source: mainline/uspace/lib/c/generic/devman.c@ b72efe8

/*
 * Copyright (c) 2007 Josef Cejka
 * Copyright (c) 2009 Jiri Svoboda
 * Copyright (c) 2010 Lenka Trochtova
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#include <adt/list.h>
#include <str.h>
#include <ipc/services.h>
#include <ns.h>
#include <ipc/devman.h>
#include <devman.h>
#include <fibril_synch.h>
#include <async.h>
#include <errno.h>
#include <malloc.h>
#include <bool.h>

static FIBRIL_MUTEX_INITIALIZE(devman_driver_block_mutex);
static FIBRIL_MUTEX_INITIALIZE(devman_client_block_mutex);

static FIBRIL_MUTEX_INITIALIZE(devman_driver_mutex);
static FIBRIL_MUTEX_INITIALIZE(devman_client_mutex);

static async_sess_t *devman_driver_block_sess = NULL;
static async_sess_t *devman_client_block_sess = NULL;

static async_sess_t *devman_driver_sess = NULL;
static async_sess_t *devman_client_sess = NULL;

static void clone_session(fibril_mutex_t *mtx, async_sess_t *src,
    async_sess_t **dst)
{
        fibril_mutex_lock(mtx);
        
        if ((*dst == NULL) && (src != NULL))
                *dst = src;
        
        fibril_mutex_unlock(mtx);
}

/** Start an async exchange on the devman session (blocking).
 *
 * @param iface Device manager interface to choose
 *
 * @return New exchange.
 *
 */
async_exch_t *devman_exchange_begin_blocking(devman_interface_t iface)
{
        switch (iface) {
        case DEVMAN_DRIVER:
                fibril_mutex_lock(&devman_driver_block_mutex);
                
                while (devman_driver_block_sess == NULL) {
                        clone_session(&devman_driver_mutex, devman_driver_sess,
                            &devman_driver_block_sess);
                        
                        if (devman_driver_block_sess == NULL)
                                devman_driver_block_sess =
                                    service_connect_blocking(EXCHANGE_SERIALIZE,
                                    SERVICE_DEVMAN, DEVMAN_DRIVER, 0);
                }
                
                fibril_mutex_unlock(&devman_driver_block_mutex);
                
                clone_session(&devman_driver_mutex, devman_driver_block_sess,
                    &devman_driver_sess);
                
                return async_exchange_begin(devman_driver_block_sess);
        case DEVMAN_CLIENT:
                fibril_mutex_lock(&devman_client_block_mutex);
                
                while (devman_client_block_sess == NULL) {
                        clone_session(&devman_client_mutex, devman_client_sess,
                            &devman_client_block_sess);
                        
                        if (devman_client_block_sess == NULL)
                                devman_client_block_sess =
                                    service_connect_blocking(EXCHANGE_SERIALIZE,
                                    SERVICE_DEVMAN, DEVMAN_CLIENT, 0);
                }
                
                fibril_mutex_unlock(&devman_client_block_mutex);
                
                clone_session(&devman_client_mutex, devman_client_block_sess,
                    &devman_client_sess);
                
                return async_exchange_begin(devman_client_block_sess);
        default:
                return NULL;
        }
}

/** Start an async exchange on the devman session.
 *
 * @param iface Device manager interface to choose
 *
 * @return New exchange.
 *
 */
async_exch_t *devman_exchange_begin(devman_interface_t iface)
{
        switch (iface) {
        case DEVMAN_DRIVER:
                fibril_mutex_lock(&devman_driver_mutex);
                
                if (devman_driver_sess == NULL)
                        devman_driver_sess =
                            service_connect(EXCHANGE_SERIALIZE, SERVICE_DEVMAN,
                            DEVMAN_DRIVER, 0);
                
                fibril_mutex_unlock(&devman_driver_mutex);
                
                if (devman_driver_sess == NULL)
                        return NULL;
                
                return async_exchange_begin(devman_driver_sess);
        case DEVMAN_CLIENT:
                fibril_mutex_lock(&devman_client_mutex);
                
                if (devman_client_sess == NULL)
                        devman_client_sess =
                            service_connect(EXCHANGE_SERIALIZE, SERVICE_DEVMAN,
                            DEVMAN_CLIENT, 0);
                
                fibril_mutex_unlock(&devman_client_mutex);
                
                if (devman_client_sess == NULL)
                        return NULL;
                
                return async_exchange_begin(devman_client_sess);
        default:
                return NULL;
        }
}

