Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Berkshire USB-PC Watchdog Card Driver |
| 3 | * |
Wim Van Sebroeck | 2ef473d | 2007-01-08 22:45:30 +0100 | [diff] [blame] | 4 | * (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * Based on source code of the following authors: |
| 7 | * Ken Hollis <kenji@bitgate.com>, |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 8 | * Alan Cox <alan@lxorguk.ukuu.org.uk>, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Matt Domsch <Matt_Domsch@dell.com>, |
| 10 | * Rob Radez <rob@osinvestor.com>, |
| 11 | * Greg Kroah-Hartman <greg@kroah.com> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | * |
| 18 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor |
| 19 | * provide warranty for any of this software. This material is |
| 20 | * provided "AS-IS" and at no charge. |
| 21 | * |
| 22 | * Thanks also to Simon Machell at Berkshire Products Inc. for |
| 23 | * providing the test hardware. More info is available at |
| 24 | * http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
| 25 | */ |
| 26 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 27 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 28 | |
Wim Van Sebroeck | d26d909 | 2007-01-08 22:40:33 +0100 | [diff] [blame] | 29 | #include <linux/module.h> /* For module specific items */ |
| 30 | #include <linux/moduleparam.h> /* For new moduleparam's */ |
| 31 | #include <linux/types.h> /* For standard types (like size_t) */ |
| 32 | #include <linux/errno.h> /* For the -ENODEV/... values */ |
| 33 | #include <linux/kernel.h> /* For printk/panic/... */ |
| 34 | #include <linux/delay.h> /* For mdelay function */ |
Jean Delvare | 487722c | 2013-10-21 17:38:49 +0200 | [diff] [blame] | 35 | #include <linux/miscdevice.h> /* For struct miscdevice */ |
Wim Van Sebroeck | d26d909 | 2007-01-08 22:40:33 +0100 | [diff] [blame] | 36 | #include <linux/watchdog.h> /* For the watchdog specific items */ |
| 37 | #include <linux/notifier.h> /* For notifier support */ |
| 38 | #include <linux/reboot.h> /* For reboot_notifier stuff */ |
| 39 | #include <linux/init.h> /* For __init/__exit/... */ |
| 40 | #include <linux/fs.h> /* For file operations */ |
| 41 | #include <linux/usb.h> /* For USB functions */ |
| 42 | #include <linux/slab.h> /* For kmalloc, ... */ |
| 43 | #include <linux/mutex.h> /* For mutex locking */ |
Wim Van Sebroeck | d4b8759 | 2006-12-12 23:46:47 +0100 | [diff] [blame] | 44 | #include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */ |
Wim Van Sebroeck | 089ab07 | 2008-07-15 11:46:11 +0000 | [diff] [blame] | 45 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
Wim Van Sebroeck | d26d909 | 2007-01-08 22:40:33 +0100 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | /* Module and Version Information */ |
Wim Van Sebroeck | 2ef473d | 2007-01-08 22:45:30 +0100 | [diff] [blame] | 49 | #define DRIVER_VERSION "1.02" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>" |
| 51 | #define DRIVER_DESC "Berkshire USB-PC Watchdog driver" |
| 52 | #define DRIVER_LICENSE "GPL" |
| 53 | #define DRIVER_NAME "pcwd_usb" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
| 55 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 56 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 57 | MODULE_LICENSE(DRIVER_LICENSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 59 | #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = |
| 60 | delay-time from dip-switches */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static int heartbeat = WATCHDOG_HEARTBEAT; |
| 62 | module_param(heartbeat, int, 0); |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 63 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
| 64 | "(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" |
| 65 | __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 67 | static bool nowayout = WATCHDOG_NOWAYOUT; |
| 68 | module_param(nowayout, bool, 0); |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 69 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
| 70 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | /* The vendor and product id's for the USB-PC Watchdog card */ |
| 73 | #define USB_PCWD_VENDOR_ID 0x0c98 |
| 74 | #define USB_PCWD_PRODUCT_ID 0x1140 |
| 75 | |
| 76 | /* table of devices that work with this driver */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 77 | static struct usb_device_id usb_pcwd_table[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) }, |
| 79 | { } /* Terminating entry */ |
