1 #include <linux/ctype.h>
2 #include <linux/delay.h>
3 #include <linux/gpio/consumer.h>
4 #include <linux/hwmon.h>
6 #include <linux/interrupt.h>
7 #include <linux/jiffies.h>
8 #include <linux/module.h>
9 #include <linux/mutex.h>
11 #include <linux/phy.h>
12 #include <linux/platform_device.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/slab.h>
15 #include <linux/workqueue.h>
29 SFP_F_PRESENT = BIT(GPIO_MODDEF0),
30 SFP_F_LOS = BIT(GPIO_LOS),
31 SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
32 SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
33 SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
63 static const char * const mod_state_strings[] = {
64 [SFP_MOD_EMPTY] = "empty",
65 [SFP_MOD_PROBE] = "probe",
66 [SFP_MOD_HPOWER] = "hpower",
67 [SFP_MOD_PRESENT] = "present",
68 [SFP_MOD_ERROR] = "error",
71 static const char *mod_state_to_str(unsigned short mod_state)
73 if (mod_state >= ARRAY_SIZE(mod_state_strings))
74 return "Unknown module state";
75 return mod_state_strings[mod_state];
78 static const char * const dev_state_strings[] = {
79 [SFP_DEV_DOWN] = "down",
83 static const char *dev_state_to_str(unsigned short dev_state)
85 if (dev_state >= ARRAY_SIZE(dev_state_strings))
86 return "Unknown device state";
87 return dev_state_strings[dev_state];
90 static const char * const event_strings[] = {
91 [SFP_E_INSERT] = "insert",
92 [SFP_E_REMOVE] = "remove",
93 [SFP_E_DEV_DOWN] = "dev_down",
94 [SFP_E_DEV_UP] = "dev_up",
95 [SFP_E_TX_FAULT] = "tx_fault",
96 [SFP_E_TX_CLEAR] = "tx_clear",
97 [SFP_E_LOS_HIGH] = "los_high",
98 [SFP_E_LOS_LOW] = "los_low",
99 [SFP_E_TIMEOUT] = "timeout",
102 static const char *event_to_str(unsigned short event)
104 if (event >= ARRAY_SIZE(event_strings))
105 return "Unknown event";
106 return event_strings[event];
109 static const char * const sm_state_strings[] = {
110 [SFP_S_DOWN] = "down",
111 [SFP_S_INIT] = "init",
112 [SFP_S_WAIT_LOS] = "wait_los",
113 [SFP_S_LINK_UP] = "link_up",
114 [SFP_S_TX_FAULT] = "tx_fault",
115 [SFP_S_REINIT] = "reinit",
116 [SFP_S_TX_DISABLE] = "rx_disable",
119 static const char *sm_state_to_str(unsigned short sm_state)
121 if (sm_state >= ARRAY_SIZE(sm_state_strings))
122 return "Unknown state";
123 return sm_state_strings[sm_state];
126 static const char *gpio_of_names[] = {
134 static const enum gpiod_flags gpio_flags[] = {
142 #define T_INIT_JIFFIES msecs_to_jiffies(300)
143 #define T_RESET_US 10
144 #define T_FAULT_RECOVER msecs_to_jiffies(1000)
146 /* SFP module presence detection is poor: the three MOD DEF signals are
147 * the same length on the PCB, which means it's possible for MOD DEF 0 to
148 * connect before the I2C bus on MOD DEF 1/2.
150 * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
151 * be deasserted) but makes no mention of the earliest time before we can
152 * access the I2C EEPROM. However, Avago modules require 300ms.
