blob: 27a05167c18c3bf80d7bd54622a33a8a749ae96e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016-2017, Linaro Ltd
*/
#include <linux/idr.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rpmsg.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/mailbox_client.h>
#include "rpmsg_internal.h"
#include "qcom_glink_native.h"
#define GLINK_NAME_SIZE 32
#define GLINK_VERSION_1 1
#define RPM_GLINK_CID_MIN 1
#define RPM_GLINK_CID_MAX 65536
struct glink_msg {
__le16 cmd;
__le16 param1;
__le32 param2;
u8 data[];
} __packed;
/**
* struct glink_defer_cmd - deferred incoming control message
* @node: list node
* @msg: message header
* @data: payload of the message
*
* Copy of a received control message, to be added to @rx_queue and processed
* by @rx_work of @qcom_glink.
*/
struct glink_defer_cmd {
struct list_head node;
struct glink_msg msg;
u8 data[];
};
/**
* struct glink_core_rx_intent - RX intent
* RX intent
*
* @data: pointer to the data (may be NULL for zero-copy)
* @id: remote or local intent ID
* @size: size of the original intent (do not modify)
* @reuse: To mark if the intent can be reused after first use
* @in_use: To mark if intent is already in use for the channel
* @offset: next write offset (initially 0)
* @node: list node
*/
struct glink_core_rx_intent {
void *data;
u32 id;
size_t size;
bool reuse;
bool in_use;
u32 offset;
struct list_head node;
};
/**
* struct qcom_glink - driver context, relates to one remote subsystem
* @dev: reference to the associated struct device
* @mbox_client: mailbox client
* @mbox_chan: mailbox channel
* @rx_pipe: pipe object for receive FIFO
* @tx_pipe: pipe object for transmit FIFO
* @irq: IRQ for signaling incoming events
* @rx_work: worker for handling received control messages
* @rx_lock: protects the @rx_queue
* @rx_queue: queue of received control messages to be processed in @rx_work
* @tx_lock: synchronizes operations on the tx fifo
* @idr_lock: synchronizes @lcids and @rcids modifications
* @lcids: idr of all channels with a known local channel id
* @rcids: idr of all channels with a known remote channel id
* @features: remote features
* @intentless: flag to indicate that there is no intent
*/
struct qcom_glink {
struct device *dev;
const char *name;
struct mbox_client mbox_client;
struct mbox_chan *mbox_chan;
struct qcom_glink_pipe *rx_pipe;
struct qcom_glink_pipe *tx_pipe;
int irq;
struct work_struct rx_work;
spinlock_t rx_lock;
struct list_head rx_queue;
spinlock_t tx_lock;
spinlock_t idr_lock;
struct idr lcids;
struct idr rcids;
unsigned long features;
bool intentless;
};
enum {
GLINK_STATE_CLOSED,
GLINK_STATE_OPENING,
GLINK_STATE_OPEN,
GLINK_STATE_CLOSING,
};
/**
* struct glink_channel - internal representation of a channel
* @rpdev: rpdev reference, only used for primary endpoints
* @ept: rpmsg endpoint this channel is associated with
* @glink: qcom_glink context handle
* @refcount: refcount for the channel object
* @recv_lock: guard for @ept.cb
* @name: unique channel name/identifier
* @lcid: channel id, in local space
* @rcid: channel id, in remote space
* @intent_lock: lock for protection of @liids, @riids
* @liids: idr of all local intents
* @riids: idr of all remote intents
* @intent_work: worker responsible for transmitting rx_done packets
* @done_intents: list of intents that needs to be announced rx_done
* @buf: receive buffer, for gathering fragments
* @buf_offset: write offset in @buf
* @buf_size: size of current @buf
* @open_ack: completed once remote has acked the open-request
* @open_req: completed once open-request has been received
* @intent_req_lock: Synchronises multiple intent requests
* @intent_req_result: Result of intent request
* @intent_req_comp: Completion for intent_req signalling
*/
struct glink_channel {
struct rpmsg_endpoint ept;
struct rpmsg_device *rpdev;
struct qcom_glink *glink;
struct kref refcount;
spinlock_t recv_lock;
char *name;
unsigned int lcid;
unsigned int rcid;
spinlock_t intent_lock;
struct idr liids;
struct idr riids;
struct work_struct intent_work;
struct list_head done_intents;
struct glink_core_rx_intent *buf;
int buf_offset;
int buf_size;
struct completion open_ack;
struct completion open_req;
struct mutex intent_req_lock;
bool intent_req_result;
struct completion intent_req_comp;
};
#define to_glink_channel(_ept) container_of(_ept, struct glink_channel, ept)
static const struct rpmsg_endpoint_ops glink_endpoint_ops;
#define RPM_CMD_VERSION 0
#define RPM_CMD_VERSION_ACK 1
#define RPM_CMD_OPEN 2
#define RPM_CMD_CLOSE 3
#define RPM_CMD_OPEN_ACK 4
#define RPM_CMD_INTENT 5
#define RPM_CMD_RX_DONE 6
#define RPM_CMD_RX_INTENT_REQ 7
#define RPM_CMD_RX_INTENT_REQ_ACK 8
#define RPM_CMD_TX_DATA 9
#define RPM_CMD_CLOSE_ACK 11
#define RPM_CMD_TX_DATA_CONT 12
