![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>
1022 lines
26 KiB
C
1022 lines
26 KiB
C
/*
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* I2C client/driver for the ST M41T80 family of i2c rtc chips.
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*
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* Author: Alexander Bigga <ab@mycable.de>
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*
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* Based on m41t00.c by Mark A. Greer <mgreer@mvista.com>
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*
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* 2006 (c) mycable GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/bcd.h>
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#include <linux/clk-provider.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#ifdef CONFIG_RTC_DRV_M41T80_WDT
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/miscdevice.h>
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#include <linux/reboot.h>
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#include <linux/watchdog.h>
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#endif
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#define M41T80_REG_SSEC 0x00
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#define M41T80_REG_SEC 0x01
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#define M41T80_REG_MIN 0x02
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#define M41T80_REG_HOUR 0x03
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#define M41T80_REG_WDAY 0x04
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#define M41T80_REG_DAY 0x05
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#define M41T80_REG_MON 0x06
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#define M41T80_REG_YEAR 0x07
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#define M41T80_REG_ALARM_MON 0x0a
|
|
#define M41T80_REG_ALARM_DAY 0x0b
|
|
#define M41T80_REG_ALARM_HOUR 0x0c
|
|
#define M41T80_REG_ALARM_MIN 0x0d
|
|
#define M41T80_REG_ALARM_SEC 0x0e
|
|
#define M41T80_REG_FLAGS 0x0f
|
|
#define M41T80_REG_SQW 0x13
|
|
|
|
#define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1)
|
|
#define M41T80_ALARM_REG_SIZE \
|
|
(M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON)
|
|
|
|
#define M41T80_SQW_MAX_FREQ 32768
|
|
|
|
#define M41T80_SEC_ST BIT(7) /* ST: Stop Bit */
|
|
#define M41T80_ALMON_AFE BIT(7) /* AFE: AF Enable Bit */
|
|
#define M41T80_ALMON_SQWE BIT(6) /* SQWE: SQW Enable Bit */
|
|
#define M41T80_ALHOUR_HT BIT(6) /* HT: Halt Update Bit */
|
|
#define M41T80_FLAGS_OF BIT(2) /* OF: Oscillator Failure Bit */
|
|
#define M41T80_FLAGS_AF BIT(6) /* AF: Alarm Flag Bit */
|
|
#define M41T80_FLAGS_BATT_LOW BIT(4) /* BL: Battery Low Bit */
|
|
#define M41T80_WATCHDOG_RB2 BIT(7) /* RB: Watchdog resolution */
|
|
#define M41T80_WATCHDOG_RB1 BIT(1) /* RB: Watchdog resolution */
|
|
#define M41T80_WATCHDOG_RB0 BIT(0) /* RB: Watchdog resolution */
|
|
|
|
#define M41T80_FEATURE_HT BIT(0) /* Halt feature */
|
|
#define M41T80_FEATURE_BL BIT(1) /* Battery low indicator */
|
|
#define M41T80_FEATURE_SQ BIT(2) /* Squarewave feature */
|
|
#define M41T80_FEATURE_WD BIT(3) /* Extra watchdog resolution */
|
|
#define M41T80_FEATURE_SQ_ALT BIT(4) /* RSx bits are in reg 4 */
|
|
|
|
static const struct i2c_device_id m41t80_id[] = {
|
|
{ "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT },
|
|
{ "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD },
|
|
{ "m41t80", M41T80_FEATURE_SQ },
|
|
