--- /dev/null
+#include <linux/delay.h>
+#include <linux/gpio.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_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 *gpio_of_names[] = {
+ "moddef0",
+ "los",
+ "tx-fault",
+ "tx-disable",
+ "rate-select",
+};
+
+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_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
+
+static DEFINE_MUTEX(sfp_mutex);
+
+struct sfp {
+ struct device *dev;
+ struct i2c_adapter *i2c;
+ struct mii_bus *i2c_mii;
+ struct sfp_bus *sfp_bus;
+ struct phy_device *mod_phy;
+
+ unsigned int (*get_state)(struct sfp *);
+ void (*set_state)(struct sfp *, unsigned int);
+ int (*read)(struct sfp *, bool, u8, void *, size_t);
+
+ struct gpio_desc *gpio[GPIO_MAX];
+
+ unsigned int state;
+ struct delayed_work poll;
+ struct delayed_work timeout;
+ struct mutex sm_mutex;
+ unsigned char sm_mod_state;
+ unsigned char sm_dev_state;
+ unsigned short sm_state;
+ unsigned int sm_retries;
+
+ struct sfp_eeprom_id id;
+};
+
+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 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 i2c_adapter *i2c, u8 bus_addr, u8 dev_addr,
+ void *buf, size_t len)
+{
+ struct i2c_msg msgs[2];
+ 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;
+
+ ret = i2c_transfer(i2c, msgs, ARRAY_SIZE(msgs));
+ if (ret < 0)
+ return ret;
+
+ return ret == ARRAY_SIZE(msgs) ? len : 0;
+}
+
+static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 addr, void *buf,
+ size_t len)
+{
+ return sfp__i2c_read(sfp->i2c, a2 ? 0x51 : 0x50, addr, buf, len);
+}
+
+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;
+
+ 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 unsigned int sfp_check(void *buf, size_t len)
+{
+ u8 *p, check;
+
+ for (p = buf, check = 0; len; p++, len--)
+ check += *p;
+
+ return check;
+}
+
+/* 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 (IS_ERR(phy)) {
+ dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
+ return;
+ }
+ if (!phy) {
+ dev_info(sfp->dev, "no PHY detected\n");
+ 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;
+
+ /* FIXME: what if neither SFP_OPTIONS_LOS_INVERTED nor
+ * SFP_OPTIONS_LOS_NORMAL are set? For now, we assume
+ * the same as SFP_OPTIONS_LOS_NORMAL set.
+ */
+ if (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED)
+ los ^= SFP_F_LOS;
+
+ if (los)
+ sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
+ else
+ sfp_sm_link_up(sfp);
+}
+
+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_probe(struct sfp *sfp)
+{
+ /* SFP module inserted - read I2C data */
+ struct sfp_eeprom_id id;
+ char vendor[17];
+ char part[17];
+ char sn[17];
+ char date[9];
+ char rev[5];
+ u8 check;
+ int err;
+
+ err = sfp_read(sfp, false, 0, &id, sizeof(id));
+ if (err < 0) {
+ dev_err(sfp->dev, "failed to read EEPROM: %d\n", err);
+ return -EAGAIN;
+ }
+
+ if (err != sizeof(id)) {
+ dev_err(sfp->dev, "EEPROM short read: %d\n", err);
+ return -EAGAIN;
+ }
+
+ /* Validate the checksum over the base structure */
+ check = sfp_check(&id.base, sizeof(id.base) - 1);
+ if (check != id.base.cc_base) {
+ dev_err(sfp->dev,
+ "EEPROM base structure checksum failure: 0x%02x\n",
+ check);
+ print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
+ 16, 1, &id, sizeof(id.base) - 1, true);
+ return -EINVAL;
+ }
+
+ check = sfp_check(&id.ext, sizeof(id.ext) - 1);
+ if (check != id.ext.cc_ext) {
+ dev_err(sfp->dev,
+ "EEPROM extended structure checksum failure: 0x%02x\n",
+ check);
+ memset(&id.ext, 0, sizeof(id.ext));
+ }
+
+ sfp->id = id;
+
+ memcpy(vendor, sfp->id.base.vendor_name, 16);
+ vendor[16] = '\0';
+ memcpy(part, sfp->id.base.vendor_pn, 16);
+ part[16] = '\0';
+ memcpy(rev, sfp->id.base.vendor_rev, 4);
+ rev[4] = '\0';
+ memcpy(sn, sfp->id.ext.vendor_sn, 16);
+ sn[16] = '\0';
+ memcpy(date, sfp->id.ext.datecode, 8);
+ date[8] = '\0';
+
+ dev_info(sfp->dev, "module %s %s rev %s sn %s dc %s\n", vendor, part, rev, sn, date);
+
