Add BPF decoders to ir-keytable

This is not ready for merging yet, however while I finish this work I would like some feedback and ideas.

The idea is that IR decoders can be written in C, compiled to BPF relocatable object file. Any global variables can overriden, so we can supports lots of variants of similiar protocols (just like in the lircd.conf file).

The existing rc_keymap file format can't be used for variables, so I've converted the format to toml. An alternative would be to use the existing lircd.conf file format, but it's a very awkward file to parse in C and it contains many features which are irrelevant to us.

We use libelf to load the bpf relocatable object file.

After loading our example grundig keymap with bpf decoder, the output of ir-keytable is:

Found /sys/class/rc/rc0/ (/dev/input/event8) with:
Name: Winbond CIR
Driver: winbond-cir, table: rc-rc6-mce
lirc device: /dev/lirc0
Attached bpf protocols: grundig
Supported protocols: lirc rc-5 rc-5-sz jvc sony nec sanyo mce_kbd rc-6 sharp xmp imon Enabled protocols: lirc
bus: 25, vendor/product: 10ad:00f1, version: 0x0004
Repeat delay = 500 ms, repeat period = 125 ms

Steps to complete this work:
- Write more IR decoders
- More rc_keymaps
- More testing
- lircd.conf to toml converter script (python/perl?)

Sean Young (4):
keytable: add toml keymap reader
keytable: convert keymaps to new toml format
keytable: add support for BPF based decoders
keytable: add bpf protocols

