Commit Graph

1390 Commits

Author SHA1 Message Date
Linus Torvalds
50686e8a3a Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC platform updates from Olof Johansson:
 "New or improved SoC support:

   - add support for Atmel's SAMA5D2 SoC
   - add support for Freescale i.MX6UL
   - improved support for TI's DM814x platform
   - misc fixes and improvements for RockChip platforms
   - Marvell MVEBU suspend/resume support

  A few driver changes that ideally would belong in the drivers branch
  are also here (acked by appropriate maintainers):

   - power key input driver for Freescale platforms (svns)
   - RTC driver updates for Freescale platforms (svns/mxc)
   - clk fixes for TI DM814/816X

  + a bunch of other changes for various platforms"

* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (83 commits)
  ARM: rockchip: pm: Fix PTR_ERR() argument
  ARM: imx: mach-imx6ul: Fix allmodconfig build
  clk: ti: fix for definition movement
  ARM: uniphier: drop v7_invalidate_l1 call at secondary entry
  memory: kill off set_irq_flags usage
  rtc: snvs: select option REGMAP_MMIO
  ARM: brcmstb: select ARCH_DMA_ADDR_T_64BIT for LPAE
  ARM: BCM: Enable ARM erratum 798181 for BRCMSTB
  ARM: OMAP2+: Fix power domain operations regression caused by 81xx
  ARM: rockchip: enable PMU_GPIOINT_WAKEUP_EN when entering shallow suspend
  ARM: rockchip: set correct stabilization thresholds in suspend
  ARM: rockchip: rename osc_switch_to_32k variable
  ARM: imx6ul: add fec MAC refrence clock and phy fixup init
  ARM: imx6ul: add fec bits to GPR syscon definition
  rtc: mxc: add support of device tree
  dt-binding: document the binding for mxc rtc
  rtc: mxc: use a second rtc clock
  ARM: davinci: cp_intc: use IRQCHIP_SKIP_SET_WAKE instead of irq_set_wake callback
  soc: mediatek: Fix SCPSYS compilation
  ARM: at91/soc: add basic support for new sama5d2 SoC
  ...
2015-09-01 12:18:40 -07:00
Linus Torvalds
cf9d615f7f Merge tag 'regulator-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator updates from Mark Brown:
 "The biggest changes in the core this time around have been some
  refactorings that move us towards being able to drop the list of
  regulators maintained by the core and instead just use the driver
  model list maintained for the class devices for regulators which will
  make the code smaller and avoid some potential bugs.

  Otherwise another fairly quiet release for the regulator API,
  highlights include:

   - a new API for setting voltages based on a minimum, target, maximum
     triplet

   - support for continuous voltage ranges rather than tables of
     explicit steps in the PWM regulator, requiring less explicit
     configuration

   - new driver support for Dialog DA9215, Maxim 77843, Mediatek MT6311
     and Qualcomm RPM"

* tag 'regulator-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (70 commits)
  regulator: mt6311: fix platform_no_drv_owner.cocci warnings
  regulator: ltc3589: Remove unnecessary MODULE_ALIAS()
  regulator: ad5398: Remove unnecessary MODULE_ALIAS()
  regulator: pfuze100: Remove unnecessary MODULE_ALIAS()
  regulator: core: use debug level print in regulator_check_drms
  regulator: lp872x: handle error case
  regulator: lp872x: use the private data instead of updating I2C device platform data
  regulator: isl9305: Export OF module alias information
  regulators: max77693: register driver earlier to avoid deferred probe
  regulator: qcom_smd: Set n_voltages for pm8941_lnldo
  regulator: core: Use IS_ERR_OR_NULL()
  regulator: core: Define regulator_set_voltage_triplet()
  regulator: Regulator driver for the Qualcomm RPM
  regulator: pbias: Fix broken pbias disable functionality
  regulator: core: Spelling fix
  regulator: core: Use class device list for regulator_list in late init
  regulator: core: Move more deallocation into class unregister
  regulator: core: Reduce rdev locking region when releasing regulator
  Input: Remove the max77843 haptic driver
  Input: max77693: Add support for Maxim 77843
  ...
2015-08-31 15:49:19 -07:00
Roger Quadros
92b7cb5dc8 extcon: palmas: Support GPIO based USB ID detection
Some palmas based chip variants do not have OTG based ID logic.
For these variants we rely on GPIO based USB ID detection.

These chips do have VBUS comparator for VBUS detection so we
continue to use the old way of detecting VBUS.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2015-08-10 21:26:25 +09:00
Fugang Duan
9f55eb9244 ARM: imx6ul: add fec bits to GPR syscon definition
FEC requires additional bits to select refrence clock.

Signed-off-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
2015-08-05 20:52:07 +08:00
Krzysztof Kozlowski
309a3e00a5 mfd/extcon: max77843: Rename defines to allow inclusion with max77693
Add MAX77843_MUIC prefix to some of the defines used in max77843 extcon
driver so the max77693-private.h can be included simultaneously with
max77843-private.h.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:30 +01:00
Krzysztof Kozlowski
cceb433a1e mfd/extcon: max77693: Rename defines to allow inclusion with max77843
Add MAX77693 prefix to some of the defines used in max77693 extcon
driver so the max77693-private.h can be included simultaneously with
max77843-private.h.

