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* Merge tag 'driver-core-6.3-rc1' of ↵Linus Torvalds2023-02-241-5/+5
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core Pull driver core updates from Greg KH: "Here is the large set of driver core changes for 6.3-rc1. There's a lot of changes this development cycle, most of the work falls into two different categories: - fw_devlink fixes and updates. This has gone through numerous review cycles and lots of review and testing by lots of different devices. Hopefully all should be good now, and Saravana will be keeping a watch for any potential regression on odd embedded systems. - driver core changes to work to make struct bus_type able to be moved into read-only memory (i.e. const) The recent work with Rust has pointed out a number of areas in the driver core where we are passing around and working with structures that really do not have to be dynamic at all, and they should be able to be read-only making things safer overall. This is the contuation of that work (started last release with kobject changes) in moving struct bus_type to be constant. We didn't quite make it for this release, but the remaining patches will be finished up for the release after this one, but the groundwork has been laid for this effort. Other than that we have in here: - debugfs memory leak fixes in some subsystems - error path cleanups and fixes for some never-able-to-be-hit codepaths. - cacheinfo rework and fixes - Other tiny fixes, full details are in the shortlog All of these have been in linux-next for a while with no reported problems" [ Geert Uytterhoeven points out that that last sentence isn't true, and that there's a pending report that has a fix that is queued up - Linus ] * tag 'driver-core-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (124 commits) debugfs: drop inline constant formatting for ERR_PTR(-ERROR) OPP: fix error checking in opp_migrate_dentry() debugfs: update comment of debugfs_rename() i3c: fix device.h kernel-doc warnings dma-mapping: no need to pass a bus_type into get_arch_dma_ops() driver core: class: move EXPORT_SYMBOL_GPL() lines to the correct place Revert "driver core: add error handling for devtmpfs_create_node()" Revert "devtmpfs: add debug info to handle()" Revert "devtmpfs: remove return value of devtmpfs_delete_node()" driver core: cpu: don't hand-override the uevent bus_type callback. devtmpfs: remove return value of devtmpfs_delete_node() devtmpfs: add debug info to handle() driver core: add error handling for devtmpfs_create_node() driver core: bus: update my copyright notice driver core: bus: add bus_get_dev_root() function driver core: bus: constify bus_unregister() driver core: bus: constify some internal functions driver core: bus: constify bus_get_kset() driver core: bus: constify bus_register/unregister_notifier() driver core: remove private pointer from struct bus_type ...
| * driver core: make struct bus_type.uevent() take a const *Greg Kroah-Hartman2023-01-271-5/+5
| | | | | | | | | | | | | | | | | | | | | | | | The uevent() callback in struct bus_type should not be modifying the device that is passed into it, so mark it as a const * and propagate the function signature changes out into all relevant subsystems that use this callback. Acked-by: Rafael J. Wysocki <rafael@kernel.org> Acked-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20230111113018.459199-16-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | Merge tag 'arm-boardfile-remove-6.3' of ↵Linus Torvalds2023-02-203-683/+0
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc Pull ARM SoC boardfile updates from Arnd Bergmann "Unused boardfile removal for 6.3 This is a follow-up to the deprecation of most of the old-style board files that was merged in linux-6.0, removing them for good. This branch is almost exclusively dead code removal based on those annotations. Some device driver removals went through separate subsystem trees, but the majority is in the same branch, in order to better handle dependencies between the patches and avoid breaking bisection. Unfortunately that leads to merge conflicts against other changes in the subsystem trees, but they should all be trivial to resolve by removing the files. See commit 7d0d3fa7339e ("Merge tag 'arm-boardfiles-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc") for the description of which machines were marked unused and are now removed. The only removals that got postponed are Terastation WXL (mv78xx0) and Jornada720 (StrongARM1100), which turned out to still have potential users" * tag 'arm-boardfile-remove-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (91 commits) mmc: omap: drop TPS65010 dependency ARM: pxa: restore mfp-pxa320.h usb: ohci-omap: avoid unused-variable warning ARM: debug: remove references in DEBUG_UART_8250_SHIFT to removed configs ARM: s3c: remove obsolete s3c-cpu-freq header MAINTAINERS: adjust SAMSUNG SOC CLOCK DRIVERS after s3c24xx support removal MAINTAINERS: update file entries after arm multi-platform rework and mach-pxa removal ARM: remove CONFIG_UNUSED_BOARD_FILES mfd: remove htc-pasic3 driver w1: remove ds1wm driver usb: remove ohci-tmio driver fbdev: remove w100fb driver fbdev: remove tmiofb driver mmc: remove tmio_mmc driver mfd: remove ucb1400 support mfd: remove toshiba tmio drivers rtc: remove v3020 driver power: remove pda_power supply driver ASoC: pxa: remove unused board support pcmcia: remove unused pxa/sa1100 drivers ...
