1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2016-2017 Google, Inc 4 * 5 * Fairchild FUSB302 Type-C Chip Driver 6 */ 7 8 #include <linux/debugfs.h> 9 #include <linux/delay.h> 10 #include <linux/errno.h> 11 #include <linux/extcon.h> 12 #include <linux/gpio/consumer.h> 13 #include <linux/i2c.h> 14 #include <linux/interrupt.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/mutex.h> 18 #include <linux/of_device.h> 19 #include <linux/pinctrl/consumer.h> 20 #include <linux/proc_fs.h> 21 #include <linux/regulator/consumer.h> 22 #include <linux/sched/clock.h> 23 #include <linux/seq_file.h> 24 #include <linux/slab.h> 25 #include <linux/spinlock.h> 26 #include <linux/string.h> 27 #include <linux/types.h> 28 #include <linux/usb.h> 29 #include <linux/usb/typec.h> 30 #include <linux/usb/tcpm.h> 31 #include <linux/usb/pd.h> 32 #include <linux/workqueue.h> 33 34 #include "fusb302_reg.h" 35 36 /* 37 * When the device is SNK, BC_LVL interrupt is used to monitor cc pins 38 * for the current capability offered by the SRC. As FUSB302 chip fires 39 * the BC_LVL interrupt on PD signalings, cc lvl should be handled after 40 * a delay to avoid measuring on PD activities. The delay is slightly 41 * longer than PD_T_PD_DEBPUNCE (10-20ms). 42 */ 43 #define T_BC_LVL_DEBOUNCE_DELAY_MS 30 44 45 enum toggling_mode { 46 TOGGLING_MODE_OFF, 47 TOGGLING_MODE_DRP, 48 TOGGLING_MODE_SNK, 49 TOGGLING_MODE_SRC, 50 }; 51 52 enum src_current_status { 53 SRC_CURRENT_DEFAULT, 54 SRC_CURRENT_MEDIUM, 55 SRC_CURRENT_HIGH, 56 }; 57 58 static const u8 ra_mda_value[] = { 59 [SRC_CURRENT_DEFAULT] = 4, /* 210mV */ 60 [SRC_CURRENT_MEDIUM] = 9, /* 420mV */ 61 [SRC_CURRENT_HIGH] = 18, /* 798mV */ 62 }; 63 64 static const u8 rd_mda_value[] = { 65 [SRC_CURRENT_DEFAULT] = 38, /* 1638mV */ 66 [SRC_CURRENT_MEDIUM] = 38, /* 1638mV */ 67 [SRC_CURRENT_HIGH] = 61, /* 2604mV */ 68 }; 69 70 #define LOG_BUFFER_ENTRIES 1024 71 #define LOG_BUFFER_ENTRY_SIZE 128 72 73 struct fusb302_chip { 74 struct device *dev; 75 struct i2c_client *i2c_client; 76 struct tcpm_port *tcpm_port; 77 struct tcpc_dev tcpc_dev; 78 79 struct regulator *vbus; 80 81 spinlock_t irq_lock; 82 struct work_struct irq_work; 83 bool irq_suspended; 84 bool irq_while_suspended; 85 struct gpio_desc *gpio_int_n; 86 int gpio_int_n_irq; 87 struct extcon_dev *extcon; 88 89 struct workqueue_struct *wq; 90 struct delayed_work bc_lvl_handler; 91 92 /* lock for sharing chip states */ 93 struct mutex lock; 94 95 /* chip status */ 96 enum toggling_mode toggling_mode; 97 enum src_current_status src_current_status; 98 bool intr_togdone; 99 bool intr_bc_lvl; 100 bool intr_comp_chng; 101 102 /* port status */ 103 bool vconn_on; 104 bool vbus_on; 105 bool charge_on; 106 bool vbus_present; 107 enum typec_cc_polarity cc_polarity; 108 enum typec_cc_status cc1; 109 enum typec_cc_status cc2; 110 u32 snk_pdo[PDO_MAX_OBJECTS]; 111 112 #ifdef CONFIG_DEBUG_FS 113 struct dentry *dentry; 114 /* lock for log buffer access */ 115 struct mutex logbuffer_lock; 116 int logbuffer_head; 117 int logbuffer_tail; 118 u8 *logbuffer[LOG_BUFFER_ENTRIES]; 119 #endif 120 }; 121 122 /* 123 * Logging 124 */ 125 126 #ifdef CONFIG_DEBUG_FS 127 static bool fusb302_log_full(struct fusb302_chip *chip) 128 { 129 return chip->logbuffer_tail == 130 (chip->logbuffer_head + 1) % LOG_BUFFER_ENTRIES; 131 } 132 133 __printf(2, 0) 134 static void _fusb302_log(struct fusb302_chip *chip, const char *fmt, 135 va_list args) 136 { 137 char tmpbuffer[LOG_BUFFER_ENTRY_SIZE]; 138 u64 ts_nsec = local_clock(); 139 unsigned long rem_nsec; 140 141 if (!chip->logbuffer[chip->logbuffer_head]) { 142 chip->logbuffer[chip->logbuffer_head] = 143 kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL); 144 if (!chip->logbuffer[chip->logbuffer_head]) 145 return; 146 } 147 148 vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args); 149 150 mutex_lock(&chip->logbuffer_lock); 151 152 if (fusb302_log_full(chip)) { 153 chip->logbuffer_head = max(chip->logbuffer_head - 1, 0); 154 strlcpy(tmpbuffer, "overflow", sizeof(tmpbuffer)); 155 } 156 157 if (chip->logbuffer_head < 0 || 158 chip->logbuffer_head >= LOG_BUFFER_ENTRIES) { 159 dev_warn(chip->dev, 160 "Bad log buffer index %d\n", chip->logbuffer_head); 161 goto abort; 162 } 163 164 if (!chip->logbuffer[chip->logbuffer_head]) { 165 dev_warn(chip->dev, 166 "Log buffer index %d is NULL\n", chip->logbuffer_head); 167 goto abort; 168 } 169 170 rem_nsec = do_div(ts_nsec, 1000000000); 171 scnprintf(chip->logbuffer[chip->logbuffer_head], 172 LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s", 173 (unsigned long)ts_nsec, rem_nsec / 1000, 174 tmpbuffer); 175 chip->logbuffer_head = (chip->logbuffer_head + 1) % LOG_BUFFER_ENTRIES; 176 177 abort: 178 mutex_unlock(&chip->logbuffer_lock); 179 } 180 181 __printf(2, 3) 182 static void fusb302_log(struct fusb302_chip *chip, const char *fmt, ...) 183 { 184 va_list args; 185 186 va_start(args, fmt); 187 _fusb302_log(chip, fmt, args); 188 va_end(args); 189 } 190 191 static int fusb302_debug_show(struct seq_file *s, void *v) 192 { 193 struct fusb302_chip *chip = (struct fusb302_chip *)s->private; 194 int tail; 195 196 mutex_lock(&chip->logbuffer_lock); 197 tail = chip->logbuffer_tail; 198 while (tail != chip->logbuffer_head) { 199 seq_printf(s, "%s\n", chip->logbuffer[tail]); 200 tail = (tail + 1) % LOG_BUFFER_ENTRIES; 201 } 202 if (!seq_has_overflowed(s)) 203 chip->logbuffer_tail = tail; 204 mutex_unlock(&chip->logbuffer_lock); 205 206 return 0; 207 } 208 DEFINE_SHOW_ATTRIBUTE(fusb302_debug); 209 210 static void fusb302_debugfs_init(struct fusb302_chip *chip) 211 { 212 char name[NAME_MAX]; 213 214 mutex_init(&chip->logbuffer_lock); 215 snprintf(name, NAME_MAX, "fusb302-%s", dev_name(chip->dev)); 216 chip->dentry = debugfs_create_dir(name, usb_debug_root); 217 debugfs_create_file("log", S_IFREG | 0444, chip->dentry, chip, 218 &fusb302_debug_fops); 219 } 220 221 static void fusb302_debugfs_exit(struct fusb302_chip *chip) 222 { 223 debugfs_remove(chip->dentry); 224 } 225 226 #else 227 228 static void fusb302_log(const struct fusb302_chip *chip, 229 const char *fmt, ...) { } 230 static void fusb302_debugfs_init(const struct fusb302_chip *chip) { } 231 static void fusb302_debugfs_exit(const struct fusb302_chip *chip) { } 232 233 #endif 234 235 static int fusb302_i2c_write(struct fusb302_chip *chip, 236 u8 address, u8 data) 237 { 238 int ret = 0; 239 240 ret = i2c_smbus_write_byte_data(chip->i2c_client, address, data); 241 if (ret < 0) 242 fusb302_log(chip, "cannot write 0x%02x to 0x%02x, ret=%d", 243 data, address, ret); 244 245 return ret; 246 } 247 248 static int fusb302_i2c_block_write(struct fusb302_chip *chip, u8 address, 249 u8 length, const u8 *data) 250 { 251 int ret = 0; 252 253 if (length <= 0) 254 return ret; 255 256 ret = i2c_smbus_write_i2c_block_data(chip->i2c_client, address, 257 length, data); 258 if (ret < 0) 259 fusb302_log(chip, "cannot block write 0x%02x, len=%d, ret=%d", 260 address, length, ret); 261 262 return ret; 263 } 264 265 static int fusb302_i2c_read(struct fusb302_chip *chip, 266 u8 address, u8 *data) 267 { 268 int ret = 0; 269 270 ret = i2c_smbus_read_byte_data(chip->i2c_client, address); 271 *data = (u8)ret; 272 if (ret < 0) 273 fusb302_log(chip, "cannot read %02x, ret=%d", address, ret); 274 275 return ret; 276 } 277 278 static int fusb302_i2c_block_read(struct fusb302_chip *chip, u8 address, 279 u8 length, u8 *data) 280 { 281 int ret = 0; 282 283 if (length <= 0) 284 return ret; 285 286 ret = i2c_smbus_read_i2c_block_data(chip->i2c_client, address, 287 length, data); 288 if (ret < 0) { 289 fusb302_log(chip, "cannot block read 0x%02x, len=%d, ret=%d", 290 address, length, ret); 291 goto done; 292 } 293 if (ret != length) { 294 fusb302_log(chip, "only read %d/%d bytes from 0x%02x", 295 ret, length, address); 296 ret = -EIO; 297 } 298 299 done: 300 return ret; 301 } 302 303 static int fusb302_i2c_mask_write(struct fusb302_chip *chip, u8 address, 304 u8 mask, u8 value) 305 { 306 int ret = 0; 307 u8 data; 308 309 ret = fusb302_i2c_read(chip, address, &data); 310 if (ret < 0) 311 return ret; 312 data &= ~mask; 313 data |= value; 314 ret = fusb302_i2c_write(chip, address, data); 315 if (ret < 0) 316 return ret; 317 318 return ret; 319 } 320 321 static int fusb302_i2c_set_bits(struct fusb302_chip *chip, u8 address, 322 u8 set_bits) 323 { 324 return fusb302_i2c_mask_write(chip, address, 0x00, set_bits); 325 } 326 327 static int fusb302_i2c_clear_bits(struct fusb302_chip *chip, u8 address, 328 u8 clear_bits) 329 { 330 return fusb302_i2c_mask_write(chip, address, clear_bits, 0x00); 331 } 332 333 static int fusb302_sw_reset(struct fusb302_chip *chip) 334 { 335 int ret = 0; 336 337 ret = fusb302_i2c_write(chip, FUSB_REG_RESET, 338 FUSB_REG_RESET_SW_RESET); 339 if (ret < 0) 340 fusb302_log(chip, "cannot sw reset the chip, ret=%d", ret); 341 else 342 fusb302_log(chip, "sw reset"); 343 344 return ret; 345 } 346 347 static int fusb302_enable_tx_auto_retries(struct fusb302_chip *chip, u8 retry_count) 348 { 349 int ret = 0; 350 351 ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3, retry_count | 352 FUSB_REG_CONTROL3_AUTO_RETRY); 353 354 return ret; 355 } 356 357 /* 358 * initialize interrupt on the chip 359 * - unmasked interrupt: VBUS_OK 360 */ 361 static int fusb302_init_interrupt(struct fusb302_chip *chip) 362 { 363 int ret = 0; 364 365 ret = fusb302_i2c_write(chip, FUSB_REG_MASK, 366 0xFF & ~FUSB_REG_MASK_VBUSOK); 367 if (ret < 0) 368 return ret; 369 ret = fusb302_i2c_write(chip, FUSB_REG_MASKA, 0xFF); 370 if (ret < 0) 371 return ret; 372 ret = fusb302_i2c_write(chip, FUSB_REG_MASKB, 0xFF); 373 if (ret < 0) 374 return ret; 375 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_CONTROL0, 376 FUSB_REG_CONTROL0_INT_MASK); 377 if (ret < 0) 378 return ret; 379 380 return ret; 381 } 382 383 static int fusb302_set_power_mode(struct fusb302_chip *chip, u8 power_mode) 384 { 385 int ret = 0; 386 387 ret = fusb302_i2c_write(chip, FUSB_REG_POWER, power_mode); 388 389 return ret; 390 } 391 392 static int tcpm_init(struct tcpc_dev *dev) 393 { 394 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 395 tcpc_dev); 396 int ret = 0; 397 u8 data; 398 399 ret = fusb302_sw_reset(chip); 400 if (ret < 0) 401 return ret; 402 ret = fusb302_enable_tx_auto_retries(chip, FUSB_REG_CONTROL3_N_RETRIES_3); 403 if (ret < 0) 404 return ret; 405 ret = fusb302_init_interrupt(chip); 406 if (ret < 0) 407 return ret; 408 ret = fusb302_set_power_mode(chip, FUSB_REG_POWER_PWR_ALL); 409 if (ret < 0) 410 return ret; 411 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &data); 412 if (ret < 0) 413 return ret; 414 chip->vbus_present = !!(data & FUSB_REG_STATUS0_VBUSOK); 415 ret = fusb302_i2c_read(chip, FUSB_REG_DEVICE_ID, &data); 416 if (ret < 0) 417 return ret; 418 fusb302_log(chip, "fusb302 device ID: 0x%02x", data); 419 420 return ret; 421 } 422 423 static int tcpm_get_vbus(struct tcpc_dev *dev) 424 { 425 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 426 tcpc_dev); 427 int ret = 0; 428 429 mutex_lock(&chip->lock); 430 ret = chip->vbus_present ? 1 : 0; 431 mutex_unlock(&chip->lock); 432 433 return ret; 434 } 435 436 static int tcpm_get_current_limit(struct tcpc_dev *dev) 437 { 438 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 439 tcpc_dev); 440 int current_limit = 0; 441 unsigned long timeout; 442 443 if (!chip->extcon) 444 return 0; 445 446 /* 447 * USB2 Charger detection may still be in progress when we get here, 448 * this can take upto 600ms, wait 800ms max. 449 */ 450 timeout = jiffies + msecs_to_jiffies(800); 451 do { 452 if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_SDP) == 1) 453 current_limit = 500; 454 455 if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_CDP) == 1 || 456 extcon_get_state(chip->extcon, EXTCON_CHG_USB_ACA) == 1) 457 current_limit = 1500; 458 459 if (extcon_get_state(chip->extcon, EXTCON_CHG_USB_DCP) == 1) 460 current_limit = 2000; 461 462 msleep(50); 463 } while (current_limit == 0 && time_before(jiffies, timeout)); 464 465 return current_limit; 466 } 467 468 static int fusb302_set_src_current(struct fusb302_chip *chip, 469 enum src_current_status status) 470 { 471 int ret = 0; 472 473 chip->src_current_status = status; 474 switch (status) { 475 case SRC_CURRENT_DEFAULT: 476 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0, 477 FUSB_REG_CONTROL0_HOST_CUR_MASK, 478 FUSB_REG_CONTROL0_HOST_CUR_DEF); 479 break; 480 case SRC_CURRENT_MEDIUM: 481 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0, 482 FUSB_REG_CONTROL0_HOST_CUR_MASK, 483 FUSB_REG_CONTROL0_HOST_CUR_MED); 484 break; 485 case SRC_CURRENT_HIGH: 486 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL0, 487 FUSB_REG_CONTROL0_HOST_CUR_MASK, 488 FUSB_REG_CONTROL0_HOST_CUR_HIGH); 489 break; 490 default: 491 break; 492 } 493 494 return ret; 495 } 496 497 static int fusb302_set_toggling(struct fusb302_chip *chip, 498 enum toggling_mode mode) 499 { 500 int ret = 0; 501 502 /* first disable toggling */ 503 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_CONTROL2, 504 FUSB_REG_CONTROL2_TOGGLE); 505 if (ret < 0) 506 return ret; 507 /* mask interrupts for SRC or SNK */ 508 ret = fusb302_i2c_set_bits(chip, FUSB_REG_MASK, 509 FUSB_REG_MASK_BC_LVL | 510 FUSB_REG_MASK_COMP_CHNG); 511 if (ret < 0) 512 return ret; 513 chip->intr_bc_lvl = false; 514 chip->intr_comp_chng = false; 515 /* configure toggling mode: none/snk/src/drp */ 516 switch (mode) { 517 case TOGGLING_MODE_OFF: 518 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2, 519 FUSB_REG_CONTROL2_MODE_MASK, 520 FUSB_REG_CONTROL2_MODE_NONE); 521 if (ret < 0) 522 return ret; 523 break; 524 case TOGGLING_MODE_SNK: 525 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2, 526 FUSB_REG_CONTROL2_MODE_MASK, 527 FUSB_REG_CONTROL2_MODE_UFP); 528 if (ret < 0) 529 return ret; 530 break; 531 case TOGGLING_MODE_SRC: 532 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2, 533 FUSB_REG_CONTROL2_MODE_MASK, 534 FUSB_REG_CONTROL2_MODE_DFP); 535 if (ret < 0) 536 return ret; 537 break; 538 case TOGGLING_MODE_DRP: 539 ret = fusb302_i2c_mask_write(chip, FUSB_REG_CONTROL2, 540 FUSB_REG_CONTROL2_MODE_MASK, 541 FUSB_REG_CONTROL2_MODE_DRP); 542 if (ret < 0) 543 return ret; 544 break; 545 default: 546 break; 547 } 548 549 if (mode == TOGGLING_MODE_OFF) { 550 /* mask TOGDONE interrupt */ 551 ret = fusb302_i2c_set_bits(chip, FUSB_REG_MASKA, 552 FUSB_REG_MASKA_TOGDONE); 553 if (ret < 0) 554 return ret; 555 chip->intr_togdone = false; 556 } else { 557 /* Datasheet says vconn MUST be off when toggling */ 558 WARN(chip->vconn_on, "Vconn is on during toggle start"); 559 /* unmask TOGDONE interrupt */ 560 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA, 561 FUSB_REG_MASKA_TOGDONE); 562 if (ret < 0) 563 return ret; 564 chip->intr_togdone = true; 565 /* start toggling */ 566 ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL2, 567 FUSB_REG_CONTROL2_TOGGLE); 568 if (ret < 0) 569 return ret; 570 /* during toggling, consider cc as Open */ 571 chip->cc1 = TYPEC_CC_OPEN; 572 chip->cc2 = TYPEC_CC_OPEN; 573 } 574 chip->toggling_mode = mode; 575 576 return ret; 577 } 578 579 static const char * const typec_cc_status_name[] = { 580 [TYPEC_CC_OPEN] = "Open", 581 [TYPEC_CC_RA] = "Ra", 582 [TYPEC_CC_RD] = "Rd", 583 [TYPEC_CC_RP_DEF] = "Rp-def", 584 [TYPEC_CC_RP_1_5] = "Rp-1.5", 585 [TYPEC_CC_RP_3_0] = "Rp-3.0", 586 }; 587 588 static const enum src_current_status cc_src_current[] = { 589 [TYPEC_CC_OPEN] = SRC_CURRENT_DEFAULT, 590 [TYPEC_CC_RA] = SRC_CURRENT_DEFAULT, 591 [TYPEC_CC_RD] = SRC_CURRENT_DEFAULT, 592 [TYPEC_CC_RP_DEF] = SRC_CURRENT_DEFAULT, 593 [TYPEC_CC_RP_1_5] = SRC_CURRENT_MEDIUM, 594 [TYPEC_CC_RP_3_0] = SRC_CURRENT_HIGH, 595 }; 596 597 static int tcpm_set_cc(struct tcpc_dev *dev, enum typec_cc_status cc) 598 { 599 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 600 tcpc_dev); 601 u8 switches0_mask = FUSB_REG_SWITCHES0_CC1_PU_EN | 602 FUSB_REG_SWITCHES0_CC2_PU_EN | 603 FUSB_REG_SWITCHES0_CC1_PD_EN | 604 FUSB_REG_SWITCHES0_CC2_PD_EN; 605 u8 rd_mda, switches0_data = 0x00; 606 int ret = 0; 607 608 mutex_lock(&chip->lock); 609 switch (cc) { 610 case TYPEC_CC_OPEN: 611 break; 612 case TYPEC_CC_RD: 613 switches0_data |= FUSB_REG_SWITCHES0_CC1_PD_EN | 614 FUSB_REG_SWITCHES0_CC2_PD_EN; 615 break; 616 case TYPEC_CC_RP_DEF: 617 case TYPEC_CC_RP_1_5: 618 case TYPEC_CC_RP_3_0: 619 switches0_data |= (chip->cc_polarity == TYPEC_POLARITY_CC1) ? 620 FUSB_REG_SWITCHES0_CC1_PU_EN : 621 FUSB_REG_SWITCHES0_CC2_PU_EN; 622 break; 623 default: 624 fusb302_log(chip, "unsupported cc value %s", 625 typec_cc_status_name[cc]); 626 ret = -EINVAL; 627 goto done; 628 } 629 630 fusb302_log(chip, "cc := %s", typec_cc_status_name[cc]); 631 632 ret = fusb302_set_toggling(chip, TOGGLING_MODE_OFF); 633 if (ret < 0) { 634 fusb302_log(chip, "cannot set toggling mode, ret=%d", ret); 635 goto done; 636 } 637 638 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0, 639 switches0_mask, switches0_data); 640 if (ret < 0) { 641 fusb302_log(chip, "cannot set pull-up/-down, ret = %d", ret); 642 goto done; 643 } 644 /* reset the cc status */ 645 chip->cc1 = TYPEC_CC_OPEN; 646 chip->cc2 = TYPEC_CC_OPEN; 647 648 /* adjust current for SRC */ 649 ret = fusb302_set_src_current(chip, cc_src_current[cc]); 650 if (ret < 0) { 651 fusb302_log(chip, "cannot set src current %s, ret=%d", 652 typec_cc_status_name[cc], ret); 653 goto done; 654 } 655 656 /* enable/disable interrupts, BC_LVL for SNK and COMP_CHNG for SRC */ 657 switch (cc) { 658 case TYPEC_CC_RP_DEF: 659 case TYPEC_CC_RP_1_5: 660 case TYPEC_CC_RP_3_0: 661 rd_mda = rd_mda_value[cc_src_current[cc]]; 662 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda); 663 if (ret < 0) { 664 fusb302_log(chip, 665 "cannot set SRC measure value, ret=%d", 666 ret); 667 goto done; 668 } 669 ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK, 670 FUSB_REG_MASK_BC_LVL | 671 FUSB_REG_MASK_COMP_CHNG, 672 FUSB_REG_MASK_COMP_CHNG); 673 if (ret < 0) { 674 fusb302_log(chip, "cannot set SRC interrupt, ret=%d", 675 ret); 676 goto done; 677 } 678 chip->intr_comp_chng = true; 679 break; 680 case TYPEC_CC_RD: 681 ret = fusb302_i2c_mask_write(chip, FUSB_REG_MASK, 682 FUSB_REG_MASK_BC_LVL | 683 FUSB_REG_MASK_COMP_CHNG, 684 FUSB_REG_MASK_BC_LVL); 685 if (ret < 0) { 686 fusb302_log(chip, "cannot set SRC interrupt, ret=%d", 687 ret); 688 goto done; 689 } 690 chip->intr_bc_lvl = true; 691 break; 692 default: 693 break; 694 } 695 done: 696 mutex_unlock(&chip->lock); 697 698 return ret; 699 } 700 701 static int tcpm_get_cc(struct tcpc_dev *dev, enum typec_cc_status *cc1, 702 enum typec_cc_status *cc2) 703 { 704 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 705 tcpc_dev); 706 707 mutex_lock(&chip->lock); 708 *cc1 = chip->cc1; 709 *cc2 = chip->cc2; 710 fusb302_log(chip, "cc1=%s, cc2=%s", typec_cc_status_name[*cc1], 711 typec_cc_status_name[*cc2]); 712 mutex_unlock(&chip->lock); 713 714 return 0; 715 } 716 717 static int tcpm_set_polarity(struct tcpc_dev *dev, 718 enum typec_cc_polarity polarity) 719 { 720 return 0; 721 } 722 723 static int tcpm_set_vconn(struct tcpc_dev *dev, bool on) 724 { 725 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 726 tcpc_dev); 727 int ret = 0; 728 u8 switches0_data = 0x00; 729 u8 switches0_mask = FUSB_REG_SWITCHES0_VCONN_CC1 | 730 FUSB_REG_SWITCHES0_VCONN_CC2; 731 732 mutex_lock(&chip->lock); 733 if (chip->vconn_on == on) { 734 fusb302_log(chip, "vconn is already %s", on ? "On" : "Off"); 735 goto done; 736 } 737 if (on) { 738 switches0_data = (chip->cc_polarity == TYPEC_POLARITY_CC1) ? 