blob: 5e9bd5bb5056f0fbec190533bb6df3fba7e64f5c [file] [log] [blame]
/*
* Copyright (C) 2012 The Android Open Source Project
* Inspired by TinyHW, written by Mark Brown at Wolfson Micro
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "audio_hw_primary"
/*#define LOG_NDEBUG 0*/
#include <errno.h>
#include <expat.h>
#include <stdbool.h>
#include <stdio.h>
#include <cutils/log.h>
#include <cutils/properties.h>
#include <tinyalsa/asoundlib.h>
#define BUF_SIZE 1024
#define MIXER_XML_PATH "/system/etc/mixer_paths.xml"
#define INITIAL_MIXER_PATH_SIZE 8
#define MIXER_CARD 0
struct mixer_state {
struct mixer_ctl *ctl;
int old_value;
int new_value;
int reset_value;
};
struct mixer_setting {
struct mixer_ctl *ctl;
int value;
};
struct mixer_path {
char *name;
unsigned int size;
unsigned int length;
struct mixer_setting *setting;
};
struct audio_route {
struct mixer *mixer;
unsigned int num_mixer_ctls;
struct mixer_state *mixer_state;
unsigned int mixer_path_size;
unsigned int num_mixer_paths;
struct mixer_path *mixer_path;
};
struct config_parse_state {
struct audio_route *ar;
struct mixer_path *path;
int level;
};
/* path functions */
static void path_free(struct audio_route *ar)
{
unsigned int i;
for (i = 0; i < ar->num_mixer_paths; i++) {
if (ar->mixer_path[i].name)
free(ar->mixer_path[i].name);
if (ar->mixer_path[i].setting)
free(ar->mixer_path[i].setting);
}
free(ar->mixer_path);
}
static struct mixer_path *path_get_by_name(struct audio_route *ar,
const char *name)
{
unsigned int i;
for (i = 0; i < ar->num_mixer_paths; i++)
if (strcmp(ar->mixer_path[i].name, name) == 0)
return &ar->mixer_path[i];
return NULL;
}
static struct mixer_path *path_create(struct audio_route *ar, const char *name)
{
struct mixer_path *new_mixer_path = NULL;
if (path_get_by_name(ar, name)) {
ALOGE("Path name '%s' already exists", name);
return NULL;
}
/* check if we need to allocate more space for mixer paths */
if (ar->mixer_path_size <= ar->num_mixer_paths) {
if (ar->mixer_path_size == 0)
ar->mixer_path_size = INITIAL_MIXER_PATH_SIZE;
else
ar->mixer_path_size *= 2;
new_mixer_path = realloc(ar->mixer_path, ar->mixer_path_size *
sizeof(struct mixer_path));
if (new_mixer_path == NULL) {
ALOGE("Unable to allocate more paths");
return NULL;
} else {
ar->mixer_path = new_mixer_path;
}
}
/* initialise the new mixer path */
ar->mixer_path[ar->num_mixer_paths].name = strdup(name);
ar->mixer_path[ar->num_mixer_paths].size = 0;
ar->mixer_path[ar->num_mixer_paths].length = 0;
ar->mixer_path[ar->num_mixer_paths].setting = NULL;
/* return the mixer path just added, then increment number of them */
return &ar->mixer_path[ar->num_mixer_paths++];
}
static bool path_setting_exists(struct mixer_path *path,
struct mixer_setting *setting)
{
unsigned int i;
for (i = 0; i < path->length; i++)
if (path->setting[i].ctl == setting->ctl)
return true;
return false;
}
static int path_add_setting(struct mixer_path *path,
struct mixer_setting *setting)
{
struct mixer_setting *new_path_setting;
if (path_setting_exists(path, setting)) {
ALOGE("Duplicate path setting '%s'",
mixer_ctl_get_name(setting->ctl));
return -1;
}
/* check if we need to allocate more space for path settings */
if (path->size <= path->length) {
if (path->size == 0)
path->size = INITIAL_MIXER_PATH_SIZE;
else
path->size *= 2;
new_path_setting = realloc(path->setting,
path->size * sizeof(struct mixer_setting));
if (new_path_setting == NULL) {
ALOGE("Unable to allocate more path settings");
return -1;
} else {
path->setting = new_path_setting;
}
}
/* initialise the new path setting */
path->setting[path->length].ctl = setting->ctl;
