1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/acpi.h> 3 #include <linux/ctype.h> 4 #include <linux/debugfs.h> 5 #include <linux/delay.h> 6 #include <linux/gpio/consumer.h> 7 #include <linux/hwmon.h> 8 #include <linux/i2c.h> 9 #include <linux/interrupt.h> 10 #include <linux/jiffies.h> 11 #include <linux/mdio/mdio-i2c.h> 12 #include <linux/module.h> 13 #include <linux/mutex.h> 14 #include <linux/of.h> 15 #include <linux/phy.h> 16 #include <linux/platform_device.h> 17 #include <linux/rtnetlink.h> 18 #include <linux/slab.h> 19 #include <linux/workqueue.h> 20 21 #include "sfp.h" 22 #include "swphy.h" 23 24 enum { 25 GPIO_MODDEF0, 26 GPIO_LOS, 27 GPIO_TX_FAULT, 28 GPIO_TX_DISABLE, 29 GPIO_RATE_SELECT, 30 GPIO_MAX, 31 32 SFP_F_PRESENT = BIT(GPIO_MODDEF0), 33 SFP_F_LOS = BIT(GPIO_LOS), 34 SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT), 35 SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE), 36 SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT), 37 38 SFP_E_INSERT = 0, 39 SFP_E_REMOVE, 40 SFP_E_DEV_ATTACH, 41 SFP_E_DEV_DETACH, 42 SFP_E_DEV_DOWN, 43 SFP_E_DEV_UP, 44 SFP_E_TX_FAULT, 45 SFP_E_TX_CLEAR, 46 SFP_E_LOS_HIGH, 47 SFP_E_LOS_LOW, 48 SFP_E_TIMEOUT, 49 50 SFP_MOD_EMPTY = 0, 51 SFP_MOD_ERROR, 52 SFP_MOD_PROBE, 53 SFP_MOD_WAITDEV, 54 SFP_MOD_HPOWER, 55 SFP_MOD_WAITPWR, 56 SFP_MOD_PRESENT, 57 58 SFP_DEV_DETACHED = 0, 59 SFP_DEV_DOWN, 60 SFP_DEV_UP, 61 62 SFP_S_DOWN = 0, 63 SFP_S_FAIL, 64 SFP_S_WAIT, 65 SFP_S_INIT, 66 SFP_S_INIT_PHY, 67 SFP_S_INIT_TX_FAULT, 68 SFP_S_WAIT_LOS, 69 SFP_S_LINK_UP, 70 SFP_S_TX_FAULT, 71 SFP_S_REINIT, 72 SFP_S_TX_DISABLE, 73 }; 74 75 static const char * const mod_state_strings[] = { 76 [SFP_MOD_EMPTY] = "empty", 77 [SFP_MOD_ERROR] = "error", 78 [SFP_MOD_PROBE] = "probe", 79 [SFP_MOD_WAITDEV] = "waitdev", 80 [SFP_MOD_HPOWER] = "hpower", 81 [SFP_MOD_WAITPWR] = "waitpwr", 82 [SFP_MOD_PRESENT] = "present", 83 }; 84 85 static const char *mod_state_to_str(unsigned short mod_state) 86 { 87 if (mod_state >= ARRAY_SIZE(mod_state_strings)) 88 return "Unknown module state"; 89 return mod_state_strings[mod_state]; 90 } 91 92 static const char * const dev_state_strings[] = { 93 [SFP_DEV_DETACHED] = "detached", 94 [SFP_DEV_DOWN] = "down", 95 [SFP_DEV_UP] = "up", 96 }; 97 98 static const char *dev_state_to_str(unsigned short dev_state) 99 { 100 if (dev_state >= ARRAY_SIZE(dev_state_strings)) 101 return "Unknown device state"; 102 return dev_state_strings[dev_state]; 103 } 104 105 static const char * const event_strings[] = { 106 [SFP_E_INSERT] = "insert", 107 [SFP_E_REMOVE] = "remove", 108 [SFP_E_DEV_ATTACH] = "dev_attach", 109 [SFP_E_DEV_DETACH] = "dev_detach", 110 [SFP_E_DEV_DOWN] = "dev_down", 111 [SFP_E_DEV_UP] = "dev_up", 112 [SFP_E_TX_FAULT] = "tx_fault", 113 [SFP_E_TX_CLEAR] = "tx_clear", 114 [SFP_E_LOS_HIGH] = "los_high", 115 [SFP_E_LOS_LOW] = "los_low", 116 [SFP_E_TIMEOUT] = "timeout", 117 }; 118 119 static const char *event_to_str(unsigned short event) 120 { 121 if (event >= ARRAY_SIZE(event_strings)) 122 return "Unknown event"; 123 return event_strings[event]; 124 } 125 126 static const char * const sm_state_strings[] = { 127 [SFP_S_DOWN] = "down", 128 [SFP_S_FAIL] = "fail", 129 [SFP_S_WAIT] = "wait", 130 [SFP_S_INIT] = "init", 131 [SFP_S_INIT_PHY] = "init_phy", 132 [SFP_S_INIT_TX_FAULT] = "init_tx_fault", 133 [SFP_S_WAIT_LOS] = "wait_los", 134 [SFP_S_LINK_UP] = "link_up", 135 [SFP_S_TX_FAULT] = "tx_fault", 136 [SFP_S_REINIT] = "reinit", 137 [SFP_S_TX_DISABLE] = "rx_disable", 138 }; 139 140 static const char *sm_state_to_str(unsigned short sm_state) 141 { 142 if (sm_state >= ARRAY_SIZE(sm_state_strings)) 143 return "Unknown state"; 144 return sm_state_strings[sm_state]; 145 } 146 147 static const char *gpio_of_names[] = { 148 "mod-def0", 149 "los", 150 "tx-fault", 151 "tx-disable", 152 "rate-select0", 153 }; 154 155 static const enum gpiod_flags gpio_flags[] = { 156 GPIOD_IN, 157 GPIOD_IN, 158 GPIOD_IN, 159 GPIOD_ASIS, 160 GPIOD_ASIS, 161 }; 162 163 /* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a 164 * non-cooled module to initialise its laser safety circuitry. We wait 165 * an initial T_WAIT period before we check the tx fault to give any PHY 166 * on board (for a copper SFP) time to initialise. 167 */ 168 #define T_WAIT msecs_to_jiffies(50) 169 #define T_START_UP msecs_to_jiffies(300) 170 #define T_START_UP_BAD_GPON msecs_to_jiffies(60000) 171 172 /* t_reset is the time required to assert the TX_DISABLE signal to reset 173 * an indicated TX_FAULT. 174 */ 175 #define T_RESET_US 10 176 #define T_FAULT_RECOVER msecs_to_jiffies(1000) 177 178 /* N_FAULT_INIT is the number of recovery attempts at module initialisation 179 * time. If the TX_FAULT signal is not deasserted after this number of 180 * attempts at clearing it, we decide that the module is faulty. 181 * N_FAULT is the same but after the module has initialised. 182 */ 183 #define N_FAULT_INIT 5 184 #define N_FAULT 5 185 186 /* T_PHY_RETRY is the time interval between attempts to probe the PHY. 187 * R_PHY_RETRY is the number of attempts. 188 */ 189 #define T_PHY_RETRY msecs_to_jiffies(50) 190 #define R_PHY_RETRY 12 191 192 /* SFP module presence detection is poor: the three MOD DEF signals are 193 * the same length on the PCB, which means it's possible for MOD DEF 0 to 194 * connect before the I2C bus on MOD DEF 1/2. 195 * 196 * The SFF-8472 specifies t_serial ("Time from power on until module is 197 * ready for data transmission over the two wire serial bus.") as 300ms. 198 */ 199 #define T_SERIAL msecs_to_jiffies(300) 200 #define T_HPOWER_LEVEL msecs_to_jiffies(300) 201 #define T_PROBE_RETRY_INIT msecs_to_jiffies(100) 202 #define R_PROBE_RETRY_INIT 10 203 #define T_PROBE_RETRY_SLOW msecs_to_jiffies(5000) 204 #define R_PROBE_RETRY_SLOW 12 205 206 /* SFP modules appear to always have their PHY configured for bus address 207 * 0x56 (which with mdio-i2c, translates to a PHY address of 22). 208 */ 209 #define SFP_PHY_ADDR 22 210 211 struct sff_data { 212 unsigned int gpios; 213 bool (*module_supported)(const struct sfp_eeprom_id *id); 214 }; 215 216 struct sfp { 217 struct device *dev; 218 struct i2c_adapter *i2c; 219 struct mii_bus *i2c_mii; 220 struct sfp_bus *sfp_bus; 221 struct phy_device *mod_phy; 222 const struct sff_data *type; 223 size_t i2c_block_size; 224 u32 max_power_mW; 225 226 unsigned int (*get_state)(struct sfp *); 227 void (*set_state)(struct sfp *, unsigned int); 228 int (*read)(struct sfp *, bool, u8, void *, size_t); 229 int (*write)(struct sfp *, bool, u8, void *, size_t); 230 231 struct gpio_desc *gpio[GPIO_MAX]; 232 int gpio_irq[GPIO_MAX]; 233 234 bool need_poll; 235 236 struct mutex st_mutex; /* Protects state */ 237 unsigned int state_soft_mask; 238 unsigned int state; 239 struct delayed_work poll; 240 struct delayed_work timeout; 241 struct mutex sm_mutex; /* Protects state machine */ 242 unsigned char sm_mod_state; 243 unsigned char sm_mod_tries_init; 244 unsigned char sm_mod_tries; 245 unsigned char sm_dev_state; 246 unsigned short sm_state; 247 unsigned char sm_fault_retries; 248 unsigned char sm_phy_retries; 249 250 struct sfp_eeprom_id id; 251 unsigned int module_power_mW; 252 unsigned int module_t_start_up; 253 254 #if IS_ENABLED(CONFIG_HWMON) 255 struct sfp_diag diag; 256 struct delayed_work hwmon_probe; 257 unsigned int hwmon_tries; 258 struct device *hwmon_dev; 259 char *hwmon_name; 260 #endif 261 262 #if IS_ENABLED(CONFIG_DEBUG_FS) 263 struct dentry *debugfs_dir; 264 #endif 265 }; 266 267 static bool sff_module_supported(const struct sfp_eeprom_id *id) 268 { 269 return id->base.phys_id == SFF8024_ID_SFF_8472 && 270 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP; 271 } 272 273 static const struct sff_data sff_data = { 274 .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE, 275 .module_supported = sff_module_supported, 276 }; 277 278 static bool sfp_module_supported(const struct sfp_eeprom_id *id) 279 { 280 return id->base.phys_id == SFF8024_ID_SFP && 281 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP; 282 } 283 284 static const struct sff_data sfp_data = { 285 .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT | 286 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT, 287 .module_supported = sfp_module_supported, 288 }; 289 290 static const struct of_device_id sfp_of_match[] = { 291 { .compatible = "sff,sff", .data = &sff_data, }, 292 { .compatible = "sff,sfp", .data = &sfp_data, }, 293 { }, 294 }; 295 MODULE_DEVICE_TABLE(of, sfp_of_match); 296 297 static unsigned long poll_jiffies; 298 299 static unsigned int sfp_gpio_get_state(struct sfp *sfp) 300 { 301 unsigned int i, state, v; 302 303 for (i = state = 0; i < GPIO_MAX; i++) { 304 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i]) 305 continue; 306 307 v = gpiod_get_value_cansleep(sfp->gpio[i]); 308 if (v) 309 state |= BIT(i); 310 } 311 312 return state; 313 } 314 315 static unsigned int sff_gpio_get_state(struct sfp *sfp) 316 { 317 return sfp_gpio_get_state(sfp) | SFP_F_PRESENT; 318 } 319 320 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state) 321 { 322 if (state & SFP_F_PRESENT) { 323 /* If the module is present, drive the signals */ 324 if (sfp->gpio[GPIO_TX_DISABLE]) 325 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE], 326 state & SFP_F_TX_DISABLE); 327 if (state & SFP_F_RATE_SELECT) 328 gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT], 329 state & SFP_F_RATE_SELECT); 330 } else { 331 /* Otherwise, let them float to the pull-ups */ 332 if (sfp->gpio[GPIO_TX_DISABLE]) 333 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]); 334 if (state & SFP_F_RATE_SELECT) 335 gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]); 336 } 337 } 338 339 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf, 340 size_t len) 341 { 342 struct i2c_msg msgs[2]; 343 u8 bus_addr = a2 ? 