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Subject[PATCH v4 6/8] usb: mausb_host: Add logic for PAL-to-PAL communication
Date
Implemeneted connection between PAL and Link layers and set up
environment for exchanging PAL-to-PAL messages.

Within this patch, driver's sysfs parameters have been created
with intention to configure remote connection parameters.

Signed-off-by: Vladimir Stankovic <vladimir.stankovic@displaylink.com>
---
drivers/usb/mausb_host/hpal.c | 522 ++++++++++++++++++++++++++++
drivers/usb/mausb_host/hpal.h | 6 +
drivers/usb/mausb_host/mausb_core.c | 103 +++++-
3 files changed, 630 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/mausb_host/hpal.c b/drivers/usb/mausb_host/hpal.c
index ac86cbc71e36..b8e00e6ef69c 100644
--- a/drivers/usb/mausb_host/hpal.c
+++ b/drivers/usb/mausb_host/hpal.c
@@ -13,10 +13,15 @@
#include "hcd.h"
#include "utils.h"

+#define MAUSB_DELETE_MADEV_TIMEOUT_MS 3000
+
struct mss mss;

+static int mausb_start_connection_timer(struct mausb_device *dev);
static int mausb_power_state_cb(struct notifier_block *nb, unsigned long action,
void *data);
+static void mausb_signal_empty_mss(void);
+static void mausb_remove_madev_from_list(u8 madev_addr);
static void mausb_execute_urb_dequeue(struct work_struct *dequeue_work);
static int mausb_start_heartbeat_timer(void);

@@ -177,6 +182,55 @@ static bool mausb_return_urb_ctx_to_tree(struct mausb_urb_ctx *urb_ctx,
return true;
}

+static void mausb_complete_urbs_from_tree(void)
+{
+ struct mausb_urb_ctx *urb_ctx = NULL;
+ struct urb *current_urb = NULL;
+ struct rb_node *current_node = NULL;
+ unsigned long flags;
+ int status = 0;
+ int ret;
+
+ mausb_pr_debug("Completing all urbs from tree");
+
+ spin_lock_irqsave(&mhcd->lock, flags);
+
+ while ((current_node = rb_first(&mhcd->mausb_urbs))) {
+ urb_ctx = rb_entry(current_node, struct mausb_urb_ctx, rb_node);
+
+ current_urb = urb_ctx->urb;
+ mausb_delete_urb_ctx_from_tree(urb_ctx);
+ mausb_uninit_data_iterator(&urb_ctx->iterator);
+ kfree(urb_ctx);
+
+ ret = usb_hcd_check_unlink_urb(current_urb->hcpriv,
+ current_urb, status);
+ if (ret == -EIDRM)
+ mausb_pr_warn("Urb=%p is already unlinked",
+ current_urb);
+ else
+ usb_hcd_unlink_urb_from_ep(current_urb->hcpriv,
+ current_urb);
+
+ spin_unlock_irqrestore(&mhcd->lock, flags);
+
+ /* Prepare urb for completion */
+ mausb_pr_debug("Completing urb=%p", current_urb);
+
+ current_urb->status = -EPROTO;
+ current_urb->actual_length = 0;
+ atomic_dec(&current_urb->use_count);
+ usb_hcd_giveback_urb(current_urb->hcpriv, current_urb,
+ current_urb->status);
+
+ spin_lock_irqsave(&mhcd->lock, flags);
+ }
+
+ spin_unlock_irqrestore(&mhcd->lock, flags);
+
+ mausb_pr_debug("Completed all urbs from tree");
+}
+
/*After this function call only valid thing to do with urb is to give it back*/
struct mausb_urb_ctx *mausb_unlink_and_delete_urb_from_tree(struct urb *urb,
int status)
@@ -284,6 +338,161 @@ static inline void mausb_port_has_changed_event(struct mausb_device *dev,
mausb_port_has_changed(USB20HUB, HIGH_SPEED, dev);
}

