drivers/net/phy/sfp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/ctype.h>
   3 #include <linux/delay.h>
   4 #include <linux/gpio/consumer.h>
   5 #include <linux/hwmon.h>
   6 #include <linux/i2c.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/jiffies.h>
   9 #include <linux/module.h>
  10 #include <linux/mutex.h>
  11 #include <linux/of.h>
  12 #include <linux/phy.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/rtnetlink.h>
  15 #include <linux/slab.h>
  16 #include <linux/workqueue.h>
  17
  18 #include "mdio-i2c.h"
  19 #include "sfp.h"
  20 #include "swphy.h"
  21
  22 enum {
  23         GPIO_MODDEF0,
  24         GPIO_LOS,
  25         GPIO_TX_FAULT,
  26         GPIO_TX_DISABLE,
  27         GPIO_RATE_SELECT,
  28         GPIO_MAX,
  29
  30         SFP_F_PRESENT = BIT(GPIO_MODDEF0),
  31         SFP_F_LOS = BIT(GPIO_LOS),
  32         SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
  33         SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
  34         SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
  35
  36         SFP_E_INSERT = 0,
  37         SFP_E_REMOVE,
  38         SFP_E_DEV_DOWN,
  39         SFP_E_DEV_UP,
  40         SFP_E_TX_FAULT,
  41         SFP_E_TX_CLEAR,
  42         SFP_E_LOS_HIGH,
  43         SFP_E_LOS_LOW,
  44         SFP_E_TIMEOUT,
  45
  46         SFP_MOD_EMPTY = 0,
  47         SFP_MOD_PROBE,
  48         SFP_MOD_HPOWER,
  49         SFP_MOD_PRESENT,
  50         SFP_MOD_ERROR,
  51
  52         SFP_DEV_DOWN = 0,
  53         SFP_DEV_UP,
  54
  55         SFP_S_DOWN = 0,
  56         SFP_S_INIT,
  57         SFP_S_WAIT_LOS,
  58         SFP_S_LINK_UP,
  59         SFP_S_TX_FAULT,
  60         SFP_S_REINIT,
  61         SFP_S_TX_DISABLE,
  62 };
  63
  64 static const char  * const mod_state_strings[] = {
  65         [SFP_MOD_EMPTY] = "empty",
  66         [SFP_MOD_PROBE] = "probe",
  67         [SFP_MOD_HPOWER] = "hpower",
  68         [SFP_MOD_PRESENT] = "present",
  69         [SFP_MOD_ERROR] = "error",
  70 };
  71
  72 static const char *mod_state_to_str(unsigned short mod_state)
  73 {
  74         if (mod_state >= ARRAY_SIZE(mod_state_strings))
  75                 return "Unknown module state";
  76         return mod_state_strings[mod_state];
  77 }
  78
  79 static const char * const dev_state_strings[] = {
  80         [SFP_DEV_DOWN] = "down",
  81         [SFP_DEV_UP] = "up",
  82 };
  83
  84 static const char *dev_state_to_str(unsigned short dev_state)
  85 {
  86         if (dev_state >= ARRAY_SIZE(dev_state_strings))
  87                 return "Unknown device state";
  88         return dev_state_strings[dev_state];
  89 }
  90
  91 static const char * const event_strings[] = {
  92         [SFP_E_INSERT] = "insert",
  93         [SFP_E_REMOVE] = "remove",
  94         [SFP_E_DEV_DOWN] = "dev_down",
  95         [SFP_E_DEV_UP] = "dev_up",
  96         [SFP_E_TX_FAULT] = "tx_fault",
  97         [SFP_E_TX_CLEAR] = "tx_clear",
  98         [SFP_E_LOS_HIGH] = "los_high",
  99         [SFP_E_LOS_LOW] = "los_low",
 100         [SFP_E_TIMEOUT] = "timeout",
 101 };
 102
 103 static const char *event_to_str(unsigned short event)
 104 {
 105         if (event >= ARRAY_SIZE(event_strings))
 106                 return "Unknown event";
 107         return event_strings[event];
 108 }
 109
 110 static const char * const sm_state_strings[] = {
 111         [SFP_S_DOWN] = "down",
 112         [SFP_S_INIT] = "init",
 113         [SFP_S_WAIT_LOS] = "wait_los",
 114         [SFP_S_LINK_UP] = "link_up",
 115         [SFP_S_TX_FAULT] = "tx_fault",
 116         [SFP_S_REINIT] = "reinit",
 117         [SFP_S_TX_DISABLE] = "rx_disable",
 118 };
 119
 120 static const char *sm_state_to_str(unsigned short sm_state)
 121 {
 122         if (sm_state >= ARRAY_SIZE(sm_state_strings))
 123                 return "Unknown state";
 124         return sm_state_strings[sm_state];
 125 }
 126
 127 static const char *gpio_of_names[] = {
 128         "mod-def0",
 129         "los",
 130         "tx-fault",
 131         "tx-disable",
 132         "rate-select0",
 133 };
 134
 135 static const enum gpiod_flags gpio_flags[] = {
 136         GPIOD_IN,
 137         GPIOD_IN,
 138         GPIOD_IN,
 139         GPIOD_ASIS,
 140         GPIOD_ASIS,
 141 };
 142
 143 #define T_INIT_JIFFIES  msecs_to_jiffies(300)
 144 #define T_RESET_US      10
 145 #define T_FAULT_RECOVER msecs_to_jiffies(1000)
 146
 147 /* SFP module presence detection is poor: the three MOD DEF signals are
 148  * the same length on the PCB, which means it's possible for MOD DEF 0 to
 149  * connect before the I2C bus on MOD DEF 1/2.
 150  *
 151  * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
 152  * be deasserted) but makes no mention of the earliest time before we can
 153  * access the I2C EEPROM.  However, Avago modules require 300ms.
