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-rw-r--r--drivers/net/phy/sfp.c3140
1 files changed, 3140 insertions, 0 deletions
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
new file mode 100644
index 0000000000..3679a43f4e
--- /dev/null
+++ b/drivers/net/phy/sfp.c
@@ -0,0 +1,3140 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/debugfs.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/mdio/mdio-i2c.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 "sfp.h"
+#include "swphy.h"
+
+enum {
+ GPIO_MODDEF0,
+ GPIO_LOS,
+ GPIO_TX_FAULT,
+ GPIO_TX_DISABLE,
+ GPIO_RS0,
+ GPIO_RS1,
+ 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_RS0 = BIT(GPIO_RS0),
+ SFP_F_RS1 = BIT(GPIO_RS1),
+
+ SFP_F_OUTPUTS = SFP_F_TX_DISABLE | SFP_F_RS0 | SFP_F_RS1,
+
+ SFP_E_INSERT = 0,
+ SFP_E_REMOVE,
+ SFP_E_DEV_ATTACH,
+ SFP_E_DEV_DETACH,
+ 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_ERROR,
+ SFP_MOD_PROBE,
+ SFP_MOD_WAITDEV,
+ SFP_MOD_HPOWER,
+ SFP_MOD_WAITPWR,
+ SFP_MOD_PRESENT,
+
+ SFP_DEV_DETACHED = 0,
+ SFP_DEV_DOWN,
+ SFP_DEV_UP,
+
+ SFP_S_DOWN = 0,
+ SFP_S_FAIL,
+ SFP_S_WAIT,
+ SFP_S_INIT,
+ SFP_S_INIT_PHY,
+ SFP_S_INIT_TX_FAULT,
+ 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_ERROR] = "error",
+ [SFP_MOD_PROBE] = "probe",
+ [SFP_MOD_WAITDEV] = "waitdev",
+ [SFP_MOD_HPOWER] = "hpower",
+ [SFP_MOD_WAITPWR] = "waitpwr",
+ [SFP_MOD_PRESENT] = "present",
+};
+
+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_DETACHED] = "detached",
+ [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_ATTACH] = "dev_attach",
+ [SFP_E_DEV_DETACH] = "dev_detach",
+ [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_FAIL] = "fail",
+ [SFP_S_WAIT] = "wait",
+ [SFP_S_INIT] = "init",
+ [SFP_S_INIT_PHY] = "init_phy",
+ [SFP_S_INIT_TX_FAULT] = "init_tx_fault",
+ [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_names[] = {
+ "mod-def0",
+ "los",
+ "tx-fault",
+ "tx-disable",
+ "rate-select0",
+ "rate-select1",
+};
+
+static const enum gpiod_flags gpio_flags[] = {
+ GPIOD_IN,
+ GPIOD_IN,
+ GPIOD_IN,
+ GPIOD_ASIS,
+ GPIOD_ASIS,
+ GPIOD_ASIS,
+};
+
+/* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a
+ * non-cooled module to initialise its laser safety circuitry. We wait
+ * an initial T_WAIT period before we check the tx fault to give any PHY
+ * on board (for a copper SFP) time to initialise.
+ */
+#define T_WAIT msecs_to_jiffies(50)
+#define T_START_UP msecs_to_jiffies(300)
+#define T_START_UP_BAD_GPON msecs_to_jiffies(60000)
+
+/* t_reset is the time required to assert the TX_DISABLE signal to reset
+ * an indicated TX_FAULT.
+ */
+#define T_RESET_US 10
+#define T_FAULT_RECOVER msecs_to_jiffies(1000)
+
+/* N_FAULT_INIT is the number of recovery attempts at module initialisation
+ * time. If the TX_FAULT signal is not deasserted after this number of
+ * attempts at clearing it, we decide that the module is faulty.
+ * N_FAULT is the same but after the module has initialised.
+ */
+#define N_FAULT_INIT 5
+#define N_FAULT 5
+
+/* T_PHY_RETRY is the time interval between attempts to probe the PHY.
+ * R_PHY_RETRY is the number of attempts.
+ */
+#define T_PHY_RETRY msecs_to_jiffies(50)
+#define R_PHY_RETRY 12
+
+/* 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 SFF-8472 specifies t_serial ("Time from power on until module is
+ * ready for data transmission over the two wire serial bus.") as 300ms.
+ */
+#define T_SERIAL msecs_to_jiffies(300)
+#define T_HPOWER_LEVEL msecs_to_jiffies(300)
+#define T_PROBE_RETRY_INIT msecs_to_jiffies(100)
+#define R_PROBE_RETRY_INIT 10
+#define T_PROBE_RETRY_SLOW msecs_to_jiffies(5000)
+#define R_PROBE_RETRY_SLOW 12
+
+/* SFP modules appear to always have their PHY configured for bus address
+ * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
+ * RollBall SFPs access phy via SFP Enhanced Digital Diagnostic Interface
+ * via address 0x51 (mdio-i2c will use RollBall protocol on this address).
+ */
+#define SFP_PHY_ADDR 22
+#define SFP_PHY_ADDR_ROLLBALL 17
+
+/* SFP_EEPROM_BLOCK_SIZE is the size of data chunk to read the EEPROM
+ * at a time. Some SFP modules and also some Linux I2C drivers do not like
+ * reads longer than 16 bytes.
+ */
+#define SFP_EEPROM_BLOCK_SIZE 16
+
+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;
+ enum mdio_i2c_proto mdio_protocol;
+ struct phy_device *mod_phy;
+ const struct sff_data *type;
+ size_t i2c_block_size;
+ 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 need_poll;
+
+ /* Access rules:
+ * state_hw_drive: st_mutex held
+ * state_hw_mask: st_mutex held
+ * state_soft_mask: st_mutex held
+ * state: st_mutex held unless reading input bits
+ */
+ struct mutex st_mutex; /* Protects state */
+ unsigned int state_hw_drive;
+ unsigned int state_hw_mask;
+ unsigned int state_soft_mask;
+ 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_mod_tries_init;
+ unsigned char sm_mod_tries;
+ unsigned char sm_dev_state;
+ unsigned short sm_state;
+ unsigned char sm_fault_retries;
+ unsigned char sm_phy_retries;
+
+ struct sfp_eeprom_id id;
+ unsigned int module_power_mW;
+ unsigned int module_t_start_up;
+ unsigned int module_t_wait;
+
+ unsigned int rate_kbd;
+ unsigned int rs_threshold_kbd;
+ unsigned int rs_state_mask;
+
+ bool have_a2;
+ bool tx_fault_ignore;
+
+ const struct sfp_quirk *quirk;
+
+#if IS_ENABLED(CONFIG_HWMON)
+ struct sfp_diag diag;
+ struct delayed_work hwmon_probe;
+ unsigned int hwmon_tries;
+ struct device *hwmon_dev;
+ char *hwmon_name;
+#endif
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ struct dentry *debugfs_dir;
+#endif
+};
+
+static bool sff_module_supported(const struct sfp_eeprom_id *id)
+{
+ return id->base.phys_id == SFF8024_ID_SFF_8472 &&
+ 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)
+{
+ if (id->base.phys_id == SFF8024_ID_SFP &&
+ id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP)
+ return true;
+
+ /* SFP GPON module Ubiquiti U-Fiber Instant has in its EEPROM stored
+ * phys id SFF instead of SFP. Therefore mark this module explicitly
+ * as supported based on vendor name and pn match.