/** Finish an async exchange on the devman session.
 *
 * @param exch Exchange to be finished.
 *
 */
void devman_exchange_end(async_exch_t *exch)
{
        async_exchange_end(exch);
}

/** Register running driver with device manager. */
int devman_driver_register(const char *name, async_client_conn_t conn)
{
        async_exch_t *exch = devman_exchange_begin_blocking(DEVMAN_DRIVER);
        
        ipc_call_t answer;
        aid_t req = async_send_2(exch, DEVMAN_DRIVER_REGISTER, 0, 0, &answer);
        sysarg_t retval = async_data_write_start(exch, name, str_size(name));
        
        devman_exchange_end(exch);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return retval;
        }
        
        async_set_client_connection(conn);
        
        exch = devman_exchange_begin(DEVMAN_DRIVER);
        async_connect_to_me(exch, 0, 0, 0, NULL, NULL);
        devman_exchange_end(exch);
        
        async_wait_for(req, &retval);
        return retval;
}

/** Add function to a device.
 *
 * Request devman to add a new function to the specified device owned by
 * this driver task.
 *
 * @param name      Name of the new function
 * @param ftype     Function type, fun_inner or fun_exposed
 * @param match_ids Match IDs (should be empty for fun_exposed)
 * @param devh      Devman handle of the device
 * @param funh      Place to store handle of the new function
 *
 * @return EOK on success or negative error code.
 *
 */
int devman_add_function(const char *name, fun_type_t ftype,
    match_id_list_t *match_ids, devman_handle_t devh, devman_handle_t *funh)
{
        int match_count = list_count(&match_ids->ids);
        async_exch_t *exch = devman_exchange_begin_blocking(DEVMAN_DRIVER);
        
        ipc_call_t answer;
        aid_t req = async_send_3(exch, DEVMAN_ADD_FUNCTION, (sysarg_t) ftype,
            devh, match_count, &answer);
        sysarg_t retval = async_data_write_start(exch, name, str_size(name));
        if (retval != EOK) {
                devman_exchange_end(exch);
                async_wait_for(req, NULL);
                return retval;
        }
        
        match_id_t *match_id = NULL;
        
        list_foreach(match_ids->ids, link) {
                match_id = list_get_instance(link, match_id_t, link);
                
                ipc_call_t answer2;
                aid_t req2 = async_send_1(exch, DEVMAN_ADD_MATCH_ID,
                    match_id->score, &answer2);
                retval = async_data_write_start(exch, match_id->id,
                    str_size(match_id->id));
                if (retval != EOK) {
                        devman_exchange_end(exch);
                        async_wait_for(req2, NULL);
                        async_wait_for(req, NULL);
                        return retval;
                }
                
                async_wait_for(req2, &retval);
                if (retval != EOK) {
                        devman_exchange_end(exch);
                        async_wait_for(req, NULL);
                        return retval;
                }
        }
        
        devman_exchange_end(exch);
        
        async_wait_for(req, &retval);
        if (retval == EOK) {
                if (funh != NULL)
                        *funh = (int) IPC_GET_ARG1(answer);
        } else {
                if (funh != NULL)
                        *funh = -1;
        }
        
        return retval;
}

int devman_add_device_to_class(devman_handle_t devman_handle,
    const char *class_name)
{
        async_exch_t *exch = devman_exchange_begin_blocking(DEVMAN_DRIVER);
        
        ipc_call_t answer;
        aid_t req = async_send_1(exch, DEVMAN_ADD_DEVICE_TO_CLASS,
            devman_handle, &answer);
        sysarg_t retval = async_data_write_start(exch, class_name,
            str_size(class_name));
        
        devman_exchange_end(exch);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return retval;
        }
        
        async_wait_for(req, &retval);
        return retval;
}

async_sess_t *devman_device_connect(exch_mgmt_t mgmt, devman_handle_t handle,
    unsigned int flags)
{
        async_sess_t *sess;
        
        if (flags & IPC_FLAG_BLOCKING)
                sess = service_connect_blocking(mgmt, SERVICE_DEVMAN,
                            DEVMAN_CONNECT_TO_DEVICE, handle);
        else
                sess = service_connect(mgmt, SERVICE_DEVMAN,
                            DEVMAN_CONNECT_TO_DEVICE, handle);
        
