From 5febf432df1cfa5b25d99b54c32103fafbdd0eb9 Mon Sep 17 00:00:00 2001 From: Miguel Ojeda Date: Sun, 16 Aug 2026 15:32:33 +0200 Subject: kbuild: rust: keep Rust objects out of Clang LTO with inline helpers Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit `objtool` errors such as: vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a: can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd The reason is that in such builds, the Clang invocation that compiles the combined Rust plus helpers bitcode emits LLVM bitcode (again) -- the final code generation happens in the linker's LTO step, which the `-mllvm` trap options passed to Clang do not reach. This, in turn, means that unreachable traps are missing, and the impossible paths do not merely fallthrough to the next symbol, but past the end of their own section, since LTO builds place each function in its own section. Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always emits machine code directly, with the traps in place. Assisted-by: LLM Cc: Gary Guo Cc: Boqun Feng Cc: Alice Ryhl Cc: Matthew Maurer Cc: Josh Poimboeuf Cc: Peter Zijlstra Cc: stable@vger.kernel.org Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust") Acked-by: Gary Guo Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org Signed-off-by: Miguel Ojeda --- drivers/input/joystick/grip.c | 408 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 408 insertions(+) create mode 100644 drivers/input/joystick/grip.c (limited to 'drivers/input/joystick/grip.c') diff --git a/drivers/input/joystick/grip.c b/drivers/input/joystick/grip.c new file mode 100644 index 000000000..2a3f768a7 --- /dev/null +++ b/drivers/input/joystick/grip.c @@ -0,0 +1,408 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 1998-2001 Vojtech Pavlik + */ + +/* + * Gravis/Kensington GrIP protocol joystick and gamepad driver for Linux + */ + +#include +#include +#include +#include +#include +#include + +#define DRIVER_DESC "Gravis GrIP protocol joystick driver" + +MODULE_AUTHOR("Vojtech Pavlik "); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +#define GRIP_MODE_GPP 1 +#define GRIP_MODE_BD 2 +#define GRIP_MODE_XT 3 +#define GRIP_MODE_DC 4 + +#define GRIP_LENGTH_GPP 24 +#define GRIP_STROBE_GPP 200 /* 200 us */ +#define GRIP_LENGTH_XT 4 +#define GRIP_STROBE_XT 64 /* 64 us */ +#define GRIP_MAX_CHUNKS_XT 10 +#define GRIP_MAX_BITS_XT 30 + +struct grip { + struct gameport *gameport; + struct input_dev *dev[2]; + unsigned char mode[2]; + int reads; + int bads; + char phys[2][32]; +}; + +static int grip_btn_gpp[] = { BTN_START, BTN_SELECT, BTN_TR2, BTN_Y, 0, BTN_TL2, BTN_A, BTN_B, BTN_X, 0, BTN_TL, BTN_TR, -1 }; +static int grip_btn_bd[] = { BTN_THUMB, BTN_THUMB2, BTN_TRIGGER, BTN_TOP, BTN_BASE, -1 }; +static int grip_btn_xt[] = { BTN_TRIGGER, BTN_THUMB, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_SELECT, BTN_START, BTN_MODE, -1 }; +static int grip_btn_dc[] = { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_BASE5, -1 }; + +static int grip_abs_gpp[] = { ABS_X, ABS_Y, -1 }; +static int grip_abs_bd[] = { ABS_X, ABS_Y, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 }; +static int grip_abs_xt[] = { ABS_X, ABS_Y, ABS_BRAKE, ABS_GAS, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y, -1 }; +static int grip_abs_dc[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y, -1 }; + +static char *grip_name[] = { NULL, "Gravis GamePad Pro", "Gravis Blackhawk Digital", + "Gravis Xterminator Digital", "Gravis Xterminator DualControl" }; +static int *grip_abs[] = { NULL, grip_abs_gpp, grip_abs_bd, grip_abs_xt, grip_abs_dc }; +static int *grip_btn[] = { NULL, grip_btn_gpp, grip_btn_bd, grip_btn_xt, grip_btn_dc }; +static char grip_anx[] = { 0, 0, 3, 5, 5 }; +static char grip_cen[] = { 0, 0, 2, 2, 4 }; + +/* + * grip_gpp_read_packet() reads a Gravis GamePad Pro packet. + */ + +static int grip_gpp_read_packet(struct gameport *gameport, int shift, unsigned int *data) +{ + unsigned long flags; + unsigned