0x51 : 0x50; 344 size_t block_size = sfp->i2c_block_size; 345 size_t this_len; 346 int ret; 347 348 msgs[0].addr = bus_addr; 349 msgs[0].flags = 0; 350 msgs[0].len = 1; 351 msgs[0].buf = &dev_addr; 352 msgs[1].addr = bus_addr; 353 msgs[1].flags = I2C_M_RD; 354 msgs[1].len = len; 355 msgs[1].buf = buf; 356 357 while (len) { 358 this_len = len; 359 if (this_len > block_size) 360 this_len = block_size; 361 362 msgs[1].len = this_len; 363 364 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs)); 365 if (ret < 0) 366 return ret; 367 368 if (ret != ARRAY_SIZE(msgs)) 369 break; 370 371 msgs[1].buf += this_len; 372 dev_addr += this_len; 373 len -= this_len; 374 } 375 376 return msgs[1].buf - (u8 *)buf; 377 } 378 379 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf, 380 size_t len) 381 { 382 struct i2c_msg msgs[1]; 383 u8 bus_addr = a2 ? 0x51 : 0x50; 384 int ret; 385 386 msgs[0].addr = bus_addr; 387 msgs[0].flags = 0; 388 msgs[0].len = 1 + len; 389 msgs[0].buf = kmalloc(1 + len, GFP_KERNEL); 390 if (!msgs[0].buf) 391 return -ENOMEM; 392 393 msgs[0].buf[0] = dev_addr; 394 memcpy(&msgs[0].buf[1], buf, len); 395 396 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs)); 397 398 kfree(msgs[0].buf); 399 400 if (ret < 0) 401 return ret; 402 403 return ret == ARRAY_SIZE(msgs) ? len : 0; 404 } 405 406 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c) 407 { 408 struct mii_bus *i2c_mii; 409 int ret; 410 411 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C)) 412 return -EINVAL; 413 414 sfp->i2c = i2c; 415 sfp->read = sfp_i2c_read; 416 sfp->write = sfp_i2c_write; 417 418 i2c_mii = mdio_i2c_alloc(sfp->dev, i2c); 419 if (IS_ERR(i2c_mii)) 420 return PTR_ERR(i2c_mii); 421 422 i2c_mii->name = "SFP I2C Bus"; 423 i2c_mii->phy_mask = ~0; 424 425 ret = mdiobus_register(i2c_mii); 426 if (ret < 0) { 427 mdiobus_free(i2c_mii); 428 return ret; 429 } 430 431 sfp->i2c_mii = i2c_mii; 432 433 return 0; 434 } 435 436 /* Interface */ 437 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len) 438 { 439 return sfp->read(sfp, a2, addr, buf, len); 440 } 441 442 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len) 443 { 444 return sfp->write(sfp, a2, addr, buf, len); 445 } 446 447 static unsigned int sfp_soft_get_state(struct sfp *sfp) 448 { 449 unsigned int state = 0; 450 u8 status; 451 int ret; 452 453 ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)); 454 if (ret == sizeof(status)) { 455 if (status & SFP_STATUS_RX_LOS) 456 state |= SFP_F_LOS; 457 if (status & SFP_STATUS_TX_FAULT) 458 state |= SFP_F_TX_FAULT; 459 } else { 460 dev_err_ratelimited(sfp->dev, 461 "failed to read SFP soft status: %d\n", 462 ret); 463 /* Preserve the current state */ 464 state = sfp->state; 465 } 466 467 return state & sfp->state_soft_mask; 468 } 469 470 static void sfp_soft_set_state(struct sfp *sfp, unsigned int state) 471 { 472 u8 status; 473 474 if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) == 475 sizeof(status)) { 476 if (state & SFP_F_TX_DISABLE) 477 status |= SFP_STATUS_TX_DISABLE_FORCE; 478 else 479 status &= ~SFP_STATUS_TX_DISABLE_FORCE; 480 481 sfp_write(sfp, true, SFP_STATUS, &status, sizeof(status)); 482 } 483 } 484 485 static void sfp_soft_start_poll(struct sfp *sfp) 486 { 487 const struct sfp_eeprom_id *id = &sfp->id; 488 489 sfp->state_soft_mask = 0; 490 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE && 491 !sfp->gpio[GPIO_TX_DISABLE]) 492 sfp->state_soft_mask |= SFP_F_TX_DISABLE; 493 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT && 494 !sfp->gpio[GPIO_TX_FAULT]) 495 sfp->state_soft_mask |= SFP_F_TX_FAULT; 496 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS && 497 !sfp->gpio[GPIO_LOS]) 498 sfp->state_soft_mask |= SFP_F_LOS; 499 500 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) && 501 !sfp->need_poll) 502 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 503 } 504 505 static void sfp_soft_stop_poll(struct sfp *sfp) 506 { 507 sfp->state_soft_mask = 0; 508 } 509 510 static unsigned int sfp_get_state(struct sfp *sfp) 511 { 512 unsigned int state = sfp->get_state(sfp); 513 514 if (state & SFP_F_PRESENT && 515 sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT)) 516 state |= sfp_soft_get_state(sfp); 517 518 return state; 519 } 520 521 static void sfp_set_state(struct sfp *sfp, unsigned int state) 522 { 523 sfp->set_state(sfp, state); 524 525 if (state & SFP_F_PRESENT && 526 sfp->state_soft_mask & SFP_F_TX_DISABLE) 527 sfp_soft_set_state(sfp, state); 528 } 529 530 static unsigned int sfp_check(void *buf, size_t len) 531 { 532 u8 *p, check; 533 534 for (p = buf, check = 0; len; p++, len--) 535 check += *p; 536 537 return check; 538 } 539 540 /* hwmon */ 541 #if IS_ENABLED(CONFIG_HWMON) 542 static umode_t sfp_hwmon_is_visible(const void *data, 543 enum hwmon_sensor_types type, 544 u32 attr, int channel) 545 { 546 const struct sfp *sfp = data; 547 548 switch (type) { 549 case hwmon_temp: 550 switch (attr) { 551 case hwmon_temp_min_alarm: 552 case hwmon_temp_max_alarm: 553 case hwmon_temp_lcrit_alarm: 554 case hwmon_temp_crit_alarm: 555 case hwmon_temp_min: 556 case hwmon_temp_max: 557 case hwmon_temp_lcrit: 558 case hwmon_temp_crit: 559 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 560 return 0; 561 fallthrough; 562 case hwmon_temp_input: 563 case hwmon_temp_label: 564 return 0444; 565 default: 566 return 0; 567 } 568 case hwmon_in: 569 switch (attr) { 570 case hwmon_in_min_alarm: 571 case hwmon_in_max_alarm: 572 case hwmon_in_lcrit_alarm: 573 case hwmon_in_crit_alarm: 574 case hwmon_in_min: 575 case hwmon_in_max: 576 case hwmon_in_lcrit: 577 case hwmon_in_crit: 578 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 579 return 0; 580 fallthrough; 581 case hwmon_in_input: 582 case hwmon_in_label: 583 return 0444; 584 default: 585 return 0; 586 } 587 case hwmon_curr: 588 switch (attr) { 589 case hwmon_curr_min_alarm: 590 case hwmon_curr_max_alarm: 591 case hwmon_curr_lcrit_alarm: 592 case hwmon_curr_crit_alarm: 593 case hwmon_curr_min: 594 case hwmon_curr_max: 595 case hwmon_curr_lcrit: 596 case hwmon_curr_crit: 597 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 598 return 0; 599 fallthrough; 600 case hwmon_curr_input: 601 case hwmon_curr_label: 602 return 0444; 603 default: 604 return 0; 605 } 606 case hwmon_power: 607 /* External calibration of receive power requires 608 * floating point arithmetic. Doing that in the kernel 609 * is not easy, so just skip it. If the module does 610 * not require external calibration, we can however 611 * show receiver power, since FP is then not needed. 612 */ 613 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL && 614 channel == 1) 615 return 0; 616 switch (attr) { 617 case hwmon_power_min_alarm: 618 case hwmon_power_max_alarm: 619 case hwmon_power_lcrit_alarm: 620 case hwmon_power_crit_alarm: 621 case hwmon_power_min: 622 case hwmon_power_max: 623 case hwmon_power_lcrit: 624 case hwmon_power_crit: 625 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 626 return 0; 627 fallthrough; 628 case hwmon_power_input: 629 case hwmon_power_label: 630 return 0444; 631 default: 632 return 0; 633 } 634 default: 635 return 0; 636 } 637 } 638 639 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value) 640 { 641 __be16 val; 642 int err; 643 644 err = sfp_read(sfp, true, reg, &val, sizeof(val)); 645 if (err < 0) 646 return err; 647 648 *value = be16_to_cpu(val); 649 650 return 0; 651 } 652 653 static void sfp_hwmon_to_rx_power(long *value) 654 { 655 *value = DIV_ROUND_CLOSEST(*value, 10); 656 } 657 658 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset, 659 long *value) 660 { 661 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL) 662 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset; 663 } 664 665 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value) 666 { 667 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope), 668 be16_to_cpu(sfp->diag.cal_t_offset), value); 669 670 if (*value >= 0x8000) 671 *value -= 0x10000; 672 673 *value = DIV_ROUND_CLOSEST(*value * 1000, 256); 674 } 675 676 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value) 677 { 678 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope), 679 be16_to_cpu(sfp->diag.cal_v_offset), value); 680 681 *value = DIV_ROUND_CLOSEST(*value, 10); 682 } 683 684 