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>
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>
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>
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),
75 static 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",
85 static const char *mod_state_to_str(unsigned short mod_state)
87 if (mod_state >= ARRAY_SIZE(mod_state_strings))
88 return "Unknown module state";
89 return mod_state_strings[mod_state];
92 static const char * const dev_state_strings[] = {
93 [SFP_DEV_DETACHED] = "detached",
94 [SFP_DEV_DOWN] = "down",
98 static const char *dev_state_to_str(unsigned short dev_state)
100 if (dev_state >= ARRAY_SIZE(dev_state_strings))
101 return "Unknown device state";
102 return dev_state_strings[dev_state];
105 static 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",
119 static const char *event_to_str(unsigned short event)
121 if (event >= ARRAY_SIZE(event_strings))
122 return "Unknown event";
123 return event_strings[event];
126 static 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",
140 static const char *sm_state_to_str(unsigned short sm_state)
142 if (sm_state >= ARRAY_SIZE(sm_state_strings))
143 return "Unknown state";
144 return sm_state_strings[sm_state];
147 static const char *gpio_of_names[] = {
155 static const enum gpiod_flags gpio_flags[] = {
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.
168 #define T_WAIT msecs_to_jiffies(50)
169 #define T_START_UP msecs_to_jiffies(300)
170 #define T_START_UP_BAD_GPON msecs_to_jiffies(60000)
172 /* t_reset is the time required to assert the TX_DISABLE signal to reset
173 * an indicated TX_FAULT.
175 #define T_RESET_US 10
176 #define T_FAULT_RECOVER msecs_to_jiffies(1000)
178 /* N_FAULT_INIT is the number of recovery attempts at module initialisation
179 * time. If the TX_FAULT signal is not deasserted after this number of
180 * attempts at clearing it, we decide that the module is faulty.
181 * N_FAULT is the same but after the module has initialised.
183 #define N_FAULT_INIT 5
186 /* T_PHY_RETRY is the time interval between attempts to probe the PHY.
187 * R_PHY_RETRY is the number of attempts.
189 #define T_PHY_RETRY msecs_to_jiffies(50)
190 #define R_PHY_RETRY 12
192 /* SFP module presence detection is poor: the three MOD DEF signals are
193 * the same length on the PCB, which means it's possible for MOD DEF 0 to
194 * connect before the I2C bus on MOD DEF 1/2.
196 * The SFF-8472 specifies t_serial ("Time from power on until module is
197 * ready for data transmission over the two wire serial bus.") as 300ms.
199 #define T_SERIAL msecs_to_jiffies(300)
200 #define T_HPOWER_LEVEL msecs_to_jiffies(300)
201 #define T_PROBE_RETRY_INIT msecs_to_jiffies(100)
202 #define R_PROBE_RETRY_INIT 10
203 #define T_PROBE_RETRY_SLOW msecs_to_jiffies(5000)
204 #define R_PROBE_RETRY_SLOW 12
206 /* SFP modules appear to always have their PHY configured for bus address
207 * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
209 #define SFP_PHY_ADDR 22
213 bool (*module_supported)(const struct sfp_eeprom_id *id);
218 struct i2c_adapter *i2c;
219 struct mii_bus *i2c_mii;
220 struct sfp_bus *sfp_bus;
221 struct phy_device *mod_phy;
222 const struct sff_data *type;
223 size_t i2c_block_size;
226 unsigned int (*get_state)(struct sfp *);
227 void (*set_state)(struct sfp *, unsigned int);
228 int (*read)(struct sfp *, bool, u8, void *, size_t);
229 int (*write)(struct sfp *, bool, u8, void *, size_t);
231 struct gpio_desc *gpio[GPIO_MAX];
232 int gpio_irq[GPIO_MAX];
236 struct mutex st_mutex; /* Protects state */
237 unsigned int state_soft_mask;
239 struct delayed_work poll;
240 struct delayed_work timeout;
241 struct mutex sm_mutex; /* Protects state machine */
242 unsigned char sm_mod_state;
243 unsigned char sm_mod_tries_init;
244 unsigned char sm_mod_tries;
245 unsigned char sm_dev_state;
246 unsigned short sm_state;
247 unsigned char sm_fault_retries;
248 unsigned char sm_phy_retries;
250 struct sfp_eeprom_id id;
251 unsigned int module_power_mW;
252 unsigned int module_t_start_up;
253 bool tx_fault_ignore;
255 #if IS_ENABLED(CONFIG_HWMON)
256 struct sfp_diag diag;
257 struct delayed_work hwmon_probe;
258 unsigned int hwmon_tries;
259 struct device *hwmon_dev;
263 #if IS_ENABLED(CONFIG_DEBUG_FS)
264 struct dentry *debugfs_dir;
268 static bool sff_module_supported(const struct sfp_eeprom_id *id)
270 return id->base.phys_id == SFF8024_ID_SFF_8472 &&
271 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
274 static const struct sff_data sff_data = {
275 .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
276 .module_supported = sff_module_supported,
279 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
281 if (id->base.phys_id == SFF8024_ID_SFP &&
282 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP)
285 /* SFP GPON module Ubiquiti U-Fiber Instant has in its EEPROM stored
286 * phys id SFF instead of SFP. Therefore mark this module explicitly
287 * as supported based on vendor name and pn match.