154 #define T_PROBE_INIT msecs_to_jiffies(300)
155 #define T_HPOWER_LEVEL msecs_to_jiffies(300)
156 #define T_PROBE_RETRY msecs_to_jiffies(100)
158 /* SFP modules appear to always have their PHY configured for bus address
159 * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
161 #define SFP_PHY_ADDR 22
163 /* Give this long for the PHY to reset. */
164 #define T_PHY_RESET_MS 50
166 static DEFINE_MUTEX(sfp_mutex);
170 bool (*module_supported)(const struct sfp_eeprom_id *id);
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;
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);
187 struct gpio_desc *gpio[GPIO_MAX];
190 struct delayed_work poll;
191 struct delayed_work timeout;
192 struct mutex sm_mutex;
193 unsigned char sm_mod_state;
194 unsigned char sm_dev_state;
195 unsigned short sm_state;
196 unsigned int sm_retries;
198 struct sfp_eeprom_id id;
199 #if IS_ENABLED(CONFIG_HWMON)
200 struct sfp_diag diag;
201 struct device *hwmon_dev;
207 static bool sff_module_supported(const struct sfp_eeprom_id *id)
209 return id->base.phys_id == SFP_PHYS_ID_SFF &&
210 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
213 static const struct sff_data sff_data = {
214 .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
215 .module_supported = sff_module_supported,
218 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
220 return id->base.phys_id == SFP_PHYS_ID_SFP &&
221 id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
224 static const struct sff_data sfp_data = {
225 .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
226 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
227 .module_supported = sfp_module_supported,
230 static const struct of_device_id sfp_of_match[] = {
231 { .compatible = "sff,sff", .data = &sff_data, },
232 { .compatible = "sff,sfp", .data = &sfp_data, },
235 MODULE_DEVICE_TABLE(of, sfp_of_match);
237 static unsigned long poll_jiffies;
239 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
241 unsigned int i, state, v;
243 for (i = state = 0; i < GPIO_MAX; i++) {
244 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
247 v = gpiod_get_value_cansleep(sfp->gpio[i]);
255 static unsigned int sff_gpio_get_state(struct sfp *sfp)
257 return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
260 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
262 if (state & SFP_F_PRESENT) {
263 /* If the module is present, drive the signals */
264 if (sfp->gpio[GPIO_TX_DISABLE])
265 gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
266 state & SFP_F_TX_DISABLE);
267 if (state & SFP_F_RATE_SELECT)
268 gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
269 state & SFP_F_RATE_SELECT);
271 /* Otherwise, let them float to the pull-ups */
272 if (sfp->gpio[GPIO_TX_DISABLE])
273 gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
274 if (state & SFP_F_RATE_SELECT)
275 gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
279 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
282 struct i2c_msg msgs[2];
283 u8 bus_addr = a2 ? 0x51 : 0x50;
286 msgs[0].addr = bus_addr;
289 msgs[0].buf = &dev_addr;
290 msgs[1].addr = bus_addr;
291 msgs[1].flags = I2C_M_RD;
295 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
299 return ret == ARRAY_SIZE(msgs) ? len : 0;
302 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
305 struct i2c_msg msgs[1];
306 u8 bus_addr = a2 ? 0x51 : 0x50;
309 msgs[0].addr = bus_addr;
311 msgs[0].len = 1 + len;
312 msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
316 msgs[0].buf[0] = dev_addr;
317 memcpy(&msgs[0].buf[1], buf, len);
319 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
326 return ret == ARRAY_SIZE(msgs) ? len : 0;
329 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
331 struct mii_bus *i2c_mii;
334 if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
338 sfp->read = sfp_i2c_read;
339 sfp->write = sfp_i2c_write;
341 i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
343 return PTR_ERR(i2c_mii);
345 i2c_mii->name = "SFP I2C Bus";
346 i2c_mii->phy_mask = ~0;
348 ret = mdiobus_register(i2c_mii);
350 mdiobus_free(i2c_mii);
354 sfp->i2c_mii = i2c_mii;
360 static unsigned int sfp_get_state(struct sfp *sfp)
362 return sfp->get_state(sfp);
365 static void sfp_set_state(struct sfp *sfp, unsigned int state)
367 sfp->set_state(sfp, state);
370 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
372 return sfp->read(sfp, a2, addr, buf, len);
375 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
377 return sfp->write(sfp, a2, addr, buf, len);
380 static unsigned int sfp_check(void *buf, size_t len)
384 for (p = buf, check = 0; len; p++, len--)
391 #if IS_ENABLED(CONFIG_HWMON)
392 static umode_t sfp_hwmon_is_visible(const void *data,
393 enum hwmon_sensor_types type,
394 u32 attr, int channel)
396 const struct sfp *sfp = data;
401 case hwmon_temp_min_alarm:
402 case hwmon_temp_max_alarm:
403 case hwmon_temp_lcrit_alarm:
404 case hwmon_temp_crit_alarm:
407 case hwmon_temp_lcrit:
408 case hwmon_temp_crit:
409 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
412 case hwmon_temp_input:
419 case hwmon_in_min_alarm:
420 case hwmon_in_max_alarm:
421 case hwmon_in_lcrit_alarm:
422 case hwmon_in_crit_alarm:
427 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
437 case hwmon_curr_min_alarm:
438 case hwmon_curr_max_alarm:
439 case hwmon_curr_lcrit_alarm:
440 case hwmon_curr_crit_alarm:
443 case hwmon_curr_lcrit:
444 case hwmon_curr_crit:
445 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
448 case hwmon_curr_input:
454 /* External calibration of receive power requires
455 * floating point arithmetic. Doing that in the kernel
456 * is not easy, so just skip it. If the module does
457 * not require external calibration, we can however
458 * show receiver power, since FP is then not needed.
