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805 lines
21 KiB
805 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Berkshire USB-PC Watchdog Card Driver |
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* |
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* (c) Copyright 2004-2007 Wim Van Sebroeck <[email protected]>. |
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* |
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* Based on source code of the following authors: |
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* Ken Hollis <[email protected]>, |
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* Alan Cox <[email protected]>, |
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* Matt Domsch <[email protected]>, |
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* Rob Radez <[email protected]>, |
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* Greg Kroah-Hartman <[email protected]> |
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* |
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* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor |
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* provide warranty for any of this software. This material is |
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* provided "AS-IS" and at no charge. |
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* |
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* Thanks also to Simon Machell at Berkshire Products Inc. for |
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* providing the test hardware. More info is available at |
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* http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> /* For module specific items */ |
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#include <linux/moduleparam.h> /* For new moduleparam's */ |
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#include <linux/types.h> /* For standard types (like size_t) */ |
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#include <linux/errno.h> /* For the -ENODEV/... values */ |
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#include <linux/kernel.h> /* For printk/panic/... */ |
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#include <linux/delay.h> /* For mdelay function */ |
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#include <linux/miscdevice.h> /* For struct miscdevice */ |
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#include <linux/watchdog.h> /* For the watchdog specific items */ |
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#include <linux/notifier.h> /* For notifier support */ |
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#include <linux/reboot.h> /* For reboot_notifier stuff */ |
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#include <linux/init.h> /* For __init/__exit/... */ |
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#include <linux/fs.h> /* For file operations */ |
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#include <linux/usb.h> /* For USB functions */ |
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#include <linux/slab.h> /* For kmalloc, ... */ |
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#include <linux/mutex.h> /* For mutex locking */ |
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#include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */ |
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
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|
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/* Module and Version Information */ |
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#define DRIVER_VERSION "1.02" |
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#define DRIVER_AUTHOR "Wim Van Sebroeck <[email protected]>" |
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#define DRIVER_DESC "Berkshire USB-PC Watchdog driver" |
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#define DRIVER_NAME "pcwd_usb" |
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MODULE_AUTHOR(DRIVER_AUTHOR); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = |
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delay-time from dip-switches */ |
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static int heartbeat = WATCHDOG_HEARTBEAT; |
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module_param(heartbeat, int, 0); |
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
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"(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" |
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
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|
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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|
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/* The vendor and product id's for the USB-PC Watchdog card */ |
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#define USB_PCWD_VENDOR_ID 0x0c98 |
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#define USB_PCWD_PRODUCT_ID 0x1140 |
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|
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/* table of devices that work with this driver */ |
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static const struct usb_device_id usb_pcwd_table[] = { |
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{ USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, |
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{ } /* Terminating entry */ |
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}; |
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MODULE_DEVICE_TABLE(usb, usb_pcwd_table); |
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|
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/* according to documentation max. time to process a command for the USB |
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* watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ |
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#define USB_COMMAND_TIMEOUT 250 |
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|
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/* Watchdog's internal commands */ |
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#define CMD_READ_TEMP 0x02 /* Read Temperature; |
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Re-trigger Watchdog */ |
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#define CMD_TRIGGER CMD_READ_TEMP |
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#define CMD_GET_STATUS 0x04 /* Get Status Information */ |
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#define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ |
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#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ |
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#define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ |
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#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current WatchdogTime */ |
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#define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ |
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#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG |
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|
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/* Watchdog's Dip Switch heartbeat values */ |
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static const int heartbeat_tbl[] = { |
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5, /* OFF-OFF-OFF = 5 Sec */ |
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10, /* OFF-OFF-ON = 10 Sec */ |
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30, /* OFF-ON-OFF = 30 Sec */ |
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60, /* OFF-ON-ON = 1 Min */ |
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300, /* ON-OFF-OFF = 5 Min */ |
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600, /* ON-OFF-ON = 10 Min */ |
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1800, /* ON-ON-OFF = 30 Min */ |
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3600, /* ON-ON-ON = 1 hour */ |
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}; |
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/* We can only use 1 card due to the /dev/watchdog restriction */ |
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static int cards_found; |
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|
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/* some internal variables */ |
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static unsigned long is_active; |
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static char expect_release; |
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|
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/* Structure to hold all of our device specific stuff */ |
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struct usb_pcwd_private { |
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/* save off the usb device pointer */ |
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struct usb_device *udev; |
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/* the interface for this device */ |
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struct usb_interface *interface; |
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/* the interface number used for cmd's */ |
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unsigned int interface_number; |
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|
