1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/debugfs.h> 3 #include <linux/delay.h> 4 #include <linux/gpio/consumer.h> 5 #include <linux/hwmon.h> 6 #include <linux/i2c.h> 7 #include <linux/interrupt.h> 8 #include <linux/jiffies.h> 9 #include <linux/mdio/mdio-i2c.h> 10 #include <linux/module.h> 11 #include <linux/mutex.h> 12 #include <linux/of.h> 13 #include <linux/phy.h> 14 #include <linux/platform_device.h> 15 #include <linux/rtnetlink.h> 16 #include <linux/slab.h> 17 #include <linux/workqueue.h> 18 19 #include "sfp.h" 20 #include "swphy.h" 21 22 enum { 23 GPIO_MODDEF0, 24 GPIO_LOS, 25 GPIO_TX_FAULT, 26 GPIO_TX_DISABLE, 27 GPIO_RS0, 28 GPIO_RS1, 29 GPIO_MAX, 30 31 SFP_F_PRESENT = BIT(GPIO_MODDEF0), 32 SFP_F_LOS = BIT(GPIO_LOS), 33 SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT), 34 SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE), 35 SFP_F_RS0 = BIT(GPIO_RS0), 36 SFP_F_RS1 = BIT(GPIO_RS1), 37 38 SFP_F_OUTPUTS = SFP_F_TX_DISABLE | SFP_F_RS0 | SFP_F_RS1, 39 40 SFP_E_INSERT = 0, 41 SFP_E_REMOVE, 42 SFP_E_DEV_ATTACH, 43 SFP_E_DEV_DETACH, 44 SFP_E_DEV_DOWN, 45 SFP_E_DEV_UP, 46 SFP_E_TX_FAULT, 47 SFP_E_TX_CLEAR, 48 SFP_E_LOS_HIGH, 49 SFP_E_LOS_LOW, 50 SFP_E_TIMEOUT, 51 52 SFP_MOD_EMPTY = 0, 53 SFP_MOD_ERROR, 54 SFP_MOD_PROBE, 55 SFP_MOD_WAITDEV, 56 SFP_MOD_HPOWER, 57 SFP_MOD_WAITPWR, 58 SFP_MOD_PRESENT, 59 60 SFP_DEV_DETACHED = 0, 61 SFP_DEV_DOWN, 62 SFP_DEV_UP, 63 64 SFP_S_DOWN = 0, 65 SFP_S_FAIL, 66 SFP_S_WAIT, 67 SFP_S_INIT, 68 SFP_S_INIT_PHY, 69 SFP_S_INIT_TX_FAULT, 70 SFP_S_WAIT_LOS, 71 SFP_S_LINK_UP, 72 SFP_S_TX_FAULT, 73 SFP_S_REINIT, 74 SFP_S_TX_DISABLE, 75 }; 76 77 static const char * const mod_state_strings[] = { 78 [SFP_MOD_EMPTY] = "empty", 79 [SFP_MOD_ERROR] = "error", 80 [SFP_MOD_PROBE] = "probe", 81 [SFP_MOD_WAITDEV] = "waitdev", 82 [SFP_MOD_HPOWER] = "hpower", 83 [SFP_MOD_WAITPWR] = "waitpwr", 84 [SFP_MOD_PRESENT] = "present", 85 }; 86 87 static const char *mod_state_to_str(unsigned short mod_state) 88 { 89 if (mod_state >= ARRAY_SIZE(mod_state_strings)) 90 return "Unknown module state"; 91 return mod_state_strings[mod_state]; 92 } 93 94 static const char * const dev_state_strings[] = { 95 [SFP_DEV_DETACHED] = "detached", 96 [SFP_DEV_DOWN] = "down", 97 [SFP_DEV_UP] = "up", 98 }; 99 100 static const char *dev_state_to_str(unsigned short dev_state) 101 { 102 if (dev_state >= ARRAY_SIZE(dev_state_strings)) 103 return "Unknown device state"; 104 return dev_state_strings[dev_state]; 105 } 106 107 static const char * const event_strings[] = { 108 [SFP_E_INSERT] = "insert", 109 [SFP_E_REMOVE] = "remove", 110 [SFP_E_DEV_ATTACH] = "dev_attach", 111 [SFP_E_DEV_DETACH] = "dev_detach", 112 [SFP_E_DEV_DOWN] = "dev_down", 113 [SFP_E_DEV_UP] = "dev_up", 114 [SFP_E_TX_FAULT] = "tx_fault", 115 [SFP_E_TX_CLEAR] = "tx_clear", 116 [SFP_E_LOS_HIGH] = "los_high", 117 [SFP_E_LOS_LOW] = "los_low", 118 [SFP_E_TIMEOUT] = "timeout", 119 }; 120 121 static const char *event_to_str(unsigned short event) 122 { 123 if (event >= ARRAY_SIZE(event_strings)) 124 return "Unknown event"; 125 return event_strings[event]; 126 } 127 128 static const char * const sm_state_strings[] = { 129 [SFP_S_DOWN] = "down", 130 [SFP_S_FAIL] = "fail", 131 [SFP_S_WAIT] = "wait", 132 [SFP_S_INIT] = "init", 133 [SFP_S_INIT_PHY] = "init_phy", 134 [SFP_S_INIT_TX_FAULT] = "init_tx_fault", 135 [SFP_S_WAIT_LOS] = "wait_los", 136 [SFP_S_LINK_UP] = "link_up", 137 [SFP_S_TX_FAULT] = "tx_fault", 138 [SFP_S_REINIT] = "reinit", 139 [SFP_S_TX_DISABLE] = "tx_disable", 140 }; 141 142 static const char *sm_state_to_str(unsigned short sm_state) 143 { 144 if (sm_state >= ARRAY_SIZE(sm_state_strings)) 145 return "Unknown state"; 146 return sm_state_strings[sm_state]; 147 } 148 149 static const char *gpio_names[] = { 150 "mod-def0", 151 "los", 152 "tx-fault", 153 "tx-disable", 154 "rate-select0", 155 "rate-select1", 156 }; 157 158 static const enum gpiod_flags gpio_flags[] = { 159 GPIOD_IN, 160 GPIOD_IN, 161 GPIOD_IN, 162 GPIOD_ASIS, 163 GPIOD_ASIS, 164 GPIOD_ASIS, 165 }; 166 167 /* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a 168 * non-cooled module to initialise its laser safety circuitry. We wait 169 * an initial T_WAIT period before we check the tx fault to give any PHY 170 * on board (for a copper SFP) time to initialise. 171 */ 172 #define T_WAIT msecs_to_jiffies(50) 173 #define T_START_UP msecs_to_jiffies(300) 174 #define T_START_UP_BAD_GPON msecs_to_jiffies(60000) 175 176 /* t_reset is the time required to assert the TX_DISABLE signal to reset 177 * an indicated TX_FAULT. 178 */ 179 #define T_RESET_US 10 180 #define T_FAULT_RECOVER msecs_to_jiffies(1000) 181 182 /* N_FAULT_INIT is the number of recovery attempts at module initialisation 183 * time. If the TX_FAULT signal is not deasserted after this number of 184 * attempts at clearing it, we decide that the module is faulty. 185 * N_FAULT is the same but after the module has initialised. 186 */ 187 #define N_FAULT_INIT 5 188 #define N_FAULT 5 189 190 /* T_PHY_RETRY is the time interval between attempts to probe the PHY. 191 * R_PHY_RETRY is the number of attempts. 192 */ 193 #define T_PHY_RETRY msecs_to_jiffies(50) 194 #define R_PHY_RETRY 25 195 196 /* SFP module presence detection is poor: the three MOD DEF signals are 197 * the same length on the PCB, which means it's possible for MOD DEF 0 to 198 * connect before the I2C bus on MOD DEF 1/2. 199 * 200 * The SFF-8472 specifies t_serial ("Time from power on until module is 201 * ready for data transmission over the two wire serial bus.") as 300ms. 202 */ 203 #define T_SERIAL msecs_to_jiffies(300) 204 #define T_HPOWER_LEVEL msecs_to_jiffies(300) 205 #define T_PROBE_RETRY_INIT msecs_to_jiffies(100) 206 #define R_PROBE_RETRY_INIT 10 207 #define T_PROBE_RETRY_SLOW msecs_to_jiffies(5000) 208 #define R_PROBE_RETRY_SLOW 12 209 210 /* SFP modules appear to always have their PHY configured for bus address 211 * 0x56 (which with mdio-i2c, translates to a PHY address of 22). 212 * RollBall SFPs access phy via SFP Enhanced Digital Diagnostic Interface 213 * via address 0x51 (mdio-i2c will use RollBall protocol on this address). 214 */ 215 #define SFP_PHY_ADDR 22 216 #define SFP_PHY_ADDR_ROLLBALL 17 217 218 /* SFP_EEPROM_BLOCK_SIZE is the size of data chunk to read the EEPROM 219 * at a time. Some SFP modules and also some Linux I2C drivers do not like 220 * reads longer than 16 bytes. 221 */ 222 #define SFP_EEPROM_BLOCK_SIZE 16 223 224 struct sff_data { 225 unsigned int gpios; 226 bool (*module_supported)(const struct sfp_eeprom_id *id); 227 }; 228 229 struct sfp { 230 struct device *dev; 231 struct i2c_adapter *i2c; 232 struct mii_bus *i2c_mii; 233 struct sfp_bus *sfp_bus; 234 enum mdio_i2c_proto mdio_protocol; 235 struct phy_device *mod_phy; 236 const struct sff_data *type; 237 size_t i2c_block_size; 238 u32 max_power_mW; 239 240 unsigned int (*get_state)(struct sfp *); 241 void (*set_state)(struct sfp *, unsigned int); 242 int (*read)(struct sfp *, bool, u8, void *, size_t); 243 int (*write)(struct sfp *, bool, u8, void *, size_t); 244 245 struct gpio_desc *gpio[GPIO_MAX]; 246 int gpio_irq[GPIO_MAX]; 247 248 bool need_poll; 249 250 /* Access rules: 251 * state_hw_drive: st_mutex held 252 * state_hw_mask: st_mutex held 253 * state_soft_mask: st_mutex held 254 * state: st_mutex held unless reading input bits 255 */ 256 struct mutex st_mutex; /* Protects state */ 257 unsigned int state_hw_drive; 258 unsigned int state_hw_mask; 259 unsigned int state_soft_mask; 260 unsigned int state_ignore_mask; 261 unsigned int state; 262 263 struct delayed_work poll; 264 struct delayed_work timeout; 265 struct mutex sm_mutex; /* Protects state machine */ 266 unsigned char sm_mod_state; 267 unsigned char sm_mod_tries_init; 268 unsigned char sm_mod_tries; 269 unsigned char sm_dev_state; 270 unsigned short sm_state; 271 unsigned char sm_fault_retries; 272 unsigned char sm_phy_retries; 273 274 struct sfp_eeprom_id id; 275 unsigned int module_power_mW; 276 unsigned int module_t_start_up; 277 unsigned int module_t_wait; 278 unsigned int phy_t_retry; 279 280 unsigned int rate_kbd; 281 unsigned int rs_threshold_kbd; 282 unsigned int rs_state_mask; 283 284 bool have_a2; 285 286 const struct sfp_quirk *quirk; 287 288 #if IS_ENABLED(CONFIG_HWMON) 289 struct sfp_diag diag; 290 struct delayed_work hwmon_probe; 291 unsigned int hwmon_tries; 292 struct device *hwmon_dev; 293 char *hwmon_name; 294 #endif 295 296 #if IS_ENABLED(CONFIG_DEBUG_FS) 297 struct dentry *debugfs_dir; 298 #endif 299 }; 300 301 static bool sff_module_supported(const struct sfp_eeprom_id *id) 302 { 303 return id->base.phys_id == SFF8024_ID_SFF_8472 && 304 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP; 305 } 306 307 static const struct sff_data sff_data = { 308 .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE, 309 .module_supported = sff_module_supported, 310 }; 311 312 static bool sfp_module_supported(const struct sfp_eeprom_id *id) 313 { 314 if (id->base.phys_id == SFF8024_ID_SFP && 315 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP) 316 return true; 317 318 /* SFP GPON module Ubiquiti U-Fiber Instant has in its EEPROM stored 319 * phys id SFF instead of SFP. Therefore mark this module explicitly 320 * as supported based on vendor name and pn match. 321 */ 322 if (id->base.phys_id == SFF8024_ID_SFF_8472 && 323 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP && 324 !memcmp(id->base.vendor_name, "UBNT ", 16) && 325 !memcmp(id->base.vendor_pn, "UF-INSTANT ", 16)) 326 return true; 327 328 return false; 329 } 330 331 static const struct sff_data sfp_data = { 332 .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT | 333 SFP_F_TX_DISABLE | SFP_F_RS0 | SFP_F_RS1, 334 .module_supported = sfp_module_supported, 335 }; 336 337 static const struct of_device_id sfp_of_match[] = { 338 { .compatible = "sff,sff", .data = &sff_data, }, 339 { .compatible = "sff,sfp", .data = &sfp_data, }, 340 { }, 341 }; 342 MODULE_DEVICE_TABLE(of, sfp_of_match); 343 344 static void sfp_fixup_long_startup(struct sfp *sfp) 345 { 346 sfp->module_t_start_up = T_START_UP_BAD_GPON; 347 } 348 349 static void sfp_fixup_ignore_los(struct sfp *sfp) 350 { 351 /* This forces LOS to zero, so we ignore transitions */ 352 sfp->state_ignore_mask |= SFP_F_LOS; 353 /* Make sure that LOS options are clear */ 354 sfp->id.ext.options &= ~cpu_to_be16(SFP_OPTIONS_LOS_INVERTED | 355 SFP_OPTIONS_LOS_NORMAL); 356 } 357 358 static void sfp_fixup_ignore_tx_fault(struct sfp *sfp) 359 { 360 sfp->state_ignore_mask |= SFP_F_TX_FAULT; 361 } 362 363 static void sfp_fixup_nokia(struct sfp *sfp) 364 { 365 sfp_fixup_long_startup(sfp); 366 sfp_fixup_ignore_los(sfp); 367 } 368 369 // For 10GBASE-T short-reach modules 370 static void sfp_fixup_10gbaset_30m(struct sfp *sfp) 371 { 372 sfp->id.base.connector = SFF8024_CONNECTOR_RJ45; 373 sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SR; 374 } 375 376 static void sfp_fixup_rollball(struct sfp *sfp) 377 { 378 sfp->mdio_protocol = MDIO_I2C_ROLLBALL; 379 380 /* RollBall modules may disallow access to PHY registers for up to 25 381 * seconds, and the reads return 0xffff before that. Increase the time 382 * between PHY probe retries from 50ms to 1s so that we will wait for 383 * the PHY for a sufficient amount of time. 384 */ 385 sfp->phy_t_retry = msecs_to_jiffies(1000); 386 } 387 388 static void sfp_fixup_fs_2_5gt(struct sfp *sfp) 389 { 390 sfp_fixup_rollball(sfp); 391 392 /* The RollBall fixup is not enough for FS modules, the PHY chip inside 393 * them does not return 0xffff for PHY ID registers in all MMDs for the 394 * while initializing. They need a 4 second wait before accessing PHY. 395 */ 396 sfp->module_t_wait = msecs_to_jiffies(4000); 397 } 398 399 static void sfp_fixup_fs_10gt(struct sfp *sfp) 400 { 401 sfp_fixup_10gbaset_30m(sfp); 402 sfp_fixup_fs_2_5gt(sfp); 403 } 404 405 static void sfp_fixup_halny_gsfp(struct sfp *sfp) 406 { 407 /* Ignore the TX_FAULT and LOS signals on this module. 