+static void mausb_socket_disconnect_event(struct work_struct *work)
+{
+ struct mausb_device *dev = container_of(work, struct mausb_device,
+ socket_disconnect_work);
+ struct mausb_event event;
+
+ mausb_pr_info("madev_addr=%d", dev->madev_addr);
+
+ mausb_ip_disconnect(dev->ctrl_channel);
+ mausb_destroy_ip_ctx(dev->ctrl_channel);
+ dev->ctrl_channel = NULL;
+
+ mausb_ip_disconnect(dev->bulk_channel);
+ mausb_destroy_ip_ctx(dev->bulk_channel);
+ dev->bulk_channel = NULL;
+
+ mausb_ip_disconnect(dev->isoch_channel);
+ mausb_destroy_ip_ctx(dev->isoch_channel);
+ dev->isoch_channel = NULL;
+
+ if (dev->mgmt_channel) {
+ memset(&event, 0, sizeof(event));
+ event.type = MAUSB_EVENT_TYPE_NETWORK_DISCONNECTED;
+ event.data.device_id = dev->id;
+
+ mausb_pr_info("Releasing MAUSB device ref");
+ kref_put(&dev->refcount, mausb_release_ma_dev_async);
+ }
+
+ mausb_ip_disconnect(dev->mgmt_channel);
+ mausb_destroy_ip_ctx(dev->mgmt_channel);
+ dev->mgmt_channel = NULL;
+
+ memset(dev->channel_map, 0, sizeof(dev->channel_map));
+}
+
+static void mausb_disconnect_ma_dev(struct mausb_device *dev)
+{
+ mausb_pr_info("Disconnecting MAUSB device madev_addr=%d",
+ dev->madev_addr);
+
+ if (!dev->dev_connected) {
+ mausb_pr_warn("MAUSB device is not connected");
+ kref_put(&dev->refcount, mausb_release_ma_dev_async);
+ return;
+ }
+ mausb_hcd_disconnect(dev->port_number, dev->dev_type, dev->dev_speed);
+
+ if (dev->dev_type == USB30HUB)
+ mausb_hcd_disconnect(dev->port_number, USB20HUB, HIGH_SPEED);
+}
+
+static void mausb_hcd_disconnect_event(struct work_struct *work)
+{
+ struct mausb_device *ma_dev = container_of(work, struct mausb_device,
+ hcd_disconnect_work);
+
+ mausb_disconnect_ma_dev(ma_dev);
+}
+
+static void mausb_delete_madev(struct work_struct *work)
+{
+ struct mausb_device *dev = container_of(work, struct mausb_device,
+ madev_delete_work);
+ struct mausb_event event;
+ struct completion completion;
+ struct completion *user_event;
+ struct mausb_completion mausb_completion;
+ long status;
+ unsigned long timeout = msecs_to_jiffies(MAUSB_DELETE_MADEV_TIMEOUT_MS);
+
+ mausb_pr_info("Deleting MAUSB device madev_addr=%d", dev->madev_addr);
+
+ del_timer_sync(&dev->connection_timer);
+
+ /* Client IS responsive */
+ if (!atomic_read(&dev->unresponsive_client)) {
+ memset(&event, 0, sizeof(event));
+ event.type = MAUSB_EVENT_TYPE_DELETE_MA_DEV;
+ event.mgmt.delete_ma_dev.device_id = dev->id;
+ event.mgmt.delete_ma_dev.event_id = mausb_event_id(dev);
+
+ init_completion(&completion);
+ mausb_completion.completion_event = &completion;
+ mausb_completion.event_id = event.mgmt.delete_ma_dev.event_id;
+ mausb_completion.mausb_event = &event;
+
+ mausb_insert_event(dev, &mausb_completion);
+
+ mausb_pr_debug("Deleting MAUSB device...");
+
+ status = wait_for_completion_interruptible_timeout(&completion,
+ timeout);
+
+ mausb_pr_debug("Deleting MAUSB device event finished with %ld",
+ status);
+
+ mausb_remove_event(dev, &mausb_completion);
+
+ user_event = &dev->user_finished_event;
+
+ status = wait_for_completion_interruptible_timeout(user_event,
+ timeout);
+ mausb_pr_info("User event finished with %ld", status);
+ }
+
+ flush_workqueue(dev->workq);
+ destroy_workqueue(dev->workq);
+
+ mausb_clear_hcd_madev(dev->port_number);
+
+ mausb_remove_madev_from_list(dev->madev_addr);
+
+ put_net(dev->net_ns);
+
+ kfree(dev);
+ mausb_signal_empty_mss();
+
+ mausb_pr_info("MAUSB device deleted. Version=%s", MAUSB_DRIVER_VERSION);
+}
+
+static void mausb_ping_work(struct work_struct *work)
+{
+ struct mausb_device *dev = container_of(work, struct mausb_device,
+ ping_work);
+
+ if (mausb_start_connection_timer(dev) < 0) {
+ mausb_pr_err("Device disconnecting due to session timeout madev_addr=%d",
+ dev->madev_addr);
+ queue_work(dev->workq, &dev->socket_disconnect_work);
+ queue_work(dev->workq, &dev->hcd_disconnect_work);
+ return;
+ }
+}
+
+static void mausb_heartbeat_work(struct work_struct *work)
+{
+ struct mausb_device *dev = container_of(work, struct mausb_device,
+ heartbeat_work);
+
+ mausb_pr_err("Device disconnecting - app is unresponsive");
+ atomic_set(&dev->unresponsive_client, 1);
+ mausb_complete_urbs_from_tree();
+ queue_work(dev->workq, &dev->socket_disconnect_work);
+ queue_work(dev->workq, &dev->hcd_disconnect_work);
+}
+
+static void mausb_connection_timer_func(struct timer_list *timer)
+{
+ struct mausb_device *dev = container_of(timer, struct mausb_device,
+ connection_timer);
+
+ queue_work(dev->workq, &dev->ping_work);
+}
+
static void mausb_heartbeat_timer_func(struct timer_list *timer)
{
unsigned long flags = 0;
@@ -308,6 +517,99 @@ static void mausb_heartbeat_timer_func(struct timer_list *timer)
}
}

