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commit 53f8d322234649b4d6f1515b20c127a577efd164 upstream.
gpiod_set_array_value_complex does not clear the bits field.
Therefore when the drivers set_multiple funciton is called bits outside
the mask are undefined and can be either set or not. So bank_val needs
to be masked with bank_mask before or with the reg_val cache.
Fixes: b4818afeacbd ("gpio: pca953x: Add set_multiple to allow multiple")
Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 386377b5473043c09b2de40bfe5abfb0fc87e1b4 upstream.
Need to ensure that reg_output is not updated while setting multiple
bits. This makes the mutex locking behaviour for the set_multiple call
consistent with that of the set_value call.
Fixes: b4818afeacbd ("gpio: pca953x: Add set_multiple to allow multiple")
Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 60f8339eb388df8a46f8eb4282ff0e15f08f218c upstream.
When locking a GPIO line as IRQ, we go to lengths to
double-check that the line is really set as input before
marking it as used for IRQ. This is not good on GPIO chips
that can sleep, because this function is called in IRQ-safe
context. Just skip this if it can't be checked quickly.
Currently this happens on sleeping expanders such as STMPE
or TC3589x:
BUG: scheduling while atomic: swapper/1/0x00000002
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.9.0-rc1+ #38
Hardware name: Nomadik STn8815
[<c000f2e0>] (unwind_backtrace) from [<c000d244>] (show_stack+0x10/0x14)
[<c000d244>] (show_stack) from [<c0037b78>] (__schedule_bug+0x54/0x80)
[<c0037b78>] (__schedule_bug) from [<c042df14>] (__schedule+0x3a0/0x460)
[<c042df14>] (__schedule) from [<c042e028>] (schedule+0x54/0xb8)
(...)
This patch fixes that problem and relies on the direction
read from the chip when it was added.
Fixes: 9c10280d85c1 ("gpio: flush direction status in gpiochip_lock_as_irq()")
Cc: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit c7e9d39831a31682285cc31ddf7dd06c0fe59138 upstream.
Sylvain Lemieux reports the LPC32xx GPIO driver is broken since
commit 762c2e46c059 ("gpio: of: remove of_gpiochip_and_xlate() and
struct gg_data"). Probably, gpio-etraxfs.c and gpio-davinci.c are
broken too.
Those drivers register multiple gpio_chip that are associated to a
single OF node, and their own .of_xlate() checks if the passed
gpio_chip is valid.
Now, the problem is of_find_gpiochip_by_node() returns the first
gpio_chip found to match the given node. So, .of_xlate() fails,
except for the first GPIO bank.
Reverting the commit could be a solution, but I do not want to go
back to the mess of struct gg_data. Another solution here is to
take the match by a node pointer and the success of .of_xlate().
It is a bit clumsy to call .of_xlate twice; for gpio_chip matching
and for really getting the gpio_desc index. Perhaps, our long-term
goal might be to convert the drivers to single chip registration,
but this commit will solve the problem until then.
Fixes: 762c2e46c059 ("gpio: of: remove of_gpiochip_and_xlate() and struct gg_data")
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reported-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
Tested-by: David Lechner <david@lechnology.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 812d47889a8e418d7bea9bec383581a34c19183e upstream.
This fixes the irq allocation in this driver to not print:
irq: Cannot allocate irq_descs @ IRQ34, assuming pre-allocated
irq: Cannot allocate irq_descs @ IRQ66, assuming pre-allocated
Which happens because the driver already called irq_alloc_descs()
and so the change to use irq_domain_add_simple resulted in calling
irq_alloc_descs() twice.
Modernize the irq allocation in this driver to use the
irq_domain_add_linear flow directly and eliminate the use of
irq_domain_add_simple/legacy
Fixes: ce931f571b6d ("gpio/mvebu: convert to use irq_domain_add_simple()")
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 953b956a2e6d35298e684f251bad98ea6c96f982 upstream.
When allocating a new line handle or event a file is allocated that it is
associated to. The file is attached to a file descriptor of the current
process and the file descriptor is returned to userspace using
copy_to_user(). If this copy operation fails the line handle or event
allocation is aborted, all acquired resources are freed and an error is
returned.
