[mirror_ubuntu-bionic-kernel.git] / drivers / net / phy / sfp-bus.c

#include <linux/export.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/phylink.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>

#include "sfp.h"

struct sfp_bus {
	struct kref kref;
	struct list_head node;
	struct device_node *device_node;

	const struct sfp_socket_ops *socket_ops;
	struct device *sfp_dev;
	struct sfp *sfp;

	const struct sfp_upstream_ops *upstream_ops;
	void *upstream;
	struct net_device *netdev;
	struct phy_device *phydev;

	bool registered;
	bool started;
};

int sfp_parse_port(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
		   unsigned long *support)
{
	int port;

	/* port is the physical connector, set this from the connector field. */
	switch (id->base.connector) {
	case SFP_CONNECTOR_SC:
	case SFP_CONNECTOR_FIBERJACK:
	case SFP_CONNECTOR_LC:
	case SFP_CONNECTOR_MT_RJ:
	case SFP_CONNECTOR_MU:
	case SFP_CONNECTOR_OPTICAL_PIGTAIL:
		if (support)
			phylink_set(support, FIBRE);
		port = PORT_FIBRE;
		break;

	case SFP_CONNECTOR_RJ45:
		if (support)
			phylink_set(support, TP);
		port = PORT_TP;
		break;

	case SFP_CONNECTOR_UNSPEC:
		if (id->base.e1000_base_t) {
			if (support)
				phylink_set(support, TP);
			port = PORT_TP;
			break;
		}
		/* fallthrough */
	case SFP_CONNECTOR_SG: /* guess */
	case SFP_CONNECTOR_MPO_1X12:
	case SFP_CONNECTOR_MPO_2X16:
	case SFP_CONNECTOR_HSSDC_II:
	case SFP_CONNECTOR_COPPER_PIGTAIL:
	case SFP_CONNECTOR_NOSEPARATE:
	case SFP_CONNECTOR_MXC_2X16:
		port = PORT_OTHER;
		break;
	default:
		dev_warn(bus->sfp_dev, "SFP: unknown connector id 0x%02x\n",
			 id->base.connector);
		port = PORT_OTHER;
		break;
	}

	return port;
}
EXPORT_SYMBOL_GPL(sfp_parse_port);

phy_interface_t sfp_parse_interface(struct sfp_bus *bus,
				    const struct sfp_eeprom_id *id)
{
	phy_interface_t iface;

	/* Setting the serdes link mode is guesswork: there's no field in
	 * the EEPROM which indicates what mode should be used.
	 *
	 * If the module wants 64b66b, then it must be >= 10G.
	 *
	 * 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).
	 */
	switch (id->base.encoding) {
	case SFP_ENCODING_8472_64B66B:
		iface = PHY_INTERFACE_MODE_10GKR;
		break;

	case SFP_ENCODING_8B10B:
		if (!id->base.e1000_base_t &&
		    !id->base.e100_base_lx &&
		    !id->base.e100_base_fx)
			iface = PHY_INTERFACE_MODE_1000BASEX;
		else
			iface = PHY_INTERFACE_MODE_SGMII;
		break;

	default:
		iface = PHY_INTERFACE_MODE_NA;
		dev_err(bus->sfp_dev,
			"SFP module encoding does not support 8b10b nor 64b66b\n");
		break;
	}

	return iface;
}
EXPORT_SYMBOL_GPL(sfp_parse_interface);

void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
		       unsigned long *support)
{
	phylink_set(support, Autoneg);
	phylink_set(support, Pause);
	phylink_set(support, Asym_Pause);