408 * these are possibly used for other purposes on this 409 * module, e.g. a serial port. 410 */ 411 sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS); 412 } 413 414 static void sfp_fixup_rollball_cc(struct sfp *sfp) 415 { 416 sfp_fixup_rollball(sfp); 417 418 /* Some RollBall SFPs may have wrong (zero) extended compliance code 419 * burned in EEPROM. For PHY probing we need the correct one. 420 */ 421 sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SFI; 422 } 423 424 static void sfp_quirk_2500basex(const struct sfp_eeprom_id *id, 425 unsigned long *modes, 426 unsigned long *interfaces) 427 { 428 linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, modes); 429 __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces); 430 } 431 432 static void sfp_quirk_disable_autoneg(const struct sfp_eeprom_id *id, 433 unsigned long *modes, 434 unsigned long *interfaces) 435 { 436 linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, modes); 437 } 438 439 static void sfp_quirk_oem_2_5g(const struct sfp_eeprom_id *id, 440 unsigned long *modes, 441 unsigned long *interfaces) 442 { 443 /* Copper 2.5G SFP */ 444 linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, modes); 445 __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces); 446 sfp_quirk_disable_autoneg(id, modes, interfaces); 447 } 448 449 static void sfp_quirk_ubnt_uf_instant(const struct sfp_eeprom_id *id, 450 unsigned long *modes, 451 unsigned long *interfaces) 452 { 453 /* Ubiquiti U-Fiber Instant module claims that support all transceiver 454 * types including 10G Ethernet which is not truth. So clear all claimed 455 * modes and set only one mode which module supports: 1000baseX_Full. 456 */ 457 linkmode_zero(modes); 458 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, modes); 459 } 460 461 #define SFP_QUIRK(_v, _p, _m, _f) \ 462 { .vendor = _v, .part = _p, .modes = _m, .fixup = _f, } 463 #define SFP_QUIRK_M(_v, _p, _m) SFP_QUIRK(_v, _p, _m, NULL) 464 #define SFP_QUIRK_F(_v, _p, _f) SFP_QUIRK(_v, _p, NULL, _f) 465 466 static const struct sfp_quirk sfp_quirks[] = { 467 // Alcatel Lucent G-010S-P can operate at 2500base-X, but incorrectly 468 // report 2500MBd NRZ in their EEPROM 469 SFP_QUIRK("ALCATELLUCENT", "G010SP", sfp_quirk_2500basex, 470 sfp_fixup_ignore_tx_fault), 471 472 // Alcatel Lucent G-010S-A can operate at 2500base-X, but report 3.2GBd 473 // NRZ in their EEPROM 474 SFP_QUIRK("ALCATELLUCENT", "3FE46541AA", sfp_quirk_2500basex, 475 sfp_fixup_nokia), 476 477 // Fiberstore SFP-10G-T doesn't identify as copper, uses the Rollball 478 // protocol to talk to the PHY and needs 4 sec wait before probing the 479 // PHY. 480 SFP_QUIRK_F("FS", "SFP-10G-T", sfp_fixup_fs_10gt), 481 482 // Fiberstore SFP-2.5G-T uses Rollball protocol to talk to the PHY and 483 // needs 4 sec wait before probing the PHY. 484 SFP_QUIRK_F("FS", "SFP-2.5G-T", sfp_fixup_fs_2_5gt), 485 486 // Fiberstore GPON-ONU-34-20BI can operate at 2500base-X, but report 1.2GBd 487 // NRZ in their EEPROM 488 SFP_QUIRK("FS", "GPON-ONU-34-20BI", sfp_quirk_2500basex, 489 sfp_fixup_ignore_tx_fault), 490 491 SFP_QUIRK_F("HALNy", "HL-GSFP", sfp_fixup_halny_gsfp), 492 493 // HG MXPD-483II-F 2.5G supports 2500Base-X, but incorrectly reports 494 // 2600MBd in their EERPOM 495 SFP_QUIRK_M("HG GENUINE", "MXPD-483II", sfp_quirk_2500basex), 496 497 // Huawei MA5671A can operate at 2500base-X, but report 1.2GBd NRZ in 498 // their EEPROM 499 SFP_QUIRK("HUAWEI", "MA5671A", sfp_quirk_2500basex, 500 sfp_fixup_ignore_tx_fault), 501 502 // Lantech 8330-262D-E can operate at 2500base-X, but incorrectly report 503 // 2500MBd NRZ in their EEPROM 504 SFP_QUIRK_M("Lantech", "8330-262D-E", sfp_quirk_2500basex), 505 506 SFP_QUIRK_M("UBNT", "UF-INSTANT", sfp_quirk_ubnt_uf_instant), 507 508 // Walsun HXSX-ATR[CI]-1 don't identify as copper, and use the 509 // Rollball protocol to talk to the PHY. 510 SFP_QUIRK_F("Walsun", "HXSX-ATRC-1", sfp_fixup_fs_10gt), 511 SFP_QUIRK_F("Walsun", "HXSX-ATRI-1", sfp_fixup_fs_10gt), 512 513 // OEM SFP-GE-T is a 1000Base-T module with broken TX_FAULT indicator 514 SFP_QUIRK_F("OEM", "SFP-GE-T", sfp_fixup_ignore_tx_fault), 515 516 SFP_QUIRK_F("OEM", "SFP-10G-T", sfp_fixup_rollball_cc), 517 SFP_QUIRK_M("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g), 518 SFP_QUIRK_M("OEM", "SFP-2.5G-BX10-D", sfp_quirk_2500basex), 519 SFP_QUIRK_M("OEM", "SFP-2.5G-BX10-U", sfp_quirk_2500basex), 520 SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc), 521 SFP_QUIRK_F("OEM", "RTSFP-10G", sfp_fixup_rollball_cc), 522 SFP_QUIRK_F("Turris", "RTSFP-2.5G", sfp_fixup_rollball), 523 SFP_QUIRK_F("Turris", "RTSFP-10", sfp_fixup_rollball), 524 SFP_QUIRK_F("Turris", "RTSFP-10G", sfp_fixup_rollball), 525 }; 526 527 static size_t sfp_strlen(const char *str, size_t maxlen) 528 { 529 size_t size, i; 530 531 /* Trailing characters should be filled with space chars, but 532 * some manufacturers can't read SFF-8472 and use NUL. 533 */ 534 for (i = 0, size = 0; i < maxlen; i++) 535 if (str[i] != ' ' && str[i] != '\0') 536 size = i + 1; 537 538 return size; 539 } 540 541 static bool sfp_match(const char *qs, const char *str, size_t len) 542 { 543 if (!qs) 544 return true; 545 if (strlen(qs) != len) 546 return false; 547 return !strncmp(qs, str, len); 548 } 549 550 static const struct sfp_quirk *sfp_lookup_quirk(const struct sfp_eeprom_id *id) 551 { 552 const struct sfp_quirk *q; 553 unsigned int i; 554 size_t vs, ps; 555 556 vs = sfp_strlen(id->base.vendor_name, ARRAY_SIZE(id->base.vendor_name)); 557 ps = sfp_strlen(id->base.vendor_pn, ARRAY_SIZE(id->base.vendor_pn)); 558 559 for (i = 0, q = sfp_quirks; i < ARRAY_SIZE(sfp_quirks); i++, q++) 560 if (sfp_match(q->vendor, id->base.vendor_name, vs) && 561 sfp_match(q->part, id->base.vendor_pn, ps)) 562 return q; 563 564 return NULL; 565 } 566 567 static unsigned long poll_jiffies; 568 569 static unsigned int sfp_gpio_get_state(struct sfp *sfp) 570 { 571 unsigned int i, state, v; 572 573 for (i = state = 0; i < GPIO_MAX; i++) { 574 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i]) 575 continue; 576 577 v = gpiod_get_value_cansleep(sfp->gpio[i]); 578 if (v) 579 state |= BIT(i); 580 } 581 582 return state; 583 } 584 585 static unsigned int sff_gpio_get_state(struct sfp *sfp) 586 { 587 return sfp_gpio_get_state(sfp) | SFP_F_PRESENT; 588 } 589 590 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state) 591 { 592 unsigned int drive; 593 594 if (state & SFP_F_PRESENT) 595 /* If the module is present, drive the requested signals */ 596 drive = sfp->state_hw_drive; 597 else 598 /* Otherwise, let them float to the pull-ups */ 599 drive = 0; 600 601 if (sfp->gpio[GPIO_TX_DISABLE]) { 602 if (drive & SFP_F_TX_DISABLE) 603 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE], 604 state & SFP_F_TX_DISABLE); 605 else 606 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]); 607 } 608 609 if (sfp->gpio[GPIO_RS0]) { 610 if (drive & SFP_F_RS0) 611 gpiod_direction_output(sfp->gpio[GPIO_RS0], 612 state & SFP_F_RS0); 613 else 614 gpiod_direction_input(sfp->gpio[GPIO_RS0]); 615 } 616 617 if (sfp->gpio[GPIO_RS1]) { 618 if (drive & SFP_F_RS1) 619 gpiod_direction_output(sfp->gpio[GPIO_RS1], 620 state & SFP_F_RS1); 621 else 622 gpiod_direction_input(sfp->gpio[GPIO_RS1]); 623 } 624 } 625 626 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf, 627 size_t len) 628 { 629 struct i2c_msg msgs[2]; 630 u8 bus_addr = a2 ? 0x51 : 0x50; 631 size_t block_size = sfp->i2c_block_size; 632 size_t this_len; 633 int ret; 634 635 msgs[0].addr = bus_addr; 636 msgs[0].flags = 0; 637 msgs[0].len = 1; 638 msgs[0].buf = &dev_addr; 639 msgs[1].addr = bus_addr; 640 msgs[1].flags = I2C_M_RD; 641 msgs[1].len = len; 642 msgs[1].buf = buf; 643 644 while (len) { 645 this_len = len; 646 if (this_len > block_size) 647 this_len = block_size; 648 649 msgs[1].len = this_len; 650 651 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs)); 652 if (ret < 0) 653 return ret; 654 655 if (ret != ARRAY_SIZE(msgs)) 656 break; 657 658 msgs[1].buf += this_len; 659 dev_addr += this_len; 660 len -= this_len; 661 } 662 663 return msgs[1].buf - (u8 *)buf; 664 } 665 666 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf, 667 size_t len) 668 { 669 struct i2c_msg msgs[1]; 670 u8 bus_addr = a2 ? 0x51 : 0x50; 671 int ret; 672 673 msgs[0].addr = bus_addr; 674 msgs[0].flags = 0; 675 msgs[0].len = 1 + len; 676 msgs[0].buf = kmalloc(1 + len, GFP_KERNEL); 677 if (!msgs[0].buf) 678 return -ENOMEM; 679 680 msgs[0].buf[0] = dev_addr; 681 memcpy(&msgs[0].buf[1], buf, len); 682 683 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs)); 684 685 kfree(msgs[0].buf); 686 687 if (ret < 0) 688 return ret; 689 690 return ret == ARRAY_SIZE(msgs) ? len : 0; 691 } 692 693 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c) 694 { 695 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C)) 696 return -EINVAL; 697 698 sfp->i2c = i2c; 699 sfp->read = sfp_i2c_read; 700 sfp->write = sfp_i2c_write; 701 702 return 0; 703 } 704 705 static int sfp_i2c_mdiobus_create(struct sfp *sfp) 706 { 707 struct mii_bus *i2c_mii; 708 int ret; 709 710 i2c_mii = mdio_i2c_alloc(sfp->dev, sfp->i2c, sfp->mdio_protocol); 711 if (IS_ERR(i2c_mii)) 712 return PTR_ERR(i2c_mii); 713 714 i2c_mii->name = "SFP I2C Bus"; 715 i2c_mii->phy_mask = ~0; 716 717 ret = mdiobus_register(i2c_mii); 718 if (ret < 0) { 719 mdiobus_free(i2c_mii); 720 return ret; 721 } 722 723 sfp->i2c_mii = i2c_mii; 724 725 return 0; 726 } 727 728 static void sfp_i2c_mdiobus_destroy(struct sfp *sfp) 729 { 730 mdiobus_unregister(sfp->i2c_mii); 731 sfp->i2c_mii = NULL; 732 } 733 734 /* Interface */ 735 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len) 736 { 737 return sfp->read(sfp, a2, addr, buf, len); 738 } 739 740 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len) 741 { 742 return sfp->write(sfp, a2, addr, buf, len); 743 } 744 745 static int sfp_modify_u8(struct sfp *sfp, bool a2, u8 addr, u8 mask, u8 val) 746 { 747 int ret; 748 u8 old, v; 749 750 ret = sfp_read(sfp, a2, addr, &old, sizeof(old)); 751 if (ret != sizeof(old)) 752 return ret; 753 754 v = (old & ~mask) | (val & mask); 755 if (v == old) 756 return sizeof(v); 757 758 return sfp_write(sfp, a2, addr, &v, sizeof(v)); 759 } 760 761 static unsigned int sfp_soft_get_state(struct sfp *sfp) 762 { 763 unsigned int state = 0; 764 u8 status; 765 int ret; 766 767 ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)); 768 if (ret == sizeof(status)) { 769 if (status & SFP_STATUS_RX_LOS) 770 state |= SFP_F_LOS; 771 if (status & SFP_STATUS_TX_FAULT) 772 state |= SFP_F_TX_FAULT; 