drivers/net/phy/sfp.c

   1 #include <linux/ctype.h>
   2 #include <linux/delay.h>
   3 #include <linux/gpio/consumer.h>
   4 #include <linux/hwmon.h>
   5 #include <linux/i2c.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/jiffies.h>
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/of.h>
  11 #include <linux/phy.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/rtnetlink.h>
  14 #include <linux/slab.h>
  15 #include <linux/workqueue.h>
  16
  17 #include "mdio-i2c.h"
  18 #include "sfp.h"
  19 #include "swphy.h"
  20
  21 enum {
  22         GPIO_MODDEF0,
  23         GPIO_LOS,
  24         GPIO_TX_FAULT,
  25         GPIO_TX_DISABLE,
  26         GPIO_RATE_SELECT,
  27         GPIO_MAX,
  28
  29         SFP_F_PRESENT = BIT(GPIO_MODDEF0),
  30         SFP_F_LOS = BIT(GPIO_LOS),
  31         SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
  32         SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
  33         SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
  34
  35         SFP_E_INSERT = 0,
  36         SFP_E_REMOVE,
  37         SFP_E_DEV_DOWN,
  38         SFP_E_DEV_UP,
  39         SFP_E_TX_FAULT,
  40         SFP_E_TX_CLEAR,
  41         SFP_E_LOS_HIGH,
  42         SFP_E_LOS_LOW,
  43         SFP_E_TIMEOUT,
  44
  45         SFP_MOD_EMPTY = 0,
  46         SFP_MOD_PROBE,
  47         SFP_MOD_HPOWER,
  48         SFP_MOD_PRESENT,
  49         SFP_MOD_ERROR,
  50
  51         SFP_DEV_DOWN = 0,
  52         SFP_DEV_UP,
  53
  54         SFP_S_DOWN = 0,
  55         SFP_S_INIT,
  56         SFP_S_WAIT_LOS,
  57         SFP_S_LINK_UP,
  58         SFP_S_TX_FAULT,
  59         SFP_S_REINIT,
  60         SFP_S_TX_DISABLE,
  61 };
  62
  63 static const char  * const mod_state_strings[] = {
  64         [SFP_MOD_EMPTY] = "empty",
  65         [SFP_MOD_PROBE] = "probe",
  66         [SFP_MOD_HPOWER] = "hpower",
  67         [SFP_MOD_PRESENT] = "present",
  68         [SFP_MOD_ERROR] = "error",
  69 };
  70
  71 static const char *mod_state_to_str(unsigned short mod_state)
  72 {
  73         if (mod_state >= ARRAY_SIZE(mod_state_strings))
  74                 return "Unknown module state";
  75         return mod_state_strings[mod_state];
  76 }
  77
  78 static const char * const dev_state_strings[] = {
  79         [SFP_DEV_DOWN] = "down",
  80         [SFP_DEV_UP] = "up",
  81 };
  82
  83 static const char *dev_state_to_str(unsigned short dev_state)
  84 {
  85         if (dev_state >= ARRAY_SIZE(dev_state_strings))
  86                 return "Unknown device state";
  87         return dev_state_strings[dev_state];
  88 }
  89
  90 static const char * const event_strings[] = {
  91         [SFP_E_INSERT] = "insert",
  92         [SFP_E_REMOVE] = "remove",
  93         [SFP_E_DEV_DOWN] = "dev_down",
  94         [SFP_E_DEV_UP] = "dev_up",
  95         [SFP_E_TX_FAULT] = "tx_fault",
  96         [SFP_E_TX_CLEAR] = "tx_clear",
  97         [SFP_E_LOS_HIGH] = "los_high",
  98         [SFP_E_LOS_LOW] = "los_low",
  99         [SFP_E_TIMEOUT] = "timeout",
 100 };
 101
 102 static const char *event_to_str(unsigned short event)
 103 {
 104         if (event >= ARRAY_SIZE(event_strings))
 105                 return "Unknown event";
 106         return event_strings[event];
 107 }
 108
 109 static const char * const sm_state_strings[] = {
 110         [SFP_S_DOWN] = "down",
 111         [SFP_S_INIT] = "init",
 112         [SFP_S_WAIT_LOS] = "wait_los",
 113         [SFP_S_LINK_UP] = "link_up",
 114         [SFP_S_TX_FAULT] = "tx_fault",
 115         [SFP_S_REINIT] = "reinit",
 116         [SFP_S_TX_DISABLE] = "rx_disable",
 117 };
 118
 119 static const char *sm_state_to_str(unsigned short sm_state)
 120 {
 121         if (sm_state >= ARRAY_SIZE(sm_state_strings))
 122                 return "Unknown state";
 123         return sm_state_strings[sm_state];
 124 }
 125
 126 static const char *gpio_of_names[] = {
 127         "mod-def0",
 128         "los",
 129         "tx-fault",
 130         "tx-disable",
 131         "rate-select0",
 132 };
 133
 134 static const enum gpiod_flags gpio_flags[] = {
 135         GPIOD_IN,
 136         GPIOD_IN,
 137         GPIOD_IN,
 138         GPIOD_ASIS,
 139         GPIOD_ASIS,
 140 };
 141
 142 #define T_INIT_JIFFIES  msecs_to_jiffies(300)
 143 #define T_RESET_US      10
 144 #define T_FAULT_RECOVER msecs_to_jiffies(1000)
 145
 146 /* SFP module presence detection is poor: the three MOD DEF signals are
 147  * the same length on the PCB, which means it's possible for MOD DEF 0 to
 148  * connect before the I2C bus on MOD DEF 1/2.
 149  *
 150  * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
 151  * be deasserted) but makes no mention of the earliest time before we can
 152  * access the I2C EEPROM.  However, Avago modules require 300ms.
