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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/acpi.h>
3#include <linux/ctype.h>
4#include <linux/delay.h>
5#include <linux/gpio/consumer.h>
6#include <linux/hwmon.h>
7#include <linux/i2c.h>
8#include <linux/interrupt.h>
9#include <linux/jiffies.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/of.h>
13#include <linux/phy.h>
14#include <linux/platform_device.h>
15#include <linux/rtnetlink.h>
16#include <linux/slab.h>
17#include <linux/workqueue.h>
18
19#include "mdio-i2c.h"
20#include "sfp.h"
21#include "swphy.h"
22
23enum {
24 GPIO_MODDEF0,
25 GPIO_LOS,
26 GPIO_TX_FAULT,
27 GPIO_TX_DISABLE,
28 GPIO_RATE_SELECT,
29 GPIO_MAX,
30
31 SFP_F_PRESENT = BIT(GPIO_MODDEF0),
32 SFP_F_LOS = BIT(GPIO_LOS),
33 SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
34 SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
35 SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
36
37 SFP_E_INSERT = 0,
38 SFP_E_REMOVE,
39 SFP_E_DEV_DOWN,
40 SFP_E_DEV_UP,
41 SFP_E_TX_FAULT,
42 SFP_E_TX_CLEAR,
43 SFP_E_LOS_HIGH,
44 SFP_E_LOS_LOW,
45 SFP_E_TIMEOUT,
46
47 SFP_MOD_EMPTY = 0,
48 SFP_MOD_PROBE,
49 SFP_MOD_HPOWER,
50 SFP_MOD_PRESENT,
51 SFP_MOD_ERROR,
52
53 SFP_DEV_DOWN = 0,
54 SFP_DEV_UP,
55
56 SFP_S_DOWN = 0,
57 SFP_S_INIT,
58 SFP_S_WAIT_LOS,
59 SFP_S_LINK_UP,
60 SFP_S_TX_FAULT,
61 SFP_S_REINIT,
62 SFP_S_TX_DISABLE,
63};
64
65static const char * const mod_state_strings[] = {
66 [SFP_MOD_EMPTY] = "empty",
67 [SFP_MOD_PROBE] = "probe",
68 [SFP_MOD_HPOWER] = "hpower",
69 [SFP_MOD_PRESENT] = "present",
70 [SFP_MOD_ERROR] = "error",
71};
72
73static const char *mod_state_to_str(unsigned short mod_state)
74{
75 if (mod_state >= ARRAY_SIZE(mod_state_strings))
76 return "Unknown module state";
77 return mod_state_strings[mod_state];
78}
79
80static const char * const dev_state_strings[] = {
81 [SFP_DEV_DOWN] = "down",
82 [SFP_DEV_UP] = "up",
83};
84
85static const char *dev_state_to_str(unsigned short dev_state)
86{
87 if (dev_state >= ARRAY_SIZE(dev_state_strings))
88 return "Unknown device state";
89 return dev_state_strings[dev_state];
90}
91
92static const char * const event_strings[] = {
93 [SFP_E_INSERT] = "insert",
94 [SFP_E_REMOVE] = "remove",
95 [SFP_E_DEV_DOWN] = "dev_down",
96 [SFP_E_DEV_UP] = "dev_up",
97 [SFP_E_TX_FAULT] = "tx_fault",
98 [SFP_E_TX_CLEAR] = "tx_clear",
99 [SFP_E_LOS_HIGH] = "los_high",
100 [SFP_E_LOS_LOW] = "los_low",
101 [SFP_E_TIMEOUT] = "timeout",
102};
103
104static const char *event_to_str(unsigned short event)
105{
106 if (event >= ARRAY_SIZE(event_strings))
107 return "Unknown event";
108 return event_strings[event];
109}
110
111static const char * const sm_state_strings[] = {
112 [SFP_S_DOWN] = "down",
113 [SFP_S_INIT] = "init",
114 [SFP_S_WAIT_LOS] = "wait_los",
115 [SFP_S_LINK_UP] = "link_up",
116 [SFP_S_TX_FAULT] = "tx_fault",
117 [SFP_S_REINIT] = "reinit",
118 [SFP_S_TX_DISABLE] = "rx_disable",
119};
120
121static const char *sm_state_to_str(unsigned short sm_state)
122{
123 if (sm_state >= ARRAY_SIZE(sm_state_strings))
124 return "Unknown state";
125 return sm_state_strings[sm_state];
126}
127
128static const char *gpio_of_names[] = {
129 "mod-def0",
130 "los",
131 "tx-fault",
132 "tx-disable",
133 "rate-select0",
134};
135
136static const enum gpiod_flags gpio_flags[] = {
137 GPIOD_IN,
138 GPIOD_IN,
139 GPIOD_IN,
140 GPIOD_ASIS,
141 GPIOD_ASIS,
142};
143
144#define T_INIT_JIFFIES msecs_to_jiffies(300)
145#define T_RESET_US 10
146#define T_FAULT_RECOVER msecs_to_jiffies(1000)
147
148/* SFP module presence detection is poor: the three MOD DEF signals are
149 * the same length on the PCB, which means it's possible for MOD DEF 0 to
150 * connect before the I2C bus on MOD DEF 1/2.
151 *
152 * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
153 * be deasserted) but makes no mention of the earliest time before we can
154 * access the I2C EEPROM. However, Avago modules require 300ms.
155 */
156#define T_PROBE_INIT msecs_to_jiffies(300)
157#define T_HPOWER_LEVEL msecs_to_jiffies(300)
158#define T_PROBE_RETRY msecs_to_jiffies(100)
159
160/* SFP modules appear to always have their PHY configured for bus address
161 * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
162 */
163#define SFP_PHY_ADDR 22
164
165/* Give this long for the PHY to reset. */
166#define T_PHY_RESET_MS 50
167
168struct sff_data {
169 unsigned int gpios;
170 bool (*module_supported)(const struct sfp_eeprom_id *id);
171};
172
173struct sfp {
174 struct device *dev;
175 struct i2c_adapter *i2c;
176 struct mii_bus *i2c_mii;
177 struct sfp_bus *sfp_bus;
178 struct phy_device *mod_phy;
179 const struct sff_data *type;
180 u32 max_power_mW;
181
182 unsigned int (*get_state)(struct sfp *);
183 void (*set_state)(struct sfp *, unsigned int);
184 int (*read)(struct sfp *, bool, u8, void *, size_t);
185 int (*write)(struct sfp *, bool, u8, void *, size_t);
186
187 struct gpio_desc *gpio[GPIO_MAX];
188 int gpio_irq[GPIO_MAX];
189
190 bool attached;
191 struct mutex st_mutex; /* Protects state */
192 unsigned int state;
193 struct delayed_work poll;
194 struct delayed_work timeout;
195 struct mutex sm_mutex; /* Protects state machine */
196 unsigned char sm_mod_state;
197 unsigned char sm_dev_state;
198 unsigned short sm_state;
199 unsigned int sm_retries;
200
201 struct sfp_eeprom_id id;
202#if IS_ENABLED(CONFIG_HWMON)
203 struct sfp_diag diag;
204 struct device *hwmon_dev;
205 char *hwmon_name;
206#endif
207
208};
209
210static bool sff_module_supported(const struct sfp_eeprom_id *id)
211{
212 return id->base.phys_id == SFP_PHYS_ID_SFF &&
213 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
214}
215
216static const struct sff_data sff_data = {
217 .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
218 .module_supported = sff_module_supported,
219};
220
221static bool sfp_module_supported(const struct sfp_eeprom_id *id)
222{
223 return id->base.phys_id == SFP_PHYS_ID_SFP &&
224 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
225}
226
227static const struct sff_data sfp_data = {
228 .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
229 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
230 .module_supported = sfp_module_supported,
231};
232
233static const struct of_device_id sfp_of_match[] = {
234 { .compatible = "sff,sff", .data = &sff_data, },
235 { .compatible = "sff,sfp", .data = &sfp_data, },
236 { },
237};
238MODULE_DEVICE_TABLE(of, sfp_of_match);
239
240static unsigned long poll_jiffies;
241
242static unsigned int sfp_gpio_get_state(struct sfp *sfp)
243{
244 unsigned int i, state, v;
245
246 for (i = state = 0; i < GPIO_MAX; i++) {
247 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
248 continue;
249
250 v = gpiod_get_value_cansleep(sfp->gpio[i]);
251 if (v)
252 state |= BIT(i);
253 }
254
255 return state;
256}
257
258static unsigned int sff_gpio_get_state(struct sfp *sfp)
259{
260 return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
261}
262
263static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
264{
265 if (state & SFP_F_PRESENT) {
266 /* If the module is present, drive the signals */
267 if (sfp->gpio[GPIO_TX_DISABLE])
268 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
269 state & SFP_F_TX_DISABLE);
270 if (state & SFP_F_RATE_SELECT)
271 gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
272 state & SFP_F_RATE_SELECT);
273 } else {
274 /* Otherwise, let them float to the pull-ups */
275 if (sfp->gpio[GPIO_TX_DISABLE])
276 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
277 if (state & SFP_F_RATE_SELECT)
278 gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
279 }
280}
281
282static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
283 size_t len)
284{
285 struct i2c_msg msgs[2];
286 u8 bus_addr = a2 ? 0x51 : 0x50;
287 size_t this_len;
288 int ret;
289
290 msgs[0].addr = bus_addr;
291 msgs[0].flags = 0;
292 msgs[0].len = 1;
293 msgs[0].buf = &dev_addr;
294 msgs[1].addr = bus_addr;
295 msgs[1].flags = I2C_M_RD;
296 msgs[1].len = len;
297 msgs[1].buf = buf;
298
299 while (len) {
300 this_len = len;
301 if (this_len > 16)
302 this_len = 16;
303
304 msgs[1].len = this_len;
305
306 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
307 if (ret < 0)
308 return ret;
309
310 if (ret != ARRAY_SIZE(msgs))
311 break;
312
313 msgs[1].buf += this_len;
314 dev_addr += this_len;
315 len -= this_len;
316 }
317
318 return msgs[1].buf - (u8 *)buf;
319}
320
321static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
322 size_t len)
323{
324 struct i2c_msg msgs[1];
325 u8 bus_addr = a2 ? 0x51 : 0x50;
326 int ret;
327
328 msgs[0].addr = bus_addr;
329 msgs[0].flags = 0;
330 msgs[0].len = 1 + len;
331 msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
332 if (!msgs[0].buf)
333 return -ENOMEM;
334
335 msgs[0].buf[0] = dev_addr;
336 memcpy(&msgs[0].buf[1], buf, len);
337
338 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
339
340 kfree(msgs[0].buf);
341
342 if (ret < 0)
343 return ret;
344
345 return ret == ARRAY_SIZE(msgs) ? len : 0;
346}
347
348static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
349{
350 struct mii_bus *i2c_mii;
351 int ret;
352
353 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
354 return -EINVAL;
355
356 sfp->i2c = i2c;
357 sfp->read = sfp_i2c_read;
358 sfp->write = sfp_i2c_write;
359
360 i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
361 if (IS_ERR(i2c_mii))
362 return PTR_ERR(i2c_mii);
363
364 i2c_mii->name = "SFP I2C Bus";
365 i2c_mii->phy_mask = ~0;
366
367 ret = mdiobus_register(i2c_mii);
368 if (ret < 0) {
369 mdiobus_free(i2c_mii);
370 return ret;
371 }
372
373 sfp->i2c_mii = i2c_mii;
374
375 return 0;
376}
377
378/* Interface */
379static unsigned int sfp_get_state(struct sfp *sfp)
380{
381 return sfp->get_state(sfp);
382}
383
384static void sfp_set_state(struct sfp *sfp, unsigned int state)
385{
386 sfp->set_state(sfp, state);
387}
388
389static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
390{
391 return sfp->read(sfp, a2, addr, buf, len);
392}
393
394static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
395{
396 return sfp->write(sfp, a2, addr, buf, len);
397}
398
399static unsigned int sfp_check(void *buf, size_t len)
400{
401 u8 *p, check;
402
403 for (p = buf, check = 0; len; p++, len--)
404 check += *p;
405
406 return check;
407}
408
409/* hwmon */
410#if IS_ENABLED(CONFIG_HWMON)
411static umode_t sfp_hwmon_is_visible(const void *data,
412 enum hwmon_sensor_types type,
413 u32 attr, int channel)
414{
415 const struct sfp *sfp = data;
416
417 switch (type) {
418 case hwmon_temp:
419 switch (attr) {
420 case hwmon_temp_min_alarm:
421 case hwmon_temp_max_alarm:
422 case hwmon_temp_lcrit_alarm:
423 case hwmon_temp_crit_alarm:
424 case hwmon_temp_min:
425 case hwmon_temp_max:
426 case hwmon_temp_lcrit:
427 case hwmon_temp_crit:
428 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
429 return 0;
430 /* fall through */
431 case hwmon_temp_input:
432 case hwmon_temp_label:
433 return 0444;
434 default:
435 return 0;
436 }
437 case hwmon_in:
438 switch (attr) {
439 case hwmon_in_min_alarm:
440 case hwmon_in_max_alarm:
441 case hwmon_in_lcrit_alarm:
442 case hwmon_in_crit_alarm:
443 case hwmon_in_min:
444 case hwmon_in_max:
445 case hwmon_in_lcrit:
446 case hwmon_in_crit:
447 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
448 return 0;
449 /* fall through */
450 case hwmon_in_input:
451 case hwmon_in_label:
452 return 0444;
453 default:
454 return 0;
455 }
456 case hwmon_curr:
457 switch (attr) {
458 case hwmon_curr_min_alarm:
459 case hwmon_curr_max_alarm:
460 case hwmon_curr_lcrit_alarm:
461 case hwmon_curr_crit_alarm:
462 case hwmon_curr_min:
463 case hwmon_curr_max:
464 case hwmon_curr_lcrit:
465 case hwmon_curr_crit:
466 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
467 return 0;
468 /* fall through */
469 case hwmon_curr_input:
470 case hwmon_curr_label:
471 return 0444;
472 default:
473 return 0;
474 }
475 case hwmon_power:
476 /* External calibration of receive power requires
477 * floating point arithmetic. Doing that in the kernel
478 * is not easy, so just skip it. If the module does
479 * not require external calibration, we can however
480 * show receiver power, since FP is then not needed.