773 } else { 774 dev_err_ratelimited(sfp->dev, 775 "failed to read SFP soft status: %pe\n", 776 ERR_PTR(ret)); 777 /* Preserve the current state */ 778 state = sfp->state; 779 } 780 781 return state & sfp->state_soft_mask; 782 } 783 784 static void sfp_soft_set_state(struct sfp *sfp, unsigned int state, 785 unsigned int soft) 786 { 787 u8 mask = 0; 788 u8 val = 0; 789 790 if (soft & SFP_F_TX_DISABLE) 791 mask |= SFP_STATUS_TX_DISABLE_FORCE; 792 if (state & SFP_F_TX_DISABLE) 793 val |= SFP_STATUS_TX_DISABLE_FORCE; 794 795 if (soft & SFP_F_RS0) 796 mask |= SFP_STATUS_RS0_SELECT; 797 if (state & SFP_F_RS0) 798 val |= SFP_STATUS_RS0_SELECT; 799 800 if (mask) 801 sfp_modify_u8(sfp, true, SFP_STATUS, mask, val); 802 803 val = mask = 0; 804 if (soft & SFP_F_RS1) 805 mask |= SFP_EXT_STATUS_RS1_SELECT; 806 if (state & SFP_F_RS1) 807 val |= SFP_EXT_STATUS_RS1_SELECT; 808 809 if (mask) 810 sfp_modify_u8(sfp, true, SFP_EXT_STATUS, mask, val); 811 } 812 813 static void sfp_soft_start_poll(struct sfp *sfp) 814 { 815 const struct sfp_eeprom_id *id = &sfp->id; 816 unsigned int mask = 0; 817 818 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE) 819 mask |= SFP_F_TX_DISABLE; 820 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT) 821 mask |= SFP_F_TX_FAULT; 822 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS) 823 mask |= SFP_F_LOS; 824 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RATE_SELECT) 825 mask |= sfp->rs_state_mask; 826 827 mutex_lock(&sfp->st_mutex); 828 // Poll the soft state for hardware pins we want to ignore 829 sfp->state_soft_mask = ~sfp->state_hw_mask & ~sfp->state_ignore_mask & 830 mask; 831 832 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) && 833 !sfp->need_poll) 834 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 835 mutex_unlock(&sfp->st_mutex); 836 } 837 838 static void sfp_soft_stop_poll(struct sfp *sfp) 839 { 840 mutex_lock(&sfp->st_mutex); 841 sfp->state_soft_mask = 0; 842 mutex_unlock(&sfp->st_mutex); 843 } 844 845 /* sfp_get_state() - must be called with st_mutex held, or in the 846 * initialisation path. 847 */ 848 static unsigned int sfp_get_state(struct sfp *sfp) 849 { 850 unsigned int soft = sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT); 851 unsigned int state; 852 853 state = sfp->get_state(sfp) & sfp->state_hw_mask; 854 if (state & SFP_F_PRESENT && soft) 855 state |= sfp_soft_get_state(sfp); 856 857 return state; 858 } 859 860 /* sfp_set_state() - must be called with st_mutex held, or in the 861 * initialisation path. 862 */ 863 static void sfp_set_state(struct sfp *sfp, unsigned int state) 864 { 865 unsigned int soft; 866 867 sfp->set_state(sfp, state); 868 869 soft = sfp->state_soft_mask & SFP_F_OUTPUTS; 870 if (state & SFP_F_PRESENT && soft) 871 sfp_soft_set_state(sfp, state, soft); 872 } 873 874 static void sfp_mod_state(struct sfp *sfp, unsigned int mask, unsigned int set) 875 { 876 mutex_lock(&sfp->st_mutex); 877 sfp->state = (sfp->state & ~mask) | set; 878 sfp_set_state(sfp, sfp->state); 879 mutex_unlock(&sfp->st_mutex); 880 } 881 882 static unsigned int sfp_check(void *buf, size_t len) 883 { 884 u8 *p, check; 885 886 for (p = buf, check = 0; len; p++, len--) 887 check += *p; 888 889 return check; 890 } 891 892 /* hwmon */ 893 #if IS_ENABLED(CONFIG_HWMON) 894 static umode_t sfp_hwmon_is_visible(const void *data, 895 enum hwmon_sensor_types type, 896 u32 attr, int channel) 897 { 898 const struct sfp *sfp = data; 899 900 switch (type) { 901 case hwmon_temp: 902 switch (attr) { 903 case hwmon_temp_min_alarm: 904 case hwmon_temp_max_alarm: 905 case hwmon_temp_lcrit_alarm: 906 case hwmon_temp_crit_alarm: 907 case hwmon_temp_min: 908 case hwmon_temp_max: 909 case hwmon_temp_lcrit: 910 case hwmon_temp_crit: 911 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 912 return 0; 913 fallthrough; 914 case hwmon_temp_input: 915 case hwmon_temp_label: 916 return 0444; 917 default: 918 return 0; 919 } 920 case hwmon_in: 921 switch (attr) { 922 case hwmon_in_min_alarm: 923 case hwmon_in_max_alarm: 924 case hwmon_in_lcrit_alarm: 925 case hwmon_in_crit_alarm: 926 case hwmon_in_min: 927 case hwmon_in_max: 928 case hwmon_in_lcrit: 929 case hwmon_in_crit: 930 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 931 return 0; 932 fallthrough; 933 case hwmon_in_input: 934 case hwmon_in_label: 935 return 0444; 936 default: 937 return 0; 938 } 939 case hwmon_curr: 940 switch (attr) { 941 case hwmon_curr_min_alarm: 942 case hwmon_curr_max_alarm: 943 case hwmon_curr_lcrit_alarm: 944 case hwmon_curr_crit_alarm: 945 case hwmon_curr_min: 946 case hwmon_curr_max: 947 case hwmon_curr_lcrit: 948 case hwmon_curr_crit: 949 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 950 return 0; 951 fallthrough; 952 case hwmon_curr_input: 953 case hwmon_curr_label: 954 return 0444; 955 default: 956 return 0; 957 } 958 case hwmon_power: 959 /* External calibration of receive power requires 960 * floating point arithmetic. Doing that in the kernel 961 * is not easy, so just skip it. If the module does 962 * not require external calibration, we can however 963 * show receiver power, since FP is then not needed. 964 */ 965 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL && 966 channel == 1) 967 return 0; 968 switch (attr) { 969 case hwmon_power_min_alarm: 970 case hwmon_power_max_alarm: 971 case hwmon_power_lcrit_alarm: 972 case hwmon_power_crit_alarm: 973 case hwmon_power_min: 974 case hwmon_power_max: 975 case hwmon_power_lcrit: 976 case hwmon_power_crit: 977 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN)) 978 return 0; 979 fallthrough; 980 case hwmon_power_input: 981 case hwmon_power_label: 982 return 0444; 983 default: 984 return 0; 985 } 986 default: 987 return 0; 988 } 989 } 990 991 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value) 992 { 993 __be16 val; 994 int err; 995 996 err = sfp_read(sfp, true, reg, &val, sizeof(val)); 997 if (err < 0) 998 return err; 999 1000 *value = be16_to_cpu(val); 1001 1002 return 0; 1003 } 1004 1005 static void sfp_hwmon_to_rx_power(long *value) 1006 { 1007 *value = DIV_ROUND_CLOSEST(*value, 10); 1008 } 1009 1010 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset, 1011 long *value) 1012 { 1013 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL) 1014 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset; 1015 } 1016 1017 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value) 1018 { 1019 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope), 1020 be16_to_cpu(sfp->diag.cal_t_offset), value); 1021 1022 if (*value >= 0x8000) 1023 *value -= 0x10000; 1024 1025 *value = DIV_ROUND_CLOSEST(*value * 1000, 256); 1026 } 1027 1028 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value) 1029 { 1030 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope), 1031 be16_to_cpu(sfp->diag.cal_v_offset), value); 1032 1033 *value = DIV_ROUND_CLOSEST(*value, 10); 1034 } 1035 1036 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value) 1037 { 1038 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope), 1039 be16_to_cpu(sfp->diag.cal_txi_offset), value); 1040 1041 *value = DIV_ROUND_CLOSEST(*value, 500); 1042 } 1043 1044 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value) 1045 { 1046 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope), 1047 be16_to_cpu(sfp->diag.cal_txpwr_offset), value); 1048 1049 *value = DIV_ROUND_CLOSEST(*value, 10); 1050 } 1051 1052 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value) 1053 { 1054 int err; 1055 1056 err = sfp_hwmon_read_sensor(sfp, reg, value); 1057 if (err < 0) 1058 return err; 1059 1060 sfp_hwmon_calibrate_temp(sfp, value); 1061 1062 return 0; 1063 } 1064 1065 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value) 1066 { 1067 int err; 1068 1069 err = sfp_hwmon_read_sensor(sfp, reg, value); 1070 if (err < 0) 1071 return err; 1072 1073 sfp_hwmon_calibrate_vcc(sfp, value); 1074 1075 return 0; 1076 } 1077 1078 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value) 1079 { 1080 int err; 1081 1082 err = sfp_hwmon_read_sensor(sfp, reg, value); 1083 if (err < 0) 1084 return err; 1085 1086 sfp_hwmon_calibrate_bias(sfp, value); 1087 1088 return 0; 1089 } 1090 1091 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value) 1092 { 1093 int err; 1094 1095 err = sfp_hwmon_read_sensor(sfp, reg, value); 1096 if (err < 0) 1097 return err; 1098 1099 sfp_hwmon_calibrate_tx_power(sfp, value); 1100 1101 return 0; 1102 } 1103 1104 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value) 1105 { 1106 int err; 1107 1108 err = sfp_hwmon_read_sensor(sfp, reg, value); 1109 if (err < 0) 1110 return err; 1111 1112 sfp_hwmon_to_rx_power(value); 1113 1114 return 0; 1115 } 1116 1117 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value) 1118 { 1119 u8 status; 1120 int err; 1121 1122 switch (attr) { 1123 case hwmon_temp_input: 1124 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value); 1125 1126 case hwmon_temp_lcrit: 1127 *value = be16_to_cpu(sfp->diag.temp_low_alarm); 1128 sfp_hwmon_calibrate_temp(sfp, value); 1129 return 0; 1130 1131 case hwmon_temp_min: 1132 *value = be16_to_cpu(sfp->diag.temp_low_warn); 1133 sfp_hwmon_calibrate_temp(sfp, value); 1134 return 0; 1135 case hwmon_temp_max: 1136 *value = be16_to_cpu(sfp->diag.temp_high_warn); 1137 sfp_hwmon_calibrate_temp(sfp, value); 1138 return 0; 1139 1140 case hwmon_temp_crit: 1141 *value = be16_to_cpu(sfp->diag.temp_high_alarm); 1142 sfp_hwmon_calibrate_temp(sfp, value); 1143 return 0; 1144 1145 case hwmon_temp_lcrit_alarm: 1146 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1147 if (err < 0) 1148 return err; 1149 1150 *value = !!(status & SFP_ALARM0_TEMP_LOW); 1151 return 0; 1152 1153 case hwmon_temp_min_alarm: 1154 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1155 if (err < 0) 1156 return err; 1157 1158 *value = !!(status & SFP_WARN0_TEMP_LOW); 1159 return 0; 1160 1161 case hwmon_temp_max_alarm: 1162 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1163 if (err < 0) 1164 return err; 1165 1166 *value = !!(status & SFP_WARN0_TEMP_HIGH); 1167 return 0; 1168 1169 case hwmon_temp_crit_alarm: 1170 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1171 if (err < 0) 1172 return err; 1173 1174 *value = !!(status & SFP_ALARM0_TEMP_HIGH); 1175 return 0; 1176 default: 1177 return -EOPNOTSUPP; 1178 } 1179 1180 return -EOPNOTSUPP; 1181 } 1182 1183 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value) 1184 { 1185 u8 status; 1186 int err; 1187 1188 switch (attr) { 1189 case hwmon_in_input: 1190 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value); 1191 1192 case hwmon_in_lcrit: 1193 *value = be16_to_cpu(sfp->diag.volt_low_alarm); 1194 sfp_hwmon_calibrate_vcc(sfp, value); 1195 return 0; 1196 1197 case hwmon_in_min: 1198 *value = be16_to_cpu(sfp->diag.volt_low_warn); 1199 sfp_hwmon_calibrate_vcc(sfp, value); 1200 return 0; 1201 1202 case hwmon_in_max: 1203 *value = be16_to_cpu(sfp->diag.volt_high_warn); 1204 sfp_hwmon_calibrate_vcc(sfp, value); 1205 return 0; 1206 1207 case hwmon_in_crit: 1208 *value = be16_to_cpu(sfp->diag.volt_high_alarm); 1209 sfp_hwmon_calibrate_vcc(sfp, value); 1210 return 0; 1211 1212 case hwmon_in_lcrit_alarm: 1213 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1214 if (err < 0) 1215 return err; 1216 1217 *value = !!