![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>
424 lines
8.4 KiB
C
424 lines
8.4 KiB
C
/*
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* linux/drivers/char/ds1620.c: Dallas Semiconductors DS1620
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* thermometer driver (as used in the Rebel.com NetWinder)
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*/
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <linux/delay.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/capability.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <linux/uaccess.h>
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#include <asm/therm.h>
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#ifdef CONFIG_PROC_FS
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/* define for /proc interface */
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#define THERM_USE_PROC
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#endif
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/* Definitions for DS1620 chip */
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#define THERM_START_CONVERT 0xee
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#define THERM_RESET 0xaf
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#define THERM_READ_CONFIG 0xac
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#define THERM_READ_TEMP 0xaa
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#define THERM_READ_TL 0xa2
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#define THERM_READ_TH 0xa1
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#define THERM_WRITE_CONFIG 0x0c
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#define THERM_WRITE_TL 0x02
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#define THERM_WRITE_TH 0x01
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#define CFG_CPU 2
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#define CFG_1SHOT 1
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static DEFINE_MUTEX(ds1620_mutex);
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static const char *fan_state[] = { "off", "on", "on (hardwired)" };
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/*
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* Start of NetWinder specifics
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* Note! We have to hold the gpio lock with IRQs disabled over the
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* whole of our transaction to the Dallas chip, since there is a
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* chance that the WaveArtist driver could touch these bits to
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* enable or disable the speaker.
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|
*/
|
|
extern unsigned int system_rev;
|
|
|
|
static inline void netwinder_ds1620_set_clk(int clk)
|
|
{
|
|
nw_gpio_modify_op(GPIO_DSCLK, clk ? GPIO_DSCLK : 0);
|
|
}
|
|
|
|
static inline void netwinder_ds1620_set_data(int dat)
|
|
{
|
|
nw_gpio_modify_op(GPIO_DATA, dat ? GPIO_DATA : 0);
|
|
}
|
|
|
|
static inline int netwinder_ds1620_get_data(void)
|
|
{
|
|
return nw_gpio_read() & GPIO_DATA;
|
|
}
|
|
|
|
static inline void netwinder_ds1620_set_data_dir(int dir)
|
|
{
|
|
nw_gpio_modify_io(GPIO_DATA, dir ? GPIO_DATA : 0);
|
|
}
|
|
|
|
static inline void netwinder_ds1620_reset(void)
|
|
{
|
|
nw_cpld_modify(CPLD_DS_ENABLE, 0);
|
|
nw_cpld_modify(CPLD_DS_ENABLE, CPLD_DS_ENABLE);
|
|
}
|
|
|
|
static inline void netwinder_lock(unsigned long *flags)
|
|
{
|
|
raw_spin_lock_irqsave(&nw_gpio_lock, *flags);
|
|
}
|
|
|
|
static inline void netwinder_unlock(unsigned long *flags)
|
|
{
|
|
raw_spin_unlock_irqrestore(&nw_gpio_lock, *flags);