	/* Set ethtool support from the compliance fields. */
	if (id->base.e10g_base_sr)
		phylink_set(support, 10000baseSR_Full);
	if (id->base.e10g_base_lr)
		phylink_set(support, 10000baseLR_Full);
	if (id->base.e10g_base_lrm)
		phylink_set(support, 10000baseLRM_Full);
	if (id->base.e10g_base_er)
		phylink_set(support, 10000baseER_Full);
	if (id->base.e1000_base_sx ||
	    id->base.e1000_base_lx ||
	    id->base.e1000_base_cx)
		phylink_set(support, 1000baseX_Full);
	if (id->base.e1000_base_t) {
		phylink_set(support, 1000baseT_Half);
		phylink_set(support, 1000baseT_Full);
	}

	switch (id->base.extended_cc) {
	case 0x00: /* Unspecified */
		break;
	case 0x02: /* 100Gbase-SR4 or 25Gbase-SR */
		phylink_set(support, 100000baseSR4_Full);
		phylink_set(support, 25000baseSR_Full);
		break;
	case 0x03: /* 100Gbase-LR4 or 25Gbase-LR */
	case 0x04: /* 100Gbase-ER4 or 25Gbase-ER */
		phylink_set(support, 100000baseLR4_ER4_Full);
		break;
	case 0x0b: /* 100Gbase-CR4 or 25Gbase-CR CA-L */
	case 0x0c: /* 25Gbase-CR CA-S */
	case 0x0d: /* 25Gbase-CR CA-N */
		phylink_set(support, 100000baseCR4_Full);
		phylink_set(support, 25000baseCR_Full);
		break;
	default:
		dev_warn(bus->sfp_dev,
			 "Unknown/unsupported extended compliance code: 0x%02x\n",
			 id->base.extended_cc);
		break;
	}

	/* For fibre channel SFP, derive possible BaseX modes */
	if (id->base.fc_speed_100 ||
	    id->base.fc_speed_200 ||
	    id->base.fc_speed_400) {
		if (id->base.br_nominal >= 31)
			phylink_set(support, 2500baseX_Full);
		if (id->base.br_nominal >= 12)
			phylink_set(support, 1000baseX_Full);
	}

	switch (id->base.connector) {
	case SFP_CONNECTOR_SC:
	case SFP_CONNECTOR_FIBERJACK:
	case SFP_CONNECTOR_LC:
	case SFP_CONNECTOR_MT_RJ:
	case SFP_CONNECTOR_MU:
	case SFP_CONNECTOR_OPTICAL_PIGTAIL:
		break;

	case SFP_CONNECTOR_UNSPEC:
		if (id->base.e1000_base_t)
			break;

	case SFP_CONNECTOR_SG: /* guess */
	case SFP_CONNECTOR_MPO_1X12:
	case SFP_CONNECTOR_MPO_2X16:
	case SFP_CONNECTOR_HSSDC_II:
	case SFP_CONNECTOR_COPPER_PIGTAIL:
	case SFP_CONNECTOR_NOSEPARATE:
	case SFP_CONNECTOR_MXC_2X16:
	default:
		/* a guess at the supported link modes */
		dev_warn(bus->sfp_dev,
			 "Guessing link modes, please report...\n");
		phylink_set(support, 1000baseT_Half);
		phylink_set(support, 1000baseT_Full);
		break;
	}
}
EXPORT_SYMBOL_GPL(sfp_parse_support);

static LIST_HEAD(sfp_buses);
static DEFINE_MUTEX(sfp_mutex);

static const struct sfp_upstream_ops *sfp_get_upstream_ops(struct sfp_bus *bus)
{
	return bus->registered ? bus->upstream_ops : NULL;
}

static struct sfp_bus *sfp_bus_get(struct device_node *np)
{
	struct sfp_bus *sfp, *new, *found = NULL;

	new = kzalloc(sizeof(*new), GFP_KERNEL);

	mutex_lock(&sfp_mutex);

	list_for_each_entry(sfp, &sfp_buses, node) {
		if (sfp->device_node == np) {
			kref_get(&sfp->kref);
			found = sfp;
			break;
		}
	}

	if (!found && new) {
		kref_init(&new->kref);
		new->device_node = np;
		list_add(&new->node, &sfp_buses);
		found = new;
		new = NULL;
	}

	mutex_unlock(&sfp_mutex);