289 if (id->base.phys_id == SFF8024_ID_SFF_8472 &&
290 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP &&
291 !memcmp(id->base.vendor_name, "UBNT ", 16) &&
292 !memcmp(id->base.vendor_pn, "UF-INSTANT ", 16))
298 static const struct sff_data sfp_data = {
299 .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
300 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
301 .module_supported = sfp_module_supported,
304 static const struct of_device_id sfp_of_match[] = {
305 { .compatible = "sff,sff", .data = &sff_data, },
306 { .compatible = "sff,sfp", .data = &sfp_data, },
309 MODULE_DEVICE_TABLE(of, sfp_of_match);
311 static unsigned long poll_jiffies;
313 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
315 unsigned int i, state, v;
317 for (i = state = 0; i < GPIO_MAX; i++) {
318 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
321 v = gpiod_get_value_cansleep(sfp->gpio[i]);
329 static unsigned int sff_gpio_get_state(struct sfp *sfp)
331 return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
334 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
336 if (state & SFP_F_PRESENT) {
337 /* If the module is present, drive the signals */
338 if (sfp->gpio[GPIO_TX_DISABLE])
339 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
340 state & SFP_F_TX_DISABLE);
341 if (state & SFP_F_RATE_SELECT)
342 gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
343 state & SFP_F_RATE_SELECT);
345 /* Otherwise, let them float to the pull-ups */
346 if (sfp->gpio[GPIO_TX_DISABLE])
347 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
348 if (state & SFP_F_RATE_SELECT)
349 gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
353 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
356 struct i2c_msg msgs[2];
357 u8 bus_addr = a2 ? 0x51 : 0x50;
358 size_t block_size = sfp->i2c_block_size;
362 msgs[0].addr = bus_addr;
365 msgs[0].buf = &dev_addr;
366 msgs[1].addr = bus_addr;
367 msgs[1].flags = I2C_M_RD;
373 if (this_len > block_size)
374 this_len = block_size;
376 msgs[1].len = this_len;
378 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
382 if (ret != ARRAY_SIZE(msgs))
385 msgs[1].buf += this_len;
386 dev_addr += this_len;
390 return msgs[1].buf - (u8 *)buf;
393 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
396 struct i2c_msg msgs[1];
397 u8 bus_addr = a2 ? 0x51 : 0x50;
400 msgs[0].addr = bus_addr;
402 msgs[0].len = 1 + len;
403 msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
407 msgs[0].buf[0] = dev_addr;
408 memcpy(&msgs[0].buf[1], buf, len);
410 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
417 return ret == ARRAY_SIZE(msgs) ? len : 0;
420 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
422 struct mii_bus *i2c_mii;
425 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
429 sfp->read = sfp_i2c_read;
430 sfp->write = sfp_i2c_write;
432 i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
434 return PTR_ERR(i2c_mii);
436 i2c_mii->name = "SFP I2C Bus";
437 i2c_mii->phy_mask = ~0;
439 ret = mdiobus_register(i2c_mii);
441 mdiobus_free(i2c_mii);
445 sfp->i2c_mii = i2c_mii;
451 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
453 return sfp->read(sfp, a2, addr, buf, len);
456 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
458 return sfp->write(sfp, a2, addr, buf, len);
461 static unsigned int sfp_soft_get_state(struct sfp *sfp)
463 unsigned int state = 0;
467 ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status));
468 if (ret == sizeof(status)) {
469 if (status & SFP_STATUS_RX_LOS)
471 if (status & SFP_STATUS_TX_FAULT)
472 state |= SFP_F_TX_FAULT;
474 dev_err_ratelimited(sfp->dev,
475 "failed to read SFP soft status: %d\n",
477 /* Preserve the current state */
481 return state & sfp->state_soft_mask;
484 static void sfp_soft_set_state(struct sfp *sfp, unsigned int state)
488 if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) ==
490 if (state & SFP_F_TX_DISABLE)
491 status |= SFP_STATUS_TX_DISABLE_FORCE;
493 status &= ~SFP_STATUS_TX_DISABLE_FORCE;
495 sfp_write(sfp, true, SFP_STATUS, &status, sizeof(status));
499 static void sfp_soft_start_poll(struct sfp *sfp)
501 const struct sfp_eeprom_id *id = &sfp->id;
503 sfp->state_soft_mask = 0;
504 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE &&
505 !sfp->gpio[GPIO_TX_DISABLE])
506 sfp->state_soft_mask |= SFP_F_TX_DISABLE;
507 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT &&
508 !sfp->gpio[GPIO_TX_FAULT])
509 sfp->state_soft_mask |= SFP_F_TX_FAULT;
510 if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS &&
511 !sfp->gpio[GPIO_LOS])
512 sfp->state_soft_mask |= SFP_F_LOS;
514 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
516 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
519 static void sfp_soft_stop_poll(struct sfp *sfp)
521 sfp->state_soft_mask = 0;
524 static unsigned int sfp_get_state(struct sfp *sfp)
526 unsigned int state = sfp->get_state(sfp);
528 if (state & SFP_F_PRESENT &&
529 sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT))
530 state |= sfp_soft_get_state(sfp);
535 static void sfp_set_state(struct sfp *sfp, unsigned int state)
537 sfp->set_state(sfp, state);
539 if (state & SFP_F_PRESENT &&
540 sfp->state_soft_mask & SFP_F_TX_DISABLE)
541 sfp_soft_set_state(sfp, state);
544 static unsigned int sfp_check(void *buf, size_t len)
548 for (p = buf, check = 0; len; p++, len--)
555 #if IS_ENABLED(CONFIG_HWMON)
556 static umode_t sfp_hwmon_is_visible(const void *data,
557 enum hwmon_sensor_types type,
558 u32 attr, int channel)
560 const struct sfp *sfp = data;
565 case hwmon_temp_min_alarm:
566 case hwmon_temp_max_alarm:
567 case hwmon_temp_lcrit_alarm:
568 case hwmon_temp_crit_alarm:
571 case hwmon_temp_lcrit:
572 case hwmon_temp_crit:
573 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
576 case hwmon_temp_input:
577 case hwmon_temp_label:
584 case hwmon_in_min_alarm:
585 case hwmon_in_max_alarm:
586 case hwmon_in_lcrit_alarm:
587 case hwmon_in_crit_alarm:
592 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
603 case hwmon_curr_min_alarm:
604 case hwmon_curr_max_alarm:
605 case hwmon_curr_lcrit_alarm:
606 case hwmon_curr_crit_alarm:
609 case hwmon_curr_lcrit:
610 case hwmon_curr_crit:
611 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
614 case hwmon_curr_input:
615 case hwmon_curr_label:
621 /* External calibration of receive power requires
622 * floating point arithmetic. Doing that in the kernel
623 * is not easy, so just skip it. If the module does
624 * not require external calibration, we can however
625 * show receiver power, since FP is then not needed.