+static struct mausb_device *
+mausb_create_madev(struct mausb_device_address dev_addr, u8 madev_address,
+ int *status)
+{
+ struct mausb_device *dev;
+ unsigned long flags = 0;
+ char workq_name[16];
+ struct workqueue_struct *workq;
+
+ memset(workq_name, 0, sizeof(workq_name));
+ sprintf(workq_name, "%x", madev_address);
+ strcat(workq_name, "_madev_workq");
+
+ mausb_pr_debug("madev_workq_name = %s", workq_name);
+
+ workq = alloc_ordered_workqueue(workq_name, WQ_MEM_RECLAIM);
+ if (!workq) {
+ mausb_pr_alert("Could not allocate workqueue!");
+ *status = -ENOMEM;
+ return NULL;
+ }
+
+ spin_lock_irqsave(&mss.lock, flags);
+
+ if (mss.deinit_in_progress) {
+ spin_unlock_irqrestore(&mss.lock, flags);
+ mausb_pr_alert("Device creating failed - mss deinit in progress");
+ flush_workqueue(workq);
+ destroy_workqueue(workq);
+ *status = -ESHUTDOWN;
+ return NULL;
+ }
+
+ dev = mausb_get_dev_from_addr_unsafe(madev_address);
+ if (dev) {
+ spin_unlock_irqrestore(&mss.lock, flags);
+ mausb_pr_debug("MAUSB device already connected, madev_address=%x",
+ madev_address);
+ flush_workqueue(workq);
+ destroy_workqueue(workq);
+ *status = -EEXIST;
+ return NULL;
+ }
+
+ dev = kzalloc(sizeof(*dev), GFP_ATOMIC);
+
+ if (!dev) {
+ spin_unlock_irqrestore(&mss.lock, flags);
+ mausb_pr_alert("Could not allocate MAUSB device!");
+ flush_workqueue(workq);
+ destroy_workqueue(workq);
+ *status = -ENOMEM;
+ return NULL;
+ }
+
+ mausb_pr_info("Create MAUSB device. Version=%s", MAUSB_DRIVER_VERSION);
+
+ dev->workq = workq;
+
+ INIT_WORK(&dev->socket_disconnect_work, mausb_socket_disconnect_event);
+ INIT_WORK(&dev->hcd_disconnect_work, mausb_hcd_disconnect_event);
+ INIT_WORK(&dev->madev_delete_work, mausb_delete_madev);
+ INIT_WORK(&dev->ping_work, mausb_ping_work);
+ INIT_WORK(&dev->heartbeat_work, mausb_heartbeat_work);
+
+ kref_init(&dev->refcount);
+
+ dev->event_id = 0;
+ spin_lock_init(&dev->event_id_lock);
+
+ INIT_LIST_HEAD(&dev->completion_events);
+ spin_lock_init(&dev->completion_events_lock);
+ spin_lock_init(&dev->num_of_user_events_lock);
+ spin_lock_init(&dev->connection_timer_lock);
+
+ init_completion(&dev->user_finished_event);
+ atomic_set(&dev->unresponsive_client, 0);
+
+ timer_setup(&dev->connection_timer, mausb_connection_timer_func, 0);
+
+ dev->dev_addr = dev_addr;
+ dev->madev_addr = madev_address;
+ dev->net_ns = get_net(current->nsproxy->net_ns);
+
+ list_add_tail(&dev->list_entry, &mss.madev_list);
+
+ reinit_completion(&mss.empty);
+
+ spin_unlock_irqrestore(&mss.lock, flags);
+
+ return dev;
+}
+
void mausb_release_ma_dev_async(struct kref *kref)
{
struct mausb_device *dev = container_of(kref, struct mausb_device,
@@ -318,6 +620,45 @@ void mausb_release_ma_dev_async(struct kref *kref)
schedule_work(&dev->madev_delete_work);
}

