From 89577c08b573b6e0d0474da70483aa7b8faea4b9 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sun, 6 Sep 2009 10:48:52 -0300 Subject: dvb-spec: Start a DocBook XML 4.1.2 version of DVB API docs From: Mauro Carvalho Chehab This is an unfinished work. It is a port of DVB API verison 3 from LaTex into DocBook. Currently, only chapters 1 and 2 were converted. Still pending the conversion of the remaining chapters and a good style revision after the end of the conversion. Priority: normal Signed-off-by: Mauro Carvalho Chehab --- dvb-spec/sgml/frontend.sgml | 1816 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1816 insertions(+) create mode 100644 dvb-spec/sgml/frontend.sgml (limited to 'dvb-spec/sgml/frontend.sgml') diff --git a/dvb-spec/sgml/frontend.sgml b/dvb-spec/sgml/frontend.sgml new file mode 100644 index 000000000..d2a6ece04 --- /dev/null +++ b/dvb-spec/sgml/frontend.sgml @@ -0,0 +1,1816 @@ +DVB Frontend API + +The DVB frontend device controls the tuner and DVB demodulator +hardware. It can be accessed through /dev/dvb/adapter0/frontend0. Data types and and +ioctl definitions can be accessed by including linux/dvb/frontend.h in your application. + +DVB frontends come in three varieties: DVB-S (satellite), DVB-C +(cable) and DVB-T (terrestrial). Transmission via the internet (DVB-IP) +is not yet handled by this API but a future extension is possible. For +DVB-S the frontend device also supports satellite equipment control +(SEC) via DiSEqC and V-SEC protocols. The DiSEqC (digital SEC) +specification is available from Eutelsat http://www.eutelsat.org/. + +Note that the DVB API may also be used for MPEG decoder-only PCI +cards, in which case there exists no frontend device. + +
+Frontend Data Types + +
+frontend type + +For historical reasons frontend types are named after the type of modulation used in +transmission. + + typedef enum fe_type { + FE_QPSK, /⋆ DVB-S ⋆/ + FE_QAM, /⋆ DVB-C ⋆/ + FE_OFDM /⋆ DVB-T ⋆/ + } fe_type_t; + + +
+ +
+frontend capabilities + +Capabilities describe what a frontend can do. Some capabilities can only be supported for +a specific frontend type. + + typedef enum fe_caps { + FE_IS_STUPID = 0, + FE_CAN_INVERSION_AUTO = 0x1, + FE_CAN_FEC_1_2 = 0x2, + FE_CAN_FEC_2_3 = 0x4, + FE_CAN_FEC_3_4 = 0x8, + FE_CAN_FEC_4_5 = 0x10, + FE_CAN_FEC_5_6 = 0x20, + FE_CAN_FEC_6_7 = 0x40, + FE_CAN_FEC_7_8 = 0x80, + FE_CAN_FEC_8_9 = 0x100, + FE_CAN_FEC_AUTO = 0x200, + FE_CAN_QPSK = 0x400, + FE_CAN_QAM_16 = 0x800, + FE_CAN_QAM_32 = 0x1000, + FE_CAN_QAM_64 = 0x2000, + FE_CAN_QAM_128 = 0x4000, + FE_CAN_QAM_256 = 0x8000, + FE_CAN_QAM_AUTO = 0x10000, + FE_CAN_TRANSMISSION_MODE_AUTO = 0x20000, + FE_CAN_BANDWIDTH_AUTO = 0x40000, + FE_CAN_GUARD_INTERVAL_AUTO = 0x80000, + FE_CAN_HIERARCHY_AUTO = 0x100000, + FE_CAN_MUTE_TS = 0x80000000, + FE_CAN_CLEAN_SETUP = 0x40000000 + } fe_caps_t; + +
+ +
+frontend information + +Information about the frontend ca be queried with FE_GET_INFO. + + + struct dvb_frontend_info { + char name[128]; + fe_type_t type; + uint32_t frequency_min; + uint32_t frequency_max; + uint32_t frequency_stepsize; + uint32_t frequency_tolerance; + uint32_t symbol_rate_min; + uint32_t symbol_rate_max; + uint32_t symbol_rate_tolerance; /⋆ ppm ⋆/ + uint32_t notifier_delay; /⋆ ms ⋆/ + fe_caps_t caps; + }; + +
+ +
+diseqc master command + +A message sent from the frontend to DiSEqC capable equipment. + + struct dvb_diseqc_master_cmd { + uint8_t msg [6]; /⋆ { framing, address, command, data[3] } ⋆/ + uint8_t msg_len; /⋆ valid values are 3...6 ⋆/ + }; + +
+
+diseqc slave reply + +A reply to the frontend from DiSEqC 2.0 capable equipment. + + struct dvb_diseqc_slave_reply { + uint8_t msg [4]; /⋆ { framing, data [3] } ⋆/ + uint8_t msg_len; /⋆ valid values are 0...4, 0 means no msg ⋆/ + int timeout; /⋆ return from ioctl after timeout ms with ⋆/ + }; /⋆ errorcode when no message was received ⋆/ + +
+ +