| 80 | }; |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 81 | MODULE_DEVICE_TABLE(usb, usb_pcwd_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | /* according to documentation max. time to process a command for the USB |
| 84 | * watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */ |
| 85 | #define USB_COMMAND_TIMEOUT 250 |
| 86 | |
| 87 | /* Watchdog's internal commands */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 88 | #define CMD_READ_TEMP 0x02 /* Read Temperature; |
| 89 | Re-trigger Watchdog */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | #define CMD_TRIGGER CMD_READ_TEMP |
| 91 | #define CMD_GET_STATUS 0x04 /* Get Status Information */ |
| 92 | #define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */ |
| 93 | #define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */ |
| 94 | #define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 95 | #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current WatchdogTime */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */ |
| 97 | #define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG |
| 98 | |
Wim Van Sebroeck | 2ef473d | 2007-01-08 22:45:30 +0100 | [diff] [blame] | 99 | /* Watchdog's Dip Switch heartbeat values */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 100 | static const int heartbeat_tbl[] = { |
Wim Van Sebroeck | 2ef473d | 2007-01-08 22:45:30 +0100 | [diff] [blame] | 101 | 5, /* OFF-OFF-OFF = 5 Sec */ |
| 102 | 10, /* OFF-OFF-ON = 10 Sec */ |
| 103 | 30, /* OFF-ON-OFF = 30 Sec */ |
| 104 | 60, /* OFF-ON-ON = 1 Min */ |
| 105 | 300, /* ON-OFF-OFF = 5 Min */ |
| 106 | 600, /* ON-OFF-ON = 10 Min */ |
| 107 | 1800, /* ON-ON-OFF = 30 Min */ |
| 108 | 3600, /* ON-ON-ON = 1 hour */ |
| 109 | }; |
| 110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
| 112 | static int cards_found; |
| 113 | |
| 114 | /* some internal variables */ |
| 115 | static unsigned long is_active; |
| 116 | static char expect_release; |
| 117 | |
| 118 | /* Structure to hold all of our device specific stuff */ |
| 119 | struct usb_pcwd_private { |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 120 | /* save off the usb device pointer */ |
| 121 | struct usb_device *udev; |
| 122 | /* the interface for this device */ |
| 123 | struct usb_interface *interface; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 125 | /* the interface number used for cmd's */ |
| 126 | unsigned int interface_number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 128 | /* the buffer to intr data */ |
| 129 | unsigned char *intr_buffer; |
| 130 | /* the dma address for the intr buffer */ |
| 131 | dma_addr_t intr_dma; |
| 132 | /* the size of the intr buffer */ |
| 133 | size_t intr_size; |
| 134 | /* the urb used for the intr pipe */ |
| 135 | struct urb *intr_urb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 137 | /* The command that is reported back */ |
| 138 | unsigned char cmd_command; |
| 139 | /* The data MSB that is reported back */ |
| 140 | unsigned char cmd_data_msb; |
| 141 | /* The data LSB that is reported back */ |
| 142 | unsigned char cmd_data_lsb; |
| 143 | /* true if we received a report after a command */ |
| 144 | atomic_t cmd_received; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 146 | /* Wether or not the device exists */ |
| 147 | int exists; |
| 148 | /* locks this structure */ |
| 149 | struct mutex mtx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | }; |
| 151 | static struct usb_pcwd_private *usb_pcwd_device; |
| 152 | |
| 153 | /* prevent races between open() and disconnect() */ |
Ingo Molnar | 6f87f0d | 2006-03-23 03:00:27 -0800 | [diff] [blame] | 154 | static DEFINE_MUTEX(disconnect_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
| 156 | /* local function prototypes */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 157 | static int usb_pcwd_probe(struct usb_interface *interface, |
| 158 | const struct usb_device_id *id); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 159 | static void usb_pcwd_disconnect(struct usb_interface *interface); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | /* usb specific object needed to register this driver with the usb subsystem */ |
| 162 | static struct usb_driver usb_pcwd_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | .name = DRIVER_NAME, |
| 164 | .probe = usb_pcwd_probe, |
| 165 | .disconnect = usb_pcwd_disconnect, |
| 166 | .id_table = usb_pcwd_table, |
| 167 | }; |
| 168 | |
| 169 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 170 | static void usb_pcwd_intr_done(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 172 | struct usb_pcwd_private *usb_pcwd = |