739 FUSB_REG_SWITCHES0_VCONN_CC2 : 740 FUSB_REG_SWITCHES0_VCONN_CC1; 741 } 742 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES0, 743 switches0_mask, switches0_data); 744 if (ret < 0) 745 goto done; 746 chip->vconn_on = on; 747 fusb302_log(chip, "vconn := %s", on ? "On" : "Off"); 748 done: 749 mutex_unlock(&chip->lock); 750 751 return ret; 752 } 753 754 static int tcpm_set_vbus(struct tcpc_dev *dev, bool on, bool charge) 755 { 756 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 757 tcpc_dev); 758 int ret = 0; 759 760 mutex_lock(&chip->lock); 761 if (chip->vbus_on == on) { 762 fusb302_log(chip, "vbus is already %s", on ? "On" : "Off"); 763 } else { 764 if (on) 765 ret = regulator_enable(chip->vbus); 766 else 767 ret = regulator_disable(chip->vbus); 768 if (ret < 0) { 769 fusb302_log(chip, "cannot %s vbus regulator, ret=%d", 770 on ? "enable" : "disable", ret); 771 goto done; 772 } 773 chip->vbus_on = on; 774 fusb302_log(chip, "vbus := %s", on ? "On" : "Off"); 775 } 776 if (chip->charge_on == charge) 777 fusb302_log(chip, "charge is already %s", 778 charge ? "On" : "Off"); 779 else 780 chip->charge_on = charge; 781 782 done: 783 mutex_unlock(&chip->lock); 784 785 return ret; 786 } 787 788 static int fusb302_pd_tx_flush(struct fusb302_chip *chip) 789 { 790 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL0, 791 FUSB_REG_CONTROL0_TX_FLUSH); 792 } 793 794 static int fusb302_pd_rx_flush(struct fusb302_chip *chip) 795 { 796 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL1, 797 FUSB_REG_CONTROL1_RX_FLUSH); 798 } 799 800 static int fusb302_pd_set_auto_goodcrc(struct fusb302_chip *chip, bool on) 801 { 802 if (on) 803 return fusb302_i2c_set_bits(chip, FUSB_REG_SWITCHES1, 804 FUSB_REG_SWITCHES1_AUTO_GCRC); 805 return fusb302_i2c_clear_bits(chip, FUSB_REG_SWITCHES1, 806 FUSB_REG_SWITCHES1_AUTO_GCRC); 807 } 808 809 static int fusb302_pd_set_interrupts(struct fusb302_chip *chip, bool on) 810 { 811 int ret = 0; 812 u8 mask_interrupts = FUSB_REG_MASK_COLLISION; 813 u8 maska_interrupts = FUSB_REG_MASKA_RETRYFAIL | 814 FUSB_REG_MASKA_HARDSENT | 815 FUSB_REG_MASKA_TX_SUCCESS | 816 FUSB_REG_MASKA_HARDRESET; 817 u8 maskb_interrupts = FUSB_REG_MASKB_GCRCSENT; 818 819 ret = on ? 820 fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, mask_interrupts) : 821 fusb302_i2c_set_bits(chip, FUSB_REG_MASK, mask_interrupts); 822 if (ret < 0) 823 return ret; 824 ret = on ? 825 fusb302_i2c_clear_bits(chip, FUSB_REG_MASKA, maska_interrupts) : 826 fusb302_i2c_set_bits(chip, FUSB_REG_MASKA, maska_interrupts); 827 if (ret < 0) 828 return ret; 829 ret = on ? 830 fusb302_i2c_clear_bits(chip, FUSB_REG_MASKB, maskb_interrupts) : 831 fusb302_i2c_set_bits(chip, FUSB_REG_MASKB, maskb_interrupts); 832 return ret; 833 } 834 835 static int tcpm_set_pd_rx(struct tcpc_dev *dev, bool on) 836 { 837 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 838 tcpc_dev); 839 int ret = 0; 840 841 mutex_lock(&chip->lock); 842 ret = fusb302_pd_rx_flush(chip); 843 if (ret < 0) { 844 fusb302_log(chip, "cannot flush pd rx buffer, ret=%d", ret); 845 goto done; 846 } 847 ret = fusb302_pd_tx_flush(chip); 848 if (ret < 0) { 849 fusb302_log(chip, "cannot flush pd tx buffer, ret=%d", ret); 850 goto done; 851 } 852 ret = fusb302_pd_set_auto_goodcrc(chip, on); 853 if (ret < 0) { 854 fusb302_log(chip, "cannot turn %s auto GCRC, ret=%d", 855 on ? "on" : "off", ret); 856 goto done; 857 } 858 ret = fusb302_pd_set_interrupts(chip, on); 859 if (ret < 0) { 860 fusb302_log(chip, "cannot turn %s pd interrupts, ret=%d", 861 on ? "on" : "off", ret); 862 goto done; 863 } 864 fusb302_log(chip, "pd := %s", on ? "on" : "off"); 865 done: 866 mutex_unlock(&chip->lock); 867 868 return ret; 869 } 870 871 static const char * const typec_role_name[] = { 872 [TYPEC_SINK] = "Sink", 873 [TYPEC_SOURCE] = "Source", 874 }; 875 876 static const char * const typec_data_role_name[] = { 877 [TYPEC_DEVICE] = "Device", 878 [TYPEC_HOST] = "Host", 879 }; 880 881 static int tcpm_set_roles(struct tcpc_dev *dev, bool attached, 882 enum typec_role pwr, enum typec_data_role data) 883 { 884 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 885 tcpc_dev); 886 int ret = 0; 887 u8 switches1_mask = FUSB_REG_SWITCHES1_POWERROLE | 888 FUSB_REG_SWITCHES1_DATAROLE; 889 u8 switches1_data = 0x00; 890 891 mutex_lock(&chip->lock); 892 if (pwr == TYPEC_SOURCE) 893 switches1_data |= FUSB_REG_SWITCHES1_POWERROLE; 894 if (data == TYPEC_HOST) 895 switches1_data |= FUSB_REG_SWITCHES1_DATAROLE; 896 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES1, 897 switches1_mask, switches1_data); 898 if (ret < 0) { 899 fusb302_log(chip, "unable to set pd header %s, %s, ret=%d", 900 typec_role_name[pwr], typec_data_role_name[data], 901 ret); 902 goto done; 903 } 904 fusb302_log(chip, "pd header := %s, %s", typec_role_name[pwr], 905 typec_data_role_name[data]); 906 done: 907 mutex_unlock(&chip->lock); 908 909 return ret; 910 } 911 912 static int tcpm_start_toggling(struct tcpc_dev *dev, 913 enum typec_port_type port_type, 914 enum typec_cc_status cc) 915 { 916 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 917 tcpc_dev); 918 enum toggling_mode mode = TOGGLING_MODE_OFF; 919 int ret = 0; 920 921 switch (port_type) { 922 case TYPEC_PORT_SRC: 923 mode = TOGGLING_MODE_SRC; 924 break; 925 case TYPEC_PORT_SNK: 926 mode = TOGGLING_MODE_SNK; 927 break; 928 case TYPEC_PORT_DRP: 929 mode = TOGGLING_MODE_DRP; 930 break; 931 } 932 933 mutex_lock(&chip->lock); 934 ret = fusb302_set_src_current(chip, cc_src_current[cc]); 935 if (ret < 0) { 936 fusb302_log(chip, "unable to set src current %s, ret=%d", 937 typec_cc_status_name[cc], ret); 938 goto done; 939 } 940 ret = fusb302_set_toggling(chip, mode); 941 if (ret < 0) { 942 fusb302_log(chip, 943 "unable to start drp toggling, ret=%d", ret); 944 goto done; 945 } 946 fusb302_log(chip, "start drp toggling"); 947 done: 948 mutex_unlock(&chip->lock); 949 950 return ret; 951 } 952 953 static int fusb302_pd_send_message(struct fusb302_chip *chip, 954 const struct pd_message *msg) 955 { 956 int ret = 0; 957 u8 buf[40]; 958 u8 pos = 0; 959 int len; 960 961 /* SOP tokens */ 962 buf[pos++] = FUSB302_TKN_SYNC1; 963 buf[pos++] = FUSB302_TKN_SYNC1; 964 buf[pos++] = FUSB302_TKN_SYNC1; 965 buf[pos++] = FUSB302_TKN_SYNC2; 966 967 len = pd_header_cnt_le(msg->header) * 4; 968 /* plug 2 for header */ 969 len += 2; 970 if (len > 0x1F) { 971 fusb302_log(chip, 972 "PD message too long %d (incl. header)", len); 973 return -EINVAL; 974 } 975 /* packsym tells the FUSB302 chip that the next X bytes are payload */ 976 buf[pos++] = FUSB302_TKN_PACKSYM | (len & 0x1F); 977 memcpy(&buf[pos], &msg->header, sizeof(msg->header)); 978 pos += sizeof(msg->header); 979 980 len -= 2; 981 memcpy(&buf[pos], msg->payload, len); 982 pos += len; 983 984 /* CRC */ 985 buf[pos++] = FUSB302_TKN_JAMCRC; 986 /* EOP */ 987 buf[pos++] = FUSB302_TKN_EOP; 988 /* turn tx off after sending message */ 989 buf[pos++] = FUSB302_TKN_TXOFF; 990 /* start transmission */ 991 buf[pos++] = FUSB302_TKN_TXON; 992 993 ret = fusb302_i2c_block_write(chip, FUSB_REG_FIFOS, pos, buf); 994 if (ret < 0) 995 return ret; 996 fusb302_log(chip, "sending PD message header: %x", msg->header); 997 fusb302_log(chip, "sending PD message len: %d", len); 998 999 return ret; 1000 } 1001 1002 static int fusb302_pd_send_hardreset(struct fusb302_chip *chip) 1003 { 1004 return fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3, 1005 FUSB_REG_CONTROL3_SEND_HARDRESET); 1006 } 1007 1008 static const char * const transmit_type_name[] = { 1009 [TCPC_TX_SOP] = "SOP", 1010 [TCPC_TX_SOP_PRIME] = "SOP'", 1011 [TCPC_TX_SOP_PRIME_PRIME] = "SOP''", 1012 [TCPC_TX_SOP_DEBUG_PRIME] = "DEBUG'", 1013 [TCPC_TX_SOP_DEBUG_PRIME_PRIME] = "DEBUG''", 1014 [TCPC_TX_HARD_RESET] = "HARD_RESET", 1015 [TCPC_TX_CABLE_RESET] = "CABLE_RESET", 1016 [TCPC_TX_BIST_MODE_2] = "BIST_MODE_2", 1017 }; 1018 1019 static int tcpm_pd_transmit(struct tcpc_dev *dev, enum tcpm_transmit_type type, 1020 const struct pd_message *msg, unsigned int negotiated_rev) 1021 { 1022 struct fusb302_chip *chip = container_of(dev, struct fusb302_chip, 1023 tcpc_dev); 1024 int ret = 0; 1025 1026 mutex_lock(&chip->lock); 1027 switch (type) { 1028 case TCPC_TX_SOP: 1029 /* nRetryCount 3 in P2.0 spec, whereas 2 in PD3.0 spec */ 1030 ret = fusb302_enable_tx_auto_retries(chip, negotiated_rev > PD_REV20 ? 