| * w1: remove ds1wm driverArnd Bergmann2023-02-013-683/+0
| | | | | | | | | | | | | | | | | | | | | | This driver was used by the mfd/asic3 and mfd/htc-pasic3 drivers, but both of those are removed as part of the PXA spring cleaning, which leaves the w1 support orphaned as well. Cc: Evgeniy Polyakov <zbr@ioremap.net> Cc: Szabolcs Gyurko <szabolcs.gyurko@tlt.hu> Acked-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* | w1: fix WARNING after calling w1_process()Yang Yingliang2023-01-191-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I got the following WARNING message while removing driver(ds2482): ------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [<000000002d50bfb6>] w1_process+0x9e/0x1d0 [wire] WARNING: CPU: 0 PID: 262 at kernel/sched/core.c:9817 __might_sleep+0x98/0xa0 CPU: 0 PID: 262 Comm: w1_bus_master1 Tainted: G N 6.1.0-rc3+ #307 RIP: 0010:__might_sleep+0x98/0xa0 Call Trace: exit_signals+0x6c/0x550 do_exit+0x2b4/0x17e0 kthread_exit+0x52/0x60 kthread+0x16d/0x1e0 ret_from_fork+0x1f/0x30 The state of task is set to TASK_INTERRUPTIBLE in loop in w1_process(), set it to TASK_RUNNING when it breaks out of the loop to avoid the warning. Fixes: 3c52e4e62789 ("W1: w1_process, block or sleep") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20221205101558.3599162-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | w1: fix deadloop in __w1_remove_master_device()Yang Yingliang2023-01-192-3/+4
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I got a deadloop report while doing device(ds2482) add/remove test: [ 162.241881] w1_master_driver w1_bus_master1: Waiting for w1_bus_master1 to become free: refcnt=1. [ 163.272251] w1_master_driver w1_bus_master1: Waiting for w1_bus_master1 to become free: refcnt=1. [ 164.296157] w1_master_driver w1_bus_master1: Waiting for w1_bus_master1 to become free: refcnt=1. ... __w1_remove_master_device() can't return, because the dev->refcnt is not zero. w1_add_master_device() | w1_alloc_dev() | atomic_set(&dev->refcnt, 2) | kthread_run() | |__w1_remove_master_device() | kthread_stop() // KTHREAD_SHOULD_STOP is set, | // threadfn(w1_process) won't be | // called. | kthread() | | // refcnt will never be 0, it's deadloop. | while (atomic_read(&dev->refcnt)) {...} After calling w1_add_master_device(), w1_process() is not really invoked, before w1_process() starting, if kthread_stop() is called in __w1_remove_master_device(), w1_process() will never be called, the refcnt can not be decreased, then it causes deadloop in remove function because of non-zero refcnt. We need to make sure w1_process() is really started, so move the set refcnt into w1_process() to fix this problem. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20221205080434.3149205-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Merge tag 'char-misc-6.1-rc1' of ↵Linus Torvalds2022-10-081-1/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc Pull char/misc and other driver updates from Greg KH: "Here is the large set of char/misc and other small driver subsystem changes for 6.1-rc1. Loads of different things in here: - IIO driver updates, additions, and changes. Probably the largest part of the diffstat - habanalabs driver update with support for new hardware and features, the second largest part of the diff. - fpga subsystem driver updates and additions - mhi subsystem updates - Coresight driver updates - gnss subsystem updates - extcon driver updates - icc subsystem updates - fsi subsystem updates - nvmem subsystem and driver updates - misc driver updates - speakup driver additions for new features - lots of tiny driver updates and cleanups All of these have been in the linux-next tree for a while with no reported issues" * tag 'char-misc-6.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (411 commits) w1: Split memcpy() of struct cn_msg flexible array spmi: pmic-arb: increase SPMI transaction timeout delay spmi: pmic-arb: block access for invalid PMIC arbiter v5 SPMI writes spmi: pmic-arb: correct duplicate APID to PPID mapping logic spmi: pmic-arb: add support to dispatch interrupt based on IRQ status spmi: pmic-arb: check apid against limits before calling irq handler spmi: pmic-arb: do not ack and clear peripheral interrupts in cleanup_irq spmi: pmic-arb: handle spurious interrupt spmi: pmic-arb: add a print in cleanup_irq drivers: spmi: Directly use ida_alloc()/free() MAINTAINERS: add TI ECAP driver info counter: ti-ecap-capture: capture driver support for ECAP Documentation: ABI: sysfs-bus-counter: add frequency & num_overflows items dt-bindings: counter: add ti,am62-ecap-capture.yaml counter: Introduce the COUNTER_COMP_ARRAY component type counter: Consolidate Counter extension sysfs attribute creation counter: Introduce the Count capture component counter: 104-quad-8: Add Signal polarity component counter: Introduce the Signal polarity component counter: interrupt-cnt: Implement watch_validate callback ...
