![Kirill Smelkov](/assets/img/avatar_default.png)
Using scripts/coccinelle/api/stream_open.cocci added in10dce8af34
("fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock"), search and convert to stream_open all in-kernel nonseekable_open users for which read and write actually do not depend on ppos and where there is no other methods in file_operations which assume @offset access. I've verified each generated change manually - that it is correct to convert - and each other nonseekable_open instance left - that it is either not correct to convert there, or that it is not converted due to current stream_open.cocci limitations. The script also does not convert files that should be valid to convert, but that currently have .llseek = noop_llseek or generic_file_llseek for unknown reason despite file being opened with nonseekable_open (e.g. drivers/input/mousedev.c) Among cases converted 14 were potentially vulnerable to read vs write deadlock (see details in10dce8af34
): drivers/char/pcmcia/cm4000_cs.c:1685:7-23: ERROR: cm4000_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/gnss/core.c:45:1-17: ERROR: gnss_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/hid/uhid.c:635:1-17: ERROR: uhid_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/infiniband/core/user_mad.c:988:1-17: ERROR: umad_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/input/evdev.c:527:1-17: ERROR: evdev_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/input/misc/uinput.c:401:1-17: ERROR: uinput_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/isdn/capi/capi.c:963:8-24: ERROR: capi_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/leds/uleds.c:77:1-17: ERROR: uleds_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/media/rc/lirc_dev.c:198:1-17: ERROR: lirc_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/s390/char/fs3270.c:488:1-17: ERROR: fs3270_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/usb/misc/ldusb.c:310:1-17: ERROR: ld_usb_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. drivers/xen/evtchn.c:667:8-24: ERROR: evtchn_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. net/batman-adv/icmp_socket.c:80:1-17: ERROR: batadv_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. net/rfkill/core.c:1146:8-24: ERROR: rfkill_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix. and the rest were just safe to convert to stream_open because their read and write do not use ppos at all and corresponding file_operations do not have methods that assume @offset file access(*): arch/powerpc/platforms/52xx/mpc52xx_gpt.c:631:8-24: WARNING: mpc52xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_ibox_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_ibox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_mbox_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_mbox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_wbox_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/powerpc/platforms/cell/spufs/file.c:591:8-24: WARNING: spufs_wbox_stat_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. arch/um/drivers/harddog_kern.c:88:8-24: WARNING: harddog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. arch/x86/kernel/cpu/microcode/core.c:430:33-49: WARNING: microcode_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/ds1620.c:215:8-24: WARNING: ds1620_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/dtlk.c:301:1-17: WARNING: dtlk_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/ipmi/ipmi_watchdog.c:840:9-25: WARNING: ipmi_wdog_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/pcmcia/scr24x_cs.c:95:8-24: WARNING: scr24x_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/char/tb0219.c:246:9-25: WARNING: tb0219_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/firewire/nosy.c:306:8-24: WARNING: nosy_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/hwmon/fschmd.c:840:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/hwmon/w83793.c:1344:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/ucma.c:1747:8-24: WARNING: ucma_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/ucm.c:1178:8-24: WARNING: ucm_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/infiniband/core/uverbs_main.c:1086:8-24: WARNING: uverbs_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/input/joydev.c:282:1-17: WARNING: joydev_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/pci/switch/switchtec.c:393:1-17: WARNING: switchtec_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/platform/chrome/cros_ec_debugfs.c:135:8-24: WARNING: cros_ec_console_log_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/rtc/rtc-ds1374.c:470:9-25: WARNING: ds1374_wdt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/rtc/rtc-m41t80.c:805:9-25: WARNING: wdt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/char/tape_char.c:293:2-18: WARNING: tape_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/char/zcore.c:194:8-24: WARNING: zcore_reipl_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/s390/crypto/zcrypt_api.c:528:8-24: WARNING: zcrypt_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/spi/spidev.c:594:1-17: WARNING: spidev_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/staging/pi433/pi433_if.c:974:1-17: WARNING: pi433_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/acquirewdt.c:203:8-24: WARNING: acq_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/advantechwdt.c:202:8-24: WARNING: advwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/alim1535_wdt.c:252:8-24: WARNING: ali_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/alim7101_wdt.c:217:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ar7_wdt.c:166:8-24: WARNING: ar7_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/at91rm9200_wdt.c:113:8-24: WARNING: at91wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ath79_wdt.c:135:8-24: WARNING: ath79_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/bcm63xx_wdt.c:119:8-24: WARNING: bcm63xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/cpu5wdt.c:143:8-24: WARNING: cpu5wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/cpwd.c:397:8-24: WARNING: cpwd_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/eurotechwdt.c:319:8-24: WARNING: eurwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/f71808e_wdt.c:528:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/gef_wdt.c:232:8-24: WARNING: gef_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/geodewdt.c:95:8-24: WARNING: geodewdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ib700wdt.c:241:8-24: WARNING: ibwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ibmasr.c:326:8-24: WARNING: asr_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/indydog.c:80:8-24: WARNING: indydog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/intel_scu_watchdog.c:307:8-24: WARNING: intel_scu_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/iop_wdt.c:104:8-24: WARNING: iop_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/it8712f_wdt.c:330:8-24: WARNING: it8712f_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ixp4xx_wdt.c:68:8-24: WARNING: ixp4xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/ks8695_wdt.c:145:8-24: WARNING: ks8695wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/m54xx_wdt.c:88:8-24: WARNING: m54xx_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/machzwd.c:336:8-24: WARNING: zf_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mixcomwd.c:153:8-24: WARNING: mixcomwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mtx-1_wdt.c:121:8-24: WARNING: mtx1_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/mv64x60_wdt.c:136:8-24: WARNING: mv64x60_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/nuc900_wdt.c:134:8-24: WARNING: nuc900wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/nv_tco.c:164:8-24: WARNING: nv_tco_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pc87413_wdt.c:289:8-24: WARNING: pc87413_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd.c:698:8-24: WARNING: pcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd.c:737:8-24: WARNING: pcwd_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_pci.c:581:8-24: WARNING: pcipcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_pci.c:623:8-24: WARNING: pcipcwd_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_usb.c:488:8-24: WARNING: usb_pcwd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pcwd_usb.c:527:8-24: WARNING: usb_pcwd_temperature_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pika_wdt.c:121:8-24: WARNING: pikawdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/pnx833x_wdt.c:119:8-24: WARNING: pnx833x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/rc32434_wdt.c:153:8-24: WARNING: rc32434_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/rdc321x_wdt.c:145:8-24: WARNING: rdc321x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/riowd.c:79:1-17: WARNING: riowd_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sa1100_wdt.c:62:8-24: WARNING: sa1100dog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc60xxwdt.c:211:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc7240_wdt.c:139:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc8360.c:274:8-24: WARNING: sbc8360_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc_epx_c3.c:81:8-24: WARNING: epx_c3_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sbc_fitpc2_wdt.c:78:8-24: WARNING: fitpc2_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sb_wdog.c:108:1-17: WARNING: sbwdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sc1200wdt.c:181:8-24: WARNING: sc1200wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sc520_wdt.c:261:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/sch311x_wdt.c:319:8-24: WARNING: sch311x_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/scx200_wdt.c:105:8-24: WARNING: scx200_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/smsc37b787_wdt.c:369:8-24: WARNING: wb_smsc_wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/w83877f_wdt.c:227:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/w83977f_wdt.c:301:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wafer5823wdt.c:200:8-24: WARNING: wafwdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/watchdog_dev.c:828:8-24: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdrtas.c:379:8-24: WARNING: wdrtas_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdrtas.c:445:8-24: WARNING: wdrtas_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt285.c:104:1-17: WARNING: watchdog_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt977.c:276:8-24: WARNING: wdt977_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt.c:424:8-24: WARNING: wdt_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt.c:484:8-24: WARNING: wdt_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt_pci.c:464:8-24: WARNING: wdtpci_fops: .write() has stream semantic; safe to change nonseekable_open -> stream_open. drivers/watchdog/wdt_pci.c:527:8-24: WARNING: wdtpci_temp_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. net/batman-adv/log.c:105:1-17: WARNING: batadv_log_fops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. sound/core/control.c:57:7-23: WARNING: snd_ctl_f_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. sound/core/rawmidi.c:385:7-23: WARNING: snd_rawmidi_f_ops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. sound/core/seq/seq_clientmgr.c:310:7-23: WARNING: snd_seq_f_ops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open. sound/core/timer.c:1428:7-23: WARNING: snd_timer_f_ops: .read() has stream semantic; safe to change nonseekable_open -> stream_open. One can also recheck/review the patch via generating it with explanation comments included via $ make coccicheck MODE=patch COCCI=scripts/coccinelle/api/stream_open.cocci SPFLAGS="-D explain" (*) This second group also contains cases with read/write deadlocks that stream_open.cocci don't yet detect, but which are still valid to convert to stream_open since ppos is not used. For example drivers/pci/switch/switchtec.c calls wait_for_completion_interruptible() in its .read, but stream_open.cocci currently detects only "wait_event*" as blocking. Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Yongzhi Pan <panyongzhi@gmail.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Juergen Gross <jgross@suse.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: Tejun Heo <tj@kernel.org> Cc: Kirill Tkhai <ktkhai@virtuozzo.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Julia Lawall <Julia.Lawall@lip6.fr> Cc: Nikolaus Rath <Nikolaus@rath.org> Cc: Han-Wen Nienhuys <hanwen@google.com> Cc: Anatolij Gustschin <agust@denx.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James R. Van Zandt" <jrv@vanzandt.mv.com> Cc: Corey Minyard <minyard@acm.org> Cc: Harald Welte <laforge@gnumonks.org> Acked-by: Lubomir Rintel <lkundrak@v3.sk> [scr24x_cs] Cc: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Johan Hovold <johan@kernel.org> Cc: David Herrmann <dh.herrmann@googlemail.com> Cc: Jiri Kosina <jikos@kernel.org> Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com> Cc: Jean Delvare <jdelvare@suse.com> Acked-by: Guenter Roeck <linux@roeck-us.net> [watchdog/* hwmon/*] Cc: Rudolf Marek <r.marek@assembler.cz> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Karsten Keil <isdn@linux-pingi.de> Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com> Acked-by: Logan Gunthorpe <logang@deltatee.com> [drivers/pci/switch/switchtec] Acked-by: Bjorn Helgaas <bhelgaas@google.com> [drivers/pci/switch/switchtec] Cc: Benson Leung <bleung@chromium.org> Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> [platform/chrome] Cc: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> [rtc/*] Cc: Mark Brown <broonie@kernel.org> Cc: Wim Van Sebroeck <wim@linux-watchdog.org> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Zwane Mwaikambo <zwanem@gmail.com> Cc: Marek Lindner <mareklindner@neomailbox.ch> Cc: Simon Wunderlich <sw@simonwunderlich.de> Cc: Antonio Quartulli <a@unstable.cc> Cc: "David S. Miller" <davem@davemloft.net> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Signed-off-by: Kirill Smelkov <kirr@nexedi.com>
810 lines
21 KiB
C
810 lines
21 KiB
C
/*
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* Berkshire USB-PC Watchdog Card Driver
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*
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* (c) Copyright 2004-2007 Wim Van Sebroeck <wim@iguana.be>.
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*
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* Based on source code of the following authors:
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* Ken Hollis <kenji@bitgate.com>,
