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gecko-dev/hal/gonk/GonkFMRadio.cpp

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/* Copyright 2012 Mozilla Foundation and Mozilla contributors
*
* 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.
*/
#include "Hal.h"
#include "HalLog.h"
#include "tavarua.h"
#include "nsThreadUtils.h"
#include "mozilla/FileUtils.h"
#include <cutils/properties.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/videodev2.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/epoll.h>
#include <sys/stat.h>
#include <sys/types.h>
/* Bionic might not have the newer version of the v4l2 headers that
* define these controls, so we define them here if they're not found.
*/
#ifndef V4L2_CTRL_CLASS_FM_RX
#define V4L2_CTRL_CLASS_FM_RX 0x00a10000
#define V4L2_CID_FM_RX_CLASS_BASE (V4L2_CTRL_CLASS_FM_RX | 0x900)
#define V4L2_CID_TUNE_DEEMPHASIS (V4L2_CID_FM_RX_CLASS_BASE + 1)
#define V4L2_DEEMPHASIS_DISABLED 0
#define V4L2_DEEMPHASIS_50_uS 1
#define V4L2_DEEMPHASIS_75_uS 2
#define V4L2_CID_RDS_RECEPTION (V4L2_CID_FM_RX_CLASS_BASE + 2)
#endif
#ifndef V4L2_RDS_BLOCK_MSK
struct v4l2_rds_data {
uint8_t lsb;
uint8_t msb;
uint8_t block;
} __attribute__ ((packed));
#define V4L2_RDS_BLOCK_MSK 0x7
#define V4L2_RDS_BLOCK_A 0
#define V4L2_RDS_BLOCK_B 1
#define V4L2_RDS_BLOCK_C 2
#define V4L2_RDS_BLOCK_D 3
#define V4L2_RDS_BLOCK_C_ALT 4
#define V4L2_RDS_BLOCK_INVALID 7
#define V4L2_RDS_BLOCK_CORRECTED 0x40
#define V4L2_RDS_BLOCK_ERROR 0x80
#endif
namespace mozilla {
namespace hal_impl {
uint32_t GetFMRadioFrequency();
static int sRadioFD;
static bool sRadioEnabled;
static bool sRDSEnabled;
static pthread_t sRadioThread;
static pthread_t sRDSThread;
static hal::FMRadioSettings sRadioSettings;
static int sMsmFMVersion;
static bool sMsmFMMode;
static bool sRDSSupported;
static int
setControl(uint32_t id, int32_t value)
{
struct v4l2_control control = {0};
control.id = id;
control.value = value;
return ioctl(sRadioFD, VIDIOC_S_CTRL, &control);
}
class RadioUpdate : public nsRunnable {
hal::FMRadioOperation mOp;
hal::FMRadioOperationStatus mStatus;
public:
RadioUpdate(hal::FMRadioOperation op, hal::FMRadioOperationStatus status)
: mOp(op)
, mStatus(status)
{}
NS_IMETHOD Run() {
hal::FMRadioOperationInformation info;
info.operation() = mOp;
info.status() = mStatus;
info.frequency() = GetFMRadioFrequency();
hal::NotifyFMRadioStatus(info);
return NS_OK;
}
};
/* Runs on the radio thread */
static void
initMsmFMRadio(hal::FMRadioSettings &aInfo)
{
mozilla::ScopedClose fd(sRadioFD);
char version[64];
int rc;
snprintf(version, sizeof(version), "%d", sMsmFMVersion);
property_set("hw.fm.version", version);
/* Set the mode for soc downloader */
property_set("hw.fm.mode", "normal");
/* start fm_dl service */
property_set("ctl.start", "fm_dl");
/*
* Fix bug 800263. Wait until the FM radio chips initialization is done
* then set other properties, or the system will hang and reboot. This
* work around is from codeaurora
* (git://codeaurora.org/platform/frameworks/base.git).