 Makefile.am                                   |    4 +-
 configure.ac                                  |   16 +
 include/linux/bpf.h                           | 2644 +++++++++++++++++
 utils/keytable/Makefile.am                    |   13 +-
 utils/keytable/bpf.c                          |  515 ++++
 utils/keytable/bpf.h                          |  110 +
 utils/keytable/bpf_load.c                     |  457 +++
 utils/keytable/bpf_load.h                     |   41 +
 utils/keytable/bpf_protocols/Makefile.am      |   14 +
 utils/keytable/bpf_protocols/bpf_helpers.h    |  302 ++
 utils/keytable/bpf_protocols/grundig.c        |  113 +
 utils/keytable/gen_keytables.pl               |   33 +-
 utils/keytable/ir-keytable.1.in               |    4 +-
 utils/keytable/keytable.c                     |  370 ++-
 utils/keytable/rc_keymaps/adstech_dvb_t_pci   |   45 -
 .../rc_keymaps/adstech_dvb_t_pci.toml         |   47 +
 utils/keytable/rc_keymaps/af9005              |   37 -
 utils/keytable/rc_keymaps/af9005.toml         |   39 +
 utils/keytable/rc_keymaps/alink_dtu_m         |   19 -
 utils/keytable/rc_keymaps/alink_dtu_m.toml    |   23 +
 .../keytable/rc_keymaps/allwinner_ba10_tv_box |   15 -
 .../rc_keymaps/allwinner_i12_a20_tv_box       |   28 -
 utils/keytable/rc_keymaps/anysee              |   45 -
 utils/keytable/rc_keymaps/anysee.toml         |   49 +
 utils/keytable/rc_keymaps/apac_viewcomp       |   32 -
 utils/keytable/rc_keymaps/apac_viewcomp.toml  |   34 +
 utils/keytable/rc_keymaps/astrometa_t2hybrid  |   22 -
 .../rc_keymaps/astrometa_t2hybrid.toml        |   26 +
 utils/keytable/rc_keymaps/asus_pc39           |   40 -
 utils/keytable/rc_keymaps/asus_pc39.toml      |   44 +
 utils/keytable/rc_keymaps/asus_ps3_100        |   42 -
 utils/keytable/rc_keymaps/asus_ps3_100.toml   |   46 +
 .../keytable/rc_keymaps/ati_tv_wonder_hd_600  |   25 -
 .../rc_keymaps/ati_tv_wonder_hd_600.toml      |   27 +
 utils/keytable/rc_keymaps/ati_x10             |   49 -
 utils/keytable/rc_keymaps/ati_x10.toml        |   51 +
 utils/keytable/rc_keymaps/avermedia           |   37 -
 utils/keytable/rc_keymaps/avermedia.toml      |   39 +
 utils/keytable/rc_keymaps/avermedia_a16d      |   35 -
 utils/keytable/rc_keymaps/avermedia_a16d.toml |   37 +
 utils/keytable/rc_keymaps/avermedia_cardbus   |   55 -
 .../rc_keymaps/avermedia_cardbus.toml         |   57 +
 utils/keytable/rc_keymaps/avermedia_dvbt      |   35 -
 utils/keytable/rc_keymaps/avermedia_dvbt.toml |   37 +
 utils/keytable/rc_keymaps/avermedia_m135a     |   81 -
 .../keytable/rc_keymaps/avermedia_m135a.toml  |   85 +
 .../keytable/rc_keymaps/avermedia_m733a_rm_k6 |   45 -
 .../rc_keymaps/avermedia_m733a_rm_k6.toml     |   49 +
 utils/keytable/rc_keymaps/avermedia_rm_ks     |   28 -
 .../keytable/rc_keymaps/avermedia_rm_ks.toml  |   32 +
 utils/keytable/rc_keymaps/avertv_303          |   37 -
 utils/keytable/rc_keymaps/avertv_303.toml     |   39 +
 utils/keytable/rc_keymaps/az6027              |    3 -
 utils/keytable/rc_keymaps/az6027.toml         |    5 +
 utils/keytable/rc_keymaps/azurewave_ad_tu700  |   54 -
 .../rc_keymaps/azurewave_ad_tu700.toml        |   58 +
 utils/keytable/rc_keymaps/behold              |   35 -
 utils/keytable/rc_keymaps/behold.toml         |   39 +
 utils/keytable/rc_keymaps/behold_columbus     |   29 -
 .../keytable/rc_keymaps/behold_columbus.toml  |   31 +
 utils/keytable/rc_keymaps/budget_ci_old       |   46 -
 utils/keytable/rc_keymaps/budget_ci_old.toml  |   48 +
 utils/keytable/rc_keymaps/cec                 |   98 -
 utils/keytable/rc_keymaps/cec.toml            |  100 +
 utils/keytable/rc_keymaps/cinergy             |   37 -
 utils/keytable/rc_keymaps/cinergy.toml        |   39 +
 utils/keytable/rc_keymaps/cinergy_1400        |   38 -
 utils/keytable/rc_keymaps/cinergy_1400.toml   |   40 +
 utils/keytable/rc_keymaps/cinergyt2           |   38 -
 utils/keytable/rc_keymaps/cinergyt2.toml      |   40 +
 utils/keytable/rc_keymaps/d680_dmb            |   36 -
 utils/keytable/rc_keymaps/d680_dmb.toml       |   38 +
 utils/keytable/rc_keymaps/delock_61959        |   33 -
 utils/keytable/rc_keymaps/delock_61959.toml   |   37 +
 utils/keytable/rc_keymaps/dib0700_nec         |   71 -
 utils/keytable/rc_keymaps/dib0700_nec.toml    |   75 +
 utils/keytable/rc_keymaps/dib0700_rc5         |  181 --
 utils/keytable/rc_keymaps/dib0700_rc5.toml    |  185 ++