1031 FUSB_REG_CONTROL3_N_RETRIES_2 : 1032 FUSB_REG_CONTROL3_N_RETRIES_3); 1033 if (ret < 0) 1034 fusb302_log(chip, "Cannot update retry count ret=%d", ret); 1035 1036 ret = fusb302_pd_send_message(chip, msg); 1037 if (ret < 0) 1038 fusb302_log(chip, 1039 "cannot send PD message, ret=%d", ret); 1040 break; 1041 case TCPC_TX_HARD_RESET: 1042 ret = fusb302_pd_send_hardreset(chip); 1043 if (ret < 0) 1044 fusb302_log(chip, 1045 "cannot send hardreset, ret=%d", ret); 1046 break; 1047 default: 1048 fusb302_log(chip, "type %s not supported", 1049 transmit_type_name[type]); 1050 ret = -EINVAL; 1051 } 1052 mutex_unlock(&chip->lock); 1053 1054 return ret; 1055 } 1056 1057 static enum typec_cc_status fusb302_bc_lvl_to_cc(u8 bc_lvl) 1058 { 1059 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_1230_MAX) 1060 return TYPEC_CC_RP_3_0; 1061 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_600_1230) 1062 return TYPEC_CC_RP_1_5; 1063 if (bc_lvl == FUSB_REG_STATUS0_BC_LVL_200_600) 1064 return TYPEC_CC_RP_DEF; 1065 return TYPEC_CC_OPEN; 1066 } 1067 1068 static void fusb302_bc_lvl_handler_work(struct work_struct *work) 1069 { 1070 struct fusb302_chip *chip = container_of(work, struct fusb302_chip, 1071 bc_lvl_handler.work); 1072 int ret = 0; 1073 u8 status0; 1074 u8 bc_lvl; 1075 enum typec_cc_status cc_status; 1076 1077 mutex_lock(&chip->lock); 1078 if (!chip->intr_bc_lvl) { 1079 fusb302_log(chip, "BC_LVL interrupt is turned off, abort"); 1080 goto done; 1081 } 1082 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); 1083 if (ret < 0) 1084 goto done; 1085 fusb302_log(chip, "BC_LVL handler, status0=0x%02x", status0); 1086 if (status0 & FUSB_REG_STATUS0_ACTIVITY) { 1087 fusb302_log(chip, "CC activities detected, delay handling"); 1088 mod_delayed_work(chip->wq, &chip->bc_lvl_handler, 1089 msecs_to_jiffies(T_BC_LVL_DEBOUNCE_DELAY_MS)); 1090 goto done; 1091 } 1092 bc_lvl = status0 & FUSB_REG_STATUS0_BC_LVL_MASK; 1093 cc_status = fusb302_bc_lvl_to_cc(bc_lvl); 1094 if (chip->cc_polarity == TYPEC_POLARITY_CC1) { 1095 if (chip->cc1 != cc_status) { 1096 fusb302_log(chip, "cc1: %s -> %s", 1097 typec_cc_status_name[chip->cc1], 1098 typec_cc_status_name[cc_status]); 1099 chip->cc1 = cc_status; 1100 tcpm_cc_change(chip->tcpm_port); 1101 } 1102 } else { 1103 if (chip->cc2 != cc_status) { 1104 fusb302_log(chip, "cc2: %s -> %s", 1105 typec_cc_status_name[chip->cc2], 1106 typec_cc_status_name[cc_status]); 1107 chip->cc2 = cc_status; 1108 tcpm_cc_change(chip->tcpm_port); 1109 } 1110 } 1111 1112 done: 1113 mutex_unlock(&chip->lock); 1114 } 1115 1116 static void init_tcpc_dev(struct tcpc_dev *fusb302_tcpc_dev) 1117 { 1118 fusb302_tcpc_dev->init = tcpm_init; 1119 fusb302_tcpc_dev->get_vbus = tcpm_get_vbus; 1120 fusb302_tcpc_dev->get_current_limit = tcpm_get_current_limit; 1121 fusb302_tcpc_dev->set_cc = tcpm_set_cc; 1122 fusb302_tcpc_dev->get_cc = tcpm_get_cc; 1123 fusb302_tcpc_dev->set_polarity = tcpm_set_polarity; 1124 fusb302_tcpc_dev->set_vconn = tcpm_set_vconn; 1125 fusb302_tcpc_dev->set_vbus = tcpm_set_vbus; 1126 fusb302_tcpc_dev->set_pd_rx = tcpm_set_pd_rx; 1127 fusb302_tcpc_dev->set_roles = tcpm_set_roles; 1128 fusb302_tcpc_dev->start_toggling = tcpm_start_toggling; 1129 fusb302_tcpc_dev->pd_transmit = tcpm_pd_transmit; 1130 } 1131 1132 static const char * const cc_polarity_name[] = { 1133 [TYPEC_POLARITY_CC1] = "Polarity_CC1", 1134 [TYPEC_POLARITY_CC2] = "Polarity_CC2", 1135 }; 1136 1137 static int fusb302_set_cc_polarity_and_pull(struct fusb302_chip *chip, 1138 enum typec_cc_polarity cc_polarity, 1139 bool pull_up, bool pull_down) 1140 { 1141 int ret = 0; 1142 u8 switches0_data = 0x00; 1143 u8 switches1_mask = FUSB_REG_SWITCHES1_TXCC1_EN | 1144 FUSB_REG_SWITCHES1_TXCC2_EN; 1145 u8 switches1_data = 0x00; 1146 1147 if (pull_down) 1148 switches0_data |= FUSB_REG_SWITCHES0_CC1_PD_EN | 1149 FUSB_REG_SWITCHES0_CC2_PD_EN; 1150 1151 if (cc_polarity == TYPEC_POLARITY_CC1) { 1152 switches0_data |= FUSB_REG_SWITCHES0_MEAS_CC1; 1153 if (chip->vconn_on) 1154 switches0_data |= FUSB_REG_SWITCHES0_VCONN_CC2; 1155 if (pull_up) 1156 switches0_data |= FUSB_REG_SWITCHES0_CC1_PU_EN; 1157 switches1_data = FUSB_REG_SWITCHES1_TXCC1_EN; 1158 } else { 1159 switches0_data |= FUSB_REG_SWITCHES0_MEAS_CC2; 1160 if (chip->vconn_on) 1161 switches0_data |= FUSB_REG_SWITCHES0_VCONN_CC1; 1162 if (pull_up) 1163 switches0_data |= FUSB_REG_SWITCHES0_CC2_PU_EN; 1164 switches1_data = FUSB_REG_SWITCHES1_TXCC2_EN; 1165 } 1166 ret = fusb302_i2c_write(chip, FUSB_REG_SWITCHES0, switches0_data); 1167 if (ret < 0) 1168 return ret; 1169 ret = fusb302_i2c_mask_write(chip, FUSB_REG_SWITCHES1, 1170 switches1_mask, switches1_data); 1171 if (ret < 0) 1172 return ret; 1173 chip->cc_polarity = cc_polarity; 1174 1175 return ret; 1176 } 1177 1178 static int fusb302_handle_togdone_snk(struct fusb302_chip *chip, 1179 u8 togdone_result) 1180 { 1181 int ret = 0; 1182 u8 status0; 1183 u8 bc_lvl; 1184 enum typec_cc_polarity cc_polarity; 1185 enum typec_cc_status cc_status_active, cc1, cc2; 1186 1187 /* set polarity and pull_up, pull_down */ 1188 cc_polarity = (togdone_result == FUSB_REG_STATUS1A_TOGSS_SNK1) ? 1189 TYPEC_POLARITY_CC1 : TYPEC_POLARITY_CC2; 1190 ret = fusb302_set_cc_polarity_and_pull(chip, cc_polarity, false, true); 1191 if (ret < 0) { 1192 fusb302_log(chip, "cannot set cc polarity %s, ret=%d", 1193 cc_polarity_name[cc_polarity], ret); 1194 return ret; 1195 } 1196 /* fusb302_set_cc_polarity() has set the correct measure block */ 1197 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); 1198 if (ret < 0) 1199 return ret; 1200 bc_lvl = status0 & FUSB_REG_STATUS0_BC_LVL_MASK; 1201 cc_status_active = fusb302_bc_lvl_to_cc(bc_lvl); 1202 /* restart toggling if the cc status on the active line is OPEN */ 1203 if (cc_status_active == TYPEC_CC_OPEN) { 1204 fusb302_log(chip, "restart toggling as CC_OPEN detected"); 1205 ret = fusb302_set_toggling(chip, chip->toggling_mode); 1206 return ret; 1207 } 1208 /* update tcpm with the new cc value */ 1209 cc1 = (cc_polarity == TYPEC_POLARITY_CC1) ? 1210 cc_status_active : TYPEC_CC_OPEN; 1211 cc2 = (cc_polarity == TYPEC_POLARITY_CC2) ? 