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path: root/drivers/spi/spi-bitbang.c
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2021-06-01spi: Cleanup on failure of initial setupLukas Wunner1-4/+14
Commit c7299fea6769 ("spi: Fix spi device unregister flow") changed the SPI core's behavior if the ->setup() hook returns an error upon adding an spi_device: Before, the ->cleanup() hook was invoked to free any allocations that were made by ->setup(). With the commit, that's no longer the case, so the ->setup() hook is expected to free the allocations itself. I've identified 5 drivers which depend on the old behavior and am fixing them up hereinafter: spi-bitbang.c spi-fsl-spi.c spi-omap-uwire.c spi-omap2-mcspi.c spi-pxa2xx.c Importantly, ->setup() is not only invoked on spi_device *addition*: It may subsequently be called to *change* SPI parameters. If changing these SPI parameters fails, freeing memory allocations would be wrong. That should only be done if the spi_device is finally destroyed. I am therefore using a bool "initial_setup" in 4 of the affected drivers to differentiate between the invocation on *adding* the spi_device and any subsequent invocations: spi-bitbang.c spi-fsl-spi.c spi-omap-uwire.c spi-omap2-mcspi.c In spi-pxa2xx.c, it seems the ->setup() hook can only fail on spi_device addition, not any subsequent calls. It therefore doesn't need the bool. It's worth noting that 5 other drivers already perform a cleanup if the ->setup() hook fails. Before c7299fea6769, they caused a double-free if ->setup() failed on spi_device addition. Since the commit, they're fine. These drivers are: spi-mpc512x-psc.c spi-pl022.c spi-s3c64xx.c spi-st-ssc4.c spi-tegra114.c (spi-pxa2xx.c also already performs a cleanup, but only in one of several error paths.) Fixes: c7299fea6769 ("spi: Fix spi device unregister flow") Signed-off-by: Lukas Wunner <lukas@wunner.de> Cc: Saravana Kannan <saravanak@google.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> # pxa2xx Link: https://lore.kernel.org/r/f76a0599469f265b69c371538794101fa37b5536.1622149321.git.lukas@wunner.de Signed-off-by: Mark Brown <broonie@kernel.org>
2021-03-24spi: spi-bitbang: Fix open brace following function definitions go on the ↵Jay Fang1-3/+6
next line Fix checkpatch errors: ERROR: open brace '{' following function definitions go on the next line #54: FILE: spi-bitbang.c:54: ERROR: open brace '{' following function definitions go on the next line #82: FILE: spi-bitbang.c:82: ERROR: open brace '{' following function definitions go on the next line #110: FILE: spi-bitbang.c:110: Signed-off-by: Jay Fang <f.fangjian@huawei.com> Link: https://lore.kernel.org/r/1616566602-13894-8-git-send-email-f.fangjian@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
2020-07-17spi: spi-bitbang: Demote obvious misuse of kerneldoc to standard comment blocksLee Jones1-3/+3
No attempt has been made to document any of the demoted functions here. Fixes the following W=1 kernel build warning(s): drivers/spi/spi-bitbang.c:181: warning: Function parameter or member 'spi' not described in 'spi_bitbang_setup' drivers/spi/spi-bitbang.c:215: warning: Function parameter or member 'spi' not described in 'spi_bitbang_cleanup' drivers/spi/spi-bitbang.c:434: warning: Function parameter or member 'bitbang' not described in 'spi_bitbang_stop' Signed-off-by: Lee Jones <lee.jones@linaro.org> Link: https://lore.kernel.org/r/20200717135424.2442271-3-lee.jones@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
2019-12-09spi: bitbang: Make chipselect callback optionalLinus Walleij1-2/+19
The ->chipselect() callback on the bit-banged SPI library master is optional if using GPIO descriptors: when using descriptors exclusively without any native chipselects, the core does not even call out the the native ->set_cs() and therefore ->chipselect() on a bit-banged SPI master will not even be called in this case. Make sure to respect the SPI_MASTER_GPIO_SS as used by e.g. spi-gpio.c though: this setting will make the core handle the chip select using GPIO descriptors *AND* call the local chipselect handler. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20191205091340.59850-1-linus.walleij@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
2019-06-10Merge tag 'spi-fix-v5.2-rc4' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi Pull spi fixes from Mark Brown: "A small set of fixes here. One core fix for error handling when we fail to set up the hardware before initiating a transfer and another one reverting a change in the core which broke Raspberry Pi in common use cases as part of some optimization work. There's also a couple of driver specific fixes" * tag 'spi-fix-v5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: spi: abort spi_sync if failed to prepare_transfer_hardware spi: spi-fsl-spi: call spi_finalize_current_message() at the end spi: bitbang: Fix NULL pointer dereference in spi_unregister_master spi: Fix Raspberry Pi breakage