 154  */
 155 #define T_PROBE_INIT    msecs_to_jiffies(300)
 156 #define T_HPOWER_LEVEL  msecs_to_jiffies(300)
 157 #define T_PROBE_RETRY   msecs_to_jiffies(100)
 158
 159 /* SFP modules appear to always have their PHY configured for bus address
 160  * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
 161  */
 162 #define SFP_PHY_ADDR    22
 163
 164 /* Give this long for the PHY to reset. */
 165 #define T_PHY_RESET_MS  50
 166
 167 struct sff_data {
 168         unsigned int gpios;
 169         bool (*module_supported)(const struct sfp_eeprom_id *id);
 170 };
 171
 172 struct sfp {
 173         struct device *dev;
 174         struct i2c_adapter *i2c;
 175         struct mii_bus *i2c_mii;
 176         struct sfp_bus *sfp_bus;
 177         struct phy_device *mod_phy;
 178         const struct sff_data *type;
 179         u32 max_power_mW;
 180
 181         unsigned int (*get_state)(struct sfp *);
 182         void (*set_state)(struct sfp *, unsigned int);
 183         int (*read)(struct sfp *, bool, u8, void *, size_t);
 184         int (*write)(struct sfp *, bool, u8, void *, size_t);
 185
 186         struct gpio_desc *gpio[GPIO_MAX];
 187
 188         bool attached;
 189         unsigned int state;
 190         struct delayed_work poll;
 191         struct delayed_work timeout;
 192         struct mutex sm_mutex;
 193         unsigned char sm_mod_state;
 194         unsigned char sm_dev_state;
 195         unsigned short sm_state;
 196         unsigned int sm_retries;
 197
 198         struct sfp_eeprom_id id;
 199 #if IS_ENABLED(CONFIG_HWMON)
 200         struct sfp_diag diag;
 201         struct device *hwmon_dev;
 202         char *hwmon_name;
 203 #endif
 204
 205 };
 206
 207 static bool sff_module_supported(const struct sfp_eeprom_id *id)
 208 {
 209         return id->base.phys_id == SFP_PHYS_ID_SFF &&
 210                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 211 }
 212
 213 static const struct sff_data sff_data = {
 214         .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
 215         .module_supported = sff_module_supported,
 216 };
 217
 218 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
 219 {
 220         return id->base.phys_id == SFP_PHYS_ID_SFP &&
 221                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 222 }
 223
 224 static const struct sff_data sfp_data = {
 225         .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
 226                  SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
 227         .module_supported = sfp_module_supported,
 228 };
 229
 230 static const struct of_device_id sfp_of_match[] = {
 231         { .compatible = "sff,sff", .data = &sff_data, },
 232         { .compatible = "sff,sfp", .data = &sfp_data, },
 233         { },
 234 };
 235 MODULE_DEVICE_TABLE(of, sfp_of_match);
 236
 237 static unsigned long poll_jiffies;
 238
 239 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
 240 {
 241         unsigned int i, state, v;
 242
 243         for (i = state = 0; i < GPIO_MAX; i++) {
 244                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
 245                         continue;
 246
 247                 v = gpiod_get_value_cansleep(sfp->gpio[i]);
 248                 if (v)
 249                         state |= BIT(i);
 250         }
 251
 252         return state;
 253 }
 254
 255 static unsigned int sff_gpio_get_state(struct sfp *sfp)
 256 {
 257         return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
 258 }
 259
 260 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
 261 {
 262         if (state & SFP_F_PRESENT) {
 263                 /* If the module is present, drive the signals */
 264                 if (sfp->gpio[GPIO_TX_DISABLE])
 265                         gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
 266                                                state & SFP_F_TX_DISABLE);
 267                 if (state & SFP_F_RATE_SELECT)
 268                         gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
 269                                                state & SFP_F_RATE_SELECT);
 270         } else {
 271                 /* Otherwise, let them float to the pull-ups */
 272                 if (sfp->gpio[GPIO_TX_DISABLE])
 273                         gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
 274                 if (state & SFP_F_RATE_SELECT)
 275                         gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
 276         }
 277 }
 278
 279 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 280                         size_t len)
 281 {
 282         struct i2c_msg msgs[2];
 283         u8 bus_addr = a2 ? 0x51 : 0x50;
 284         int ret;
 285
 286         msgs[0].addr = bus_addr;
 287         msgs[0].flags = 0;
 288         msgs[0].len = 1;
 289         msgs[0].buf = &dev_addr;
 290         msgs[1].addr = bus_addr;
 291         msgs[1].flags = I2C_M_RD;
 292         msgs[1].len = len;
 293         msgs[1].buf = buf;
 294
 295         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 296         if (ret < 0)
 297                 return ret;
 298
 299         return ret == ARRAY_SIZE(msgs) ? len : 0;
 300 }
 301
 302 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 303         size_t len)
 304 {
 305         struct i2c_msg msgs[1];
 306         u8 bus_addr = a2 ? 0x51 : 0x50;
 307         int ret;
 308
 309         msgs[0].addr = bus_addr;
 310         msgs[0].flags = 0;
 311         msgs[0].len = 1 + len;
 312         msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
 313         if (!msgs[0].buf)
 314                 return -ENOMEM;
 315
 316         msgs[0].buf[0] = dev_addr;
 317         memcpy(&msgs[0].buf[1], buf, len);
 318
 319         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 320
 321         kfree(msgs[0].buf);
 322
 323         if (ret < 0)
 324                 return ret;
 325
 326         return ret == ARRAY_SIZE(msgs) ? len : 0;
 327 }
 328
 329 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 330 {
 331         struct mii_bus *i2c_mii;
 332         int ret;
 333
 334         if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 335                 return -EINVAL;
 336
 337         sfp->i2c = i2c;
 338         sfp->read = sfp_i2c_read;
 339         sfp->write = sfp_i2c_write;
 340
 341         i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
 342         if (IS_ERR(i2c_mii))
 343                 return PTR_ERR(i2c_mii);
 344
 345         i2c_mii->name = "SFP I2C Bus";
 346         i2c_mii->phy_mask = ~0;
 347
 348         ret = mdiobus_register(i2c_mii);
 349         if (ret < 0) {
 350                 mdiobus_free(i2c_mii);
 351                 return ret;
 352         }
 353
 354         sfp->i2c_mii = i2c_mii;
 355
 356         return 0;
 357 }
 358
 359 /* Interface */
 360 static unsigned int sfp_get_state(struct sfp *sfp)
 361 {
 362         return sfp->get_state(sfp);
 363 }
 364
 365 static void sfp_set_state(struct sfp *sfp, unsigned int state)
 366 {
 367         sfp->set_state(sfp, state);
 368 }
 369
 370 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 371 {
 372         return sfp->read(sfp, a2, addr, buf, len);
 373 }
 374
 375 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 376 {
 377         return sfp->write(sfp, a2, addr, buf, len);
 378 }
 379
 380 static unsigned int sfp_check(void *buf, size_t len)
 381 {
 382         u8 *p, check;
 383
 384         for (p = buf, check = 0; len; p++, len--)
 385                 check += *p;
 386
 387         return check;
 388 }
 389
 390 /* hwmon */
 391 #if IS_ENABLED(CONFIG_HWMON)
 392 static umode_t sfp_hwmon_is_visible(const void *data,
 393                                     enum hwmon_sensor_types type,
 394                                     u32 attr, int channel)
 395 {
 396         const struct sfp *sfp = data;
 397
 398         switch (type) {
 399         case hwmon_temp:
 400                 switch (attr) {
 401                 case hwmon_temp_min_alarm:
 402                 case hwmon_temp_max_alarm:
 403                 case hwmon_temp_lcrit_alarm:
 404                 case hwmon_temp_crit_alarm:
 405                 case hwmon_temp_min:
 406                 case hwmon_temp_max:
 407                 case hwmon_temp_lcrit:
 408                 case hwmon_temp_crit:
 409                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 410                                 return 0;
 411                         /* fall through */
 412                 case hwmon_temp_input:
 413                         return 0444;
 414                 default:
 415                         return 0;
 416                 }
 417         case hwmon_in:
 418                 switch (attr) {
 419                 case hwmon_in_min_alarm:
 420                 case hwmon_in_max_alarm:
 421                 case hwmon_in_lcrit_alarm:
 422                 case hwmon_in_crit_alarm:
 423                 case hwmon_in_min:
 424                 case hwmon_in_max:
 425                 case hwmon_in_lcrit:
 426                 case hwmon_in_crit:
 427                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 428                                 return 0;
 429                         /* fall through */
 430                 case hwmon_in_input:
 431                         return 0444;
 432                 default:
 433                         return 0;
 434                 }
 435         case hwmon_curr:
 436                 switch (attr) {
 437                 case hwmon_curr_min_alarm:
 438                 case hwmon_curr_max_alarm:
 439                 case hwmon_curr_lcrit_alarm:
 440                 case hwmon_curr_crit_alarm:
 441                 case hwmon_curr_min:
 442                 case hwmon_curr_max:
 443                 case hwmon_curr_lcrit:
 444                 case hwmon_curr_crit:
 445                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 446                                 return 0;
 447                         /* fall through */
 448                 case hwmon_curr_input:
 449                         return 0444;
 450                 default:
 451                         return 0;
 452                 }
 453         case hwmon_power:
 454                 /* External calibration of receive power requires
 455                  * floating point arithmetic. Doing that in the kernel
 456                  * is not easy, so just skip it. If the module does
 457                  * not require external calibration, we can however
 458                  * show receiver power, since FP is then not needed.
