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android_kernel_samsung_msm8976/arch/arm/mach-msm/msm_qmi_interface.c

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/* Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/list.h>
#include <linux/socket.h>
#include <linux/gfp.h>
#include <linux/qmi_encdec.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/hashtable.h>
#include <linux/ipc_router.h>
#include <mach/msm_qmi_interface.h>
#include "msm_qmi_interface_priv.h"
#define BUILD_INSTANCE_ID(vers, ins) (((vers) & 0xFF) | (((ins) & 0xFF) << 8))
#define LOOKUP_MASK 0xFFFFFFFF
#define MAX_WQ_NAME_LEN 20
static LIST_HEAD(svc_event_nb_list);
static DEFINE_MUTEX(svc_event_nb_list_lock);
struct qmi_notify_event_work {
unsigned event;
void *oob_data;
size_t oob_data_len;
void *priv;
struct work_struct work;
};
static void qmi_notify_event_worker(struct work_struct *work);
#define HANDLE_HASH_TBL_SZ 1
static DEFINE_HASHTABLE(handle_hash_tbl, HANDLE_HASH_TBL_SZ);
static DEFINE_MUTEX(handle_hash_tbl_lock);
struct elem_info qmi_response_type_v01_ei[] = {
{
.data_type = QMI_SIGNED_2_BYTE_ENUM,
.elem_len = 1,
.elem_size = sizeof(uint16_t),
.is_array = NO_ARRAY,
.tlv_type = QMI_COMMON_TLV_TYPE,
.offset = offsetof(struct qmi_response_type_v01,
result),
.ei_array = NULL,
},
{
.data_type = QMI_SIGNED_2_BYTE_ENUM,
.elem_len = 1,
.elem_size = sizeof(uint16_t),
.is_array = NO_ARRAY,
.tlv_type = QMI_COMMON_TLV_TYPE,
.offset = offsetof(struct qmi_response_type_v01,
error),
.ei_array = NULL,
},
{
.data_type = QMI_EOTI,
.elem_len = 0,
.elem_size = 0,
.is_array = NO_ARRAY,
.tlv_type = QMI_COMMON_TLV_TYPE,
.offset = 0,
.ei_array = NULL,
},
};
struct elem_info qmi_error_resp_type_v01_ei[] = {
{
.data_type = QMI_STRUCT,
.elem_len = 1,
.elem_size = sizeof(struct qmi_response_type_v01),
.is_array = NO_ARRAY,
.tlv_type = 0x02,
.offset = 0,
.ei_array = qmi_response_type_v01_ei,
},
{
.data_type = QMI_EOTI,
.elem_len = 0,
.elem_size = 0,
.is_array = NO_ARRAY,
.tlv_type = 0x00,
.offset = 0,
.ei_array = NULL,
},
};
struct msg_desc err_resp_desc = {
.max_msg_len = 7,
.msg_id = 0,
.ei_array = qmi_error_resp_type_v01_ei,
};
static void svc_resume_tx_worker(struct work_struct *work);
/**
* add_req_handle() - Create and Add a request handle to the connection
* @conn_h: Connection handle over which the request has arrived.
* @msg_id: Message ID of the request.
* @txn_id: Transaction ID of the request.
*
* @return: Pointer to request handle on success, NULL on error.
*
* This function creates a request handle to track the request that arrives
* on a connection. This function then adds it to the connection's request
* handle list.
*/
static struct req_handle *add_req_handle(struct qmi_svc_clnt_conn *conn_h,
uint16_t msg_id, uint16_t txn_id)
{
struct req_handle *req_h;
req_h = kmalloc(sizeof(struct req_handle), GFP_KERNEL);
if (!req_h) {
pr_err("%s: Error allocating req_h\n", __func__);
return NULL;
}
req_h->conn_h = conn_h;
req_h->msg_id = msg_id;
req_h->txn_id = txn_id;
list_add_tail(&req_h->list, &conn_h->req_handle_list);
return req_h;
}
/**
* verify_req_handle() - Verify the validity of a request handle
* @conn_h: Connection handle over which the request has arrived.
* @req_h: Request handle to be verified.
*
* @return: true on success, false on failure.
*
* This function is used to check if the request handle is present in
* the connection handle.
*/
static bool verify_req_handle(struct qmi_svc_clnt_conn *conn_h,
struct req_handle *req_h)
{
struct req_handle *temp_req_h;
list_for_each_entry(temp_req_h, &conn_h->req_handle_list, list) {
if (temp_req_h == req_h)
return true;
}
return false;
}
/**
* rmv_req_handle() - Remove and destroy the request handle
* @req_h: Request handle to be removed and destroyed.
*
* @return: 0.
*/
static int rmv_req_handle(struct req_handle *req_h)
{
list_del(&req_h->list);
kfree(req_h);
return 0;
}
/**
* add_svc_clnt_conn() - Create and add a connection handle to a service
* @handle: QMI handle in which the service is hosted.
* @clnt_addr: Address of the client connecting with the service.
* @clnt_addr_len: Length of the client address.
*
* @return: Pointer to connection handle on success, NULL on error.
*
* This function is used to create a connection handle that binds the service
* with a client. This function is called on a service's QMI handle when a
* client sends its first message to the service.
*
* This function must be called with handle->handle_lock locked.
*/
static struct qmi_svc_clnt_conn *add_svc_clnt_conn(
struct qmi_handle *handle, void *clnt_addr, size_t clnt_addr_len)
{
struct qmi_svc_clnt_conn *conn_h;
conn_h = kmalloc(sizeof(struct qmi_svc_clnt_conn), GFP_KERNEL);
if (!conn_h) {
pr_err("%s: Error allocating conn_h\n", __func__);
return NULL;
}
conn_h->clnt_addr = kmalloc(clnt_addr_len, GFP_KERNEL);
if (!conn_h->clnt_addr) {
pr_err("%s: Error allocating clnt_addr\n", __func__);
return NULL;
}
INIT_LIST_HEAD(&conn_h->list);
conn_h->svc_handle = handle;
memcpy(conn_h->clnt_addr, clnt_addr, clnt_addr_len);
conn_h->clnt_addr_len = clnt_addr_len;
INIT_LIST_HEAD(&conn_h->req_handle_list);
INIT_DELAYED_WORK(&conn_h->resume_tx_work, svc_resume_tx_worker);
INIT_LIST_HEAD(&conn_h->pending_txn_list);
mutex_init(&conn_h->pending_txn_lock);
list_add_tail(&conn_h->list, &handle->conn_list);
return conn_h;
}
/**
* find_svc_clnt_conn() - Find the existence of a client<->service connection
* @handle: Service's QMI handle.
* @clnt_addr: Address of the client to be present in the connection.
* @clnt_addr_len: Length of the client address.
*
* @return: Pointer to connection handle if the matching connection is found,
* NULL if the connection is not found.
*
* This function is used to find the existence of a client<->service connection
* handle in a service's QMI handle. This function tries to match the client
* address in the existing connections.
*
* This function must be called with handle->handle_lock locked.
*/
static struct qmi_svc_clnt_conn *find_svc_clnt_conn(
struct qmi_handle *handle, void *clnt_addr, size_t clnt_addr_len)
{
struct qmi_svc_clnt_conn *conn_h;
list_for_each_entry(conn_h, &handle->conn_list, list) {
if (!memcmp(conn_h->clnt_addr, clnt_addr, clnt_addr_len))
return conn_h;
}
return NULL;
}
/**
* verify_svc_clnt_conn() - Verify the existence of a connection handle
* @handle: Service's QMI handle.
* @conn_h: Connection handle to be verified.
*
* @return: true on success, false on failure.
*
* This function is used to verify the existence of a connection in the
* connection list maintained by the service.
*
* This function must be called with handle->handle_lock locked.
*/
static bool verify_svc_clnt_conn(struct qmi_handle *handle,
struct qmi_svc_clnt_conn *conn_h)
{
struct qmi_svc_clnt_conn *temp_conn_h;
list_for_each_entry(temp_conn_h, &handle->conn_list, list) {
if (temp_conn_h == conn_h)
return true;
}
return false;
}
/**
* rmv_svc_clnt_conn() - Remove the connection handle info from the service
* @conn_h: Connection handle to be removed.