460 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
464 case hwmon_power_min_alarm:
465 case hwmon_power_max_alarm:
466 case hwmon_power_lcrit_alarm:
467 case hwmon_power_crit_alarm:
468 case hwmon_power_min:
469 case hwmon_power_max:
470 case hwmon_power_lcrit:
471 case hwmon_power_crit:
472 if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
475 case hwmon_power_input:
485 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
490 err = sfp_read(sfp, true, reg, &val, sizeof(val));
494 *value = be16_to_cpu(val);
499 static void sfp_hwmon_to_rx_power(long *value)
501 *value = DIV_ROUND_CLOSEST(*value, 100);
504 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
507 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
508 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
511 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
513 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
514 be16_to_cpu(sfp->diag.cal_t_offset), value);
516 if (*value >= 0x8000)
519 *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
522 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
524 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
525 be16_to_cpu(sfp->diag.cal_v_offset), value);
527 *value = DIV_ROUND_CLOSEST(*value, 10);
530 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
532 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
533 be16_to_cpu(sfp->diag.cal_txi_offset), value);
535 *value = DIV_ROUND_CLOSEST(*value, 500);
538 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
540 sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
541 be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
543 *value = DIV_ROUND_CLOSEST(*value, 10);
546 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
550 err = sfp_hwmon_read_sensor(sfp, reg, value);
554 sfp_hwmon_calibrate_temp(sfp, value);
559 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
563 err = sfp_hwmon_read_sensor(sfp, reg, value);
567 sfp_hwmon_calibrate_vcc(sfp, value);
572 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
576 err = sfp_hwmon_read_sensor(sfp, reg, value);
580 sfp_hwmon_calibrate_bias(sfp, value);
585 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
589 err = sfp_hwmon_read_sensor(sfp, reg, value);
593 sfp_hwmon_calibrate_tx_power(sfp, value);
598 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
602 err = sfp_hwmon_read_sensor(sfp, reg, value);
606 sfp_hwmon_to_rx_power(value);
611 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
617 case hwmon_temp_input:
618 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
620 case hwmon_temp_lcrit:
621 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
622 sfp_hwmon_calibrate_temp(sfp, value);
626 *value = be16_to_cpu(sfp->diag.temp_low_warn);
627 sfp_hwmon_calibrate_temp(sfp, value);
630 *value = be16_to_cpu(sfp->diag.temp_high_warn);
631 sfp_hwmon_calibrate_temp(sfp, value);
634 case hwmon_temp_crit:
635 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
636 sfp_hwmon_calibrate_temp(sfp, value);
639 case hwmon_temp_lcrit_alarm:
640 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
644 *value = !!(status & SFP_ALARM0_TEMP_LOW);
647 case hwmon_temp_min_alarm:
648 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
652 *value = !!(status & SFP_WARN0_TEMP_LOW);
655 case hwmon_temp_max_alarm:
656 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
660 *value = !!(status & SFP_WARN0_TEMP_HIGH);
663 case hwmon_temp_crit_alarm:
664 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
668 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
677 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
684 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
687 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
688 sfp_hwmon_calibrate_vcc(sfp, value);
692 *value = be16_to_cpu(sfp->diag.volt_low_warn);
693 sfp_hwmon_calibrate_vcc(sfp, value);
697 *value = be16_to_cpu(sfp->diag.volt_high_warn);
698 sfp_hwmon_calibrate_vcc(sfp, value);
702 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
703 sfp_hwmon_calibrate_vcc(sfp, value);
706 case hwmon_in_lcrit_alarm:
707 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
711 *value = !!(status & SFP_ALARM0_VCC_LOW);
714 case hwmon_in_min_alarm:
715 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
719 *value = !!(status & SFP_WARN0_VCC_LOW);
722 case hwmon_in_max_alarm:
723 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
727 *value = !!(status & SFP_WARN0_VCC_HIGH);
730 case hwmon_in_crit_alarm:
731 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
735 *value = !!(status & SFP_ALARM0_VCC_HIGH);
744 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
750 case hwmon_curr_input:
751 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
753 case hwmon_curr_lcrit:
754 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
755 sfp_hwmon_calibrate_bias(sfp, value);
759 *value = be16_to_cpu(sfp->diag.bias_low_warn);
760 sfp_hwmon_calibrate_bias(sfp, value);
764 *value = be16_to_cpu(sfp->diag.bias_high_warn);
765 sfp_hwmon_calibrate_bias(sfp, value);
768 case hwmon_curr_crit:
769 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
770 sfp_hwmon_calibrate_bias(sfp, value);
773 case hwmon_curr_lcrit_alarm:
774 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