+ */
+ if (id->base.phys_id == SFF8024_ID_SFF_8472 &&
+ id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP &&
+ !memcmp(id->base.vendor_name, "UBNT ", 16) &&
+ !memcmp(id->base.vendor_pn, "UF-INSTANT ", 16))
+ return true;
+
+ return false;
+}
+
+static const struct sff_data sfp_data = {
+ .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
+ SFP_F_TX_DISABLE | SFP_F_RS0 | SFP_F_RS1,
+ .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 void sfp_fixup_long_startup(struct sfp *sfp)
+{
+ sfp->module_t_start_up = T_START_UP_BAD_GPON;
+}
+
+static void sfp_fixup_ignore_tx_fault(struct sfp *sfp)
+{
+ sfp->tx_fault_ignore = true;
+}
+
+// For 10GBASE-T short-reach modules
+static void sfp_fixup_10gbaset_30m(struct sfp *sfp)
+{
+ sfp->id.base.connector = SFF8024_CONNECTOR_RJ45;
+ sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SR;
+}
+
+static void sfp_fixup_rollball_proto(struct sfp *sfp, unsigned int secs)
+{
+ sfp->mdio_protocol = MDIO_I2C_ROLLBALL;
+ sfp->module_t_wait = msecs_to_jiffies(secs * 1000);
+}
+
+static void sfp_fixup_fs_10gt(struct sfp *sfp)
+{
+ sfp_fixup_10gbaset_30m(sfp);
+
+ // These SFPs need 4 seconds before the PHY can be accessed
+ sfp_fixup_rollball_proto(sfp, 4);
+}
+
+static void sfp_fixup_halny_gsfp(struct sfp *sfp)
+{
+ /* Ignore the TX_FAULT and LOS signals on this module.
+ * these are possibly used for other purposes on this
+ * module, e.g. a serial port.
+ */
+ sfp->state_hw_mask &= ~(SFP_F_TX_FAULT | SFP_F_LOS);
+}
+
+static void sfp_fixup_rollball(struct sfp *sfp)
+{
+ // Rollball SFPs need 25 seconds before the PHY can be accessed
+ sfp_fixup_rollball_proto(sfp, 25);
+}
+
+static void sfp_fixup_rollball_cc(struct sfp *sfp)
+{
+ sfp_fixup_rollball(sfp);
+
+ /* Some RollBall SFPs may have wrong (zero) extended compliance code
+ * burned in EEPROM. For PHY probing we need the correct one.
+ */
+ sfp->id.base.extended_cc = SFF8024_ECC_10GBASE_T_SFI;
+}
+
+static void sfp_quirk_2500basex(const struct sfp_eeprom_id *id,
+ unsigned long *modes,
+ unsigned long *interfaces)
+{
+ linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, modes);
+ __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces);
+}
+
+static void sfp_quirk_disable_autoneg(const struct sfp_eeprom_id *id,
+ unsigned long *modes,
+ unsigned long *interfaces)
+{
+ linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, modes);
+}
+
+static void sfp_quirk_oem_2_5g(const struct sfp_eeprom_id *id,
+ unsigned long *modes,
+ unsigned long *interfaces)
+{
+ /* Copper 2.5G SFP */
+ linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, modes);
+ __set_bit(PHY_INTERFACE_MODE_2500BASEX, interfaces);
+ sfp_quirk_disable_autoneg(id, modes, interfaces);
+}
+
+static void sfp_quirk_ubnt_uf_instant(const struct sfp_eeprom_id *id,
+ unsigned long *modes,
+ unsigned long *interfaces)
+{
+ /* Ubiquiti U-Fiber Instant module claims that support all transceiver
+ * types including 10G Ethernet which is not truth. So clear all claimed
+ * modes and set only one mode which module supports: 1000baseX_Full.
+ */
+ linkmode_zero(modes);
+ linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, modes);
+}
+
+#define SFP_QUIRK(_v, _p, _m, _f) \
+ { .vendor = _v, .part = _p, .modes = _m, .fixup = _f, }
+#define SFP_QUIRK_M(_v, _p, _m) SFP_QUIRK(_v, _p, _m, NULL)
+#define SFP_QUIRK_F(_v, _p, _f) SFP_QUIRK(_v, _p, NULL, _f)
+
+static const struct sfp_quirk sfp_quirks[] = {
+ // Alcatel Lucent G-010S-P can operate at 2500base-X, but incorrectly
+ // report 2500MBd NRZ in their EEPROM
+ SFP_QUIRK_M("ALCATELLUCENT", "G010SP", sfp_quirk_2500basex),
+
+ // Alcatel Lucent G-010S-A can operate at 2500base-X, but report 3.2GBd
+ // NRZ in their EEPROM
+ SFP_QUIRK("ALCATELLUCENT", "3FE46541AA", sfp_quirk_2500basex,
+ sfp_fixup_long_startup),
+
+ // Fiberstore SFP-10G-T doesn't identify as copper, and uses the
+ // Rollball protocol to talk to the PHY.
+ SFP_QUIRK_F("FS", "SFP-10G-T", sfp_fixup_fs_10gt),
+
+ // Fiberstore GPON-ONU-34-20BI can operate at 2500base-X, but report 1.2GBd
+ // NRZ in their EEPROM
+ SFP_QUIRK("FS", "GPON-ONU-34-20BI", sfp_quirk_2500basex,
+ sfp_fixup_ignore_tx_fault),
+
+ SFP_QUIRK_F("HALNy", "HL-GSFP", sfp_fixup_halny_gsfp),
+
+ // HG MXPD-483II-F 2.5G supports 2500Base-X, but incorrectly reports
+ // 2600MBd in their EERPOM
+ SFP_QUIRK_M("HG GENUINE", "MXPD-483II", sfp_quirk_2500basex),
+
+ // Huawei MA5671A can operate at 2500base-X, but report 1.2GBd NRZ in
+ // their EEPROM
+ SFP_QUIRK("HUAWEI", "MA5671A", sfp_quirk_2500basex,
+ sfp_fixup_ignore_tx_fault),
+
+ // FS 2.5G Base-T
+ SFP_QUIRK_M("FS", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
+
+ // Lantech 8330-262D-E can operate at 2500base-X, but incorrectly report
+ // 2500MBd NRZ in their EEPROM
+ SFP_QUIRK_M("Lantech", "8330-262D-E", sfp_quirk_2500basex),
+
+ SFP_QUIRK_M("UBNT", "UF-INSTANT", sfp_quirk_ubnt_uf_instant),
+
+ // Walsun HXSX-ATR[CI]-1 don't identify as copper, and use the
+ // Rollball protocol to talk to the PHY.
+ SFP_QUIRK_F("Walsun", "HXSX-ATRC-1", sfp_fixup_fs_10gt),
+ SFP_QUIRK_F("Walsun", "HXSX-ATRI-1", sfp_fixup_fs_10gt),
+
+ SFP_QUIRK_F("OEM", "SFP-10G-T", sfp_fixup_rollball_cc),
+ SFP_QUIRK_M("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
+ SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc),
+ SFP_QUIRK_F("OEM", "RTSFP-10G", sfp_fixup_rollball_cc),
+ SFP_QUIRK_F("Turris", "RTSFP-10", sfp_fixup_rollball),
+ SFP_QUIRK_F("Turris", "RTSFP-10G", sfp_fixup_rollball),
+};
+
+static size_t sfp_strlen(const char *str, size_t maxlen)
+{
+ size_t size, i;
+
+ /* Trailing characters should be filled with space chars, but
+ * some manufacturers can't read SFF-8472 and use NUL.