| 173 | (struct usb_pcwd_private *)urb->context; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | unsigned char *data = usb_pcwd->intr_buffer; |
Greg Kroah-Hartman | d7e92f7 | 2013-12-19 15:44:10 -0800 | [diff] [blame] | 175 | struct device *dev = &usb_pcwd->interface->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | int retval; |
| 177 | |
| 178 | switch (urb->status) { |
| 179 | case 0: /* success */ |
| 180 | break; |
| 181 | case -ECONNRESET: /* unlink */ |
| 182 | case -ENOENT: |
| 183 | case -ESHUTDOWN: |
| 184 | /* this urb is terminated, clean up */ |
Greg Kroah-Hartman | d7e92f7 | 2013-12-19 15:44:10 -0800 | [diff] [blame] | 185 | dev_dbg(dev, "%s - urb shutting down with status: %d", |
| 186 | __func__, urb->status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | return; |
| 188 | /* -EPIPE: should clear the halt */ |
| 189 | default: /* error */ |
Greg Kroah-Hartman | d7e92f7 | 2013-12-19 15:44:10 -0800 | [diff] [blame] | 190 | dev_dbg(dev, "%s - nonzero urb status received: %d", |
| 191 | __func__, urb->status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | goto resubmit; |
| 193 | } |
| 194 | |
Greg Kroah-Hartman | d7e92f7 | 2013-12-19 15:44:10 -0800 | [diff] [blame] | 195 | dev_dbg(dev, "received following data cmd=0x%02x msb=0x%02x lsb=0x%02x", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | data[0], data[1], data[2]); |
| 197 | |
| 198 | usb_pcwd->cmd_command = data[0]; |
| 199 | usb_pcwd->cmd_data_msb = data[1]; |
| 200 | usb_pcwd->cmd_data_lsb = data[2]; |
| 201 | |
| 202 | /* notify anyone waiting that the cmd has finished */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 203 | atomic_set(&usb_pcwd->cmd_received, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | resubmit: |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 206 | retval = usb_submit_urb(urb, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (retval) |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 208 | pr_err("can't resubmit intr, usb_submit_urb failed with result %d\n", |
| 209 | retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 212 | static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd, |
| 213 | unsigned char cmd, unsigned char *msb, unsigned char *lsb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
| 215 | int got_response, count; |
Guenter Roeck | 5412df0 | 2013-10-14 09:29:34 -0700 | [diff] [blame] | 216 | unsigned char *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 218 | /* We will not send any commands if the USB PCWD device does |
| 219 | * not exist */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | if ((!usb_pcwd) || (!usb_pcwd->exists)) |
| 221 | return -1; |
| 222 | |
Guenter Roeck | 5412df0 | 2013-10-14 09:29:34 -0700 | [diff] [blame] | 223 | buf = kmalloc(6, GFP_KERNEL); |
| 224 | if (buf == NULL) |
| 225 | return 0; |
| 226 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 227 | /* The USB PC Watchdog uses a 6 byte report format. |
| 228 | * The board currently uses only 3 of the six bytes of the report. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | buf[0] = cmd; /* Byte 0 = CMD */ |
| 230 | buf[1] = *msb; /* Byte 1 = Data MSB */ |
| 231 | buf[2] = *lsb; /* Byte 2 = Data LSB */ |
| 232 | buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */ |
| 233 | |
Greg Kroah-Hartman | d7e92f7 | 2013-12-19 15:44:10 -0800 | [diff] [blame] | 234 | dev_dbg(&usb_pcwd->interface->dev, |
| 235 | "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | buf[0], buf[1], buf[2]); |
| 237 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 238 | atomic_set(&usb_pcwd->cmd_received, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0), |
| 241 | HID_REQ_SET_REPORT, HID_DT_REPORT, |
Dan Carpenter | ab5bbdc | 2013-11-08 01:24:19 -0800 | [diff] [blame] | 242 | 0x0200, usb_pcwd->interface_number, buf, 6, |
| 243 | USB_COMMAND_TIMEOUT) != 6) { |
Greg Kroah-Hartman | d7e92f7 | 2013-12-19 15:44:10 -0800 | [diff] [blame] | 244 | dev_dbg(&usb_pcwd->interface->dev, |
| 245 | "usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n", |
| 246 | cmd, *msb, *lsb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | /* wait till the usb card processed the command, |
| 249 | * with a max. timeout of USB_COMMAND_TIMEOUT */ |
| 250 | got_response = 0; |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 251 | for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response); |
| 252 | count++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | mdelay(1); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 254 | if (atomic_read(&usb_pcwd->cmd_received)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | got_response = 1; |