481 */
482 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
483 channel == 1)
484 return 0;
485 switch (attr) {
486 case hwmon_power_min_alarm:
487 case hwmon_power_max_alarm:
488 case hwmon_power_lcrit_alarm:
489 case hwmon_power_crit_alarm:
490 case hwmon_power_min:
491 case hwmon_power_max:
492 case hwmon_power_lcrit:
493 case hwmon_power_crit:
494 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
495 return 0;
496 /* fall through */
497 case hwmon_power_input:
498 case hwmon_power_label:
499 return 0444;
500 default:
501 return 0;
502 }
503 default:
504 return 0;
505 }
506}
507
508static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
509{
510 __be16 val;
511 int err;
512
513 err = sfp_read(sfp, true, reg, &val, sizeof(val));
514 if (err < 0)
515 return err;
516
517 *value = be16_to_cpu(val);
518
519 return 0;
520}
521
522static void sfp_hwmon_to_rx_power(long *value)
523{
524 *value = DIV_ROUND_CLOSEST(*value, 10);
525}
526
527static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
528 long *value)
529{
530 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
531 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
532}
533
534static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
535{
536 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
537 be16_to_cpu(sfp->diag.cal_t_offset), value);
538
539 if (*value >= 0x8000)
540 *value -= 0x10000;
541
542 *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
543}
544
545static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
546{
547 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
548 be16_to_cpu(sfp->diag.cal_v_offset), value);
549
550 *value = DIV_ROUND_CLOSEST(*value, 10);
551}
552
553static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
554{
555 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
556 be16_to_cpu(sfp->diag.cal_txi_offset), value);
557
558 *value = DIV_ROUND_CLOSEST(*value, 500);
559}
560
561static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
562{
563 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
564 be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
565
566 *value = DIV_ROUND_CLOSEST(*value, 10);
567}
568
569static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
570{
571 int err;
572
573 err = sfp_hwmon_read_sensor(sfp, reg, value);
574 if (err < 0)
575 return err;
576
577 sfp_hwmon_calibrate_temp(sfp, value);
578
579 return 0;
580}
581
582static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
583{
584 int err;
585
586 err = sfp_hwmon_read_sensor(sfp, reg, value);
587 if (err < 0)
588 return err;
589
590 sfp_hwmon_calibrate_vcc(sfp, value);
591
592 return 0;
593}
594
595static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
596{
597 int err;
598
599 err = sfp_hwmon_read_sensor(sfp, reg, value);
600 if (err < 0)
601 return err;
602
603 sfp_hwmon_calibrate_bias(sfp, value);
604
605 return 0;
606}
607
608static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
609{
610 int err;
611
612 err = sfp_hwmon_read_sensor(sfp, reg, value);
613 if (err < 0)
614 return err;
615
616 sfp_hwmon_calibrate_tx_power(sfp, value);
617
618 return 0;
619}
620
621static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
622{
623 int err;
624
625 err = sfp_hwmon_read_sensor(sfp, reg, value);
626 if (err < 0)
627 return err;
628
629 sfp_hwmon_to_rx_power(value);
630
631 return 0;
632}
633
634static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
635{
636 u8 status;
637 int err;
638
639 switch (attr) {
640 case hwmon_temp_input:
641 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
642
643 case hwmon_temp_lcrit:
644 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
645 sfp_hwmon_calibrate_temp(sfp, value);
646 return 0;
647
648 case hwmon_temp_min:
649 *value = be16_to_cpu(sfp->diag.temp_low_warn);
650 sfp_hwmon_calibrate_temp(sfp, value);
651 return 0;
652 case hwmon_temp_max:
653 *value = be16_to_cpu(sfp->diag.temp_high_warn);
654 sfp_hwmon_calibrate_temp(sfp, value);
655 return 0;
656
657 case hwmon_temp_crit:
658 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
659 sfp_hwmon_calibrate_temp(sfp, value);
660 return 0;
661
662 case hwmon_temp_lcrit_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_LOW);
668 return 0;
669
670 case hwmon_temp_min_alarm:
671 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
672 if (err < 0)
673 return err;
674
675 *value = !!(status & SFP_WARN0_TEMP_LOW);
676 return 0;
677
678 case hwmon_temp_max_alarm:
679 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
680 if (err < 0)
681 return err;
682
683 *value = !!(status & SFP_WARN0_TEMP_HIGH);
684 return 0;
685
686 case hwmon_temp_crit_alarm:
687 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
688 if (err < 0)
689 return err;
690
691 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
692 return 0;
693 default:
694 return -EOPNOTSUPP;
695 }
696
697 return -EOPNOTSUPP;
698}
699
700static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
701{
702 u8 status;
703 int err;
704
705 switch (attr) {
706 case hwmon_in_input:
707 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
708
709 case hwmon_in_lcrit:
710 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
711 sfp_hwmon_calibrate_vcc(sfp, value);
712 return 0;
713
714 case hwmon_in_min:
715 *value = be16_to_cpu(sfp->diag.volt_low_warn);
716 sfp_hwmon_calibrate_vcc(sfp, value);
717 return 0;
718
719 case hwmon_in_max:
720 *value = be16_to_cpu(sfp->diag.volt_high_warn);
721 sfp_hwmon_calibrate_vcc(sfp, value);
722 return 0;
723
724 case hwmon_in_crit:
725 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
726 sfp_hwmon_calibrate_vcc(sfp, value);
727 return 0;
728
729 case hwmon_in_lcrit_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_LOW);
735 return 0;
736
737 case hwmon_in_min_alarm:
738 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
739 if (err < 0)
740 return err;
741
742 *value = !!(status & SFP_WARN0_VCC_LOW);
743 return 0;
744
745 case hwmon_in_max_alarm:
746 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
747 if (err < 0)
748 return err;
749
750 *value = !!(status & SFP_WARN0_VCC_HIGH);
751 return 0;
752
753 case hwmon_in_crit_alarm:
754 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
755 if (err < 0)
756 return err;
757
758 *value = !!(status & SFP_ALARM0_VCC_HIGH);
759 return 0;
760 default:
761 return -EOPNOTSUPP;
762 }
763
764 return -EOPNOTSUPP;
765}
766
767static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
768{
769 u8 status;
770 int err;
771
772 switch (attr) {
773 case hwmon_curr_input:
774 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
775
776 case hwmon_curr_lcrit:
777 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
778 sfp_hwmon_calibrate_bias(sfp, value);
779 return 0;
780
781 case hwmon_curr_min:
782 *value = be16_to_cpu(sfp->diag.bias_low_warn);
783 sfp_hwmon_calibrate_bias(sfp, value);
784 return 0;
785
786 case hwmon_curr_max:
787 *value = be16_to_cpu(sfp->diag.bias_high_warn);
788 sfp_hwmon_calibrate_bias(sfp, value);
789 return 0;
790
791 case hwmon_curr_crit:
792 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
793 sfp_hwmon_calibrate_bias(sfp, value);
794 return 0;
795
796 case hwmon_curr_lcrit_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_LOW);
802 return 0;
803
804 case hwmon_curr_min_alarm:
805 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
806 if (err < 0)
807 return err;
808
809 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
810 return 0;
811
812 case hwmon_curr_max_alarm:
813 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
814 if (err < 0)
815 return err;
816
817 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
818 return 0;
819
820 case hwmon_curr_crit_alarm:
821 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
822 if (err < 0)
823 return err;
824
825 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
826 return 0;
827 default:
828 return -EOPNOTSUPP;
829 }
830
831 return -EOPNOTSUPP;
832}
833
834static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
835{
836 u8 status;
837 int err;
838
839 switch (attr) {
840 case hwmon_power_input:
841 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
842
843 case hwmon_power_lcrit:
844 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
845 sfp_hwmon_calibrate_tx_power(sfp, value);
846 return 0;
847
848 case hwmon_power_min:
849 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
850 sfp_hwmon_calibrate_tx_power(sfp, value);
851 return 0;
852
853 case hwmon_power_max:
854 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
855 sfp_hwmon_calibrate_tx_power(sfp, value);
856 return 0;
857
858 case hwmon_power_crit:
859 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
860 sfp_hwmon_calibrate_tx_power(sfp, value);
861 return 0;
862
863 case hwmon_power_lcrit_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_LOW);
869 return 0;
870
871 case hwmon_power_min_alarm:
872 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
873 if (err < 0)
874 return err;
875
876 *value = !!(status & SFP_WARN0_TXPWR_LOW);
877 return 0;
878
879 case hwmon_power_max_alarm:
880 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
881 if (err < 0)
882 return err;
883
884 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
885 return 0;
886
887 case hwmon_power_crit_alarm:
888 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
889 if (err < 0)
890 return err;
891
892 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
893 return 0;
894 default:
895 return -EOPNOTSUPP;
896 }
897
898 return -EOPNOTSUPP;
899}
900
901static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
902{
903 u8 status;
904 int err;
905
906 switch (attr) {
907 case hwmon_power_input:
908 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
909
910 case hwmon_power_lcrit:
911 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
912 sfp_hwmon_to_rx_power(value);
913 return 0;
914
915 case hwmon_power_min:
916 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
917 sfp_hwmon_to_rx_power(value);
918 return 0;
919
920 case hwmon_power_max:
921 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
922 sfp_hwmon_to_rx_power(value);
923 return 0;
924
925 case hwmon_power_crit:
926 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
927 sfp_hwmon_to_rx_power(value);
928 return 0;
929
930 case hwmon_power_lcrit_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_LOW);
936 return 0;
937
938 case hwmon_power_min_alarm:
939 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
940 if (err < 0)
941 return err;
942
943 *value = !!(status & SFP_WARN1_RXPWR_LOW);
944 return 0;
945
946 case hwmon_power_max_alarm:
947 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
948 if (err < 0)
949 return err;
950
951 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
952 return 0;
953
954 case hwmon_power_crit_alarm:
955 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
956 if (err < 0)
957 return err;
958
959 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
960 return 0;
961 default:
962 return -EOPNOTSUPP;
963 }
964
965 return -EOPNOTSUPP;
966}
967
968static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
969 u32 attr, int channel, long *value)
970{
971 struct sfp *sfp = dev_get_drvdata(dev);
972
973 switch (type) {
974 case hwmon_temp:
975 return sfp_hwmon_temp(sfp, attr, value);
976 case hwmon_in:
977 return sfp_hwmon_vcc(sfp, attr, value);
978 case hwmon_curr:
979 return sfp_hwmon_bias(sfp, attr, value);
980 case hwmon_power:
981 switch (channel) {
982 case 0:
983 return sfp_hwmon_tx_power(sfp, attr, value);
984 case 1:
985 return sfp_hwmon_rx_power(sfp, attr, value);
986 default:
987 return -EOPNOTSUPP;
988 }
989 default:
990 return -EOPNOTSUPP;
991 }
992}
993
994static const char *const sfp_hwmon_power_labels[] = {
995 "TX_power",
996 "RX_power",
997};
998
999static int sfp_hwmon_read_string(struct device *dev,
1000 enum hwmon_sensor_types type,
1001 u32 attr, int channel, const char **str)
1002{
1003 switch (type) {
1004 case hwmon_curr:
1005 switch (attr) {
1006 case hwmon_curr_label:
1007 *str = "bias";
1008 return 0;
1009 default:
1010 return -EOPNOTSUPP;
1011 }
1012 break;
1013 case hwmon_temp:
1014 switch (attr) {
1015 case hwmon_temp_label:
1016 *str = "temperature";
1017 return 0;
1018 default:
1019 return -EOPNOTSUPP;
1020 }
1021 break;
1022 case hwmon_in:
1023 switch (attr) {
1024 case hwmon_in_label:
1025 *str = "VCC";
1026 return 0;
1027 default:
1028 return -EOPNOTSUPP;
1029 }
1030 break;
1031 case hwmon_power:
1032 switch (attr) {
1033 case hwmon_power_label:
1034 *str = sfp_hwmon_power_labels[channel];
1035 return 0;
1036 default:
1037 return -EOPNOTSUPP;
1038 }
1039 break;
1040 default:
1041 return -EOPNOTSUPP;
1042 }
1043
1044 return -EOPNOTSUPP;
1045}
1046
1047static const struct hwmon_ops sfp_hwmon_ops = {
1048 .is_visible = sfp_hwmon_is_visible,
1049 .read = sfp_hwmon_read,
1050 .read_string = sfp_hwmon_read_string,
1051};
1052
1053static u32 sfp_hwmon_chip_config[] = {
1054 HWMON_C_REGISTER_TZ,
1055 0,
1056};
1057
1058static const struct hwmon_channel_info sfp_hwmon_chip = {
1059 .type = hwmon_chip,
1060 .config = sfp_hwmon_chip_config,
1061};
1062
1063static u32 sfp_hwmon_temp_config[] = {
1064 HWMON_T_INPUT |
1065 HWMON_T_MAX | HWMON_T_MIN |
1066 HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
1067 HWMON_T_CRIT | HWMON_T_LCRIT |
1068 HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM |
1069 HWMON_T_LABEL,
1070 0,
1071};
1072
1073static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
1074 .type = hwmon_temp,
1075 .config = sfp_hwmon_temp_config,
1076};
1077
1078static u32 sfp_hwmon_vcc_config[] = {
1079 HWMON_I_INPUT |
1080 HWMON_I_MAX | HWMON_I_MIN |
1081 HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1082 HWMON_I_CRIT | HWMON_I_LCRIT |
1083 HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM |
1084 HWMON_I_LABEL,
1085 0,
1086};
1087
1088static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1089 .type = hwmon_in,
1090 .config = sfp_hwmon_vcc_config,
1091};
1092
1093static u32 sfp_hwmon_bias_config[] = {
1094 HWMON_C_INPUT |
1095 HWMON_C_MAX | HWMON_C_MIN |
1096 HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1097 HWMON_C_CRIT | HWMON_C_LCRIT |
1098 HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM |
1099 HWMON_C_LABEL,
1100 0,
1101};
1102
1103static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1104 .type = hwmon_curr,
1105 .config = sfp_hwmon_bias_config,
1106};
1107
1108static u32 sfp_hwmon_power_config[] = {
1109 /* Transmit power */
1110 HWMON_P_INPUT |
1111 HWMON_P_MAX | HWMON_P_MIN |
1112 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1113 HWMON_P_CRIT | HWMON_P_LCRIT |
1114 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1115 HWMON_P_LABEL,
1116 /* Receive power */
1117 HWMON_P_INPUT |
1118 HWMON_P_MAX | HWMON_P_MIN |
1119 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1120 HWMON_P_CRIT | HWMON_P_LCRIT |
1121 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1122 HWMON_P_LABEL,
1123 0,
1124};
1125
1126static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1127 .type = hwmon_power,
1128 .config = sfp_hwmon_power_config,
1129};
1130
1131static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1132 &sfp_hwmon_chip,
1133 &sfp_hwmon_vcc_channel_info,
1134 &sfp_hwmon_temp_channel_info,
1135 &sfp_hwmon_bias_channel_info,
1136 &sfp_hwmon_power_channel_info,
1137 NULL,
1138};
1139
1140static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1141 .ops = &sfp_hwmon_ops,
1142 .info = sfp_hwmon_info,
1143};
1144
1145static int sfp_hwmon_insert(struct sfp *sfp)
1146{
1147 int err, i;
1148
1149 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1150 return 0;
1151
1152 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1153 return 0;
1154
1155 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1156 /* This driver in general does not support address
1157 * change.
1158 */
1159 return 0;
1160
1161 err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1162 if (err < 0)
1163 return err;
1164
1165 sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1166 if (!sfp->hwmon_name)
1167 return -ENODEV;
1168
1169 for (i = 0; sfp->hwmon_name[i]; i++)
1170 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1171 sfp->hwmon_name[i] = '_';
1172
1173 sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1174 sfp->hwmon_name, sfp,
1175 &sfp_hwmon_chip_info,
1176 NULL);
1177
1178 return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
1179}
1180
1181static void sfp_hwmon_remove(struct sfp *sfp)
1182{
1183 if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1184 hwmon_device_unregister(sfp->hwmon_dev);
1185 sfp->hwmon_dev = NULL;
1186 kfree(sfp->hwmon_name);
1187 }
1188}
1189#else
1190static int sfp_hwmon_insert(struct sfp *sfp)
1191{
1192 return 0;
1193}
1194
1195static void sfp_hwmon_remove(struct sfp *sfp)
1196{
1197}
1198#endif
1199
1200/* Helpers */
1201static void sfp_module_tx_disable(struct sfp *sfp)
1202{
1203 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1204 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1205 sfp->state |= SFP_F_TX_DISABLE;
1206 sfp_set_state(sfp, sfp->state);
1207}
1208
1209static void sfp_module_tx_enable(struct sfp *sfp)
1210{
1211 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1212 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1213 sfp->state &= ~SFP_F_TX_DISABLE;
1214 sfp_set_state(sfp, sfp->state);
1215}
1216
1217static void sfp_module_tx_fault_reset(struct sfp *sfp)
1218{
1219 unsigned int state = sfp->state;
1220
1221 if (state & SFP_F_TX_DISABLE)
1222 return;
1223
1224 sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1225
1226 udelay(T_RESET_US);
1227
1228 sfp_set_state(sfp, state);
1229}
1230
1231/* SFP state machine */
1232static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1233{
1234 if (timeout)
1235 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1236 timeout);
1237 else
1238 cancel_delayed_work(&sfp->timeout);
1239}
1240
1241static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1242 unsigned int timeout)
1243{
1244 sfp->sm_state = state;
1245 sfp_sm_set_timer(sfp, timeout);
1246}
1247
1248static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
1249 unsigned int timeout)
1250{
1251 sfp->sm_mod_state = state;
1252 sfp_sm_set_timer(sfp, timeout);
1253}
1254
1255static void sfp_sm_phy_detach(struct sfp *sfp)
1256{
1257 phy_stop(sfp->mod_phy);
1258 sfp_remove_phy(sfp->sfp_bus);
1259 phy_device_remove(sfp->mod_phy);
1260 phy_device_free(sfp->mod_phy);
1261 sfp->mod_phy = NULL;
1262}
1263
1264static void sfp_sm_probe_phy(struct sfp *sfp)
1265{
1266 struct phy_device *phy;
1267 int err;
1268
1269 msleep(T_PHY_RESET_MS);
1270
1271 phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
1272 if (phy == ERR_PTR(-ENODEV)) {
1273 dev_info(sfp->dev, "no PHY detected\n");
1274 return;
1275 }
1276 if (IS_ERR(phy)) {
1277 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1278 return;
1279 }
1280
1281 err = sfp_add_phy(sfp->sfp_bus, phy);
1282 if (err) {
1283 phy_device_remove(phy);
1284 phy_device_free(phy);
1285 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1286 return;
1287 }
1288
1289 sfp->mod_phy = phy;
1290 phy_start(phy);
1291}
1292
1293static void sfp_sm_link_up(struct sfp *sfp)
1294{
1295 sfp_link_up(sfp->sfp_bus);
1296 sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1297}
1298
1299static void sfp_sm_link_down(struct sfp *sfp)
1300{
1301 sfp_link_down(sfp->sfp_bus);
1302}
1303
1304static void sfp_sm_link_check_los(struct sfp *sfp)
1305{
1306 unsigned int los = sfp->state & SFP_F_LOS;
1307
1308 /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1309 * are set, we assume that no LOS signal is available.
1310 */
1311 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
1312 los ^= SFP_F_LOS;
1313 else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
1314 los = 0;
1315
1316 if (los)
1317 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1318 else
1319 sfp_sm_link_up(sfp);
1320}
1321
1322static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1323{
1324 return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1325 event == SFP_E_LOS_LOW) ||
1326 (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1327 event == SFP_E_LOS_HIGH);
1328}
1329
1330static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1331{
1332 return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1333 event == SFP_E_LOS_HIGH) ||
1334 (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1335 event == SFP_E_LOS_LOW);
1336}
1337
1338static void sfp_sm_fault(struct sfp *sfp, bool warn)
1339{
1340 if (sfp->sm_retries && !--sfp->sm_retries) {
1341 dev_err(sfp->dev,
1342 "module persistently indicates fault, disabling\n");
1343 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1344 } else {
1345 if (warn)
1346 dev_err(sfp->dev, "module transmit fault indicated\n");
1347
1348 sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
1349 }
1350}
1351
1352static void sfp_sm_mod_init(struct sfp *sfp)
1353{
1354 sfp_module_tx_enable(sfp);
1355
1356 /* Wait t_init before indicating that the link is up, provided the
1357 * current state indicates no TX_FAULT. If TX_FAULT clears before
1358 * this time, that's fine too.
1359 */
1360 sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
1361 sfp->sm_retries = 5;
1362
1363 /* Setting the serdes link mode is guesswork: there's no
1364 * field in the EEPROM which indicates what mode should
1365 * be used.
1366 *
1367 * If it's a gigabit-only fiber module, it probably does
1368 * not have a PHY, so switch to 802.3z negotiation mode.
1369 * Otherwise, switch to SGMII mode (which is required to
1370 * support non-gigabit speeds) and probe for a PHY.
1371 */
1372 if (sfp->id.base.e1000_base_t ||
1373 sfp->id.base.e100_base_lx ||
1374 sfp->id.base.e100_base_fx)
1375 sfp_sm_probe_phy(sfp);
1376}
1377
1378static int sfp_sm_mod_hpower(struct sfp *sfp)
1379{
1380 u32 power;
1381 u8 val;
1382 int err;
1383
1384 power = 1000;
1385 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1386 power = 1500;
1387 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1388 power = 2000;
1389
1390 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
1391 (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
1392 SFP_DIAGMON_DDM) {
1393 /* The module appears not to implement bus address 0xa2,
1394 * or requires an address change sequence, so assume that
1395 * the module powers up in the indicated power mode.
