On Tue, Dec 04, 2018 at 09:20:25PM +0100, patrick9876@xxxxxxx wrote: > From: Patrick LERDA <patrick9876@xxxxxxx> > > --- > drivers/media/rc/Kconfig | 10 ++ > drivers/media/rc/Makefile | 1 + > drivers/media/rc/ir-rcmm-decoder.c | 185 +++++++++++++++++++++++++++++ > drivers/media/rc/rc-core-priv.h | 5 + > drivers/media/rc/rc-main.c | 3 + > include/media/rc-map.h | 6 +- > include/uapi/linux/lirc.h | 1 + > tools/include/uapi/linux/lirc.h | 1 + > 8 files changed, 210 insertions(+), 2 deletions(-) > create mode 100644 drivers/media/rc/ir-rcmm-decoder.c We have a rc-mm decoder written in BPF, see: https://git.linuxtv.org/v4l-utils.git/tree/utils/keytable/bpf_protocols/rc_mm.c This is in v4l-utils 1.16 and higher. Any reason to have it in the kernel rather than in BPF? Sean > > diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig > index 1021c08a9ba4..b7e08324b874 100644 > --- a/drivers/media/rc/Kconfig > +++ b/drivers/media/rc/Kconfig > @@ -133,6 +133,16 @@ config IR_IMON_DECODER > remote control and you would like to use it with a raw IR > receiver, or if you wish to use an encoder to transmit this IR. > > +config IR_RCMM_DECODER > + tristate "Enable IR raw decoder for the RC-MM protocol" > + depends on RC_CORE > + select BITREVERSE > + default y > + > + ---help--- > + Enable this option if you have IR with RC-MM protocol, and > + if the IR is decoded in software > + > endif #RC_DECODERS > > menuconfig RC_DEVICES > diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile > index e0340d043fe8..fc4058013234 100644 > --- a/drivers/media/rc/Makefile > +++ b/drivers/media/rc/Makefile > @@ -16,6 +16,7 @@ obj-$(CONFIG_IR_SHARP_DECODER) += ir-sharp-decoder.o > obj-$(CONFIG_IR_MCE_KBD_DECODER) += ir-mce_kbd-decoder.o > obj-$(CONFIG_IR_XMP_DECODER) += ir-xmp-decoder.o > obj-$(CONFIG_IR_IMON_DECODER) += ir-imon-decoder.o > +obj-$(CONFIG_IR_RCMM_DECODER) += ir-rcmm-decoder.o > > # stand-alone IR receivers/transmitters > obj-$(CONFIG_RC_ATI_REMOTE) += ati_remote.o > diff --git a/drivers/media/rc/ir-rcmm-decoder.c b/drivers/media/rc/ir-rcmm-decoder.c > new file mode 100644 > index 000000000000..b05063f0a552 > --- /dev/null > +++ b/drivers/media/rc/ir-rcmm-decoder.c > @@ -0,0 +1,185 @@ > +/* ir-rcmm-decoder.c - A decoder for the RCMM IR protocol > + * > + * Copyright (C) 2016 by Patrick Lerda > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation version 2 of the License. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include "rc-core-priv.h" > +#include <linux/module.h> > +#include <linux/version.h> > + > + > +#define RCMM_UNIT 166667 /* nanosecs */ > +#define RCMM_0_NBITS 64 > +#define RCMM_PREFIX_PULSE 416666 /* 166666.666666666*2.5 */ > +#define RCMM_PULSE_0 277777 /* 166666.666666666*(1+2/3) */ > +#define RCMM_PULSE_1 444444 /* 166666.666666666*(2+2/3) */ > +#define RCMM_PULSE_2 611111 /* 166666.666666666*(3+2/3) */ > +#define RCMM_PULSE_3 777778 /* 166666.666666666*(4+2/3) */ > +#define RCMM_MODE_MASK 0x0000 > + > +enum rcmm_state { > + STATE_INACTIVE, > + STATE_LOW, > + STATE_BUMP, > + STATE_VALUE, > + STATE_FINISHED, > +}; > + > +static bool rcmm_mode(struct rcmm_dec *data) > +{ > + return !