{ "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ},
|
|
{ "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
|
|
{ "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
|
|
{ "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
|
|
{ "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
|
|
{ "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
|
|
{ "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ },
|
|
{ "rv4162", M41T80_FEATURE_SQ | M41T80_FEATURE_WD | M41T80_FEATURE_SQ_ALT },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, m41t80_id);
|
|
|
|
static const struct of_device_id m41t80_of_match[] = {
|
|
{
|
|
.compatible = "st,m41t62",
|
|
.data = (void *)(M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT)
|
|
},
|
|
{
|
|
.compatible = "st,m41t65",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_WD)
|
|
},
|
|
{
|
|
.compatible = "st,m41t80",
|
|
.data = (void *)(M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t81",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t81s",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t82",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t83",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t84",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t85",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "st,m41t87",
|
|
.data = (void *)(M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ)
|
|
},
|
|
{
|
|
.compatible = "microcrystal,rv4162",
|
|
.data = (void *)(M41T80_FEATURE_SQ | M41T80_FEATURE_WD | M41T80_FEATURE_SQ_ALT)
|
|
},
|
|
/* DT compatibility only, do not use compatibles below: */
|
|
{
|
|
.compatible = "st,rv4162",
|
|
.data = (void *)(M41T80_FEATURE_SQ | M41T80_FEATURE_WD | M41T80_FEATURE_SQ_ALT)
|
|
},
|
|
{
|
|
.compatible = "rv4162",
|
|
.data = (void *)(M41T80_FEATURE_SQ | M41T80_FEATURE_WD | M41T80_FEATURE_SQ_ALT)
|
|
},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, m41t80_of_match);
|
|
|
|
struct m41t80_data {
|
|
unsigned long features;
|
|
struct i2c_client *client;
|
|
struct rtc_device *rtc;
|
|
#ifdef CONFIG_COMMON_CLK
|
|
struct clk_hw sqw;
|
|
unsigned long freq;
|
|
unsigned int sqwe;
|
|
#endif
|
|
};
|
|
|
|
static irqreturn_t m41t80_handle_irq(int irq, void *dev_id)
|
|
{
|
|
struct i2c_client *client = dev_id;
|
|
struct m41t80_data *m41t80 = i2c_get_clientdata(client);
|
|
struct mutex *lock = &m41t80->rtc->ops_lock;
|
|
unsigned long events = 0;
|
|
int flags, flags_afe;
|
|
|
|
mutex_lock(lock);
|
|
|
|
flags_afe = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
|
|
if (flags_afe < 0) {
|
|
mutex_unlock(lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
|
if (flags <= 0) {
|
|
mutex_unlock(lock);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
if (flags & M41T80_FLAGS_AF) {
|
|
flags &= ~M41T80_FLAGS_AF;
|
|
flags_afe &= ~M41T80_ALMON_AFE;
|
|
events |= RTC_AF;
|
|
}
|
|
|
|
if (events) {
|
|
rtc_update_irq(m41t80->rtc, 1, events);
|
|
i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS, flags);
|
|
i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
|
|
flags_afe);
|
|
}
|
|
|
|
mutex_unlock(lock);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
unsigned char buf[8];
|
|
int err, flags;
|
|
|
|
flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
|
if (flags < 0)
|
|
return flags;
|
|
|
|
if (flags & M41T80_FLAGS_OF) {
|
|
dev_err(&client->dev, "Oscillator failure, data is invalid.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = i2c_smbus_read_i2c_block_data(client, M41T80_REG_SSEC,
|
|