#define RPM_CMD_READ_NOTIF 13
#define RPM_CMD_RX_DONE_W_REUSE 14
#define GLINK_FEATURE_INTENTLESS BIT(1)
static void qcom_glink_rx_done_work(struct work_struct *work);
static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
const char *name)
{
struct glink_channel *channel;
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
return ERR_PTR(-ENOMEM);
/* Setup glink internal glink_channel data */
spin_lock_init(&channel->recv_lock);
spin_lock_init(&channel->intent_lock);
mutex_init(&channel->intent_req_lock);
channel->glink = glink;
channel->name = kstrdup(name, GFP_KERNEL);
init_completion(&channel->open_req);
init_completion(&channel->open_ack);
init_completion(&channel->intent_req_comp);
INIT_LIST_HEAD(&channel->done_intents);
INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
idr_init(&channel->liids);
idr_init(&channel->riids);
kref_init(&channel->refcount);
return channel;
}
static void qcom_glink_channel_release(struct kref *ref)
{
struct glink_channel *channel = container_of(ref, struct glink_channel,
refcount);
struct glink_core_rx_intent *intent;
struct glink_core_rx_intent *tmp;
unsigned long flags;
int iid;
/* cancel pending rx_done work */
cancel_work_sync(&channel->intent_work);
spin_lock_irqsave(&channel->intent_lock, flags);
/* Free all non-reuse intents pending rx_done work */
list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
if (!intent->reuse) {
kfree(intent->data);
kfree(intent);
}
}
idr_for_each_entry(&channel->liids, tmp, iid) {
kfree(tmp->data);
kfree(tmp);
}
idr_destroy(&channel->liids);
idr_for_each_entry(&channel->riids, tmp, iid)
kfree(tmp);
idr_destroy(&channel->riids);
spin_unlock_irqrestore(&channel->intent_lock, flags);
kfree(channel->name);
kfree(channel);
}
static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
{
return glink->rx_pipe->avail(glink->rx_pipe);
}
static void qcom_glink_rx_peak(struct qcom_glink *glink,
void *data, unsigned int offset, size_t count)
{
glink->rx_pipe->peak(glink->rx_pipe, data, offset, count);
}
static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
{
glink->rx_pipe->advance(glink->rx_pipe, count);
}
static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
{
return glink->tx_pipe->avail(glink->tx_pipe);
}
static void qcom_glink_tx_write(struct qcom_glink *glink,
const void *hdr, size_t hlen,
const void *data, size_t dlen)
{
glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
}
static int qcom_glink_tx(struct qcom_glink *glink,
const void *hdr, size_t hlen,
const void *data, size_t dlen, bool wait)
{
unsigned int tlen = hlen + dlen;
unsigned long flags;
int ret = 0;
/* Reject packets that are too big */
if (tlen >= glink->tx_pipe->length)
return -EINVAL;
spin_lock_irqsave(&glink->tx_lock, flags);
while (qcom_glink_tx_avail(glink) < tlen) {
if (!wait) {
ret = -EAGAIN;
goto out;
}
/* Wait without holding the tx_lock */
spin_unlock_irqrestore(&glink->tx_lock, flags);
usleep_range(10000, 15000);
spin_lock_irqsave(&glink->tx_lock, flags);
}
qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
mbox_send_message(glink->mbox_chan, NULL);
mbox_client_txdone(glink->mbox_chan, 0);
out:
spin_unlock_irqrestore(&glink->tx_lock, flags);
return ret;
}
static int qcom_glink_send_version(struct qcom_glink *glink)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_VERSION);
msg.param1 = cpu_to_le16(GLINK_VERSION_1);
msg.param2 = cpu_to_le32(glink->features);
return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
static void qcom_glink_send_version_ack(struct qcom_glink *glink)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK);
msg.param1 = cpu_to_le16(GLINK_VERSION_1);
msg.param2 = cpu_to_le32(glink->features);
qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
static void qcom_glink_send_open_ack(struct qcom_glink *glink,
struct glink_channel *channel)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_OPEN_ACK);
msg.param1 = cpu_to_le16(channel->rcid);
msg.param2 = cpu_to_le32(0);
qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
}
static void qcom_glink_handle_intent_req_ack(struct qcom_glink *glink,
unsigned int cid, bool granted)
{
struct glink_channel *channel;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, cid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
dev_err(glink->dev, "unable to find channel\n");
return;
}
channel->intent_req_result = granted;
complete(&channel->intent_req_comp);
}
/**
* qcom_glink_send_open_req() - send a RPM_CMD_OPEN request to the remote
* @glink: Ptr to the glink edge
* @channel: Ptr to the channel that the open req is sent
*
* Allocates a local channel id and sends a RPM_CMD_OPEN message to the remote.
* Will return with refcount held, regardless of outcome.
*
* Returns 0 on success, negative errno otherwise.