+diseqc slave reply +The voltage is usually used with non-DiSEqC capable LNBs to switch the polarzation +(horizontal/vertical). When using DiSEqC epuipment this voltage has to be switched +consistently to the DiSEqC commands as described in the DiSEqC spec. + + typedef enum fe_sec_voltage { + SEC_VOLTAGE_13, + SEC_VOLTAGE_18 + } fe_sec_voltage_t; + +
+ +
+SEC continuous tone + +The continous 22KHz tone is usually used with non-DiSEqC capable LNBs to switch the +high/low band of a dual-band LNB. When using DiSEqC epuipment this voltage has to +be switched consistently to the DiSEqC commands as described in the DiSEqC +spec. + + typedef enum fe_sec_tone_mode { + SEC_TONE_ON, + SEC_TONE_OFF + } fe_sec_tone_mode_t; + +
+ +
+SEC tone burst + +The 22KHz tone burst is usually used with non-DiSEqC capable switches to select +between two connected LNBs/satellites. When using DiSEqC epuipment this voltage has to +be switched consistently to the DiSEqC commands as described in the DiSEqC +spec. + + typedef enum fe_sec_mini_cmd { + SEC_MINI_A, + SEC_MINI_B + } fe_sec_mini_cmd_t; + + + +
+ +
+frontend status +Several functions of the frontend device use the fe_status data type defined +by + + typedef enum fe_status { + FE_HAS_SIGNAL = 0x01, /⋆ found something above the noise level ⋆/ + FE_HAS_CARRIER = 0x02, /⋆ found a DVB signal ⋆/ + FE_HAS_VITERBI = 0x04, /⋆ FEC is stable ⋆/ + FE_HAS_SYNC = 0x08, /⋆ found sync bytes ⋆/ + FE_HAS_LOCK = 0x10, /⋆ everything's working... ⋆/ + FE_TIMEDOUT = 0x20, /⋆ no lock within the last ~2 seconds ⋆/ + FE_REINIT = 0x40 /⋆ frontend was reinitialized, ⋆/ + } fe_status_t; /⋆ application is recommned to reset ⋆/ + +to indicate the current state and/or state changes of the frontend hardware. + + +
+ +
+frontend parameters +The kind of parameters passed to the frontend device for tuning depend on +the kind of hardware you are using. All kinds of parameters are combined as an +union in the FrontendParameters structure: + + struct dvb_frontend_parameters { + uint32_t frequency; /⋆ (absolute) frequency in Hz for QAM/OFDM ⋆/ + /⋆ intermediate frequency in kHz for QPSK ⋆/ + fe_spectral_inversion_t inversion; + union { + struct dvb_qpsk_parameters qpsk; + struct dvb_qam_parameters qam; + struct dvb_ofdm_parameters ofdm; + } u; + }; + +For satellite QPSK frontends you have to use the QPSKParameters member defined by + + struct dvb_qpsk_parameters { + uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/ + fe_code_rate_t fec_inner; /⋆ forward error correction (see above) ⋆/ + }; + +for cable QAM frontend you use the QAMParameters structure + + struct dvb_qam_parameters { + uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/ + fe_code_rate_t fec_inner; /⋆ forward error correction (see above) ⋆/ + fe_modulation_t modulation; /⋆ modulation type (see above) ⋆/ + }; + +DVB-T frontends are supported by the OFDMParamters structure + + + struct dvb_ofdm_parameters { + fe_bandwidth_t bandwidth; + fe_code_rate_t code_rate_HP; /⋆ high priority stream code rate ⋆/ + fe_code_rate_t code_rate_LP; /⋆ low priority stream code rate ⋆/ + fe_modulation_t constellation; /⋆ modulation type (see above) ⋆/ + fe_transmit_mode_t transmission_mode; + fe_guard_interval_t guard_interval; + fe_hierarchy_t hierarchy_information; + }; + +In the case of QPSK frontends the Frequency field specifies the intermediate +frequency, i.e. the offset which is effectively added to the local oscillator frequency (LOF) of +the LNB. The intermediate frequency has to be specified in units of kHz. For QAM and +OFDM frontends the Frequency specifies the absolute frequency and is given in +Hz. + +The Inversion field can take one of these values: + + + typedef enum fe_spectral_inversion { + INVERSION_OFF, + INVERSION_ON, + INVERSION_AUTO + } fe_spectral_inversion_t; + +It indicates if spectral inversion should be presumed or not. In the automatic setting +(INVERSION_AUTO) the hardware will try to figure out the correct setting by +itself. + +The possible values for the FEC_inner field are + + + typedef