+int mausb_initiate_dev_connection(struct mausb_device_address dev_addr,
+ u8 madev_address)
+{
+ int error = 0;
+ struct mausb_device *dev;
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&mss.lock, flags);
+ dev = mausb_get_dev_from_addr_unsafe(madev_address);
+ spin_unlock_irqrestore(&mss.lock, flags);
+
+ if (dev) {
+ mausb_pr_debug("MAUSB device already connected, madev_address=%x",
+ madev_address);
+ return -EEXIST;
+ }
+
+ dev = mausb_create_madev(dev_addr, madev_address, &error);
+
+ if (!dev)
+ return error;
+
+ mausb_pr_info("New MAUSB device created madev_addr=%d", madev_address);
+
+ error = mausb_init_ip_ctx(&dev->mgmt_channel, dev->net_ns,
+ dev->dev_addr.ip.address,
+ dev->dev_addr.ip.port.management, dev,
+ mausb_ip_callback, MAUSB_MGMT_CHANNEL);
+ if (error) {
+ mausb_pr_err("Mgmt ip context init failed: error=%d", error);
+ kref_put(&dev->refcount, mausb_release_ma_dev_async);
+ return error;
+ }
+
+ mausb_ip_connect_async(dev->mgmt_channel);
+
+ return 0;
+}
+
int mausb_enqueue_event_from_user(u8 madev_addr, u16 num_of_events,
u16 num_of_completed)
{
@@ -418,6 +759,26 @@ int mausb_signal_event(struct mausb_device *dev,
return -ETIMEDOUT;
}

+static int mausb_start_connection_timer(struct mausb_device *dev)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&dev->connection_timer_lock, flags);
+
+ if (++dev->receive_failures_num > MAUSB_MAX_RECEIVE_FAILURES) {
+ mausb_pr_err("Missed more than %d ping responses",
+ MAUSB_MAX_RECEIVE_FAILURES);
+ spin_unlock_irqrestore(&dev->connection_timer_lock, flags);
+ return -ETIMEDOUT;
+ }
+
+ mod_timer(&dev->connection_timer, jiffies + msecs_to_jiffies(1000));
+
+ spin_unlock_irqrestore(&dev->connection_timer_lock, flags);
+
+ return 0;
+}
+
void mausb_reset_connection_timer(struct mausb_device *dev)
{
unsigned long flags = 0;
@@ -661,6 +1022,36 @@ struct mausb_device *mausb_get_dev_from_addr_unsafe(u8 madev_addr)
return NULL;
}

