Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
/*
 *	Berkshire USB-PC Watchdog Card Driver
 *
 *	(c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>.
 *
 *	Based on source code of the following authors:
 *	  Ken Hollis <kenji@bitgate.com>,
 *	  Alan Cox <alan@lxorguk.ukuu.org.uk>,
 *	  Matt Domsch <Matt_Domsch@dell.com>,
 *	  Rob Radez <rob@osinvestor.com>,
 *	  Greg Kroah-Hartman <greg@kroah.com>
 *
 *	Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
 *	provide warranty for any of this software. This material is
 *	provided "AS-IS" and at no charge.
 *
 *	Thanks also to Simon Machell at Berkshire Products Inc. for
 *	providing the test hardware. More info is available at
 *	http://www.berkprod.com/ or http://www.pcwatchdog.com/
 */
 
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
#include <linux/module.h>	/* For module specific items */
#include <linux/moduleparam.h>	/* For new moduleparam's */
#include <linux/types.h>	/* For standard types (like size_t) */
#include <linux/errno.h>	/* For the -ENODEV/... values */
#include <linux/kernel.h>	/* For printk/panic/... */
#include <linux/delay.h>	/* For mdelay function */
#include <linux/miscdevice.h>	/* For struct miscdevice */
#include <linux/watchdog.h>	/* For the watchdog specific items */
#include <linux/notifier.h>	/* For notifier support */
#include <linux/reboot.h>	/* For reboot_notifier stuff */
#include <linux/init.h>		/* For __init/__exit/... */
#include <linux/fs.h>		/* For file operations */
#include <linux/usb.h>		/* For USB functions */
#include <linux/slab.h>		/* For kmalloc, ... */
#include <linux/mutex.h>	/* For mutex locking */
#include <linux/hid.h>		/* For HID_REQ_SET_REPORT & HID_DT_REPORT */
#include <linux/uaccess.h>	/* For copy_to_user/put_user/... */
 
 
/* Module and Version Information */
#define DRIVER_VERSION "1.02"
#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
#define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
#define DRIVER_NAME "pcwd_usb"
 
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
 
#define WATCHDOG_HEARTBEAT 0	/* default heartbeat =
<------><------><------><------><------><------>delay-time from dip-switches */
static int heartbeat = WATCHDOG_HEARTBEAT;
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
<------>"(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
<------><------><------><------>__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 
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) ")");
 
/* The vendor and product id's for the USB-PC Watchdog card */
#define USB_PCWD_VENDOR_ID	0x0c98
#define USB_PCWD_PRODUCT_ID	0x1140
 
/* table of devices that work with this driver */
static const struct usb_device_id usb_pcwd_table[] = {
<------>{ USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
<------>{ }					/* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, usb_pcwd_table);
 
/* according to documentation max. time to process a command for the USB
 * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
#define USB_COMMAND_TIMEOUT	250
 
/* Watchdog's internal commands */
#define CMD_READ_TEMP			0x02	/* Read Temperature;
<------><------><------><------><------><------><------>Re-trigger Watchdog */
#define CMD_TRIGGER			CMD_READ_TEMP
#define CMD_GET_STATUS			0x04	/* Get Status Information */
#define CMD_GET_FIRMWARE_VERSION	0x08	/* Get Firmware Version */
#define CMD_GET_DIP_SWITCH_SETTINGS	0x0c	/* Get Dip Switch Settings */
#define CMD_READ_WATCHDOG_TIMEOUT	0x18	/* Read Current Watchdog Time */
#define CMD_WRITE_WATCHDOG_TIMEOUT	0x19	/* Write Current WatchdogTime */
#define CMD_ENABLE_WATCHDOG		0x30	/* Enable / Disable Watchdog */
#define CMD_DISABLE_WATCHDOG		CMD_ENABLE_WATCHDOG
 
/* Watchdog's Dip Switch heartbeat values */
static const int heartbeat_tbl[] = {
<------>5,	/* OFF-OFF-OFF	=  5 Sec  */
<------>10,	/* OFF-OFF-ON	= 10 Sec  */
<------>30,	/* OFF-ON-OFF	= 30 Sec  */
<------>60,	/* OFF-ON-ON	=  1 Min  */
<------>300,	/* ON-OFF-OFF	=  5 Min  */
<------>600,	/* ON-OFF-ON	= 10 Min  */
<------>1800,	/* ON-ON-OFF	= 30 Min  */
<------>3600,	/* ON-ON-ON	=  1 hour */
};
 