+ */
+ for (i = 0, size = 0; i < maxlen; i++)
+ if (str[i] != ' ' && str[i] != '\0')
+ size = i + 1;
+
+ return size;
+}
+
+static bool sfp_match(const char *qs, const char *str, size_t len)
+{
+ if (!qs)
+ return true;
+ if (strlen(qs) != len)
+ return false;
+ return !strncmp(qs, str, len);
+}
+
+static const struct sfp_quirk *sfp_lookup_quirk(const struct sfp_eeprom_id *id)
+{
+ const struct sfp_quirk *q;
+ unsigned int i;
+ size_t vs, ps;
+
+ vs = sfp_strlen(id->base.vendor_name, ARRAY_SIZE(id->base.vendor_name));
+ ps = sfp_strlen(id->base.vendor_pn, ARRAY_SIZE(id->base.vendor_pn));
+
+ for (i = 0, q = sfp_quirks; i < ARRAY_SIZE(sfp_quirks); i++, q++)
+ if (sfp_match(q->vendor, id->base.vendor_name, vs) &&
+ sfp_match(q->part, id->base.vendor_pn, ps))
+ return q;
+
+ return NULL;
+}
+
+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)
+{
+ unsigned int drive;
+
+ if (state & SFP_F_PRESENT)
+ /* If the module is present, drive the requested signals */
+ drive = sfp->state_hw_drive;
+ else
+ /* Otherwise, let them float to the pull-ups */
+ drive = 0;
+
+ if (sfp->gpio[GPIO_TX_DISABLE]) {
+ if (drive & SFP_F_TX_DISABLE)
+ gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
+ state & SFP_F_TX_DISABLE);
+ else
+ gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
+ }
+
+ if (sfp->gpio[GPIO_RS0]) {
+ if (drive & SFP_F_RS0)
+ gpiod_direction_output(sfp->gpio[GPIO_RS0],
+ state & SFP_F_RS0);
+ else
+ gpiod_direction_input(sfp->gpio[GPIO_RS0]);
+ }
+
+ if (sfp->gpio[GPIO_RS1]) {
+ if (drive & SFP_F_RS1)
+ gpiod_direction_output(sfp->gpio[GPIO_RS1],
+ state & SFP_F_RS1);
+ else
+ gpiod_direction_input(sfp->gpio[GPIO_RS1]);
+ }
+}
+
+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 block_size = sfp->i2c_block_size;
+ 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 > block_size)
+ this_len = block_size;
+
+ 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)
+{
+ if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
+ return -EINVAL;
+
+ sfp->i2c = i2c;
+ sfp->read = sfp_i2c_read;
+ sfp->write = sfp_i2c_write;
+
+ return 0;
+}
+
+static int sfp_i2c_mdiobus_create(struct sfp *sfp)
+{
+ struct mii_bus *i2c_mii;
+ int ret;
+
+ i2c_mii = mdio_i2c_alloc(sfp->dev, sfp->i2c, sfp->mdio_protocol);
+ 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;
+}
+
+static void sfp_i2c_mdiobus_destroy(struct sfp *sfp)
+{
+ mdiobus_unregister(sfp->i2c_mii);
+ sfp->i2c_mii = NULL;
+}
+
+/* Interface */
+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 int sfp_modify_u8(struct sfp *sfp, bool a2, u8 addr, u8 mask, u8 val)
+{
+ int ret;
+ u8 old, v;
+
+ ret = sfp_read(sfp, a2, addr, &old, sizeof(old));
+ if (ret != sizeof(old))
+ return ret;
+
+ v = (old & ~mask) | (val & mask);
+ if (v == old)
+ return sizeof(v);
+
+ return sfp_write(sfp, a2, addr, &v, sizeof(v));
+}
+
+static unsigned int sfp_soft_get_state(struct sfp *sfp)
+{
+ unsigned int state = 0;
+ u8 status;
+ int ret;
+
+ ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status));
+ if (ret == sizeof(status)) {
+ if (status & SFP_STATUS_RX_LOS)
+ state |= SFP_F_LOS;
+ if (status & SFP_STATUS_TX_FAULT)
+ state |= SFP_F_TX_FAULT;
+ } else {
+ dev_err_ratelimited(sfp->dev,
+ "failed to read SFP soft status: %pe\n",
+ ERR_PTR(ret));
+ /* Preserve the current state */
+ state = sfp->state;
+ }
+
+ return state & sfp->state_soft_mask;
+}
+
+static void sfp_soft_set_state(struct sfp *sfp, unsigned int state,
+ unsigned int soft)
+{
+ u8 mask = 0;
+ u8 val = 0;
+
+ if (soft & SFP_F_TX_DISABLE)
+ mask |= SFP_STATUS_TX_DISABLE_FORCE;
+ if (state & SFP_F_TX_DISABLE)
+ val |= SFP_STATUS_TX_DISABLE_FORCE;
+
+ if (soft & SFP_F_RS0)
+ mask |= SFP_STATUS_RS0_SELECT;
+ if (state & SFP_F_RS0)
+ val |= SFP_STATUS_RS0_SELECT;
+
+ if (mask)
+ sfp_modify_u8(sfp, true, SFP_STATUS, mask, val);
+
+ val = mask = 0;
+ if (soft & SFP_F_RS1)
+ mask |= SFP_EXT_STATUS_RS1_SELECT;
+ if (state & SFP_F_RS1)
+ val |= SFP_EXT_STATUS_RS1_SELECT;
+
+ if (mask)
+ sfp_modify_u8(sfp, true, SFP_EXT_STATUS, mask, val);
+}
+
+static void sfp_soft_start_poll(struct sfp *sfp)
+{
+ const struct sfp_eeprom_id *id = &sfp->id;
+ unsigned int mask = 0;
+
+ if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE)
+ mask |= SFP_F_TX_DISABLE;
+ if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT)
+ mask |= SFP_F_TX_FAULT;
+ if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS)
+ mask |= SFP_F_LOS;
+ if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RATE_SELECT)
+ mask |= sfp->rs_state_mask;
+
+ mutex_lock(&sfp->st_mutex);
+ // Poll the soft state for hardware pins we want to ignore
+ sfp->state_soft_mask = ~sfp->state_hw_mask & mask;
+
+ if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
+ !sfp->need_poll)
+ mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
+ mutex_unlock(&sfp->st_mutex);
+}
+
+static void sfp_soft_stop_poll(struct sfp *sfp)
+{
+ mutex_lock(&sfp->st_mutex);
+ sfp->state_soft_mask = 0;
+ mutex_unlock(&sfp->st_mutex);
+}
+
+/* sfp_get_state() - must be called with st_mutex held, or in the
+ * initialisation path.
+ */
+static unsigned int sfp_get_state(struct sfp *sfp)
+{
+ unsigned int soft = sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT);
+ unsigned int state;
+
+ state = sfp->get_state(sfp) & sfp->state_hw_mask;
+ if (state & SFP_F_PRESENT && soft)
+ state |= sfp_soft_get_state(sfp);
+
+ return state;
+}
+
+/* sfp_set_state() - must be called with st_mutex held, or in the
+ * initialisation path.
+ */
+static void sfp_set_state(struct sfp *sfp, unsigned int state)
+{
+ unsigned int soft;
+
+ sfp->set_state(sfp, state);
+
+ soft = sfp->state_soft_mask & SFP_F_OUTPUTS;
+ if (state & SFP_F_PRESENT && soft)
+ sfp_soft_set_state(sfp, state, soft);
+}
+
+static void sfp_mod_state(struct sfp *sfp, unsigned int mask, unsigned int set)
+{
+ mutex_lock(&sfp->st_mutex);
+ sfp->state = (sfp->state & ~mask) | set;
+ sfp_set_state(sfp, sfp->state);
+ mutex_unlock(&sfp->st_mutex);
+}
+
+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;
+ fallthrough;
+ 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;
+ fallthrough;
+ 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;
+ fallthrough;
+ 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;
+ fallthrough;
+ 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 const struct hwmon_channel_info * const sfp_hwmon_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_REGISTER_TZ),
+ HWMON_CHANNEL_INFO(in,
+ 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),
+ HWMON_CHANNEL_INFO(temp,
+ 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),
+ HWMON_CHANNEL_INFO(curr,
+ 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),
+ HWMON_CHANNEL_INFO(power,
+ /* 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),
+ NULL,
+};
+
+static const struct hwmon_chip_info sfp_hwmon_chip_info = {
+ .ops = &sfp_hwmon_ops,
+ .info = sfp_hwmon_info,
+};
+
+static void sfp_hwmon_probe(struct work_struct *work)
+{
+ struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work);
+ int err;
+
+ /* hwmon interface needs to access 16bit registers in atomic way to
+ * guarantee coherency of the diagnostic monitoring data. If it is not
+ * possible to guarantee coherency because EEPROM is broken in such way
+ * that does not support atomic 16bit read operation then we have to
+ * skip registration of hwmon device.