 utils/keytable/rc_keymaps/dibusb              |  112 -
 utils/keytable/rc_keymaps/dibusb.toml         |  114 +
 utils/keytable/rc_keymaps/digitalnow_tinytwin |   50 -
 .../rc_keymaps/digitalnow_tinytwin.toml       |   54 +
 utils/keytable/rc_keymaps/digittrade          |   29 -
 utils/keytable/rc_keymaps/digittrade.toml     |   33 +
 utils/keytable/rc_keymaps/digitv              |   56 -
 utils/keytable/rc_keymaps/digitv.toml         |   58 +
 utils/keytable/rc_keymaps/dm1105_nec          |   32 -
 utils/keytable/rc_keymaps/dm1105_nec.toml     |   34 +
 utils/keytable/rc_keymaps/dntv_live_dvb_t     |   33 -
 .../keytable/rc_keymaps/dntv_live_dvb_t.toml  |   35 +
 utils/keytable/rc_keymaps/dntv_live_dvbt_pro  |   54 -
 .../rc_keymaps/dntv_live_dvbt_pro.toml        |   56 +
 utils/keytable/rc_keymaps/dtt200u             |   19 -
 utils/keytable/rc_keymaps/dtt200u.toml        |   23 +
 utils/keytable/rc_keymaps/dvbsky              |   33 -
 utils/keytable/rc_keymaps/dvbsky.toml         |   37 +
 utils/keytable/rc_keymaps/dvico_mce           |   46 -
 utils/keytable/rc_keymaps/dvico_mce.toml      |   50 +
 utils/keytable/rc_keymaps/dvico_portable      |   37 -
 utils/keytable/rc_keymaps/dvico_portable.toml |   41 +
 utils/keytable/rc_keymaps/em_terratec         |   29 -
 utils/keytable/rc_keymaps/em_terratec.toml    |   31 +
 utils/keytable/rc_keymaps/encore_enltv        |   53 -
 utils/keytable/rc_keymaps/encore_enltv.toml   |   55 +
 utils/keytable/rc_keymaps/encore_enltv2       |   40 -
 utils/keytable/rc_keymaps/encore_enltv2.toml  |   42 +
 utils/keytable/rc_keymaps/encore_enltv_fm53   |   30 -
 .../rc_keymaps/encore_enltv_fm53.toml         |   32 +
 utils/keytable/rc_keymaps/evga_indtube        |   17 -
 utils/keytable/rc_keymaps/evga_indtube.toml   |   19 +
 utils/keytable/rc_keymaps/eztv                |   45 -
 utils/keytable/rc_keymaps/eztv.toml           |   47 +
 utils/keytable/rc_keymaps/flydvb              |   33 -
 utils/keytable/rc_keymaps/flydvb.toml         |   35 +
 utils/keytable/rc_keymaps/flyvideo            |   28 -
 utils/keytable/rc_keymaps/flyvideo.toml       |   30 +
 utils/keytable/rc_keymaps/fusionhdtv_mce      |   46 -
 utils/keytable/rc_keymaps/fusionhdtv_mce.toml |   48 +
 utils/keytable/rc_keymaps/gadmei_rm008z       |   32 -
 utils/keytable/rc_keymaps/gadmei_rm008z.toml  |   34 +
 utils/keytable/rc_keymaps/geekbox             |   13 -
 utils/keytable/rc_keymaps/geekbox.toml        |   17 +
 utils/keytable/rc_keymaps/genius_tvgo_a11mce  |   33 -
 .../rc_keymaps/genius_tvgo_a11mce.toml        |   35 +
 utils/keytable/rc_keymaps/gotview7135         |   35 -
 utils/keytable/rc_keymaps/gotview7135.toml    |   37 +
 utils/keytable/rc_keymaps/haupp               |   46 -
 utils/keytable/rc_keymaps/haupp.toml          |   48 +
 utils/keytable/rc_keymaps/hauppauge           |  173 --
 utils/keytable/rc_keymaps/hauppauge.toml      |  177 ++
 utils/keytable/rc_keymaps/hisi_poplar         |   30 -
 utils/keytable/rc_keymaps/hisi_poplar.toml    |   34 +
 utils/keytable/rc_keymaps/hisi_tv_demo        |   42 -
 utils/keytable/rc_keymaps/hisi_tv_demo.toml   |   46 +
 utils/keytable/rc_keymaps/imon_mce            |   78 -
 utils/keytable/rc_keymaps/imon_mce.toml       |   82 +
 utils/keytable/rc_keymaps/imon_pad            |   91 -
 utils/keytable/rc_keymaps/imon_pad.toml       |   93 +
 utils/keytable/rc_keymaps/imon_rsc            |   44 -
 utils/keytable/rc_keymaps/imon_rsc.toml       |   48 +
 utils/keytable/rc_keymaps/iodata_bctv7e       |   37 -
 utils/keytable/rc_keymaps/iodata_bctv7e.toml  |   39 +
 utils/keytable/rc_keymaps/it913x_v1           |   53 -
 utils/keytable/rc_keymaps/it913x_v1.toml      |   57 +
 utils/keytable/rc_keymaps/it913x_v2           |   48 -
 utils/keytable/rc_keymaps/it913x_v2.toml      |   52 +
 utils/keytable/rc_keymaps/kaiomy              |   33 -
 utils/keytable/rc_keymaps/kaiomy.toml         |   35 +
 utils/keytable/rc_keymaps/kworld_315u         |   33 -
 utils/keytable/rc_keymaps/kworld_315u.toml    |   37 +
 utils/keytable/rc_keymaps/kworld_pc150u       |   45 -
 utils/keytable/rc_keymaps/kworld_pc150u.toml  |   47 +
 .../keytable/rc_keymaps/kworld_plus_tv_analog |   32 -
 .../rc_keymaps/kworld_plus_tv_analog.toml     |   34 +
 utils/keytable/rc_keymaps/leadtek_y04g0051    |   51 -
 .../keytable/rc_keymaps/leadtek_y04g0051.toml |   55 +
