Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1957 insertions, 0 deletions

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
new file mode 100644
index 000000000..71bafc8f5
--- /dev/null
+++ b/drivers/net/phy/sfp.c
@@ -0,0 +1,1957 @@
+#include <linux/ctype.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/hwmon.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include "mdio-i2c.h"
+#include "sfp.h"
+#include "swphy.h"
+
+enum {
+	GPIO_MODDEF0,
+	GPIO_LOS,
+	GPIO_TX_FAULT,
+	GPIO_TX_DISABLE,
+	GPIO_RATE_SELECT,
+	GPIO_MAX,
+
+	SFP_F_PRESENT = BIT(GPIO_MODDEF0),
+	SFP_F_LOS = BIT(GPIO_LOS),
+	SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
+	SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
+	SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
+
+	SFP_E_INSERT = 0,
+	SFP_E_REMOVE,
+	SFP_E_DEV_DOWN,
+	SFP_E_DEV_UP,
+	SFP_E_TX_FAULT,
+	SFP_E_TX_CLEAR,
+	SFP_E_LOS_HIGH,
+	SFP_E_LOS_LOW,
+	SFP_E_TIMEOUT,
+
+	SFP_MOD_EMPTY = 0,
+	SFP_MOD_PROBE,
+	SFP_MOD_HPOWER,
+	SFP_MOD_PRESENT,
+	SFP_MOD_ERROR,
+
+	SFP_DEV_DOWN = 0,
+	SFP_DEV_UP,
+
+	SFP_S_DOWN = 0,
+	SFP_S_INIT,
+	SFP_S_WAIT_LOS,
+	SFP_S_LINK_UP,
+	SFP_S_TX_FAULT,
+	SFP_S_REINIT,
+	SFP_S_TX_DISABLE,
+};
+
+static const char  * const mod_state_strings[] = {
+	[SFP_MOD_EMPTY] = "empty",
+	[SFP_MOD_PROBE] = "probe",
+	[SFP_MOD_HPOWER] = "hpower",
+	[SFP_MOD_PRESENT] = "present",
+	[SFP_MOD_ERROR] = "error",
+};
+
+static const char *mod_state_to_str(unsigned short mod_state)
+{
+	if (mod_state >= ARRAY_SIZE(mod_state_strings))
+		return "Unknown module state";
+	return mod_state_strings[mod_state];
+}
+
+static const char * const dev_state_strings[] = {
+	[SFP_DEV_DOWN] = "down",
+	[SFP_DEV_UP] = "up",
+};
+
+static const char *dev_state_to_str(unsigned short dev_state)
+{
+	if (dev_state >= ARRAY_SIZE(dev_state_strings))
+		return "Unknown device state";
+	return dev_state_strings[dev_state];
+}
+
+static const char * const event_strings[] = {
+	[SFP_E_INSERT] = "insert",
+	[SFP_E_REMOVE] = "remove",
+	[SFP_E_DEV_DOWN] = "dev_down",
+	[SFP_E_DEV_UP] = "dev_up",
+	[SFP_E_TX_FAULT] = "tx_fault",
+	[SFP_E_TX_CLEAR] = "tx_clear",
+	[SFP_E_LOS_HIGH] = "los_high",
+	[SFP_E_LOS_LOW] = "los_low",
+	[SFP_E_TIMEOUT] = "timeout",
+};
+
+static const char *event_to_str(unsigned short event)
+{
+	if (event >= ARRAY_SIZE(event_strings))
+		return "Unknown event";
+	return event_strings[event];
+}
+
+static const char * const sm_state_strings[] = {
+	[SFP_S_DOWN] = "down",
+	[SFP_S_INIT] = "init",
+	[SFP_S_WAIT_LOS] = "wait_los",
+	[SFP_S_LINK_UP] = "link_up",
+	[SFP_S_TX_FAULT] = "tx_fault",
+	[SFP_S_REINIT] = "reinit",
+	[SFP_S_TX_DISABLE] = "tx_disable",
+};
+
+static const char *sm_state_to_str(unsigned short sm_state)
+{
+	if (sm_state >= ARRAY_SIZE(sm_state_strings))
+		return "Unknown state";
+	return sm_state_strings[sm_state];
+}
+
+static const char *gpio_of_names[] = {
+	"mod-def0",
+	"los",
+	"tx-fault",
+	"tx-disable",
+	"rate-select0",
+};
+
+static const enum gpiod_flags gpio_flags[] = {
+	GPIOD_IN,
+	GPIOD_IN,
+	GPIOD_IN,
+	GPIOD_ASIS,
+	GPIOD_ASIS,
+};
+
+#define T_INIT_JIFFIES	msecs_to_jiffies(300)
+#define T_RESET_US	10
+#define T_FAULT_RECOVER	msecs_to_jiffies(1000)
+
+/* SFP module presence detection is poor: the three MOD DEF signals are
+ * the same length on the PCB, which means it's possible for MOD DEF 0 to
+ * connect before the I2C bus on MOD DEF 1/2.
+ *
+ * The SFP MSA specifies 300ms as t_init (the time taken for TX_FAULT to
+ * be deasserted) but makes no mention of the earliest time before we can
+ * access the I2C EEPROM.  However, Avago modules require 300ms.