+ */
+ if (sfp->i2c_block_size < 2) {
+ dev_info(sfp->dev,
+ "skipping hwmon device registration due to broken EEPROM\n");
+ dev_info(sfp->dev,
+ "diagnostic EEPROM area cannot be read atomically to guarantee data coherency\n");
+ return;
+ }
+
+ err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
+ if (err < 0) {
+ if (sfp->hwmon_tries--) {
+ mod_delayed_work(system_wq, &sfp->hwmon_probe,
+ T_PROBE_RETRY_SLOW);
+ } else {
+ dev_warn(sfp->dev, "hwmon probe failed: %pe\n",
+ ERR_PTR(err));
+ }
+ return;
+ }
+
+ sfp->hwmon_name = hwmon_sanitize_name(dev_name(sfp->dev));
+ if (IS_ERR(sfp->hwmon_name)) {
+ dev_err(sfp->dev, "out of memory for hwmon name\n");
+ return;
+ }
+
+ sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
+ sfp->hwmon_name, sfp,
+ &sfp_hwmon_chip_info,
+ NULL);
+ if (IS_ERR(sfp->hwmon_dev))
+ dev_err(sfp->dev, "failed to register hwmon device: %ld\n",
+ PTR_ERR(sfp->hwmon_dev));
+}
+
+static int sfp_hwmon_insert(struct sfp *sfp)
+{
+ if (sfp->have_a2 && sfp->id.ext.diagmon & SFP_DIAGMON_DDM) {
+ mod_delayed_work(system_wq, &sfp->hwmon_probe, 1);
+ sfp->hwmon_tries = R_PROBE_RETRY_SLOW;
+ }
+
+ return 0;
+}
+
+static void sfp_hwmon_remove(struct sfp *sfp)
+{
+ cancel_delayed_work_sync(&sfp->hwmon_probe);
+ if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
+ hwmon_device_unregister(sfp->hwmon_dev);
+ sfp->hwmon_dev = NULL;
+ kfree(sfp->hwmon_name);
+ }
+}
+
+static int sfp_hwmon_init(struct sfp *sfp)
+{
+ INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe);
+
+ return 0;
+}
+
+static void sfp_hwmon_exit(struct sfp *sfp)
+{
+ cancel_delayed_work_sync(&sfp->hwmon_probe);
+}
+#else
+static int sfp_hwmon_insert(struct sfp *sfp)
+{
+ return 0;
+}
+
+static void sfp_hwmon_remove(struct sfp *sfp)
+{
+}
+
+static int sfp_hwmon_init(struct sfp *sfp)
+{
+ return 0;
+}
+
+static void sfp_hwmon_exit(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_mod_state(sfp, SFP_F_TX_DISABLE, SFP_F_TX_DISABLE);
+}
+
+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_mod_state(sfp, SFP_F_TX_DISABLE, 0);
+}
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static int sfp_debug_state_show(struct seq_file *s, void *data)
+{
+ struct sfp *sfp = s->private;
+
+ seq_printf(s, "Module state: %s\n",
+ mod_state_to_str(sfp->sm_mod_state));
+ seq_printf(s, "Module probe attempts: %d %d\n",
+ R_PROBE_RETRY_INIT - sfp->sm_mod_tries_init,
+ R_PROBE_RETRY_SLOW - sfp->sm_mod_tries);
+ seq_printf(s, "Device state: %s\n",
+ dev_state_to_str(sfp->sm_dev_state));
+ seq_printf(s, "Main state: %s\n",
+ sm_state_to_str(sfp->sm_state));
+ seq_printf(s, "Fault recovery remaining retries: %d\n",
+ sfp->sm_fault_retries);
+ seq_printf(s, "PHY probe remaining retries: %d\n",
+ sfp->sm_phy_retries);
+ seq_printf(s, "Signalling rate: %u kBd\n", sfp->rate_kbd);
+ seq_printf(s, "Rate select threshold: %u kBd\n",
+ sfp->rs_threshold_kbd);
+ seq_printf(s, "moddef0: %d\n", !!(sfp->state & SFP_F_PRESENT));
+ seq_printf(s, "rx_los: %d\n", !!(sfp->state & SFP_F_LOS));
+ seq_printf(s, "tx_fault: %d\n", !!(sfp->state & SFP_F_TX_FAULT));
+ seq_printf(s, "tx_disable: %d\n", !!(sfp->state & SFP_F_TX_DISABLE));
+ seq_printf(s, "rs0: %d\n", !!(sfp->state & SFP_F_RS0));
+ seq_printf(s, "rs1: %d\n", !!(sfp->state & SFP_F_RS1));
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(sfp_debug_state);
+
+static void sfp_debugfs_init(struct sfp *sfp)
+{
+ sfp->debugfs_dir = debugfs_create_dir(dev_name(sfp->dev), NULL);
+
+ debugfs_create_file("state", 0600, sfp->debugfs_dir, sfp,
+ &sfp_debug_state_fops);
+}
+
+static void sfp_debugfs_exit(struct sfp *sfp)
+{
+ debugfs_remove_recursive(sfp->debugfs_dir);
+}
+#else
+static void sfp_debugfs_init(struct sfp *sfp)
+{
+}
+
+static void sfp_debugfs_exit(struct sfp *sfp)
+{
+}
+#endif
+
+static void sfp_module_tx_fault_reset(struct sfp *sfp)
+{
+ unsigned int state;
+
+ mutex_lock(&sfp->st_mutex);
+ state = sfp->state;
+ if (!(state & SFP_F_TX_DISABLE)) {
+ sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
+
+ udelay(T_RESET_US);
+
+ sfp_set_state(sfp, state);
+ }
+ mutex_unlock(&sfp->st_mutex);
+}
+
+/* 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_mod_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)
+{
+ sfp_remove_phy(sfp->sfp_bus);
+ phy_device_remove(sfp->mod_phy);
+ phy_device_free(sfp->mod_phy);
+ sfp->mod_phy = NULL;
+}
+
+static int sfp_sm_probe_phy(struct sfp *sfp, int addr, bool is_c45)
+{
+ struct phy_device *phy;
+ int err;
+
+ phy = get_phy_device(sfp->i2c_mii, addr, is_c45);
+ if (phy == ERR_PTR(-ENODEV))
+ return PTR_ERR(phy);
+ if (IS_ERR(phy)) {
+ dev_err(sfp->dev, "mdiobus scan returned %pe\n", phy);
+ return PTR_ERR(phy);
+ }
+
+ /* Mark this PHY as being on a SFP module */
+ phy->is_on_sfp_module = true;
+
+ err = phy_device_register(phy);
+ if (err) {
+ phy_device_free(phy);
+ dev_err(sfp->dev, "phy_device_register failed: %pe\n",
+ ERR_PTR(err));
+ return err;
+ }
+
+ 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: %pe\n", ERR_PTR(err));
+ return err;
+ }
+
+ sfp->mod_phy = phy;
+
+ return 0;
+}
+
+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)
+{
+ const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
+ const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
+ __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
+ bool los = false;
+
+ /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
+ * are set, we assume that no LOS signal is available. If both are
+ * set, we assume LOS is not implemented (and is meaningless.)
+ */
+ if (los_options == los_inverted)
+ los = !(sfp->state & SFP_F_LOS);
+ else if (los_options == los_normal)
+ los = !!(sfp->state & SFP_F_LOS);
+
+ 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)
+{
+ const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
+ const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
+ __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
+
+ return (los_options == los_inverted && event == SFP_E_LOS_LOW) ||
+ (los_options == los_normal && event == SFP_E_LOS_HIGH);
+}
+
+static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
+{
+ const __be16 los_inverted = cpu_to_be16(SFP_OPTIONS_LOS_INVERTED);
+ const __be16 los_normal = cpu_to_be16(SFP_OPTIONS_LOS_NORMAL);
+ __be16 los_options = sfp->id.ext.options & (los_inverted | los_normal);
+
+ return (los_options == los_inverted && event == SFP_E_LOS_HIGH) ||
+ (los_options == los_normal && event == SFP_E_LOS_LOW);
+}
+
+static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
+{
+ if (sfp->sm_fault_retries && !--sfp->sm_fault_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, next_state, T_FAULT_RECOVER);
+ }
+}
+
+static int sfp_sm_add_mdio_bus(struct sfp *sfp)
+{
+ if (sfp->mdio_protocol != MDIO_I2C_NONE)
+ return sfp_i2c_mdiobus_create(sfp);
+
+ return 0;
+}
+
+/* Probe a SFP for a PHY device if the module supports copper - the PHY
+ * normally sits at I2C bus address 0x56, and may either be a clause 22
+ * or clause 45 PHY.