enum fe_code_rate { + FEC_NONE = 0, + FEC_1_2, + FEC_2_3, + FEC_3_4, + FEC_4_5, + FEC_5_6, + FEC_6_7, + FEC_7_8, + FEC_8_9, + FEC_AUTO + } fe_code_rate_t; + +which correspond to error correction rates of 1/2, 2/3, etc., no error correction or auto +detection. + +For cable and terrestrial frontends (QAM and OFDM) one also has to specify the quadrature +modulation mode which can be one of the following: + + + typedef enum fe_modulation { + QPSK, + QAM_16, + QAM_32, + QAM_64, + QAM_128, + QAM_256, + QAM_AUTO + } fe_modulation_t; + +Finally, there are several more parameters for OFDM: + + + typedef enum fe_transmit_mode { + TRANSMISSION_MODE_2K, + TRANSMISSION_MODE_8K, + TRANSMISSION_MODE_AUTO + } fe_transmit_mode_t; + + + typedef enum fe_bandwidth { + BANDWIDTH_8_MHZ, + BANDWIDTH_7_MHZ, + BANDWIDTH_6_MHZ, + BANDWIDTH_AUTO + } fe_bandwidth_t; + + + typedef enum fe_guard_interval { + GUARD_INTERVAL_1_32, + GUARD_INTERVAL_1_16, + GUARD_INTERVAL_1_8, + GUARD_INTERVAL_1_4, + GUARD_INTERVAL_AUTO + } fe_guard_interval_t; + + + typedef enum fe_hierarchy { + HIERARCHY_NONE, + HIERARCHY_1, + HIERARCHY_2, + HIERARCHY_4, + HIERARCHY_AUTO + } fe_hierarchy_t; + + +
+ +
+frontend events + + struct dvb_frontend_event { + fe_status_t status; + struct dvb_frontend_parameters parameters; + }; + +
+
+ + +
+Frontend Function Calls + +
+open() +DESCRIPTION + + +This system call opens a named frontend device (/dev/dvb/adapter0/frontend0) + for subsequent use. Usually the first thing to do after a successful open is to + find out the frontend type with FE_GET_INFO. +The device can be opened in read-only mode, which only allows monitoring of + device status and statistics, or read/write mode, which allows any kind of use + (e.g. performing tuning operations.) + +In a system with multiple front-ends, it is usually the case that multiple devices + cannot be open in read/write mode simultaneously. As long as a front-end + device is opened in read/write mode, other open() calls in read/write mode will + either fail or block, depending on whether non-blocking or blocking mode was + specified. A front-end device opened in blocking mode can later be put into + non-blocking mode (and vice versa) using the F_SETFL command of the fcntl + system call. This is a standard system call, documented in the Linux manual + page for fcntl. When an open() call has succeeded, the device will be ready + for use in the specified mode. This implies that the corresponding hardware is + powered up, and that other front-ends may have been powered down to make + that possible. + + + +SYNOPSIS + +int open(const char ⋆deviceName, int flags); + + +PARAMETERS + + +const char + *deviceName + +Name of specific video device. + + +int flags + +A bit-wise OR of the following flags: + + + +O_RDONLY read-only access + + + +O_RDWR read/write access + + + +O_NONBLOCK open in non-blocking mode + + + +(blocking mode is the default) + + + + +ERRORS + + +ENODEV + +Device driver not loaded/available. + + +EINTERNAL + +Internal error. + + +EBUSY + +Device or resource busy. + + +EINVAL + +Invalid argument. + + +
+ +
+close() +DESCRIPTION + + +This system call closes a previously opened front-end device. After closing + a front-end device, its corresponding hardware might be powered down + automatically. + + +SYNOPSIS + + +int close(int fd); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +
+ +
+FE_READ_STATUS +DESCRIPTION + + +This ioctl call returns status information about the front-end. This call only + requires read-only access to the device. + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_READ_STATUS, + fe_status_t ⋆status); + + +PARAMETERS + + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_READ_STATUS for this command. + + +struct fe_status_t + *status + +Points to the location where the front-end status word is + to be stored. + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +status points to invalid address. + + +
+ +