+static void mausb_remove_madev_from_list(u8 madev_addr)
+{
+ unsigned long flags = 0;
+ struct mausb_device *ma_dev, *tmp = NULL;
+
+ spin_lock_irqsave(&mss.lock, flags);
+
+ list_for_each_entry_safe(ma_dev, tmp, &mss.madev_list, list_entry) {
+ if (ma_dev->madev_addr == madev_addr) {
+ list_del(&ma_dev->list_entry);
+ break;
+ }
+ }
+
+ if (list_empty(&mss.madev_list))
+ reinit_completion(&mss.rings_events.mausb_ring_has_events);
+
+ spin_unlock_irqrestore(&mss.lock, flags);
+}
+
+static void mausb_signal_empty_mss(void)
+{
+ unsigned long flags = 0;
+
+ spin_lock_irqsave(&mss.lock, flags);
+ if (list_empty(&mss.madev_list))
+ complete(&mss.empty);
+ spin_unlock_irqrestore(&mss.lock, flags);
+}
+
static inline
struct mausb_ip_ctx *mausb_get_data_channel(struct mausb_device *ma_dev,
enum mausb_channel channel)
@@ -814,6 +1205,137 @@ void mausb_cleanup_chunks_list(struct list_head *chunks_list)
}
}

+static void mausb_init_ip_ctx_helper(struct mausb_device *dev,
+ struct mausb_ip_ctx **ip_ctx,
+ u16 port,
+ enum mausb_channel channel)
+{
+ int status = mausb_init_ip_ctx(ip_ctx, dev->net_ns,
+ dev->dev_addr.ip.address, port, dev,
+ mausb_ip_callback, channel);
+ if (status < 0) {
+ mausb_pr_err("Init ip context failed with error=%d", status);
+ queue_work(dev->workq, &dev->socket_disconnect_work);
+ return;
+ }
+
+ dev->channel_map[channel] = *ip_ctx;
+ mausb_ip_connect_async(*ip_ctx);
+}
+
+static void mausb_connect_callback(struct mausb_device *dev,
+ enum mausb_channel channel, int status)
+{
+ struct mausb_device_address *dev_addr = &dev->dev_addr;
+
+ mausb_pr_info("Connect callback for channel=%d with status=%d",
+ channel, status);
+
+ if (status < 0) {
+ queue_work(dev->workq, &dev->socket_disconnect_work);
+ return;
+ }
+
+ if (channel == MAUSB_MGMT_CHANNEL) {
+ if (dev_addr->ip.port.control == 0) {
+ dev->channel_map[MAUSB_CTRL_CHANNEL] =
+ dev->mgmt_channel;
+ channel = MAUSB_CTRL_CHANNEL;
+ } else {
+ mausb_init_ip_ctx_helper(dev, &dev->ctrl_channel,
+ dev_addr->ip.port.control,
+ MAUSB_CTRL_CHANNEL);
+ return;
+ }
+ }
+
+ if (channel == MAUSB_CTRL_CHANNEL) {
+ if (dev_addr->ip.port.bulk == 0) {
+ dev->channel_map[MAUSB_BULK_CHANNEL] =
+ dev->channel_map[MAUSB_CTRL_CHANNEL];
+ channel = MAUSB_BULK_CHANNEL;
+ } else {
+ mausb_init_ip_ctx_helper(dev, &dev->bulk_channel,
+ dev_addr->ip.port.bulk,
+ MAUSB_BULK_CHANNEL);
+ return;
+ }
+ }
+
+ if (channel == MAUSB_BULK_CHANNEL) {
+ if (dev_addr->ip.port.isochronous == 0) {
+ /* if there is no isoch port use tcp for it */
+ dev->channel_map[MAUSB_ISOCH_CHANNEL] =
+ dev->channel_map[MAUSB_BULK_CHANNEL];
+ channel = MAUSB_ISOCH_CHANNEL;
+ } else {
+ mausb_init_ip_ctx_helper(dev, &dev->isoch_channel,
+ dev_addr->ip.port.isochronous,
+ MAUSB_ISOCH_CHANNEL);
+ return;
+ }
+ }
+
+ if (channel == MAUSB_ISOCH_CHANNEL) {
+ dev->channel_map[MAUSB_INTR_CHANNEL] =
+ dev->channel_map[MAUSB_CTRL_CHANNEL];
+ }
+}
+
+static void mausb_handle_connect_event(struct mausb_device *dev,
+ enum mausb_channel channel, int status,
+ void *data)
+{
+ mausb_connect_callback(dev, channel, status);
+}
+
+static void mausb_handle_receive_event(struct mausb_device *dev,
+ enum mausb_channel channel, int status,
+ void *data)
+{
+ struct mausb_event event;
+
+ event.madev_addr = dev->madev_addr;
+
+ if (status <= 0) {
+ mausb_pr_err("Receive event error status=%d", status);
+ queue_work(dev->workq, &dev->socket_disconnect_work);
+ queue_work(dev->workq, &dev->hcd_disconnect_work);
+ return;
+ }
+
+ mausb_reset_connection_timer(dev);
+}
+
+void mausb_ip_callback(void *ctx, enum mausb_channel channel,
+ enum mausb_link_action action, int status, void *data)
+{
+ struct mausb_device *dev = (struct mausb_device *)ctx;
+
+ switch (action) {
+ case MAUSB_LINK_CONNECT:
+ mausb_handle_connect_event(dev, channel, status, data);
+ break;
+ case MAUSB_LINK_SEND:
+ /*
+ * Currently there is nothing to do, as send operation is
+ * synchronous
+ */
+ break;
+ case MAUSB_LINK_RECV:
+ mausb_handle_receive_event(dev, channel, status, data);
+ break;
+ case MAUSB_LINK_DISCONNECT:
+ /*
+ * Currently there is nothing to do, as disconnect operation is
+ * synchronous
+ */
+ break;
+ default:
+ mausb_pr_warn("Unknown network action");
+ }
+}
+
static int mausb_read_virtual_buffer(struct mausb_data_iter *iterator,
u32 byte_num,
struct list_head *data_chunks_list,
diff --git a/drivers/usb/mausb_host/hpal.h b/drivers/usb/mausb_host/hpal.h
index f184bbc07783..a04ed120ba5e 100644
--- a/drivers/usb/mausb_host/hpal.h
+++ b/drivers/usb/mausb_host/hpal.h
@@ -131,6 +131,8 @@ static inline u64 mausb_event_id(struct mausb_device *dev)
return val;
}

