diff options
Diffstat (limited to 'drivers/media/rc/ir-sanyo-decoder.c')
| -rw-r--r-- | drivers/media/rc/ir-sanyo-decoder.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/media/rc/ir-sanyo-decoder.c b/drivers/media/rc/ir-sanyo-decoder.c new file mode 100644 index 0000000000..2bc98c3428 --- /dev/null +++ b/drivers/media/rc/ir-sanyo-decoder.c @@ -0,0 +1,235 @@ +// SPDX-License-Identifier: GPL-2.0 +// ir-sanyo-decoder.c - handle SANYO IR Pulse/Space protocol +// +// Copyright (C) 2011 by Mauro Carvalho Chehab +// +// This protocol uses the NEC protocol timings. However, data is formatted as: +// 13 bits Custom Code +// 13 bits NOT(Custom Code) +// 8 bits Key data +// 8 bits NOT(Key data) +// +// According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon +// Information for this protocol is available at the Sanyo LC7461 datasheet. + +#include <linux/module.h> +#include <linux/bitrev.h> +#include "rc-core-priv.h" + +#define SANYO_NBITS (13+13+8+8) +#define SANYO_UNIT 563 /* us */ +#define SANYO_HEADER_PULSE (16 * SANYO_UNIT) +#define SANYO_HEADER_SPACE (8 * SANYO_UNIT) +#define SANYO_BIT_PULSE (1 * SANYO_UNIT) +#define SANYO_BIT_0_SPACE (1 * SANYO_UNIT) +#define SANYO_BIT_1_SPACE (3 * SANYO_UNIT) +#define SANYO_REPEAT_SPACE (150 * SANYO_UNIT) +#define SANYO_TRAILER_PULSE (1 * SANYO_UNIT) +#define SANYO_TRAILER_SPACE (10 * SANYO_UNIT) /* in fact, 42 */ + +enum sanyo_state { + STATE_INACTIVE, + STATE_HEADER_SPACE, + STATE_BIT_PULSE, + STATE_BIT_SPACE, + STATE_TRAILER_PULSE, + STATE_TRAILER_SPACE, +}; + +/** + * ir_sanyo_decode() - Decode one SANYO 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_sanyo_decode(struct rc_dev *dev, struct ir_raw_event ev) +{ + struct sanyo_dec *data = &dev->raw->sanyo; + u32 scancode; + u16 address; + u8 command, not_command; + + if (!is_timing_event(ev)) { + if (ev.overflow) { + dev_dbg(&dev->dev, "SANYO event overflow received. reset to state 0\n"); + data->state = STATE_INACTIVE; + } + return 0; + } + + dev_dbg(&dev->dev, "SANYO decode started at state %d (%uus %s)\n", + data->state, ev.duration, TO_STR(ev.pulse)); + + switch (data->state) { + + case STATE_INACTIVE: + if (!ev.pulse) + break; + + if (eq_margin(ev.duration, SANYO_HEADER_PULSE, SANYO_UNIT / 2)) { + data->count = 0; + data->state = STATE_HEADER_SPACE; + return 0; + } + break; + + + case STATE_HEADER_SPACE: + if (ev.pulse) + break; + + if (eq_margin(ev.duration, SANYO_HEADER_SPACE, SANYO_UNIT / 2)) { + data->state = STATE_BIT_PULSE; + return 0; + } + + break; + + case STATE_BIT_PULSE: + if (!ev.pulse) + break; + + if (!eq_margin(ev.duration, SANYO_BIT_PULSE, SANYO_UNIT / 2)) + break; + + data->state = STATE_BIT_SPACE; + return 0; + + case STATE_BIT_SPACE: + if (ev.pulse) + break; + + if (!data->count && geq_margin(ev.duration, SANYO_REPEAT_SPACE, SANYO_UNIT / 2)) { + rc_repeat(dev); + dev_dbg(&dev->dev, "SANYO repeat last key\n"); + data->state = STATE_INACTIVE; + return 0; + } + + data->bits <<= 1; + if (eq_margin(ev.duration, SANYO_BIT_1_SPACE, SANYO_UNIT / 2)) + data->bits |= 1; + else if (!eq_margin(ev.duration, SANYO_BIT_0_SPACE, SANYO_UNIT / 2)) + break; + data->count++; + + if (data->count == SANYO_NBITS) + data->state = STATE_TRAILER_PULSE; + else + data->state = STATE_BIT_PULSE; + + return 0; + + case STATE_TRAILER_PULSE: + if (!ev.pulse) + break; + + if (!eq_margin(ev.duration, SANYO_TRAILER_PULSE, SANYO_UNIT / 2)) + break; + + data->state = STATE_TRAILER_SPACE; + return 0; + + case STATE_TRAILER_SPACE: + if (ev.pulse) + break; + + if (!geq_margin(ev.duration, SANYO_TRAILER_SPACE, SANYO_UNIT / 2)) + break; + + address = bitrev16((data->bits >> 29) & 0x1fff) >> 3; + /* not_address = bitrev16((data->bits >> 16) & 0x1fff) >> 3; */ + command = bitrev8((data->bits >> 8) & 0xff); + not_command = bitrev8((data->bits >> 0) & 0xff); + + if ((command ^ not_command) != 0xff) { + dev_dbg(&dev->dev, "SANYO checksum error: received 0x%08llx\n", + data->bits); + data->state = STATE_INACTIVE; + return 0; + } + + scancode = address << 8 | command; + dev_dbg(&dev->dev, "SANYO scancode: 0x%06x\n", scancode); + rc_keydown(dev, RC_PROTO_SANYO, scancode, 0); + data->state = STATE_INACTIVE; + return 0; + } + + dev_dbg(&dev->dev, "SANYO decode failed at count %d state %d (%uus %s)\n", + data->count, data->state, ev.duration, TO_STR(ev.pulse)); + data->state = STATE_INACTIVE; + return -EINVAL; +} + +static const struct ir_raw_timings_pd ir_sanyo_timings = { + .header_pulse = SANYO_HEADER_PULSE, + .header_space = SANYO_HEADER_SPACE, + .bit_pulse = SANYO_BIT_PULSE, + .bit_space[0] = SANYO_BIT_0_SPACE, + .bit_space[1] = SANYO_BIT_1_SPACE, + .trailer_pulse = SANYO_TRAILER_PULSE, + .trailer_space = SANYO_TRAILER_SPACE, + .msb_first = 1, +}; + +/** + * ir_sanyo_encode() - Encode a scancode as a stream of raw events + * + * @protocol: protocol to encode + * @scancode: scancode to encode + * @events: array of raw ir events to write into + * @max: maximum size of @events + * + * Returns: The number of events written. + * -ENOBUFS if there isn't enough space in the array to fit the + * encoding. In this case all @max events will have been written. + */ +static int ir_sanyo_encode(enum rc_proto protocol, u32 scancode, + struct ir_raw_event *events, unsigned int max) +{ + struct ir_raw_event *e = events; + int ret; + u64 raw; + + raw = ((u64)(bitrev16(scancode >> 8) & 0xfff8) << (8 + 8 + 13 - 3)) | + ((u64)(bitrev16(~scancode >> 8) & 0xfff8) << (8 + 8 + 0 - 3)) | + ((bitrev8(scancode) & 0xff) << 8) | + (bitrev8(~scancode) & 0xff); + + ret = ir_raw_gen_pd(&e, max, &ir_sanyo_timings, SANYO_NBITS, raw); + if (ret < 0) + return ret; + + return e - events; +} + +static struct ir_raw_handler sanyo_handler = { + .protocols = RC_PROTO_BIT_SANYO, + .decode = ir_sanyo_decode, + .encode = ir_sanyo_encode, + .carrier = 38000, + .min_timeout = SANYO_TRAILER_SPACE, +}; + +static int __init ir_sanyo_decode_init(void) +{ + ir_raw_handler_register(&sanyo_handler); + + printk(KERN_INFO "IR SANYO protocol handler initialized\n"); + return 0; +} + +static void __exit ir_sanyo_decode_exit(void) +{ + ir_raw_handler_unregister(&sanyo_handler); +} + +module_init(ir_sanyo_decode_init); +module_exit(ir_sanyo_decode_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Mauro Carvalho Chehab"); +MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); +MODULE_DESCRIPTION("SANYO IR protocol decoder"); |