diff options
Diffstat (limited to 'kernel/printk/conopt.c')
-rw-r--r-- | kernel/printk/conopt.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/kernel/printk/conopt.c b/kernel/printk/conopt.c deleted file mode 100644 index 9d507bac3657..000000000000 --- a/kernel/printk/conopt.c +++ /dev/null @@ -1,146 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Kernel command line console options for hardware based addressing - * - * Copyright (C) 2023 Texas Instruments Incorporated - https://www.ti.com/ - * Author: Tony Lindgren <tony@atomide.com> - */ - -#include <linux/console.h> -#include <linux/init.h> -#include <linux/string.h> -#include <linux/types.h> - -#include <asm/errno.h> - -#include "console_cmdline.h" - -/* - * Allow longer DEVNAME:0.0 style console naming such as abcd0000.serial:0.0 - * in addition to the legacy ttyS0 style naming. - */ -#define CONSOLE_NAME_MAX 32 - -#define CONSOLE_OPT_MAX 16 -#define CONSOLE_BRL_OPT_MAX 16 - -struct console_option { - char name[CONSOLE_NAME_MAX]; - char opt[CONSOLE_OPT_MAX]; - char brl_opt[CONSOLE_BRL_OPT_MAX]; - u8 has_brl_opt:1; -}; - -/* Updated only at console_setup() time, no locking needed */ -static struct console_option conopt[MAX_CMDLINECONSOLES]; - -/** - * console_opt_save - Saves kernel command line console option for driver use - * @str: Kernel command line console name and option - * @brl_opt: Braille console options - * - * Saves a kernel command line console option for driver subsystems to use for - * adding a preferred console during init. Called from console_setup() only. - * - * Return: 0 on success, negative error code on failure. - */ -int __init console_opt_save(const char *str, const char *brl_opt) -{ - struct console_option *con; - size_t namelen, optlen; - const char *opt; - int i; - - namelen = strcspn(str, ","); - if (namelen == 0 || namelen >= CONSOLE_NAME_MAX) - return -EINVAL; - - opt = str + namelen; - if (*opt == ',') - opt++; - - optlen = strlen(opt); - if (optlen >= CONSOLE_OPT_MAX) - return -EINVAL; - - for (i = 0; i < MAX_CMDLINECONSOLES; i++) { - con = &conopt[i]; - - if (con->name[0]) { - if (!strncmp(str, con->name, namelen)) - return 0; - continue; - } - - /* - * The name isn't terminated, only opt is. Empty opt is fine, - * but brl_opt can be either empty or NULL. For more info, see - * _braille_console_setup(). - */ - strscpy(con->name, str, namelen + 1); - strscpy(con->opt, opt, CONSOLE_OPT_MAX); - if (brl_opt) { - strscpy(con->brl_opt, brl_opt, CONSOLE_BRL_OPT_MAX); - con->has_brl_opt = 1; - } - - return 0; - } - - return -ENOMEM; -} - -static struct console_option *console_opt_find(const char *name) -{ - struct console_option *con; - int i; - - for (i = 0; i < MAX_CMDLINECONSOLES; i++) { - con = &conopt[i]; - if (!strcmp(name, con->name)) - return con; - } - - return NULL; -} - -/** - * add_preferred_console_match - Adds a preferred console if a match is found - * @match: Expected console on kernel command line, such as console=DEVNAME:0.0 - * @name: Name of the console character device to add such as ttyS - * @idx: Index for the console - * - * Allows driver subsystems to add a console after translating the command - * line name to the character device name used for the console. Options are - * added automatically based on the kernel command line. Duplicate preferred - * consoles are ignored by __add_preferred_console(). - * - * Return: 0 on success, negative error code on failure. - */ -int add_preferred_console_match(const char *match, const char *name, - const short idx) -{ - struct console_option *con; - char *brl_opt = NULL; - - if (!match || !strlen(match) || !name || !strlen(name) || - idx < 0) - return -EINVAL; - - con = console_opt_find(match); - if (!con) - return -ENOENT; - - /* - * See __add_preferred_console(). It checks for NULL brl_options to set - * the preferred_console flag. Empty brl_opt instead of NULL leads into - * the preferred_console flag not set, and CON_CONSDEV not being set, - * and the boot console won't get disabled at the end of console_setup(). - */ - if (con->has_brl_opt) - brl_opt = con->brl_opt; - - console_opt_add_preferred_console(name, idx, con->opt, brl_opt); - - return 0; -} |