| * w1: Split memcpy() of struct cn_msg flexible arrayKees Cook2022-09-301-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To work around a misbehavior of the compiler's ability to see into composite flexible array structs (as detailed in the coming memcpy() hardening series[1]), split the memcpy() of the header and the payload so no false positive run-time overflow warning will be generated. [1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org/ Cc: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20220927003927.1942170-1-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | i2c: Make remove callback return voidUwe Kleine-König2022-08-161-2/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The value returned by an i2c driver's remove function is mostly ignored. (Only an error message is printed if the value is non-zero that the error is ignored.) So change the prototype of the remove function to return no value. This way driver authors are not tempted to assume that passing an error to the upper layer is a good idea. All drivers are adapted accordingly. There is no intended change of behaviour, all callbacks were prepared to return 0 before. Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com> Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Reviewed-by: Crt Mori <cmo@melexis.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013 Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/* Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5 Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860 Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power Acked-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@kernel.org>
* w1/ds2490: remove dump from ds_recv_status, pr_ to dev_XXX logging.Christian Vogel2022-04-241-60/+64
| | | | | | | | | | | | | | Changed all remaining pr_XXX calls that write out debugging info into dev_XXX calls, changed the needlessly verbose decoding of status bits into dev_dbg(), so that it's supressed by the logging levels by default. Forthermore the ds_recv_status function has a "dump" parameter that enables extremely verbose logging, and that's used only once. This has been factored out, and called explicitly at that one place. Signed-off-by: Christian Vogel <vogelchr@vogel.cx> Link: https://lore.kernel.org/r/20220324193246.16814-2-vogelchr@vogel.cx Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: Add support for Maxim MAX31850 thermoelement IF.Markus Reichl2022-03-181-2/+68
| | | | | | | | | | | MAX31850 shares family number 0x3B with DS1825. The device is generally compatible with DS1825 but needs a different temperature readout. It operates always in 14 bit mode and has all 4 higher bits of the Config register set to 1. Conversion time is 100ms. Signed-off-by: Markus Reichl <m.reichl@fivetechno.de> Link: https://lore.kernel.org/r/20220306145817.8753-1-m.reichl@fivetechno.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1/ds2490: remove spurious newlines within hexdumpChristian Vogel2022-03-181-5/+3
| | | | | | | | | | | | | | | | | | | | | Multiple pr_infos generate newlines, so the hexdump looks like... > 0x81: count=16, status: > 01 > 00 > 20 (...16 lines...) We switch to a single %*ph hexdump, using the built-in %ph format, which leads to this: [52769.348789] usb 2-1.3.1: Clearing ep0x83. [52769.349729] usb 2-1.3.1: ep_status=0x81, count=16,... ...status=01:00:20:40:05:04:04:00:20:53:00:00:00:00:00:00 Signed-off-by: Christian Vogel <vogelchr@vogel.cx> Link: https://lore.kernel.org/r/20220311192833.1792-2-vogelchr@vogel.cx Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: fixes w1_seq for ds28ea00 sensorsLucas Denefle2022-02-251-2/+6
| | | | | | | | | | | w1_seq was failing due to several devices responding to the CHAIN_DONE at the same time. Now properly selects the current device in the chain with MATCH_ROM. Also acknowledgment was read twice. Signed-off-by: Lucas Denefle <lucas.denefle@converge.io> Link: https://lore.kernel.org/r/20220223113558.232750-1-lucas.denefle@converge.io Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: use swap() to make code cleanerYang Guang2021-12-211-4/+3
| | | | | | | | | | | Use the macro 'swap()' defined in 'include/linux/minmax.h' to avoid opencoding it. Reported-by: Zeal Robot <zealci@zte.com.cn> Signed-off-by: David Yang <davidcomponentone@gmail.com> Signed-off-by: Yang Guang <yang.guang5@zte.com.cn> Link: https://lore.kernel.org/r/cb14f9e6e86cf8494ed2ddce6eec8ebd988908d9.1640077704.git.yang.guang5@zte.com.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Misuse of get_user()/put_user() reported by sparseChristophe Leroy2021-12-031-20/+6
| | | | | | | | | | | | | | | | | | | | | sparse warnings: (new ones prefixed by >>) >> drivers/w1/slaves/w1_ds28e04.c:342:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected char [noderef] __user *_pu_addr @@ got char *buf @@ drivers/w1/slaves/w1_ds28e04.c:342:13: sparse: expected char [noderef] __user *_pu_addr drivers/w1/slaves/w1_ds28e04.c:342:13: sparse: got char *buf >> drivers/w1/slaves/w1_ds28e04.c:356:13: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected char const [noderef] __user *_gu_addr @@ got char const *buf @@ drivers/w1/slaves/w1_ds28e04.c:356:13: sparse: expected char const [noderef] __user *_gu_addr drivers/w1/slaves/w1_ds28e04.c:356:13: sparse: got char const *buf The buffer buf is a failsafe buffer in kernel space, it's not user memory hence doesn't deserve the use of get_user() or put_user(). Access 'buf' content directly. Link: https://lore.kernel.org/lkml/202111190526.K5vb7NWC-lkp@intel.com/T/ Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Link: https://lore.kernel.org/r/d14ed8d71ad4372e6839ae427f91441d3ba0e94d.1637946316.git.christophe.leroy@csgroup.eu Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2482: fix kernel-doc syntax in fileAditya Srivastava2021-05-261-47/+47