627 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
631 case hwmon_power_min_alarm:
632 case hwmon_power_max_alarm:
633 case hwmon_power_lcrit_alarm:
634 case hwmon_power_crit_alarm:
635 case hwmon_power_min:
636 case hwmon_power_max:
637 case hwmon_power_lcrit:
638 case hwmon_power_crit:
639 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
642 case hwmon_power_input:
643 case hwmon_power_label:
653 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
658 err = sfp_read(sfp, true, reg, &val, sizeof(val));
662 *value = be16_to_cpu(val);
667 static void sfp_hwmon_to_rx_power(long *value)
669 *value = DIV_ROUND_CLOSEST(*value, 10);
672 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
675 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
676 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
679 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
681 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
682 be16_to_cpu(sfp->diag.cal_t_offset), value);
684 if (*value >= 0x8000)
687 *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
690 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
692 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
693 be16_to_cpu(sfp->diag.cal_v_offset), value);
695 *value = DIV_ROUND_CLOSEST(*value, 10);
698 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
700 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
701 be16_to_cpu(sfp->diag.cal_txi_offset), value);
703 *value = DIV_ROUND_CLOSEST(*value, 500);
706 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
708 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
709 be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
711 *value = DIV_ROUND_CLOSEST(*value, 10);
714 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
718 err = sfp_hwmon_read_sensor(sfp, reg, value);
722 sfp_hwmon_calibrate_temp(sfp, value);
727 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
731 err = sfp_hwmon_read_sensor(sfp, reg, value);
735 sfp_hwmon_calibrate_vcc(sfp, value);
740 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
744 err = sfp_hwmon_read_sensor(sfp, reg, value);
748 sfp_hwmon_calibrate_bias(sfp, value);
753 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
757 err = sfp_hwmon_read_sensor(sfp, reg, value);
761 sfp_hwmon_calibrate_tx_power(sfp, value);
766 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
770 err = sfp_hwmon_read_sensor(sfp, reg, value);
774 sfp_hwmon_to_rx_power(value);
779 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
785 case hwmon_temp_input:
786 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
788 case hwmon_temp_lcrit:
789 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
790 sfp_hwmon_calibrate_temp(sfp, value);
794 *value = be16_to_cpu(sfp->diag.temp_low_warn);
795 sfp_hwmon_calibrate_temp(sfp, value);
798 *value = be16_to_cpu(sfp->diag.temp_high_warn);
799 sfp_hwmon_calibrate_temp(sfp, value);
802 case hwmon_temp_crit:
803 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
804 sfp_hwmon_calibrate_temp(sfp, value);
807 case hwmon_temp_lcrit_alarm:
808 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
812 *value = !!(status & SFP_ALARM0_TEMP_LOW);
815 case hwmon_temp_min_alarm:
816 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
820 *value = !!(status & SFP_WARN0_TEMP_LOW);
823 case hwmon_temp_max_alarm:
824 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
828 *value = !!(status & SFP_WARN0_TEMP_HIGH);
831 case hwmon_temp_crit_alarm:
832 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
836 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
845 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
852 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
855 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
856 sfp_hwmon_calibrate_vcc(sfp, value);
860 *value = be16_to_cpu(sfp->diag.volt_low_warn);
861 sfp_hwmon_calibrate_vcc(sfp, value);
865 *value = be16_to_cpu(sfp->diag.volt_high_warn);
866 sfp_hwmon_calibrate_vcc(sfp, value);
870 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
871 sfp_hwmon_calibrate_vcc(sfp, value);
874 case hwmon_in_lcrit_alarm:
875 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
879 *value = !!(status & SFP_ALARM0_VCC_LOW);
882 case hwmon_in_min_alarm:
883 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
887 *value = !!(status & SFP_WARN0_VCC_LOW);
890 case hwmon_in_max_alarm:
891 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
895 *value = !!(status & SFP_WARN0_VCC_HIGH);
898 case hwmon_in_crit_alarm:
899 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
903 *value = !!(status & SFP_ALARM0_VCC_HIGH);
912 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
918 case hwmon_curr_input:
919 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
921 case hwmon_curr_lcrit:
922 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
923 sfp_hwmon_calibrate_bias(sfp, value);
927 *value = be16_to_cpu(sfp->diag.bias_low_warn);
928 sfp_hwmon_calibrate_bias(sfp, value);
932 *value = be16_to_cpu(sfp->diag.bias_high_warn);
933 sfp_hwmon_calibrate_bias(sfp, value);
936 case hwmon_curr_crit:
937 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
938 sfp_hwmon_calibrate_bias(sfp, value);
941 case hwmon_curr_lcrit_alarm:
942 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
946 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
949 case hwmon_curr_min_alarm:
950 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
954 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
957 case hwmon_curr_max_alarm:
958 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
962 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
965 case hwmon_curr_crit_alarm:
966 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
970 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
979 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
985 case hwmon_power_input:
986 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
988 case hwmon_power_lcrit:
989 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
990 sfp_hwmon_calibrate_tx_power(sfp, value);
993 case hwmon_power_min:
994 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
995 sfp_hwmon_calibrate_tx_power(sfp, value);
998 case hwmon_power_max:
999 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
1000 sfp_hwmon_calibrate_tx_power(sfp, value);
1003 case hwmon_power_crit:
1004 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
1005 sfp_hwmon_calibrate_tx_power(sfp, value);
1008 case hwmon_power_lcrit_alarm:
1009 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1013 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
1016 case hwmon_power_min_alarm:
1017 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1021 *value = !!(status & SFP_WARN0_TXPWR_LOW);
1024 case hwmon_power_max_alarm:
1025 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1029 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
1032 case hwmon_power_crit_alarm:
1033 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1037 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
1046 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
1052 case hwmon_power_input:
1053 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
1055 case hwmon_power_lcrit:
1056 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
1057 sfp_hwmon_to_rx_power(value);
1060 case hwmon_power_min:
1061 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
1062 sfp_hwmon_to_rx_power(value);
1065 case hwmon_power_max:
1066 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
1067 sfp_hwmon_to_rx_power(value);
1070 case hwmon_power_crit:
1071 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
1072 sfp_hwmon_to_rx_power(value);
1075 case hwmon_power_lcrit_alarm:
1076 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1080 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
1083 case hwmon_power_min_alarm:
1084 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1088 *value = !!(status & SFP_WARN1_RXPWR_LOW);
1091 case hwmon_power_max_alarm:
1092 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1096 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
1099 case hwmon_power_crit_alarm:
1100 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1104 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
1113 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
1114 u32 attr, int channel, long *value)
1116 struct sfp *sfp = dev_get_drvdata(dev);
1120 return sfp_hwmon_temp(sfp, attr, value);
1122 return sfp_hwmon_vcc(sfp, attr, value);
1124 return sfp_hwmon_bias(sfp, attr, value);
1128 return sfp_hwmon_tx_power(sfp, attr, value);
1130 return sfp_hwmon_rx_power(sfp, attr, value);
1139 static const char *const sfp_hwmon_power_labels[] = {
1144 static int sfp_hwmon_read_string(struct device *dev,
1145 enum hwmon_sensor_types type,
1146 u32 attr, int channel, const char **str)
1151 case hwmon_curr_label:
1160 case hwmon_temp_label:
1161 *str = "temperature";
1169 case hwmon_in_label:
1178 case hwmon_power_label:
1179 *str = sfp_hwmon_power_labels[channel];
1192 static const struct hwmon_ops sfp_hwmon_ops = {
1193 .is_visible = sfp_hwmon_is_visible,
1194 .read = sfp_hwmon_read,
1195 .read_string = sfp_hwmon_read_string,
1198 static u32 sfp_hwmon_chip_config[] = {
1199 HWMON_C_REGISTER_TZ,
1203 static const struct hwmon_channel_info sfp_hwmon_chip = {
1205 .config = sfp_hwmon_chip_config,
1208 static u32 sfp_hwmon_temp_config[] = {
1210 HWMON_T_MAX | HWMON_T_MIN |
1211 HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
1212 HWMON_T_CRIT | HWMON_T_LCRIT |
1213 HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM |
1218 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
1220 .config = sfp_hwmon_temp_config,
1223 static u32 sfp_hwmon_vcc_config[] = {
1225 HWMON_I_MAX | HWMON_I_MIN |
1226 HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1227 HWMON_I_CRIT | HWMON_I_LCRIT |
1228 HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM |
1233 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1235 .config = sfp_hwmon_vcc_config,
1238 static u32 sfp_hwmon_bias_config[] = {
1240 HWMON_C_MAX | HWMON_C_MIN |
1241 HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1242 HWMON_C_CRIT | HWMON_C_LCRIT |
1243 HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM |
1248 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1250 .config = sfp_hwmon_bias_config,
1253 static u32 sfp_hwmon_power_config[] = {
1254 /* Transmit power */
1256 HWMON_P_MAX | HWMON_P_MIN |
1257 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1258 HWMON_P_CRIT | HWMON_P_LCRIT |
1259 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1263 HWMON_P_MAX | HWMON_P_MIN |
1264 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1265 HWMON_P_CRIT | HWMON_P_LCRIT |
1266 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1271 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1272 .type = hwmon_power,
1273 .config = sfp_hwmon_power_config,
1276 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1278 &sfp_hwmon_vcc_channel_info,
1279 &sfp_hwmon_temp_channel_info,
1280 &sfp_hwmon_bias_channel_info,
1281 &sfp_hwmon_power_channel_info,
1285 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1286 .ops = &sfp_hwmon_ops,
1287 .info = sfp_hwmon_info,
1290 static void sfp_hwmon_probe(struct work_struct *work)
1292 struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work);
1295 /* hwmon interface needs to access 16bit registers in atomic way to
1296 * guarantee coherency of the diagnostic monitoring data. If it is not
1297 * possible to guarantee coherency because EEPROM is broken in such way
1298 * that does not support atomic 16bit read operation then we have to
1299 * skip registration of hwmon device.