1212 cc_status_active : TYPEC_CC_OPEN; 1213 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) { 1214 chip->cc1 = cc1; 1215 chip->cc2 = cc2; 1216 tcpm_cc_change(chip->tcpm_port); 1217 } 1218 /* turn off toggling */ 1219 ret = fusb302_set_toggling(chip, TOGGLING_MODE_OFF); 1220 if (ret < 0) { 1221 fusb302_log(chip, 1222 "cannot set toggling mode off, ret=%d", ret); 1223 return ret; 1224 } 1225 /* unmask bc_lvl interrupt */ 1226 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, FUSB_REG_MASK_BC_LVL); 1227 if (ret < 0) { 1228 fusb302_log(chip, 1229 "cannot unmask bc_lcl interrupt, ret=%d", ret); 1230 return ret; 1231 } 1232 chip->intr_bc_lvl = true; 1233 fusb302_log(chip, "detected cc1=%s, cc2=%s", 1234 typec_cc_status_name[cc1], 1235 typec_cc_status_name[cc2]); 1236 1237 return ret; 1238 } 1239 1240 /* On error returns < 0, otherwise a typec_cc_status value */ 1241 static int fusb302_get_src_cc_status(struct fusb302_chip *chip, 1242 enum typec_cc_polarity cc_polarity, 1243 enum typec_cc_status *cc) 1244 { 1245 u8 ra_mda = ra_mda_value[chip->src_current_status]; 1246 u8 rd_mda = rd_mda_value[chip->src_current_status]; 1247 u8 switches0_data, status0; 1248 int ret; 1249 1250 /* Step 1: Set switches so that we measure the right CC pin */ 1251 switches0_data = (cc_polarity == TYPEC_POLARITY_CC1) ? 1252 FUSB_REG_SWITCHES0_CC1_PU_EN | FUSB_REG_SWITCHES0_MEAS_CC1 : 1253 FUSB_REG_SWITCHES0_CC2_PU_EN | FUSB_REG_SWITCHES0_MEAS_CC2; 1254 ret = fusb302_i2c_write(chip, FUSB_REG_SWITCHES0, switches0_data); 1255 if (ret < 0) 1256 return ret; 1257 1258 fusb302_i2c_read(chip, FUSB_REG_SWITCHES0, &status0); 1259 fusb302_log(chip, "get_src_cc_status switches: 0x%0x", status0); 1260 1261 /* Step 2: Set compararator volt to differentiate between Open and Rd */ 1262 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda); 1263 if (ret < 0) 1264 return ret; 1265 1266 usleep_range(50, 100); 1267 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); 1268 if (ret < 0) 1269 return ret; 1270 1271 fusb302_log(chip, "get_src_cc_status rd_mda status0: 0x%0x", status0); 1272 if (status0 & FUSB_REG_STATUS0_COMP) { 1273 *cc = TYPEC_CC_OPEN; 1274 return 0; 1275 } 1276 1277 /* Step 3: Set compararator input to differentiate between Rd and Ra. */ 1278 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, ra_mda); 1279 if (ret < 0) 1280 return ret; 1281 1282 usleep_range(50, 100); 1283 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); 1284 if (ret < 0) 1285 return ret; 1286 1287 fusb302_log(chip, "get_src_cc_status ra_mda status0: 0x%0x", status0); 1288 if (status0 & FUSB_REG_STATUS0_COMP) 1289 *cc = TYPEC_CC_RD; 1290 else 1291 *cc = TYPEC_CC_RA; 1292 1293 return 0; 1294 } 1295 1296 static int fusb302_handle_togdone_src(struct fusb302_chip *chip, 1297 u8 togdone_result) 1298 { 1299 /* 1300 * - set polarity (measure cc, vconn, tx) 1301 * - set pull_up, pull_down 1302 * - set cc1, cc2, and update to tcpm_port 1303 * - set I_COMP interrupt on 1304 */ 1305 int ret = 0; 1306 u8 rd_mda = rd_mda_value[chip->src_current_status]; 1307 enum toggling_mode toggling_mode = chip->toggling_mode; 1308 enum typec_cc_polarity cc_polarity; 1309 enum typec_cc_status cc1, cc2; 1310 1311 /* 1312 * The toggle-engine will stop in a src state if it sees either Ra or 1313 * Rd. Determine the status for both CC pins, starting with the one 1314 * where toggling stopped, as that is where the switches point now. 1315 */ 1316 if (togdone_result == FUSB_REG_STATUS1A_TOGSS_SRC1) 1317 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC1, &cc1); 1318 else 1319 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC2, &cc2); 1320 if (ret < 0) 1321 return ret; 1322 /* we must turn off toggling before we can measure the other pin */ 1323 ret = fusb302_set_toggling(chip, TOGGLING_MODE_OFF); 1324 if (ret < 0) { 1325 fusb302_log(chip, "cannot set toggling mode off, ret=%d", ret); 1326 return ret; 1327 } 1328 /* get the status of the other pin */ 1329 if (togdone_result == FUSB_REG_STATUS1A_TOGSS_SRC1) 1330 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC2, &cc2); 1331 else 1332 ret = fusb302_get_src_cc_status(chip, TYPEC_POLARITY_CC1, &cc1); 1333 if (ret < 0) 1334 return ret; 1335 1336 /* determine polarity based on the status of both pins */ 1337 if (cc1 == TYPEC_CC_RD && 1338 (cc2 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_RA)) { 1339 cc_polarity = TYPEC_POLARITY_CC1; 1340 } else if (cc2 == TYPEC_CC_RD && 1341 (cc1 == TYPEC_CC_OPEN || cc1 == TYPEC_CC_RA)) { 1342 cc_polarity = TYPEC_POLARITY_CC2; 1343 } else { 1344 fusb302_log(chip, "unexpected CC status cc1=%s, cc2=%s, restarting toggling", 1345 typec_cc_status_name[cc1], 1346 typec_cc_status_name[cc2]); 1347 return fusb302_set_toggling(chip, toggling_mode); 1348 } 1349 /* set polarity and pull_up, pull_down */ 1350 ret = fusb302_set_cc_polarity_and_pull(chip, cc_polarity, true, false); 1351 if (ret < 0) { 1352 fusb302_log(chip, "cannot set cc polarity %s, ret=%d", 1353 cc_polarity_name[cc_polarity], ret); 1354 return ret; 1355 } 1356 /* update tcpm with the new cc value */ 1357 if ((chip->cc1 != cc1) || (chip->cc2 != cc2)) { 1358 chip->cc1 = cc1; 1359 chip->cc2 = cc2; 1360 tcpm_cc_change(chip->tcpm_port); 1361 } 1362 /* set MDAC to Rd threshold, and unmask I_COMP for unplug detection */ 1363 ret = fusb302_i2c_write(chip, FUSB_REG_MEASURE, rd_mda); 1364 if (ret < 0) 1365 return ret; 1366 /* unmask comp_chng interrupt */ 1367 ret = fusb302_i2c_clear_bits(chip, FUSB_REG_MASK, 1368 FUSB_REG_MASK_COMP_CHNG); 1369 if (ret < 0) { 1370 fusb302_log(chip, 1371 "cannot unmask comp_chng interrupt, ret=%d", ret); 1372 return ret; 1373 } 1374 chip->intr_comp_chng = true; 1375 fusb302_log(chip, "detected cc1=%s, cc2=%s", 1376 typec_cc_status_name[cc1], 1377 typec_cc_status_name[cc2]); 1378 1379 return ret; 1380 } 1381 1382 static int fusb302_handle_togdone(struct fusb302_chip *chip) 1383 { 1384 int ret = 0; 1385 u8 status1a; 1386 u8 togdone_result; 1387 1388 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS1A, &status1a); 1389 if (ret < 0) 1390 return ret; 1391 togdone_result = (status1a >> FUSB_REG_STATUS1A_TOGSS_POS) & 1392 FUSB_REG_STATUS1A_TOGSS_MASK; 1393 switch (togdone_result) { 1394 case FUSB_REG_STATUS1A_TOGSS_SNK1: 1395 case FUSB_REG_STATUS1A_TOGSS_SNK2: 1396 return fusb302_handle_togdone_snk(chip, togdone_result); 1397 case FUSB_REG_STATUS1A_TOGSS_SRC1: 1398 case FUSB_REG_STATUS1A_TOGSS_SRC2: 1399 return fusb302_handle_togdone_src(chip, togdone_result); 1400 case FUSB_REG_STATUS1A_TOGSS_AA: 1401 /* doesn't support */ 1402 fusb302_log(chip, "AudioAccessory not supported"); 1403 fusb302_set_toggling(chip, chip->toggling_mode); 1404 break; 1405 default: 1406 fusb302_log(chip, "TOGDONE with an invalid state: %d", 1407 