+ /* We only support SFP modules, not the legacy GBIC modules. */
+ if (sfp->id.base.phys_id != SFP_PHYS_ID_SFP ||
+ sfp->id.base.phys_ext_id != SFP_PHYS_EXT_ID_SFP) {
+ dev_err(sfp->dev, "module is not SFP - phys id 0x%02x 0x%02x\n",
+ sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
+ return -EINVAL;
+ }
+
+ return sfp_module_insert(sfp->sfp_bus, &sfp->id);
+}
+
+static void sfp_sm_mod_remove(struct sfp *sfp)
+{
+ sfp_module_remove(sfp->sfp_bus);
+
+ 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 %u:%u:%u event %u\n",
+ sfp->sm_mod_state, sfp->sm_dev_state, sfp->sm_state, 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_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 err = sfp_sm_mod_probe(sfp);
+
+ if (err == 0)
+ sfp_sm_ins_next(sfp, SFP_MOD_PRESENT, 0);
+ else if (err == -EAGAIN)
+ sfp_sm_set_timer(sfp, T_PROBE_RETRY);
+ else
+ sfp_sm_ins_next(sfp, SFP_MOD_ERROR, 0);
+ }
+ break;
+
+ 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 (event ==
+ (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED ?
+ SFP_E_LOS_HIGH : SFP_E_LOS_LOW))
+ 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 (event ==
+ (sfp->id.ext.options & SFP_OPTIONS_LOS_INVERTED ?
+ SFP_E_LOS_LOW : SFP_E_LOS_HIGH)) {
+ 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 %u:%u:%u\n",
+ sfp->sm_mod_state, sfp->sm_dev_state, sfp->sm_state);
+
+ mutex_unlock(&sfp->sm_mutex);
+}
+
+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) {
+ 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_8079_LEN &&
+ first < ETH_MODULE_SFF_8472_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 = {
+ .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;
+
+ 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();
+}
+
+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);
+ 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)
+{
+ struct sfp *sfp;
+ bool poll = false;
+ int irq, err, i;
+
+ sfp = sfp_alloc(&pdev->dev);
+ if (IS_ERR(sfp))
+ return PTR_ERR(sfp);
+
+ platform_set_drvdata(pdev, sfp);
+
+ err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
+ if (err < 0)
+ return err;
+
+ if (pdev->dev.of_node) {
+ struct device_node *node = pdev->dev.of_node;
+ struct device_node *np;
+
+ np = of_parse_phandle(node, "i2c-bus", 0);
+ if (np) {
+ struct i2c_adapter *i2c;
+
+ i2c = of_find_i2c_adapter_by_node(np);
+ of_node_put(np);
+ if (!i2c)
+ return -EPROBE_DEFER;
+
+ err = sfp_i2c_configure(sfp, i2c);
+ if (err < 0) {
+ i2c_put_adapter(i2c);
+ return err;
+ }
+ }
+
+ for (i = 0; i < GPIO_MAX; i++) {
+ 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;
+ }
+
+ sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
+ if (!sfp->sfp_bus)
+ return -ENOMEM;
+
+ /* 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);
+ rtnl_lock();
+ if (sfp->state & SFP_F_PRESENT)
+ 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;
+
+ irq = gpiod_to_irq(sfp->gpio[i]);
+ if (!irq) {
+ poll = true;
+ continue;
+ }
+
+ err = devm_request_threaded_irq(sfp->dev, irq, NULL, sfp_irq,
+ IRQF_ONESHOT |
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING,
+ dev_name(sfp->dev), sfp);
+ if (err)
+ poll = true;
+ }
+
+ if (poll)
+ mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
+
+ 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 const struct of_device_id sfp_of_match[] = {
+ { .compatible = "sff,sfp", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, sfp_of_match);
+
+static struct platform_driver sfp_driver = {
+ .probe = sfp_probe,
+ .remove = sfp_remove,
+ .driver = {
+ .name = "sfp",
+ .of_match_table = sfp_of_match,
+ },
+};
+
+static int sfp_init(void)
+{
+ poll_jiffies = msecs_to_jiffies(100);
+
+ return platform_driver_register(&sfp_driver);
+}
+module_init(sfp_init);
+
+static void sfp_exit(void)
+{
+ platform_driver_unregister(&sfp_driver);
+}
+module_exit(sfp_exit);
+
+MODULE_ALIAS("platform:sfp");
+MODULE_AUTHOR("Russell King");
+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / blogic.git / commitdiff