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* Alan Cox <alan@lxorguk.ukuu.org.uk>,
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* Matt Domsch <Matt_Domsch@dell.com>,
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* Rob Radez <rob@osinvestor.com>,
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* Greg Kroah-Hartman <greg@kroah.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
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* provide warranty for any of this software. This material is
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* provided "AS-IS" and at no charge.
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*
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* Thanks also to Simon Machell at Berkshire Products Inc. for
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* providing the test hardware. More info is available at
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* http://www.berkprod.com/ or http://www.pcwatchdog.com/
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h> /* For module specific items */
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#include <linux/moduleparam.h> /* For new moduleparam's */
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#include <linux/types.h> /* For standard types (like size_t) */
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#include <linux/errno.h> /* For the -ENODEV/... values */
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#include <linux/kernel.h> /* For printk/panic/... */
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#include <linux/delay.h> /* For mdelay function */
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#include <linux/miscdevice.h> /* For struct miscdevice */
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#include <linux/watchdog.h> /* For the watchdog specific items */
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#include <linux/notifier.h> /* For notifier support */
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#include <linux/reboot.h> /* For reboot_notifier stuff */
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#include <linux/init.h> /* For __init/__exit/... */
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#include <linux/fs.h> /* For file operations */
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#include <linux/usb.h> /* For USB functions */
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#include <linux/slab.h> /* For kmalloc, ... */
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#include <linux/mutex.h> /* For mutex locking */
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#include <linux/hid.h> /* For HID_REQ_SET_REPORT & HID_DT_REPORT */
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
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/* Module and Version Information */
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#define DRIVER_VERSION "1.02"
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#define DRIVER_AUTHOR "Wim Van Sebroeck <wim@iguana.be>"
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#define DRIVER_DESC "Berkshire USB-PC Watchdog driver"
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#define DRIVER_NAME "pcwd_usb"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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#define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
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delay-time from dip-switches */
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static int heartbeat = WATCHDOG_HEARTBEAT;
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
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"(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/* The vendor and product id's for the USB-PC Watchdog card */
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#define USB_PCWD_VENDOR_ID 0x0c98
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#define USB_PCWD_PRODUCT_ID 0x1140
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/* table of devices that work with this driver */
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static const struct usb_device_id usb_pcwd_table[] = {
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{ USB_DEVICE(USB_PCWD_VENDOR_ID, USB_PCWD_PRODUCT_ID) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, usb_pcwd_table);
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/* according to documentation max. time to process a command for the USB
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* watchdog card is 100 or 200 ms, so we give it 250 ms to do it's job */
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#define USB_COMMAND_TIMEOUT 250
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/* Watchdog's internal commands */
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#define CMD_READ_TEMP 0x02 /* Read Temperature;
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Re-trigger Watchdog */
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#define CMD_TRIGGER CMD_READ_TEMP
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#define CMD_GET_STATUS 0x04 /* Get Status Information */
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#define CMD_GET_FIRMWARE_VERSION 0x08 /* Get Firmware Version */
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#define CMD_GET_DIP_SWITCH_SETTINGS 0x0c /* Get Dip Switch Settings */
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#define CMD_READ_WATCHDOG_TIMEOUT 0x18 /* Read Current Watchdog Time */
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#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 /* Write Current WatchdogTime */
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#define CMD_ENABLE_WATCHDOG 0x30 /* Enable / Disable Watchdog */
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#define CMD_DISABLE_WATCHDOG CMD_ENABLE_WATCHDOG
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/* Watchdog's Dip Switch heartbeat values */
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static const int heartbeat_tbl[] = {
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5, /* OFF-OFF-OFF = 5 Sec */
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10, /* OFF-OFF-ON = 10 Sec */
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30, /* OFF-ON-OFF = 30 Sec */
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60, /* OFF-ON-ON = 1 Min */
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300, /* ON-OFF-OFF = 5 Min */
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600, /* ON-OFF-ON = 10 Min */
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1800, /* ON-ON-OFF = 30 Min */
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3600, /* ON-ON-ON = 1 hour */
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};
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/* We can only use 1 card due to the /dev/watchdog restriction */
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static int cards_found;
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/* some internal variables */
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static unsigned long is_active;
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static char expect_release;
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/* Structure to hold all of our device specific stuff */