togdone_result); 1408 fusb302_set_toggling(chip, chip->toggling_mode); 1409 break; 1410 } 1411 return ret; 1412 } 1413 1414 static int fusb302_pd_reset(struct fusb302_chip *chip) 1415 { 1416 return fusb302_i2c_set_bits(chip, FUSB_REG_RESET, 1417 FUSB_REG_RESET_PD_RESET); 1418 } 1419 1420 static int fusb302_pd_read_message(struct fusb302_chip *chip, 1421 struct pd_message *msg) 1422 { 1423 int ret = 0; 1424 u8 token; 1425 u8 crc[4]; 1426 int len; 1427 1428 /* first SOP token */ 1429 ret = fusb302_i2c_read(chip, FUSB_REG_FIFOS, &token); 1430 if (ret < 0) 1431 return ret; 1432 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, 2, 1433 (u8 *)&msg->header); 1434 if (ret < 0) 1435 return ret; 1436 len = pd_header_cnt_le(msg->header) * 4; 1437 /* add 4 to length to include the CRC */ 1438 if (len > PD_MAX_PAYLOAD * 4) { 1439 fusb302_log(chip, "PD message too long %d", len); 1440 return -EINVAL; 1441 } 1442 if (len > 0) { 1443 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, len, 1444 (u8 *)msg->payload); 1445 if (ret < 0) 1446 return ret; 1447 } 1448 /* another 4 bytes to read CRC out */ 1449 ret = fusb302_i2c_block_read(chip, FUSB_REG_FIFOS, 4, crc); 1450 if (ret < 0) 1451 return ret; 1452 fusb302_log(chip, "PD message header: %x", msg->header); 1453 fusb302_log(chip, "PD message len: %d", len); 1454 1455 /* 1456 * Check if we've read off a GoodCRC message. If so then indicate to 1457 * TCPM that the previous transmission has completed. Otherwise we pass 1458 * the received message over to TCPM for processing. 1459 * 1460 * We make this check here instead of basing the reporting decision on 1461 * the IRQ event type, as it's possible for the chip to report the 1462 * TX_SUCCESS and GCRCSENT events out of order on occasion, so we need 1463 * to check the message type to ensure correct reporting to TCPM. 1464 */ 1465 if ((!len) && (pd_header_type_le(msg->header) == PD_CTRL_GOOD_CRC)) 1466 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS); 1467 else 1468 tcpm_pd_receive(chip->tcpm_port, msg); 1469 1470 return ret; 1471 } 1472 1473 static irqreturn_t fusb302_irq_intn(int irq, void *dev_id) 1474 { 1475 struct fusb302_chip *chip = dev_id; 1476 unsigned long flags; 1477 1478 /* Disable our level triggered IRQ until our irq_work has cleared it */ 1479 disable_irq_nosync(chip->gpio_int_n_irq); 1480 1481 spin_lock_irqsave(&chip->irq_lock, flags); 1482 if (chip->irq_suspended) 1483 chip->irq_while_suspended = true; 1484 else 1485 schedule_work(&chip->irq_work); 1486 spin_unlock_irqrestore(&chip->irq_lock, flags); 1487 1488 return IRQ_HANDLED; 1489 } 1490 1491 static void fusb302_irq_work(struct work_struct *work) 1492 { 1493 struct fusb302_chip *chip = container_of(work, struct fusb302_chip, 1494 irq_work); 1495 int ret = 0; 1496 u8 interrupt; 1497 u8 interrupta; 1498 u8 interruptb; 1499 u8 status0; 1500 bool vbus_present; 1501 bool comp_result; 1502 bool intr_togdone; 1503 bool intr_bc_lvl; 1504 bool intr_comp_chng; 1505 struct pd_message pd_msg; 1506 1507 mutex_lock(&chip->lock); 1508 /* grab a snapshot of intr flags */ 1509 intr_togdone = chip->intr_togdone; 1510 intr_bc_lvl = chip->intr_bc_lvl; 1511 intr_comp_chng = chip->intr_comp_chng; 1512 1513 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPT, &interrupt); 1514 if (ret < 0) 1515 goto done; 1516 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPTA, &interrupta); 1517 if (ret < 0) 1518 goto done; 1519 ret = fusb302_i2c_read(chip, FUSB_REG_INTERRUPTB, &interruptb); 1520 if (ret < 0) 1521 goto done; 1522 ret = fusb302_i2c_read(chip, FUSB_REG_STATUS0, &status0); 1523 if (ret < 0) 1524 goto done; 1525 fusb302_log(chip, 1526 "IRQ: 0x%02x, a: 0x%02x, b: 0x%02x, status0: 0x%02x", 1527 interrupt, interrupta, interruptb, status0); 1528 1529 if (interrupt & FUSB_REG_INTERRUPT_VBUSOK) { 1530 vbus_present = !!(status0 & FUSB_REG_STATUS0_VBUSOK); 1531 fusb302_log(chip, "IRQ: VBUS_OK, vbus=%s", 1532 vbus_present ? "On" : "Off"); 1533 if (vbus_present != chip->vbus_present) { 1534 chip->vbus_present = vbus_present; 1535 tcpm_vbus_change(chip->tcpm_port); 1536 } 1537 } 1538 1539 if ((interrupta & FUSB_REG_INTERRUPTA_TOGDONE) && intr_togdone) { 1540 fusb302_log(chip, "IRQ: TOGDONE"); 1541 ret = fusb302_handle_togdone(chip); 1542 if (ret < 0) { 1543 fusb302_log(chip, 1544 "handle togdone error, ret=%d", ret); 1545 goto done; 1546 } 1547 } 1548 1549 if ((interrupt & FUSB_REG_INTERRUPT_BC_LVL) && intr_bc_lvl) { 1550 fusb302_log(chip, "IRQ: BC_LVL, handler pending"); 1551 /* 1552 * as BC_LVL interrupt can be affected by PD activity, 1553 * apply delay to for the handler to wait for the PD 1554 * signaling to finish. 1555 */ 1556 mod_delayed_work(chip->wq, &chip->bc_lvl_handler, 1557 msecs_to_jiffies(T_BC_LVL_DEBOUNCE_DELAY_MS)); 1558 } 1559 1560 if ((interrupt & FUSB_REG_INTERRUPT_COMP_CHNG) && intr_comp_chng) { 1561 comp_result = !!(status0 & FUSB_REG_STATUS0_COMP); 1562 fusb302_log(chip, "IRQ: COMP_CHNG, comp=%s", 1563 comp_result ? "true" : "false"); 1564 if (comp_result) { 1565 /* cc level > Rd_threshold, detach */ 1566 chip->cc1 = TYPEC_CC_OPEN; 1567 chip->cc2 = TYPEC_CC_OPEN; 1568 tcpm_cc_change(chip->tcpm_port); 1569 } 1570 } 1571 1572 if (interrupt & FUSB_REG_INTERRUPT_COLLISION) { 1573 fusb302_log(chip, "IRQ: PD collision"); 1574 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_FAILED); 1575 } 1576 1577 if (interrupta & FUSB_REG_INTERRUPTA_RETRYFAIL) { 1578 fusb302_log(chip, "IRQ: PD retry failed"); 1579 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_FAILED); 1580 } 1581 1582 if (interrupta & FUSB_REG_INTERRUPTA_HARDSENT) { 1583 fusb302_log(chip, "IRQ: PD hardreset sent"); 1584 ret = fusb302_pd_reset(chip); 1585 if (ret < 0) { 1586 fusb302_log(chip, "cannot PD reset, ret=%d", ret); 1587 goto done; 1588 } 1589 tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS); 1590 } 1591 1592 if (interrupta & FUSB_REG_INTERRUPTA_TX_SUCCESS) { 1593 fusb302_log(chip, "IRQ: PD tx success"); 1594 ret = fusb302_pd_read_message(chip, &pd_msg); 1595 if (ret < 0) { 1596 fusb302_log(chip, 1597 "cannot read in PD message, ret=%d", ret); 1598 goto done; 1599 } 1600 } 1601 1602 if (interrupta & FUSB_REG_INTERRUPTA_HARDRESET) { 1603 fusb302_log(chip, "IRQ: PD received hardreset"); 1604 ret = fusb302_pd_reset(chip); 1605 if (ret < 0) { 1606 fusb302_log(chip, "cannot PD reset, ret=%d", ret); 1607 goto done; 1608 } 1609 tcpm_pd_hard_reset(chip->tcpm_port); 1610 } 1611 1612 if (interruptb & FUSB_REG_INTERRUPTB_GCRCSENT) { 1613 fusb302_log(chip, "IRQ: PD sent good CRC"); 1614 ret = fusb302_pd_read_message(chip, &pd_msg); 1615 if (ret < 0) { 1616 fusb302_log(chip, 1617 "cannot read in PD message, ret=%d", ret); 1618 goto done; 1619 } 1620 } 1621 done: 1622 mutex_unlock(&chip->lock); 1623 enable_irq(chip->gpio_int_n_irq); 1624 } 1625 