^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) * Berkshire USB-PC Watchdog Card Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on source code of the following authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Ken Hollis <kenji@bitgate.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Alan Cox <alan@lxorguk.ukuu.org.uk>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Matt Domsch <Matt_Domsch@dell.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Rob Radez <rob@osinvestor.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Greg Kroah-Hartman <greg@kroah.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * provide warranty for any of this software. This material is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * provided "AS-IS" and at no charge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Thanks also to Simon Machell at Berkshire Products Inc. for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * providing the test hardware. More info is available at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * http://www.berkprod.com/ or http://www.pcwatchdog.com/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/module.h> /* For module specific items */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/moduleparam.h> /* For new moduleparam's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/types.h> /* For standard types (like size_t) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/errno.h> /* For the -ENODEV/... values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/kernel.h> /* For printk/panic/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/delay.h> /* For mdelay function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/miscdevice.h> /* For struct miscdevice */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/watchdog.h> /* For the watchdog specific items */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/notifier.h> /* For notifier support */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/reboot.h> /* For reboot_notifier stuff */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/init.h> /* For __init/__exit/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/fs.h> /* For file operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/usb.h> /* For USB functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/slab.h> /* For kmalloc, ... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/mutex.h> /* For mutex locking */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) /* Module and Version Information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define DRIVER_VERSION "1.02"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define DRIVER_NAME "pcwd_usb"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) MODULE_AUTHOR(DRIVER_AUTHOR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) MODULE_DESCRIPTION(DRIVER_DESC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) delay-time from dip-switches */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static int heartbeat = WATCHDOG_HEARTBEAT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) module_param(heartbeat, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* The vendor and product id's for the USB-PC Watchdog card */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define USB_PCWD_VENDOR_ID 0x0c98
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #define USB_PCWD_PRODUCT_ID 0x1140
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* table of devices that work with this driver */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) static const struct usb_device_id usb_pcwd_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) { } /* Terminating entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) MODULE_DEVICE_TABLE(usb, usb_pcwd_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* according to documentation max. time to process a command for the USB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #define USB_COMMAND_TIMEOUT 250
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* Watchdog's internal commands */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) #define CMD_READ_TEMP 0x02 /* Read Temperature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) Re-trigger Watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #define CMD_TRIGGER CMD_READ_TEMP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) #define CMD_GET_STATUS 0x04 /* Get Status Information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current WatchdogTime */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* Watchdog's Dip Switch heartbeat values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) static const int heartbeat_tbl[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) 5, /* OFF-OFF-OFF = 5 Sec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) 10, /* OFF-OFF-ON = 10 Sec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) 30, /* OFF-ON-OFF = 30 Sec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) 60, /* OFF-ON-ON = 1 Min */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 300, /* ON-OFF-OFF = 5 Min */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 600, /* ON-OFF-ON = 10 Min */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 1800, /* ON-ON-OFF = 30 Min */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 3600, /* ON-ON-ON = 1 hour */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* We can only use 1 card due to the /dev/watchdog restriction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static int cards_found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) /* some internal variables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static unsigned long is_active;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static char expect_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* Structure to hold all of our device specific stuff */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct usb_pcwd_private {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* save off the usb device pointer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct usb_device *udev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* the interface for this device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct usb_interface *interface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* the interface number used for cmd's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) unsigned int interface_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* the buffer to intr data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) unsigned char *intr_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* the dma address for the intr buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) dma_addr_t intr_dma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /* the size of the intr buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) size_t intr_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /* the urb used for the intr pipe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct urb *intr_urb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) /* The command that is reported back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) unsigned char cmd_command;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* The data MSB that is reported back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unsigned char cmd_data_msb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* The data LSB that is reported back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) unsigned char cmd_data_lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) /* true if we received a report after a command */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) atomic_t cmd_received;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* Wether or not the device exists */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) int exists;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /* locks this structure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct mutex mtx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct usb_pcwd_private *usb_pcwd_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* prevent races between open() and disconnect() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) static DEFINE_MUTEX(disconnect_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* local function prototypes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) static int usb_pcwd_probe(struct usb_interface *interface,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) const struct usb_device_id *id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static void usb_pcwd_disconnect(struct usb_interface *interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* usb specific object needed to register this driver with the usb subsystem */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static struct usb_driver usb_pcwd_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .probe = usb_pcwd_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .disconnect = usb_pcwd_disconnect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .id_table = usb_pcwd_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) static void usb_pcwd_intr_done(struct urb *urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct usb_pcwd_private *usb_pcwd =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) (struct usb_pcwd_private *)urb->context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) unsigned char *data = usb_pcwd->intr_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct device *dev = &usb_pcwd->interface->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) switch (urb->status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) case 0: /* success */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) case -ECONNRESET: /* unlink */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) case -ENOENT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) case -ESHUTDOWN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* this urb is terminated, clean up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) dev_dbg(dev, "%s - urb shutting down with status: %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) __func__, urb->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) /* -EPIPE: should clear the halt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) default: /* error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) dev_dbg(dev, "%s - nonzero urb status received: %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) __func__, urb->status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) goto resubmit;