|
|
}
|
|
|
|
static inline void netwinder_set_fan(int i)
|
|
{
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&nw_gpio_lock, flags);
|
|
nw_gpio_modify_op(GPIO_FAN, i ? GPIO_FAN : 0);
|
|
raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
|
|
}
|
|
|
|
static inline int netwinder_get_fan(void)
|
|
{
|
|
if ((system_rev & 0xf000) == 0x4000)
|
|
return FAN_ALWAYS_ON;
|
|
|
|
return (nw_gpio_read() & GPIO_FAN) ? FAN_ON : FAN_OFF;
|
|
}
|
|
|
|
/*
|
|
* End of NetWinder specifics
|
|
*/
|
|
|
|
static void ds1620_send_bits(int nr, int value)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
netwinder_ds1620_set_data(value & 1);
|
|
netwinder_ds1620_set_clk(0);
|
|
udelay(1);
|
|
netwinder_ds1620_set_clk(1);
|
|
udelay(1);
|
|
|
|
value >>= 1;
|
|
}
|
|
}
|
|
|
|
static unsigned int ds1620_recv_bits(int nr)
|
|
{
|
|
unsigned int value = 0, mask = 1;
|
|
int i;
|
|
|
|
netwinder_ds1620_set_data(0);
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
netwinder_ds1620_set_clk(0);
|
|
udelay(1);
|
|
|
|
if (netwinder_ds1620_get_data())
|
|
value |= mask;
|
|
|
|
mask <<= 1;
|
|
|
|
netwinder_ds1620_set_clk(1);
|
|
udelay(1);
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
static void ds1620_out(int cmd, int bits, int value)
|
|
{
|
|
unsigned long flags;
|
|
|
|
netwinder_lock(&flags);
|
|
netwinder_ds1620_set_clk(1);
|
|
netwinder_ds1620_set_data_dir(0);
|
|
netwinder_ds1620_reset();
|
|
|
|
udelay(1);
|
|
|
|
ds1620_send_bits(8, cmd);
|
|
if (bits)
|
|
ds1620_send_bits(bits, value);
|
|
|
|
udelay(1);
|
|
|
|
netwinder_ds1620_reset();
|
|
netwinder_unlock(&flags);
|
|
|
|
msleep(20);
|
|
}
|
|
|
|
static unsigned int ds1620_in(int cmd, int bits)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int value;
|
|
|
|
netwinder_lock(&flags);
|
|
netwinder_ds1620_set_clk(1);
|
|
netwinder_ds1620_set_data_dir(0);
|
|
netwinder_ds1620_reset();
|
|
|
|
udelay(1);
|
|
|
|
ds1620_send_bits(8, cmd);
|
|
|
|
netwinder_ds1620_set_data_dir(1);
|
|
value = ds1620_recv_bits(bits);
|
|
|
|
netwinder_ds1620_reset();
|
|
netwinder_unlock(&flags);
|
|
|
|
return value;
|
|
}
|
|
|
|
static int cvt_9_to_int(unsigned int val)
|
|
{
|
|
if (val & 0x100)
|
|
val |= 0xfffffe00;
|
|
|
|
return val;
|
|
}
|
|
|
|
static void ds1620_write_state(struct therm *therm)
|
|
{
|
|
ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
|
|
ds1620_out(THERM_WRITE_TL, 9, therm->lo);
|
|
ds1620_out(THERM_WRITE_TH, 9, therm->hi);
|
|
ds1620_out(THERM_START_CONVERT, 0, 0);
|
|
}
|
|
|
|
static void ds1620_read_state(struct therm *therm)
|
|
{
|
|
therm->lo = cvt_9_to_int(ds1620_in(THERM_READ_TL, 9));
|
|
therm->hi = cvt_9_to_int(ds1620_in(THERM_READ_TH, 9));
|
|
}
|
|
|
|
static int ds1620_open(struct inode *inode, struct file *file)
|
|
{
|
|
return stream_open(inode, file);
|
|
}
|
|
|
|
static ssize_t
|
|
ds1620_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
|
|
{
|
|
signed int cur_temp;
|
|
signed char cur_temp_degF;
|
|
|
|
cur_temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9)) >> 1;
|
|
|
|
/* convert to Fahrenheit, as per wdt.c */
|
|
cur_temp_degF = (cur_temp * 9) / 5 + 32;
|
|
|
|
if (copy_to_user(buf, &cur_temp_degF, 1))
|
|
return -EFAULT;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
ds1620_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct therm therm;
|
|
union {
|
|
struct therm __user *therm;
|
|
int __user *i;
|
|
} uarg;
|
|
int i;
|
|
|
|
uarg.i = (int __user *)arg;
|
|
|
|
switch(cmd) {
|
|
case CMD_SET_THERMOSTATE:
|
|
case CMD_SET_THERMOSTATE2:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (cmd == CMD_SET_THERMOSTATE) {
|
|
if (get_user(therm.hi, uarg.i))
|
|
return -EFAULT;
|
|