But the file struct is not freed and left attached to the userspace
application and even though the file descriptor number was not copied it is
trivial to guess. If a userspace application performs a IOCTL on such a
left over file descriptor it will trigger a use-after-free and if the file
descriptor is closed (latest when the application exits) a double-free is
triggered.
anon_inode_getfd() performs 3 tasks, allocate a file struct, allocate a
file descriptor for the current process and install the file struct in the
file descriptor. As soon as the file struct is installed in the file
descriptor it is accessible by userspace (even if the IOCTL itself hasn't
completed yet), this means uninstalling the fd on the error path is not an
option, since userspace might already got a reference to the file.
Instead anon_inode_getfd() needs to be broken into its individual steps.
The allocation of the file struct and file descriptor is done first, then
the copy_to_user() is executed and only if it succeeds the file is
installed.
Since the file struct is reference counted it can not be just freed, but
its reference needs to be dropped, which will also call the release()
callback, which will free the state attached to the file. So in this case
the normal error cleanup path should not be taken.
Fixes: d932cd49182f ("gpio: free handles in fringe cases")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit d82aa4a8f2e8df9673ddb099262355da4c9b99b1 upstream.
The GPIOHANDLE_GET_LINE_VALUES_IOCTL handler allocates a gpiohandle_data
struct on the stack and then passes it to copy_to_user(). But only the
first element of the values array in the struct is set, which leaves the
struct partially initialized.
This exposes the previous, potentially sensitive, stack content to the
issuing userspace application. To avoid this make sure that the struct is
fully initialized.
Cc: stable@vger.kernel.org
Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit ac7dbb991ee5afc0beacce3a252dcaaa249a7786 upstream.
The GPIO_GET_LINEEVENT_IOCTL currently ignores unknown or undefined
linehandle and lineevent flags. From a backwards and forwards compatibility
viewpoint it is highly desirable to reject unknown flags though.
On one hand an application that is using newer flags and is running on
an older kernel has no way to detect if the new flags were handled
correctly if they are silently discarded.
On the other hand an application that (accidentally) passes undefined flags
will run fine on an older kernel, but may break on a newer kernel when
these flags get defined.
Ensure that requests that have undefined flags set are rejected with an
error, rather than silently discarding the undefined flags.
Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit e3e847c7f15a27c80f526b2a7a8d4dd7ce0960a0 upstream.
The GPIO_GET_LINEHANDLE_IOCTL currently ignores unknown or undefined
linehandle flags. From a backwards and forwards compatibility viewpoint it
is highly desirable to reject unknown flags though.
On one hand an application that is using newer flags and is running on
an older kernel has no way to detect if the new flags were handled
correctly if they are silently discarded.
On the other hand an application that (accidentally) passes undefined flags
will run fine on an older kernel, but may break on a newer kernel when
these flags get defined.
Ensure that requests that have undefined flags set are rejected with an
error, rather than silently discarding the undefined flags.
Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit b8b0e3d303654b3bb7b31b0266c513fd6f4132ce upstream.
The line offset that is used as an index into the descs array is provided
by userspace and might go beyond the bounds of the array. If that happens
undefined behavior will occur.
Make sure that the offset is within the bounds of the desc array and reject
any requests that specify a value outside of it.
Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 3eded5d83bf4e36ad78775c7ceb44a45480b0abd upstream.
The GPIOHANDLE_GET_LINE_VALUES_IOCTL handler allocates a gpiohandle_data
struct on the stack and then passes it to copy_to_user(). But depending on
the number of requested line handles the struct is only partially
initialized.
This exposes the previous, potentially sensitive, stack content to the
issuing userspace application. To avoid this make sure that the struct is
fully initialized.
Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit e405f9fcb63602d35f7a419ededa3f952a395a72 upstream.
The line offset that is used as an index into the descs array is provided
by userspace and might go beyond the bounds of the array. If that happens
undefined behavior will occur.
Make sure that the offset is within the bounds of the desc array and reject
any requests that specify a value outside of it.
Fixes: d7c51b47ac11 ("gpio: userspace ABI for reading/writing GPIO lines")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 0f4bbb233743bdfd51d47688b0bc2561f310488b upstream.
The GPIO_GET_CHIPINFO_IOCTL handler allocates a gpiochip_info struct on the
stack and then passes it to copy_to_user(). But depending on the length of
the GPIO chip name and label the struct is only partially initialized.
This exposes the previous, potentially sensitive, stack content to the
issuing userspace application. To avoid this make sure that the struct is
fully initialized.