	kfree(new);

	return found;
}

static void sfp_bus_release(struct kref *kref) __releases(sfp_mutex)
{
	struct sfp_bus *bus = container_of(kref, struct sfp_bus, kref);

	list_del(&bus->node);
	mutex_unlock(&sfp_mutex);
	kfree(bus);
}

static void sfp_bus_put(struct sfp_bus *bus)
{
	kref_put_mutex(&bus->kref, sfp_bus_release, &sfp_mutex);
}

static int sfp_register_bus(struct sfp_bus *bus)
{
	const struct sfp_upstream_ops *ops = bus->upstream_ops;
	int ret;

	if (ops) {
		if (ops->link_down)
			ops->link_down(bus->upstream);
		if (ops->connect_phy && bus->phydev) {
			ret = ops->connect_phy(bus->upstream, bus->phydev);
			if (ret)
				return ret;
		}
	}
	if (bus->started)
		bus->socket_ops->start(bus->sfp);
	bus->registered = true;
	return 0;
}

static void sfp_unregister_bus(struct sfp_bus *bus)
{
	const struct sfp_upstream_ops *ops = bus->upstream_ops;

	if (bus->registered) {
		if (bus->started)
			bus->socket_ops->stop(bus->sfp);
		if (bus->phydev && ops && ops->disconnect_phy)
			ops->disconnect_phy(bus->upstream);
	}
	bus->registered = false;
}

int sfp_get_module_info(struct sfp_bus *bus, struct ethtool_modinfo *modinfo)
{
	if (!bus->registered)
		return -ENOIOCTLCMD;
	return bus->socket_ops->module_info(bus->sfp, modinfo);
}
EXPORT_SYMBOL_GPL(sfp_get_module_info);

int sfp_get_module_eeprom(struct sfp_bus *bus, struct ethtool_eeprom *ee,
			  u8 *data)
{
	if (!bus->registered)
		return -ENOIOCTLCMD;
	return bus->socket_ops->module_eeprom(bus->sfp, ee, data);
}
EXPORT_SYMBOL_GPL(sfp_get_module_eeprom);

void sfp_upstream_start(struct sfp_bus *bus)
{
	if (bus->registered)
		bus->socket_ops->start(bus->sfp);
	bus->started = true;
}
EXPORT_SYMBOL_GPL(sfp_upstream_start);

void sfp_upstream_stop(struct sfp_bus *bus)
{
	if (bus->registered)
		bus->socket_ops->stop(bus->sfp);
	bus->started = false;
}
EXPORT_SYMBOL_GPL(sfp_upstream_stop);

struct sfp_bus *sfp_register_upstream(struct device_node *np,
				      struct net_device *ndev, void *upstream,
				      const struct sfp_upstream_ops *ops)
{
	struct sfp_bus *bus = sfp_bus_get(np);
	int ret = 0;

	if (bus) {
		rtnl_lock();
		bus->upstream_ops = ops;
		bus->upstream = upstream;
		bus->netdev = ndev;

		if (bus->sfp)
			ret = sfp_register_bus(bus);
		rtnl_unlock();
	}

	if (ret) {
		sfp_bus_put(bus);
		bus = NULL;
	}

	return bus;
}
EXPORT_SYMBOL_GPL(sfp_register_upstream);

void sfp_unregister_upstream(struct sfp_bus *bus)
{
	rtnl_lock();
	if (bus->sfp)
		sfp_unregister_bus(bus);
	bus->upstream = NULL;
	bus->netdev = NULL;
	rtnl_unlock();

	sfp_bus_put(bus);
}
EXPORT_SYMBOL_GPL(sfp_unregister_upstream);