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value) 685 { 686 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope), 687 be16_to_cpu(sfp->diag.cal_txi_offset), value); 688 689 *value = DIV_ROUND_CLOSEST(*value, 500); 690 } 691 692 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value) 693 { 694 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope), 695 be16_to_cpu(sfp->diag.cal_txpwr_offset), value); 696 697 *value = DIV_ROUND_CLOSEST(*value, 10); 698 } 699 700 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value) 701 { 702 int err; 703 704 err = sfp_hwmon_read_sensor(sfp, reg, value); 705 if (err < 0) 706 return err; 707 708 sfp_hwmon_calibrate_temp(sfp, value); 709 710 return 0; 711 } 712 713 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value) 714 { 715 int err; 716 717 err = sfp_hwmon_read_sensor(sfp, reg, value); 718 if (err < 0) 719 return err; 720 721 sfp_hwmon_calibrate_vcc(sfp, value); 722 723 return 0; 724 } 725 726 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value) 727 { 728 int err; 729 730 err = sfp_hwmon_read_sensor(sfp, reg, value); 731 if (err < 0) 732 return err; 733 734 sfp_hwmon_calibrate_bias(sfp, value); 735 736 return 0; 737 } 738 739 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value) 740 { 741 int err; 742 743 err = sfp_hwmon_read_sensor(sfp, reg, value); 744 if (err < 0) 745 return err; 746 747 sfp_hwmon_calibrate_tx_power(sfp, value); 748 749 return 0; 750 } 751 752 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value) 753 { 754 int err; 755 756 err = sfp_hwmon_read_sensor(sfp, reg, value); 757 if (err < 0) 758 return err; 759 760 sfp_hwmon_to_rx_power(value); 761 762 return 0; 763 } 764 765 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value) 766 { 767 u8 status; 768 int err; 769 770 switch (attr) { 771 case hwmon_temp_input: 772 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value); 773 774 case hwmon_temp_lcrit: 775 *value = be16_to_cpu(sfp->diag.temp_low_alarm); 776 sfp_hwmon_calibrate_temp(sfp, value); 777 return 0; 778 779 case hwmon_temp_min: 780 *value = be16_to_cpu(sfp->diag.temp_low_warn); 781 sfp_hwmon_calibrate_temp(sfp, value); 782 return 0; 783 case hwmon_temp_max: 784 *value = be16_to_cpu(sfp->diag.temp_high_warn); 785 sfp_hwmon_calibrate_temp(sfp, value); 786 return 0; 787 788 case hwmon_temp_crit: 789 *value = be16_to_cpu(sfp->diag.temp_high_alarm); 790 sfp_hwmon_calibrate_temp(sfp, value); 791 return 0; 792 793 case hwmon_temp_lcrit_alarm: 794 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 795 if (err < 0) 796 return err; 797 798 *value = !!(status & SFP_ALARM0_TEMP_LOW); 799 return 0; 800 801 case hwmon_temp_min_alarm: 802 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 803 if (err < 0) 804 return err; 805 806 *value = !!(status & SFP_WARN0_TEMP_LOW); 807 return 0; 808 809 case hwmon_temp_max_alarm: 810 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 811 if (err < 0) 812 return err; 813 814 *value = !!(status & SFP_WARN0_TEMP_HIGH); 815 return 0; 816 817 case hwmon_temp_crit_alarm: 818 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 819 if (err < 0) 820 return err; 821 822 *value = !!(status & SFP_ALARM0_TEMP_HIGH); 823 return 0; 824 default: 825 return -EOPNOTSUPP; 826 } 827 828 return -EOPNOTSUPP; 829 } 830 831 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value) 832 { 833 u8 status; 834 int err; 835 836 switch (attr) { 837 case hwmon_in_input: 838 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value); 839 840 case hwmon_in_lcrit: 841 *value = be16_to_cpu(sfp->diag.volt_low_alarm); 842 sfp_hwmon_calibrate_vcc(sfp, value); 843 return 0; 844 845 case hwmon_in_min: 846 *value = be16_to_cpu(sfp->diag.volt_low_warn); 847 sfp_hwmon_calibrate_vcc(sfp, value); 848 return 0; 849 850 case hwmon_in_max: 851 *value = be16_to_cpu(sfp->diag.volt_high_warn); 852 sfp_hwmon_calibrate_vcc(sfp, value); 853 return 0; 854 855 case hwmon_in_crit: 856 *value = be16_to_cpu(sfp->diag.volt_high_alarm); 857 sfp_hwmon_calibrate_vcc(sfp, value); 858 return 0; 859 860 case hwmon_in_lcrit_alarm: 861 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 862 if (err < 0) 863 return err; 864 865 *value = !!(status & SFP_ALARM0_VCC_LOW); 866 return 0; 867 868 case hwmon_in_min_alarm: 869 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 870 if (err < 0) 871 return err; 872 873 *value = !!(status & SFP_WARN0_VCC_LOW); 874 return 0; 875 876 case hwmon_in_max_alarm: 877 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 878 if (err < 0) 879 return err; 880 881 *value = !!(status & SFP_WARN0_VCC_HIGH); 882 return 0; 883 884 case hwmon_in_crit_alarm: 885 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 886 if (err < 0) 887 return err; 888 889 *value = !!(status & SFP_ALARM0_VCC_HIGH); 890 return 0; 891 default: 892 return -EOPNOTSUPP; 893 } 894 895 return -EOPNOTSUPP; 896 } 897 898 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value) 899 { 900 u8 status; 901 int err; 902 903 switch (attr) { 904 case hwmon_curr_input: 905 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value); 906 907 case hwmon_curr_lcrit: 908 *value = be16_to_cpu(sfp->diag.bias_low_alarm); 909 sfp_hwmon_calibrate_bias(sfp, value); 910 return 0; 911 912 case hwmon_curr_min: 913 *value = be16_to_cpu(sfp->diag.bias_low_warn); 914 sfp_hwmon_calibrate_bias(sfp, value); 915 return 0; 916 917 case hwmon_curr_max: 918 *value = be16_to_cpu(sfp->diag.bias_high_warn); 919 sfp_hwmon_calibrate_bias(sfp, value); 920 return 0; 921 922 case hwmon_curr_crit: 923 *value = be16_to_cpu(sfp->diag.bias_high_alarm); 924 sfp_hwmon_calibrate_bias(sfp, value); 925 return 0; 926 927 case hwmon_curr_lcrit_alarm: 928 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 929 if (err < 0) 930 return err; 931 932 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW); 933 return 0; 934 935 case hwmon_curr_min_alarm: 936 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 937 if (err < 0) 938 return err; 939 940 *value = !!(status & SFP_WARN0_TX_BIAS_LOW); 941 return 0; 942 943 case hwmon_curr_max_alarm: 944 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 945 if (err < 0) 946 return err; 947 948 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH); 949 return 0; 950 951 case hwmon_curr_crit_alarm: 952 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 953 if (err < 0) 954 return err; 955 956 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH); 957 return 0; 958 default: 959 return -EOPNOTSUPP; 960 } 961 962 return -EOPNOTSUPP; 963 } 964 965 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value) 966 { 967 u8 status; 968 int err; 969 970 switch (attr) { 971 case hwmon_power_input: 972 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value); 973 974 case hwmon_power_lcrit: 975 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm); 976 sfp_hwmon_calibrate_tx_power(sfp, value); 977 return 0; 978 979 case hwmon_power_min: 980 *value = be16_to_cpu(sfp->diag.txpwr_low_warn); 981 sfp_hwmon_calibrate_tx_power(sfp, value); 982 return 0; 983 984 case hwmon_power_max: 985 *value = be16_to_cpu(sfp->diag.txpwr_high_warn); 986 sfp_hwmon_calibrate_tx_power(sfp, value); 987 return 0; 988 989 case hwmon_power_crit: 990 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm); 991 sfp_hwmon_calibrate_tx_power(sfp, value); 992 return 0; 993 994 case hwmon_power_lcrit_alarm: 995 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 996 if (err < 0) 997 return err; 998 999 *value = !!(status & SFP_ALARM0_TXPWR_LOW); 1000 return 0; 1001 1002 case hwmon_power_min_alarm: 1003 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1004 if (err < 0) 1005 return err; 1006 1007 *value = !!(status & SFP_WARN0_TXPWR_LOW); 1008 return 0; 1009 1010 case hwmon_power_max_alarm: 1011 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1012 if (err < 0) 1013 return err; 1014 1015 *value = !!(status & SFP_WARN0_TXPWR_HIGH); 1016 return 0; 1017 1018 case hwmon_power_crit_alarm: 1019 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1020 if (err < 0) 1021 return err; 1022 1023 *value = !!(status & SFP_ALARM0_TXPWR_HIGH); 1024 return 0; 1025 default: 1026 return -EOPNOTSUPP; 1027 } 1028 1029 return -EOPNOTSUPP; 1030 } 1031 1032 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value) 1033 { 1034 u8 status; 1035 int err; 1036 1037 switch (attr) { 1038 case hwmon_power_input: 1039 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value); 1040 1041 case hwmon_power_lcrit: 1042 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm); 1043 sfp_hwmon_to_rx_power(value); 1044 return 0; 1045 1046 case hwmon_power_min: 1047 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn); 1048 sfp_hwmon_to_rx_power(value); 1049 return 0; 1050 1051 case hwmon_power_max: 1052 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn); 1053 sfp_hwmon_to_rx_power(value); 1054 return 0; 1055 1056 case hwmon_power_crit: 1057 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm); 1058 sfp_hwmon_to_rx_power(value); 1059 return 0; 1060 1061 case hwmon_power_lcrit_alarm: 1062 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status)); 1063 if (err < 0) 1064 return err; 1065 1066 *value = !!