1301 if (sfp->i2c_block_size < 2) {
1303 "skipping hwmon device registration due to broken EEPROM\n");
1305 "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n");
1309 err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1311 if (sfp->hwmon_tries--) {
1312 mod_delayed_work(system_wq, &sfp->hwmon_probe,
1313 T_PROBE_RETRY_SLOW);
1315 dev_warn(sfp->dev, "hwmon probe failed: %d\n", err);
1320 sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1321 if (!sfp->hwmon_name) {
1322 dev_err(sfp->dev, "out of memory for hwmon name\n");
1326 for (i = 0; sfp->hwmon_name[i]; i++)
1327 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1328 sfp->hwmon_name[i] = '_';
1330 sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1331 sfp->hwmon_name, sfp,
1332 &sfp_hwmon_chip_info,
1334 if (IS_ERR(sfp->hwmon_dev))
1335 dev_err(sfp->dev, "failed to register hwmon device: %ld\n",
1336 PTR_ERR(sfp->hwmon_dev));
1339 static int sfp_hwmon_insert(struct sfp *sfp)
1341 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1344 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1347 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1348 /* This driver in general does not support address
1353 mod_delayed_work(system_wq, &sfp->hwmon_probe, 1);
1354 sfp->hwmon_tries = R_PROBE_RETRY_SLOW;
1359 static void sfp_hwmon_remove(struct sfp *sfp)
1361 cancel_delayed_work_sync(&sfp->hwmon_probe);
1362 if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1363 hwmon_device_unregister(sfp->hwmon_dev);
1364 sfp->hwmon_dev = NULL;
1365 kfree(sfp->hwmon_name);
1369 static int sfp_hwmon_init(struct sfp *sfp)
1371 INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe);
1376 static void sfp_hwmon_exit(struct sfp *sfp)
1378 cancel_delayed_work_sync(&sfp->hwmon_probe);
1381 static int sfp_hwmon_insert(struct sfp *sfp)
1386 static void sfp_hwmon_remove(struct sfp *sfp)
1390 static int sfp_hwmon_init(struct sfp *sfp)
1395 static void sfp_hwmon_exit(struct sfp *sfp)
1401 static void sfp_module_tx_disable(struct sfp *sfp)
1403 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1404 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1405 sfp->state |= SFP_F_TX_DISABLE;
1406 sfp_set_state(sfp, sfp->state);
1409 static void sfp_module_tx_enable(struct sfp *sfp)
1411 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1412 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1413 sfp->state &= ~SFP_F_TX_DISABLE;
1414 sfp_set_state(sfp, sfp->state);
1417 #if IS_ENABLED(CONFIG_DEBUG_FS)
1418 static int sfp_debug_state_show(struct seq_file *s, void *data)
1420 struct sfp *sfp = s->private;
1422 seq_printf(s, "Module state: %s\n",
1423 mod_state_to_str(sfp->sm_mod_state));
1424 seq_printf(s, "Module probe attempts: %d %d\n",
1425 R_PROBE_RETRY_INIT - sfp->sm_mod_tries_init,
1426 R_PROBE_RETRY_SLOW - sfp->sm_mod_tries);
1427 seq_printf(s, "Device state: %s\n",
1428 dev_state_to_str(sfp->sm_dev_state));
1429 seq_printf(s, "Main state: %s\n",
1430 sm_state_to_str(sfp->sm_state));
1431 seq_printf(s, "Fault recovery remaining retries: %d\n",
1432 sfp->sm_fault_retries);
1433 seq_printf(s, "PHY probe remaining retries: %d\n",
1434 sfp->sm_phy_retries);
1435 seq_printf(s, "moddef0: %d\n", !!(sfp->state & SFP_F_PRESENT));
1436 seq_printf(s, "rx_los: %d\n", !!(sfp->state & SFP_F_LOS));
1437 seq_printf(s, "tx_fault: %d\n", !!(sfp->state & SFP_F_TX_FAULT));
1438 seq_printf(s, "tx_disable: %d\n", !!(sfp->state & SFP_F_TX_DISABLE));
1441 DEFINE_SHOW_ATTRIBUTE(sfp_debug_state);
1443 static void sfp_debugfs_init(struct sfp *sfp)
1445 sfp->debugfs_dir = debugfs_create_dir(dev_name(sfp->dev), NULL);
1447 debugfs_create_file("state", 0600, sfp->debugfs_dir, sfp,
1448 &sfp_debug_state_fops);
1451 static void sfp_debugfs_exit(struct sfp *sfp)
1453 debugfs_remove_recursive(sfp->debugfs_dir);
1456 static void sfp_debugfs_init(struct sfp *sfp)
1460 static void sfp_debugfs_exit(struct sfp *sfp)
1465 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1467 unsigned int state = sfp->state;
1469 if (state & SFP_F_TX_DISABLE)
1472 sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1476 sfp_set_state(sfp, state);
1479 /* SFP state machine */
1480 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1483 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1486 cancel_delayed_work(&sfp->timeout);
1489 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1490 unsigned int timeout)
1492 sfp->sm_state = state;
1493 sfp_sm_set_timer(sfp, timeout);
1496 static void sfp_sm_mod_next(struct sfp *sfp, unsigned int state,
1497 unsigned int timeout)
1499 sfp->sm_mod_state = state;
1500 sfp_sm_set_timer(sfp, timeout);
1503 static void sfp_sm_phy_detach(struct sfp *sfp)
1505 sfp_remove_phy(sfp->sfp_bus);
1506 phy_device_remove(sfp->mod_phy);
1507 phy_device_free(sfp->mod_phy);
1508 sfp->mod_phy = NULL;
1511 static int sfp_sm_probe_phy(struct sfp *sfp, bool is_c45)
1513 struct phy_device *phy;
1516 phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45);
1517 if (phy == ERR_PTR(-ENODEV))
1518 return PTR_ERR(phy);
1520 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1521 return PTR_ERR(phy);
1524 err = phy_device_register(phy);
1526 phy_device_free(phy);
1527 dev_err(sfp->dev, "phy_device_register failed: %d\n", err);
1531 err = sfp_add_phy(sfp->sfp_bus, phy);
1533 phy_device_remove(phy);
1534 phy_device_free(phy);
1535 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1544 static void sfp_sm_link_up(struct sfp *sfp)
1546 sfp_link_up(sfp->sfp_bus);
1547 sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1550 static void sfp_sm_link_down(struct sfp *sfp)
1552 sfp_link_down(sfp->sfp_bus);
1555 static void sfp_sm_link_check_los(struct sfp *sfp)
1557 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1558 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1559 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1562 /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1563 * are set, we assume that no LOS signal is available. If both are
1564 * set, we assume LOS is not implemented (and is meaningless.)