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157Thomas Gleixner1-10/+1
Based on 3 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-16spi: bitbang: Fix NULL pointer dereference in spi_unregister_masterYueHaibing1-1/+1
If spi_register_master fails in spi_bitbang_start because device_add failure, We should return the error code other than 0, otherwise calling spi_bitbang_stop may trigger NULL pointer dereference like this: BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x45/0xd0 Read of size 8 at addr 0000000000000000 by task syz-executor.0/3661 CPU: 0 PID: 3661 Comm: syz-executor.0 Not tainted 5.1.0+ #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace: dump_stack+0xa9/0x10e ? __list_del_entry_valid+0x45/0xd0 ? __list_del_entry_valid+0x45/0xd0 __kasan_report+0x171/0x18d ? __list_del_entry_valid+0x45/0xd0 kasan_report+0xe/0x20 __list_del_entry_valid+0x45/0xd0 spi_unregister_controller+0x99/0x1b0 spi_lm70llp_attach+0x3ae/0x4b0 [spi_lm70llp] ? 0xffffffffc1128000 ? klist_next+0x131/0x1e0 ? driver_detach+0x40/0x40 [parport] port_check+0x3b/0x50 [parport] bus_for_each_dev+0x115/0x180 ? subsys_dev_iter_exit+0x20/0x20 __parport_register_driver+0x1f0/0x210 [parport] ? 0xffffffffc1150000 do_one_initcall+0xb9/0x3b5 ? perf_trace_initcall_level+0x270/0x270 ? kasan_unpoison_shadow+0x30/0x40 ? kasan_unpoison_shadow+0x30/0x40 do_init_module+0xe0/0x330 load_module+0x38eb/0x4270 ? module_frob_arch_sections+0x20/0x20 ? kernel_read_file+0x188/0x3f0 ? find_held_lock+0x6d/0xd0 ? fput_many+0x1a/0xe0 ? __do_sys_finit_module+0x162/0x190 __do_sys_finit_module+0x162/0x190 ? __ia32_sys_init_module+0x40/0x40 ? __mutex_unlock_slowpath+0xb4/0x3f0 ? wait_for_completion+0x240/0x240 ? vfs_write+0x160/0x2a0 ? lockdep_hardirqs_off+0xb5/0x100 ? mark_held_locks+0x1a/0x90 ? do_syscall_64+0x14/0x2a0 do_syscall_64+0x72/0x2a0 entry_SYSCALL_64_after_hwframe+0x49/0xbe Reported-by: Hulk Robot <hulkci@huawei.com> Fixes: 702a4879ec33 ("spi: bitbang: Let spi_bitbang_start() take a reference to master") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Axel Lin <axel.lin@ingics.com> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2019-04-08spi: bitbang: Introduce spi_bitbang_init()Andrey Smirnov1-27/+39
Move all of the code doing struct spi_bitbang initialization, so that it can be paired with devm_spi_register_master() in order to avoid having to call spi_bitbang_stop() explicitly. Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Cc: Mark Brown <broonie@kernel.org> Cc: Chris Healy <cphealy@gmail.com> Cc: linux-spi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
2019-01-17spi: bitbang: Don't call chipselect() in spi_bitbang_setup()Alban Bedel1-13/+0
spi_setup() already call spi_set_cs() right after calling the controller setup method, so there is no need for the bitbang driver to do that. Because of this the chipselect() callback was confusingly still called when CS is GPIO based. Signed-off-by: Alban Bedel <albeu@free.fr> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-08-01spi: spi-gpio: add SPI_3WIRE supportLorenzo Bianconi1-0/+16
Add SPI_3WIRE support to spi-gpio controller introducing set_line_direction function pointer in spi_bitbang data structure. Spi-gpio controller has been tested using hts221 temp/rh iio sensor running in 3wire mode and lsm6dsm running in 4wire mode Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2018-08-01spi: add flags parameter to txrx_word function pointersLorenzo Bianconi1-13/+21
Add the capability to specify the flag parameter used in bitbang_txrx_be_cpha{0,1} through the txrx_word function pointers of spi_bitbang data structure. That feature will be used to add spi-3wire support to the spi-gpio controller Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-10-05spi: bitbang: switch to the generic implementation of transfer_one_messageHeiner Kallweit1-89/+36
Change the bitbang driver to use the generic implementation of transfer_one_message. This simplifies the bitbang driver code and provides benefits like the statistics in the generic implementation. Successfully tested on a IMX6-based system (spi-imx) and on a MIPS-based router (OpenWRT with spi-ath79). Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-10-05spi: bitbang: remove unneeded checkHeiner Kallweit1-14/+4
Remove an unneeded check. The SPI core (__spi_validate) takes care that these fields are always populated. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-09-17spi: bitbang: Replace spinlock by mutexNicolas Boichat1-10/+7