778 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
781 case hwmon_curr_min_alarm:
782 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
786 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
789 case hwmon_curr_max_alarm:
790 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
794 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
797 case hwmon_curr_crit_alarm:
798 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
802 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
811 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
817 case hwmon_power_input:
818 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
820 case hwmon_power_lcrit:
821 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
822 sfp_hwmon_calibrate_tx_power(sfp, value);
825 case hwmon_power_min:
826 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
827 sfp_hwmon_calibrate_tx_power(sfp, value);
830 case hwmon_power_max:
831 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
832 sfp_hwmon_calibrate_tx_power(sfp, value);
835 case hwmon_power_crit:
836 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
837 sfp_hwmon_calibrate_tx_power(sfp, value);
840 case hwmon_power_lcrit_alarm:
841 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
845 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
848 case hwmon_power_min_alarm:
849 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
853 *value = !!(status & SFP_WARN0_TXPWR_LOW);
856 case hwmon_power_max_alarm:
857 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
861 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
864 case hwmon_power_crit_alarm:
865 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
869 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
878 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
884 case hwmon_power_input:
885 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
887 case hwmon_power_lcrit:
888 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
889 sfp_hwmon_to_rx_power(value);
892 case hwmon_power_min:
893 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
894 sfp_hwmon_to_rx_power(value);
897 case hwmon_power_max:
898 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
899 sfp_hwmon_to_rx_power(value);
902 case hwmon_power_crit:
903 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
904 sfp_hwmon_to_rx_power(value);
907 case hwmon_power_lcrit_alarm:
908 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
912 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
915 case hwmon_power_min_alarm:
916 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
920 *value = !!(status & SFP_WARN1_RXPWR_LOW);
923 case hwmon_power_max_alarm:
924 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
928 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
931 case hwmon_power_crit_alarm:
932 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
936 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
945 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
946 u32 attr, int channel, long *value)
948 struct sfp *sfp = dev_get_drvdata(dev);
952 return sfp_hwmon_temp(sfp, attr, value);
954 return sfp_hwmon_vcc(sfp, attr, value);
956 return sfp_hwmon_bias(sfp, attr, value);
960 return sfp_hwmon_tx_power(sfp, attr, value);
962 return sfp_hwmon_rx_power(sfp, attr, value);
971 static const struct hwmon_ops sfp_hwmon_ops = {
972 .is_visible = sfp_hwmon_is_visible,
973 .read = sfp_hwmon_read,
976 static u32 sfp_hwmon_chip_config[] = {
981 static const struct hwmon_channel_info sfp_hwmon_chip = {
983 .config = sfp_hwmon_chip_config,
986 static u32 sfp_hwmon_temp_config[] = {
988 HWMON_T_MAX | HWMON_T_MIN |
989 HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
990 HWMON_T_CRIT | HWMON_T_LCRIT |
991 HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM,
995 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
997 .config = sfp_hwmon_temp_config,
1000 static u32 sfp_hwmon_vcc_config[] = {
1002 HWMON_I_MAX | HWMON_I_MIN |
1003 HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1004 HWMON_I_CRIT | HWMON_I_LCRIT |
1005 HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM,
1009 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1011 .config = sfp_hwmon_vcc_config,
1014 static u32 sfp_hwmon_bias_config[] = {
1016 HWMON_C_MAX | HWMON_C_MIN |
1017 HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1018 HWMON_C_CRIT | HWMON_C_LCRIT |
1019 HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM,
1023 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1025 .config = sfp_hwmon_bias_config,
1028 static u32 sfp_hwmon_power_config[] = {
1029 /* Transmit power */
1031 HWMON_P_MAX | HWMON_P_MIN |
1032 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1033 HWMON_P_CRIT | HWMON_P_LCRIT |
1034 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1037 HWMON_P_MAX | HWMON_P_MIN |
1038 HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1039 HWMON_P_CRIT | HWMON_P_LCRIT |
1040 HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
1044 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1045 .type = hwmon_power,
1046 .config = sfp_hwmon_power_config,
1049 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1051 &sfp_hwmon_vcc_channel_info,