Fixes: 521a2ad6f862 ("gpio: add userspace ABI for GPIO line information")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 1f1cc4566bd9dd8d3cf19965a4b6392143618536 upstream.
The current line offset validation is off by one. Depending on the data
stored behind the descs array this can either cause undefined behavior or
disclose arbitrary, potentially sensitive, memory to the issuing userspace
application.
Make sure that offset is within the bounds of the desc array.
Fixes: 521a2ad6f862 ("gpio: add userspace ABI for GPIO line information")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit 67bf5156edc4f58241fd7c119ae145c552adddd6 upstream.
acpi_dev_gpio_irq_get() currently ignores the error returned
by acpi_get_gpiod_by_index() and overwrites it with -ENOENT.
Problem is this error can be -EPROBE_DEFER, which just blows
up some drivers when the module ordering is not correct.
Signed-off-by: David Arcari <darcari@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit d71cf15b865bdd45925f7b094d169aaabd705145 upstream.
From the beginning of the gpio-mpc8xxx.c, the "handle_level_irq"
has being used to handle GPIO interrupts in the PowerPC/Layerscape
platforms. But actually, almost all PowerPC/Layerscape platforms
assert an interrupt request upon either a high-to-low change or
any change on the state of the signal.
So the "handle_level_irq" is not reasonable for PowerPC/Layerscape
GPIO interrupt, it should be "handle_edge_irq". Otherwise the system
may lost some interrupts from the PIN's state changes.
Signed-off-by: Liu Gang <Gang.Liu@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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ucb1x00 has used IRQ probing since it's dawn to find the GPIO interrupt
that it's connected to. However, commit 23393d49fb75 ("gpio: kill off
set_irq_flags usage") broke this by disabling IRQ probing on GPIO
interrupts. Fix this.
Fixes: 23393d49fb75 ("gpio: kill off set_irq_flags usage")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The MCP23S08 driver certainly accesses fields inside the
struct gpio_chip that are only available under CONFIG_OF_GPIO
not just CONFIG_OF, so update the Kconfig and driver to reflect
this.
Cc: Alexander Stein <alexander.stein@systec-electronic.com>
Cc: Phil Reid <preid@electromag.com.au>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This reverts commit 7d4defe21c682c934a19fce1ba8b54b7bde61b08.
The commit was pointless, manically trembling in the dark for
a solution. The real fixes are:
commit 048c28c91e56
("gpio: make any OF dependent driver depend on OF_GPIO")
commit 2527ecc9195e
("gpio: Fix OF build problem on UM")
Reported-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The drivers that depend on OF but not OF_GPIO are wreaking havoc
with the autobuilders for archs that have all requirements for
OF but not for OF_GPIO, particularly the UM (Usermode) arch does
not have iomem (NO_IOMEM) which result in configuring GPIOLIB but
without OF_GPIO which is wrong if the driver is using the .of_node
of the gpiochip, which only appears with OF_GPIO.
After a brief look at the drivers just depending on OF it seems
most if not all of them actually require stuff from gpiolib-of so
the dependency is wrong in the first place.
This simply patches the Kconfig so that all GPIO drivers using OF
depend on OF_GPIO rather than just OF.
Cc: Rabin Vincent <rabin@rab.in>
Cc: Pramod Gurav <pramod.gurav@smartplayin.com>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: Gregory CLEMENT <gregory.clement@free-electrons.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Alexandre Courbot <acourbot@nvidia.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The UserMode (UM) Linux build was failing in gpiolib-of as it requires
ioremap()/iounmap() to exist, which is absent from UM. The non-existence
of IO memory is negatively defined as CONFIG_NO_IOMEM which means we
need to depend on HAS_IOMEM.