chipselect (in the case of spi-gpio: spi_gpio_chipselect, which calls gpiod_set_raw_value_cansleep) can sleep, so we should not hold a spinlock while calling it from spi_bitbang_setup. This issue was introduced by this commit, which converted spi-gpio to cansleep variants: d9dda5a191 "spi: spi-gpio: Use 'cansleep' variants to access GPIO" Replacing the lock variable by a mutex fixes the issue: This is safe as all instances where the lock is used are called from contexts that can sleep. Finally, update spi-ppc4xx and and spi-s3c24xx to use mutex functions, as they directly hold the lock for similar purpose. Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2015-04-18spi: bitbang: Make setup_transfer() callback optionalPelle Nilsson1-7/+10
Some controller drivers have no need of this callback (spi-altera even causes a NULL pointer dereference because it doesn't register the callback, falsely assuming that it is already optional). Fixes: 30af9b558a56 ("spi/bitbang: Drop empty setup() functions") Signed-off-by: Pelle Nilsson <per.nilsson@xelmo.com> Reviewed-by: Ezequiel Garcia <ezequiel.garcia@vanguardiasur.com.ar> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-12-22spi: Remove FSF mailing addressesJarkko Nikula1-4/+0
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2014-03-30Merge remote-tracking branches 'spi/topic/imx', 'spi/topic/init', ↵Mark Brown1-1/+0
'spi/topic/mpc512x-psc', 'spi/topic/mpc52xx', 'spi/topic/mxs', 'spi/topic/nuc900', 'spi/topic/oc-tiny' and 'spi/topic/octeon' into spi-next
2014-03-29spi: bitbang: Make spi_bitbang_stop() return voidAxel Lin1-3/+1
spi_bitbang_stop() never fails, so make it return void. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2014-02-03spi: delete non-required instances of include <linux/init.h>Paul Gortmaker1-1/+0
None of these files are actually using any __init type directives and hence don't need to include <linux/init.h>. Most are just a left over from __devinit and __cpuinit removal, or simply due to code getting copied from one driver to the next. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-10-14spi: bitbang: Fix checkpatch issueJingoo Han1-6/+7
Fix the following checkpatch warnings WARNING: sizeof *cs should be sizeof(*cs) WARNING: please, no space before tabs WARNING: space prohibited between function name and open parenthesis '(' WARNING: line over 80 characters Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-10-07spi: bitbang: Let spi_bitbang_start() take a reference to masterAxel Lin1-1/+11
Many drivers that use bitbang library have a leak on probe error paths. This is because once a spi_master_get() call succeeds, we need an additional spi_master_put() call to free the memory. Fix this issue by moving the code taking a reference to master to spi_bitbang_start(), so spi_bitbang_start() will take a reference to master on success. With this change, the caller is responsible for calling spi_bitbang_stop() to decrement the reference and spi_master_put() as counterpart of spi_alloc_master() to prevent a memory leak. So now we have below patten for drivers using bitbang library: probe: spi_alloc_master -> Init reference count to 1 spi_bitbang_start -> Increment reference count remove: spi_bitbang_stop -> Decrement reference count spi_master_put -> Decrement reference count (reference count reaches 0) Fixup all users accordingly. Signed-off-by: Axel Lin <axel.lin@ingics.com> Suggested-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Acked-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-06Merge branch 'for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree from Jiri Kosina: "The usual trivial updates all over the tree -- mostly typo fixes and documentation updates" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (52 commits) doc: Documentation/cputopology.txt fix typo treewide: Convert retrun typos to return Fix comment typo for init_cma_reserved_pageblock Documentation/trace: Correcting and extending tracepoint documentation mm/hotplug: fix a typo in Documentation/memory-hotplug.txt power: Documentation: Update s2ram link doc: fix a typo in Documentation/00-INDEX Documentation/printk-formats.txt: No casts needed for u64/s64 doc: Fix typo "is is" in Documentations treewide: Fix printks with 0x%# zram: doc fixes Documentation/kmemcheck: update kmemcheck documentation doc: documentation/hwspinlock.txt fix typo PM / Hibernate: add section for resume options doc: filesystems : Fix typo in Documentations/filesystems scsi/megaraid fixed several typos in comments ppc: init_32: Fix error typo "CONFIG_START_KERNEL" treewide: Add __GFP_NOWARN to k.alloc calls with v.alloc fallbacks page_isolation: Fix a comment typo in test_pages_isolated() doc: fix a typo about irq affinity ...