1396 */
1397 if (power > sfp->max_power_mW) {
1398 dev_err(sfp->dev,
1399 "Host does not support %u.%uW modules\n",
1400 power / 1000, (power / 100) % 10);
1401 return -EINVAL;
1402 }
1403 return 0;
1404 }
1405
1406 if (power > sfp->max_power_mW) {
1407 dev_warn(sfp->dev,
1408 "Host does not support %u.%uW modules, module left in power mode 1\n",
1409 power / 1000, (power / 100) % 10);
1410 return 0;
1411 }
1412
1413 if (power <= 1000)
1414 return 0;
1415
1416 err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1417 if (err != sizeof(val)) {
1418 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1419 err = -EAGAIN;
1420 goto err;
1421 }
1422
1423 val |= BIT(0);
1424
1425 err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1426 if (err != sizeof(val)) {
1427 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1428 err = -EAGAIN;
1429 goto err;
1430 }
1431
1432 dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1433 power / 1000, (power / 100) % 10);
1434 return T_HPOWER_LEVEL;
1435
1436err:
1437 return err;
1438}
1439
1440static int sfp_sm_mod_probe(struct sfp *sfp)
1441{
1442 /* SFP module inserted - read I2C data */
1443 struct sfp_eeprom_id id;
1444 bool cotsworks;
1445 u8 check;
1446 int ret;
1447
1448 ret = sfp_read(sfp, false, 0, &id, sizeof(id));
1449 if (ret < 0) {
1450 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1451 return -EAGAIN;
1452 }
1453
1454 if (ret != sizeof(id)) {
1455 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1456 return -EAGAIN;
1457 }
1458
1459 /* Cotsworks do not seem to update the checksums when they
1460 * do the final programming with the final module part number,
1461 * serial number and date code.
1462 */
1463 cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16);
1464
1465 /* Validate the checksum over the base structure */
1466 check = sfp_check(&id.base, sizeof(id.base) - 1);
1467 if (check != id.base.cc_base) {
1468 if (cotsworks) {
1469 dev_warn(sfp->dev,
1470 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1471 check, id.base.cc_base);
1472 } else {
1473 dev_err(sfp->dev,
1474 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1475 check, id.base.cc_base);
1476 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1477 16, 1, &id, sizeof(id), true);
1478 return -EINVAL;
1479 }
1480 }
1481
1482 check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1483 if (check != id.ext.cc_ext) {
1484 if (cotsworks) {
1485 dev_warn(sfp->dev,
1486 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1487 check, id.ext.cc_ext);
1488 } else {
1489 dev_err(sfp->dev,
1490 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1491 check, id.ext.cc_ext);
1492 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1493 16, 1, &id, sizeof(id), true);
1494 memset(&id.ext, 0, sizeof(id.ext));
1495 }
1496 }
1497
1498 sfp->id = id;
1499
1500 dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1501 (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1502 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1503 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1504 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1505 (int)sizeof(id.ext.datecode), id.ext.datecode);
1506
1507 /* Check whether we support this module */
1508 if (!sfp->type->module_supported(&sfp->id)) {
1509 dev_err(sfp->dev,
1510 "module is not supported - phys id 0x%02x 0x%02x\n",
1511 sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1512 return -EINVAL;
1513 }
1514
1515 /* If the module requires address swap mode, warn about it */
1516 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1517 dev_warn(sfp->dev,
1518 "module address swap to access page 0xA2 is not supported.\n");
1519
1520 ret = sfp_hwmon_insert(sfp);
1521 if (ret < 0)
1522 return ret;
1523
1524 ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
1525 if (ret < 0)
1526 return ret;
1527
1528 return sfp_sm_mod_hpower(sfp);
1529}
1530
1531static void sfp_sm_mod_remove(struct sfp *sfp)
1532{
1533 sfp_module_remove(sfp->sfp_bus);
1534
1535 sfp_hwmon_remove(sfp);
1536
1537 if (sfp->mod_phy)
1538 sfp_sm_phy_detach(sfp);
1539
1540 sfp_module_tx_disable(sfp);
1541
1542 memset(&sfp->id, 0, sizeof(sfp->id));
1543
1544 dev_info(sfp->dev, "module removed\n");
1545}
1546
1547static void sfp_sm_event(struct sfp *sfp, unsigned int event)
1548{
1549 mutex_lock(&sfp->sm_mutex);
1550
1551 dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
1552 mod_state_to_str(sfp->sm_mod_state),
1553 dev_state_to_str(sfp->sm_dev_state),
1554 sm_state_to_str(sfp->sm_state),
1555 event_to_str(event));
1556
1557 /* This state machine tracks the insert/remove state of
1558 * the module, and handles probing the on-board EEPROM.
1559 */
1560 switch (sfp->sm_mod_state) {
1561 default:
1562 if (event == SFP_E_INSERT && sfp->attached) {
1563 sfp_module_tx_disable(sfp);
1564 sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
1565 }
1566 break;
1567
1568 case SFP_MOD_PROBE:
1569 if (event == SFP_E_REMOVE) {
1570 sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1571 } else if (event == SFP_E_TIMEOUT) {
1572 int val = sfp_sm_mod_probe(sfp);
1573
1574 if (val == 0)
1575 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1576 else if (val > 0)
1577 sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
1578 else if (val != -EAGAIN)
1579 sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
1580 else
1581 sfp_sm_set_timer(sfp, T_PROBE_RETRY);
1582 }
1583 break;
1584
1585 case SFP_MOD_HPOWER:
1586 if (event == SFP_E_TIMEOUT) {
1587 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1588 break;
1589 }
1590 /* fallthrough */
1591 case SFP_MOD_PRESENT:
1592 case SFP_MOD_ERROR:
1593 if (event == SFP_E_REMOVE) {
1594 sfp_sm_mod_remove(sfp);
1595 sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1596 }
1597 break;
1598 }
1599
1600 /* This state machine tracks the netdev up/down state */
1601 switch (sfp->sm_dev_state) {
1602 default:
1603 if (event == SFP_E_DEV_UP)
1604 sfp->sm_dev_state = SFP_DEV_UP;
1605 break;
1606
1607 case SFP_DEV_UP:
1608 if (event == SFP_E_DEV_DOWN) {
1609 /* If the module has a PHY, avoid raising TX disable
1610 * as this resets the PHY. Otherwise, raise it to
1611 * turn the laser off.
1612 */
1613 if (!sfp->mod_phy)
1614 sfp_module_tx_disable(sfp);
1615 sfp->sm_dev_state = SFP_DEV_DOWN;
1616 }
1617 break;
1618 }
1619
1620 /* Some events are global */
1621 if (sfp->sm_state != SFP_S_DOWN &&
1622 (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1623 sfp->sm_dev_state != SFP_DEV_UP)) {
1624 if (sfp->sm_state == SFP_S_LINK_UP &&
1625 sfp->sm_dev_state == SFP_DEV_UP)
1626 sfp_sm_link_down(sfp);
1627 if (sfp->mod_phy)
1628 sfp_sm_phy_detach(sfp);
1629 sfp_sm_next(sfp, SFP_S_DOWN, 0);
1630 mutex_unlock(&sfp->sm_mutex);
1631 return;
1632 }
1633
1634 /* The main state machine */
1635 switch (sfp->sm_state) {
1636 case SFP_S_DOWN:
1637 if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
1638 sfp->sm_dev_state == SFP_DEV_UP)
1639 sfp_sm_mod_init(sfp);
1640 break;
1641
1642 case SFP_S_INIT:
1643 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
1644 sfp_sm_fault(sfp, true);
1645 else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
1646 sfp_sm_link_check_los(sfp);
1647 break;
1648
1649 case SFP_S_WAIT_LOS:
1650 if (event == SFP_E_TX_FAULT)
1651 sfp_sm_fault(sfp, true);
1652 else if (sfp_los_event_inactive(sfp, event))
1653 sfp_sm_link_up(sfp);
1654 break;
1655
1656 case SFP_S_LINK_UP:
1657 if (event == SFP_E_TX_FAULT) {
1658 sfp_sm_link_down(sfp);
1659 sfp_sm_fault(sfp, true);
1660 } else if (sfp_los_event_active(sfp, event)) {
1661 sfp_sm_link_down(sfp);
1662 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1663 }
1664 break;
1665
1666 case SFP_S_TX_FAULT:
1667 if (event == SFP_E_TIMEOUT) {
1668 sfp_module_tx_fault_reset(sfp);
1669 sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
1670 }
1671 break;
1672
1673 case SFP_S_REINIT:
1674 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
1675 sfp_sm_fault(sfp, false);
1676 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
1677 dev_info(sfp->dev, "module transmit fault recovered\n");
1678 sfp_sm_link_check_los(sfp);
1679 }
1680 break;
1681
1682 case SFP_S_TX_DISABLE:
1683 break;
1684 }
1685
1686 dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
1687 mod_state_to_str(sfp->sm_mod_state),
1688 dev_state_to_str(sfp->sm_dev_state),
1689 sm_state_to_str(sfp->sm_state));
1690
1691 mutex_unlock(&sfp->sm_mutex);
1692}
1693
1694static void sfp_attach(struct sfp *sfp)
1695{
1696 sfp->attached = true;
1697 if (sfp->state & SFP_F_PRESENT)
1698 sfp_sm_event(sfp, SFP_E_INSERT);
1699}
1700
1701static void sfp_detach(struct sfp *sfp)
1702{
1703 sfp->attached = false;
1704 sfp_sm_event(sfp, SFP_E_REMOVE);
1705}
1706
1707static void sfp_start(struct sfp *sfp)
1708{
1709 sfp_sm_event(sfp, SFP_E_DEV_UP);
1710}
1711
1712static void sfp_stop(struct sfp *sfp)
1713{
1714 sfp_sm_event(sfp, SFP_E_DEV_DOWN);
1715}
1716
1717static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
1718{
1719 /* locking... and check module is present */
1720
1721 if (sfp->id.ext.sff8472_compliance &&
1722 !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
1723 modinfo->type = ETH_MODULE_SFF_8472;
1724 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
1725 } else {
1726 modinfo->type = ETH_MODULE_SFF_8079;
1727 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
1728 }
1729 return 0;
1730}
1731
1732static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
1733 u8 *data)
1734{
1735 unsigned int first, last, len;
1736 int ret;
1737
1738 if (ee->len == 0)
1739 return -EINVAL;
1740
1741 first = ee->offset;
1742 last = ee->offset + ee->len;
1743 if (first < ETH_MODULE_SFF_8079_LEN) {
1744 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
1745 len -= first;
1746
1747 ret = sfp_read(sfp, false, first, data, len);
1748 if (ret < 0)
1749 return ret;
1750
1751 first += len;
1752 data += len;
1753 }
1754 if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
1755 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
1756 len -= first;
1757 first -= ETH_MODULE_SFF_8079_LEN;
1758
1759 ret = sfp_read(sfp, true, first, data, len);
1760 if (ret < 0)
1761 return ret;
1762 }
1763 return 0;
1764}
1765
1766static const struct sfp_socket_ops sfp_module_ops = {
1767 .attach = sfp_attach,
1768 .detach = sfp_detach,
1769 .start = sfp_start,
1770 .stop = sfp_stop,
1771 .module_info = sfp_module_info,
1772 .module_eeprom = sfp_module_eeprom,
1773};
1774
1775static void sfp_timeout(struct work_struct *work)
1776{
1777 struct sfp *sfp = container_of(work, struct sfp, timeout.work);
1778
1779 rtnl_lock();
1780 sfp_sm_event(sfp, SFP_E_TIMEOUT);
1781 rtnl_unlock();
1782}
1783
1784static void sfp_check_state(struct sfp *sfp)
1785{
1786 unsigned int state, i, changed;
1787
1788 mutex_lock(&sfp->st_mutex);
1789 state = sfp_get_state(sfp);
1790 changed = state ^ sfp->state;
1791 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
1792
1793 for (i = 0; i < GPIO_MAX; i++)
1794 if (changed & BIT(i))
1795 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
1796 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
1797
1798 state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
1799 sfp->state = state;
1800
1801 rtnl_lock();
1802 if (changed & SFP_F_PRESENT)
1803 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
1804 SFP_E_INSERT : SFP_E_REMOVE);
1805
1806 if (changed & SFP_F_TX_FAULT)
1807 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
1808 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
1809
1810 if (changed & SFP_F_LOS)
1811 sfp_sm_event(sfp, state & SFP_F_LOS ?
1812 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
1813 rtnl_unlock();
1814 mutex_unlock(&sfp->st_mutex);
1815}
1816
1817static irqreturn_t sfp_irq(int irq, void *data)
1818{
1819 struct sfp *sfp = data;
1820
1821 sfp_check_state(sfp);
1822
1823 return IRQ_HANDLED;
1824}
1825
1826static void sfp_poll(struct work_struct *work)
1827{
1828 struct sfp *sfp = container_of(work, struct sfp, poll.work);
1829
1830 sfp_check_state(sfp);
1831 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1832}
1833
1834static struct sfp *sfp_alloc(struct device *dev)
1835{
1836 struct sfp *sfp;
1837
1838 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
1839 if (!sfp)
1840 return ERR_PTR(-ENOMEM);
1841
1842 sfp->dev = dev;
1843
1844 mutex_init(&sfp->sm_mutex);
1845 mutex_init(&sfp->st_mutex);
1846 INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
1847 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
1848
1849 return sfp;
1850}
1851
1852static void sfp_cleanup(void *data)
1853{
1854 struct sfp *sfp = data;
1855
1856 cancel_delayed_work_sync(&sfp->poll);
1857 cancel_delayed_work_sync(&sfp->timeout);
1858 if (sfp->i2c_mii) {
1859 mdiobus_unregister(sfp->i2c_mii);
1860 mdiobus_free(sfp->i2c_mii);
1861 }
1862 if (sfp->i2c)
1863 i2c_put_adapter(sfp->i2c);
1864 kfree(sfp);
1865}
1866
1867static int sfp_probe(struct platform_device *pdev)
1868{
1869 const struct sff_data *sff;
1870 struct i2c_adapter *i2c;
1871 struct sfp *sfp;
1872 bool poll = false;
1873 int err, i;
1874
1875 sfp = sfp_alloc(&pdev->dev);
1876 if (IS_ERR(sfp))
1877 return PTR_ERR(sfp);
1878
1879 platform_set_drvdata(pdev, sfp);
1880
1881 err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
1882 if (err < 0)
1883 return err;
1884
1885 sff = sfp->type = &sfp_data;
1886
1887 if (pdev->dev.of_node) {
1888 struct device_node *node = pdev->dev.of_node;
1889 const struct of_device_id *id;
1890 struct device_node *np;
1891
1892 id = of_match_node(sfp_of_match, node);
1893 if (WARN_ON(!id))
1894 return -EINVAL;
1895
1896 sff = sfp->type = id->data;
1897
1898 np = of_parse_phandle(node, "i2c-bus", 0);
1899 if (!np) {
1900 dev_err(sfp->dev, "missing 'i2c-bus' property\n");
1901 return -ENODEV;
1902 }
1903
1904 i2c = of_find_i2c_adapter_by_node(np);
1905 of_node_put(np);
1906 } else if (has_acpi_companion(&pdev->dev)) {
1907 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
1908 struct fwnode_handle *fw = acpi_fwnode_handle(adev);
1909 struct fwnode_reference_args args;
1910 struct acpi_handle *acpi_handle;
1911 int ret;
1912
1913 ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args);
1914 if (ret || !is_acpi_device_node(args.fwnode)) {
1915 dev_err(&pdev->dev, "missing 'i2c-bus' property\n");
1916 return -ENODEV;
1917 }
1918
1919 acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode);
1920 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
1921 } else {
1922 return -EINVAL;
1923 }
1924
1925 if (!i2c)
1926 return -EPROBE_DEFER;
1927
1928 err = sfp_i2c_configure(sfp, i2c);
1929 if (err < 0) {
1930 i2c_put_adapter(i2c);
1931 return err;
1932 }
1933
1934 for (i = 0; i < GPIO_MAX; i++)
1935 if (sff->gpios & BIT(i)) {
1936 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
1937 gpio_of_names[i], gpio_flags[i]);
1938 if (IS_ERR(sfp->gpio[i]))
1939 return PTR_ERR(sfp->gpio[i]);
1940 }
1941
1942 sfp->get_state = sfp_gpio_get_state;
1943 sfp->set_state = sfp_gpio_set_state;
1944
1945 /* Modules that have no detect signal are always present */
1946 if (!(sfp->gpio[GPIO_MODDEF0]))
1947 sfp->get_state = sff_gpio_get_state;
1948
1949 device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
1950 &sfp->max_power_mW);
1951 if (!sfp->max_power_mW)
1952 sfp->max_power_mW = 1000;
1953
1954 dev_info(sfp->dev, "Host maximum power %u.%uW\n",
1955 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
1956
1957 /* Get the initial state, and always signal TX disable,
1958 * since the network interface will not be up.
1959 */
1960 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
1961
1962 if (sfp->gpio[GPIO_RATE_SELECT] &&
1963 gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
1964 sfp->state |= SFP_F_RATE_SELECT;
1965 sfp_set_state(sfp, sfp->state);
1966 sfp_module_tx_disable(sfp);
1967
1968 for (i = 0; i < GPIO_MAX; i++) {
1969 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
1970 continue;
1971
1972 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
1973 if (!sfp->gpio_irq[i]) {
1974 poll = true;
1975 continue;
1976 }
1977
1978 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
1979 NULL, sfp_irq,
1980 IRQF_ONESHOT |
1981 IRQF_TRIGGER_RISING |
1982 IRQF_TRIGGER_FALLING,
1983 dev_name(sfp->dev), sfp);
1984 if (err) {
1985 sfp->gpio_irq[i] = 0;
1986 poll = true;
1987 }
1988 }
1989
1990 if (poll)
1991 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1992
1993 /* We could have an issue in cases no Tx disable pin is available or
1994 * wired as modules using a laser as their light source will continue to
1995 * be active when the fiber is removed. This could be a safety issue and
1996 * we should at least warn the user about that.