/* Socket driver entry points */
int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev)
{
	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	int ret = 0;

	if (ops && ops->connect_phy)
		ret = ops->connect_phy(bus->upstream, phydev);

	if (ret == 0)
		bus->phydev = phydev;

	return ret;
}
EXPORT_SYMBOL_GPL(sfp_add_phy);

void sfp_remove_phy(struct sfp_bus *bus)
{
	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);

	if (ops && ops->disconnect_phy)
		ops->disconnect_phy(bus->upstream);
	bus->phydev = NULL;
}
EXPORT_SYMBOL_GPL(sfp_remove_phy);

void sfp_link_up(struct sfp_bus *bus)
{
	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);

	if (ops && ops->link_up)
		ops->link_up(bus->upstream);
}
EXPORT_SYMBOL_GPL(sfp_link_up);

void sfp_link_down(struct sfp_bus *bus)
{
	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);

	if (ops && ops->link_down)
		ops->link_down(bus->upstream);
}
EXPORT_SYMBOL_GPL(sfp_link_down);

int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id)
{
	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	int ret = 0;

	if (ops && ops->module_insert)
		ret = ops->module_insert(bus->upstream, id);

	return ret;
}
EXPORT_SYMBOL_GPL(sfp_module_insert);

void sfp_module_remove(struct sfp_bus *bus)
{
	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);

	if (ops && ops->module_remove)
		ops->module_remove(bus->upstream);
}
EXPORT_SYMBOL_GPL(sfp_module_remove);

struct sfp_bus *sfp_register_socket(struct device *dev, struct sfp *sfp,
				    const struct sfp_socket_ops *ops)
{
	struct sfp_bus *bus = sfp_bus_get(dev->of_node);
	int ret = 0;

	if (bus) {
		rtnl_lock();
		bus->sfp_dev = dev;
		bus->sfp = sfp;
		bus->socket_ops = ops;

		if (bus->netdev)
			ret = sfp_register_bus(bus);
		rtnl_unlock();
	}

	if (ret) {
		sfp_bus_put(bus);
		bus = NULL;
	}

	return bus;
}
EXPORT_SYMBOL_GPL(sfp_register_socket);

void sfp_unregister_socket(struct sfp_bus *bus)
{
	rtnl_lock();
	if (bus->netdev)
		sfp_unregister_bus(bus);
	bus->sfp_dev = NULL;
	bus->sfp = NULL;
	bus->socket_ops = NULL;
	rtnl_unlock();