 153  */
 154 #define T_PROBE_INIT    msecs_to_jiffies(300)
 155 #define T_HPOWER_LEVEL  msecs_to_jiffies(300)
 156 #define T_PROBE_RETRY   msecs_to_jiffies(100)
 157
 158 /* SFP modules appear to always have their PHY configured for bus address
 159  * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
 160  */
 161 #define SFP_PHY_ADDR    22
 162
 163 /* Give this long for the PHY to reset. */
 164 #define T_PHY_RESET_MS  50
 165
 166 struct sff_data {
 167         unsigned int gpios;
 168         bool (*module_supported)(const struct sfp_eeprom_id *id);
 169 };
 170
 171 struct sfp {
 172         struct device *dev;
 173         struct i2c_adapter *i2c;
 174         struct mii_bus *i2c_mii;
 175         struct sfp_bus *sfp_bus;
 176         struct phy_device *mod_phy;
 177         const struct sff_data *type;
 178         u32 max_power_mW;
 179
 180         unsigned int (*get_state)(struct sfp *);
 181         void (*set_state)(struct sfp *, unsigned int);
 182         int (*read)(struct sfp *, bool, u8, void *, size_t);
 183         int (*write)(struct sfp *, bool, u8, void *, size_t);
 184
 185         struct gpio_desc *gpio[GPIO_MAX];
 186
 187         bool attached;
 188         unsigned int state;
 189         struct delayed_work poll;
 190         struct delayed_work timeout;
 191         struct mutex sm_mutex;
 192         unsigned char sm_mod_state;
 193         unsigned char sm_dev_state;
 194         unsigned short sm_state;
 195         unsigned int sm_retries;
 196
 197         struct sfp_eeprom_id id;
 198 #if IS_ENABLED(CONFIG_HWMON)
 199         struct sfp_diag diag;
 200         struct device *hwmon_dev;
 201         char *hwmon_name;
 202 #endif
 203
 204 };
 205
 206 static bool sff_module_supported(const struct sfp_eeprom_id *id)
 207 {
 208         return id->base.phys_id == SFP_PHYS_ID_SFF &&
 209                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 210 }
 211
 212 static const struct sff_data sff_data = {
 213         .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
 214         .module_supported = sff_module_supported,
 215 };
 216
 217 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
 218 {
 219         return id->base.phys_id == SFP_PHYS_ID_SFP &&
 220                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 221 }
 222
 223 static const struct sff_data sfp_data = {
 224         .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
 225                  SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
 226         .module_supported = sfp_module_supported,
 227 };
 228
 229 static const struct of_device_id sfp_of_match[] = {
 230         { .compatible = "sff,sff", .data = &sff_data, },
 231         { .compatible = "sff,sfp", .data = &sfp_data, },
 232         { },
 233 };
 234 MODULE_DEVICE_TABLE(of, sfp_of_match);
 235
 236 static unsigned long poll_jiffies;
 237
 238 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
 239 {
 240         unsigned int i, state, v;
 241
 242         for (i = state = 0; i < GPIO_MAX; i++) {
 243                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
 244                         continue;
 245
 246                 v = gpiod_get_value_cansleep(sfp->gpio[i]);
 247                 if (v)
 248                         state |= BIT(i);
 249         }
 250
 251         return state;
 252 }
 253
 254 static unsigned int sff_gpio_get_state(struct sfp *sfp)
 255 {
 256         return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
 257 }
 258
 259 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
 260 {
 261         if (state & SFP_F_PRESENT) {
 262                 /* If the module is present, drive the signals */
 263                 if (sfp->gpio[GPIO_TX_DISABLE])
 264                         gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
 265                                                state & SFP_F_TX_DISABLE);
 266                 if (state & SFP_F_RATE_SELECT)
 267                         gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
 268                                                state & SFP_F_RATE_SELECT);
 269         } else {
 270                 /* Otherwise, let them float to the pull-ups */
 271                 if (sfp->gpio[GPIO_TX_DISABLE])
 272                         gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
 273                 if (state & SFP_F_RATE_SELECT)
 274                         gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
 275         }
 276 }
 277
 278 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 279                         size_t len)
 280 {
 281         struct i2c_msg msgs[2];
 282         u8 bus_addr = a2 ? 0x51 : 0x50;
 283         int ret;
 284
 285         msgs[0].addr = bus_addr;
 286         msgs[0].flags = 0;
 287         msgs[0].len = 1;
 288         msgs[0].buf = &dev_addr;
 289         msgs[1].addr = bus_addr;
 290         msgs[1].flags = I2C_M_RD;
 291         msgs[1].len = len;
 292         msgs[1].buf = buf;
 293
 294         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 295         if (ret < 0)
 296                 return ret;
 297
 298         return ret == ARRAY_SIZE(msgs) ? len : 0;
 299 }
 300
 301 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 302         size_t len)
 303 {
 304         struct i2c_msg msgs[1];
 305         u8 bus_addr = a2 ? 0x51 : 0x50;
 306         int ret;
 307
 308         msgs[0].addr = bus_addr;
 309         msgs[0].flags = 0;
 310         msgs[0].len = 1 + len;
 311         msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
 312         if (!msgs[0].buf)
 313                 return -ENOMEM;
 314
 315         msgs[0].buf[0] = dev_addr;
 316         memcpy(&msgs[0].buf[1], buf, len);
 317
 318         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 319
 320         kfree(msgs[0].buf);
 321
 322         if (ret < 0)
 323                 return ret;
 324
 325         return ret == ARRAY_SIZE(msgs) ? len : 0;
 326 }
 327
 328 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 329 {
 330         struct mii_bus *i2c_mii;
 331         int ret;
 332
 333         if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 334                 return -EINVAL;
 335
 336         sfp->i2c = i2c;
 337         sfp->read = sfp_i2c_read;
 338         sfp->write = sfp_i2c_write;
 339
 340         i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
 341         if (IS_ERR(i2c_mii))
 342                 return PTR_ERR(i2c_mii);
 343
 344         i2c_mii->name = "SFP I2C Bus";
 345         i2c_mii->phy_mask = ~0;
 346
 347         ret = mdiobus_register(i2c_mii);
 348         if (ret < 0) {
 349                 mdiobus_free(i2c_mii);
 350                 return ret;
 351         }
 352
 353         sfp->i2c_mii = i2c_mii;
 354
 355         return 0;
 356 }
 357
 358 /* Interface */
 359 static unsigned int sfp_get_state(struct sfp *sfp)
 360 {
 361         return sfp->get_state(sfp);
 362 }
 363
 364 static void sfp_set_state(struct sfp *sfp, unsigned int state)
 365 {
 366         sfp->set_state(sfp, state);
 367 }
 368
 369 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 370 {
 371         return sfp->read(sfp, a2, addr, buf, len);
 372 }
 373
 374 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 375 {
 376         return sfp->write(sfp, a2, addr, buf, len);
 377 }
 378
 379 static unsigned int sfp_check(void *buf, size_t len)
 380 {
 381         u8 *p, check;
 382
 383         for (p = buf, check = 0; len; p++, len--)
 384                 check += *p;
 385
 386         return check;
 387 }
 388
 389 /* hwmon */
 390 #if IS_ENABLED(CONFIG_HWMON)
 391 static umode_t sfp_hwmon_is_visible(const void *data,
 392                                     enum hwmon_sensor_types type,
 393                                     u32 attr, int channel)
 394 {
 395         const struct sfp *sfp = data;
 396
 397         switch (type) {
 398         case hwmon_temp:
 399                 switch (attr) {
 400                 case hwmon_temp_min_alarm:
 401                 case hwmon_temp_max_alarm:
 402                 case hwmon_temp_lcrit_alarm:
 403                 case hwmon_temp_crit_alarm:
 404                 case hwmon_temp_min:
 405                 case hwmon_temp_max:
 406                 case hwmon_temp_lcrit:
 407                 case hwmon_temp_crit:
 408                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 409                                 return 0;
 410                         /* fall through */
 411                 case hwmon_temp_input:
 412                         return 0444;
 413                 default:
 414                         return 0;
 415                 }
 416         case hwmon_in:
 417                 switch (attr) {
 418                 case hwmon_in_min_alarm:
 419                 case hwmon_in_max_alarm:
 420                 case hwmon_in_lcrit_alarm:
 421                 case hwmon_in_crit_alarm:
 422                 case hwmon_in_min:
 423                 case hwmon_in_max:
 424                 case hwmon_in_lcrit:
 425                 case hwmon_in_crit:
 426                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 427                                 return 0;
 428                         /* fall through */
 429                 case hwmon_in_input:
 430                         return 0444;
 431                 default:
 432                         return 0;
 433                 }
 434         case hwmon_curr:
 435                 switch (attr) {
 436                 case hwmon_curr_min_alarm:
 437                 case hwmon_curr_max_alarm:
 438                 case hwmon_curr_lcrit_alarm:
 439                 case hwmon_curr_crit_alarm:
 440                 case hwmon_curr_min:
 441                 case hwmon_curr_max:
 442                 case hwmon_curr_lcrit:
 443                 case hwmon_curr_crit:
 444                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 445                                 return 0;
 446                         /* fall through */
 447                 case hwmon_curr_input:
 448                         return 0444;
 449                 default:
 450                         return 0;
 451                 }
 452         case hwmon_power:
 453                 /* External calibration of receive power requires
 454                  * floating point arithmetic. Doing that in the kernel
 455                  * is not easy, so just skip it. If the module does
 456                  * not require external calibration, we can however
 457                  * show receiver power, since FP is then not needed.