((0x000c0000 & data->bits) == 0x000c0000); > +} > + > +/** > + * ir_rcmm_decode() - Decode one RCMM pulse or space > + * @dev: the struct rc_dev descriptor of the device > + * @ev: the struct ir_raw_event descriptor of the pulse/space > + * > + * This function returns -EINVAL if the pulse violates the state machine > + */ > +static int ir_rcmm_decode(struct rc_dev *dev, struct ir_raw_event ev) > +{ > + struct rcmm_dec *data = &dev->raw->rcmm; > + u32 scancode; > + u8 toggle; > + > + if (!(dev->enabled_protocols & RC_PROTO_RCMM)) > + return 0; > + > + if (!is_timing_event(ev)) { > + if (ev.reset) > + data->state = STATE_INACTIVE; > + return 0; > + } > + > + if (ev.duration > RCMM_PULSE_3 + RCMM_UNIT) > + goto out; > + > + switch (data->state) { > + > + case STATE_INACTIVE: > + if (!ev.pulse) > + break; > + > + /* Note: larger margin on first pulse since each RCMM_UNIT > + is quite short and some hardware takes some time to > + adjust to the signal */ > + if (!eq_margin(ev.duration, RCMM_PREFIX_PULSE, RCMM_UNIT/2)) > + break; > + > + data->state = STATE_LOW; > + data->count = 0; > + data->bits = 0; > + return 0; > + > + case STATE_LOW: > + if (ev.pulse) > + break; > + > + /* Note: larger margin on first pulse since each RCMM_UNIT > + is quite short and some hardware takes some time to > + adjust to the signal */ > + if (!eq_margin(ev.duration, RCMM_PULSE_0, RCMM_UNIT/2)) > + break; > + > + data->state = STATE_BUMP; > + return 0; > + > + case STATE_BUMP: > + if (!ev.pulse) > + break; > + > + if (!eq_margin(ev.duration, RCMM_UNIT, RCMM_UNIT / 2)) > + break; > + > + data->state = STATE_VALUE; > + return 0; > + > + case STATE_VALUE: > + if (ev.pulse) > + break; > + { > + int value; > + > + if (eq_margin(ev.duration, RCMM_PULSE_0, RCMM_UNIT / 2)) { > + value = 0; > + } else if (eq_margin(ev.duration, RCMM_PULSE_1, RCMM_UNIT / 2)) { > + value = 1; > + } else if (eq_margin(ev.duration, RCMM_PULSE_2, RCMM_UNIT / 2)) { > + value = 2; > + } else if (eq_margin(ev.duration, RCMM_PULSE_3, RCMM_UNIT / 2)) { > + value = 3; > + } else > + break; > + > + data->bits <<= 2; > + data->bits |= value; > + } > + > + data->count+=2; > + > + if (data->count < 32) { > + data->state = STATE_BUMP; > + } else { > + data->state = STATE_FINISHED; > + } > + > + return 0; > + > + case STATE_FINISHED: > + if (!ev.pulse) break; > + > + if (!eq_margin(ev.duration, RCMM_UNIT, RCMM_UNIT / 2)) > + break; > + > + if (rcmm_mode(data)) { > + toggle = !!(0x8000 & data->bits); > + scancode = data->bits & ~0x8000; > + } else { > + toggle = 0; > + scancode = data->bits; > + } > + > + rc_keydown(dev, RC_PROTO_RCMM, scancode, toggle); > + data->state = STATE_INACTIVE; > + return 0; > + } > + > +out: > + data->state = STATE_INACTIVE; > + return -EINVAL; > +} > + > +static struct ir_raw_handler rcmm_handler = { > + .protocols = RC_PROTO_RCMM, > + .decode = ir_rcmm_decode, > +}; > + > +static int __init ir_rcmm_decode_init(void) > +{ > + ir_raw_handler_register(&rcmm_handler); > + > + printk(KERN_INFO "IR RCMM protocol handler initialized\n"); > + return 0; > +} > + > +static void __exit ir_rcmm_decode_exit(void) > +{ > + ir_raw_handler_unregister(&rcmm_handler); > +} > + > +module_init(ir_rcmm_decode_init); > +module_exit(ir_rcmm_decode_exit); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Patrick