+ *
+ * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with
+ * negotiation enabled, but some may be in 1000base-X - which is for the
+ * PHY driver to determine.
+ *
+ * Clause 45 copper SFP+ modules (10G) appear to switch their interface
+ * mode according to the negotiated line speed.
+ */
+static int sfp_sm_probe_for_phy(struct sfp *sfp)
+{
+ int err = 0;
+
+ switch (sfp->mdio_protocol) {
+ case MDIO_I2C_NONE:
+ break;
+
+ case MDIO_I2C_MARVELL_C22:
+ err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, false);
+ break;
+
+ case MDIO_I2C_C45:
+ err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR, true);
+ break;
+
+ case MDIO_I2C_ROLLBALL:
+ err = sfp_sm_probe_phy(sfp, SFP_PHY_ADDR_ROLLBALL, true);
+ break;
+ }
+
+ return err;
+}
+
+static int sfp_module_parse_power(struct sfp *sfp)
+{
+ u32 power_mW = 1000;
+ bool supports_a2;
+
+ if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV10_2 &&
+ sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
+ power_mW = 1500;
+ /* Added in Rev 11.9, but there is no compliance code for this */
+ if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV11_4 &&
+ sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
+ power_mW = 2000;
+
+ /* Power level 1 modules (max. 1W) are always supported. */
+ if (power_mW <= 1000) {
+ sfp->module_power_mW = power_mW;
+ return 0;
+ }
+
+ supports_a2 = sfp->id.ext.sff8472_compliance !=
+ SFP_SFF8472_COMPLIANCE_NONE ||
+ sfp->id.ext.diagmon & SFP_DIAGMON_DDM;
+
+ if (power_mW > sfp->max_power_mW) {
+ /* Module power specification exceeds the allowed maximum. */
+ if (!supports_a2) {
+ /* The module appears not to implement bus address
+ * 0xa2, so assume that the module powers up in the
+ * indicated mode.
+ */
+ dev_err(sfp->dev,
+ "Host does not support %u.%uW modules\n",
+ power_mW / 1000, (power_mW / 100) % 10);
+ return -EINVAL;
+ } else {
+ dev_warn(sfp->dev,
+ "Host does not support %u.%uW modules, module left in power mode 1\n",
+ power_mW / 1000, (power_mW / 100) % 10);
+ return 0;
+ }
+ }
+
+ if (!supports_a2) {
+ /* The module power level is below the host maximum and the
+ * module appears not to implement bus address 0xa2, so assume
+ * that the module powers up in the indicated mode.
+ */
+ return 0;
+ }
+
+ /* If the module requires a higher power mode, but also requires
+ * an address change sequence, warn the user that the module may
+ * not be functional.
+ */
+ if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE) {
+ dev_warn(sfp->dev,
+ "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n",
+ power_mW / 1000, (power_mW / 100) % 10);
+ return 0;
+ }
+
+ sfp->module_power_mW = power_mW;
+
+ return 0;
+}
+
+static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
+{
+ int err;
+
+ err = sfp_modify_u8(sfp, true, SFP_EXT_STATUS,
+ SFP_EXT_STATUS_PWRLVL_SELECT,
+ enable ? SFP_EXT_STATUS_PWRLVL_SELECT : 0);
+ if (err != sizeof(u8)) {
+ dev_err(sfp->dev, "failed to %sable high power: %pe\n",
+ enable ? "en" : "dis", ERR_PTR(err));
+ return -EAGAIN;
+ }
+
+ if (enable)
+ dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
+ sfp->module_power_mW / 1000,
+ (sfp->module_power_mW / 100) % 10);
+
+ return 0;
+}
+
+static void sfp_module_parse_rate_select(struct sfp *sfp)
+{
+ u8 rate_id;
+
+ sfp->rs_threshold_kbd = 0;
+ sfp->rs_state_mask = 0;
+
+ if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_RATE_SELECT)))
+ /* No support for RateSelect */
+ return;
+
+ /* Default to INF-8074 RateSelect operation. The signalling threshold
+ * rate is not well specified, so always select "Full Bandwidth", but
+ * SFF-8079 reveals that it is understood that RS0 will be low for
+ * 1.0625Gb/s and high for 2.125Gb/s. Choose a value half-way between.
+ * This method exists prior to SFF-8472.
+ */
+ sfp->rs_state_mask = SFP_F_RS0;
+ sfp->rs_threshold_kbd = 1594;
+
+ /* Parse the rate identifier, which is complicated due to history:
+ * SFF-8472 rev 9.5 marks this field as reserved.
+ * SFF-8079 references SFF-8472 rev 9.5 and defines bit 0. SFF-8472
+ * compliance is not required.
+ * SFF-8472 rev 10.2 defines this field using values 0..4
+ * SFF-8472 rev 11.0 redefines this field with bit 0 for SFF-8079
+ * and even values.
+ */
+ rate_id = sfp->id.base.rate_id;
+ if (rate_id == 0)
+ /* Unspecified */
+ return;
+
+ /* SFF-8472 rev 10.0..10.4 did not account for SFF-8079 using bit 0,
+ * and allocated value 3 to SFF-8431 independent tx/rx rate select.
+ * Convert this to a SFF-8472 rev 11.0 rate identifier.
+ */
+ if (sfp->id.ext.sff8472_compliance >= SFP_SFF8472_COMPLIANCE_REV10_2 &&
+ sfp->id.ext.sff8472_compliance < SFP_SFF8472_COMPLIANCE_REV11_0 &&
+ rate_id == 3)
+ rate_id = SFF_RID_8431;
+
+ if (rate_id & SFF_RID_8079) {
+ /* SFF-8079 RateSelect / Application Select in conjunction with
+ * SFF-8472 rev 9.5. SFF-8079 defines rate_id as a bitfield
+ * with only bit 0 used, which takes precedence over SFF-8472.
+ */
+ if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_APP_SELECT_SFF8079)) {
+ /* SFF-8079 Part 1 - rate selection between Fibre
+ * Channel 1.0625/2.125/4.25 Gbd modes. Note that RS0
+ * is high for 2125, so we have to subtract 1 to
+ * include it.
+ */
+ sfp->rs_threshold_kbd = 2125 - 1;
+ sfp->rs_state_mask = SFP_F_RS0;
+ }
+ return;
+ }
+
+ /* SFF-8472 rev 9.5 does not define the rate identifier */
+ if (sfp->id.ext.sff8472_compliance <= SFP_SFF8472_COMPLIANCE_REV9_5)
+ return;
+
+ /* SFF-8472 rev 11.0 defines rate_id as a numerical value which will
+ * always have bit 0 clear due to SFF-8079's bitfield usage of rate_id.
+ */
+ switch (rate_id) {
+ case SFF_RID_8431_RX_ONLY:
+ sfp->rs_threshold_kbd = 4250;
+ sfp->rs_state_mask = SFP_F_RS0;
+ break;
+
+ case SFF_RID_8431_TX_ONLY:
+ sfp->rs_threshold_kbd = 4250;
+ sfp->rs_state_mask = SFP_F_RS1;
+ break;
+
+ case SFF_RID_8431:
+ sfp->rs_threshold_kbd = 4250;
+ sfp->rs_state_mask = SFP_F_RS0 | SFP_F_RS1;
+ break;
+
+ case SFF_RID_10G8G:
+ sfp->rs_threshold_kbd = 9000;
+ sfp->rs_state_mask = SFP_F_RS0 | SFP_F_RS1;
+ break;
+ }
+}
+
+/* GPON modules based on Realtek RTL8672 and RTL9601C chips (e.g. V-SOL
+ * V2801F, CarlitoxxPro CPGOS03-0490, Ubiquiti U-Fiber Instant, ...) do
+ * not support multibyte reads from the EEPROM. Each multi-byte read
+ * operation returns just one byte of EEPROM followed by zeros. There is
+ * no way to identify which modules are using Realtek RTL8672 and RTL9601C
+ * chips. Moreover every OEM of V-SOL V2801F module puts its own vendor
+ * name and vendor id into EEPROM, so there is even no way to detect if
+ * module is V-SOL V2801F. Therefore check for those zeros in the read
+ * data and then based on check switch to reading EEPROM to one byte
+ * at a time.