	sfp_bus_put(bus);
}
EXPORT_SYMBOL_GPL(sfp_unregister_socket);
Commit	Line	Data
ce0aa27f RK	1	#include <linux/export.h>
	2	#include <linux/kref.h>
	3	#include <linux/list.h>
	4	#include <linux/mutex.h>
	5	#include <linux/phylink.h>
	6	#include <linux/rtnetlink.h>
	7	#include <linux/slab.h>
	8
	9	#include "sfp.h"
	10
	11	struct sfp_bus {
	12	struct kref kref;
	13	struct list_head node;
	14	struct device_node *device_node;
	15
	16	const struct sfp_socket_ops *socket_ops;
	17	struct device *sfp_dev;
	18	struct sfp *sfp;
	19
	20	const struct sfp_upstream_ops *upstream_ops;
	21	void *upstream;
	22	struct net_device *netdev;
	23	struct phy_device *phydev;
	24
	25	bool registered;
	26	bool started;
	27	};
	28
ce0aa27f RK	29	int sfp_parse_port(struct sfp_bus bus, const struct sfp_eeprom_id id,
	30	unsigned long *support)
	31	{
	32	int port;
	33
	34	/* port is the physical connector, set this from the connector field. */
	35	switch (id->base.connector) {
	36	case SFP_CONNECTOR_SC:
	37	case SFP_CONNECTOR_FIBERJACK:
	38	case SFP_CONNECTOR_LC:
	39	case SFP_CONNECTOR_MT_RJ:
	40	case SFP_CONNECTOR_MU:
	41	case SFP_CONNECTOR_OPTICAL_PIGTAIL:
	42	if (support)
	43	phylink_set(support, FIBRE);
	44	port = PORT_FIBRE;
	45	break;
	46
	47	case SFP_CONNECTOR_RJ45:
	48	if (support)
	49	phylink_set(support, TP);
	50	port = PORT_TP;
	51	break;
	52
	53	case SFP_CONNECTOR_UNSPEC:
	54	if (id->base.e1000_base_t) {
	55	if (support)
	56	phylink_set(support, TP);
	57	port = PORT_TP;
	58	break;
	59	}
	60	/* fallthrough */
	61	case SFP_CONNECTOR_SG: /* guess */
	62	case SFP_CONNECTOR_MPO_1X12:
	63	case SFP_CONNECTOR_MPO_2X16:
	64	case SFP_CONNECTOR_HSSDC_II:
	65	case SFP_CONNECTOR_COPPER_PIGTAIL:
	66	case SFP_CONNECTOR_NOSEPARATE:
	67	case SFP_CONNECTOR_MXC_2X16:
	68	port = PORT_OTHER;
	69	break;
	70	default:
	71	dev_warn(bus->sfp_dev, "SFP: unknown connector id 0x%02x\n",
	72	id->base.connector);
	73	port = PORT_OTHER;
	74	break;
	75	}
	76
	77	return port;
	78	}
	79	EXPORT_SYMBOL_GPL(sfp_parse_port);
	80
	81	phy_interface_t sfp_parse_interface(struct sfp_bus *bus,
	82	const struct sfp_eeprom_id *id)
	83	{
	84	phy_interface_t iface;
	85
	86	/* Setting the serdes link mode is guesswork: there's no field in
	87	* the EEPROM which indicates what mode should be used.
	88	*
	89	* If the module wants 64b66b, then it must be >= 10G.
	90	*
	91	* If it's a gigabit-only fiber module, it probably does not have
	92	* a PHY, so switch to 802.3z negotiation mode. Otherwise, switch
93	* to SGMII mode (which is required to support non-gigabit speeds).
94	*/
95	switch (id->base.encoding) {
96	case SFP_ENCODING_8472_64B66B:
97	iface = PHY_INTERFACE_MODE_10GKR;
98	break;
99
100	case SFP_ENCODING_8B10B:
101	if (!id->base.e1000_base_t &&
102	!id->base.e100_base_lx &&
103	!id->base.e100_base_fx)
104	iface = PHY_INTERFACE_MODE_1000BASEX;
105	else
106	iface = PHY_INTERFACE_MODE_SGMII;
107	break;
108
109	default:
110	iface = PHY_INTERFACE_MODE_NA;
111	dev_err(bus->sfp_dev,
112	"SFP module encoding does not support 8b10b nor 64b66b\n");
113	break;
114	}
115
116	return iface;
117	}
118	EXPORT_SYMBOL_GPL(sfp_parse_interface);
