drivers/net/phy/sfp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/acpi.h>
   3 #include <linux/ctype.h>
   4 #include <linux/delay.h>
   5 #include <linux/gpio/consumer.h>
   6 #include <linux/hwmon.h>
   7 #include <linux/i2c.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/jiffies.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 "mdio-i2c.h"
  20 #include "sfp.h"
  21 #include "swphy.h"
  22
  23 enum {
  24         GPIO_MODDEF0,
  25         GPIO_LOS,
  26         GPIO_TX_FAULT,
  27         GPIO_TX_DISABLE,
  28         GPIO_RATE_SELECT,
  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_RATE_SELECT = BIT(GPIO_RATE_SELECT),
  36
  37         SFP_E_INSERT = 0,
  38         SFP_E_REMOVE,
  39         SFP_E_DEV_DOWN,
  40         SFP_E_DEV_UP,
  41         SFP_E_TX_FAULT,
  42         SFP_E_TX_CLEAR,
  43         SFP_E_LOS_HIGH,
  44         SFP_E_LOS_LOW,
  45         SFP_E_TIMEOUT,
  46
  47         SFP_MOD_EMPTY = 0,
  48         SFP_MOD_PROBE,
  49         SFP_MOD_HPOWER,
  50         SFP_MOD_PRESENT,
  51         SFP_MOD_ERROR,
  52
  53         SFP_DEV_DOWN = 0,
  54         SFP_DEV_UP,
  55
  56         SFP_S_DOWN = 0,
  57         SFP_S_INIT,
  58         SFP_S_WAIT_LOS,
  59         SFP_S_LINK_UP,
  60         SFP_S_TX_FAULT,
  61         SFP_S_REINIT,
  62         SFP_S_TX_DISABLE,
  63 };
  64
  65 static const char  * const mod_state_strings[] = {
  66         [SFP_MOD_EMPTY] = "empty",
  67         [SFP_MOD_PROBE] = "probe",
  68         [SFP_MOD_HPOWER] = "hpower",
  69         [SFP_MOD_PRESENT] = "present",
  70         [SFP_MOD_ERROR] = "error",
  71 };
  72
  73 static const char *mod_state_to_str(unsigned short mod_state)
  74 {
  75         if (mod_state >= ARRAY_SIZE(mod_state_strings))
  76                 return "Unknown module state";
  77         return mod_state_strings[mod_state];
  78 }
  79
  80 static const char * const dev_state_strings[] = {
  81         [SFP_DEV_DOWN] = "down",
  82         [SFP_DEV_UP] = "up",
  83 };
  84
  85 static const char *dev_state_to_str(unsigned short dev_state)
  86 {
  87         if (dev_state >= ARRAY_SIZE(dev_state_strings))
  88                 return "Unknown device state";
  89         return dev_state_strings[dev_state];
  90 }
  91
  92 static const char * const event_strings[] = {
  93         [SFP_E_INSERT] = "insert",
  94         [SFP_E_REMOVE] = "remove",
  95         [SFP_E_DEV_DOWN] = "dev_down",
  96         [SFP_E_DEV_UP] = "dev_up",
  97         [SFP_E_TX_FAULT] = "tx_fault",
  98         [SFP_E_TX_CLEAR] = "tx_clear",
  99         [SFP_E_LOS_HIGH] = "los_high",
 100         [SFP_E_LOS_LOW] = "los_low",
 101         [SFP_E_TIMEOUT] = "timeout",
 102 };
 103
 104 static const char *event_to_str(unsigned short event)
 105 {
 106         if (event >= ARRAY_SIZE(event_strings))
 107                 return "Unknown event";
 108         return event_strings[event];
 109 }
 110
 111 static const char * const sm_state_strings[] = {
 112         [SFP_S_DOWN] = "down",
 113         [SFP_S_INIT] = "init",
 114         [SFP_S_WAIT_LOS] = "wait_los",
 115         [SFP_S_LINK_UP] = "link_up",
 116         [SFP_S_TX_FAULT] = "tx_fault",
 117         [SFP_S_REINIT] = "reinit",
 118         [SFP_S_TX_DISABLE] = "rx_disable",
 119 };
 120
 121 static const char *sm_state_to_str(unsigned short sm_state)
 122 {
 123         if (sm_state >= ARRAY_SIZE(sm_state_strings))
 124                 return "Unknown state";
 125         return sm_state_strings[sm_state];
 126 }
 127
 128 static const char *gpio_of_names[] = {
 129         "mod-def0",
 130         "los",
 131         "tx-fault",
 132         "tx-disable",
 133         "rate-select0",
 134 };
 135
 136 static const enum gpiod_flags gpio_flags[] = {
 137         GPIOD_IN,
 138         GPIOD_IN,
 139         GPIOD_IN,
 140         GPIOD_ASIS,
 141         GPIOD_ASIS,
 142 };
 143
 144 #define T_INIT_JIFFIES  msecs_to_jiffies(300)
 145 #define T_RESET_US      10
 146 #define T_FAULT_RECOVER msecs_to_jiffies(1000)
 147
 148 /* SFP module presence detection is poor: the three MOD DEF signals are
 149  * the same length on the PCB, which means it's possible for MOD DEF 0 to
 150  * connect before the I2C bus on MOD DEF 1/2.
 151  *
 152  * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
 153  * be deasserted) but makes no mention of the earliest time before we can
 154  * access the I2C EEPROM.  However, Avago modules require 300ms.