 utils/keytable/rc_keymaps/lme2510             |   67 -
 utils/keytable/rc_keymaps/lme2510.toml        |   71 +
 utils/keytable/rc_keymaps/manli               |   32 -
 utils/keytable/rc_keymaps/manli.toml          |   34 +
 utils/keytable/rc_keymaps/medion_x10          |   54 -
 utils/keytable/rc_keymaps/medion_x10.toml     |   56 +
 .../keytable/rc_keymaps/medion_x10_digitainer |   50 -
 .../rc_keymaps/medion_x10_digitainer.toml     |   52 +
 utils/keytable/rc_keymaps/medion_x10_or2x     |   46 -
 .../keytable/rc_keymaps/medion_x10_or2x.toml  |   48 +
 utils/keytable/rc_keymaps/megasky             |   17 -
 utils/keytable/rc_keymaps/megasky.toml        |   19 +
 utils/keytable/rc_keymaps/msi_digivox_ii      |   19 -
 utils/keytable/rc_keymaps/msi_digivox_ii.toml |   23 +
 utils/keytable/rc_keymaps/msi_digivox_iii     |   33 -
 .../keytable/rc_keymaps/msi_digivox_iii.toml  |   37 +
 utils/keytable/rc_keymaps/msi_tvanywhere      |   25 -
 utils/keytable/rc_keymaps/msi_tvanywhere.toml |   27 +
 utils/keytable/rc_keymaps/msi_tvanywhere_plus |   37 -
 .../rc_keymaps/msi_tvanywhere_plus.toml       |   39 +
 utils/keytable/rc_keymaps/nebula              |   56 -
 utils/keytable/rc_keymaps/nebula.toml         |   60 +
 .../rc_keymaps/nec_terratec_cinergy_xs        |   86 -
 .../rc_keymaps/nec_terratec_cinergy_xs.toml   |   90 +
 utils/keytable/rc_keymaps/norwood             |   36 -
 utils/keytable/rc_keymaps/norwood.toml        |   38 +
 utils/keytable/rc_keymaps/npgtech             |   36 -
 utils/keytable/rc_keymaps/npgtech.toml        |   38 +
 utils/keytable/rc_keymaps/opera1              |   27 -
 utils/keytable/rc_keymaps/opera1.toml         |   29 +
 utils/keytable/rc_keymaps/pctv_sedna          |   33 -
 utils/keytable/rc_keymaps/pctv_sedna.toml     |   35 +
 utils/keytable/rc_keymaps/pinnacle310e        |   54 -
 utils/keytable/rc_keymaps/pinnacle310e.toml   |   56 +
 utils/keytable/rc_keymaps/pinnacle_color      |   43 -
 utils/keytable/rc_keymaps/pinnacle_color.toml |   45 +
 utils/keytable/rc_keymaps/pinnacle_grey       |   42 -
 utils/keytable/rc_keymaps/pinnacle_grey.toml  |   44 +
 utils/keytable/rc_keymaps/pinnacle_pctv_hd    |   27 -
 .../keytable/rc_keymaps/pinnacle_pctv_hd.toml |   31 +
 utils/keytable/rc_keymaps/pixelview           |   33 -
 utils/keytable/rc_keymaps/pixelview.toml      |   35 +
 utils/keytable/rc_keymaps/pixelview_002t      |   27 -
 utils/keytable/rc_keymaps/pixelview_002t.toml |   31 +
 utils/keytable/rc_keymaps/pixelview_mk12      |   32 -
 utils/keytable/rc_keymaps/pixelview_mk12.toml |   36 +
 utils/keytable/rc_keymaps/pixelview_new       |   32 -
 utils/keytable/rc_keymaps/pixelview_new.toml  |   34 +
 .../keytable/rc_keymaps/powercolor_real_angel |   36 -
 .../rc_keymaps/powercolor_real_angel.toml     |   38 +
 utils/keytable/rc_keymaps/proteus_2309        |   25 -
 utils/keytable/rc_keymaps/proteus_2309.toml   |   27 +
 utils/keytable/rc_keymaps/purpletv            |   36 -
 utils/keytable/rc_keymaps/purpletv.toml       |   38 +
 utils/keytable/rc_keymaps/pv951               |   32 -
 utils/keytable/rc_keymaps/pv951.toml          |   34 +
 utils/keytable/rc_keymaps/rc6_mce             |   65 -
 utils/keytable/rc_keymaps/rc6_mce.toml        |   69 +
 .../rc_keymaps/real_audio_220_32_keys         |   29 -
 .../rc_keymaps/real_audio_220_32_keys.toml    |   31 +
 utils/keytable/rc_keymaps/reddo               |   24 -
 utils/keytable/rc_keymaps/reddo.toml          |   28 +
 utils/keytable/rc_keymaps/snapstream_firefly  |   49 -
 .../rc_keymaps/snapstream_firefly.toml        |   51 +
 utils/keytable/rc_keymaps/streamzap           |   36 -
 utils/keytable/rc_keymaps/streamzap.toml      |   38 +
 utils/keytable/rc_keymaps/su3000              |   36 -
 utils/keytable/rc_keymaps/su3000.toml         |   40 +
 utils/keytable/rc_keymaps/tango               |   51 -
 utils/keytable/rc_keymaps/tango.toml          |   55 +
 utils/keytable/rc_keymaps/tbs_nec             |   35 -
 utils/keytable/rc_keymaps/tbs_nec.toml        |   37 +
 utils/keytable/rc_keymaps/technisat_ts35      |   34 -
 utils/keytable/rc_keymaps/technisat_ts35.toml |   36 +
 utils/keytable/rc_keymaps/technisat_usb2      |   34 -
 utils/keytable/rc_keymaps/technisat_usb2.toml |   38 +
 .../rc_keymaps/terratec_cinergy_c_pci         |   49 -
 .../rc_keymaps/terratec_cinergy_c_pci.toml    |   51 +
