| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/acpi.h> |
| #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] = "rx_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]; |
| int gpio_irq[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: |
| case hwmon_temp_label: |
| 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: |
| case hwmon_in_label: |
| 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: |
| case hwmon_curr_label: |
| 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: |
| case hwmon_power_label: |
| 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 char *const sfp_hwmon_power_labels[] = { |
| "TX_power", |
| "RX_power", |
| }; |
| |
| static int sfp_hwmon_read_string(struct device *dev, |
| enum hwmon_sensor_types type, |
| u32 attr, int channel, const char **str) |
| { |
| switch (type) { |
| case hwmon_curr: |
| switch (attr) { |
| case hwmon_curr_label: |
| *str = "bias"; |
| return 0; |
| default: |
| return -EOPNOTSUPP; |
| } |
| break; |
| case hwmon_temp: |
| switch (attr) { |
| case hwmon_temp_label: |
| *str = "temperature"; |
| return 0; |
| default: |
| return -EOPNOTSUPP; |
| } |
| break; |
| case hwmon_in: |
| switch (attr) { |
| case hwmon_in_label: |
| *str = "VCC"; |
| return 0; |
| default: |
| return -EOPNOTSUPP; |
| } |
| break; |
| case hwmon_power: |
| switch (attr) { |
| case hwmon_power_label: |
| *str = sfp_hwmon_power_labels[channel]; |
| return 0; |
| default: |
| return -EOPNOTSUPP; |
| } |
| break; |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static const struct hwmon_ops sfp_hwmon_ops = { |
| .is_visible = sfp_hwmon_is_visible, |
| .read = sfp_hwmon_read, |
| .read_string = sfp_hwmon_read_string, |
| }; |
| |
| 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 | |
| HWMON_T_LABEL, |
| 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 | |
| HWMON_I_LABEL, |
| 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 | |
| HWMON_C_LABEL, |
| 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 | |
| HWMON_P_LABEL, |
| /* 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 | |
| HWMON_P_LABEL, |
| 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 i2c_adapter *i2c; |
| struct sfp *sfp; |
| bool poll = false; |
| int 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 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); |
| } else if (has_acpi_companion(&pdev->dev)) { |
| struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); |
| struct fwnode_handle *fw = acpi_fwnode_handle(adev); |
| struct fwnode_reference_args args; |
| struct acpi_handle *acpi_handle; |
| int ret; |
| |
| ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args); |
| if (ret || !is_acpi_device_node(args.fwnode)) { |
| dev_err(&pdev->dev, "missing 'i2c-bus' property\n"); |
| return -ENODEV; |
| } |
| |
| acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode); |
| i2c = i2c_acpi_find_adapter_by_handle(acpi_handle); |
| } else { |
| return -EINVAL; |
| } |
| |
| 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; |
| |
| sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]); |
| if (!sfp->gpio_irq[i]) { |
| poll = true; |
| continue; |
| } |
| |
| err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i], |
| NULL, sfp_irq, |
| IRQF_ONESHOT | |
| IRQF_TRIGGER_RISING | |
| IRQF_TRIGGER_FALLING, |
| dev_name(sfp->dev), sfp); |
| if (err) { |
| sfp->gpio_irq[i] = 0; |
| 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 void sfp_shutdown(struct platform_device *pdev) |
| { |
| struct sfp *sfp = platform_get_drvdata(pdev); |
| int i; |
| |
| for (i = 0; i < GPIO_MAX; i++) { |
| if (!sfp->gpio_irq[i]) |
| continue; |
| |
| devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp); |
| } |
| |
| cancel_delayed_work_sync(&sfp->poll); |
| cancel_delayed_work_sync(&sfp->timeout); |
| } |
| |
| static struct platform_driver sfp_driver = { |
| .probe = sfp_probe, |
| .remove = sfp_remove, |
| .shutdown = sfp_shutdown, |
| .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"); |