sizeof(buf), buf);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "Unable to read date\n");
|
|
return err;
|
|
}
|
|
|
|
tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f);
|
|
tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f);
|
|
tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f);
|
|
tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f);
|
|
tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07;
|
|
tm->tm_mon = bcd2bin(buf[M41T80_REG_MON] & 0x1f) - 1;
|
|
|
|
/* assume 20YY not 19YY, and ignore the Century Bit */
|
|
tm->tm_year = bcd2bin(buf[M41T80_REG_YEAR]) + 100;
|
|
return 0;
|
|
}
|
|
|
|
static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct m41t80_data *clientdata = i2c_get_clientdata(client);
|
|
unsigned char buf[8];
|
|
int err, flags;
|
|
|
|
if (tm->tm_year < 100 || tm->tm_year > 199)
|
|
return -EINVAL;
|
|
|
|
buf[M41T80_REG_SSEC] = 0;
|
|
buf[M41T80_REG_SEC] = bin2bcd(tm->tm_sec);
|
|
buf[M41T80_REG_MIN] = bin2bcd(tm->tm_min);
|
|
buf[M41T80_REG_HOUR] = bin2bcd(tm->tm_hour);
|
|
buf[M41T80_REG_DAY] = bin2bcd(tm->tm_mday);
|
|
buf[M41T80_REG_MON] = bin2bcd(tm->tm_mon + 1);
|
|
buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year - 100);
|
|
buf[M41T80_REG_WDAY] = tm->tm_wday;
|
|
|
|
/* If the square wave output is controlled in the weekday register */
|
|
if (clientdata->features & M41T80_FEATURE_SQ_ALT) {
|
|
int val;
|
|
|
|
val = i2c_smbus_read_byte_data(client, M41T80_REG_WDAY);
|
|
if (val < 0)
|
|
return val;
|
|
|
|
buf[M41T80_REG_WDAY] |= (val & 0xf0);
|
|
}
|
|
|
|
err = i2c_smbus_write_i2c_block_data(client, M41T80_REG_SSEC,
|
|
sizeof(buf), buf);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "Unable to write to date registers\n");
|
|
return err;
|
|
}
|
|
|
|
/* Clear the OF bit of Flags Register */
|
|
flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
|
if (flags < 0)
|
|
return flags;
|
|
|
|
err = i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
|
|
flags & ~M41T80_FLAGS_OF);
|
|
if (err < 0) {
|
|
dev_err(&client->dev, "Unable to write flags register\n");
|
|
return err;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct m41t80_data *clientdata = i2c_get_clientdata(client);
|
|
int reg;
|
|
|
|
if (clientdata->features & M41T80_FEATURE_BL) {
|
|
reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
|
if (reg < 0)
|
|
return reg;
|
|
seq_printf(seq, "battery\t\t: %s\n",
|
|
(reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int m41t80_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
int flags, retval;
|
|
|
|
flags = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
|
|
if (flags < 0)
|
|
return flags;
|
|
|
|
if (enabled)
|
|
flags |= M41T80_ALMON_AFE;
|
|
else
|
|
flags &= ~M41T80_ALMON_AFE;
|
|
|
|
retval = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, flags);
|
|
if (retval < 0) {
|
|
dev_err(dev, "Unable to enable alarm IRQ %d\n", retval);
|
|
return retval;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int m41t80_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
u8 alarmvals[5];
|
|
int ret, err;
|
|
|
|
alarmvals[0] = bin2bcd(alrm->time.tm_mon + 1);
|
|
alarmvals[1] = bin2bcd(alrm->time.tm_mday);
|
|
alarmvals[2] = bin2bcd(alrm->time.tm_hour);
|
|
alarmvals[3] = bin2bcd(alrm->time.tm_min);
|
|
alarmvals[4] = bin2bcd(alrm->time.tm_sec);
|
|
|
|
/* Clear AF and AFE flags */
|
|
ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
|
|
if (ret < 0)
|
|
return ret;
|
|
err = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
|
|
ret & ~(M41T80_ALMON_AFE));
|
|
if (err < 0) {