+ */
+#define T_PROBE_INIT	msecs_to_jiffies(300)
+#define T_HPOWER_LEVEL	msecs_to_jiffies(300)
+#define T_PROBE_RETRY	msecs_to_jiffies(100)
+
+/* SFP modules appear to always have their PHY configured for bus address
+ * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
+ */
+#define SFP_PHY_ADDR	22
+
+/* Give this long for the PHY to reset. */
+#define T_PHY_RESET_MS	50
+
+struct sff_data {
+	unsigned int gpios;
+	bool (*module_supported)(const struct sfp_eeprom_id *id);
+};
+
+struct sfp {
+	struct device *dev;
+	struct i2c_adapter *i2c;
+	struct mii_bus *i2c_mii;
+	struct sfp_bus *sfp_bus;
+	struct phy_device *mod_phy;
+	const struct sff_data *type;
+	u32 max_power_mW;
+
+	unsigned int (*get_state)(struct sfp *);
+	void (*set_state)(struct sfp *, unsigned int);
+	int (*read)(struct sfp *, bool, u8, void *, size_t);
+	int (*write)(struct sfp *, bool, u8, void *, size_t);
+
+	struct gpio_desc *gpio[GPIO_MAX];
+
+	bool attached;
+	struct mutex st_mutex;			/* Protects state */
+	unsigned int state;
+	struct delayed_work poll;
+	struct delayed_work timeout;
+	struct mutex sm_mutex;			/* Protects state machine */
+	unsigned char sm_mod_state;
+	unsigned char sm_dev_state;
+	unsigned short sm_state;
+	unsigned int sm_retries;
+
+	struct sfp_eeprom_id id;
+#if IS_ENABLED(CONFIG_HWMON)
+	struct sfp_diag diag;
+	struct device *hwmon_dev;
+	char *hwmon_name;
+#endif
+
+};
+
+static bool sff_module_supported(const struct sfp_eeprom_id *id)
+{
+	return id->base.phys_id == SFP_PHYS_ID_SFF &&
+	       id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
+}
+
+static const struct sff_data sff_data = {
+	.gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
+	.module_supported = sff_module_supported,
+};
+
+static bool sfp_module_supported(const struct sfp_eeprom_id *id)
+{
+	return id->base.phys_id == SFP_PHYS_ID_SFP &&
+	       id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
+}
+
+static const struct sff_data sfp_data = {
+	.gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
+		 SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
+	.module_supported = sfp_module_supported,
+};
+
+static const struct of_device_id sfp_of_match[] = {
+	{ .compatible = "sff,sff", .data = &sff_data, },
+	{ .compatible = "sff,sfp", .data = &sfp_data, },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, sfp_of_match);
+
+static unsigned long poll_jiffies;
+
+static unsigned int sfp_gpio_get_state(struct sfp *sfp)
+{
+	unsigned int i, state, v;
+
+	for (i = state = 0; i < GPIO_MAX; i++) {
+		if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
+			continue;
+
+		v = gpiod_get_value_cansleep(sfp->gpio[i]);
+		if (v)
+			state |= BIT(i);
+	}
+
+	return state;
+}
+
+static unsigned int sff_gpio_get_state(struct sfp *sfp)
+{
+	return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
+}
+
+static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
+{
+	if (state & SFP_F_PRESENT) {
+		/* If the module is present, drive the signals */
+		if (sfp->gpio[GPIO_TX_DISABLE])
+			gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
+					       state & SFP_F_TX_DISABLE);
+		if (state & SFP_F_RATE_SELECT)
+			gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
+					       state & SFP_F_RATE_SELECT);
+	} else {
+		/* Otherwise, let them float to the pull-ups */
+		if (sfp->gpio[GPIO_TX_DISABLE])
+			gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
+		if (state & SFP_F_RATE_SELECT)
+			gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
+	}
+}
+
+static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
+			size_t len)
+{
+	struct i2c_msg msgs[2];
+	u8 bus_addr = a2 ? 0x51 : 0x50;
+	size_t this_len;
+	int ret;
+
+	msgs[0].addr = bus_addr;
+	msgs[0].flags = 0;
+	msgs[0].len = 1;
+	msgs[0].buf = &dev_addr;
+	msgs[1].addr = bus_addr;
+	msgs[1].flags = I2C_M_RD;
+	msgs[1].len = len;
+	msgs[1].buf = buf;
+
+	while (len) {
+		this_len = len;
+		if (this_len > 16)
+			this_len = 16;
+
+		msgs[1].len = this_len;
+
+		ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
+		if (ret < 0)
+			return ret;
+
+		if (ret != ARRAY_SIZE(msgs))
+			break;
+
+		msgs[1].buf += this_len;
+		dev_addr += this_len;
+		len -= this_len;
+	}
+
+	return msgs[1].buf - (u8 *)buf;
+}
+
+static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
+	size_t len)
+{
+	struct i2c_msg msgs[1];
+	u8 bus_addr = a2 ? 0x51 : 0x50;
+	int ret;
+
+	msgs[0].addr = bus_addr;
+	msgs[0].flags = 0;
+	msgs[0].len = 1 + len;
+	msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
+	if (!msgs[0].buf)
+		return -ENOMEM;
+
+	msgs[0].buf[0] = dev_addr;
+	memcpy(&msgs[0].buf[1], buf, len);
+
+	ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
+
+	kfree(msgs[0].buf);
+
+	if (ret < 0)
+		return ret;
+
+	return ret == ARRAY_SIZE(msgs) ? len : 0;
+}
+
+static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
+{
+	struct mii_bus *i2c_mii;
+	int ret;
+
+	if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
+		return -EINVAL;
+
+	sfp->i2c = i2c;
+	sfp->read = sfp_i2c_read;
+	sfp->write = sfp_i2c_write;
+
+	i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
+	if (IS_ERR(i2c_mii))
+		return PTR_ERR(i2c_mii);
+
+	i2c_mii->name = "SFP I2C Bus";
+	i2c_mii->phy_mask = ~0;
+
+	ret = mdiobus_register(i2c_mii);
+	if (ret < 0) {
+		mdiobus_free(i2c_mii);
+		return ret;
+	}
+
+	sfp->i2c_mii = i2c_mii;
+
+	return 0;
+}
+
+/* Interface */
+static unsigned int sfp_get_state(struct sfp *sfp)
+{
+	return sfp->get_state(sfp);
+}
+
+static void sfp_set_state(struct sfp *sfp, unsigned int state)
+{
+	sfp->set_state(sfp, state);
+}
+
+static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
+{
+	return sfp->read(sfp, a2, addr, buf, len);
+}
+
+static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
+{
+	return sfp->write(sfp, a2, addr, buf, len);
+}
+
+static unsigned int sfp_check(void *buf, size_t len)
+{
+	u8 *p, check;
+
+	for (p = buf, check = 0; len; p++, len--)
+		check += *p;
+
+	return check;
+}
+
+/* hwmon */
+#if IS_ENABLED(CONFIG_HWMON)
+static umode_t sfp_hwmon_is_visible(const void *data,
+				    enum hwmon_sensor_types type,
+				    u32 attr, int channel)
+{
+	const struct sfp *sfp = data;
+
+	switch (type) {
+	case hwmon_temp:
+		switch (attr) {
+		case hwmon_temp_min_alarm:
+		case hwmon_temp_max_alarm:
+		case hwmon_temp_lcrit_alarm:
+		case hwmon_temp_crit_alarm:
+		case hwmon_temp_min:
+		case hwmon_temp_max:
+		case hwmon_temp_lcrit:
+		case hwmon_temp_crit:
+			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+				return 0;
+			/* fall through */
+		case hwmon_temp_input:
+			return 0444;
+		default:
+			return 0;
+		}
+	case hwmon_in:
+		switch (attr) {
+		case hwmon_in_min_alarm:
+		case hwmon_in_max_alarm:
+		case hwmon_in_lcrit_alarm:
+		case hwmon_in_crit_alarm:
+		case hwmon_in_min:
+		case hwmon_in_max:
+		case hwmon_in_lcrit:
+		case hwmon_in_crit:
+			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+				return 0;
+			/* fall through */
+		case hwmon_in_input:
+			return 0444;
+		default:
+			return 0;
+		}
+	case hwmon_curr:
+		switch (attr) {
+		case hwmon_curr_min_alarm:
+		case hwmon_curr_max_alarm:
+		case hwmon_curr_lcrit_alarm:
+		case hwmon_curr_crit_alarm:
+		case hwmon_curr_min:
+		case hwmon_curr_max:
+		case hwmon_curr_lcrit:
+		case hwmon_curr_crit:
+			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+				return 0;
+			/* fall through */
+		case hwmon_curr_input:
+			return 0444;
+		default:
+			return 0;
+		}
+	case hwmon_power:
+		/* External calibration of receive power requires
+		 * floating point arithmetic. Doing that in the kernel
+		 * is not easy, so just skip it. If the module does
+		 * not require external calibration, we can however
+		 * show receiver power, since FP is then not needed.