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/* the buffer to intr data */ |
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unsigned char *intr_buffer; |
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/* the dma address for the intr buffer */ |
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dma_addr_t intr_dma; |
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/* the size of the intr buffer */ |
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size_t intr_size; |
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/* the urb used for the intr pipe */ |
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struct urb *intr_urb; |
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/* The command that is reported back */ |
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unsigned char cmd_command; |
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/* The data MSB that is reported back */ |
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unsigned char cmd_data_msb; |
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/* The data LSB that is reported back */ |
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unsigned char cmd_data_lsb; |
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/* true if we received a report after a command */ |
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atomic_t cmd_received; |
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/* Wether or not the device exists */ |
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int exists; |
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/* locks this structure */ |
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struct mutex mtx; |
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}; |
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static struct usb_pcwd_private *usb_pcwd_device; |
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/* prevent races between open() and disconnect() */ |
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static DEFINE_MUTEX(disconnect_mutex); |
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/* local function prototypes */ |
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static int usb_pcwd_probe(struct usb_interface *interface, |
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const struct usb_device_id *id); |
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static void usb_pcwd_disconnect(struct usb_interface *interface); |
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/* usb specific object needed to register this driver with the usb subsystem */ |
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static struct usb_driver usb_pcwd_driver = { |
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.name = DRIVER_NAME, |
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.probe = usb_pcwd_probe, |
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.disconnect = usb_pcwd_disconnect, |
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.id_table = usb_pcwd_table, |
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}; |
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static void usb_pcwd_intr_done(struct urb *urb) |
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{ |
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struct usb_pcwd_private *usb_pcwd = |
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(struct usb_pcwd_private *)urb->context; |
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unsigned char *data = usb_pcwd->intr_buffer; |
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struct device *dev = &usb_pcwd->interface->dev; |
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int retval; |
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switch (urb->status) { |
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case 0: /* success */ |
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break; |
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case -ECONNRESET: /* unlink */ |
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case -ENOENT: |
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case -ESHUTDOWN: |
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/* this urb is terminated, clean up */ |
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dev_dbg(dev, "%s - urb shutting down with status: %d", |
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__func__, urb->status); |
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return; |
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/* -EPIPE: should clear the halt */ |
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default: /* error */ |
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dev_dbg(dev, "%s - nonzero urb status received: %d", |
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__func__, urb->status); |
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goto resubmit; |
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} |
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dev_dbg(dev, "received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", |
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data[0], data[1], data[2]); |
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usb_pcwd->cmd_command = data[0]; |
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usb_pcwd->cmd_data_msb = data[1]; |
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usb_pcwd->cmd_data_lsb = data[2]; |
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/* notify anyone waiting that the cmd has finished */ |
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atomic_set(&usb_pcwd->cmd_received, 1); |
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resubmit: |
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retval = usb_submit_urb(urb, GFP_ATOMIC); |
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if (retval) |
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pr_err("can't resubmit intr, usb_submit_urb failed with result %d\n", |
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retval); |
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} |
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static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, |
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unsigned char cmd, unsigned char *msb, unsigned char *lsb) |
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{ |
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int got_response, count; |
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unsigned char *buf; |
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/* We will not send any commands if the USB PCWD device does |
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* not exist */ |
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if ((!usb_pcwd) || (!usb_pcwd->exists)) |
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return -1; |
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buf = kmalloc(6, GFP_KERNEL); |
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if (buf == NULL) |
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return 0; |
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/* The USB PC Watchdog uses a 6 byte report format. |
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* The board currently uses only 3 of the six bytes of the report. */ |
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buf[0] = cmd; /* Byte 0 = CMD */ |
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buf[1] = *msb; /* Byte 1 = Data MSB */ |
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buf[2] = *lsb; /* Byte 2 = Data LSB */ |
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buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ |
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dev_dbg(&usb_pcwd->interface->dev, |
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"sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", |
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buf[0], buf[1], buf[2]); |
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atomic_set(&usb_pcwd->cmd_received, 0); |
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if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), |
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HID_REQ_SET_REPORT, HID_DT_REPORT, |
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0x0200, usb_pcwd->interface_number, buf, 6, |
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USB_COMMAND_TIMEOUT) != 6) { |
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dev_dbg(&usb_pcwd->interface->dev, |
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"usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", |
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cmd, *msb, *lsb); |
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} |
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/* wait till the usb card processed the command, |
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* with a max. timeout of USB_COMMAND_TIMEOUT */ |
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got_response = 0; |
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for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); |
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count++) { |
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mdelay(1); |
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if (atomic_read(&usb_pcwd->cmd_received)) |
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got_response = 1; |
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} |
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if ((got_response) && (cmd == usb_pcwd->cmd_command)) { |
