| /* |
| * Berkshire USB-PC Watchdog Card Driver |
| * |
| * (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>. |
| * |
| * Based on source code of the following authors: |
| * Ken Hollis <kenji@bitgate.com>, |
| * Alan Cox <alan@redhat.com>, |
| * Matt Domsch <Matt_Domsch@dell.com>, |
| * Rob Radez <rob@osinvestor.com>, |
| * Greg Kroah-Hartman <greg@kroah.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor |
| * provide warranty for any of this software. This material is |
| * provided "AS-IS" and at no charge. |
| * |
| * Thanks also to Simon Machell at Berkshire Products Inc. for |
| * providing the test hardware. More info is available at |
| * http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
| */ |
| |
| #include <linux/module.h> /* For module specific items */ |
| #include <linux/moduleparam.h> /* For new moduleparam's */ |
| #include <linux/types.h> /* For standard types (like size_t) */ |
| #include <linux/errno.h> /* For the -ENODEV/... values */ |
| #include <linux/kernel.h> /* For printk/panic/... */ |
| #include <linux/delay.h> /* For mdelay function */ |
| #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ |
| #include <linux/watchdog.h> /* For the watchdog specific items */ |
| #include <linux/notifier.h> /* For notifier support */ |
| #include <linux/reboot.h> /* For reboot_notifier stuff */ |
| #include <linux/init.h> /* For __init/__exit/... */ |
| #include <linux/fs.h> /* For file operations */ |
| #include <linux/usb.h> /* For USB functions */ |
| #include <linux/slab.h> /* For kmalloc, ... */ |
| #include <linux/mutex.h> /* For mutex locking */ |
| #include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */ |
| |
| #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ |
| |
| |
| #ifdef CONFIG_USB_DEBUG |
| static int debug = 1; |
| #else |
| static int debug; |
| #endif |
| |
| /* Use our own dbg macro */ |
| #undef dbg |
| #define dbg(format, arg...) do { if (debug) printk(KERN_DEBUG PFX format "\n" , ## arg); } while (0) |
| |
| |
| /* Module and Version Information */ |
| #define DRIVER_VERSION "1.02" |
| #define DRIVER_DATE "06 Jan 2007" |
| #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" |
| #define DRIVER_DESC "Berkshire USB-PC Watchdog driver" |
| #define DRIVER_LICENSE "GPL" |
| #define DRIVER_NAME "pcwd_usb" |
| #define PFX DRIVER_NAME ": " |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE(DRIVER_LICENSE); |
| MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
| MODULE_ALIAS_MISCDEV(TEMP_MINOR); |
| |
| /* Module Parameters */ |
| module_param(debug, int, 0); |
| MODULE_PARM_DESC(debug, "Debug enabled or not"); |
| |
| #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ |
| static int heartbeat = WATCHDOG_HEARTBEAT; |
| module_param(heartbeat, int, 0); |
| MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
| |
| static int nowayout = WATCHDOG_NOWAYOUT; |
| module_param(nowayout, int, 0); |
| MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |
| |
| /* The vendor and product id's for the USB-PC Watchdog card */ |
| #define USB_PCWD_VENDOR_ID 0x0c98 |
| #define USB_PCWD_PRODUCT_ID 0x1140 |
| |
| /* table of devices that work with this driver */ |
| static struct usb_device_id usb_pcwd_table [] = { |
| { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, |
| { } /* Terminating entry */ |
| }; |
| MODULE_DEVICE_TABLE (usb, usb_pcwd_table); |
| |
| /* according to documentation max. time to process a command for the USB |
| * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ |
| #define USB_COMMAND_TIMEOUT 250 |
| |
| /* Watchdog's internal commands */ |
| #define CMD_READ_TEMP 0x02 /* Read Temperature; Re-trigger Watchdog */ |
| #define CMD_TRIGGER CMD_READ_TEMP |
| #define CMD_GET_STATUS 0x04 /* Get Status Information */ |
| #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ |
| #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ |
| #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ |
| #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current Watchdog Time */ |
| #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ |
| #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG |
| |
| /* Watchdog's Dip Switch heartbeat values */ |
| static const int heartbeat_tbl [] = { |
| 5, /* OFF-OFF-OFF = 5 Sec */ |
| 10, /* OFF-OFF-ON = 10 Sec */ |
| 30, /* OFF-ON-OFF = 30 Sec */ |
| 60, /* OFF-ON-ON = 1 Min */ |
| 300, /* ON-OFF-OFF = 5 Min */ |
| 600, /* ON-OFF-ON = 10 Min */ |
| 1800, /* ON-ON-OFF = 30 Min */ |
| 3600, /* ON-ON-ON = 1 hour */ |
| }; |
| |
| /* We can only use 1 card due to the /dev/watchdog restriction */ |
| static int cards_found; |
| |
| /* some internal variables */ |
| static unsigned long is_active; |
| static char expect_release; |
| |
| /* Structure to hold all of our device specific stuff */ |
| struct usb_pcwd_private { |
| struct usb_device * udev; /* save off the usb device pointer */ |
| struct usb_interface * interface; /* the interface for this device */ |
| |
| unsigned int interface_number; /* the interface number used for cmd's */ |
| |
| unsigned char * intr_buffer; /* the buffer to intr data */ |
| dma_addr_t intr_dma; /* the dma address for the intr buffer */ |
| size_t intr_size; /* the size of the intr buffer */ |
| struct urb * intr_urb; /* the urb used for the intr pipe */ |
| |
| unsigned char cmd_command; /* The command that is reported back */ |
| unsigned char cmd_data_msb; /* The data MSB that is reported back */ |
| unsigned char cmd_data_lsb; /* The data LSB that is reported back */ |
| atomic_t cmd_received; /* true if we received a report after a command */ |
| |
| int exists; /* Wether or not the device exists */ |
| struct semaphore sem; /* locks this structure */ |
| }; |
| static struct usb_pcwd_private *usb_pcwd_device; |
| |
| /* prevent races between open() and disconnect() */ |
| static DEFINE_MUTEX(disconnect_mutex); |
| |
| /* local function prototypes */ |
| static int usb_pcwd_probe (struct usb_interface *interface, const struct usb_device_id *id); |
| static void usb_pcwd_disconnect (struct usb_interface *interface); |
| |
| /* usb specific object needed to register this driver with the usb subsystem */ |
| static struct usb_driver usb_pcwd_driver = { |
| .name = DRIVER_NAME, |
| .probe = usb_pcwd_probe, |
| .disconnect = usb_pcwd_disconnect, |
| .id_table = usb_pcwd_table, |
| }; |
| |
| |
| static void usb_pcwd_intr_done(struct urb *urb) |
| { |
| struct usb_pcwd_private *usb_pcwd = (struct usb_pcwd_private *)urb->context; |
| unsigned char *data = usb_pcwd->intr_buffer; |
| int retval; |
| |
| switch (urb->status) { |
| case 0: /* success */ |
| break; |
| case -ECONNRESET: /* unlink */ |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* this urb is terminated, clean up */ |
| dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status); |
| return; |
| /* -EPIPE: should clear the halt */ |
| default: /* error */ |
| dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status); |
| goto resubmit; |
| } |
| |
| dbg("received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", |
| data[0], data[1], data[2]); |
| |
| usb_pcwd->cmd_command = data[0]; |
| usb_pcwd->cmd_data_msb = data[1]; |
| usb_pcwd->cmd_data_lsb = data[2]; |
| |
| /* notify anyone waiting that the cmd has finished */ |
| atomic_set (&usb_pcwd->cmd_received, 1); |
| |
| resubmit: |
| retval = usb_submit_urb (urb, GFP_ATOMIC); |
| if (retval) |
| printk(KERN_ERR PFX "can't resubmit intr, usb_submit_urb failed with result %d\n", |
| retval); |
| } |
| |
| static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, unsigned char cmd, |
| unsigned char *msb, unsigned char *lsb) |
| { |
| int got_response, count; |
| unsigned char buf[6]; |
| |
| /* We will not send any commands if the USB PCWD device does not exist */ |
| if ((!usb_pcwd) || (!usb_pcwd->exists)) |
| return -1; |
| |
| /* The USB PC Watchdog uses a 6 byte report format. The board currently uses |