*
* This function removes a connection handle from a service's QMI handle.
*
* This function must be called with handle->handle_lock locked.
*/
static void rmv_svc_clnt_conn(struct qmi_svc_clnt_conn *conn_h)
{
struct req_handle *req_h, *temp_req_h;
struct qmi_txn *txn_h, *temp_txn_h;
list_del(&conn_h->list);
list_for_each_entry_safe(req_h, temp_req_h,
&conn_h->req_handle_list, list)
rmv_req_handle(req_h);
mutex_lock(&conn_h->pending_txn_lock);
list_for_each_entry_safe(txn_h, temp_txn_h,
&conn_h->pending_txn_list, list) {
list_del(&txn_h->list);
kfree(txn_h->enc_data);
kfree(txn_h);
}
mutex_unlock(&conn_h->pending_txn_lock);
flush_delayed_work(&conn_h->resume_tx_work);
kfree(conn_h->clnt_addr);
kfree(conn_h);
}
/**
* qmi_event_notify() - Notification function to QMI client/service interface
* @event: Type of event that gets notified.
* @oob_data: Any out-of-band data associated with event.
* @oob_data_len: Length of the out-of-band data, if any.
* @priv: Private data.
*
* This function is called by the underlying transport to notify the QMI
* interface regarding any incoming event. This function is registered by
* QMI interface when it opens a port/handle with the underlying transport.
*/
static void qmi_event_notify(unsigned event, void *oob_data,
size_t oob_data_len, void *priv)
{
struct qmi_notify_event_work *notify_work;
struct qmi_handle *handle;
uint32_t key = 0;
notify_work = kmalloc(sizeof(struct qmi_notify_event_work),
GFP_KERNEL);
if (!notify_work) {
pr_err("%s: Couldn't notify %d event to %p\n",
__func__, event, priv);
return;
}
notify_work->event = event;
notify_work->oob_data = oob_data;
notify_work->oob_data_len = oob_data_len;
notify_work->priv = priv;
INIT_WORK(&notify_work->work, qmi_notify_event_worker);
mutex_lock(&handle_hash_tbl_lock);
hash_for_each_possible(handle_hash_tbl, handle, handle_hash, key) {
if (handle == (struct qmi_handle *)priv) {
queue_work(handle->handle_wq,
&notify_work->work);
mutex_unlock(&handle_hash_tbl_lock);
return;
}
}
mutex_unlock(&handle_hash_tbl_lock);
kfree(notify_work);
}
static void qmi_notify_event_worker(struct work_struct *work)
{
struct qmi_notify_event_work *notify_work =
container_of(work, struct qmi_notify_event_work, work);
struct qmi_handle *handle = (struct qmi_handle *)notify_work->priv;
unsigned long flags;
if (!handle)
return;
mutex_lock(&handle->handle_lock);
if (handle->handle_reset) {
mutex_unlock(&handle->handle_lock);
kfree(notify_work);
return;
}
switch (notify_work->event) {
case IPC_ROUTER_CTRL_CMD_DATA:
spin_lock_irqsave(&handle->notify_lock, flags);
handle->notify(handle, QMI_RECV_MSG, handle->notify_priv);
spin_unlock_irqrestore(&handle->notify_lock, flags);
break;
case IPC_ROUTER_CTRL_CMD_RESUME_TX:
if (handle->handle_type == QMI_CLIENT_HANDLE) {
queue_delayed_work(handle->handle_wq,
&handle->resume_tx_work,
msecs_to_jiffies(0));
} else if (handle->handle_type == QMI_SERVICE_HANDLE) {
struct msm_ipc_addr rtx_addr;
struct qmi_svc_clnt_conn *conn_h;
union rr_control_msg *msg;
msg = (union rr_control_msg *)notify_work->oob_data;
rtx_addr.addrtype = MSM_IPC_ADDR_ID;
rtx_addr.addr.port_addr.node_id = msg->cli.node_id;
rtx_addr.addr.port_addr.port_id = msg->cli.port_id;
conn_h = find_svc_clnt_conn(handle, &rtx_addr,
sizeof(rtx_addr));
if (conn_h)
queue_delayed_work(handle->handle_wq,
&conn_h->resume_tx_work,
msecs_to_jiffies(0));
}
break;
case IPC_ROUTER_CTRL_CMD_NEW_SERVER:
case IPC_ROUTER_CTRL_CMD_REMOVE_SERVER:
case IPC_ROUTER_CTRL_CMD_REMOVE_CLIENT:
queue_delayed_work(handle->handle_wq,
&handle->ctl_work, msecs_to_jiffies(0));
break;
default:
break;
}
mutex_unlock(&handle->handle_lock);
kfree(notify_work);
}
/**
* clnt_resume_tx_worker() - Handle the Resume_Tx event
* @work : Pointer to the work strcuture.
*
* This function handles the resume_tx event for any QMI client that
* exists in the kernel space. This function parses the pending_txn_list of
* the handle and attempts a send for each transaction in that list.
*/
static void clnt_resume_tx_worker(struct work_struct *work)
{
struct delayed_work *rtx_work = to_delayed_work(work);
struct qmi_handle *handle =
container_of(rtx_work, struct qmi_handle, resume_tx_work);
struct qmi_txn *pend_txn, *temp_txn;
int ret;
uint16_t msg_id;
mutex_lock(&handle->handle_lock);
if (handle->handle_reset)
goto out_clnt_handle_rtx;
list_for_each_entry_safe(pend_txn, temp_txn,
&handle->pending_txn_list, list) {
ret = msm_ipc_router_send_msg(
(struct msm_ipc_port *)handle->src_port,
(struct msm_ipc_addr *)handle->dest_info,
pend_txn->enc_data, pend_txn->enc_data_len);
if (ret == -EAGAIN)
break;
msg_id = ((struct qmi_header *)pend_txn->enc_data)->msg_id;
kfree(pend_txn->enc_data);
if (ret < 0) {
pr_err("%s: Sending transaction %d from port %d failed",
__func__, pend_txn->txn_id,
((struct msm_ipc_port *)handle->src_port)->
this_port.port_id);
if (pend_txn->type == QMI_ASYNC_TXN) {
pend_txn->resp_cb(pend_txn->handle,
msg_id, pend_txn->resp,
pend_txn->resp_cb_data,
ret);
list_del(&pend_txn->list);
kfree(pend_txn);
} else if (pend_txn->type == QMI_SYNC_TXN) {
pend_txn->send_stat = ret;
wake_up(&pend_txn->wait_q);
}
} else {
list_del(&pend_txn->list);
list_add_tail(&pend_txn->list, &handle->txn_list);
}
}
out_clnt_handle_rtx:
mutex_unlock(&handle->handle_lock);
}
/**
* svc_resume_tx_worker() - Handle the Resume_Tx event
* @work : Pointer to the work strcuture.
*
* This function handles the resume_tx event for any QMI service that
* exists in the kernel space. This function parses the pending_txn_list of
* the connection handle and attempts a send for each transaction in that list.
*/
static void svc_resume_tx_worker(struct work_struct *work)
{
struct delayed_work *rtx_work = to_delayed_work(work);
struct qmi_svc_clnt_conn *conn_h =
container_of(rtx_work, struct qmi_svc_clnt_conn,
resume_tx_work);
struct qmi_handle *handle = (struct qmi_handle *)conn_h->svc_handle;
struct qmi_txn *pend_txn, *temp_txn;
int ret;
mutex_lock(&conn_h->pending_txn_lock);
if (handle->handle_reset)
goto out_svc_handle_rtx;
list_for_each_entry_safe(pend_txn, temp_txn,
&conn_h->pending_txn_list, list) {
ret = msm_ipc_router_send_msg(
(struct msm_ipc_port *)handle->src_port,
(struct msm_ipc_addr *)conn_h->clnt_addr,
pend_txn->enc_data, pend_txn->enc_data_len);
if (ret == -EAGAIN)
break;
if (ret < 0)
pr_err("%s: Sending transaction %d from port %d failed",
__func__, pend_txn->txn_id,
((struct msm_ipc_port *)handle->src_port)->
this_port.port_id);
list_del(&pend_txn->list);
kfree(pend_txn->enc_data);
kfree(pend_txn);
}
out_svc_handle_rtx:
mutex_unlock(&conn_h->pending_txn_lock);
}
/**
* handle_rmv_server() - Handle the server exit event
* @handle: Client handle on which the server exit event is received.