 459                  */
 460                 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
 461                     channel == 1)
 462                         return 0;
 463                 switch (attr) {
 464                 case hwmon_power_min_alarm:
 465                 case hwmon_power_max_alarm:
 466                 case hwmon_power_lcrit_alarm:
 467                 case hwmon_power_crit_alarm:
 468                 case hwmon_power_min:
 469                 case hwmon_power_max:
 470                 case hwmon_power_lcrit:
 471                 case hwmon_power_crit:
 472                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 473                                 return 0;
 474                         /* fall through */
 475                 case hwmon_power_input:
 476                         return 0444;
 477                 default:
 478                         return 0;
 479                 }
 480         default:
 481                 return 0;
 482         }
 483 }
 484
 485 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
 486 {
 487         __be16 val;
 488         int err;
 489
 490         err = sfp_read(sfp, true, reg, &val, sizeof(val));
 491         if (err < 0)
 492                 return err;
 493
 494         *value = be16_to_cpu(val);
 495
 496         return 0;
 497 }
 498
 499 static void sfp_hwmon_to_rx_power(long *value)
 500 {
 501         *value = DIV_ROUND_CLOSEST(*value, 100);
 502 }
 503
 504 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
 505                                 long *value)
 506 {
 507         if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
 508                 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
 509 }
 510
 511 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
 512 {
 513         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
 514                             be16_to_cpu(sfp->diag.cal_t_offset), value);
 515
 516         if (*value >= 0x8000)
 517                 *value -= 0x10000;
 518
 519         *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
 520 }
 521
 522 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
 523 {
 524         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
 525                             be16_to_cpu(sfp->diag.cal_v_offset), value);
 526
 527         *value = DIV_ROUND_CLOSEST(*value, 10);
 528 }
 529
 530 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
 531 {
 532         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
 533                             be16_to_cpu(sfp->diag.cal_txi_offset), value);
 534
 535         *value = DIV_ROUND_CLOSEST(*value, 500);
 536 }
 537
 538 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
 539 {
 540         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
 541                             be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
 542
 543         *value = DIV_ROUND_CLOSEST(*value, 10);
 544 }
 545
 546 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
 547 {
 548         int err;
 549
 550         err = sfp_hwmon_read_sensor(sfp, reg, value);
 551         if (err < 0)
 552                 return err;
 553
 554         sfp_hwmon_calibrate_temp(sfp, value);
 555
 556         return 0;
 557 }
 558
 559 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
 560 {
 561         int err;
 562
 563         err = sfp_hwmon_read_sensor(sfp, reg, value);
 564         if (err < 0)
 565                 return err;
 566
 567         sfp_hwmon_calibrate_vcc(sfp, value);
 568
 569         return 0;
 570 }
 571
 572 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
 573 {
 574         int err;
 575
 576         err = sfp_hwmon_read_sensor(sfp, reg, value);
 577         if (err < 0)
 578                 return err;
 579
 580         sfp_hwmon_calibrate_bias(sfp, value);
 581
 582         return 0;
 583 }
 584
 585 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
 586 {
 587         int err;
 588
 589         err = sfp_hwmon_read_sensor(sfp, reg, value);
 590         if (err < 0)
 591                 return err;
 592
 593         sfp_hwmon_calibrate_tx_power(sfp, value);
 594
 595         return 0;
 596 }
 597
 598 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
 599 {
 600         int err;
 601
 602         err = sfp_hwmon_read_sensor(sfp, reg, value);
 603         if (err < 0)
 604                 return err;
 605
 606         sfp_hwmon_to_rx_power(value);
 607
 608         return 0;
 609 }
 610
 611 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
 612 {
 613         u8 status;
 614         int err;
 615
 616         switch (attr) {
 617         case hwmon_temp_input:
 618                 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
 619
 620         case hwmon_temp_lcrit:
 621                 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
 622                 sfp_hwmon_calibrate_temp(sfp, value);
 623                 return 0;
 624
 625         case hwmon_temp_min:
 626                 *value = be16_to_cpu(sfp->diag.temp_low_warn);
 627                 sfp_hwmon_calibrate_temp(sfp, value);
 628                 return 0;
 629         case hwmon_temp_max:
 630                 *value = be16_to_cpu(sfp->diag.temp_high_warn);
 631                 sfp_hwmon_calibrate_temp(sfp, value);
 632                 return 0;
 633
 634         case hwmon_temp_crit:
 635                 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
 636                 sfp_hwmon_calibrate_temp(sfp, value);
 637                 return 0;
 638
 639         case hwmon_temp_lcrit_alarm:
 640                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 641                 if (err < 0)
 642                         return err;
 643
 644                 *value = !!(status & SFP_ALARM0_TEMP_LOW);
 645                 return 0;
 646
 647         case hwmon_temp_min_alarm:
 648                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 649                 if (err < 0)
 650                         return err;
 651
 652                 *value = !!(status & SFP_WARN0_TEMP_LOW);
 653                 return 0;
 654
 655         case hwmon_temp_max_alarm:
 656                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 657                 if (err < 0)
 658                         return err;
 659
 660                 *value = !!(status & SFP_WARN0_TEMP_HIGH);
 661                 return 0;
 662
 663         case hwmon_temp_crit_alarm:
 664                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 665                 if (err < 0)
 666                         return err;
 667
 668                 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
 669                 return 0;
 670         default:
 671                 return -EOPNOTSUPP;
 672         }
 673
 674         return -EOPNOTSUPP;
 675 }
 676
 677 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
 678 {
 679         u8 status;
 680         int err;
 681
 682         switch (attr) {
 683         case hwmon_in_input:
 684                 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
 685
 686         case hwmon_in_lcrit:
 687                 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
 688                 sfp_hwmon_calibrate_vcc(sfp, value);
 689                 return 0;
 690
 691         case hwmon_in_min:
 692                 *value = be16_to_cpu(sfp->diag.volt_low_warn);
 693                 sfp_hwmon_calibrate_vcc(sfp, value);
 694                 return 0;
 695
 696         case hwmon_in_max:
 697                 *value = be16_to_cpu(sfp->diag.volt_high_warn);
 698                 sfp_hwmon_calibrate_vcc(sfp, value);
 699                 return 0;
 700
 701         case hwmon_in_crit:
 702                 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
 703                 sfp_hwmon_calibrate_vcc(sfp, value);
 704                 return 0;
 705
 706         case hwmon_in_lcrit_alarm:
 707                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 708                 if (err < 0)
 709                         return err;
 710
 711                 *value = !!(status & SFP_ALARM0_VCC_LOW);
 712                 return 0;
 713
 714         case hwmon_in_min_alarm:
 715                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 716                 if (err < 0)
 717                         return err;
 718
 719                 *value = !!(status & SFP_WARN0_VCC_LOW);
 720                 return 0;
 721
 722         case hwmon_in_max_alarm:
 723                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 724                 if (err < 0)
 725                         return err;
 726
 727                 *value = !!(status & SFP_WARN0_VCC_HIGH);
 728                 return 0;
 729
 730         case hwmon_in_crit_alarm:
 731                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 732                 if (err < 0)
 733                         return err;
 734
 735                 *value = !!(status & SFP_ALARM0_VCC_HIGH);
 736                 return 0;
 737         default:
 738                 return -EOPNOTSUPP;
 739         }
 740
 741         return -EOPNOTSUPP;
 742 }
 743
 744 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
 745 {
 746         u8 status;
 747         int err;
 748
 749         switch (attr) {
 750         case hwmon_curr_input:
 751                 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
 752
 753         case hwmon_curr_lcrit:
 754                 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
 755                 sfp_hwmon_calibrate_bias(sfp, value);
 756                 return 0;
 757
 758         case hwmon_curr_min:
 759                 *value = be16_to_cpu(sfp->diag.bias_low_warn);
 760                 sfp_hwmon_calibrate_bias(sfp, value);
 761                 return 0;
 762
 763         case hwmon_curr_max:
 764                 *value = be16_to_cpu(sfp->diag.bias_high_warn);
 765                 sfp_hwmon_calibrate_bias(sfp, value);
 766                 return 0;
 767
 768         case hwmon_curr_crit:
 769                 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
 770                 sfp_hwmon_calibrate_bias(sfp, value);
 771                 return 0;
 772
 773         case hwmon_curr_lcrit_alarm:
 774                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 775                 if (err < 0)
 776                         return err;
 777
 778                 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
 779                 return 0;
 780
 781         case hwmon_curr_min_alarm:
 782                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 783                 if (err < 0)
 784                         return err;
 785
 786                 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
 787                 return 0;
 788
 789         case hwmon_curr_max_alarm:
 790                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 791                 if (err < 0)
 792                         return err;
 793
 794                 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
 795                 return 0;
 796
 797         case hwmon_curr_crit_alarm:
 798                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 799                 if (err < 0)
 800                         return err;
 801
 802                 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
 803                 return 0;
 804         default:
 805                 return -EOPNOTSUPP;
 806         }
 807
 808         return -EOPNOTSUPP;
 809 }
 810
 811 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
 812 {
 813         u8 status;
 814         int err;
 815
 816         switch (attr) {
 817         case hwmon_power_input:
 818                 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
 819
 820         case hwmon_power_lcrit:
 821                 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
 822                 sfp_hwmon_calibrate_tx_power(sfp, value);
 823                 return 0;
 824
 825         case hwmon_power_min:
 826                 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
 827                 sfp_hwmon_calibrate_tx_power(sfp, value);
 828                 return 0;
 829
 830         case hwmon_power_max:
 831                 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
 832                 sfp_hwmon_calibrate_tx_power(sfp, value);
 833                 return 0;
 834
 835         case hwmon_power_crit:
 836                 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
 837                 sfp_hwmon_calibrate_tx_power(sfp, value);
 838                 return 0;
 839
 840         case hwmon_power_lcrit_alarm:
 841                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 842                 if (err < 0)
 843                         return err;
 844
 845                 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
 846                 return 0;
 847
 848         case hwmon_power_min_alarm:
 849                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 850                 if (err < 0)
 851                         return err;
 852
 853                 *value = !!(status & SFP_WARN0_TXPWR_LOW);
 854                 return 0;
 855
 856         case hwmon_power_max_alarm:
 857                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 858                 if (err < 0)
 859                         return err;
 860
 861                 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
 862                 return 0;
 863
 864         case hwmon_power_crit_alarm:
 865                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 866                 if (err < 0)
 867                         return err;
 868
 869                 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
 870                 return 0;
 871         default:
 872                 return -EOPNOTSUPP;
 873         }
 874
 875         return -EOPNOTSUPP;
 876 }
 877
 878 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
 879 {
 880         u8 status;
 881         int err;
 882
 883         switch (attr) {
 884         case hwmon_power_input:
 885                 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
 886
 887         case hwmon_power_lcrit:
 888                 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
 889                 sfp_hwmon_to_rx_power(value);
 890                 return 0;
 891
 892         case hwmon_power_min:
 893                 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
 894                 sfp_hwmon_to_rx_power(value);
 895                 return 0;
 896
 897         case hwmon_power_max:
 898                 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
 899                 sfp_hwmon_to_rx_power(value);
 900                 return 0;
 901
 902         case hwmon_power_crit:
 903                 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
 904                 sfp_hwmon_to_rx_power(value);
 905                 return 0;
 906
 907         case hwmon_power_lcrit_alarm:
 908                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
 909                 if (err < 0)
 910                         return err;
 911
 912                 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
 913                 return 0;
 914
 915         case hwmon_power_min_alarm:
 916                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
 917                 if (err < 0)
 918                         return err;
 919
 920                 *value = !!(status & SFP_WARN1_RXPWR_LOW);
 921                 return 0;
 922
 923         case hwmon_power_max_alarm:
 924                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
 925                 if (err < 0)
 926                         return err;
 927
 928                 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
 929                 return 0;
 930
 931         case hwmon_power_crit_alarm:
 932                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
 933                 if (err < 0)
 934                         return err;
 935
 936                 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
 937                 return 0;
 938         default:
 939                 return -EOPNOTSUPP;
 940         }
 941
 942         return -EOPNOTSUPP;
 943 }
 944
 945 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
 946                           u32 attr, int channel, long *value)
 947 {
 948         struct sfp *sfp = dev_get_drvdata(dev);
 949
 950         switch (type) {
 951         case hwmon_temp:
 952                 return sfp_hwmon_temp(sfp, attr, value);
 953         case hwmon_in:
 954                 return sfp_hwmon_vcc(sfp, attr, value);
 955         case hwmon_curr:
 956                 return sfp_hwmon_bias(sfp, attr, value);
 957         case hwmon_power:
 958                 switch (channel) {
 959                 case 0:
 960                         return sfp_hwmon_tx_power(sfp, attr, value);
 961                 case 1:
 962                         return sfp_hwmon_rx_power(sfp, attr, value);