Cc: stable@vger.kernel.org
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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gpiochip_add_data() has to be called before calling
max7301_direction_input()
[ 4.389883] Unable to handle kernel paging request for data at address 0x00000018
[ 4.397282] Faulting instruction address: 0xc01a8cbc
[ 4.402023] Oops: Kernel access of bad area, sig: 11 [#1]
[ 4.407331] PREEMPT CMPC885
[ 4.410131] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 4.5.0-gacdfdee #39
[ 4.418592] Workqueue: deferwq deferred_probe_work_func
[ 4.423711] task: c60798b0 ti: c608a000 task.ti: c608a000
[ 4.429038] NIP: c01a8cbc LR: c01a8e24 CTR: c01ff028
[ 4.433953] REGS: c608bad0 TRAP: 0300 Not tainted (4.5.0-s3k-dev-gacdfdee-svn-dirty)
[ 4.441847] MSR: 00009032 <EE,ME,IR,DR,RI> CR: 33039553 XER: a000f940
[ 4.448395] DAR: 00000018 DSISR: c0000000
GPR00: c01a8e24 c608bb80 c60798b0 c60d6f6c 00000004 00000002 07de2900 00700000
GPR08: 00000000 00000000 c608a000 00001032 35039553 00000000 c002f37c c6010b64
GPR16: c6010a48 c6010a14 c6010a00 00000000 c0450000 c0453568 c0453438 c050db14
GPR24: c62662bc 00000009 ffffffaa c60d6f5d 00000001 00000000 00000000 00000000
[ 4.480371] NIP [c01a8cbc] max7301_direction_input+0x20/0x9c
[ 4.485951] LR [c01a8e24] __max730x_probe+0xec/0x138
[ 4.490812] Call Trace:
[ 4.493268] [c608bba0] [c01a8e24] __max730x_probe+0xec/0x138
[ 4.498878] [c608bbc0] [c01cc368] driver_probe_device+0x190/0x38c
[ 4.504895] [c608bbf0] [c01ca918] bus_for_each_drv+0x58/0xb4
[ 4.510489] [c608bc20] [c01cc04c] __device_attach+0x8c/0x110
[ 4.516082] [c608bc50] [c01cab80] bus_probe_device+0x34/0xb8
[ 4.521673] [c608bc70] [c01c96c8] device_add+0x3c0/0x598
[ 4.526925] [c608bcb0] [c0200f90] spi_add_device+0x114/0x160
[ 4.532512] [c608bcd0] [c02018d0] spi_register_master+0x6e0/0x7c8
[ 4.538537] [c608bd20] [c02019fc] devm_spi_register_master+0x44/0x8c
[ 4.544824] [c608bd40] [c0203854] of_fsl_spi_probe+0x458/0x57c
[ 4.550587] [c608bda0] [c01cd828] platform_drv_probe+0x30/0x74
[ 4.556366] [c608bdb0] [c01cc368] driver_probe_device+0x190/0x38c
[ 4.562383] [c608bde0] [c01ca918] bus_for_each_drv+0x58/0xb4
[ 4.567977] [c608be10] [c01cc04c] __device_attach+0x8c/0x110
[ 4.573572] [c608be40] [c01cab80] bus_probe_device+0x34/0xb8
[ 4.579170] [c608be60] [c01cb9b4] deferred_probe_work_func+0xa4/0xc4
[ 4.585438] [c608be80] [c0029c04] process_one_work+0x22c/0x414
[ 4.591201] [c608bea0] [c002a100] worker_thread+0x314/0x5c0
[ 4.596722] [c608bef0] [c002f444] kthread+0xc8/0xcc
[ 4.601538] [c608bf40] [c000af84] ret_from_kernel_thread+0x5c/0x64
[ 4.607596] Instruction dump:
[ 4.610530] 7c0803a6 bba10014 38210020 4e800020 7c0802a6 9421ffe0 38840004 bf810010
[ 4.618188] 90010024 549cf0be 83c30010 549d0f7c <813e0018> 7fc3f378 7d3f2430 57ff07fe
[ 4.626041] ---[ end trace 303adb021dd4caf2 ]---
Cc: stable@vger.kernel.org
fixes: 5e45e01916197 ("gpio: max730x: use gpiochip data pointer")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
Pull GPIO updates from Linus Walleij:
"This is the bulk of GPIO changes for the v4.8 kernel cycle. The big
news is the completion of the chardev ABI which I'm very happy about
and apart from that it's an ordinary, quite busy cycle. The details
are below.
The patches are tested in linux-next for some time, patches to other
subsystem mostly have ACKs.
I got overly ambitious with configureing lines as input for IRQ lines
but it turns out that some controllers have their interrupt-enable and
input-enabling in orthogonal settings so the assumption that all IRQ
lines are input lines does not hold. Oh well, revert and back to the
drawing board with that.