(status & SFP_ALARM1_RXPWR_LOW); 1067 return 0; 1068 1069 case hwmon_power_min_alarm: 1070 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status)); 1071 if (err < 0) 1072 return err; 1073 1074 *value = !!(status & SFP_WARN1_RXPWR_LOW); 1075 return 0; 1076 1077 case hwmon_power_max_alarm: 1078 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status)); 1079 if (err < 0) 1080 return err; 1081 1082 *value = !!(status & SFP_WARN1_RXPWR_HIGH); 1083 return 0; 1084 1085 case hwmon_power_crit_alarm: 1086 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status)); 1087 if (err < 0) 1088 return err; 1089 1090 *value = !!(status & SFP_ALARM1_RXPWR_HIGH); 1091 return 0; 1092 default: 1093 return -EOPNOTSUPP; 1094 } 1095 1096 return -EOPNOTSUPP; 1097 } 1098 1099 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type, 1100 u32 attr, int channel, long *value) 1101 { 1102 struct sfp *sfp = dev_get_drvdata(dev); 1103 1104 switch (type) { 1105 case hwmon_temp: 1106 return sfp_hwmon_temp(sfp, attr, value); 1107 case hwmon_in: 1108 return sfp_hwmon_vcc(sfp, attr, value); 1109 case hwmon_curr: 1110 return sfp_hwmon_bias(sfp, attr, value); 1111 case hwmon_power: 1112 switch (channel) { 1113 case 0: 1114 return sfp_hwmon_tx_power(sfp, attr, value); 1115 case 1: 1116 return sfp_hwmon_rx_power(sfp, attr, value); 1117 default: 1118 return -EOPNOTSUPP; 1119 } 1120 default: 1121 return -EOPNOTSUPP; 1122 } 1123 } 1124 1125 static const char *const sfp_hwmon_power_labels[] = { 1126 "TX_power", 1127 "RX_power", 1128 }; 1129 1130 static int sfp_hwmon_read_string(struct device *dev, 1131 enum hwmon_sensor_types type, 1132 u32 attr, int channel, const char **str) 1133 { 1134 switch (type) { 1135 case hwmon_curr: 1136 switch (attr) { 1137 case hwmon_curr_label: 1138 *str = "bias"; 1139 return 0; 1140 default: 1141 return -EOPNOTSUPP; 1142 } 1143 break; 1144 case hwmon_temp: 1145 switch (attr) { 1146 case hwmon_temp_label: 1147 *str = "temperature"; 1148 return 0; 1149 default: 1150 return -EOPNOTSUPP; 1151 } 1152 break; 1153 case hwmon_in: 1154 switch (attr) { 1155 case hwmon_in_label: 1156 *str = "VCC"; 1157 return 0; 1158 default: 1159 return -EOPNOTSUPP; 1160 } 1161 break; 1162 case hwmon_power: 1163 switch (attr) { 1164 case hwmon_power_label: 1165 *str = sfp_hwmon_power_labels[channel]; 1166 return 0; 1167 default: 1168 return -EOPNOTSUPP; 1169 } 1170 break; 1171 default: 1172 return -EOPNOTSUPP; 1173 } 1174 1175 return -EOPNOTSUPP; 1176 } 1177 1178 static const struct hwmon_ops sfp_hwmon_ops = { 1179 .is_visible = sfp_hwmon_is_visible, 1180 .read = sfp_hwmon_read, 1181 .read_string = sfp_hwmon_read_string, 1182 }; 1183 1184 static u32 sfp_hwmon_chip_config[] = { 1185 HWMON_C_REGISTER_TZ, 1186 0, 1187 }; 1188 1189 static const struct hwmon_channel_info sfp_hwmon_chip = { 1190 .type = hwmon_chip, 1191 .config = sfp_hwmon_chip_config, 1192 }; 1193 1194 static u32 sfp_hwmon_temp_config[] = { 1195 HWMON_T_INPUT | 1196 HWMON_T_MAX | HWMON_T_MIN | 1197 HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM | 1198 HWMON_T_CRIT | HWMON_T_LCRIT | 1199 HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM | 1200 HWMON_T_LABEL, 1201 0, 1202 }; 1203 1204 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = { 1205 .type = hwmon_temp, 1206 .config = sfp_hwmon_temp_config, 1207 }; 1208 1209 static u32 sfp_hwmon_vcc_config[] = { 1210 HWMON_I_INPUT | 1211 HWMON_I_MAX | HWMON_I_MIN | 1212 HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM | 1213 HWMON_I_CRIT | HWMON_I_LCRIT | 1214 HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM | 1215 HWMON_I_LABEL, 1216 0, 1217 }; 1218 1219 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = { 1220 .type = hwmon_in, 1221 .config = sfp_hwmon_vcc_config, 1222 }; 1223 1224 static u32 sfp_hwmon_bias_config[] = { 1225 HWMON_C_INPUT | 1226 HWMON_C_MAX | HWMON_C_MIN | 1227 HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM | 1228 HWMON_C_CRIT | HWMON_C_LCRIT | 1229 HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM | 1230 HWMON_C_LABEL, 1231 0, 1232 }; 1233 1234 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = { 1235 .type = hwmon_curr, 1236 .config = sfp_hwmon_bias_config, 1237 }; 1238 1239 static u32 sfp_hwmon_power_config[] = { 1240 /* Transmit power */ 1241 HWMON_P_INPUT | 1242 HWMON_P_MAX | HWMON_P_MIN | 1243 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM | 1244 HWMON_P_CRIT | HWMON_P_LCRIT | 1245 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM | 1246 HWMON_P_LABEL, 1247 /* Receive power */ 1248 HWMON_P_INPUT | 1249 HWMON_P_MAX | HWMON_P_MIN | 1250 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM | 1251 HWMON_P_CRIT | HWMON_P_LCRIT | 1252 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM | 1253 HWMON_P_LABEL, 1254 0, 1255 }; 1256 1257 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = { 1258 .type = hwmon_power, 1259 .config = sfp_hwmon_power_config, 1260 }; 1261 1262 static const struct hwmon_channel_info *sfp_hwmon_info[] = { 1263 &sfp_hwmon_chip, 1264 &sfp_hwmon_vcc_channel_info, 1265 &sfp_hwmon_temp_channel_info, 1266 &sfp_hwmon_bias_channel_info, 1267 &sfp_hwmon_power_channel_info, 1268 NULL, 1269 }; 1270 1271 static const struct hwmon_chip_info sfp_hwmon_chip_info = { 1272 .ops = &sfp_hwmon_ops, 1273 .info = sfp_hwmon_info, 1274 }; 1275 1276 static void sfp_hwmon_probe(struct work_struct *work) 1277 { 1278 struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work); 1279 int err, i; 1280 1281 /* hwmon interface needs to access 16bit registers in atomic way to 1282 * guarantee coherency of the diagnostic monitoring data. If it is not 1283 * possible to guarantee coherency because EEPROM is broken in such way 1284 * that does not support atomic 16bit read operation then we have to 1285 * skip registration of hwmon device. 1286 */ 1287 if (sfp->i2c_block_size < 2) { 1288 dev_info(sfp->dev, 1289 "skipping hwmon device registration due to broken EEPROM\n"); 1290 dev_info(sfp->dev, 1291 "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n"); 1292 return; 1293 } 1294 1295 err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag)); 1296 if (err < 0) { 1297 if (sfp->hwmon_tries--) { 1298 mod_delayed_work(system_wq, &sfp->hwmon_probe, 1299 T_PROBE_RETRY_SLOW); 1300 } else { 1301 dev_warn(sfp->dev, "hwmon probe failed: %d\n", err); 1302 } 1303 return; 1304 } 1305 1306 sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL); 1307 if (!sfp->hwmon_name) { 1308 dev_err(sfp->dev, "out of memory for hwmon name\n"); 1309 return; 1310 } 1311 1312 for (i = 0; sfp->hwmon_name[i]; i++) 1313 if (hwmon_is_bad_char(sfp->hwmon_name[i])) 1314 sfp->hwmon_name[i] = '_'; 1315 1316 sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev, 1317 sfp->hwmon_name, sfp, 1318 &sfp_hwmon_chip_info, 1319 NULL); 1320 if (IS_ERR(sfp->hwmon_dev)) 1321 dev_err(sfp->dev, "failed to register hwmon device: %ld\n", 1322 PTR_ERR(sfp->hwmon_dev)); 1323 } 1324 1325 static int sfp_hwmon_insert(struct sfp *sfp) 1326 { 1327 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE) 1328 return 0; 1329 1330 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM)) 1331 return 0; 1332 1333 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) 1334 /* This driver in general does not support address 1335 * change. 1336 */ 1337 return 0; 1338 1339 mod_delayed_work(system_wq, &sfp->hwmon_probe, 1); 1340 sfp->hwmon_tries = R_PROBE_RETRY_SLOW; 1341 1342 return 0; 1343 } 1344 1345 static void sfp_hwmon_remove(struct sfp *sfp) 1346 { 1347 cancel_delayed_work_sync(&sfp->hwmon_probe); 1348 if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) { 1349 hwmon_device_unregister(sfp->hwmon_dev); 1350 sfp->hwmon_dev = NULL; 1351 kfree(sfp->hwmon_name); 1352 } 1353 } 1354 1355 static int sfp_hwmon_init(struct sfp *sfp) 1356 { 1357 INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe); 1358 1359 return 0; 1360 } 1361 1362 static void sfp_hwmon_exit(struct sfp *sfp) 1363 { 1364 cancel_delayed_work_sync(&sfp->hwmon_probe); 1365 } 1366 #else 1367 static int sfp_hwmon_insert(struct sfp *sfp) 1368 { 1369 return 0; 1370 } 1371 1372 static void sfp_hwmon_remove(struct sfp *sfp) 1373 { 1374 } 1375 1376 static int sfp_hwmon_init(struct sfp *sfp) 1377 { 1378 return 0; 1379 } 1380 1381 static void sfp_hwmon_exit(struct sfp *sfp) 1382 { 1383 } 1384 #endif 1385 1386 /* Helpers */ 1387 static void sfp_module_tx_disable(struct sfp *sfp) 1388 { 1389 dev_dbg(sfp->dev, "tx disable %u -> %u\n", 1390 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1); 1391 sfp->state |= SFP_F_TX_DISABLE; 1392 sfp_set_state(sfp, sfp->state); 1393 } 1394 1395 static void sfp_module_tx_enable(struct sfp *sfp) 1396 { 1397 dev_dbg(sfp->dev, "tx disable %u -> %u\n", 1398 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0); 1399 sfp->state &= ~SFP_F_TX_DISABLE; 1400 sfp_set_state(sfp, sfp->state); 1401 } 1402 1403 #if IS_ENABLED(CONFIG_DEBUG_FS) 1404 static int sfp_debug_state_show(struct seq_file *s, void *data) 1405 { 1406 struct sfp *sfp = s->private; 1407 1408 seq_printf(s, "Module state: %s\n", 1409 mod_state_to_str(sfp->sm_mod_state)); 1410 seq_printf(s, "Module probe attempts: %d %d\n", 1411 R_PROBE_RETRY_INIT - sfp->sm_mod_tries_init, 1412 R_PROBE_RETRY_SLOW - sfp->sm_mod_tries); 1413 seq_printf(s, "Device state: %s\n", 1414 dev_state_to_str(sfp->sm_dev_state)); 1415 seq_printf(s, "Main state: %s\n", 1416 sm_state_to_str(sfp->sm_state)); 1417 seq_printf(s, "Fault recovery remaining retries: %d\n", 1418 sfp->sm_fault_retries); 1419 seq_printf(s, "PHY probe remaining retries: %d\n", 1420 sfp->sm_phy_retries); 1421 seq_printf(s, "moddef0: %d\n", !!