^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) dev_dbg(dev, "received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) data[0], data[1], data[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) usb_pcwd->cmd_command = data[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) usb_pcwd->cmd_data_msb = data[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) usb_pcwd->cmd_data_lsb = data[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* notify anyone waiting that the cmd has finished */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) atomic_set(&usb_pcwd->cmd_received, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) resubmit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) retval = usb_submit_urb(urb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) pr_err("can't resubmit intr, usb_submit_urb failed with result %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) unsigned char cmd, unsigned char *msb, unsigned char *lsb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) int got_response, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) unsigned char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /* We will not send any commands if the USB PCWD device does
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * not exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if ((!usb_pcwd) || (!usb_pcwd->exists))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) buf = kmalloc(6, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if (buf == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* The USB PC Watchdog uses a 6 byte report format.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * The board currently uses only 3 of the six bytes of the report. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) buf[0] = cmd; /* Byte 0 = CMD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) buf[1] = *msb; /* Byte 1 = Data MSB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) buf[2] = *lsb; /* Byte 2 = Data LSB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) dev_dbg(&usb_pcwd->interface->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) buf[0], buf[1], buf[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) atomic_set(&usb_pcwd->cmd_received, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) HID_REQ_SET_REPORT, HID_DT_REPORT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 0x0200, usb_pcwd->interface_number, buf, 6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) USB_COMMAND_TIMEOUT) != 6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) dev_dbg(&usb_pcwd->interface->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) "usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) cmd, *msb, *lsb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /* wait till the usb card processed the command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * with a max. timeout of USB_COMMAND_TIMEOUT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) got_response = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) count++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) mdelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (atomic_read(&usb_pcwd->cmd_received))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) got_response = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* read back response */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) *msb = usb_pcwd->cmd_data_msb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) *lsb = usb_pcwd->cmd_data_lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) return got_response;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) unsigned char msb = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) unsigned char lsb = 0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* Enable Watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) &msb, &lsb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if ((retval == 0) || (lsb == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) pr_err("Card did not acknowledge enable attempt\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) unsigned char msb = 0xA5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) unsigned char lsb = 0xC3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) /* Disable Watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) &msb, &lsb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if ((retval == 0) || (lsb != 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) pr_err("Card did not acknowledge disable attempt\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) unsigned char dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* Re-trigger Watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) unsigned char msb = t / 256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) unsigned char lsb = t % 256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if ((t < 0x0001) || (t > 0xFFFF))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) /* Write new heartbeat to watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) heartbeat = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) int *temperature)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) unsigned char msb, lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * Convert celsius to fahrenheit, since this was
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * the decided 'standard' for this return value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) *temperature = (lsb * 9 / 5) + 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) int *time_left)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) unsigned char msb, lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) /* Read the time that's left before rebooting */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* Note: if the board is not yet armed then we will read 0xFFFF */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) *time_left = (msb << 8) + lsb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) * /dev/watchdog handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* See if we got the magic character 'V' and reload the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) /* note: just in case someone wrote the magic character
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) * five months ago... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) expect_release = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) /* scan to see whether or not we got the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * magic character */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) for (i = 0; i != len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (get_user(c, data + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) expect_release = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /* someone wrote to us, we should reload the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) usb_pcwd_keepalive(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) int __user *p = argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) .options = WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) .identity = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) return put_user(0, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) case WDIOC_GETTEMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) int temperature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) return put_user(temperature, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) int new_options, retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (get_user(new_options, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (new_options & WDIOS_DISABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) usb_pcwd_stop(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (new_options & WDIOS_ENABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) usb_pcwd_start(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) usb_pcwd_keepalive(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) int new_heartbeat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (get_user(new_heartbeat, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) usb_pcwd_keepalive(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return put_user(heartbeat, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) case WDIOC_GETTIMELEFT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) int time_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) return put_user(time_left, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) static int usb_pcwd_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* /dev/watchdog can only be opened once */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (test_and_set_bit(0, &is_active))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) /* Activate */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) usb_pcwd_start(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) usb_pcwd_keepalive(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) static int usb_pcwd_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * Shut off the timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) if (expect_release == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) usb_pcwd_stop(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) pr_crit("Unexpected close, not stopping watchdog!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) usb_pcwd_keepalive(usb_pcwd_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) expect_release = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) clear_bit(0, &is_active);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * /dev/temperature handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) int temperature;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (copy_to_user(data, &temperature, 1))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) * Notify system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (code == SYS_DOWN || code == SYS_HALT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * Kernel Interfaces
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) static const struct file_operations usb_pcwd_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) .write = usb_pcwd_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) .unlocked_ioctl = usb_pcwd_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) .open = usb_pcwd_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) .release = usb_pcwd_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) static struct miscdevice usb_pcwd_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) .fops = &usb_pcwd_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) static const struct file_operations usb_pcwd_temperature_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) .read = usb_pcwd_temperature_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) .open = usb_pcwd_temperature_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) .release = usb_pcwd_temperature_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) static struct miscdevice usb_pcwd_temperature_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) .minor = TEMP_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) .name = "temperature",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) .fops = &usb_pcwd_temperature_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) static struct notifier_block usb_pcwd_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) .notifier_call = usb_pcwd_notify_sys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * usb_pcwd_delete
