ion_handle was introduced as an abstraction to represent a reference to
a buffer via an ion_client. As frameworks outside of Ion evolved, the dmabuf
emerged as the preferred standard for use in the kernel. This has made
the ion_handle an unnecessary abstraction and prone to race
conditions. ion_client is also now only used internally. We have enough
mechanisms for race conditions and leaks already so just drop ion_handle
and ion_client. This also includes ripping out most of the debugfs
infrastructure since much of that was tied to clients and handles.
The debugfs infrastructure was prone to give confusing data (orphaned
allocations) so it can be replaced with something better if people
actually want it.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Nobody uses this interface externally. Drop it.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The current model of Ion heap registration is based on the outdated
model of board files. The replacement for board files (devicetree)
isn't a good replacement for what Ion wants to do. In actuality, Ion
wants to show what memory is available in the system for something else
to figure out what to use. Switch to a model where Ion creates its
device unconditionally and heaps are registed as available regions.
Currently, only system and CMA heaps are converted over to the new
model. Carveout and chunk heaps can be converted over when someone wants
to figure out how.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Ion current has ion_priv.h and ion.h as header files. ion.h was intended
to be used for public APIs but Ion never ended up really having anything
public. Combine the two headers so there is only one internal header.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Once upon a time, phys_addr_t was not everywhere in the kernel. These
days it is used enough places that having a separate Ion type doesn't
make sense. Remove the extra type and just use phys_addr_t directly.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Several of the Ion ioctls were designed in such a way that they
necessitate compat ioctls. We're breaking a bunch of other ABIs and
cleaning stuff up anyway so let's follow the ioctl guidelines and clean
things up while everyone is busy converting things over anyway. As part
of this, also remove the useless alignment field from the allocation
structure.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Now that we have proper caching, stop setting the DMA address manually.
It should be set after properly calling dma_map.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When CMA was first introduced, its primary use was for DMA allocation
and the only way to get CMA memory was to call dma_alloc_coherent. This
put Ion in an awkward position since there was no device structure
readily available and setting one up messed up the coherency model.
These days, CMA can be allocated directly from the APIs. Switch to using
this model to avoid needing a dummy device. This also mitigates some of
the caching problems (e.g. dma_alloc_coherent only returning uncached
memory).
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Frameworks (e.g. Ion) may want to iterate over each possible CMA area to
allow for enumeration. Introduce a function to allow a callback.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Frameworks that may want to enumerate CMA heaps (e.g. Ion) will find it
useful to have an explicit name attached to each region. Store the name
in each CMA structure.
Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
As these are rather late in the cycle, they may sneak over into 4.12.
There is a fix for a regression caused by another fix (hid sensors
hardware seems to vary a lot in how various corner cases are handled).
* ad7303
- fix channel description. Numeric values were being passed as characters
presumably leading to garbage from the userspace interface.
* as3935
- the write data macro was wrong so fix it.
* bmp280
- incorrect handling of negative values as being unsigned broke humidity
calculation.
* hid-sensor
- Restore the poll and hysteresis values after resume as some hardware
doesn't do it.
* stm32-trigger
- buglet in reading the sampling frequency
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Merge tag 'iio-fixes-for-4.11e' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes:
Fifth set of IIO fixes for the 4.11 cycle.
As these are rather late in the cycle, they may sneak over into 4.12.
There is a fix for a regression caused by another fix (hid sensors
hardware seems to vary a lot in how various corner cases are handled).
* ad7303
- fix channel description. Numeric values were being passed as characters
presumably leading to garbage from the userspace interface.
* as3935
- the write data macro was wrong so fix it.
* bmp280
- incorrect handling of negative values as being unsigned broke humidity
calculation.
* hid-sensor
- Restore the poll and hysteresis values after resume as some hardware
doesn't do it.
* stm32-trigger
- buglet in reading the sampling frequency
New device support
* max1117, 1118 and 1119
- new ADC driver
* max9611
- new ADC driver
* pm8xxx hk/xoadc
- new driver with some shared features broken out from the SPMI vadc.
* sun4i-gpadc
- A33 thermal sensor support (with associated rework)
* stm32-dac
- new driver and bindings
* stm32 trigger
- enable support of quadrature encoder device and counter modes
Features
* apds9960
- use the runtime pm for normal suspend
* stm32-adc
- add opition to sest resolution via devicetree
* xoadc
- augment DT bindings to deal with some weird mux cases
Cleanups
* ad5933
- protect direct mode using claim and release helpers
* ade7759
- S_IRUGO and friends to octal in two goes
* adis16203
- drop unnecessary brackets
* hid-sensor
- fix unbalanced pm_runtieme_enable error when probing after remove
* lsm6dsx
- use actual part numbers for device name when known
- simplify data read pin parsing
* mpu3050
- avoid double reporting errors
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Merge tag 'iio-for-4.12d' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes:
Fourth set of IIO new device support, features and cleanups for the 4.12 cycle
New device support
* max1117, 1118 and 1119
- new ADC driver
* max9611
- new ADC driver
* pm8xxx hk/xoadc
- new driver with some shared features broken out from the SPMI vadc.