*/
for (int i = 0; i < 4; ++i) {
sleep(1);
char value[PROPERTY_VALUE_MAX];
property_get("hw.fm.init", value, "0");
if (!strcmp(value, "1")) {
break;
}
}
rc = setControl(V4L2_CID_PRIVATE_TAVARUA_STATE, FM_RECV);
if (rc < 0) {
HAL_LOG("Unable to turn on radio |%s|", strerror(errno));
return;
}
int preEmphasis = aInfo.preEmphasis() <= 50;
rc = setControl(V4L2_CID_PRIVATE_TAVARUA_EMPHASIS, preEmphasis);
if (rc) {
HAL_LOG("Unable to configure preemphasis");
return;
}
rc = setControl(V4L2_CID_PRIVATE_TAVARUA_RDS_STD, 0);
if (rc) {
HAL_LOG("Unable to configure RDS");
return;
}
int spacing;
switch (aInfo.spaceType()) {
case 50:
spacing = FM_CH_SPACE_50KHZ;
break;
case 100:
spacing = FM_CH_SPACE_100KHZ;
break;
case 200:
spacing = FM_CH_SPACE_200KHZ;
break;
default:
HAL_LOG("Unsupported space value - %d", aInfo.spaceType());
return;
}
rc = setControl(V4L2_CID_PRIVATE_TAVARUA_SPACING, spacing);
if (rc) {
HAL_LOG("Unable to configure spacing");
return;
}
/*
* Frequency conversions
*
* HAL uses units of 1k for frequencies
* V4L2 uses units of 62.5kHz
* Multiplying by (10000 / 625) converts from HAL units to V4L2.
*/
struct v4l2_tuner tuner = {0};
tuner.rangelow = (aInfo.lowerLimit() * 10000) / 625;
tuner.rangehigh = (aInfo.upperLimit() * 10000) / 625;
tuner.audmode = V4L2_TUNER_MODE_STEREO;
rc = ioctl(fd, VIDIOC_S_TUNER, &tuner);
if (rc < 0) {
HAL_LOG("Unable to adjust band limits");
return;
}
rc = setControl(V4L2_CID_PRIVATE_TAVARUA_REGION, TAVARUA_REGION_OTHER);
if (rc < 0) {
HAL_LOG("Unable to configure region");
return;
}
// Some devices do not support analog audio routing. This should be
// indicated by the 'ro.moz.fm.noAnalog' property at build time.
char propval[PROPERTY_VALUE_MAX];
property_get("ro.moz.fm.noAnalog", propval, "");
bool noAnalog = !strcmp(propval, "true");
rc = setControl(V4L2_CID_PRIVATE_TAVARUA_SET_AUDIO_PATH,
noAnalog ? FM_DIGITAL_PATH : FM_ANALOG_PATH);
if (rc < 0) {
HAL_LOG("Unable to set audio path");
return;
}
if (!noAnalog) {
/* Set the mode for soc downloader */
property_set("hw.fm.mode", "config_dac");
/* Use analog mode FM */
property_set("hw.fm.isAnalog", "true");
/* start fm_dl service */
property_set("ctl.start", "fm_dl");
for (int i = 0; i < 4; ++i) {
sleep(1);
char value[PROPERTY_VALUE_MAX];
property_get("hw.fm.init", value, "0");
if (!strcmp(value, "1")) {
break;
}
}
}
fd.forget();
sRadioEnabled = true;
}
/* Runs on the radio thread */
static void *
runMsmFMRadio(void *)
{
initMsmFMRadio(sRadioSettings);
if (!sRadioEnabled) {
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_ENABLE,
hal::FM_RADIO_OPERATION_STATUS_FAIL));
return nullptr;
}
uint8_t buf[128];
struct v4l2_buffer buffer = {0};
buffer.index = 1;
buffer.type = V4L2_BUF_TYPE_PRIVATE;
buffer.length = sizeof(buf);
buffer.m.userptr = (long unsigned int)buf;
while (sRadioEnabled) {
if (ioctl(sRadioFD, VIDIOC_DQBUF, &buffer) < 0) {
if (errno == EINTR)
continue;
break;
}
/* The tavarua driver reports a number of things asynchronously.