+		 */
+		if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
+		    channel == 1)
+			return 0;
+		switch (attr) {
+		case hwmon_power_min_alarm:
+		case hwmon_power_max_alarm:
+		case hwmon_power_lcrit_alarm:
+		case hwmon_power_crit_alarm:
+		case hwmon_power_min:
+		case hwmon_power_max:
+		case hwmon_power_lcrit:
+		case hwmon_power_crit:
+			if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+				return 0;
+			/* fall through */
+		case hwmon_power_input:
+			return 0444;
+		default:
+			return 0;
+		}
+	default:
+		return 0;
+	}
+}
+
+static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
+{
+	__be16 val;
+	int err;
+
+	err = sfp_read(sfp, true, reg, &val, sizeof(val));
+	if (err < 0)
+		return err;
+
+	*value = be16_to_cpu(val);
+
+	return 0;
+}
+
+static void sfp_hwmon_to_rx_power(long *value)
+{
+	*value = DIV_ROUND_CLOSEST(*value, 10);
+}
+
+static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
+				long *value)
+{
+	if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
+		*value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
+}
+
+static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
+{
+	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
+			    be16_to_cpu(sfp->diag.cal_t_offset), value);
+
+	if (*value >= 0x8000)
+		*value -= 0x10000;
+
+	*value = DIV_ROUND_CLOSEST(*value * 1000, 256);
+}
+
+static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
+{
+	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
+			    be16_to_cpu(sfp->diag.cal_v_offset), value);
+
+	*value = DIV_ROUND_CLOSEST(*value, 10);
+}
+
+static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
+{
+	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
+			    be16_to_cpu(sfp->diag.cal_txi_offset), value);
+
+	*value = DIV_ROUND_CLOSEST(*value, 500);
+}
+
+static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
+{
+	sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
+			    be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
+
+	*value = DIV_ROUND_CLOSEST(*value, 10);
+}
+
+static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
+{
+	int err;
+
+	err = sfp_hwmon_read_sensor(sfp, reg, value);
+	if (err < 0)
+		return err;
+
+	sfp_hwmon_calibrate_temp(sfp, value);
+
+	return 0;
+}
+
+static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
+{
+	int err;
+
+	err = sfp_hwmon_read_sensor(sfp, reg, value);
+	if (err < 0)
+		return err;
+
+	sfp_hwmon_calibrate_vcc(sfp, value);
+
+	return 0;
+}
+
+static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
+{
+	int err;
+
+	err = sfp_hwmon_read_sensor(sfp, reg, value);
+	if (err < 0)
+		return err;
+
+	sfp_hwmon_calibrate_bias(sfp, value);
+
+	return 0;
+}
+
+static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
+{
+	int err;
+
+	err = sfp_hwmon_read_sensor(sfp, reg, value);
+	if (err < 0)
+		return err;
+
+	sfp_hwmon_calibrate_tx_power(sfp, value);
+
+	return 0;
+}
+
+static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
+{
+	int err;
+
+	err = sfp_hwmon_read_sensor(sfp, reg, value);
+	if (err < 0)
+		return err;
+
+	sfp_hwmon_to_rx_power(value);
+
+	return 0;
+}
+
+static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
+{
+	u8 status;
+	int err;
+
+	switch (attr) {
+	case hwmon_temp_input:
+		return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
+
+	case hwmon_temp_lcrit:
+		*value = be16_to_cpu(sfp->diag.temp_low_alarm);
+		sfp_hwmon_calibrate_temp(sfp, value);
+		return 0;
+
+	case hwmon_temp_min:
+		*value = be16_to_cpu(sfp->diag.temp_low_warn);
+		sfp_hwmon_calibrate_temp(sfp, value);
+		return 0;
+	case hwmon_temp_max:
+		*value = be16_to_cpu(sfp->diag.temp_high_warn);
+		sfp_hwmon_calibrate_temp(sfp, value);
+		return 0;
+
+	case hwmon_temp_crit:
+		*value = be16_to_cpu(sfp->diag.temp_high_alarm);
+		sfp_hwmon_calibrate_temp(sfp, value);
+		return 0;
+
+	case hwmon_temp_lcrit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_TEMP_LOW);
+		return 0;
+
+	case hwmon_temp_min_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_TEMP_LOW);
+		return 0;
+
+	case hwmon_temp_max_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_TEMP_HIGH);
+		return 0;
+
+	case hwmon_temp_crit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_TEMP_HIGH);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
+{
+	u8 status;
+	int err;
+
+	switch (attr) {
+	case hwmon_in_input:
+		return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
+
+	case hwmon_in_lcrit:
+		*value = be16_to_cpu(sfp->diag.volt_low_alarm);
+		sfp_hwmon_calibrate_vcc(sfp, value);
+		return 0;
+
+	case hwmon_in_min:
+		*value = be16_to_cpu(sfp->diag.volt_low_warn);
+		sfp_hwmon_calibrate_vcc(sfp, value);
+		return 0;
+
+	case hwmon_in_max:
+		*value = be16_to_cpu(sfp->diag.volt_high_warn);
+		sfp_hwmon_calibrate_vcc(sfp, value);
+		return 0;
+
+	case hwmon_in_crit:
+		*value = be16_to_cpu(sfp->diag.volt_high_alarm);
+		sfp_hwmon_calibrate_vcc(sfp, value);
+		return 0;
+
+	case hwmon_in_lcrit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_VCC_LOW);
+		return 0;
+
+	case hwmon_in_min_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_VCC_LOW);
+		return 0;
+
+	case hwmon_in_max_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_VCC_HIGH);
+		return 0;
+
+	case hwmon_in_crit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_VCC_HIGH);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
+{
+	u8 status;
+	int err;
+
+	switch (attr) {
+	case hwmon_curr_input:
+		return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
+
+	case hwmon_curr_lcrit:
+		*value = be16_to_cpu(sfp->diag.bias_low_alarm);
+		sfp_hwmon_calibrate_bias(sfp, value);
+		return 0;
+
+	case hwmon_curr_min:
+		*value = be16_to_cpu(sfp->diag.bias_low_warn);
+		sfp_hwmon_calibrate_bias(sfp, value);
+		return 0;
+
+	case hwmon_curr_max:
+		*value = be16_to_cpu(sfp->diag.bias_high_warn);
+		sfp_hwmon_calibrate_bias(sfp, value);
+		return 0;
+
+	case hwmon_curr_crit:
+		*value = be16_to_cpu(sfp->diag.bias_high_alarm);
+		sfp_hwmon_calibrate_bias(sfp, value);
+		return 0;
+