119
120	void sfp_parse_support(struct sfp_bus bus, const struct sfp_eeprom_id id,
121	unsigned long *support)
122	{
123	phylink_set(support, Autoneg);
124	phylink_set(support, Pause);
125	phylink_set(support, Asym_Pause);
126
127	/* Set ethtool support from the compliance fields. */
128	if (id->base.e10g_base_sr)
129	phylink_set(support, 10000baseSR_Full);
130	if (id->base.e10g_base_lr)
131	phylink_set(support, 10000baseLR_Full);
132	if (id->base.e10g_base_lrm)
133	phylink_set(support, 10000baseLRM_Full);
134	if (id->base.e10g_base_er)
135	phylink_set(support, 10000baseER_Full);
136	if (id->base.e1000_base_sx \|\|
137	id->base.e1000_base_lx \|\|
138	id->base.e1000_base_cx)
139	phylink_set(support, 1000baseX_Full);
140	if (id->base.e1000_base_t) {
141	phylink_set(support, 1000baseT_Half);
142	phylink_set(support, 1000baseT_Full);
143	}
144
145	switch (id->base.extended_cc) {
146	case 0x00: /* Unspecified */
147	break;
148	case 0x02: /* 100Gbase-SR4 or 25Gbase-SR */
149	phylink_set(support, 100000baseSR4_Full);
150	phylink_set(support, 25000baseSR_Full);
151	break;
152	case 0x03: /* 100Gbase-LR4 or 25Gbase-LR */
153	case 0x04: /* 100Gbase-ER4 or 25Gbase-ER */
154	phylink_set(support, 100000baseLR4_ER4_Full);
155	break;
156	case 0x0b: /* 100Gbase-CR4 or 25Gbase-CR CA-L */
157	case 0x0c: /* 25Gbase-CR CA-S */
158	case 0x0d: /* 25Gbase-CR CA-N */
159	phylink_set(support, 100000baseCR4_Full);
160	phylink_set(support, 25000baseCR_Full);
161	break;
162	default:
163	dev_warn(bus->sfp_dev,
164	"Unknown/unsupported extended compliance code: 0x%02x\n",
165	id->base.extended_cc);
166	break;
167	}
168
169	/* For fibre channel SFP, derive possible BaseX modes */
170	if (id->base.fc_speed_100 \|\|
171	id->base.fc_speed_200 \|\|
172	id->base.fc_speed_400) {
173	if (id->base.br_nominal >= 31)
174	phylink_set(support, 2500baseX_Full);
175	if (id->base.br_nominal >= 12)
176	phylink_set(support, 1000baseX_Full);
177	}
178
179	switch (id->base.connector) {
180	case SFP_CONNECTOR_SC:
181	case SFP_CONNECTOR_FIBERJACK:
182	case SFP_CONNECTOR_LC:
183	case SFP_CONNECTOR_MT_RJ:
184	case SFP_CONNECTOR_MU:
185	case SFP_CONNECTOR_OPTICAL_PIGTAIL:
186	break;
187
188	case SFP_CONNECTOR_UNSPEC:
189	if (id->base.e1000_base_t)
190	break;
191
192	case SFP_CONNECTOR_SG: /* guess */
193	case SFP_CONNECTOR_MPO_1X12:
194	case SFP_CONNECTOR_MPO_2X16:
195	case SFP_CONNECTOR_HSSDC_II:
196	case SFP_CONNECTOR_COPPER_PIGTAIL:
197	case SFP_CONNECTOR_NOSEPARATE:
198	case SFP_CONNECTOR_MXC_2X16:
199	default:
200	/* a guess at the supported link modes */
201	dev_warn(bus->sfp_dev,
202	"Guessing link modes, please report...\n");
203	phylink_set(support, 1000baseT_Half);
204	phylink_set(support, 1000baseT_Full);
205	break;
206	}
207	}
208	EXPORT_SYMBOL_GPL(sfp_parse_support);
209
ce0aa27f RK	210	static LIST_HEAD(sfp_buses);
	211	static DEFINE_MUTEX(sfp_mutex);
	212
	213	static const struct sfp_upstream_ops sfp_get_upstream_ops(struct sfp_bus bus)
	214	{
	215	return bus->registered ? bus->upstream_ops : NULL;
	216	}
	217
	218	static struct sfp_bus sfp_bus_get(struct device_node np)
	219	{
	220	struct sfp_bus sfp, new, *found = NULL;
