path: root/tools/mako/csd-daemon.c

/* csd-daemon.c
**
** Copyright 2013, Mozilla Corporation
**
** 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.
**     * Neither the name of The Android Open Source Project nor the names of
**       its contributors may be used to endorse or promote products derived
**       from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY Mozilla Corporation ``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 Android Open Source Project 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.
*/

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <dlfcn.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>

#define DEBUG 1
#include "common.h"

/* FIXME: we're always setting dmic + tty-off, is that always correct? */
#define ACDB_SETTINGS 0x12

struct state {
    int sockfd;
    int rx_dev, tx_dev;
    int start_voice;
    int disable_device;
};

static struct state state;

/* Based on prototypes in hardware/qcom/audio/hal/audio_hw.h */

int  (*acdb_loader_init_ACDB)();
void (*acdb_loader_deallocate_ACDB)();
void (*acdb_loader_send_audio_cal)(int, int);
void (*acdb_loader_send_voice_cal)(int, int);

int (*csd_client_init)(void);
int (*csd_client_deinit)(void);
int (*csd_client_disable_device)(void);
int (*csd_client_enable_device)(int, int, uint32_t);
int (*csd_client_volume)(int);
int (*csd_client_mic_mute)(int);
int (*csd_client_start_voice)(void);
int (*csd_client_stop_voice)(void);

static int init_lib(void)
{
    void *handle;

    handle = dlopen("/system/lib/libacdbloader.so", RTLD_NOW);

    acdb_loader_init_ACDB = dlsym(handle, "acdb_loader_init_ACDB");
    acdb_loader_deallocate_ACDB = dlsym(handle, "acdb_loader_deallocate_ACDB");
    acdb_loader_send_audio_cal = dlsym(handle, "acdb_loader_send_audio_cal");
    acdb_loader_send_voice_cal = dlsym(handle, "acdb_loader_send_voice_cal");

    if (!acdb_loader_init_ACDB || !acdb_loader_deallocate_ACDB ||
        !acdb_loader_send_audio_cal || !acdb_loader_send_voice_cal) {
        ERR("Could not find all acdb_loader_* functions\n");
        return -1;
    }

    handle = dlopen("/system/lib/libcsd-client.so", RTLD_NOW);

    csd_client_init = dlsym(handle, "csd_client_init");
    csd_client_deinit = dlsym(handle, "csd_client_deinit");
    csd_client_disable_device = dlsym(handle, "csd_client_disable_device");
    csd_client_enable_device = dlsym(handle, "csd_client_enable_device");
    csd_client_volume = dlsym(handle, "csd_client_volume");
    csd_client_mic_mute = dlsym(handle, "csd_client_mic_mute");
    csd_client_start_voice = dlsym(handle, "csd_client_start_voice");
    csd_client_stop_voice = dlsym(handle, "csd_client_stop_voice");

    if (!csd_client_init || !csd_client_deinit || !csd_client_disable_device ||
        !csd_client_enable_device || !csd_client_volume ||
        !csd_client_mic_mute || !csd_client_start_voice ||
        !csd_client_stop_voice) {
        ERR("Could not find all csd_client_* functions\n");
        return -1;
    }

    return 0;
}

static int init_daemon(void)
{
    struct stat st;
    struct sockaddr_un sa;

    state.rx_dev = state.tx_dev = -1;

    if (stat(DEFAULT_RUNTIME_DIR, &st) < 0) {
        if (errno != -ENOENT) {
            /* First run, try to create the directory */
            if (mkdir(DEFAULT_RUNTIME_DIR, 0700) < 0) {
                ERR("Could not create runtime directory\n");
                return -1;
            }
        } else {
            ERR("Could not access runtime directory\n");
            return -1;
        }
    }

    if ((state.sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
        ERR("Could not create socket\n");
        return -1;
    }

    sa.sun_family = AF_UNIX;
    snprintf(sa.sun_path, sizeof(sa.sun_path), DEFAULT_SOCKET_PATH);

    if (stat(DEFAULT_SOCKET_PATH, &st) == 0) {
        /* Either a daemon is already running or this is a stale socket */
        if (connect(state.sockfd, (struct sockaddr *) &sa, sizeof(sa)) < 0 &&
            errno == ECONNREFUSED) {
            DBG("Removing stale socket\n");
            unlink(DEFAULT_SOCKET_PATH);
        } else {
            ERR("Found existing socket, daemon already running?\n");
            close(state.sockfd);
            return -1;
        }
    }

    if (bind(state.sockfd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
        ERR("Could not bind address\n");
        return -1;
    }

    if (listen(state.sockfd, 1) < 0) {
        ERR("Could not start listening for connections\n");
        return -1;
    }

    return 0;
}

/* Return negative value to signal death (currently only returns 0 */
static int process(const char *command)
{
    int32_t ret = 0;

    if (strncmp(command, "enable-rx-device", 16) == 0) {
        if (sscanf(command, "%*s %d", &state.rx_dev) != 1) {
            ERR("Bad argument to enable-rx-device\n");
            goto out;
        }