(sfp->state & SFP_F_PRESENT)); 1422 seq_printf(s, "rx_los: %d\n", !!(sfp->state & SFP_F_LOS)); 1423 seq_printf(s, "tx_fault: %d\n", !!(sfp->state & SFP_F_TX_FAULT)); 1424 seq_printf(s, "tx_disable: %d\n", !!(sfp->state & SFP_F_TX_DISABLE)); 1425 return 0; 1426 } 1427 DEFINE_SHOW_ATTRIBUTE(sfp_debug_state); 1428 1429 static void sfp_debugfs_init(struct sfp *sfp) 1430 { 1431 sfp->debugfs_dir = debugfs_create_dir(dev_name(sfp->dev), NULL); 1432 1433 debugfs_create_file("state", 0600, sfp->debugfs_dir, sfp, 1434 &sfp_debug_state_fops); 1435 } 1436 1437 static void sfp_debugfs_exit(struct sfp *sfp) 1438 { 1439 debugfs_remove_recursive(sfp->debugfs_dir); 1440 } 1441 #else 1442 static void sfp_debugfs_init(struct sfp *sfp) 1443 { 1444 } 1445 1446 static void sfp_debugfs_exit(struct sfp *sfp) 1447 { 1448 } 1449 #endif 1450 1451 static void sfp_module_tx_fault_reset(struct sfp *sfp) 1452 { 1453 unsigned int state = sfp->state; 1454 1455 if (state & SFP_F_TX_DISABLE) 1456 return; 1457 1458 sfp_set_state(sfp, state | SFP_F_TX_DISABLE); 1459 1460 udelay(T_RESET_US); 1461 1462 sfp_set_state(sfp, state); 1463 } 1464 1465 /* SFP state machine */ 1466 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout) 1467 { 1468 if (timeout) 1469 mod_delayed_work(system_power_efficient_wq, &sfp->timeout, 1470 timeout); 1471 else 1472 cancel_delayed_work(&sfp->timeout); 1473 } 1474 1475 static void sfp_sm_next(struct sfp *sfp, unsigned int state, 1476 unsigned int timeout) 1477 { 1478 sfp->sm_state = state; 1479 sfp_sm_set_timer(sfp, timeout); 1480 } 1481 1482 static void sfp_sm_mod_next(struct sfp *sfp, unsigned int state, 1483 unsigned int timeout) 1484 { 1485 sfp->sm_mod_state = state; 1486 sfp_sm_set_timer(sfp, timeout); 1487 } 1488 1489 static void sfp_sm_phy_detach(struct sfp *sfp) 1490 { 1491 sfp_remove_phy(sfp->sfp_bus); 1492 phy_device_remove(sfp->mod_phy); 1493 phy_device_free(sfp->mod_phy); 1494 sfp->mod_phy = NULL; 1495 } 1496 1497 static int sfp_sm_probe_phy(struct sfp *sfp, bool is_c45) 1498 { 1499 struct phy_device *phy; 1500 int err; 1501 1502 phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45); 1503 if (phy == ERR_PTR(-ENODEV)) 1504 return PTR_ERR(phy); 1505 if (IS_ERR(phy)) { 1506 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy)); 1507 return PTR_ERR(phy); 1508 } 1509 1510 err = phy_device_register(phy); 1511 if (err) { 1512 phy_device_free(phy); 1513 dev_err(sfp->dev, "phy_device_register failed: %d\n", err); 1514 return err; 1515 } 1516 1517 err = sfp_add_phy(sfp->sfp_bus, phy); 1518 if (err) { 1519 phy_device_remove(phy); 1520 phy_device_free(phy); 1521 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err); 1522 return err; 1523 } 1524 1525 sfp->mod_phy = phy; 1526 1527 return 0; 1528 } 1529 1530 static void sfp_sm_link_up(struct sfp *sfp) 1531 { 1532 sfp_link_up(sfp->sfp_bus); 1533 sfp_sm_next(sfp, SFP_S_LINK_UP, 0); 1534 } 1535 1536 static void sfp_sm_link_down(struct sfp *sfp) 1537 { 1538 sfp_link_down(sfp->sfp_bus); 1539 } 1540 1541 static void sfp_sm_link_check_los(struct sfp *sfp) 1542 { 1543 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED); 1544 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL); 1545 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal); 1546 bool los = false; 1547 1548 /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL 1549 * are set, we assume that no LOS signal is available. If both are 1550 * set, we assume LOS is not implemented (and is meaningless.) 1551 */ 1552 if (los_options == los_inverted) 1553 los = !(sfp->state & SFP_F_LOS); 1554 else if (los_options == los_normal) 1555 los = !!(sfp->state & SFP_F_LOS); 1556 1557 if (los) 1558 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0); 1559 else 1560 sfp_sm_link_up(sfp); 1561 } 1562 1563 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event) 1564 { 1565 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED); 1566 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL); 1567 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal); 1568 1569 return (los_options == los_inverted && event == SFP_E_LOS_LOW) || 1570 (los_options == los_normal && event == SFP_E_LOS_HIGH); 1571 } 1572 1573 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event) 1574 { 1575 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED); 1576 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL); 1577 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal); 1578 1579 return (los_options == los_inverted && event == SFP_E_LOS_HIGH) || 1580 (los_options == los_normal && event == SFP_E_LOS_LOW); 1581 } 1582 1583 static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn) 1584 { 1585 if (sfp->sm_fault_retries && !--sfp->sm_fault_retries) { 1586 dev_err(sfp->dev, 1587 "module persistently indicates fault, disabling\n"); 1588 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0); 1589 } else { 1590 if (warn) 1591 dev_err(sfp->dev, "module transmit fault indicated\n"); 1592 1593 sfp_sm_next(sfp, next_state, T_FAULT_RECOVER); 1594 } 1595 } 1596 1597 /* Probe a SFP for a PHY device if the module supports copper - the PHY 1598 * normally sits at I2C bus address 0x56, and may either be a clause 22 1599 * or clause 45 PHY. 1600 * 1601 * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with 1602 * negotiation enabled, but some may be in 1000base-X - which is for the 1603 * PHY driver to determine. 1604 * 1605 * Clause 45 copper SFP+ modules (10G) appear to switch their interface 1606 * mode according to the negotiated line speed. 1607 */ 1608 static int sfp_sm_probe_for_phy(struct sfp *sfp) 1609 { 1610 int err = 0; 1611 1612 switch (sfp->id.base.extended_cc) { 1613 case SFF8024_ECC_10GBASE_T_SFI: 1614 case SFF8024_ECC_10GBASE_T_SR: 1615 case SFF8024_ECC_5GBASE_T: 1616 case SFF8024_ECC_2_5GBASE_T: 1617 err = sfp_sm_probe_phy(sfp, true); 1618 break; 1619 1620 default: 1621 if (sfp->id.base.e1000_base_t) 1622 err = sfp_sm_probe_phy(sfp, false); 1623 break; 1624 } 1625 return err; 1626 } 1627 1628 static int sfp_module_parse_power(struct sfp *sfp) 1629 { 1630 u32 power_mW = 1000; 1631 1632 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL)) 1633 power_mW = 1500; 1634 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL)) 1635 power_mW = 2000; 1636 1637 if (power_mW > sfp->max_power_mW) { 1638 /* Module power specification exceeds the allowed maximum. */ 1639 if (sfp->id.ext.sff8472_compliance == 1640 SFP_SFF8472_COMPLIANCE_NONE && 1641 !(sfp->id.ext.diagmon & SFP_DIAGMON_DDM)) { 1642 /* The module appears not to implement bus address 1643 * 0xa2, so assume that the module powers up in the 1644 * indicated mode. 1645 */ 1646 dev_err(sfp->dev, 1647 "Host does not support %u.%uW modules\n", 1648 power_mW / 1000, (power_mW / 100) % 10); 1649 return -EINVAL; 1650 } else { 1651 dev_warn(sfp->dev, 1652 "Host does not support %u.%uW modules, module left in power mode 1\n", 1653 power_mW / 1000, (power_mW / 100) % 10); 1654 return 0; 1655 } 1656 } 1657 1658 /* If the module requires a higher power mode, but also requires 1659 * an address change sequence, warn the user that the module may 1660 * not be functional. 1661 */ 1662 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE && power_mW > 1000) { 1663 dev_warn(sfp->dev, 1664 "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n", 1665 power_mW / 1000, (power_mW / 100) % 10); 1666 return 0; 1667 } 1668 1669 sfp->module_power_mW = power_mW; 1670 1671 return 0; 1672 } 1673 1674 static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable) 1675 { 1676 u8 val; 1677 int err; 1678 1679 err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val)); 1680 if (err != sizeof(val)) { 1681 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err); 1682 return -EAGAIN; 1683 } 1684 1685 /* DM7052 reports as a high power module, responds to reads (with 1686 * all bytes 0xff) at 0x51 but does not accept writes. In any case, 1687 * if the bit is already set, we're already in high power mode. 1688 */ 1689 if (!!(val & BIT(0)) == enable) 1690 return 0; 1691 1692 if (enable) 1693 val |= BIT(0); 1694 else 1695 val &= ~BIT(0); 1696 1697 err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val)); 1698 if (err != sizeof(val)) { 1699 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err); 1700 return -EAGAIN; 1701 } 1702 1703 if (enable) 1704 dev_info(sfp->dev, "Module switched to %u.