	221
	222	new = kzalloc(sizeof(*new), GFP_KERNEL);
	223
	224	mutex_lock(&sfp_mutex);
	225
	226	list_for_each_entry(sfp, &sfp_buses, node) {
	227	if (sfp->device_node == np) {
	228	kref_get(&sfp->kref);
	229	found = sfp;
	230	break;
	231	}
	232	}
	233
	234	if (!found && new) {
	235	kref_init(&new->kref);
	236	new->device_node = np;
	237	list_add(&new->node, &sfp_buses);
	238	found = new;
	239	new = NULL;
	240	}
	241
	242	mutex_unlock(&sfp_mutex);
	243
	244	kfree(new);
	245
	246	return found;
	247	}
	248
	249	static void sfp_bus_release(struct kref *kref) __releases(sfp_mutex)
	250	{
	251	struct sfp_bus *bus = container_of(kref, struct sfp_bus, kref);
	252
	253	list_del(&bus->node);
	254	mutex_unlock(&sfp_mutex);
	255	kfree(bus);
	256	}
	257
	258	static void sfp_bus_put(struct sfp_bus *bus)
	259	{
	260	kref_put_mutex(&bus->kref, sfp_bus_release, &sfp_mutex);
	261	}
	262
	263	static int sfp_register_bus(struct sfp_bus *bus)
	264	{
	265	const struct sfp_upstream_ops *ops = bus->upstream_ops;
	266	int ret;
	267
	268	if (ops) {
	269	if (ops->link_down)
	270	ops->link_down(bus->upstream);
	271	if (ops->connect_phy && bus->phydev) {
	272	ret = ops->connect_phy(bus->upstream, bus->phydev);
	273	if (ret)
274	return ret;
275	}
276	}
277	if (bus->started)
278	bus->socket_ops->start(bus->sfp);
279	bus->registered = true;
280	return 0;
281	}
282
283	static void sfp_unregister_bus(struct sfp_bus *bus)
284	{
285	const struct sfp_upstream_ops *ops = bus->upstream_ops;
286
287	if (bus->registered) {
288	if (bus->started)
289	bus->socket_ops->stop(bus->sfp);
290	if (bus->phydev && ops && ops->disconnect_phy)
291	ops->disconnect_phy(bus->upstream);
292	}
293	bus->registered = false;
294	}
295
ce0aa27f RK	296	int sfp_get_module_info(struct sfp_bus bus, struct ethtool_modinfo modinfo)
	297	{
	298	if (!bus->registered)
	299	return -ENOIOCTLCMD;
	300	return bus->socket_ops->module_info(bus->sfp, modinfo);
	301	}
	302	EXPORT_SYMBOL_GPL(sfp_get_module_info);
	303
	304	int sfp_get_module_eeprom(struct sfp_bus bus, struct ethtool_eeprom ee,
516b29ed	305	u8 *data)
ce0aa27f RK	306	{
	307	if (!bus->registered)
	308	return -ENOIOCTLCMD;
	309	return bus->socket_ops->module_eeprom(bus->sfp, ee, data);
	310	}
	311	EXPORT_SYMBOL_GPL(sfp_get_module_eeprom);
	312
	313	void sfp_upstream_start(struct sfp_bus *bus)
	314	{
	315	if (bus->registered)
	316	bus->socket_ops->start(bus->sfp);
	317	bus->started = true;
	318	}
	319	EXPORT_SYMBOL_GPL(sfp_upstream_start);
	320
	321	void sfp_upstream_stop(struct sfp_bus *bus)
	322	{
	323	if (bus->registered)
	324	bus->socket_ops->stop(bus->sfp);
	325	bus->started = false;
	326	}
	327	EXPORT_SYMBOL_GPL(sfp_upstream_stop);
	328
	329	struct sfp_bus sfp_register_upstream(struct device_node np,
516b29ed FF	330	struct net_device ndev, void upstream,
516b29ed FF	331	const struct sfp_upstream_ops *ops)
ce0aa27f RK	332	{
	333	struct sfp_bus *bus = sfp_bus_get(np);
	334	int ret = 0;
	335
	336	if (bus) {
	337	rtnl_lock();
	338	bus->upstream_ops = ops;
	339	bus->upstream = upstream;
	340	bus->netdev = ndev;
	341
	342	if (bus->sfp)
	343	ret = sfp_register_bus(bus);