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struct usb_pcwd_private {
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/* save off the usb device pointer */
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struct usb_device *udev;
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/* the interface for this device */
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struct usb_interface *interface;
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/* the interface number used for cmd's */
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unsigned int interface_number;
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/* the buffer to intr data */
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unsigned char *intr_buffer;
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/* the dma address for the intr buffer */
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dma_addr_t intr_dma;
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/* the size of the intr buffer */
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size_t intr_size;
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/* the urb used for the intr pipe */
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struct urb *intr_urb;
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/* The command that is reported back */
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unsigned char cmd_command;
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/* The data MSB that is reported back */
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unsigned char cmd_data_msb;
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/* The data LSB that is reported back */
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unsigned char cmd_data_lsb;
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/* true if we received a report after a command */
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atomic_t cmd_received;
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/* Wether or not the device exists */
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int exists;
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/* locks this structure */
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struct mutex mtx;
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};
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static struct usb_pcwd_private *usb_pcwd_device;
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/* prevent races between open() and disconnect() */
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static DEFINE_MUTEX(disconnect_mutex);
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/* local function prototypes */
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static int usb_pcwd_probe(struct usb_interface *interface,
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const struct usb_device_id *id);
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static void usb_pcwd_disconnect(struct usb_interface *interface);
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/* usb specific object needed to register this driver with the usb subsystem */
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static struct usb_driver usb_pcwd_driver = {
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.name = DRIVER_NAME,
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.probe = usb_pcwd_probe,
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.disconnect = usb_pcwd_disconnect,
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.id_table = usb_pcwd_table,
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};
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static void usb_pcwd_intr_done(struct urb *urb)
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{
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struct usb_pcwd_private *usb_pcwd =
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(struct usb_pcwd_private *)urb->context;
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unsigned char *data = usb_pcwd->intr_buffer;
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struct device *dev = &usb_pcwd->interface->dev;
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int retval;
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switch (urb->status) {
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case 0: /* success */
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break;
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case -ECONNRESET: /* unlink */
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dev_dbg(dev, "%s - urb shutting down with status: %d",
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__func__, urb->status);
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return;
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/* -EPIPE: should clear the halt */
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default: /* error */
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dev_dbg(dev, "%s - nonzero urb status received: %d",
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__func__, urb->status);
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goto resubmit;
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}
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dev_dbg(dev, "received following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
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data[0], data[1], data[2]);
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usb_pcwd->cmd_command = data[0];
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usb_pcwd->cmd_data_msb = data[1];
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usb_pcwd->cmd_data_lsb = data[2];
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/* notify anyone waiting that the cmd has finished */
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atomic_set(&usb_pcwd->cmd_received, 1);
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resubmit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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pr_err("can't resubmit intr, usb_submit_urb failed with result %d\n",
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retval);
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}
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static int usb_pcwd_send_command(struct usb_pcwd_private *usb_pcwd,
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unsigned char cmd, unsigned char *msb, unsigned char *lsb)
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{
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int got_response, count;
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unsigned char *buf;
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/* We will not send any commands if the USB PCWD device does
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* not exist */
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if ((!usb_pcwd) || (!usb_pcwd->exists))
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return -1;
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buf = kmalloc(6, GFP_KERNEL);
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if (buf == NULL)
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return 0;
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/* The USB PC Watchdog uses a 6 byte report format.