%uW power level\n", 1705 sfp->module_power_mW / 1000, 1706 (sfp->module_power_mW / 100) % 10); 1707 1708 return 0; 1709 } 1710 1711 /* GPON modules based on Realtek RTL8672 and RTL9601C chips (e.g. V-SOL 1712 * V2801F, CarlitoxxPro CPGOS03-0490, Ubiquiti U-Fiber Instant, ...) do 1713 * not support multibyte reads from the EEPROM. Each multi-byte read 1714 * operation returns just one byte of EEPROM followed by zeros. There is 1715 * no way to identify which modules are using Realtek RTL8672 and RTL9601C 1716 * chips. Moreover every OEM of V-SOL V2801F module puts its own vendor 1717 * name and vendor id into EEPROM, so there is even no way to detect if 1718 * module is V-SOL V2801F. Therefore check for those zeros in the read 1719 * data and then based on check switch to reading EEPROM to one byte 1720 * at a time. 1721 */ 1722 static bool sfp_id_needs_byte_io(struct sfp *sfp, void *buf, size_t len) 1723 { 1724 size_t i, block_size = sfp->i2c_block_size; 1725 1726 /* Already using byte IO */ 1727 if (block_size == 1) 1728 return false; 1729 1730 for (i = 1; i < len; i += block_size) { 1731 if (memchr_inv(buf + i, '\0', min(block_size - 1, len - i))) 1732 return false; 1733 } 1734 return true; 1735 } 1736 1737 static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id) 1738 { 1739 u8 check; 1740 int err; 1741 1742 if (id->base.phys_id != SFF8024_ID_SFF_8472 || 1743 id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP || 1744 id->base.connector != SFF8024_CONNECTOR_LC) { 1745 dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n"); 1746 id->base.phys_id = SFF8024_ID_SFF_8472; 1747 id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP; 1748 id->base.connector = SFF8024_CONNECTOR_LC; 1749 err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3); 1750 if (err != 3) { 1751 dev_err(sfp->dev, "Failed to rewrite module EEPROM: %d\n", err); 1752 return err; 1753 } 1754 1755 /* Cotsworks modules have been found to require a delay between write operations. */ 1756 mdelay(50); 1757 1758 /* Update base structure checksum */ 1759 check = sfp_check(&id->base, sizeof(id->base) - 1); 1760 err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1); 1761 if (err != 1) { 1762 dev_err(sfp->dev, "Failed to update base structure checksum in fiber module EEPROM: %d\n", err); 1763 return err; 1764 } 1765 } 1766 return 0; 1767 } 1768 1769 static int sfp_sm_mod_probe(struct sfp *sfp, bool report) 1770 { 1771 /* SFP module inserted - read I2C data */ 1772 struct sfp_eeprom_id id; 1773 bool cotsworks_sfbg; 1774 bool cotsworks; 1775 u8 check; 1776 int ret; 1777 1778 /* Some SFP modules and also some Linux I2C drivers do not like reads 1779 * longer than 16 bytes, so read the EEPROM in chunks of 16 bytes at 1780 * a time. 1781 */ 1782 sfp->i2c_block_size = 16; 1783 1784 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base)); 1785 if (ret < 0) { 1786 if (report) 1787 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret); 1788 return -EAGAIN; 1789 } 1790 1791 if (ret != sizeof(id.base)) { 1792 dev_err(sfp->dev, "EEPROM short read: %d\n", ret); 1793 return -EAGAIN; 1794 } 1795 1796 /* Some SFP modules (e.g. Nokia 3FE46541AA) lock up if read from 1797 * address 0x51 is just one byte at a time. Also SFF-8472 requires 1798 * that EEPROM supports atomic 16bit read operation for diagnostic 1799 * fields, so do not switch to one byte reading at a time unless it 1800 * is really required and we have no other option. 1801 */ 1802 if (sfp_id_needs_byte_io(sfp, &id.base, sizeof(id.base))) { 1803 dev_info(sfp->dev, 1804 "Detected broken RTL8672/RTL9601C emulated EEPROM\n"); 1805 dev_info(sfp->dev, 1806 "Switching to reading EEPROM to one byte at a time\n"); 1807 sfp->i2c_block_size = 1; 1808 1809 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base)); 1810 if (ret < 0) { 1811 if (report) 1812 dev_err(sfp->dev, "failed to read EEPROM: %d\n", 1813 ret); 1814 return -EAGAIN; 1815 } 1816 1817 if (ret != sizeof(id.base)) { 1818 dev_err(sfp->dev, "EEPROM short read: %d\n", ret); 1819 return -EAGAIN; 1820 } 1821 } 1822 1823 /* Cotsworks do not seem to update the checksums when they 1824 * do the final programming with the final module part number, 1825 * serial number and date code. 1826 */ 1827 cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16); 1828 cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4); 1829 1830 /* Cotsworks SFF module EEPROM do not always have valid phys_id, 1831 * phys_ext_id, and connector bytes. Rewrite SFF EEPROM bytes if 1832 * Cotsworks PN matches and bytes are not correct. 1833 */ 1834 if (cotsworks && cotsworks_sfbg) { 1835 ret = sfp_cotsworks_fixup_check(sfp, &id); 1836 if (ret < 0) 1837 return ret; 1838 } 1839 1840 /* Validate the checksum over the base structure */ 1841 check = sfp_check(&id.base, sizeof(id.base) - 1); 1842 if (check != id.base.cc_base) { 1843 if (cotsworks) { 1844 dev_warn(sfp->dev, 1845 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n", 1846 check, id.base.cc_base); 1847 } else { 1848 dev_err(sfp->dev, 1849 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n", 1850 check, id.base.cc_base); 1851 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET, 1852 16, 1, &id, sizeof(id), true); 1853 return -EINVAL; 1854 } 1855 } 1856 1857 ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext)); 1858 if (ret < 0) { 1859 if (report) 1860 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret); 1861 return -EAGAIN; 1862 } 1863 1864 if (ret != sizeof(id.ext)) { 1865 dev_err(sfp->dev, "EEPROM short read: %d\n", ret); 1866 return -EAGAIN; 1867 } 1868 1869 check = sfp_check(&id.ext, sizeof(id.ext) - 1); 1870 if (check != id.ext.cc_ext) { 1871 if (cotsworks) { 1872 dev_warn(sfp->dev, 1873 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n", 1874 check, id.ext.cc_ext); 1875 } else { 1876 dev_err(sfp->dev, 1877 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n", 1878 check, id.ext.cc_ext); 1879 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET, 1880 16, 1, &id, sizeof(id), true); 1881 memset(&id.ext, 0, sizeof(id.ext)); 1882 } 1883 } 1884 1885 sfp->id = id; 1886 1887 dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n", 1888 (int)sizeof(id.base.vendor_name), id.base.vendor_name, 1889 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn, 1890 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev, 1891 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn, 1892 (int)sizeof(id.ext.datecode), id.ext.datecode); 1893 1894 /* Check whether we support this module */ 1895 if (!sfp->type->module_supported(&id)) { 1896 dev_err(sfp->dev, 1897 "module is not supported - phys id 0x%02x 0x%02x\n", 1898 sfp->id.base.phys_id, sfp->id.base.phys_ext_id); 1899 return -EINVAL; 1900 } 1901 1902 /* If the module requires address swap mode, warn about it */ 1903 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) 1904 dev_warn(sfp->dev, 1905 "module address swap to access page 0xA2 is not supported.\n"); 1906 1907 /* Parse the module power requirement */ 1908 ret = sfp_module_parse_power(sfp); 1909 if (ret < 0) 1910 return ret; 1911 1912 if (!memcmp(id.base.vendor_name, "ALCATELLUCENT ", 16) && 1913 !memcmp(id.base.vendor_pn, "3FE46541AA ", 16)) 1914 sfp->module_t_start_up = T_START_UP_BAD_GPON; 1915 else 1916 sfp->module_t_start_up = T_START_UP; 1917 1918 return 0; 1919 } 1920 1921 static void sfp_sm_mod_remove(struct sfp *sfp) 1922 { 1923 if (sfp->sm_mod_state > SFP_MOD_WAITDEV) 1924 sfp_module_remove(sfp->sfp_bus); 1925 1926 sfp_hwmon_remove(sfp); 1927 1928 memset(&sfp->id, 0, sizeof(sfp->id)); 1929 sfp->module_power_mW = 0; 1930 1931 dev_info(sfp->dev, "module removed\n"); 1932 } 1933 1934 /* This state machine tracks the upstream's state */ 1935 static void sfp_sm_device(struct sfp *sfp, unsigned int event) 1936 { 1937 switch (sfp->sm_dev_state) { 1938 default: 1939 if (event == SFP_E_DEV_ATTACH) 1940 sfp->sm_dev_state = SFP_DEV_DOWN; 1941 break; 1942 1943 case SFP_DEV_DOWN: 1944 if (event == SFP_E_DEV_DETACH) 1945 sfp->sm_dev_state = SFP_DEV_DETACHED; 1946 else if (event == SFP_E_DEV_UP) 1947 sfp->sm_dev_state = SFP_DEV_UP; 1948 break; 1949 1950 case SFP_DEV_UP: 1951 if (event == SFP_E_DEV_DETACH) 1952 sfp->sm_dev_state = SFP_DEV_DETACHED; 1953 else if (event == SFP_E_DEV_DOWN) 1954 sfp->sm_dev_state = SFP_DEV_DOWN; 1955 break; 1956 } 1957 } 1958 1959 /* This state machine tracks the insert/remove state of the module, probes 1960 * the on-board EEPROM, and sets up the power level. 