+	case hwmon_curr_lcrit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
+		return 0;
+
+	case hwmon_curr_min_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_TX_BIAS_LOW);
+		return 0;
+
+	case hwmon_curr_max_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
+		return 0;
+
+	case hwmon_curr_crit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
+{
+	u8 status;
+	int err;
+
+	switch (attr) {
+	case hwmon_power_input:
+		return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
+
+	case hwmon_power_lcrit:
+		*value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
+		sfp_hwmon_calibrate_tx_power(sfp, value);
+		return 0;
+
+	case hwmon_power_min:
+		*value = be16_to_cpu(sfp->diag.txpwr_low_warn);
+		sfp_hwmon_calibrate_tx_power(sfp, value);
+		return 0;
+
+	case hwmon_power_max:
+		*value = be16_to_cpu(sfp->diag.txpwr_high_warn);
+		sfp_hwmon_calibrate_tx_power(sfp, value);
+		return 0;
+
+	case hwmon_power_crit:
+		*value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
+		sfp_hwmon_calibrate_tx_power(sfp, value);
+		return 0;
+
+	case hwmon_power_lcrit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_TXPWR_LOW);
+		return 0;
+
+	case hwmon_power_min_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_TXPWR_LOW);
+		return 0;
+
+	case hwmon_power_max_alarm:
+		err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN0_TXPWR_HIGH);
+		return 0;
+
+	case hwmon_power_crit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM0_TXPWR_HIGH);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
+{
+	u8 status;
+	int err;
+
+	switch (attr) {
+	case hwmon_power_input:
+		return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
+
+	case hwmon_power_lcrit:
+		*value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
+		sfp_hwmon_to_rx_power(value);
+		return 0;
+
+	case hwmon_power_min:
+		*value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
+		sfp_hwmon_to_rx_power(value);
+		return 0;
+
+	case hwmon_power_max:
+		*value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
+		sfp_hwmon_to_rx_power(value);
+		return 0;
+
+	case hwmon_power_crit:
+		*value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
+		sfp_hwmon_to_rx_power(value);
+		return 0;
+
+	case hwmon_power_lcrit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM1_RXPWR_LOW);
+		return 0;
+
+	case hwmon_power_min_alarm:
+		err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN1_RXPWR_LOW);
+		return 0;
+
+	case hwmon_power_max_alarm:
+		err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_WARN1_RXPWR_HIGH);
+		return 0;
+
+	case hwmon_power_crit_alarm:
+		err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
+		if (err < 0)
+			return err;
+
+		*value = !!(status & SFP_ALARM1_RXPWR_HIGH);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+			  u32 attr, int channel, long *value)
+{
+	struct sfp *sfp = dev_get_drvdata(dev);
+
+	switch (type) {
+	case hwmon_temp:
+		return sfp_hwmon_temp(sfp, attr, value);
+	case hwmon_in:
+		return sfp_hwmon_vcc(sfp, attr, value);
+	case hwmon_curr:
+		return sfp_hwmon_bias(sfp, attr, value);
+	case hwmon_power:
+		switch (channel) {
+		case 0:
+			return sfp_hwmon_tx_power(sfp, attr, value);
+		case 1:
+			return sfp_hwmon_rx_power(sfp, attr, value);
+		default:
+			return -EOPNOTSUPP;
+		}
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const struct hwmon_ops sfp_hwmon_ops = {
+	.is_visible = sfp_hwmon_is_visible,
+	.read = sfp_hwmon_read,
+};
+
+static u32 sfp_hwmon_chip_config[] = {
+	HWMON_C_REGISTER_TZ,
+	0,
+};
+
+static const struct hwmon_channel_info sfp_hwmon_chip = {
+	.type = hwmon_chip,
+	.config = sfp_hwmon_chip_config,
+};
+
+static u32 sfp_hwmon_temp_config[] = {
+	HWMON_T_INPUT |
+	HWMON_T_MAX | HWMON_T_MIN |
+	HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
+	HWMON_T_CRIT | HWMON_T_LCRIT |
+	HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM,
+	0,
+};
+
+static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
+	.type = hwmon_temp,
+	.config = sfp_hwmon_temp_config,
+};
+
+static u32 sfp_hwmon_vcc_config[] = {
+	HWMON_I_INPUT |
+	HWMON_I_MAX | HWMON_I_MIN |
+	HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
+	HWMON_I_CRIT | HWMON_I_LCRIT |
+	HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM,
+	0,
+};
+
+static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
+	.type = hwmon_in,
+	.config = sfp_hwmon_vcc_config,
+};
+
+static u32 sfp_hwmon_bias_config[] = {
+	HWMON_C_INPUT |
+	HWMON_C_MAX | HWMON_C_MIN |
+	HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
+	HWMON_C_CRIT | HWMON_C_LCRIT |
+	HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM,
+	0,
+};
+
+static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
+	.type = hwmon_curr,
+	.config = sfp_hwmon_bias_config,
+};
+
+static u32 sfp_hwmon_power_config[] = {
+	/* Transmit power */
+	HWMON_P_INPUT |
+	HWMON_P_MAX | HWMON_P_MIN |
+	HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
+	HWMON_P_CRIT | HWMON_P_LCRIT |
+	HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
+	/* Receive power */
+	HWMON_P_INPUT |
+	HWMON_P_MAX | HWMON_P_MIN |
+	HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
+	HWMON_P_CRIT | HWMON_P_LCRIT |
+	HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM,
+	0,
+};
+
+static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
+	.type = hwmon_power,
+	.config = sfp_hwmon_power_config,
+};
+
+static const struct hwmon_channel_info *sfp_hwmon_info[] = {
+	&sfp_hwmon_chip,
+	&sfp_hwmon_vcc_channel_info,
+	&sfp_hwmon_temp_channel_info,
+	&sfp_hwmon_bias_channel_info,
+	&sfp_hwmon_power_channel_info,
+	NULL,
+};
+
+static const struct hwmon_chip_info sfp_hwmon_chip_info = {
+	.ops = &sfp_hwmon_ops,
+	.info = sfp_hwmon_info,
+};
+
+static int sfp_hwmon_insert(struct sfp *sfp)
+{
+	int err, i;
+
+	if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
+		return 0;
+
+	if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
+		return 0;
+
+	if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
+		/* This driver in general does not support address
+		 * change.