/* We can only use 1 card due to the /dev/watchdog restriction */
static int cards_found;
 
/* some internal variables */
static unsigned long is_active;
static char expect_release;
 
/* Structure to hold all of our device specific stuff */
struct usb_pcwd_private {
<------>/* save off the usb device pointer */
<------>struct usb_device	*udev;
<------>/* the interface for this device */
<------>struct usb_interface	*interface;
 
<------>/* the interface number used for cmd's */
<------>unsigned int		interface_number;
 
<------>/* the buffer to intr data */
<------>unsigned char		*intr_buffer;
<------>/* the dma address for the intr buffer */
<------>dma_addr_t		intr_dma;
<------>/* the size of the intr buffer */
<------>size_t			intr_size;
<------>/* the urb used for the intr pipe */
<------>struct urb		*intr_urb;
 
<------>/* The command that is reported back */
<------>unsigned char		cmd_command;
<------>/* The data MSB that is reported back */
<------>unsigned char		cmd_data_msb;
<------>/* The data LSB that is reported back */
<------>unsigned char		cmd_data_lsb;
<------>/* true if we received a report after a command */
<------>atomic_t		cmd_received;
 
<------>/* Wether or not the device exists */
<------>int			exists;
<------>/* locks this structure */
<------>struct mutex		mtx;
};
static struct usb_pcwd_private *usb_pcwd_device;
 
/* prevent races between open() and disconnect() */
static DEFINE_MUTEX(disconnect_mutex);
 
/* local function prototypes */
static int usb_pcwd_probe(struct usb_interface *interface,
<------><------><------><------><------><------>const struct usb_device_id *id);
static void usb_pcwd_disconnect(struct usb_interface *interface);
 
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver usb_pcwd_driver = {
<------>.name =		DRIVER_NAME,
<------>.probe =	usb_pcwd_probe,
<------>.disconnect =	usb_pcwd_disconnect,
<------>.id_table =	usb_pcwd_table,
};
 
 
static void usb_pcwd_intr_done(struct urb *urb)
{
<------>struct usb_pcwd_private *usb_pcwd =
<------><------><------><------>(struct usb_pcwd_private *)urb->context;
<------>unsigned char *data = usb_pcwd->intr_buffer;
<------>struct device *dev = &usb_pcwd->interface->dev;
<------>int retval;
 
<------>switch (urb->status) {
<------>case 0:			/* success */
<------><------>break;
<------>case -ECONNRESET:	/* unlink */
<------>case -ENOENT:
<------>case -ESHUTDOWN:
<------><------>/* this urb is terminated, clean up */
<------><------>dev_dbg(dev, "%s - urb shutting down with status: %d",
<------><------><------>__func__, urb->status);
<------><------>return;
<------>/* -EPIPE:  should clear the halt */
<------>default:		/* error */
<------><------>dev_dbg(dev, "%s - nonzero urb status received: %d",
<------><------><------>__func__, urb->status);
<------><------>goto resubmit;
<------>}
 
<------>dev_dbg(dev, "received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
<------><------>data[0], data[1], data[2]);
 
<------>usb_pcwd->cmd_command  = data[0];
<------>usb_pcwd->cmd_data_msb = data[1];
<------>usb_pcwd->cmd_data_lsb = data[2];
 
<------>/* notify anyone waiting that the cmd has finished */
<------>atomic_set(&usb_pcwd->cmd_received, 1);
 
resubmit:
<------>retval = usb_submit_urb(urb, GFP_ATOMIC);
<------>if (retval)
<------><------>pr_err("can't resubmit intr, usb_submit_urb failed with result %d\n",
<------><------>       retval);
}
 
static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
<------><------>unsigned char cmd, unsigned char *msb, unsigned char *lsb)
{
<------>int got_response, count;
<------>unsigned char *buf;
 
<------>/* We will not send any commands if the USB PCWD device does
<------> * not exist */
<------>if ((!usb_pcwd) || (!usb_pcwd->exists))
<------><------>return -1;
 
<------>buf = kmalloc(6, GFP_KERNEL);
<------>if (buf == NULL)
<------><------>return 0;
 
<------>/* The USB PC Watchdog uses a 6 byte report format.
<------> * The board currently uses only 3 of the six bytes of the report. */
<------>buf[0] = cmd;			/* Byte 0 = CMD */
<------>buf[1] = *msb;			/* Byte 1 = Data MSB */
<------>buf[2] = *lsb;			/* Byte 2 = Data LSB */
<------>buf[3] = buf[4] = buf[5] = 0;	/* All other bytes not used */
 