* sun4i-gpadc
- A33 thermal sensor support (with associated rework)
* stm32-dac
- new driver and bindings
* stm32 trigger
- enable support of quadrature encoder device and counter modes
Features
* apds9960
- use the runtime pm for normal suspend
* stm32-adc
- add opition to sest resolution via devicetree
* xoadc
- augment DT bindings to deal with some weird mux cases
Cleanups
* ad5933
- protect direct mode using claim and release helpers
* ade7759
- S_IRUGO and friends to octal in two goes
* adis16203
- drop unnecessary brackets
* hid-sensor
- fix unbalanced pm_runtieme_enable error when probing after remove
* lsm6dsx
- use actual part numbers for device name when known
- simplify data read pin parsing
* mpu3050
- avoid double reporting errors
This patch fixes the following sparse warning:
ieee80211_tx.c:174:36: incorrect type in assignment (different base types)
ieee80211_tx.c:174:36: expected unsigned short [unsigned] [short] [usertype] <noident>
ieee80211_tx.c:174:36: got restricted __be16 [usertype] <noident>
by adding left side cast to __be16.
Signed-off-by: Martin Karamihov <martinowar@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Changed the type of wpa_ie_len from (int *) to (unsigned int *) in the
function rtw_get_wpa_ie(..) to suppress signedness mismatch warnings in
rtw_generate_ie of the type-
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:1009:60: warning: incorrect
type in argument 2 (different signedness)
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:1009:60: expected int
*wpa_ie_len
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:1009:60: got unsigned
int *<noident>
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Changed the type of sz from (int) to (unsigned int) to suppress
signedness mismatch warnings of the type-
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:258:97: warning:
incorrect type in argument 5 (different signedness)
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:258:97: expected
unsigned int [usertype] *frlen
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:258:97: got int
*<noident>
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Changed the type of len from (int *) to (unsigned int *) in the
function rtw_get_ie(..) and wherever this function is called to
suppress signedness mismatch warnings of the type-
drivers/staging/rtl8188eu//core/rtw_ap.c:78:60: warning: incorrect type
in argument 3 (different signedness)
drivers/staging/rtl8188eu//core/rtw_ap.c:78:60: expected int *len
drivers/staging/rtl8188eu//core/rtw_ap.c:78:60: got unsigned int
*<noident>
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The two different paths for an if statement are identical and hence
we can just replace it with the single statement.
Detected by CoverityScan, CID#1428443 ("Identical code for
different branches")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The comparison of mode >= 0 is redundant as mode is a u32 and this
is always true. Remove this redundant code.
Detected with CoverityScan ("Unsigned compared against 0")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Gstreamer's v4l2src reacted poorly to certain outputs from the bcm2835
video driver's ioctl ops function vidioc_enum_framesizes, so a
workaround was created that could be activated by user input. This
workaround would replace the driver's ioctl ops struct with another,
similar struct--only with no function pointed to by
vidioc_enum_framesizes. With no response, gstreamer would attempt to
continue with some default settings that happened to work better.
However, this bug has been fixed in gstreamer since 2014, so we
shouldn't include this workaround in the stable version of the driver.
Signed-off-by: Kevin Wern <kevin.m.wern@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Driver SDIO code uses helper functions to do IO to the SDIO
device. Current helpers handle IO of a single byte as well as
multi-byte. Driver predominately uses single byte IO. If the
common case is made simple it simplifies the whole driver. The common
case can be made simple by splitting the multi-byte and single byte
calls into separate functions, i.e 4 functions in total, read single
byte, read multi-byte, write single byte, write multi-byte.
Also, we need to handle the debug code. Currently debug calls after
read/write fail access the IO buffer. This buffer, at best, does not hold
useful data on the error path, at worst is uninitialized and holds
garbage.
Split read/write helper functions into two functions each, one for
single byte IO and one for multi-byte IO. Fix all call sites. Do not
change the program logic.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Checkpatch emits WARNING: please, no space before tabs.
Remove space before tabs.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
goto label includes 'err_' suffix but is executed on non-error paths.
Remove err_ suffix from goto label.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
SDIO code currently has a number of unneeded comments. Following
kernel coding style we do not need extraneous comments, especially on
code where it is clear what is being done. Spelling typos can be
fixed.
Remove unnecessary comments, fix typos in comments.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ks_sdio_card structure description does not have a kernel doc format
comment.