1997 */
1998 if (!sfp->gpio[GPIO_TX_DISABLE])
1999 dev_warn(sfp->dev,
2000 "No tx_disable pin: SFP modules will always be emitting.\n");
2001
2002 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
2003 if (!sfp->sfp_bus)
2004 return -ENOMEM;
2005
2006 return 0;
2007}
2008
2009static int sfp_remove(struct platform_device *pdev)
2010{
2011 struct sfp *sfp = platform_get_drvdata(pdev);
2012
2013 sfp_unregister_socket(sfp->sfp_bus);
2014
2015 return 0;
2016}
2017
2018static void sfp_shutdown(struct platform_device *pdev)
2019{
2020 struct sfp *sfp = platform_get_drvdata(pdev);
2021 int i;
2022
2023 for (i = 0; i < GPIO_MAX; i++) {
2024 if (!sfp->gpio_irq[i])
2025 continue;
2026
2027 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp);
2028 }
2029
2030 cancel_delayed_work_sync(&sfp->poll);
2031 cancel_delayed_work_sync(&sfp->timeout);
2032}
2033
2034static struct platform_driver sfp_driver = {
2035 .probe = sfp_probe,
2036 .remove = sfp_remove,
2037 .shutdown = sfp_shutdown,
2038 .driver = {
2039 .name = "sfp",
2040 .of_match_table = sfp_of_match,
2041 },
2042};
2043
2044static int sfp_init(void)
2045{
2046 poll_jiffies = msecs_to_jiffies(100);
2047
2048 return platform_driver_register(&sfp_driver);
2049}
2050module_init(sfp_init);
2051
2052static void sfp_exit(void)
2053{
2054 platform_driver_unregister(&sfp_driver);
2055}
2056module_exit(sfp_exit);
2057
2058MODULE_ALIAS("platform:sfp");
2059MODULE_AUTHOR("Russell King");
2060MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/acpi.h>
3#include <linux/ctype.h>
4#include <linux/debugfs.h>
5#include <linux/delay.h>
6#include <linux/gpio/consumer.h>
7#include <linux/hwmon.h>
8#include <linux/i2c.h>
9#include <linux/interrupt.h>
10#include <linux/jiffies.h>
11#include <linux/mdio/mdio-i2c.h>
12#include <linux/module.h>
13#include <linux/mutex.h>
14#include <linux/of.h>
15#include <linux/phy.h>
16#include <linux/platform_device.h>
17#include <linux/rtnetlink.h>
18#include <linux/slab.h>
19#include <linux/workqueue.h>
20
21#include "sfp.h"
22#include "swphy.h"
23
24enum {
25 GPIO_MODDEF0,
26 GPIO_LOS,
27 GPIO_TX_FAULT,
28 GPIO_TX_DISABLE,
29 GPIO_RATE_SELECT,
30 GPIO_MAX,
31
32 SFP_F_PRESENT = BIT(GPIO_MODDEF0),
33 SFP_F_LOS = BIT(GPIO_LOS),
34 SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
35 SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
36 SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
37
38 SFP_E_INSERT = 0,
39 SFP_E_REMOVE,
40 SFP_E_DEV_ATTACH,
41 SFP_E_DEV_DETACH,
42 SFP_E_DEV_DOWN,
43 SFP_E_DEV_UP,
44 SFP_E_TX_FAULT,
45 SFP_E_TX_CLEAR,
46 SFP_E_LOS_HIGH,
47 SFP_E_LOS_LOW,
48 SFP_E_TIMEOUT,
49
50 SFP_MOD_EMPTY = 0,
51 SFP_MOD_ERROR,
52 SFP_MOD_PROBE,
53 SFP_MOD_WAITDEV,
54 SFP_MOD_HPOWER,
55 SFP_MOD_WAITPWR,
56 SFP_MOD_PRESENT,
57
58 SFP_DEV_DETACHED = 0,
59 SFP_DEV_DOWN,
60 SFP_DEV_UP,
61
62 SFP_S_DOWN = 0,
63 SFP_S_FAIL,
64 SFP_S_WAIT,
65 SFP_S_INIT,
66 SFP_S_INIT_PHY,
67 SFP_S_INIT_TX_FAULT,
68 SFP_S_WAIT_LOS,
69 SFP_S_LINK_UP,
70 SFP_S_TX_FAULT,
71 SFP_S_REINIT,
72 SFP_S_TX_DISABLE,
73};
74
75static const char * const mod_state_strings[] = {
76 [SFP_MOD_EMPTY] = "empty",
77 [SFP_MOD_ERROR] = "error",
78 [SFP_MOD_PROBE] = "probe",
79 [SFP_MOD_WAITDEV] = "waitdev",
80 [SFP_MOD_HPOWER] = "hpower",
81 [SFP_MOD_WAITPWR] = "waitpwr",
82 [SFP_MOD_PRESENT] = "present",
83};
84
85static const char *mod_state_to_str(unsigned short mod_state)
86{
87 if (mod_state >= ARRAY_SIZE(mod_state_strings))
88 return "Unknown module state";
89 return mod_state_strings[mod_state];
90}
91
92static const char * const dev_state_strings[] = {
93 [SFP_DEV_DETACHED] = "detached",
94 [SFP_DEV_DOWN] = "down",
95 [SFP_DEV_UP] = "up",
96};
97
98static const char *dev_state_to_str(unsigned short dev_state)
99{
100 if (dev_state >= ARRAY_SIZE(dev_state_strings))
101 return "Unknown device state";
102 return dev_state_strings[dev_state];
103}
104
105static const char * const event_strings[] = {
106 [SFP_E_INSERT] = "insert",
107 [SFP_E_REMOVE] = "remove",
108 [SFP_E_DEV_ATTACH] = "dev_attach",
109 [SFP_E_DEV_DETACH] = "dev_detach",
110 [SFP_E_DEV_DOWN] = "dev_down",
111 [SFP_E_DEV_UP] = "dev_up",
112 [SFP_E_TX_FAULT] = "tx_fault",
113 [SFP_E_TX_CLEAR] = "tx_clear",
114 [SFP_E_LOS_HIGH] = "los_high",
115 [SFP_E_LOS_LOW] = "los_low",
116 [SFP_E_TIMEOUT] = "timeout",
117};
118
119static const char *event_to_str(unsigned short event)
120{
121 if (event >= ARRAY_SIZE(event_strings))
122 return "Unknown event";
123 return event_strings[event];
124}
125
126static const char * const sm_state_strings[] = {
127 [SFP_S_DOWN] = "down",
128 [SFP_S_FAIL] = "fail",
129 [SFP_S_WAIT] = "wait",
130 [SFP_S_INIT] = "init",
131 [SFP_S_INIT_PHY] = "init_phy",
132 [SFP_S_INIT_TX_FAULT] = "init_tx_fault",
133 [SFP_S_WAIT_LOS] = "wait_los",
134 [SFP_S_LINK_UP] = "link_up",
135 [SFP_S_TX_FAULT] = "tx_fault",
136 [SFP_S_REINIT] = "reinit",
137 [SFP_S_TX_DISABLE] = "tx_disable",
138};
139
140static const char *sm_state_to_str(unsigned short sm_state)
141{
142 if (sm_state >= ARRAY_SIZE(sm_state_strings))
143 return "Unknown state";
144 return sm_state_strings[sm_state];
145}
146
147static const char *gpio_of_names[] = {
148 "mod-def0",
149 "los",
150 "tx-fault",
151 "tx-disable",
152 "rate-select0",
153};
154
155static const enum gpiod_flags gpio_flags[] = {
156 GPIOD_IN,
157 GPIOD_IN,
158 GPIOD_IN,
159 GPIOD_ASIS,
160 GPIOD_ASIS,
161};
162
163/* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a
164 * non-cooled module to initialise its laser safety circuitry. We wait
165 * an initial T_WAIT period before we check the tx fault to give any PHY
166 * on board (for a copper SFP) time to initialise.
167 */
168#define T_WAIT msecs_to_jiffies(50)
169#define T_WAIT_ROLLBALL msecs_to_jiffies(25000)
170#define T_START_UP msecs_to_jiffies(300)
171#define T_START_UP_BAD_GPON msecs_to_jiffies(60000)
172
173/* t_reset is the time required to assert the TX_DISABLE signal to reset
174 * an indicated TX_FAULT.
175 */
176#define T_RESET_US 10
177#define T_FAULT_RECOVER msecs_to_jiffies(1000)
178
179/* N_FAULT_INIT is the number of recovery attempts at module initialisation
180 * time. If the TX_FAULT signal is not deasserted after this number of
181 * attempts at clearing it, we decide that the module is faulty.
182 * N_FAULT is the same but after the module has initialised.
183 */
184#define N_FAULT_INIT 5
185#define N_FAULT 5
186
187/* T_PHY_RETRY is the time interval between attempts to probe the PHY.
188 * R_PHY_RETRY is the number of attempts.
189 */
190#define T_PHY_RETRY msecs_to_jiffies(50)
191#define R_PHY_RETRY 12
192
193/* SFP module presence detection is poor: the three MOD DEF signals are
194 * the same length on the PCB, which means it's possible for MOD DEF 0 to
195 * connect before the I2C bus on MOD DEF 1/2.
196 *
197 * The SFF-8472 specifies t_serial ("Time from power on until module is
198 * ready for data transmission over the two wire serial bus.") as 300ms.
199 */
200#define T_SERIAL msecs_to_jiffies(300)
201#define T_HPOWER_LEVEL msecs_to_jiffies(300)
202#define T_PROBE_RETRY_INIT msecs_to_jiffies(100)
203#define R_PROBE_RETRY_INIT 10
204#define T_PROBE_RETRY_SLOW msecs_to_jiffies(5000)
205#define R_PROBE_RETRY_SLOW 12
206
207/* SFP modules appear to always have their PHY configured for bus address
208 * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
209 * RollBall SFPs access phy via SFP Enhanced Digital Diagnostic Interface
210 * via address 0x51 (mdio-i2c will use RollBall protocol on this address).
211 */
212#define SFP_PHY_ADDR 22
213#define SFP_PHY_ADDR_ROLLBALL 17
214
215struct sff_data {
216 unsigned int gpios;
217 bool (*module_supported)(const struct sfp_eeprom_id *id);
218};
219
220struct sfp {
221 struct device *dev;
222 struct i2c_adapter *i2c;
223 struct mii_bus *i2c_mii;
224 struct sfp_bus *sfp_bus;
225 enum mdio_i2c_proto mdio_protocol;
226 struct phy_device *mod_phy;
227 const struct sff_data *type;
228 size_t i2c_block_size;
229 u32 max_power_mW;
230
231 unsigned int (*get_state)(struct sfp *);
232 void (*set_state)(struct sfp *, unsigned int);
233 int (*read)(struct sfp *, bool, u8, void *, size_t);
234 int (*write)(struct sfp *, bool, u8, void *, size_t);
235
236 struct gpio_desc *gpio[GPIO_MAX];
237 int gpio_irq[GPIO_MAX];
238
239 bool need_poll;
240
241 struct mutex st_mutex; /* Protects state */
242 unsigned int state_hw_mask;
243 unsigned int state_soft_mask;
244 unsigned int state;
245 struct delayed_work poll;
246 struct delayed_work timeout;
247 struct mutex sm_mutex; /* Protects state machine */
248 unsigned char sm_mod_state;
249 unsigned char sm_mod_tries_init;
250 unsigned char sm_mod_tries;
251 unsigned char sm_dev_state;
252 unsigned short sm_state;
253 unsigned char sm_fault_retries;
254 unsigned char sm_phy_retries;
255
256 struct sfp_eeprom_id id;
257 unsigned int module_power_mW;
258 unsigned int module_t_start_up;
259 unsigned int module_t_wait;
260 bool tx_fault_ignore;
261
262 const struct sfp_quirk *quirk;
263
264#if IS_ENABLED(CONFIG_HWMON)
265 struct sfp_diag diag;
266 struct delayed_work hwmon_probe;
267 unsigned int hwmon_tries;
268 struct device *hwmon_dev;
269 char *hwmon_name;
270#endif
271
272#if IS_ENABLED(CONFIG_DEBUG_FS)
273 struct dentry *debugfs_dir;
274#endif
275};
276
277static bool sff_module_supported(const struct sfp_eeprom_id *id)
278{
279 return id->base.phys_id == SFF8024_ID_SFF_8472 &&
280 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
281}
282
283static const struct sff_data sff_data = {
284 .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
285 .module_supported = sff_module_supported,
286};
287
288static bool sfp_module_supported(const struct sfp_eeprom_id *id)
289{
290 if (id->base.phys_id == SFF8024_ID_SFP &&
291 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP)
292 return true;
293
294 /* SFP GPON module Ubiquiti U-Fiber Instant has in its EEPROM stored
295 * phys id SFF instead of SFP. Therefore mark this module explicitly
296 * as supported based on vendor name and pn match.
297 */
298 if (id->base.phys_id == SFF8024_ID_SFF_8472 &&
299 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP &&
300 !memcmp(id->base.vendor_name, "UBNT ", 16) &&
301 !memcmp(id->base.vendor_pn, "UF-INSTANT ", 16))
302 return true;
303
304 return false;
305}
306
307static const struct sff_data sfp_data = {
308 .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
309 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
310 .module_supported = sfp_module_supported,
311};
312
313static const struct of_device_id sfp_of_match[] = {
314 { .compatible = "sff,sff", .data = &sff_data, },
315 { .compatible = "sff,sfp", .data = &sfp_data, },
316 { },
317};
318MODULE_DEVICE_TABLE(of, sfp_of_match);
319
320static void sfp_fixup_long_startup(struct sfp *sfp)
321{
322 sfp->module_t_start_up = T_START_UP_BAD_GPON;
323}
324
325static void sfp_fixup_ignore_tx_fault(struct sfp *sfp)
326{
327 sfp->tx_fault_ignore = true;
328}
329
330static void sfp_fixup_halny_gsfp(struct sfp *sfp)
331{
332 /* Ignore the TX_FAULT and LOS signals on this module.
333 * these are possibly used for other purposes on this
334 * module, e.g. a serial port.
335 */
336 sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
337}
338
339static void sfp_fixup_rollball(struct sfp *sfp)
340{
341 sfp->mdio_protocol = MDIO_I2C_ROLLBALL;
342 sfp->module_t_wait = T_WAIT_ROLLBALL;
343}
344
345static void sfp_fixup_rollball_cc(struct sfp *sfp)
346{
347 sfp_fixup_rollball(sfp);
348
349 /* Some RollBall SFPs may have wrong (zero) extended compliance code
350 * burned in EEPROM. For PHY probing we need the correct one.
351 */
352 sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SFI;
353}
354
355static void sfp_quirk_2500basex(const struct sfp_eeprom_id *id,
356 unsigned long *modes,
357 unsigned long *interfaces)
358{
359 linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, modes);
360 __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces);
361}
362
363static void sfp_quirk_ubnt_uf_instant(const struct sfp_eeprom_id *id,
364 unsigned long *modes,
365 unsigned long *interfaces)
366{
367 /* Ubiquiti U-Fiber Instant module claims that support all transceiver
368 * types including 10G Ethernet which is not truth. So clear all claimed
369 * modes and set only one mode which module supports: 1000baseX_Full.
370 */
371 linkmode_zero(modes);
372 linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, modes);
373}
374
375#define SFP_QUIRK(_v, _p, _m, _f) \
376 { .vendor = _v, .part = _p, .modes = _m, .fixup = _f, }
377#define SFP_QUIRK_M(_v, _p, _m) SFP_QUIRK(_v, _p, _m, NULL)
378#define SFP_QUIRK_F(_v, _p, _f) SFP_QUIRK(_v, _p, NULL, _f)
379
380static const struct sfp_quirk sfp_quirks[] = {
381 // Alcatel Lucent G-010S-P can operate at 2500base-X, but incorrectly
382 // report 2500MBd NRZ in their EEPROM
383 SFP_QUIRK_M("ALCATELLUCENT", "G010SP", sfp_quirk_2500basex),
384
385 // Alcatel Lucent G-010S-A can operate at 2500base-X, but report 3.2GBd
386 // NRZ in their EEPROM
387 SFP_QUIRK("ALCATELLUCENT", "3FE46541AA", sfp_quirk_2500basex,
388 sfp_fixup_long_startup),
389
390 SFP_QUIRK_F("HALNy", "HL-GSFP", sfp_fixup_halny_gsfp),
391
392 // Huawei MA5671A can operate at 2500base-X, but report 1.2GBd NRZ in
393 // their EEPROM
394 SFP_QUIRK("HUAWEI", "MA5671A", sfp_quirk_2500basex,
395 sfp_fixup_ignore_tx_fault),
396
397 // Lantech 8330-262D-E can operate at 2500base-X, but incorrectly report
398 // 2500MBd NRZ in their EEPROM
399 SFP_QUIRK_M("Lantech", "8330-262D-E", sfp_quirk_2500basex),
400
401 SFP_QUIRK_M("UBNT", "UF-INSTANT", sfp_quirk_ubnt_uf_instant),
402
403 SFP_QUIRK_F("OEM", "SFP-10G-T", sfp_fixup_rollball_cc),
404 SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc),
405 SFP_QUIRK_F("OEM", "RTSFP-10G", sfp_fixup_rollball_cc),
406 SFP_QUIRK_F("Turris", "RTSFP-10", sfp_fixup_rollball),
407 SFP_QUIRK_F("Turris", "RTSFP-10G", sfp_fixup_rollball),
408};
409
410static size_t sfp_strlen(const char *str, size_t maxlen)
411{
412 size_t size, i;
413
414 /* Trailing characters should be filled with space chars, but
415 * some manufacturers can't read SFF-8472 and use NUL.