* @ctl_msg: Information about the server that is exiting.
*
* @return: 0 on success, standard Linux error codes on failure.
*
* This function must be called with handle->handle_lock locked.
*/
static int handle_rmv_server(struct qmi_handle *handle,
union rr_control_msg *ctl_msg)
{
struct msm_ipc_addr *svc_addr;
unsigned long flags;
svc_addr = (struct msm_ipc_addr *)(handle->dest_info);
if (svc_addr->addr.port_addr.node_id == ctl_msg->srv.node_id &&
svc_addr->addr.port_addr.port_id == ctl_msg->srv.port_id) {
spin_lock_irqsave(&handle->notify_lock, flags);
handle->notify(handle, QMI_SERVER_EXIT, handle->notify_priv);
spin_unlock_irqrestore(&handle->notify_lock, flags);
}
return 0;
}
/**
* handle_rmv_client() - Handle the client exit event
* @handle: Service handle on which the client exit event is received.
* @ctl_msg: Information about the client that is exiting.
*
* @return: 0 on success, standard Linux error codes on failure.
*
* This function must be called with handle->handle_lock locked.
*/
static int handle_rmv_client(struct qmi_handle *handle,
union rr_control_msg *ctl_msg)
{
struct qmi_svc_clnt_conn *conn_h;
struct msm_ipc_addr clnt_addr = {0};
unsigned long flags;
clnt_addr.addrtype = MSM_IPC_ADDR_ID;
clnt_addr.addr.port_addr.node_id = ctl_msg->cli.node_id;
clnt_addr.addr.port_addr.port_id = ctl_msg->cli.port_id;
conn_h = find_svc_clnt_conn(handle, &clnt_addr, sizeof(clnt_addr));
if (conn_h) {
spin_lock_irqsave(&handle->notify_lock, flags);
handle->svc_ops_options->disconnect_cb(handle, conn_h);
spin_unlock_irqrestore(&handle->notify_lock, flags);
rmv_svc_clnt_conn(conn_h);
}
return 0;
}
/**
* handle_ctl_msg: Worker function to handle the control events
* @work: Work item to map the QMI handle.
*
* This function is a worker function to handle the incoming control
* events like REMOVE_SERVER/REMOVE_CLIENT. The work item is unique
* to a handle and the workker function handles the control events on
* a specific handle.
*/
static void handle_ctl_msg(struct work_struct *work)
{
struct delayed_work *ctl_work = to_delayed_work(work);
struct qmi_handle *handle =
container_of(ctl_work, struct qmi_handle, ctl_work);
unsigned int ctl_msg_len;
union rr_control_msg *ctl_msg = NULL;
struct msm_ipc_addr src_addr;
int rc;
mutex_lock(&handle->handle_lock);
while (1) {
if (handle->handle_reset)
break;
/* Read the messages */
rc = msm_ipc_router_read_msg(
(struct msm_ipc_port *)(handle->ctl_port),
&src_addr, (unsigned char **)&ctl_msg, &ctl_msg_len);
if (rc == -ENOMSG)
break;
if (rc < 0) {
pr_err("%s: Read failed %d\n", __func__, rc);
break;
}
if (ctl_msg->cmd == IPC_ROUTER_CTRL_CMD_REMOVE_SERVER &&
handle->handle_type == QMI_CLIENT_HANDLE)
handle_rmv_server(handle, ctl_msg);
else if (ctl_msg->cmd == IPC_ROUTER_CTRL_CMD_REMOVE_CLIENT &&
handle->handle_type == QMI_SERVICE_HANDLE)
handle_rmv_client(handle, ctl_msg);
kfree(ctl_msg);
}
mutex_unlock(&handle->handle_lock);
return;
}
struct qmi_handle *qmi_handle_create(
void (*notify)(struct qmi_handle *handle,
enum qmi_event_type event, void *notify_priv),
void *notify_priv)
{
struct qmi_handle *temp_handle;
struct msm_ipc_port *port_ptr, *ctl_port_ptr;
static uint32_t handle_count;
char wq_name[MAX_WQ_NAME_LEN];
temp_handle = kzalloc(sizeof(struct qmi_handle), GFP_KERNEL);
if (!temp_handle) {
pr_err("%s: Failure allocating client handle\n", __func__);
return NULL;
}
mutex_lock(&handle_hash_tbl_lock);
handle_count++;
scnprintf(wq_name, MAX_WQ_NAME_LEN, "qmi_hndl%08x", handle_count);
hash_add(handle_hash_tbl, &temp_handle->handle_hash, 0);
temp_handle->handle_wq = create_singlethread_workqueue(wq_name);
mutex_unlock(&handle_hash_tbl_lock);
if (!temp_handle->handle_wq) {
pr_err("%s: Couldn't create workqueue for handle\n", __func__);
goto handle_create_err1;
}
/* Initialize common elements */
temp_handle->handle_type = QMI_CLIENT_HANDLE;
temp_handle->next_txn_id = 1;
mutex_init(&temp_handle->handle_lock);
spin_lock_init(&temp_handle->notify_lock);
temp_handle->notify = notify;
temp_handle->notify_priv = notify_priv;
init_waitqueue_head(&temp_handle->reset_waitq);
INIT_DELAYED_WORK(&temp_handle->resume_tx_work, clnt_resume_tx_worker);
INIT_DELAYED_WORK(&temp_handle->ctl_work, handle_ctl_msg);
/* Initialize client specific elements */
INIT_LIST_HEAD(&temp_handle->txn_list);
INIT_LIST_HEAD(&temp_handle->pending_txn_list);
/* Initialize service specific elements */
INIT_LIST_HEAD(&temp_handle->conn_list);
port_ptr = msm_ipc_router_create_port(qmi_event_notify,
(void *)temp_handle);
if (!port_ptr) {
pr_err("%s: IPC router port creation failed\n", __func__);
goto handle_create_err2;
}
ctl_port_ptr = msm_ipc_router_create_port(qmi_event_notify,
(void *)temp_handle);
if (!ctl_port_ptr) {
pr_err("%s: IPC router ctl port creation failed\n", __func__);
goto handle_create_err3;
}
msm_ipc_router_bind_control_port(ctl_port_ptr);
temp_handle->src_port = port_ptr;
temp_handle->ctl_port = ctl_port_ptr;
return temp_handle;
handle_create_err3:
msm_ipc_router_close_port(port_ptr);
handle_create_err2:
destroy_workqueue(temp_handle->handle_wq);
handle_create_err1:
mutex_lock(&handle_hash_tbl_lock);
hash_del(&temp_handle->handle_hash);
mutex_unlock(&handle_hash_tbl_lock);
kfree(temp_handle);
return NULL;
}
EXPORT_SYMBOL(qmi_handle_create);
static void clean_txn_info(struct qmi_handle *handle)
{
struct qmi_txn *txn_handle, *temp_txn_handle, *pend_txn;
list_for_each_entry_safe(pend_txn, temp_txn_handle,
&handle->pending_txn_list, list) {
if (pend_txn->type == QMI_ASYNC_TXN) {
list_del(&pend_txn->list);
pend_txn->resp_cb(pend_txn->handle,
((struct qmi_header *)
pend_txn->enc_data)->msg_id,
pend_txn->resp, pend_txn->resp_cb_data,
-ENETRESET);
kfree(pend_txn->enc_data);
kfree(pend_txn);
} else if (pend_txn->type == QMI_SYNC_TXN) {
kfree(pend_txn->enc_data);
wake_up(&pend_txn->wait_q);
}
}
list_for_each_entry_safe(txn_handle, temp_txn_handle,
&handle->txn_list, list) {
if (txn_handle->type == QMI_ASYNC_TXN) {
list_del(&txn_handle->list);
kfree(txn_handle);
} else if (txn_handle->type == QMI_SYNC_TXN) {
wake_up(&txn_handle->wait_q);
}
}
}
int qmi_handle_destroy(struct qmi_handle *handle)
{
int rc;
if (!handle)
return -EINVAL;
mutex_lock(&handle_hash_tbl_lock);
hash_del(&handle->handle_hash);
mutex_unlock(&handle_hash_tbl_lock);
mutex_lock(&handle->handle_lock);