+		 */
+		return 0;
+
+	err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
+	if (err < 0)
+		return err;
+
+	sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
+	if (!sfp->hwmon_name)
+		return -ENODEV;
+
+	for (i = 0; sfp->hwmon_name[i]; i++)
+		if (hwmon_is_bad_char(sfp->hwmon_name[i]))
+			sfp->hwmon_name[i] = '_';
+
+	sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
+							 sfp->hwmon_name, sfp,
+							 &sfp_hwmon_chip_info,
+							 NULL);
+
+	return PTR_ERR_OR_ZERO(sfp->hwmon_dev);
+}
+
+static void sfp_hwmon_remove(struct sfp *sfp)
+{
+	if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
+		hwmon_device_unregister(sfp->hwmon_dev);
+		sfp->hwmon_dev = NULL;
+		kfree(sfp->hwmon_name);
+	}
+}
+#else
+static int sfp_hwmon_insert(struct sfp *sfp)
+{
+	return 0;
+}
+
+static void sfp_hwmon_remove(struct sfp *sfp)
+{
+}
+#endif
+
+/* Helpers */
+static void sfp_module_tx_disable(struct sfp *sfp)
+{
+	dev_dbg(sfp->dev, "tx disable %u -> %u\n",
+		sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
+	sfp->state |= SFP_F_TX_DISABLE;
+	sfp_set_state(sfp, sfp->state);
+}
+
+static void sfp_module_tx_enable(struct sfp *sfp)
+{
+	dev_dbg(sfp->dev, "tx disable %u -> %u\n",
+		sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
+	sfp->state &= ~SFP_F_TX_DISABLE;
+	sfp_set_state(sfp, sfp->state);
+}
+
+static void sfp_module_tx_fault_reset(struct sfp *sfp)
+{
+	unsigned int state = sfp->state;
+
+	if (state & SFP_F_TX_DISABLE)
+		return;
+
+	sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
+
+	udelay(T_RESET_US);
+
+	sfp_set_state(sfp, state);
+}
+
+/* SFP state machine */
+static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
+{
+	if (timeout)
+		mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
+				 timeout);
+	else
+		cancel_delayed_work(&sfp->timeout);
+}
+
+static void sfp_sm_next(struct sfp *sfp, unsigned int state,
+			unsigned int timeout)
+{
+	sfp->sm_state = state;
+	sfp_sm_set_timer(sfp, timeout);
+}
+
+static void sfp_sm_ins_next(struct sfp *sfp, unsigned int state,
+			    unsigned int timeout)
+{
+	sfp->sm_mod_state = state;
+	sfp_sm_set_timer(sfp, timeout);
+}
+
+static void sfp_sm_phy_detach(struct sfp *sfp)
+{
+	phy_stop(sfp->mod_phy);
+	sfp_remove_phy(sfp->sfp_bus);
+	phy_device_remove(sfp->mod_phy);
+	phy_device_free(sfp->mod_phy);
+	sfp->mod_phy = NULL;
+}
+
+static void sfp_sm_probe_phy(struct sfp *sfp)
+{
+	struct phy_device *phy;
+	int err;
+
+	msleep(T_PHY_RESET_MS);
+
+	phy = mdiobus_scan(sfp->i2c_mii, SFP_PHY_ADDR);
+	if (phy == ERR_PTR(-ENODEV)) {
+		dev_info(sfp->dev, "no PHY detected\n");
+		return;
+	}
+	if (IS_ERR(phy)) {
+		dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
+		return;
+	}
+
+	err = sfp_add_phy(sfp->sfp_bus, phy);
+	if (err) {
+		phy_device_remove(phy);
+		phy_device_free(phy);
+		dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
+		return;
+	}
+
+	sfp->mod_phy = phy;
+	phy_start(phy);
+}
+
+static void sfp_sm_link_up(struct sfp *sfp)
+{
+	sfp_link_up(sfp->sfp_bus);
+	sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
+}
+
+static void sfp_sm_link_down(struct sfp *sfp)
+{
+	sfp_link_down(sfp->sfp_bus);
+}
+
+static void sfp_sm_link_check_los(struct sfp *sfp)
+{
+	unsigned int los = sfp->state & SFP_F_LOS;
+
+	/* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
+	 * are set, we assume that no LOS signal is available.
+	 */
+	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
+		los ^= SFP_F_LOS;
+	else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
+		los = 0;
+
+	if (los)
+		sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
+	else
+		sfp_sm_link_up(sfp);
+}
+
+static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
+{
+	return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
+		event == SFP_E_LOS_LOW) ||
+	       (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
+		event == SFP_E_LOS_HIGH);
+}
+
+static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
+{
+	return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
+		event == SFP_E_LOS_HIGH) ||
+	       (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
+		event == SFP_E_LOS_LOW);
+}
+
+static void sfp_sm_fault(struct sfp *sfp, bool warn)
+{
+	if (sfp->sm_retries && !--sfp->sm_retries) {
+		dev_err(sfp->dev,
+			"module persistently indicates fault, disabling\n");
+		sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
+	} else {
+		if (warn)
+			dev_err(sfp->dev, "module transmit fault indicated\n");
+
+		sfp_sm_next(sfp, SFP_S_TX_FAULT, T_FAULT_RECOVER);
+	}
+}
+
+static void sfp_sm_mod_init(struct sfp *sfp)
+{
+	sfp_module_tx_enable(sfp);
+
+	/* Wait t_init before indicating that the link is up, provided the
+	 * current state indicates no TX_FAULT.  If TX_FAULT clears before
+	 * this time, that's fine too.
+	 */
+	sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
+	sfp->sm_retries = 5;
+
+	/* Setting the serdes link mode is guesswork: there's no
+	 * field in the EEPROM which indicates what mode should
+	 * be used.