Core changes:
- The big item is of course the completion of the character device
ABI. It has now replaced and surpassed the former unmaintainable
sysfs ABI: we can now hammer (bitbang) individual lines or sets of
lines and read individual lines or sets of lines from userspace,
and we can also register to listen to GPIO events from userspace.
As a tie-in we have two new tools in tools/gpio: gpio-hammer and
gpio-event-mon that illustrate the proper use of the new ABI. As
someone said: the wild west days of GPIO are now over.
- Continued to remove the pointless ARCH_[WANT_OPTIONAL|REQUIRE]_GPIOLIB
Kconfig symbols. I'm patching hexagon, openrisc, powerpc, sh,
unicore, ia64 and microblaze. These are either ACKed by their
maintainers or patched anyways after a grace period and no response
from maintainers.
Some archs (ARM) come in from their trees, and others (x86) are
still not fixed, so I might send a second pull request to root it
out later in this merge window, or just defer to v4.9.
- The GPIO tools are moved to the tools build system.
New drivers:
- New driver for the MAX77620/MAX20024.
- New driver for the Intel Merrifield.
- Enabled PCA953x for the TI PCA9536.
- Enabled PCA953x for the Intel Edison.
- Enabled R8A7792 in the RCAR driver.
Driver improvements:
- The STMPE and F7188x now supports the .get_direction() callback.
- The Xilinx driver supports setting multiple lines at once.
- ACPI support for the Vulcan GPIO controller.
- The MMIO GPIO driver supports device tree probing.
- The Acer One 10 is supported through the _DEP ACPI attribute.
Cleanups:
- A major cleanup of the OF/DT support code. It is way easier to
read and understand now, probably this improves performance too.
- Drop a few redundant .owner assignments.
- Remove CLPS711x boardfile support: we are 100% DT"
* tag 'gpio-v4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (67 commits)
MAINTAINERS: Add INTEL MERRIFIELD GPIO entry
gpio: dwapb: add missing fwnode_handle_put() in dwapb_gpio_get_pdata()
gpio: merrifield: Protect irq_ack() and gpio_set() by lock
gpio: merrifield: Introduce GPIO driver to support Merrifield
gpio: intel-mid: Make it depend to X86_INTEL_MID
gpio: intel-mid: Sort header block alphabetically
gpio: intel-mid: Remove potentially harmful code
gpio: rcar: add R8A7792 support
gpiolib: remove duplicated include from gpiolib.c
Revert "gpio: convince line to become input in irq helper"
gpiolib: of_find_gpio(): Don't discard errors
gpio: of: Allow overriding the device node
gpio: free handles in fringe cases
gpio: tps65218: Add platform_device_id table
gpio: max77620: get gpio value based on direction
gpio: lynxpoint: avoid potential warning on error path
tools/gpio: add install section
tools/gpio: move to tools buildsystem
gpio: intel-mid: switch to devm_gpiochip_add_data()
gpio: 74x164: Use spi_write() helper instead of open coding
...
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fwnode_handle_put() should be used when terminating
device_for_each_child_node() iteration with break or
return to prevent stale device node references from
being left behind.
Generated by Coccinelle.
Fixes: 4ba8cfa79f44 ("gpio: dwapb: convert device node to fwnode")
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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There is a potential race when two threads do the writes to the same register
in parallel.
Prevent out of order in such case by protecting I/O access by spin lock.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Intel Merrifield platform has a special GPIO controller to
drive pads when they are muxed in corresponding mode.
Intel Merrifield GPIO IP is slightly different here and there
in comparison to the older Intel MID platforms. These differences
include in particular the shaked register offsets, specific
support of level triggered interrupts and wake capable sources,
as well as a pinctrl which is a separate IP.
Instead of uglifying existing driver I decide to provide a new
one slightly based on gpio-intel-mid.c. So, anyone can easily
compare what changes are happened to be here.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Brian J Wood <brian.j.wood@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This GPIO controller is a part of Intel MID platforms which are somehow
different to pure PCs. Thus, there is no need that driver is compiled for them.
Replace dependency to X86_INTEL_MID.
While here, fix capitalization of MID abbreviation.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Sort the header inclusion lines by alphabetical order.
While here, update Intel Copyright.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The commit d56d6b3d7d69 ("gpio: langwell: add Intel Merrifield support")
doesn't look at all as a proper support for Intel Merrifield and I dare to say
that it distorts the behaviour of the hardware.