 155  */
 156 #define T_PROBE_INIT    msecs_to_jiffies(300)
 157 #define T_HPOWER_LEVEL  msecs_to_jiffies(300)
 158 #define T_PROBE_RETRY   msecs_to_jiffies(100)
 159
 160 /* SFP modules appear to always have their PHY configured for bus address
 161  * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
 162  */
 163 #define SFP_PHY_ADDR    22
 164
 165 /* Give this long for the PHY to reset. */
 166 #define T_PHY_RESET_MS  50
 167
 168 struct sff_data {
 169         unsigned int gpios;
 170         bool (*module_supported)(const struct sfp_eeprom_id *id);
 171 };
 172
 173 struct sfp {
 174         struct device *dev;
 175         struct i2c_adapter *i2c;
 176         struct mii_bus *i2c_mii;
 177         struct sfp_bus *sfp_bus;
 178         struct phy_device *mod_phy;
 179         const struct sff_data *type;
 180         u32 max_power_mW;
 181
 182         unsigned int (*get_state)(struct sfp *);
 183         void (*set_state)(struct sfp *, unsigned int);
 184         int (*read)(struct sfp *, bool, u8, void *, size_t);
 185         int (*write)(struct sfp *, bool, u8, void *, size_t);
 186
 187         struct gpio_desc *gpio[GPIO_MAX];
 188         int gpio_irq[GPIO_MAX];
 189
 190         bool attached;
 191         struct mutex st_mutex;                  /* Protects state */
 192         unsigned int state;
 193         struct delayed_work poll;
 194         struct delayed_work timeout;
 195         struct mutex sm_mutex;                  /* Protects state machine */
 196         unsigned char sm_mod_state;
 197         unsigned char sm_dev_state;
 198         unsigned short sm_state;
 199         unsigned int sm_retries;
 200
 201         struct sfp_eeprom_id id;
 202 #if IS_ENABLED(CONFIG_HWMON)
 203         struct sfp_diag diag;
 204         struct device *hwmon_dev;
 205         char *hwmon_name;
 206 #endif
 207
 208 };
 209
 210 static bool sff_module_supported(const struct sfp_eeprom_id *id)
 211 {
 212         return id->base.phys_id == SFP_PHYS_ID_SFF &&
 213                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 214 }
 215
 216 static const struct sff_data sff_data = {
 217         .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
 218         .module_supported = sff_module_supported,
 219 };
 220
 221 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
 222 {
 223         return id->base.phys_id == SFP_PHYS_ID_SFP &&
 224                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 225 }
 226
 227 static const struct sff_data sfp_data = {
 228         .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
 229                  SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
 230         .module_supported = sfp_module_supported,
 231 };
 232
 233 static const struct of_device_id sfp_of_match[] = {
 234         { .compatible = "sff,sff", .data = &sff_data, },
 235         { .compatible = "sff,sfp", .data = &sfp_data, },
 236         { },
 237 };
 238 MODULE_DEVICE_TABLE(of, sfp_of_match);
 239
 240 static unsigned long poll_jiffies;
 241
 242 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
 243 {
 244         unsigned int i, state, v;
 245
 246         for (i = state = 0; i < GPIO_MAX; i++) {
 247                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
 248                         continue;
 249
 250                 v = gpiod_get_value_cansleep(sfp->gpio[i]);
 251                 if (v)
 252                         state |= BIT(i);
 253         }
 254
 255         return state;
 256 }
 257
 258 static unsigned int sff_gpio_get_state(struct sfp *sfp)
 259 {
 260         return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
 261 }
 262
 263 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
 264 {
 265         if (state & SFP_F_PRESENT) {
 266                 /* If the module is present, drive the signals */
 267                 if (sfp->gpio[GPIO_TX_DISABLE])
 268                         gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
 269                                                state & SFP_F_TX_DISABLE);
 270                 if (state & SFP_F_RATE_SELECT)
 271                         gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
 272                                                state & SFP_F_RATE_SELECT);
 273         } else {
 274                 /* Otherwise, let them float to the pull-ups */
 275                 if (sfp->gpio[GPIO_TX_DISABLE])
 276                         gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
 277                 if (state & SFP_F_RATE_SELECT)
 278                         gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
 279         }
 280 }
 281
 282 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 283                         size_t len)
 284 {
 285         struct i2c_msg msgs[2];
 286         u8 bus_addr = a2 ? 0x51 : 0x50;
 287         size_t this_len;
 288         int ret;
 289
 290         msgs[0].addr = bus_addr;
 291         msgs[0].flags = 0;
 292         msgs[0].len = 1;
 293         msgs[0].buf = &dev_addr;
 294         msgs[1].addr = bus_addr;
 295         msgs[1].flags = I2C_M_RD;
 296         msgs[1].len = len;
 297         msgs[1].buf = buf;
 298
 299         while (len) {
 300                 this_len = len;
 301                 if (this_len > 16)
 302                         this_len = 16;
 303
 304                 msgs[1].len = this_len;
 305
 306                 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 307                 if (ret < 0)
 308                         return ret;
 309
 310                 if (ret != ARRAY_SIZE(msgs))
 311                         break;
 312
 313                 msgs[1].buf += this_len;
 314                 dev_addr += this_len;
 315                 len -= this_len;
 316         }
 317
 318         return msgs[1].buf - (u8 *)buf;
 319 }
 320
 321 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 322         size_t len)
 323 {
 324         struct i2c_msg msgs[1];
 325         u8 bus_addr = a2 ? 0x51 : 0x50;
 326         int ret;
 327
 328         msgs[0].addr = bus_addr;
 329         msgs[0].flags = 0;
 330         msgs[0].len = 1 + len;
 331         msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
 332         if (!msgs[0].buf)
 333                 return -ENOMEM;
 334
 335         msgs[0].buf[0] = dev_addr;
 336         memcpy(&msgs[0].buf[1], buf, len);
 337
 338         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 339
 340         kfree(msgs[0].buf);
 341
 342         if (ret < 0)
 343                 return ret;
 344
 345         return ret == ARRAY_SIZE(msgs) ? len : 0;
 346 }
 347
 348 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 349 {
 350         struct mii_bus *i2c_mii;
 351         int ret;
 352
 353         if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 354                 return -EINVAL;
 355
 356         sfp->i2c = i2c;
 357         sfp->read = sfp_i2c_read;
 358         sfp->write = sfp_i2c_write;
 359
 360         i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
 361         if (IS_ERR(i2c_mii))
 362                 return PTR_ERR(i2c_mii);
 363
 364         i2c_mii->name = "SFP I2C Bus";
 365         i2c_mii->phy_mask = ~0;
 366
 367         ret = mdiobus_register(i2c_mii);
 368         if (ret < 0) {
 369                 mdiobus_free(i2c_mii);
 370                 return ret;
 371         }
 372
 373         sfp->i2c_mii = i2c_mii;
 374
 375         return 0;
 376 }
 377
 378 /* Interface */
 379 static unsigned int sfp_get_state(struct sfp *sfp)
 380 {
 381         return sfp->get_state(sfp);
 382 }
 383
 384 static void sfp_set_state(struct sfp *sfp, unsigned int state)
 385 {
 386         sfp->set_state(sfp, state);
 387 }
 388
 389 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 390 {
 391         return sfp->read(sfp, a2, addr, buf, len);
 392 }
 393
 394 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 395 {
 396         return sfp->write(sfp, a2, addr, buf, len);
 397 }
 398
 399 static unsigned int sfp_check(void *buf, size_t len)
 400 {
 401         u8 *p, check;
 402
 403         for (p = buf, check = 0; len; p++, len--)
 404                 check += *p;
 405
 406         return check;
 407 }
 408
 409 /* hwmon */
 410 #if IS_ENABLED(CONFIG_HWMON)
 411 static umode_t sfp_hwmon_is_visible(const void *data,
 412                                     enum hwmon_sensor_types type,
 413                                     u32 attr, int channel)
 414 {
 415         const struct sfp *sfp = data;
 416
 417         switch (type) {
 418         case hwmon_temp:
 419                 switch (attr) {
 420                 case hwmon_temp_min_alarm:
 421                 case hwmon_temp_max_alarm:
 422                 case hwmon_temp_lcrit_alarm:
 423                 case hwmon_temp_crit_alarm:
 424                 case hwmon_temp_min:
 425                 case hwmon_temp_max:
 426                 case hwmon_temp_lcrit:
 427                 case hwmon_temp_crit:
 428                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 429                                 return 0;
 430                         /* fall through */
 431                 case hwmon_temp_input:
 432                         return 0444;
 433                 default:
 434                         return 0;
 435                 }
 436         case hwmon_in:
 437                 switch (attr) {
 438                 case hwmon_in_min_alarm:
 439                 case hwmon_in_max_alarm:
 440                 case hwmon_in_lcrit_alarm:
 441                 case hwmon_in_crit_alarm:
 442                 case hwmon_in_min:
 443                 case hwmon_in_max:
 444                 case hwmon_in_lcrit:
 445                 case hwmon_in_crit:
 446                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 447                                 return 0;
 448                         /* fall through */
 449                 case hwmon_in_input:
 450                         return 0444;
 451                 default:
 452                         return 0;
 453                 }
 454         case hwmon_curr:
 455                 switch (attr) {
 456                 case hwmon_curr_min_alarm:
 457                 case hwmon_curr_max_alarm:
 458                 case hwmon_curr_lcrit_alarm:
 459                 case hwmon_curr_crit_alarm:
 460                 case hwmon_curr_min:
 461                 case hwmon_curr_max:
 462                 case hwmon_curr_lcrit:
 463                 case hwmon_curr_crit:
 464                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 465                                 return 0;
 466                         /* fall through */
 467                 case hwmon_curr_input:
 468                         return 0444;
 469                 default:
 470                         return 0;
 471                 }
 472         case hwmon_power:
 473                 /* External calibration of receive power requires
 474                  * floating point arithmetic. Doing that in the kernel
 475                  * is not easy, so just skip it. If the module does
 476                  * not require external calibration, we can however
 477                  * show receiver power, since FP is then not needed.
