sfp: add sff module support

Add support for SFF modules, which are soldered down SFP modules.
These have a different phys_id value, and also have the present and
rate select signals omitted compared with their socketed counter-parts.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 9dfc1c4..9651155 100644 (file)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -98,12 +98,18 @@ static const enum gpiod_flags gpio_flags[] = {
 
 static DEFINE_MUTEX(sfp_mutex);
 
+struct sff_data {
+       unsigned int gpios;
+       bool (*module_supported)(const struct sfp_eeprom_id *id);
+};
+
 struct sfp {
        struct device *dev;
        struct i2c_adapter *i2c;
        struct mii_bus *i2c_mii;
        struct sfp_bus *sfp_bus;
        struct phy_device *mod_phy;
+       const struct sff_data *type;
 
        unsigned int (*get_state)(struct sfp *);
        void (*set_state)(struct sfp *, unsigned int);
@@ -123,6 +129,36 @@ struct sfp {
        struct sfp_eeprom_id id;
 };
 
+static bool sff_module_supported(const struct sfp_eeprom_id *id)
+{
+       return id->base.phys_id == SFP_PHYS_ID_SFF &&
+              id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
+}
+
+static const struct sff_data sff_data = {
+       .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
+       .module_supported = sff_module_supported,
+};
+
+static bool sfp_module_supported(const struct sfp_eeprom_id *id)
+{
+       return id->base.phys_id == SFP_PHYS_ID_SFP &&
+              id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
+}
+
+static const struct sff_data sfp_data = {
+       .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
+                SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
+       .module_supported = sfp_module_supported,
+};
+
+static const struct of_device_id sfp_of_match[] = {
+       { .compatible = "sff,sff", .data = &sff_data, },
+       { .compatible = "sff,sfp", .data = &sfp_data, },
+       { },
+};
+MODULE_DEVICE_TABLE(of, sfp_of_match);
+
 static unsigned long poll_jiffies;
 
 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
@@ -141,6 +177,11 @@ static unsigned int sfp_gpio_get_state(struct sfp *sfp)
        return state;
 }
 
+static unsigned int sff_gpio_get_state(struct sfp *sfp)
+{
+       return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
+}
+
 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
 {
        if (state & SFP_F_PRESENT) {
@@ -479,10 +520,10 @@ static int sfp_sm_mod_probe(struct sfp *sfp)
        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",
+       /* Check whether we support this module */
+       if (!sfp->type->module_supported(&sfp->id)) {
+               dev_err(sfp->dev,
+                       "module is not supported - phys id 0x%02x 0x%02x\n",
                        sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
                return -EINVAL;
        }
@@ -801,6 +842,7 @@ static void sfp_cleanup(void *data)
 
 static int sfp_probe(struct platform_device *pdev)
 {
+       const struct sff_data *sff;
        struct sfp *sfp;
        bool poll = false;
        int irq, err, i;
@@ -815,10 +857,19 @@ static int sfp_probe(struct platform_device *pdev)
        if (err < 0)
                return err;
 
+       sff = sfp->type = &sfp_data;
+
        if (pdev->dev.of_node) {
                struct device_node *node = pdev->dev.of_node;
+               const struct of_device_id *id;
                struct device_node *np;
 
+               id = of_match_node(sfp_of_match, node);
+               if (WARN_ON(!id))
+                       return -EINVAL;
+
+               sff = sfp->type = id->data;
+
                np = of_parse_phandle(node, "i2c-bus", 0);
                if (np) {
                        struct i2c_adapter *i2c;
@@ -834,17 +885,22 @@ static int sfp_probe(struct platform_device *pdev)
                                return err;
                        }
                }
+       }
 
-               for (i = 0; i < GPIO_MAX; i++) {
+       for (i = 0; i < GPIO_MAX; i++)
+               if (sff->gpios & BIT(i)) {
                        sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
                                           gpio_of_names[i], gpio_flags[i]);
                        if (IS_ERR(sfp->gpio[i]))
                                return PTR_ERR(sfp->gpio[i]);
                }
 
-               sfp->get_state = sfp_gpio_get_state;
-               sfp->set_state = sfp_gpio_set_state;
-       }
+       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;
 
        sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
        if (!sfp->sfp_bus)
@@ -899,12 +955,6 @@ static int sfp_remove(struct platform_device *pdev)
        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,

diff --git a/include/linux/sfp.h b/include/linux/sfp.h
index 47ea32d..0c5c5f6 100644 (file)
--- a/include/linux/sfp.h
+++ b/include/linux/sfp.h
@@ -231,6 +231,7 @@ enum {
        SFP_SFF8472_COMPLIANCE          = 0x5e,
        SFP_CC_EXT                      = 0x5f,
 
+       SFP_PHYS_ID_SFF                 = 0x02,
        SFP_PHYS_ID_SFP                 = 0x03,
        SFP_PHYS_EXT_ID_SFP             = 0x04,
        SFP_CONNECTOR_UNSPEC            = 0x00,