*/
static int qcom_glink_send_open_req(struct qcom_glink *glink,
struct glink_channel *channel)
{
struct {
struct glink_msg msg;
u8 name[GLINK_NAME_SIZE];
} __packed req;
int name_len = strlen(channel->name) + 1;
int req_len = ALIGN(sizeof(req.msg) + name_len, 8);
int ret;
unsigned long flags;
kref_get(&channel->refcount);
spin_lock_irqsave(&glink->idr_lock, flags);
ret = idr_alloc_cyclic(&glink->lcids, channel,
RPM_GLINK_CID_MIN, RPM_GLINK_CID_MAX,
GFP_ATOMIC);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (ret < 0)
return ret;
channel->lcid = ret;
req.msg.cmd = cpu_to_le16(RPM_CMD_OPEN);
req.msg.param1 = cpu_to_le16(channel->lcid);
req.msg.param2 = cpu_to_le32(name_len);
strcpy(req.name, channel->name);
ret = qcom_glink_tx(glink, &req, req_len, NULL, 0, true);
if (ret)
goto remove_idr;
return 0;
remove_idr:
spin_lock_irqsave(&glink->idr_lock, flags);
idr_remove(&glink->lcids, channel->lcid);
channel->lcid = 0;
spin_unlock_irqrestore(&glink->idr_lock, flags);
return ret;
}
static void qcom_glink_send_close_req(struct qcom_glink *glink,
struct glink_channel *channel)
{
struct glink_msg req;
req.cmd = cpu_to_le16(RPM_CMD_CLOSE);
req.param1 = cpu_to_le16(channel->lcid);
req.param2 = 0;
qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
}
static void qcom_glink_send_close_ack(struct qcom_glink *glink,
unsigned int rcid)
{
struct glink_msg req;
req.cmd = cpu_to_le16(RPM_CMD_CLOSE_ACK);
req.param1 = cpu_to_le16(rcid);
req.param2 = 0;
qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true);
}
static void qcom_glink_rx_done_work(struct work_struct *work)
{
struct glink_channel *channel = container_of(work, struct glink_channel,
intent_work);
struct qcom_glink *glink = channel->glink;
struct glink_core_rx_intent *intent, *tmp;
struct {
u16 id;
u16 lcid;
u32 liid;
} __packed cmd;
unsigned int cid = channel->lcid;
unsigned int iid;
bool reuse;
unsigned long flags;
spin_lock_irqsave(&channel->intent_lock, flags);
list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) {
list_del(&intent->node);
spin_unlock_irqrestore(&channel->intent_lock, flags);
iid = intent->id;
reuse = intent->reuse;
cmd.id = reuse ? RPM_CMD_RX_DONE_W_REUSE : RPM_CMD_RX_DONE;
cmd.lcid = cid;
cmd.liid = iid;
qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
if (!reuse) {
kfree(intent->data);
kfree(intent);
}
spin_lock_irqsave(&channel->intent_lock, flags);
}
spin_unlock_irqrestore(&channel->intent_lock, flags);
}
static void qcom_glink_rx_done(struct qcom_glink *glink,
struct glink_channel *channel,
struct glink_core_rx_intent *intent)
{
/* We don't send RX_DONE to intentless systems */
if (glink->intentless) {
kfree(intent->data);
kfree(intent);
return;
}
/* Take it off the tree of receive intents */
if (!intent->reuse) {
spin_lock(&channel->intent_lock);
idr_remove(&channel->liids, intent->id);
spin_unlock(&channel->intent_lock);
}
/* Schedule the sending of a rx_done indication */
spin_lock(&channel->intent_lock);
list_add_tail(&intent->node, &channel->done_intents);
spin_unlock(&channel->intent_lock);
schedule_work(&channel->intent_work);
}
/**
* qcom_glink_receive_version() - receive version/features from remote system
*
* @glink: pointer to transport interface
* @version: remote version
* @features: remote features
*
* This function is called in response to a remote-initiated version/feature
* negotiation sequence.
*/
static void qcom_glink_receive_version(struct qcom_glink *glink,
u32 version,
u32 features)
{
switch (version) {
case 0:
break;
case GLINK_VERSION_1:
glink->features &= features;
fallthrough;
default:
qcom_glink_send_version_ack(glink);
break;
}
}
/**
* qcom_glink_receive_version_ack() - receive negotiation ack from remote system
*
* @glink: pointer to transport interface
* @version: remote version response
* @features: remote features response
*
* This function is called in response to a local-initiated version/feature
* negotiation sequence and is the counter-offer from the remote side based
* upon the initial version and feature set requested.
*/
static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
u32 version,
u32 features)
{
switch (version) {
case 0:
/* Version negotiation failed */
break;
case GLINK_VERSION_1:
if (features == glink->features)
break;
glink->features &= features;
fallthrough;
default:
qcom_glink_send_version(glink);
break;
}
}
/**
* qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to
* wire format and transmit
* @glink: The transport to transmit on.
* @channel: The glink channel
* @granted: The request response to encode.
*
* Return: 0 on success or standard Linux error code.
*/
static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink,
struct glink_channel *channel,
bool granted)
{
struct glink_msg msg;
msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK);
msg.param1 = cpu_to_le16(channel->lcid);
msg.param2 = cpu_to_le32(granted);
qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
return 0;
}
/**
* qcom_glink_advertise_intent - convert an rx intent cmd to wire format and
* transmit
* @glink: The transport to transmit on.
* @channel: The local channel
* @intent: The intent to pass on to remote.
*
* Return: 0 on success or standard Linux error code.
