From cf9610f9116d55c5a66ef9f1faecacabd93a9322 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 24 Aug 2026 08:46:03 -0700 Subject: Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "Core changes: - Use the non-blocking mux_state_try_select() in the generic MUX pin control back-end - Free pin maps on pinctrl_generic_to_map() failure in the core helpers New hardware pin control: - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC (this is for the low power audio, LPASS = Low Power Audio SubSystem portions) - Upboard support on top of the Intel pin controller - Apple T6030 and T6031 support (just compatible strings) - Samsung Exynos 8855 SoC - Mediatek MT6858 SoC - Rockchip RK3308B and RV1106 SoCs - Airoha EN7523 and AN7563 SoCs Improvements: - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable - Qualcomm improvements on top of the Qualcomm PDC (power domain controller) irqchip improvements from tglx:s tree - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups - The NPCM8xx driver has been put into shape fixing many pin and group definitions - Some non-urgent Tegra 264 pin assignments are fixed up - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and pin assignments, missing features etc" * tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits) dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema pinctrl: meson: sync some modify from A4 pinctrl: meson: a4: Add input enable pin configuration pinctrl: realtek: rtd1625: remove unused group name spdif_sel pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13 dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema Revert "Merge branch 'ib-rsk7204' into devel" pinctrl: rockchip: Add RV1106 pinctrl support dt-bindings: pinctrl: rockchip: Add RV1106 compatible pinctrl: rockchip: Decode drive strength in the get function pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable pinctrl: airoha: add support of an7563 SoC dt-bindings: pinctrl: airoha: add support of an7563 pin controller pinctrl: airoha: try to find chip scu node by phandle first pinctrl: airoha: add support of en7523 SoC dt-bindings: pinctrl: airoha: add support of en7523 pin controller pinctrl: airoha: an7583: add support for olt pinmux pinctrl: airoha: an7583: add support for pon_alt pinmux pinctrl: airoha: an7583: add support for npu_uart pinmux dt-bindings: pinctrl: airoha: an7583: add missed features ... --- drivers/tty/ttynull.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 drivers/tty/ttynull.c (limited to 'drivers/tty/ttynull.c') diff --git a/drivers/tty/ttynull.c b/drivers/tty/ttynull.c new file mode 100644 index 000000000..6b2f7208b --- /dev/null +++ b/drivers/tty/ttynull.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 Axis Communications AB + * + * Based on ttyprintk.c: + * Copyright (C) 2010 Samo Pogacnik + */ + +#include +#include +#include + +static const struct tty_port_operations ttynull_port_ops; +static struct tty_driver *ttynull_driver; +static struct tty_port ttynull_port; + +static int ttynull_open(struct tty_struct *tty, struct file *filp) +{ + return tty_port_open(&ttynull_port, tty, filp); +} + +static void ttynull_close(struct tty_struct *tty, struct file *filp) +{ + tty_port_close(&ttynull_port, tty, filp); +} + +static void ttynull_hangup(struct tty_struct *tty) +{ + tty_port_hangup(&ttynull_port); +} + +static ssize_t ttynull_write(struct tty_struct *tty, const u8 *buf, + size_t count) +{ + return count; +} + +static unsigned int ttynull_write_room(struct tty_struct *tty) +{ + return 65536; +} + +static const struct tty_operations ttynull_ops = { + .open = ttynull_open, + .close = ttynull_close, + .hangup = ttynull_hangup, + .write = ttynull_write, + .write_room = ttynull_write_room, +}; + +static struct tty_driver *ttynull_device(struct console *c, int *index) +{ + *index = 0; + return ttynull_driver; +} + +static struct console ttynull_console = { + .name = "ttynull", + .device = ttynull_device, +}; + +static int __init ttynull_init(void) +{ + struct tty_driver *driver; + int ret; + + driver = tty_alloc_driver(1, + TTY_DRIVER_RESET_TERMIOS | + TTY_DRIVER_REAL_RAW | + TTY_DRIVER_UNNUMBERED_NODE); + if (IS_ERR(driver)) + return PTR_ERR(driver); + + tty_port_init(&ttynull_port); + ttynull_port.ops = &ttynull_port_ops; + + driver->driver_name = "ttynull"; + driver->name = "ttynull"; + driver->type = TTY_DRIVER_TYPE_CONSOLE; + driver->init_termios = tty_std_termios; + driver->init_termios.c_oflag = OPOST | OCRNL | ONOCR | ONLRET; + tty_set_operations(driver, &ttynull_ops); + tty_port_link_device(&ttynull_port, driver, 0); + + ret = tty_register_driver(driver); + if (ret < 0) { + tty_driver_kref_put(driver); + tty_port_destroy(&ttynull_port); + return ret; + } + + ttynull_driver = driver; + register_console(&ttynull_console); + + return 0; +} + +static void __exit ttynull_exit(void) +{ + unregister_console(&ttynull_console); + tty_unregister_driver(ttynull_driver); + tty_driver_kref_put(ttynull_driver); + tty_port_destroy(&ttynull_port); +} + +module_init(ttynull_init); +module_exit(ttynull_exit); + +MODULE_DESCRIPTION("NULL TTY driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1