+	 *
+	 * If it's a gigabit-only fiber module, it probably does
+	 * not have a PHY, so switch to 802.3z negotiation mode.
+	 * Otherwise, switch to SGMII mode (which is required to
+	 * support non-gigabit speeds) and probe for a PHY.
+	 */
+	if (sfp->id.base.e1000_base_t ||
+	    sfp->id.base.e100_base_lx ||
+	    sfp->id.base.e100_base_fx)
+		sfp_sm_probe_phy(sfp);
+}
+
+static int sfp_sm_mod_hpower(struct sfp *sfp)
+{
+	u32 power;
+	u8 val;
+	int err;
+
+	power = 1000;
+	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
+		power = 1500;
+	if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
+		power = 2000;
+
+	if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE &&
+	    (sfp->id.ext.diagmon & (SFP_DIAGMON_DDM | SFP_DIAGMON_ADDRMODE)) !=
+	    SFP_DIAGMON_DDM) {
+		/* The module appears not to implement bus address 0xa2,
+		 * or requires an address change sequence, so assume that
+		 * the module powers up in the indicated power mode.
+		 */
+		if (power > sfp->max_power_mW) {
+			dev_err(sfp->dev,
+				"Host does not support %u.%uW modules\n",
+				power / 1000, (power / 100) % 10);
+			return -EINVAL;
+		}
+		return 0;
+	}
+
+	if (power > sfp->max_power_mW) {
+		dev_warn(sfp->dev,
+			 "Host does not support %u.%uW modules, module left in power mode 1\n",
+			 power / 1000, (power / 100) % 10);
+		return 0;
+	}
+
+	if (power <= 1000)
+		return 0;
+
+	err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
+	if (err != sizeof(val)) {
+		dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
+		err = -EAGAIN;
+		goto err;
+	}
+
+	val |= BIT(0);
+
+	err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
+	if (err != sizeof(val)) {
+		dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
+		err = -EAGAIN;
+		goto err;
+	}
+
+	dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
+		 power / 1000, (power / 100) % 10);
+	return T_HPOWER_LEVEL;
+
+err:
+	return err;
+}
+
+static int sfp_sm_mod_probe(struct sfp *sfp)
+{
+	/* SFP module inserted - read I2C data */
+	struct sfp_eeprom_id id;
+	bool cotsworks;
+	u8 check;
+	int ret;
+
+	ret = sfp_read(sfp, false, 0, &id, sizeof(id));
+	if (ret < 0) {
+		dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
+		return -EAGAIN;
+	}
+
+	if (ret != sizeof(id)) {
+		dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
+		return -EAGAIN;
+	}
+
+	/* Cotsworks do not seem to update the checksums when they
+	 * do the final programming with the final module part number,
+	 * serial number and date code.
+	 */
+	cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
+
+	/* Validate the checksum over the base structure */
+	check = sfp_check(&id.base, sizeof(id.base) - 1);
+	if (check != id.base.cc_base) {
+		if (cotsworks) {
+			dev_warn(sfp->dev,
+				 "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
+				 check, id.base.cc_base);
+		} else {
+			dev_err(sfp->dev,
+				"EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
+				check, id.base.cc_base);
+			print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
+				       16, 1, &id, sizeof(id), true);
+			return -EINVAL;
+		}
+	}
+
+	check = sfp_check(&id.ext, sizeof(id.ext) - 1);
+	if (check != id.ext.cc_ext) {
+		if (cotsworks) {
+			dev_warn(sfp->dev,
+				 "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
+				 check, id.ext.cc_ext);
+		} else {
+			dev_err(sfp->dev,
+				"EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
+				check, id.ext.cc_ext);
+			print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
+				       16, 1, &id, sizeof(id), true);
+			memset(&id.ext, 0, sizeof(id.ext));
+		}
+	}
+
+	sfp->id = id;
+
+	dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
+		 (int)sizeof(id.base.vendor_name), id.base.vendor_name,
+		 (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
+		 (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
+		 (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
+		 (int)sizeof(id.ext.datecode), id.ext.datecode);
+
+	/* Check whether we support this module */
+	if (!sfp->type->module_supported(&sfp->id)) {
+		dev_err(sfp->dev,
+			"module is not supported - phys id 0x%02x 0x%02x\n",
+			sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
+		return -EINVAL;
+	}
+
+	/* If the module requires address swap mode, warn about it */
+	if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
+		dev_warn(sfp->dev,
+			 "module address swap to access page 0xA2 is not supported.\n");
+
+	ret = sfp_hwmon_insert(sfp);
+	if (ret < 0)
+		return ret;
+
+	ret = sfp_module_insert(sfp->sfp_bus, &sfp->id);
+	if (ret < 0)
+		return ret;
+
+	return sfp_sm_mod_hpower(sfp);
+}
+
+static void sfp_sm_mod_remove(struct sfp *sfp)
+{
+	sfp_module_remove(sfp->sfp_bus);
+
+	sfp_hwmon_remove(sfp);
+
+	if (sfp->mod_phy)
+		sfp_sm_phy_detach(sfp);
+
+	sfp_module_tx_disable(sfp);
+
+	memset(&sfp->id, 0, sizeof(sfp->id));
+
+	dev_info(sfp->dev, "module removed\n");
+}
+
+static void sfp_sm_event(struct sfp *sfp, unsigned int event)
+{
+	mutex_lock(&sfp->sm_mutex);
+
+	dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
+		mod_state_to_str(sfp->sm_mod_state),
+		dev_state_to_str(sfp->sm_dev_state),
+		sm_state_to_str(sfp->sm_state),
+		event_to_str(event));
+
+	/* This state machine tracks the insert/remove state of
+	 * the module, and handles probing the on-board EEPROM.