handle->handle_reset = 1;
clean_txn_info(handle);
msm_ipc_router_close_port((struct msm_ipc_port *)(handle->ctl_port));
msm_ipc_router_close_port((struct msm_ipc_port *)(handle->src_port));
mutex_unlock(&handle->handle_lock);
flush_workqueue(handle->handle_wq);
destroy_workqueue(handle->handle_wq);
rc = wait_event_interruptible(handle->reset_waitq,
list_empty(&handle->txn_list));
kfree(handle->dest_info);
kfree(handle);
return 0;
}
EXPORT_SYMBOL(qmi_handle_destroy);
int qmi_register_ind_cb(struct qmi_handle *handle,
void (*ind_cb)(struct qmi_handle *handle,
unsigned int msg_id, void *msg,
unsigned int msg_len, void *ind_cb_priv),
void *ind_cb_priv)
{
if (!handle)
return -EINVAL;
mutex_lock(&handle->handle_lock);
if (handle->handle_reset) {
mutex_unlock(&handle->handle_lock);
return -ENETRESET;
}
handle->ind_cb = ind_cb;
handle->ind_cb_priv = ind_cb_priv;
mutex_unlock(&handle->handle_lock);
return 0;
}
EXPORT_SYMBOL(qmi_register_ind_cb);
static int qmi_encode_and_send_req(struct qmi_txn **ret_txn_handle,
struct qmi_handle *handle, enum txn_type type,
struct msg_desc *req_desc, void *req, unsigned int req_len,
struct msg_desc *resp_desc, void *resp, unsigned int resp_len,
void (*resp_cb)(struct qmi_handle *handle,
unsigned int msg_id, void *msg,
void *resp_cb_data, int stat),
void *resp_cb_data)
{
struct qmi_txn *txn_handle;
int rc, encoded_req_len;
void *encoded_req;
if (!handle || !handle->dest_info ||
!req_desc || !resp_desc || !resp)
return -EINVAL;
if ((!req && req_len) || (!req_len && req))
return -EINVAL;
mutex_lock(&handle->handle_lock);
if (handle->handle_reset) {
mutex_unlock(&handle->handle_lock);
return -ENETRESET;
}
/* Allocate Transaction Info */
txn_handle = kzalloc(sizeof(struct qmi_txn), GFP_KERNEL);
if (!txn_handle) {
pr_err("%s: Failed to allocate txn handle\n", __func__);
mutex_unlock(&handle->handle_lock);
return -ENOMEM;
}
txn_handle->type = type;
INIT_LIST_HEAD(&txn_handle->list);
init_waitqueue_head(&txn_handle->wait_q);
/* Cache the parameters passed & mark it as sync*/
txn_handle->handle = handle;
txn_handle->resp_desc = resp_desc;
txn_handle->resp = resp;
txn_handle->resp_len = resp_len;
txn_handle->resp_received = 0;
txn_handle->resp_cb = resp_cb;
txn_handle->resp_cb_data = resp_cb_data;
txn_handle->enc_data = NULL;
txn_handle->enc_data_len = 0;
/* Encode the request msg */
encoded_req_len = req_desc->max_msg_len + QMI_HEADER_SIZE;
encoded_req = kmalloc(encoded_req_len, GFP_KERNEL);
if (!encoded_req) {
pr_err("%s: Failed to allocate req_msg_buf\n", __func__);
rc = -ENOMEM;
goto encode_and_send_req_err1;
}
rc = qmi_kernel_encode(req_desc,
(void *)(encoded_req + QMI_HEADER_SIZE),
req_desc->max_msg_len, req);
if (rc < 0) {
pr_err("%s: Encode Failure %d\n", __func__, rc);
goto encode_and_send_req_err2;
}
encoded_req_len = rc;
/* Encode the header & Add to the txn_list */
if (!handle->next_txn_id)
handle->next_txn_id++;
txn_handle->txn_id = handle->next_txn_id++;
encode_qmi_header(encoded_req, QMI_REQUEST_CONTROL_FLAG,
txn_handle->txn_id, req_desc->msg_id,
encoded_req_len);
encoded_req_len += QMI_HEADER_SIZE;
/*
* Check if this port has transactions queued to its pending list
* and if there are any pending transactions then add the current
* transaction to the pending list rather than sending it. This avoids
* out-of-order message transfers.
*/
if (!list_empty(&handle->pending_txn_list)) {
rc = -EAGAIN;
goto append_pend_txn;
}
list_add_tail(&txn_handle->list, &handle->txn_list);
/* Send the request */
rc = msm_ipc_router_send_msg((struct msm_ipc_port *)(handle->src_port),
(struct msm_ipc_addr *)handle->dest_info,
encoded_req, encoded_req_len);
append_pend_txn:
if (rc == -EAGAIN) {
txn_handle->enc_data = encoded_req;
txn_handle->enc_data_len = encoded_req_len;
if (list_empty(&handle->pending_txn_list))
list_del(&txn_handle->list);
list_add_tail(&txn_handle->list, &handle->pending_txn_list);
if (ret_txn_handle)
*ret_txn_handle = txn_handle;
mutex_unlock(&handle->handle_lock);
return 0;
}
if (rc < 0) {
pr_err("%s: send_msg failed %d\n", __func__, rc);
goto encode_and_send_req_err3;
}
mutex_unlock(&handle->handle_lock);
kfree(encoded_req);
if (ret_txn_handle)
*ret_txn_handle = txn_handle;
return 0;
encode_and_send_req_err3:
list_del(&txn_handle->list);
encode_and_send_req_err2:
kfree(encoded_req);
encode_and_send_req_err1:
kfree(txn_handle);
mutex_unlock(&handle->handle_lock);
return rc;
}
int qmi_send_req_wait(struct qmi_handle *handle,
struct msg_desc *req_desc,
void *req, unsigned int req_len,
struct msg_desc *resp_desc,
void *resp, unsigned int resp_len,
unsigned long timeout_ms)
{
struct qmi_txn *txn_handle = NULL;
int rc;
/* Encode and send the request */
rc = qmi_encode_and_send_req(&txn_handle, handle, QMI_SYNC_TXN,
req_desc, req, req_len,
resp_desc, resp, resp_len,
NULL, NULL);
if (rc < 0) {
pr_err("%s: Error encode & send req: %d\n", __func__, rc);
return rc;
}
/* Wait for the response */
if (!timeout_ms) {
wait_event(txn_handle->wait_q,
(txn_handle->resp_received ||
handle->handle_reset ||
(txn_handle->send_stat < 0)));
} else {
rc = wait_event_timeout(txn_handle->wait_q,
(txn_handle->resp_received ||
handle->handle_reset ||
(txn_handle->send_stat < 0)),
msecs_to_jiffies(timeout_ms));
if (rc == 0)
rc = -ETIMEDOUT;
}
mutex_lock(&handle->handle_lock);
if (!txn_handle->resp_received) {
pr_err("%s: Response Wait Error %d\n", __func__, rc);
if (handle->handle_reset)
rc = -ENETRESET;
if (rc >= 0)
rc = -EFAULT;
if (txn_handle->send_stat < 0)
rc = txn_handle->send_stat;
goto send_req_wait_err;
}
rc = 0;
send_req_wait_err:
list_del(&txn_handle->list);
kfree(txn_handle);
mutex_unlock(&handle->handle_lock);
wake_up(&handle->reset_waitq);
return rc;
}
EXPORT_SYMBOL(qmi_send_req_wait);
int qmi_send_req_nowait(struct qmi_handle *handle,
struct msg_desc *req_desc,
void *req, unsigned int req_len,
struct msg_desc *resp_desc,
void *resp, unsigned int resp_len,
void (*resp_cb)(struct qmi_handle *handle,
unsigned int msg_id, void *msg,
void *resp_cb_data, int stat),
void *resp_cb_data)
{
return qmi_encode_and_send_req(NULL, handle, QMI_ASYNC_TXN,
req_desc, req, req_len,
resp_desc, resp, resp_len,
resp_cb, resp_cb_data);
}
EXPORT_SYMBOL(qmi_send_req_nowait);
/**
* qmi_encode_and_send_resp() - Encode and send QMI response
* @handle: QMI service handle sending the response.