| 256 | } |
| 257 | |
| 258 | if ((got_response) && (cmd == usb_pcwd->cmd_command)) { |
| 259 | /* read back response */ |
| 260 | *msb = usb_pcwd->cmd_data_msb; |
| 261 | *lsb = usb_pcwd->cmd_data_lsb; |
| 262 | } |
| 263 | |
Guenter Roeck | 5412df0 | 2013-10-14 09:29:34 -0700 | [diff] [blame] | 264 | kfree(buf); |
| 265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | return got_response; |
| 267 | } |
| 268 | |
| 269 | static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd) |
| 270 | { |
| 271 | unsigned char msb = 0x00; |
| 272 | unsigned char lsb = 0x00; |
| 273 | int retval; |
| 274 | |
| 275 | /* Enable Watchdog */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 276 | retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG, |
| 277 | &msb, &lsb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
| 279 | if ((retval == 0) || (lsb == 0)) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 280 | pr_err("Card did not acknowledge enable attempt\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return -1; |
| 282 | } |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd) |
| 288 | { |
| 289 | unsigned char msb = 0xA5; |
| 290 | unsigned char lsb = 0xC3; |
| 291 | int retval; |
| 292 | |
| 293 | /* Disable Watchdog */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 294 | retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG, |
| 295 | &msb, &lsb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
| 297 | if ((retval == 0) || (lsb != 0)) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 298 | pr_err("Card did not acknowledge disable attempt\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | return -1; |
| 300 | } |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd) |
| 306 | { |
| 307 | unsigned char dummy; |
| 308 | |
| 309 | /* Re-trigger Watchdog */ |
| 310 | usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy); |
| 311 | |
| 312 | return 0; |
| 313 | } |
| 314 | |
| 315 | static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t) |
| 316 | { |
| 317 | unsigned char msb = t / 256; |
| 318 | unsigned char lsb = t % 256; |
| 319 | |
| 320 | if ((t < 0x0001) || (t > 0xFFFF)) |
| 321 | return -EINVAL; |
| 322 | |
| 323 | /* Write new heartbeat to watchdog */ |
| 324 | usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb); |
| 325 | |
| 326 | heartbeat = t; |
| 327 | return 0; |
| 328 | } |
| 329 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 330 | static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd, |
| 331 | int *temperature) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | { |
| 333 | unsigned char msb, lsb; |
| 334 | |
| 335 | usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb); |
| 336 | |
| 337 | /* |
| 338 | * Convert celsius to fahrenheit, since this was |
| 339 | * the decided 'standard' for this return value. |
| 340 | */ |
| 341 | *temperature = (lsb * 9 / 5) + 32; |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 346 | static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd, |
| 347 | int *time_left) |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 348 | { |
| 349 | unsigned char msb, lsb; |
| 350 | |
| 351 | /* Read the time that's left before rebooting */ |
| 352 | /* Note: if the board is not yet armed then we will read 0xFFFF */ |
| 353 | usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); |
| 354 | |
| 355 | *time_left = (msb << 8) + lsb; |
| 356 | |
| 357 | return 0; |
| 358 | } |
| 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | /* |
| 361 | * /dev/watchdog handling |
| 362 | */ |
| 363 | |
| 364 | static ssize_t usb_pcwd_write(struct file *file, const char __user *data, |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 365 | size_t len, loff_t *ppos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | { |
| 367 | /* See if we got the magic character 'V' and reload the timer */ |
| 368 | if (len) { |
| 369 | if (!nowayout) { |
| 370 | size_t i; |
| 371 | |
| 372 | /* note: just in case someone wrote the magic character |
| 373 | * five months ago... */ |
| 374 | expect_release = 0; |
| 375 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 376 | /* scan to see whether or not we got the |
| 377 | * magic character */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | for (i = 0; i != len; i++) { |
| 379 | char c; |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 380 | if (get_user(c, data + i)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | return -EFAULT; |
| 382 | if (c == 'V') |
| 383 | expect_release = 42; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | /* someone wrote to us, we should reload the timer */ |