<------>dev_dbg(&usb_pcwd->interface->dev,
<------><------>"sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
<------><------>buf[0], buf[1], buf[2]);
 
<------>atomic_set(&usb_pcwd->cmd_received, 0);
 
<------>if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
<------><------><------>HID_REQ_SET_REPORT, HID_DT_REPORT,
<------><------><------>0x0200, usb_pcwd->interface_number, buf, 6,
<------><------><------>USB_COMMAND_TIMEOUT) != 6) {
<------><------>dev_dbg(&usb_pcwd->interface->dev,
<------><------><------>"usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n",
<------><------><------>cmd, *msb, *lsb);
<------>}
<------>/* wait till the usb card processed the command,
<------> * with a max. timeout of USB_COMMAND_TIMEOUT */
<------>got_response = 0;
<------>for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response);
<------><------><------><------><------><------><------><------>count++) {
<------><------>mdelay(1);
<------><------>if (atomic_read(&usb_pcwd->cmd_received))
<------><------><------>got_response = 1;
<------>}
 
<------>if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
<------><------>/* read back response */
<------><------>*msb = usb_pcwd->cmd_data_msb;
<------><------>*lsb = usb_pcwd->cmd_data_lsb;
<------>}
 
<------>kfree(buf);
 
<------>return got_response;
}
 
static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
{
<------>unsigned char msb = 0x00;
<------>unsigned char lsb = 0x00;
<------>int retval;
 
<------>/* Enable Watchdog */
<------>retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG,
<------><------><------><------><------><------><------><------>&msb, &lsb);
 
<------>if ((retval == 0) || (lsb == 0)) {
<------><------>pr_err("Card did not acknowledge enable attempt\n");
<------><------>return -1;
<------>}
 
<------>return 0;
}
 
static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
{
<------>unsigned char msb = 0xA5;
<------>unsigned char lsb = 0xC3;
<------>int retval;
 
<------>/* Disable Watchdog */
<------>retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG,
<------><------><------><------><------><------><------><------>&msb, &lsb);
 
<------>if ((retval == 0) || (lsb != 0)) {
<------><------>pr_err("Card did not acknowledge disable attempt\n");
<------><------>return -1;
<------>}
 
<------>return 0;
}
 
static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
{
<------>unsigned char dummy;
 
<------>/* Re-trigger Watchdog */
<------>usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
 
<------>return 0;
}
 
static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
{
<------>unsigned char msb = t / 256;
<------>unsigned char lsb = t % 256;
 
<------>if ((t < 0x0001) || (t > 0xFFFF))
<------><------>return -EINVAL;
 
<------>/* Write new heartbeat to watchdog */
<------>usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
 
<------>heartbeat = t;
<------>return 0;
}
 
static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
<------><------><------><------><------><------><------>int *temperature)
{
<------>unsigned char msb, lsb;
 
<------>usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
 
<------>/*
<------> * Convert celsius to fahrenheit, since this was
<------> * the decided 'standard' for this return value.
<------> */
<------>*temperature = (lsb * 9 / 5) + 32;
 
<------>return 0;
}
 
static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd,
<------><------><------><------><------><------><------><------>int *time_left)
{
<------>unsigned char msb, lsb;
 
<------>/* Read the time that's left before rebooting */
<------>/* Note: if the board is not yet armed then we will read 0xFFFF */
<------>usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 
<------>*time_left = (msb << 8) + lsb;
 
<------>return 0;
}
 
/*
 *	/dev/watchdog handling
 */
 
static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
<------><------><------><------><------><------>size_t len, loff_t *ppos)
{
<------>/* See if we got the magic character 'V' and reload the timer */
<------>if (len) {
<------><------>if (!nowayout) {
<------><------><------>size_t i;
 
<------><------><------>/* note: just in case someone wrote the magic character
<------><------><------> * five months ago... */
<------><------><------>expect_release = 0;
 
<------><------><------>/* scan to see whether or not we got the
<------><------><------> * magic character */
<------><------><------>for (i = 0; i != len; i++) {
<------><------><------><------>char c;
<------><------><------><------>if (get_user(c, data + i))
<------><------><------><------><------>return -EFAULT;
<------><------><------><------>if (c == 'V')
<------><------><------><------><------>expect_release = 42;
<------><------><------>}
<------><------>}
 