+	 */
+	switch (sfp->sm_mod_state) {
+	default:
+		if (event == SFP_E_INSERT && sfp->attached) {
+			sfp_module_tx_disable(sfp);
+			sfp_sm_ins_next(sfp, SFP_MOD_PROBE, T_PROBE_INIT);
+		}
+		break;
+
+	case SFP_MOD_PROBE:
+		if (event == SFP_E_REMOVE) {
+			sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
+		} else if (event == SFP_E_TIMEOUT) {
+			int val = sfp_sm_mod_probe(sfp);
+
+			if (val == 0)
+				sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
+			else if (val > 0)
+				sfp_sm_ins_next(sfp, SFP_MOD_HPOWER, val);
+			else if (val != -EAGAIN)
+				sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
+			else
+				sfp_sm_set_timer(sfp, T_PROBE_RETRY);
+		}
+		break;
+
+	case SFP_MOD_HPOWER:
+		if (event == SFP_E_TIMEOUT) {
+			sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
+			break;
+		}
+		/* fallthrough */
+	case SFP_MOD_PRESENT:
+	case SFP_MOD_ERROR:
+		if (event == SFP_E_REMOVE) {
+			sfp_sm_mod_remove(sfp);
+			sfp_sm_ins_next(sfp, SFP_MOD_EMPTY, 0);
+		}
+		break;
+	}
+
+	/* This state machine tracks the netdev up/down state */
+	switch (sfp->sm_dev_state) {
+	default:
+		if (event == SFP_E_DEV_UP)
+			sfp->sm_dev_state = SFP_DEV_UP;
+		break;
+
+	case SFP_DEV_UP:
+		if (event == SFP_E_DEV_DOWN) {
+			/* If the module has a PHY, avoid raising TX disable
+			 * as this resets the PHY. Otherwise, raise it to
+			 * turn the laser off.
+			 */
+			if (!sfp->mod_phy)
+				sfp_module_tx_disable(sfp);
+			sfp->sm_dev_state = SFP_DEV_DOWN;
+		}
+		break;
+	}
+
+	/* Some events are global */
+	if (sfp->sm_state != SFP_S_DOWN &&
+	    (sfp->sm_mod_state != SFP_MOD_PRESENT ||
+	     sfp->sm_dev_state != SFP_DEV_UP)) {
+		if (sfp->sm_state == SFP_S_LINK_UP &&
+		    sfp->sm_dev_state == SFP_DEV_UP)
+			sfp_sm_link_down(sfp);
+		if (sfp->mod_phy)
+			sfp_sm_phy_detach(sfp);
+		sfp_sm_next(sfp, SFP_S_DOWN, 0);
+		mutex_unlock(&sfp->sm_mutex);
+		return;
+	}
+
+	/* The main state machine */
+	switch (sfp->sm_state) {
+	case SFP_S_DOWN:
+		if (sfp->sm_mod_state == SFP_MOD_PRESENT &&
+		    sfp->sm_dev_state == SFP_DEV_UP)
+			sfp_sm_mod_init(sfp);
+		break;
+
+	case SFP_S_INIT:
+		if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
+			sfp_sm_fault(sfp, true);
+		else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
+			sfp_sm_link_check_los(sfp);
+		break;
+
+	case SFP_S_WAIT_LOS:
+		if (event == SFP_E_TX_FAULT)
+			sfp_sm_fault(sfp, true);
+		else if (sfp_los_event_inactive(sfp, event))
+			sfp_sm_link_up(sfp);
+		break;
+
+	case SFP_S_LINK_UP:
+		if (event == SFP_E_TX_FAULT) {
+			sfp_sm_link_down(sfp);
+			sfp_sm_fault(sfp, true);
+		} else if (sfp_los_event_active(sfp, event)) {
+			sfp_sm_link_down(sfp);
+			sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
+		}
+		break;
+
+	case SFP_S_TX_FAULT:
+		if (event == SFP_E_TIMEOUT) {
+			sfp_module_tx_fault_reset(sfp);
+			sfp_sm_next(sfp, SFP_S_REINIT, T_INIT_JIFFIES);
+		}
+		break;
+
+	case SFP_S_REINIT:
+		if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
+			sfp_sm_fault(sfp, false);
+		} else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
+			dev_info(sfp->dev, "module transmit fault recovered\n");
+			sfp_sm_link_check_los(sfp);
+		}
+		break;
+
+	case SFP_S_TX_DISABLE:
+		break;
+	}
+
+	dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
+		mod_state_to_str(sfp->sm_mod_state),
+		dev_state_to_str(sfp->sm_dev_state),
+		sm_state_to_str(sfp->sm_state));
+
+	mutex_unlock(&sfp->sm_mutex);
+}
+
+static void sfp_attach(struct sfp *sfp)
+{
+	sfp->attached = true;
+	if (sfp->state & SFP_F_PRESENT)
+		sfp_sm_event(sfp, SFP_E_INSERT);
+}
+
+static void sfp_detach(struct sfp *sfp)
+{
+	sfp->attached = false;
+	sfp_sm_event(sfp, SFP_E_REMOVE);
+}
+
+static void sfp_start(struct sfp *sfp)
+{
+	sfp_sm_event(sfp, SFP_E_DEV_UP);
+}
+
+static void sfp_stop(struct sfp *sfp)
+{
+	sfp_sm_event(sfp, SFP_E_DEV_DOWN);
+}
+
+static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
+{
+	/* locking... and check module is present */
+
+	if (sfp->id.ext.sff8472_compliance &&
+	    !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
+		modinfo->type = ETH_MODULE_SFF_8472;
+		modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
+	} else {
+		modinfo->type = ETH_MODULE_SFF_8079;
+		modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
+	}
+	return 0;
+}
+
+static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
+			     u8 *data)
+{
+	unsigned int first, last, len;
+	int ret;
+
+	if (ee->len == 0)
+		return -EINVAL;
+
+	first = ee->offset;
+	last = ee->offset + ee->len;
+	if (first < ETH_MODULE_SFF_8079_LEN) {
+		len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
+		len -= first;
+
+		ret = sfp_read(sfp, false, first, data, len);
+		if (ret < 0)
+			return ret;
+
+		first += len;
+		data += len;
+	}
+	if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
+		len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
+		len -= first;
+		first -= ETH_MODULE_SFF_8079_LEN;
+
+		ret = sfp_read(sfp, true, first, data, len);
+		if (ret < 0)
+			return ret;
+	}
+	return 0;
+}
+
+static const struct sfp_socket_ops sfp_module_ops = {
+	.attach = sfp_attach,
+	.detach = sfp_detach,
+	.start = sfp_start,
+	.stop = sfp_stop,
+	.module_info = sfp_module_info,
+	.module_eeprom = sfp_module_eeprom,
+};
+
+static void sfp_timeout(struct work_struct *work)
+{
+	struct sfp *sfp = container_of(work, struct sfp, timeout.work);
+
+	rtnl_lock();
+	sfp_sm_event(sfp, SFP_E_TIMEOUT);
+	rtnl_unlock();
+}
+
+static void sfp_check_state(struct sfp *sfp)
+{
+	unsigned int state, i, changed;
+
+	mutex_lock(&sfp->st_mutex);
+	state = sfp_get_state(sfp);
+	changed = state ^ sfp->state;
+	changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
+
+	for (i = 0; i < GPIO_MAX; i++)
+		if (changed & BIT(i))
+			dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
+				!!(sfp->state & BIT(i)), !!(state & BIT(i)));
+
+	state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
+	sfp->state = state;
+
+	rtnl_lock();
+	if (changed & SFP_F_PRESENT)
+		sfp_sm_event(sfp, state & SFP_F_PRESENT ?