        DBG("enable rx device: %d\n", state.rx_dev);

        /* Only enable device after we get both rx and tx device */
        if (state.rx_dev != -1 && state.tx_dev != -1) {
            ret = csd_client_enable_device(state.rx_dev, state.tx_dev, ACDB_SETTINGS);
            if (ret == 0 && state.start_voice) {
                state.start_voice = 0;
                ret = csd_client_start_voice();
            }
        }

    } else if (strncmp(command, "enable-tx-device", 16) == 0) {
        if (sscanf(command, "%*s %d", &state.tx_dev) != 1) {
            ERR("Bad argument to enable-tx-device\n");
            goto out;
        }

        DBG("enable tx device: %d\n", state.tx_dev);

        /* Only enable device after we get both rx and tx device */
        if (state.rx_dev != -1 && state.tx_dev != -1) {
            if (state.disable_device) {
                state.disable_device = 0;
                ret = csd_client_disable_device();
            }

            if (ret == 0) {
                ret = csd_client_enable_device(state.rx_dev, state.tx_dev,
                                               ACDB_SETTINGS);
            }

            if (ret == 0 && state.start_voice) {
                state.start_voice = 0;
                ret = csd_client_start_voice();
            }
        }

    } else if (strcmp(command, "disable-device") == 0) {
        /* We need to disable the device before an enable-device but _after_
         * stop-voice. Since we don't know what's coming next, we wait for
         * these to happen before actually executing the command. */
        state.disable_device = 1;

    } else if (strncmp(command, "volume", 6) == 0) {
        int volume;

        if (sscanf(command, "%*s %d", &volume) != 1) {
            ERR("Bad volume\n");
            goto out;
        }

        ret = csd_client_volume(volume);

    } else if (strncmp(command, "mic-mute", 8) == 0) {
        int state;

        if (sscanf(command, "%*s %d", &state) != 1 || (state != 0 && state != 1)) {
            ERR("Bad volume\n");
            goto out;
        }

        ret = csd_client_mic_mute(state);

    } else if (strcmp(command, "start-voice") == 0) {
        if (state.rx_dev != -1 && state.tx_dev != -1)
            ret = csd_client_start_voice();
        else {
            DBG("Deferring start voice till devices are enabled\n");
            state.start_voice = 1;
            ret = 0;
        }

    } else if (strcmp(command, "stop-voice") == 0) {
        ret = csd_client_stop_voice();

        /* Reset all the things */
        state.start_voice = 0;
        state.disable_device = 0;
        state.rx_dev = state.tx_dev = -1;

    } else {
        ERR("Bad command: %s\n", command);
    }

    if (ret < 0)
        ERR("Error running command\n");

    /* For now, there are no fatal errors */

out:
    return 0;
}

int main(int argc, char **argv)
{
    char command[COMMAND_MAX];
    int fd, done = 0, ret = 0;
    unsigned int i;

    if (argc > 1) {
        ERR("Bad arguments\n");
        return -1;
    }

    if (init_lib() < 0)
        return -1;

    if (init_daemon() < 0)
        return -1;

    if ((ret = acdb_loader_init_ACDB()) < 0) {
        ERR("Could not initialise acdb loader\n");
        return ret;
    }

    if ((ret = csd_client_init()) < 0) {
        ERR("Could not initialise csd client\n");
        return ret;
    }

    while (!done) {
        fd = accept(state.sockfd, NULL, NULL);
        if (fd < 0) {
            ERR("Could not accept incoming connection\n");
            continue;
        }

        /* We now read one "command" which is a string terminated with a NULL */
        for (i = 0; i < sizeof(command); i++) {
            if (read(fd, &command[i], 1) != 1) {
                ERR("Error reading command. Ignoring.\n");
                goto next;
            }

            if (command[i] == '\0') {
                DBG("Got command: %s\n", command);
                break;
            }
        }

        if (strcmp(command, "quit") == 0) {
            DBG("Got quit message. Exiting.\n");
            done = 1;
        } else if (process(command) < 0) {
            ERR("Fatal error while processing commands. Exiting.\n");
            ret = -1;
            done = 1;
        }

        /* Send back return code */
        if (write(fd, &ret, 4) < 4)
            ERR("Error sending return code");

next:
        close(fd);
    }

    close(state.sockfd);

out:
    csd_client_deinit();
    acdb_loader_deallocate_ACDB();

    return ret;
}