+ */
+static bool sfp_id_needs_byte_io(struct sfp *sfp, void *buf, size_t len)
+{
+ size_t i, block_size = sfp->i2c_block_size;
+
+ /* Already using byte IO */
+ if (block_size == 1)
+ return false;
+
+ for (i = 1; i < len; i += block_size) {
+ if (memchr_inv(buf + i, '\0', min(block_size - 1, len - i)))
+ return false;
+ }
+ return true;
+}
+
+static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
+{
+ u8 check;
+ int err;
+
+ if (id->base.phys_id != SFF8024_ID_SFF_8472 ||
+ id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP ||
+ id->base.connector != SFF8024_CONNECTOR_LC) {
+ dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n");
+ id->base.phys_id = SFF8024_ID_SFF_8472;
+ id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP;
+ id->base.connector = SFF8024_CONNECTOR_LC;
+ err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3);
+ if (err != 3) {
+ dev_err(sfp->dev,
+ "Failed to rewrite module EEPROM: %pe\n",
+ ERR_PTR(err));
+ return err;
+ }
+
+ /* Cotsworks modules have been found to require a delay between write operations. */
+ mdelay(50);
+
+ /* Update base structure checksum */
+ check = sfp_check(&id->base, sizeof(id->base) - 1);
+ err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1);
+ if (err != 1) {
+ dev_err(sfp->dev,
+ "Failed to update base structure checksum in fiber module EEPROM: %pe\n",
+ ERR_PTR(err));
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int sfp_module_parse_sff8472(struct sfp *sfp)
+{
+ /* 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");
+ else
+ sfp->have_a2 = true;
+
+ return 0;
+}
+
+static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
+{
+ /* SFP module inserted - read I2C data */
+ struct sfp_eeprom_id id;
+ bool cotsworks_sfbg;
+ unsigned int mask;
+ bool cotsworks;
+ u8 check;
+ int ret;
+
+ sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE;
+
+ ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
+ if (ret < 0) {
+ if (report)
+ dev_err(sfp->dev, "failed to read EEPROM: %pe\n",
+ ERR_PTR(ret));
+ return -EAGAIN;
+ }
+
+ if (ret != sizeof(id.base)) {
+ dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret));
+ return -EAGAIN;
+ }
+
+ /* Some SFP modules (e.g. Nokia 3FE46541AA) lock up if read from
+ * address 0x51 is just one byte at a time. Also SFF-8472 requires
+ * that EEPROM supports atomic 16bit read operation for diagnostic
+ * fields, so do not switch to one byte reading at a time unless it
+ * is really required and we have no other option.
+ */
+ if (sfp_id_needs_byte_io(sfp, &id.base, sizeof(id.base))) {
+ dev_info(sfp->dev,
+ "Detected broken RTL8672/RTL9601C emulated EEPROM\n");
+ dev_info(sfp->dev,
+ "Switching to reading EEPROM to one byte at a time\n");
+ sfp->i2c_block_size = 1;
+
+ ret = sfp_read(sfp, false, 0, &id.base, sizeof(id.base));
+ if (ret < 0) {
+ if (report)
+ dev_err(sfp->dev,
+ "failed to read EEPROM: %pe\n",
+ ERR_PTR(ret));
+ return -EAGAIN;
+ }
+
+ if (ret != sizeof(id.base)) {
+ dev_err(sfp->dev, "EEPROM short read: %pe\n",
+ ERR_PTR(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);
+ cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4);
+
+ /* Cotsworks SFF module EEPROM do not always have valid phys_id,
+ * phys_ext_id, and connector bytes. Rewrite SFF EEPROM bytes if
+ * Cotsworks PN matches and bytes are not correct.
+ */
+ if (cotsworks && cotsworks_sfbg) {
+ ret = sfp_cotsworks_fixup_check(sfp, &id);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* 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;
+ }
+ }
+
+ ret = sfp_read(sfp, false, SFP_CC_BASE + 1, &id.ext, sizeof(id.ext));
+ if (ret < 0) {
+ if (report)
+ dev_err(sfp->dev, "failed to read EEPROM: %pe\n",
+ ERR_PTR(ret));
+ return -EAGAIN;
+ }
+
+ if (ret != sizeof(id.ext)) {
+ dev_err(sfp->dev, "EEPROM short read: %pe\n", ERR_PTR(ret));
+ return -EAGAIN;
+ }
+
+ 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(&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 (sfp->id.ext.sff8472_compliance != SFP_SFF8472_COMPLIANCE_NONE) {
+ ret = sfp_module_parse_sff8472(sfp);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* Parse the module power requirement */
+ ret = sfp_module_parse_power(sfp);
+ if (ret < 0)
+ return ret;
+
+ sfp_module_parse_rate_select(sfp);
+
+ mask = SFP_F_PRESENT;
+ if (sfp->gpio[GPIO_TX_DISABLE])
+ mask |= SFP_F_TX_DISABLE;
+ if (sfp->gpio[GPIO_TX_FAULT])
+ mask |= SFP_F_TX_FAULT;
+ if (sfp->gpio[GPIO_LOS])
+ mask |= SFP_F_LOS;
+ if (sfp->gpio[GPIO_RS0])
+ mask |= SFP_F_RS0;
+ if (sfp->gpio[GPIO_RS1])
+ mask |= SFP_F_RS1;
+
+ sfp->module_t_start_up = T_START_UP;
+ sfp->module_t_wait = T_WAIT;
+
+ sfp->tx_fault_ignore = false;
+
+ if (sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SFI ||
+ sfp->id.base.extended_cc == SFF8024_ECC_10GBASE_T_SR ||
+ sfp->id.base.extended_cc == SFF8024_ECC_5GBASE_T ||
+ sfp->id.base.extended_cc == SFF8024_ECC_2_5GBASE_T)
+ sfp->mdio_protocol = MDIO_I2C_C45;
+ else if (sfp->id.base.e1000_base_t)
+ sfp->mdio_protocol = MDIO_I2C_MARVELL_C22;
+ else
+ sfp->mdio_protocol = MDIO_I2C_NONE;
+
+ sfp->quirk = sfp_lookup_quirk(&id);
+
+ mutex_lock(&sfp->st_mutex);
+ /* Initialise state bits to use from hardware */
+ sfp->state_hw_mask = mask;
+
+ /* We want to drive the rate select pins that the module is using */
+ sfp->state_hw_drive |= sfp->rs_state_mask;
+
+ if (sfp->quirk && sfp->quirk->fixup)
+ sfp->quirk->fixup(sfp);
+ mutex_unlock(&sfp->st_mutex);
+
+ return 0;
+}
+
+static void sfp_sm_mod_remove(struct sfp *sfp)
+{
+ if (sfp->sm_mod_state > SFP_MOD_WAITDEV)
+ sfp_module_remove(sfp->sfp_bus);
+
+ sfp_hwmon_remove(sfp);
+
+ memset(&sfp->id, 0, sizeof(sfp->id));
+ sfp->module_power_mW = 0;
+ sfp->state_hw_drive = SFP_F_TX_DISABLE;
+ sfp->have_a2 = false;
+
+ dev_info(sfp->dev, "module removed\n");
+}
+
+/* This state machine tracks the upstream's state */
+static void sfp_sm_device(struct sfp *sfp, unsigned int event)
+{
+ switch (sfp->sm_dev_state) {
+ default:
+ if (event == SFP_E_DEV_ATTACH)
+ sfp->sm_dev_state = SFP_DEV_DOWN;
+ break;
+
+ case SFP_DEV_DOWN:
+ if (event == SFP_E_DEV_DETACH)
+ sfp->sm_dev_state = SFP_DEV_DETACHED;
+ else if (event == SFP_E_DEV_UP)
+ sfp->sm_dev_state = SFP_DEV_UP;
+ break;
+
+ case SFP_DEV_UP:
+ if (event == SFP_E_DEV_DETACH)
+ sfp->sm_dev_state = SFP_DEV_DETACHED;
+ else if (event == SFP_E_DEV_DOWN)
+ sfp->sm_dev_state = SFP_DEV_DOWN;
+ break;
+ }
+}
+
+/* This state machine tracks the insert/remove state of the module, probes
+ * the on-board EEPROM, and sets up the power level.