therm.lo = therm.hi - 3;
|
|
} else {
|
|
if (copy_from_user(&therm, uarg.therm, sizeof(therm)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
therm.lo <<= 1;
|
|
therm.hi <<= 1;
|
|
|
|
ds1620_write_state(&therm);
|
|
break;
|
|
|
|
case CMD_GET_THERMOSTATE:
|
|
case CMD_GET_THERMOSTATE2:
|
|
ds1620_read_state(&therm);
|
|
|
|
therm.lo >>= 1;
|
|
therm.hi >>= 1;
|
|
|
|
if (cmd == CMD_GET_THERMOSTATE) {
|
|
if (put_user(therm.hi, uarg.i))
|
|
return -EFAULT;
|
|
} else {
|
|
if (copy_to_user(uarg.therm, &therm, sizeof(therm)))
|
|
return -EFAULT;
|
|
}
|
|
break;
|
|
|
|
case CMD_GET_TEMPERATURE:
|
|
case CMD_GET_TEMPERATURE2:
|
|
i = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
|
|
|
|
if (cmd == CMD_GET_TEMPERATURE)
|
|
i >>= 1;
|
|
|
|
return put_user(i, uarg.i) ? -EFAULT : 0;
|
|
|
|
case CMD_GET_STATUS:
|
|
i = ds1620_in(THERM_READ_CONFIG, 8) & 0xe3;
|
|
|
|
return put_user(i, uarg.i) ? -EFAULT : 0;
|
|
|
|
case CMD_GET_FAN:
|
|
i = netwinder_get_fan();
|
|
|
|
return put_user(i, uarg.i) ? -EFAULT : 0;
|
|
|
|
case CMD_SET_FAN:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (get_user(i, uarg.i))
|
|
return -EFAULT;
|
|
|
|
netwinder_set_fan(i);
|
|
break;
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long
|
|
ds1620_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&ds1620_mutex);
|
|
ret = ds1620_ioctl(file, cmd, arg);
|
|
mutex_unlock(&ds1620_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef THERM_USE_PROC
|
|
static int ds1620_proc_therm_show(struct seq_file *m, void *v)
|
|
{
|
|
struct therm th;
|
|
int temp;
|
|
|
|
ds1620_read_state(&th);
|
|
temp = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
|
|
|
|
seq_printf(m, "Thermostat: HI %i.%i, LOW %i.%i; temperature: %i.%i C, fan %s\n",
|
|
th.hi >> 1, th.hi & 1 ? 5 : 0,
|
|
th.lo >> 1, th.lo & 1 ? 5 : 0,
|
|
temp >> 1, temp & 1 ? 5 : 0,
|
|
fan_state[netwinder_get_fan()]);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations ds1620_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ds1620_open,
|
|
.read = ds1620_read,
|
|
.unlocked_ioctl = ds1620_unlocked_ioctl,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct miscdevice ds1620_miscdev = {
|
|
TEMP_MINOR,
|
|
"temp",
|
|
&ds1620_fops
|
|
};
|
|
|
|
static int __init ds1620_init(void)
|
|
{
|
|
int ret;
|
|
struct therm th, th_start;
|
|
|
|
if (!machine_is_netwinder())
|
|
return -ENODEV;
|
|
|
|
ds1620_out(THERM_RESET, 0, 0);
|
|
ds1620_out(THERM_WRITE_CONFIG, 8, CFG_CPU);
|
|
ds1620_out(THERM_START_CONVERT, 0, 0);
|
|
|
|
/*
|
|
* Trigger the fan to start by setting
|
|
* temperature high point low. This kicks
|
|
* the fan into action.
|
|
*/
|
|
ds1620_read_state(&th);
|
|
th_start.lo = 0;
|
|
th_start.hi = 1;
|
|
ds1620_write_state(&th_start);
|
|
|
|
msleep(2000);
|
|
|
|
ds1620_write_state(&th);
|
|
|
|
ret = misc_register(&ds1620_miscdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
#ifdef THERM_USE_PROC
|
|
if (!proc_create_single("therm", 0, NULL, ds1620_proc_therm_show))
|
|
printk(KERN_ERR "therm: unable to register /proc/therm\n");
|
|
#endif
|
|
|
|
ds1620_read_state(&th);
|
|
ret = cvt_9_to_int(ds1620_in(THERM_READ_TEMP, 9));
|
|
|
|
printk(KERN_INFO "Thermostat: high %i.%i, low %i.%i, "
|
|
"current %i.%i C, fan %s.\n",
|
|
th.hi >> 1, th.hi & 1 ? 5 : 0,
|
|
th.lo >> 1, th.lo & 1 ? 5 : 0,
|
|
ret >> 1, ret & 1 ? 5 : 0,
|
|
fan_state[netwinder_get_fan()]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ds1620_exit(void)
|
|
{
|
|
#ifdef THERM_USE_PROC
|
|
remove_proc_entry("therm", NULL);
|
|
#endif
|
|
misc_deregister(&ds1620_miscdev);
|
|
}
|
|
|
|
module_init(ds1620_init);
|
|
module_exit(ds1620_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|