1961 */ 1962 static void sfp_sm_module(struct sfp *sfp, unsigned int event) 1963 { 1964 int err; 1965 1966 /* Handle remove event globally, it resets this state machine */ 1967 if (event == SFP_E_REMOVE) { 1968 if (sfp->sm_mod_state > SFP_MOD_PROBE) 1969 sfp_sm_mod_remove(sfp); 1970 sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0); 1971 return; 1972 } 1973 1974 /* Handle device detach globally */ 1975 if (sfp->sm_dev_state < SFP_DEV_DOWN && 1976 sfp->sm_mod_state > SFP_MOD_WAITDEV) { 1977 if (sfp->module_power_mW > 1000 && 1978 sfp->sm_mod_state > SFP_MOD_HPOWER) 1979 sfp_sm_mod_hpower(sfp, false); 1980 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0); 1981 return; 1982 } 1983 1984 switch (sfp->sm_mod_state) { 1985 default: 1986 if (event == SFP_E_INSERT) { 1987 sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL); 1988 sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT; 1989 sfp->sm_mod_tries = R_PROBE_RETRY_SLOW; 1990 } 1991 break; 1992 1993 case SFP_MOD_PROBE: 1994 /* Wait for T_PROBE_INIT to time out */ 1995 if (event != SFP_E_TIMEOUT) 1996 break; 1997 1998 err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1); 1999 if (err == -EAGAIN) { 2000 if (sfp->sm_mod_tries_init && 2001 --sfp->sm_mod_tries_init) { 2002 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT); 2003 break; 2004 } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) { 2005 if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1) 2006 dev_warn(sfp->dev, 2007 "please wait, module slow to respond\n"); 2008 sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW); 2009 break; 2010 } 2011 } 2012 if (err < 0) { 2013 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0); 2014 break; 2015 } 2016 2017 err = sfp_hwmon_insert(sfp); 2018 if (err) 2019 dev_warn(sfp->dev, "hwmon probe failed: %d\n", err); 2020 2021 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0); 2022 fallthrough; 2023 case SFP_MOD_WAITDEV: 2024 /* Ensure that the device is attached before proceeding */ 2025 if (sfp->sm_dev_state < SFP_DEV_DOWN) 2026 break; 2027 2028 /* Report the module insertion to the upstream device */ 2029 err = sfp_module_insert(sfp->sfp_bus, &sfp->id); 2030 if (err < 0) { 2031 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0); 2032 break; 2033 } 2034 2035 /* If this is a power level 1 module, we are done */ 2036 if (sfp->module_power_mW <= 1000) 2037 goto insert; 2038 2039 sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0); 2040 fallthrough; 2041 case SFP_MOD_HPOWER: 2042 /* Enable high power mode */ 2043 err = sfp_sm_mod_hpower(sfp, true); 2044 if (err < 0) { 2045 if (err != -EAGAIN) { 2046 sfp_module_remove(sfp->sfp_bus); 2047 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0); 2048 } else { 2049 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT); 2050 } 2051 break; 2052 } 2053 2054 sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL); 2055 break; 2056 2057 case SFP_MOD_WAITPWR: 2058 /* Wait for T_HPOWER_LEVEL to time out */ 2059 if (event != SFP_E_TIMEOUT) 2060 break; 2061 2062 insert: 2063 sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0); 2064 break; 2065 2066 case SFP_MOD_PRESENT: 2067 case SFP_MOD_ERROR: 2068 break; 2069 } 2070 } 2071 2072 static void sfp_sm_main(struct sfp *sfp, unsigned int event) 2073 { 2074 unsigned long timeout; 2075 int ret; 2076 2077 /* Some events are global */ 2078 if (sfp->sm_state != SFP_S_DOWN && 2079 (sfp->sm_mod_state != SFP_MOD_PRESENT || 2080 sfp->sm_dev_state != SFP_DEV_UP)) { 2081 if (sfp->sm_state == SFP_S_LINK_UP && 2082 sfp->sm_dev_state == SFP_DEV_UP) 2083 sfp_sm_link_down(sfp); 2084 if (sfp->sm_state > SFP_S_INIT) 2085 sfp_module_stop(sfp->sfp_bus); 2086 if (sfp->mod_phy) 2087 sfp_sm_phy_detach(sfp); 2088 sfp_module_tx_disable(sfp); 2089 sfp_soft_stop_poll(sfp); 2090 sfp_sm_next(sfp, SFP_S_DOWN, 0); 2091 return; 2092 } 2093 2094 /* The main state machine */ 2095 switch (sfp->sm_state) { 2096 case SFP_S_DOWN: 2097 if (sfp->sm_mod_state != SFP_MOD_PRESENT || 2098 sfp->sm_dev_state != SFP_DEV_UP) 2099 break; 2100 2101 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) 2102 sfp_soft_start_poll(sfp); 2103 2104 sfp_module_tx_enable(sfp); 2105 2106 /* Initialise the fault clearance retries */ 2107 sfp->sm_fault_retries = N_FAULT_INIT; 2108 2109 /* We need to check the TX_FAULT state, which is not defined 2110 * while TX_DISABLE is asserted. The earliest we want to do 2111 * anything (such as probe for a PHY) is 50ms. 2112 */ 2113 sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT); 2114 break; 2115 2116 case SFP_S_WAIT: 2117 if (event != SFP_E_TIMEOUT) 2118 break; 2119 2120 if (sfp->state & SFP_F_TX_FAULT) { 2121 /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431) 2122 * from the TX_DISABLE deassertion for the module to 2123 * initialise, which is indicated by TX_FAULT 2124 * deasserting. 2125 */ 2126 timeout = sfp->module_t_start_up; 2127 if (timeout > T_WAIT) 2128 timeout -= T_WAIT; 2129 else 2130 timeout = 1; 2131 2132 sfp_sm_next(sfp, SFP_S_INIT, timeout); 2133 } else { 2134 /* TX_FAULT is not asserted, assume the module has 2135 * finished initialising. 2136 */ 2137 goto init_done; 2138 } 2139 break; 2140 2141 case SFP_S_INIT: 2142 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) { 2143 /* TX_FAULT is still asserted after t_init or 2144 * or t_start_up, so assume there is a fault. 2145 */ 2146 sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT, 2147 sfp->sm_fault_retries == N_FAULT_INIT); 2148 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { 2149 init_done: 2150 sfp->sm_phy_retries = R_PHY_RETRY; 2151 goto phy_probe; 2152 } 2153 break; 2154 2155 case SFP_S_INIT_PHY: 2156 if (event != SFP_E_TIMEOUT) 2157 break; 2158 phy_probe: 2159 /* TX_FAULT deasserted or we timed out with TX_FAULT 2160 * clear. Probe for the PHY and check the LOS state. 2161 */ 2162 ret = sfp_sm_probe_for_phy(sfp); 2163 if (ret == -ENODEV) { 2164 if (--sfp->sm_phy_retries) { 2165 sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY); 2166 break; 2167 } else { 2168 dev_info(sfp->dev, "no PHY detected\n"); 2169 } 2170 } else if (ret) { 2171 sfp_sm_next(sfp, SFP_S_FAIL, 0); 2172 break; 2173 } 2174 if (sfp_module_start(sfp->sfp_bus)) { 2175 sfp_sm_next(sfp, SFP_S_FAIL, 0); 2176 break; 2177 } 2178 sfp_sm_link_check_los(sfp); 2179 2180 /* Reset the fault retry count */ 2181 sfp->sm_fault_retries = N_FAULT; 2182 break; 2183 2184 case SFP_S_INIT_TX_FAULT: 2185 if (event == SFP_E_TIMEOUT) { 2186 sfp_module_tx_fault_reset(sfp); 2187 sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up); 2188 } 2189 break; 2190 2191 case SFP_S_WAIT_LOS: 2192 if (event == SFP_E_TX_FAULT) 2193 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true); 2194 else if (sfp_los_event_inactive(sfp, event)) 2195 sfp_sm_link_up(sfp); 2196 break; 2197 2198 case SFP_S_LINK_UP: 2199 if (event == SFP_E_TX_FAULT) { 2200 sfp_sm_link_down(sfp); 2201 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true); 2202 } else if (sfp_los_event_active(sfp, event)) { 2203 sfp_sm_link_down(sfp); 2204 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0); 2205 } 2206 break; 2207 2208 case SFP_S_TX_FAULT: 2209 if (event == SFP_E_TIMEOUT) { 2210 sfp_module_tx_fault_reset(sfp); 2211 sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up); 2212 } 2213 break; 2214 2215 case SFP_S_REINIT: 2216 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) { 2217 sfp_sm_fault(sfp, SFP_S_TX_FAULT, false); 2218 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { 2219 dev_info(sfp->dev, "module transmit fault recovered\n"); 2220 sfp_sm_link_check_los(sfp); 2221 } 2222 break; 2223 2224 case SFP_S_TX_DISABLE: 2225 break; 2226 } 2227 } 2228 2229 static void sfp_sm_event(struct sfp *sfp, unsigned int event) 2230 { 2231 mutex_lock(&sfp->sm_mutex); 2232 2233 dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n", 2234 mod_state_to_str(sfp->sm_mod_state), 2235 dev_state_to_str(sfp->sm_dev_state), 2236 sm_state_to_str(sfp->sm_state), 2237 event_to_str(event)); 2238 2239 sfp_sm_device(sfp, event); 2240 sfp_sm_module(sfp, event); 2241 sfp_sm_main(sfp, event); 2242 2243 dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n", 2244 mod_state_to_str(sfp->sm_mod_state), 2245 dev_state_to_str(sfp->sm_dev_state), 2246 sm_state_to_str(sfp->sm_state)); 2247 2248 mutex_unlock(&sfp->sm_mutex); 2249 } 2250 2251 static void sfp_attach(struct sfp *sfp) 2252 { 2253 sfp_sm_event(sfp, SFP_E_DEV_ATTACH); 2254 } 2255 2256 static void sfp_detach(struct sfp *sfp) 2257 { 2258 sfp_sm_event(sfp, SFP_E_DEV_DETACH); 2259 } 2260 2261 static void sfp_start(struct sfp *sfp) 2262 { 2263 sfp_sm_event(sfp, SFP_E_DEV_UP); 2264 } 2265 2266 static void sfp_stop(struct sfp *sfp) 2267 { 2268 sfp_sm_event(sfp, SFP_E_DEV_DOWN); 2269 } 2270 2271 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo) 2272 { 2273 /* locking... and check module is present */ 2274 2275 if (sfp->id.ext.sff8472_compliance && 2276 !