<------><------>/* someone wrote to us, we should reload the timer */
<------><------>usb_pcwd_keepalive(usb_pcwd_device);
<------>}
<------>return len;
}
 
static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
<------><------><------><------><------><------>unsigned long arg)
{
<------>void __user *argp = (void __user *)arg;
<------>int __user *p = argp;
<------>static const struct watchdog_info ident = {
<------><------>.options =		WDIOF_KEEPALIVEPING |
<------><------><------><------><------>WDIOF_SETTIMEOUT |
<------><------><------><------><------>WDIOF_MAGICCLOSE,
<------><------>.firmware_version =	1,
<------><------>.identity =		DRIVER_NAME,
<------>};
 
<------>switch (cmd) {
<------>case WDIOC_GETSUPPORT:
<------><------>return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 
<------>case WDIOC_GETSTATUS:
<------>case WDIOC_GETBOOTSTATUS:
<------><------>return put_user(0, p);
 
<------>case WDIOC_GETTEMP:
<------>{
<------><------>int temperature;
 
<------><------>if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
<------><------><------>return -EFAULT;
 
<------><------>return put_user(temperature, p);
<------>}
 
<------>case WDIOC_SETOPTIONS:
<------>{
<------><------>int new_options, retval = -EINVAL;
 
<------><------>if (get_user(new_options, p))
<------><------><------>return -EFAULT;
 
<------><------>if (new_options & WDIOS_DISABLECARD) {
<------><------><------>usb_pcwd_stop(usb_pcwd_device);
<------><------><------>retval = 0;
<------><------>}
 
<------><------>if (new_options & WDIOS_ENABLECARD) {
<------><------><------>usb_pcwd_start(usb_pcwd_device);
<------><------><------>retval = 0;
<------><------>}
 
<------><------>return retval;
<------>}
 
<------>case WDIOC_KEEPALIVE:
<------><------>usb_pcwd_keepalive(usb_pcwd_device);
<------><------>return 0;
 
<------>case WDIOC_SETTIMEOUT:
<------>{
<------><------>int new_heartbeat;
 
<------><------>if (get_user(new_heartbeat, p))
<------><------><------>return -EFAULT;
 
<------><------>if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
<------><------><------>return -EINVAL;
 
<------><------>usb_pcwd_keepalive(usb_pcwd_device);
<------>}
<------><------>fallthrough;
 
<------>case WDIOC_GETTIMEOUT:
<------><------>return put_user(heartbeat, p);
 
<------>case WDIOC_GETTIMELEFT:
<------>{
<------><------>int time_left;
 
<------><------>if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
<------><------><------>return -EFAULT;
 
<------><------>return put_user(time_left, p);
<------>}
 
<------>default:
<------><------>return -ENOTTY;
<------>}
}
 
static int usb_pcwd_open(struct inode *inode, struct file *file)
{
<------>/* /dev/watchdog can only be opened once */
<------>if (test_and_set_bit(0, &is_active))
<------><------>return -EBUSY;
 
<------>/* Activate */
<------>usb_pcwd_start(usb_pcwd_device);
<------>usb_pcwd_keepalive(usb_pcwd_device);
<------>return stream_open(inode, file);
}
 
static int usb_pcwd_release(struct inode *inode, struct file *file)
{
<------>/*
<------> *      Shut off the timer.
<------> */
<------>if (expect_release == 42) {
<------><------>usb_pcwd_stop(usb_pcwd_device);
<------>} else {
<------><------>pr_crit("Unexpected close, not stopping watchdog!\n");
<------><------>usb_pcwd_keepalive(usb_pcwd_device);
<------>}
<------>expect_release = 0;
<------>clear_bit(0, &is_active);
<------>return 0;
}
 
/*
 *	/dev/temperature handling
 */
 
static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
<------><------><------><------>size_t len, loff_t *ppos)
{
<------>int temperature;
 
<------>if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
<------><------>return -EFAULT;
 
<------>if (copy_to_user(data, &temperature, 1))
<------><------>return -EFAULT;
 
<------>return 1;
}
 
static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
{
<------>return stream_open(inode, file);
}
 
static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
{
<------>return 0;
}
 
/*
 *	Notify system
 */
 
static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code,
<------><------><------><------><------><------><------><------>void *unused)
{
<------>if (code == SYS_DOWN || code == SYS_HALT)
<------><------>usb_pcwd_stop(usb_pcwd_device);	/* Turn the WDT off */
 