path->setting[path->length].value = setting->value;
path->length++;
return 0;
}
static int path_add_path(struct mixer_path *path, struct mixer_path *sub_path)
{
unsigned int i;
for (i = 0; i < sub_path->length; i++)
if (path_add_setting(path, &sub_path->setting[i]) < 0)
return -1;
return 0;
}
static void path_print(struct mixer_path *path)
{
unsigned int i;
ALOGV("Path: %s, length: %d", path->name, path->length);
for (i = 0; i < path->length; i++)
ALOGV(" %d: %s -> %d", i, mixer_ctl_get_name(path->setting[i].ctl),
path->setting[i].value);
}
static int path_apply(struct audio_route *ar, struct mixer_path *path)
{
unsigned int i;
unsigned int j;
for (i = 0; i < path->length; i++) {
struct mixer_ctl *ctl = path->setting[i].ctl;
/* locate the mixer ctl in the list */
for (j = 0; j < ar->num_mixer_ctls; j++) {
if (ar->mixer_state[j].ctl == ctl)
break;
}
/* apply the new value */
ar->mixer_state[j].new_value = path->setting[i].value;
}
return 0;
}
/* mixer helper function */
static int mixer_enum_string_to_value(struct mixer_ctl *ctl, const char *string)
{
unsigned int i;
/* Search the enum strings for a particular one */
for (i = 0; i < mixer_ctl_get_num_enums(ctl); i++) {
if (strcmp(mixer_ctl_get_enum_string(ctl, i), string) == 0)
break;
}
return i;
}
static void start_tag(void *data, const XML_Char *tag_name,
const XML_Char **attr)
{
const XML_Char *attr_name = NULL;
const XML_Char *attr_value = NULL;
struct config_parse_state *state = data;
struct audio_route *ar = state->ar;
unsigned int i;
struct mixer_ctl *ctl;
int value;
struct mixer_setting mixer_setting;
/* Get name, type and value attributes (these may be empty) */
for (i = 0; attr[i]; i += 2) {
if (strcmp(attr[i], "name") == 0)
attr_name = attr[i + 1];
else if (strcmp(attr[i], "value") == 0)
attr_value = attr[i + 1];
}
/* Look at tags */
if (strcmp(tag_name, "path") == 0) {
if (attr_name == NULL) {
ALOGE("Unnamed path!");
} else {
if (state->level == 1) {
/* top level path: create and stash the path */
state->path = path_create(ar, (char *)attr_name);
} else {
/* nested path */
struct mixer_path *sub_path = path_get_by_name(ar, attr_name);
path_add_path(state->path, sub_path);
}
}
}
else if (strcmp(tag_name, "ctl") == 0) {
/* Obtain the mixer ctl and value */
ctl = mixer_get_ctl_by_name(ar->mixer, attr_name);
switch (mixer_ctl_get_type(ctl)) {
case MIXER_CTL_TYPE_BOOL:
case MIXER_CTL_TYPE_INT:
value = atoi((char *)attr_value);
break;
case MIXER_CTL_TYPE_ENUM:
value = mixer_enum_string_to_value(ctl, (char *)attr_value);
break;
default:
value = 0;
break;
}
if (state->level == 1) {
/* top level ctl (initial setting) */
/* locate the mixer ctl in the list */
for (i = 0; i < ar->num_mixer_ctls; i++) {
if (ar->mixer_state[i].ctl == ctl)
break;
}
/* apply the new value */
ar->mixer_state[i].new_value = value;
} else {
/* nested ctl (within a path) */
mixer_setting.ctl = ctl;
mixer_setting.value = value;
path_add_setting(state->path, &mixer_setting);
}
}
state->level++;
}
static void end_tag(void *data, const XML_Char *tag_name)
{
struct config_parse_state *state = data;
state->level--;
}
static int alloc_mixer_state(struct audio_route *ar)
{
unsigned int i;
ar->num_mixer_ctls = mixer_get_num_ctls(ar->mixer);
ar->mixer_state = malloc(ar->num_mixer_ctls * sizeof(struct mixer_state));
if (!ar->mixer_state)
return -1;
for (i = 0; i < ar->num_mixer_ctls; i++) {
ar->mixer_state[i].ctl = mixer_get_ctl(ar->mixer, i);
/* only get value 0, assume multiple ctl values are the same */
ar->mixer_state[i].old_value = mixer_ctl_get_value(ar->mixer_state[i].ctl, 0);