 .../rc_keymaps/terratec_cinergy_s2_hd         |   49 -
 .../rc_keymaps/terratec_cinergy_s2_hd.toml    |   51 +
 utils/keytable/rc_keymaps/terratec_cinergy_xs |   48 -
 .../rc_keymaps/terratec_cinergy_xs.toml       |   50 +
 utils/keytable/rc_keymaps/terratec_slim       |   29 -
 utils/keytable/rc_keymaps/terratec_slim.toml  |   33 +
 utils/keytable/rc_keymaps/terratec_slim_2     |   19 -
 .../keytable/rc_keymaps/terratec_slim_2.toml  |   23 +
 utils/keytable/rc_keymaps/tevii_nec           |   48 -
 utils/keytable/rc_keymaps/tevii_nec.toml      |   50 +
 utils/keytable/rc_keymaps/tivo                |   46 -
 utils/keytable/rc_keymaps/tivo.toml           |   48 +
 utils/keytable/rc_keymaps/total_media_in_hand |   36 -
 .../rc_keymaps/total_media_in_hand.toml       |   40 +
 .../rc_keymaps/total_media_in_hand_02         |   36 -
 .../rc_keymaps/total_media_in_hand_02.toml    |   40 +
 utils/keytable/rc_keymaps/trekstor            |   29 -
 utils/keytable/rc_keymaps/trekstor.toml       |   33 +
 utils/keytable/rc_keymaps/tt_1500             |   40 -
 utils/keytable/rc_keymaps/tt_1500.toml        |   44 +
 utils/keytable/rc_keymaps/tvwalkertwin        |   18 -
 utils/keytable/rc_keymaps/tvwalkertwin.toml   |   20 +
 utils/keytable/rc_keymaps/twinhan_dtv_cab_ci  |   54 -
 .../rc_keymaps/twinhan_dtv_cab_ci.toml        |   56 +
 utils/keytable/rc_keymaps/twinhan_vp1027_dvbs |   54 -
 .../rc_keymaps/twinhan_vp1027_dvbs.toml       |   58 +
 utils/keytable/rc_keymaps/videomate_k100      |   52 -
 utils/keytable/rc_keymaps/videomate_k100.toml |   54 +
 utils/keytable/rc_keymaps/videomate_s350      |   45 -
 utils/keytable/rc_keymaps/videomate_s350.toml |   47 +
 utils/keytable/rc_keymaps/videomate_tv_pvr    |   38 -
 .../keytable/rc_keymaps/videomate_tv_pvr.toml |   40 +
 utils/keytable/rc_keymaps/vp702x              |    3 -
 utils/keytable/rc_keymaps/vp702x.toml         |    5 +
 utils/keytable/rc_keymaps/winfast             |   57 -
 utils/keytable/rc_keymaps/winfast.toml        |   59 +
 .../keytable/rc_keymaps/winfast_usbii_deluxe  |   29 -
 .../rc_keymaps/winfast_usbii_deluxe.toml      |   31 +
 utils/keytable/rc_keymaps/wobo_i5             |    9 -
 utils/keytable/rc_keymaps/zx_irdec            |   41 -
 utils/keytable/rc_keymaps/zx_irdec.toml       |   45 +
 utils/keytable/rc_keymaps_bpf/RP75_LCD.toml   |   45 +
 .../allwinner_ba10_tv_box                     |   15 -
 .../allwinner_ba10_tv_box.toml                |   17 +
 .../allwinner_i12_a20_tv_box                  |   28 -
 .../allwinner_i12_a20_tv_box.toml             |   30 +
 utils/keytable/rc_keymaps_userspace/wobo_i5   |    9 -
 .../rc_keymaps_userspace/wobo_i5.toml         |   11 +
 utils/keytable/rc_maps.cfg                    |  268 +-
 utils/keytable/toml.c                         | 1903 ++++++++++++
 utils/keytable/toml.h                         |  110 +
 v4l-utils.spec.in                             |    2 +-
 286 files changed, 12689 insertions(+), 5725 deletions(-)
 create mode 100644 include/linux/bpf.h
 create mode 100644 utils/keytable/bpf.c
 create mode 100644 utils/keytable/bpf.h
 create mode 100644 utils/keytable/bpf_load.c
 create mode 100644 utils/keytable/bpf_load.h
 create mode 100644 utils/keytable/bpf_protocols/Makefile.am
 create mode 100644 utils/keytable/bpf_protocols/bpf_helpers.h
 create mode 100644 utils/keytable/bpf_protocols/grundig.c
 delete mode 100644 utils/keytable/rc_keymaps/adstech_dvb_t_pci
 create mode 100644 utils/keytable/rc_keymaps/adstech_dvb_t_pci.toml
 delete mode 100644 utils/keytable/rc_keymaps/af9005
 create mode 100644 utils/keytable/rc_keymaps/af9005.toml
 delete mode 100644 utils/keytable/rc_keymaps/alink_dtu_m
 create mode 100644 utils/keytable/rc_keymaps/alink_dtu_m.toml
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 create mode 100644 utils/keytable/rc_keymaps_bpf/RP75_LCD.toml
 delete mode 100644 utils/keytable/rc_keymaps_userspace/allwinner_ba10_tv_box
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 delete mode 100644 utils/keytable/rc_keymaps_userspace/allwinner_i12_a20_tv_box
 create mode 100644 utils/keytable/rc_keymaps_userspace/allwinner_i12_a20_tv_box.toml
 delete mode 100644 utils/keytable/rc_keymaps_userspace/wobo_i5
 create mode 100644 utils/keytable/rc_keymaps_userspace/wobo_i5.toml
 create mode 100644 utils/keytable/toml.c
 create mode 100644 utils/keytable/toml.h