char u, v; + unsigned int t; + int i; + + int strobe = gameport_time(gameport, GRIP_STROBE_GPP); + + data[0] = 0; + t = strobe; + i = 0; + + local_irq_save(flags); + + v = gameport_read(gameport) >> shift; + + do { + t--; + u = v; v = (gameport_read(gameport) >> shift) & 3; + if (~v & u & 1) { + data[0] |= (v >> 1) << i++; + t = strobe; + } + } while (i < GRIP_LENGTH_GPP && t > 0); + + local_irq_restore(flags); + + if (i < GRIP_LENGTH_GPP) return -1; + + for (i = 0; i < GRIP_LENGTH_GPP && (data[0] & 0xfe4210) ^ 0x7c0000; i++) + data[0] = data[0] >> 1 | (data[0] & 1) << (GRIP_LENGTH_GPP - 1); + + return -(i == GRIP_LENGTH_GPP); +} + +/* + * grip_xt_read_packet() reads a Gravis Xterminator packet. + */ + +static int grip_xt_read_packet(struct gameport *gameport, int shift, unsigned int *data) +{ + unsigned int i, j, buf, crc; + unsigned char u, v, w; + unsigned long flags; + unsigned int t; + char status; + + int strobe = gameport_time(gameport, GRIP_STROBE_XT); + + data[0] = data[1] = data[2] = data[3] = 0; + status = buf = i = j = 0; + t = strobe; + + local_irq_save(flags); + + v = w = (gameport_read(gameport) >> shift) & 3; + + do { + t--; + u = (gameport_read(gameport) >> shift) & 3; + + if (u ^ v) { + + if ((u ^ v) & 1) { + buf = (buf << 1) | (u >> 1); + t = strobe; + i++; + } else + + if ((((u ^ v) & (v ^ w)) >> 1) & ~(u | v | w) & 1) { + if (i == 20) { + crc = buf ^ (buf >> 7) ^ (buf >> 14); + if (!((crc ^ (0x25cb9e70 >> ((crc >> 2) & 0x1c))) & 0xf)) { + data[buf >> 18] = buf >> 4; + status |= 1 << (buf >> 18); + } + j++; + } + t = strobe; + buf = 0; + i = 0; + } + w = v; + v = u; + } + + } while (status != 0xf && i < GRIP_MAX_BITS_XT && j < GRIP_MAX_CHUNKS_XT && t > 0); + + local_irq_restore(flags); + + return -(status != 0xf); +} + +/* + * grip_timer() repeatedly polls the joysticks and generates events. + */ + +static void grip_poll(struct gameport *gameport) +{ + struct grip *grip = gameport_get_drvdata(gameport); + unsigned int data[GRIP_LENGTH_XT]; + struct input_dev *dev; + int i, j; + + for (i = 0; i < 2; i++) { + + dev = grip->dev[i]; + if (!dev) + continue; + + grip->reads++; + + switch (grip->mode[i]) { + + case GRIP_MODE_GPP: + + if (grip_gpp_read_packet(grip->gameport, (i << 1) + 4, data)) { + grip->bads++; + break; + } + + input_report_abs(dev, ABS_X, ((*data >> 15) & 1) - ((*data >> 16) & 1)); + input_report_abs(dev, ABS_Y, ((*data >> 13) & 1) - ((*data >> 12) & 1)); + + for (j = 0; j < 12; j++) + if (grip_btn_gpp[j]) + input_report_key(dev, grip_btn_gpp[j], (*data >> j) & 1); + + break; + + case GRIP_MODE_BD: + + if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) { + grip->bads++; + break; + } + + input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f); + input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f)); + input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f); + + input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1)); + input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1)); + + for (j = 0; j < 5; j++) + input_report_key(dev, grip_btn_bd[j], (data[3] >> (j + 4)) & 1); + + break; + + case GRIP_MODE_XT: + + if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) { + grip->bads++; + break; + } + + input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f); + input_report_abs(dev, ABS_Y, 63 - ((data[0] >> 8) & 0x3f)); + input_report_abs(dev, ABS_BRAKE, (data[1] >> 2) & 0x3f); + input_report_abs(dev, ABS_GAS, (data[1] >> 8) & 0x3f); + input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f); + + input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1)); + input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1)); + input_report_abs(dev, ABS_HAT1X, ((data[2] >> 5) & 1) - ((data[2] >> 4) & 1)); + input_report_abs(dev, ABS_HAT1Y, ((data[2] >> 6) & 1) - ((data[2] >> 7) & 1)); + + for (j = 0; j < 11; j++) + input_report_key(dev, grip_btn_xt[j], (data[3] >> (j + 3)) & 1); + break; + + case GRIP_MODE_DC: + + if (grip_xt_read_packet(grip->gameport, (i << 1) + 4, data)) { + grip->bads++; + break; + } + + input_report_abs(dev, ABS_X, (data[0] >> 2) & 0x3f); + input_report_abs(dev, ABS_Y, (data[0] >> 8) & 0x3f); + input_report_abs(dev, ABS_RX, (data[1] >> 2) & 0x3f); + input_report_abs(dev, ABS_RY, (data[1] >> 8) & 0x3f); + input_report_abs(dev, ABS_THROTTLE, (data[2] >> 8) & 0x3f); + + input_report_abs(dev, ABS_HAT0X, ((data[2] >> 1) & 1) - ( data[2] & 1)); + input_report_abs(dev, ABS_HAT0Y, ((data[2] >> 2) & 1) - ((data[2] >> 3) & 1)); + + for (j = 0; j < 9; j++) + input_report_key(dev, grip_btn_dc[j], (data[3] >> (j + 3)) & 1); + break; + + + } + + input_sync(dev); + } +} + +static int grip_open(struct input_dev *dev) +{ + struct grip *grip = input_get_drvdata(dev); + + gameport_start_polling(grip->gameport); + return 0; +} + +static void grip_close(struct input_dev *dev) +{ + struct grip *grip = input_get_drvdata(dev); + + gameport_stop_polling(grip->gameport); +} + +static int grip_connect(struct gameport *gameport, struct gameport_driver *drv) +{ + struct grip *grip; + struct input_dev *input_dev; + unsigned int data[GRIP_LENGTH_XT]; + int i, j, t; + int err; + + grip = kzalloc_obj(*grip); + if (!grip) + return -ENOMEM; + + grip->gameport = gameport; + + gameport_set_drvdata(gameport, grip); + + err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); + if (err) + goto fail1; + + for (i = 0; i < 2; i++) { + if (!grip_gpp_read_packet(gameport, (i << 1) + 4, data)) { + grip->mode[i] = GRIP_MODE_GPP; + continue; + } + if (!grip_xt_read_packet(gameport, (i << 1) + 4, data)) { + if (!(data[3] & 7)) { + grip->mode[i] = GRIP_MODE_BD; + continue; + } + if (!(data[2] & 0xf0)) { + grip->mode[i] = GRIP_MODE_XT; + continue; + } + grip->mode[i] = GRIP_MODE_DC; + continue; + } + } + + if (!grip->mode[0] && !grip->mode[1]) { + err = -ENODEV; + goto fail2; + } + + gameport_set_poll_handler(gameport, grip_poll); + gameport_set_poll_interval(gameport, 20); + + for (i = 0; i < 2; i++) { + if (!grip->mode[i]) + continue; + + grip->dev[i] = input_dev = input_allocate_device(); + if (!input_dev) { + err = -ENOMEM; + goto fail3; + } + + snprintf(grip->phys[i], sizeof(grip->phys[i]), + "%s/input%d", gameport->phys, i); + + input_dev->name = grip_name[grip->mode[i]]; + input_dev->phys = grip->phys[i]; + input_dev->id.bustype = BUS_GAMEPORT; + input_dev->id.vendor = GAMEPORT_ID_VENDOR_GRAVIS; + input_dev->id.product = grip->mode[i]; + input_dev->id.version = 0x0100; + input_dev->dev.parent = &gameport->dev; + + input_set_drvdata(input_dev, grip); + + input_dev->open = grip_open; + input_dev->close = grip_close; + + input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); + + for (j = 0; (t = grip_abs[grip->mode[i]][j]) >= 0; j++) { + + if (j < grip_cen[grip->mode[i]]) + input_set_abs_params(input_dev, t, 14, 52, 1, 2); + else if (j < grip_anx[grip->mode[i]]) + input_set_abs_params(input_dev, t, 3, 57, 1, 0); + else + input_set_abs_params(input_dev, t, -1, 1, 0, 0); + } + + for (j = 0; (t = grip_btn[grip->mode[i]][j]) >= 0; j++) + if (t > 0) + set_bit(t, input_dev->keybit); + + err = input_register_device(grip->dev[i]); + if (err) + goto fail4; + } + + return 0; + + fail4: input_free_device(grip->dev[i]); + fail3: while (--i >= 0) + if (grip->dev[i]) + input_unregister_device(grip->dev[i]); + fail2: gameport_close(gameport); + fail1: gameport_set_drvdata(gameport, NULL); + kfree(grip); + return err; +} + +static void grip_disconnect(struct gameport *gameport) +{ + struct grip *grip = gameport_get_drvdata(gameport); + int i; + + for (i = 0; i < 2; i++) + if (grip->dev[i]) + input_unregister_device(grip->dev[i]); + gameport_close(gameport); + gameport_set_drvdata(gameport, NULL); + kfree(grip); +} + +static struct gameport_driver grip_drv = { + .driver = { + .name = "grip", + .owner = THIS_MODULE, + }, + .description = DRIVER_DESC, + .connect = grip_connect, + .disconnect = grip_disconnect, +}; + +module_gameport_driver(grip_drv); -- cgit v1.3.1