416 */
417 for (i = 0, size = 0; i < maxlen; i++)
418 if (str[i] != ' ' && str[i] != '\0')
419 size = i + 1;
420
421 return size;
422}
423
424static bool sfp_match(const char *qs, const char *str, size_t len)
425{
426 if (!qs)
427 return true;
428 if (strlen(qs) != len)
429 return false;
430 return !strncmp(qs, str, len);
431}
432
433static const struct sfp_quirk *sfp_lookup_quirk(const struct sfp_eeprom_id *id)
434{
435 const struct sfp_quirk *q;
436 unsigned int i;
437 size_t vs, ps;
438
439 vs = sfp_strlen(id->base.vendor_name, ARRAY_SIZE(id->base.vendor_name));
440 ps = sfp_strlen(id->base.vendor_pn, ARRAY_SIZE(id->base.vendor_pn));
441
442 for (i = 0, q = sfp_quirks; i < ARRAY_SIZE(sfp_quirks); i++, q++)
443 if (sfp_match(q->vendor, id->base.vendor_name, vs) &&
444 sfp_match(q->part, id->base.vendor_pn, ps))
445 return q;
446
447 return NULL;
448}
449
450static unsigned long poll_jiffies;
451
452static unsigned int sfp_gpio_get_state(struct sfp *sfp)
453{
454 unsigned int i, state, v;
455
456 for (i = state = 0; i < GPIO_MAX; i++) {
457 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
458 continue;
459
460 v = gpiod_get_value_cansleep(sfp->gpio[i]);
461 if (v)
462 state |= BIT(i);
463 }
464
465 return state;
466}
467
468static unsigned int sff_gpio_get_state(struct sfp *sfp)
469{
470 return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
471}
472
473static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
474{
475 if (state & SFP_F_PRESENT) {
476 /* If the module is present, drive the signals */
477 if (sfp->gpio[GPIO_TX_DISABLE])
478 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
479 state & SFP_F_TX_DISABLE);
480 if (state & SFP_F_RATE_SELECT)
481 gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
482 state & SFP_F_RATE_SELECT);
483 } else {
484 /* Otherwise, let them float to the pull-ups */
485 if (sfp->gpio[GPIO_TX_DISABLE])
486 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
487 if (state & SFP_F_RATE_SELECT)
488 gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
489 }
490}
491
492static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
493 size_t len)
494{
495 struct i2c_msg msgs[2];
496 u8 bus_addr = a2 ? 0x51 : 0x50;
497 size_t block_size = sfp->i2c_block_size;
498 size_t this_len;
499 int ret;
500
501 msgs[0].addr = bus_addr;
502 msgs[0].flags = 0;
503 msgs[0].len = 1;
504 msgs[0].buf = &dev_addr;
505 msgs[1].addr = bus_addr;
506 msgs[1].flags = I2C_M_RD;
507 msgs[1].len = len;
508 msgs[1].buf = buf;
509
510 while (len) {
511 this_len = len;
512 if (this_len > block_size)
513 this_len = block_size;
514
515 msgs[1].len = this_len;
516
517 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
518 if (ret < 0)
519 return ret;
520
521 if (ret != ARRAY_SIZE(msgs))
522 break;
523
524 msgs[1].buf += this_len;
525 dev_addr += this_len;
526 len -= this_len;
527 }
528
529 return msgs[1].buf - (u8 *)buf;
530}
531
532static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
533 size_t len)
534{
535 struct i2c_msg msgs[1];
536 u8 bus_addr = a2 ? 0x51 : 0x50;
537 int ret;
538
539 msgs[0].addr = bus_addr;
540 msgs[0].flags = 0;
541 msgs[0].len = 1 + len;
542 msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
543 if (!msgs[0].buf)
544 return -ENOMEM;
545
546 msgs[0].buf[0] = dev_addr;
547 memcpy(&msgs[0].buf[1], buf, len);
548
549 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
550
551 kfree(msgs[0].buf);
552
553 if (ret < 0)
554 return ret;
555
556 return ret == ARRAY_SIZE(msgs) ? len : 0;
557}
558
559static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
560{
561 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
562 return -EINVAL;
563
564 sfp->i2c = i2c;
565 sfp->read = sfp_i2c_read;
566 sfp->write = sfp_i2c_write;
567
568 return 0;
569}
570
571static int sfp_i2c_mdiobus_create(struct sfp *sfp)
572{
573 struct mii_bus *i2c_mii;
574 int ret;
575
576 i2c_mii = mdio_i2c_alloc(sfp->dev, sfp->i2c, sfp->mdio_protocol);
577 if (IS_ERR(i2c_mii))
578 return PTR_ERR(i2c_mii);
579
580 i2c_mii->name = "SFP I2C Bus";
581 i2c_mii->phy_mask = ~0;
582
583 ret = mdiobus_register(i2c_mii);
584 if (ret < 0) {
585 mdiobus_free(i2c_mii);
586 return ret;
587 }
588
589 sfp->i2c_mii = i2c_mii;
590
591 return 0;
592}
593
594static void sfp_i2c_mdiobus_destroy(struct sfp *sfp)
595{
596 mdiobus_unregister(sfp->i2c_mii);
597 sfp->i2c_mii = NULL;
598}
599
600/* Interface */
601static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
602{
603 return sfp->read(sfp, a2, addr, buf, len);
604}
605
606static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
607{
608 return sfp->write(sfp, a2, addr, buf, len);
609}
610
611static int sfp_modify_u8(struct sfp *sfp, bool a2, u8 addr, u8 mask, u8 val)
612{
613 int ret;
614 u8 old, v;
615
616 ret = sfp_read(sfp, a2, addr, &old, sizeof(old));
617 if (ret != sizeof(old))
618 return ret;
619
620 v = (old & ~mask) | (val & mask);
621 if (v == old)
622 return sizeof(v);
623
624 return sfp_write(sfp, a2, addr, &v, sizeof(v));
625}
626
627static unsigned int sfp_soft_get_state(struct sfp *sfp)
628{
629 unsigned int state = 0;
630 u8 status;
631 int ret;
632
633 ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status));
634 if (ret == sizeof(status)) {
635 if (status & SFP_STATUS_RX_LOS)
636 state |= SFP_F_LOS;
637 if (status & SFP_STATUS_TX_FAULT)
638 state |= SFP_F_TX_FAULT;
639 } else {
640 dev_err_ratelimited(sfp->dev,
641 "failed to read SFP soft status: %pe\n",
642 ERR_PTR(ret));
643 /* Preserve the current state */
644 state = sfp->state;
645 }
646
647 return state & sfp->state_soft_mask;
648}
649
650static void sfp_soft_set_state(struct sfp *sfp, unsigned int state)
651{
652 u8 mask = SFP_STATUS_TX_DISABLE_FORCE;
653 u8 val = 0;
654
655 if (state & SFP_F_TX_DISABLE)
656 val |= SFP_STATUS_TX_DISABLE_FORCE;
657
658
659 sfp_modify_u8(sfp, true, SFP_STATUS, mask, val);
660}
661
662static void sfp_soft_start_poll(struct sfp *sfp)
663{
664 const struct sfp_eeprom_id *id = &sfp->id;
665 unsigned int mask = 0;
666
667 sfp->state_soft_mask = 0;
668 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE)
669 mask |= SFP_F_TX_DISABLE;
670 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT)
671 mask |= SFP_F_TX_FAULT;
672 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS)
673 mask |= SFP_F_LOS;
674
675 // Poll the soft state for hardware pins we want to ignore
676 sfp->state_soft_mask = ~sfp->state_hw_mask & mask;
677
678 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
679 !sfp->need_poll)
680 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
681}
682
683static void sfp_soft_stop_poll(struct sfp *sfp)
684{
685 sfp->state_soft_mask = 0;
686}
687
688static unsigned int sfp_get_state(struct sfp *sfp)
689{
690 unsigned int soft = sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT);
691 unsigned int state;
692
693 state = sfp->get_state(sfp) & sfp->state_hw_mask;
694 if (state & SFP_F_PRESENT && soft)
695 state |= sfp_soft_get_state(sfp);
696
697 return state;
698}
699
700static void sfp_set_state(struct sfp *sfp, unsigned int state)
701{
702 sfp->set_state(sfp, state);
703
704 if (state & SFP_F_PRESENT &&
705 sfp->state_soft_mask & SFP_F_TX_DISABLE)
706 sfp_soft_set_state(sfp, state);
707}
708
709static unsigned int sfp_check(void *buf, size_t len)
710{
711 u8 *p, check;
712
713 for (p = buf, check = 0; len; p++, len--)
714 check += *p;
715
716 return check;
717}
718
719/* hwmon */
720#if IS_ENABLED(CONFIG_HWMON)
721static umode_t sfp_hwmon_is_visible(const void *data,
722 enum hwmon_sensor_types type,
723 u32 attr, int channel)
724{
725 const struct sfp *sfp = data;
726
727 switch (type) {
728 case hwmon_temp:
729 switch (attr) {
730 case hwmon_temp_min_alarm:
731 case hwmon_temp_max_alarm:
732 case hwmon_temp_lcrit_alarm:
733 case hwmon_temp_crit_alarm:
734 case hwmon_temp_min:
735 case hwmon_temp_max:
736 case hwmon_temp_lcrit:
737 case hwmon_temp_crit:
738 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
739 return 0;
740 fallthrough;
741 case hwmon_temp_input:
742 case hwmon_temp_label:
743 return 0444;
744 default:
745 return 0;
746 }
747 case hwmon_in:
748 switch (attr) {
749 case hwmon_in_min_alarm:
750 case hwmon_in_max_alarm:
751 case hwmon_in_lcrit_alarm:
752 case hwmon_in_crit_alarm:
753 case hwmon_in_min:
754 case hwmon_in_max:
755 case hwmon_in_lcrit:
756 case hwmon_in_crit:
757 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
758 return 0;
759 fallthrough;
760 case hwmon_in_input:
761 case hwmon_in_label:
762 return 0444;
763 default:
764 return 0;
765 }
766 case hwmon_curr:
767 switch (attr) {
768 case hwmon_curr_min_alarm:
769 case hwmon_curr_max_alarm:
770 case hwmon_curr_lcrit_alarm:
771 case hwmon_curr_crit_alarm:
772 case hwmon_curr_min:
773 case hwmon_curr_max:
774 case hwmon_curr_lcrit:
775 case hwmon_curr_crit:
776 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
777 return 0;
778 fallthrough;
779 case hwmon_curr_input:
780 case hwmon_curr_label:
781 return 0444;
782 default:
783 return 0;
784 }
785 case hwmon_power:
786 /* External calibration of receive power requires
787 * floating point arithmetic. Doing that in the kernel
788 * is not easy, so just skip it. If the module does
789 * not require external calibration, we can however
790 * show receiver power, since FP is then not needed.
791 */
792 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
793 channel == 1)
794 return 0;
795 switch (attr) {
796 case hwmon_power_min_alarm:
797 case hwmon_power_max_alarm:
798 case hwmon_power_lcrit_alarm:
799 case hwmon_power_crit_alarm:
800 case hwmon_power_min:
801 case hwmon_power_max:
802 case hwmon_power_lcrit:
803 case hwmon_power_crit:
804 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
805 return 0;
806 fallthrough;
807 case hwmon_power_input:
808 case hwmon_power_label:
809 return 0444;
810 default:
811 return 0;
812 }
813 default:
814 return 0;
815 }
816}
817
818static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
819{
820 __be16 val;
821 int err;
822
823 err = sfp_read(sfp, true, reg, &val, sizeof(val));
824 if (err < 0)
825 return err;
826
827 *value = be16_to_cpu(val);
828
829 return 0;
830}
831
832static void sfp_hwmon_to_rx_power(long *value)
833{
834 *value = DIV_ROUND_CLOSEST(*value, 10);
835}
836
837static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
838 long *value)
839{
840 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
841 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
842}
843
844static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
845{
846 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
847 be16_to_cpu(sfp->diag.cal_t_offset), value);
848
849 if (*value >= 0x8000)
850 *value -= 0x10000;
851
852 *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
853}
854
855static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
856{
857 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
858 be16_to_cpu(sfp->diag.cal_v_offset), value);
859
860 *value = DIV_ROUND_CLOSEST(*value, 10);
861}
862
863static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
864{
865 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
866 be16_to_cpu(sfp->diag.cal_txi_offset), value);
867
868 *value = DIV_ROUND_CLOSEST(*value, 500);
869}
870
871static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
872{
873 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
874 be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
875
876 *value = DIV_ROUND_CLOSEST(*value, 10);
877}
878
879static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
880{
881 int err;
882
883 err = sfp_hwmon_read_sensor(sfp, reg, value);
884 if (err < 0)
885 return err;
886
887 sfp_hwmon_calibrate_temp(sfp, value);
888
889 return 0;
890}
891
892static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
893{
894 int err;
895
896 err = sfp_hwmon_read_sensor(sfp, reg, value);
897 if (err < 0)
898 return err;
899
900 sfp_hwmon_calibrate_vcc(sfp, value);
901
902 return 0;
903}
904
905static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
906{
907 int err;
908
909 err = sfp_hwmon_read_sensor(sfp, reg, value);
910 if (err < 0)
911 return err;
912
913 sfp_hwmon_calibrate_bias(sfp, value);
914
915 return 0;
916}
917
918static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
919{
920 int err;
921
922 err = sfp_hwmon_read_sensor(sfp, reg, value);
923 if (err < 0)
924 return err;
925
926 sfp_hwmon_calibrate_tx_power(sfp, value);
927
928 return 0;
929}
930
931static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
932{
933 int err;
934
935 err = sfp_hwmon_read_sensor(sfp, reg, value);
936 if (err < 0)
937 return err;
938
939 sfp_hwmon_to_rx_power(value);
940
941 return 0;
942}
943
944static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
945{
946 u8 status;
947 int err;
948
949 switch (attr) {
950 case hwmon_temp_input:
951 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
952
953 case hwmon_temp_lcrit:
954 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
955 sfp_hwmon_calibrate_temp(sfp, value);
956 return 0;
957
958 case hwmon_temp_min:
959 *value = be16_to_cpu(sfp->diag.temp_low_warn);
960 sfp_hwmon_calibrate_temp(sfp, value);
961 return 0;
962 case hwmon_temp_max:
963 *value = be16_to_cpu(sfp->diag.temp_high_warn);
964 sfp_hwmon_calibrate_temp(sfp, value);
965 return 0;
966
967 case hwmon_temp_crit:
968 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
969 sfp_hwmon_calibrate_temp(sfp, value);
970 return 0;
971
972 case hwmon_temp_lcrit_alarm:
973 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
974 if (err < 0)
975 return err;
976
977 *value = !!(status & SFP_ALARM0_TEMP_LOW);
978 return 0;
979
980 case hwmon_temp_min_alarm:
981 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
982 if (err < 0)
983 return err;
984
985 *value = !!(status & SFP_WARN0_TEMP_LOW);
986 return 0;
987
988 case hwmon_temp_max_alarm:
989 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
990 if (err < 0)
991 return err;
992
993 *value = !!(status & SFP_WARN0_TEMP_HIGH);
994 return 0;
995
996 case hwmon_temp_crit_alarm:
997 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
998 if (err < 0)
999 return err;
1000
1001 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
1002 return 0;
1003 default:
1004 return -EOPNOTSUPP;
1005 }
1006
1007 return -EOPNOTSUPP;
1008}
1009
1010static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
1011{
1012 u8 status;
1013 int err;
1014
1015 switch (attr) {
1016 case hwmon_in_input:
1017 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
1018
1019 case hwmon_in_lcrit:
1020 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
1021 sfp_hwmon_calibrate_vcc(sfp, value);
1022 return 0;
1023
1024 case hwmon_in_min:
1025 *value = be16_to_cpu(sfp->diag.volt_low_warn);
1026 sfp_hwmon_calibrate_vcc(sfp, value);
1027 return 0;
1028
1029 case hwmon_in_max:
1030 *value = be16_to_cpu(sfp->diag.volt_high_warn);
1031 sfp_hwmon_calibrate_vcc(sfp, value);
1032 return 0;
1033
1034 case hwmon_in_crit:
1035 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
1036 sfp_hwmon_calibrate_vcc(sfp, value);
1037 return 0;
1038
1039 case hwmon_in_lcrit_alarm:
1040 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1041 if (err < 0)
1042 return err;
1043
1044 *value = !!(status & SFP_ALARM0_VCC_LOW);
1045 return 0;
1046
1047 case hwmon_in_min_alarm:
1048 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1049 if (err < 0)
1050 return err;
1051
1052 *value = !!(status & SFP_WARN0_VCC_LOW);
1053 return 0;
1054
1055 case hwmon_in_max_alarm:
1056 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1057 if (err < 0)
1058 return err;
1059
1060 *value = !!(status & SFP_WARN0_VCC_HIGH);
1061 return 0;
1062
1063 case hwmon_in_crit_alarm:
1064 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1065 if (err < 0)
1066 return err;
1067
1068 *value = !!(status & SFP_ALARM0_VCC_HIGH);
1069 return 0;
1070 default:
1071 return -EOPNOTSUPP;
1072 }
1073
1074 return -EOPNOTSUPP;
1075}
1076
1077static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
1078{
1079 u8 status;
1080 int err;
1081
1082 switch (attr) {
1083 case hwmon_curr_input:
1084 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
1085
1086 case hwmon_curr_lcrit:
1087 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
1088 sfp_hwmon_calibrate_bias(sfp, value);
1089 return 0;
1090
1091 case hwmon_curr_min:
1092 *value = be16_to_cpu(sfp->diag.bias_low_warn);
1093 sfp_hwmon_calibrate_bias(sfp, value);
1094 return 0;
1095
1096 case hwmon_curr_max:
1097 *value = be16_to_cpu(sfp->diag.bias_high_warn);
1098 sfp_hwmon_calibrate_bias(sfp, value);
1099 return 0;
1100
1101 case hwmon_curr_crit:
1102 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
1103 sfp_hwmon_calibrate_bias(sfp, value);
1104 return 0;
1105
1106 case hwmon_curr_lcrit_alarm:
1107 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1108 if (err < 0)
1109 return err;
1110
1111 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
1112 return 0;
1113
1114 case hwmon_curr_min_alarm:
1115 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1116 if (err < 0)
1117 return err;
1118
1119 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
1120 return 0;
1121
1122 case hwmon_curr_max_alarm:
1123 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1124 if (err < 0)
1125 return err;
1126
1127 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
1128 return 0;
1129
1130 case hwmon_curr_crit_alarm:
1131 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1132 if (err < 0)
1133 return err;
1134
1135 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
1136 return 0;
1137 default:
1138 return -EOPNOTSUPP;
1139 }
1140
1141 return -EOPNOTSUPP;
1142}
1143
1144static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
1145{
1146 u8 status;
1147 int err;
1148
1149 switch (attr) {
1150 case hwmon_power_input:
1151 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
1152
1153 case hwmon_power_lcrit:
1154 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
1155 sfp_hwmon_calibrate_tx_power(sfp, value);
1156 return 0;
1157
1158 case hwmon_power_min:
1159 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
1160 sfp_hwmon_calibrate_tx_power(sfp, value);
1161 return 0;
1162
1163 case hwmon_power_max:
1164 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
1165 sfp_hwmon_calibrate_tx_power(sfp, value);
1166 return 0;
1167
1168 case hwmon_power_crit:
1169 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
1170 sfp_hwmon_calibrate_tx_power(sfp, value);
1171 return 0;
1172
1173 case hwmon_power_lcrit_alarm:
1174 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1175 if (err < 0)
1176 return err;
1177
1178 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
1179 return 0;
1180
1181 case hwmon_power_min_alarm:
1182 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1183 if (err < 0)
1184 return err;
1185
1186 *value = !!(status & SFP_WARN0_TXPWR_LOW);
1187 return 0;
1188
1189 case hwmon_power_max_alarm:
1190 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1191 if (err < 0)
1192 return err;
1193
1194 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
1195 return 0;
1196
1197 case hwmon_power_crit_alarm:
1198 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1199 if (err < 0)
1200 return err;
1201
1202 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
1203 return 0;
1204 default:
1205 return -EOPNOTSUPP;
1206 }
1207
1208 return -EOPNOTSUPP;
1209}
1210
1211static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
1212{
1213 u8 status;
1214 int err;
1215
1216 switch (attr) {
1217 case hwmon_power_input:
1218 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
1219
1220 case hwmon_power_lcrit:
1221 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
1222 sfp_hwmon_to_rx_power(value);
1223 return 0;
1224
1225 case hwmon_power_min:
1226 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
1227 sfp_hwmon_to_rx_power(value);
1228 return 0;
1229
1230 case hwmon_power_max:
1231 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
1232 sfp_hwmon_to_rx_power(value);
1233 return 0;
1234
1235 case hwmon_power_crit:
1236 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
1237 sfp_hwmon_to_rx_power(value);
1238 return 0;
1239
1240 case hwmon_power_lcrit_alarm:
1241 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1242 if (err < 0)
1243 return err;
1244
1245 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
1246 return 0;
1247
1248 case hwmon_power_min_alarm:
1249 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1250 if (err < 0)
1251 return err;
1252
1253 *value = !!(status & SFP_WARN1_RXPWR_LOW);
1254 return 0;
1255
1256 case hwmon_power_max_alarm:
1257 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1258 if (err < 0)
1259 return err;
1260
1261 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
1262 return 0;
1263
1264 case hwmon_power_crit_alarm:
1265 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1266 if (err < 0)
1267 return err;
1268
1269 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
1270 return 0;
1271 default:
1272 return -EOPNOTSUPP;
1273 }
1274
1275 return -EOPNOTSUPP;
1276}
1277
1278static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
1279 u32 attr, int channel, long *value)
1280{
1281 struct sfp *sfp = dev_get_drvdata(dev);
1282
1283 switch (type) {
1284 case hwmon_temp:
1285 return sfp_hwmon_temp(sfp, attr, value);
1286 case hwmon_in:
1287 return sfp_hwmon_vcc(sfp, attr, value);
1288 case hwmon_curr:
1289 return sfp_hwmon_bias(sfp, attr, value);
1290 case hwmon_power:
1291 switch (channel) {
1292 case 0:
1293 return sfp_hwmon_tx_power(sfp, attr, value);
1294 case 1:
1295 return sfp_hwmon_rx_power(sfp, attr, value);
1296 default:
1297 return -EOPNOTSUPP;
1298 }
1299 default:
1300 return -EOPNOTSUPP;
1301 }
1302}
1303
1304static const char *const sfp_hwmon_power_labels[] = {
1305 "TX_power",
1306 "RX_power",
1307};
1308
1309static int sfp_hwmon_read_string(struct device *dev,
1310 enum hwmon_sensor_types type,
1311 u32 attr, int channel, const char **str)
1312{
1313 switch (type) {
1314 case hwmon_curr:
1315 switch (attr) {
1316 case hwmon_curr_label:
1317 *str = "bias";
1318 return 0;
1319 default:
1320 return -EOPNOTSUPP;
1321 }
1322 break;
1323 case hwmon_temp:
1324 switch (attr) {
1325 case hwmon_temp_label:
1326 *str = "temperature";
1327 return 0;
1328 default:
1329 return -EOPNOTSUPP;
1330 }
1331 break;
1332 case hwmon_in:
1333 switch (attr) {
1334 case hwmon_in_label:
1335 *str = "VCC";
1336 return 0;
1337 default:
1338 return -EOPNOTSUPP;
1339 }
1340 break;
1341 case hwmon_power:
1342 switch (attr) {
1343 case hwmon_power_label:
1344 *str = sfp_hwmon_power_labels[channel];
1345 return 0;
1346 default:
1347 return -EOPNOTSUPP;
1348 }
1349 break;
1350 default:
1351 return -EOPNOTSUPP;
1352 }
1353
1354 return -EOPNOTSUPP;
1355}
1356
1357static const struct hwmon_ops sfp_hwmon_ops = {
1358 .is_visible = sfp_hwmon_is_visible,
1359 .read = sfp_hwmon_read,
1360 .read_string = sfp_hwmon_read_string,
1361};
1362
1363static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1364 HWMON_CHANNEL_INFO(chip,
1365 HWMON_C_REGISTER_TZ),
1366 HWMON_CHANNEL_INFO(in,
1367 HWMON_I_INPUT |
1368 HWMON_I_MAX | HWMON_I_MIN |
1369 HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1370 HWMON_I_CRIT | HWMON_I_LCRIT |
1371 HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM |
1372 HWMON_I_LABEL),
1373 HWMON_CHANNEL_INFO(temp,
1374 HWMON_T_INPUT |
1375 HWMON_T_MAX | HWMON_T_MIN |
1376 HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
1377 HWMON_T_CRIT | HWMON_T_LCRIT |
1378 HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM |
1379 HWMON_T_LABEL),
1380 HWMON_CHANNEL_INFO(curr,
1381 HWMON_C_INPUT |
1382 HWMON_C_MAX | HWMON_C_MIN |
1383 HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1384 HWMON_C_CRIT | HWMON_C_LCRIT |
1385 HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM |
1386 HWMON_C_LABEL),
1387 HWMON_CHANNEL_INFO(power,
1388 /* Transmit power */
1389 HWMON_P_INPUT |
1390 HWMON_P_MAX | HWMON_P_MIN |
1391 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1392 HWMON_P_CRIT | HWMON_P_LCRIT |
1393 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1394 HWMON_P_LABEL,
1395 /* Receive power */
1396 HWMON_P_INPUT |
1397 HWMON_P_MAX | HWMON_P_MIN |
1398 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1399 HWMON_P_CRIT | HWMON_P_LCRIT |
1400 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1401 HWMON_P_LABEL),
1402 NULL,
1403};
1404
1405static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1406 .ops = &sfp_hwmon_ops,
1407 .info = sfp_hwmon_info,
1408};
1409
1410static void sfp_hwmon_probe(struct work_struct *work)
1411{
1412 struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work);
1413 int err;
1414
1415 /* hwmon interface needs to access 16bit registers in atomic way to
1416 * guarantee coherency of the diagnostic monitoring data. If it is not
1417 * possible to guarantee coherency because EEPROM is broken in such way
1418 * that does not support atomic 16bit read operation then we have to
1419 * skip registration of hwmon device.
1420 */
1421 if (sfp->i2c_block_size < 2) {
1422 dev_info(sfp->dev,
1423 "skipping hwmon device registration due to broken EEPROM\n");
1424 dev_info(sfp->dev,
1425 "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n");
1426 return;
1427 }
1428
1429 err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1430 if (err < 0) {
1431 if (sfp->hwmon_tries--) {
1432 mod_delayed_work(system_wq, &sfp->hwmon_probe,
1433 T_PROBE_RETRY_SLOW);
1434 } else {
1435 dev_warn(sfp->dev, "hwmon probe failed: %pe\n",
1436 ERR_PTR(err));
1437 }
1438 return;
1439 }
1440
1441 sfp->hwmon_name = hwmon_sanitize_name(dev_name(sfp->dev));
1442 if (IS_ERR(sfp->hwmon_name)) {
1443 dev_err(sfp->dev, "out of memory for hwmon name\n");
1444 return;
1445 }
1446
1447 sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1448 sfp->hwmon_name, sfp,
1449 &sfp_hwmon_chip_info,
1450 NULL);
1451 if (IS_ERR(sfp->hwmon_dev))
1452 dev_err(sfp->dev, "failed to register hwmon device: %ld\n",
1453 PTR_ERR(sfp->hwmon_dev));
1454}
1455
1456static int sfp_hwmon_insert(struct sfp *sfp)
1457{
1458 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1459 return 0;
1460
1461 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1462 return 0;
1463
1464 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1465 /* This driver in general does not support address
1466 * change.
1467 */
1468 return 0;
1469
1470 mod_delayed_work(system_wq, &sfp->hwmon_probe, 1);
1471 sfp->hwmon_tries = R_PROBE_RETRY_SLOW;
1472
1473 return 0;
1474}
1475
1476static void sfp_hwmon_remove(struct sfp *sfp)
1477{
1478 cancel_delayed_work_sync(&sfp->hwmon_probe);
1479 if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1480 hwmon_device_unregister(sfp->hwmon_dev);
1481 sfp->hwmon_dev = NULL;
1482 kfree(sfp->hwmon_name);
1483 }
1484}
1485
1486static int sfp_hwmon_init(struct sfp *sfp)
1487{
1488 INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe);
1489
1490 return 0;
1491}
1492
1493static void sfp_hwmon_exit(struct sfp *sfp)
1494{
1495 cancel_delayed_work_sync(&sfp->hwmon_probe);
1496}
1497#else
1498static int sfp_hwmon_insert(struct sfp *sfp)
1499{
1500 return 0;
1501}
1502
1503static void sfp_hwmon_remove(struct sfp *sfp)
1504{
1505}
1506
1507static int sfp_hwmon_init(struct sfp *sfp)
1508{
1509 return 0;
1510}
1511
1512static void sfp_hwmon_exit(struct sfp *sfp)
1513{
1514}
1515#endif
1516
1517/* Helpers */
1518static void sfp_module_tx_disable(struct sfp *sfp)
1519{
1520 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1521 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1522 sfp->state |= SFP_F_TX_DISABLE;
1523 sfp_set_state(sfp, sfp->state);
1524}
1525
1526static void sfp_module_tx_enable(struct sfp *sfp)
1527{
1528 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1529 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1530 sfp->state &= ~SFP_F_TX_DISABLE;
1531 sfp_set_state(sfp, sfp->state);
1532}
1533
1534#if IS_ENABLED(CONFIG_DEBUG_FS)
1535static int sfp_debug_state_show(struct seq_file *s, void *data)
1536{
1537 struct sfp *sfp = s->private;
1538
1539 seq_printf(s, "Module state: %s\n",
1540 mod_state_to_str(sfp->sm_mod_state));
1541 seq_printf(s, "Module probe attempts: %d %d\n",
1542 R_PROBE_RETRY_INIT - sfp->sm_mod_tries_init,
1543 R_PROBE_RETRY_SLOW - sfp->sm_mod_tries);
1544 seq_printf(s, "Device state: %s\n",
1545 dev_state_to_str(sfp->sm_dev_state));
1546 seq_printf(s, "Main state: %s\n",
1547 sm_state_to_str(sfp->sm_state));
1548 seq_printf(s, "Fault recovery remaining retries: %d\n",
1549 sfp->sm_fault_retries);
1550 seq_printf(s, "PHY probe remaining retries: %d\n",
1551 sfp->sm_phy_retries);
1552 seq_printf(s, "moddef0: %d\n", !!(sfp->state & SFP_F_PRESENT));
1553 seq_printf(s, "rx_los: %d\n", !!(sfp->state & SFP_F_LOS));
1554 seq_printf(s, "tx_fault: %d\n", !!(sfp->state & SFP_F_TX_FAULT));
1555 seq_printf(s, "tx_disable: %d\n", !!(sfp->state & SFP_F_TX_DISABLE));
1556 return 0;
1557}
1558DEFINE_SHOW_ATTRIBUTE(sfp_debug_state);
1559
1560static void sfp_debugfs_init(struct sfp *sfp)
1561{
1562 sfp->debugfs_dir = debugfs_create_dir(dev_name(sfp->dev), NULL);
1563
1564 debugfs_create_file("state", 0600, sfp->debugfs_dir, sfp,
1565 &sfp_debug_state_fops);
1566}
1567
1568static void sfp_debugfs_exit(struct sfp *sfp)
1569{
1570 debugfs_remove_recursive(sfp->debugfs_dir);
1571}
1572#else
1573static void sfp_debugfs_init(struct sfp *sfp)
1574{
1575}
1576
1577static void sfp_debugfs_exit(struct sfp *sfp)
1578{
1579}
1580#endif
1581
1582static void sfp_module_tx_fault_reset(struct sfp *sfp)
1583{
1584 unsigned int state = sfp->state;
1585
1586 if (state & SFP_F_TX_DISABLE)
1587 return;
1588
1589 sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1590
1591 udelay(T_RESET_US);
1592
1593 sfp_set_state(sfp, state);
1594}
1595
1596/* SFP state machine */
1597static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1598{
1599 if (timeout)
1600 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1601 timeout);
1602 else
1603 cancel_delayed_work(&sfp->timeout);
1604}
1605
1606static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1607 unsigned int timeout)
1608{
1609 sfp->sm_state = state;
1610 sfp_sm_set_timer(sfp, timeout);
1611}
1612
1613static void sfp_sm_mod_next(struct sfp *sfp, unsigned int state,
1614 unsigned int timeout)
1615{
1616 sfp->sm_mod_state = state;
1617 sfp_sm_set_timer(sfp, timeout);
1618}
1619
1620static void sfp_sm_phy_detach(struct sfp *sfp)
1621{
1622 sfp_remove_phy(sfp->sfp_bus);
1623 phy_device_remove(sfp->mod_phy);
1624 phy_device_free(sfp->mod_phy);
1625 sfp->mod_phy = NULL;
1626}
1627
1628static int sfp_sm_probe_phy(struct sfp *sfp, int addr, bool is_c45)
1629{
1630 struct phy_device *phy;
1631 int err;
1632
1633 phy = get_phy_device(sfp->i2c_mii, addr, is_c45);
1634 if (phy == ERR_PTR(-ENODEV))
1635 return PTR_ERR(phy);
1636 if (IS_ERR(phy)) {
1637 dev_err(sfp->dev, "mdiobus scan returned %pe\n", phy);
1638 return PTR_ERR(phy);
1639 }
1640
1641 err = phy_device_register(phy);
1642 if (err) {
1643 phy_device_free(phy);
1644 dev_err(sfp->dev, "phy_device_register failed: %pe\n",
1645 ERR_PTR(err));
1646 return err;
1647 }
1648
1649 err = sfp_add_phy(sfp->sfp_bus, phy);
1650 if (err) {
1651 phy_device_remove(phy);
1652 phy_device_free(phy);
1653 dev_err(sfp->dev, "sfp_add_phy failed: %pe\n", ERR_PTR(err));
1654 return err;
1655 }
1656
1657 sfp->mod_phy = phy;
1658
1659 return 0;
1660}
1661
1662static void sfp_sm_link_up(struct sfp *sfp)
1663{
1664 sfp_link_up(sfp->sfp_bus);
1665 sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1666}
1667
1668static void sfp_sm_link_down(struct sfp *sfp)
1669{
1670 sfp_link_down(sfp->sfp_bus);
1671}
1672
1673static void sfp_sm_link_check_los(struct sfp *sfp)
1674{
1675 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1676 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1677 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1678 bool los = false;
1679
1680 /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1681 * are set, we assume that no LOS signal is available. If both are
1682 * set, we assume LOS is not implemented (and is meaningless.)
1683 */
1684 if (los_options == los_inverted)
1685 los = !(sfp->state & SFP_F_LOS);
1686 else if (los_options == los_normal)
1687 los = !!(sfp->state & SFP_F_LOS);
1688
1689 if (los)
1690 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1691 else
1692 sfp_sm_link_up(sfp);
1693}
1694
1695static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1696{
1697 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1698 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1699 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1700
1701 return (los_options == los_inverted && event == SFP_E_LOS_LOW) ||
1702 (los_options == los_normal && event == SFP_E_LOS_HIGH);
1703}
1704
1705static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1706{
1707 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1708 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1709 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1710
1711 return (los_options == los_inverted && event == SFP_E_LOS_HIGH) ||
1712 (los_options == los_normal && event == SFP_E_LOS_LOW);
1713}
1714
1715static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
1716{
1717 if (sfp->sm_fault_retries && !--sfp->sm_fault_retries) {
1718 dev_err(sfp->dev,
1719 "module persistently indicates fault, disabling\n");
1720 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1721 } else {
1722 if (warn)
1723 dev_err(sfp->dev, "module transmit fault indicated\n");
1724
1725 sfp_sm_next(sfp, next_state, T_FAULT_RECOVER);
1726 }
1727}
1728
1729static int sfp_sm_add_mdio_bus(struct sfp *sfp)
1730{
1731 if (sfp->mdio_protocol != MDIO_I2C_NONE)
1732 return sfp_i2c_mdiobus_create(sfp);
1733
1734 return 0;
1735}
1736
1737/* Probe a SFP for a PHY device if the module supports copper - the PHY
1738 * normally sits at I2C bus address 0x56, and may either be a clause 22
1739 * or clause 45 PHY.
1740 *
1741 * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with
1742 * negotiation enabled, but some may be in 1000base-X - which is for the
1743 * PHY driver to determine.
1744 *
1745 * Clause 45 copper SFP+ modules (10G) appear to switch their interface
1746 * mode according to the negotiated line speed.