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* The board currently uses only 3 of the six bytes of the report. */
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buf[0] = cmd; /* Byte 0 = CMD */
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buf[1] = *msb; /* Byte 1 = Data MSB */
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buf[2] = *lsb; /* Byte 2 = Data LSB */
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buf[3] = buf[4] = buf[5] = 0; /* All other bytes not used */
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dev_dbg(&usb_pcwd->interface->dev,
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"sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x",
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buf[0], buf[1], buf[2]);
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atomic_set(&usb_pcwd->cmd_received, 0);
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if (usb_control_msg(usb_pcwd->udev, usb_sndctrlpipe(usb_pcwd->udev, 0),
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HID_REQ_SET_REPORT, HID_DT_REPORT,
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0x0200, usb_pcwd->interface_number, buf, 6,
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USB_COMMAND_TIMEOUT) != 6) {
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dev_dbg(&usb_pcwd->interface->dev,
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"usb_pcwd_send_command: error in usb_control_msg for cmd 0x%x 0x%x 0x%x\n",
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cmd, *msb, *lsb);
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}
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/* wait till the usb card processed the command,
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* with a max. timeout of USB_COMMAND_TIMEOUT */
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got_response = 0;
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for (count = 0; (count < USB_COMMAND_TIMEOUT) && (!got_response);
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count++) {
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mdelay(1);
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if (atomic_read(&usb_pcwd->cmd_received))
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got_response = 1;
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}
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if ((got_response) && (cmd == usb_pcwd->cmd_command)) {
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/* read back response */
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*msb = usb_pcwd->cmd_data_msb;
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*lsb = usb_pcwd->cmd_data_lsb;
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}
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kfree(buf);
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return got_response;
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}
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static int usb_pcwd_start(struct usb_pcwd_private *usb_pcwd)
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{
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unsigned char msb = 0x00;
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unsigned char lsb = 0x00;
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int retval;
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/* Enable Watchdog */
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retval = usb_pcwd_send_command(usb_pcwd, CMD_ENABLE_WATCHDOG,
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&msb, &lsb);
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if ((retval == 0) || (lsb == 0)) {
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pr_err("Card did not acknowledge enable attempt\n");
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return -1;
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}
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return 0;
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}
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static int usb_pcwd_stop(struct usb_pcwd_private *usb_pcwd)
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{
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unsigned char msb = 0xA5;
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unsigned char lsb = 0xC3;
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int retval;
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/* Disable Watchdog */
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retval = usb_pcwd_send_command(usb_pcwd, CMD_DISABLE_WATCHDOG,
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&msb, &lsb);
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if ((retval == 0) || (lsb != 0)) {
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pr_err("Card did not acknowledge disable attempt\n");
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return -1;
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}
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return 0;
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}
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static int usb_pcwd_keepalive(struct usb_pcwd_private *usb_pcwd)
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{
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unsigned char dummy;
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/* Re-trigger Watchdog */
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usb_pcwd_send_command(usb_pcwd, CMD_TRIGGER, &dummy, &dummy);
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return 0;
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}
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static int usb_pcwd_set_heartbeat(struct usb_pcwd_private *usb_pcwd, int t)
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{
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unsigned char msb = t / 256;
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unsigned char lsb = t % 256;
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if ((t < 0x0001) || (t > 0xFFFF))
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return -EINVAL;
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/* Write new heartbeat to watchdog */
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usb_pcwd_send_command(usb_pcwd, CMD_WRITE_WATCHDOG_TIMEOUT, &msb, &lsb);
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heartbeat = t;
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return 0;
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}
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static int usb_pcwd_get_temperature(struct usb_pcwd_private *usb_pcwd,
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int *temperature)
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{
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unsigned char msb, lsb;
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usb_pcwd_send_command(usb_pcwd, CMD_READ_TEMP, &msb, &lsb);
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/*
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* Convert celsius to fahrenheit, since this was
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* the decided 'standard' for this return value.