 478                  */
 479                 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
 480                     channel == 1)
 481                         return 0;
 482                 switch (attr) {
 483                 case hwmon_power_min_alarm:
 484                 case hwmon_power_max_alarm:
 485                 case hwmon_power_lcrit_alarm:
 486                 case hwmon_power_crit_alarm:
 487                 case hwmon_power_min:
 488                 case hwmon_power_max:
 489                 case hwmon_power_lcrit:
 490                 case hwmon_power_crit:
 491                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 492                                 return 0;
 493                         /* fall through */
 494                 case hwmon_power_input:
 495                         return 0444;
 496                 default:
 497                         return 0;
 498                 }
 499         default:
 500                 return 0;
 501         }
 502 }
 503
 504 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
 505 {
 506         __be16 val;
 507         int err;
 508
 509         err = sfp_read(sfp, true, reg, &val, sizeof(val));
 510         if (err < 0)
 511                 return err;
 512
 513         *value = be16_to_cpu(val);
 514
 515         return 0;
 516 }
 517
 518 static void sfp_hwmon_to_rx_power(long *value)
 519 {
 520         *value = DIV_ROUND_CLOSEST(*value, 100);
 521 }
 522
 523 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
 524                                 long *value)
 525 {
 526         if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
 527                 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
 528 }
 529
 530 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
 531 {
 532         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
 533                             be16_to_cpu(sfp->diag.cal_t_offset), value);
 534
 535         if (*value >= 0x8000)
 536                 *value -= 0x10000;
 537
 538         *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
 539 }
 540
 541 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
 542 {
 543         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
 544                             be16_to_cpu(sfp->diag.cal_v_offset), value);
 545
 546         *value = DIV_ROUND_CLOSEST(*value, 10);
 547 }
 548
 549 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
 550 {
 551         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
 552                             be16_to_cpu(sfp->diag.cal_txi_offset), value);
 553
 554         *value = DIV_ROUND_CLOSEST(*value, 500);
 555 }
 556
 557 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
 558 {
 559         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
 560                             be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
 561
 562         *value = DIV_ROUND_CLOSEST(*value, 10);
 563 }
 564
 565 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
 566 {
 567         int err;
 568
 569         err = sfp_hwmon_read_sensor(sfp, reg, value);
 570         if (err < 0)
 571                 return err;
 572
 573         sfp_hwmon_calibrate_temp(sfp, value);
 574
 575         return 0;
 576 }
 577
 578 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
 579 {
 580         int err;
 581
 582         err = sfp_hwmon_read_sensor(sfp, reg, value);
 583         if (err < 0)
 584                 return err;
 585
 586         sfp_hwmon_calibrate_vcc(sfp, value);
 587
 588         return 0;
 589 }
 590
 591 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
 592 {
 593         int err;
 594
 595         err = sfp_hwmon_read_sensor(sfp, reg, value);
 596         if (err < 0)
 597                 return err;
 598
 599         sfp_hwmon_calibrate_bias(sfp, value);
 600
 601         return 0;
 602 }
 603
 604 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
 605 {
 606         int err;
 607
 608         err = sfp_hwmon_read_sensor(sfp, reg, value);
 609         if (err < 0)
 610                 return err;
 611
 612         sfp_hwmon_calibrate_tx_power(sfp, value);
 613
 614         return 0;
 615 }
 616
 617 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
 618 {
 619         int err;
 620
 621         err = sfp_hwmon_read_sensor(sfp, reg, value);
 622         if (err < 0)
 623                 return err;
 624
 625         sfp_hwmon_to_rx_power(value);
 626
 627         return 0;
 628 }
 629
 630 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
 631 {
 632         u8 status;
 633         int err;
 634
 635         switch (attr) {
 636         case hwmon_temp_input:
 637                 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
 638
 639         case hwmon_temp_lcrit:
 640                 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
 641                 sfp_hwmon_calibrate_temp(sfp, value);
 642                 return 0;
 643
 644         case hwmon_temp_min:
 645                 *value = be16_to_cpu(sfp->diag.temp_low_warn);
 646                 sfp_hwmon_calibrate_temp(sfp, value);
 647                 return 0;
 648         case hwmon_temp_max:
 649                 *value = be16_to_cpu(sfp->diag.temp_high_warn);
 650                 sfp_hwmon_calibrate_temp(sfp, value);
 651                 return 0;
 652
 653         case hwmon_temp_crit:
 654                 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
 655                 sfp_hwmon_calibrate_temp(sfp, value);
 656                 return 0;
 657
 658         case hwmon_temp_lcrit_alarm:
 659                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 660                 if (err < 0)
 661                         return err;
 662
 663                 *value = !!(status & SFP_ALARM0_TEMP_LOW);
 664                 return 0;
 665
 666         case hwmon_temp_min_alarm:
 667                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 668                 if (err < 0)
 669                         return err;
 670
 671                 *value = !!(status & SFP_WARN0_TEMP_LOW);
 672                 return 0;
 673
 674         case hwmon_temp_max_alarm:
 675                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 676                 if (err < 0)
 677                         return err;
 678
 679                 *value = !!(status & SFP_WARN0_TEMP_HIGH);
 680                 return 0;
 681
 682         case hwmon_temp_crit_alarm:
 683                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 684                 if (err < 0)
 685                         return err;
 686
 687                 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
 688                 return 0;
 689         default:
 690                 return -EOPNOTSUPP;
 691         }
 692
 693         return -EOPNOTSUPP;
 694 }
 695
 696 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
 697 {
 698         u8 status;
 699         int err;
 700
 701         switch (attr) {
 702         case hwmon_in_input:
 703                 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
 704
 705         case hwmon_in_lcrit:
 706                 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
 707                 sfp_hwmon_calibrate_vcc(sfp, value);
 708                 return 0;
 709
 710         case hwmon_in_min:
 711                 *value = be16_to_cpu(sfp->diag.volt_low_warn);
 712                 sfp_hwmon_calibrate_vcc(sfp, value);
 713                 return 0;
 714
 715         case hwmon_in_max:
 716                 *value = be16_to_cpu(sfp->diag.volt_high_warn);
 717                 sfp_hwmon_calibrate_vcc(sfp, value);
 718                 return 0;
 719
 720         case hwmon_in_crit:
 721                 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
 722                 sfp_hwmon_calibrate_vcc(sfp, value);
 723                 return 0;
 724
 725         case hwmon_in_lcrit_alarm:
 726                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 727                 if (err < 0)
 728                         return err;
 729
 730                 *value = !!(status & SFP_ALARM0_VCC_LOW);
 731                 return 0;
 732
 733         case hwmon_in_min_alarm:
 734                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 735                 if (err < 0)
 736                         return err;
 737
 738                 *value = !!(status & SFP_WARN0_VCC_LOW);
 739                 return 0;
 740
 741         case hwmon_in_max_alarm:
 742                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 743                 if (err < 0)
 744                         return err;
 745
 746                 *value = !!(status & SFP_WARN0_VCC_HIGH);
 747                 return 0;
 748
 749         case hwmon_in_crit_alarm:
 750                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 751                 if (err < 0)
 752                         return err;
 753
 754                 *value = !!(status & SFP_ALARM0_VCC_HIGH);
 755                 return 0;
 756         default:
 757                 return -EOPNOTSUPP;
 758         }
 759
 760         return -EOPNOTSUPP;
 761 }
 762
 763 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
 764 {
 765         u8 status;
 766         int err;
 767
 768         switch (attr) {
 769         case hwmon_curr_input:
 770                 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
 771
 772         case hwmon_curr_lcrit:
 773                 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
 774                 sfp_hwmon_calibrate_bias(sfp, value);
 775                 return 0;
 776
 777         case hwmon_curr_min:
 778                 *value = be16_to_cpu(sfp->diag.bias_low_warn);
 779                 sfp_hwmon_calibrate_bias(sfp, value);
 780                 return 0;
 781
 782         case hwmon_curr_max:
 783                 *value = be16_to_cpu(sfp->diag.bias_high_warn);
 784                 sfp_hwmon_calibrate_bias(sfp, value);
 785                 return 0;
 786
 787         case hwmon_curr_crit:
 788                 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
 789                 sfp_hwmon_calibrate_bias(sfp, value);
 790                 return 0;
 791
 792         case hwmon_curr_lcrit_alarm:
 793                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 794                 if (err < 0)
 795                         return err;