+ */
+static void sfp_sm_module(struct sfp *sfp, unsigned int event)
+{
+ int err;
+
+ /* Handle remove event globally, it resets this state machine */
+ if (event == SFP_E_REMOVE) {
+ if (sfp->sm_mod_state > SFP_MOD_PROBE)
+ sfp_sm_mod_remove(sfp);
+ sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
+ return;
+ }
+
+ /* Handle device detach globally */
+ if (sfp->sm_dev_state < SFP_DEV_DOWN &&
+ sfp->sm_mod_state > SFP_MOD_WAITDEV) {
+ if (sfp->module_power_mW > 1000 &&
+ sfp->sm_mod_state > SFP_MOD_HPOWER)
+ sfp_sm_mod_hpower(sfp, false);
+ sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
+ return;
+ }
+
+ switch (sfp->sm_mod_state) {
+ default:
+ if (event == SFP_E_INSERT) {
+ sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL);
+ sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT;
+ sfp->sm_mod_tries = R_PROBE_RETRY_SLOW;
+ }
+ break;
+
+ case SFP_MOD_PROBE:
+ /* Wait for T_PROBE_INIT to time out */
+ if (event != SFP_E_TIMEOUT)
+ break;
+
+ err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1);
+ if (err == -EAGAIN) {
+ if (sfp->sm_mod_tries_init &&
+ --sfp->sm_mod_tries_init) {
+ sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
+ break;
+ } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) {
+ if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1)
+ dev_warn(sfp->dev,
+ "please wait, module slow to respond\n");
+ sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW);
+ break;
+ }
+ }
+ if (err < 0) {
+ sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
+ break;
+ }
+
+ /* Force a poll to re-read the hardware signal state after
+ * sfp_sm_mod_probe() changed state_hw_mask.
+ */
+ mod_delayed_work(system_wq, &sfp->poll, 1);
+
+ err = sfp_hwmon_insert(sfp);
+ if (err)
+ dev_warn(sfp->dev, "hwmon probe failed: %pe\n",
+ ERR_PTR(err));
+
+ sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
+ fallthrough;
+ case SFP_MOD_WAITDEV:
+ /* Ensure that the device is attached before proceeding */
+ if (sfp->sm_dev_state < SFP_DEV_DOWN)
+ break;
+
+ /* Report the module insertion to the upstream device */
+ err = sfp_module_insert(sfp->sfp_bus, &sfp->id,
+ sfp->quirk);
+ if (err < 0) {
+ sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
+ break;
+ }
+
+ /* If this is a power level 1 module, we are done */
+ if (sfp->module_power_mW <= 1000)
+ goto insert;
+
+ sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0);
+ fallthrough;
+ case SFP_MOD_HPOWER:
+ /* Enable high power mode */
+ err = sfp_sm_mod_hpower(sfp, true);
+ if (err < 0) {
+ if (err != -EAGAIN) {
+ sfp_module_remove(sfp->sfp_bus);
+ sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
+ } else {
+ sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
+ }
+ break;
+ }
+
+ sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
+ break;
+
+ case SFP_MOD_WAITPWR:
+ /* Wait for T_HPOWER_LEVEL to time out */
+ if (event != SFP_E_TIMEOUT)
+ break;
+
+ insert:
+ sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0);
+ break;
+
+ case SFP_MOD_PRESENT:
+ case SFP_MOD_ERROR:
+ break;
+ }
+}
+
+static void sfp_sm_main(struct sfp *sfp, unsigned int event)
+{
+ unsigned long timeout;
+ int ret;
+
+ /* 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->sm_state > SFP_S_INIT)
+ sfp_module_stop(sfp->sfp_bus);
+ if (sfp->mod_phy)
+ sfp_sm_phy_detach(sfp);
+ if (sfp->i2c_mii)
+ sfp_i2c_mdiobus_destroy(sfp);
+ sfp_module_tx_disable(sfp);
+ sfp_soft_stop_poll(sfp);
+ sfp_sm_next(sfp, SFP_S_DOWN, 0);
+ 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)
+ break;
+
+ /* Only use the soft state bits if we have access to the A2h
+ * memory, which implies that we have some level of SFF-8472
+ * compliance.
+ */
+ if (sfp->have_a2)
+ sfp_soft_start_poll(sfp);
+
+ sfp_module_tx_enable(sfp);
+
+ /* Initialise the fault clearance retries */
+ sfp->sm_fault_retries = N_FAULT_INIT;
+
+ /* We need to check the TX_FAULT state, which is not defined
+ * while TX_DISABLE is asserted. The earliest we want to do
+ * anything (such as probe for a PHY) is 50ms (or more on
+ * specific modules).
+ */
+ sfp_sm_next(sfp, SFP_S_WAIT, sfp->module_t_wait);
+ break;
+
+ case SFP_S_WAIT:
+ if (event != SFP_E_TIMEOUT)
+ break;
+
+ if (sfp->state & SFP_F_TX_FAULT) {
+ /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431)
+ * from the TX_DISABLE deassertion for the module to
+ * initialise, which is indicated by TX_FAULT
+ * deasserting.
+ */
+ timeout = sfp->module_t_start_up;
+ if (timeout > sfp->module_t_wait)
+ timeout -= sfp->module_t_wait;
+ else
+ timeout = 1;
+
+ sfp_sm_next(sfp, SFP_S_INIT, timeout);
+ } else {
+ /* TX_FAULT is not asserted, assume the module has
+ * finished initialising.
+ */
+ goto init_done;
+ }
+ break;
+
+ case SFP_S_INIT:
+ if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
+ /* TX_FAULT is still asserted after t_init
+ * or t_start_up, so assume there is a fault.
+ */
+ sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
+ sfp->sm_fault_retries == N_FAULT_INIT);
+ } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
+ init_done:
+ /* Create mdiobus and start trying for PHY */
+ ret = sfp_sm_add_mdio_bus(sfp);
+ if (ret < 0) {
+ sfp_sm_next(sfp, SFP_S_FAIL, 0);
+ break;
+ }
+ sfp->sm_phy_retries = R_PHY_RETRY;
+ goto phy_probe;
+ }
+ break;
+
+ case SFP_S_INIT_PHY:
+ if (event != SFP_E_TIMEOUT)
+ break;
+ phy_probe:
+ /* TX_FAULT deasserted or we timed out with TX_FAULT
+ * clear. Probe for the PHY and check the LOS state.