| 388 | usb_pcwd_keepalive(usb_pcwd_device); |
| 389 | } |
| 390 | return len; |
| 391 | } |
| 392 | |
Alan Cox | c948852 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 393 | static long usb_pcwd_ioctl(struct file *file, unsigned int cmd, |
| 394 | unsigned long arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | { |
| 396 | void __user *argp = (void __user *)arg; |
| 397 | int __user *p = argp; |
Wim Van Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 398 | static const struct watchdog_info ident = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | .options = WDIOF_KEEPALIVEPING | |
| 400 | WDIOF_SETTIMEOUT | |
| 401 | WDIOF_MAGICCLOSE, |
| 402 | .firmware_version = 1, |
| 403 | .identity = DRIVER_NAME, |
| 404 | }; |
| 405 | |
| 406 | switch (cmd) { |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 407 | case WDIOC_GETSUPPORT: |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 408 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 410 | case WDIOC_GETSTATUS: |
| 411 | case WDIOC_GETBOOTSTATUS: |
| 412 | return put_user(0, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 414 | case WDIOC_GETTEMP: |
| 415 | { |
| 416 | int temperature; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 418 | if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
| 419 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 421 | return put_user(temperature, p); |
| 422 | } |
| 423 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 424 | case WDIOC_SETOPTIONS: |
| 425 | { |
| 426 | int new_options, retval = -EINVAL; |
| 427 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 428 | if (get_user(new_options, p)) |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 429 | return -EFAULT; |
| 430 | |
| 431 | if (new_options & WDIOS_DISABLECARD) { |
| 432 | usb_pcwd_stop(usb_pcwd_device); |
| 433 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | } |
| 435 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 436 | if (new_options & WDIOS_ENABLECARD) { |
| 437 | usb_pcwd_start(usb_pcwd_device); |
| 438 | retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 441 | return retval; |
| 442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | |
Wim Van Sebroeck | 0c06090c | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 444 | case WDIOC_KEEPALIVE: |
| 445 | usb_pcwd_keepalive(usb_pcwd_device); |
| 446 | return 0; |
| 447 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 448 | case WDIOC_SETTIMEOUT: |
| 449 | { |
| 450 | int new_heartbeat; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 452 | if (get_user(new_heartbeat, p)) |
| 453 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 455 | if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat)) |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 456 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 458 | usb_pcwd_keepalive(usb_pcwd_device); |
| 459 | /* Fall */ |
| 460 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 462 | case WDIOC_GETTIMEOUT: |
| 463 | return put_user(heartbeat, p); |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 464 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 465 | case WDIOC_GETTIMELEFT: |
| 466 | { |
| 467 | int time_left; |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 468 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 469 | if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left)) |
| 470 | return -EFAULT; |
Wim Van Sebroeck | 58b519f | 2006-05-21 12:48:44 +0200 | [diff] [blame] | 471 | |
Wim Van Sebroeck | 5eb8249 | 2008-07-17 18:08:47 +0000 | [diff] [blame] | 472 | return put_user(time_left, p); |
| 473 | } |
| 474 | |
| 475 | default: |
| 476 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | } |
| 478 | } |
| 479 | |
| 480 | static int usb_pcwd_open(struct inode *inode, struct file *file) |
| 481 | { |
| 482 | /* /dev/watchdog can only be opened once */ |
| 483 | if (test_and_set_bit(0, &is_active)) |
| 484 | return -EBUSY; |
| 485 | |
| 486 | /* Activate */ |
| 487 | usb_pcwd_start(usb_pcwd_device); |
| 488 | usb_pcwd_keepalive(usb_pcwd_device); |
| 489 | return nonseekable_open(inode, file); |
| 490 | } |
| 491 | |
| 492 | static int usb_pcwd_release(struct inode *inode, struct file *file) |
| 493 | { |
| 494 | /* |
| 495 | * Shut off the timer. |
| 496 | */ |
| 497 | if (expect_release == 42) { |
| 498 | usb_pcwd_stop(usb_pcwd_device); |
| 499 | } else { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 500 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | usb_pcwd_keepalive(usb_pcwd_device); |
| 502 | } |
