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…/git/mchehab/linux-2.6 * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (213 commits) V4L/DVB (12720): em28xx-cards: Add vendor/product id for Kworld DVD Maker 2 V4L/DVB (12713): em28xx: Cleanups at ir_i2c handler V4L/DVB (12712): em28xx: properly load ir-kbd-i2c when needed V4L/DVB (12701): saa7134: ir-kbd-i2c init data needs a persistent object V4L/DVB (12699): cx18: ir-kbd-i2c initialization data should point to a persistent object V4L/DVB (12698): em28xx: ir-kbd-i2c init data needs a persistent object V4L/DVB (12707): gspca - sn9c20x: Add SXGA support to MT9M111 V4L/DVB (12706): gspca - sn9c20x: disable exposure/gain controls for MT9M111 sensors. V4L/DVB (12705): gspca - sn9c20x: Add SXGA support to SOI968 V4L/DVB (12703): gspca - sn9c20x: Reduces size of object V4L/DVB (12704): gspca - sn9c20x: Fix exposure on SOI968 sensors V4L/DVB (12696): gspca - sonixj / sn9c102: Two drivers for 0c45:60fc and 0c45:613e. V4L/DVB (12695): gspca - vc032x: Do the LED work with the sensor hv7131r. V4L/DVB (12694): gspca - vc032x: Change the start exchanges of the sensor hv7131r. V4L/DVB (12693): gspca - sunplus: The brightness is signed. V4L/DVB (12692): gspca - sunplus: Optimize code. V4L/DVB (12691): gspca - sonixj: Don't use mdelay(). V4L/DVB (12690): gspca - pac7311: Webcam 06f8:3009 added. V4L/DVB (12686): dvb-core: check supported QAM modulations V4L/DVB (12685): dvb-core: check fe->ops.set_frontend return value ...
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| Original file line number | Diff line number | Diff line change |
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| Driver for I2C radios for the Silicon Labs Si4713 FM Radio Transmitters | ||
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| Copyright (c) 2009 Nokia Corporation | ||
| Contact: Eduardo Valentin <eduardo.valentin@nokia.com> | ||
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| Information about the Device | ||
| ============================ | ||
| This chip is a Silicon Labs product. It is a I2C device, currently on 0x63 address. | ||
| Basically, it has transmission and signal noise level measurement features. | ||
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| The Si4713 integrates transmit functions for FM broadcast stereo transmission. | ||
| The chip also allows integrated receive power scanning to identify low signal | ||
| power FM channels. | ||
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| The chip is programmed using commands and responses. There are also several | ||
| properties which can change the behavior of this chip. | ||
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| Users must comply with local regulations on radio frequency (RF) transmission. | ||
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| Device driver description | ||
| ========================= | ||
| There are two modules to handle this device. One is a I2C device driver | ||
| and the other is a platform driver. | ||
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| The I2C device driver exports a v4l2-subdev interface to the kernel. | ||
| All properties can also be accessed by v4l2 extended controls interface, by | ||
| using the v4l2-subdev calls (g_ext_ctrls, s_ext_ctrls). | ||
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| The platform device driver exports a v4l2 radio device interface to user land. | ||
| So, it uses the I2C device driver as a sub device in order to send the user | ||
| commands to the actual device. Basically it is a wrapper to the I2C device driver. | ||
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| Applications can use v4l2 radio API to specify frequency of operation, mute state, | ||
| etc. But mostly of its properties will be present in the extended controls. | ||
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| When the v4l2 mute property is set to 1 (true), the driver will turn the chip off. | ||
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| Properties description | ||
| ====================== | ||
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| The properties can be accessed using v4l2 extended controls. | ||
| Here is an output from v4l2-ctl util: | ||
| / # v4l2-ctl -d /dev/radio0 --all -L | ||
| Driver Info: | ||
| Driver name : radio-si4713 | ||
| Card type : Silicon Labs Si4713 Modulator | ||
| Bus info : | ||
| Driver version: 0 | ||
| Capabilities : 0x00080800 | ||
| RDS Output | ||
| Modulator | ||
| Audio output: 0 (FM Modulator Audio Out) | ||
| Frequency: 1408000 (88.000000 MHz) | ||
| Video Standard = 0x00000000 | ||
| Modulator: | ||
| Name : FM Modulator | ||
| Capabilities : 62.5 Hz stereo rds | ||
| Frequency range : 76.0 MHz - 108.0 MHz | ||
| Subchannel modulation: stereo+rds | ||
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| User Controls | ||
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| mute (bool) : default=1 value=0 | ||
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| FM Radio Modulator Controls | ||
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| rds_signal_deviation (int) : min=0 max=90000 step=10 default=200 value=200 flags=slider | ||
| rds_program_id (int) : min=0 max=65535 step=1 default=0 value=0 | ||
| rds_program_type (int) : min=0 max=31 step=1 default=0 value=0 | ||
| rds_ps_name (str) : min=0 max=96 step=8 value='si4713 ' | ||
| rds_radio_text (str) : min=0 max=384 step=32 value='' | ||
| audio_limiter_feature_enabled (bool) : default=1 value=1 | ||
| audio_limiter_release_time (int) : min=250 max=102390 step=50 default=5010 value=5010 flags=slider | ||