| * only 3 of the six bytes of the report. */ |
| buf[0] = cmd; /* Byte 0 = CMD */ |
| buf[1] = *msb; /* Byte 1 = Data MSB */ |
| buf[2] = *lsb; /* Byte 2 = Data LSB */ |
| buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ |
| |
| dbg("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", |
| buf[0], buf[1], buf[2]); |
| |
| atomic_set (&usb_pcwd->cmd_received, 0); |
| |
| if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), |
| HID_REQ_SET_REPORT, HID_DT_REPORT, |
| 0x0200, usb_pcwd->interface_number, buf, sizeof(buf), |
| USB_COMMAND_TIMEOUT) != sizeof(buf)) { |
| dbg("usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", cmd, *msb, *lsb); |
| } |
| /* wait till the usb card processed the command, |
| * with a max. timeout of USB_COMMAND_TIMEOUT */ |
| got_response = 0; |
| for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); count++) { |
| mdelay(1); |
| if (atomic_read (&usb_pcwd->cmd_received)) |
| got_response = 1; |
| } |
| |
| if ((got_response) && (cmd == usb_pcwd->cmd_command)) { |
| /* read back response */ |
| *msb = usb_pcwd->cmd_data_msb; |
| *lsb = usb_pcwd->cmd_data_lsb; |
| } |
| |
| return got_response; |
| } |
| |
| static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) |
| { |
| unsigned char msb = 0x00; |
| unsigned char lsb = 0x00; |
| int retval; |
| |
| /* Enable Watchdog */ |
| retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, &msb, &lsb); |
| |
| if ((retval == 0) || (lsb == 0)) { |
| printk(KERN_ERR PFX "Card did not acknowledge enable attempt\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) |
| { |
| unsigned char msb = 0xA5; |
| unsigned char lsb = 0xC3; |
| int retval; |
| |
| /* Disable Watchdog */ |
| retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, &msb, &lsb); |
| |
| if ((retval == 0) || (lsb != 0)) { |
| printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) |
| { |
| unsigned char dummy; |
| |
| /* Re-trigger Watchdog */ |
| usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); |
| |
| return 0; |
| } |
| |
| static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) |
| { |
| unsigned char msb = t / 256; |
| unsigned char lsb = t % 256; |
| |
| if ((t < 0x0001) || (t > 0xFFFF)) |
| return -EINVAL; |
| |
| /* Write new heartbeat to watchdog */ |
| usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); |
| |
| heartbeat = t; |
| return 0; |
| } |
| |
| static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, int *temperature) |
| { |
| unsigned char msb, lsb; |
| |
| usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); |
| |
| /* |
| * Convert celsius to fahrenheit, since this was |
| * the decided 'standard' for this return value. |
| */ |
| *temperature = (lsb * 9 / 5) + 32; |
| |
| return 0; |
| } |
| |
| static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, int *time_left) |
| { |
| unsigned char msb, lsb; |
| |
| /* Read the time that's left before rebooting */ |
| /* Note: if the board is not yet armed then we will read 0xFFFF */ |
| usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); |
| |
| *time_left = (msb << 8) + lsb; |
| |
| return 0; |
| } |
| |
| /* |
| * /dev/watchdog handling |
| */ |
| |
| static ssize_t usb_pcwd_write(struct file *file, const char __user *data, |
| size_t len, loff_t *ppos) |
| { |
| /* See if we got the magic character 'V' and reload the timer */ |
| if (len) { |
| if (!nowayout) { |
| size_t i; |
| |
| /* note: just in case someone wrote the magic character |
| * five months ago... */ |
| expect_release = 0; |
| |
| /* scan to see whether or not we got the magic character */ |
| for (i = 0; i != len; i++) { |
| char c; |
| if(get_user(c, data+i)) |
| return -EFAULT; |
| if (c == 'V') |
| expect_release = 42; |
| } |
| } |
| |
| /* someone wrote to us, we should reload the timer */ |
| usb_pcwd_keepalive(usb_pcwd_device); |
| } |
| return len; |
| } |
| |
| static int usb_pcwd_ioctl(struct inode *inode, struct file *file, |
| unsigned int cmd, unsigned long arg) |