1566 if (los_options == los_inverted)
1567 los = !(sfp->state & SFP_F_LOS);
1568 else if (los_options == los_normal)
1569 los = !!(sfp->state & SFP_F_LOS);
1572 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1574 sfp_sm_link_up(sfp);
1577 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1579 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1580 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1581 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1583 return (los_options == los_inverted && event == SFP_E_LOS_LOW) ||
1584 (los_options == los_normal && event == SFP_E_LOS_HIGH);
1587 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1589 const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
1590 const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
1591 __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
1593 return (los_options == los_inverted && event == SFP_E_LOS_HIGH) ||
1594 (los_options == los_normal && event == SFP_E_LOS_LOW);
1597 static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
1599 if (sfp->sm_fault_retries && !--sfp->sm_fault_retries) {
1601 "module persistently indicates fault, disabling\n");
1602 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1605 dev_err(sfp->dev, "module transmit fault indicated\n");
1607 sfp_sm_next(sfp, next_state, T_FAULT_RECOVER);
1611 /* Probe a SFP for a PHY device if the module supports copper - the PHY
1612 * normally sits at I2C bus address 0x56, and may either be a clause 22
1615 * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with
1616 * negotiation enabled, but some may be in 1000base-X - which is for the
1617 * PHY driver to determine.
1619 * Clause 45 copper SFP+ modules (10G) appear to switch their interface
1620 * mode according to the negotiated line speed.
1622 static int sfp_sm_probe_for_phy(struct sfp *sfp)
1626 switch (sfp->id.base.extended_cc) {
1627 case SFF8024_ECC_10GBASE_T_SFI:
1628 case SFF8024_ECC_10GBASE_T_SR:
1629 case SFF8024_ECC_5GBASE_T:
1630 case SFF8024_ECC_2_5GBASE_T:
1631 err = sfp_sm_probe_phy(sfp, true);
1635 if (sfp->id.base.e1000_base_t)
1636 err = sfp_sm_probe_phy(sfp, false);
1642 static int sfp_module_parse_power(struct sfp *sfp)
1644 u32 power_mW = 1000;
1647 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1649 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1652 supports_a2 = sfp->id.ext.sff8472_compliance !=
1653 SFP_SFF8472_COMPLIANCE_NONE ||
1654 sfp->id.ext.diagmon & SFP_DIAGMON_DDM;
1656 if (power_mW > sfp->max_power_mW) {
1657 /* Module power specification exceeds the allowed maximum. */
1659 /* The module appears not to implement bus address
1660 * 0xa2, so assume that the module powers up in the
1664 "Host does not support %u.%uW modules\n",
1665 power_mW / 1000, (power_mW / 100) % 10);
1669 "Host does not support %u.%uW modules, module left in power mode 1\n",
1670 power_mW / 1000, (power_mW / 100) % 10);
1675 if (power_mW <= 1000) {
1676 /* Modules below 1W do not require a power change sequence */
1677 sfp->module_power_mW = power_mW;
1682 /* The module power level is below the host maximum and the
1683 * module appears not to implement bus address 0xa2, so assume
1684 * that the module powers up in the indicated mode.
1689 /* If the module requires a higher power mode, but also requires
1690 * an address change sequence, warn the user that the module may
1691 * not be functional.
1693 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) {
1695 "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n",
1696 power_mW / 1000, (power_mW / 100) % 10);
1700 sfp->module_power_mW = power_mW;
1705 static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
1710 err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1711 if (err != sizeof(val)) {
1712 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1716 /* DM7052 reports as a high power module, responds to reads (with
1717 * all bytes 0xff) at 0x51 but does not accept writes. In any case,
1718 * if the bit is already set, we're already in high power mode.
1720 if (!!(val & BIT(0)) == enable)
1728 err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1729 if (err != sizeof(val)) {
1730 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1735 dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1736 sfp->module_power_mW / 1000,
1737 (sfp->module_power_mW / 100) % 10);
1742 /* GPON modules based on Realtek RTL8672 and RTL9601C chips (e.g. V-SOL
1743 * V2801F, CarlitoxxPro CPGOS03-0490, Ubiquiti U-Fiber Instant, ...) do
1744 * not support multibyte reads from the EEPROM. Each multi-byte read
1745 * operation returns just one byte of EEPROM followed by zeros. There is
1746 * no way to identify which modules are using Realtek RTL8672 and RTL9601C
1747 * chips. Moreover every OEM of V-SOL V2801F module puts its own vendor
1748 * name and vendor id into EEPROM, so there is even no way to detect if
1749 * module is V-SOL V2801F. Therefore check for those zeros in the read
1750 * data and then based on check switch to reading EEPROM to one byte
1753 static bool sfp_id_needs_byte_io(struct sfp *sfp, void *buf, size_t len)
1755 size_t i, block_size = sfp->i2c_block_size;
1757 /* Already using byte IO */
1758 if (block_size == 1)
1761 for (i = 1; i < len; i += block_size) {
1762 if (memchr_inv(buf + i, '\0', min(block_size - 1, len - i)))
1768 static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
1773 if (id->base.phys_id != SFF8024_ID_SFF_8472 ||
1774 id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP ||
1775 id->base.connector != SFF8024_CONNECTOR_LC) {
1776 dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n");
1777 id->base.phys_id = SFF8024_ID_SFF_8472;
1778 id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP;
1779 id->base.connector = SFF8024_CONNECTOR_LC;
1780 err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3);
1782 dev_err(sfp->dev, "Failed to rewrite module EEPROM: %d\n", err);
1786 /* Cotsworks modules have been found to require a delay between write operations. */
1789 /* Update base structure checksum */
1790 check = sfp_check(&id->base, sizeof(id->base) - 1);
1791 err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1);
1793 dev_err(sfp->dev, "Failed to update base structure checksum in fiber module EEPROM: %d\n", err);
1800 static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
1802 /* SFP module inserted - read I2C data */
1803 struct sfp_eeprom_id id;
1804 bool cotsworks_sfbg;
1809 /* Some SFP modules and also some Linux I2C drivers do not like reads
1810 * longer than 16 bytes, so read the EEPROM in chunks of 16 bytes at
1813 sfp->i2c_block_size = 16;
1815 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
1818 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1822 if (ret != sizeof(id.base)) {
1823 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1827 /* Some SFP modules (e.g. Nokia 3FE46541AA) lock up if read from
1828 * address 0x51 is just one byte at a time. Also SFF-8472 requires
1829 * that EEPROM supports atomic 16bit read operation for diagnostic
1830 * fields, so do not switch to one byte reading at a time unless it
1831 * is really required and we have no other option.