Add kernel doc format comment to struct ks_sdio_card.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Currently driver uses a hardware information struct description to
group some SDIO related functionality (work, work queue, sdio private
data pointer). This structure is then embedded in the device private
data structure. Having nested structures described in different header
files means that to view the device private data programmers must open
two header files. This structure could be embedded anonymously in the
device private data and achieve the same result (grouping of function
specific to SDIO) without the need to open multiple headers. However,
the SDIO private data structure already has various different data and
pointers, adding the embedded structure adds little extra meaning and
lengthens all the dereferences throughout the driver, often meaning
addition line breaks and braces. We can increase readability and
reduce code complexity by moving the hardware information data and
pointers to directly be within the device private data structure
description.
While preparing for this refactoring it was noted that the identifier
currently used for the delayed work is 'rw_wq', this is confusing
since the 'wq' suffix typically means 'work queue'. This identifier
would be more meaningful if it used the suffix 'dwork' as does the
declaration of queue_delayed_work() (include/linux/workqueue.h).
The identifier for the work queue is currently 'ks7010sdio_wq'. This
identifier can be shortened without loss of meaning because there is
only one work queue within the driver. Identifier 'wq' is typical
within in-tree driver code and aptly describes the pointer.
Current pointer to the SDIO private data is identified by 'sdio_card',
this is sufficiently meaningful from within the hw_info structure but
once the hw_info_t structure is removed the pointer would be better to
have a prefix appended to it to retain the prior level of meaning.
Move members from struct hw_info_t to struct ks_wlan_private.
Rename identifiers;
struct delayed_work pointer 'rw_wq' to 'rw_dwork'.
struct workqueue_struct pointer 'ks7010sdio_wq' to 'wq'.
struct ks_sdio_card pointer 'sdio_card' to 'ks_sdio_card'.
Remove structure description hw_info_t. Fix init/destroy calls. Fix
all call sites, SDIO private data access calls, and queuing calls.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Currently a pointer to the tasklet_struct used for bottom half
processing on the receive path is within the hw_info_t structure. This
structure is then embedded in the device private data
structure. Having the tasklet_struct nested does not add meaning to
the device private data, device private data already (and typically)
has various data relating to the device, there is no real need to
separate the tasklet_struct to a SDIO specific structure. While not
adding allot of extra meaning having the nested structure means the
programmer must open two header files to read the description of the
device private data, the code would be easier to read if the device
private data struct description was not spread over two files.
Move tasklet_struct out of sdio header file and into the device
private data structure description.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
struct work_struct uses identifier ks_wlan_wakeup_task, this is
confusing because the 'task' suffix implies that this is a
tasklet_struct instead of a work struct. Suffix 'work' would be more
clear. The code would be easier to read if it followed the principle
of least surprise and used the 'work' suffix for a work_struct
identifier.
Rename work_struct structure 'ks_wlan_wakeup_task' to 'wakeup_work'.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
SDIO header file does not use kernel doc format struct
comments. Adding them aids readability and enables documentation to be
built from the source code. Other comments may be tidied up as we do this.
Add kernel format struct comments. Tidy up comments.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
complete_handler() takes void * types as parameters. void * parameters are then
cast to struct types. Call sites for this function either pass in NULL
or pointers to the struct types cast to void *. This casting is
unnecessary and can be removed.
Struct tx_device_buffer (which contains a pointer member to the
complete_handler() function) has as member 'ks_wlan_priv *priv' this is
unnecessary, we always have a pointer to this struct there is no need
to store it here.
The complete_handler can be more clearly defined by using struct
pointer types instead of void * types. The code is currently
unnecessarily complex, storing and passing extraneous pointer
parameters.
Remove unnecessary parameters, unnecessary casting to/from 'void
*'. Fix all call sites involving complete_handler().
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Header has multiple constants defined using preprocessor
directive. In the cases where these are an integer progression an
enumeration type can be used. Doing so adds documentation to the code
and makes the usage explicit. Maintain original constant value, this
value is returned by the device.
Replace (integer progression) preprocessor constants with enumeration
type.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
SDIO header currently defines unused constants READ_STATUS_BUSY and
WRITE_STATUS_IDLE. There are reciprocal constants that are used
READ_STATUS_IDLE and WRITE_STATUS_BUSY. We can roll these into a
single enumeration type and remove the two that are unused.
Add enumeration type containing IDLE/BUSY pair that are currently used
within the SDIO source. Change source to use new enum types.
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
$ make includecheck | grep staging
./drivers/staging/greybus/uart.c: linux/serial.h is included more than once.
Signed-off-by: Darryl T. Agostinelli <dagostinelli@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The struct lu_dirpage elements in lustre_idl.h file are modified to
__le64 and __le32 types since the elements are always converted from
litte endian to processor native format in mdc_request.c file.