| audio_limiter_deviation (int) : min=0 max=90000 step=10 default=66250 value=66250 flags=slider | ||
| audio_compression_feature_enabl (bool) : default=1 value=1 | ||
| audio_compression_gain (int) : min=0 max=20 step=1 default=15 value=15 flags=slider | ||
| audio_compression_threshold (int) : min=-40 max=0 step=1 default=-40 value=-40 flags=slider | ||
| audio_compression_attack_time (int) : min=0 max=5000 step=500 default=0 value=0 flags=slider | ||
| audio_compression_release_time (int) : min=100000 max=1000000 step=100000 default=1000000 value=1000000 flags=slider | ||
| pilot_tone_feature_enabled (bool) : default=1 value=1 | ||
| pilot_tone_deviation (int) : min=0 max=90000 step=10 default=6750 value=6750 flags=slider | ||
| pilot_tone_frequency (int) : min=0 max=19000 step=1 default=19000 value=19000 flags=slider | ||
| pre_emphasis_settings (menu) : min=0 max=2 default=1 value=1 | ||
| tune_power_level (int) : min=0 max=120 step=1 default=88 value=88 flags=slider | ||
| tune_antenna_capacitor (int) : min=0 max=191 step=1 default=0 value=110 flags=slider | ||
| / # | ||
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| Here is a summary of them: | ||
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| * Pilot is an audible tone sent by the device. | ||
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| pilot_frequency - Configures the frequency of the stereo pilot tone. | ||
| pilot_deviation - Configures pilot tone frequency deviation level. | ||
| pilot_enabled - Enables or disables the pilot tone feature. | ||
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| * The si4713 device is capable of applying audio compression to the transmitted signal. | ||
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| acomp_enabled - Enables or disables the audio dynamic range control feature. | ||
| acomp_gain - Sets the gain for audio dynamic range control. | ||
| acomp_threshold - Sets the threshold level for audio dynamic range control. | ||
| acomp_attack_time - Sets the attack time for audio dynamic range control. | ||
| acomp_release_time - Sets the release time for audio dynamic range control. | ||
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| * Limiter setups audio deviation limiter feature. Once a over deviation occurs, | ||
| it is possible to adjust the front-end gain of the audio input and always | ||
| prevent over deviation. | ||
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| limiter_enabled - Enables or disables the limiter feature. | ||
| limiter_deviation - Configures audio frequency deviation level. | ||
| limiter_release_time - Sets the limiter release time. | ||
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| * Tuning power | ||
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| power_level - Sets the output power level for signal transmission. | ||
| antenna_capacitor - This selects the value of antenna tuning capacitor manually | ||
| or automatically if set to zero. | ||
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| * RDS related | ||
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| rds_ps_name - Sets the RDS ps name field for transmission. | ||
| rds_radio_text - Sets the RDS radio text for transmission. | ||
| rds_pi - Sets the RDS PI field for transmission. | ||
| rds_pty - Sets the RDS PTY field for transmission. | ||
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| * Region related | ||
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| preemphasis - sets the preemphasis to be applied for transmission. | ||
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| RNL | ||
| === | ||
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| This device also has an interface to measure received noise level. To do that, you should | ||
| ioctl the device node. Here is an code of example: | ||
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| int main (int argc, char *argv[]) | ||
| { | ||
| struct si4713_rnl rnl; | ||
| int fd = open("/dev/radio0", O_RDWR); | ||
| int rval; | ||
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| if (argc < 2) | ||
| return -EINVAL; | ||
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| if (fd < 0) | ||
| return fd; | ||
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| sscanf(argv[1], "%d", &rnl.frequency); | ||
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| rval = ioctl(fd, SI4713_IOC_MEASURE_RNL, &rnl); | ||
| if (rval < 0) | ||
| return rval; | ||
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| printf("received noise level: %d\n", rnl.rnl); | ||
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| close(fd); | ||
| } | ||
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| The struct si4713_rnl and SI4713_IOC_MEASURE_RNL are defined under | ||
| include/media/si4713.h. | ||
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| Stereo/Mono and RDS subchannels | ||
| =============================== | ||
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| The device can also be configured using the available sub channels for | ||
| transmission. To do that use S/G_MODULATOR ioctl and configure txsubchans properly. | ||
| Refer to v4l2-spec for proper use of this ioctl. | ||
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| Testing | ||
| ======= | ||
| Testing is usually done with v4l2-ctl utility for managing FM tuner cards. | ||
| The tool can be found in v4l-dvb repository under v4l2-apps/util directory. | ||
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| Example for setting rds ps name: | ||
| # v4l2-ctl -d /dev/radio0 --set-ctrl=rds_ps_name="Dummy" | ||
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