 458                  */
 459                 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
 460                     channel == 1)
 461                         return 0;
 462                 switch (attr) {
 463                 case hwmon_power_min_alarm:
 464                 case hwmon_power_max_alarm:
 465                 case hwmon_power_lcrit_alarm:
 466                 case hwmon_power_crit_alarm:
 467                 case hwmon_power_min:
 468                 case hwmon_power_max:
 469                 case hwmon_power_lcrit:
 470                 case hwmon_power_crit:
 471                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 472                                 return 0;
 473                         /* fall through */
 474                 case hwmon_power_input:
 475                         return 0444;
 476                 default:
 477                         return 0;
 478                 }
 479         default:
 480                 return 0;
 481         }
 482 }
 483
 484 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
 485 {
 486         __be16 val;
 487         int err;
 488
 489         err = sfp_read(sfp, true, reg, &val, sizeof(val));
 490         if (err < 0)
 491                 return err;
 492
 493         *value = be16_to_cpu(val);
 494
 495         return 0;
 496 }
 497
 498 static void sfp_hwmon_to_rx_power(long *value)
 499 {
 500         *value = DIV_ROUND_CLOSEST(*value, 100);
 501 }
 502
 503 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
 504                                 long *value)
 505 {
 506         if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
 507                 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
 508 }
 509
 510 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
 511 {
 512         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
 513                             be16_to_cpu(sfp->diag.cal_t_offset), value);
 514
 515         if (*value >= 0x8000)
 516                 *value -= 0x10000;
 517
 518         *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
 519 }
 520
 521 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
 522 {
 523         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
 524                             be16_to_cpu(sfp->diag.cal_v_offset), value);
 525
 526         *value = DIV_ROUND_CLOSEST(*value, 10);
 527 }
 528
 529 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
 530 {
 531         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
 532                             be16_to_cpu(sfp->diag.cal_txi_offset), value);
 533
 534         *value = DIV_ROUND_CLOSEST(*value, 500);
 535 }
 536
 537 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
 538 {
 539         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
 540                             be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
 541
 542         *value = DIV_ROUND_CLOSEST(*value, 10);
 543 }
 544
 545 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
 546 {
 547         int err;
 548
 549         err = sfp_hwmon_read_sensor(sfp, reg, value);
 550         if (err < 0)
 551                 return err;
 552
 553         sfp_hwmon_calibrate_temp(sfp, value);
 554
 555         return 0;
 556 }
 557
 558 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
 559 {
 560         int err;
 561
 562         err = sfp_hwmon_read_sensor(sfp, reg, value);
 563         if (err < 0)
 564                 return err;
 565
 566         sfp_hwmon_calibrate_vcc(sfp, value);
 567
 568         return 0;
 569 }
 570
 571 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
 572 {
 573         int err;
 574
 575         err = sfp_hwmon_read_sensor(sfp, reg, value);
 576         if (err < 0)
 577                 return err;
 578
 579         sfp_hwmon_calibrate_bias(sfp, value);
 580
 581         return 0;
 582 }
 583
 584 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
 585 {
 586         int err;
 587
 588         err = sfp_hwmon_read_sensor(sfp, reg, value);
 589         if (err < 0)
 590                 return err;
 591
 592         sfp_hwmon_calibrate_tx_power(sfp, value);
 593
 594         return 0;
 595 }
 596
 597 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
 598 {
 599         int err;
 600
 601         err = sfp_hwmon_read_sensor(sfp, reg, value);
 602         if (err < 0)
 603                 return err;
 604
 605         sfp_hwmon_to_rx_power(value);
 606
 607         return 0;
 608 }
 609
 610 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
 611 {
 612         u8 status;
 613         int err;
 614
 615         switch (attr) {
 616         case hwmon_temp_input:
 617                 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
 618
 619         case hwmon_temp_lcrit:
 620                 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
 621                 sfp_hwmon_calibrate_temp(sfp, value);
 622                 return 0;
 623
 624         case hwmon_temp_min:
 625                 *value = be16_to_cpu(sfp->diag.temp_low_warn);
 626                 sfp_hwmon_calibrate_temp(sfp, value);
 627                 return 0;
 628         case hwmon_temp_max:
 629                 *value = be16_to_cpu(sfp->diag.temp_high_warn);
 630                 sfp_hwmon_calibrate_temp(sfp, value);
 631                 return 0;
 632
 633         case hwmon_temp_crit:
 634                 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
 635                 sfp_hwmon_calibrate_temp(sfp, value);
 636                 return 0;
 637
 638         case hwmon_temp_lcrit_alarm:
 639                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 640                 if (err < 0)
 641                         return err;
 642
 643                 *value = !!(status & SFP_ALARM0_TEMP_LOW);
 644                 return 0;
 645
 646         case hwmon_temp_min_alarm:
 647                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 648                 if (err < 0)
 649                         return err;
 650
 651                 *value = !!(status & SFP_WARN0_TEMP_LOW);
 652                 return 0;
 653
 654         case hwmon_temp_max_alarm:
 655                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 656                 if (err < 0)
 657                         return err;
 658
 659                 *value = !!(status & SFP_WARN0_TEMP_HIGH);
 660                 return 0;
 661
 662         case hwmon_temp_crit_alarm:
 663                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 664                 if (err < 0)
 665                         return err;
 666
 667                 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
 668                 return 0;
 669         default:
 670                 return -EOPNOTSUPP;
 671         }
 672
 673         return -EOPNOTSUPP;
 674 }
 675
 676 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
 677 {
 678         u8 status;
 679         int err;
 680
 681         switch (attr) {
 682         case hwmon_in_input:
 683                 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
 684
 685         case hwmon_in_lcrit:
 686                 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
 687                 sfp_hwmon_calibrate_vcc(sfp, value);
 688                 return 0;
 689
 690         case hwmon_in_min:
 691                 *value = be16_to_cpu(sfp->diag.volt_low_warn);
 692                 sfp_hwmon_calibrate_vcc(sfp, value);
 693                 return 0;
 694
 695         case hwmon_in_max:
 696                 *value = be16_to_cpu(sfp->diag.volt_high_warn);
 697                 sfp_hwmon_calibrate_vcc(sfp, value);
 698                 return 0;
 699
 700         case hwmon_in_crit:
 701                 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
 702                 sfp_hwmon_calibrate_vcc(sfp, value);
 703                 return 0;
 704
 705         case hwmon_in_lcrit_alarm:
 706                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 707                 if (err < 0)
 708                         return err;
 709
 710                 *value = !!(status & SFP_ALARM0_VCC_LOW);
 711                 return 0;
 712
 713         case hwmon_in_min_alarm:
 714                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 715                 if (err < 0)
 716                         return err;
 717
 718                 *value = !!(status & SFP_WARN0_VCC_LOW);
 719                 return 0;
 720
 721         case hwmon_in_max_alarm:
 722                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 723                 if (err < 0)
 724                         return err;
 725
 726                 *value = !!(status & SFP_WARN0_VCC_HIGH);
 727                 return 0;
 728
 729         case hwmon_in_crit_alarm:
 730                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 731                 if (err < 0)
 732                         return err;
 733
 734                 *value = !!(status & SFP_ALARM0_VCC_HIGH);
 735                 return 0;
 736         default:
 737                 return -EOPNOTSUPP;
 738         }
 739
 740         return -EOPNOTSUPP;
 741 }
 742
 743 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
 744 {
 745         u8 status;
 746         int err;
 747
 748         switch (attr) {
 749         case hwmon_curr_input:
 750                 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
 751
 752         case hwmon_curr_lcrit:
 753                 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
 754                 sfp_hwmon_calibrate_bias(sfp, value);
 755                 return 0;
 756
 757         case hwmon_curr_min:
 758                 *value = be16_to_cpu(sfp->diag.bias_low_warn);
 759                 sfp_hwmon_calibrate_bias(sfp, value);
 760                 return 0;
 761
 762         case hwmon_curr_max:
 763                 *value = be16_to_cpu(sfp->diag.bias_high_warn);
 764                 sfp_hwmon_calibrate_bias(sfp, value);
 765                 return 0;
 766
 767         case hwmon_curr_crit:
 768                 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
 769                 sfp_hwmon_calibrate_bias(sfp, value);
 770                 return 0;
 771
 772         case hwmon_curr_lcrit_alarm:
 773                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 774                 if (err < 0)
 775                         return err;
 776
 777                 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
 778                 return 0;
 779
 780         case hwmon_curr_min_alarm:
 781                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 782                 if (err < 0)
 783                         return err;
 784
 785                 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
 786                 return 0;
 787
 788         case hwmon_curr_max_alarm:
 789                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 790                 if (err < 0)
 791                         return err;
 792
 793                 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
 794                 return 0;
 795
 796         case hwmon_curr_crit_alarm:
 797                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 798                 if (err < 0)
 799                         return err;
 800
 801                 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
 802                 return 0;
 803         default:
 804                 return -EOPNOTSUPP;
 805         }
 806
 807         return -EOPNOTSUPP;
 808 }
 809
 810 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
 811 {
 812         u8 status;
 813         int err;
 814
 815         switch (attr) {
 816         case hwmon_power_input:
 817                 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
 818
 819         case hwmon_power_lcrit:
 820                 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
 821                 sfp_hwmon_calibrate_tx_power(sfp, value);
 822                 return 0;
 823
 824         case hwmon_power_min:
 825                 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
 826                 sfp_hwmon_calibrate_tx_power(sfp, value);
 827                 return 0;
 828
 829         case hwmon_power_max:
 830                 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
 831                 sfp_hwmon_calibrate_tx_power(sfp, value);
 832                 return 0;
 833
 834         case hwmon_power_crit:
 835                 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
 836                 sfp_hwmon_calibrate_tx_power(sfp, value);
 837                 return 0;
 838
 839         case hwmon_power_lcrit_alarm:
 840                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 841                 if (err < 0)
 842                         return err;
 843
 844                 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
 845                 return 0;
 846
 847         case hwmon_power_min_alarm:
 848                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 849                 if (err < 0)
 850                         return err;
 851
 852                 *value = !!(status & SFP_WARN0_TXPWR_LOW);
 853                 return 0;
 854
 855         case hwmon_power_max_alarm:
 856                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 857                 if (err < 0)
 858                         return err;
 859
 860                 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
 861                 return 0;
 862
 863         case hwmon_power_crit_alarm:
 864                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 865                 if (err < 0)
 866                         return err;
 867
 868                 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
 869                 return 0;
 870         default:
 871                 return -EOPNOTSUPP;
 872         }
 873
 874         return -EOPNOTSUPP;
 875 }
 876
 877 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
 878 {
 879         u8 status;
 880         int err;
 881
 882         switch (attr) {
 883         case hwmon_power_input:
 884                 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
 885
 886         case hwmon_power_lcrit:
 887                 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
 888                 sfp_hwmon_to_rx_power(value);
 889                 return 0;
 890
 891         case hwmon_power_min:
 892                 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
 893                 sfp_hwmon_to_rx_power(value);
 894                 return 0;
 895
 896         case hwmon_power_max:
 897                 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
 898                 sfp_hwmon_to_rx_power(value);
 899                 return 0;
 900
 901         case hwmon_power_crit:
 902                 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
 903                 sfp_hwmon_to_rx_power(value);
 904                 return 0;
 905
 906         case hwmon_power_lcrit_alarm:
 907                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
 908                 if (err < 0)
 909                         return err;
 910
 911                 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
 912                 return 0;
 913
 914         case hwmon_power_min_alarm:
 915                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
 916                 if (err < 0)
 917                         return err;
 918
 919                 *value = !!(status & SFP_WARN1_RXPWR_LOW);
 920                 return 0;
 921
 922         case hwmon_power_max_alarm:
 923                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
 924                 if (err < 0)
 925                         return err;
 926
 927                 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
 928                 return 0;
 929
 930         case hwmon_power_crit_alarm:
 931                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
 932                 if (err < 0)
 933                         return err;
 934
 935                 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
 936                 return 0;
 937         default:
 938                 return -EOPNOTSUPP;
 939         }
 940
 941         return -EOPNOTSUPP;
 942 }
 943
 944 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 945                           u32 attr, int channel, long *value)
 946 {
 947         struct sfp *sfp = dev_get_drvdata(dev);
 948
 949         switch (type) {
 950         case hwmon_temp:
 951                 return sfp_hwmon_temp(sfp, attr, value);
 952         case hwmon_in:
 953                 return sfp_hwmon_vcc(sfp, attr, value);
 954         case hwmon_curr:
 955                 return sfp_hwmon_bias(sfp, attr, value);
 956         case hwmon_power:
 957                 switch (channel) {
 958                 case 0:
 959                         return sfp_hwmon_tx_power(sfp, attr, value);
 960                 case 1:
 961                         return sfp_hwmon_rx_power(sfp, attr, value);