 963                 default:
 964                         return -EOPNOTSUPP;
 965                 }
 966         default:
 967                 return -EOPNOTSUPP;
 968         }
 969 }
 970
 971 static const struct hwmon_ops sfp_hwmon_ops = {
 972         .is_visible = sfp_hwmon_is_visible,
 973         .read = sfp_hwmon_read,
 974 };
 975
 976 static u32 sfp_hwmon_chip_config[] = {
 977         HWMON_C_REGISTER_TZ,
 978         0,
 979 };
 980
 981 static const struct hwmon_channel_info sfp_hwmon_chip = {
 982         .type = hwmon_chip,
 983         .config = sfp_hwmon_chip_config,
 984 };
 985
 986 static u32 sfp_hwmon_temp_config[] = {
 987         HWMON_T_INPUT |
 988         HWMON_T_MAX | HWMON_T_MIN |
 989         HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
 990         HWMON_T_CRIT | HWMON_T_LCRIT |
 991         HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM,
 992         0,
 993 };
 994
 995 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
 996         .type = hwmon_temp,
 997         .config = sfp_hwmon_temp_config,
 998 };
 999
1000 static u32 sfp_hwmon_vcc_config[] = {
1001         HWMON_I_INPUT |
1002         HWMON_I_MAX | HWMON_I_MIN |
1003         HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1004         HWMON_I_CRIT | HWMON_I_LCRIT |
1005         HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM,
1006         0,
1007 };
1008
1009 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1010         .type = hwmon_in,
1011         .config = sfp_hwmon_vcc_config,
1012 };
1013
1014 static u32 sfp_hwmon_bias_config[] = {
1015         HWMON_C_INPUT |
1016         HWMON_C_MAX | HWMON_C_MIN |
1017         HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1018         HWMON_C_CRIT | HWMON_C_LCRIT |
1019         HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM,
1020         0,
1021 };
1022
1023 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1024         .type = hwmon_curr,
1025         .config = sfp_hwmon_bias_config,
1026 };
1027
1028 static u32 sfp_hwmon_power_config[] = {
1029         /* Transmit power */
1030         HWMON_P_INPUT |
1031         HWMON_P_MAX | HWMON_P_MIN |
1032         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1033         HWMON_P_CRIT | HWMON_P_LCRIT |
1034         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1035         /* Receive power */
1036         HWMON_P_INPUT |
1037         HWMON_P_MAX | HWMON_P_MIN |
1038         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1039         HWMON_P_CRIT | HWMON_P_LCRIT |
1040         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1041         0,
1042 };
1043
1044 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1045         .type = hwmon_power,
1046         .config = sfp_hwmon_power_config,
1047 };
1048
1049 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1050         &sfp_hwmon_chip,
1051         &sfp_hwmon_vcc_channel_info,
1052         &sfp_hwmon_temp_channel_info,
1053         &sfp_hwmon_bias_channel_info,
1054         &sfp_hwmon_power_channel_info,
1055         NULL,
1056 };
1057
1058 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1059         .ops = &sfp_hwmon_ops,
1060         .info = sfp_hwmon_info,
1061 };
1062
1063 static int sfp_hwmon_insert(struct sfp *sfp)
1064 {
1065         int err, i;
1066
1067         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1068                 return 0;
1069
1070         if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1071                 return 0;
1072
1073         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1074                 /* This driver in general does not support address
1075                  * change.
1076                  */
1077                 return 0;
1078
1079         err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1080         if (err < 0)
1081                 return err;
1082
1083         sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1084         if (!sfp->hwmon_name)
1085                 return -ENODEV;
1086
1087         for (i = 0; sfp->hwmon_name[i]; i++)
1088                 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1089                         sfp->hwmon_name[i] = '_';
1090
1091         sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1092                                                          sfp->hwmon_name, sfp,
1093                                                          &sfp_hwmon_chip_info,
1094                                                          NULL);
1095
1096         return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
1097 }
1098
1099 static void sfp_hwmon_remove(struct sfp *sfp)
1100 {
1101         if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1102                 hwmon_device_unregister(sfp->hwmon_dev);
1103                 sfp->hwmon_dev = NULL;
1104                 kfree(sfp->hwmon_name);
1105         }
1106 }
1107 #else
1108 static int sfp_hwmon_insert(struct sfp *sfp)
1109 {
1110         return 0;
1111 }
1112
1113 static void sfp_hwmon_remove(struct sfp *sfp)
1114 {
1115 }
1116 #endif
1117
1118 /* Helpers */
1119 static void sfp_module_tx_disable(struct sfp *sfp)
1120 {
1121         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1122                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1123         sfp->state |= SFP_F_TX_DISABLE;
1124         sfp_set_state(sfp, sfp->state);
1125 }
1126
1127 static void sfp_module_tx_enable(struct sfp *sfp)
1128 {
1129         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1130                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1131         sfp->state &= ~SFP_F_TX_DISABLE;
1132         sfp_set_state(sfp, sfp->state);
1133 }
1134
1135 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1136 {
1137         unsigned int state = sfp->state;
1138
1139         if (state & SFP_F_TX_DISABLE)
1140                 return;
1141
1142         sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1143
1144         udelay(T_RESET_US);
1145
1146         sfp_set_state(sfp, state);
1147 }
1148
1149 /* SFP state machine */
1150 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1151 {
1152         if (timeout)
1153                 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1154                                  timeout);
1155         else
1156                 cancel_delayed_work(&sfp->timeout);
1157 }
1158
1159 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1160                         unsigned int timeout)
1161 {
1162         sfp->sm_state = state;
1163         sfp_sm_set_timer(sfp, timeout);
1164 }
1165
1166 static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
1167                             unsigned int timeout)
1168 {
1169         sfp->sm_mod_state = state;
1170         sfp_sm_set_timer(sfp, timeout);
1171 }
1172
1173 static void sfp_sm_phy_detach(struct sfp *sfp)
1174 {
1175         phy_stop(sfp->mod_phy);
1176         sfp_remove_phy(sfp->sfp_bus);
1177         phy_device_remove(sfp->mod_phy);
1178         phy_device_free(sfp->mod_phy);
1179         sfp->mod_phy = NULL;
1180 }
1181
1182 static void sfp_sm_probe_phy(struct sfp *sfp)
1183 {
1184         struct phy_device *phy;
1185         int err;
1186
1187         msleep(T_PHY_RESET_MS);
1188
1189         phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
1190         if (phy == ERR_PTR(-ENODEV)) {
1191                 dev_info(sfp->dev, "no PHY detected\n");
1192                 return;
1193         }
1194         if (IS_ERR(phy)) {
1195                 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1196                 return;
1197         }
1198
1199         err = sfp_add_phy(sfp->sfp_bus, phy);
1200         if (err) {
1201                 phy_device_remove(phy);
1202                 phy_device_free(phy);
1203                 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1204                 return;
1205         }
1206
1207         sfp->mod_phy = phy;
1208         phy_start(phy);
1209 }
1210
1211 static void sfp_sm_link_up(struct sfp *sfp)
1212 {
1213         sfp_link_up(sfp->sfp_bus);
1214         sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1215 }
1216
1217 static void sfp_sm_link_down(struct sfp *sfp)
1218 {
1219         sfp_link_down(sfp->sfp_bus);
1220 }
1221
1222 static void sfp_sm_link_check_los(struct sfp *sfp)
1223 {
1224         unsigned int los = sfp->state & SFP_F_LOS;
1225
1226         /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1227          * are set, we assume that no LOS signal is available.