1747 */
1748static int sfp_sm_probe_for_phy(struct sfp *sfp)
1749{
1750 int err = 0;
1751
1752 switch (sfp->mdio_protocol) {
1753 case MDIO_I2C_NONE:
1754 break;
1755
1756 case MDIO_I2C_MARVELL_C22:
1757 err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, false);
1758 break;
1759
1760 case MDIO_I2C_C45:
1761 err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, true);
1762 break;
1763
1764 case MDIO_I2C_ROLLBALL:
1765 err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR_ROLLBALL, true);
1766 break;
1767 }
1768
1769 return err;
1770}
1771
1772static int sfp_module_parse_power(struct sfp *sfp)
1773{
1774 u32 power_mW = 1000;
1775 bool supports_a2;
1776
1777 if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV10_2 &&
1778 sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1779 power_mW = 1500;
1780 /* Added in Rev 11.9, but there is no compliance code for this */
1781 if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV11_4 &&
1782 sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1783 power_mW = 2000;
1784
1785 /* Power level 1 modules (max. 1W) are always supported. */
1786 if (power_mW <= 1000) {
1787 sfp->module_power_mW = power_mW;
1788 return 0;
1789 }
1790
1791 supports_a2 = sfp->id.ext.sff8472_compliance !=
1792 SFP_SFF8472_COMPLIANCE_NONE ||
1793 sfp->id.ext.diagmon & SFP_DIAGMON_DDM;
1794
1795 if (power_mW > sfp->max_power_mW) {
1796 /* Module power specification exceeds the allowed maximum. */
1797 if (!supports_a2) {
1798 /* The module appears not to implement bus address
1799 * 0xa2, so assume that the module powers up in the
1800 * indicated mode.
1801 */
1802 dev_err(sfp->dev,
1803 "Host does not support %u.%uW modules\n",
1804 power_mW / 1000, (power_mW / 100) % 10);
1805 return -EINVAL;
1806 } else {
1807 dev_warn(sfp->dev,
1808 "Host does not support %u.%uW modules, module left in power mode 1\n",
1809 power_mW / 1000, (power_mW / 100) % 10);
1810 return 0;
1811 }
1812 }
1813
1814 if (!supports_a2) {
1815 /* The module power level is below the host maximum and the
1816 * module appears not to implement bus address 0xa2, so assume
1817 * that the module powers up in the indicated mode.
1818 */
1819 return 0;
1820 }
1821
1822 /* If the module requires a higher power mode, but also requires
1823 * an address change sequence, warn the user that the module may
1824 * not be functional.
1825 */
1826 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) {
1827 dev_warn(sfp->dev,
1828 "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n",
1829 power_mW / 1000, (power_mW / 100) % 10);
1830 return 0;
1831 }
1832
1833 sfp->module_power_mW = power_mW;
1834
1835 return 0;
1836}
1837
1838static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
1839{
1840 int err;
1841
1842 err = sfp_modify_u8(sfp, true, SFP_EXT_STATUS,
1843 SFP_EXT_STATUS_PWRLVL_SELECT,
1844 enable ? SFP_EXT_STATUS_PWRLVL_SELECT : 0);
1845 if (err != sizeof(u8)) {
1846 dev_err(sfp->dev, "failed to %sable high power: %pe\n",
1847 enable ? "en" : "dis", ERR_PTR(err));
1848 return -EAGAIN;
1849 }
1850
1851 if (enable)
1852 dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1853 sfp->module_power_mW / 1000,
1854 (sfp->module_power_mW / 100) % 10);
1855
1856 return 0;
1857}
1858
1859/* GPON modules based on Realtek RTL8672 and RTL9601C chips (e.g. V-SOL
1860 * V2801F, CarlitoxxPro CPGOS03-0490, Ubiquiti U-Fiber Instant, ...) do
1861 * not support multibyte reads from the EEPROM. Each multi-byte read
1862 * operation returns just one byte of EEPROM followed by zeros. There is
1863 * no way to identify which modules are using Realtek RTL8672 and RTL9601C
1864 * chips. Moreover every OEM of V-SOL V2801F module puts its own vendor
1865 * name and vendor id into EEPROM, so there is even no way to detect if
1866 * module is V-SOL V2801F. Therefore check for those zeros in the read
1867 * data and then based on check switch to reading EEPROM to one byte
1868 * at a time.
1869 */
1870static bool sfp_id_needs_byte_io(struct sfp *sfp, void *buf, size_t len)
1871{
1872 size_t i, block_size = sfp->i2c_block_size;
1873
1874 /* Already using byte IO */
1875 if (block_size == 1)
1876 return false;
1877
1878 for (i = 1; i < len; i += block_size) {
1879 if (memchr_inv(buf + i, '\0', min(block_size - 1, len - i)))
1880 return false;
1881 }
1882 return true;
1883}
1884
1885static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
1886{
1887 u8 check;
1888 int err;
1889
1890 if (id->base.phys_id != SFF8024_ID_SFF_8472 ||
1891 id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP ||
1892 id->base.connector != SFF8024_CONNECTOR_LC) {
1893 dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n");
1894 id->base.phys_id = SFF8024_ID_SFF_8472;
1895 id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP;
1896 id->base.connector = SFF8024_CONNECTOR_LC;
1897 err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3);
1898 if (err != 3) {
1899 dev_err(sfp->dev,
1900 "Failed to rewrite module EEPROM: %pe\n",
1901 ERR_PTR(err));
1902 return err;
1903 }
1904
1905 /* Cotsworks modules have been found to require a delay between write operations. */
1906 mdelay(50);
1907
1908 /* Update base structure checksum */
1909 check = sfp_check(&id->base, sizeof(id->base) - 1);
1910 err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1);
1911 if (err != 1) {
1912 dev_err(sfp->dev,
1913 "Failed to update base structure checksum in fiber module EEPROM: %pe\n",
1914 ERR_PTR(err));
1915 return err;
1916 }
1917 }
1918 return 0;
1919}
1920
1921static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
1922{
1923 /* SFP module inserted - read I2C data */
1924 struct sfp_eeprom_id id;
1925 bool cotsworks_sfbg;
1926 bool cotsworks;
1927 u8 check;
1928 int ret;
1929
1930 /* Some SFP modules and also some Linux I2C drivers do not like reads
1931 * longer than 16 bytes, so read the EEPROM in chunks of 16 bytes at
1932 * a time.
1933 */
1934 sfp->i2c_block_size = 16;
1935
1936 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
1937 if (ret < 0) {
1938 if (report)
1939 dev_err(sfp->dev, "failed to read EEPROM: %pe\n",
1940 ERR_PTR(ret));
1941 return -EAGAIN;
1942 }
1943
1944 if (ret != sizeof(id.base)) {
1945 dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret));
1946 return -EAGAIN;
1947 }
1948
1949 /* Some SFP modules (e.g. Nokia 3FE46541AA) lock up if read from
1950 * address 0x51 is just one byte at a time. Also SFF-8472 requires
1951 * that EEPROM supports atomic 16bit read operation for diagnostic
1952 * fields, so do not switch to one byte reading at a time unless it
1953 * is really required and we have no other option.
1954 */
1955 if (sfp_id_needs_byte_io(sfp, &id.base, sizeof(id.base))) {
1956 dev_info(sfp->dev,
1957 "Detected broken RTL8672/RTL9601C emulated EEPROM\n");
1958 dev_info(sfp->dev,
1959 "Switching to reading EEPROM to one byte at a time\n");
1960 sfp->i2c_block_size = 1;
1961
1962 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
1963 if (ret < 0) {
1964 if (report)
1965 dev_err(sfp->dev,
1966 "failed to read EEPROM: %pe\n",
1967 ERR_PTR(ret));
1968 return -EAGAIN;
1969 }
1970
1971 if (ret != sizeof(id.base)) {
1972 dev_err(sfp->dev, "EEPROM short read: %pe\n",
1973 ERR_PTR(ret));
1974 return -EAGAIN;
1975 }
1976 }
1977
1978 /* Cotsworks do not seem to update the checksums when they
1979 * do the final programming with the final module part number,
1980 * serial number and date code.
1981 */
1982 cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16);
1983 cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4);
1984
1985 /* Cotsworks SFF module EEPROM do not always have valid phys_id,
1986 * phys_ext_id, and connector bytes. Rewrite SFF EEPROM bytes if
1987 * Cotsworks PN matches and bytes are not correct.
1988 */
1989 if (cotsworks && cotsworks_sfbg) {
1990 ret = sfp_cotsworks_fixup_check(sfp, &id);
1991 if (ret < 0)
1992 return ret;
1993 }
1994
1995 /* Validate the checksum over the base structure */
1996 check = sfp_check(&id.base, sizeof(id.base) - 1);
1997 if (check != id.base.cc_base) {
1998 if (cotsworks) {
1999 dev_warn(sfp->dev,
2000 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
2001 check, id.base.cc_base);
2002 } else {
2003 dev_err(sfp->dev,
2004 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
2005 check, id.base.cc_base);
2006 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
2007 16, 1, &id, sizeof(id), true);
2008 return -EINVAL;
2009 }
2010 }
2011
2012 ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext));
2013 if (ret < 0) {
2014 if (report)
2015 dev_err(sfp->dev, "failed to read EEPROM: %pe\n",
2016 ERR_PTR(ret));
2017 return -EAGAIN;
2018 }
2019
2020 if (ret != sizeof(id.ext)) {
2021 dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret));
2022 return -EAGAIN;
2023 }
2024
2025 check = sfp_check(&id.ext, sizeof(id.ext) - 1);
2026 if (check != id.ext.cc_ext) {
2027 if (cotsworks) {
2028 dev_warn(sfp->dev,
2029 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
2030 check, id.ext.cc_ext);
2031 } else {
2032 dev_err(sfp->dev,
2033 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
2034 check, id.ext.cc_ext);
2035 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
2036 16, 1, &id, sizeof(id), true);
2037 memset(&id.ext, 0, sizeof(id.ext));
2038 }
2039 }
2040
2041 sfp->id = id;
2042
2043 dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
2044 (int)sizeof(id.base.vendor_name), id.base.vendor_name,
2045 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
2046 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
2047 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
2048 (int)sizeof(id.ext.datecode), id.ext.datecode);
2049
2050 /* Check whether we support this module */
2051 if (!sfp->type->module_supported(&id)) {
2052 dev_err(sfp->dev,
2053 "module is not supported - phys id 0x%02x 0x%02x\n",
2054 sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
2055 return -EINVAL;
2056 }
2057
2058 /* If the module requires address swap mode, warn about it */
2059 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
2060 dev_warn(sfp->dev,
2061 "module address swap to access page 0xA2 is not supported.\n");
2062
2063 /* Parse the module power requirement */
2064 ret = sfp_module_parse_power(sfp);
2065 if (ret < 0)
2066 return ret;
2067
2068 /* Initialise state bits to use from hardware */
2069 sfp->state_hw_mask = SFP_F_PRESENT;
2070 if (sfp->gpio[GPIO_TX_DISABLE])
2071 sfp->state_hw_mask |= SFP_F_TX_DISABLE;
2072 if (sfp->gpio[GPIO_TX_FAULT])
2073 sfp->state_hw_mask |= SFP_F_TX_FAULT;
2074 if (sfp->gpio[GPIO_LOS])
2075 sfp->state_hw_mask |= SFP_F_LOS;
2076
2077 sfp->module_t_start_up = T_START_UP;
2078 sfp->module_t_wait = T_WAIT;
2079
2080 sfp->tx_fault_ignore = false;
2081
2082 if (sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SFI ||
2083 sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SR ||
2084 sfp->id.base.extended_cc == SFF8024_ECC_5GBASE_T ||
2085 sfp->id.base.extended_cc == SFF8024_ECC_2_5GBASE_T)
2086 sfp->mdio_protocol = MDIO_I2C_C45;
2087 else if (sfp->id.base.e1000_base_t)
2088 sfp->mdio_protocol = MDIO_I2C_MARVELL_C22;
2089 else
2090 sfp->mdio_protocol = MDIO_I2C_NONE;
2091
2092 sfp->quirk = sfp_lookup_quirk(&id);
2093 if (sfp->quirk && sfp->quirk->fixup)
2094 sfp->quirk->fixup(sfp);
2095
2096 return 0;
2097}
2098
2099static void sfp_sm_mod_remove(struct sfp *sfp)
2100{
2101 if (sfp->sm_mod_state > SFP_MOD_WAITDEV)
2102 sfp_module_remove(sfp->sfp_bus);
2103
2104 sfp_hwmon_remove(sfp);
2105
2106 memset(&sfp->id, 0, sizeof(sfp->id));
2107 sfp->module_power_mW = 0;
2108
2109 dev_info(sfp->dev, "module removed\n");
2110}
2111
2112/* This state machine tracks the upstream's state */
2113static void sfp_sm_device(struct sfp *sfp, unsigned int event)
2114{
2115 switch (sfp->sm_dev_state) {
2116 default:
2117 if (event == SFP_E_DEV_ATTACH)
2118 sfp->sm_dev_state = SFP_DEV_DOWN;
2119 break;
2120
2121 case SFP_DEV_DOWN:
2122 if (event == SFP_E_DEV_DETACH)
2123 sfp->sm_dev_state = SFP_DEV_DETACHED;
2124 else if (event == SFP_E_DEV_UP)
2125 sfp->sm_dev_state = SFP_DEV_UP;
2126 break;
2127
2128 case SFP_DEV_UP:
2129 if (event == SFP_E_DEV_DETACH)
2130 sfp->sm_dev_state = SFP_DEV_DETACHED;
2131 else if (event == SFP_E_DEV_DOWN)
2132 sfp->sm_dev_state = SFP_DEV_DOWN;
2133 break;
2134 }
2135}
2136
2137/* This state machine tracks the insert/remove state of the module, probes
2138 * the on-board EEPROM, and sets up the power level.
2139 */
2140static void sfp_sm_module(struct sfp *sfp, unsigned int event)
2141{
2142 int err;
2143
2144 /* Handle remove event globally, it resets this state machine */
2145 if (event == SFP_E_REMOVE) {
2146 if (sfp->sm_mod_state > SFP_MOD_PROBE)
2147 sfp_sm_mod_remove(sfp);
2148 sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
2149 return;
2150 }
2151
2152 /* Handle device detach globally */
2153 if (sfp->sm_dev_state < SFP_DEV_DOWN &&
2154 sfp->sm_mod_state > SFP_MOD_WAITDEV) {
2155 if (sfp->module_power_mW > 1000 &&
2156 sfp->sm_mod_state > SFP_MOD_HPOWER)
2157 sfp_sm_mod_hpower(sfp, false);
2158 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
2159 return;
2160 }
2161
2162 switch (sfp->sm_mod_state) {
2163 default:
2164 if (event == SFP_E_INSERT) {
2165 sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL);
2166 sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT;
2167 sfp->sm_mod_tries = R_PROBE_RETRY_SLOW;
2168 }
2169 break;
2170
2171 case SFP_MOD_PROBE:
2172 /* Wait for T_PROBE_INIT to time out */
2173 if (event != SFP_E_TIMEOUT)
2174 break;
2175
2176 err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1);
2177 if (err == -EAGAIN) {
2178 if (sfp->sm_mod_tries_init &&
2179 --sfp->sm_mod_tries_init) {
2180 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
2181 break;
2182 } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) {
2183 if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1)
2184 dev_warn(sfp->dev,
2185 "please wait, module slow to respond\n");
2186 sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW);
2187 break;
2188 }
2189 }
2190 if (err < 0) {
2191 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2192 break;
2193 }
2194
2195 err = sfp_hwmon_insert(sfp);
2196 if (err)
2197 dev_warn(sfp->dev, "hwmon probe failed: %pe\n",
2198 ERR_PTR(err));
2199
2200 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
2201 fallthrough;
2202 case SFP_MOD_WAITDEV:
2203 /* Ensure that the device is attached before proceeding */
2204 if (sfp->sm_dev_state < SFP_DEV_DOWN)
2205 break;
2206
2207 /* Report the module insertion to the upstream device */
2208 err = sfp_module_insert(sfp->sfp_bus, &sfp->id,
2209 sfp->quirk);
2210 if (err < 0) {
2211 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2212 break;
2213 }
2214
2215 /* If this is a power level 1 module, we are done */
2216 if (sfp->module_power_mW <= 1000)
2217 goto insert;
2218
2219 sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0);
2220 fallthrough;
2221 case SFP_MOD_HPOWER:
2222 /* Enable high power mode */
2223 err = sfp_sm_mod_hpower(sfp, true);
2224 if (err < 0) {
2225 if (err != -EAGAIN) {
2226 sfp_module_remove(sfp->sfp_bus);
2227 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2228 } else {
2229 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
2230 }
2231 break;
2232 }
2233
2234 sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
2235 break;
2236
2237 case SFP_MOD_WAITPWR:
2238 /* Wait for T_HPOWER_LEVEL to time out */
2239 if (event != SFP_E_TIMEOUT)
2240 break;
2241
2242 insert:
2243 sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0);
2244 break;
2245
2246 case SFP_MOD_PRESENT:
2247 case SFP_MOD_ERROR:
2248 break;
2249 }
2250}
2251
2252static void sfp_sm_main(struct sfp *sfp, unsigned int event)
2253{
2254 unsigned long timeout;
2255 int ret;
2256
2257 /* Some events are global */
2258 if (sfp->sm_state != SFP_S_DOWN &&
2259 (sfp->sm_mod_state != SFP_MOD_PRESENT ||
2260 sfp->sm_dev_state != SFP_DEV_UP)) {
2261 if (sfp->sm_state == SFP_S_LINK_UP &&
2262 sfp->sm_dev_state == SFP_DEV_UP)
2263 sfp_sm_link_down(sfp);
2264 if (sfp->sm_state > SFP_S_INIT)
2265 sfp_module_stop(sfp->sfp_bus);
2266 if (sfp->mod_phy)
2267 sfp_sm_phy_detach(sfp);
2268 if (sfp->i2c_mii)
2269 sfp_i2c_mdiobus_destroy(sfp);
2270 sfp_module_tx_disable(sfp);
2271 sfp_soft_stop_poll(sfp);
2272 sfp_sm_next(sfp, SFP_S_DOWN, 0);
2273 return;
2274 }
2275
2276 /* The main state machine */
2277 switch (sfp->sm_state) {
2278 case SFP_S_DOWN:
2279 if (sfp->sm_mod_state != SFP_MOD_PRESENT ||
2280 sfp->sm_dev_state != SFP_DEV_UP)
2281 break;
2282
2283 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE))
2284 sfp_soft_start_poll(sfp);
2285
2286 sfp_module_tx_enable(sfp);
2287
2288 /* Initialise the fault clearance retries */
2289 sfp->sm_fault_retries = N_FAULT_INIT;
2290
2291 /* We need to check the TX_FAULT state, which is not defined
2292 * while TX_DISABLE is asserted. The earliest we want to do
2293 * anything (such as probe for a PHY) is 50ms (or more on
2294 * specific modules).