 796
 797                 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
 798                 return 0;
 799
 800         case hwmon_curr_min_alarm:
 801                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 802                 if (err < 0)
 803                         return err;
 804
 805                 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
 806                 return 0;
 807
 808         case hwmon_curr_max_alarm:
 809                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 810                 if (err < 0)
 811                         return err;
 812
 813                 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
 814                 return 0;
 815
 816         case hwmon_curr_crit_alarm:
 817                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 818                 if (err < 0)
 819                         return err;
 820
 821                 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
 822                 return 0;
 823         default:
 824                 return -EOPNOTSUPP;
 825         }
 826
 827         return -EOPNOTSUPP;
 828 }
 829
 830 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
 831 {
 832         u8 status;
 833         int err;
 834
 835         switch (attr) {
 836         case hwmon_power_input:
 837                 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
 838
 839         case hwmon_power_lcrit:
 840                 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
 841                 sfp_hwmon_calibrate_tx_power(sfp, value);
 842                 return 0;
 843
 844         case hwmon_power_min:
 845                 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
 846                 sfp_hwmon_calibrate_tx_power(sfp, value);
 847                 return 0;
 848
 849         case hwmon_power_max:
 850                 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
 851                 sfp_hwmon_calibrate_tx_power(sfp, value);
 852                 return 0;
 853
 854         case hwmon_power_crit:
 855                 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
 856                 sfp_hwmon_calibrate_tx_power(sfp, value);
 857                 return 0;
 858
 859         case hwmon_power_lcrit_alarm:
 860                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 861                 if (err < 0)
 862                         return err;
 863
 864                 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
 865                 return 0;
 866
 867         case hwmon_power_min_alarm:
 868                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 869                 if (err < 0)
 870                         return err;
 871
 872                 *value = !!(status & SFP_WARN0_TXPWR_LOW);
 873                 return 0;
 874
 875         case hwmon_power_max_alarm:
 876                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 877                 if (err < 0)
 878                         return err;
 879
 880                 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
 881                 return 0;
 882
 883         case hwmon_power_crit_alarm:
 884                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 885                 if (err < 0)
 886                         return err;
 887
 888                 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
 889                 return 0;
 890         default:
 891                 return -EOPNOTSUPP;
 892         }
 893
 894         return -EOPNOTSUPP;
 895 }
 896
 897 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
 898 {
 899         u8 status;
 900         int err;
 901
 902         switch (attr) {
 903         case hwmon_power_input:
 904                 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
 905
 906         case hwmon_power_lcrit:
 907                 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
 908                 sfp_hwmon_to_rx_power(value);
 909                 return 0;
 910
 911         case hwmon_power_min:
 912                 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
 913                 sfp_hwmon_to_rx_power(value);
 914                 return 0;
 915
 916         case hwmon_power_max:
 917                 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
 918                 sfp_hwmon_to_rx_power(value);
 919                 return 0;
 920
 921         case hwmon_power_crit:
 922                 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
 923                 sfp_hwmon_to_rx_power(value);
 924                 return 0;
 925
 926         case hwmon_power_lcrit_alarm:
 927                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
 928                 if (err < 0)
 929                         return err;
 930
 931                 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
 932                 return 0;
 933
 934         case hwmon_power_min_alarm:
 935                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
 936                 if (err < 0)
 937                         return err;
 938
 939                 *value = !!(status & SFP_WARN1_RXPWR_LOW);
 940                 return 0;
 941
 942         case hwmon_power_max_alarm:
 943                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
 944                 if (err < 0)
 945                         return err;
 946
 947                 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
 948                 return 0;
 949
 950         case hwmon_power_crit_alarm:
 951                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
 952                 if (err < 0)
 953                         return err;
 954
 955                 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
 956                 return 0;
 957         default:
 958                 return -EOPNOTSUPP;
 959         }
 960
 961         return -EOPNOTSUPP;
 962 }
 963
 964 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 965                           u32 attr, int channel, long *value)
 966 {
 967         struct sfp *sfp = dev_get_drvdata(dev);
 968
 969         switch (type) {
 970         case hwmon_temp:
 971                 return sfp_hwmon_temp(sfp, attr, value);
 972         case hwmon_in:
 973                 return sfp_hwmon_vcc(sfp, attr, value);
 974         case hwmon_curr:
 975                 return sfp_hwmon_bias(sfp, attr, value);
 976         case hwmon_power:
 977                 switch (channel) {
 978                 case 0:
 979                         return sfp_hwmon_tx_power(sfp, attr, value);
 980                 case 1:
 981                         return sfp_hwmon_rx_power(sfp, attr, value);
 982                 default:
 983                         return -EOPNOTSUPP;
 984                 }
 985         default:
 986                 return -EOPNOTSUPP;
 987         }
 988 }
 989
 990 static const struct hwmon_ops sfp_hwmon_ops = {
 991         .is_visible = sfp_hwmon_is_visible,
 992         .read = sfp_hwmon_read,
 993 };
 994
 995 static u32 sfp_hwmon_chip_config[] = {
 996         HWMON_C_REGISTER_TZ,
 997         0,
 998 };
 999
1000 static const struct hwmon_channel_info sfp_hwmon_chip = {
1001         .type = hwmon_chip,
1002         .config = sfp_hwmon_chip_config,
1003 };
1004
1005 static u32 sfp_hwmon_temp_config[] = {
1006         HWMON_T_INPUT |
1007         HWMON_T_MAX | HWMON_T_MIN |
1008         HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
1009         HWMON_T_CRIT | HWMON_T_LCRIT |
1010         HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM,
1011         0,
1012 };
1013
1014 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
1015         .type = hwmon_temp,
1016         .config = sfp_hwmon_temp_config,
1017 };
1018
1019 static u32 sfp_hwmon_vcc_config[] = {
1020         HWMON_I_INPUT |
1021         HWMON_I_MAX | HWMON_I_MIN |
1022         HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1023         HWMON_I_CRIT | HWMON_I_LCRIT |
1024         HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM,
1025         0,
1026 };
1027
1028 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1029         .type = hwmon_in,
1030         .config = sfp_hwmon_vcc_config,
1031 };
1032
1033 static u32 sfp_hwmon_bias_config[] = {
1034         HWMON_C_INPUT |
1035         HWMON_C_MAX | HWMON_C_MIN |
1036         HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1037         HWMON_C_CRIT | HWMON_C_LCRIT |
1038         HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM,
1039         0,
1040 };
1041
1042 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1043         .type = hwmon_curr,
1044         .config = sfp_hwmon_bias_config,
1045 };
1046
1047 static u32 sfp_hwmon_power_config[] = {
1048         /* Transmit power */
1049         HWMON_P_INPUT |
1050         HWMON_P_MAX | HWMON_P_MIN |
1051         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1052         HWMON_P_CRIT | HWMON_P_LCRIT |
1053         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1054         /* Receive power */
1055         HWMON_P_INPUT |
1056         HWMON_P_MAX | HWMON_P_MIN |
1057         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1058         HWMON_P_CRIT | HWMON_P_LCRIT |
1059         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1060         0,
1061 };
1062
1063 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1064         .type = hwmon_power,
1065         .config = sfp_hwmon_power_config,
1066 };
1067
1068 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1069         &sfp_hwmon_chip,
1070         &sfp_hwmon_vcc_channel_info,
1071         &sfp_hwmon_temp_channel_info,
1072         &sfp_hwmon_bias_channel_info,
1073         &sfp_hwmon_power_channel_info,
1074         NULL,
1075 };
1076
1077 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1078         .ops = &sfp_hwmon_ops,
1079         .info = sfp_hwmon_info,
1080 };
1081
1082 static int sfp_hwmon_insert(struct sfp *sfp)
1083 {
1084         int err, i;
1085
1086         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1087                 return 0;
1088
1089         if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1090                 return 0;
1091
1092         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1093                 /* This driver in general does not support address
1094                  * change.