|
|
dev_err(dev, "Unable to clear AFE bit\n");
|
|
return err;
|
|
}
|
|
|
|
/* Keep SQWE bit value */
|
|
alarmvals[0] |= (ret & M41T80_ALMON_SQWE);
|
|
|
|
ret = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
err = i2c_smbus_write_byte_data(client, M41T80_REG_FLAGS,
|
|
ret & ~(M41T80_FLAGS_AF));
|
|
if (err < 0) {
|
|
dev_err(dev, "Unable to clear AF bit\n");
|
|
return err;
|
|
}
|
|
|
|
/* Write the alarm */
|
|
err = i2c_smbus_write_i2c_block_data(client, M41T80_REG_ALARM_MON,
|
|
5, alarmvals);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Enable the alarm interrupt */
|
|
if (alrm->enabled) {
|
|
alarmvals[0] |= M41T80_ALMON_AFE;
|
|
err = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
|
|
alarmvals[0]);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m41t80_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
u8 alarmvals[5];
|
|
int flags, ret;
|
|
|
|
ret = i2c_smbus_read_i2c_block_data(client, M41T80_REG_ALARM_MON,
|
|
5, alarmvals);
|
|
if (ret != 5)
|
|
return ret < 0 ? ret : -EIO;
|
|
|
|
flags = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS);
|
|
if (flags < 0)
|
|
return flags;
|
|
|
|
alrm->time.tm_sec = bcd2bin(alarmvals[4] & 0x7f);
|
|
alrm->time.tm_min = bcd2bin(alarmvals[3] & 0x7f);
|
|
alrm->time.tm_hour = bcd2bin(alarmvals[2] & 0x3f);
|
|
alrm->time.tm_mday = bcd2bin(alarmvals[1] & 0x3f);
|
|
alrm->time.tm_mon = bcd2bin(alarmvals[0] & 0x3f) - 1;
|
|
|
|
alrm->enabled = !!(alarmvals[0] & M41T80_ALMON_AFE);
|
|
alrm->pending = (flags & M41T80_FLAGS_AF) && alrm->enabled;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct rtc_class_ops m41t80_rtc_ops = {
|
|
.read_time = m41t80_rtc_read_time,
|
|
.set_time = m41t80_rtc_set_time,
|
|
.proc = m41t80_rtc_proc,
|
|
};
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int m41t80_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (client->irq >= 0 && device_may_wakeup(dev))
|
|
enable_irq_wake(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m41t80_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (client->irq >= 0 && device_may_wakeup(dev))
|
|
disable_irq_wake(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(m41t80_pm, m41t80_suspend, m41t80_resume);
|
|
|
|
#ifdef CONFIG_COMMON_CLK
|
|
#define sqw_to_m41t80_data(_hw) container_of(_hw, struct m41t80_data, sqw)
|
|
|
|
static unsigned long m41t80_decode_freq(int setting)
|
|
{
|
|
return (setting == 0) ? 0 : (setting == 1) ? M41T80_SQW_MAX_FREQ :
|
|
M41T80_SQW_MAX_FREQ >> setting;
|
|
}
|
|
|
|
static unsigned long m41t80_get_freq(struct m41t80_data *m41t80)
|
|
{
|
|
struct i2c_client *client = m41t80->client;
|
|
int reg_sqw = (m41t80->features & M41T80_FEATURE_SQ_ALT) ?
|
|
M41T80_REG_WDAY : M41T80_REG_SQW;
|
|
int ret = i2c_smbus_read_byte_data(client, reg_sqw);
|
|
|
|
if (ret < 0)
|
|
return 0;
|
|
return m41t80_decode_freq(ret >> 4);
|
|
}
|
|
|
|
static unsigned long m41t80_sqw_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
return sqw_to_m41t80_data(hw)->freq;
|
|
}
|
|
|
|
static long m41t80_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *prate)
|
|
{
|
|
if (rate >= M41T80_SQW_MAX_FREQ)
|
|
return M41T80_SQW_MAX_FREQ;
|
|
if (rate >= M41T80_SQW_MAX_FREQ / 4)
|
|
return M41T80_SQW_MAX_FREQ / 4;
|
|
if (!rate)
|
|
return 0;
|
|
return 1 << ilog2(rate);
|
|
}
|
|
|
|
static int m41t80_sqw_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct m41t80_data *m41t80 = sqw_to_m41t80_data(hw);
|
|
struct i2c_client *client = m41t80->client;
|
|
int reg_sqw = (m41t80->features & M41T80_FEATURE_SQ_ALT) ?