*/
static int qcom_glink_advertise_intent(struct qcom_glink *glink,
struct glink_channel *channel,
struct glink_core_rx_intent *intent)
{
struct command {
__le16 id;
__le16 lcid;
__le32 count;
__le32 size;
__le32 liid;
} __packed;
struct command cmd;
cmd.id = cpu_to_le16(RPM_CMD_INTENT);
cmd.lcid = cpu_to_le16(channel->lcid);
cmd.count = cpu_to_le32(1);
cmd.size = cpu_to_le32(intent->size);
cmd.liid = cpu_to_le32(intent->id);
qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
return 0;
}
static struct glink_core_rx_intent *
qcom_glink_alloc_intent(struct qcom_glink *glink,
struct glink_channel *channel,
size_t size,
bool reuseable)
{
struct glink_core_rx_intent *intent;
int ret;
unsigned long flags;
intent = kzalloc(sizeof(*intent), GFP_KERNEL);
if (!intent)
return NULL;
intent->data = kzalloc(size, GFP_KERNEL);
if (!intent->data)
goto free_intent;
spin_lock_irqsave(&channel->intent_lock, flags);
ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
if (ret < 0) {
spin_unlock_irqrestore(&channel->intent_lock, flags);
goto free_data;
}
spin_unlock_irqrestore(&channel->intent_lock, flags);
intent->id = ret;
intent->size = size;
intent->reuse = reuseable;
return intent;
free_data:
kfree(intent->data);
free_intent:
kfree(intent);
return NULL;
}
static void qcom_glink_handle_rx_done(struct qcom_glink *glink,
u32 cid, uint32_t iid,
bool reuse)
{
struct glink_core_rx_intent *intent;
struct glink_channel *channel;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, cid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
dev_err(glink->dev, "invalid channel id received\n");
return;
}
spin_lock_irqsave(&channel->intent_lock, flags);
intent = idr_find(&channel->riids, iid);
if (!intent) {
spin_unlock_irqrestore(&channel->intent_lock, flags);
dev_err(glink->dev, "invalid intent id received\n");
return;
}
intent->in_use = false;
if (!reuse) {
idr_remove(&channel->riids, intent->id);
kfree(intent);
}
spin_unlock_irqrestore(&channel->intent_lock, flags);
}
/**
* qcom_glink_handle_intent_req() - Receive a request for rx_intent
* from remote side
* @glink: Pointer to the transport interface
* @cid: Remote channel ID
* @size: size of the intent
*
* The function searches for the local channel to which the request for
* rx_intent has arrived and allocates and notifies the remote back
*/
static void qcom_glink_handle_intent_req(struct qcom_glink *glink,
u32 cid, size_t size)
{
struct glink_core_rx_intent *intent;
struct glink_channel *channel;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, cid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
pr_err("%s channel not found for cid %d\n", __func__, cid);
return;
}
intent = qcom_glink_alloc_intent(glink, channel, size, false);
if (intent)
qcom_glink_advertise_intent(glink, channel, intent);
qcom_glink_send_intent_req_ack(glink, channel, !!intent);
}
static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
{
struct glink_defer_cmd *dcmd;
extra = ALIGN(extra, 8);
if (qcom_glink_rx_avail(glink) < sizeof(struct glink_msg) + extra) {
dev_dbg(glink->dev, "Insufficient data in rx fifo");
return -ENXIO;
}
dcmd = kzalloc(sizeof(*dcmd) + extra, GFP_ATOMIC);
if (!dcmd)
return -ENOMEM;
INIT_LIST_HEAD(&dcmd->node);
qcom_glink_rx_peak(glink, &dcmd->msg, 0, sizeof(dcmd->msg) + extra);
spin_lock(&glink->rx_lock);
list_add_tail(&dcmd->node, &glink->rx_queue);
spin_unlock(&glink->rx_lock);
schedule_work(&glink->rx_work);
qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
return 0;
}
static int qcom_glink_rx_data(struct qcom_glink *glink, size_t avail)
{
struct glink_core_rx_intent *intent;
struct glink_channel *channel;
struct {
struct glink_msg msg;
__le32 chunk_size;
__le32 left_size;
} __packed hdr;
unsigned int chunk_size;
unsigned int left_size;
unsigned int rcid;
unsigned int liid;
int ret = 0;
unsigned long flags;
if (avail < sizeof(hdr)) {
dev_dbg(glink->dev, "Not enough data in fifo\n");
return -EAGAIN;
}
qcom_glink_rx_peak(glink, &hdr, 0, sizeof(hdr));
chunk_size = le32_to_cpu(hdr.chunk_size);
left_size = le32_to_cpu(hdr.left_size);
if (avail < sizeof(hdr) + chunk_size) {
dev_dbg(glink->dev, "Payload not yet in fifo\n");
return -EAGAIN;
}
rcid = le16_to_cpu(hdr.msg.param1);
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, rcid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
dev_dbg(glink->dev, "Data on non-existing channel\n");
/* Drop the message */
goto advance_rx;
}
if (glink->intentless) {
/* Might have an ongoing, fragmented, message to append */
if (!channel->buf) {
intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
if (!intent)
return -ENOMEM;
intent->data = kmalloc(chunk_size + left_size,
GFP_ATOMIC);
if (!intent->data) {
kfree(intent);
return -ENOMEM;
}
intent->id = 0xbabababa;
intent->size = chunk_size + left_size;
intent->offset = 0;
channel->buf = intent;
} else {
intent = channel->buf;
}
} else {
liid = le32_to_cpu(hdr.msg.param2);
spin_lock_irqsave(&channel->intent_lock, flags);
intent = idr_find(&channel->liids, liid);
spin_unlock_irqrestore(&channel->intent_lock, flags);
if (!intent) {
dev_err(glink->dev,
"no intent found for channel %s intent %d",
channel->name, liid);
goto advance_rx;
}
}
if (intent->size - intent->offset < chunk_size) {
dev_err(glink->dev, "Insufficient space in intent\n");
/* The packet header lied, drop payload */
goto advance_rx;
}
qcom_glink_rx_peak(glink, intent->data + intent->offset,
sizeof(hdr), chunk_size);
intent->offset += chunk_size;