1626 static int init_gpio(struct fusb302_chip *chip) 1627 { 1628 struct device *dev = chip->dev; 1629 int ret = 0; 1630 1631 chip->gpio_int_n = devm_gpiod_get(dev, "fcs,int_n", GPIOD_IN); 1632 if (IS_ERR(chip->gpio_int_n)) { 1633 dev_err(dev, "failed to request gpio_int_n\n"); 1634 return PTR_ERR(chip->gpio_int_n); 1635 } 1636 ret = gpiod_to_irq(chip->gpio_int_n); 1637 if (ret < 0) { 1638 dev_err(dev, 1639 "cannot request IRQ for GPIO Int_N, ret=%d", ret); 1640 return ret; 1641 } 1642 chip->gpio_int_n_irq = ret; 1643 return 0; 1644 } 1645 1646 #define PDO_FIXED_FLAGS \ 1647 (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP | PDO_FIXED_USB_COMM) 1648 1649 static const u32 src_pdo[] = { 1650 PDO_FIXED(5000, 400, PDO_FIXED_FLAGS) 1651 }; 1652 1653 static const u32 snk_pdo[] = { 1654 PDO_FIXED(5000, 400, PDO_FIXED_FLAGS) 1655 }; 1656 1657 static const struct property_entry port_props[] = { 1658 PROPERTY_ENTRY_STRING("data-role", "dual"), 1659 PROPERTY_ENTRY_STRING("power-role", "dual"), 1660 PROPERTY_ENTRY_STRING("try-power-role", "sink"), 1661 PROPERTY_ENTRY_U32_ARRAY("source-pdos", src_pdo), 1662 PROPERTY_ENTRY_U32_ARRAY("sink-pdos", snk_pdo), 1663 PROPERTY_ENTRY_U32("op-sink-microwatt", 2500000), 1664 { } 1665 }; 1666 1667 static struct fwnode_handle *fusb302_fwnode_get(struct device *dev) 1668 { 1669 struct fwnode_handle *fwnode; 1670 1671 fwnode = device_get_named_child_node(dev, "connector"); 1672 if (!fwnode) 1673 fwnode = fwnode_create_software_node(port_props, NULL); 1674 1675 return fwnode; 1676 } 1677 1678 static int fusb302_probe(struct i2c_client *client, 1679 const struct i2c_device_id *id) 1680 { 1681 struct fusb302_chip *chip; 1682 struct i2c_adapter *adapter = client->adapter; 1683 struct device *dev = &client->dev; 1684 const char *name; 1685 int ret = 0; 1686 1687 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) { 1688 dev_err(&client->dev, 1689 "I2C/SMBus block functionality not supported!\n"); 1690 return -ENODEV; 1691 } 1692 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 1693 if (!chip) 1694 return -ENOMEM; 1695 1696 chip->i2c_client = client; 1697 chip->dev = &client->dev; 1698 mutex_init(&chip->lock); 1699 1700 /* 1701 * Devicetree platforms should get extcon via phandle (not yet 1702 * supported). On ACPI platforms, we get the name from a device prop. 1703 * This device prop is for kernel internal use only and is expected 1704 * to be set by the platform code which also registers the i2c client 1705 * for the fusb302. 1706 */ 1707 if (device_property_read_string(dev, "linux,extcon-name", &name) == 0) { 1708 chip->extcon = extcon_get_extcon_dev(name); 1709 if (!chip->extcon) 1710 return -EPROBE_DEFER; 1711 } 1712 1713 chip->vbus = devm_regulator_get(chip->dev, "vbus"); 1714 if (IS_ERR(chip->vbus)) 1715 return PTR_ERR(chip->vbus); 1716 1717 chip->wq = create_singlethread_workqueue(dev_name(chip->dev)); 1718 if (!chip->wq) 1719 return -ENOMEM; 1720 1721 spin_lock_init(&chip->irq_lock); 1722 INIT_WORK(&chip->irq_work, fusb302_irq_work); 1723 INIT_DELAYED_WORK(&chip->bc_lvl_handler, fusb302_bc_lvl_handler_work); 1724 init_tcpc_dev(&chip->tcpc_dev); 1725 fusb302_debugfs_init(chip); 1726 1727 if (client->irq) { 1728 chip->gpio_int_n_irq = client->irq; 1729 } else { 1730 ret = init_gpio(chip); 1731 if (ret < 0) 1732 goto destroy_workqueue; 1733 } 1734 1735 chip->tcpc_dev.fwnode = fusb302_fwnode_get(dev); 1736 if (IS_ERR(chip->tcpc_dev.fwnode)) { 1737 ret = PTR_ERR(chip->tcpc_dev.fwnode); 1738 goto destroy_workqueue; 1739 } 1740 1741 chip->tcpm_port = tcpm_register_port(&client->dev, &chip->tcpc_dev); 1742 if (IS_ERR(chip->tcpm_port)) { 1743 fwnode_handle_put(chip->tcpc_dev.fwnode); 1744 ret = PTR_ERR(chip->tcpm_port); 1745 if (ret != -EPROBE_DEFER) 1746 dev_err(dev, "cannot register tcpm port, ret=%d", ret); 1747 goto destroy_workqueue; 1748 } 1749 1750 ret = request_irq(chip->gpio_int_n_irq, fusb302_irq_intn, 1751 IRQF_ONESHOT | IRQF_TRIGGER_LOW, 1752 "fsc_interrupt_int_n", chip); 1753 if (ret < 0) { 1754 dev_err(dev, "cannot request IRQ for GPIO Int_N, ret=%d", ret); 1755 goto tcpm_unregister_port; 1756 } 1757 enable_irq_wake(chip->gpio_int_n_irq); 1758 i2c_set_clientdata(client, chip); 1759 1760 return ret; 1761 1762 tcpm_unregister_port: 1763 tcpm_unregister_port(chip->tcpm_port); 1764 fwnode_handle_put(chip->tcpc_dev.fwnode); 1765 destroy_workqueue: 1766 fusb302_debugfs_exit(chip); 1767 destroy_workqueue(chip->wq); 1768 1769 return ret; 1770 } 1771 1772 static int fusb302_remove(struct i2c_client *client) 1773 { 1774 struct fusb302_chip *chip = i2c_get_clientdata(client); 1775 1776 disable_irq_wake(chip->gpio_int_n_irq); 1777 free_irq(chip->gpio_int_n_irq, chip); 1778 cancel_work_sync(&chip->irq_work); 1779 cancel_delayed_work_sync(&chip->bc_lvl_handler); 1780 tcpm_unregister_port(chip->tcpm_port); 1781 fwnode_handle_put(chip->tcpc_dev.fwnode); 1782 destroy_workqueue(chip->wq); 1783 fusb302_debugfs_exit(chip); 1784 1785 return 0; 1786 } 1787 1788 static int fusb302_pm_suspend(struct device *dev) 1789 { 1790 struct fusb302_chip *chip = dev->driver_data; 1791 unsigned long flags; 1792 1793 spin_lock_irqsave(&chip->irq_lock, flags); 1794 chip->irq_suspended = true; 1795 spin_unlock_irqrestore(&chip->irq_lock, flags); 1796 1797 /* Make sure any pending irq_work is finished before the bus suspends */ 1798 flush_work(&chip->irq_work); 1799 return 0; 1800 } 1801 1802 static int fusb302_pm_resume(struct device *dev) 1803 { 1804 struct fusb302_chip *chip = dev->driver_data; 1805 unsigned long flags; 1806 1807 spin_lock_irqsave(&chip->irq_lock, flags); 1808 if (chip->irq_while_suspended) { 1809 schedule_work(&chip->irq_work); 1810 chip->irq_while_suspended = false; 1811 } 1812 chip->irq_suspended = false; 1813 spin_unlock_irqrestore(&chip->irq_lock, flags); 1814 1815 return 0; 1816 } 1817 1818 static const struct of_device_id fusb302_dt_match[] = { 1819 {.compatible = "fcs,fusb302"}, 1820 {}, 1821 }; 1822 MODULE_DEVICE_TABLE(of, fusb302_dt_match); 1823 1824 static const struct i2c_device_id fusb302_i2c_device_id[] = { 1825 {"typec_fusb302", 0}, 1826 {}, 1827 }; 1828 MODULE_DEVICE_TABLE(i2c, fusb302_i2c_device_id); 1829 1830 static const struct dev_pm_ops fusb302_pm_ops = { 1831 .suspend = fusb302_pm_suspend, 1832 .resume = fusb302_pm_resume, 1833 }; 1834 1835 static struct i2c_driver fusb302_driver = { 1836 .driver = { 1837 .name = "typec_fusb302", 1838 .pm = &fusb302_pm_ops, 1839 .of_match_table = of_match_ptr(fusb302_dt_match), 1840 }, 1841 .probe = fusb302_probe, 1842 .remove = fusb302_remove, 1843 .id_table = fusb302_i2c_device_id, 1844 }; 1845 module_i2c_driver(fusb302_driver); 1846 1847 MODULE_AUTHOR("Yueyao Zhu <yueyao.zhu@gmail.com>"); 1848 MODULE_DESCRIPTION("Fairchild FUSB302 Type-C Chip Driver"); 1849 MODULE_LICENSE("GPL"); 1850