1228          */
1229         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
1230                 los ^= SFP_F_LOS;
1231         else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
1232                 los = 0;
1233
1234         if (los)
1235                 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1236         else
1237                 sfp_sm_link_up(sfp);
1238 }
1239
1240 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1241 {
1242         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1243                 event == SFP_E_LOS_LOW) ||
1244                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1245                 event == SFP_E_LOS_HIGH);
1246 }
1247
1248 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1249 {
1250         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1251                 event == SFP_E_LOS_HIGH) ||
1252                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1253                 event == SFP_E_LOS_LOW);
1254 }
1255
1256 static void sfp_sm_fault(struct sfp *sfp, bool warn)
1257 {
1258         if (sfp->sm_retries && !--sfp->sm_retries) {
1259                 dev_err(sfp->dev,
1260                         "module persistently indicates fault, disabling\n");
1261                 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1262         } else {
1263                 if (warn)
1264                         dev_err(sfp->dev, "module transmit fault indicated\n");
1265
1266                 sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
1267         }
1268 }
1269
1270 static void sfp_sm_mod_init(struct sfp *sfp)
1271 {
1272         sfp_module_tx_enable(sfp);
1273
1274         /* Wait t_init before indicating that the link is up, provided the
1275          * current state indicates no TX_FAULT.  If TX_FAULT clears before
1276          * this time, that's fine too.
1277          */
1278         sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
1279         sfp->sm_retries = 5;
1280
1281         /* Setting the serdes link mode is guesswork: there's no
1282          * field in the EEPROM which indicates what mode should
1283          * be used.
1284          *
1285          * If it's a gigabit-only fiber module, it probably does
1286          * not have a PHY, so switch to 802.3z negotiation mode.
1287          * Otherwise, switch to SGMII mode (which is required to
1288          * support non-gigabit speeds) and probe for a PHY.
1289          */
1290         if (sfp->id.base.e1000_base_t ||
1291             sfp->id.base.e100_base_lx ||
1292             sfp->id.base.e100_base_fx)
1293                 sfp_sm_probe_phy(sfp);
1294 }
1295
1296 static int sfp_sm_mod_hpower(struct sfp *sfp)
1297 {
1298         u32 power;
1299         u8 val;
1300         int err;
1301
1302         power = 1000;
1303         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1304                 power = 1500;
1305         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1306                 power = 2000;
1307
1308         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
1309             (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
1310             SFP_DIAGMON_DDM) {
1311                 /* The module appears not to implement bus address 0xa2,
1312                  * or requires an address change sequence, so assume that
1313                  * the module powers up in the indicated power mode.
1314                  */
1315                 if (power > sfp->max_power_mW) {
1316                         dev_err(sfp->dev,
1317                                 "Host does not support %u.%uW modules\n",
1318                                 power / 1000, (power / 100) % 10);
1319                         return -EINVAL;
1320                 }
1321                 return 0;
1322         }
1323
1324         if (power > sfp->max_power_mW) {
1325                 dev_warn(sfp->dev,
1326                          "Host does not support %u.%uW modules, module left in power mode 1\n",
1327                          power / 1000, (power / 100) % 10);
1328                 return 0;
1329         }
1330
1331         if (power <= 1000)
1332                 return 0;
1333
1334         err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1335         if (err != sizeof(val)) {
1336                 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1337                 err = -EAGAIN;
1338                 goto err;
1339         }
1340
1341         val |= BIT(0);
1342
1343         err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1344         if (err != sizeof(val)) {
1345                 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1346                 err = -EAGAIN;
1347                 goto err;
1348         }
1349
1350         dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1351                  power / 1000, (power / 100) % 10);
1352         return T_HPOWER_LEVEL;
1353
1354 err:
1355         return err;
1356 }
1357
1358 static int sfp_sm_mod_probe(struct sfp *sfp)
1359 {
1360         /* SFP module inserted - read I2C data */
1361         struct sfp_eeprom_id id;
1362         bool cotsworks;
1363         u8 check;
1364         int ret;
1365
1366         ret = sfp_read(sfp, false, 0, &id, sizeof(id));
1367         if (ret < 0) {
1368                 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1369                 return -EAGAIN;
1370         }
1371
1372         if (ret != sizeof(id)) {
1373                 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1374                 return -EAGAIN;
1375         }
1376
1377         /* Cotsworks do not seem to update the checksums when they
1378          * do the final programming with the final module part number,
1379          * serial number and date code.
1380          */
1381         cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
1382
1383         /* Validate the checksum over the base structure */
1384         check = sfp_check(&id.base, sizeof(id.base) - 1);
1385         if (check != id.base.cc_base) {
1386                 if (cotsworks) {
1387                         dev_warn(sfp->dev,
1388                                  "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1389                                  check, id.base.cc_base);
1390                 } else {
1391                         dev_err(sfp->dev,
1392                                 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1393                                 check, id.base.cc_base);
1394                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1395                                        16, 1, &id, sizeof(id), true);
1396                         return -EINVAL;
1397                 }
1398         }
1399
1400         check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1401         if (check != id.ext.cc_ext) {
1402                 if (cotsworks) {
1403                         dev_warn(sfp->dev,
1404                                  "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1405                                  check, id.ext.cc_ext);
1406                 } else {
1407                         dev_err(sfp->dev,
1408                                 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1409                                 check, id.ext.cc_ext);
1410                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1411                                        16, 1, &id, sizeof(id), true);
1412                         memset(&id.ext, 0, sizeof(id.ext));
1413                 }
1414         }
1415
1416         sfp->id = id;
1417
1418         dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1419                  (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1420                  (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1421                  (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1422                  (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1423                  (int)sizeof(id.ext.datecode), id.ext.datecode);
1424
1425         /* Check whether we support this module */
1426         if (!sfp->type->module_supported(&sfp->id)) {
1427                 dev_err(sfp->dev,
1428                         "module is not supported - phys id 0x%02x 0x%02x\n",
1429                         sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1430                 return -EINVAL;
1431         }
1432
1433         /* If the module requires address swap mode, warn about it */
1434         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1435                 dev_warn(sfp->dev,
1436                          "module address swap to access page 0xA2 is not supported.\n");
1437
1438         ret = sfp_hwmon_insert(sfp);
1439         if (ret < 0)
1440                 return ret;
1441
1442         ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
1443         if (ret < 0)
1444                 return ret;
1445
1446         return sfp_sm_mod_hpower(sfp);
1447 }
1448
1449 static void sfp_sm_mod_remove(struct sfp *sfp)
1450 {
1451         sfp_module_remove(sfp->sfp_bus);
1452
1453         sfp_hwmon_remove(sfp);
1454
1455         if (sfp->mod_phy)
1456                 sfp_sm_phy_detach(sfp);
1457
1458         sfp_module_tx_disable(sfp);
1459
1460         memset(&sfp->id, 0, sizeof(sfp->id));
1461
1462         dev_info(sfp->dev, "module removed\n");
1463 }
1464
1465 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
1466 {
1467         mutex_lock(&sfp->sm_mutex);
1468
1469         dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
1470                 mod_state_to_str(sfp->sm_mod_state),
1471                 dev_state_to_str(sfp->sm_dev_state),
1472                 sm_state_to_str(sfp->sm_state),
1473                 event_to_str(event));
1474
1475         /* This state machine tracks the insert/remove state of
1476          * the module, and handles probing the on-board EEPROM.