* In those cases, the status update comes from this thread. */
for (unsigned int i = 0; i < buffer.bytesused; i++) {
switch (buf[i]) {
case TAVARUA_EVT_RADIO_READY:
// The driver sends RADIO_READY both when we turn the radio on and when we turn
// the radio off.
if (sRadioEnabled) {
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_ENABLE,
hal::FM_RADIO_OPERATION_STATUS_SUCCESS));
}
break;
case TAVARUA_EVT_SEEK_COMPLETE:
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_SEEK,
hal::FM_RADIO_OPERATION_STATUS_SUCCESS));
break;
case TAVARUA_EVT_TUNE_SUCC:
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_TUNE,
hal::FM_RADIO_OPERATION_STATUS_SUCCESS));
break;
default:
break;
}
}
}
return nullptr;
}
/* This runs on the main thread but most of the
* initialization is pushed to the radio thread. */
void
EnableFMRadio(const hal::FMRadioSettings& aInfo)
{
if (sRadioEnabled) {
HAL_LOG("Radio already enabled!");
return;
}
hal::FMRadioOperationInformation info;
info.operation() = hal::FM_RADIO_OPERATION_ENABLE;
info.status() = hal::FM_RADIO_OPERATION_STATUS_FAIL;
mozilla::ScopedClose fd(open("/dev/radio0", O_RDWR));
if (fd < 0) {
HAL_LOG("Unable to open radio device");
hal::NotifyFMRadioStatus(info);
return;
}
struct v4l2_capability cap = {{0}};
int rc = ioctl(fd, VIDIOC_QUERYCAP, &cap);
if (rc < 0) {
HAL_LOG("Unable to query radio device");
hal::NotifyFMRadioStatus(info);
return;
}
sMsmFMMode = !strcmp((char *)cap.driver, "radio-tavarua") ||
!strcmp((char *)cap.driver, "radio-iris");
HAL_LOG("Radio: %s (%s)\n", cap.driver, cap.card);
if (!(cap.capabilities & V4L2_CAP_RADIO)) {
HAL_LOG("/dev/radio0 isn't a radio");
hal::NotifyFMRadioStatus(info);
return;
}
if (!(cap.capabilities & V4L2_CAP_TUNER)) {
HAL_LOG("/dev/radio0 doesn't support the tuner interface");
hal::NotifyFMRadioStatus(info);
return;
}
sRDSSupported = cap.capabilities & V4L2_CAP_RDS_CAPTURE;
sRadioSettings = aInfo;
if (sMsmFMMode) {
sRadioFD = fd.forget();
sMsmFMVersion = cap.version;
if (pthread_create(&sRadioThread, nullptr, runMsmFMRadio, nullptr)) {
HAL_LOG("Couldn't create radio thread");
hal::NotifyFMRadioStatus(info);
}
return;
}
struct v4l2_tuner tuner = {0};
tuner.type = V4L2_TUNER_RADIO;
tuner.rangelow = (aInfo.lowerLimit() * 10000) / 625;
tuner.rangehigh = (aInfo.upperLimit() * 10000) / 625;
tuner.audmode = V4L2_TUNER_MODE_STEREO;
rc = ioctl(fd, VIDIOC_S_TUNER, &tuner);
if (rc < 0) {
HAL_LOG("Unable to adjust band limits");
}
int emphasis;
switch (aInfo.preEmphasis()) {
case 0:
emphasis = V4L2_DEEMPHASIS_DISABLED;
break;
case 50:
emphasis = V4L2_DEEMPHASIS_50_uS;
break;
case 75:
emphasis = V4L2_DEEMPHASIS_75_uS;
break;
default:
MOZ_CRASH("Invalid preemphasis setting");
break;
}
rc = setControl(V4L2_CID_TUNE_DEEMPHASIS, emphasis);
if (rc < 0) {
HAL_LOG("Unable to configure deemphasis");
}
sRadioFD = fd.forget();
sRadioEnabled = true;
info.status() = hal::FM_RADIO_OPERATION_STATUS_SUCCESS;
hal::NotifyFMRadioStatus(info);
}
void
DisableFMRadio()
{
if (!sRadioEnabled)
return;
if (sRDSEnabled)
hal::DisableRDS();
sRadioEnabled = false;
if (sMsmFMMode) {
int rc = setControl(V4L2_CID_PRIVATE_TAVARUA_STATE, FM_OFF);
if (rc < 0) {
HAL_LOG("Unable to turn off radio");
}
pthread_join(sRadioThread, nullptr);
}
close(sRadioFD);
hal::FMRadioOperationInformation info;
info.operation() = hal::FM_RADIO_OPERATION_DISABLE;
info.status() = hal::FM_RADIO_OPERATION_STATUS_SUCCESS;
hal::NotifyFMRadioStatus(info);
}
void
FMRadioSeek(const hal::FMRadioSeekDirection& aDirection)
{
struct v4l2_hw_freq_seek seek = {0};
seek.type = V4L2_TUNER_RADIO;
seek.seek_upward = aDirection == hal::FMRadioSeekDirection::FM_RADIO_SEEK_DIRECTION_UP;
/* ICS and older don't have the spacing field */
#if ANDROID_VERSION == 15
seek.reserved[0] = sRadioSettings.spaceType() * 1000;
#else
seek.spacing = sRadioSettings.spaceType() * 1000;
#endif
int rc = ioctl(sRadioFD, VIDIOC_S_HW_FREQ_SEEK, &seek);
if (sMsmFMMode && rc >= 0)
return;
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_SEEK,
rc < 0 ?
