/* * Watchdog driver for SBC-FITPC2 board * * Author: Denis Turischev * * Adapted from the IXP2000 watchdog driver by Deepak Saxena. * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #define pr_fmt(fmt) KBUILD_MODNAME " WATCHDOG: " fmt #include #include #include #include #include #include #include #include #include #include #include #include static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int margin = 60; /* (secs) Default is 1 minute */ static unsigned long wdt_status; static DEFINE_MUTEX(wdt_lock); #define WDT_IN_USE 0 #define WDT_OK_TO_CLOSE 1 #define COMMAND_PORT 0x4c #define DATA_PORT 0x48 #define IFACE_ON_COMMAND 1 #define REBOOT_COMMAND 2 #define WATCHDOG_NAME "SBC-FITPC2 Watchdog" static void wdt_send_data(unsigned char command, unsigned char data) { outb(data, DATA_PORT); msleep(200); outb(command, COMMAND_PORT); msleep(100); } static void wdt_enable(void) { mutex_lock(&wdt_lock); wdt_send_data(IFACE_ON_COMMAND, 1); wdt_send_data(REBOOT_COMMAND, margin); mutex_unlock(&wdt_lock); } static void wdt_disable(void) { mutex_lock(&wdt_lock); wdt_send_data(IFACE_ON_COMMAND, 0); wdt_send_data(REBOOT_COMMAND, 0); mutex_unlock(&wdt_lock); } static int fitpc2_wdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(WDT_IN_USE, &wdt_status)) return -EBUSY; clear_bit(WDT_OK_TO_CLOSE, &wdt_status); wdt_enable(); return nonseekable_open(inode, file); } static ssize_t fitpc2_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) { size_t i; if (!len) return 0; if (nowayout) { len = 0; goto out; } clear_bit(WDT_OK_TO_CLOSE, &wdt_status); for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') set_bit(WDT_OK_TO_CLOSE, &wdt_status); } out: wdt_enable(); return len; } static const struct watchdog_info ident = { .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, .identity = WATCHDOG_NAME, }; static long fitpc2_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int ret = -ENOTTY; int time; switch (cmd) { case WDIOC_GETSUPPORT: ret = copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident)) ? -EFAULT : 0; break; case WDIOC_GETSTATUS: ret = put_user(0, (int *)arg); break; case WDIOC_GETBOOTSTATUS: ret = put_user(0, (int *)arg); break; case WDIOC_KEEPALIVE: wdt_enable(); ret = 0; break; case WDIOC_SETTIMEOUT: ret = get_user(time, (int *)arg); if (ret) break; if (time < 31 || time > 255) { ret = -EINVAL; break; } margin = time; wdt_enable(); /* Fall through */ case WDIOC_GETTIMEOUT: ret = put_user(margin, (int *)arg); break; } return ret; } static int fitpc2_wdt_release(struct inode *inode, struct file *file) { if (test_bit(WDT_OK_TO_CLOSE, &wdt_status)) { wdt_disable(); pr_info("Device disabled\n"); } else { pr_warn("Device closed unexpectedly - timer will not stop\n"); wdt_enable(); } clear_bit(WDT_IN_USE, &wdt_status); clear_bit(WDT_OK_TO_CLOSE, &wdt_status); return 0; } static const struct file_operations fitpc2_wdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = fitpc2_wdt_write, .unlocked_ioctl = fitpc2_wdt_ioctl, .open = fitpc2_wdt_open, .release = fitpc2_wdt_release, }; static struct miscdevice fitpc2_wdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &fitpc2_wdt_fops, }; static int __init fitpc2_wdt_init(void) { int err; const char *brd_name; brd_name = dmi_get_system_info(DMI_BOARD_NAME); if (!brd_name || !strstr(brd_name, "SBC-FITPC2")) return -ENODEV; pr_info("%s found\n", brd_name); if (!request_region(COMMAND_PORT, 1, WATCHDOG_NAME)) { pr_err("I/O address 0x%04x already in use\n", COMMAND_PORT); return -EIO; } if (!request_region(DATA_PORT, 1, WATCHDOG_NAME)) { pr_err("I/O address 0x%04x already in use\n", DATA_PORT); err = -EIO; goto err_data_port; } if (margin < 31 || margin > 255) { pr_err("margin must be in range 31 - 255 seconds, you tried to set %d\n", margin); err = -EINVAL; goto err_margin; } err = misc_register(&fitpc2_wdt_miscdev); if (err) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, err); goto err_margin; } return 0; err_margin: release_region(DATA_PORT, 1); err_data_port: release_region(COMMAND_PORT, 1); return err; } static void __exit fitpc2_wdt_exit(void) { misc_deregister(&fitpc2_wdt_miscdev); release_region(DATA_PORT, 1); release_region(COMMAND_PORT, 1); } module_init(fitpc2_wdt_init); module_exit(fitpc2_wdt_exit); MODULE_AUTHOR("Denis Turischev "); MODULE_DESCRIPTION("SBC-FITPC2 Watchdog"); module_param(margin, int, 0); MODULE_PARM_DESC(margin, "Watchdog margin in seconds (default 60s)"); module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started"); MODULE_LICENSE("GPL"); tr>commit238d1d0f79f619d75c2cc741d6770fb0986aef24 (patch) treeed11bb89c3c61cba7aff3ebc90647f83758a982d /sound/soc/codecs/tas5720.c parentf3de082c12e5e9ff43c58a7561f6ec3272d03a48 (diff)parent36f671be1db1b17d3d4ab0c8b47f81ccb1efcb75 (diff)
Merge tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux
Pull documentation fixes from Jonathan Corbet: "Two small fixes: - A merge error on my part broke the DocBook build. I've requisitioned one of tglx's frozen sharks for appropriate disciplinary action and resolved to be more careful about testing the DocBook stuff as long as it's still around. - Fix an error in unaligned-memory-access.txt" * tag 'docs-4.10-rc1-fix' of git://git.lwn.net/linux: Documentation/unaligned-memory-access.txt: fix incorrect comparison operator docs: Fix build failure
Diffstat (limited to 'sound/soc/codecs/tas5720.c')