|
|
M41T80_REG_WDAY : M41T80_REG_SQW;
|
|
int reg, ret, val = 0;
|
|
|
|
if (rate >= M41T80_SQW_MAX_FREQ)
|
|
val = 1;
|
|
else if (rate >= M41T80_SQW_MAX_FREQ / 4)
|
|
val = 2;
|
|
else if (rate)
|
|
val = 15 - ilog2(rate);
|
|
|
|
reg = i2c_smbus_read_byte_data(client, reg_sqw);
|
|
if (reg < 0)
|
|
return reg;
|
|
|
|
reg = (reg & 0x0f) | (val << 4);
|
|
|
|
ret = i2c_smbus_write_byte_data(client, reg_sqw, reg);
|
|
if (!ret)
|
|
m41t80->freq = m41t80_decode_freq(val);
|
|
return ret;
|
|
}
|
|
|
|
static int m41t80_sqw_control(struct clk_hw *hw, bool enable)
|
|
{
|
|
struct m41t80_data *m41t80 = sqw_to_m41t80_data(hw);
|
|
struct i2c_client *client = m41t80->client;
|
|
int ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (enable)
|
|
ret |= M41T80_ALMON_SQWE;
|
|
else
|
|
ret &= ~M41T80_ALMON_SQWE;
|
|
|
|
ret = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, ret);
|
|
if (!ret)
|
|
m41t80->sqwe = enable;
|
|
return ret;
|
|
}
|
|
|
|
static int m41t80_sqw_prepare(struct clk_hw *hw)
|
|
{
|
|
return m41t80_sqw_control(hw, 1);
|
|
}
|
|
|
|
static void m41t80_sqw_unprepare(struct clk_hw *hw)
|
|
{
|
|
m41t80_sqw_control(hw, 0);
|
|
}
|
|
|
|
static int m41t80_sqw_is_prepared(struct clk_hw *hw)
|
|
{
|
|
return sqw_to_m41t80_data(hw)->sqwe;
|
|
}
|
|
|
|
static const struct clk_ops m41t80_sqw_ops = {
|
|
.prepare = m41t80_sqw_prepare,
|
|
.unprepare = m41t80_sqw_unprepare,
|
|
.is_prepared = m41t80_sqw_is_prepared,
|
|
.recalc_rate = m41t80_sqw_recalc_rate,
|
|
.round_rate = m41t80_sqw_round_rate,
|
|
.set_rate = m41t80_sqw_set_rate,
|
|
};
|
|
|
|
static struct clk *m41t80_sqw_register_clk(struct m41t80_data *m41t80)
|
|
{
|
|
struct i2c_client *client = m41t80->client;
|
|
struct device_node *node = client->dev.of_node;
|
|
struct clk *clk;
|
|
struct clk_init_data init;
|
|
int ret;
|
|
|
|
/* First disable the clock */
|
|
ret = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
ret = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
|
|
ret & ~(M41T80_ALMON_SQWE));
|
|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
init.name = "m41t80-sqw";
|
|
init.ops = &m41t80_sqw_ops;
|
|
init.flags = 0;
|
|
init.parent_names = NULL;
|
|
init.num_parents = 0;
|
|
m41t80->sqw.init = &init;
|
|
m41t80->freq = m41t80_get_freq(m41t80);
|
|
|
|
/* optional override of the clockname */
|
|
of_property_read_string(node, "clock-output-names", &init.name);
|
|
|
|
/* register the clock */
|
|
clk = clk_register(&client->dev, &m41t80->sqw);
|
|
if (!IS_ERR(clk))
|
|
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
|
|
|
return clk;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_RTC_DRV_M41T80_WDT
|
|
/*
|
|
*****************************************************************************
|
|
*
|
|
* Watchdog Driver
|
|
*
|
|
*****************************************************************************
|
|
*/
|
|
static DEFINE_MUTEX(m41t80_rtc_mutex);
|
|
static struct i2c_client *save_client;
|
|
|
|
/* Default margin */
|
|
#define WD_TIMO 60 /* 1..31 seconds */
|
|
|
|
static int wdt_margin = WD_TIMO;
|
|
module_param(wdt_margin, int, 0);
|
|
MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)");
|
|
|
|
static unsigned long wdt_is_open;
|
|
static int boot_flag;
|
|
|
|
/**
|
|
* wdt_ping:
|
|
*
|
|
* Reload counter one with the watchdog timeout. We don't bother reloading
|
|
* the cascade counter.