1095                  */
1096                 return 0;
1097
1098         err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1099         if (err < 0)
1100                 return err;
1101
1102         sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1103         if (!sfp->hwmon_name)
1104                 return -ENODEV;
1105
1106         for (i = 0; sfp->hwmon_name[i]; i++)
1107                 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1108                         sfp->hwmon_name[i] = '_';
1109
1110         sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1111                                                          sfp->hwmon_name, sfp,
1112                                                          &sfp_hwmon_chip_info,
1113                                                          NULL);
1114
1115         return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
1116 }
1117
1118 static void sfp_hwmon_remove(struct sfp *sfp)
1119 {
1120         if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1121                 hwmon_device_unregister(sfp->hwmon_dev);
1122                 sfp->hwmon_dev = NULL;
1123                 kfree(sfp->hwmon_name);
1124         }
1125 }
1126 #else
1127 static int sfp_hwmon_insert(struct sfp *sfp)
1128 {
1129         return 0;
1130 }
1131
1132 static void sfp_hwmon_remove(struct sfp *sfp)
1133 {
1134 }
1135 #endif
1136
1137 /* Helpers */
1138 static void sfp_module_tx_disable(struct sfp *sfp)
1139 {
1140         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1141                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1142         sfp->state |= SFP_F_TX_DISABLE;
1143         sfp_set_state(sfp, sfp->state);
1144 }
1145
1146 static void sfp_module_tx_enable(struct sfp *sfp)
1147 {
1148         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1149                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1150         sfp->state &= ~SFP_F_TX_DISABLE;
1151         sfp_set_state(sfp, sfp->state);
1152 }
1153
1154 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1155 {
1156         unsigned int state = sfp->state;
1157
1158         if (state & SFP_F_TX_DISABLE)
1159                 return;
1160
1161         sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1162
1163         udelay(T_RESET_US);
1164
1165         sfp_set_state(sfp, state);
1166 }
1167
1168 /* SFP state machine */
1169 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1170 {
1171         if (timeout)
1172                 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1173                                  timeout);
1174         else
1175                 cancel_delayed_work(&sfp->timeout);
1176 }
1177
1178 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1179                         unsigned int timeout)
1180 {
1181         sfp->sm_state = state;
1182         sfp_sm_set_timer(sfp, timeout);
1183 }
1184
1185 static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
1186                             unsigned int timeout)
1187 {
1188         sfp->sm_mod_state = state;
1189         sfp_sm_set_timer(sfp, timeout);
1190 }
1191
1192 static void sfp_sm_phy_detach(struct sfp *sfp)
1193 {
1194         phy_stop(sfp->mod_phy);
1195         sfp_remove_phy(sfp->sfp_bus);
1196         phy_device_remove(sfp->mod_phy);
1197         phy_device_free(sfp->mod_phy);
1198         sfp->mod_phy = NULL;
1199 }
1200
1201 static void sfp_sm_probe_phy(struct sfp *sfp)
1202 {
1203         struct phy_device *phy;
1204         int err;
1205
1206         msleep(T_PHY_RESET_MS);
1207
1208         phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
1209         if (phy == ERR_PTR(-ENODEV)) {
1210                 dev_info(sfp->dev, "no PHY detected\n");
1211                 return;
1212         }
1213         if (IS_ERR(phy)) {
1214                 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1215                 return;
1216         }
1217
1218         err = sfp_add_phy(sfp->sfp_bus, phy);
1219         if (err) {
1220                 phy_device_remove(phy);
1221                 phy_device_free(phy);
1222                 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1223                 return;
1224         }
1225
1226         sfp->mod_phy = phy;
1227         phy_start(phy);
1228 }
1229
1230 static void sfp_sm_link_up(struct sfp *sfp)
1231 {
1232         sfp_link_up(sfp->sfp_bus);
1233         sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1234 }
1235
1236 static void sfp_sm_link_down(struct sfp *sfp)
1237 {
1238         sfp_link_down(sfp->sfp_bus);
1239 }
1240
1241 static void sfp_sm_link_check_los(struct sfp *sfp)
1242 {
1243         unsigned int los = sfp->state & SFP_F_LOS;
1244
1245         /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1246          * are set, we assume that no LOS signal is available.
1247          */
1248         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
1249                 los ^= SFP_F_LOS;
1250         else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
1251                 los = 0;
1252
1253         if (los)
1254                 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1255         else
1256                 sfp_sm_link_up(sfp);
1257 }
1258
1259 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1260 {
1261         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1262                 event == SFP_E_LOS_LOW) ||
1263                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1264                 event == SFP_E_LOS_HIGH);
1265 }
1266
1267 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1268 {
1269         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1270                 event == SFP_E_LOS_HIGH) ||
1271                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1272                 event == SFP_E_LOS_LOW);
1273 }
1274
1275 static void sfp_sm_fault(struct sfp *sfp, bool warn)
1276 {
1277         if (sfp->sm_retries && !--sfp->sm_retries) {
1278                 dev_err(sfp->dev,
1279                         "module persistently indicates fault, disabling\n");
1280                 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1281         } else {
1282                 if (warn)
1283                         dev_err(sfp->dev, "module transmit fault indicated\n");
1284
1285                 sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
1286         }
1287 }
1288
1289 static void sfp_sm_mod_init(struct sfp *sfp)
1290 {
1291         sfp_module_tx_enable(sfp);
1292
1293         /* Wait t_init before indicating that the link is up, provided the
1294          * current state indicates no TX_FAULT.  If TX_FAULT clears before
1295          * this time, that's fine too.