(status & SFP_ALARM0_VCC_LOW); 1218 return 0; 1219 1220 case hwmon_in_min_alarm: 1221 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1222 if (err < 0) 1223 return err; 1224 1225 *value = !!(status & SFP_WARN0_VCC_LOW); 1226 return 0; 1227 1228 case hwmon_in_max_alarm: 1229 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1230 if (err < 0) 1231 return err; 1232 1233 *value = !!(status & SFP_WARN0_VCC_HIGH); 1234 return 0; 1235 1236 case hwmon_in_crit_alarm: 1237 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1238 if (err < 0) 1239 return err; 1240 1241 *value = !!(status & SFP_ALARM0_VCC_HIGH); 1242 return 0; 1243 default: 1244 return -EOPNOTSUPP; 1245 } 1246 1247 return -EOPNOTSUPP; 1248 } 1249 1250 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value) 1251 { 1252 u8 status; 1253 int err; 1254 1255 switch (attr) { 1256 case hwmon_curr_input: 1257 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value); 1258 1259 case hwmon_curr_lcrit: 1260 *value = be16_to_cpu(sfp->diag.bias_low_alarm); 1261 sfp_hwmon_calibrate_bias(sfp, value); 1262 return 0; 1263 1264 case hwmon_curr_min: 1265 *value = be16_to_cpu(sfp->diag.bias_low_warn); 1266 sfp_hwmon_calibrate_bias(sfp, value); 1267 return 0; 1268 1269 case hwmon_curr_max: 1270 *value = be16_to_cpu(sfp->diag.bias_high_warn); 1271 sfp_hwmon_calibrate_bias(sfp, value); 1272 return 0; 1273 1274 case hwmon_curr_crit: 1275 *value = be16_to_cpu(sfp->diag.bias_high_alarm); 1276 sfp_hwmon_calibrate_bias(sfp, value); 1277 return 0; 1278 1279 case hwmon_curr_lcrit_alarm: 1280 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1281 if (err < 0) 1282 return err; 1283 1284 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW); 1285 return 0; 1286 1287 case hwmon_curr_min_alarm: 1288 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1289 if (err < 0) 1290 return err; 1291 1292 *value = !!(status & SFP_WARN0_TX_BIAS_LOW); 1293 return 0; 1294 1295 case hwmon_curr_max_alarm: 1296 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1297 if (err < 0) 1298 return err; 1299 1300 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH); 1301 return 0; 1302 1303 case hwmon_curr_crit_alarm: 1304 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1305 if (err < 0) 1306 return err; 1307 1308 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH); 1309 return 0; 1310 default: 1311 return -EOPNOTSUPP; 1312 } 1313 1314 return -EOPNOTSUPP; 1315 } 1316 1317 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value) 1318 { 1319 u8 status; 1320 int err; 1321 1322 switch (attr) { 1323 case hwmon_power_input: 1324 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value); 1325 1326 case hwmon_power_lcrit: 1327 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm); 1328 sfp_hwmon_calibrate_tx_power(sfp, value); 1329 return 0; 1330 1331 case hwmon_power_min: 1332 *value = be16_to_cpu(sfp->diag.txpwr_low_warn); 1333 sfp_hwmon_calibrate_tx_power(sfp, value); 1334 return 0; 1335 1336 case hwmon_power_max: 1337 *value = be16_to_cpu(sfp->diag.txpwr_high_warn); 1338 sfp_hwmon_calibrate_tx_power(sfp, value); 1339 return 0; 1340 1341 case hwmon_power_crit: 1342 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm); 1343 sfp_hwmon_calibrate_tx_power(sfp, value); 1344 return 0; 1345 1346 case hwmon_power_lcrit_alarm: 1347 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1348 if (err < 0) 1349 return err; 1350 1351 *value = !!(status & SFP_ALARM0_TXPWR_LOW); 1352 return 0; 1353 1354 case hwmon_power_min_alarm: 1355 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1356 if (err < 0) 1357 return err; 1358 1359 *value = !!(status & SFP_WARN0_TXPWR_LOW); 1360 return 0; 1361 1362 case hwmon_power_max_alarm: 1363 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status)); 1364 if (err < 0) 1365 return err; 1366 1367 *value = !!(status & SFP_WARN0_TXPWR_HIGH); 1368 return 0; 1369 1370 case hwmon_power_crit_alarm: 1371 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status)); 1372 if (err < 0) 1373 return err; 1374 1375 *value = !!(status & SFP_ALARM0_TXPWR_HIGH); 1376 return 0; 1377 default: 1378 return -EOPNOTSUPP; 1379 } 1380 1381 return -EOPNOTSUPP; 1382 } 1383 1384 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value) 1385 { 1386 u8 status; 1387 int err; 1388 1389 switch (attr) { 1390 case hwmon_power_input: 1391 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value); 1392 1393 case hwmon_power_lcrit: 1394 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm); 1395 sfp_hwmon_to_rx_power(value); 1396 return 0; 1397 1398 case hwmon_power_min: 1399 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn); 1400 sfp_hwmon_to_rx_power(value); 1401 return 0; 1402 1403 case hwmon_power_max: 1404 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn); 1405 sfp_hwmon_to_rx_power(value); 1406 return 0; 1407 1408 case hwmon_power_crit: 1409 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm); 1410 sfp_hwmon_to_rx_power(value); 1411 return 0; 1412 1413 case hwmon_power_lcrit_alarm: 1414 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status)); 1415 if (err < 0) 1416 return err; 1417 1418 *value = !!(status & SFP_ALARM1_RXPWR_LOW); 1419 return 0; 1420 1421 case hwmon_power_min_alarm: 1422 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status)); 1423 if (err < 0) 1424 return err; 1425 1426 *value = !!(status & SFP_WARN1_RXPWR_LOW); 1427 return 0; 1428 1429 case hwmon_power_max_alarm: 1430 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status)); 1431 if (err < 0) 1432 return err; 1433 1434 *value = !!(status & SFP_WARN1_RXPWR_HIGH); 1435 return 0; 1436 1437 case hwmon_power_crit_alarm: 1438 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status)); 1439 if (err < 0) 1440 return err; 1441 1442 *value = !!(status & SFP_ALARM1_RXPWR_HIGH); 1443 return 0; 1444 default: 1445 return -EOPNOTSUPP; 1446 } 1447 1448 return -EOPNOTSUPP; 1449 } 1450 1451 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type, 1452 u32 attr, int channel, long *value) 1453 { 1454 struct sfp *sfp = dev_get_drvdata(dev); 1455 1456 switch (type) { 1457 case hwmon_temp: 1458 return sfp_hwmon_temp(sfp, attr, value); 1459 case hwmon_in: 1460 return sfp_hwmon_vcc(sfp, attr, value); 1461 case hwmon_curr: 1462 return sfp_hwmon_bias(sfp, attr, value); 1463 case hwmon_power: 1464 switch (channel) { 1465 case 0: 1466 return sfp_hwmon_tx_power(sfp, attr, value); 1467 case 1: 1468 return sfp_hwmon_rx_power(sfp, attr, value); 1469 default: 1470 return -EOPNOTSUPP; 1471 } 1472 default: 1473 return -EOPNOTSUPP; 1474 } 1475 } 1476 1477 static const char *const sfp_hwmon_power_labels[] = { 1478 "TX_power", 1479 "RX_power", 1480 }; 1481 1482 static int sfp_hwmon_read_string(struct device *dev, 1483 enum hwmon_sensor_types type, 1484 u32 attr, int channel, const char **str) 1485 { 1486 switch (type) { 1487 case hwmon_curr: 1488 switch (attr) { 1489 case hwmon_curr_label: 1490 *str = "bias"; 1491 return 0; 1492 default: 1493 return -EOPNOTSUPP; 1494 } 1495 break; 1496 case hwmon_temp: 1497 switch (attr) { 1498 case hwmon_temp_label: 1499 *str = "temperature"; 1500 return 0; 1501 default: 1502 return -EOPNOTSUPP; 1503 } 1504 break; 1505 case hwmon_in: 1506 switch (attr) { 1507 case hwmon_in_label: 1508 *str = "VCC"; 1509 return 0; 1510 default: 1511 return -EOPNOTSUPP; 1512 } 1513 break; 1514 case hwmon_power: 1515 switch (attr) { 1516 case hwmon_power_label: 1517 *str = sfp_hwmon_power_labels[channel]; 1518 return 0; 1519 default: 1520 return -EOPNOTSUPP; 1521 } 1522 break; 1523 default: 1524 return -EOPNOTSUPP; 1525 } 1526 1527 return -EOPNOTSUPP; 1528 } 1529 1530 static const struct hwmon_ops sfp_hwmon_ops = { 1531 .is_visible = sfp_hwmon_is_visible, 1532 .read = sfp_hwmon_read, 1533 .read_string = sfp_hwmon_read_string, 1534 }; 1535 1536 static const struct hwmon_channel_info * const sfp_hwmon_info[] = { 1537 HWMON_CHANNEL_INFO(chip, 1538 HWMON_C_REGISTER_TZ), 1539 HWMON_CHANNEL_INFO(in, 1540 HWMON_I_INPUT | 1541 HWMON_I_MAX | HWMON_I_MIN | 1542 HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM | 1543 HWMON_I_CRIT | HWMON_I_LCRIT | 1544 HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM | 1545 HWMON_I_LABEL), 1546 HWMON_CHANNEL_INFO(temp, 1547 HWMON_T_INPUT | 1548 HWMON_T_MAX | HWMON_T_MIN | 1549 HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM | 1550 HWMON_T_CRIT | HWMON_T_LCRIT | 1551 HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM | 1552 HWMON_T_LABEL), 1553 HWMON_CHANNEL_INFO(curr, 1554 HWMON_C_INPUT | 1555 HWMON_C_MAX | HWMON_C_MIN | 1556 HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM | 1557 HWMON_C_CRIT | HWMON_C_LCRIT | 1558 HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM | 1559 HWMON_C_LABEL), 1560 HWMON_CHANNEL_INFO(power, 1561 /* Transmit power */ 1562 HWMON_P_INPUT | 1563 HWMON_P_MAX | HWMON_P_MIN | 1564 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM | 1565 HWMON_P_CRIT | HWMON_P_LCRIT | 1566 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM | 1567 HWMON_P_LABEL, 1568 /* Receive power */ 1569 HWMON_P_INPUT | 1570 HWMON_P_MAX | HWMON_P_MIN | 1571 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM | 1572 HWMON_P_CRIT | HWMON_P_LCRIT | 1573 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM | 1574 HWMON_P_LABEL), 1575 NULL, 1576 }; 1577 1578 static const struct hwmon_chip_info sfp_hwmon_chip_info = { 1579 .ops = &sfp_hwmon_ops, 1580 .info = sfp_hwmon_info, 1581 }; 1582 1583 static void sfp_hwmon_probe(struct work_struct *work) 1584 { 1585 struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work); 1586 int err; 1587 1588 /* hwmon interface needs to access 16bit registers in atomic way to 1589 * guarantee coherency of the diagnostic monitoring data. If it is not 1590 * possible to guarantee coherency because EEPROM is broken in such way 1591 * that does not support atomic 16bit read operation then we have to 1592 * skip registration of hwmon device. 