|
|
*/
|
|
static void wdt_ping(void)
|
|
{
|
|
unsigned char i2c_data[2];
|
|
struct i2c_msg msgs1[1] = {
|
|
{
|
|
.addr = save_client->addr,
|
|
.flags = 0,
|
|
.len = 2,
|
|
.buf = i2c_data,
|
|
},
|
|
};
|
|
struct m41t80_data *clientdata = i2c_get_clientdata(save_client);
|
|
|
|
i2c_data[0] = 0x09; /* watchdog register */
|
|
|
|
if (wdt_margin > 31)
|
|
i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */
|
|
else
|
|
/*
|
|
* WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02)
|
|
*/
|
|
i2c_data[1] = wdt_margin << 2 | 0x82;
|
|
|
|
/*
|
|
* M41T65 has three bits for watchdog resolution. Don't set bit 7, as
|
|
* that would be an invalid resolution.
|
|
*/
|
|
if (clientdata->features & M41T80_FEATURE_WD)
|
|
i2c_data[1] &= ~M41T80_WATCHDOG_RB2;
|
|
|
|
i2c_transfer(save_client->adapter, msgs1, 1);
|
|
}
|
|
|
|
/**
|
|
* wdt_disable:
|
|
*
|
|
* disables watchdog.
|
|
*/
|
|
static void wdt_disable(void)
|
|
{
|
|
unsigned char i2c_data[2], i2c_buf[0x10];
|
|
struct i2c_msg msgs0[2] = {
|
|
{
|
|
.addr = save_client->addr,
|
|
.flags = 0,
|
|
.len = 1,
|
|
.buf = i2c_data,
|
|
},
|
|
{
|
|
.addr = save_client->addr,
|
|
.flags = I2C_M_RD,
|
|
.len = 1,
|
|
.buf = i2c_buf,
|
|
},
|
|
};
|
|
struct i2c_msg msgs1[1] = {
|
|
{
|
|
.addr = save_client->addr,
|
|
.flags = 0,
|
|
.len = 2,
|
|
.buf = i2c_data,
|
|
},
|
|
};
|
|
|
|
i2c_data[0] = 0x09;
|
|
i2c_transfer(save_client->adapter, msgs0, 2);
|
|
|
|
i2c_data[0] = 0x09;
|
|
i2c_data[1] = 0x00;
|
|
i2c_transfer(save_client->adapter, msgs1, 1);
|
|
}
|
|
|
|
/**
|
|
* wdt_write:
|
|
* @file: file handle to the watchdog
|
|
* @buf: buffer to write (unused as data does not matter here
|
|
* @count: count of bytes
|
|
* @ppos: pointer to the position to write. No seeks allowed
|
|
*
|
|
* A write to a watchdog device is defined as a keepalive signal. Any
|
|
* write of data will do, as we we don't define content meaning.
|
|
*/
|
|
static ssize_t wdt_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
if (count) {
|
|
wdt_ping();
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t wdt_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* wdt_ioctl:
|
|
* @inode: inode of the device
|
|
* @file: file handle to the device
|
|
* @cmd: watchdog command
|
|
* @arg: argument pointer
|
|
*
|
|
* The watchdog API defines a common set of functions for all watchdogs
|
|
* according to their available features. We only actually usefully support
|
|
* querying capabilities and current status.