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*/
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*temperature = (lsb * 9 / 5) + 32;
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return 0;
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}
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static int usb_pcwd_get_timeleft(struct usb_pcwd_private *usb_pcwd,
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int *time_left)
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{
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unsigned char msb, lsb;
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/* Read the time that's left before rebooting */
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/* Note: if the board is not yet armed then we will read 0xFFFF */
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usb_pcwd_send_command(usb_pcwd, CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
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*time_left = (msb << 8) + lsb;
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return 0;
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}
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/*
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* /dev/watchdog handling
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*/
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static ssize_t usb_pcwd_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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/* See if we got the magic character 'V' and reload the timer */
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if (len) {
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if (!nowayout) {
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size_t i;
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/* note: just in case someone wrote the magic character
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* five months ago... */
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expect_release = 0;
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/* scan to see whether or not we got the
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* magic character */
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_release = 42;
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}
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}
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/* someone wrote to us, we should reload the timer */
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usb_pcwd_keepalive(usb_pcwd_device);
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}
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return len;
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}
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static long usb_pcwd_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static const struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_SETTIMEOUT |
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WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = DRIVER_NAME,
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_GETTEMP:
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{
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int temperature;
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if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
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return -EFAULT;
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return put_user(temperature, p);
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}
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case WDIOC_SETOPTIONS:
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{
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int new_options, retval = -EINVAL;
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if (get_user(new_options, p))
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return -EFAULT;
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if (new_options & WDIOS_DISABLECARD) {
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usb_pcwd_stop(usb_pcwd_device);
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retval = 0;
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}
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if (new_options & WDIOS_ENABLECARD) {
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usb_pcwd_start(usb_pcwd_device);
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retval = 0;
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}
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return retval;
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}
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case WDIOC_KEEPALIVE:
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usb_pcwd_keepalive(usb_pcwd_device);
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return 0;
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case WDIOC_SETTIMEOUT:
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{
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int new_heartbeat;
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if (get_user(new_heartbeat, p))
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return -EFAULT;
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if (usb_pcwd_set_heartbeat(usb_pcwd_device, new_heartbeat))
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return -EINVAL;
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usb_pcwd_keepalive(usb_pcwd_device);
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}
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/* fall through */
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case WDIOC_GETTIMEOUT:
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return put_user(heartbeat, p);
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case WDIOC_GETTIMELEFT:
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{
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int time_left;
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if (usb_pcwd_get_timeleft(usb_pcwd_device, &time_left))
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return -EFAULT;
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return put_user(time_left, p);
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}
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default:
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return -ENOTTY;
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}
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}
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static int usb_pcwd_open(struct inode *inode, struct file *file)
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{
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/* /dev/watchdog can only be opened once */
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if (test_and_set_bit(0, &is_active))
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return -EBUSY;
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|
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/* Activate */
|
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usb_pcwd_start(usb_pcwd_device);
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usb_pcwd_keepalive(usb_pcwd_device);
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return stream_open(inode, file);
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}
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static int usb_pcwd_release(struct inode *inode, struct file *file)
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{
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/*
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* Shut off the timer.
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*/
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if (expect_release == 42) {
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usb_pcwd_stop(usb_pcwd_device);
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} else {
|
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pr_crit("Unexpected close, not stopping watchdog!\n");
|
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usb_pcwd_keepalive(usb_pcwd_device);
|
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}
|
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expect_release = 0;
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clear_bit(0, &is_active);
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return 0;
|
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}
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|
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/*
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* /dev/temperature handling
|
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*/
|
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|
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static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
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size_t len, loff_t *ppos)
|
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{
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int temperature;
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|
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if (usb_pcwd_get_temperature(usb_pcwd_device, &temperature))
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return -EFAULT;
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if (copy_to_user(data, &temperature, 1))
|
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return -EFAULT;
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|
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return 1;
|
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}
|
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|
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static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
|
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{
|
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return stream_open(inode, file);
|
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}
|
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|
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static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
|
|
{
|
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return 0;
|
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}
|
|
|
|
/*
|
|
* Notify system
|
|
*/
|
|
|
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static int usb_pcwd_notify_sys(struct notifier_block *this, unsigned long code,
|
|
void *unused)
|
|
{
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
usb_pcwd_stop(usb_pcwd_device); /* Turn the WDT off */
|
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|
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return NOTIFY_DONE;
|
|
}
|
|
|
|
/*
|
|
* Kernel Interfaces
|
|
*/
|
|
|
|
static const struct file_operations usb_pcwd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = usb_pcwd_write,
|
|
.unlocked_ioctl = usb_pcwd_ioctl,
|
|
.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_free_coherent(usb_pcwd->udev, usb_pcwd->intr_size,
|
|
usb_pcwd->intr_buffer, usb_pcwd->intr_dma);
|
|
kfree(usb_pcwd);
|
|
}
|
|
|
|
/**
|
|
* usb_pcwd_probe
|
|
*
|
|
* Called by the usb core when a new device is connected that it thinks
|
|
* this driver might be interested in.