/* Handle message when no fragments remain to be received */
if (!left_size) {
spin_lock(&channel->recv_lock);
if (channel->ept.cb) {
channel->ept.cb(channel->ept.rpdev,
intent->data,
intent->offset,
channel->ept.priv,
RPMSG_ADDR_ANY);
}
spin_unlock(&channel->recv_lock);
intent->offset = 0;
channel->buf = NULL;
qcom_glink_rx_done(glink, channel, intent);
}
advance_rx:
qcom_glink_rx_advance(glink, ALIGN(sizeof(hdr) + chunk_size, 8));
return ret;
}
static void qcom_glink_handle_intent(struct qcom_glink *glink,
unsigned int cid,
unsigned int count,
size_t avail)
{
struct glink_core_rx_intent *intent;
struct glink_channel *channel;
struct intent_pair {
__le32 size;
__le32 iid;
};
struct {
struct glink_msg msg;
struct intent_pair intents[];
} __packed * msg;
const size_t msglen = struct_size(msg, intents, count);
int ret;
int i;
unsigned long flags;
if (avail < msglen) {
dev_dbg(glink->dev, "Not enough data in fifo\n");
return;
}
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, cid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
dev_err(glink->dev, "intents for non-existing channel\n");
return;
}
msg = kmalloc(msglen, GFP_ATOMIC);
if (!msg)
return;
qcom_glink_rx_peak(glink, msg, 0, msglen);
for (i = 0; i < count; ++i) {
intent = kzalloc(sizeof(*intent), GFP_ATOMIC);
if (!intent)
break;
intent->id = le32_to_cpu(msg->intents[i].iid);
intent->size = le32_to_cpu(msg->intents[i].size);
spin_lock_irqsave(&channel->intent_lock, flags);
ret = idr_alloc(&channel->riids, intent,
intent->id, intent->id + 1, GFP_ATOMIC);
spin_unlock_irqrestore(&channel->intent_lock, flags);
if (ret < 0)
dev_err(glink->dev, "failed to store remote intent\n");
}
kfree(msg);
qcom_glink_rx_advance(glink, ALIGN(msglen, 8));
}
static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid)
{
struct glink_channel *channel;
spin_lock(&glink->idr_lock);
channel = idr_find(&glink->lcids, lcid);
spin_unlock(&glink->idr_lock);
if (!channel) {
dev_err(glink->dev, "Invalid open ack packet\n");
return -EINVAL;
}
complete_all(&channel->open_ack);
return 0;
}
static irqreturn_t qcom_glink_native_intr(int irq, void *data)
{
struct qcom_glink *glink = data;
struct glink_msg msg;
unsigned int param1;
unsigned int param2;
unsigned int avail;
unsigned int cmd;
int ret = 0;
for (;;) {
avail = qcom_glink_rx_avail(glink);
if (avail < sizeof(msg))
break;
qcom_glink_rx_peak(glink, &msg, 0, sizeof(msg));
cmd = le16_to_cpu(msg.cmd);
param1 = le16_to_cpu(msg.param1);
param2 = le32_to_cpu(msg.param2);
switch (cmd) {
case RPM_CMD_VERSION:
case RPM_CMD_VERSION_ACK:
case RPM_CMD_CLOSE:
case RPM_CMD_CLOSE_ACK:
case RPM_CMD_RX_INTENT_REQ:
ret = qcom_glink_rx_defer(glink, 0);
break;
case RPM_CMD_OPEN_ACK:
ret = qcom_glink_rx_open_ack(glink, param1);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
case RPM_CMD_OPEN:
ret = qcom_glink_rx_defer(glink, param2);
break;
case RPM_CMD_TX_DATA:
case RPM_CMD_TX_DATA_CONT:
ret = qcom_glink_rx_data(glink, avail);
break;
case RPM_CMD_READ_NOTIF:
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
mbox_send_message(glink->mbox_chan, NULL);
mbox_client_txdone(glink->mbox_chan, 0);
break;
case RPM_CMD_INTENT:
qcom_glink_handle_intent(glink, param1, param2, avail);
break;
case RPM_CMD_RX_DONE:
qcom_glink_handle_rx_done(glink, param1, param2, false);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
case RPM_CMD_RX_DONE_W_REUSE:
qcom_glink_handle_rx_done(glink, param1, param2, true);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
case RPM_CMD_RX_INTENT_REQ_ACK:
qcom_glink_handle_intent_req_ack(glink, param1, param2);
qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8));
break;
default:
dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd);
ret = -EINVAL;
break;
}
if (ret)
break;
}
return IRQ_HANDLED;
}
/* Locally initiated rpmsg_create_ept */
static struct glink_channel *qcom_glink_create_local(struct qcom_glink *glink,
const char *name)
{
struct glink_channel *channel;
int ret;
unsigned long flags;
channel = qcom_glink_alloc_channel(glink, name);
if (IS_ERR(channel))
return ERR_CAST(channel);
ret = qcom_glink_send_open_req(glink, channel);
if (ret)
goto release_channel;
ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
if (!ret)
goto err_timeout;
ret = wait_for_completion_timeout(&channel->open_req, 5 * HZ);
if (!ret)
goto err_timeout;
qcom_glink_send_open_ack(glink, channel);
return channel;
err_timeout:
/* qcom_glink_send_open_req() did register the channel in lcids*/
spin_lock_irqsave(&glink->idr_lock, flags);
idr_remove(&glink->lcids, channel->lcid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
release_channel:
/* Release qcom_glink_send_open_req() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
/* Release qcom_glink_alloc_channel() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
return ERR_PTR(-ETIMEDOUT);
}
/* Remote initiated rpmsg_create_ept */
static int qcom_glink_create_remote(struct qcom_glink *glink,
struct glink_channel *channel)
{
int ret;
qcom_glink_send_open_ack(glink, channel);
ret = qcom_glink_send_open_req(glink, channel);
if (ret)
goto close_link;
ret = wait_for_completion_timeout(&channel->open_ack, 5 * HZ);
if (!ret) {
ret = -ETIMEDOUT;
goto close_link;
}
return 0;
close_link:
/*
* Send a close request to "undo" our open-ack. The close-ack will
* release qcom_glink_send_open_req() reference and the last reference
* will be relesed after receiving remote_close or transport unregister
* by calling qcom_glink_native_remove().