LERDA"); > +MODULE_DESCRIPTION("RCMM IR protocol decoder"); > diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h > index c2cbe7f6266c..c63d4ad007cc 100644 > --- a/drivers/media/rc/rc-core-priv.h > +++ b/drivers/media/rc/rc-core-priv.h > @@ -131,6 +131,11 @@ struct ir_raw_event_ctrl { > unsigned int bits; > bool stick_keyboard; > } imon; > + struct rcmm_dec { > + int state; > + unsigned count; > + u64 bits; > + } rcmm; > }; > > /* Mutex for locking raw IR processing and handler change */ > diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c > index 552bbe82a160..ad1dee921f5b 100644 > --- a/drivers/media/rc/rc-main.c > +++ b/drivers/media/rc/rc-main.c > @@ -70,6 +70,8 @@ static const struct { > [RC_PROTO_CEC] = { .name = "cec", .repeat_period = 0 }, > [RC_PROTO_IMON] = { .name = "imon", > .scancode_bits = 0x7fffffff, .repeat_period = 114 }, > + [RC_PROTO_RCMM] = { .name = "rcmm", > + .scancode_bits = 0xffffffff, .repeat_period = 114 }, > }; > > /* Used to keep track of known keymaps */ > @@ -1004,6 +1006,7 @@ static const struct { > { RC_PROTO_BIT_XMP, "xmp", "ir-xmp-decoder" }, > { RC_PROTO_BIT_CEC, "cec", NULL }, > { RC_PROTO_BIT_IMON, "imon", "ir-imon-decoder" }, > + { RC_PROTO_BIT_RCMM, "rcmm", "ir-rcmm-decoder" }, > }; > > /** > diff --git a/include/media/rc-map.h b/include/media/rc-map.h > index bfa3017cecba..28e8e7692b38 100644 > --- a/include/media/rc-map.h > +++ b/include/media/rc-map.h > @@ -37,6 +37,7 @@ > #define RC_PROTO_BIT_XMP BIT_ULL(RC_PROTO_XMP) > #define RC_PROTO_BIT_CEC BIT_ULL(RC_PROTO_CEC) > #define RC_PROTO_BIT_IMON BIT_ULL(RC_PROTO_IMON) > +#define RC_PROTO_BIT_RCMM BIT_ULL(RC_PROTO_RCMM) > > #define RC_PROTO_BIT_ALL \ > (RC_PROTO_BIT_UNKNOWN | RC_PROTO_BIT_OTHER | \ > @@ -51,7 +52,7 @@ > RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 | \ > RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \ > RC_PROTO_BIT_XMP | RC_PROTO_BIT_CEC | \ > - RC_PROTO_BIT_IMON) > + RC_PROTO_BIT_IMON | RC_PROTO_BIT_RCMM) > /* All rc protocols for which we have decoders */ > #define RC_PROTO_BIT_ALL_IR_DECODER \ > (RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \ > @@ -64,7 +65,8 @@ > RC_PROTO_BIT_RC6_0 | RC_PROTO_BIT_RC6_6A_20 | \ > RC_PROTO_BIT_RC6_6A_24 | RC_PROTO_BIT_RC6_6A_32 | \ > RC_PROTO_BIT_RC6_MCE | RC_PROTO_BIT_SHARP | \ > - RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON) > + RC_PROTO_BIT_XMP | RC_PROTO_BIT_IMON | \ > + RC_PROTO_RCMM) > > #define RC_PROTO_BIT_ALL_IR_ENCODER \ > (RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC5X_20 | \ > diff --git a/include/uapi/linux/lirc.h b/include/uapi/linux/lirc.h > index 6b319581882f..2bc7915ff33a 100644 > --- a/include/uapi/linux/lirc.h > +++ b/include/uapi/linux/lirc.h > @@ -218,6 +218,7 @@ enum rc_proto { > RC_PROTO_XMP = 21, > RC_PROTO_CEC = 22, > RC_PROTO_IMON = 23, > + RC_PROTO_RCMM = 24, > }; > > #endif > diff --git a/tools/include/uapi/linux/lirc.h b/tools/include/uapi/linux/lirc.h > index f189931042a7..c03e9562e349 100644 > --- a/tools/include/uapi/linux/lirc.h > +++ b/tools/include/uapi/linux/lirc.h > @@ -212,6 +212,7 @@ enum rc_proto { > RC_PROTO_XMP = 21, > RC_PROTO_CEC = 22, > RC_PROTO_IMON = 23, > + RC_PROTO_RCMM = 24, > }; > > #endif > -- > 2.19.2