Following warnings are removed by this fix.
drivers/staging/lustre/lustre/mdc/mdc_request.c:958:42: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:959:42: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:962:42: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:963:42: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:985:50: warning: cast to restricted __le32
drivers/staging/lustre/lustre/mdc/mdc_request.c:1193:24: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:1328:25: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:1329:23: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:1332:25: warning: cast to restricted __le64
drivers/staging/lustre/lustre/mdc/mdc_request.c:1333:23: warning: cast to restricted __le64
Signed-off-by: Skanda Guruanand <skanda.kashyap@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This resolves a checkpatch warning that "Single statement macros should
not use a do {} while (0) loop" by removing the loop and adjusting line
length accordingly.
Signed-off-by: Craig Inches <Craig@craiginches.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The cport_quiesce() method is mandatory in the case of
the es2 Greybus hd controller to shutdown the cports on
the es2 controller.
In order to add support of another controller which may not
need to shutdown its cports, make the cport_quiesce() optional,
and check if the controller implement it before to use it.
Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The Makefile / Kconfig currently controlling compilation of this code is:
clock/Makefile:obj-$(CONFIG_INTEL_ATOMISP) += vlv2_plat_clock.o
atomisp/Kconfig:menuconfig INTEL_ATOMISP
atomisp/Kconfig: bool "Enable support to Intel MIPI camera drivers"
...meaning that it currently is not being built as a module by anyone.
Lets remove the modular code that is essentially orphaned, so that
when reading the driver there is no doubt it is builtin-only.
Since module_init was already not in use by this driver, the init
ordering remains unchanged with this commit.
Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code.
We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Cc: linux-media@vger.kernel.org
Cc: devel@driverdev.osuosl.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This removes a strange 'list' file in
drivers/staging/media/atomisp/pci/atomisp2/ that was not being used for
anything.
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Previous patches deleted files, but the Makefile still referenced their
.o files. Fix this up by removing them in the Makefile.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
While calculating the compensation of the humidity there are negative values
interpreted as unsigned because of unsigned variables used. These values as
well as the constants need to be casted to signed as indicated by the
documentation of the sensor.
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Matt Ranostay <matt.ranostay@konsulko.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
APDS9960 can safely force runtime suspend if the system wants
to enter system-wide suspend
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Add support for STMicroelectronics STM32 DAC. It's a 12-bit, voltage
output digital-to-analog converter. It has two output channels, each
with its own converter.
It supports 8 bits or 12bits left/right aligned data format. Only
12bits right-aligned is used here. It has built-in noise or
triangle waveform generator, and supports external triggers for
conversions.
Each channel can be used independently, with separate trigger, then
separate IIO devices are used to handle this. Core driver is intended
to share common resources such as clock, reset, reference voltage and
registers.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Simplify st_lsm6dsx_of_get_drdy_pin routine since of_property_read_u32
error conditions are already managed in st_lsm6dsx_get_drdy_reg()
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This fixes the coding style issue of using (S_IWUSR | S_IRUGO) in place of
4-digit octal numbers.
Signed-off-by: Chen Guanqiao <chen.chenchacha@foxmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This device operates in DIRECT_MODE and BUFFER_HARDWARE mode.
Replace usages of iio_dev->mlock with iio_device_{claim|release}_direct_mode()
helper functions to guarantee DIRECT mode and consequently protect
BUFFER mode too.
Add and use a device private lock to protect against conflicting access of the
state data.
This helps with IIO subsystem redefining iio_dev->mlock to be used by
the IIO core only for protecting device operating mode changes.
ie. Changes between INDIO_DIRECT_MODE, INDIO_BUFFER_* modes.
Protect changing of attributes inside ad5933_store(). Attributes
can no longer be changed while in buffered mode.
Remove lock from ad5933_work() because buffer mode should be enabled
when we reach this, and claiming DIRECT mode in all the other places
should protect it.
Signed-off-by: Narcisa Ana Maria Vasile <narcisaanamaria12@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This adds max1117/max1118/max1119 8-bit, dual-channel ADC driver.
This new driver uses the zero length spi_transfers with the cs_change
flag set and/or the non-zero delay_usecs.
1. The zero length transfer with the spi_transfer.cs_change set is
required in order to select CH1. The chip select line must be brought
high and low again without transfer.
2. The zero length transfer with the spi_transfer.delay_usecs > 0 is
required for waiting the conversion to be complete. The conversion
begins with the falling edge of the chip select. During the conversion
process, SCLK is ignored.
These two usages are unusual. But the spi controller drivers that use
a default implementation of transfer_one_message() are likely to work.
(I've tested this adc driver with spi-omap2-mcspi and spi-xilinx)
On the other hand, some spi controller drivers that have their own
transfer_one_message() may not work. But at least for the zero length
transfer with delay_usecs > 0, I'm proposing a new testcase for the
spi-loopback-test that can test whether the delay_usecs setting has
taken effect.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Laura Abbott