<------>return NOTIFY_DONE;
}
 
/*
 *	Kernel Interfaces
 */
 
static const struct file_operations usb_pcwd_fops = {
<------>.owner =	THIS_MODULE,
<------>.llseek =	no_llseek,
<------>.write =	usb_pcwd_write,
<------>.unlocked_ioctl = usb_pcwd_ioctl,
<------>.compat_ioctl = compat_ptr_ioctl,
<------>.open =		usb_pcwd_open,
<------>.release =	usb_pcwd_release,
};
 
static struct miscdevice usb_pcwd_miscdev = {
<------>.minor =	WATCHDOG_MINOR,
<------>.name =		"watchdog",
<------>.fops =		&usb_pcwd_fops,
};
 
static const struct file_operations usb_pcwd_temperature_fops = {
<------>.owner =	THIS_MODULE,
<------>.llseek =	no_llseek,
<------>.read =		usb_pcwd_temperature_read,
<------>.open =		usb_pcwd_temperature_open,
<------>.release =	usb_pcwd_temperature_release,
};
 
static struct miscdevice usb_pcwd_temperature_miscdev = {
<------>.minor =	TEMP_MINOR,
<------>.name =		"temperature",
<------>.fops =		&usb_pcwd_temperature_fops,
};
 
static struct notifier_block usb_pcwd_notifier = {
<------>.notifier_call =	usb_pcwd_notify_sys,
};
 
/**
 *	usb_pcwd_delete
 */
static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd)
{
<------>usb_free_urb(usb_pcwd->intr_urb);
<------>usb_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size,
<------><------><------>  usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
<------>kfree(usb_pcwd);
}
 
/**
 *	usb_pcwd_probe
 *
 *	Called by the usb core when a new device is connected that it thinks
 *	this driver might be interested in.
 */
static int usb_pcwd_probe(struct usb_interface *interface,
<------><------><------><------><------><------>const struct usb_device_id *id)
{
<------>struct usb_device *udev = interface_to_usbdev(interface);
<------>struct usb_host_interface *iface_desc;
<------>struct usb_endpoint_descriptor *endpoint;
<------>struct usb_pcwd_private *usb_pcwd = NULL;
<------>int pipe;
<------>int retval = -ENOMEM;
<------>int got_fw_rev;
<------>unsigned char fw_rev_major, fw_rev_minor;
<------>char fw_ver_str[20];
<------>unsigned char option_switches, dummy;
 
<------>cards_found++;
<------>if (cards_found > 1) {
<------><------>pr_err("This driver only supports 1 device\n");
<------><------>return -ENODEV;
<------>}
 
<------>/* get the active interface descriptor */
<------>iface_desc = interface->cur_altsetting;
 
<------>/* check out that we have a HID device */
<------>if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
<------><------>pr_err("The device isn't a Human Interface Device\n");
<------><------>return -ENODEV;
<------>}
 
<------>if (iface_desc->desc.bNumEndpoints < 1)
<------><------>return -ENODEV;
 
<------>/* check out the endpoint: it has to be Interrupt & IN */
<------>endpoint = &iface_desc->endpoint[0].desc;
 
<------>if (!usb_endpoint_is_int_in(endpoint)) {
<------><------>/* we didn't find a Interrupt endpoint with direction IN */
<------><------>pr_err("Couldn't find an INTR & IN endpoint\n");
<------><------>return -ENODEV;
<------>}
 
<------>/* get a handle to the interrupt data pipe */
<------>pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
 
<------>/* allocate memory for our device and initialize it */
<------>usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
<------>if (usb_pcwd == NULL)
<------><------>goto error;
 
<------>usb_pcwd_device = usb_pcwd;
 
<------>mutex_init(&usb_pcwd->mtx);
<------>usb_pcwd->udev = udev;
<------>usb_pcwd->interface = interface;
<------>usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
<------>usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ?
<------><------><------><------>le16_to_cpu(endpoint->wMaxPacketSize) : 8);
 
<------>/* set up the memory buffer's */
<------>usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size,
<------><------><------><------><------>GFP_KERNEL, &usb_pcwd->intr_dma);
<------>if (!usb_pcwd->intr_buffer) {
<------><------>pr_err("Out of memory\n");
<------><------>goto error;
<------>}
 
<------>/* allocate the urb's */
<------>usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
<------>if (!usb_pcwd->intr_urb)
<------><------>goto error;
 
<------>/* initialise the intr urb's */
<------>usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
<------><------><------>usb_pcwd->intr_buffer, usb_pcwd->intr_size,
<------><------><------>usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
<------>usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
<------>usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 
<------>/* register our interrupt URB with the USB system */
<------>if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
<------><------>pr_err("Problem registering interrupt URB\n");
<------><------>retval = -EIO; /* failure */
<------><------>goto error;
<------>}
 