 962                 default:
 963                         return -EOPNOTSUPP;
 964                 }
 965         default:
 966                 return -EOPNOTSUPP;
 967         }
 968 }
 969
 970 static const struct hwmon_ops sfp_hwmon_ops = {
 971         .is_visible = sfp_hwmon_is_visible,
 972         .read = sfp_hwmon_read,
 973 };
 974
 975 static u32 sfp_hwmon_chip_config[] = {
 976         HWMON_C_REGISTER_TZ,
 977         0,
 978 };
 979
 980 static const struct hwmon_channel_info sfp_hwmon_chip = {
 981         .type = hwmon_chip,
 982         .config = sfp_hwmon_chip_config,
 983 };
 984
 985 static u32 sfp_hwmon_temp_config[] = {
 986         HWMON_T_INPUT |
 987         HWMON_T_MAX | HWMON_T_MIN |
 988         HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
 989         HWMON_T_CRIT | HWMON_T_LCRIT |
 990         HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM,
 991         0,
 992 };
 993
 994 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
 995         .type = hwmon_temp,
 996         .config = sfp_hwmon_temp_config,
 997 };
 998
 999 static u32 sfp_hwmon_vcc_config[] = {
1000         HWMON_I_INPUT |
1001         HWMON_I_MAX | HWMON_I_MIN |
1002         HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1003         HWMON_I_CRIT | HWMON_I_LCRIT |
1004         HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM,
1005         0,
1006 };
1007
1008 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1009         .type = hwmon_in,
1010         .config = sfp_hwmon_vcc_config,
1011 };
1012
1013 static u32 sfp_hwmon_bias_config[] = {
1014         HWMON_C_INPUT |
1015         HWMON_C_MAX | HWMON_C_MIN |
1016         HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1017         HWMON_C_CRIT | HWMON_C_LCRIT |
1018         HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM,
1019         0,
1020 };
1021
1022 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1023         .type = hwmon_curr,
1024         .config = sfp_hwmon_bias_config,
1025 };
1026
1027 static u32 sfp_hwmon_power_config[] = {
1028         /* Transmit power */
1029         HWMON_P_INPUT |
1030         HWMON_P_MAX | HWMON_P_MIN |
1031         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1032         HWMON_P_CRIT | HWMON_P_LCRIT |
1033         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1034         /* Receive power */
1035         HWMON_P_INPUT |
1036         HWMON_P_MAX | HWMON_P_MIN |
1037         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1038         HWMON_P_CRIT | HWMON_P_LCRIT |
1039         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1040         0,
1041 };
1042
1043 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1044         .type = hwmon_power,
1045         .config = sfp_hwmon_power_config,
1046 };
1047
1048 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1049         &sfp_hwmon_chip,
1050         &sfp_hwmon_vcc_channel_info,
1051         &sfp_hwmon_temp_channel_info,
1052         &sfp_hwmon_bias_channel_info,
1053         &sfp_hwmon_power_channel_info,
1054         NULL,
1055 };
1056
1057 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1058         .ops = &sfp_hwmon_ops,
1059         .info = sfp_hwmon_info,
1060 };
1061
1062 static int sfp_hwmon_insert(struct sfp *sfp)
1063 {
1064         int err, i;
1065
1066         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1067                 return 0;
1068
1069         if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1070                 return 0;
1071
1072         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1073                 /* This driver in general does not support address
1074                  * change.
1075                  */
1076                 return 0;
1077
1078         err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1079         if (err < 0)
1080                 return err;
1081
1082         sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1083         if (!sfp->hwmon_name)
1084                 return -ENODEV;
1085
1086         for (i = 0; sfp->hwmon_name[i]; i++)
1087                 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1088                         sfp->hwmon_name[i] = '_';
1089
1090         sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1091                                                          sfp->hwmon_name, sfp,
1092                                                          &sfp_hwmon_chip_info,
1093                                                          NULL);
1094
1095         return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
1096 }
1097
1098 static void sfp_hwmon_remove(struct sfp *sfp)
1099 {
1100         if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1101                 hwmon_device_unregister(sfp->hwmon_dev);
1102                 sfp->hwmon_dev = NULL;
1103                 kfree(sfp->hwmon_name);
1104         }
1105 }
1106 #else
1107 static int sfp_hwmon_insert(struct sfp *sfp)
1108 {
1109         return 0;
1110 }
1111
1112 static void sfp_hwmon_remove(struct sfp *sfp)
1113 {
1114 }
1115 #endif
1116
1117 /* Helpers */
1118 static void sfp_module_tx_disable(struct sfp *sfp)
1119 {
1120         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1121                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1122         sfp->state |= SFP_F_TX_DISABLE;
1123         sfp_set_state(sfp, sfp->state);
1124 }
1125
1126 static void sfp_module_tx_enable(struct sfp *sfp)
1127 {
1128         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1129                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1130         sfp->state &= ~SFP_F_TX_DISABLE;
1131         sfp_set_state(sfp, sfp->state);
1132 }
1133
1134 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1135 {
1136         unsigned int state = sfp->state;
1137
1138         if (state & SFP_F_TX_DISABLE)
1139                 return;
1140
1141         sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1142
1143         udelay(T_RESET_US);
1144
1145         sfp_set_state(sfp, state);
1146 }
1147
1148 /* SFP state machine */
1149 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1150 {
1151         if (timeout)
1152                 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1153                                  timeout);
1154         else
1155                 cancel_delayed_work(&sfp->timeout);
1156 }
1157
1158 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1159                         unsigned int timeout)
1160 {
1161         sfp->sm_state = state;
1162         sfp_sm_set_timer(sfp, timeout);
1163 }
1164
1165 static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
1166                             unsigned int timeout)
1167 {
1168         sfp->sm_mod_state = state;
1169         sfp_sm_set_timer(sfp, timeout);
1170 }
1171
1172 static void sfp_sm_phy_detach(struct sfp *sfp)
1173 {
1174         phy_stop(sfp->mod_phy);
1175         sfp_remove_phy(sfp->sfp_bus);
1176         phy_device_remove(sfp->mod_phy);
1177         phy_device_free(sfp->mod_phy);
1178         sfp->mod_phy = NULL;
1179 }
1180
1181 static void sfp_sm_probe_phy(struct sfp *sfp)
1182 {
1183         struct phy_device *phy;
1184         int err;
1185
1186         msleep(T_PHY_RESET_MS);
1187
1188         phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
1189         if (phy == ERR_PTR(-ENODEV)) {
1190                 dev_info(sfp->dev, "no PHY detected\n");
1191                 return;
1192         }
1193         if (IS_ERR(phy)) {
1194                 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1195                 return;
1196         }
1197
1198         err = sfp_add_phy(sfp->sfp_bus, phy);
1199         if (err) {
1200                 phy_device_remove(phy);
1201                 phy_device_free(phy);
1202                 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1203                 return;
1204         }
1205
1206         sfp->mod_phy = phy;
1207         phy_start(phy);
1208 }
1209
1210 static void sfp_sm_link_up(struct sfp *sfp)
1211 {
1212         sfp_link_up(sfp->sfp_bus);
1213         sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1214 }
1215
1216 static void sfp_sm_link_down(struct sfp *sfp)
1217 {
1218         sfp_link_down(sfp->sfp_bus);
1219 }
1220
1221 static void sfp_sm_link_check_los(struct sfp *sfp)
1222 {
1223         unsigned int los = sfp->state & SFP_F_LOS;
1224
1225         /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1226          * are set, we assume that no LOS signal is available.