1296          */
1297         sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
1298         sfp->sm_retries = 5;
1299
1300         /* Setting the serdes link mode is guesswork: there's no
1301          * field in the EEPROM which indicates what mode should
1302          * be used.
1303          *
1304          * If it's a gigabit-only fiber module, it probably does
1305          * not have a PHY, so switch to 802.3z negotiation mode.
1306          * Otherwise, switch to SGMII mode (which is required to
1307          * support non-gigabit speeds) and probe for a PHY.
1308          */
1309         if (sfp->id.base.e1000_base_t ||
1310             sfp->id.base.e100_base_lx ||
1311             sfp->id.base.e100_base_fx)
1312                 sfp_sm_probe_phy(sfp);
1313 }
1314
1315 static int sfp_sm_mod_hpower(struct sfp *sfp)
1316 {
1317         u32 power;
1318         u8 val;
1319         int err;
1320
1321         power = 1000;
1322         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1323                 power = 1500;
1324         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1325                 power = 2000;
1326
1327         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
1328             (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
1329             SFP_DIAGMON_DDM) {
1330                 /* The module appears not to implement bus address 0xa2,
1331                  * or requires an address change sequence, so assume that
1332                  * the module powers up in the indicated power mode.
1333                  */
1334                 if (power > sfp->max_power_mW) {
1335                         dev_err(sfp->dev,
1336                                 "Host does not support %u.%uW modules\n",
1337                                 power / 1000, (power / 100) % 10);
1338                         return -EINVAL;
1339                 }
1340                 return 0;
1341         }
1342
1343         if (power > sfp->max_power_mW) {
1344                 dev_warn(sfp->dev,
1345                          "Host does not support %u.%uW modules, module left in power mode 1\n",
1346                          power / 1000, (power / 100) % 10);
1347                 return 0;
1348         }
1349
1350         if (power <= 1000)
1351                 return 0;
1352
1353         err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1354         if (err != sizeof(val)) {
1355                 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1356                 err = -EAGAIN;
1357                 goto err;
1358         }
1359
1360         val |= BIT(0);
1361
1362         err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1363         if (err != sizeof(val)) {
1364                 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1365                 err = -EAGAIN;
1366                 goto err;
1367         }
1368
1369         dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1370                  power / 1000, (power / 100) % 10);
1371         return T_HPOWER_LEVEL;
1372
1373 err:
1374         return err;
1375 }
1376
1377 static int sfp_sm_mod_probe(struct sfp *sfp)
1378 {
1379         /* SFP module inserted - read I2C data */
1380         struct sfp_eeprom_id id;
1381         bool cotsworks;
1382         u8 check;
1383         int ret;
1384
1385         ret = sfp_read(sfp, false, 0, &id, sizeof(id));
1386         if (ret < 0) {
1387                 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1388                 return -EAGAIN;
1389         }
1390
1391         if (ret != sizeof(id)) {
1392                 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1393                 return -EAGAIN;
1394         }
1395
1396         /* Cotsworks do not seem to update the checksums when they
1397          * do the final programming with the final module part number,
1398          * serial number and date code.
1399          */
1400         cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
1401
1402         /* Validate the checksum over the base structure */
1403         check = sfp_check(&id.base, sizeof(id.base) - 1);
1404         if (check != id.base.cc_base) {
1405                 if (cotsworks) {
1406                         dev_warn(sfp->dev,
1407                                  "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1408                                  check, id.base.cc_base);
1409                 } else {
1410                         dev_err(sfp->dev,
1411                                 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1412                                 check, id.base.cc_base);
1413                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1414                                        16, 1, &id, sizeof(id), true);
1415                         return -EINVAL;
1416                 }
1417         }
1418
1419         check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1420         if (check != id.ext.cc_ext) {
1421                 if (cotsworks) {
1422                         dev_warn(sfp->dev,
1423                                  "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1424                                  check, id.ext.cc_ext);
1425                 } else {
1426                         dev_err(sfp->dev,
1427                                 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1428                                 check, id.ext.cc_ext);
1429                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1430                                        16, 1, &id, sizeof(id), true);
1431                         memset(&id.ext, 0, sizeof(id.ext));
1432                 }
1433         }
1434
1435         sfp->id = id;
1436
1437         dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1438                  (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1439                  (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1440                  (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1441                  (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1442                  (int)sizeof(id.ext.datecode), id.ext.datecode);
1443
1444         /* Check whether we support this module */
1445         if (!sfp->type->module_supported(&sfp->id)) {
1446                 dev_err(sfp->dev,
1447                         "module is not supported - phys id 0x%02x 0x%02x\n",
1448                         sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1449                 return -EINVAL;
1450         }
1451
1452         /* If the module requires address swap mode, warn about it */
1453         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1454                 dev_warn(sfp->dev,
1455                          "module address swap to access page 0xA2 is not supported.\n");
1456
1457         ret = sfp_hwmon_insert(sfp);
1458         if (ret < 0)
1459                 return ret;
1460
1461         ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
1462         if (ret < 0)
1463                 return ret;
1464
1465         return sfp_sm_mod_hpower(sfp);
1466 }
1467
1468 static void sfp_sm_mod_remove(struct sfp *sfp)
1469 {
1470         sfp_module_remove(sfp->sfp_bus);
1471
1472         sfp_hwmon_remove(sfp);
1473
1474         if (sfp->mod_phy)
1475                 sfp_sm_phy_detach(sfp);
1476
1477         sfp_module_tx_disable(sfp);
1478
1479         memset(&sfp->id, 0, sizeof(sfp->id));
1480
1481         dev_info(sfp->dev, "module removed\n");
1482 }
1483
1484 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
1485 {
1486         mutex_lock(&sfp->sm_mutex);
1487
1488         dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
1489                 mod_state_to_str(sfp->sm_mod_state),
1490                 dev_state_to_str(sfp->sm_dev_state),
1491                 sm_state_to_str(sfp->sm_state),
1492                 event_to_str(event));
1493
1494         /* This state machine tracks the insert/remove state of
1495          * the module, and handles probing the on-board EEPROM.
1496          */
1497         switch (sfp->sm_mod_state) {
1498         default:
1499                 if (event == SFP_E_INSERT && sfp->attached) {
1500                         sfp_module_tx_disable(sfp);
1501                         sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
1502                 }
1503                 break;
1504
1505         case SFP_MOD_PROBE:
1506                 if (event == SFP_E_REMOVE) {
1507                         sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1508                 } else if (event == SFP_E_TIMEOUT) {
1509                         int val = sfp_sm_mod_probe(sfp);
1510
1511                         if (val == 0)
1512                                 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1513                         else if (val > 0)
1514                                 sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
1515                         else if (val != -EAGAIN)
1516                                 sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
1517                         else
1518                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY);
1519                 }
1520                 break;
1521
1522         case SFP_MOD_HPOWER:
1523                 if (event == SFP_E_TIMEOUT) {
1524                         sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1525                         break;
1526                 }
1527                 /* fallthrough */
1528         case SFP_MOD_PRESENT:
1529         case SFP_MOD_ERROR:
1530                 if (event == SFP_E_REMOVE) {
1531                         sfp_sm_mod_remove(sfp);
1532                         sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1533                 }
1534                 break;
1535         }
1536
1537         /* This state machine tracks the netdev up/down state */
1538         switch (sfp->sm_dev_state) {
1539         default:
1540                 if (event == SFP_E_DEV_UP)
1541                         sfp->sm_dev_state = SFP_DEV_UP;
1542                 break;
1543
1544         case SFP_DEV_UP:
1545                 if (event == SFP_E_DEV_DOWN) {
1546                         /* If the module has a PHY, avoid raising TX disable
1547                          * as this resets the PHY. Otherwise, raise it to
1548                          * turn the laser off.
