1 // SPDX-License-Identifier: GPL-2.0+
3  *	Berkshire USB-PC Watchdog Card Driver
5  *	(c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>.
12  *	  Greg Kroah-Hartman <greg@kroah.com>
16  *	provided "AS-IS" and at no charge.
28 #include <linux/errno.h>	/* For the -ENODEV/... values */
47 #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
55 						delay-time from dip-switches */
59 	"(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
67 /* The vendor and product id's for the USB-PC Watchdog card */
78 /* according to documentation max. time to process a command for the USB
84 							Re-trigger Watchdog */
89 #define CMD_READ_WATCHDOG_TIMEOUT	0x18	/* Read Current Watchdog Time */
96 	5,	/* OFF-OFF-OFF	=  5 Sec  */
97 	10,	/* OFF-OFF-ON	= 10 Sec  */
98 	30,	/* OFF-ON-OFF	= 30 Sec  */
99 	60,	/* OFF-ON-ON	=  1 Min  */
100 	300,	/* ON-OFF-OFF	=  5 Min  */
101 	600,	/* ON-OFF-ON	= 10 Min  */
102 	1800,	/* ON-ON-OFF	= 30 Min  */
103 	3600,	/* ON-ON-ON	=  1 hour */
115 	/* save off the usb device pointer */
168 				(struct usb_pcwd_private *)urb->context;  in usb_pcwd_intr_done()
169 	unsigned char *data = usb_pcwd->intr_buffer;  in usb_pcwd_intr_done()
170 	struct device *dev = &usb_pcwd->interface->dev;  in usb_pcwd_intr_done()
173 	switch (urb->status) {  in usb_pcwd_intr_done()
176 	case -ECONNRESET:	/* unlink */  in usb_pcwd_intr_done()
177 	case -ENOENT:  in usb_pcwd_intr_done()
178 	case -ESHUTDOWN:  in usb_pcwd_intr_done()
180 		dev_dbg(dev, "%s - urb shutting down with status: %d",  in usb_pcwd_intr_done()
181 			__func__, urb->status);  in usb_pcwd_intr_done()
183 	/* -EPIPE:  should clear the halt */  in usb_pcwd_intr_done()
185 		dev_dbg(dev, "%s - nonzero urb status received: %d",  in usb_pcwd_intr_done()
186 			__func__, urb->status);  in usb_pcwd_intr_done()
193 	usb_pcwd->cmd_command  = data[0];  in usb_pcwd_intr_done()
194 	usb_pcwd->cmd_data_msb = data[1];  in usb_pcwd_intr_done()
195 	usb_pcwd->cmd_data_lsb = data[2];  in usb_pcwd_intr_done()
198 	atomic_set(&usb_pcwd->cmd_received, 1);  in usb_pcwd_intr_done()
215 	if ((!usb_pcwd) || (!usb_pcwd->exists))  in usb_pcwd_send_command()
216 		return -1;  in usb_pcwd_send_command()
229 	dev_dbg(&usb_pcwd->interface->dev,  in usb_pcwd_send_command()
233 	atomic_set(&usb_pcwd->cmd_received, 0);  in usb_pcwd_send_command()
235 	if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),  in usb_pcwd_send_command()
237 			0x0200, usb_pcwd->interface_number, buf, 6,  in usb_pcwd_send_command()
239 		dev_dbg(&usb_pcwd->interface->dev,  in usb_pcwd_send_command()
249 		if (atomic_read(&usb_pcwd->cmd_received))  in usb_pcwd_send_command()
253 	if ((got_response) && (cmd == usb_pcwd->cmd_command)) {  in usb_pcwd_send_command()
255 		*msb = usb_pcwd->cmd_data_msb;  in usb_pcwd_send_command()
256 		*lsb = usb_pcwd->cmd_data_lsb;  in usb_pcwd_send_command()
276 		return -1;  in usb_pcwd_start()
294 		return -1;  in usb_pcwd_stop()
304 	/* Re-trigger Watchdog */  in usb_pcwd_keepalive()
316 		return -EINVAL;  in usb_pcwd_set_heartbeat()
346 	/* Read the time that's left before rebooting */  in usb_pcwd_get_timeleft()
376 					return -EFAULT;  in usb_pcwd_write()
403 		return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;  in usb_pcwd_ioctl()
414 			return -EFAULT;  in usb_pcwd_ioctl()
421 		int new_options, retval = -EINVAL;  in usb_pcwd_ioctl()