2.17.0

We would like to add BPF based IR decoding in a later commit. BPF based IR decoding will have per-protocol parameters, so we need a more flexible format.

At some point in the future it would nice to change rc-core keycode mapping to protocol + 64 bit scancode -> keycode, rather the existing 32 bit scancode -> keycode. In order to make this possible, we want the scancodes to be specified for their protocol, in case multiple protocols are selected.

---
 utils/keytable/Makefile.am |    2 +-
 utils/keytable/keytable.c  |  174 +++-
 utils/keytable/toml.c      | 1903 ++++++++++++++++++++++++++++++++++++
 utils/keytable/toml.h      |  110 +++
 4 files changed, 2185 insertions(+), 4 deletions(-)
 create mode 100644 utils/keytable/toml.c
 create mode 100644 utils/keytable/toml.h

index 904aa96b..0bd7045f 100644
@@ -4,7 +4,7 @@ sysconf_DATA = rc_maps.cfg
 keytablesystem_DATA = $(srcdir)/rc_keymaps/*
 udevrules_DATA = 70-infrared.rules
 
-ir_keytable_SOURCES = keytable.c parse.h ir-encode.c ir-encode.h
+ir_keytable_SOURCES = keytable.c parse.h ir-encode.c ir-encode.h toml.c toml.h
 ir_keytable_LDADD = @LIBINTL@
 ir_keytable_LDFLAGS = $(ARGP_LIBS)
 

2.17.0

We use a modified version of samples/bpf/bpf_load.c from linux kernel tree to load elf based BPF decoders, clear them on '-c' and show the program ids when no commands are given.

Any global int variables can be overrided from toml. They are patched to be immediate loads.

---
 Makefile.am                |    4 +-
 configure.ac               |   11 +
 include/linux/bpf.h        | 2644 ++++++++++++++++++++++++++++++++++++
 utils/keytable/Makefile.am |    7 +-
 utils/keytable/bpf.c       |  515 +++++++
 utils/keytable/bpf.h       |  110 ++
 utils/keytable/bpf_load.c  |  457 +++++++
 utils/keytable/bpf_load.h  |   41 +
 utils/keytable/keytable.c  |  208 ++-
 v4l-utils.spec.in          |    2 +-
 10 files changed, 3989 insertions(+), 10 deletions(-)
 create mode 100644 include/linux/bpf.h
 create mode 100644 utils/keytable/bpf.c
 create mode 100644 utils/keytable/bpf.h
 create mode 100644 utils/keytable/bpf_load.c
 create mode 100644 utils/keytable/bpf_load.h

index fc8f2f34..38e17bab 100644
@@ -25,7 +25,8 @@ sync-with-kernel:
 	      ! -f $(KERNEL_DIR)/usr/include/linux/ivtv.h -o \
 	      ! -f $(KERNEL_DIR)/usr/include/linux/dvb/frontend.h -o \
 	      ! -f $(KERNEL_DIR)/usr/include/linux/dvb/dmx.h -o \
-	      ! -f $(KERNEL_DIR)/usr/include/linux/lirc.h ]; then \
+	      ! -f $(KERNEL_DIR)/usr/include/linux/lirc.h -o \
+	      ! -f $(KERNEL_DIR)/usr/include/linux/bpf.h ]; then \
 	  echo "Error you must set KERNEL_DIR to point to an extracted kernel source dir"; \
 	  echo "and run 'make headers_install' in \$$KERNEL_DIR."; \
 	  exit 1; \

@@ -43,6 +44,7 @@ sync-with-kernel:
 	cp $(top_srcdir)/include/linux/dvb/frontend.h $(top_srcdir)/lib/include/libdvbv5/dvb-frontend.h
 	cp -a $(KERNEL_DIR)/usr/include/linux/dvb/dmx.h $(top_srcdir)/include/linux/dvb
 	cp -a $(KERNEL_DIR)/usr/include/linux/lirc.h $(top_srcdir)/include/linux
+	cp -a $(KERNEL_DIR)/usr/include/linux/bpf.h $(top_srcdir)/include/linux
 	cp -a $(KERNEL_DIR)/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c $(top_srcdir)/utils/common
 	cp -a $(KERNEL_DIR)/drivers/media/common/v4l2-tpg/v4l2-tpg-colors.c $(top_srcdir)/utils/common
 	cp -a $(KERNEL_DIR)/include/media/tpg/v4l2-tpg* $(top_srcdir)/utils/common

index dc1e9cbf..1f48913c 100644
@@ -167,6 +167,16 @@ AC_SUBST([X11_CFLAGS])
 AC_SUBST([X11_LIBS])
 AM_CONDITIONAL([HAVE_X11], [test x$x11_pkgconfig = xyes])
 
+PKG_CHECK_MODULES([LIBELF], [libelf], [libelf_pkgconfig=yes], [libelf_pkgconfig=no])
+AC_SUBST([LIBELF_CFLAGS])
+AC_SUBST([LIBELF_LIBS])
+AM_CONDITIONAL([HAVE_LIBELF], [test x$libelf_pkgconfig = xyes])
+if test "x$libelf_pkgconfig" = "xyes"; then
+   AC_DEFINE([HAVE_LIBELF], [1], [libelf library is present])
+else
+   AC_MSG_WARN(libelf library not available)
+fi
+
 AS_IF([test "x$x11_pkgconfig" = xyes],
       [PKG_CHECK_MODULES(GL, [gl], [gl_pkgconfig=yes], [gl_pkgconfig=no])], [gl_pkgconfig=no])
 AC_SUBST([GL_CFLAGS])