2295 */
2296 sfp_sm_next(sfp, SFP_S_WAIT, sfp->module_t_wait);
2297 break;
2298
2299 case SFP_S_WAIT:
2300 if (event != SFP_E_TIMEOUT)
2301 break;
2302
2303 if (sfp->state & SFP_F_TX_FAULT) {
2304 /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431)
2305 * from the TX_DISABLE deassertion for the module to
2306 * initialise, which is indicated by TX_FAULT
2307 * deasserting.
2308 */
2309 timeout = sfp->module_t_start_up;
2310 if (timeout > sfp->module_t_wait)
2311 timeout -= sfp->module_t_wait;
2312 else
2313 timeout = 1;
2314
2315 sfp_sm_next(sfp, SFP_S_INIT, timeout);
2316 } else {
2317 /* TX_FAULT is not asserted, assume the module has
2318 * finished initialising.
2319 */
2320 goto init_done;
2321 }
2322 break;
2323
2324 case SFP_S_INIT:
2325 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2326 /* TX_FAULT is still asserted after t_init
2327 * or t_start_up, so assume there is a fault.
2328 */
2329 sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
2330 sfp->sm_fault_retries == N_FAULT_INIT);
2331 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2332 init_done:
2333 /* Create mdiobus and start trying for PHY */
2334 ret = sfp_sm_add_mdio_bus(sfp);
2335 if (ret < 0) {
2336 sfp_sm_next(sfp, SFP_S_FAIL, 0);
2337 break;
2338 }
2339 sfp->sm_phy_retries = R_PHY_RETRY;
2340 goto phy_probe;
2341 }
2342 break;
2343
2344 case SFP_S_INIT_PHY:
2345 if (event != SFP_E_TIMEOUT)
2346 break;
2347 phy_probe:
2348 /* TX_FAULT deasserted or we timed out with TX_FAULT
2349 * clear. Probe for the PHY and check the LOS state.
2350 */
2351 ret = sfp_sm_probe_for_phy(sfp);
2352 if (ret == -ENODEV) {
2353 if (--sfp->sm_phy_retries) {
2354 sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY);
2355 break;
2356 } else {
2357 dev_info(sfp->dev, "no PHY detected\n");
2358 }
2359 } else if (ret) {
2360 sfp_sm_next(sfp, SFP_S_FAIL, 0);
2361 break;
2362 }
2363 if (sfp_module_start(sfp->sfp_bus)) {
2364 sfp_sm_next(sfp, SFP_S_FAIL, 0);
2365 break;
2366 }
2367 sfp_sm_link_check_los(sfp);
2368
2369 /* Reset the fault retry count */
2370 sfp->sm_fault_retries = N_FAULT;
2371 break;
2372
2373 case SFP_S_INIT_TX_FAULT:
2374 if (event == SFP_E_TIMEOUT) {
2375 sfp_module_tx_fault_reset(sfp);
2376 sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up);
2377 }
2378 break;
2379
2380 case SFP_S_WAIT_LOS:
2381 if (event == SFP_E_TX_FAULT)
2382 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2383 else if (sfp_los_event_inactive(sfp, event))
2384 sfp_sm_link_up(sfp);
2385 break;
2386
2387 case SFP_S_LINK_UP:
2388 if (event == SFP_E_TX_FAULT) {
2389 sfp_sm_link_down(sfp);
2390 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2391 } else if (sfp_los_event_active(sfp, event)) {
2392 sfp_sm_link_down(sfp);
2393 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
2394 }
2395 break;
2396
2397 case SFP_S_TX_FAULT:
2398 if (event == SFP_E_TIMEOUT) {
2399 sfp_module_tx_fault_reset(sfp);
2400 sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up);
2401 }
2402 break;
2403
2404 case SFP_S_REINIT:
2405 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2406 sfp_sm_fault(sfp, SFP_S_TX_FAULT, false);
2407 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2408 dev_info(sfp->dev, "module transmit fault recovered\n");
2409 sfp_sm_link_check_los(sfp);
2410 }
2411 break;
2412
2413 case SFP_S_TX_DISABLE:
2414 break;
2415 }
2416}
2417
2418static void sfp_sm_event(struct sfp *sfp, unsigned int event)
2419{
2420 mutex_lock(&sfp->sm_mutex);
2421
2422 dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
2423 mod_state_to_str(sfp->sm_mod_state),
2424 dev_state_to_str(sfp->sm_dev_state),
2425 sm_state_to_str(sfp->sm_state),
2426 event_to_str(event));
2427
2428 sfp_sm_device(sfp, event);
2429 sfp_sm_module(sfp, event);
2430 sfp_sm_main(sfp, event);
2431
2432 dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
2433 mod_state_to_str(sfp->sm_mod_state),
2434 dev_state_to_str(sfp->sm_dev_state),
2435 sm_state_to_str(sfp->sm_state));
2436
2437 mutex_unlock(&sfp->sm_mutex);
2438}
2439
2440static void sfp_attach(struct sfp *sfp)
2441{
2442 sfp_sm_event(sfp, SFP_E_DEV_ATTACH);
2443}
2444
2445static void sfp_detach(struct sfp *sfp)
2446{
2447 sfp_sm_event(sfp, SFP_E_DEV_DETACH);
2448}
2449
2450static void sfp_start(struct sfp *sfp)
2451{
2452 sfp_sm_event(sfp, SFP_E_DEV_UP);
2453}
2454
2455static void sfp_stop(struct sfp *sfp)
2456{
2457 sfp_sm_event(sfp, SFP_E_DEV_DOWN);
2458}
2459
2460static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
2461{
2462 /* locking... and check module is present */
2463
2464 if (sfp->id.ext.sff8472_compliance &&
2465 !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
2466 modinfo->type = ETH_MODULE_SFF_8472;
2467 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
2468 } else {
2469 modinfo->type = ETH_MODULE_SFF_8079;
2470 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
2471 }
2472 return 0;
2473}
2474
2475static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
2476 u8 *data)
2477{
2478 unsigned int first, last, len;
2479 int ret;
2480
2481 if (ee->len == 0)
2482 return -EINVAL;
2483
2484 first = ee->offset;
2485 last = ee->offset + ee->len;
2486 if (first < ETH_MODULE_SFF_8079_LEN) {
2487 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
2488 len -= first;
2489
2490 ret = sfp_read(sfp, false, first, data, len);
2491 if (ret < 0)
2492 return ret;
2493
2494 first += len;
2495 data += len;
2496 }
2497 if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
2498 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
2499 len -= first;
2500 first -= ETH_MODULE_SFF_8079_LEN;
2501
2502 ret = sfp_read(sfp, true, first, data, len);
2503 if (ret < 0)
2504 return ret;
2505 }
2506 return 0;
2507}
2508
2509static int sfp_module_eeprom_by_page(struct sfp *sfp,
2510 const struct ethtool_module_eeprom *page,
2511 struct netlink_ext_ack *extack)
2512{
2513 if (page->bank) {
2514 NL_SET_ERR_MSG(extack, "Banks not supported");
2515 return -EOPNOTSUPP;
2516 }
2517
2518 if (page->page) {
2519 NL_SET_ERR_MSG(extack, "Only page 0 supported");
2520 return -EOPNOTSUPP;
2521 }
2522
2523 if (page->i2c_address != 0x50 &&
2524 page->i2c_address != 0x51) {
2525 NL_SET_ERR_MSG(extack, "Only address 0x50 and 0x51 supported");
2526 return -EOPNOTSUPP;
2527 }
2528
2529 return sfp_read(sfp, page->i2c_address == 0x51, page->offset,
2530 page->data, page->length);
2531};
2532
2533static const struct sfp_socket_ops sfp_module_ops = {
2534 .attach = sfp_attach,
2535 .detach = sfp_detach,
2536 .start = sfp_start,
2537 .stop = sfp_stop,
2538 .module_info = sfp_module_info,
2539 .module_eeprom = sfp_module_eeprom,
2540 .module_eeprom_by_page = sfp_module_eeprom_by_page,
2541};
2542
2543static void sfp_timeout(struct work_struct *work)
2544{
2545 struct sfp *sfp = container_of(work, struct sfp, timeout.work);
2546
2547 rtnl_lock();
2548 sfp_sm_event(sfp, SFP_E_TIMEOUT);
2549 rtnl_unlock();
2550}
2551
2552static void sfp_check_state(struct sfp *sfp)
2553{
2554 unsigned int state, i, changed;
2555
2556 mutex_lock(&sfp->st_mutex);
2557 state = sfp_get_state(sfp);
2558 changed = state ^ sfp->state;
2559 if (sfp->tx_fault_ignore)
2560 changed &= SFP_F_PRESENT | SFP_F_LOS;
2561 else
2562 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
2563
2564 for (i = 0; i < GPIO_MAX; i++)
2565 if (changed & BIT(i))
2566 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
2567 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
2568
2569 state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
2570 sfp->state = state;
2571
2572 rtnl_lock();
2573 if (changed & SFP_F_PRESENT)
2574 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
2575 SFP_E_INSERT : SFP_E_REMOVE);
2576
2577 if (changed & SFP_F_TX_FAULT)
2578 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
2579 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
2580
2581 if (changed & SFP_F_LOS)
2582 sfp_sm_event(sfp, state & SFP_F_LOS ?
2583 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
2584 rtnl_unlock();
2585 mutex_unlock(&sfp->st_mutex);
2586}
2587
2588static irqreturn_t sfp_irq(int irq, void *data)
2589{
2590 struct sfp *sfp = data;
2591
2592 sfp_check_state(sfp);
2593
2594 return IRQ_HANDLED;
2595}
2596
2597static void sfp_poll(struct work_struct *work)
2598{
2599 struct sfp *sfp = container_of(work, struct sfp, poll.work);
2600
2601 sfp_check_state(sfp);
2602
2603 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) ||
2604 sfp->need_poll)
2605 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2606}
2607
2608static struct sfp *sfp_alloc(struct device *dev)
2609{
2610 struct sfp *sfp;
2611
2612 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
2613 if (!sfp)
2614 return ERR_PTR(-ENOMEM);
2615
2616 sfp->dev = dev;
2617
2618 mutex_init(&sfp->sm_mutex);
2619 mutex_init(&sfp->st_mutex);
2620 INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
2621 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
2622
2623 sfp_hwmon_init(sfp);
2624
2625 return sfp;
2626}
2627
2628static void sfp_cleanup(void *data)
2629{
2630 struct sfp *sfp = data;
2631
2632 sfp_hwmon_exit(sfp);
2633
2634 cancel_delayed_work_sync(&sfp->poll);
2635 cancel_delayed_work_sync(&sfp->timeout);
2636 if (sfp->i2c_mii) {
2637 mdiobus_unregister(sfp->i2c_mii);
2638 mdiobus_free(sfp->i2c_mii);
2639 }
2640 if (sfp->i2c)
2641 i2c_put_adapter(sfp->i2c);
2642 kfree(sfp);
2643}
2644
2645static int sfp_i2c_get(struct sfp *sfp)
2646{
2647 struct acpi_handle *acpi_handle;
2648 struct fwnode_handle *h;
2649 struct i2c_adapter *i2c;
2650 struct device_node *np;
2651 int err;
2652
2653 h = fwnode_find_reference(dev_fwnode(sfp->dev), "i2c-bus", 0);
2654 if (IS_ERR(h)) {
2655 dev_err(sfp->dev, "missing 'i2c-bus' property\n");
2656 return -ENODEV;
2657 }
2658
2659 if (is_acpi_device_node(h)) {
2660 acpi_handle = ACPI_HANDLE_FWNODE(h);
2661 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
2662 } else if ((np = to_of_node(h)) != NULL) {
2663 i2c = of_find_i2c_adapter_by_node(np);
2664 } else {
2665 err = -EINVAL;
2666 goto put;
2667 }
2668
2669 if (!i2c) {
2670 err = -EPROBE_DEFER;
2671 goto put;
2672 }
2673
2674 err = sfp_i2c_configure(sfp, i2c);
2675 if (err)
2676 i2c_put_adapter(i2c);
2677put:
2678 fwnode_handle_put(h);
2679 return err;
2680}
2681
2682static int sfp_probe(struct platform_device *pdev)
2683{
2684 const struct sff_data *sff;
2685 char *sfp_irq_name;
2686 struct sfp *sfp;
2687 int err, i;
2688
2689 sfp = sfp_alloc(&pdev->dev);
2690 if (IS_ERR(sfp))
2691 return PTR_ERR(sfp);
2692
2693 platform_set_drvdata(pdev, sfp);
2694
2695 err = devm_add_action_or_reset(sfp->dev, sfp_cleanup, sfp);
2696 if (err < 0)
2697 return err;
2698
2699 sff = sfp->type = &sfp_data;
2700
2701 if (pdev->dev.of_node) {
2702 const struct of_device_id *id;
2703
2704 id = of_match_node(sfp_of_match, pdev->dev.of_node);
2705 if (WARN_ON(!id))
2706 return -EINVAL;
2707
2708 sff = sfp->type = id->data;
2709 } else if (!has_acpi_companion(&pdev->dev)) {
2710 return -EINVAL;
2711 }
2712
2713 err = sfp_i2c_get(sfp);
2714 if (err)
2715 return err;
2716
2717 for (i = 0; i < GPIO_MAX; i++)
2718 if (sff->gpios & BIT(i)) {
2719 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
2720 gpio_of_names[i], gpio_flags[i]);
2721 if (IS_ERR(sfp->gpio[i]))
2722 return PTR_ERR(sfp->gpio[i]);
2723 }
2724
2725 sfp->state_hw_mask = SFP_F_PRESENT;
2726
2727 sfp->get_state = sfp_gpio_get_state;
2728 sfp->set_state = sfp_gpio_set_state;
2729
2730 /* Modules that have no detect signal are always present */
2731 if (!(sfp->gpio[GPIO_MODDEF0]))
2732 sfp->get_state = sff_gpio_get_state;
2733
2734 device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
2735 &sfp->max_power_mW);
2736 if (sfp->max_power_mW < 1000) {
2737 if (sfp->max_power_mW)
2738 dev_warn(sfp->dev,
2739 "Firmware bug: host maximum power should be at least 1W\n");
2740 sfp->max_power_mW = 1000;
2741 }
2742
2743 dev_info(sfp->dev, "Host maximum power %u.%uW\n",
2744 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
2745
2746 /* Get the initial state, and always signal TX disable,
2747 * since the network interface will not be up.
2748 */
2749 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
2750
2751 if (sfp->gpio[GPIO_RATE_SELECT] &&
2752 gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
2753 sfp->state |= SFP_F_RATE_SELECT;
2754 sfp_set_state(sfp, sfp->state);
2755 sfp_module_tx_disable(sfp);
2756 if (sfp->state & SFP_F_PRESENT) {
2757 rtnl_lock();
2758 sfp_sm_event(sfp, SFP_E_INSERT);
2759 rtnl_unlock();
2760 }
2761
2762 for (i = 0; i < GPIO_MAX; i++) {
2763 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
2764 continue;
2765
2766 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
2767 if (sfp->gpio_irq[i] < 0) {
2768 sfp->gpio_irq[i] = 0;
2769 sfp->need_poll = true;
2770 continue;
2771 }
2772
2773 sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL,
2774 "%s-%s", dev_name(sfp->dev),
2775 gpio_of_names[i]);
2776
2777 if (!sfp_irq_name)
2778 return -ENOMEM;
2779
2780 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
2781 NULL, sfp_irq,
2782 IRQF_ONESHOT |
2783 IRQF_TRIGGER_RISING |
2784 IRQF_TRIGGER_FALLING,
2785 sfp_irq_name, sfp);
2786 if (err) {
2787 sfp->gpio_irq[i] = 0;
2788 sfp->need_poll = true;
2789 }
2790 }
2791
2792 if (sfp->need_poll)
2793 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2794
2795 /* We could have an issue in cases no Tx disable pin is available or
2796 * wired as modules using a laser as their light source will continue to
2797 * be active when the fiber is removed. This could be a safety issue and
2798 * we should at least warn the user about that.
2799 */
2800 if (!sfp->gpio[GPIO_TX_DISABLE])
2801 dev_warn(sfp->dev,
2802 "No tx_disable pin: SFP modules will always be emitting.\n");
2803
2804 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
2805 if (!sfp->sfp_bus)
2806 return -ENOMEM;
2807
2808 sfp_debugfs_init(sfp);
2809
2810 return 0;
2811}
2812
2813static int sfp_remove(struct platform_device *pdev)
2814{
2815 struct sfp *sfp = platform_get_drvdata(pdev);
2816
2817 sfp_debugfs_exit(sfp);
2818 sfp_unregister_socket(sfp->sfp_bus);
2819
2820 rtnl_lock();
2821 sfp_sm_event(sfp, SFP_E_REMOVE);
2822 rtnl_unlock();
2823
2824 return 0;
2825}
2826
2827static void sfp_shutdown(struct platform_device *pdev)
2828{
2829 struct sfp *sfp = platform_get_drvdata(pdev);
2830 int i;
2831
2832 for (i = 0; i < GPIO_MAX; i++) {
2833 if (!sfp->gpio_irq[i])
2834 continue;
2835
2836 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp);
2837 }
2838
2839 cancel_delayed_work_sync(&sfp->poll);
2840 cancel_delayed_work_sync(&sfp->timeout);
2841}
2842
2843static struct platform_driver sfp_driver = {
2844 .probe = sfp_probe,
2845 .remove = sfp_remove,
2846 .shutdown = sfp_shutdown,
2847 .driver = {
2848 .name = "sfp",
2849 .of_match_table = sfp_of_match,
2850 },
2851};
2852
2853static int sfp_init(void)
2854{
2855 poll_jiffies = msecs_to_jiffies(100);
2856
2857 return platform_driver_register(&sfp_driver);
2858}
2859module_init(sfp_init);
2860
2861static void sfp_exit(void)
2862{
2863 platform_driver_unregister(&sfp_driver);
2864}
2865module_exit(sfp_exit);
2866
2867MODULE_ALIAS("platform:sfp");
2868MODULE_AUTHOR("Russell King");
2869MODULE_LICENSE("GPL v2");