	344	rtnl_unlock();
	345	}
	346
	347	if (ret) {
	348	sfp_bus_put(bus);
	349	bus = NULL;
	350	}
	351
	352	return bus;
	353	}
	354	EXPORT_SYMBOL_GPL(sfp_register_upstream);
	355
	356	void sfp_unregister_upstream(struct sfp_bus *bus)
	357	{
	358	rtnl_lock();
0b2122e4 RK	359	if (bus->sfp)
0b2122e4 RK	360	sfp_unregister_bus(bus);
ce0aa27f RK	361	bus->upstream = NULL;
	362	bus->netdev = NULL;
	363	rtnl_unlock();
	364
	365	sfp_bus_put(bus);
	366	}
	367	EXPORT_SYMBOL_GPL(sfp_unregister_upstream);
	368
ce0aa27f RK	369	/* Socket driver entry points */
	370	int sfp_add_phy(struct sfp_bus bus, struct phy_device phydev)
	371	{
	372	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	373	int ret = 0;
	374
	375	if (ops && ops->connect_phy)
	376	ret = ops->connect_phy(bus->upstream, phydev);
	377
	378	if (ret == 0)
	379	bus->phydev = phydev;
	380
	381	return ret;
	382	}
	383	EXPORT_SYMBOL_GPL(sfp_add_phy);
	384
	385	void sfp_remove_phy(struct sfp_bus *bus)
	386	{
	387	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	388
	389	if (ops && ops->disconnect_phy)
	390	ops->disconnect_phy(bus->upstream);
	391	bus->phydev = NULL;
	392	}
	393	EXPORT_SYMBOL_GPL(sfp_remove_phy);
	394
ce0aa27f RK	395	void sfp_link_up(struct sfp_bus *bus)
	396	{
	397	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	398
	399	if (ops && ops->link_up)
	400	ops->link_up(bus->upstream);
	401	}
	402	EXPORT_SYMBOL_GPL(sfp_link_up);
	403
	404	void sfp_link_down(struct sfp_bus *bus)
	405	{
	406	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	407
	408	if (ops && ops->link_down)
	409	ops->link_down(bus->upstream);
	410	}
	411	EXPORT_SYMBOL_GPL(sfp_link_down);
	412
	413	int sfp_module_insert(struct sfp_bus bus, const struct sfp_eeprom_id id)
	414	{
	415	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	416	int ret = 0;
	417
	418	if (ops && ops->module_insert)
	419	ret = ops->module_insert(bus->upstream, id);
	420
	421	return ret;
	422	}
	423	EXPORT_SYMBOL_GPL(sfp_module_insert);
	424
	425	void sfp_module_remove(struct sfp_bus *bus)
	426	{
	427	const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
	428
	429	if (ops && ops->module_remove)
	430	ops->module_remove(bus->upstream);
	431	}
	432	EXPORT_SYMBOL_GPL(sfp_module_remove);
	433
	434	struct sfp_bus sfp_register_socket(struct device dev, struct sfp *sfp,
	435	const struct sfp_socket_ops *ops)
	436	{
	437	struct sfp_bus *bus = sfp_bus_get(dev->of_node);
	438	int ret = 0;
	439
	440	if (bus) {
	441	rtnl_lock();
	442	bus->sfp_dev = dev;
	443	bus->sfp = sfp;
	444	bus->socket_ops = ops;
	445
	446	if (bus->netdev)
	447	ret = sfp_register_bus(bus);
	448	rtnl_unlock();
	449	}
	450
	451	if (ret) {
	452	sfp_bus_put(bus);
	453	bus = NULL;
	454	}
	455
	456	return bus;
	457	}
	458	EXPORT_SYMBOL_GPL(sfp_register_socket);
459
460	void sfp_unregister_socket(struct sfp_bus *bus)
461	{
462	rtnl_lock();
0b2122e4 RK	463	if (bus->netdev)
0b2122e4 RK	464	sfp_unregister_bus(bus);
ce0aa27f RK	465	bus->sfp_dev = NULL;
	466	bus->sfp = NULL;
	467	bus->socket_ops = NULL;
	468	rtnl_unlock();
	469
	470	sfp_bus_put(bus);
	471	}
	472	EXPORT_SYMBOL_GPL(sfp_unregister_socket);