| 503 | expect_release = 0; |
| 504 | clear_bit(0, &is_active); |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * /dev/temperature handling |
| 510 | */ |
| 511 | |
| 512 | static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data, |
| 513 | size_t len, loff_t *ppos) |
| 514 | { |
| 515 | int temperature; |
| 516 | |
| 517 | if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature)) |
| 518 | return -EFAULT; |
| 519 | |
| 520 | if (copy_to_user(data, &temperature, 1)) |
| 521 | return -EFAULT; |
| 522 | |
| 523 | return 1; |
| 524 | } |
| 525 | |
| 526 | static int usb_pcwd_temperature_open(struct inode *inode, struct file *file) |
| 527 | { |
| 528 | return nonseekable_open(inode, file); |
| 529 | } |
| 530 | |
| 531 | static int usb_pcwd_temperature_release(struct inode *inode, struct file *file) |
| 532 | { |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Notify system |
| 538 | */ |
| 539 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 540 | static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code, |
| 541 | void *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 543 | if (code == SYS_DOWN || code == SYS_HALT) |
| 544 | usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | return NOTIFY_DONE; |
| 547 | } |
| 548 | |
| 549 | /* |
| 550 | * Kernel Interfaces |
| 551 | */ |
| 552 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 553 | static const struct file_operations usb_pcwd_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | .owner = THIS_MODULE, |
| 555 | .llseek = no_llseek, |
| 556 | .write = usb_pcwd_write, |
Alan Cox | c948852 | 2008-07-03 23:51:32 -0700 | [diff] [blame] | 557 | .unlocked_ioctl = usb_pcwd_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | .open = usb_pcwd_open, |
| 559 | .release = usb_pcwd_release, |
| 560 | }; |
| 561 | |
| 562 | static struct miscdevice usb_pcwd_miscdev = { |
| 563 | .minor = WATCHDOG_MINOR, |
| 564 | .name = "watchdog", |
| 565 | .fops = &usb_pcwd_fops, |
| 566 | }; |
| 567 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 568 | static const struct file_operations usb_pcwd_temperature_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | .owner = THIS_MODULE, |
| 570 | .llseek = no_llseek, |
| 571 | .read = usb_pcwd_temperature_read, |
| 572 | .open = usb_pcwd_temperature_open, |
| 573 | .release = usb_pcwd_temperature_release, |
| 574 | }; |
| 575 | |
| 576 | static struct miscdevice usb_pcwd_temperature_miscdev = { |
| 577 | .minor = TEMP_MINOR, |
| 578 | .name = "temperature", |
| 579 | .fops = &usb_pcwd_temperature_fops, |
| 580 | }; |
| 581 | |
| 582 | static struct notifier_block usb_pcwd_notifier = { |
| 583 | .notifier_call = usb_pcwd_notify_sys, |
| 584 | }; |
| 585 | |
| 586 | /** |
| 587 | * usb_pcwd_delete |
| 588 | */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 589 | static inline void usb_pcwd_delete(struct usb_pcwd_private *usb_pcwd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | { |
Mariusz Kozlowski | 6265d62 | 2006-11-08 15:34:02 +0100 | [diff] [blame] | 591 | usb_free_urb(usb_pcwd->intr_urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | if (usb_pcwd->intr_buffer != NULL) |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 593 | usb_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size, |
| 594 | usb_pcwd->intr_buffer, usb_pcwd->intr_dma); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 595 | kfree(usb_pcwd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | } |
| 597 | |
| 598 | /** |
| 599 | * usb_pcwd_probe |
| 600 | * |
| 601 | * Called by the usb core when a new device is connected that it thinks |
| 602 | * this driver might be interested in. |
| 603 | */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 604 | static int usb_pcwd_probe(struct usb_interface *interface, |
| 605 | const struct usb_device_id *id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
| 607 | struct usb_device *udev = interface_to_usbdev(interface); |
| 608 | struct usb_host_interface *iface_desc; |
| 609 | struct usb_endpoint_descriptor *endpoint; |
| 610 | struct usb_pcwd_private *usb_pcwd = NULL; |
Tomas Winkler | 99f08ca | 2016-01-19 15:51:04 +0200 | [diff] [blame] | 611 | int pipe; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | int retval = -ENOMEM; |
| 613 | int got_fw_rev; |
| 614 | unsigned char fw_rev_major, fw_rev_minor; |
| 615 | char fw_ver_str[20]; |
| 616 | unsigned char option_switches, dummy; |
| 617 | |
| 618 | cards_found++; |
| 619 | if (cards_found > 1) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 620 | pr_err("This driver only supports 1 device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return -ENODEV; |