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) usb_free_urb(usb_pcwd->intr_urb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) usb_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) kfree(usb_pcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) * usb_pcwd_probe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) * Called by the usb core when a new device is connected that it thinks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) * this driver might be interested in.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) static int usb_pcwd_probe(struct usb_interface *interface,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) const struct usb_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct usb_device *udev = interface_to_usbdev(interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) struct usb_host_interface *iface_desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) struct usb_endpoint_descriptor *endpoint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) struct usb_pcwd_private *usb_pcwd = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) int pipe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) int retval = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) int got_fw_rev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) unsigned char fw_rev_major, fw_rev_minor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) char fw_ver_str[20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) unsigned char option_switches, dummy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) cards_found++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (cards_found > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) pr_err("This driver only supports 1 device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) /* get the active interface descriptor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) iface_desc = interface->cur_altsetting;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) /* check out that we have a HID device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) pr_err("The device isn't a Human Interface Device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) if (iface_desc->desc.bNumEndpoints < 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) /* check out the endpoint: it has to be Interrupt & IN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) endpoint = &iface_desc->endpoint[0].desc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (!usb_endpoint_is_int_in(endpoint)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) /* we didn't find a Interrupt endpoint with direction IN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) pr_err("Couldn't find an INTR & IN endpoint\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) /* get a handle to the interrupt data pipe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) /* allocate memory for our device and initialize it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) if (usb_pcwd == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) usb_pcwd_device = usb_pcwd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) mutex_init(&usb_pcwd->mtx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) usb_pcwd->udev = udev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) usb_pcwd->interface = interface;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) le16_to_cpu(endpoint->wMaxPacketSize) : 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) /* set up the memory buffer's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) GFP_KERNEL, &usb_pcwd->intr_dma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (!usb_pcwd->intr_buffer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) pr_err("Out of memory\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) /* allocate the urb's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) if (!usb_pcwd->intr_urb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) /* initialise the intr urb's */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) usb_pcwd->intr_buffer, usb_pcwd->intr_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) /* register our interrupt URB with the USB system */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) pr_err("Problem registering interrupt URB\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) retval = -EIO; /* failure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) /* The device exists and can be communicated with */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) usb_pcwd->exists = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) /* disable card */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) usb_pcwd_stop(usb_pcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) /* Get the Firmware Version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) &fw_rev_major, &fw_rev_minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) if (got_fw_rev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) sprintf(fw_ver_str, "<card no answer>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) pr_info("Found card (Firmware: %s) with temp option\n", fw_ver_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) /* Get switch settings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) &option_switches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) option_switches,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) ((option_switches & 0x10) ? "ON" : "OFF"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) ((option_switches & 0x08) ? "ON" : "OFF"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) if (heartbeat == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) heartbeat = heartbeat_tbl[(option_switches & 0x07)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) /* Check that the heartbeat value is within it's range ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * if not reset to the default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) WATCHDOG_HEARTBEAT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) retval = register_reboot_notifier(&usb_pcwd_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) if (retval != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) pr_err("cannot register reboot notifier (err=%d)\n", retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) retval = misc_register(&usb_pcwd_temperature_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) if (retval != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) TEMP_MINOR, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) goto err_out_unregister_reboot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) retval = misc_register(&usb_pcwd_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (retval != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) WATCHDOG_MINOR, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) goto err_out_misc_deregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) /* we can register the device now, as it is ready */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) usb_set_intfdata(interface, usb_pcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) heartbeat, nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) err_out_misc_deregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) misc_deregister(&usb_pcwd_temperature_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) err_out_unregister_reboot:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) unregister_reboot_notifier(&usb_pcwd_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) if (usb_pcwd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) usb_pcwd_delete(usb_pcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) usb_pcwd_device = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) * usb_pcwd_disconnect
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) * Called by the usb core when the device is removed from the system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) * This routine guarantees that the driver will not submit any more urbs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) * by clearing dev->udev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) static void usb_pcwd_disconnect(struct usb_interface *interface)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) struct usb_pcwd_private *usb_pcwd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) /* prevent races with open() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) mutex_lock(&disconnect_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) usb_pcwd = usb_get_intfdata(interface);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) usb_set_intfdata(interface, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) mutex_lock(&usb_pcwd->mtx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) /* Stop the timer before we leave */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) if (!nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) usb_pcwd_stop(usb_pcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) /* We should now stop communicating with the USB PCWD device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) usb_pcwd->exists = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) /* Deregister */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) misc_deregister(&usb_pcwd_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) misc_deregister(&usb_pcwd_temperature_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) unregister_reboot_notifier(&usb_pcwd_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) mutex_unlock(&usb_pcwd->mtx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) /* Delete the USB PCWD device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) usb_pcwd_delete(usb_pcwd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) cards_found--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) mutex_unlock(&disconnect_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) pr_info("USB PC Watchdog disconnected\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) module_usb_driver(usb_pcwd_driver);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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