+FE_READ_BER +DESCRIPTION + + +This ioctl call returns the bit error rate for the signal currently + received/demodulated by the front-end. For this command, read-only access to + the device is sufficient. + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_READ_BER, + uint32_t ⋆ber); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_READ_BER for this command. + + +uint32_t *ber + +The bit error rate is stored into *ber. + + + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +ber points to invalid address. + + +ENOSIGNAL + +There is no signal, thus no meaningful bit error rate. Also + returned if the front-end is not turned on. + + +ENOSYS + +Function not available for this device. + + +
+ +
+FE_READ_SNR + +DESCRIPTION + + +This ioctl call returns the signal-to-noise ratio for the signal currently received + by the front-end. For this command, read-only access to the device is sufficient. + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_READ_SNR, int16_t + ⋆snr); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_READ_SNR for this command. + + +int16_t *snr + +The signal-to-noise ratio is stored into *snr. + + + + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +snr points to invalid address. + + +ENOSIGNAL + +There is no signal, thus no meaningful signal strength + value. Also returned if front-end is not turned on. + + +ENOSYS + +Function not available for this device. + + +
+ +
+FE_READ_SIGNAL_STRENGTH +DESCRIPTION + + +This ioctl call returns the signal strength value for the signal currently received + by the front-end. For this command, read-only access to the device is sufficient. + + +SYNOPSIS + + +int ioctl( int fd, int request = + FE_READ_SIGNAL_STRENGTH, int16_t ⋆strength); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_READ_SIGNAL_STRENGTH for this + command. + + +int16_t *strength + +The signal strength value is stored into *strength. + + + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +status points to invalid address. + + +ENOSIGNAL + +There is no signal, thus no meaningful signal strength + value. Also returned if front-end is not turned on. + + +ENOSYS + +Function not available for this device. + + +
+ +
+FE_READ_UNCORRECTED_BLOCKS +DESCRIPTION + + +This ioctl call returns the number of uncorrected blocks detected by the device + driver during its lifetime. For meaningful measurements, the increment in block + count during a specific time interval should be calculated. For this command, + read-only access to the device is sufficient. + + +Note that the counter will wrap to zero after its maximum count has been + reached. + + +SYNOPSIS + + +int ioctl( int fd, int request = + FE_READ_UNCORRECTED_BLOCKS, uint32_t ⋆ublocks); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_READ_UNCORRECTED_BLOCKS for this + command. + + +uint32_t *ublocks + +The total number of uncorrected blocks seen by the driver + so far. + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +ublocks points to invalid address. + + +ENOSYS + +Function not available for this device. + + +
+ +
+FE_SET_FRONTEND +DESCRIPTION + + +This ioctl call starts a tuning operation using specified parameters. The result + of this call will be successful if the parameters were valid and the tuning could + be initiated. The result of the tuning operation in itself, however, will arrive + asynchronously as an event (see documentation for FE_GET_EVENT and + FrontendEvent.) If a new FE_SET_FRONTEND operation is initiated before + the previous one was completed, the previous operation will be aborted in favor + of the new one. This command requires read/write access to the device. + + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_SET_FRONTEND, + struct dvb_frontend_parameters ⋆p); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_SET_FRONTEND for this command. + + +struct + dvb_frontend_parameters + *p + +Points to parameters for tuning operation. + + + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +p points to invalid address. + + +EINVAL + +Maximum supported symbol rate reached. + + +