+int mausb_initiate_dev_connection(struct mausb_device_address device_address,
+ u8 madev_address);
int mausb_data_req_enqueue_event(struct mausb_device *dev, u16 ep_handle,
struct urb *request);
int mausb_signal_event(struct mausb_device *dev, struct mausb_event *event,
@@ -158,6 +160,7 @@ static inline void mausb_remove_event(struct mausb_device *dev,
}

void mausb_release_ma_dev_async(struct kref *kref);
+void mausb_on_madev_connected(struct mausb_device *dev);
void mausb_complete_request(struct urb *urb, u32 actual_length, int status);
void mausb_complete_urb(struct mausb_event *event);
void mausb_reset_connection_timer(struct mausb_device *dev);
@@ -240,6 +243,9 @@ enum mausb_channel mausb_transfer_type_to_channel(u8 transfer_type)
return transfer_type >> 3;
}

+void mausb_ip_callback(void *ctx, enum mausb_channel channel,
+ enum mausb_link_action action, int status, void *data);
+
struct mausb_data_iter {
u32 length;

diff --git a/drivers/usb/mausb_host/mausb_core.c b/drivers/usb/mausb_host/mausb_core.c
index 8730590126ea..101afd0b9deb 100644
--- a/drivers/usb/mausb_host/mausb_core.c
+++ b/drivers/usb/mausb_host/mausb_core.c
@@ -13,41 +13,122 @@

#include "hcd.h"
#include "hpal.h"
+#include "mausb_address.h"
#include "utils.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("DisplayLink (UK) Ltd.");
MODULE_VERSION(MAUSB_DRIVER_VERSION);

+static struct mausb_device_address device_address;
+static int mausb_device_disconnect_param;
+static u16 madev_addr;
+static u8 mausb_client_connect_param;
+static u8 mausb_client_disconnect_param;
+
static int mausb_client_connect(const char *value,
const struct kernel_param *kp)
{
+ unsigned long flags = 0;
+
mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);

+ spin_lock_irqsave(&mss.lock, flags);
+ if (mss.client_connected) {
+ mausb_pr_err("MA-USB client is already connected");
+ spin_unlock_irqrestore(&mss.lock, flags);
+ return -EEXIST;
+ }
+ /* Save heartbeat client information */
+ mss.client_connected = true;
+ mss.missed_heartbeats = 0;
+ reinit_completion(&mss.client_stopped);
+ spin_unlock_irqrestore(&mss.lock, flags);
+ /* Start hearbeat timer */
+ mod_timer(&mss.heartbeat_timer,
+ jiffies + msecs_to_jiffies(MAUSB_HEARTBEAT_TIMEOUT_MS));
+
return 0;
}

static int mausb_client_disconnect(const char *value,
const struct kernel_param *kp)
{
+ unsigned long flags = 0;
+ struct mausb_device *dev = NULL;
+
mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);