| 622 | } |
| 623 | |
| 624 | /* get the active interface descriptor */ |
| 625 | iface_desc = interface->cur_altsetting; |
| 626 | |
| 627 | /* check out that we have a HID device */ |
| 628 | if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 629 | pr_err("The device isn't a Human Interface Device\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | return -ENODEV; |
| 631 | } |
| 632 | |
| 633 | /* check out the endpoint: it has to be Interrupt & IN */ |
| 634 | endpoint = &iface_desc->endpoint[0].desc; |
| 635 | |
Julia Lawall | 2855d28 | 2008-12-29 11:23:47 +0100 | [diff] [blame] | 636 | if (!usb_endpoint_is_int_in(endpoint)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | /* we didn't find a Interrupt endpoint with direction IN */ |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 638 | pr_err("Couldn't find an INTR & IN endpoint\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | return -ENODEV; |
| 640 | } |
| 641 | |
| 642 | /* get a handle to the interrupt data pipe */ |
| 643 | pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | |
| 645 | /* allocate memory for our device and initialize it */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 646 | usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL); |
Jingoo Han | 8deea83 | 2014-02-11 15:46:43 +0900 | [diff] [blame] | 647 | if (usb_pcwd == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
| 650 | usb_pcwd_device = usb_pcwd; |
| 651 | |
Matthias Kaehlcke | 9f7afa6 | 2007-05-03 20:15:14 -0700 | [diff] [blame] | 652 | mutex_init(&usb_pcwd->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | usb_pcwd->udev = udev; |
| 654 | usb_pcwd->interface = interface; |
| 655 | usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber; |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 656 | usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ? |
| 657 | le16_to_cpu(endpoint->wMaxPacketSize) : 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
| 659 | /* set up the memory buffer's */ |
Daniel Mack | 997ea58 | 2010-04-12 13:17:25 +0200 | [diff] [blame] | 660 | usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size, |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 661 | GFP_ATOMIC, &usb_pcwd->intr_dma); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 662 | if (!usb_pcwd->intr_buffer) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 663 | pr_err("Out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | goto error; |
| 665 | } |
| 666 | |
| 667 | /* allocate the urb's */ |
| 668 | usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL); |
| 669 | if (!usb_pcwd->intr_urb) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 670 | pr_err("Out of memory\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | goto error; |
| 672 | } |
| 673 | |
| 674 | /* initialise the intr urb's */ |
| 675 | usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe, |
| 676 | usb_pcwd->intr_buffer, usb_pcwd->intr_size, |
| 677 | usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval); |
| 678 | usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma; |
| 679 | usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| 680 | |
| 681 | /* register our interrupt URB with the USB system */ |
| 682 | if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 683 | pr_err("Problem registering interrupt URB\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | retval = -EIO; /* failure */ |
| 685 | goto error; |
| 686 | } |
| 687 | |
| 688 | /* The device exists and can be communicated with */ |
| 689 | usb_pcwd->exists = 1; |
| 690 | |
| 691 | /* disable card */ |
| 692 | usb_pcwd_stop(usb_pcwd); |
| 693 | |
| 694 | /* Get the Firmware Version */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 695 | got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION, |
| 696 | &fw_rev_major, &fw_rev_minor); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 697 | if (got_fw_rev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 699 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | sprintf(fw_ver_str, "<card no answer>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 702 | pr_info("Found card (Firmware: %s) with temp option\n", fw_ver_str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | |
| 704 | /* Get switch settings */ |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 705 | usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy, |
| 706 | &option_switches); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 708 | pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | option_switches, |