ar->mixer_state[i].new_value = ar->mixer_state[i].old_value;
}
return 0;
}
static void free_mixer_state(struct audio_route *ar)
{
free(ar->mixer_state);
ar->mixer_state = NULL;
}
void update_mixer_state(struct audio_route *ar)
{
unsigned int i;
unsigned int j;
for (i = 0; i < ar->num_mixer_ctls; i++) {
/* if the value has changed, update the mixer */
if (ar->mixer_state[i].old_value != ar->mixer_state[i].new_value) {
/* set all ctl values the same */
for (j = 0; j < mixer_ctl_get_num_values(ar->mixer_state[i].ctl); j++)
mixer_ctl_set_value(ar->mixer_state[i].ctl, j,
ar->mixer_state[i].new_value);
ar->mixer_state[i].old_value = ar->mixer_state[i].new_value;
}
}
}
/* saves the current state of the mixer, for resetting all controls */
static void save_mixer_state(struct audio_route *ar)
{
unsigned int i;
for (i = 0; i < ar->num_mixer_ctls; i++) {
/* only get value 0, assume multiple ctl values are the same */
ar->mixer_state[i].reset_value = mixer_ctl_get_value(ar->mixer_state[i].ctl, 0);
}
}
/* this resets all mixer settings to the saved values */
void reset_mixer_state(struct audio_route *ar)
{
unsigned int i;
/* load all of the saved values */
for (i = 0; i < ar->num_mixer_ctls; i++)
ar->mixer_state[i].new_value = ar->mixer_state[i].reset_value;
}
void audio_route_apply_path(struct audio_route *ar, const char *name)
{
struct mixer_path *path;
if (!ar) {
ALOGE("invalid audio_route");
return;
}
path = path_get_by_name(ar, name);
if (!path) {
ALOGE("unable to find path '%s'", name);
return;
}
path_apply(ar, path);
}
struct audio_route *audio_route_init(void)
{
struct config_parse_state state;
XML_Parser parser;
FILE *file;
int bytes_read;
void *buf;
int i;
struct mixer_path *path;
struct audio_route *ar;
/* TODO remove when lunchbox is deprecated */
char property[PROPERTY_VALUE_MAX];
int hw_revision;
property_get("ro.revision", property, "1");
hw_revision = atoi(property);
ar = calloc(1, sizeof(struct audio_route));
if (!ar)
goto err_calloc;
ar->mixer = mixer_open(MIXER_CARD);
if (!ar->mixer) {
ALOGE("Unable to open the mixer, aborting.");
goto err_mixer_open;
}
ar->mixer_path = NULL;
ar->mixer_path_size = 0;
ar->num_mixer_paths = 0;
/* allocate space for and read current mixer settings */
if (alloc_mixer_state(ar) < 0)
goto err_mixer_state;
/* TODO remove when lunchbox is deprecated */
if (hw_revision == 1)
file = fopen("/system/etc/mixer_paths_lb.xml", "r");
else
file = fopen(MIXER_XML_PATH, "r");
if (!file) {
ALOGE("Failed to open %s", MIXER_XML_PATH);
goto err_fopen;
}
parser = XML_ParserCreate(NULL);
if (!parser) {
ALOGE("Failed to create XML parser");
goto err_parser_create;
}
memset(&state, 0, sizeof(state));
state.ar = ar;
XML_SetUserData(parser, &state);
XML_SetElementHandler(parser, start_tag, end_tag);
for (;;) {
buf = XML_GetBuffer(parser, BUF_SIZE);
if (buf == NULL)
goto err_parse;
bytes_read = fread(buf, 1, BUF_SIZE, file);
if (bytes_read < 0)
goto err_parse;
if (XML_ParseBuffer(parser, bytes_read,
bytes_read == 0) == XML_STATUS_ERROR) {
ALOGE("Error in mixer xml (%s)", MIXER_XML_PATH);
goto err_parse;
}
if (bytes_read == 0)
break;
}
/* apply the initial mixer values, and save them so we can reset the
mixer to the original values */
update_mixer_state(ar);
save_mixer_state(ar);
XML_ParserFree(parser);
fclose(file);
return ar;
err_parse:
XML_ParserFree(parser);
err_parser_create:
fclose(file);
err_fopen:
free_mixer_state(ar);
err_mixer_state:
mixer_close(ar->mixer);
err_mixer_open:
free(ar);
ar = NULL;
err_calloc:
return NULL;
}
void audio_route_free(struct audio_route *ar)
{
free_mixer_state(ar);
mixer_close(ar->mixer);
free(ar);
}