+ +
+FE_GET_FRONTEND +DESCRIPTION + + +This ioctl call queries the currently effective frontend parameters. For this + command, read-only access to the device is sufficient. + + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_GET_FRONTEND, + struct dvb_frontend_parameters ⋆p); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_SET_FRONTEND for this command. + + +struct + dvb_frontend_parameters + *p + +Points to parameters for tuning operation. + + + + + +ERRORS + + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +p points to invalid address. + + +EINVAL + +Maximum supported symbol rate reached. + + + +
+ +
+FE_GET_EVENT +DESCRIPTION + + +This ioctl call returns a frontend event if available. If an event is not + available, the behavior depends on whether the device is in blocking or + non-blocking mode. In the latter case, the call fails immediately with errno + set to EWOULDBLOCK. In the former case, the call blocks until an event + becomes available. + + +The standard Linux poll() and/or select() system calls can be used with the + device file descriptor to watch for new events. For select(), the file descriptor + should be included in the exceptfds argument, and for poll(), POLLPRI should + be specified as the wake-up condition. Since the event queue allocated is + rather small (room for 8 events), the queue must be serviced regularly to avoid + overflow. If an overflow happens, the oldest event is discarded from the queue, + and an error (EOVERFLOW) occurs the next time the queue is read. After + reporting the error condition in this fashion, subsequent FE_GET_EVENT + calls will return events from the queue as usual. + + +For the sake of implementation simplicity, this command requires read/write + access to the device. + + + +SYNOPSIS + + +int ioctl(int fd, int request = QPSK_GET_EVENT, + struct dvb_frontend_event ⋆ev); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_GET_EVENT for this command. + + +struct + dvb_frontend_event + *ev + +Points to the location where the event, + + + +if any, is to be stored. + + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +ev points to invalid address. + + +EWOULDBLOCK + +There is no event pending, and the device is in + non-blocking mode. + + +EOVERFLOW + + + + +Overflow in event queue - one or more events were lost. + + +
+ +
+FE_GET_INFO +DESCRIPTION + + +This ioctl call returns information about the front-end. This call only requires + read-only access to the device. + + +SYNOPSIS + + + + int ioctl(int fd, int request = FE_GET_INFO, struct + dvb_frontend_info ⋆info); + + +PARAMETERS + + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_GET_INFO for this command. + + +struct + dvb_frontend_info + *info + +Points to the location where the front-end information is + to be stored. + + +ERRORS + + +EBADF + +fd is not a valid open file descriptor. + + +EFAULT + +info points to invalid address. + + +
+ +
+FE_DISEQC_RESET_OVERLOAD +DESCRIPTION + + +If the bus has been automatically powered off due to power overload, this ioctl + call restores the power to the bus. The call requires read/write access to the + device. This call has no effect if the device is manually powered off. Not all + DVB adapters support this ioctl. + + + +SYNOPSIS + + +int ioctl(int fd, int request = + FE_DISEQC_RESET_OVERLOAD); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_DISEQC_RESET_OVERLOAD for this + command. + + + + + +ERRORS + + +EBADF + +fd is not a valid file descriptor. + + +EPERM + +Permission denied (needs read/write access). + + +EINTERNAL + +Internal error in the device driver. + + +
+ +
