrameshbabu@nvidia.com>");
1133 MODULE_DESCRIPTION("HID Driver for NVIDIA SHIELD peripherals.");
1134 MODULE_LICENSE("GPL");
1135