1052 &sfp_hwmon_temp_channel_info,
1053 &sfp_hwmon_bias_channel_info,
1054 &sfp_hwmon_power_channel_info,
1058 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1059 .ops = &sfp_hwmon_ops,
1060 .info = sfp_hwmon_info,
1063 static int sfp_hwmon_insert(struct sfp *sfp)
1067 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1070 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1073 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1074 /* This driver in general does not support address
1079 err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1083 sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1084 if (!sfp->hwmon_name)
1087 for (i = 0; sfp->hwmon_name[i]; i++)
1088 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1089 sfp->hwmon_name[i] = '_';
1091 sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1092 sfp->hwmon_name, sfp,
1093 &sfp_hwmon_chip_info,
1096 return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
1099 static void sfp_hwmon_remove(struct sfp *sfp)
1101 hwmon_device_unregister(sfp->hwmon_dev);
1102 kfree(sfp->hwmon_name);
1105 static int sfp_hwmon_insert(struct sfp *sfp)
1110 static void sfp_hwmon_remove(struct sfp *sfp)
1116 static void sfp_module_tx_disable(struct sfp *sfp)
1118 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1119 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1120 sfp->state |= SFP_F_TX_DISABLE;
1121 sfp_set_state(sfp, sfp->state);
1124 static void sfp_module_tx_enable(struct sfp *sfp)
1126 dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1127 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1128 sfp->state &= ~SFP_F_TX_DISABLE;
1129 sfp_set_state(sfp, sfp->state);
1132 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1134 unsigned int state = sfp->state;
1136 if (state & SFP_F_TX_DISABLE)
1139 sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1143 sfp_set_state(sfp, state);
1146 /* SFP state machine */
1147 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1150 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1153 cancel_delayed_work(&sfp->timeout);
1156 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1157 unsigned int timeout)
1159 sfp->sm_state = state;
1160 sfp_sm_set_timer(sfp, timeout);
1163 static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
1164 unsigned int timeout)
1166 sfp->sm_mod_state = state;
1167 sfp_sm_set_timer(sfp, timeout);
1170 static void sfp_sm_phy_detach(struct sfp *sfp)
1172 phy_stop(sfp->mod_phy);
1173 sfp_remove_phy(sfp->sfp_bus);
1174 phy_device_remove(sfp->mod_phy);
1175 phy_device_free(sfp->mod_phy);
1176 sfp->mod_phy = NULL;
1179 static void sfp_sm_probe_phy(struct sfp *sfp)
1181 struct phy_device *phy;
1184 msleep(T_PHY_RESET_MS);
1186 phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
1187 if (phy == ERR_PTR(-ENODEV)) {
1188 dev_info(sfp->dev, "no PHY detected\n");
1192 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1196 err = sfp_add_phy(sfp->sfp_bus, phy);
1198 phy_device_remove(phy);
1199 phy_device_free(phy);
1200 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1208 static void sfp_sm_link_up(struct sfp *sfp)
1210 sfp_link_up(sfp->sfp_bus);
1211 sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1214 static void sfp_sm_link_down(struct sfp *sfp)
1216 sfp_link_down(sfp->sfp_bus);
1219 static void sfp_sm_link_check_los(struct sfp *sfp)
1221 unsigned int los = sfp->state & SFP_F_LOS;
1223 /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1224 * are set, we assume that no LOS signal is available.
1226 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
1228 else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
1232 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1234 sfp_sm_link_up(sfp);
1237 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1239 return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1240 event == SFP_E_LOS_LOW) ||
1241 (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1242 event == SFP_E_LOS_HIGH);
1245 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1247 return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1248 event == SFP_E_LOS_HIGH) ||
1249 (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1250 event == SFP_E_LOS_LOW);
1253 static void sfp_sm_fault(struct sfp *sfp, bool warn)
1255 if (sfp->sm_retries && !--sfp->sm_retries) {
1257 "module persistently indicates fault, disabling\n");
1258 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1261 dev_err(sfp->dev, "module transmit fault indicated\n");
1263 sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
1267 static void sfp_sm_mod_init(struct sfp *sfp)
1269 sfp_module_tx_enable(sfp);
1271 /* Wait t_init before indicating that the link is up, provided the
1272 * current state indicates no TX_FAULT. If TX_FAULT clears before
1273 * this time, that's fine too.
1275 sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
1276 sfp->sm_retries = 5;
1278 /* Setting the serdes link mode is guesswork: there's no
1279 * field in the EEPROM which indicates what mode should
1282 * If it's a gigabit-only fiber module, it probably does
1283 * not have a PHY, so switch to 802.3z negotiation mode.
1284 * Otherwise, switch to SGMII mode (which is required to
1285 * support non-gigabit speeds) and probe for a PHY.