1227          */
1228         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
1229                 los ^= SFP_F_LOS;
1230         else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
1231                 los = 0;
1232
1233         if (los)
1234                 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1235         else
1236                 sfp_sm_link_up(sfp);
1237 }
1238
1239 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1240 {
1241         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1242                 event == SFP_E_LOS_LOW) ||
1243                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1244                 event == SFP_E_LOS_HIGH);
1245 }
1246
1247 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1248 {
1249         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1250                 event == SFP_E_LOS_HIGH) ||
1251                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1252                 event == SFP_E_LOS_LOW);
1253 }
1254
1255 static void sfp_sm_fault(struct sfp *sfp, bool warn)
1256 {
1257         if (sfp->sm_retries && !--sfp->sm_retries) {
1258                 dev_err(sfp->dev,
1259                         "module persistently indicates fault, disabling\n");
1260                 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1261         } else {
1262                 if (warn)
1263                         dev_err(sfp->dev, "module transmit fault indicated\n");
1264
1265                 sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
1266         }
1267 }
1268
1269 static void sfp_sm_mod_init(struct sfp *sfp)
1270 {
1271         sfp_module_tx_enable(sfp);
1272
1273         /* Wait t_init before indicating that the link is up, provided the
1274          * current state indicates no TX_FAULT.  If TX_FAULT clears before
1275          * this time, that's fine too.
1276          */
1277         sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
1278         sfp->sm_retries = 5;
1279
1280         /* Setting the serdes link mode is guesswork: there's no
1281          * field in the EEPROM which indicates what mode should
1282          * be used.
1283          *
1284          * If it's a gigabit-only fiber module, it probably does
1285          * not have a PHY, so switch to 802.3z negotiation mode.
1286          * Otherwise, switch to SGMII mode (which is required to
1287          * support non-gigabit speeds) and probe for a PHY.
1288          */
1289         if (sfp->id.base.e1000_base_t ||
1290             sfp->id.base.e100_base_lx ||
1291             sfp->id.base.e100_base_fx)
1292                 sfp_sm_probe_phy(sfp);
1293 }
1294
1295 static int sfp_sm_mod_hpower(struct sfp *sfp)
1296 {
1297         u32 power;
1298         u8 val;
1299         int err;
1300
1301         power = 1000;
1302         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1303                 power = 1500;
1304         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1305                 power = 2000;
1306
1307         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
1308             (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
1309             SFP_DIAGMON_DDM) {
1310                 /* The module appears not to implement bus address 0xa2,
1311                  * or requires an address change sequence, so assume that
1312                  * the module powers up in the indicated power mode.
1313                  */
1314                 if (power > sfp->max_power_mW) {
1315                         dev_err(sfp->dev,
1316                                 "Host does not support %u.%uW modules\n",
1317                                 power / 1000, (power / 100) % 10);
1318                         return -EINVAL;
1319                 }
1320                 return 0;
1321         }
1322
1323         if (power > sfp->max_power_mW) {
1324                 dev_warn(sfp->dev,
1325                          "Host does not support %u.%uW modules, module left in power mode 1\n",
1326                          power / 1000, (power / 100) % 10);
1327                 return 0;
1328         }
1329
1330         if (power <= 1000)
1331                 return 0;
1332
1333         err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1334         if (err != sizeof(val)) {
1335                 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1336                 err = -EAGAIN;
1337                 goto err;
1338         }
1339
1340         val |= BIT(0);
1341
1342         err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1343         if (err != sizeof(val)) {
1344                 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1345                 err = -EAGAIN;
1346                 goto err;
1347         }
1348
1349         dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1350                  power / 1000, (power / 100) % 10);
1351         return T_HPOWER_LEVEL;
1352
1353 err:
1354         return err;
1355 }
1356
1357 static int sfp_sm_mod_probe(struct sfp *sfp)
1358 {
1359         /* SFP module inserted - read I2C data */
1360         struct sfp_eeprom_id id;
1361         bool cotsworks;
1362         u8 check;
1363         int ret;
1364
1365         ret = sfp_read(sfp, false, 0, &id, sizeof(id));
1366         if (ret < 0) {
1367                 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1368                 return -EAGAIN;
1369         }
1370
1371         if (ret != sizeof(id)) {
1372                 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1373                 return -EAGAIN;
1374         }
1375
1376         /* Cotsworks do not seem to update the checksums when they
1377          * do the final programming with the final module part number,
1378          * serial number and date code.
1379          */
1380         cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
1381
1382         /* Validate the checksum over the base structure */
1383         check = sfp_check(&id.base, sizeof(id.base) - 1);
1384         if (check != id.base.cc_base) {
1385                 if (cotsworks) {
1386                         dev_warn(sfp->dev,
1387                                  "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1388                                  check, id.base.cc_base);
1389                 } else {
1390                         dev_err(sfp->dev,
1391                                 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1392                                 check, id.base.cc_base);
1393                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1394                                        16, 1, &id, sizeof(id), true);
1395                         return -EINVAL;
1396                 }
1397         }
1398
1399         check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1400         if (check != id.ext.cc_ext) {
1401                 if (cotsworks) {
1402                         dev_warn(sfp->dev,
1403                                  "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1404                                  check, id.ext.cc_ext);
1405                 } else {
1406                         dev_err(sfp->dev,
1407                                 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1408                                 check, id.ext.cc_ext);
1409                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1410                                        16, 1, &id, sizeof(id), true);
1411                         memset(&id.ext, 0, sizeof(id.ext));
1412                 }
1413         }
1414
1415         sfp->id = id;
1416
1417         dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1418                  (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1419                  (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1420                  (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1421                  (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1422                  (int)sizeof(id.ext.datecode), id.ext.datecode);
1423
1424         /* Check whether we support this module */
1425         if (!sfp->type->module_supported(&sfp->id)) {
1426                 dev_err(sfp->dev,
1427                         "module is not supported - phys id 0x%02x 0x%02x\n",
1428                         sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1429                 return -EINVAL;
1430         }
1431
1432         /* If the module requires address swap mode, warn about it */
1433         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1434                 dev_warn(sfp->dev,
1435                          "module address swap to access page 0xA2 is not supported.\n");
1436
1437         ret = sfp_hwmon_insert(sfp);
1438         if (ret < 0)
1439                 return ret;
1440
1441         ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
1442         if (ret < 0)
1443                 return ret;
1444
1445         return sfp_sm_mod_hpower(sfp);
1446 }
1447
1448 static void sfp_sm_mod_remove(struct sfp *sfp)
1449 {
1450         sfp_module_remove(sfp->sfp_bus);
1451
1452         sfp_hwmon_remove(sfp);
1453
1454         if (sfp->mod_phy)
1455                 sfp_sm_phy_detach(sfp);
1456
1457         sfp_module_tx_disable(sfp);
1458
1459         memset(&sfp->id, 0, sizeof(sfp->id));
1460
1461         dev_info(sfp->dev, "module removed\n");
1462 }
1463
1464 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
1465 {
1466         mutex_lock(&sfp->sm_mutex);
1467
1468         dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
1469                 mod_state_to_str(sfp->sm_mod_state),
1470                 dev_state_to_str(sfp->sm_dev_state),
1471                 sm_state_to_str(sfp->sm_state),
1472                 event_to_str(event));
1473
1474         /* This state machine tracks the insert/remove state of
1475          * the module, and handles probing the on-board EEPROM.