1549                          */
1550                         if (!sfp->mod_phy)
1551                                 sfp_module_tx_disable(sfp);
1552                         sfp->sm_dev_state = SFP_DEV_DOWN;
1553                 }
1554                 break;
1555         }
1556
1557         /* Some events are global */
1558         if (sfp->sm_state != SFP_S_DOWN &&
1559             (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1560              sfp->sm_dev_state != SFP_DEV_UP)) {
1561                 if (sfp->sm_state == SFP_S_LINK_UP &&
1562                     sfp->sm_dev_state == SFP_DEV_UP)
1563                         sfp_sm_link_down(sfp);
1564                 if (sfp->mod_phy)
1565                         sfp_sm_phy_detach(sfp);
1566                 sfp_sm_next(sfp, SFP_S_DOWN, 0);
1567                 mutex_unlock(&sfp->sm_mutex);
1568                 return;
1569         }
1570
1571         /* The main state machine */
1572         switch (sfp->sm_state) {
1573         case SFP_S_DOWN:
1574                 if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
1575                     sfp->sm_dev_state == SFP_DEV_UP)
1576                         sfp_sm_mod_init(sfp);
1577                 break;
1578
1579         case SFP_S_INIT:
1580                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
1581                         sfp_sm_fault(sfp, true);
1582                 else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
1583                         sfp_sm_link_check_los(sfp);
1584                 break;
1585
1586         case SFP_S_WAIT_LOS:
1587                 if (event == SFP_E_TX_FAULT)
1588                         sfp_sm_fault(sfp, true);
1589                 else if (sfp_los_event_inactive(sfp, event))
1590                         sfp_sm_link_up(sfp);
1591                 break;
1592
1593         case SFP_S_LINK_UP:
1594                 if (event == SFP_E_TX_FAULT) {
1595                         sfp_sm_link_down(sfp);
1596                         sfp_sm_fault(sfp, true);
1597                 } else if (sfp_los_event_active(sfp, event)) {
1598                         sfp_sm_link_down(sfp);
1599                         sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1600                 }
1601                 break;
1602
1603         case SFP_S_TX_FAULT:
1604                 if (event == SFP_E_TIMEOUT) {
1605                         sfp_module_tx_fault_reset(sfp);
1606                         sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
1607                 }
1608                 break;
1609
1610         case SFP_S_REINIT:
1611                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
1612                         sfp_sm_fault(sfp, false);
1613                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
1614                         dev_info(sfp->dev, "module transmit fault recovered\n");
1615                         sfp_sm_link_check_los(sfp);
1616                 }
1617                 break;
1618
1619         case SFP_S_TX_DISABLE:
1620                 break;
1621         }
1622
1623         dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
1624                 mod_state_to_str(sfp->sm_mod_state),
1625                 dev_state_to_str(sfp->sm_dev_state),
1626                 sm_state_to_str(sfp->sm_state));
1627
1628         mutex_unlock(&sfp->sm_mutex);
1629 }
1630
1631 static void sfp_attach(struct sfp *sfp)
1632 {
1633         sfp->attached = true;
1634         if (sfp->state & SFP_F_PRESENT)
1635                 sfp_sm_event(sfp, SFP_E_INSERT);
1636 }
1637
1638 static void sfp_detach(struct sfp *sfp)
1639 {
1640         sfp->attached = false;
1641         sfp_sm_event(sfp, SFP_E_REMOVE);
1642 }
1643
1644 static void sfp_start(struct sfp *sfp)
1645 {
1646         sfp_sm_event(sfp, SFP_E_DEV_UP);
1647 }
1648
1649 static void sfp_stop(struct sfp *sfp)
1650 {
1651         sfp_sm_event(sfp, SFP_E_DEV_DOWN);
1652 }
1653
1654 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
1655 {
1656         /* locking... and check module is present */
1657
1658         if (sfp->id.ext.sff8472_compliance &&
1659             !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
1660                 modinfo->type = ETH_MODULE_SFF_8472;
1661                 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
1662         } else {
1663                 modinfo->type = ETH_MODULE_SFF_8079;
1664                 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
1665         }
1666         return 0;
1667 }
1668
1669 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
1670                              u8 *data)
1671 {
1672         unsigned int first, last, len;
1673         int ret;
1674
1675         if (ee->len == 0)
1676                 return -EINVAL;
1677
1678         first = ee->offset;
1679         last = ee->offset + ee->len;
1680         if (first < ETH_MODULE_SFF_8079_LEN) {
1681                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
1682                 len -= first;
1683
1684                 ret = sfp_read(sfp, false, first, data, len);
1685                 if (ret < 0)
1686                         return ret;
1687
1688                 first += len;
1689                 data += len;
1690         }
1691         if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
1692                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
1693                 len -= first;
1694                 first -= ETH_MODULE_SFF_8079_LEN;
1695
1696                 ret = sfp_read(sfp, true, first, data, len);
1697                 if (ret < 0)
1698                         return ret;
1699         }
1700         return 0;
1701 }
1702
1703 static const struct sfp_socket_ops sfp_module_ops = {
1704         .attach = sfp_attach,
1705         .detach = sfp_detach,
1706         .start = sfp_start,
1707         .stop = sfp_stop,
1708         .module_info = sfp_module_info,
1709         .module_eeprom = sfp_module_eeprom,
1710 };
1711
1712 static void sfp_timeout(struct work_struct *work)
1713 {
1714         struct sfp *sfp = container_of(work, struct sfp, timeout.work);
1715
1716         rtnl_lock();
1717         sfp_sm_event(sfp, SFP_E_TIMEOUT);
1718         rtnl_unlock();
1719 }
1720
1721 static void sfp_check_state(struct sfp *sfp)
1722 {
1723         unsigned int state, i, changed;
1724
1725         mutex_lock(&sfp->st_mutex);
1726         state = sfp_get_state(sfp);
1727         changed = state ^ sfp->state;
1728         changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
1729
1730         for (i = 0; i < GPIO_MAX; i++)
1731                 if (changed & BIT(i))
1732                         dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
1733                                 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
1734
1735         state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
1736         sfp->state = state;
1737
1738         rtnl_lock();
1739         if (changed & SFP_F_PRESENT)
1740                 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
1741                                 SFP_E_INSERT : SFP_E_REMOVE);
1742
1743         if (changed & SFP_F_TX_FAULT)
1744                 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
1745                                 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
1746
1747         if (changed & SFP_F_LOS)
1748                 sfp_sm_event(sfp, state & SFP_F_LOS ?