|
|
*/
|
|
static int wdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int new_margin, rv;
|
|
static struct watchdog_info ident = {
|
|
.options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING |
|
|
WDIOF_SETTIMEOUT,
|
|
.firmware_version = 1,
|
|
.identity = "M41T80 WTD"
|
|
};
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
return copy_to_user((struct watchdog_info __user *)arg, &ident,
|
|
sizeof(ident)) ? -EFAULT : 0;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
case WDIOC_GETBOOTSTATUS:
|
|
return put_user(boot_flag, (int __user *)arg);
|
|
case WDIOC_KEEPALIVE:
|
|
wdt_ping();
|
|
return 0;
|
|
case WDIOC_SETTIMEOUT:
|
|
if (get_user(new_margin, (int __user *)arg))
|
|
return -EFAULT;
|
|
/* Arbitrary, can't find the card's limits */
|
|
if (new_margin < 1 || new_margin > 124)
|
|
return -EINVAL;
|
|
wdt_margin = new_margin;
|
|
wdt_ping();
|
|
/* Fall through */
|
|
case WDIOC_GETTIMEOUT:
|
|
return put_user(wdt_margin, (int __user *)arg);
|
|
|
|
case WDIOC_SETOPTIONS:
|
|
if (copy_from_user(&rv, (int __user *)arg, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
if (rv & WDIOS_DISABLECARD) {
|
|
pr_info("disable watchdog\n");
|
|
wdt_disable();
|
|
}
|
|
|
|
if (rv & WDIOS_ENABLECARD) {
|
|
pr_info("enable watchdog\n");
|
|
wdt_ping();
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static long wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&m41t80_rtc_mutex);
|
|
ret = wdt_ioctl(file, cmd, arg);
|
|
mutex_unlock(&m41t80_rtc_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* wdt_open:
|
|
* @inode: inode of device
|
|
* @file: file handle to device
|
|
*
|
|
*/
|
|
static int wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
|
|
mutex_lock(&m41t80_rtc_mutex);
|
|
if (test_and_set_bit(0, &wdt_is_open)) {
|
|
mutex_unlock(&m41t80_rtc_mutex);
|
|
return -EBUSY;
|
|
}
|
|
/*
|
|
* Activate
|
|
*/
|
|
wdt_is_open = 1;
|
|
mutex_unlock(&m41t80_rtc_mutex);
|
|
return stream_open(inode, file);
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* wdt_close:
|
|
* @inode: inode to board
|
|
* @file: file handle to board
|
|
*
|
|
*/
|
|
static int wdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
if (MINOR(inode->i_rdev) == WATCHDOG_MINOR)
|
|
clear_bit(0, &wdt_is_open);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* notify_sys:
|
|
* @this: our notifier block
|
|
* @code: the event being reported
|
|
* @unused: unused
|
|
*
|
|
* Our notifier is called on system shutdowns. We want to turn the card
|
|
* off at reboot otherwise the machine will reboot again during memory
|
|
* test or worse yet during the following fsck. This would suck, in fact
|
|
* trust me - if it happens it does suck.
|
|
*/
|
|
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
|
|
void *unused)
|
|
{
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
/* Disable Watchdog */
|
|
wdt_disable();
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static const struct file_operations wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = wdt_read,
|
|
.unlocked_ioctl = wdt_unlocked_ioctl,
|
|
.write = wdt_write,
|
|
.open = wdt_open,
|
|
.release = wdt_release,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static struct miscdevice wdt_dev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &wdt_fops,
|
|
};
|
|
|
|
/*
|
|
* The WDT card needs to learn about soft shutdowns in order to
|
|
* turn the timebomb registers off.
|
|
*/
|
|
static struct notifier_block wdt_notifier = {
|
|
.notifier_call = wdt_notify_sys,
|
|
};
|
|
#endif /* CONFIG_RTC_DRV_M41T80_WDT */
|
|
|
|
/*
|
|
*****************************************************************************
|
|
*
|
|
* Driver Interface
|
|
*
|
|
*****************************************************************************
|
|
*/
|
|
|
|
static int m41t80_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
|
|
int rc = 0;
|
|
struct rtc_time tm;
|
|
