From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/media/rc/ir-sharp-decoder.c | 244 ++++++++++++++++++++++++++++++++++++ 1 file changed, 244 insertions(+) create mode 100644 drivers/media/rc/ir-sharp-decoder.c (limited to 'drivers/media/rc/ir-sharp-decoder.c') diff --git a/drivers/media/rc/ir-sharp-decoder.c b/drivers/media/rc/ir-sharp-decoder.c new file mode 100644 index 000000000..3311099cb --- /dev/null +++ b/drivers/media/rc/ir-sharp-decoder.c @@ -0,0 +1,244 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* ir-sharp-decoder.c - handle Sharp IR Pulse/Space protocol + * + * Copyright (C) 2013-2014 Imagination Technologies Ltd. + * + * Based on NEC decoder: + * Copyright (C) 2010 by Mauro Carvalho Chehab + */ + +#include +#include +#include "rc-core-priv.h" + +#define SHARP_NBITS 15 +#define SHARP_UNIT 40 /* us */ +#define SHARP_BIT_PULSE (8 * SHARP_UNIT) /* 320us */ +#define SHARP_BIT_0_PERIOD (25 * SHARP_UNIT) /* 1ms (680us space) */ +#define SHARP_BIT_1_PERIOD (50 * SHARP_UNIT) /* 2ms (1680us space) */ +#define SHARP_BIT_0_SPACE (17 * SHARP_UNIT) /* 680us space */ +#define SHARP_BIT_1_SPACE (42 * SHARP_UNIT) /* 1680us space */ +#define SHARP_ECHO_SPACE (1000 * SHARP_UNIT) /* 40 ms */ +#define SHARP_TRAILER_SPACE (125 * SHARP_UNIT) /* 5 ms (even longer) */ + +enum sharp_state { + STATE_INACTIVE, + STATE_BIT_PULSE, + STATE_BIT_SPACE, + STATE_TRAILER_PULSE, + STATE_ECHO_SPACE, + STATE_TRAILER_SPACE, +}; + +/** + * ir_sharp_decode() - Decode one Sharp 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_sharp_decode(struct rc_dev *dev, struct ir_raw_event ev) +{ + struct sharp_dec *data = &dev->raw->sharp; + u32 msg, echo, address, command, scancode; + + if (!is_timing_event(ev)) { + if (ev.overflow) + data->state = STATE_INACTIVE; + return 0; + } + + dev_dbg(&dev->dev, "Sharp 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, SHARP_BIT_PULSE, + SHARP_BIT_PULSE / 2)) + break; + + data->count = 0; + data->pulse_len = ev.duration; + data->state = STATE_BIT_SPACE; + return 0; + + case STATE_BIT_PULSE: + if (!ev.pulse) + break; + + if (!eq_margin(ev.duration, SHARP_BIT_PULSE, + SHARP_BIT_PULSE / 2)) + break; + + data->pulse_len = ev.duration; + data->state = STATE_BIT_SPACE; + return 0; + + case STATE_BIT_SPACE: + if (ev.pulse) + break; + + data->bits <<= 1; + if (eq_margin(data->pulse_len + ev.duration, SHARP_BIT_1_PERIOD, + SHARP_BIT_PULSE * 2)) + data->bits |= 1; + else if (!eq_margin(data->pulse_len + ev.duration, + SHARP_BIT_0_PERIOD, SHARP_BIT_PULSE * 2)) + break; + data->count++; + + if (data->count == SHARP_NBITS || + data->count == SHARP_NBITS * 2) + 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, SHARP_BIT_PULSE, + SHARP_BIT_PULSE / 2)) + break; + + if (data->count == SHARP_NBITS) { + /* exp,chk bits should be 1,0 */ + if ((data->bits & 0x3) != 0x2 && + /* DENON variant, both chk bits 0 */ + (data->bits & 0x3) != 0x0) + break; + data->state = STATE_ECHO_SPACE; + } else { + data->state = STATE_TRAILER_SPACE; + } + return 0; + + case STATE_ECHO_SPACE: + if (ev.pulse) + break; + + if (!eq_margin(ev.duration, SHARP_ECHO_SPACE, + SHARP_ECHO_SPACE / 4)) + break; + + data->state = STATE_BIT_PULSE; + + return 0; + + case STATE_TRAILER_SPACE: + if (ev.pulse) + break; + + if (!geq_margin(ev.duration, SHARP_TRAILER_SPACE, + SHARP_BIT_PULSE / 2)) + break; + + /* Validate - command, ext, chk should be inverted in 2nd */ + msg = (data->bits >> 15) & 0x7fff; + echo = data->bits & 0x7fff; + if ((msg ^ echo) != 0x3ff) { + dev_dbg(&dev->dev, + "Sharp checksum error: received 0x%04x, 0x%04x\n", + msg, echo); + break; + } + + address = bitrev8((msg >> 7) & 0xf8); + command = bitrev8((msg >> 2) & 0xff); + + scancode = address << 8 | command; + dev_dbg(&dev->dev, "Sharp scancode 0x%04x\n", scancode); + + rc_keydown(dev, RC_PROTO_SHARP, scancode, 0); + data->state = STATE_INACTIVE; + return 0; + } + + dev_dbg(&dev->dev, "Sharp 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_sharp_timings = { + .header_pulse = 0, + .header_space = 0, + .bit_pulse = SHARP_BIT_PULSE, + .bit_space[0] = SHARP_BIT_0_SPACE, + .bit_space[1] = SHARP_BIT_1_SPACE, + .trailer_pulse = SHARP_BIT_PULSE, + .trailer_space = SHARP_ECHO_SPACE, + .msb_first = 1, +}; + +/** + * ir_sharp_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_sharp_encode(enum rc_proto protocol, u32 scancode, + struct ir_raw_event *events, unsigned int max) +{ + struct ir_raw_event *e = events; + int ret; + u32 raw; + + raw = (((bitrev8(scancode >> 8) >> 3) << 8) & 0x1f00) | + bitrev8(scancode); + ret = ir_raw_gen_pd(&e, max, &ir_sharp_timings, SHARP_NBITS, + (raw << 2) | 2); + if (ret < 0) + return ret; + + max -= ret; + + raw = (((bitrev8(scancode >> 8) >> 3) << 8) & 0x1f00) | + bitrev8(~scancode); + ret = ir_raw_gen_pd(&e, max, &ir_sharp_timings, SHARP_NBITS, + (raw << 2) | 1); + if (ret < 0) + return ret; + + return e - events; +} + +static struct ir_raw_handler sharp_handler = { + .protocols = RC_PROTO_BIT_SHARP, + .decode = ir_sharp_decode, + .encode = ir_sharp_encode, + .carrier = 38000, + .min_timeout = SHARP_ECHO_SPACE + SHARP_ECHO_SPACE / 4, +}; + +static int __init ir_sharp_decode_init(void) +{ + ir_raw_handler_register(&sharp_handler); + + pr_info("IR Sharp protocol handler initialized\n"); + return 0; +} + +static void __exit ir_sharp_decode_exit(void) +{ + ir_raw_handler_unregister(&sharp_handler); +} + +module_init(ir_sharp_decode_init); +module_exit(ir_sharp_decode_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("James Hogan "); +MODULE_DESCRIPTION("Sharp IR protocol decoder"); -- cgit v1.3.1