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/* read back response */ |
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*msb = usb_pcwd->cmd_data_msb; |
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*lsb = usb_pcwd->cmd_data_lsb; |
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} |
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kfree(buf); |
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return got_response; |
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} |
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static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) |
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{ |
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unsigned char msb = 0x00; |
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unsigned char lsb = 0x00; |
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int retval; |
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/* Enable Watchdog */ |
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retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, |
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&msb, &lsb); |
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if ((retval == 0) || (lsb == 0)) { |
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pr_err("Card did not acknowledge enable attempt\n"); |
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return -1; |
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} |
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return 0; |
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} |
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static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) |
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{ |
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unsigned char msb = 0xA5; |
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unsigned char lsb = 0xC3; |
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int retval; |
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/* Disable Watchdog */ |
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retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, |
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&msb, &lsb); |
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if ((retval == 0) || (lsb != 0)) { |
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pr_err("Card did not acknowledge disable attempt\n"); |
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return -1; |
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} |
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return 0; |
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} |
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static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) |
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{ |
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unsigned char dummy; |
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/* Re-trigger Watchdog */ |
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usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); |
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return 0; |
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} |
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static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) |
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{ |
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unsigned char msb = t / 256; |
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unsigned char lsb = t % 256; |
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if ((t < 0x0001) || (t > 0xFFFF)) |
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return -EINVAL; |
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/* Write new heartbeat to watchdog */ |
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usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); |
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heartbeat = t; |
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return 0; |
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} |
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static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, |
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int *temperature) |
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{ |
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unsigned char msb, lsb; |
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usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); |
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/* |
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* Convert celsius to fahrenheit, since this was |
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* the decided 'standard' for this return value. |
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*/ |
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*temperature = (lsb * 9 / 5) + 32; |
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return 0; |
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} |
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static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, |
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int *time_left) |
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{ |
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unsigned char msb, lsb; |
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/* Read the time that's left before rebooting */ |
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/* Note: if the board is not yet armed then we will read 0xFFFF */ |
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usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); |
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*time_left = (msb << 8) + lsb; |
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return 0; |
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} |
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/* |
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* /dev/watchdog handling |
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*/ |
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static ssize_t usb_pcwd_write(struct file *file, const char __user *data, |
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size_t len, loff_t *ppos) |
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{ |
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/* See if we got the magic character 'V' and reload the timer */ |
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if (len) { |
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if (!nowayout) { |
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size_t i; |
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/* note: just in case someone wrote the magic character |
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* five months ago... */ |
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expect_release = 0; |
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/* scan to see whether or not we got the |
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* magic character */ |
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for (i = 0; i != len; i++) { |
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char c; |
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if (get_user(c, data + i)) |
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return -EFAULT; |
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if (c == 'V') |
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expect_release = 42; |
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} |
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} |
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/* someone wrote to us, we should reload the timer */ |
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usb_pcwd_keepalive(usb_pcwd_device); |
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} |
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return len; |
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} |
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static long usb_pcwd_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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void __user *argp = (void __user *)arg; |
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int __user *p = argp; |
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static const struct watchdog_info ident = { |
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.options = WDIOF_KEEPALIVEPING | |
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WDIOF_SETTIMEOUT | |
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WDIOF_MAGICCLOSE, |
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.firmware_version = 1, |
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.identity = DRIVER_NAME, |
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}; |
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switch (cmd) { |
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case WDIOC_GETSUPPORT: |
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; |
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case WDIOC_GETSTATUS: |
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case WDIOC_GETBOOTSTATUS: |
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return put_user(0, p); |
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case WDIOC_GETTEMP: |
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{ |
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int temperature; |