|
|
*/
|
|
static int usb_pcwd_probe(struct usb_interface *interface,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_device *udev = interface_to_usbdev(interface);
|
|
struct usb_host_interface *iface_desc;
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
struct usb_pcwd_private *usb_pcwd = NULL;
|
|
int pipe;
|
|
int retval = -ENOMEM;
|
|
int got_fw_rev;
|
|
unsigned char fw_rev_major, fw_rev_minor;
|
|
char fw_ver_str[20];
|
|
unsigned char option_switches, dummy;
|
|
|
|
cards_found++;
|
|
if (cards_found > 1) {
|
|
pr_err("This driver only supports 1 device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* get the active interface descriptor */
|
|
iface_desc = interface->cur_altsetting;
|
|
|
|
/* check out that we have a HID device */
|
|
if (!(iface_desc->desc.bInterfaceClass == USB_CLASS_HID)) {
|
|
pr_err("The device isn't a Human Interface Device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (iface_desc->desc.bNumEndpoints < 1)
|
|
return -ENODEV;
|
|
|
|
/* check out the endpoint: it has to be Interrupt & IN */
|
|
endpoint = &iface_desc->endpoint[0].desc;
|
|
|
|
if (!usb_endpoint_is_int_in(endpoint)) {
|
|
/* we didn't find a Interrupt endpoint with direction IN */
|
|
pr_err("Couldn't find an INTR & IN endpoint\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* get a handle to the interrupt data pipe */
|
|
pipe = usb_rcvintpipe(udev, endpoint->bEndpointAddress);
|
|
|
|
/* allocate memory for our device and initialize it */
|
|
usb_pcwd = kzalloc(sizeof(struct usb_pcwd_private), GFP_KERNEL);
|
|
if (usb_pcwd == NULL)
|
|
goto error;
|
|
|
|
usb_pcwd_device = usb_pcwd;
|
|
|
|
mutex_init(&usb_pcwd->mtx);
|
|
usb_pcwd->udev = udev;
|
|
usb_pcwd->interface = interface;
|
|
usb_pcwd->interface_number = iface_desc->desc.bInterfaceNumber;
|
|
usb_pcwd->intr_size = (le16_to_cpu(endpoint->wMaxPacketSize) > 8 ?
|
|
le16_to_cpu(endpoint->wMaxPacketSize) : 8);
|
|
|
|
/* set up the memory buffer's */
|
|
usb_pcwd->intr_buffer = usb_alloc_coherent(udev, usb_pcwd->intr_size,
|
|
GFP_ATOMIC, &usb_pcwd->intr_dma);
|
|
if (!usb_pcwd->intr_buffer) {
|
|
pr_err("Out of memory\n");
|
|
goto error;
|
|
}
|
|
|
|
/* allocate the urb's */
|
|
usb_pcwd->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!usb_pcwd->intr_urb)
|
|
goto error;
|
|
|
|
/* initialise the intr urb's */
|
|
usb_fill_int_urb(usb_pcwd->intr_urb, udev, pipe,
|
|
usb_pcwd->intr_buffer, usb_pcwd->intr_size,
|
|
usb_pcwd_intr_done, usb_pcwd, endpoint->bInterval);
|
|
usb_pcwd->intr_urb->transfer_dma = usb_pcwd->intr_dma;
|
|
usb_pcwd->intr_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
|
|
/* register our interrupt URB with the USB system */
|
|
if (usb_submit_urb(usb_pcwd->intr_urb, GFP_KERNEL)) {
|
|
pr_err("Problem registering interrupt URB\n");
|
|
retval = -EIO; /* failure */
|
|
goto error;
|
|
}
|
|
|
|
/* The device exists and can be communicated with */
|
|
usb_pcwd->exists = 1;
|
|
|
|
/* disable card */
|
|
usb_pcwd_stop(usb_pcwd);
|
|
|
|
/* Get the Firmware Version */
|
|
got_fw_rev = usb_pcwd_send_command(usb_pcwd, CMD_GET_FIRMWARE_VERSION,
|
|
&fw_rev_major, &fw_rev_minor);
|
|
if (got_fw_rev)
|
|
sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
|
|
else
|
|
sprintf(fw_ver_str, "<card no answer>");
|
|
|
|
pr_info("Found card (Firmware: %s) with temp option\n", fw_ver_str);
|
|
|
|
/* Get switch settings */
|
|
usb_pcwd_send_command(usb_pcwd, CMD_GET_DIP_SWITCH_SETTINGS, &dummy,
|
|
&option_switches);
|
|
|
|
pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
|
|
option_switches,
|
|
((option_switches & 0x10) ? "ON" : "OFF"),
|
|
((option_switches & 0x08) ? "ON" : "OFF"));
|
|
|
|
/* If heartbeat = 0 then we use the heartbeat from the dip-switches */
|
|
if (heartbeat == 0)
|
|
heartbeat = heartbeat_tbl[(option_switches & 0x07)];
|
|
|
|
/* Check that the heartbeat value is within it's range ;
|
|
* if not reset to the default */
|
|
if (usb_pcwd_set_heartbeat(usb_pcwd, heartbeat)) {
|
|
usb_pcwd_set_heartbeat(usb_pcwd, WATCHDOG_HEARTBEAT);
|
|
pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
|
|
WATCHDOG_HEARTBEAT);
|
|
}
|
|
|
|
retval = register_reboot_notifier(&usb_pcwd_notifier);
|
|
if (retval != 0) {
|
|
pr_err("cannot register reboot notifier (err=%d)\n", retval);
|
|
goto error;
|
|
}
|
|
|
|
retval = misc_register(&usb_pcwd_temperature_miscdev);
|
|
if (retval != 0) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
TEMP_MINOR, retval);
|
|
goto err_out_unregister_reboot;
|
|
}
|
|
|
|
retval = misc_register(&usb_pcwd_miscdev);
|
|
if (retval != 0) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, retval);
|
|
goto err_out_misc_deregister;
|
|
}
|
|
|
|
/* we can register the device now, as it is ready */
|
|
usb_set_intfdata(interface, usb_pcwd);
|
|
|
|
pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
|
|
heartbeat, nowayout);
|
|
|
|
return 0;
|
|
|
|
err_out_misc_deregister:
|
|
misc_deregister(&usb_pcwd_temperature_miscdev);
|
|
err_out_unregister_reboot:
|
|
unregister_reboot_notifier(&usb_pcwd_notifier);
|
|
error:
|
|
if (usb_pcwd)
|
|
usb_pcwd_delete(usb_pcwd);
|
|
usb_pcwd_device = NULL;
|
|
return retval;
|
|
}
|
|
|
|
|
|
/**
|
|
* usb_pcwd_disconnect
|
|
*
|
|
* Called by the usb core when the device is removed from the system.
|
|
*
|
|
* This routine guarantees that the driver will not submit any more urbs
|
|
* by clearing dev->udev.
|
|
*/
|
|
static void usb_pcwd_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct usb_pcwd_private *usb_pcwd;
|
|
|
|
/* prevent races with open() */
|
|
mutex_lock(&disconnect_mutex);
|
|
|
|
usb_pcwd = usb_get_intfdata(interface);
|
|
usb_set_intfdata(interface, NULL);
|
|
|
|
mutex_lock(&usb_pcwd->mtx);
|
|
|
|
/* Stop the timer before we leave */
|
|
if (!nowayout)
|
|
usb_pcwd_stop(usb_pcwd);
|
|
|
|
/* We should now stop communicating with the USB PCWD device */
|
|
usb_pcwd->exists = 0;
|
|
|
|
/* Deregister */
|
|
misc_deregister(&usb_pcwd_miscdev);
|
|
misc_deregister(&usb_pcwd_temperature_miscdev);
|
|
unregister_reboot_notifier(&usb_pcwd_notifier);
|
|
|
|
mutex_unlock(&usb_pcwd->mtx);
|
|
|
|
/* Delete the USB PCWD device */
|
|
usb_pcwd_delete(usb_pcwd);
|
|
|
|
cards_found--;
|
|
|
|
mutex_unlock(&disconnect_mutex);
|
|
|
|
pr_info("USB PC Watchdog disconnected\n");
|
|
}
|
|
|
|
module_usb_driver(usb_pcwd_driver);
|