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* w1: Constify static w1_family_ops structsRikard Falkeborn2020-10-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Merge 5.2-rc6 into char-misc-nextGreg Kroah-Hartman2019-06-231-3/+1
|\ | | | | | | | | | | We need the char-misc fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230Thomas Gleixner2019-06-191-3/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Based on 2 normalized pattern(s): this source code is licensed under the gnu general public license version 2 see the file copying for more details this source code is licensed under general public license version 2 see extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 52 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | w1: ds2413: fix state byte comparisionMariusz Bialonczyk2019-06-061-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | This commit is fixing a smatch warning: drivers/w1/slaves/w1_ds2413.c:61 state_read() warn: impossible condition '(*buf == 255) => ((-128)-127 == 255)' by creating additional u8 variable for the bus reading and comparision Reported-by: kbuild test robot <lkp@intel.com> Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Fixes: 3856032a0628 ("w1: ds2413: when the slave is not responding during read, select it again") Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | w1: ds2413: when the slave is not responding during read, select it againMariusz Bialonczyk2019-05-241-1/+8
| | | | | | | | | | | | | | | | | | | | | | | | The protocol is not allowing to obtain a byte of 0xff for PIO_ACCESS_READ call. It is very likely that the slave was not addressed properly and it is just not respoding (leaving the bus in logic high state) during the read of sampled PIO value. We cannot just call w1_reset_resume_command() because the problem will persist, instead try selecting (addressing) the slave again. Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | w1: ds2413: add retry support to state_read()Mariusz Bialonczyk2019-05-241-13/+24
| | | | | | | | | | | | | | | | | | | | The state_read() was calling PIO_ACCESS_READ once and bail out if it failed for this first time. This commit is improving this to trying more times before it give up, similarly as the write call is currently doing. Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* | w1: ds2413: output_write() cosmetic fixes / simplifyMariusz Bialonczyk2019-05-241-8/+11
|/ | | | | | | | | Make the output_write simpler. Based on Jean-Francois Dagenais code from: 49695ac46861 ("w1: ds2408: reset on output_write retry with readback") Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Add subsystem kernel public interfaceAndrew F. Davis2017-06-091-3/+3
| | | | | | | | | | | | | | | | | | | | Like other subsystems we should be able to define slave devices outside of the w1 directory. To do this we move public facing interface definitions to include/linux/w1.h and rename the internal definition file to w1_internal.h. As w1_family.h and w1_int.h contained almost entirely public driver interface definitions we simply removed these files and moved the remaining definitions into w1_internal.h. With this we can now start to move slave devices out of w1/slaves and into the subsystem based on the function they implement, again like other drivers. Signed-off-by: Andrew F. Davis <afd@ti.com> Reviewed-by: Sebastian Reichel <sre@kernel.org> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: Organize driver source to natural/common orderAndrew F. Davis2017-05-251-5/+5
| | | | | | | | | | | | | | | Structures and functions should be ordered such that forward declaration use is minimized. MODULE_* macros should immediately follow the structures and functions upon which they act. Remaining MODULE_* macros should be at the end of the file in alphabetical order. Signed-off-by: Andrew F. Davis <afd@ti.com> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: add helper macro module_w1_familyAndrew F. Davis2016-08-021-13/+1
| | | | | | | | | | | | | The helper macro module_w1_family can be used in module drivers that only register a w1 driver in their module init functions. Add this macro and use it in all applicable drivers. Link: http://lkml.kernel.org/r/20160531204313.20979-2-afd@ti.com Signed-off-by: Andrew F. Davis <afd@ti.com> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* w1: slaves: w1_ds2413.c: convert to use w1_family_ops.groupsGreg Kroah-Hartman2013-08-221-50/+22
| | | | | | | | | | | This moves the sysfs file creation/removal to the w1 core by using the .groups field, saving code in the slave driver. Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de> Cc: Mariusz Bialonczyk <manio@skyboo.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: add family based automatic module loadingAlexander Stein2013-06-031-0/+1
| | | | | | | | | This patch allows the 1-wire bus to autoload the corresponding module for each slave being attached. This works similar to bluetooth protocols. Signed-off-by: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* w1: add support for DS2413 Dual Channel Addressable SwitchMariusz Bialonczyk2013-02-271-0/+177
Also fixes some whitespace inconsistency in Kconfig and w1_family.h when DS2408 chip support was added. Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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