+ spin_lock_irqsave(&mss.lock, flags);
+ if (!mss.client_connected) {
+ mausb_pr_err("MA-USB client is not connected");
+ spin_unlock_irqrestore(&mss.lock, flags);
+ return -ENODEV;
+ }
+
+ spin_unlock_irqrestore(&mss.lock, flags);
+
+ /* Stop heartbeat timer */
+ del_timer_sync(&mss.heartbeat_timer);
+
+ /* Clear heartbeat client information */
+ spin_lock_irqsave(&mss.lock, flags);
+ mss.client_connected = false;
+ mss.missed_heartbeats = 0;
+ list_for_each_entry(dev, &mss.madev_list, list_entry) {
+ mausb_pr_debug("Enqueue heartbeat_work madev_addr=%x",
+ dev->madev_addr);
+ queue_work(dev->workq, &dev->heartbeat_work);
+ }
+ complete(&mss.client_stopped);
+ spin_unlock_irqrestore(&mss.lock, flags);
+
return 0;
}

static int mausb_device_connect(const char *value,
const struct kernel_param *kp)
{
+ int status = 0;
+
mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);

- return 0;
+ if (strlen(value) <= INET6_ADDRSTRLEN) {
+ strcpy(device_address.ip.address, value);
+ mausb_pr_info("Processing '%s' address",
+ device_address.ip.address);
+ } else {
+ mausb_pr_err("Invalid IP format");
+ return 0;
+ }
+ status = mausb_initiate_dev_connection(device_address, madev_addr);
+ memset(&device_address, 0, sizeof(device_address));
+
+ return status;
}

static int mausb_device_disconnect(const char *value,
const struct kernel_param *kp)
{
+ u8 dev_address = 0;
+ int status = 0;
+ unsigned long flags = 0;
+ struct mausb_device *dev = NULL;
+
mausb_pr_info("Version=%s", MAUSB_DRIVER_VERSION);

+ status = kstrtou8(value, 0, &dev_address);
+ if (status < 0)
+ return -EINVAL;
+
+ spin_lock_irqsave(&mss.lock, flags);
+
+ dev = mausb_get_dev_from_addr_unsafe(dev_address);
+ if (dev)
+ queue_work(dev->workq, &dev->hcd_disconnect_work);
+
+ spin_unlock_irqrestore(&mss.lock, flags);
+
return 0;
}

@@ -67,6 +148,26 @@ static const struct kernel_param_ops mausb_client_disconnect_ops = {
.set = mausb_client_disconnect
};

+module_param_named(mgmt, device_address.ip.port.management, ushort, 0664);
+MODULE_PARM_DESC(mgmt, "MA-USB management port");
+module_param_named(ctrl, device_address.ip.port.control, ushort, 0664);
+MODULE_PARM_DESC(ctrl, "MA-USB control port");
+module_param_named(bulk, device_address.ip.port.bulk, ushort, 0664);
+MODULE_PARM_DESC(bulk, "MA-USB bulk port");
+module_param_named(isoch, device_address.ip.port.isochronous, ushort, 0664);
+MODULE_PARM_DESC(isoch, "MA-USB isochronous port");
+module_param_named(madev_addr, madev_addr, ushort, 0664);
+MODULE_PARM_DESC(madev_addr, "MA-USB device address");
+
+module_param_cb(client_connect, &mausb_client_connect_ops,
+ &mausb_client_connect_param, 0664);
+module_param_cb(client_disconnect, &mausb_client_disconnect_ops,
+ &mausb_client_disconnect_param, 0664);
+module_param_cb(ip, &mausb_device_connect_ops,
+ device_address.ip.address, 0664);
+module_param_cb(disconnect, &mausb_device_disconnect_ops,
+ &mausb_device_disconnect_param, 0664);
+
static int mausb_host_init(void)
{
int status;
--
2.17.1
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