/* * SBC EPX C3 0.1 A Hardware Watchdog Device for the Winsystems EPX-C3 * single board computer * * (c) Copyright 2006 Calin A. Culianu , All Rights * Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * based on softdog.c by Alan Cox */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int epx_c3_alive; #define WATCHDOG_TIMEOUT 1 /* 1 sec default timeout */ static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); #define EPXC3_WATCHDOG_CTL_REG 0x1ee /* write 1 to enable, 0 to disable */ #define EPXC3_WATCHDOG_PET_REG 0x1ef /* write anything to pet once enabled */ static void epx_c3_start(void) { outb(1, EPXC3_WATCHDOG_CTL_REG); } static void epx_c3_stop(void) { outb(0, EPXC3_WATCHDOG_CTL_REG); pr_info("Stopped watchdog timer\n"); } static void epx_c3_pet(void) { outb(1, EPXC3_WATCHDOG_PET_REG); } /* * Allow only one person to hold it open */ static int epx_c3_open(struct inode *inode, struct file *file) { if (epx_c3_alive) return -EBUSY; if (nowayout) __module_get(THIS_MODULE); /* Activate timer */ epx_c3_start(); epx_c3_pet(); epx_c3_alive = 1; pr_info("Started watchdog timer\n"); return nonseekable_open(inode, file); } static int epx_c3_release(struct inode *inode, struct file *file) { /* Shut off the timer. * Lock it in if it's a module and we defined ...NOWAYOUT */ if (!nowayout) epx_c3_stop(); /* Turn the WDT off */ epx_c3_alive = 0; return 0; } static ssize_t epx_c3_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { /* Refresh the timer. */ if (len) epx_c3_pet(); return len; } static long epx_c3_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int options, retval = -EINVAL; int __user *argp = (void __user *)arg; static const struct watchdog_info ident = { .options = WDIOF_KEEPALIVEPING, .firmware_version = 0, .identity = "Winsystems EPX-C3 H/W Watchdog", }; switch (cmd) { case WDIOC_GETSUPPORT: if (copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; return 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: return put_user(0, argp); case WDIOC_SETOPTIONS: if (get_user(options, argp)) return -EFAULT; if (options & WDIOS_DISABLECARD) { epx_c3_stop(); retval = 0; } if (options & WDIOS_ENABLECARD) { epx_c3_start(); retval = 0; } return retval; case WDIOC_KEEPALIVE: epx_c3_pet(); return 0; case WDIOC_GETTIMEOUT: return put_user(WATCHDOG_TIMEOUT, argp); default: return -ENOTTY; } } static int epx_c3_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) epx_c3_stop(); /* Turn the WDT off */ return NOTIFY_DONE; } static const struct file_operations epx_c3_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = epx_c3_write, .unlocked_ioctl = epx_c3_ioctl, .open = epx_c3_open, .release = epx_c3_release, }; static struct miscdevice epx_c3_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &epx_c3_fops, }; static struct notifier_block epx_c3_notifier = { .notifier_call = epx_c3_notify_sys, }; static int __init watchdog_init(void) { int ret; if (!request_region(EPXC3_WATCHDOG_CTL_REG, 2, "epxc3_watchdog")) return -EBUSY; ret = register_reboot_notifier(&epx_c3_notifier); if (ret) { pr_err("cannot register reboot notifier (err=%d)\n", ret); goto out; } ret = misc_register(&epx_c3_miscdev); if (ret) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); unregister_reboot_notifier(&epx_c3_notifier); goto out; } pr_info("Hardware Watchdog Timer for Winsystems EPX-C3 SBC: 0.1\n"); return 0; out: release_region(EPXC3_WATCHDOG_CTL_REG, 2); return ret; } static void __exit watchdog_exit(void) { misc_deregister(&epx_c3_miscdev); unregister_reboot_notifier(&epx_c3_notifier); release_region(EPXC3_WATCHDOG_CTL_REG, 2); } module_init(watchdog_init); module_exit(watchdog_exit); MODULE_AUTHOR("Calin A. Culianu "); MODULE_DESCRIPTION("Hardware Watchdog Device for Winsystems EPX-C3 SBC. " "Note that there is no way to probe for this device -- " "so only use it if you are *sure* you are running on this specific " "SBC system from Winsystems! It writes to IO ports 0x1ee and 0x1ef!"); MODULE_LICENSE("GPL"); 73e937d835b09b8c885a69df50ec8 (diff)
Merge tag 'docs-4.10' of git://git.lwn.net/linuxHEADmaster
Pull documentation update from Jonathan Corbet: "These are the documentation changes for 4.10. It's another busy cycle for the docs tree, as the sphinx conversion continues. Highlights include: - Further work on PDF output, which remains a bit of a pain but should be more solid now. - Five more DocBook template files converted to Sphinx. Only 27 to go... Lots of plain-text files have also been converted and integrated. - Images in binary formats have been replaced with more source-friendly versions. - Various bits of organizational work, including the renaming of various files discussed at the kernel summit. - New documentation for the device_link mechanism. ... and, of course, lots of typo fixes and small updates" * tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits) dma-buf: Extract dma-buf.rst Update Documentation/00-INDEX docs: 00-INDEX: document directories/files with no docs docs: 00-INDEX: remove non-existing entries docs: 00-INDEX: add missing entries for documentation files/dirs docs: 00-INDEX: consolidate process/ and admin-guide/ description scripts: add a script to check if Documentation/00-INDEX is sane Docs: change sh -> awk in REPORTING-BUGS Documentation/core-api/device_link: Add initial documentation core-api: remove an unexpected unident ppc/idle: Add documentation for powersave=off Doc: Correct typo, "Introdution" => "Introduction" Documentation/atomic_ops.txt: convert to ReST markup Documentation/local_ops.txt: convert to ReST markup Documentation/assoc_array.txt: convert to ReST markup docs-rst: parse-headers.pl: cleanup the documentation docs-rst: fix media cleandocs target docs-rst: media/Makefile: reorganize the rules docs-rst: media: build SVG from graphviz files docs-rst: replace bayer.png by a SVG image ...
Diffstat (limited to 'tools/perf/ui')