*/
qcom_glink_send_close_req(glink, channel);
return ret;
}
static struct rpmsg_endpoint *qcom_glink_create_ept(struct rpmsg_device *rpdev,
rpmsg_rx_cb_t cb,
void *priv,
struct rpmsg_channel_info
chinfo)
{
struct glink_channel *parent = to_glink_channel(rpdev->ept);
struct glink_channel *channel;
struct qcom_glink *glink = parent->glink;
struct rpmsg_endpoint *ept;
const char *name = chinfo.name;
int cid;
int ret;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
idr_for_each_entry(&glink->rcids, channel, cid) {
if (!strcmp(channel->name, name))
break;
}
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
channel = qcom_glink_create_local(glink, name);
if (IS_ERR(channel))
return NULL;
} else {
ret = qcom_glink_create_remote(glink, channel);
if (ret)
return NULL;
}
ept = &channel->ept;
ept->rpdev = rpdev;
ept->cb = cb;
ept->priv = priv;
ept->ops = &glink_endpoint_ops;
return ept;
}
static int qcom_glink_announce_create(struct rpmsg_device *rpdev)
{
struct glink_channel *channel = to_glink_channel(rpdev->ept);
struct device_node *np = rpdev->dev.of_node;
struct qcom_glink *glink = channel->glink;
struct glink_core_rx_intent *intent;
const struct property *prop = NULL;
__be32 defaults[] = { cpu_to_be32(SZ_1K), cpu_to_be32(5) };
int num_intents;
int num_groups = 1;
__be32 *val = defaults;
int size;
if (glink->intentless || !completion_done(&channel->open_ack))
return 0;
prop = of_find_property(np, "qcom,intents", NULL);
if (prop) {
val = prop->value;
num_groups = prop->length / sizeof(u32) / 2;
}
/* Channel is now open, advertise base set of intents */
while (num_groups--) {
size = be32_to_cpup(val++);
num_intents = be32_to_cpup(val++);
while (num_intents--) {
intent = qcom_glink_alloc_intent(glink, channel, size,
true);
if (!intent)
break;
qcom_glink_advertise_intent(glink, channel, intent);
}
}
return 0;
}
static void qcom_glink_destroy_ept(struct rpmsg_endpoint *ept)
{
struct glink_channel *channel = to_glink_channel(ept);
struct qcom_glink *glink = channel->glink;
unsigned long flags;
spin_lock_irqsave(&channel->recv_lock, flags);
channel->ept.cb = NULL;
spin_unlock_irqrestore(&channel->recv_lock, flags);
/* Decouple the potential rpdev from the channel */
channel->rpdev = NULL;
qcom_glink_send_close_req(glink, channel);
}
static int qcom_glink_request_intent(struct qcom_glink *glink,
struct glink_channel *channel,
size_t size)
{
struct {
u16 id;
u16 cid;
u32 size;
} __packed cmd;
int ret;
mutex_lock(&channel->intent_req_lock);
reinit_completion(&channel->intent_req_comp);
cmd.id = RPM_CMD_RX_INTENT_REQ;
cmd.cid = channel->lcid;
cmd.size = size;
ret = qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
if (ret)
goto unlock;
ret = wait_for_completion_timeout(&channel->intent_req_comp, 10 * HZ);
if (!ret) {
dev_err(glink->dev, "intent request timed out\n");
ret = -ETIMEDOUT;
} else {
ret = channel->intent_req_result ? 0 : -ECANCELED;
}
unlock:
mutex_unlock(&channel->intent_req_lock);
return ret;
}
static int __qcom_glink_send(struct glink_channel *channel,
void *data, int len, bool wait)
{
struct qcom_glink *glink = channel->glink;
struct glink_core_rx_intent *intent = NULL;
struct glink_core_rx_intent *tmp;
int iid = 0;
struct {
struct glink_msg msg;
__le32 chunk_size;
__le32 left_size;
} __packed req;
int ret;
unsigned long flags;
if (!glink->intentless) {
while (!intent) {
spin_lock_irqsave(&channel->intent_lock, flags);
idr_for_each_entry(&channel->riids, tmp, iid) {
if (tmp->size >= len && !tmp->in_use) {
if (!intent)
intent = tmp;
else if (intent->size > tmp->size)
intent = tmp;
if (intent->size == len)
break;
}
}
if (intent)
intent->in_use = true;
spin_unlock_irqrestore(&channel->intent_lock, flags);
/* We found an available intent */
if (intent)
break;
if (!wait)
return -EBUSY;
ret = qcom_glink_request_intent(glink, channel, len);
if (ret < 0)
return ret;
}
iid = intent->id;
}
req.msg.cmd = cpu_to_le16(RPM_CMD_TX_DATA);
req.msg.param1 = cpu_to_le16(channel->lcid);
req.msg.param2 = cpu_to_le32(iid);
req.chunk_size = cpu_to_le32(len);
req.left_size = cpu_to_le32(0);
ret = qcom_glink_tx(glink, &req, sizeof(req), data, len, wait);
/* Mark intent available if we failed */
if (ret && intent)
intent->in_use = false;
return ret;
}
static int qcom_glink_send(struct rpmsg_endpoint *ept, void *data, int len)
{
struct glink_channel *channel = to_glink_channel(ept);
return __qcom_glink_send(channel, data, len, true);
}
static int qcom_glink_trysend(struct rpmsg_endpoint *ept, void *data, int len)
{
struct glink_channel *channel = to_glink_channel(ept);
return __qcom_glink_send(channel, data, len, false);
}
/*
* Finds the device_node for the glink child interested in this channel.