1833 if (sfp_id_needs_byte_io(sfp, &id.base, sizeof(id.base))) {
1835 "Detected broken RTL8672/RTL9601C emulated EEPROM\n");
1837 "Switching to reading EEPROM to one byte at a time\n");
1838 sfp->i2c_block_size = 1;
1840 ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
1843 dev_err(sfp->dev, "failed to read EEPROM: %d\n",
1848 if (ret != sizeof(id.base)) {
1849 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1854 /* Cotsworks do not seem to update the checksums when they
1855 * do the final programming with the final module part number,
1856 * serial number and date code.
1858 cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16);
1859 cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4);
1861 /* Cotsworks SFF module EEPROM do not always have valid phys_id,
1862 * phys_ext_id, and connector bytes. Rewrite SFF EEPROM bytes if
1863 * Cotsworks PN matches and bytes are not correct.
1865 if (cotsworks && cotsworks_sfbg) {
1866 ret = sfp_cotsworks_fixup_check(sfp, &id);
1871 /* Validate the checksum over the base structure */
1872 check = sfp_check(&id.base, sizeof(id.base) - 1);
1873 if (check != id.base.cc_base) {
1876 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1877 check, id.base.cc_base);
1880 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1881 check, id.base.cc_base);
1882 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1883 16, 1, &id, sizeof(id), true);
1888 ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext));
1891 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1895 if (ret != sizeof(id.ext)) {
1896 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1900 check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1901 if (check != id.ext.cc_ext) {
1904 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1905 check, id.ext.cc_ext);
1908 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1909 check, id.ext.cc_ext);
1910 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1911 16, 1, &id, sizeof(id), true);
1912 memset(&id.ext, 0, sizeof(id.ext));
1918 dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1919 (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1920 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1921 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1922 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1923 (int)sizeof(id.ext.datecode), id.ext.datecode);
1925 /* Check whether we support this module */
1926 if (!sfp->type->module_supported(&id)) {
1928 "module is not supported - phys id 0x%02x 0x%02x\n",
1929 sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1933 /* If the module requires address swap mode, warn about it */
1934 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1936 "module address swap to access page 0xA2 is not supported.\n");
1938 /* Parse the module power requirement */
1939 ret = sfp_module_parse_power(sfp);
1943 if (!memcmp(id.base.vendor_name, "ALCATELLUCENT ", 16) &&
1944 !memcmp(id.base.vendor_pn, "3FE46541AA ", 16))
1945 sfp->module_t_start_up = T_START_UP_BAD_GPON;
1947 sfp->module_t_start_up = T_START_UP;
1949 if (!memcmp(id.base.vendor_name, "HUAWEI ", 16) &&
1950 !memcmp(id.base.vendor_pn, "MA5671A ", 16))
1951 sfp->tx_fault_ignore = true;
1953 sfp->tx_fault_ignore = false;
1958 static void sfp_sm_mod_remove(struct sfp *sfp)
1960 if (sfp->sm_mod_state > SFP_MOD_WAITDEV)
1961 sfp_module_remove(sfp->sfp_bus);
1963 sfp_hwmon_remove(sfp);
1965 memset(&sfp->id, 0, sizeof(sfp->id));
1966 sfp->module_power_mW = 0;
1968 dev_info(sfp->dev, "module removed\n");
1971 /* This state machine tracks the upstream's state */
1972 static void sfp_sm_device(struct sfp *sfp, unsigned int event)
1974 switch (sfp->sm_dev_state) {
1976 if (event == SFP_E_DEV_ATTACH)
1977 sfp->sm_dev_state = SFP_DEV_DOWN;
1981 if (event == SFP_E_DEV_DETACH)
1982 sfp->sm_dev_state = SFP_DEV_DETACHED;
1983 else if (event == SFP_E_DEV_UP)
1984 sfp->sm_dev_state = SFP_DEV_UP;
1988 if (event == SFP_E_DEV_DETACH)
1989 sfp->sm_dev_state = SFP_DEV_DETACHED;
1990 else if (event == SFP_E_DEV_DOWN)
1991 sfp->sm_dev_state = SFP_DEV_DOWN;
1996 /* This state machine tracks the insert/remove state of the module, probes
1997 * the on-board EEPROM, and sets up the power level.
1999 static void sfp_sm_module(struct sfp *sfp, unsigned int event)
2003 /* Handle remove event globally, it resets this state machine */
2004 if (event == SFP_E_REMOVE) {
2005 if (sfp->sm_mod_state > SFP_MOD_PROBE)
2006 sfp_sm_mod_remove(sfp);
2007 sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
2011 /* Handle device detach globally */
2012 if (sfp->sm_dev_state < SFP_DEV_DOWN &&
2013 sfp->sm_mod_state > SFP_MOD_WAITDEV) {
2014 if (sfp->module_power_mW > 1000 &&
2015 sfp->sm_mod_state > SFP_MOD_HPOWER)
2016 sfp_sm_mod_hpower(sfp, false);
2017 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
2021 switch (sfp->sm_mod_state) {
2023 if (event == SFP_E_INSERT) {
2024 sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL);
2025 sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT;
2026 sfp->sm_mod_tries = R_PROBE_RETRY_SLOW;
2031 /* Wait for T_PROBE_INIT to time out */
2032 if (event != SFP_E_TIMEOUT)
2035 err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1);
2036 if (err == -EAGAIN) {
2037 if (sfp->sm_mod_tries_init &&
2038 --sfp->sm_mod_tries_init) {
2039 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
2041 } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) {
2042 if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1)
2044 "please wait, module slow to respond\n");
2045 sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW);
2050 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2054 err = sfp_hwmon_insert(sfp);
2056 dev_warn(sfp->dev, "hwmon probe failed: %d\n", err);
2058 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
2060 case SFP_MOD_WAITDEV:
2061 /* Ensure that the device is attached before proceeding */
2062 if (sfp->sm_dev_state < SFP_DEV_DOWN)
2065 /* Report the module insertion to the upstream device */
2066 err = sfp_module_insert(sfp->sfp_bus, &sfp->id);
2068 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2072 /* If this is a power level 1 module, we are done */
2073 if (sfp->module_power_mW <= 1000)
2076 sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0);
2078 case SFP_MOD_HPOWER:
2079 /* Enable high power mode */
2080 err = sfp_sm_mod_hpower(sfp, true);
2082 if (err != -EAGAIN) {
2083 sfp_module_remove(sfp->sfp_bus);
2084 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
2086 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
2091 sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
2094 case SFP_MOD_WAITPWR:
2095 /* Wait for T_HPOWER_LEVEL to time out */
2096 if (event != SFP_E_TIMEOUT)
2100 sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0);
2103 case SFP_MOD_PRESENT:
2109 static void sfp_sm_main(struct sfp *sfp, unsigned int event)
2111 unsigned long timeout;
2114 /* Some events are global */
2115 if (sfp->sm_state != SFP_S_DOWN &&
2116 (sfp->sm_mod_state != SFP_MOD_PRESENT ||
2117 sfp->sm_dev_state != SFP_DEV_UP)) {
2118 if (sfp->sm_state == SFP_S_LINK_UP &&
2119 sfp->sm_dev_state == SFP_DEV_UP)
2120 sfp_sm_link_down(sfp);
2121 if (sfp->sm_state > SFP_S_INIT)
2122 sfp_module_stop(sfp->sfp_bus);
2124 sfp_sm_phy_detach(sfp);
2125 sfp_module_tx_disable(sfp);
2126 sfp_soft_stop_poll(sfp);
2127 sfp_sm_next(sfp, SFP_S_DOWN, 0);
2131 /* The main state machine */
2132 switch (sfp->sm_state) {
2134 if (sfp->sm_mod_state != SFP_MOD_PRESENT ||
2135 sfp->sm_dev_state != SFP_DEV_UP)
2138 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE))
2139 sfp_soft_start_poll(sfp);
2141 sfp_module_tx_enable(sfp);
2143 /* Initialise the fault clearance retries */
2144 sfp->sm_fault_retries = N_FAULT_INIT;
2146 /* We need to check the TX_FAULT state, which is not defined
2147 * while TX_DISABLE is asserted. The earliest we want to do
2148 * anything (such as probe for a PHY) is 50ms.