1593 */ 1594 if (sfp->i2c_block_size < 2) { 1595 dev_info(sfp->dev, 1596 "skipping hwmon device registration due to broken EEPROM\n"); 1597 dev_info(sfp->dev, 1598 "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n"); 1599 return; 1600 } 1601 1602 err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag)); 1603 if (err < 0) { 1604 if (sfp->hwmon_tries--) { 1605 mod_delayed_work(system_wq, &sfp->hwmon_probe, 1606 T_PROBE_RETRY_SLOW); 1607 } else { 1608 dev_warn(sfp->dev, "hwmon probe failed: %pe\n", 1609 ERR_PTR(err)); 1610 } 1611 return; 1612 } 1613 1614 sfp->hwmon_name = hwmon_sanitize_name(dev_name(sfp->dev)); 1615 if (IS_ERR(sfp->hwmon_name)) { 1616 dev_err(sfp->dev, "out of memory for hwmon name\n"); 1617 return; 1618 } 1619 1620 sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev, 1621 sfp->hwmon_name, sfp, 1622 &sfp_hwmon_chip_info, 1623 NULL); 1624 if (IS_ERR(sfp->hwmon_dev)) 1625 dev_err(sfp->dev, "failed to register hwmon device: %ld\n", 1626 PTR_ERR(sfp->hwmon_dev)); 1627 } 1628 1629 static int sfp_hwmon_insert(struct sfp *sfp) 1630 { 1631 if (sfp->have_a2 && sfp->id.ext.diagmon & SFP_DIAGMON_DDM) { 1632 mod_delayed_work(system_wq, &sfp->hwmon_probe, 1); 1633 sfp->hwmon_tries = R_PROBE_RETRY_SLOW; 1634 } 1635 1636 return 0; 1637 } 1638 1639 static void sfp_hwmon_remove(struct sfp *sfp) 1640 { 1641 cancel_delayed_work_sync(&sfp->hwmon_probe); 1642 if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) { 1643 hwmon_device_unregister(sfp->hwmon_dev); 1644 sfp->hwmon_dev = NULL; 1645 kfree(sfp->hwmon_name); 1646 } 1647 } 1648 1649 static int sfp_hwmon_init(struct sfp *sfp) 1650 { 1651 INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe); 1652 1653 return 0; 1654 } 1655 1656 static void sfp_hwmon_exit(struct sfp *sfp) 1657 { 1658 cancel_delayed_work_sync(&sfp->hwmon_probe); 1659 } 1660 #else 1661 static int sfp_hwmon_insert(struct sfp *sfp) 1662 { 1663 return 0; 1664 } 1665 1666 static void sfp_hwmon_remove(struct sfp *sfp) 1667 { 1668 } 1669 1670 static int sfp_hwmon_init(struct sfp *sfp) 1671 { 1672 return 0; 1673 } 1674 1675 static void sfp_hwmon_exit(struct sfp *sfp) 1676 { 1677 } 1678 #endif 1679 1680 /* Helpers */ 1681 static void sfp_module_tx_disable(struct sfp *sfp) 1682 { 1683 dev_dbg(sfp->dev, "tx disable %u -> %u\n", 1684 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1); 1685 sfp_mod_state(sfp, SFP_F_TX_DISABLE, SFP_F_TX_DISABLE); 1686 } 1687 1688 static void sfp_module_tx_enable(struct sfp *sfp) 1689 { 1690 dev_dbg(sfp->dev, "tx disable %u -> %u\n", 1691 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0); 1692 sfp_mod_state(sfp, SFP_F_TX_DISABLE, 0); 1693 } 1694 1695 #if IS_ENABLED(CONFIG_DEBUG_FS) 1696 static int sfp_debug_state_show(struct seq_file *s, void *data) 1697 { 1698 struct sfp *sfp = s->private; 1699 1700 seq_printf(s, "Module state: %s\n", 1701 mod_state_to_str(sfp->sm_mod_state)); 1702 seq_printf(s, "Module probe attempts: %d %d\n", 1703 R_PROBE_RETRY_INIT - sfp->sm_mod_tries_init, 1704 R_PROBE_RETRY_SLOW - sfp->sm_mod_tries); 1705 seq_printf(s, "Device state: %s\n", 1706 dev_state_to_str(sfp->sm_dev_state)); 1707 seq_printf(s, "Main state: %s\n", 1708 sm_state_to_str(sfp->sm_state)); 1709 seq_printf(s, "Fault recovery remaining retries: %d\n", 1710 sfp->sm_fault_retries); 1711 seq_printf(s, "PHY probe remaining retries: %d\n", 1712 sfp->sm_phy_retries); 1713 seq_printf(s, "Signalling rate: %u kBd\n", sfp->rate_kbd); 1714 seq_printf(s, "Rate select threshold: %u kBd\n", 1715 sfp->rs_threshold_kbd); 1716 seq_printf(s, "moddef0: %d\n", !!(sfp->state & SFP_F_PRESENT)); 1717 seq_printf(s, "rx_los: %d\n", !!(sfp->state & SFP_F_LOS)); 1718 seq_printf(s, "tx_fault: %d\n", !!(sfp->state & SFP_F_TX_FAULT)); 1719 seq_printf(s, "tx_disable: %d\n", !!(sfp->state & SFP_F_TX_DISABLE)); 1720 seq_printf(s, "rs0: %d\n", !!(sfp->state & SFP_F_RS0)); 1721 seq_printf(s, "rs1: %d\n", !!(sfp->state & SFP_F_RS1)); 1722 return 0; 1723 } 1724 DEFINE_SHOW_ATTRIBUTE(sfp_debug_state); 1725 1726 static void sfp_debugfs_init(struct sfp *sfp) 1727 { 1728 sfp->debugfs_dir = debugfs_create_dir(dev_name(sfp->dev), NULL); 1729 1730 debugfs_create_file("state", 0600, sfp->debugfs_dir, sfp, 1731 &sfp_debug_state_fops); 1732 } 1733 1734 static void sfp_debugfs_exit(struct sfp *sfp) 1735 { 1736 debugfs_remove_recursive(sfp->debugfs_dir); 1737 } 1738 #else 1739 static void sfp_debugfs_init(struct sfp *sfp) 1740 { 1741 } 1742 1743 static void sfp_debugfs_exit(struct sfp *sfp) 1744 { 1745 } 1746 #endif 1747 1748 static void sfp_module_tx_fault_reset(struct sfp *sfp) 1749 { 1750 unsigned int state; 1751 1752 mutex_lock(&sfp->st_mutex); 1753 state = sfp->state; 1754 if (!(state & SFP_F_TX_DISABLE)) { 1755 sfp_set_state(sfp, state | SFP_F_TX_DISABLE); 1756 1757 udelay(T_RESET_US); 1758 1759 sfp_set_state(sfp, state); 1760 } 1761 mutex_unlock(&sfp->st_mutex); 1762 } 1763 1764 /* SFP state machine */ 1765 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout) 1766 { 1767 if (timeout) 1768 mod_delayed_work(system_power_efficient_wq, &sfp->timeout, 1769 timeout); 1770 else 1771 cancel_delayed_work(&sfp->timeout); 1772 } 1773 1774 static void sfp_sm_next(struct sfp *sfp, unsigned int state, 1775 unsigned int timeout) 1776 { 1777 sfp->sm_state = state; 1778 sfp_sm_set_timer(sfp, timeout); 1779 } 1780 1781 static void sfp_sm_mod_next(struct sfp *sfp, unsigned int state, 1782 unsigned int timeout) 1783 { 1784 sfp->sm_mod_state = state; 1785 sfp_sm_set_timer(sfp, timeout); 1786 } 1787 1788 static void sfp_sm_phy_detach(struct sfp *sfp) 1789 { 1790 sfp_remove_phy(sfp->sfp_bus); 1791 phy_device_remove(sfp->mod_phy); 1792 phy_device_free(sfp->mod_phy); 1793 sfp->mod_phy = NULL; 1794 } 1795 1796 static int sfp_sm_probe_phy(struct sfp *sfp, int addr, bool is_c45) 1797 { 1798 struct phy_device *phy; 1799 int err; 1800 1801 phy = get_phy_device(sfp->i2c_mii, addr, is_c45); 1802 if (phy == ERR_PTR(-ENODEV)) 1803 return PTR_ERR(phy); 1804 if (IS_ERR(phy)) { 1805 dev_err(sfp->dev, "mdiobus scan returned %pe\n", phy); 1806 return PTR_ERR(phy); 1807 } 1808 1809 /* Mark this PHY as being on a SFP module */ 1810 phy->is_on_sfp_module = true; 1811 1812 err = phy_device_register(phy); 1813 if (err) { 1814 phy_device_free(phy); 1815 dev_err(sfp->dev, "phy_device_register failed: %pe\n", 1816 ERR_PTR(err)); 1817 return err; 1818 } 1819 1820 err = sfp_add_phy(sfp->sfp_bus, phy); 1821 if (err) { 1822 phy_device_remove(phy); 1823 phy_device_free(phy); 1824 dev_err(sfp->dev, "sfp_add_phy failed: %pe\n", ERR_PTR(err)); 1825 return err; 1826 } 1827 1828 sfp->mod_phy = phy; 1829 1830 return 0; 1831 } 1832 1833 static void sfp_sm_link_up(struct sfp *sfp) 1834 { 1835 sfp_link_up(sfp->sfp_bus); 1836 sfp_sm_next(sfp, SFP_S_LINK_UP, 0); 1837 } 1838 1839 static void sfp_sm_link_down(struct sfp *sfp) 1840 { 1841 sfp_link_down(sfp->sfp_bus); 1842 } 1843 1844 static void sfp_sm_link_check_los(struct sfp *sfp) 1845 { 1846 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED); 1847 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL); 1848 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal); 1849 bool los = false; 1850 1851 /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL 1852 * are set, we assume that no LOS signal is available. If both are 1853 * set, we assume LOS is not implemented (and is meaningless.) 1854 */ 1855 if (los_options == los_inverted) 1856 los = !(sfp->state & SFP_F_LOS); 1857 else if (los_options == los_normal) 1858 los = !!(sfp->state & SFP_F_LOS); 1859 1860 if (los) 1861 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0); 1862 else 1863 sfp_sm_link_up(sfp); 1864 } 1865 1866 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event) 1867 { 1868 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED); 1869 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL); 1870 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal); 1871 1872 return (los_options == los_inverted && event == SFP_E_LOS_LOW) || 1873 (los_options == los_normal && event == SFP_E_LOS_HIGH); 1874 } 1875 1876 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event) 1877 { 1878 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED); 1879 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL); 1880 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal); 1881 1882 return (los_options == los_inverted && event == SFP_E_LOS_HIGH) || 1883 (los_options == los_normal && event == SFP_E_LOS_LOW); 1884 } 1885 1886 static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn) 1887 { 1888 if (sfp->sm_fault_retries && !--sfp->sm_fault_retries) { 1889 dev_err(sfp->dev, 1890 "module persistently indicates fault, disabling\n"); 1891 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0); 1892 } else { 1893 if (warn) 1894 dev_err(sfp->dev, "module transmit fault indicated\n"); 1895 1896 sfp_sm_next(sfp, next_state, T_FAULT_RECOVER); 1897 } 1898 } 1899 1900 static int sfp_sm_add_mdio_bus(struct sfp *sfp) 1901 { 1902 if (sfp->mdio_protocol != MDIO_I2C_NONE) 1903 return sfp_i2c_mdiobus_create(sfp); 1904 1905 return 0; 1906 } 1907 1908 /* Probe a SFP for a PHY device if the module supports copper - the PHY 1909 * normally sits at I2C bus address 0x56, and may either be a clause 22 1910 * or clause 45 PHY. 1911 * 1912 * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with 1913 * negotiation enabled, but some may be in 1000base-X - which is for the 1914 * PHY driver to determine. 1915 * 1916 * Clause 45 copper SFP+ modules (10G) appear to switch their interface 1917 * mode according to the negotiated line speed. 1918 */ 1919 static int sfp_sm_probe_for_phy(struct sfp *sfp) 1920 { 1921 int err = 0; 1922 1923 switch (sfp->mdio_protocol) { 1924 case MDIO_I2C_NONE: 1925 break; 1926 1927 case MDIO_I2C_MARVELL_C22: 1928 err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, false); 1929 break; 1930 1931 case MDIO_I2C_C45: 1932 err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, true); 1933 break; 1934 1935 case MDIO_I2C_ROLLBALL: 1936 err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR_ROLLBALL, true); 1937 break; 1938 } 1939 1940 return err; 1941 } 1942 1943 static int sfp_module_parse_power(struct sfp *sfp) 1944 { 1945 u32 power_mW = 1000; 1946 bool supports_a2; 1947 1948 if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV10_2 && 1949 sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL)) 1950 power_mW = 1500; 1951 /* Added in Rev 11.9, but there is no compliance code for this */ 1952 if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV11_4 && 1953 sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL)) 1954 power_mW = 2000; 1955 1956 /* Power level 1 modules (max. 1W) are always supported. */ 1957 if (power_mW <= 1000) { 1958 sfp->module_power_mW = power_mW; 1959 return 0; 1960 } 1961 1962 supports_a2 = sfp->id.ext.sff8472_compliance != 1963 SFP_SFF8472_COMPLIANCE_NONE || 1964 sfp->id.ext.diagmon & SFP_DIAGMON_DDM; 1965 1966 if (power_mW > sfp->max_power_mW) { 1967 /* Module power specification exceeds the allowed maximum. */ 1968 if (!supports_a2) { 1969 /* The module appears not to implement bus address 1970 * 0xa2, so assume that the module powers up in the 1971 * indicated mode. 1972 */ 1973 dev_err(sfp->dev, 1974 "Host does not support %u.%uW modules\n", 1975 power_mW / 1000, (power_mW / 100) % 10); 1976 return -EINVAL; 1977 } else { 1978 dev_warn(sfp->dev, 1979 "Host does not support %u.%uW modules, module left in power mode 1\n", 1980 power_mW / 1000, (power_mW / 100) % 10); 1981 return 0; 1982 } 1983 } 1984 1985 if (!supports_a2) { 1986 /* The module power level is below the host maximum and the 1987 * module appears not to implement bus address 0xa2, so assume 1988 * that the module powers up in the indicated mode. 1989 */ 1990 return 0; 1991 } 1992 1993 /* If the module requires a higher power mode, but also requires 1994 * an address change sequence, warn the user that the module may 1995 * not be functional. 1996 */ 1997 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) { 1998 dev_warn(sfp->dev, 1999 "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n", 2000 power_mW / 1000, (power_mW / 100) % 10); 2001 return 0; 2002 } 2003 2004 sfp->module_power_mW = power_mW; 2005 2006 return 0; 2007 } 2008 2009 static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable) 2010 { 2011 int err; 2012 2013 err = sfp_modify_u8(sfp, true, SFP_EXT_STATUS, 2014 SFP_EXT_STATUS_PWRLVL_SELECT, 2015 enable ? SFP_EXT_STATUS_PWRLVL_SELECT : 0); 2016 if (err != sizeof(u8)) { 2017 dev_err(sfp->dev, "failed to %sable high power: %pe\n", 2018 enable ? "en" : "dis", ERR_PTR(err)); 2019 return -EAGAIN; 2020 } 2021 2022 if (enable) 2023 dev_info(sfp->dev, "Module switched to %u.