| | | | | | | | | | | | | | | | | The opening comment mark '/**' is used for highlighting the beginning of kernel-doc comments. The comments for drivers/w1/masters/ds2482.c follows this syntax, but the content inside does not comply with kernel-doc. Similarly, the syntax for function and arguments declaration as well. Fix all such occurrences appropriately. Tested-by: Randy Dunlap <rdunlap@infradead.org> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Aditya Srivastava <yashsri421@gmail.com> Link: https://lore.kernel.org/r/20210523150122.21160-1-yashsri421@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2438: support for writing to offset registerLuiz Sampaio2021-05-211-0/+49
| | | | | | | | | | | | | | | Added a sysfs entry to support writing to the offset register on page1. This register is used to calibrate the chip canceling offset errors in the current ADC. This means that, over time, reading the IAD register will not return the correct current measurement, it will have an offset. Writing to the offset register if the two's complement of the current register while passing zero current to the load will calibrate the measurements. This change was tested on real hardware and it was able to calibrate the chip correctly. Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com> Link: https://lore.kernel.org/r/20210519223046.13798-7-sampaio.ime@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2438: adding support for reading page1Luiz Sampaio2021-05-211-0/+41
| | | | | | | | | | | Added a sysfs entry to support reading the page1 registers. This registers contain Elapsed Time Meter (ETM) data, which shows for how long the chip is on, as well as an Offset Register data, which can be used to calibrate the current measurement of the chip. Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com> Link: https://lore.kernel.org/r/20210519223046.13798-6-sampaio.ime@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2438: fixing bug that would always get page0Luiz Sampaio2021-05-211-2/+2
| | | | | | | | | | | The purpose of the w1_ds2438_get_page function is to get the register values at the page passed as the pageno parameter. However, the page0 was hardcoded, such that the function always returned the page0 contents. Fixed so that the function can retrieve any page. Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com> Link: https://lore.kernel.org/r/20210519223046.13798-5-sampaio.ime@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2438: changed sysfs macro for rw fileLuiz Sampaio2021-05-211-1/+1
| | | | | | | | | The iad sysfs file has permissions for read and write. Changed to the recommended macro BIN_ATTR_RW. Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com> Link: https://lore.kernel.org/r/20210519223046.13798-4-sampaio.ime@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2438: fixed if brackets coding style issueLuiz Sampaio2021-05-211-8/+8
| | | | | | | | | Since there is only one statement inside the if clause, no brackets are required. Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com> Link: https://lore.kernel.org/r/20210519223046.13798-3-sampaio.ime@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2438: fixed a coding style issueLuiz Sampaio2021-05-211-5/+5
| | | | | | | | | There is an if statement and, if the function goes into it, it returns. So, the next else is not required. Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com> Link: https://lore.kernel.org/r/20210519223046.13798-2-sampaio.ime@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: fix build warning in w1_seq_show()Yang Yingliang2021-05-211-2/+1
| | | | | | | | | | | | | Fix the following build warning: drivers/w1/slaves/w1_therm.c: In function ‘w1_seq_show’: drivers/w1/slaves/w1_therm.c:2059:6: warning: variable ‘rv’ set but not used [-Wunused-but-set-variable] int rv; ^~ Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20210518050415.615783-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: correct function name bulk_read_support()Yang Yingliang2021-05-211-1/+1
| | | | | | | | | | Fix the following make W=1 kernel build warning: drivers/w1/slaves/w1_therm.c:843: warning: expecting prototype for support_bulk_read(). Prototype was for bulk_read_support() instead Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Link: https://lore.kernel.org/r/20210518050401.615648-1-yangyingliang@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds28e17: Use module_w1_family to simplify the codeChen Huang2021-04-101-15/+1
| | | | | | | | | module_w1_family() makes the code simpler by eliminating boilerplate code. Signed-off-by: Chen Huang <chenhuang5@huawei.com> Link: https://lore.kernel.org/r/20210408130954.1158963-2-chenhuang5@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: ds2805: Use module_w1_family to simplify the codeChen Huang2021-04-101-14/+1