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if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
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return -EFAULT; |
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return put_user(temperature, p); |
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} |
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case WDIOC_SETOPTIONS: |
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{ |
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int new_options, retval = -EINVAL; |
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if (get_user(new_options, p)) |
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return -EFAULT; |
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if (new_options & WDIOS_DISABLECARD) { |
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usb_pcwd_stop(usb_pcwd_device); |
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retval = 0; |
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} |
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if (new_options & WDIOS_ENABLECARD) { |
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usb_pcwd_start(usb_pcwd_device); |
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retval = 0; |
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} |
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return retval; |
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} |
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case WDIOC_KEEPALIVE: |
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usb_pcwd_keepalive(usb_pcwd_device); |
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return 0; |
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case WDIOC_SETTIMEOUT: |
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{ |
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int new_heartbeat; |
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if (get_user(new_heartbeat, p)) |
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return -EFAULT; |
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if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) |
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return -EINVAL; |
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usb_pcwd_keepalive(usb_pcwd_device); |
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} |
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fallthrough; |
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case WDIOC_GETTIMEOUT: |
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return put_user(heartbeat, p); |
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case WDIOC_GETTIMELEFT: |
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{ |
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int time_left; |
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if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) |
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return -EFAULT; |
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return put_user(time_left, p); |
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} |
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default: |
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return -ENOTTY; |
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} |
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} |
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static int usb_pcwd_open(struct inode *inode, struct file *file) |
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{ |
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/* /dev/watchdog can only be opened once */ |
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if (test_and_set_bit(0, &is_active)) |
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return -EBUSY; |
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/* Activate */ |
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usb_pcwd_start(usb_pcwd_device); |
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usb_pcwd_keepalive(usb_pcwd_device); |
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return stream_open(inode, file); |
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} |
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static int usb_pcwd_release(struct inode *inode, struct file *file) |
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{ |
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/* |
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* Shut off the timer. |
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*/ |
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if (expect_release == 42) { |
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usb_pcwd_stop(usb_pcwd_device); |
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} else { |
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pr_crit("Unexpected close, not stopping watchdog!\n"); |
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usb_pcwd_keepalive(usb_pcwd_device); |
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} |
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expect_release = 0; |
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clear_bit(0, &is_active); |
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return 0; |
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} |
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/* |
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* /dev/temperature handling |
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*/ |
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static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, |
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size_t len, loff_t *ppos) |
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{ |
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int temperature; |
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if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
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return -EFAULT; |
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|
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if (copy_to_user(data, &temperature, 1)) |
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return -EFAULT; |
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return 1; |
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} |
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static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) |
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{ |
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return stream_open(inode, file); |
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} |
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static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) |
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{ |
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return 0; |
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} |
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/* |
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* Notify system |
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*/ |
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static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, |
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void *unused) |
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{ |
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if (code == SYS_DOWN || code == SYS_HALT) |
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usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */ |
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return NOTIFY_DONE; |
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} |
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|
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/* |
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* Kernel Interfaces |
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*/ |
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static const struct file_operations usb_pcwd_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.write = usb_pcwd_write, |
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.unlocked_ioctl = usb_pcwd_ioctl, |
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.compat_ioctl = compat_ptr_ioctl, |
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.open = usb_pcwd_open, |
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.release = usb_pcwd_release, |
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}; |
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static struct miscdevice usb_pcwd_miscdev = { |
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.minor = WATCHDOG_MINOR, |
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.name = "watchdog", |
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.fops = &usb_pcwd_fops, |
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}; |
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|
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static const struct file_operations usb_pcwd_temperature_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.read = usb_pcwd_temperature_read, |
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.open = usb_pcwd_temperature_open, |
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.release = usb_pcwd_temperature_release, |
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}; |
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|
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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);
|
|
|