| { |
| void __user *argp = (void __user *)arg; |
| int __user *p = argp; |
| static struct watchdog_info ident = { |
| .options = WDIOF_KEEPALIVEPING | |
| WDIOF_SETTIMEOUT | |
| WDIOF_MAGICCLOSE, |
| .firmware_version = 1, |
| .identity = DRIVER_NAME, |
| }; |
| |
| switch (cmd) { |
| case WDIOC_GETSUPPORT: |
| return copy_to_user(argp, &ident, |
| sizeof (ident)) ? -EFAULT : 0; |
| |
| case WDIOC_GETSTATUS: |
| case WDIOC_GETBOOTSTATUS: |
| return put_user(0, p); |
| |
| case WDIOC_GETTEMP: |
| { |
| int temperature; |
| |
| if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
| return -EFAULT; |
| |
| return put_user(temperature, p); |
| } |
| |
| case WDIOC_KEEPALIVE: |
| usb_pcwd_keepalive(usb_pcwd_device); |
| return 0; |
| |
| case WDIOC_SETOPTIONS: |
| { |
| int new_options, retval = -EINVAL; |
| |
| if (get_user (new_options, p)) |
| return -EFAULT; |
| |
| if (new_options & WDIOS_DISABLECARD) { |
| usb_pcwd_stop(usb_pcwd_device); |
| retval = 0; |
| } |
| |
| if (new_options & WDIOS_ENABLECARD) { |
| usb_pcwd_start(usb_pcwd_device); |
| retval = 0; |
| } |
| |
| return retval; |
| } |
| |
| case WDIOC_SETTIMEOUT: |
| { |
| int new_heartbeat; |
| |
| if (get_user(new_heartbeat, p)) |
| return -EFAULT; |
| |
| if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) |
| return -EINVAL; |
| |
| usb_pcwd_keepalive(usb_pcwd_device); |
| /* Fall */ |
| } |
| |
| case WDIOC_GETTIMEOUT: |
| return put_user(heartbeat, p); |
| |
| case WDIOC_GETTIMELEFT: |
| { |
| int time_left; |
| |
| if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) |
| return -EFAULT; |
| |
| return put_user(time_left, p); |
| } |
| |
| default: |
| return -ENOTTY; |
| } |
| } |
| |
| static int usb_pcwd_open(struct inode *inode, struct file *file) |
| { |
| /* /dev/watchdog can only be opened once */ |
| if (test_and_set_bit(0, &is_active)) |
| return -EBUSY; |
| |
| /* Activate */ |
| usb_pcwd_start(usb_pcwd_device); |
| usb_pcwd_keepalive(usb_pcwd_device); |
| return nonseekable_open(inode, file); |
| } |
| |
| static int usb_pcwd_release(struct inode *inode, struct file *file) |
| { |
| /* |
| * Shut off the timer. |
| */ |
| if (expect_release == 42) { |
| usb_pcwd_stop(usb_pcwd_device); |
| } else { |
| printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); |
| usb_pcwd_keepalive(usb_pcwd_device); |
| } |
| expect_release = 0; |
| clear_bit(0, &is_active); |
| return 0; |
| } |
| |
| /* |
| * /dev/temperature handling |
| */ |
| |
| static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, |
| size_t len, loff_t *ppos) |
| { |
| int temperature; |
| |
| if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
| return -EFAULT; |
| |
| if (copy_to_user(data, &temperature, 1)) |
| return -EFAULT; |
| |
| return 1; |
| } |
| |
| static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) |
| { |
| return nonseekable_open(inode, file); |
| } |
| |
| static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) |
| { |
| return 0; |
| } |
| |
| /* |
| * Notify system |
| */ |
| |
| static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) |
| { |
| if (code==SYS_DOWN || code==SYS_HALT) { |
| /* Turn the WDT off */ |
| usb_pcwd_stop(usb_pcwd_device); |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| /* |
| * Kernel Interfaces |
| */ |
| |
| static const struct file_operations usb_pcwd_fops = { |
| .owner = THIS_MODULE, |
| .llseek = no_llseek, |
| .write = usb_pcwd_write, |
| .ioctl = usb_pcwd_ioctl, |
| .open = usb_pcwd_open, |
| .release = usb_pcwd_release, |
| }; |
| |
| static struct miscdevice usb_pcwd_miscdev = { |
| .minor = WATCHDOG_MINOR, |
| .name = "watchdog", |
| .fops = &usb_pcwd_fops, |
| }; |
| |
| static const struct file_operations usb_pcwd_temperature_fops = { |
| .owner = THIS_MODULE, |
| .llseek = no_llseek, |
| .read = usb_pcwd_temperature_read, |
| .open = usb_pcwd_temperature_open, |
| .release = usb_pcwd_temperature_release, |
| }; |
| |
| static struct miscdevice usb_pcwd_temperature_miscdev = { |