| | | | | | | | | module_w1_family() makes the code simpler by eliminating boilerplate code. Signed-off-by: Chen Huang <chenhuang5@huawei.com> Link: https://lore.kernel.org/r/20210408130954.1158963-1-chenhuang5@huawei.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: slaves: Typo fixesBhaskar Chowdhury2021-03-241-2/+2
| | | | | | | | | s/mesured/measured/ .......twice Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com> Link: https://lore.kernel.org/r/20210319052554.966-1-unixbhaskar@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Use kobj_to_dev()[RESEND]dongjian2021-03-242-2/+2
| | | | | | | | Use kobj_to_dev() instead of open-coding it Signed-off-by: dongjian <dongjian@yulong.com> Link: https://lore.kernel.org/r/1615877987-32163-1-git-send-email-dj0227@163.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: use clamp() in int_to_short()Dan Carpenter2021-03-241-2/+1
| | | | | | | | | It's slightly cleaner to use the clamp() macro instead of open coding this. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/YEedHNwqEH8fvjkD@mwanda Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: Fix conversion result for negative temperaturesIvan Zaentsev2021-01-271-13/+9
| | | | | | | | | | | | | | DS18B20 device driver returns an incorrect value for negative temperatures due to a missing sign-extension in w1_DS18B20_convert_temp(). Fix by using s16 temperature value when converting to int. Fixes: 9ace0b4dab1c (w1: w1_therm: Add support for GXCAS GX20MH01 device.) Cc: stable <stable@vger.kernel.org> Reported-by: Paweł Marciniak <sunwire@gmail.com> Signed-off-by: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru> Link: https://lore.kernel.org/r/20210121093021.224764-1-ivan.zaentsev@wirenboard.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1/masters/ds2490: queue up found IDs during scanChristian Vogel2021-01-201-5/+20
| | | | | | | | | | | | Queue up found IDs in a buffer and run the callback once for each found ID at the end. This is necessary because we hold the bus_mutex during the whole scan, and some of the "add-device" callbacks deadlock as they themselves want to mutex_lock(bus_mutex). Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Christian Vogel <vogelchr@vogel.cx> Link: https://lore.kernel.org/r/20210113195018.7498-3-vogelchr@vogel.cx Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1/w1.c: w1 address crc quick for DS28E04 eepromsChristian Vogel2021-01-201-2/+37
| | | | | | | | | | | | | | | | | | Onewire addresses are 64bit family(8bit), unique_id(48bit), crc(8bit) (LSBt to MSB) and self-consistent: crc = crc8(family, unique). DS28E04-100 4096-Bit Addressable 1-Wire EEPROM with PIO have strap pins to set 7 LSB of the address, unfortunately without updating the crc part of the address. It is only consistent if all strap pins float high. [see datasheet 19-6134; Rev 12/11 page 6: 64-bit device id number] We therefore introduce a special handling of family 0x1c (DS28E04) to check address consistency with 7 LSBs of the unique_id set to 1. Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Christian Vogel <vogelchr@vogel.cx> Link: https://lore.kernel.org/r/20210113195018.7498-2-vogelchr@vogel.cx Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: Rename conflicting sysfs attribute 'eeprom' to 'eeprom_cmd'Ivan Zaentsev2020-11-121-6/+6
| | | | | | | | | | | | | | | | | | Duplicate attribute 'eeprom' is defined in: 1) Documentation/ABI/testing/sysfs-driver-w1_therm 2) Documentation/ABI/stable/sysfs-driver-w1_ds28e04 Both drivers define an attribute: /sys/bus/w1/devices/.../eeprom with conflicting behavior. Fix by renaming the newer one in w1_therm.c to 'eeprom_cmd'. Reported-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/lkml/20201029152845.6bbb39ce@coco.lan/ Signed-off-by: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru> Link: https://lore.kernel.org/r/20201112064931.8471-1-ivan.zaentsev@wirenboard.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: make w1_poll_completion staticGreg Kroah-Hartman2020-10-051-1/+1
| | | | | | | | | | kernel test robot rightly points out that w1_poll_completion() should be static, so mark it as such. Cc: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru> Reported-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/r/20201005123703.GA800532@kroah.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Constify static w1_family_ops structsRikard Falkeborn2020-10-0517-19/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only usage of these structs is to assign their address to the fops field in the w1_family struct, which is a const pointer. Make them const to allow the compiler to put them in read-only memory. This was done with the following Coccinelle semantic patch (http://coccinelle.lip6.fr/): // <smpl> @r1 disable optional_qualifier @ identifier i; position p; @@ static struct w1_family_ops i@p = {...}; @ok1@ identifier r1.i; position p; identifier s; @@ static struct w1_family s = { .fops=&i@p, }; @bad1@ position p!={r1.p,ok1.p}; identifier r1.i; @@ i@p @depends on !bad1 disable optional_qualifier@ identifier r1.i; @@ static +const struct w1_family_ops i={}; // </smpl> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com> Link: https://lore.kernel.org/r/20201004193202.4044-3-rikard.falkeborn@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Constify struct w1_family_opsRikard Falkeborn2020-10-051-1/+1