+ */
+ ret = sfp_sm_probe_for_phy(sfp);
+ if (ret == -ENODEV) {
+ if (--sfp->sm_phy_retries) {
+ sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY);
+ break;
+ } else {
+ dev_info(sfp->dev, "no PHY detected\n");
+ }
+ } else if (ret) {
+ sfp_sm_next(sfp, SFP_S_FAIL, 0);
+ break;
+ }
+ if (sfp_module_start(sfp->sfp_bus)) {
+ sfp_sm_next(sfp, SFP_S_FAIL, 0);
+ break;
+ }
+ sfp_sm_link_check_los(sfp);
+
+ /* Reset the fault retry count */
+ sfp->sm_fault_retries = N_FAULT;
+ break;
+
+ case SFP_S_INIT_TX_FAULT:
+ if (event == SFP_E_TIMEOUT) {
+ sfp_module_tx_fault_reset(sfp);
+ sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up);
+ }
+ break;
+
+ case SFP_S_WAIT_LOS:
+ if (event == SFP_E_TX_FAULT)
+ sfp_sm_fault(sfp, SFP_S_TX_FAULT, 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, SFP_S_TX_FAULT, 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, sfp->module_t_start_up);
+ }
+ break;
+
+ case SFP_S_REINIT:
+ if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
+ sfp_sm_fault(sfp, SFP_S_TX_FAULT, 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;
+ }
+}
+
+static void __sfp_sm_event(struct sfp *sfp, unsigned int event)
+{
+ 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));
+
+ sfp_sm_device(sfp, event);
+ sfp_sm_module(sfp, event);
+ sfp_sm_main(sfp, event);
+
+ 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));
+}
+
+static void sfp_sm_event(struct sfp *sfp, unsigned int event)
+{
+ mutex_lock(&sfp->sm_mutex);
+ __sfp_sm_event(sfp, event);
+ mutex_unlock(&sfp->sm_mutex);
+}
+
+static void sfp_attach(struct sfp *sfp)
+{
+ sfp_sm_event(sfp, SFP_E_DEV_ATTACH);
+}
+
+static void sfp_detach(struct sfp *sfp)
+{
+ sfp_sm_event(sfp, SFP_E_DEV_DETACH);
+}
+
+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 void sfp_set_signal_rate(struct sfp *sfp, unsigned int rate_kbd)
+{
+ unsigned int set;
+
+ sfp->rate_kbd = rate_kbd;
+
+ if (rate_kbd > sfp->rs_threshold_kbd)
+ set = sfp->rs_state_mask;
+ else
+ set = 0;
+
+ sfp_mod_state(sfp, SFP_F_RS0 | SFP_F_RS1, set);
+}
+
+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 (!(sfp->state & SFP_F_PRESENT))
+ return -ENODEV;
+
+ 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 int sfp_module_eeprom_by_page(struct sfp *sfp,
+ const struct ethtool_module_eeprom *page,
+ struct netlink_ext_ack *extack)
+{
+ if (!(sfp->state & SFP_F_PRESENT))
+ return -ENODEV;
+
+ if (page->bank) {
+ NL_SET_ERR_MSG(extack, "Banks not supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (page->page) {
+ NL_SET_ERR_MSG(extack, "Only page 0 supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (page->i2c_address != 0x50 &&
+ page->i2c_address != 0x51) {
+ NL_SET_ERR_MSG(extack, "Only address 0x50 and 0x51 supported");
+ return -EOPNOTSUPP;
+ }
+
+ return sfp_read(sfp, page->i2c_address == 0x51, page->offset,
+ page->data, page->length);
+};
+
+static const struct sfp_socket_ops sfp_module_ops = {
+ .attach = sfp_attach,
+ .detach = sfp_detach,
+ .start = sfp_start,
+ .stop = sfp_stop,
+ .set_signal_rate = sfp_set_signal_rate,
+ .module_info = sfp_module_info,
+ .module_eeprom = sfp_module_eeprom,
+ .module_eeprom_by_page = sfp_module_eeprom_by_page,
+};
+
+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;
+
+ rtnl_lock();
+ mutex_lock(&sfp->st_mutex);
+ state = sfp_get_state(sfp);
+ changed = state ^ sfp->state;
+ if (sfp->tx_fault_ignore)
+ changed &= SFP_F_PRESENT | SFP_F_LOS;
+ else
+ 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_names[i],
+ !!(sfp->state & BIT(i)), !!(state & BIT(i)));
+
+ state |= sfp->state & SFP_F_OUTPUTS;
+ sfp->state = state;
+ mutex_unlock(&sfp->st_mutex);
+
+ mutex_lock(&sfp->sm_mutex);
+ 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);
+ mutex_unlock(&sfp->sm_mutex);
+ rtnl_unlock();
+}
+
+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);
+
+ // st_mutex doesn't need to be held here for state_soft_mask,
+ // it's unimportant if we race while reading this.
+ if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) ||
+ sfp->need_poll)
+ 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;
+ sfp->i2c_block_size = SFP_EEPROM_BLOCK_SIZE;
+
+ mutex_init(&sfp->sm_mutex);
+ mutex_init(&sfp->st_mutex);
+ INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
+ INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
+
+ sfp_hwmon_init(sfp);
+
+ return sfp;
+}
+
+static void sfp_cleanup(void *data)
+{
+ struct sfp *sfp = data;
+
+ sfp_hwmon_exit(sfp);
+
+ 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_i2c_get(struct sfp *sfp)
+{
+ struct fwnode_handle *h;
+ struct i2c_adapter *i2c;
+ int err;
+
+ h = fwnode_find_reference(dev_fwnode(sfp->dev), "i2c-bus", 0);
+ if (IS_ERR(h)) {
+ dev_err(sfp->dev, "missing 'i2c-bus' property\n");
+ return -ENODEV;
+ }
+
+ i2c = i2c_get_adapter_by_fwnode(h);
+ if (!i2c) {
+ err = -EPROBE_DEFER;
+ goto put;
+ }
+
+ err = sfp_i2c_configure(sfp, i2c);
+ if (err)
+ i2c_put_adapter(i2c);
+put:
+ fwnode_handle_put(h);
+ return err;
+}
+
+static int sfp_probe(struct platform_device *pdev)
+{
+ const struct sff_data *sff;
+ char *sfp_irq_name;
+ struct sfp *sfp;
+ 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_or_reset(sfp->dev, sfp_cleanup, sfp);
+ if (err < 0)
+ return err;
+
+ sff = device_get_match_data(sfp->dev);
+ if (!sff)
+ sff = &sfp_data;
+
+ sfp->type = sff;
+
+ err = sfp_i2c_get(sfp);
+ if (err)
+ return err;
+
+ for (i = 0; i < GPIO_MAX; i++)
+ if (sff->gpios & BIT(i)) {
+ sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
+ gpio_names[i], gpio_flags[i]);
+ if (IS_ERR(sfp->gpio[i]))
+ return PTR_ERR(sfp->gpio[i]);
+ }
+
+ sfp->state_hw_mask = SFP_F_PRESENT;
+ sfp->state_hw_drive = SFP_F_TX_DISABLE;
+
+ 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 < 1000) {
+ if (sfp->max_power_mW)
+ dev_warn(sfp->dev,
+ "Firmware bug: host maximum power should be at least 1W\n");
+ 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_RS0] &&
+ gpiod_get_value_cansleep(sfp->gpio[GPIO_RS0]))
+ sfp->state |= SFP_F_RS0;
+ sfp_set_state(sfp, sfp->state);
+ sfp_module_tx_disable(sfp);
+ if (sfp->state & SFP_F_PRESENT) {
+ rtnl_lock();
+ sfp_sm_event(sfp, SFP_E_INSERT);
+ rtnl_unlock();
+ }
+
+ 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] < 0) {
+ sfp->gpio_irq[i] = 0;
+ sfp->need_poll = true;
+ continue;
+ }
+
+ sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL,
+ "%s-%s", dev_name(sfp->dev),
+ gpio_names[i]);
+
+ if (!sfp_irq_name)
+ return -ENOMEM;
+
+ err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
+ NULL, sfp_irq,
+ IRQF_ONESHOT |
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ sfp_irq_name, sfp);
+ if (err) {
+ sfp->gpio_irq[i] = 0;
+ sfp->need_poll = true;
+ }
+ }
+
+ if (sfp->need_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;
+
+ sfp_debugfs_init(sfp);
+
+ return 0;
+}
+
+static int sfp_remove(struct platform_device *pdev)
+{
+ struct sfp *sfp = platform_get_drvdata(pdev);
+
+ sfp_debugfs_exit(sfp);
+ sfp_unregister_socket(sfp->sfp_bus);
+
+ rtnl_lock();
+ sfp_sm_event(sfp, SFP_E_REMOVE);
+ rtnl_unlock();
+
+ 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");