424 			return -EFAULT;  in usb_pcwd_ioctl()
448 			return -EFAULT;  in usb_pcwd_ioctl()
451 			return -EINVAL;  in usb_pcwd_ioctl()
465 			return -EFAULT;  in usb_pcwd_ioctl()
471 		return -ENOTTY;  in usb_pcwd_ioctl()
479 		return -EBUSY;  in usb_pcwd_open()
490 	 *      Shut off the timer.  in usb_pcwd_release()
513 		return -EFAULT;  in usb_pcwd_temperature_read()
516 		return -EFAULT;  in usb_pcwd_temperature_read()
539 		usb_pcwd_stop(usb_pcwd_device);	/* Turn the WDT off */  in usb_pcwd_notify_sys()
587 	usb_free_urb(usb_pcwd->intr_urb);  in usb_pcwd_delete()
588 	usb_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size,  in usb_pcwd_delete()
589 			  usb_pcwd->intr_buffer, usb_pcwd->intr_dma);  in usb_pcwd_delete()
607 	int retval = -ENOMEM;  in usb_pcwd_probe()
616 		return -ENODEV;  in usb_pcwd_probe()
620 	iface_desc = interface->cur_altsetting;  in usb_pcwd_probe()
623 	if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {  in usb_pcwd_probe()
625 		return -ENODEV;  in usb_pcwd_probe()
628 	if (iface_desc->desc.bNumEndpoints < 1)  in usb_pcwd_probe()
629 		return -ENODEV;  in usb_pcwd_probe()
632 	endpoint = &iface_desc->endpoint[0].desc;  in usb_pcwd_probe()
637 		return -ENODEV;  in usb_pcwd_probe()
641 	pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);  in usb_pcwd_probe()
650 	mutex_init(&usb_pcwd->mtx);  in usb_pcwd_probe()
651 	usb_pcwd->udev = udev;  in usb_pcwd_probe()
652 	usb_pcwd->interface = interface;  in usb_pcwd_probe()
653 	usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;  in usb_pcwd_probe()
654 	usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ?  in usb_pcwd_probe()
655 				le16_to_cpu(endpoint->wMaxPacketSize) : 8);  in usb_pcwd_probe()
658 	usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size,  in usb_pcwd_probe()
659 					GFP_KERNEL, &usb_pcwd->intr_dma);  in usb_pcwd_probe()
660 	if (!usb_pcwd->intr_buffer) {  in usb_pcwd_probe()
666 	usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);  in usb_pcwd_probe()
667 	if (!usb_pcwd->intr_urb)  in usb_pcwd_probe()
671 	usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,  in usb_pcwd_probe()
672 			usb_pcwd->intr_buffer, usb_pcwd->intr_size,  in usb_pcwd_probe()
673 			usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);  in usb_pcwd_probe()
674 	usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;  in usb_pcwd_probe()
675 	usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;  in usb_pcwd_probe()
678 	if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {  in usb_pcwd_probe()
680 		retval = -EIO; /* failure */  in usb_pcwd_probe()
685 	usb_pcwd->exists = 1;  in usb_pcwd_probe()
704 	pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",  in usb_pcwd_probe()
706 		((option_switches & 0x10) ? "ON" : "OFF"),  in usb_pcwd_probe()
707 		((option_switches & 0x08) ? "ON" : "OFF"));  in usb_pcwd_probe()
709 	/* If heartbeat = 0 then we use the heartbeat from the dip-switches */  in usb_pcwd_probe()
744 	pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",  in usb_pcwd_probe()
767  *	by clearing dev->udev.
779 	mutex_lock(&usb_pcwd->mtx);  in usb_pcwd_disconnect()
786 	usb_pcwd->exists = 0;  in usb_pcwd_disconnect()
793 	mutex_unlock(&usb_pcwd->mtx);  in usb_pcwd_disconnect()
798 	cards_found--;  in usb_pcwd_disconnect()