| | | | | | | | | | | | The fops field in the w1_family struct is never modified. Make it const to indicate that. Constifying the pointer makes it possible for drivers to declare static w1_family_ops structs const, which in turn will allow the compiler to put it in read-only memory. Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com> Link: https://lore.kernel.org/r/20201004193202.4044-2-rikard.falkeborn@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: mxc_w1: Fix timeout resolution problem leading to bus errorMartin Fuzzey2020-10-021-7/+7
| | | | | | | | | | | | | | | | | | | | On my platform (i.MX53) bus access sometimes fails with w1_search: max_slave_count 64 reached, will continue next search. The reason is the use of jiffies to implement a 200us timeout in mxc_w1_ds2_touch_bit(). On some platforms the jiffies timer resolution is insufficient for this. Fix by replacing jiffies by ktime_get(). For consistency apply the same change to the other use of jiffies in mxc_w1_ds2_reset_bus(). Fixes: f80b2581a706 ("w1: mxc_w1: Optimize mxc_w1_ds2_touch_bit()") Cc: stable <stable@vger.kernel.org> Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group> Link: https://lore.kernel.org/r/1601455030-6607-1-git-send-email-martin.fuzzey@flowbird.group Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: Add support for GXCAS GX20MH01 device.Ivan Zaentsev2020-10-021-28/+78
| | | | | | | | | | | | GX20MH01 device shares family number 0x28 with DS18B20. The device is generally compatible with DS18B20. Added are the lowest 2^-5, 2^-6 temperature bits in Config register; R2 bit in Config register enabling 13 and 14 bit resolutions. It is powered up in 14 bit mode. Signed-off-by: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru> Link: https://lore.kernel.org/r/20200904160004.87710-2-ivan.zaentsev@wirenboard.ru Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: w1_therm: Add sysfs entries to control conversion time and driver featuresIvan Zaentsev2020-10-021-26/+331
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The conversion time of common DS18B20 clones deviates from datasheet specs. Allow adjustment and automatic measure of the conversion time. Add 'conv_time' sysfs attribute: *read*: Current conversion time in milliseconds. *write*: '0': Set default conversion time. '1': Measure and set the conversion time. Make a single temperature conversion, poll and measure an actual value. Measured value is increased by 20% for temperature drift. A new conversion time is returned by reading the same attribute. other positive value: Set the conversion time in milliseconds. The setting is active until a resolution change. Then it is reset to default conversion time for a new resolution. Add 'features' sysfs attribute to control optional driver settings per device. Bit masks to read/write (logical OR): 1: Enable check for conversion success. If byte 6 of scratchpad memory is 0xC after conversion, and temperature reads 85.00 (powerup value) or 127.94 (insufficient power) - return a conversion error. 2: Enable poll for conversion completion. Generate read cycles after the conversion start and wait for 1's. In parasite power mode this feature is not available. There are some clones of DS18B20 with fixed 12 bit resolution. Make the driver verify the resolution by reading back the device after resolution change. Signed-off-by: Ivan Zaentsev <ivan.zaentsev@wirenboard.ru> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Link: https://lore.kernel.org/r/20200904160004.87710-1-ivan.zaentsev@wirenboard.ru Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Replace zero-length array with flexible-arrayGustavo A. R. Silva2020-06-151-2/+2
| | | | | | | | | | | | There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://github.com/KSPP/linux/issues/21 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
* treewide: replace '---help---' in Kconfig files with 'help'Masahiro Yamada2020-06-141-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Since commit 84af7a6194e4 ("checkpatch: kconfig: prefer 'help' over '---help---'"), the number of '---help---' has been gradually decreasing, but there are still more than 2400 instances. This commit finishes the conversion. While I touched the lines, I also fixed the indentation. There are a variety of indentation styles found. a) 4 spaces + '---help---' b) 7 spaces + '---help---' c) 8 spaces + '---help---' d) 1 space + 1 tab + '---help---' e) 1 tab + '---help---' (correct indentation) f) 1 tab + 1 space + '---help---' g) 1 tab + 2 spaces + '---help---' In order to convert all of them to 1 tab + 'help', I ran the following commend: $ find . -name 'Kconfig*' | xargs sed -i 's/^[[:space:]]*---help---/\thelp/' Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
* w1: omap-hdq: print dev_err if irq flags are not clearedH. Nikolaus Schaller2020-05-271-0/+8