* @conn_h: Connection handle to which the response is sent.
* @req_h: Request handle for which the response is sent.
* @resp_desc: Message Descriptor describing the response structure.
* @resp: Response structure.
* @resp_len: Length of the response structure.
*
* @return: 0 on success, standard Linux error codes on failure.
*
* This function encodes and sends a response message from a service to
* a client identified from the connection handle. The request for which
* the response is sent is identified from the connection handle.
*
* This function must be called with handle->handle_lock locked.
*/
static int qmi_encode_and_send_resp(struct qmi_handle *handle,
struct qmi_svc_clnt_conn *conn_h, struct req_handle *req_h,
struct msg_desc *resp_desc, void *resp, unsigned int resp_len)
{
struct qmi_txn *txn_handle;
uint16_t cntl_flag;
int rc;
int encoded_resp_len;
void *encoded_resp;
if (handle->handle_reset) {
rc = -ENETRESET;
goto encode_and_send_resp_err0;
}
if (handle->handle_type != QMI_SERVICE_HANDLE ||
!verify_svc_clnt_conn(handle, conn_h) ||
(req_h && !verify_req_handle(conn_h, req_h))) {
rc = -EINVAL;
goto encode_and_send_resp_err0;
}
/* Allocate Transaction Info */
txn_handle = kzalloc(sizeof(struct qmi_txn), GFP_KERNEL);
if (!txn_handle) {
pr_err("%s: Failed to allocate txn handle\n", __func__);
rc = -ENOMEM;
goto encode_and_send_resp_err0;
}
INIT_LIST_HEAD(&txn_handle->list);
init_waitqueue_head(&txn_handle->wait_q);
txn_handle->handle = handle;
txn_handle->enc_data = NULL;
txn_handle->enc_data_len = 0;
/* Encode the response msg */
encoded_resp_len = resp_desc->max_msg_len + QMI_HEADER_SIZE;
encoded_resp = kmalloc(encoded_resp_len, GFP_KERNEL);
if (!encoded_resp) {
pr_err("%s: Failed to allocate resp_msg_buf\n", __func__);
rc = -ENOMEM;
goto encode_and_send_resp_err1;
}
rc = qmi_kernel_encode(resp_desc,
(void *)(encoded_resp + QMI_HEADER_SIZE),
resp_desc->max_msg_len, resp);
if (rc < 0) {
pr_err("%s: Encode Failure %d\n", __func__, rc);
goto encode_and_send_resp_err2;
}
encoded_resp_len = rc;
/* Encode the header & Add to the txn_list */
if (req_h) {
txn_handle->txn_id = req_h->txn_id;
cntl_flag = QMI_RESPONSE_CONTROL_FLAG;
} else {
if (!handle->next_txn_id)
handle->next_txn_id++;
txn_handle->txn_id = handle->next_txn_id++;
cntl_flag = QMI_INDICATION_CONTROL_FLAG;
}
encode_qmi_header(encoded_resp, cntl_flag,
txn_handle->txn_id, resp_desc->msg_id,
encoded_resp_len);
encoded_resp_len += QMI_HEADER_SIZE;
/*
* Check if this svc_clnt has transactions queued to its pending list
* and if there are any pending transactions then add the current
* transaction to the pending list rather than sending it. This avoids
* out-of-order message transfers.
*/
mutex_lock(&conn_h->pending_txn_lock);
if (list_empty(&conn_h->pending_txn_list))
rc = msm_ipc_router_send_msg(
(struct msm_ipc_port *)(handle->src_port),
(struct msm_ipc_addr *)conn_h->clnt_addr,
encoded_resp, encoded_resp_len);
else
rc = -EAGAIN;
if (req_h)
rmv_req_handle(req_h);
if (rc == -EAGAIN) {
txn_handle->enc_data = encoded_resp;
txn_handle->enc_data_len = encoded_resp_len;
list_add_tail(&txn_handle->list, &conn_h->pending_txn_list);
mutex_unlock(&conn_h->pending_txn_lock);
return 0;
}
mutex_unlock(&conn_h->pending_txn_lock);
if (rc < 0)
pr_err("%s: send_msg failed %d\n", __func__, rc);
encode_and_send_resp_err2:
kfree(encoded_resp);
encode_and_send_resp_err1:
kfree(txn_handle);
encode_and_send_resp_err0:
return rc;
}
/**
* qmi_send_resp() - Send response to a request
* @handle: QMI handle from which the response is sent.
* @clnt: Client to which the response is sent.
* @req_handle: Request for which the response is sent.
* @resp_desc: Descriptor explaining the response structure.
* @resp: Pointer to the response structure.
* @resp_len: Length of the response structure.
*
* @return: 0 on success, < 0 on error.
*/
int qmi_send_resp(struct qmi_handle *handle, void *conn_handle,
void *req_handle, struct msg_desc *resp_desc,
void *resp, unsigned int resp_len)
{
int rc;
struct qmi_svc_clnt_conn *conn_h;
struct req_handle *req_h;
if (!handle || !conn_handle || !req_handle ||
!resp_desc || !resp || !resp_len)
return -EINVAL;
conn_h = (struct qmi_svc_clnt_conn *)conn_handle;
req_h = (struct req_handle *)req_handle;
mutex_lock(&handle->handle_lock);
rc = qmi_encode_and_send_resp(handle, conn_h, req_h,
resp_desc, resp, resp_len);
if (rc < 0)
pr_err("%s: Error encoding and sending response\n", __func__);
mutex_unlock(&handle->handle_lock);
return rc;
}
EXPORT_SYMBOL(qmi_send_resp);
/**
* qmi_send_resp_from_cb() - Send response to a request from request_cb
* @handle: QMI handle from which the response is sent.
* @clnt: Client to which the response is sent.
* @req_handle: Request for which the response is sent.
* @resp_desc: Descriptor explaining the response structure.
* @resp: Pointer to the response structure.
* @resp_len: Length of the response structure.
*
* @return: 0 on success, < 0 on error.
*/
int qmi_send_resp_from_cb(struct qmi_handle *handle, void *conn_handle,
void *req_handle, struct msg_desc *resp_desc,
void *resp, unsigned int resp_len)
{
int rc;
struct qmi_svc_clnt_conn *conn_h;
struct req_handle *req_h;
if (!handle || !conn_handle || !req_handle ||
!resp_desc || !resp || !resp_len)
return -EINVAL;
conn_h = (struct qmi_svc_clnt_conn *)conn_handle;
req_h = (struct req_handle *)req_handle;
rc = qmi_encode_and_send_resp(handle, conn_h, req_h,
resp_desc, resp, resp_len);
if (rc < 0)
pr_err("%s: Error encoding and sending response\n", __func__);
return rc;
}
EXPORT_SYMBOL(qmi_send_resp_from_cb);
/**
* qmi_send_ind() - Send unsolicited event/indication to a client
* @handle: QMI handle from which the indication is sent.
* @clnt: Client to which the indication is sent.
* @ind_desc: Descriptor explaining the indication structure.
* @ind: Pointer to the indication structure.
* @ind_len: Length of the indication structure.
*
* @return: 0 on success, < 0 on error.
*/
int qmi_send_ind(struct qmi_handle *handle, void *conn_handle,
struct msg_desc *ind_desc, void *ind, unsigned int ind_len)
{
int rc = 0;
struct qmi_svc_clnt_conn *conn_h;
if (!handle || !conn_handle || !ind_desc)
return -EINVAL;
if ((!ind && ind_len) || (ind && !ind_len))
return -EINVAL;
conn_h = (struct qmi_svc_clnt_conn *)conn_handle;
mutex_lock(&handle->handle_lock);
rc = qmi_encode_and_send_resp(handle, conn_h, NULL,
ind_desc, ind, ind_len);
if (rc < 0)
pr_err("%s: Error encoding and sending ind.\n", __func__);
mutex_unlock(&handle->handle_lock);
return rc;
}
EXPORT_SYMBOL(qmi_send_ind);
/**
* qmi_send_ind_from_cb() - Send indication to a client from registration_cb
* @handle: QMI handle from which the indication is sent.