1477          */
1478         switch (sfp->sm_mod_state) {
1479         default:
1480                 if (event == SFP_E_INSERT && sfp->attached) {
1481                         sfp_module_tx_disable(sfp);
1482                         sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
1483                 }
1484                 break;
1485
1486         case SFP_MOD_PROBE:
1487                 if (event == SFP_E_REMOVE) {
1488                         sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1489                 } else if (event == SFP_E_TIMEOUT) {
1490                         int val = sfp_sm_mod_probe(sfp);
1491
1492                         if (val == 0)
1493                                 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1494                         else if (val > 0)
1495                                 sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
1496                         else if (val != -EAGAIN)
1497                                 sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
1498                         else
1499                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY);
1500                 }
1501                 break;
1502
1503         case SFP_MOD_HPOWER:
1504                 if (event == SFP_E_TIMEOUT) {
1505                         sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1506                         break;
1507                 }
1508                 /* fallthrough */
1509         case SFP_MOD_PRESENT:
1510         case SFP_MOD_ERROR:
1511                 if (event == SFP_E_REMOVE) {
1512                         sfp_sm_mod_remove(sfp);
1513                         sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1514                 }
1515                 break;
1516         }
1517
1518         /* This state machine tracks the netdev up/down state */
1519         switch (sfp->sm_dev_state) {
1520         default:
1521                 if (event == SFP_E_DEV_UP)
1522                         sfp->sm_dev_state = SFP_DEV_UP;
1523                 break;
1524
1525         case SFP_DEV_UP:
1526                 if (event == SFP_E_DEV_DOWN) {
1527                         /* If the module has a PHY, avoid raising TX disable
1528                          * as this resets the PHY. Otherwise, raise it to
1529                          * turn the laser off.
1530                          */
1531                         if (!sfp->mod_phy)
1532                                 sfp_module_tx_disable(sfp);
1533                         sfp->sm_dev_state = SFP_DEV_DOWN;
1534                 }
1535                 break;
1536         }
1537
1538         /* Some events are global */
1539         if (sfp->sm_state != SFP_S_DOWN &&
1540             (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1541              sfp->sm_dev_state != SFP_DEV_UP)) {
1542                 if (sfp->sm_state == SFP_S_LINK_UP &&
1543                     sfp->sm_dev_state == SFP_DEV_UP)
1544                         sfp_sm_link_down(sfp);
1545                 if (sfp->mod_phy)
1546                         sfp_sm_phy_detach(sfp);
1547                 sfp_sm_next(sfp, SFP_S_DOWN, 0);
1548                 mutex_unlock(&sfp->sm_mutex);
1549                 return;
1550         }
1551
1552         /* The main state machine */
1553         switch (sfp->sm_state) {
1554         case SFP_S_DOWN:
1555                 if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
1556                     sfp->sm_dev_state == SFP_DEV_UP)
1557                         sfp_sm_mod_init(sfp);
1558                 break;
1559
1560         case SFP_S_INIT:
1561                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
1562                         sfp_sm_fault(sfp, true);
1563                 else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
1564                         sfp_sm_link_check_los(sfp);
1565                 break;
1566
1567         case SFP_S_WAIT_LOS:
1568                 if (event == SFP_E_TX_FAULT)
1569                         sfp_sm_fault(sfp, true);
1570                 else if (sfp_los_event_inactive(sfp, event))
1571                         sfp_sm_link_up(sfp);
1572                 break;
1573
1574         case SFP_S_LINK_UP:
1575                 if (event == SFP_E_TX_FAULT) {
1576                         sfp_sm_link_down(sfp);
1577                         sfp_sm_fault(sfp, true);
1578                 } else if (sfp_los_event_active(sfp, event)) {
1579                         sfp_sm_link_down(sfp);
1580                         sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1581                 }
1582                 break;
1583
1584         case SFP_S_TX_FAULT:
1585                 if (event == SFP_E_TIMEOUT) {
1586                         sfp_module_tx_fault_reset(sfp);
1587                         sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
1588                 }
1589                 break;
1590
1591         case SFP_S_REINIT:
1592                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
1593                         sfp_sm_fault(sfp, false);
1594                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
1595                         dev_info(sfp->dev, "module transmit fault recovered\n");
1596                         sfp_sm_link_check_los(sfp);
1597                 }
1598                 break;
1599
1600         case SFP_S_TX_DISABLE:
1601                 break;
1602         }
1603
1604         dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
1605                 mod_state_to_str(sfp->sm_mod_state),
1606                 dev_state_to_str(sfp->sm_dev_state),
1607                 sm_state_to_str(sfp->sm_state));
1608
1609         mutex_unlock(&sfp->sm_mutex);
1610 }
1611
1612 static void sfp_attach(struct sfp *sfp)
1613 {
1614         sfp->attached = true;
1615         if (sfp->state & SFP_F_PRESENT)
1616                 sfp_sm_event(sfp, SFP_E_INSERT);
1617 }
1618
1619 static void sfp_detach(struct sfp *sfp)
1620 {
1621         sfp->attached = false;
1622         sfp_sm_event(sfp, SFP_E_REMOVE);
1623 }
1624
1625 static void sfp_start(struct sfp *sfp)
1626 {
1627         sfp_sm_event(sfp, SFP_E_DEV_UP);
1628 }
1629
1630 static void sfp_stop(struct sfp *sfp)
1631 {
1632         sfp_sm_event(sfp, SFP_E_DEV_DOWN);
1633 }
1634
1635 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
1636 {
1637         /* locking... and check module is present */
1638
1639         if (sfp->id.ext.sff8472_compliance &&
1640             !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
1641                 modinfo->type = ETH_MODULE_SFF_8472;
1642                 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
1643         } else {
1644                 modinfo->type = ETH_MODULE_SFF_8079;
1645                 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
1646         }
1647         return 0;
1648 }
1649
1650 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
1651                              u8 *data)
1652 {
1653         unsigned int first, last, len;
1654         int ret;
1655
1656         if (ee->len == 0)
1657                 return -EINVAL;
1658
1659         first = ee->offset;
1660         last = ee->offset + ee->len;
1661         if (first < ETH_MODULE_SFF_8079_LEN) {
1662                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
1663                 len -= first;
1664
1665                 ret = sfp_read(sfp, false, first, data, len);
1666                 if (ret < 0)
1667                         return ret;
1668
1669                 first += len;
1670                 data += len;
1671         }
1672         if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
1673                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
1674                 len -= first;
1675                 first -= ETH_MODULE_SFF_8079_LEN;
1676
1677                 ret = sfp_read(sfp, true, first, data, len);
1678                 if (ret < 0)
1679                         return ret;
1680         }
1681         return 0;
1682 }
1683
1684 static const struct sfp_socket_ops sfp_module_ops = {
1685         .attach = sfp_attach,
1686         .detach = sfp_detach,
1687         .start = sfp_start,
1688         .stop = sfp_stop,
1689         .module_info = sfp_module_info,
1690         .module_eeprom = sfp_module_eeprom,
1691 };
1692
1693 static void sfp_timeout(struct work_struct *work)
1694 {
1695         struct sfp *sfp = container_of(work, struct sfp, timeout.work);
1696
1697         rtnl_lock();
1698         sfp_sm_event(sfp, SFP_E_TIMEOUT);
1699         rtnl_unlock();
1700 }
1701
1702 static void sfp_check_state(struct sfp *sfp)
1703 {
1704         unsigned int state, i, changed;
1705
1706         state = sfp_get_state(sfp);
1707         changed = state ^ sfp->state;
1708         changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
1709
1710         for (i = 0; i < GPIO_MAX; i++)
1711                 if (changed & BIT(i))
1712                         dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
1713                                 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
1714
1715         state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
1716         sfp->state = state;
1717
1718         rtnl_lock();
1719         if (changed & SFP_F_PRESENT)
1720                 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
1721                                 SFP_E_INSERT : SFP_E_REMOVE);
1722
1723         if (changed & SFP_F_TX_FAULT)
1724                 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
1725                                 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
1726
1727         if (changed & SFP_F_LOS)
1728                 sfp_sm_event(sfp, state & SFP_F_LOS ?