2013-08-20spi/bitbang: trivial: fix doubled word "use"Uwe Kleine-König1-1/+1
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2013-08-15spi: bitbang: Remove unused tmp variableAxel Lin1-2/+0
Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-09spi/bitbang: don't error out if there is no setup callback providedUwe Kleine-König1-2/+1
It's perfectly valid not to have a setup callback when the probe routine does all the needed things. So don't even check for this case and trust the caller. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-17spi: spi-bitbang: Fix conversion of spi_bitbang_transfer_one()Fabio Estevam1-3/+4
Since commit 2025172e3 (spi/bitbang: Use core message pump), the following kernel crash is seen: Unable to handle kernel NULL pointer dereference at virtual address 0000000d pgd = 80004000 [0000000d] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 1 PID: 48 Comm: spi32766 Not tainted 3.11.0-rc1+ #4 task: bfa3e580 ti: bfb90000 task.ti: bfb90000 PC is at spi_bitbang_transfer_one+0x50/0x248 LR is at spi_bitbang_transfer_one+0x20/0x248 ... ,and also the following build warning: drivers/spi/spi-bitbang.c: In function 'spi_bitbang_start': drivers/spi/spi-bitbang.c:436:31: warning: assignment from incompatible pointer type [enabled by default] In order to fix it, we need to change the first parameter of spi_bitbang_transfer_one() to 'struct spi_master *master'. Tested on a mx6qsabrelite by succesfully probing a SPI NOR flash. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-17spi/bitbang: Use core message pumpMark Brown1-70/+30
Convert drivers using bitbang to use the core mesasge pump infrastructure, saving some code and meaning that these drivers get to take advantage of work done on improving the core implementation. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-15spi/bitbang: Factor out message transfer from message pump loopMark Brown1-95/+104
In order to make it easier to convert to transfer_one_message() lift the code that does the actual message transfer out of the work function that implements the message pump. This should have no functional impact, it's just a simple code motion patch. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-15spi/bitbang: Unexport spi_bitbang_transfer()Mark Brown1-2/+1
Currently no drivers use the ability to override spi_bitbang_transfer() and if any started this would make it harder to convert the bitbang code to use transfer_one_message() so remove the export in order to prevent anyone starting. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-02-05Merge branch 'broonie/spi-next' of ↵Grant Likely1-13/+14
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git Minor features and bug fixes for PXA, OMAP and GPIO deivce drivers and a cosmetic change to the bitbang driver. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2013-02-05spi: remove check for bits_per_word on transfer from low level driverLaxman Dewangan1-3/+3
The spi core make sure that each transfer structure have the proper setting for bits_per_word before calling low level transfer APIs. Hence it is no more require to check again in low level driver for this field whether this is set correct or not. Removing such code from low level driver. The txx9 change also removes a test for bits_per_word set to 0, and forcing it to 8 in that case. This can also be removed now since spi_setup() ensures spi->bits_per_word is not zero. if (!spi->bits_per_word) spi->bits_per_word = 8; Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2013-01-14spi: bitbang: simplify pointer arithmeticsGuennadi Liakhovetski1-13/+14
Add a pointer variable to make spi_bitbang_start() look simpler. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-11-14spi/bitbang: (cosmetic) simplify list manipulationGuennadi Liakhovetski1-5/+3
Use a proper list iterator instead of an open-coded loop and remove a superfluous list head initialisation. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2012-11-14spi/bitbang: avoid needless loop flow manipulationsGuennadi Liakhovetski1-11/+8
This patch makes a loop look cleaner by replacing a "break" and a "continue" in its body by a single "if". Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-10-31spi: Add module.h to implicit users in drivers/spiPaul Gortmaker1-0/+1
We are clipping down the presence of module.h, since it was everywhere. If you really need it, you better call it out, as per this changeset. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-06-06spi: reorganize driversGrant Likely1-0/+505
Sort the SPI makefile and enforce the naming convention spi_*.c for spi drivers. This change also rolls the contents of atmel_spi.h into the .c file since there is only one user of that particular include file. v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be be the predominant pattern for subsystem prefixes. - Clean up filenames in Kconfig and header comment blocks Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Linus Walleij <linus.walleij@linaro.org>
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