@@ -497,6 +507,7 @@ compile time options summary
     X11                        : $x11_pkgconfig
     GL                         : $gl_pkgconfig
     glu                        : $glu_pkgconfig
+    libelf		       : $libelf_pkgconfig
     libjpeg                    : $have_jpeg
     libudev                    : $have_libudev
     pthread                    : $have_pthread

index 0bd7045f..df2b2231 100644
@@ -5,8 +5,13 @@ keytablesystem_DATA = $(srcdir)/rc_keymaps/*
 udevrules_DATA = 70-infrared.rules
 
 ir_keytable_SOURCES = keytable.c parse.h ir-encode.c ir-encode.h toml.c toml.h
+
+if HAVE_LIBELF
+ir_keytable_SOURCES += bpf.c bpf_load.c bpf.h bpf_load.h
+endif
+
 ir_keytable_LDADD = @LIBINTL@
-ir_keytable_LDFLAGS = $(ARGP_LIBS)
+ir_keytable_LDFLAGS = $(ARGP_LIBS) $(LIBELF_LIBS)
 
 EXTRA_DIST = 70-infrared.rules rc_keymaps rc_keymaps_userspace gen_keytables.pl ir-keytable.1 rc_maps.cfg
 

index bdbb27ba..f7be08b3 100644

2.17.0

Part of the diff is not shown here. View the raw message.

Add grundig decoder and infrastructure for build bpf protocols.

---
 configure.ac                                |   5 +
 utils/keytable/Makefile.am                  |   4 +
 utils/keytable/bpf_protocols/Makefile.am    |  14 +
 utils/keytable/bpf_protocols/bpf_helpers.h  | 302 ++++++++++++++++++++
 utils/keytable/bpf_protocols/grundig.c      | 113 ++++++++
 utils/keytable/rc_keymaps_bpf/RP75_LCD.toml |  45 +++
 v4l-utils.spec.in                           |   2 +-
 7 files changed, 484 insertions(+), 1 deletion(-)
 create mode 100644 utils/keytable/bpf_protocols/Makefile.am
 create mode 100644 utils/keytable/bpf_protocols/bpf_helpers.h
 create mode 100644 utils/keytable/bpf_protocols/grundig.c
 create mode 100644 utils/keytable/rc_keymaps_bpf/RP75_LCD.toml

index 1f48913c..8872a483 100644
@@ -23,6 +23,7 @@ AC_CONFIG_FILES([Makefile
 	utils/libmedia_dev/Makefile
 	utils/dvb/Makefile
 	utils/keytable/Makefile
+	utils/keytable/bpf_protocols/Makefile
 	utils/ir-ctl/Makefile
 	utils/cx18-ctl/Makefile
 	utils/ivtv-ctl/Makefile

@@ -172,11 +173,15 @@ AC_SUBST([LIBELF_CFLAGS])
 AC_SUBST([LIBELF_LIBS])
 AM_CONDITIONAL([HAVE_LIBELF], [test x$libelf_pkgconfig = xyes])
 if test "x$libelf_pkgconfig" = "xyes"; then
+   AC_CHECK_PROG([CLANG], clang, clang)
+   AC_CHECK_PROG([LLC], llc, llc)
    AC_DEFINE([HAVE_LIBELF], [1], [libelf library is present])
 else
    AC_MSG_WARN(libelf library not available)
 fi
 
+AM_CONDITIONAL([BPF_PROTOCOLS], [test x$CLANG = xclang -a x$LLC = xllc])
+
 AS_IF([test "x$x11_pkgconfig" = xyes],
       [PKG_CHECK_MODULES(GL, [gl], [gl_pkgconfig=yes], [gl_pkgconfig=no])], [gl_pkgconfig=no])
 AC_SUBST([GL_CFLAGS])

index df2b2231..90e4c8c8 100644
@@ -13,6 +13,10 @@ endif
 ir_keytable_LDADD = @LIBINTL@
 ir_keytable_LDFLAGS = $(ARGP_LIBS) $(LIBELF_LIBS)
 
+if BPF_PROTOCOLS
+SUBDIRS = bpf_protocols
+endif
+
 EXTRA_DIST = 70-infrared.rules rc_keymaps rc_keymaps_userspace gen_keytables.pl ir-keytable.1 rc_maps.cfg
 
 # custom target

new file mode 100644
index 00000000..aa748900
@@ -0,0 +1,14 @@
+
+NOSTDINC=-nostdinc -isystem $(shell $(CLANG) -print-file-name=include)
+
+%.o: %.c
+	$(CLANG) -I../../../include $(NOSTDINC) -I/usr/include -target bpf -O2 -emit-llvm -c $< -o - | $(LLC) -march=bpf -filetype=obj -o $@
+
+PROTOCOLS = grundig.o
+
+all: $(PROTOCOLS)
+
+# custom target
+install-data-local:
+	$(install_sh) -d "$(DESTDIR)$(keytableuserdir)/protocols"
+	$(install_sh) $(PROTOCOLS) "$(DESTDIR)$(keytableuserdir)/protocols"

index f7be08b3..bae31bad 100644
@@ -10,7 +10,7 @@ Source0:        http://linuxtv.org/downloads/v4l-utils/v4l-utils-%{version}.tar.
 Source1:        qv4l2.desktop
 Source2:        qv4l2.svg
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
-BuildRequires:  qt4-devel libsysfs-devel kernel-headers desktop-file-utils elfutils-libelf-devel
+BuildRequires:  qt4-devel libsysfs-devel kernel-headers desktop-file-utils elfutils-libelf-devel clang llvm
 # For /etc/udev/rules.d ownership
 Requires:       udev
 Requires:       libv4l = %{version}-%{release}

2.17.0

This commit has not made it to the list yet, I guess because it is so large.