1476          */
1477         switch (sfp->sm_mod_state) {
1478         default:
1479                 if (event == SFP_E_INSERT && sfp->attached) {
1480                         sfp_module_tx_disable(sfp);
1481                         sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
1482                 }
1483                 break;
1484
1485         case SFP_MOD_PROBE:
1486                 if (event == SFP_E_REMOVE) {
1487                         sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1488                 } else if (event == SFP_E_TIMEOUT) {
1489                         int val = sfp_sm_mod_probe(sfp);
1490
1491                         if (val == 0)
1492                                 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1493                         else if (val > 0)
1494                                 sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
1495                         else if (val != -EAGAIN)
1496                                 sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
1497                         else
1498                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY);
1499                 }
1500                 break;
1501
1502         case SFP_MOD_HPOWER:
1503                 if (event == SFP_E_TIMEOUT) {
1504                         sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1505                         break;
1506                 }
1507                 /* fallthrough */
1508         case SFP_MOD_PRESENT:
1509         case SFP_MOD_ERROR:
1510                 if (event == SFP_E_REMOVE) {
1511                         sfp_sm_mod_remove(sfp);
1512                         sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1513                 }
1514                 break;
1515         }
1516
1517         /* This state machine tracks the netdev up/down state */
1518         switch (sfp->sm_dev_state) {
1519         default:
1520                 if (event == SFP_E_DEV_UP)
1521                         sfp->sm_dev_state = SFP_DEV_UP;
1522                 break;
1523
1524         case SFP_DEV_UP:
1525                 if (event == SFP_E_DEV_DOWN) {
1526                         /* If the module has a PHY, avoid raising TX disable
1527                          * as this resets the PHY. Otherwise, raise it to
1528                          * turn the laser off.
1529                          */
1530                         if (!sfp->mod_phy)
1531                                 sfp_module_tx_disable(sfp);
1532                         sfp->sm_dev_state = SFP_DEV_DOWN;
1533                 }
1534                 break;
1535         }
1536
1537         /* Some events are global */
1538         if (sfp->sm_state != SFP_S_DOWN &&
1539             (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1540              sfp->sm_dev_state != SFP_DEV_UP)) {
1541                 if (sfp->sm_state == SFP_S_LINK_UP &&
1542                     sfp->sm_dev_state == SFP_DEV_UP)
1543                         sfp_sm_link_down(sfp);
1544                 if (sfp->mod_phy)
1545                         sfp_sm_phy_detach(sfp);
1546                 sfp_sm_next(sfp, SFP_S_DOWN, 0);
1547                 mutex_unlock(&sfp->sm_mutex);
1548                 return;
1549         }
1550
1551         /* The main state machine */
1552         switch (sfp->sm_state) {
1553         case SFP_S_DOWN:
1554                 if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
1555                     sfp->sm_dev_state == SFP_DEV_UP)
1556                         sfp_sm_mod_init(sfp);
1557                 break;
1558
1559         case SFP_S_INIT:
1560                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
1561                         sfp_sm_fault(sfp, true);
1562                 else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
1563                         sfp_sm_link_check_los(sfp);
1564                 break;
1565
1566         case SFP_S_WAIT_LOS:
1567                 if (event == SFP_E_TX_FAULT)
1568                         sfp_sm_fault(sfp, true);
1569                 else if (sfp_los_event_inactive(sfp, event))
1570                         sfp_sm_link_up(sfp);
1571                 break;
1572
1573         case SFP_S_LINK_UP:
1574                 if (event == SFP_E_TX_FAULT) {
1575                         sfp_sm_link_down(sfp);
1576                         sfp_sm_fault(sfp, true);
1577                 } else if (sfp_los_event_active(sfp, event)) {
1578                         sfp_sm_link_down(sfp);
1579                         sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1580                 }
1581                 break;
1582
1583         case SFP_S_TX_FAULT:
1584                 if (event == SFP_E_TIMEOUT) {
1585                         sfp_module_tx_fault_reset(sfp);
1586                         sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
1587                 }
1588                 break;
1589
1590         case SFP_S_REINIT:
1591                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
1592                         sfp_sm_fault(sfp, false);
1593                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
1594                         dev_info(sfp->dev, "module transmit fault recovered\n");
1595                         sfp_sm_link_check_los(sfp);
1596                 }
1597                 break;
1598
1599         case SFP_S_TX_DISABLE:
1600                 break;
1601         }
1602
1603         dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
1604                 mod_state_to_str(sfp->sm_mod_state),
1605                 dev_state_to_str(sfp->sm_dev_state),
1606                 sm_state_to_str(sfp->sm_state));
1607
1608         mutex_unlock(&sfp->sm_mutex);
1609 }
1610
1611 static void sfp_attach(struct sfp *sfp)
1612 {
1613         sfp->attached = true;
1614         if (sfp->state & SFP_F_PRESENT)
1615                 sfp_sm_event(sfp, SFP_E_INSERT);
1616 }
1617
1618 static void sfp_detach(struct sfp *sfp)
1619 {
1620         sfp->attached = false;
1621         sfp_sm_event(sfp, SFP_E_REMOVE);
1622 }
1623
1624 static void sfp_start(struct sfp *sfp)
1625 {
1626         sfp_sm_event(sfp, SFP_E_DEV_UP);
1627 }
1628
1629 static void sfp_stop(struct sfp *sfp)
1630 {
1631         sfp_sm_event(sfp, SFP_E_DEV_DOWN);
1632 }
1633
1634 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
1635 {
1636         /* locking... and check module is present */
1637
1638         if (sfp->id.ext.sff8472_compliance &&
1639             !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
1640                 modinfo->type = ETH_MODULE_SFF_8472;
1641                 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
1642         } else {
1643                 modinfo->type = ETH_MODULE_SFF_8079;
1644                 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
1645         }
1646         return 0;
1647 }
1648
1649 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
1650                              u8 *data)
1651 {
1652         unsigned int first, last, len;
1653         int ret;
1654
1655         if (ee->len == 0)
1656                 return -EINVAL;
1657
1658         first = ee->offset;
1659         last = ee->offset + ee->len;
1660         if (first < ETH_MODULE_SFF_8079_LEN) {
1661                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
1662                 len -= first;
1663
1664                 ret = sfp_read(sfp, false, first, data, len);
1665                 if (ret < 0)
1666                         return ret;
1667
1668                 first += len;
1669                 data += len;
1670         }
1671         if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
1672                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
1673                 len -= first;
1674                 first -= ETH_MODULE_SFF_8079_LEN;
1675
1676                 ret = sfp_read(sfp, true, first, data, len);
1677                 if (ret < 0)
1678                         return ret;
1679         }
1680         return 0;
1681 }
1682
1683 static const struct sfp_socket_ops sfp_module_ops = {
1684         .attach = sfp_attach,
1685         .detach = sfp_detach,
1686         .start = sfp_start,
1687         .stop = sfp_stop,
1688         .module_info = sfp_module_info,
1689         .module_eeprom = sfp_module_eeprom,
1690 };
1691
1692 static void sfp_timeout(struct work_struct *work)
1693 {
1694         struct sfp *sfp = container_of(work, struct sfp, timeout.work);
1695
1696         rtnl_lock();
1697         sfp_sm_event(sfp, SFP_E_TIMEOUT);
1698         rtnl_unlock();
1699 }
1700
1701 static void sfp_check_state(struct sfp *sfp)
1702 {
1703         unsigned int state, i, changed;
1704
1705         state = sfp_get_state(sfp);
1706         changed = state ^ sfp->state;
1707         changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
1708
1709         for (i = 0; i < GPIO_MAX; i++)
1710                 if (changed & BIT(i))
1711                         dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
1712                                 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
1713
1714         state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
1715         sfp->state = state;
1716
1717         rtnl_lock();
1718         if (changed & SFP_F_PRESENT)
1719                 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
1720                                 SFP_E_INSERT : SFP_E_REMOVE);
1721
1722         if (changed & SFP_F_TX_FAULT)
1723                 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
1724                                 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
1725
1726         if (changed & SFP_F_LOS)
1727                 sfp_sm_event(sfp, state & SFP_F_LOS ?