        return sess;
}

async_sess_t *devman_parent_device_connect(exch_mgmt_t mgmt,
    devman_handle_t handle, unsigned int flags)
{
        async_sess_t *sess;
        
        if (flags & IPC_FLAG_BLOCKING)
                sess = service_connect_blocking(mgmt, SERVICE_DEVMAN,
                            DEVMAN_CONNECT_TO_PARENTS_DEVICE, handle);
        else
                sess = service_connect(mgmt, SERVICE_DEVMAN,
                            DEVMAN_CONNECT_TO_PARENTS_DEVICE, handle);
        
        return sess;
}

int devman_device_get_handle(const char *pathname, devman_handle_t *handle,
    unsigned int flags)
{
        async_exch_t *exch;
        
        if (flags & IPC_FLAG_BLOCKING)
                exch = devman_exchange_begin_blocking(DEVMAN_CLIENT);
        else {
                exch = devman_exchange_begin(DEVMAN_CLIENT);
                if (exch == NULL)
                        return errno;
        }
        
        ipc_call_t answer;
        aid_t req = async_send_2(exch, DEVMAN_DEVICE_GET_HANDLE, flags, 0,
            &answer);
        sysarg_t retval = async_data_write_start(exch, pathname,
            str_size(pathname));
        
        devman_exchange_end(exch);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        if (retval != EOK) {
                if (handle != NULL)
                        *handle = (devman_handle_t) -1;
                
                return retval;
        }
        
        if (handle != NULL)
                *handle = (devman_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

int devman_device_get_handle_by_class(const char *classname,
    const char *devname, devman_handle_t *handle, unsigned int flags)
{
        async_exch_t *exch;
        
        if (flags & IPC_FLAG_BLOCKING)
                exch = devman_exchange_begin_blocking(DEVMAN_CLIENT);
        else {
                exch = devman_exchange_begin(DEVMAN_CLIENT);
                if (exch == NULL)
                        return errno;
        }
        
        ipc_call_t answer;
        aid_t req = async_send_1(exch, DEVMAN_DEVICE_GET_HANDLE_BY_CLASS,
            flags, &answer);
        sysarg_t retval = async_data_write_start(exch, classname,
            str_size(classname));
        
        if (retval != EOK) {
                devman_exchange_end(exch);
                async_wait_for(req, NULL);
                return retval;
        }
        
        retval = async_data_write_start(exch, devname,
            str_size(devname));
        
        devman_exchange_end(exch);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        if (retval != EOK) {
                if (handle != NULL)
                        *handle = (devman_handle_t) -1;
                
                return retval;
        }
        
        if (handle != NULL)
                *handle = (devman_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

int devman_get_device_path(devman_handle_t handle, char *path, size_t path_size)
{
        async_exch_t *exch = devman_exchange_begin(DEVMAN_CLIENT);
        if (exch == NULL)
                return errno;
        
        ipc_call_t answer;
        aid_t req = async_send_1(exch, DEVMAN_DEVICE_GET_DEVICE_PATH,
            handle, &answer);
        
        ipc_call_t data_request_call;
        aid_t data_request = async_data_read(exch, path, path_size,
            &data_request_call);
        
        devman_exchange_end(exch);
        
        if (data_request == 0) {
                async_wait_for(req, NULL);
                return ENOMEM;
        }
        
        sysarg_t data_request_rc;
        async_wait_for(data_request, &data_request_rc);
        
        sysarg_t opening_request_rc;
        async_wait_for(req, &opening_request_rc);
        
        if (data_request_rc != EOK) {
                /* Prefer the return code of the opening request. */
                if (opening_request_rc != EOK)
                        return (int) opening_request_rc;
                else
                        return (int) data_request_rc;
        }
        
        if (opening_request_rc != EOK)
                return (int) opening_request_rc;
        
        /* To be on the safe-side. */
        path[path_size - 1] = 0;
        size_t transferred_size = IPC_GET_ARG2(data_request_call);
        if (transferred_size >= path_size)
                return ELIMIT;
        
        /* Terminate the string (trailing 0 not send over IPC). */
        path[transferred_size] = 0;
        return EOK;
}

/** @}
 */