1287 if (sfp->id.base.e1000_base_t ||
1288 sfp->id.base.e100_base_lx ||
1289 sfp->id.base.e100_base_fx)
1290 sfp_sm_probe_phy(sfp);
1293 static int sfp_sm_mod_hpower(struct sfp *sfp)
1300 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1302 if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1305 if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
1306 (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
1308 /* The module appears not to implement bus address 0xa2,
1309 * or requires an address change sequence, so assume that
1310 * the module powers up in the indicated power mode.
1312 if (power > sfp->max_power_mW) {
1314 "Host does not support %u.%uW modules\n",
1315 power / 1000, (power / 100) % 10);
1321 if (power > sfp->max_power_mW) {
1323 "Host does not support %u.%uW modules, module left in power mode 1\n",
1324 power / 1000, (power / 100) % 10);
1331 err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1332 if (err != sizeof(val)) {
1333 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1340 err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1341 if (err != sizeof(val)) {
1342 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1347 dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1348 power / 1000, (power / 100) % 10);
1349 return T_HPOWER_LEVEL;
1355 static int sfp_sm_mod_probe(struct sfp *sfp)
1357 /* SFP module inserted - read I2C data */
1358 struct sfp_eeprom_id id;
1363 ret = sfp_read(sfp, false, 0, &id, sizeof(id));
1365 dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1369 if (ret != sizeof(id)) {
1370 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1374 /* Cotsworks do not seem to update the checksums when they
1375 * do the final programming with the final module part number,
1376 * serial number and date code.
1378 cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS ", 16);
1380 /* Validate the checksum over the base structure */
1381 check = sfp_check(&id.base, sizeof(id.base) - 1);
1382 if (check != id.base.cc_base) {
1385 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1386 check, id.base.cc_base);
1389 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1390 check, id.base.cc_base);
1391 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1392 16, 1, &id, sizeof(id), true);
1397 check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1398 if (check != id.ext.cc_ext) {
1401 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1402 check, id.ext.cc_ext);
1405 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1406 check, id.ext.cc_ext);
1407 print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1408 16, 1, &id, sizeof(id), true);
1409 memset(&id.ext, 0, sizeof(id.ext));
1415 dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1416 (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1417 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1418 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1419 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1420 (int)sizeof(id.ext.datecode), id.ext.datecode);
1422 /* Check whether we support this module */
1423 if (!sfp->type->module_supported(&sfp->id)) {
1425 "module is not supported - phys id 0x%02x 0x%02x\n",
1426 sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1430 /* If the module requires address swap mode, warn about it */
1431 if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1433 "module address swap to access page 0xA2 is not supported.\n");
1435 ret = sfp_hwmon_insert(sfp);
1439 ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
1443 return sfp_sm_mod_hpower(sfp);
1446 static void sfp_sm_mod_remove(struct sfp *sfp)
1448 sfp_module_remove(sfp->sfp_bus);
1450 sfp_hwmon_remove(sfp);
1453 sfp_sm_phy_detach(sfp);
1455 sfp_module_tx_disable(sfp);
1457 memset(&sfp->id, 0, sizeof(sfp->id));
1459 dev_info(sfp->dev, "module removed\n");
1462 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
1464 mutex_lock(&sfp->sm_mutex);
1466 dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
1467 mod_state_to_str(sfp->sm_mod_state),
1468 dev_state_to_str(sfp->sm_dev_state),
1469 sm_state_to_str(sfp->sm_state),
1470 event_to_str(event));
1472 /* This state machine tracks the insert/remove state of
1473 * the module, and handles probing the on-board EEPROM.
1475 switch (sfp->sm_mod_state) {
1477 if (event == SFP_E_INSERT) {
1478 sfp_module_tx_disable(sfp);
1479 sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
1484 if (event == SFP_E_REMOVE) {
1485 sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1486 } else if (event == SFP_E_TIMEOUT) {
1487 int val = sfp_sm_mod_probe(sfp);
1490 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1492 sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
1493 else if (val != -EAGAIN)
1494 sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
1496 sfp_sm_set_timer(sfp, T_PROBE_RETRY);
1500 case SFP_MOD_HPOWER:
1501 if (event == SFP_E_TIMEOUT) {
1502 sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
1506 case SFP_MOD_PRESENT:
1508 if (event == SFP_E_REMOVE) {
1509 sfp_sm_mod_remove(sfp);
1510 sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
1515 /* This state machine tracks the netdev up/down state */
1516 switch (sfp->sm_dev_state) {
1518 if (event == SFP_E_DEV_UP)
1519 sfp->sm_dev_state = SFP_DEV_UP;
1523 if (event == SFP_E_DEV_DOWN) {
1524 /* If the module has a PHY, avoid raising TX disable
1525 * as this resets the PHY. Otherwise, raise it to
1526 * turn the laser off.