* @clnt: Client to which the indication is sent.
* @ind_desc: Descriptor explaining the indication structure.
* @ind: Pointer to the indication structure.
* @ind_len: Length of the indication structure.
*
* @return: 0 on success, < 0 on error.
*/
int qmi_send_ind_from_cb(struct qmi_handle *handle, void *conn_handle,
struct msg_desc *ind_desc, void *ind, unsigned int ind_len)
{
int rc = 0;
struct qmi_svc_clnt_conn *conn_h;
if (!handle || !conn_handle || !ind_desc)
return -EINVAL;
if ((!ind && ind_len) || (ind && !ind_len))
return -EINVAL;
conn_h = (struct qmi_svc_clnt_conn *)conn_handle;
rc = qmi_encode_and_send_resp(handle, conn_h, NULL,
ind_desc, ind, ind_len);
if (rc < 0)
pr_err("%s: Error encoding and sending ind.\n", __func__);
return rc;
}
EXPORT_SYMBOL(qmi_send_ind_from_cb);
/**
* translate_err_code() - Translate Linux error codes into QMI error codes
* @err: Standard Linux error codes to be translated.
*
* @return: Return QMI error code.
*/
static int translate_err_code(int err)
{
int rc;
switch (err) {
case -ECONNREFUSED:
rc = QMI_ERR_CLIENT_IDS_EXHAUSTED_V01;
break;
case -EBADMSG:
rc = QMI_ERR_ENCODING_V01;
break;
case -ENOMEM:
rc = QMI_ERR_NO_MEMORY_V01;
break;
case -EOPNOTSUPP:
rc = QMI_ERR_MALFORMED_MSG_V01;
break;
case -ENOTSUPP:
rc = QMI_ERR_NOT_SUPPORTED_V01;
break;
default:
rc = QMI_ERR_INTERNAL_V01;
break;
}
return rc;
}
/**
* send_err_resp() - Send the error response
* @handle: Service handle from which the response is sent.
* @conn_h: Client<->Service connection on which the response is sent.
* @addr: Client address to which the error response is sent.
* @msg_id: Request message id for which the error response is sent.
* @txn_id: Request Transaction ID for which the error response is sent.
* @err: Error code to be sent.
*
* @return: 0 on success, standard Linux error codes on failure.
*
* This function is used to send an error response from within the QMI
* service interface. This function is called when the service returns
* an error to the QMI interface while handling a request.
*/
static int send_err_resp(struct qmi_handle *handle,
struct qmi_svc_clnt_conn *conn_h, void *addr,
uint16_t msg_id, uint16_t txn_id, int err)
{
struct qmi_response_type_v01 err_resp;
struct qmi_txn *txn_handle;
struct msm_ipc_addr *dest_addr;
int rc;
int encoded_resp_len;
void *encoded_resp;
if (handle->handle_reset)
return -ENETRESET;
err_resp.result = QMI_RESULT_FAILURE_V01;
err_resp.error = translate_err_code(err);
/* Allocate Transaction Info */
txn_handle = kzalloc(sizeof(struct qmi_txn), GFP_KERNEL);
if (!txn_handle) {
pr_err("%s: Failed to allocate txn handle\n", __func__);
return -ENOMEM;
}
INIT_LIST_HEAD(&txn_handle->list);
init_waitqueue_head(&txn_handle->wait_q);
txn_handle->handle = handle;
txn_handle->enc_data = NULL;
txn_handle->enc_data_len = 0;
/* Encode the response msg */
encoded_resp_len = err_resp_desc.max_msg_len + QMI_HEADER_SIZE;
encoded_resp = kmalloc(encoded_resp_len, GFP_KERNEL);
if (!encoded_resp) {
pr_err("%s: Failed to allocate resp_msg_buf\n", __func__);
rc = -ENOMEM;
goto encode_and_send_err_resp_err0;
}
rc = qmi_kernel_encode(&err_resp_desc,
(void *)(encoded_resp + QMI_HEADER_SIZE),
err_resp_desc.max_msg_len, &err_resp);
if (rc < 0) {
pr_err("%s: Encode Failure %d\n", __func__, rc);
goto encode_and_send_err_resp_err1;
}
encoded_resp_len = rc;
/* Encode the header & Add to the txn_list */
txn_handle->txn_id = txn_id;
encode_qmi_header(encoded_resp, QMI_RESPONSE_CONTROL_FLAG,
txn_handle->txn_id, msg_id,
encoded_resp_len);
encoded_resp_len += QMI_HEADER_SIZE;
/*
* Check if this svc_clnt has transactions queued to its pending list
* and if there are any pending transactions then add the current
* transaction to the pending list rather than sending it. This avoids
* out-of-order message transfers.
*/
if (!conn_h) {
dest_addr = (struct msm_ipc_addr *)addr;
goto tx_err_resp;
}
mutex_lock(&conn_h->pending_txn_lock);
dest_addr = (struct msm_ipc_addr *)conn_h->clnt_addr;
if (!list_empty(&conn_h->pending_txn_list)) {
rc = -EAGAIN;
goto queue_err_resp;
}
tx_err_resp:
rc = msm_ipc_router_send_msg(
(struct msm_ipc_port *)(handle->src_port),
dest_addr, encoded_resp, encoded_resp_len);
queue_err_resp:
if (rc == -EAGAIN && conn_h) {
txn_handle->enc_data = encoded_resp;
txn_handle->enc_data_len = encoded_resp_len;
list_add_tail(&txn_handle->list, &conn_h->pending_txn_list);
mutex_unlock(&conn_h->pending_txn_lock);
return 0;
}
if (conn_h)
mutex_unlock(&conn_h->pending_txn_lock);
if (rc < 0)
pr_err("%s: send_msg failed %d\n", __func__, rc);
encode_and_send_err_resp_err1:
kfree(encoded_resp);
encode_and_send_err_resp_err0:
kfree(txn_handle);
return rc;
}
/**
* handle_qmi_request() - Handle the QMI request
* @handle: QMI service handle on which the request has arrived.
* @req_msg: Request message to be handled.
* @txn_id: Transaction ID of the request message.
* @msg_id: Message ID of the request message.
* @msg_len: Message Length of the request message.
* @src_addr: Address of the source which sent the request.
* @src_addr_len: Length of the source address.
*
* @return: 0 on success, standard Linux error codes on failure.