Here it is:

https://git.linuxtv.org/syoung/v4l-utils.git/commit/?id=8e0522c73d832f086958e6cd7774a3e37bbab6bf

Hi Sean,

I did a few tests with this patch and noticed some issues:

clang didn't find asm/types.h, I'm running Debian Stretch here and asm isn't in /usr/include but in /usr/include/HOST-TRIPLET which gcc uses by default, but clang doesn't seem to know about.

With a quick workaround (adding /usr/include/x86_64-linux-gnu/ on x86_64 and /usr/include/aarch64-linux-gnu/) the grundig decoder built fine both on x86_64 and aarch64 and grundig.o files were identical. I noticed some pointer arithmetic warnings though:

hias@lepotato:~/install/v4l-utils/git/utils/keytable$ make
Making all in bpf_protocols
make[1]: Entering directory '/home/hias/install/v4l-utils/git/utils/keytable/bpf_protocols'
clang -I../../../include -nostdinc -isystem /usr/lib/llvm-3.8/bin/../lib/clang/3.8.1/include -I/usr/include -I/usr/include/aarch64-linux-gnu -target bpf -O2 -emit-llvm -c grundig.c -o - | llc -march=bpf -filetype=obj -o grundig.o
make[1]: Leaving directory '/home/hias/install/v4l-utils/git/utils/keytable/bpf_protocols'
make[1]: Entering directory '/home/hias/install/v4l-utils/git/utils/keytable'
  CC       keytable.o
  CC       ir-encode.o
  CC       toml.o
  CC       bpf.o
  CC       bpf_load.o
bpf_load.c: In function ‘parse_relo_and_apply’:
bpf_load.c:192:41: warning: pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]
     int32_t *p = (bpf_file->data->d_buf + sym.st_value);
                                         ^
bpf_load.c: In function ‘load_elf_maps_section’:
bpf_load.c:308:54: warning: pointer of type ‘void *’ used in arithmetic [-Wpointer-arith]
   def = (struct bpf_load_map_def *)(data_maps->d_buf + offset);
                                                      ^
  CCLD     ir-keytable
make[1]: Leaving directory '/home/hias/install/v4l-utils/git/utils/keytable'

When trying to load the grundig decoder (tested on aarch64 with a kernel compiled from yesterday's head of bpf-next, commit bd3a08aaa9a3) I get an "invalid mem access 'map_value_or_null'" error:

hias@lepotato:~/install/v4l-utils/git/utils/keytable$ sudo ./ir-keytable -c -w rc_keymaps_bpf/RP75_LCD.toml
bpf protocols removed
Old keytable cleared
Wrote 40 keycode(s) to driver
header_space (null)
header_pulse 1244
leader_pulse (null)
bpf_load_program() err=13
0: (bf) r6 = r1
1: (b7) r8 = 0
2: (63) *(u32 *)(r10 -4) = r8
3: (bf) r2 = r10
4: (07) r2 += -4
5: (18) r1 = 0xffff80006960fa00
7: (85) call bpf_map_lookup_elem#1
8: (bf) r7 = r10
9: (07) r7 += -24
10: (1d) if r0 == r8 goto pc+1
 R0=map_value_or_null(id=1,off=0,ks=4,vs=16,imm=0) R6=ctx(id=0,off=0,imm=0) R7=fp-24,call_-1 R8=inv0 R10=fp0,call_-1
11: (bf) r7 = r0
12: (7b) *(u64 *)(r10 -16) = r8
13: (7b) *(u64 *)(r10 -24) = r8
14: (61) r1 = *(u32 *)(r6 +0)
15: (18) r3 = 0xff000000
17: (bf) r2 = r1
18: (5f) r2 &= r3
19: (15) if r2 == 0x2000000 goto pc+131
 R0=map_value_or_null(id=1,off=0,ks=4,vs=16,imm=0) R1=inv(id=0,umax_value=4294967295,var_off=(0x0; 0xffffffff)) R2=inv(id=0,umax_value=4278190080,var_off=(0x0; 0xff000000)) R3=inv4278190080 R6=ctx(id=0,off=0,imm=0) R7=map_value_or_null(id=1,off=0,ks=4,vs=16,imm=0) R8=inv0 R10=fp0,call_-1 fp-16=0 fp-24=0
20: (57) r1 &= 16777215
21: (61) r3 = *(u32 *)(r7 +4)
R7 invalid mem access 'map_value_or_null'

Not quite sure who's to blame here, clang/llvm, the grundig code or the loader. Do you have any ideas or hints?

so long,

Hias