2150 sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT);
2154 if (event != SFP_E_TIMEOUT)
2157 if (sfp->state & SFP_F_TX_FAULT) {
2158 /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431)
2159 * from the TX_DISABLE deassertion for the module to
2160 * initialise, which is indicated by TX_FAULT
2163 timeout = sfp->module_t_start_up;
2164 if (timeout > T_WAIT)
2169 sfp_sm_next(sfp, SFP_S_INIT, timeout);
2171 /* TX_FAULT is not asserted, assume the module has
2172 * finished initialising.
2179 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2180 /* TX_FAULT is still asserted after t_init
2181 * or t_start_up, so assume there is a fault.
2183 sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
2184 sfp->sm_fault_retries == N_FAULT_INIT);
2185 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2187 sfp->sm_phy_retries = R_PHY_RETRY;
2192 case SFP_S_INIT_PHY:
2193 if (event != SFP_E_TIMEOUT)
2196 /* TX_FAULT deasserted or we timed out with TX_FAULT
2197 * clear. Probe for the PHY and check the LOS state.
2199 ret = sfp_sm_probe_for_phy(sfp);
2200 if (ret == -ENODEV) {
2201 if (--sfp->sm_phy_retries) {
2202 sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY);
2205 dev_info(sfp->dev, "no PHY detected\n");
2208 sfp_sm_next(sfp, SFP_S_FAIL, 0);
2211 if (sfp_module_start(sfp->sfp_bus)) {
2212 sfp_sm_next(sfp, SFP_S_FAIL, 0);
2215 sfp_sm_link_check_los(sfp);
2217 /* Reset the fault retry count */
2218 sfp->sm_fault_retries = N_FAULT;
2221 case SFP_S_INIT_TX_FAULT:
2222 if (event == SFP_E_TIMEOUT) {
2223 sfp_module_tx_fault_reset(sfp);
2224 sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up);
2228 case SFP_S_WAIT_LOS:
2229 if (event == SFP_E_TX_FAULT)
2230 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2231 else if (sfp_los_event_inactive(sfp, event))
2232 sfp_sm_link_up(sfp);
2236 if (event == SFP_E_TX_FAULT) {
2237 sfp_sm_link_down(sfp);
2238 sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2239 } else if (sfp_los_event_active(sfp, event)) {
2240 sfp_sm_link_down(sfp);
2241 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
2245 case SFP_S_TX_FAULT:
2246 if (event == SFP_E_TIMEOUT) {
2247 sfp_module_tx_fault_reset(sfp);
2248 sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up);
2253 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2254 sfp_sm_fault(sfp, SFP_S_TX_FAULT, false);
2255 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2256 dev_info(sfp->dev, "module transmit fault recovered\n");
2257 sfp_sm_link_check_los(sfp);
2261 case SFP_S_TX_DISABLE:
2266 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
2268 mutex_lock(&sfp->sm_mutex);
2270 dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
2271 mod_state_to_str(sfp->sm_mod_state),
2272 dev_state_to_str(sfp->sm_dev_state),
2273 sm_state_to_str(sfp->sm_state),
2274 event_to_str(event));
2276 sfp_sm_device(sfp, event);
2277 sfp_sm_module(sfp, event);
2278 sfp_sm_main(sfp, event);
2280 dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
2281 mod_state_to_str(sfp->sm_mod_state),
2282 dev_state_to_str(sfp->sm_dev_state),
2283 sm_state_to_str(sfp->sm_state));
2285 mutex_unlock(&sfp->sm_mutex);
2288 static void sfp_attach(struct sfp *sfp)
2290 sfp_sm_event(sfp, SFP_E_DEV_ATTACH);
2293 static void sfp_detach(struct sfp *sfp)
2295 sfp_sm_event(sfp, SFP_E_DEV_DETACH);
2298 static void sfp_start(struct sfp *sfp)
2300 sfp_sm_event(sfp, SFP_E_DEV_UP);
2303 static void sfp_stop(struct sfp *sfp)
2305 sfp_sm_event(sfp, SFP_E_DEV_DOWN);
2308 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
2310 /* locking... and check module is present */
2312 if (sfp->id.ext.sff8472_compliance &&
2313 !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
2314 modinfo->type = ETH_MODULE_SFF_8472;
2315 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
2317 modinfo->type = ETH_MODULE_SFF_8079;
2318 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
2323 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
2326 unsigned int first, last, len;
2333 last = ee->offset + ee->len;
2334 if (first < ETH_MODULE_SFF_8079_LEN) {
2335 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
2338 ret = sfp_read(sfp, false, first, data, len);
2345 if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
2346 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
2348 first -= ETH_MODULE_SFF_8079_LEN;
2350 ret = sfp_read(sfp, true, first, data, len);
2357 static int sfp_module_eeprom_by_page(struct sfp *sfp,
2358 const struct ethtool_module_eeprom *page,
2359 struct netlink_ext_ack *extack)
2362 NL_SET_ERR_MSG(extack, "Banks not supported");
2367 NL_SET_ERR_MSG(extack, "Only page 0 supported");
2371 if (page->i2c_address != 0x50 &&
2372 page->i2c_address != 0x51) {
2373 NL_SET_ERR_MSG(extack, "Only address 0x50 and 0x51 supported");
2377 return sfp_read(sfp, page->i2c_address == 0x51, page->offset,
2378 page->data, page->length);
2381 static const struct sfp_socket_ops sfp_module_ops = {
2382 .attach = sfp_attach,
2383 .detach = sfp_detach,
2386 .module_info = sfp_module_info,
2387 .module_eeprom = sfp_module_eeprom,
2388 .module_eeprom_by_page = sfp_module_eeprom_by_page,
2391 static void sfp_timeout(struct work_struct *work)
2393 struct sfp *sfp = container_of(work, struct sfp, timeout.work);
2396 sfp_sm_event(sfp, SFP_E_TIMEOUT);
2400 static void sfp_check_state(struct sfp *sfp)
2402 unsigned int state, i, changed;
2404 mutex_lock(&sfp->st_mutex);
2405 state = sfp_get_state(sfp);
2406 changed = state ^ sfp->state;
2407 if (sfp->tx_fault_ignore)
2408 changed &= SFP_F_PRESENT | SFP_F_LOS;
2410 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
2412 for (i = 0; i < GPIO_MAX; i++)
2413 if (changed & BIT(i))
2414 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
2415 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
2417 state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
2421 if (changed & SFP_F_PRESENT)
2422 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
2423 SFP_E_INSERT : SFP_E_REMOVE);
2425 if (changed & SFP_F_TX_FAULT)
2426 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
2427 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
2429 if (changed & SFP_F_LOS)
2430 sfp_sm_event(sfp, state & SFP_F_LOS ?