1729                                 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
1730         rtnl_unlock();
1731 }
1732
1733 static irqreturn_t sfp_irq(int irq, void *data)
1734 {
1735         struct sfp *sfp = data;
1736
1737         sfp_check_state(sfp);
1738
1739         return IRQ_HANDLED;
1740 }
1741
1742 static void sfp_poll(struct work_struct *work)
1743 {
1744         struct sfp *sfp = container_of(work, struct sfp, poll.work);
1745
1746         sfp_check_state(sfp);
1747         mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1748 }
1749
1750 static struct sfp *sfp_alloc(struct device *dev)
1751 {
1752         struct sfp *sfp;
1753
1754         sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
1755         if (!sfp)
1756                 return ERR_PTR(-ENOMEM);
1757
1758         sfp->dev = dev;
1759
1760         mutex_init(&sfp->sm_mutex);
1761         INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
1762         INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
1763
1764         return sfp;
1765 }
1766
1767 static void sfp_cleanup(void *data)
1768 {
1769         struct sfp *sfp = data;
1770
1771         cancel_delayed_work_sync(&sfp->poll);
1772         cancel_delayed_work_sync(&sfp->timeout);
1773         if (sfp->i2c_mii) {
1774                 mdiobus_unregister(sfp->i2c_mii);
1775                 mdiobus_free(sfp->i2c_mii);
1776         }
1777         if (sfp->i2c)
1778                 i2c_put_adapter(sfp->i2c);
1779         kfree(sfp);
1780 }
1781
1782 static int sfp_probe(struct platform_device *pdev)
1783 {
1784         const struct sff_data *sff;
1785         struct sfp *sfp;
1786         bool poll = false;
1787         int irq, err, i;
1788
1789         sfp = sfp_alloc(&pdev->dev);
1790         if (IS_ERR(sfp))
1791                 return PTR_ERR(sfp);
1792
1793         platform_set_drvdata(pdev, sfp);
1794
1795         err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
1796         if (err < 0)
1797                 return err;
1798
1799         sff = sfp->type = &sfp_data;
1800
1801         if (pdev->dev.of_node) {
1802                 struct device_node *node = pdev->dev.of_node;
1803                 const struct of_device_id *id;
1804                 struct i2c_adapter *i2c;
1805                 struct device_node *np;
1806
1807                 id = of_match_node(sfp_of_match, node);
1808                 if (WARN_ON(!id))
1809                         return -EINVAL;
1810
1811                 sff = sfp->type = id->data;
1812
1813                 np = of_parse_phandle(node, "i2c-bus", 0);
1814                 if (!np) {
1815                         dev_err(sfp->dev, "missing 'i2c-bus' property\n");
1816                         return -ENODEV;
1817                 }
1818
1819                 i2c = of_find_i2c_adapter_by_node(np);
1820                 of_node_put(np);
1821                 if (!i2c)
1822                         return -EPROBE_DEFER;
1823
1824                 err = sfp_i2c_configure(sfp, i2c);
1825                 if (err < 0) {
1826                         i2c_put_adapter(i2c);
1827                         return err;
1828                 }
1829         }
1830
1831         for (i = 0; i < GPIO_MAX; i++)
1832                 if (sff->gpios & BIT(i)) {
1833                         sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
1834                                            gpio_of_names[i], gpio_flags[i]);
1835                         if (IS_ERR(sfp->gpio[i]))
1836                                 return PTR_ERR(sfp->gpio[i]);
1837                 }
1838
1839         sfp->get_state = sfp_gpio_get_state;
1840         sfp->set_state = sfp_gpio_set_state;
1841
1842         /* Modules that have no detect signal are always present */
1843         if (!(sfp->gpio[GPIO_MODDEF0]))
1844                 sfp->get_state = sff_gpio_get_state;
1845
1846         device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
1847                                  &sfp->max_power_mW);
1848         if (!sfp->max_power_mW)
1849                 sfp->max_power_mW = 1000;
1850
1851         dev_info(sfp->dev, "Host maximum power %u.%uW\n",
1852                  sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
1853
1854         /* Get the initial state, and always signal TX disable,
1855          * since the network interface will not be up.
1856          */
1857         sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
1858
1859         if (sfp->gpio[GPIO_RATE_SELECT] &&
1860             gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
1861                 sfp->state |= SFP_F_RATE_SELECT;
1862         sfp_set_state(sfp, sfp->state);
1863         sfp_module_tx_disable(sfp);
1864
1865         for (i = 0; i < GPIO_MAX; i++) {
1866                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
1867                         continue;
1868
1869                 irq = gpiod_to_irq(sfp->gpio[i]);
1870                 if (!irq) {
1871                         poll = true;
1872                         continue;
1873                 }
1874
1875                 err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq,
1876                                                 IRQF_ONESHOT |
1877                                                 IRQF_TRIGGER_RISING |
1878                                                 IRQF_TRIGGER_FALLING,
1879                                                 dev_name(sfp->dev), sfp);
1880                 if (err)
1881                         poll = true;
1882         }
1883
1884         if (poll)
1885                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1886
1887         /* We could have an issue in cases no Tx disable pin is available or
1888          * wired as modules using a laser as their light source will continue to
1889          * be active when the fiber is removed. This could be a safety issue and
1890          * we should at least warn the user about that.
1891          */
1892         if (!sfp->gpio[GPIO_TX_DISABLE])
1893                 dev_warn(sfp->dev,
1894                          "No tx_disable pin: SFP modules will always be emitting.\n");
1895
1896         sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
1897         if (!sfp->sfp_bus)
1898                 return -ENOMEM;
1899
1900         return 0;
1901 }
1902
1903 static int sfp_remove(struct platform_device *pdev)
1904 {
1905         struct sfp *sfp = platform_get_drvdata(pdev);
1906
1907         sfp_unregister_socket(sfp->sfp_bus);
1908
1909         return 0;
1910 }
1911
1912 static struct platform_driver sfp_driver = {
1913         .probe = sfp_probe,
1914         .remove = sfp_remove,
1915         .driver = {
1916                 .name = "sfp",
1917                 .of_match_table = sfp_of_match,
1918         },
1919 };
1920
1921 static int sfp_init(void)
1922 {
1923         poll_jiffies = msecs_to_jiffies(100);
1924
1925         return platform_driver_register(&sfp_driver);
1926 }
1927 module_init(sfp_init);
1928
1929 static void sfp_exit(void)
1930 {
1931         platform_driver_unregister(&sfp_driver);
1932 }
1933 module_exit(sfp_exit);
1934
1935 MODULE_ALIAS("platform:sfp");
1936 MODULE_AUTHOR("Russell King");
1937 MODULE_LICENSE("GPL v2");