1749                                 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
1750         rtnl_unlock();
1751         mutex_unlock(&sfp->st_mutex);
1752 }
1753
1754 static irqreturn_t sfp_irq(int irq, void *data)
1755 {
1756         struct sfp *sfp = data;
1757
1758         sfp_check_state(sfp);
1759
1760         return IRQ_HANDLED;
1761 }
1762
1763 static void sfp_poll(struct work_struct *work)
1764 {
1765         struct sfp *sfp = container_of(work, struct sfp, poll.work);
1766
1767         sfp_check_state(sfp);
1768         mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1769 }
1770
1771 static struct sfp *sfp_alloc(struct device *dev)
1772 {
1773         struct sfp *sfp;
1774
1775         sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
1776         if (!sfp)
1777                 return ERR_PTR(-ENOMEM);
1778
1779         sfp->dev = dev;
1780
1781         mutex_init(&sfp->sm_mutex);
1782         mutex_init(&sfp->st_mutex);
1783         INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
1784         INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
1785
1786         return sfp;
1787 }
1788
1789 static void sfp_cleanup(void *data)
1790 {
1791         struct sfp *sfp = data;
1792
1793         cancel_delayed_work_sync(&sfp->poll);
1794         cancel_delayed_work_sync(&sfp->timeout);
1795         if (sfp->i2c_mii) {
1796                 mdiobus_unregister(sfp->i2c_mii);
1797                 mdiobus_free(sfp->i2c_mii);
1798         }
1799         if (sfp->i2c)
1800                 i2c_put_adapter(sfp->i2c);
1801         kfree(sfp);
1802 }
1803
1804 static int sfp_probe(struct platform_device *pdev)
1805 {
1806         const struct sff_data *sff;
1807         struct i2c_adapter *i2c;
1808         struct sfp *sfp;
1809         bool poll = false;
1810         int err, i;
1811
1812         sfp = sfp_alloc(&pdev->dev);
1813         if (IS_ERR(sfp))
1814                 return PTR_ERR(sfp);
1815
1816         platform_set_drvdata(pdev, sfp);
1817
1818         err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
1819         if (err < 0)
1820                 return err;
1821
1822         sff = sfp->type = &sfp_data;
1823
1824         if (pdev->dev.of_node) {
1825                 struct device_node *node = pdev->dev.of_node;
1826                 const struct of_device_id *id;
1827                 struct device_node *np;
1828
1829                 id = of_match_node(sfp_of_match, node);
1830                 if (WARN_ON(!id))
1831                         return -EINVAL;
1832
1833                 sff = sfp->type = id->data;
1834
1835                 np = of_parse_phandle(node, "i2c-bus", 0);
1836                 if (!np) {
1837                         dev_err(sfp->dev, "missing 'i2c-bus' property\n");
1838                         return -ENODEV;
1839                 }
1840
1841                 i2c = of_find_i2c_adapter_by_node(np);
1842                 of_node_put(np);
1843         } else if (has_acpi_companion(&pdev->dev)) {
1844                 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
1845                 struct fwnode_handle *fw = acpi_fwnode_handle(adev);
1846                 struct fwnode_reference_args args;
1847                 struct acpi_handle *acpi_handle;
1848                 int ret;
1849
1850                 ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args);
1851                 if (ACPI_FAILURE(ret) || !is_acpi_device_node(args.fwnode)) {
1852                         dev_err(&pdev->dev, "missing 'i2c-bus' property\n");
1853                         return -ENODEV;
1854                 }
1855
1856                 acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode);
1857                 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
1858         } else {
1859                 return -EINVAL;
1860         }
1861
1862         if (!i2c)
1863                 return -EPROBE_DEFER;
1864
1865         err = sfp_i2c_configure(sfp, i2c);
1866         if (err < 0) {
1867                 i2c_put_adapter(i2c);
1868                 return err;
1869         }
1870
1871         for (i = 0; i < GPIO_MAX; i++)
1872                 if (sff->gpios & BIT(i)) {
1873                         sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
1874                                            gpio_of_names[i], gpio_flags[i]);
1875                         if (IS_ERR(sfp->gpio[i]))
1876                                 return PTR_ERR(sfp->gpio[i]);
1877                 }
1878
1879         sfp->get_state = sfp_gpio_get_state;
1880         sfp->set_state = sfp_gpio_set_state;
1881
1882         /* Modules that have no detect signal are always present */
1883         if (!(sfp->gpio[GPIO_MODDEF0]))
1884                 sfp->get_state = sff_gpio_get_state;
1885
1886         device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
1887                                  &sfp->max_power_mW);
1888         if (!sfp->max_power_mW)
1889                 sfp->max_power_mW = 1000;
1890
1891         dev_info(sfp->dev, "Host maximum power %u.%uW\n",
1892                  sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
1893
1894         /* Get the initial state, and always signal TX disable,
1895          * since the network interface will not be up.
1896          */
1897         sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
1898
1899         if (sfp->gpio[GPIO_RATE_SELECT] &&
1900             gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
1901                 sfp->state |= SFP_F_RATE_SELECT;
1902         sfp_set_state(sfp, sfp->state);
1903         sfp_module_tx_disable(sfp);
1904
1905         for (i = 0; i < GPIO_MAX; i++) {
1906                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
1907                         continue;
1908
1909                 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
1910                 if (!sfp->gpio_irq[i]) {
1911                         poll = true;
1912                         continue;
1913                 }
1914
1915                 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
1916                                                 NULL, sfp_irq,
1917                                                 IRQF_ONESHOT |
1918                                                 IRQF_TRIGGER_RISING |
1919                                                 IRQF_TRIGGER_FALLING,
1920                                                 dev_name(sfp->dev), sfp);
1921                 if (err) {
1922                         sfp->gpio_irq[i] = 0;
1923                         poll = true;
1924                 }
1925         }
1926
1927         if (poll)
1928                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1929
1930         /* We could have an issue in cases no Tx disable pin is available or
1931          * wired as modules using a laser as their light source will continue to
1932          * be active when the fiber is removed. This could be a safety issue and
1933          * we should at least warn the user about that.
1934          */
1935         if (!sfp->gpio[GPIO_TX_DISABLE])
1936                 dev_warn(sfp->dev,
1937                          "No tx_disable pin: SFP modules will always be emitting.\n");
1938
1939         sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
1940         if (!sfp->sfp_bus)
1941                 return -ENOMEM;
1942
1943         return 0;
1944 }
1945
1946 static int sfp_remove(struct platform_device *pdev)
1947 {
1948         struct sfp *sfp = platform_get_drvdata(pdev);
1949
1950         sfp_unregister_socket(sfp->sfp_bus);
1951
1952         return 0;
1953 }
1954
1955 static void sfp_shutdown(struct platform_device *pdev)
1956 {
1957         struct sfp *sfp = platform_get_drvdata(pdev);
1958         int i;
1959
1960         for (i = 0; i < GPIO_MAX; i++) {
1961                 if (!sfp->gpio_irq[i])
1962                         continue;
1963
1964                 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp);
1965         }
1966
1967         cancel_delayed_work_sync(&sfp->poll);
1968         cancel_delayed_work_sync(&sfp->timeout);
1969 }
1970
1971 static struct platform_driver sfp_driver = {
1972         .probe = sfp_probe,
1973         .remove = sfp_remove,
1974         .shutdown = sfp_shutdown,
1975         .driver = {
1976                 .name = "sfp",
1977                 .of_match_table = sfp_of_match,
1978         },
1979 };
1980
1981 static int sfp_init(void)
1982 {
1983         poll_jiffies = msecs_to_jiffies(100);
1984
1985         return platform_driver_register(&sfp_driver);
1986 }
1987 module_init(sfp_init);
1988
1989 static void sfp_exit(void)
1990 {
1991         platform_driver_unregister(&sfp_driver);
1992 }
1993 module_exit(sfp_exit);
1994
1995 MODULE_ALIAS("platform:sfp");
1996 MODULE_AUTHOR("Russell King");
1997 MODULE_LICENSE("GPL v2");