*/
static struct device_node *qcom_glink_match_channel(struct device_node *node,
const char *channel)
{
struct device_node *child;
const char *name;
const char *key;
int ret;
for_each_available_child_of_node(node, child) {
key = "qcom,glink-channels";
ret = of_property_read_string(child, key, &name);
if (ret)
continue;
if (strcmp(name, channel) == 0)
return child;
}
return NULL;
}
static const struct rpmsg_device_ops glink_device_ops = {
.create_ept = qcom_glink_create_ept,
.announce_create = qcom_glink_announce_create,
};
static const struct rpmsg_endpoint_ops glink_endpoint_ops = {
.destroy_ept = qcom_glink_destroy_ept,
.send = qcom_glink_send,
.trysend = qcom_glink_trysend,
};
static void qcom_glink_rpdev_release(struct device *dev)
{
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
struct glink_channel *channel = to_glink_channel(rpdev->ept);
channel->rpdev = NULL;
kfree(rpdev);
}
static int qcom_glink_rx_open(struct qcom_glink *glink, unsigned int rcid,
char *name)
{
struct glink_channel *channel;
struct rpmsg_device *rpdev;
bool create_device = false;
struct device_node *node;
int lcid;
int ret;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
idr_for_each_entry(&glink->lcids, channel, lcid) {
if (!strcmp(channel->name, name))
break;
}
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (!channel) {
channel = qcom_glink_alloc_channel(glink, name);
if (IS_ERR(channel))
return PTR_ERR(channel);
/* The opening dance was initiated by the remote */
create_device = true;
}
spin_lock_irqsave(&glink->idr_lock, flags);
ret = idr_alloc(&glink->rcids, channel, rcid, rcid + 1, GFP_ATOMIC);
if (ret < 0) {
dev_err(glink->dev, "Unable to insert channel into rcid list\n");
spin_unlock_irqrestore(&glink->idr_lock, flags);
goto free_channel;
}
channel->rcid = ret;
spin_unlock_irqrestore(&glink->idr_lock, flags);
complete_all(&channel->open_req);
if (create_device) {
rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
if (!rpdev) {
ret = -ENOMEM;
goto rcid_remove;
}
rpdev->ept = &channel->ept;
strncpy(rpdev->id.name, name, RPMSG_NAME_SIZE);
rpdev->src = RPMSG_ADDR_ANY;
rpdev->dst = RPMSG_ADDR_ANY;
rpdev->ops = &glink_device_ops;
node = qcom_glink_match_channel(glink->dev->of_node, name);
rpdev->dev.of_node = node;
rpdev->dev.parent = glink->dev;
rpdev->dev.release = qcom_glink_rpdev_release;
ret = rpmsg_register_device(rpdev);
if (ret)
goto rcid_remove;
channel->rpdev = rpdev;
}
return 0;
rcid_remove:
spin_lock_irqsave(&glink->idr_lock, flags);
idr_remove(&glink->rcids, channel->rcid);
channel->rcid = 0;
spin_unlock_irqrestore(&glink->idr_lock, flags);
free_channel:
/* Release the reference, iff we took it */
if (create_device)
kref_put(&channel->refcount, qcom_glink_channel_release);
return ret;
}
static void qcom_glink_rx_close(struct qcom_glink *glink, unsigned int rcid)
{
struct rpmsg_channel_info chinfo;
struct glink_channel *channel;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->rcids, rcid);
spin_unlock_irqrestore(&glink->idr_lock, flags);
if (WARN(!channel, "close request on unknown channel\n"))
return;
/* cancel pending rx_done work */
cancel_work_sync(&channel->intent_work);
if (channel->rpdev) {
strncpy(chinfo.name, channel->name, sizeof(chinfo.name));
chinfo.src = RPMSG_ADDR_ANY;
chinfo.dst = RPMSG_ADDR_ANY;
rpmsg_unregister_device(glink->dev, &chinfo);
}
qcom_glink_send_close_ack(glink, channel->rcid);
spin_lock_irqsave(&glink->idr_lock, flags);
idr_remove(&glink->rcids, channel->rcid);
channel->rcid = 0;
spin_unlock_irqrestore(&glink->idr_lock, flags);
kref_put(&channel->refcount, qcom_glink_channel_release);
}
static void qcom_glink_rx_close_ack(struct qcom_glink *glink, unsigned int lcid)
{
struct glink_channel *channel;
unsigned long flags;
spin_lock_irqsave(&glink->idr_lock, flags);
channel = idr_find(&glink->lcids, lcid);
if (WARN(!channel, "close ack on unknown channel\n")) {
spin_unlock_irqrestore(&glink->idr_lock, flags);
return;
}
idr_remove(&glink->lcids, channel->lcid);
channel->lcid = 0;
spin_unlock_irqrestore(&glink->idr_lock, flags);
kref_put(&channel->refcount, qcom_glink_channel_release);
}
static void qcom_glink_work(struct work_struct *work)
{
struct qcom_glink *glink = container_of(work, struct qcom_glink,
rx_work);
struct glink_defer_cmd *dcmd;
struct glink_msg *msg;
unsigned long flags;
unsigned int param1;
unsigned int param2;
unsigned int cmd;
for (;;) {
spin_lock_irqsave(&glink->rx_lock, flags);
if (list_empty(&glink->rx_queue)) {
spin_unlock_irqrestore(&glink->rx_lock, flags);
break;
}
dcmd = list_first_entry(&glink->rx_queue,
struct glink_defer_cmd, node);
list_del(&dcmd->node);
spin_unlock_irqrestore(&glink->rx_lock, flags);
msg = &dcmd->msg;
cmd = le16_to_cpu(msg->cmd);
param1 = le16_to_cpu(msg->param1);
param2 = le32_to_cpu(msg->param2);
switch (cmd) {
case RPM_CMD_VERSION:
qcom_glink_receive_version(glink, param1, param2);
break;
case RPM_CMD_VERSION_ACK:
qcom_glink_receive_version_ack(glink, param1, param2);
break;
case RPM_CMD_OPEN:
qcom_glink_rx_open(glink, param1, msg->data);
break;
case RPM_CMD_CLOSE:
qcom_glink_rx_close(glink, param1);
break;
case RPM_CMD_CLOSE_ACK:
qcom_glink_rx_close_ack(glink, param1);
break;
case RPM_CMD_RX_INTENT_REQ:
qcom_glink_handle_intent_req(glink, param1, param2);
break;
default:
WARN(1, "Unknown defer object %d\n", cmd);
break;
}
kfree(dcmd);
}
}
static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
{
struct glink_defer_cmd *dcmd;
struct glink_defer_cmd *tmp;
/* cancel any pending deferred rx_work */
cancel_work_sync(&glink->rx_work);
list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node)
kfree(dcmd);
}
static ssize_t rpmsg_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret = 0;
const char *name;
ret = of_property_read_string(dev->of_node, "label", &name);
if (ret < 0)
name = dev->of_node->name;
return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name);
}
static DEVICE_ATTR_RO(rpmsg_name);
static struct attribute *qcom_glink_attrs[] = {
&dev_attr_rpmsg_name.attr,
NULL
};
ATTRIBUTE_GROUPS(qcom_glink);
static void qcom_glink_device_release(struct device *dev)
{
struct rpmsg_device *rpdev = to_rpmsg_device(dev);
struct glink_channel *channel = to_glink_channel(rpdev->ept);
/* Release qcom_glink_alloc_channel() reference */
kref_put(&channel->refcount, qcom_glink_channel_release);
kfree(rpdev);
}
static int qcom_glink_create_chrdev(struct qcom_glink *glink)
{
struct rpmsg_device *rpdev;
struct glink_channel *channel;
rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
if (!rpdev)
return -ENOMEM;
channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev");
if (IS_ERR(channel)) {
kfree(rpdev);
return PTR_ERR(channel);
}
channel->rpdev = rpdev;
rpdev->ept = &channel->ept;
rpdev->ops = &glink_device_ops;
rpdev->dev.parent = glink->dev;
rpdev->dev.release = qcom_glink_device_release;
return rpmsg_chrdev_register_device(rpdev);
}
struct qcom_glink *qcom_glink_native_probe(struct device *dev,
unsigned long features,
struct qcom_glink_pipe *rx,
struct qcom_glink_pipe *tx,
bool intentless)
{
int irq;
int ret;
struct qcom_glink *glink;
glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);
if (!glink)
return ERR_PTR(-ENOMEM);
glink->dev = dev;
glink->tx_pipe = tx;
glink->rx_pipe = rx;
glink->features = features;
glink->intentless = intentless;
spin_lock_init(&glink->tx_lock);
spin_lock_init(&glink->rx_lock);
INIT_LIST_HEAD(&glink->rx_queue);
INIT_WORK(&glink->rx_work, qcom_glink_work);
spin_lock_init(&glink->idr_lock);
idr_init(&glink->lcids);
idr_init(&glink->rcids);
glink->dev->groups = qcom_glink_groups;
ret = device_add_groups(dev, qcom_glink_groups);
if (ret)
dev_err(dev, "failed to add groups\n");
ret = of_property_read_string(dev->of_node, "label", &glink->name);
if (ret < 0)
glink->name = dev->of_node->name;
glink->mbox_client.dev = dev;
glink->mbox_client.knows_txdone = true;
glink->mbox_chan = mbox_request_channel(&glink->mbox_client, 0);
if (IS_ERR(glink->mbox_chan)) {
if (PTR_ERR(glink->mbox_chan) != -EPROBE_DEFER)
dev_err(dev, "failed to acquire IPC channel\n");
return ERR_CAST(glink->mbox_chan);
}
irq = of_irq_get(dev->of_node, 0);
ret = devm_request_irq(dev, irq,
qcom_glink_native_intr,
IRQF_NO_SUSPEND | IRQF_SHARED,
"glink-native", glink);
if (ret) {
dev_err(dev, "failed to request IRQ\n");
return ERR_PTR(ret);
}
glink->irq = irq;
ret = qcom_glink_send_version(glink);
if (ret)
return ERR_PTR(ret);
ret = qcom_glink_create_chrdev(glink);
if (ret)
dev_err(glink->dev, "failed to register chrdev\n");
return glink;
}
EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
static int qcom_glink_remove_device(struct device *dev, void *data)
{
device_unregister(dev);
return 0;
}
void qcom_glink_native_remove(struct qcom_glink *glink)
{
struct glink_channel *channel;
int cid;
int ret;
disable_irq(glink->irq);
qcom_glink_cancel_rx_work(glink);
ret = device_for_each_child(glink->dev, NULL, qcom_glink_remove_device);
if (ret)
dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret);
/* Release any defunct local channels, waiting for close-ack */
idr_for_each_entry(&glink->lcids, channel, cid)
kref_put(&channel->refcount, qcom_glink_channel_release);
/* Release any defunct local channels, waiting for close-req */
idr_for_each_entry(&glink->rcids, channel, cid)
kref_put(&channel->refcount, qcom_glink_channel_release);
idr_destroy(&glink->lcids);
idr_destroy(&glink->rcids);
mbox_free_channel(glink->mbox_chan);
}
EXPORT_SYMBOL_GPL(qcom_glink_native_remove);
void qcom_glink_native_unregister(struct qcom_glink *glink)
{
device_unregister(glink->dev);
}
EXPORT_SYMBOL_GPL(qcom_glink_native_unregister);
MODULE_DESCRIPTION("Qualcomm GLINK driver");
MODULE_LICENSE("GPL v2");