%uW power level\n", 2024 sfp->module_power_mW / 1000, 2025 (sfp->module_power_mW / 100) % 10); 2026 2027 return 0; 2028 } 2029 2030 static void sfp_module_parse_rate_select(struct sfp *sfp) 2031 { 2032 u8 rate_id; 2033 2034 sfp->rs_threshold_kbd = 0; 2035 sfp->rs_state_mask = 0; 2036 2037 if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_RATE_SELECT))) 2038 /* No support for RateSelect */ 2039 return; 2040 2041 /* Default to INF-8074 RateSelect operation. The signalling threshold 2042 * rate is not well specified, so always select "Full Bandwidth", but 2043 * SFF-8079 reveals that it is understood that RS0 will be low for 2044 * 1.0625Gb/s and high for 2.125Gb/s. Choose a value half-way between. 2045 * This method exists prior to SFF-8472. 2046 */ 2047 sfp->rs_state_mask = SFP_F_RS0; 2048 sfp->rs_threshold_kbd = 1594; 2049 2050 /* Parse the rate identifier, which is complicated due to history: 2051 * SFF-8472 rev 9.5 marks this field as reserved. 2052 * SFF-8079 references SFF-8472 rev 9.5 and defines bit 0. SFF-8472 2053 * compliance is not required. 2054 * SFF-8472 rev 10.2 defines this field using values 0..4 2055 * SFF-8472 rev 11.0 redefines this field with bit 0 for SFF-8079 2056 * and even values. 2057 */ 2058 rate_id = sfp->id.base.rate_id; 2059 if (rate_id == 0) 2060 /* Unspecified */ 2061 return; 2062 2063 /* SFF-8472 rev 10.0..10.4 did not account for SFF-8079 using bit 0, 2064 * and allocated value 3 to SFF-8431 independent tx/rx rate select. 2065 * Convert this to a SFF-8472 rev 11.0 rate identifier. 2066 */ 2067 if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV10_2 && 2068 sfp->id.ext.sff8472_compliance < SFP_SFF8472_COMPLIANCE_REV11_0 && 2069 rate_id == 3) 2070 rate_id = SFF_RID_8431; 2071 2072 if (rate_id & SFF_RID_8079) { 2073 /* SFF-8079 RateSelect / Application Select in conjunction with 2074 * SFF-8472 rev 9.5. SFF-8079 defines rate_id as a bitfield 2075 * with only bit 0 used, which takes precedence over SFF-8472. 2076 */ 2077 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_APP_SELECT_SFF8079)) { 2078 /* SFF-8079 Part 1 - rate selection between Fibre 2079 * Channel 1.0625/2.125/4.25 Gbd modes. Note that RS0 2080 * is high for 2125, so we have to subtract 1 to 2081 * include it. 2082 */ 2083 sfp->rs_threshold_kbd = 2125 - 1; 2084 sfp->rs_state_mask = SFP_F_RS0; 2085 } 2086 return; 2087 } 2088 2089 /* SFF-8472 rev 9.5 does not define the rate identifier */ 2090 if (sfp->id.ext.sff8472_compliance <= SFP_SFF8472_COMPLIANCE_REV9_5) 2091 return; 2092 2093 /* SFF-8472 rev 11.0 defines rate_id as a numerical value which will 2094 * always have bit 0 clear due to SFF-8079's bitfield usage of rate_id. 2095 */ 2096 switch (rate_id) { 2097 case SFF_RID_8431_RX_ONLY: 2098 sfp->rs_threshold_kbd = 4250; 2099 sfp->rs_state_mask = SFP_F_RS0; 2100 break; 2101 2102 case SFF_RID_8431_TX_ONLY: 2103 sfp->rs_threshold_kbd = 4250; 2104 sfp->rs_state_mask = SFP_F_RS1; 2105 break; 2106 2107 case SFF_RID_8431: 2108 sfp->rs_threshold_kbd = 4250; 2109 sfp->rs_state_mask = SFP_F_RS0 | SFP_F_RS1; 2110 break; 2111 2112 case SFF_RID_10G8G: 2113 sfp->rs_threshold_kbd = 9000; 2114 sfp->rs_state_mask = SFP_F_RS0 | SFP_F_RS1; 2115 break; 2116 } 2117 } 2118 2119 /* GPON modules based on Realtek RTL8672 and RTL9601C chips (e.g. V-SOL 2120 * V2801F, CarlitoxxPro CPGOS03-0490, Ubiquiti U-Fiber Instant, ...) do 2121 * not support multibyte reads from the EEPROM. Each multi-byte read 2122 * operation returns just one byte of EEPROM followed by zeros. There is 2123 * no way to identify which modules are using Realtek RTL8672 and RTL9601C 2124 * chips. Moreover every OEM of V-SOL V2801F module puts its own vendor 2125 * name and vendor id into EEPROM, so there is even no way to detect if 2126 * module is V-SOL V2801F. Therefore check for those zeros in the read 2127 * data and then based on check switch to reading EEPROM to one byte 2128 * at a time. 2129 */ 2130 static bool sfp_id_needs_byte_io(struct sfp *sfp, void *buf, size_t len) 2131 { 2132 size_t i, block_size = sfp->i2c_block_size; 2133 2134 /* Already using byte IO */ 2135 if (block_size == 1) 2136 return false; 2137 2138 for (i = 1; i < len; i += block_size) { 2139 if (memchr_inv(buf + i, '\0', min(block_size - 1, len - i))) 2140 return false; 2141 } 2142 return true; 2143 } 2144 2145 static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id) 2146 { 2147 u8 check; 2148 int err; 2149 2150 if (id->base.phys_id != SFF8024_ID_SFF_8472 || 2151 id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP || 2152 id->base.connector != SFF8024_CONNECTOR_LC) { 2153 dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n"); 2154 id->base.phys_id = SFF8024_ID_SFF_8472; 2155 id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP; 2156 id->base.connector = SFF8024_CONNECTOR_LC; 2157 err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3); 2158 if (err != 3) { 2159 dev_err(sfp->dev, 2160 "Failed to rewrite module EEPROM: %pe\n", 2161 ERR_PTR(err)); 2162 return err; 2163 } 2164 2165 /* Cotsworks modules have been found to require a delay between write operations. */ 2166 mdelay(50); 2167 2168 /* Update base structure checksum */ 2169 check = sfp_check(&id->base, sizeof(id->base) - 1); 2170 err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1); 2171 if (err != 1) { 2172 dev_err(sfp->dev, 2173 "Failed to update base structure checksum in fiber module EEPROM: %pe\n", 2174 ERR_PTR(err)); 2175 return err; 2176 } 2177 } 2178 return 0; 2179 } 2180 2181 static int sfp_module_parse_sff8472(struct sfp *sfp) 2182 { 2183 /* If the module requires address swap mode, warn about it */ 2184 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) 2185 dev_warn(sfp->dev, 2186 "module address swap to access page 0xA2 is not supported.\n"); 2187 else 2188 sfp->have_a2 = true; 2189 2190 return 0; 2191 } 2192 2193 static int sfp_sm_mod_probe(struct sfp *sfp, bool report) 2194 { 2195 /* SFP module inserted - read I2C data */ 2196 struct sfp_eeprom_id id; 2197 bool cotsworks_sfbg; 2198 unsigned int mask; 2199 bool cotsworks; 2200 u8 check; 2201 int ret; 2202 2203 sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE; 2204 2205 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base)); 2206 if (ret < 0) { 2207 if (report) 2208 dev_err(sfp->dev, "failed to read EEPROM: %pe\n", 2209 ERR_PTR(ret)); 2210 return -EAGAIN; 2211 } 2212 2213 if (ret != sizeof(id.base)) { 2214 dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret)); 2215 return -EAGAIN; 2216 } 2217 2218 /* Some SFP modules (e.g. Nokia 3FE46541AA) lock up if read from 2219 * address 0x51 is just one byte at a time. Also SFF-8472 requires 2220 * that EEPROM supports atomic 16bit read operation for diagnostic 2221 * fields, so do not switch to one byte reading at a time unless it 2222 * is really required and we have no other option. 2223 */ 2224 if (sfp_id_needs_byte_io(sfp, &id.base, sizeof(id.base))) { 2225 dev_info(sfp->dev, 2226 "Detected broken RTL8672/RTL9601C emulated EEPROM\n"); 2227 dev_info(sfp->dev, 2228 "Switching to reading EEPROM to one byte at a time\n"); 2229 sfp->i2c_block_size = 1; 2230 2231 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base)); 2232 if (ret < 0) { 2233 if (report) 2234 dev_err(sfp->dev, 2235 "failed to read EEPROM: %pe\n", 2236 ERR_PTR(ret)); 2237 return -EAGAIN; 2238 } 2239 2240 if (ret != sizeof(id.base)) { 2241 dev_err(sfp->dev, "EEPROM short read: %pe\n", 2242 ERR_PTR(ret)); 2243 return -EAGAIN; 2244 } 2245 } 2246 2247 /* Cotsworks do not seem to update the checksums when they 2248 * do the final programming with the final module part number, 2249 * serial number and date code. 2250 */ 2251 cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16); 2252 cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4); 2253 2254 /* Cotsworks SFF module EEPROM do not always have valid phys_id, 2255 * phys_ext_id, and connector bytes. Rewrite SFF EEPROM bytes if 2256 * Cotsworks PN matches and bytes are not correct. 2257 */ 2258 if (cotsworks && cotsworks_sfbg) { 2259 ret = sfp_cotsworks_fixup_check(sfp, &id); 2260 if (ret < 0) 2261 return ret; 2262 } 2263 2264 /* Validate the checksum over the base structure */ 2265 check = sfp_check(&id.base, sizeof(id.base) - 1); 2266 if (check != id.base.cc_base) { 2267 if (cotsworks) { 2268 dev_warn(sfp->dev, 2269 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n", 2270 check, id.base.cc_base); 2271 } else { 2272 dev_err(sfp->dev, 2273 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n", 2274 check, id.base.cc_base); 2275 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET, 2276 16, 1, &id, sizeof(id), true); 2277 return -EINVAL; 2278 } 2279 } 2280 2281 ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext)); 2282 if (ret < 0) { 2283 if (report) 2284 dev_err(sfp->dev, "failed to read EEPROM: %pe\n", 2285 ERR_PTR(ret)); 2286 return -EAGAIN; 2287 } 2288 2289 if (ret != sizeof(id.ext)) { 2290 dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret)); 2291 return -EAGAIN; 2292 } 2293 2294 check = sfp_check(&id.ext, sizeof(id.ext) - 1); 2295 if (check != id.ext.cc_ext) { 2296 if (cotsworks) { 2297 dev_warn(sfp->dev, 2298 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n", 2299 check, id.ext.cc_ext); 2300 } else { 2301 dev_err(sfp->dev, 2302 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n", 2303 check, id.ext.cc_ext); 2304 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET, 2305 16, 1, &id, sizeof(id), true); 2306 memset(&id.ext, 0, sizeof(id.ext)); 2307 } 2308 } 2309 2310 sfp->id = id; 2311 2312 dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n", 2313 (int)sizeof(id.base.vendor_name), id.base.vendor_name, 2314 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn, 2315 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev, 2316 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn, 2317 (int)sizeof(id.ext.datecode), id.ext.datecode); 2318 2319 /* Check whether we support this module */ 2320 if (!sfp->type->module_supported(&id)) { 2321 dev_err(sfp->dev, 2322 "module is not supported - phys id 0x%02x 0x%02x\n", 2323 sfp->id.base.phys_id, sfp->id.base.phys_ext_id); 2324 return -EINVAL; 2325 } 2326 2327 if (sfp->id.ext.sff8472_compliance != SFP_SFF8472_COMPLIANCE_NONE) { 2328 ret = sfp_module_parse_sff8472(sfp); 2329 if (ret < 0) 2330 return ret; 2331 } 2332 2333 /* Parse the module power requirement */ 2334 ret = sfp_module_parse_power(sfp); 2335 if (ret < 0) 2336 return ret; 2337 2338 sfp_module_parse_rate_select(sfp); 2339 2340 mask = SFP_F_PRESENT; 2341 if (sfp->gpio[GPIO_TX_DISABLE]) 2342 mask |= SFP_F_TX_DISABLE; 2343 if (sfp->gpio[GPIO_TX_FAULT]) 2344 mask |= SFP_F_TX_FAULT; 2345 if (sfp->gpio[GPIO_LOS]) 2346 mask |= SFP_F_LOS; 2347 if (sfp->gpio[GPIO_RS0]) 2348 mask |= SFP_F_RS0; 2349 if (sfp->gpio[GPIO_RS1]) 2350 mask |= SFP_F_RS1; 2351 2352 sfp->module_t_start_up = T_START_UP; 2353 sfp->module_t_wait = T_WAIT; 2354 sfp->phy_t_retry = T_PHY_RETRY; 2355 2356 sfp->state_ignore_mask = 0; 2357 2358 if (sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SFI || 2359 sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SR || 2360 sfp->id.base.extended_cc == SFF8024_ECC_5GBASE_T || 2361 sfp->id.base.extended_cc == SFF8024_ECC_2_5GBASE_T) 2362 sfp->mdio_protocol = MDIO_I2C_C45; 2363 else if (sfp->id.base.e1000_base_t) 2364 sfp->mdio_protocol = MDIO_I2C_MARVELL_C22; 2365 else 2366 sfp->mdio_protocol = MDIO_I2C_NONE; 2367 2368 sfp->quirk = sfp_lookup_quirk(&id); 2369 2370 mutex_lock(&sfp->st_mutex); 2371 /* Initialise state bits to use from hardware */ 2372 sfp->state_hw_mask = mask; 2373 2374 /* We want to drive the rate select pins that the module is using */ 2375 sfp->state_hw_drive |= sfp->rs_state_mask; 2376 2377 if (sfp->quirk && sfp->quirk->fixup) 2378 sfp->quirk->fixup(sfp); 2379 2380 sfp->state_hw_mask &= ~sfp->state_ignore_mask; 2381 mutex_unlock(&sfp->st_mutex); 2382 2383 return 0; 2384 } 2385 2386 static void sfp_sm_mod_remove(struct sfp *sfp) 2387 { 2388 if (sfp->sm_mod_state > SFP_MOD_WAITDEV) 2389 sfp_module_remove(sfp->sfp_bus); 2390 2391 sfp_hwmon_remove(sfp); 2392 2393 memset(&sfp->id, 0, sizeof(sfp->id)); 2394 sfp->module_power_mW = 0; 2395 sfp->state_hw_drive = SFP_F_TX_DISABLE; 2396 sfp->have_a2 = false; 2397 2398 dev_info(sfp->dev, "module removed\n"); 2399 } 2400 2401 /* This state machine tracks the upstream's state */ 2402 static void sfp_sm_device(struct sfp *sfp, unsigned int event) 2403 { 2404 switch (sfp->sm_dev_state) { 2405 default: 2406 if (event == SFP_E_DEV_ATTACH) 2407 sfp->sm_dev_state = SFP_DEV_DOWN; 2408 break; 2409 2410 case SFP_DEV_DOWN: 2411 if (event == SFP_E_DEV_DETACH) 2412 sfp->sm_dev_state = SFP_DEV_DETACHED; 2413 else if (event == SFP_E_DEV_UP) 2414 sfp->sm_dev_state = SFP_DEV_UP; 2415 break; 2416 2417 case SFP_DEV_UP: 2418 if (event == SFP_E_DEV_DETACH) 2419 sfp->sm_dev_state = SFP_DEV_DETACHED; 2420 else if (event == SFP_E_DEV_DOWN) 2421 sfp->sm_dev_state = SFP_DEV_DOWN; 2422 break; 2423 } 2424 } 2425 2426 /* This state machine tracks the insert/remove state of the module, probes 2427 * the on-board EEPROM, and sets up the power level. 2428 */ 2429 static void sfp_sm_module(struct sfp *sfp, unsigned int event) 2430 { 2431 int err; 2432 2433 /* Handle remove event globally, it resets this state machine */ 2434 if (event == SFP_E_REMOVE) { 2435 sfp_sm_mod_remove(sfp); 2436 sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0); 2437 return; 2438 } 2439 2440 /* Handle device detach globally */ 2441 if (sfp->sm_dev_state < SFP_DEV_DOWN && 2442 sfp->sm_mod_state > SFP_MOD_WAITDEV) { 2443 if (sfp->module_power_mW > 1000 && 2444 sfp->sm_mod_state > SFP_MOD_HPOWER) 2445 sfp_sm_mod_hpower(sfp, false); 2446 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0); 2447 return; 2448 } 2449 2450 switch (sfp->sm_mod_state) { 2451 default: 2452 if (event == SFP_E_INSERT) { 2453 sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL); 2454 sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT; 2455 sfp->sm_mod_tries = R_PROBE_RETRY_SLOW; 2456 } 2457 break; 2458 2459 case SFP_MOD_PROBE: 2460 /* Wait for T_PROBE_INIT to time out */ 2461 if (event != SFP_E_TIMEOUT) 2462 break; 2463 2464 err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1); 2465 if (err == -EAGAIN) { 2466 if (sfp->sm_mod_tries_init && 2467 --sfp->sm_mod_tries_init) { 2468 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT); 2469 break; 2470 } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) { 2471 if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1) 2472 dev_warn(sfp->dev, 2473 "please wait, module slow to respond\n"); 2474 sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW); 2475 break; 2476 } 2477 } 2478 if (err < 0) { 2479 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0); 2480 break; 2481 } 2482 2483 /* Force a poll to re-read the hardware signal state after 2484 * sfp_sm_mod_probe() changed state_hw_mask. 2485 */ 2486 mod_delayed_work(system_wq, &sfp->poll, 1); 2487 2488 err = sfp_hwmon_insert(sfp); 2489 if (err) 2490 dev_warn(sfp->dev, "hwmon probe failed: %pe\n", 2491 ERR_PTR(err)); 2492 2493 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0); 2494 fallthrough; 2495 case SFP_MOD_WAITDEV: 2496 /* Ensure that the device is attached before proceeding */ 2497 if (sfp->sm_dev_state < SFP_DEV_DOWN) 2498 break; 2499 2500 /* Report the module insertion to the upstream device */ 2501 err = sfp_module_insert(sfp->sfp_bus, &sfp->id, 2502 sfp->quirk); 2503 if (err < 0) { 2504 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0); 2505 break; 2506 } 2507 2508 /* If this is a power level 1 module, we are done */ 2509 if (sfp->module_power_mW <= 1000) 2510 goto insert; 2511 2512 sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0); 2513 fallthrough; 2514 case SFP_MOD_HPOWER: 2515 /* Enable high power mode */ 2516 err = sfp_sm_mod_hpower(sfp, true); 2517 if (err < 0) { 2518 if (err != -EAGAIN) { 2519 sfp_module_remove(sfp->sfp_bus); 2520 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0); 2521 } else { 2522 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT); 2523 } 2524 break; 2525 } 2526 2527 sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL); 2528 break; 2529 2530 case SFP_MOD_WAITPWR: 2531 /* Wait for T_HPOWER_LEVEL to time out */ 2532 if (event != SFP_E_TIMEOUT) 2533 break; 2534 2535 insert: 2536 sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0); 2537 break; 2538 2539 case SFP_MOD_PRESENT: 2540 case SFP_MOD_ERROR: 2541 break; 2542 } 2543 } 2544 2545 static void sfp_sm_main(struct sfp *sfp, unsigned int event) 2546 { 2547 unsigned long timeout; 2548 int ret; 2549 2550 /* Some events are global */ 2551 if (sfp->sm_state != SFP_S_DOWN && 2552 (sfp->sm_mod_state != SFP_MOD_PRESENT || 2553 sfp->sm_dev_state != SFP_DEV_UP)) { 2554 if (sfp->sm_state == SFP_S_LINK_UP && 2555 sfp->sm_dev_state == SFP_DEV_UP) 2556 sfp_sm_link_down(sfp); 2557 if (sfp->sm_state > SFP_S_INIT) 2558 sfp_module_stop(sfp->sfp_bus); 2559 if (sfp->mod_phy) 2560 sfp_sm_phy_detach(sfp); 2561 if (sfp->i2c_mii) 2562 sfp_i2c_mdiobus_destroy(sfp); 2563 sfp_module_tx_disable(sfp); 2564 sfp_soft_stop_poll(sfp); 2565 sfp_sm_next(sfp, SFP_S_DOWN, 0); 2566 return; 2567 } 2568 2569 /* The main state machine */ 2570 switch (sfp->sm_state) { 2571 case SFP_S_DOWN: 2572 if (sfp->sm_mod_state != SFP_MOD_PRESENT || 2573 sfp->sm_dev_state != SFP_DEV_UP) 2574 break; 2575 2576 /* Only use the soft state bits if we have access to the A2h 2577 * memory, which implies that we have some level of SFF-8472 2578 * compliance. 2579 */ 2580 if (sfp->have_a2) 2581 sfp_soft_start_poll(sfp); 2582 2583 sfp_module_tx_enable(sfp); 2584 2585 /* Initialise the fault clearance retries */ 2586 sfp->sm_fault_retries = N_FAULT_INIT; 2587 2588 /* We need to check the TX_FAULT state, which is not defined 2589 * while TX_DISABLE is asserted. The earliest we want to do 2590 * anything (such as probe for a PHY) is 50ms (or more on 2591 * specific modules). 2592 */ 2593 sfp_sm_next(sfp, SFP_S_WAIT, sfp->module_t_wait); 2594 break; 2595 2596 case SFP_S_WAIT: 2597 if (event != SFP_E_TIMEOUT) 2598 break; 2599 2600 if (sfp->state & SFP_F_TX_FAULT) { 2601 /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431) 2602 * from the TX_DISABLE deassertion for the module to 2603 * initialise, which is indicated by TX_FAULT 2604 * deasserting. 2605 */ 2606 timeout = sfp->module_t_start_up; 2607 if (timeout > sfp->module_t_wait) 2608 timeout -= sfp->module_t_wait; 2609 else 2610 timeout = 1; 2611 2612 sfp_sm_next(sfp, SFP_S_INIT, timeout); 2613 } else { 2614 /* TX_FAULT is not asserted, assume the module has 2615 * finished initialising. 2616 */ 2617 goto init_done; 2618 } 2619 break; 2620 2621 case SFP_S_INIT: 2622 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) { 2623 /* TX_FAULT is still asserted after t_init 2624 * or t_start_up, so assume there is a fault. 2625 */ 2626 sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT, 2627 sfp->sm_fault_retries == N_FAULT_INIT); 2628 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { 2629 init_done: 2630 /* Create mdiobus and start trying for PHY */ 2631 ret = sfp_sm_add_mdio_bus(sfp); 2632 if (ret < 0) { 2633 sfp_sm_next(sfp, SFP_S_FAIL, 0); 2634 break; 2635 } 2636 sfp->sm_phy_retries = R_PHY_RETRY; 2637 goto phy_probe; 2638 } 2639 break; 2640 2641 case SFP_S_INIT_PHY: 2642 if (event != SFP_E_TIMEOUT) 2643 break; 2644 phy_probe: 2645 /* TX_FAULT deasserted or we timed out with TX_FAULT 2646 * clear. Probe for the PHY and check the LOS state. 2647 */ 2648 ret = sfp_sm_probe_for_phy(sfp); 2649 if (ret == -ENODEV) { 2650 if (--sfp->sm_phy_retries) { 2651 sfp_sm_next(sfp, SFP_S_INIT_PHY, 2652 sfp->phy_t_retry); 2653 dev_dbg(sfp->dev, 2654 "no PHY detected, %u tries left\n", 2655 sfp->sm_phy_retries); 2656 break; 2657 } else { 2658 dev_info(sfp->dev, "no PHY detected\n"); 2659 } 2660 } else if (ret) { 2661 sfp_sm_next(sfp, SFP_S_FAIL, 0); 2662 break; 2663 } 2664 if (sfp_module_start(sfp->sfp_bus)) { 2665 sfp_sm_next(sfp, SFP_S_FAIL, 0); 2666 break; 2667 } 2668 sfp_sm_link_check_los(sfp); 2669 2670 /* Reset the fault retry count */ 2671 sfp->sm_fault_retries = N_FAULT; 2672 break; 2673 2674 case SFP_S_INIT_TX_FAULT: 2675 if (event == SFP_E_TIMEOUT) { 2676 sfp_module_tx_fault_reset(sfp); 2677 sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up); 2678 } 2679 break; 2680 2681 case SFP_S_WAIT_LOS: 2682 if (event == SFP_E_TX_FAULT) 2683 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true); 2684 else if (sfp_los_event_inactive(sfp, event)) 2685 sfp_sm_link_up(sfp); 2686 break; 2687 2688 case SFP_S_LINK_UP: 2689 if (event == SFP_E_TX_FAULT) { 2690 sfp_sm_link_down(sfp); 2691 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true); 2692 } else if (sfp_los_event_active(sfp, event)) { 2693 sfp_sm_link_down(sfp); 2694 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0); 2695 } 2696 break; 2697 2698 case SFP_S_TX_FAULT: 2699 if (event == SFP_E_TIMEOUT) { 2700 sfp_module_tx_fault_reset(sfp); 2701 sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up); 2702 } 2703 break; 2704 2705 case SFP_S_REINIT: 2706 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) { 2707 sfp_sm_fault(sfp, SFP_S_TX_FAULT, false); 2708 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { 2709 dev_info(sfp->dev, "module transmit fault recovered\n"); 2710 sfp_sm_link_check_los(sfp); 2711 } 2712 break; 2713 2714 case SFP_S_TX_DISABLE: 2715 break; 2716 } 2717 } 2718 2719 static void __sfp_sm_event(struct sfp *sfp, unsigned int event) 2720 { 2721 dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n", 2722 mod_state_to_str(sfp->sm_mod_state), 2723 dev_state_to_str(sfp->sm_dev_state), 2724 sm_state_to_str(sfp->sm_state), 2725 event_to_str(event)); 2726 2727 sfp_sm_device(sfp, event); 2728 sfp_sm_module(sfp, event); 2729 sfp_sm_main(sfp, event); 2730 2731 dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n", 2732 mod_state_to_str(sfp->sm_mod_state), 2733 dev_state_to_str(sfp->sm_dev_state), 2734 sm_state_to_str(sfp->sm_state)); 2735 } 2736 2737 static void sfp_sm_event(struct sfp *sfp, unsigned int event) 2738 { 2739 mutex_lock(&sfp->sm_mutex); 2740 __sfp_sm_event(sfp, event); 2741 mutex_unlock(&sfp->sm_mutex); 2742 } 2743 2744 static void sfp_attach(struct sfp *sfp) 2745 { 2746 sfp_sm_event(sfp, SFP_E_DEV_ATTACH); 2747 } 2748 2749 static void sfp_detach(struct sfp *sfp) 2750 { 2751 sfp_sm_event(sfp, SFP_E_DEV_DETACH); 2752 } 2753 2754 static void sfp_start(struct sfp *sfp) 2755 { 2756 sfp_sm_event(sfp, SFP_E_DEV_UP); 2757 } 2758 2759 static void sfp_stop(struct sfp *sfp) 2760 { 2761 sfp_sm_event(sfp, SFP_E_DEV_DOWN); 2762 } 2763 2764 static void sfp_set_signal_rate(struct sfp *sfp, unsigned int rate_kbd) 2765 { 2766 unsigned int set; 2767 2768 sfp->rate_kbd = rate_kbd; 2769 2770 if (rate_kbd > sfp->rs_threshold_kbd) 2771 set = sfp->rs_state_mask; 2772 else 2773 set = 0; 2774 2775 sfp_mod_state(sfp, SFP_F_RS0 | SFP_F_RS1, set); 2776 } 2777 2778 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo) 2779 { 2780 /* locking... and check module is present */ 2781 2782 if (sfp->id.ext.sff8472_compliance && 2783 !