1529 sfp_module_tx_disable(sfp);
1530 sfp->sm_dev_state = SFP_DEV_DOWN;
1535 /* Some events are global */
1536 if (sfp->sm_state != SFP_S_DOWN &&
1537 (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1538 sfp->sm_dev_state != SFP_DEV_UP)) {
1539 if (sfp->sm_state == SFP_S_LINK_UP &&
1540 sfp->sm_dev_state == SFP_DEV_UP)
1541 sfp_sm_link_down(sfp);
1543 sfp_sm_phy_detach(sfp);
1544 sfp_sm_next(sfp, SFP_S_DOWN, 0);
1545 mutex_unlock(&sfp->sm_mutex);
1549 /* The main state machine */
1550 switch (sfp->sm_state) {
1552 if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
1553 sfp->sm_dev_state == SFP_DEV_UP)
1554 sfp_sm_mod_init(sfp);
1558 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
1559 sfp_sm_fault(sfp, true);
1560 else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
1561 sfp_sm_link_check_los(sfp);
1564 case SFP_S_WAIT_LOS:
1565 if (event == SFP_E_TX_FAULT)
1566 sfp_sm_fault(sfp, true);
1567 else if (sfp_los_event_inactive(sfp, event))
1568 sfp_sm_link_up(sfp);
1572 if (event == SFP_E_TX_FAULT) {
1573 sfp_sm_link_down(sfp);
1574 sfp_sm_fault(sfp, true);
1575 } else if (sfp_los_event_active(sfp, event)) {
1576 sfp_sm_link_down(sfp);
1577 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1581 case SFP_S_TX_FAULT:
1582 if (event == SFP_E_TIMEOUT) {
1583 sfp_module_tx_fault_reset(sfp);
1584 sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
1589 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
1590 sfp_sm_fault(sfp, false);
1591 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
1592 dev_info(sfp->dev, "module transmit fault recovered\n");
1593 sfp_sm_link_check_los(sfp);
1597 case SFP_S_TX_DISABLE:
1601 dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
1602 mod_state_to_str(sfp->sm_mod_state),
1603 dev_state_to_str(sfp->sm_dev_state),
1604 sm_state_to_str(sfp->sm_state));
1606 mutex_unlock(&sfp->sm_mutex);
1609 static void sfp_start(struct sfp *sfp)
1611 sfp_sm_event(sfp, SFP_E_DEV_UP);
1614 static void sfp_stop(struct sfp *sfp)
1616 sfp_sm_event(sfp, SFP_E_DEV_DOWN);
1619 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
1621 /* locking... and check module is present */
1623 if (sfp->id.ext.sff8472_compliance &&
1624 !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
1625 modinfo->type = ETH_MODULE_SFF_8472;
1626 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
1628 modinfo->type = ETH_MODULE_SFF_8079;
1629 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
1634 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
1637 unsigned int first, last, len;
1644 last = ee->offset + ee->len;
1645 if (first < ETH_MODULE_SFF_8079_LEN) {
1646 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
1649 ret = sfp_read(sfp, false, first, data, len);
1656 if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
1657 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
1659 first -= ETH_MODULE_SFF_8079_LEN;
1661 ret = sfp_read(sfp, true, first, data, len);
1668 static const struct sfp_socket_ops sfp_module_ops = {
1671 .module_info = sfp_module_info,
1672 .module_eeprom = sfp_module_eeprom,
1675 static void sfp_timeout(struct work_struct *work)
1677 struct sfp *sfp = container_of(work, struct sfp, timeout.work);
1680 sfp_sm_event(sfp, SFP_E_TIMEOUT);
1684 static void sfp_check_state(struct sfp *sfp)
1686 unsigned int state, i, changed;
1688 state = sfp_get_state(sfp);
1689 changed = state ^ sfp->state;
1690 changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
1692 for (i = 0; i < GPIO_MAX; i++)
1693 if (changed & BIT(i))
1694 dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
1695 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
1697 state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
1701 if (changed & SFP_F_PRESENT)
1702 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
1703 SFP_E_INSERT : SFP_E_REMOVE);
1705 if (changed & SFP_F_TX_FAULT)
1706 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
1707 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
1709 if (changed & SFP_F_LOS)
1710 sfp_sm_event(sfp, state & SFP_F_LOS ?