| 710 | ((option_switches & 0x10) ? "ON" : "OFF"), |
| 711 | ((option_switches & 0x08) ? "ON" : "OFF")); |
| 712 | |
Wim Van Sebroeck | 2ef473d | 2007-01-08 22:45:30 +0100 | [diff] [blame] | 713 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
| 714 | if (heartbeat == 0) |
| 715 | heartbeat = heartbeat_tbl[(option_switches & 0x07)]; |
| 716 | |
Wim Van Sebroeck | 143a2e5 | 2009-03-18 08:35:09 +0000 | [diff] [blame] | 717 | /* Check that the heartbeat value is within it's range ; |
| 718 | * if not reset to the default */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) { |
| 720 | usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT); |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 721 | pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | WATCHDOG_HEARTBEAT); |
| 723 | } |
| 724 | |
| 725 | retval = register_reboot_notifier(&usb_pcwd_notifier); |
| 726 | if (retval != 0) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 727 | pr_err("cannot register reboot notifier (err=%d)\n", retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | goto error; |
| 729 | } |
| 730 | |
| 731 | retval = misc_register(&usb_pcwd_temperature_miscdev); |
| 732 | if (retval != 0) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 733 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
| 734 | TEMP_MINOR, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | goto err_out_unregister_reboot; |
| 736 | } |
| 737 | |
| 738 | retval = misc_register(&usb_pcwd_miscdev); |
| 739 | if (retval != 0) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 740 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
| 741 | WATCHDOG_MINOR, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | goto err_out_misc_deregister; |
| 743 | } |
| 744 | |
| 745 | /* we can register the device now, as it is ready */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 746 | usb_set_intfdata(interface, usb_pcwd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 748 | pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | heartbeat, nowayout); |
| 750 | |
| 751 | return 0; |
| 752 | |
| 753 | err_out_misc_deregister: |
| 754 | misc_deregister(&usb_pcwd_temperature_miscdev); |
| 755 | err_out_unregister_reboot: |
| 756 | unregister_reboot_notifier(&usb_pcwd_notifier); |
| 757 | error: |
Adrian Bunk | c9d1a0b | 2006-03-10 19:04:38 +0100 | [diff] [blame] | 758 | if (usb_pcwd) |
| 759 | usb_pcwd_delete(usb_pcwd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | usb_pcwd_device = NULL; |
| 761 | return retval; |
| 762 | } |
| 763 | |
| 764 | |
| 765 | /** |
| 766 | * usb_pcwd_disconnect |
| 767 | * |
| 768 | * Called by the usb core when the device is removed from the system. |
| 769 | * |
| 770 | * This routine guarantees that the driver will not submit any more urbs |
| 771 | * by clearing dev->udev. |
| 772 | */ |
| 773 | static void usb_pcwd_disconnect(struct usb_interface *interface) |
| 774 | { |
| 775 | struct usb_pcwd_private *usb_pcwd; |
| 776 | |
| 777 | /* prevent races with open() */ |
Ingo Molnar | 6f87f0d | 2006-03-23 03:00:27 -0800 | [diff] [blame] | 778 | mutex_lock(&disconnect_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 780 | usb_pcwd = usb_get_intfdata(interface); |
| 781 | usb_set_intfdata(interface, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | |
Matthias Kaehlcke | 9f7afa6 | 2007-05-03 20:15:14 -0700 | [diff] [blame] | 783 | mutex_lock(&usb_pcwd->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
| 785 | /* Stop the timer before we leave */ |
| 786 | if (!nowayout) |
| 787 | usb_pcwd_stop(usb_pcwd); |
| 788 | |
| 789 | /* We should now stop communicating with the USB PCWD device */ |
| 790 | usb_pcwd->exists = 0; |
| 791 | |
| 792 | /* Deregister */ |
| 793 | misc_deregister(&usb_pcwd_miscdev); |
| 794 | misc_deregister(&usb_pcwd_temperature_miscdev); |
| 795 | unregister_reboot_notifier(&usb_pcwd_notifier); |
| 796 | |
Matthias Kaehlcke | 9f7afa6 | 2007-05-03 20:15:14 -0700 | [diff] [blame] | 797 | mutex_unlock(&usb_pcwd->mtx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
| 799 | /* Delete the USB PCWD device */ |
| 800 | usb_pcwd_delete(usb_pcwd); |
| 801 | |
| 802 | cards_found--; |
| 803 | |
Ingo Molnar | 6f87f0d | 2006-03-23 03:00:27 -0800 | [diff] [blame] | 804 | mutex_unlock(&disconnect_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 806 | pr_info("USB PC Watchdog disconnected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | } |
| 808 | |
Greg Kroah-Hartman | fe74848 | 2011-11-18 09:52:10 -0800 | [diff] [blame] | 809 | module_usb_driver(usb_pcwd_driver); |