The register map is different on Intel Merrifield, i.e. only 6 out of 8
register have the same purpose but none of them has same location in the
address space. The current case potentially harmful to existing hardware since
it's poking registers on wrong offsets and may set some pin to be GPIO output
when connected hardware doesn't expect such.
Besides the above GPIO and pinctrl on Intel Merrifield have been located in
different IP blocks. The functionality has been extended as well, i.e. added
support of level interrupts, special registers for wake capable sources and
thus, in my opinion, requires a completele separate driver.
If someone wondering the existing gpio-intel-mid.c would be converted to actual
pinctrl (which by the fact it is now), though I wouldn't be a volunteer to do
that.
Fixes: d56d6b3d7d69 ("gpio: langwell: add Intel Merrifield support")
Cc: stable@vger.kernel.org # v3.13+
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Renesas R8A7792 SoC is a member of the R-Car gen2 family, add support for
its GPIO controllers.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Remove duplicated include.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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I stumbled over a build error with COMPILE_TEST and CONFIG_OF
disabled:
drivers/gpio/gpio-tegra.c: In function 'tegra_gpio_probe':
drivers/gpio/gpio-tegra.c:603:9: error: 'struct gpio_chip' has no member named 'of_node'
The problem is that the newly added GPIO_TEGRA Kconfig symbol
does not have a dependency on CONFIG_OF. However, there is another
problem here as the driver gets enabled unconditionally whenever
COMPILE_TEST is set.
This fixes both problems, by making the symbol user-visible
when COMPILE_TEST is set and default-enabled for ARCH_TEGRA=y.
As a side-effect, it is now possible to compile-test a Tegra
kernel with GPIO support disabled, which is harmless.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 4dd4dd1d2120 ("gpio: tegra: Allow compile test")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This reverts commit 7e7c059cb50c7c72d5a393b2c34fc57de1b01b55.
I was wrong about trying to do this, as it breaks the
orthogonality between gpiochips and irqchips.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Since commit dd34c37aa3e8 ("gpio: of: Allow -gpio suffix for property
names") when requesting a GPIO from the devicetree gpiolib looks for
properties with both the '-gpio' and the '-gpios' suffix. This was
implemented by first searching for the property with the '-gpios' suffix
and if that yields an error try the '-gpio' suffix. This approach has the
issue that any error returned when looking for the '-gpios' suffix is
silently discarded.
Commit 06fc3b70f1dc ("gpio: of: Fix handling for deferred probe for -gpio
suffix") partially addressed the issue by treating the EPROBE_DEFER error
as a special condition. This fixed the case when the property is specified,
but the GPIO provider is not ready yet. But there are other cases in which
of_get_named_gpiod_flags() returns an error even though the property is
specified, e.g. if the specification is incorrect.
of_find_gpio() should only try to look for the property with the '-gpio'
suffix if no property with the '-gpios' suffix was found. If the property
was not found of_get_named_gpiod_flags() will return -ENOENT, so update the
condition to abort and propagate the error to the caller in all other
cases.
This is important for gpiod_get_optinal() and friends to behave correctly
in case the specifier contains errors. Without this patch they'll return
NULL if the property uses the '-gpios' suffix and the specifier contains
errors, which falsely indicates to the caller that no GPIO was specified.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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When registering a GPIO chip, drivers can override the device tree node
associated with the chip by setting the chip's ->of_node field. If set,
this field is supposed to take precedence over the ->parent->of_node
field, but the code doesn't actually do that.
Commit 762c2e46c059 ("gpio: of: remove of_gpiochip_and_xlate() and
struct gg_data") exposes this because it now no longer matches on the
GPIO chip's ->of_node field, but the GPIO device's ->of_node field that
is set using the procedure described above.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This reverts commit 1e4a80640338924b9f9fd7a121ac31d08134410a.
This creates more problems than it solves right now. Compile
testing needs to go in with patches fixing the problems it
uncovers.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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If we fail when copying the ioctl() struct to userspace we still
need to clean up the cruft otherwise left behind or it will stay
around until the issuing process terminates the file handle.
Reported-by: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This reverts commit 923b93e451db876d1479d3e4458fce14fec31d1c.
Make sure consumers do not overwrite gpio flags for pins that have
already been claimed.
While adding support for gpio drivers to refuse a request using
unsupported flags, the order of when the requested flag was checked and
the new flags were applied was reversed to that consumers could
overwrite flags for already requested gpios.
