From: Eero Nurkkala <[email protected]>
This patchset adds the BCM2048 radio driver code.
BCM2048 is radio is integrated in the BCM2048 chipset
that contains the Bluetooth also.
There's quite some sysfs entries introduced here;
But only a very few of them is meant to be used besides
debugging/experimental purposes:
"rds" (rds switch, off/on)
"fm_search_rssi_threshold" (threshold for V4L2_CAP_HW_FREQ_SEEK)
"region" (current region information)
"region_bottom_frequency"
"region_top_frequency"
Unlike V4L2 suggests, the code has also a reference
implementation for a partial RDS decoder; I understand that
this should be done in userspace. However, the decoded
RDS data may be read off from the sysfs nodes also:
"rds_pi" (RDS PI code)
"rds_rt" (RDS Radio Text)
"rds_ps" (RDS PS)
It would be nice to know, how RDS enabling/disabling takes
place in V4L2.
Below is the list of all sysfs entries; However, like mentioned,
only the above (8) sysfs nodes should be used along with the
V4L2. The sysfs nodes below, with the exception of the 8 ones
above, should only be used for debugging/experiments only.
And they do a good job for such purposes ;)
audio_route (DAC, I2S)
dac_output (OFF, LEFT, RIGHT, LEFT/RIGHT)
fm_af_frequency (Alternate Frequency)
fm_best_tune_mode (Best tune mode; tuning method)
fm_carrier_error (FM carrier error)
fm_deemphasis (De-emphasis)
fm_frequency (frequency)
fm_hi_lo_injection (Injection control)
fm_rds_flags (RDS IRQ flags)
fm_rds_mask (RDS IRQ Mask)
fm_rssi (Current channel RSSI level)
fm_search_mode_direction (UP, DOWN)
fm_search_rssi_threshold (HW seek threshold search level)
fm_search_tune_mode (stop all, preset, hw seek, AF jump)
mute (off, on)
power_state (off, on)
rds (off, on)
rds_b_block_mask (RDS b block IRQ mask)
rds_b_block_match (RDS b block IRQ match)
rds_data (Raw RDS data for debugging)
rds_pi (RDS PI code)
rds_pi_mask (RDS PI mask)
rds_pi_match (RDS PI match)
rds_ps (RDS PS)
rds_rt (RDS radiotext)
rds_wline (RDS FIFO watermark level)
region
region_bottom_frequency
region_top_frequency
All comments are very welcome! Like mentioned, I'm aware of
the somewhat ugly set of syfs nodes. For debugging/experiments,
I would guess they're not that bad; but for real usage, they
should be integrated into the V4L2?
Eero Nurkkala (2):
V4L: Add BCM2048 radio driver
V4L: Add BCM2048 radio driver Makefile and Kconfig dependencies
drivers/media/radio/Kconfig | 10 +
drivers/media/radio/Makefile | 1 +
drivers/media/radio/radio-bcm2048.c | 2613 +++++++++++++++++++++++++++++++++++
include/media/radio-bcm2048.h | 30 +
4 files changed, 2654 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/radio/radio-bcm2048.c
create mode 100644 include/media/radio-bcm2048.h
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