+FE_DISEQC_SEND_MASTER_CMD +DESCRIPTION + + +This ioctl call is used to send a a DiSEqC command. + + + + +SYNOPSIS + + +int ioctl(int fd, int request = + FE_DISEQC_SEND_MASTER_CMD, struct + dvb_diseqc_master_cmd ⋆cmd); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_DISEQC_SEND_MASTER_CMD for this + command. + + +struct + dvb_diseqc_master_cmd + *cmd + +Pointer to the command to be transmitted. + + + + + +ERRORS + + +EBADF + +fd is not a valid file descriptor. + + +EFAULT + +Seq points to an invalid address. + + +EINVAL + +The data structure referred to by seq is invalid in some + way. + + +EPERM + +Permission denied (needs read/write access). + + +EINTERNAL + +Internal error in the device driver. + + +
+ +
+FE_DISEQC_RECV_SLAVE_REPLY +DESCRIPTION + + +This ioctl call is used to receive reply to a DiSEqC 2.0 command. + + + + + +SYNOPSIS + + +int ioctl(int fd, int request = + FE_DISEQC_RECV_SLAVE_REPLY, struct + dvb_diseqc_slave_reply ⋆reply); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_DISEQC_RECV_SLAVE_REPLY for this + command. + + +struct + dvb_diseqc_slave_reply + *reply + +Pointer to the command to be received. + + + + +ERRORS + + +EBADF + +fd is not a valid file descriptor. + + +EFAULT + +Seq points to an invalid address. + + +EINVAL + +The data structure referred to by seq is invalid in some + way. + + +EPERM + +Permission denied (needs read/write access). + + +EINTERNAL + +Internal error in the device driver. + + +
+ +
+FE_DISEQC_SEND_BURST +DESCRIPTION + + +This ioctl call is used to send a 22KHz tone burst. + + + + + +SYNOPSIS + + +int ioctl(int fd, int request = + FE_DISEQC_SEND_BURST, fe_sec_mini_cmd_t burst); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_DISEQC_SEND_BURST for this command. + + +fe_sec_mini_cmd_t + burst + +burst A or B. + + + + + +ERRORS + + +EBADF + +fd is not a valid file descriptor. + + +EFAULT + +Seq points to an invalid address. + + +EINVAL + +The data structure referred to by seq is invalid in some + way. + + +EPERM + +Permission denied (needs read/write access). + + +EINTERNAL + +Internal error in the device driver. + + +
+ +
+FE_SET_TONE +DESCRIPTION + + +This call is used to set the generation of the continuous 22kHz tone. This call + requires read/write permissions. + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_SET_TONE, + fe_sec_tone_mode_t tone); + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_SET_TONE for this command. + + +fe_sec_tone_mode_t + tone + +The requested tone generation mode (on/off). + + + + +ERRORS + + +ENODEV + +Device driver not loaded/available. + + +EBUSY + +Device or resource busy. + + +EINVAL + +Invalid argument. + + +EPERM + +File not opened with read permissions. + + +EINTERNAL + +Internal error in the device driver. + + +
+ +
+FE_SET_VOLTAGE +DESCRIPTION + + +This call is used to set the bus voltage. This call requires read/write + permissions. + + +SYNOPSIS + + +int ioctl(int fd, int request = FE_SET_VOLTAGE, + fe_sec_voltage_t voltage); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_SET_VOLTAGE for this command. + + +fe_sec_voltage_t + voltage + +The requested bus voltage. + + + + + +ERRORS + + +ENODEV + +Device driver not loaded/available. + + +EBUSY + +Device or resource busy. + + +EINVAL + +Invalid argument. + + +EPERM + +File not opened with read permissions. + + +EINTERNAL + +Internal error in the device driver. + + +
+ +
+FE_ENABLE_HIGH_LNB_VOLTAGE +DESCRIPTION + + +If high != 0 enables slightly higher voltages instead of 13/18V (to compensate + for long cables). This call requires read/write permissions. Not all DVB + adapters support this ioctl. + + + +SYNOPSIS + + +int ioctl(int fd, int request = + FE_ENABLE_HIGH_LNB_VOLTAGE, int high); + + + +PARAMETERS + + +int fd + +File descriptor returned by a previous call to open(). + + +int request + +Equals FE_SET_VOLTAGE for this command. + + +int high + +The requested bus voltage. + + + + + +ERRORS + + +ENODEV + +Device driver not loaded/available. + + +EBUSY + +Device or resource busy. + + +EINVAL + +Invalid argument. + + +EPERM + +File not opened with read permissions. + + +EINTERNAL + +Internal error in the device driver. + + +
+
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