| .minor = TEMP_MINOR, |
| .name = "temperature", |
| .fops = &usb_pcwd_temperature_fops, |
| }; |
| |
| static struct notifier_block usb_pcwd_notifier = { |
| .notifier_call = usb_pcwd_notify_sys, |
| }; |
| |
| /** |
| * usb_pcwd_delete |
| */ |
| static inline void usb_pcwd_delete (struct usb_pcwd_private *usb_pcwd) |
| { |
| usb_free_urb(usb_pcwd->intr_urb); |
| if (usb_pcwd->intr_buffer != NULL) |
| usb_buffer_free(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, maxp; |
| 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) { |
| printk(KERN_ERR PFX "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)) { |
| printk(KERN_ERR PFX "The device isn't a Human Interface Device\n"); |
| return -ENODEV; |
| } |
| |
| /* check out the endpoint: it has to be Interrupt & IN */ |
| endpoint = &iface_desc->endpoint[0].desc; |
| |
| if (!((endpoint->bEndpointAddress & USB_DIR_IN) && |
| ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) |
| == USB_ENDPOINT_XFER_INT))) { |
| /* we didn't find a Interrupt endpoint with direction IN */ |
| printk(KERN_ERR PFX "Couldn't find an INTR & IN endpoint\n"); |
| return -ENODEV; |
| } |
| |
| /* get a handle to the interrupt data pipe */ |
| pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); |
| maxp = usb_maxpacket(udev, pipe, usb_pipeout(pipe)); |
| |
| /* allocate memory for our device and initialize it */ |
| usb_pcwd = kmalloc (sizeof(struct usb_pcwd_private), GFP_KERNEL); |
| if (usb_pcwd == NULL) { |
| printk(KERN_ERR PFX "Out of memory\n"); |
| goto error; |
| } |
| memset (usb_pcwd, 0x00, sizeof (*usb_pcwd)); |
| |
| usb_pcwd_device = usb_pcwd; |
| |
| init_MUTEX (&usb_pcwd->sem); |
| 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 */ |
| if (!(usb_pcwd->intr_buffer = usb_buffer_alloc(udev, usb_pcwd->intr_size, GFP_ATOMIC, &usb_pcwd->intr_dma))) { |
| printk(KERN_ERR PFX "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) { |
| printk(KERN_ERR PFX "Out of memory\n"); |
| 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)) { |
| printk(KERN_ERR PFX "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>"); |
| } |
| |
| printk(KERN_INFO PFX "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); |
| |
| printk(KERN_INFO PFX "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); |
| printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", |
| WATCHDOG_HEARTBEAT); |
| } |
| |
| retval = register_reboot_notifier(&usb_pcwd_notifier); |
| if (retval != 0) { |
| printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", |
| retval); |
| goto error; |
| } |
| |
| retval = misc_register(&usb_pcwd_temperature_miscdev); |
| if (retval != 0) { |
| printk(KERN_ERR PFX "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) { |
| printk(KERN_ERR PFX "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); |
| |
| printk(KERN_INFO PFX "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); |
| |
| down (&usb_pcwd->sem); |
| |
| /* 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); |
| |
| up (&usb_pcwd->sem); |
| |
| /* Delete the USB PCWD device */ |
| usb_pcwd_delete(usb_pcwd); |
| |
| cards_found--; |
| |
| mutex_unlock(&disconnect_mutex); |
| |
| printk(KERN_INFO PFX "USB PC Watchdog disconnected\n"); |
| } |
| |
| |
| |
| /** |
| * usb_pcwd_init |
| */ |
| static int __init usb_pcwd_init(void) |
| { |
| int result; |
| |
| /* register this driver with the USB subsystem */ |
| result = usb_register(&usb_pcwd_driver); |
| if (result) { |
| printk(KERN_ERR PFX "usb_register failed. Error number %d\n", |
| result); |
| return result; |
| } |
| |
| printk(KERN_INFO PFX DRIVER_DESC " v" DRIVER_VERSION " (" DRIVER_DATE ")\n"); |
| return 0; |
| } |
| |
| |
| /** |
| * usb_pcwd_exit |
| */ |
| static void __exit usb_pcwd_exit(void) |
| { |
| /* deregister this driver with the USB subsystem */ |
| usb_deregister(&usb_pcwd_driver); |
| } |
| |
| |
| module_init (usb_pcwd_init); |
| module_exit (usb_pcwd_exit); |