hal::FM_RADIO_OPERATION_STATUS_FAIL :
hal::FM_RADIO_OPERATION_STATUS_SUCCESS));
if (rc < 0) {
HAL_LOG("Could not initiate hardware seek");
return;
}
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_TUNE,
hal::FM_RADIO_OPERATION_STATUS_SUCCESS));
}
void
GetFMRadioSettings(hal::FMRadioSettings* aInfo)
{
if (!sRadioEnabled) {
return;
}
struct v4l2_tuner tuner = {0};
int rc = ioctl(sRadioFD, VIDIOC_G_TUNER, &tuner);
if (rc < 0) {
HAL_LOG("Could not query fm radio for settings");
return;
}
aInfo->upperLimit() = (tuner.rangehigh * 625) / 10000;
aInfo->lowerLimit() = (tuner.rangelow * 625) / 10000;
}
void
SetFMRadioFrequency(const uint32_t frequency)
{
struct v4l2_frequency freq = {0};
freq.type = V4L2_TUNER_RADIO;
freq.frequency = (frequency * 10000) / 625;
int rc = ioctl(sRadioFD, VIDIOC_S_FREQUENCY, &freq);
if (rc < 0)
HAL_LOG("Could not set radio frequency");
if (sMsmFMMode && rc >= 0)
return;
NS_DispatchToMainThread(new RadioUpdate(hal::FM_RADIO_OPERATION_TUNE,
rc < 0 ?
hal::FM_RADIO_OPERATION_STATUS_FAIL :
hal::FM_RADIO_OPERATION_STATUS_SUCCESS));
}
uint32_t
GetFMRadioFrequency()
{
if (!sRadioEnabled)
return 0;
struct v4l2_frequency freq = {0};
int rc = ioctl(sRadioFD, VIDIOC_G_FREQUENCY, &freq);
if (rc < 0) {
HAL_LOG("Could not get radio frequency");
return 0;
}
return (freq.frequency * 625) / 10000;
}
bool
IsFMRadioOn()
{
return sRadioEnabled;
}
uint32_t
GetFMRadioSignalStrength()
{
struct v4l2_tuner tuner = {0};
int rc = ioctl(sRadioFD, VIDIOC_G_TUNER, &tuner);
if (rc < 0) {
HAL_LOG("Could not query fm radio for signal strength");
return 0;
}
return tuner.signal;
}
void
CancelFMRadioSeek()
{}
/* Runs on the rds thread */
static void*
readRDSDataThread(void* data)
{
v4l2_rds_data rdsblocks[16];
uint16_t blocks[4];
ScopedClose pipefd((int)data);
ScopedClose epollfd(epoll_create(2));
if (epollfd < 0) {
HAL_LOG("Could not create epoll FD for RDS thread (%d)", errno);
return nullptr;
}
epoll_event event = {
EPOLLIN,
{ 0 }
};
event.data.fd = pipefd;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, pipefd, &event) < 0) {
HAL_LOG("Could not set up epoll FD for RDS thread (%d)", errno);
return nullptr;
}
event.data.fd = sRadioFD;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, sRadioFD, &event) < 0) {
HAL_LOG("Could not set up epoll FD for RDS thread (%d)", errno);
return nullptr;
}
epoll_event events[2] = {{ 0 }};
int event_count;
uint32_t block_bitmap = 0;
while ((event_count = epoll_wait(epollfd, events, 2, -1)) > 0 ||
errno == EINTR) {
bool RDSDataAvailable = false;
for (int i = 0; i < event_count; i++) {
if (events[i].data.fd == pipefd) {
if (!sRDSEnabled)
return nullptr;
char tmp[32];
TEMP_FAILURE_RETRY(read(pipefd, tmp, sizeof(tmp)));
} else if (events[i].data.fd == sRadioFD) {
RDSDataAvailable = true;
}
}
if (!RDSDataAvailable)
continue;
ssize_t len =
TEMP_FAILURE_RETRY(read(sRadioFD, rdsblocks, sizeof(rdsblocks)));
if (len < 0) {
HAL_LOG("Unexpected error while reading RDS data %d", errno);
return nullptr;
}
int blockcount = len / sizeof(rdsblocks[0]);
for (int i = 0; i < blockcount; i++) {
if ((rdsblocks[i].block & V4L2_RDS_BLOCK_MSK) == V4L2_RDS_BLOCK_INVALID ||
rdsblocks[i].block & V4L2_RDS_BLOCK_ERROR) {
block_bitmap |= 1 << V4L2_RDS_BLOCK_INVALID;
continue;
}
int blocknum = rdsblocks[i].block & V4L2_RDS_BLOCK_MSK;
// In some cases, the full set of bits in an RDS group isn't
// needed, in which case version B RDS groups can be sent.