+				SFP_E_INSERT : SFP_E_REMOVE);
+
+	if (changed & SFP_F_TX_FAULT)
+		sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
+				SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
+
+	if (changed & SFP_F_LOS)
+		sfp_sm_event(sfp, state & SFP_F_LOS ?
+				SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
+	rtnl_unlock();
+	mutex_unlock(&sfp->st_mutex);
+}
+
+static irqreturn_t sfp_irq(int irq, void *data)
+{
+	struct sfp *sfp = data;
+
+	sfp_check_state(sfp);
+
+	return IRQ_HANDLED;
+}
+
+static void sfp_poll(struct work_struct *work)
+{
+	struct sfp *sfp = container_of(work, struct sfp, poll.work);
+
+	sfp_check_state(sfp);
+	mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
+}
+
+static struct sfp *sfp_alloc(struct device *dev)
+{
+	struct sfp *sfp;
+
+	sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
+	if (!sfp)
+		return ERR_PTR(-ENOMEM);
+
+	sfp->dev = dev;
+
+	mutex_init(&sfp->sm_mutex);
+	mutex_init(&sfp->st_mutex);
+	INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
+	INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
+
+	return sfp;
+}
+
+static void sfp_cleanup(void *data)
+{
+	struct sfp *sfp = data;
+
+	cancel_delayed_work_sync(&sfp->poll);
+	cancel_delayed_work_sync(&sfp->timeout);
+	if (sfp->i2c_mii) {
+		mdiobus_unregister(sfp->i2c_mii);
+		mdiobus_free(sfp->i2c_mii);
+	}
+	if (sfp->i2c)
+		i2c_put_adapter(sfp->i2c);
+	kfree(sfp);
+}
+
+static int sfp_probe(struct platform_device *pdev)
+{
+	const struct sff_data *sff;
+	struct sfp *sfp;
+	bool poll = false;
+	int irq, err, i;
+
+	sfp = sfp_alloc(&pdev->dev);
+	if (IS_ERR(sfp))
+		return PTR_ERR(sfp);
+
+	platform_set_drvdata(pdev, sfp);
+
+	err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
+	if (err < 0)
+		return err;
+
+	sff = sfp->type = &sfp_data;
+
+	if (pdev->dev.of_node) {
+		struct device_node *node = pdev->dev.of_node;
+		const struct of_device_id *id;
+		struct i2c_adapter *i2c;
+		struct device_node *np;
+
+		id = of_match_node(sfp_of_match, node);
+		if (WARN_ON(!id))
+			return -EINVAL;
+
+		sff = sfp->type = id->data;
+
+		np = of_parse_phandle(node, "i2c-bus", 0);
+		if (!np) {
+			dev_err(sfp->dev, "missing 'i2c-bus' property\n");
+			return -ENODEV;
+		}
+
+		i2c = of_find_i2c_adapter_by_node(np);
+		of_node_put(np);
+		if (!i2c)
+			return -EPROBE_DEFER;
+
+		err = sfp_i2c_configure(sfp, i2c);
+		if (err < 0) {
+			i2c_put_adapter(i2c);
+			return err;
+		}
+	}
+
+	for (i = 0; i < GPIO_MAX; i++)
+		if (sff->gpios & BIT(i)) {
+			sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
+					   gpio_of_names[i], gpio_flags[i]);
+			if (IS_ERR(sfp->gpio[i]))
+				return PTR_ERR(sfp->gpio[i]);
+		}
+
+	sfp->get_state = sfp_gpio_get_state;
+	sfp->set_state = sfp_gpio_set_state;
+
+	/* Modules that have no detect signal are always present */
+	if (!(sfp->gpio[GPIO_MODDEF0]))
+		sfp->get_state = sff_gpio_get_state;
+
+	device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
+				 &sfp->max_power_mW);
+	if (!sfp->max_power_mW)
+		sfp->max_power_mW = 1000;
+
+	dev_info(sfp->dev, "Host maximum power %u.%uW\n",
+		 sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
+
+	/* Get the initial state, and always signal TX disable,
+	 * since the network interface will not be up.
+	 */
+	sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
+
+	if (sfp->gpio[GPIO_RATE_SELECT] &&
+	    gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
+		sfp->state |= SFP_F_RATE_SELECT;
+	sfp_set_state(sfp, sfp->state);
+	sfp_module_tx_disable(sfp);
+
+	for (i = 0; i < GPIO_MAX; i++) {
+		if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
+			continue;
+
+		irq = gpiod_to_irq(sfp->gpio[i]);
+		if (irq < 0) {
+			irq = 0;
+			poll = true;
+			continue;
+		}
+
+		err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq,
+						IRQF_ONESHOT |
+						IRQF_TRIGGER_RISING |
+						IRQF_TRIGGER_FALLING,
+						dev_name(sfp->dev), sfp);
+		if (err)
+			poll = true;
+	}
+
+	if (poll)
+		mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
+
+	/* We could have an issue in cases no Tx disable pin is available or
+	 * wired as modules using a laser as their light source will continue to
+	 * be active when the fiber is removed. This could be a safety issue and
+	 * we should at least warn the user about that.
+	 */
+	if (!sfp->gpio[GPIO_TX_DISABLE])
+		dev_warn(sfp->dev,
+			 "No tx_disable pin: SFP modules will always be emitting.\n");
+
+	sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
+	if (!sfp->sfp_bus)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int sfp_remove(struct platform_device *pdev)
+{
+	struct sfp *sfp = platform_get_drvdata(pdev);
+
+	sfp_unregister_socket(sfp->sfp_bus);
+
+	return 0;
+}
+
+static struct platform_driver sfp_driver = {
+	.probe = sfp_probe,
+	.remove = sfp_remove,
+	.driver = {
+		.name = "sfp",
+		.of_match_table = sfp_of_match,
+	},
+};
+
+static int sfp_init(void)
+{
+	poll_jiffies = msecs_to_jiffies(100);
+
+	return platform_driver_register(&sfp_driver);
+}
+module_init(sfp_init);
+
+static void sfp_exit(void)
+{
+	platform_driver_unregister(&sfp_driver);
+}
+module_exit(sfp_exit);
+
+MODULE_ALIAS("platform:sfp");
+MODULE_AUTHOR("Russell King");
+MODULE_LICENSE("GPL v2");