| | | | | | | | | | | | If irq flags are not cleared for certain operations we print an error message. Since this should never occur in normal operation, this patch is an optional safety-net and debugging tool. Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Link: https://lore.kernel.org/r/2de305d3046c7281a7123347899abbaa64c54fb8.1590255176.git.hns@goldelico.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: omap-hdq: fix interrupt handling which did show spurious timeoutsH. Nikolaus Schaller2020-05-271-20/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since commit 27d13da8782a ("w1: omap-hdq: Simplify driver with PM runtime autosuspend") was applied, I did see timeouts and wrong values when reading a bq27000 connected to hdq of the omap3. This occurred mainly after boot but remained and only sometimes settled down after several reads. root@letux:~# time cat /sys/class/power_supply/bq27000-battery/uevent POWER_SUPPLY_NAME=bq27000-battery POWER_SUPPLY_STATUS=Discharging POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_VOLTAGE_NOW=0 POWER_SUPPLY_CURRENT_NOW=0 POWER_SUPPLY_CAPACITY=0 POWER_SUPPLY_CAPACITY_LEVEL=Normal POWER_SUPPLY_TEMP=-2731 POWER_SUPPLY_TIME_TO_EMPTY_NOW=0 POWER_SUPPLY_TIME_TO_EMPTY_AVG=0 POWER_SUPPLY_TIME_TO_FULL_NOW=0 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_CHARGE_FULL=0 POWER_SUPPLY_CHARGE_NOW=0 POWER_SUPPLY_CHARGE_FULL_DESIGN=0 POWER_SUPPLY_CYCLE_COUNT=0 POWER_SUPPLY_ENERGY_NOW=0 POWER_SUPPLY_POWER_AVG=0 POWER_SUPPLY_HEALTH=Good POWER_SUPPLY_MANUFACTURER=Texas Instruments real    0m15.761s user    0m0.001s sys     0m0.025s root@letux:~# Sometimes the effect did disappear after accessing the device multiple times, speed went up and results became correct. All this indicates that some interrupts from the hdq controller are lost by the driver. Enabling debugging revealed that there were spurious tx and rx timeouts, i.e. the driver does not always recognise interrupts. The main problem is that rx and tx interrupts share a single variable which was sometimes reset to 0 wiping out other interrupts. And it was overwritten by a second interrupt, independent of whether the previous interrupt was already processed or not. This patch improves interrupt handling to avoid such races and loss of interrupt flags. The ideas are: * only the hdq_isr() sets bits in hdq_status * it does not reset any bits * it does wake_up() if any interrupt is pending * bits are only reset by the read/write/break functions if they were waited for * this makes sure that no interrupts can be lost * rx/tx/timeout bits are completely decoupled from each other (and not reset all after waiting for any of them) * which bits to reset is now specified by a new parameter to hdq_reset_irqstatus() * hdq_reset_irqstatus() also returns the state before resetting so that we can encapsulate the spinlock * this should now handle the case that the write and read are both already finished quickly before the hdq_write_byte() ends. * Or that two interrupts occur in succession before they are processed by the driver. Old code may have reset all status bits making the next hdq_read_byte() timeout. * the spinlock now always protects changing of bits in function hdq_reset_irqstatus() which could become a read-write-modify problem if the interrupt handler tries to read-modify-write exactly at the same moment * we add mutex protection also for hdq_write_byte() just to be safe to not to disturb a hdq_read_byte() triggered by some other thread/process. This patch was tested on a GTA04 and results in no boot problems any more. And first read after boot is now ok: root@letux:~# time cat /sys/class/power_supply/bq27000-battery/uevent POWER_SUPPLY_NAME=bq27000-battery POWER_SUPPLY_STATUS=Discharging POWER_SUPPLY_PRESENT=1 POWER_SUPPLY_VOLTAGE_NOW=3970000 POWER_SUPPLY_CURRENT_NOW=354144 POWER_SUPPLY_CAPACITY=82 POWER_SUPPLY_CAPACITY_LEVEL=Normal POWER_SUPPLY_TEMP=266 POWER_SUPPLY_TIME_TO_EMPTY_NOW=7680 POWER_SUPPLY_TIME_TO_EMPTY_AVG=7380 POWER_SUPPLY_TECHNOLOGY=Li-ion POWER_SUPPLY_CHARGE_FULL=934856 POWER_SUPPLY_CHARGE_NOW=763976 POWER_SUPPLY_CHARGE_FULL_DESIGN=1233792 POWER_SUPPLY_CYCLE_COUNT=82 POWER_SUPPLY_ENERGY_NOW=2852840 POWER_SUPPLY_POWER_AVG=1392840 POWER_SUPPLY_HEALTH=Good POWER_SUPPLY_MANUFACTURER=Texas Instruments real 0m0.233s user 0m0.000s sys 0m0.025s root@letux:~# It was also tested with dev_dbg enabled and more printk that all activities behave correctly, especially hdq_write_byte(), hdq_read_byte(), omap_hdq_break(). Not tested is omap_w1_triplet(). Fixes: 27d13da8782a ("w1: omap-hdq: Simplify driver with PM runtime autosuspend") Cc: stable@vger.kernel.org # v5.6+ Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Link: https://lore.kernel.org/r/68fc8623ae741878beef049273696d2377526165.1590255176.git.hns@goldelico.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: omap-hdq: fix return value to be -1 if there is a timeoutH. Nikolaus Schaller2020-05-271-1/+1
| | | | | | | | | | | | | | | | omap_w1_read_byte() should return -1 (or 0xff) in case of error (e.g. missing battery). The code accidentially overwrites the variable ret and not val, which is returned. So it will return the initial value 0 instead of -1. Fixes: 27d13da8782a ("w1: omap-hdq: Simplify driver with PM runtime autosuspend") Cc: stable@vger.kernel.org # v5.6+ Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Link: https://lore.kernel.org/r/b2c2192b461fbb9b8e9bea4ad514a49557a7210b.1590255176.git.hns@goldelico.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: omap-hdq: cleanup to add missing newline for some dev_dbgH. Nikolaus Schaller2020-05-271-5/+5