1728                                 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
1729         rtnl_unlock();
1730 }
1731
1732 static irqreturn_t sfp_irq(int irq, void *data)
1733 {
1734         struct sfp *sfp = data;
1735
1736         sfp_check_state(sfp);
1737
1738         return IRQ_HANDLED;
1739 }
1740
1741 static void sfp_poll(struct work_struct *work)
1742 {
1743         struct sfp *sfp = container_of(work, struct sfp, poll.work);
1744
1745         sfp_check_state(sfp);
1746         mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1747 }
1748
1749 static struct sfp *sfp_alloc(struct device *dev)
1750 {
1751         struct sfp *sfp;
1752
1753         sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
1754         if (!sfp)
1755                 return ERR_PTR(-ENOMEM);
1756
1757         sfp->dev = dev;
1758
1759         mutex_init(&sfp->sm_mutex);
1760         INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
1761         INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
1762
1763         return sfp;
1764 }
1765
1766 static void sfp_cleanup(void *data)
1767 {
1768         struct sfp *sfp = data;
1769
1770         cancel_delayed_work_sync(&sfp->poll);
1771         cancel_delayed_work_sync(&sfp->timeout);
1772         if (sfp->i2c_mii) {
1773                 mdiobus_unregister(sfp->i2c_mii);
1774                 mdiobus_free(sfp->i2c_mii);
1775         }
1776         if (sfp->i2c)
1777                 i2c_put_adapter(sfp->i2c);
1778         kfree(sfp);
1779 }
1780
1781 static int sfp_probe(struct platform_device *pdev)
1782 {
1783         const struct sff_data *sff;
1784         struct sfp *sfp;
1785         bool poll = false;
1786         int irq, err, i;
1787
1788         sfp = sfp_alloc(&pdev->dev);
1789         if (IS_ERR(sfp))
1790                 return PTR_ERR(sfp);
1791
1792         platform_set_drvdata(pdev, sfp);
1793
1794         err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
1795         if (err < 0)
1796                 return err;
1797
1798         sff = sfp->type = &sfp_data;
1799
1800         if (pdev->dev.of_node) {
1801                 struct device_node *node = pdev->dev.of_node;
1802                 const struct of_device_id *id;
1803                 struct i2c_adapter *i2c;
1804                 struct device_node *np;
1805
1806                 id = of_match_node(sfp_of_match, node);
1807                 if (WARN_ON(!id))
1808                         return -EINVAL;
1809
1810                 sff = sfp->type = id->data;
1811
1812                 np = of_parse_phandle(node, "i2c-bus", 0);
1813                 if (!np) {
1814                         dev_err(sfp->dev, "missing 'i2c-bus' property\n");
1815                         return -ENODEV;
1816                 }
1817
1818                 i2c = of_find_i2c_adapter_by_node(np);
1819                 of_node_put(np);
1820                 if (!i2c)
1821                         return -EPROBE_DEFER;
1822
1823                 err = sfp_i2c_configure(sfp, i2c);
1824                 if (err < 0) {
1825                         i2c_put_adapter(i2c);
1826                         return err;
1827                 }
1828         }
1829
1830         for (i = 0; i < GPIO_MAX; i++)
1831                 if (sff->gpios & BIT(i)) {
1832                         sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
1833                                            gpio_of_names[i], gpio_flags[i]);
1834                         if (IS_ERR(sfp->gpio[i]))
1835                                 return PTR_ERR(sfp->gpio[i]);
1836                 }
1837
1838         sfp->get_state = sfp_gpio_get_state;
1839         sfp->set_state = sfp_gpio_set_state;
1840
1841         /* Modules that have no detect signal are always present */
1842         if (!(sfp->gpio[GPIO_MODDEF0]))
1843                 sfp->get_state = sff_gpio_get_state;
1844
1845         device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
1846                                  &sfp->max_power_mW);
1847         if (!sfp->max_power_mW)
1848                 sfp->max_power_mW = 1000;
1849
1850         dev_info(sfp->dev, "Host maximum power %u.%uW\n",
1851                  sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
1852
1853         /* Get the initial state, and always signal TX disable,
1854          * since the network interface will not be up.
1855          */
1856         sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
1857
1858         if (sfp->gpio[GPIO_RATE_SELECT] &&
1859             gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
1860                 sfp->state |= SFP_F_RATE_SELECT;
1861         sfp_set_state(sfp, sfp->state);
1862         sfp_module_tx_disable(sfp);
1863
1864         for (i = 0; i < GPIO_MAX; i++) {
1865                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
1866                         continue;
1867
1868                 irq = gpiod_to_irq(sfp->gpio[i]);
1869                 if (!irq) {
1870                         poll = true;
1871                         continue;
1872                 }
1873
1874                 err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq,
1875                                                 IRQF_ONESHOT |
1876                                                 IRQF_TRIGGER_RISING |
1877                                                 IRQF_TRIGGER_FALLING,
1878                                                 dev_name(sfp->dev), sfp);
1879                 if (err)
1880                         poll = true;
1881         }
1882
1883         if (poll)
1884                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1885
1886         /* We could have an issue in cases no Tx disable pin is available or
1887          * wired as modules using a laser as their light source will continue to
1888          * be active when the fiber is removed. This could be a safety issue and
1889          * we should at least warn the user about that.
1890          */
1891         if (!sfp->gpio[GPIO_TX_DISABLE])
1892                 dev_warn(sfp->dev,
1893                          "No tx_disable pin: SFP modules will always be emitting.\n");
1894
1895         sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
1896         if (!sfp->sfp_bus)
1897                 return -ENOMEM;
1898
1899         return 0;
1900 }
1901
1902 static int sfp_remove(struct platform_device *pdev)
1903 {
1904         struct sfp *sfp = platform_get_drvdata(pdev);
1905
1906         sfp_unregister_socket(sfp->sfp_bus);
1907
1908         return 0;
1909 }
1910
1911 static struct platform_driver sfp_driver = {
1912         .probe = sfp_probe,
1913         .remove = sfp_remove,
1914         .driver = {
1915                 .name = "sfp",
1916                 .of_match_table = sfp_of_match,
1917         },
1918 };
1919
1920 static int sfp_init(void)
1921 {
1922         poll_jiffies = msecs_to_jiffies(100);
1923
1924         return platform_driver_register(&sfp_driver);
1925 }
1926 module_init(sfp_init);
1927
1928 static void sfp_exit(void)
1929 {
1930         platform_driver_unregister(&sfp_driver);
1931 }
1932 module_exit(sfp_exit);
1933
1934 MODULE_ALIAS("platform:sfp");
1935 MODULE_AUTHOR("Russell King");
1936 MODULE_LICENSE("GPL v2");