<------>/* The device exists and can be communicated with */
<------>usb_pcwd->exists = 1;
 
<------>/* disable card */
<------>usb_pcwd_stop(usb_pcwd);
 
<------>/* Get the Firmware Version */
<------>got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION,
<------><------><------><------><------><------>&fw_rev_major, &fw_rev_minor);
<------>if (got_fw_rev)
<------><------>sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
<------>else
<------><------>sprintf(fw_ver_str, "<card no answer>");
 
<------>pr_info("Found card (Firmware: %s) with temp option\n", fw_ver_str);
 
<------>/* Get switch settings */
<------>usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy,
<------><------><------><------><------><------><------>&option_switches);
 
<------>pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
<------><------>option_switches,
<------><------>((option_switches & 0x10) ? "ON" : "OFF"),
<------><------>((option_switches & 0x08) ? "ON" : "OFF"));
 
<------>/* If heartbeat = 0 then we use the heartbeat from the dip-switches */
<------>if (heartbeat == 0)
<------><------>heartbeat = heartbeat_tbl[(option_switches & 0x07)];
 
<------>/* Check that the heartbeat value is within it's range ;
<------> * if not reset to the default */
<------>if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
<------><------>usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
<------><------>pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
<------><------><------>WATCHDOG_HEARTBEAT);
<------>}
 
<------>retval = register_reboot_notifier(&usb_pcwd_notifier);
<------>if (retval != 0) {
<------><------>pr_err("cannot register reboot notifier (err=%d)\n", retval);
<------><------>goto error;
<------>}
 
<------>retval = misc_register(&usb_pcwd_temperature_miscdev);
<------>if (retval != 0) {
<------><------>pr_err("cannot register miscdev on minor=%d (err=%d)\n",
<------><------>       TEMP_MINOR, retval);
<------><------>goto err_out_unregister_reboot;
<------>}
 
<------>retval = misc_register(&usb_pcwd_miscdev);
<------>if (retval != 0) {
<------><------>pr_err("cannot register miscdev on minor=%d (err=%d)\n",
<------><------>       WATCHDOG_MINOR, retval);
<------><------>goto err_out_misc_deregister;
<------>}
 
<------>/* we can register the device now, as it is ready */
<------>usb_set_intfdata(interface, usb_pcwd);
 
<------>pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
<------><------>heartbeat, nowayout);
 
<------>return 0;
 
err_out_misc_deregister:
<------>misc_deregister(&usb_pcwd_temperature_miscdev);
err_out_unregister_reboot:
<------>unregister_reboot_notifier(&usb_pcwd_notifier);
error:
<------>if (usb_pcwd)
<------><------>usb_pcwd_delete(usb_pcwd);
<------>usb_pcwd_device = NULL;
<------>return retval;
}
 
 
/**
 *	usb_pcwd_disconnect
 *
 *	Called by the usb core when the device is removed from the system.
 *
 *	This routine guarantees that the driver will not submit any more urbs
 *	by clearing dev->udev.
 */
static void usb_pcwd_disconnect(struct usb_interface *interface)
{
<------>struct usb_pcwd_private *usb_pcwd;
 
<------>/* prevent races with open() */
<------>mutex_lock(&disconnect_mutex);
 
<------>usb_pcwd = usb_get_intfdata(interface);
<------>usb_set_intfdata(interface, NULL);
 
<------>mutex_lock(&usb_pcwd->mtx);
 
<------>/* Stop the timer before we leave */
<------>if (!nowayout)
<------><------>usb_pcwd_stop(usb_pcwd);
 
<------>/* We should now stop communicating with the USB PCWD device */
<------>usb_pcwd->exists = 0;
 
<------>/* Deregister */
<------>misc_deregister(&usb_pcwd_miscdev);
<------>misc_deregister(&usb_pcwd_temperature_miscdev);
<------>unregister_reboot_notifier(&usb_pcwd_notifier);
 
<------>mutex_unlock(&usb_pcwd->mtx);
 
<------>/* Delete the USB PCWD device */
<------>usb_pcwd_delete(usb_pcwd);
 
<------>cards_found--;
 
<------>mutex_unlock(&disconnect_mutex);
 
<------>pr_info("USB PC Watchdog disconnected\n");
}
 
module_usb_driver(usb_pcwd_driver);