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) { 2784 modinfo->type = ETH_MODULE_SFF_8472; 2785 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN; 2786 } else { 2787 modinfo->type = ETH_MODULE_SFF_8079; 2788 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN; 2789 } 2790 return 0; 2791 } 2792 2793 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee, 2794 u8 *data) 2795 { 2796 unsigned int first, last, len; 2797 int ret; 2798 2799 if (!(sfp->state & SFP_F_PRESENT)) 2800 return -ENODEV; 2801 2802 if (ee->len == 0) 2803 return -EINVAL; 2804 2805 first = ee->offset; 2806 last = ee->offset + ee->len; 2807 if (first < ETH_MODULE_SFF_8079_LEN) { 2808 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN); 2809 len -= first; 2810 2811 ret = sfp_read(sfp, false, first, data, len); 2812 if (ret < 0) 2813 return ret; 2814 2815 first += len; 2816 data += len; 2817 } 2818 if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) { 2819 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN); 2820 len -= first; 2821 first -= ETH_MODULE_SFF_8079_LEN; 2822 2823 ret = sfp_read(sfp, true, first, data, len); 2824 if (ret < 0) 2825 return ret; 2826 } 2827 return 0; 2828 } 2829 2830 static int sfp_module_eeprom_by_page(struct sfp *sfp, 2831 const struct ethtool_module_eeprom *page, 2832 struct netlink_ext_ack *extack) 2833 { 2834 if (!(sfp->state & SFP_F_PRESENT)) 2835 return -ENODEV; 2836 2837 if (page->bank) { 2838 NL_SET_ERR_MSG(extack, "Banks not supported"); 2839 return -EOPNOTSUPP; 2840 } 2841 2842 if (page->page) { 2843 NL_SET_ERR_MSG(extack, "Only page 0 supported"); 2844 return -EOPNOTSUPP; 2845 } 2846 2847 if (page->i2c_address != 0x50 && 2848 page->i2c_address != 0x51) { 2849 NL_SET_ERR_MSG(extack, "Only address 0x50 and 0x51 supported"); 2850 return -EOPNOTSUPP; 2851 } 2852 2853 return sfp_read(sfp, page->i2c_address == 0x51, page->offset, 2854 page->data, page->length); 2855 }; 2856 2857 static const struct sfp_socket_ops sfp_module_ops = { 2858 .attach = sfp_attach, 2859 .detach = sfp_detach, 2860 .start = sfp_start, 2861 .stop = sfp_stop, 2862 .set_signal_rate = sfp_set_signal_rate, 2863 .module_info = sfp_module_info, 2864 .module_eeprom = sfp_module_eeprom, 2865 .module_eeprom_by_page = sfp_module_eeprom_by_page, 2866 }; 2867 2868 static void sfp_timeout(struct work_struct *work) 2869 { 2870 struct sfp *sfp = container_of(work, struct sfp, timeout.work); 2871 2872 rtnl_lock(); 2873 sfp_sm_event(sfp, SFP_E_TIMEOUT); 2874 rtnl_unlock(); 2875 } 2876 2877 static void sfp_check_state(struct sfp *sfp) 2878 { 2879 unsigned int state, i, changed; 2880 2881 rtnl_lock(); 2882 mutex_lock(&sfp->st_mutex); 2883 state = sfp_get_state(sfp); 2884 changed = state ^ sfp->state; 2885 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT; 2886 2887 for (i = 0; i < GPIO_MAX; i++) 2888 if (changed & BIT(i)) 2889 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_names[i], 2890 !!(sfp->state & BIT(i)), !!(state & BIT(i))); 2891 2892 state |= sfp->state & SFP_F_OUTPUTS; 2893 sfp->state = state; 2894 mutex_unlock(&sfp->st_mutex); 2895 2896 mutex_lock(&sfp->sm_mutex); 2897 if (changed & SFP_F_PRESENT) 2898 __sfp_sm_event(sfp, state & SFP_F_PRESENT ? 2899 SFP_E_INSERT : SFP_E_REMOVE); 2900 2901 if (changed & SFP_F_TX_FAULT) 2902 __sfp_sm_event(sfp, state & SFP_F_TX_FAULT ? 2903 SFP_E_TX_FAULT : SFP_E_TX_CLEAR); 2904 2905 if (changed & SFP_F_LOS) 2906 __sfp_sm_event(sfp, state & SFP_F_LOS ? 2907 SFP_E_LOS_HIGH : SFP_E_LOS_LOW); 2908 mutex_unlock(&sfp->sm_mutex); 2909 rtnl_unlock(); 2910 } 2911 2912 static irqreturn_t sfp_irq(int irq, void *data) 2913 { 2914 struct sfp *sfp = data; 2915 2916 sfp_check_state(sfp); 2917 2918 return IRQ_HANDLED; 2919 } 2920 2921 static void sfp_poll(struct work_struct *work) 2922 { 2923 struct sfp *sfp = container_of(work, struct sfp, poll.work); 2924 2925 sfp_check_state(sfp); 2926 2927 // st_mutex doesn't need to be held here for state_soft_mask, 2928 // it's unimportant if we race while reading this. 2929 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) || 2930 sfp->need_poll) 2931 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 2932 } 2933 2934 static struct sfp *sfp_alloc(struct device *dev) 2935 { 2936 struct sfp *sfp; 2937 2938 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL); 2939 if (!sfp) 2940 return ERR_PTR(-ENOMEM); 2941 2942 sfp->dev = dev; 2943 sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE; 2944 2945 mutex_init(&sfp->sm_mutex); 2946 mutex_init(&sfp->st_mutex); 2947 INIT_DELAYED_WORK(&sfp->poll, sfp_poll); 2948 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout); 2949 2950 sfp_hwmon_init(sfp); 2951 2952 return sfp; 2953 } 2954 2955 static void sfp_cleanup(void *data) 2956 { 2957 struct sfp *sfp = data; 2958 2959 sfp_hwmon_exit(sfp); 2960 2961 cancel_delayed_work_sync(&sfp->poll); 2962 cancel_delayed_work_sync(&sfp->timeout); 2963 if (sfp->i2c_mii) { 2964 mdiobus_unregister(sfp->i2c_mii); 2965 mdiobus_free(sfp->i2c_mii); 2966 } 2967 if (sfp->i2c) 2968 i2c_put_adapter(sfp->i2c); 2969 kfree(sfp); 2970 } 2971 2972 static int sfp_i2c_get(struct sfp *sfp) 2973 { 2974 struct fwnode_handle *h; 2975 struct i2c_adapter *i2c; 2976 int err; 2977 2978 h = fwnode_find_reference(dev_fwnode(sfp->dev), "i2c-bus", 0); 2979 if (IS_ERR(h)) { 2980 dev_err(sfp->dev, "missing 'i2c-bus' property\n"); 2981 return -ENODEV; 2982 } 2983 2984 i2c = i2c_get_adapter_by_fwnode(h); 2985 if (!i2c) { 2986 err = -EPROBE_DEFER; 2987 goto put; 2988 } 2989 2990 err = sfp_i2c_configure(sfp, i2c); 2991 if (err) 2992 i2c_put_adapter(i2c); 2993 put: 2994 fwnode_handle_put(h); 2995 return err; 2996 } 2997 2998 static int sfp_probe(struct platform_device *pdev) 2999 { 3000 const struct sff_data *sff; 3001 char *sfp_irq_name; 3002 struct sfp *sfp; 3003 int err, i; 3004 3005 sfp = sfp_alloc(&pdev->dev); 3006 if (IS_ERR(sfp)) 3007 return PTR_ERR(sfp); 3008 3009 platform_set_drvdata(pdev, sfp); 3010 3011 err = devm_add_action_or_reset(sfp->dev, sfp_cleanup, sfp); 3012 if (err < 0) 3013 return err; 3014 3015 sff = device_get_match_data(sfp->dev); 3016 if (!sff) 3017 sff = &sfp_data; 3018 3019 sfp->type = sff; 3020 3021 err = sfp_i2c_get(sfp); 3022 if (err) 3023 return err; 3024 3025 for (i = 0; i < GPIO_MAX; i++) 3026 if (sff->gpios & BIT(i)) { 3027 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev, 3028 gpio_names[i], gpio_flags[i]); 3029 if (IS_ERR(sfp->gpio[i])) 3030 return PTR_ERR(sfp->gpio[i]); 3031 } 3032 3033 sfp->state_hw_mask = SFP_F_PRESENT; 3034 sfp->state_hw_drive = SFP_F_TX_DISABLE; 3035 3036 sfp->get_state = sfp_gpio_get_state; 3037 sfp->set_state = sfp_gpio_set_state; 3038 3039 /* Modules that have no detect signal are always present */ 3040 if (!(sfp->gpio[GPIO_MODDEF0])) 3041 sfp->get_state = sff_gpio_get_state; 3042 3043 device_property_read_u32(&pdev->dev, "maximum-power-milliwatt", 3044 &sfp->max_power_mW); 3045 if (sfp->max_power_mW < 1000) { 3046 if (sfp->max_power_mW) 3047 dev_warn(sfp->dev, 3048 "Firmware bug: host maximum power should be at least 1W\n"); 3049 sfp->max_power_mW = 1000; 3050 } 3051 3052 dev_info(sfp->dev, "Host maximum power %u.%uW\n", 3053 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10); 3054 3055 /* Get the initial state, and always signal TX disable, 3056 * since the network interface will not be up. 3057 */ 3058 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE; 3059 3060 if (sfp->gpio[GPIO_RS0] && 3061 gpiod_get_value_cansleep(sfp->gpio[GPIO_RS0])) 3062 sfp->state |= SFP_F_RS0; 3063 sfp_set_state(sfp, sfp->state); 3064 sfp_module_tx_disable(sfp); 3065 if (sfp->state & SFP_F_PRESENT) { 3066 rtnl_lock(); 3067 sfp_sm_event(sfp, SFP_E_INSERT); 3068 rtnl_unlock(); 3069 } 3070 3071 for (i = 0; i < GPIO_MAX; i++) { 3072 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i]) 3073 continue; 3074 3075 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]); 3076 if (sfp->gpio_irq[i] < 0) { 3077 sfp->gpio_irq[i] = 0; 3078 sfp->need_poll = true; 3079 continue; 3080 } 3081 3082 sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL, 3083 "%s-%s", dev_name(sfp->dev), 3084 gpio_names[i]); 3085 3086 if (!sfp_irq_name) 3087 return -ENOMEM; 3088 3089 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i], 3090 NULL, sfp_irq, 3091 IRQF_ONESHOT | 3092 IRQF_TRIGGER_RISING | 3093 IRQF_TRIGGER_FALLING, 3094 sfp_irq_name, sfp); 3095 if (err) { 3096 sfp->gpio_irq[i] = 0; 3097 sfp->need_poll = true; 3098 } 3099 } 3100 3101 if (sfp->need_poll) 3102 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies); 3103 3104 /* We could have an issue in cases no Tx disable pin is available or 3105 * wired as modules using a laser as their light source will continue to 3106 * be active when the fiber is removed. This could be a safety issue and 3107 * we should at least warn the user about that. 3108 */ 3109 if (!sfp->gpio[GPIO_TX_DISABLE]) 3110 dev_warn(sfp->dev, 3111 "No tx_disable pin: SFP modules will always be emitting.\n"); 3112 3113 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops); 3114 if (!sfp->sfp_bus) 3115 return -ENOMEM; 3116 3117 sfp_debugfs_init(sfp); 3118 3119 return 0; 3120 } 3121 3122 static void sfp_remove(struct platform_device *pdev) 3123 { 3124 struct sfp *sfp = platform_get_drvdata(pdev); 3125 3126 sfp_debugfs_exit(sfp); 3127 sfp_unregister_socket(sfp->sfp_bus); 3128 3129 rtnl_lock(); 3130 sfp_sm_event(sfp, SFP_E_REMOVE); 3131 rtnl_unlock(); 3132 } 3133 3134 static void sfp_shutdown(struct platform_device *pdev) 3135 { 3136 struct sfp *sfp = platform_get_drvdata(pdev); 3137 int i; 3138 3139 for (i = 0; i < GPIO_MAX; i++) { 3140 if (!sfp->gpio_irq[i]) 3141 continue; 3142 3143 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp); 3144 } 3145 3146 cancel_delayed_work_sync(&sfp->poll); 3147 cancel_delayed_work_sync(&sfp->timeout); 3148 } 3149 3150 static struct platform_driver sfp_driver = { 3151 .probe = sfp_probe, 3152 .remove = sfp_remove, 3153 .shutdown = sfp_shutdown, 3154 .driver = { 3155 .name = "sfp", 3156 .of_match_table = sfp_of_match, 3157 }, 3158 }; 3159 3160 static int sfp_init(void) 3161 { 3162 poll_jiffies = msecs_to_jiffies(100); 3163 3164 return platform_driver_register(&sfp_driver); 3165 } 3166 module_init(sfp_init); 3167 3168 static void sfp_exit(void) 3169 { 3170 platform_driver_unregister(&sfp_driver); 3171 } 3172 module_exit(sfp_exit); 3173 3174 MODULE_ALIAS("platform:sfp"); 3175 MODULE_AUTHOR("Russell King"); 3176 MODULE_LICENSE("GPL v2"); 3177 MODULE_DESCRIPTION("SFP cage support"); 3178