1711 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
1715 static irqreturn_t sfp_irq(int irq, void *data)
1717 struct sfp *sfp = data;
1719 sfp_check_state(sfp);
1724 static void sfp_poll(struct work_struct *work)
1726 struct sfp *sfp = container_of(work, struct sfp, poll.work);
1728 sfp_check_state(sfp);
1729 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1732 static struct sfp *sfp_alloc(struct device *dev)
1736 sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
1738 return ERR_PTR(-ENOMEM);
1742 mutex_init(&sfp->sm_mutex);
1743 INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
1744 INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
1749 static void sfp_cleanup(void *data)
1751 struct sfp *sfp = data;
1753 cancel_delayed_work_sync(&sfp->poll);
1754 cancel_delayed_work_sync(&sfp->timeout);
1756 mdiobus_unregister(sfp->i2c_mii);
1757 mdiobus_free(sfp->i2c_mii);
1760 i2c_put_adapter(sfp->i2c);
1764 static int sfp_probe(struct platform_device *pdev)
1766 const struct sff_data *sff;
1771 sfp = sfp_alloc(&pdev->dev);
1773 return PTR_ERR(sfp);
1775 platform_set_drvdata(pdev, sfp);
1777 err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
1781 sff = sfp->type = &sfp_data;
1783 if (pdev->dev.of_node) {
1784 struct device_node *node = pdev->dev.of_node;
1785 const struct of_device_id *id;
1786 struct i2c_adapter *i2c;
1787 struct device_node *np;
1789 id = of_match_node(sfp_of_match, node);
1793 sff = sfp->type = id->data;
1795 np = of_parse_phandle(node, "i2c-bus", 0);
1797 dev_err(sfp->dev, "missing 'i2c-bus' property\n");
1801 i2c = of_find_i2c_adapter_by_node(np);
1804 return -EPROBE_DEFER;
1806 err = sfp_i2c_configure(sfp, i2c);
1808 i2c_put_adapter(i2c);
1813 for (i = 0; i < GPIO_MAX; i++)
1814 if (sff->gpios & BIT(i)) {
1815 sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
1816 gpio_of_names[i], gpio_flags[i]);
1817 if (IS_ERR(sfp->gpio[i]))
1818 return PTR_ERR(sfp->gpio[i]);
1821 sfp->get_state = sfp_gpio_get_state;
1822 sfp->set_state = sfp_gpio_set_state;
1824 /* Modules that have no detect signal are always present */
1825 if (!(sfp->gpio[GPIO_MODDEF0]))
1826 sfp->get_state = sff_gpio_get_state;
1828 device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
1829 &sfp->max_power_mW);
1830 if (!sfp->max_power_mW)
1831 sfp->max_power_mW = 1000;
1833 dev_info(sfp->dev, "Host maximum power %u.%uW\n",
1834 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
1836 sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
1840 /* Get the initial state, and always signal TX disable,
1841 * since the network interface will not be up.
1843 sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
1845 if (sfp->gpio[GPIO_RATE_SELECT] &&
1846 gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
1847 sfp->state |= SFP_F_RATE_SELECT;
1848 sfp_set_state(sfp, sfp->state);
1849 sfp_module_tx_disable(sfp);
1851 if (sfp->state & SFP_F_PRESENT)
1852 sfp_sm_event(sfp, SFP_E_INSERT);
1855 for (i = 0; i < GPIO_MAX; i++) {
1856 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
1859 irq = gpiod_to_irq(sfp->gpio[i]);
1865 err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq,
1867 IRQF_TRIGGER_RISING |
1868 IRQF_TRIGGER_FALLING,
1869 dev_name(sfp->dev), sfp);
1875 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
1877 /* We could have an issue in cases no Tx disable pin is available or
1878 * wired as modules using a laser as their light source will continue to
1879 * be active when the fiber is removed. This could be a safety issue and
1880 * we should at least warn the user about that.
1882 if (!sfp->gpio[GPIO_TX_DISABLE])
1884 "No tx_disable pin: SFP modules will always be emitting.\n");
1889 static int sfp_remove(struct platform_device *pdev)
1891 struct sfp *sfp = platform_get_drvdata(pdev);
1893 sfp_unregister_socket(sfp->sfp_bus);
1898 static struct platform_driver sfp_driver = {
1900 .remove = sfp_remove,
1903 .of_match_table = sfp_of_match,
1907 static int sfp_init(void)
1909 poll_jiffies = msecs_to_jiffies(100);
1911 return platform_driver_register(&sfp_driver);
1913 module_init(sfp_init);
1915 static void sfp_exit(void)
1917 platform_driver_unregister(&sfp_driver);
1919 module_exit(sfp_exit);
1921 MODULE_ALIAS("platform:sfp");
1922 MODULE_AUTHOR("Russell King");
1923 MODULE_LICENSE("GPL v2");