2431 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
2433 mutex_unlock(&sfp->st_mutex);
2436 static irqreturn_t sfp_irq(int irq, void *data)
2438 struct sfp *sfp = data;
2440 sfp_check_state(sfp);
2445 static void sfp_poll(struct work_struct *work)
2447 struct sfp *sfp = container_of(work, struct sfp, poll.work);
2449 sfp_check_state(sfp);
2451 if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) ||
2453 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2456 static struct sfp *sfp_alloc(struct device *dev)
2460 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
2462 return ERR_PTR(-ENOMEM);
2466 mutex_init(&sfp->sm_mutex);
2467 mutex_init(&sfp->st_mutex);
2468 INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
2469 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
2471 sfp_hwmon_init(sfp);
2476 static void sfp_cleanup(void *data)
2478 struct sfp *sfp = data;
2480 sfp_hwmon_exit(sfp);
2482 cancel_delayed_work_sync(&sfp->poll);
2483 cancel_delayed_work_sync(&sfp->timeout);
2485 mdiobus_unregister(sfp->i2c_mii);
2486 mdiobus_free(sfp->i2c_mii);
2489 i2c_put_adapter(sfp->i2c);
2493 static int sfp_probe(struct platform_device *pdev)
2495 const struct sff_data *sff;
2496 struct i2c_adapter *i2c;
2501 sfp = sfp_alloc(&pdev->dev);
2503 return PTR_ERR(sfp);
2505 platform_set_drvdata(pdev, sfp);
2507 err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
2511 sff = sfp->type = &sfp_data;
2513 if (pdev->dev.of_node) {
2514 struct device_node *node = pdev->dev.of_node;
2515 const struct of_device_id *id;
2516 struct device_node *np;
2518 id = of_match_node(sfp_of_match, node);
2522 sff = sfp->type = id->data;
2524 np = of_parse_phandle(node, "i2c-bus", 0);
2526 dev_err(sfp->dev, "missing 'i2c-bus' property\n");
2530 i2c = of_find_i2c_adapter_by_node(np);
2532 } else if (has_acpi_companion(&pdev->dev)) {
2533 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
2534 struct fwnode_handle *fw = acpi_fwnode_handle(adev);
2535 struct fwnode_reference_args args;
2536 struct acpi_handle *acpi_handle;
2539 ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args);
2540 if (ret || !is_acpi_device_node(args.fwnode)) {
2541 dev_err(&pdev->dev, "missing 'i2c-bus' property\n");
2545 acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode);
2546 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
2552 return -EPROBE_DEFER;
2554 err = sfp_i2c_configure(sfp, i2c);
2556 i2c_put_adapter(i2c);
2560 for (i = 0; i < GPIO_MAX; i++)
2561 if (sff->gpios & BIT(i)) {
2562 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
2563 gpio_of_names[i], gpio_flags[i]);
2564 if (IS_ERR(sfp->gpio[i]))
2565 return PTR_ERR(sfp->gpio[i]);
2568 sfp->get_state = sfp_gpio_get_state;
2569 sfp->set_state = sfp_gpio_set_state;
2571 /* Modules that have no detect signal are always present */
2572 if (!(sfp->gpio[GPIO_MODDEF0]))
2573 sfp->get_state = sff_gpio_get_state;
2575 device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
2576 &sfp->max_power_mW);
2577 if (!sfp->max_power_mW)
2578 sfp->max_power_mW = 1000;
2580 dev_info(sfp->dev, "Host maximum power %u.%uW\n",
2581 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
2583 /* Get the initial state, and always signal TX disable,
2584 * since the network interface will not be up.
2586 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
2588 if (sfp->gpio[GPIO_RATE_SELECT] &&
2589 gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
2590 sfp->state |= SFP_F_RATE_SELECT;
2591 sfp_set_state(sfp, sfp->state);
2592 sfp_module_tx_disable(sfp);
2593 if (sfp->state & SFP_F_PRESENT) {
2595 sfp_sm_event(sfp, SFP_E_INSERT);
2599 for (i = 0; i < GPIO_MAX; i++) {
2600 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
2603 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
2604 if (sfp->gpio_irq[i] < 0) {
2605 sfp->gpio_irq[i] = 0;
2606 sfp->need_poll = true;
2610 sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL,
2611 "%s-%s", dev_name(sfp->dev),
2617 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
2620 IRQF_TRIGGER_RISING |
2621 IRQF_TRIGGER_FALLING,
2624 sfp->gpio_irq[i] = 0;
2625 sfp->need_poll = true;
2630 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2632 /* We could have an issue in cases no Tx disable pin is available or
2633 * wired as modules using a laser as their light source will continue to
2634 * be active when the fiber is removed. This could be a safety issue and
2635 * we should at least warn the user about that.
2637 if (!sfp->gpio[GPIO_TX_DISABLE])
2639 "No tx_disable pin: SFP modules will always be emitting.\n");
2641 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
2645 sfp_debugfs_init(sfp);
2650 static int sfp_remove(struct platform_device *pdev)
2652 struct sfp *sfp = platform_get_drvdata(pdev);
2654 sfp_debugfs_exit(sfp);
2655 sfp_unregister_socket(sfp->sfp_bus);
2658 sfp_sm_event(sfp, SFP_E_REMOVE);
2664 static void sfp_shutdown(struct platform_device *pdev)
2666 struct sfp *sfp = platform_get_drvdata(pdev);
2669 for (i = 0; i < GPIO_MAX; i++) {
2670 if (!sfp->gpio_irq[i])
2673 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp);
2676 cancel_delayed_work_sync(&sfp->poll);
2677 cancel_delayed_work_sync(&sfp->timeout);
2680 static struct platform_driver sfp_driver = {
2682 .remove = sfp_remove,
2683 .shutdown = sfp_shutdown,
2686 .of_match_table = sfp_of_match,
2690 static int sfp_init(void)
2692 poll_jiffies = msecs_to_jiffies(100);
2694 return platform_driver_register(&sfp_driver);
2696 module_init(sfp_init);
2698 static void sfp_exit(void)
2700 platform_driver_unregister(&sfp_driver);
2702 module_exit(sfp_exit);
2704 MODULE_ALIAS("platform:sfp");
2705 MODULE_AUTHOR("Russell King");
2706 MODULE_LICENSE("GPL v2");