| | | | | | | | | | | Otherwise it will corrupt the console log during debugging. Fixes: 7b5362a603a1 ("w1: omap_hdq: Fix some error/debug handling.") Cc: stable@vger.kernel.org Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com> Link: https://lore.kernel.org/r/cd0d55749a091214106575f6e1d363c6db56622f.1590255176.git.hns@goldelico.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1_therm: remove redundant assignments to variable retColin Ian King2020-05-211-4/+4
| | | | | | | | | | | The variable ret is being initialized with a value that is never read and it is being updated later with a new value. The initialization is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/r/20200519154553.873413-1-colin.king@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1_therm: Free the correct variableDan Carpenter2020-05-211-2/+3
| | | | | | | | | | | The problem is that we change "p_args" to point to the middle of the string so when we free it at the end of the function it's not freeing the same pointer that we originally allocated. Fixes: e2c94d6f5720 ("w1_therm: adding alarm sysfs entry") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20200520120019.GA172354@mwanda Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1_therm: adding bulk read support to trigger multiple conversion on busAkira Shimahara2020-05-151-2/+249
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adding bulk read support: Sending a 'trigger' command in the dedicated sysfs entry of bus master device send a conversion command for all the slaves on the bus. The sysfs entry is added as soon as at least one device supporting this feature is detected on the bus. The behavior of the sysfs reading temperature on the device is as follow: * If no bulk read pending, trigger a conversion on the device, wait for the conversion to be done, read the temperature in device RAM * If a bulk read has been trigger, access directly the device RAM This behavior is the same on the 2 sysfs entries ('temperature' and 'w1_slave'). Reading the therm_bulk_read sysfs give the status of bulk operations: * '-1': conversion in progress on at least 1 sensor * '1': conversion complete but at least one sensor has not been read yet * '0': no bulk operation. Reading temperature on ecah device will trigger a conversion As not all devices support bulk read feature, it has been added in device family structure. The attribute is set at master level as soon as a supporting device is discover. It is removed when the last supported device leave the bus. The count of supported device is kept with the static counter bulk_read_device_counter. A strong pull up is apply on the line if at least one device required it. The duration of the pull up is the max time required by a device on the line, which depends on the resolution settings of each device. The strong pull up could be adjust with the a module parameter. Updating documentation in Documentation/ABI/testing/sysfs-driver-w1_therm and Documentation/w1/slaves/w1_therm.rst accordingly. Signed-off-by: Akira Shimahara <akira215corp@gmail.com> Link: https://lore.kernel.org/r/20200511203820.411483-1-akira215corp@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1_therm: adding alarm sysfs entryAkira Shimahara2020-05-151-0/+161
| | | | | | | | | | | | | | | | | | | | Adding device alarms settings by a dedicated sysfs entry alarms (RW): read or write TH and TL in the device RAM. Checking devices in alarm state could be performed using the master search command. As alarms temperature level are store in a 8 bit register on the device and are signed values, a safe cast shall be performed using the min and max temperature that device are able to measure. This is done by int_to_short inline function. A 'write_data' field is added in the device structure, to bind the correct writing function, as some devices may have 2 or 3 bytes RAM. Updating Documentation/ABI/testing/sysfs-driver-w1_therm accordingly. Signed-off-by: Akira Shimahara <akira215corp@gmail.com> Link: https://lore.kernel.org/r/20200511203801.411253-1-akira215corp@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1_therm: optimizing temperature read timingsAkira Shimahara2020-05-151-101/+185
| | | | | | | | | | | | | | | | | | | | | | | | | | Optimizing temperature reading by reducing waiting conversion time according to device resolution settings, as per device specification. This is device dependent as not all the devices supports resolution setting, so it has been added in device family structures. The process to read the temperature on the device has been adapted in a new function 'convert_t()', which replace the former 'read_therm()', is introduce to deal with this timing. Strong pull up is also applied during the required time, according to device power status needs and 'strong_pullup' module parameter. 'temperature_from_RAM()' function is introduced to get the correct temperature computation (device dependent) from device RAM data. An new sysfs entry has been added to ouptut only temperature. The old entry w1_slave has been kept for compatibility, without changing its output format. Updating Documentation/ABI/testing/sysfs-driver-w1_therm accordingly. Signed-off-by: Akira Shimahara <akira215corp@gmail.com> Link: https://lore.kernel.org/r/20200511203742.411039-1-akira215corp@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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