*/
static int handle_qmi_request(struct qmi_handle *handle,
unsigned char *req_msg, uint16_t txn_id,
uint16_t msg_id, uint16_t msg_len,
void *src_addr, size_t src_addr_len)
{
struct qmi_svc_clnt_conn *conn_h;
struct msg_desc *req_desc = NULL;
void *req_struct = NULL;
unsigned int req_struct_len = 0;
struct req_handle *req_h = NULL;
int rc = 0;
if (handle->handle_type != QMI_SERVICE_HANDLE)
return -EOPNOTSUPP;
conn_h = find_svc_clnt_conn(handle, src_addr, src_addr_len);
if (conn_h)
goto decode_req;
/* New client, establish a connection */
conn_h = add_svc_clnt_conn(handle, src_addr, src_addr_len);
if (!conn_h) {
pr_err("%s: Error adding a new conn_h\n", __func__);
rc = -ENOMEM;
goto out_handle_req;
}
rc = handle->svc_ops_options->connect_cb(handle, conn_h);
if (rc < 0) {
pr_err("%s: Error accepting new client\n", __func__);
rmv_svc_clnt_conn(conn_h);
conn_h = NULL;
goto out_handle_req;
}
decode_req:
if (!msg_len)
goto process_req;
req_struct_len = handle->svc_ops_options->req_desc_cb(msg_id,
&req_desc);
if (!req_desc || req_struct_len <= 0) {
pr_err("%s: Error getting req_desc for msg_id %d\n",
__func__, msg_id);
rc = -ENOTSUPP;
goto out_handle_req;
}
req_struct = kzalloc(req_struct_len, GFP_KERNEL);
if (!req_struct) {
pr_err("%s: Error allocating request struct\n", __func__);
rc = -ENOMEM;
goto out_handle_req;
}
rc = qmi_kernel_decode(req_desc, req_struct,
(void *)(req_msg + QMI_HEADER_SIZE), msg_len);
if (rc < 0) {
pr_err("%s: Error decoding msg_id %d\n", __func__, msg_id);
rc = -EBADMSG;
goto out_handle_req;
}
process_req:
req_h = add_req_handle(conn_h, msg_id, txn_id);
if (!req_h) {
pr_err("%s: Error adding new request handle\n", __func__);
rc = -ENOMEM;
goto out_handle_req;
}
rc = handle->svc_ops_options->req_cb(handle, conn_h, req_h,
msg_id, req_struct);
if (rc < 0) {
pr_err("%s: Error while req_cb\n", __func__);
/* Check if the error is before or after sending a response */
if (verify_req_handle(conn_h, req_h))
rmv_req_handle(req_h);
else
rc = 0;
}
out_handle_req:
kfree(req_struct);
if (rc < 0)
send_err_resp(handle, conn_h, src_addr, msg_id, txn_id, rc);
return rc;
}
static struct qmi_txn *find_txn_handle(struct qmi_handle *handle,
uint16_t txn_id)
{
struct qmi_txn *txn_handle;
list_for_each_entry(txn_handle, &handle->txn_list, list) {
if (txn_handle->txn_id == txn_id)
return txn_handle;
}
return NULL;
}
static int handle_qmi_response(struct qmi_handle *handle,
unsigned char *resp_msg, uint16_t txn_id,
uint16_t msg_id, uint16_t msg_len)
{
struct qmi_txn *txn_handle;
int rc;
/* Find the transaction handle */
txn_handle = find_txn_handle(handle, txn_id);
if (!txn_handle) {
pr_err("%s Response received for non-existent txn_id %d\n",
__func__, txn_id);
return -EINVAL;
}
/* Decode the message */
rc = qmi_kernel_decode(txn_handle->resp_desc, txn_handle->resp,
(void *)(resp_msg + QMI_HEADER_SIZE), msg_len);
if (rc < 0) {
pr_err("%s: Response Decode Failure <%d: %d: %d> rc: %d\n",
__func__, txn_id, msg_id, msg_len, rc);
wake_up(&txn_handle->wait_q);
if (txn_handle->type == QMI_ASYNC_TXN) {
list_del(&txn_handle->list);
kfree(txn_handle);
}
return rc;
}
/* Handle async or sync resp */
switch (txn_handle->type) {
case QMI_SYNC_TXN:
txn_handle->resp_received = 1;
wake_up(&txn_handle->wait_q);
rc = 0;
break;
case QMI_ASYNC_TXN:
if (txn_handle->resp_cb)
txn_handle->resp_cb(txn_handle->handle, msg_id,
txn_handle->resp,
txn_handle->resp_cb_data, 0);
list_del(&txn_handle->list);
kfree(txn_handle);
rc = 0;
break;
default:
pr_err("%s: Unrecognized transaction type\n", __func__);
return -EFAULT;
}
return rc;
}
static int handle_qmi_indication(struct qmi_handle *handle, void *msg,
unsigned int msg_id, unsigned int msg_len)
{
if (handle->ind_cb)
handle->ind_cb(handle, msg_id, msg,
msg_len, handle->ind_cb_priv);
return 0;
}
int qmi_recv_msg(struct qmi_handle *handle)
{
unsigned int recv_msg_len;
unsigned char *recv_msg = NULL;
struct msm_ipc_addr src_addr = {0};
unsigned char cntl_flag;
uint16_t txn_id, msg_id, msg_len;
int rc;
if (!handle)
return -EINVAL;
mutex_lock(&handle->handle_lock);
if (handle->handle_reset) {
mutex_unlock(&handle->handle_lock);
return -ENETRESET;
}
/* Read the messages */
rc = msm_ipc_router_read_msg((struct msm_ipc_port *)(handle->src_port),
&src_addr, &recv_msg, &recv_msg_len);
if (rc == -ENOMSG) {
mutex_unlock(&handle->handle_lock);
return rc;
}
if (rc < 0) {
pr_err("%s: Read failed %d\n", __func__, rc);
mutex_unlock(&handle->handle_lock);
return rc;
}
/* Decode the header & Handle the req, resp, indication message */
decode_qmi_header(recv_msg, &cntl_flag, &txn_id, &msg_id, &msg_len);
switch (cntl_flag) {
case QMI_REQUEST_CONTROL_FLAG:
rc = handle_qmi_request(handle, recv_msg, txn_id, msg_id,
msg_len, &src_addr, sizeof(src_addr));
break;
case QMI_RESPONSE_CONTROL_FLAG:
rc = handle_qmi_response(handle, recv_msg,
txn_id, msg_id, msg_len);
break;
case QMI_INDICATION_CONTROL_FLAG:
rc = handle_qmi_indication(handle, recv_msg, msg_id, msg_len);
break;
default:
rc = -EFAULT;
pr_err("%s: Unsupported message type %d\n",
__func__, cntl_flag);
break;
}
kfree(recv_msg);
mutex_unlock(&handle->handle_lock);
return rc;
}
EXPORT_SYMBOL(qmi_recv_msg);
int qmi_connect_to_service(struct qmi_handle *handle,
uint32_t service_id,
uint32_t service_vers,
uint32_t service_ins)
{
struct msm_ipc_port_name svc_name;
struct msm_ipc_server_info svc_info;
struct msm_ipc_addr *svc_dest_addr;
int rc;
uint32_t instance_id;
if (!handle)
return -EINVAL;
svc_dest_addr = kzalloc(sizeof(struct msm_ipc_addr),
GFP_KERNEL);
if (!svc_dest_addr) {
pr_err("%s: Failure allocating memory\n", __func__);
return -ENOMEM;
}
instance_id = BUILD_INSTANCE_ID(service_vers, service_ins);
svc_name.service = service_id;
svc_name.instance = instance_id;
rc = msm_ipc_router_lookup_server_name(&svc_name, &svc_info,
1, LOOKUP_MASK);
if (rc <= 0) {
pr_err("%s: Server %08x:%08x not found\n",
__func__, service_id, instance_id);
return -ENODEV;
}
svc_dest_addr->addrtype = MSM_IPC_ADDR_ID;
svc_dest_addr->addr.port_addr.node_id = svc_info.node_id;
svc_dest_addr->addr.port_addr.port_id = svc_info.port_id;
mutex_lock(&handle->handle_lock);
if (handle->handle_reset) {
mutex_unlock(&handle->handle_lock);
return -ENETRESET;
}
handle->dest_info = svc_dest_addr;
mutex_unlock(&handle->handle_lock);
return 0;
}
EXPORT_SYMBOL(qmi_connect_to_service);
static struct svc_event_nb *find_svc_event_nb_by_name(const char *name)
{
struct svc_event_nb *temp;
list_for_each_entry(temp, &svc_event_nb_list, list) {
if (!strncmp(name, temp->pdriver_name,
sizeof(temp->pdriver_name)))
return temp;
}
return NULL;
}
static int qmi_svc_event_probe(struct platform_device *pdev)
{
struct svc_event_nb *temp;
unsigned long flags;
mutex_lock(&svc_event_nb_list_lock);
temp = find_svc_event_nb_by_name(pdev->name);
if (!temp) {
mutex_unlock(&svc_event_nb_list_lock);
return -EINVAL;
}
spin_lock_irqsave(&temp->nb_lock, flags);