// Version B groups replace block C with block C' (V4L2_RDS_BLOCK_C_ALT).
// Block C' always stores the PI code, so receivers can find the PI
// code more quickly/reliably.
// However, we only process whole RDS groups, so it doesn't matter here.
if (blocknum == V4L2_RDS_BLOCK_C_ALT)
blocknum = V4L2_RDS_BLOCK_C;
if (blocknum > V4L2_RDS_BLOCK_D) {
HAL_LOG("Unexpected RDS block number %d. This is a driver bug.",
blocknum);
continue;
}
if (blocknum == V4L2_RDS_BLOCK_A)
block_bitmap = 0;
// Skip the group if we skipped a block.
// This stops us from processing blocks sent out of order.
if (block_bitmap != ((1u << blocknum) - 1u)) {
block_bitmap |= 1 << V4L2_RDS_BLOCK_INVALID;
continue;
}
block_bitmap |= 1 << blocknum;
blocks[blocknum] = (rdsblocks[i].msb << 8) | rdsblocks[i].lsb;
// Make sure we have all 4 blocks and that they're valid
if (block_bitmap != 0x0F)
continue;
hal::FMRadioRDSGroup group;
group.blockA() = blocks[V4L2_RDS_BLOCK_A];
group.blockB() = blocks[V4L2_RDS_BLOCK_B];
group.blockC() = blocks[V4L2_RDS_BLOCK_C];
group.blockD() = blocks[V4L2_RDS_BLOCK_D];
NotifyFMRadioRDSGroup(group);
}
}
return nullptr;
}
static int sRDSPipeFD;
bool
EnableRDS(uint32_t aMask)
{
if (!sRadioEnabled || !sRDSSupported)
return false;
if (sMsmFMMode)
setControl(V4L2_CID_PRIVATE_TAVARUA_RDSGROUP_MASK, aMask);
if (sRDSEnabled)
return true;
int pipefd[2];
int rc = pipe2(pipefd, O_NONBLOCK);
if (rc < 0) {
HAL_LOG("Could not create RDS thread signaling pipes (%d)", rc);
return false;
}
ScopedClose writefd(pipefd[1]);
ScopedClose readfd(pipefd[0]);
rc = setControl(V4L2_CID_RDS_RECEPTION, true);
if (rc < 0) {
HAL_LOG("Could not enable RDS reception (%d)", rc);
return false;
}
sRDSPipeFD = writefd;
sRDSEnabled = true;
rc = pthread_create(&sRDSThread, nullptr,
readRDSDataThread, (void*)pipefd[0]);
if (rc) {
HAL_LOG("Could not start RDS reception thread (%d)", rc);
setControl(V4L2_CID_RDS_RECEPTION, false);
sRDSEnabled = false;
return false;
}
readfd.forget();
writefd.forget();
return true;
}
void
DisableRDS()
{
if (!sRadioEnabled || !sRDSEnabled)
return;
int rc = setControl(V4L2_CID_RDS_RECEPTION, false);
if (rc < 0) {
HAL_LOG("Could not disable RDS reception (%d)", rc);
}
sRDSEnabled = false;
write(sRDSPipeFD, "x", 1);
pthread_join(sRDSThread, nullptr);
close(sRDSPipeFD);
}
} // hal_impl
} // namespace mozilla
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