struct m41t80_data *m41t80_data = NULL;
|
|
bool wakeup_source = false;
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_I2C_BLOCK |
|
|
I2C_FUNC_SMBUS_BYTE_DATA)) {
|
|
dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
m41t80_data = devm_kzalloc(&client->dev, sizeof(*m41t80_data),
|
|
GFP_KERNEL);
|
|
if (!m41t80_data)
|
|
return -ENOMEM;
|
|
|
|
m41t80_data->client = client;
|
|
if (client->dev.of_node)
|
|
m41t80_data->features = (unsigned long)
|
|
of_device_get_match_data(&client->dev);
|
|
else
|
|
m41t80_data->features = id->driver_data;
|
|
i2c_set_clientdata(client, m41t80_data);
|
|
|
|
m41t80_data->rtc = devm_rtc_allocate_device(&client->dev);
|
|
if (IS_ERR(m41t80_data->rtc))
|
|
return PTR_ERR(m41t80_data->rtc);
|
|
|
|
#ifdef CONFIG_OF
|
|
wakeup_source = of_property_read_bool(client->dev.of_node,
|
|
"wakeup-source");
|
|
#endif
|
|
if (client->irq > 0) {
|
|
rc = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, m41t80_handle_irq,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
"m41t80", client);
|
|
if (rc) {
|
|
dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
|
|
client->irq = 0;
|
|
wakeup_source = false;
|
|
}
|
|
}
|
|
if (client->irq > 0 || wakeup_source) {
|
|
m41t80_rtc_ops.read_alarm = m41t80_read_alarm;
|
|
m41t80_rtc_ops.set_alarm = m41t80_set_alarm;
|
|
m41t80_rtc_ops.alarm_irq_enable = m41t80_alarm_irq_enable;
|
|
/* Enable the wakealarm */
|
|
device_init_wakeup(&client->dev, true);
|
|
}
|
|
|
|
m41t80_data->rtc->ops = &m41t80_rtc_ops;
|
|
|
|
if (client->irq <= 0) {
|
|
/* We cannot support UIE mode if we do not have an IRQ line */
|
|
m41t80_data->rtc->uie_unsupported = 1;
|
|
}
|
|
|
|
/* Make sure HT (Halt Update) bit is cleared */
|
|
rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR);
|
|
|
|
if (rc >= 0 && rc & M41T80_ALHOUR_HT) {
|
|
if (m41t80_data->features & M41T80_FEATURE_HT) {
|
|
m41t80_rtc_read_time(&client->dev, &tm);
|
|
dev_info(&client->dev, "HT bit was set!\n");
|
|
dev_info(&client->dev, "Power Down at %ptR\n", &tm);
|
|
}
|
|
rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_HOUR,
|
|
rc & ~M41T80_ALHOUR_HT);
|
|
}
|
|
|
|
if (rc < 0) {
|
|
dev_err(&client->dev, "Can't clear HT bit\n");
|
|
return rc;
|
|
}
|
|
|
|
/* Make sure ST (stop) bit is cleared */
|
|
rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC);
|
|
|
|
if (rc >= 0 && rc & M41T80_SEC_ST)
|
|
rc = i2c_smbus_write_byte_data(client, M41T80_REG_SEC,
|
|
rc & ~M41T80_SEC_ST);
|
|
if (rc < 0) {
|
|
dev_err(&client->dev, "Can't clear ST bit\n");
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_RTC_DRV_M41T80_WDT
|
|
if (m41t80_data->features & M41T80_FEATURE_HT) {
|
|
save_client = client;
|
|
rc = misc_register(&wdt_dev);
|
|
if (rc)
|
|
return rc;
|
|
rc = register_reboot_notifier(&wdt_notifier);
|
|
if (rc) {
|
|
misc_deregister(&wdt_dev);
|
|
return rc;
|
|
}
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_COMMON_CLK
|
|
if (m41t80_data->features & M41T80_FEATURE_SQ)
|
|
m41t80_sqw_register_clk(m41t80_data);
|
|
#endif
|
|
|
|
rc = rtc_register_device(m41t80_data->rtc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int m41t80_remove(struct i2c_client *client)
|
|
{
|
|
#ifdef CONFIG_RTC_DRV_M41T80_WDT
|
|
struct m41t80_data *clientdata = i2c_get_clientdata(client);
|
|
|
|
if (clientdata->features & M41T80_FEATURE_HT) {
|
|
misc_deregister(&wdt_dev);
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
}
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver m41t80_driver = {
|
|
.driver = {
|
|
.name = "rtc-m41t80",
|
|
.of_match_table = of_match_ptr(m41t80_of_match),
|
|
.pm = &m41t80_pm,
|
|
},
|
|
.probe = m41t80_probe,
|
|
.remove = m41t80_remove,
|
|
.id_table = m41t80_id,
|
|
};
|
|
|
|
module_i2c_driver(m41t80_driver);
|
|
|
|
MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>");
|
|
MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver");
|
|
MODULE_LICENSE("GPL");
|