Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *      Driver for the MTX-1 Watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *      (C) Copyright 2005 4G Systems <info@4g-systems.biz>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *							All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *                              http://www.4g-systems.biz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *	(C) Copyright 2007 OpenWrt.org, Florian Fainelli <florian@openwrt.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *      (c) Copyright 2005    4G Systems <info@4g-systems.biz>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *      Release 0.01.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  *      Author: Michael Stickel  michael.stickel@4g-systems.biz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *      Release 0.02.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *	Author: Florian Fainelli florian@openwrt.org
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *		use the Linux watchdog/timer APIs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  *      The Watchdog is configured to reset the MTX-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  *      if it is not triggered for 100 seconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  *      It should not be triggered more often than 1.6 seconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *      A timer triggers the watchdog every 5 seconds, until
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *      it is opened for the first time. After the first open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *      it MUST be triggered every 2..95 seconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #include <asm/mach-au1x00/au1000.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #define MTX1_WDT_INTERVAL	(5 * HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static int ticks = 100 * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct completion stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	int running;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	struct timer_list timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	int queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int default_ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	unsigned long inuse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct gpio_desc *gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	unsigned int gstate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) } mtx1_wdt_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) static void mtx1_wdt_trigger(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	spin_lock(&mtx1_wdt_device.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (mtx1_wdt_device.running)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		ticks--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	/* toggle wdt gpio */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	mtx1_wdt_device.gstate = !mtx1_wdt_device.gstate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	gpiod_set_value(mtx1_wdt_device.gpiod, mtx1_wdt_device.gstate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (mtx1_wdt_device.queue && ticks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		complete(&mtx1_wdt_device.stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	spin_unlock(&mtx1_wdt_device.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static void mtx1_wdt_reset(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	ticks = mtx1_wdt_device.default_ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static void mtx1_wdt_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	spin_lock_irqsave(&mtx1_wdt_device.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (!mtx1_wdt_device.queue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		mtx1_wdt_device.queue = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		mtx1_wdt_device.gstate = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		gpiod_set_value(mtx1_wdt_device.gpiod, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 		mod_timer(&mtx1_wdt_device.timer, jiffies + MTX1_WDT_INTERVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	mtx1_wdt_device.running++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static int mtx1_wdt_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	spin_lock_irqsave(&mtx1_wdt_device.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if (mtx1_wdt_device.queue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		mtx1_wdt_device.queue = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		mtx1_wdt_device.gstate = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		gpiod_set_value(mtx1_wdt_device.gpiod, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	ticks = mtx1_wdt_device.default_ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	spin_unlock_irqrestore(&mtx1_wdt_device.lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* Filesystem functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static int mtx1_wdt_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static int mtx1_wdt_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	clear_bit(0, &mtx1_wdt_device.inuse);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static long mtx1_wdt_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 							unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	int __user *p = (int __user *)argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	unsigned int value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		.options = WDIOF_CARDRESET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		.identity = "MTX-1 WDT",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		if (copy_to_user(argp, &ident, sizeof(ident)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		put_user(0, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		if (get_user(value, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		if (value & WDIOS_ENABLECARD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			mtx1_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		else if (value & WDIOS_DISABLECARD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			mtx1_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		mtx1_wdt_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static ssize_t mtx1_wdt_write(struct file *file, const char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 						size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (!count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	mtx1_wdt_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static const struct file_operations mtx1_wdt_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	.llseek		= no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	.unlocked_ioctl	= mtx1_wdt_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	.compat_ioctl	= compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	.open		= mtx1_wdt_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	.write		= mtx1_wdt_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	.release	= mtx1_wdt_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) static struct miscdevice mtx1_wdt_misc = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	.minor	= WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	.name	= "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	.fops	= &mtx1_wdt_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static int mtx1_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	mtx1_wdt_device.gpiod = devm_gpiod_get(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 					       NULL, GPIOD_OUT_HIGH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (IS_ERR(mtx1_wdt_device.gpiod)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		dev_err(&pdev->dev, "failed to request gpio");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		return PTR_ERR(mtx1_wdt_device.gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	spin_lock_init(&mtx1_wdt_device.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	init_completion(&mtx1_wdt_device.stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	mtx1_wdt_device.queue = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	clear_bit(0, &mtx1_wdt_device.inuse);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	timer_setup(&mtx1_wdt_device.timer, mtx1_wdt_trigger, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	mtx1_wdt_device.default_ticks = ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	ret = misc_register(&mtx1_wdt_misc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		dev_err(&pdev->dev, "failed to register\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	mtx1_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	dev_info(&pdev->dev, "MTX-1 Watchdog driver\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static int mtx1_wdt_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/* FIXME: do we need to lock this test ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (mtx1_wdt_device.queue) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		mtx1_wdt_device.queue = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		wait_for_completion(&mtx1_wdt_device.stop);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	misc_deregister(&mtx1_wdt_misc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) static struct platform_driver mtx1_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	.probe = mtx1_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	.remove = mtx1_wdt_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	.driver.name = "mtx1-wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	.driver.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) module_platform_driver(mtx1_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) MODULE_AUTHOR("Michael Stickel, Florian Fainelli");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) MODULE_DESCRIPTION("Driver for the MTX-1 watchdog");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) MODULE_ALIAS("platform:mtx1-wdt");