temp->svc_avail++;
raw_notifier_call_chain(&temp->svc_event_rcvr_list,
QMI_SERVER_ARRIVE, NULL);
spin_unlock_irqrestore(&temp->nb_lock, flags);
mutex_unlock(&svc_event_nb_list_lock);
return 0;
}
static int qmi_svc_event_remove(struct platform_device *pdev)
{
struct svc_event_nb *temp;
unsigned long flags;
mutex_lock(&svc_event_nb_list_lock);
temp = find_svc_event_nb_by_name(pdev->name);
if (!temp) {
mutex_unlock(&svc_event_nb_list_lock);
return -EINVAL;
}
spin_lock_irqsave(&temp->nb_lock, flags);
temp->svc_avail--;
raw_notifier_call_chain(&temp->svc_event_rcvr_list,
QMI_SERVER_EXIT, NULL);
spin_unlock_irqrestore(&temp->nb_lock, flags);
mutex_unlock(&svc_event_nb_list_lock);
return 0;
}
static struct svc_event_nb *find_svc_event_nb(uint32_t service_id,
uint32_t instance_id)
{
struct svc_event_nb *temp;
list_for_each_entry(temp, &svc_event_nb_list, list) {
if (temp->service_id == service_id &&
temp->instance_id == instance_id)
return temp;
}
return NULL;
}
static struct svc_event_nb *find_and_add_svc_event_nb(uint32_t service_id,
uint32_t instance_id)
{
struct svc_event_nb *temp;
int ret;
mutex_lock(&svc_event_nb_list_lock);
temp = find_svc_event_nb(service_id, instance_id);
if (temp) {
mutex_unlock(&svc_event_nb_list_lock);
return temp;
}
temp = kzalloc(sizeof(struct svc_event_nb), GFP_KERNEL);
if (!temp) {
mutex_unlock(&svc_event_nb_list_lock);
pr_err("%s: Failed to alloc notifier block\n", __func__);
return temp;
}
spin_lock_init(&temp->nb_lock);
temp->service_id = service_id;
temp->instance_id = instance_id;
INIT_LIST_HEAD(&temp->list);
temp->svc_driver.probe = qmi_svc_event_probe;
temp->svc_driver.remove = qmi_svc_event_remove;
scnprintf(temp->pdriver_name, sizeof(temp->pdriver_name),
"QMI%08x:%08x", service_id, instance_id);
temp->svc_driver.driver.name = temp->pdriver_name;
RAW_INIT_NOTIFIER_HEAD(&temp->svc_event_rcvr_list);
list_add_tail(&temp->list, &svc_event_nb_list);
mutex_unlock(&svc_event_nb_list_lock);
ret = platform_driver_register(&temp->svc_driver);
if (ret < 0) {
pr_err("%s: Failed pdriver register\n", __func__);
mutex_lock(&svc_event_nb_list_lock);
list_del(&temp->list);
mutex_unlock(&svc_event_nb_list_lock);
kfree(temp);
temp = NULL;
}
return temp;
}
int qmi_svc_event_notifier_register(uint32_t service_id,
uint32_t service_vers,
uint32_t service_ins,
struct notifier_block *nb)
{
struct svc_event_nb *temp;
unsigned long flags;
int ret;
uint32_t instance_id;
instance_id = BUILD_INSTANCE_ID(service_vers, service_ins);
temp = find_and_add_svc_event_nb(service_id, instance_id);
if (!temp)
return -EFAULT;
mutex_lock(&svc_event_nb_list_lock);
temp = find_svc_event_nb(service_id, instance_id);
if (!temp) {
mutex_unlock(&svc_event_nb_list_lock);
return -EFAULT;
}
spin_lock_irqsave(&temp->nb_lock, flags);
if (temp->svc_avail)
nb->notifier_call(nb, QMI_SERVER_ARRIVE, NULL);
ret = raw_notifier_chain_register(&temp->svc_event_rcvr_list, nb);
spin_unlock_irqrestore(&temp->nb_lock, flags);
mutex_unlock(&svc_event_nb_list_lock);
return ret;
}
EXPORT_SYMBOL(qmi_svc_event_notifier_register);
int qmi_svc_event_notifier_unregister(uint32_t service_id,
uint32_t service_vers,
uint32_t service_ins,
struct notifier_block *nb)
{
int ret;
struct svc_event_nb *temp;
unsigned long flags;
uint32_t instance_id;
instance_id = BUILD_INSTANCE_ID(service_vers, service_ins);
mutex_lock(&svc_event_nb_list_lock);
temp = find_svc_event_nb(service_id, instance_id);
if (!temp) {
mutex_unlock(&svc_event_nb_list_lock);
return -EINVAL;
}
spin_lock_irqsave(&temp->nb_lock, flags);
ret = raw_notifier_chain_unregister(&temp->svc_event_rcvr_list, nb);
spin_unlock_irqrestore(&temp->nb_lock, flags);
mutex_unlock(&svc_event_nb_list_lock);
return ret;
}
EXPORT_SYMBOL(qmi_svc_event_notifier_unregister);
/**
* qmi_svc_register() - Register a QMI service with a QMI handle
* @handle: QMI handle on which the service has to be registered.
* @ops_options: Service specific operations and options.
*
* @return: 0 if successfully registered, < 0 on error.
*/
int qmi_svc_register(struct qmi_handle *handle, void *ops_options)
{
struct qmi_svc_ops_options *svc_ops_options;
struct msm_ipc_addr svc_name;
int rc;
uint32_t instance_id;
svc_ops_options = (struct qmi_svc_ops_options *)ops_options;
if (!handle || !svc_ops_options)
return -EINVAL;
/* Check if the required elements of opts_options are filled */
if (!svc_ops_options->service_id || !svc_ops_options->service_vers ||
!svc_ops_options->connect_cb || !svc_ops_options->disconnect_cb ||
!svc_ops_options->req_desc_cb || !svc_ops_options->req_cb)
return -EINVAL;
mutex_lock(&handle->handle_lock);
/* Check if another service/client is registered in that handle */
if (handle->handle_type == QMI_SERVICE_HANDLE || handle->dest_info) {
mutex_unlock(&handle->handle_lock);
return -EBUSY;
}
INIT_LIST_HEAD(&handle->conn_list);
mutex_unlock(&handle->handle_lock);
/*
* Unlocked the handle_lock, because NEW_SERVER message will end up
* in this handle's control port, which requires holding the same
* mutex. Also it is safe to call register_server unlocked.
*/
/* Register the service */
instance_id = ((svc_ops_options->service_vers & 0xFF) |
((svc_ops_options->service_ins & 0xFF) << 8));
svc_name.addrtype = MSM_IPC_ADDR_NAME;
svc_name.addr.port_name.service = svc_ops_options->service_id;
svc_name.addr.port_name.instance = instance_id;
rc = msm_ipc_router_register_server(
(struct msm_ipc_port *)handle->src_port, &svc_name);
if (rc < 0) {
pr_err("%s: Error %d registering QMI service %08x:%08x\n",
__func__, rc, svc_ops_options->service_id,
instance_id);
return rc;
}
mutex_lock(&handle->handle_lock);
handle->svc_ops_options = svc_ops_options;
handle->handle_type = QMI_SERVICE_HANDLE;
mutex_unlock(&handle->handle_lock);
return rc;
}
EXPORT_SYMBOL(qmi_svc_register);
/**
* qmi_svc_unregister() - Unregister the service from a QMI handle
* @handle: QMI handle from which the service has to be unregistered.
*
* return: 0 on success, < 0 on error.
*/
int qmi_svc_unregister(struct qmi_handle *handle)
{
struct qmi_svc_clnt_conn *conn_h, *temp_conn_h;
if (!handle || handle->handle_type != QMI_SERVICE_HANDLE)
return -EINVAL;
mutex_lock(&handle->handle_lock);
handle->handle_type = QMI_CLIENT_HANDLE;
mutex_unlock(&handle->handle_lock);
/*
* Unlocked the handle_lock, because REMOVE_SERVER message will end up
* in this handle's control port, which requires holding the same
* mutex. Also it is safe to call register_server unlocked.
*/
msm_ipc_router_unregister_server(
(struct msm_ipc_port *)handle->src_port);
mutex_lock(&handle->handle_lock);
list_for_each_entry_safe(conn_h, temp_conn_h,
&handle->conn_list, list)
rmv_svc_clnt_conn(conn_h);
mutex_unlock(&handle->handle_lock);
return 0;
}
EXPORT_SYMBOL(qmi_svc_unregister);
MODULE_DESCRIPTION("MSM QMI Interface");
MODULE_LICENSE("GPL v2");
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