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) { 2277 modinfo->type = ETH_MODULE_SFF_8472; 2278 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN; 2279 } else { 2280 modinfo->type = ETH_MODULE_SFF_8079; 2281 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN; 2282 } 2283 return 0; 2284 } 2285 2286 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee, 2287 u8 *data) 2288 { 2289 unsigned int first, last, len; 2290 int ret; 2291 2292 if (ee->len == 0) 2293 return -EINVAL; 2294 2295 first = ee->offset; 2296 last = ee->offset + ee->len; 2297 if (first < ETH_MODULE_SFF_8079_LEN) { 2298 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN); 2299 len -= first; 2300 2301 ret = sfp_read(sfp, false, first, data, len); 2302 if (ret < 0) 2303 return ret; 2304 2305 first += len; 2306 data += len; 2307 } 2308 if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) { 2309 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN); 2310 len -= first; 2311 first -= ETH_MODULE_SFF_8079_LEN; 2312 2313 ret = sfp_read(sfp, true, first, data, len); 2314 if (ret < 0) 2315 return ret; 2316 } 2317 return 0; 2318 } 2319 2320 static const struct sfp_socket_ops sfp_module_ops = { 2321 .attach = sfp_attach, 2322 .detach = sfp_detach, 2323 .start = sfp_start, 2324 .stop = sfp_stop, 2325 .module_info = sfp_module_info, 2326 .module_eeprom = sfp_module_eeprom, 2327 }; 2328 2329 static void sfp_timeout(struct work_struct *work) 2330 { 2331 struct sfp *sfp = container_of(work, struct sfp, timeout.work); 2332 2333 rtnl_lock(); 2334 sfp_sm_event(sfp, SFP_E_TIMEOUT); 2335 rtnl_unlock(); 2336 } 2337 2338 static void sfp_check_state(struct sfp *sfp) 2339 { 2340 unsigned int state, i, changed; 2341 2342 mutex_lock(&sfp->st_mutex); 2343 state = sfp_get_state(sfp); 2344 changed = state ^ sfp->state; 2345 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT; 2346 2347 for (i = 0; i < GPIO_MAX; i++) 2348 if (changed & BIT(i)) 2349 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i], 2350 !!(sfp->state & BIT(i)), !!(state & BIT(i))); 2351 2352 state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT); 2353 sfp->state = state; 2354 2355 rtnl_lock(); 2356 if (changed & SFP_F_PRESENT) 2357 sfp_sm_event(sfp, state & SFP_F_PRESENT ? 2358 SFP_E_INSERT : SFP_E_REMOVE); 2359 2360 if (changed & SFP_F_TX_FAULT) 2361 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ? 2362 SFP_E_TX_FAULT : SFP_E_TX_CLEAR); 2363 2364 if (changed & SFP_F_LOS) 2365 sfp_sm_event(sfp, state & SFP_F_LOS ? 2366 SFP_E_LOS_HIGH : SFP_E_LOS_LOW); 2367 rtnl_unlock(); 2368 mutex_unlock(&sfp->st_mutex); 2369 } 2370 2371 static irqreturn_t sfp_irq(int irq, void *data) 2372 { 2373 struct sfp *sfp = data; 2374 2375 sfp_check_state(sfp); 2376 2377 return IRQ_HANDLED; 2378 } 2379 2380 static void sfp_poll(struct work_struct *work) 2381 { 2382 struct sfp *sfp = container_of(work, struct sfp, poll.work); 2383 2384 sfp_check_state(sfp); 2385 2386 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) || 2387 sfp->need_poll) 2388 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 2389 } 2390 2391 static struct sfp *sfp_alloc(struct device *dev) 2392 { 2393 struct sfp *sfp; 2394 2395 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL); 2396 if (!sfp) 2397 return ERR_PTR(-ENOMEM); 2398 2399 sfp->dev = dev; 2400 2401 mutex_init(&sfp->sm_mutex); 2402 mutex_init(&sfp->st_mutex); 2403 INIT_DELAYED_WORK(&sfp->poll, sfp_poll); 2404 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout); 2405 2406 sfp_hwmon_init(sfp); 2407 2408 return sfp; 2409 } 2410 2411 static void sfp_cleanup(void *data) 2412 { 2413 struct sfp *sfp = data; 2414 2415 sfp_hwmon_exit(sfp); 2416 2417 cancel_delayed_work_sync(&sfp->poll); 2418 cancel_delayed_work_sync(&sfp->timeout); 2419 if (sfp->i2c_mii) { 2420 mdiobus_unregister(sfp->i2c_mii); 2421 mdiobus_free(sfp->i2c_mii); 2422 } 2423 if (sfp->i2c) 2424 i2c_put_adapter(sfp->i2c); 2425 kfree(sfp); 2426 } 2427 2428 static int sfp_probe(struct platform_device *pdev) 2429 { 2430 const struct sff_data *sff; 2431 struct i2c_adapter *i2c; 2432 char *sfp_irq_name; 2433 struct sfp *sfp; 2434 int err, i; 2435 2436 sfp = sfp_alloc(&pdev->dev); 2437 if (IS_ERR(sfp)) 2438 return PTR_ERR(sfp); 2439 2440 platform_set_drvdata(pdev, sfp); 2441 2442 err = devm_add_action(sfp->dev, sfp_cleanup, sfp); 2443 if (err < 0) 2444 return err; 2445 2446 sff = sfp->type = &sfp_data; 2447 2448 if (pdev->dev.of_node) { 2449 struct device_node *node = pdev->dev.of_node; 2450 const struct of_device_id *id; 2451 struct device_node *np; 2452 2453 id = of_match_node(sfp_of_match, node); 2454 if (WARN_ON(!id)) 2455 return -EINVAL; 2456 2457 sff = sfp->type = id->data; 2458 2459 np = of_parse_phandle(node, "i2c-bus", 0); 2460 if (!np) { 2461 dev_err(sfp->dev, "missing 'i2c-bus' property\n"); 2462 return -ENODEV; 2463 } 2464 2465 i2c = of_find_i2c_adapter_by_node(np); 2466 of_node_put(np); 2467 } else if (has_acpi_companion(&pdev->dev)) { 2468 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); 2469 struct fwnode_handle *fw = acpi_fwnode_handle(adev); 2470 struct fwnode_reference_args args; 2471 struct acpi_handle *acpi_handle; 2472 int ret; 2473 2474 ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args); 2475 if (ret || !is_acpi_device_node(args.fwnode)) { 2476 dev_err(&pdev->dev, "missing 'i2c-bus' property\n"); 2477 return -ENODEV; 2478 } 2479 2480 acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode); 2481 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle); 2482 } else { 2483 return -EINVAL; 2484 } 2485 2486 if (!i2c) 2487 return -EPROBE_DEFER; 2488 2489 err = sfp_i2c_configure(sfp, i2c); 2490 if (err < 0) { 2491 i2c_put_adapter(i2c); 2492 return err; 2493 } 2494 2495 for (i = 0; i < GPIO_MAX; i++) 2496 if (sff->gpios & BIT(i)) { 2497 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev, 2498 gpio_of_names[i], gpio_flags[i]); 2499 if (IS_ERR(sfp->gpio[i])) 2500 return PTR_ERR(sfp->gpio[i]); 2501 } 2502 2503 sfp->get_state = sfp_gpio_get_state; 2504 sfp->set_state = sfp_gpio_set_state; 2505 2506 /* Modules that have no detect signal are always present */ 2507 if (!(sfp->gpio[GPIO_MODDEF0])) 2508 sfp->get_state = sff_gpio_get_state; 2509 2510 device_property_read_u32(&pdev->dev, "maximum-power-milliwatt", 2511 &sfp->max_power_mW); 2512 if (!sfp->max_power_mW) 2513 sfp->max_power_mW = 1000; 2514 2515 dev_info(sfp->dev, "Host maximum power %u.%uW\n", 2516 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10); 2517 2518 /* Get the initial state, and always signal TX disable, 2519 * since the network interface will not be up. 2520 */ 2521 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE; 2522 2523 if (sfp->gpio[GPIO_RATE_SELECT] && 2524 gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT])) 2525 sfp->state |= SFP_F_RATE_SELECT; 2526 sfp_set_state(sfp, sfp->state); 2527 sfp_module_tx_disable(sfp); 2528 if (sfp->state & SFP_F_PRESENT) { 2529 rtnl_lock(); 2530 sfp_sm_event(sfp, SFP_E_INSERT); 2531 rtnl_unlock(); 2532 } 2533 2534 for (i = 0; i < GPIO_MAX; i++) { 2535 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i]) 2536 continue; 2537 2538 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]); 2539 if (sfp->gpio_irq[i] < 0) { 2540 sfp->gpio_irq[i] = 0; 2541 sfp->need_poll = true; 2542 continue; 2543 } 2544 2545 sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL, 2546 "%s-%s", dev_name(sfp->dev), 2547 gpio_of_names[i]); 2548 2549 if (!sfp_irq_name) 2550 return -ENOMEM; 2551 2552 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i], 2553 NULL, sfp_irq, 2554 IRQF_ONESHOT | 2555 IRQF_TRIGGER_RISING | 2556 IRQF_TRIGGER_FALLING, 2557 sfp_irq_name, sfp); 2558 if (err) { 2559 sfp->gpio_irq[i] = 0; 2560 sfp->need_poll = true; 2561 } 2562 } 2563 2564 if (sfp->need_poll) 2565 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 2566 2567 /* We could have an issue in cases no Tx disable pin is available or 2568 * wired as modules using a laser as their light source will continue to 2569 * be active when the fiber is removed. This could be a safety issue and 2570 * we should at least warn the user about that. 2571 */ 2572 if (!sfp->gpio[GPIO_TX_DISABLE]) 2573 dev_warn(sfp->dev, 2574 "No tx_disable pin: SFP modules will always be emitting.\n"); 2575 2576 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops); 2577 if (!sfp->sfp_bus) 2578 return -ENOMEM; 2579 2580 sfp_debugfs_init(sfp); 2581 2582 return 0; 2583 } 2584 2585 static int sfp_remove(struct platform_device *pdev) 2586 { 2587 struct sfp *sfp = platform_get_drvdata(pdev); 2588 2589 sfp_debugfs_exit(sfp); 2590 sfp_unregister_socket(sfp->sfp_bus); 2591 2592 rtnl_lock(); 2593 sfp_sm_event(sfp, SFP_E_REMOVE); 2594 rtnl_unlock(); 2595 2596 return 0; 2597 } 2598 2599 static void sfp_shutdown(struct platform_device *pdev) 2600 { 2601 struct sfp *sfp = platform_get_drvdata(pdev); 2602 int i; 2603 2604 for (i = 0; i < GPIO_MAX; i++) { 2605 if (!sfp->gpio_irq[i]) 2606 continue; 2607 2608 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp); 2609 } 2610 2611 cancel_delayed_work_sync(&sfp->poll); 2612 cancel_delayed_work_sync(&sfp->timeout); 2613 } 2614 2615 static struct platform_driver sfp_driver = { 2616 .probe = sfp_probe, 2617 .remove = sfp_remove, 2618 .shutdown = sfp_shutdown, 2619 .driver = { 2620 .name = "sfp", 2621 .of_match_table = sfp_of_match, 2622 }, 2623 }; 2624 2625 static int sfp_init(void) 2626 { 2627 poll_jiffies = msecs_to_jiffies(100); 2628 2629 return platform_driver_register(&sfp_driver); 2630 } 2631 module_init(sfp_init); 2632 2633 static void sfp_exit(void) 2634 { 2635 platform_driver_unregister(&sfp_driver); 2636 } 2637 module_exit(sfp_exit); 2638 2639 MODULE_ALIAS("platform:sfp"); 2640 MODULE_AUTHOR("Russell King"); 2641 MODULE_LICENSE("GPL v2"); 2642