This not only affects device-tree setups where two drivers could request
the same gpio using conflicting configurations, but also allowed user
space to clear gpio flags for already claimed pins simply by attempting
to export them through the sysfs interface. By for example clearing the
FLAG_ACTIVE_LOW flag this way, user space could effectively change the
polarity of a signal.
Reverting this change obviously prevents gpio drivers from doing sanity
checks on the flags in their request callbacks. Fortunately only one
recently added driver (gpio-tps65218 in v4.6) appears to do this, and a
follow up patch could restore this functionality through a different
interface.
Cc: stable <stable@vger.kernel.org> # 4.4
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This fixes the issue descirbe in bug 117531
(https://bugzilla.kernel.org/show_bug.cgi?id=117531).
It's a regression introduced in linux 4.5 that causes a Oops at load of
gpio_sch and prevents powering off the computer.
The issue is that sch_gpio_reg_set is called in sch_gpio_probe before
gpio_chip data is initialized with the pointer to the sch_gpio struct. As
sch_gpio_reg_set calls gpiochip_get_data, it returns NULL which causes
the Oops.
The patch follows Mika's advice (https://lkml.org/lkml/2016/5/9/61) and
consists in modifying sch_gpio_reg_get and sch_gpio_reg_set to take a
sch_gpio struct directly instead of a gpio_chip, which avoids the call to
gpiochip_get_data.
Thanks Mika for your patience with me :-)
Cc: stable@vger.kernel.org
Signed-off-by: Colin Pitrat <colin.pitrat@gmail.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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platform_device_id table is needed for adding the tps65218-gpio
module to the mfd_cell array.
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Gpio direction is determined by DIRx bit of GPIO
configuration register, return max77620 gpio value
based on direction in or out.
Signed-off-by: Venkat Reddy Talla <vreddytalla@nvidia.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
Pull pin control fixes from Linus Walleij:
"Here are a bunch of fixes for pin control. Just drivers and a
MAINTAINERS fixup:
- Driver fixes for i.MX, single register, Tegra and BayTrail.
- MAINTAINERS entry for the documentation"
* tag 'pinctrl-v4.7-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: baytrail: Fix mingled clock pins
MAINTAINERS: belong Documentation/pinctrl.txt properly
pinctrl: tegra: Fix build dependency
gpio: tegra: Make lockdep class file-scoped
pinctrl: single: Fix missing flush of posted write for a wakeirq
pinctrl: imx: Do not treat a PIN without MUX register as an error
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When devres API is in use we are not supposed to call plain gpiochip_remove().
Remove redundant call to gpiochip_remove().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The error handling is not correct since the commit 3f7dbfd8eea9 ("gpio:
intel-mid: switch to using gpiolib irqchip helpers"). Switch to devres API to
fix the potential resource leak.
Fixes: commit 3f7dbfd8eea9 ("gpio: intel-mid: switch to using gpiolib irqchip helpers")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The conversion from a DT spec to struct gpio_desc is common between
of_get_named_gpiod_flags() and of_parse_own_gpio(). Factor out the
common code to a new helper, of_xlate_and_get_gpiod_flags().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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The usage of gpiochip_find(&gg_data, of_gpiochip_and_xlate) is odd.
Usually gpiochip_find() is used to find a gpio_chip. Here, however,
the return value from gpiochip_find() is just discarded. Instead,
gpiochip_find(&gg_data, of_gpiochip_and_xlate) is called for the
side-effect of the match function.
The match function, of_gpiochip_find_and_xlate(), fills the given
struct gg_data, but a match function should be simply called to
judge the matching.
This commit fixes this distortion and makes the code more readable.
Remove of_gpiochip_find_and_xlate() and struct gg_data. Instead,
this adds a very simple helper function of_find_gpiochip_by_node().
Now, of_get_named_gpiod_flags() is implemented more straight-forward.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Do this sanity check only once when the gpio_chip is added
rather than every time gpio-hog is handled.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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This function is doing more complicated than needed. The caller of
this function, of_gpiochip_scan_gpios() already knows the pointer to
the gpio_chip. It can pass it to of_parse_own_gpio() instead of
looking up the gpio_chip by gpiochip_find().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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Call of_property_read_u32_array() only once rather than iterating
of_property_read_u32_index().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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