Additionally use BIT() macro in header.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:30 +01:00
Krzysztof Kozlowski
bc1aadc186 drivers: max77843: Switch to common max77693 state container
Switch to the same definition of state container as in MAX77693 drivers.
This will allow usage of one regulator driver in both devices: MAX77693
and MAX77843.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:30 +01:00
Krzysztof Kozlowski
61b305cd2a drivers: max77693: Move state container to common header
This prepares for merging some of the drivers between max77693 and
max77843 so the child MFD driver can be attached to any parent MFD main
driver.

Move the state container to common header file. Additionally add
consistent 'i2c' prefixes to its members (of 'struct i2c_client' type).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:30 +01:00
Krzysztof Kozlowski
b3b58cee8a mfd: max77693: Store I2C device type as enum and add default unknown
Store the device type (obtained from i2c_device_id) as an enum and add a
default type of unknown to distinguish from case when this is not set
at all.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:29 +01:00
Krzysztof Kozlowski
0afab670bd mfd/extcon: max77693: Remove unused extern declarations and max77693_dev members
Clean up the max77693 private header file by removing:
1. Left-overs from previous way of interrupt handling (driver uses
   regmap_irq_chip).
2. Unused members of struct 'max77693_dev' related to interrupts in
   extcon driver.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-07-16 21:39:29 +01:00
Linus Torvalds
d87823813f Merge tag 'char-misc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver updates from Greg KH:
 "Here's the big char/misc driver pull request for 4.2-rc1.

  Lots of mei, extcon, coresight, uio, mic, and other driver updates in
  here.  Full details in the shortlog.  All of these have been in
  linux-next for some time with no reported problems"

* tag 'char-misc-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (176 commits)
  mei: me: wait for power gating exit confirmation
  mei: reset flow control on the last client disconnection
  MAINTAINERS: mei: add mei_cl_bus.h to maintained file list
  misc: sram: sort and clean up included headers
  misc: sram: move reserved block logic out of probe function
  misc: sram: add private struct device and virt_base members
  misc: sram: report correct SRAM pool size
  misc: sram: bump error message level on unclean driver unbinding
  misc: sram: fix device node reference leak on error
  misc: sram: fix enabled clock leak on error path
  misc: mic: Fix reported static checker warning
  misc: mic: Fix randconfig build error by including errno.h
  uio: pruss: Drop depends on ARCH_DAVINCI_DA850 from config
  uio: pruss: Add CONFIG_HAS_IOMEM dependence
  uio: pruss: Include <linux/sizes.h>
  extcon: Redefine the unique id of supported external connectors without 'enum extcon' type
  char:xilinx_hwicap:buffer_icap - change 1/0 to true/false for bool type variable in function buffer_icap_set_configuration().
  Drivers: hv: vmbus: Allocate ring buffer memory in NUMA aware fashion
  parport: check exclusive access before register
  w1: use correct lock on error in w1_seq_show()
  ...
2015-06-26 14:51:15 -07:00
Linus Torvalds
c11d716218 Merge tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC cleanups from Kevin Hilman:
 "A relatively small setup of cleanups this time around, and similar to
  last time the bulk of it is removal of legacy board support:

   - OMAP: removal of legacy (non-DT) booting for several platforms

   - i.MX: remove some legacy board files"

* tag 'armsoc-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (36 commits)
  ARM: fix EFM32 build breakage caused by cpu_resume_arm
  ARM: 8389/1: Add cpu_resume_arm() for firmwares that resume in ARM state
  ARM: v7 setup function should invalidate L1 cache
  mach-omap2: Remove use of deprecated marco, PTR_RET in devices.c
  ARM: OMAP2+: Remove calls to deprecacted marco,PTR_RET in the files,fb.c and pmu.c
  ARM: OMAP2+: Constify irq_domain_ops
  ARM: OMAP2+: use symbolic defines for console loglevels instead of numbers
  ARM: at91: remove useless Makefile.boot
  ARM: at91: remove at91rm9200_sdramc.h
  ARM: at91: remove mach/at91_ramc.h and mach/at91rm9200_mc.h
  ARM: at91/pm: use the atmel-mc syscon defines
  pcmcia: at91_cf: Use syscon to configure the MC/smc
  ARM: at91: declare the at91rm9200 memory controller as a syscon
  mfd: syscon: Add Atmel MC (Memory Controller) registers definition
  ARM: at91: drop sam9_smc.c
  ata: at91: use syscon to configure the smc
  ARM: ux500: delete static resource defines
  ARM: ux500: rename ux500_map_io
  ARM: ux500: look up PRCMU resource from DT
  ARM: ux500: kill off L2CC static map
  ...
2015-06-26 11:08:27 -07:00
Linus Torvalds
14738e0331 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Pull input subsystem updates from Dmitry Torokhov:
 "Thanks to Samuel Thibault input device (keyboard) LEDs are no longer
  hardwired within the input core but use LED subsystem and so allow use
  of different triggers; Hans de Goede did a large update for the ALPS
  touchpad driver; we have new TI drv2665 haptics driver and DA9063
  OnKey driver, and host of other drivers got various fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (55 commits)
  Input: pixcir_i2c_ts - fix receive error
  MAINTAINERS: remove non existent input mt git tree
  Input: improve usage of gpiod API
  tty/vt/keyboard: define LED triggers for VT keyboard lock states
  tty/vt/keyboard: define LED triggers for VT LED states
  Input: export LEDs as class devices in sysfs
  Input: cyttsp4 - use swap() in cyttsp4_get_touch()
  Input: goodix - do not explicitly set evbits in input device
  Input: goodix - export id and version read from device
  Input: goodix - fix variable length array warning
  Input: goodix - fix alignment issues
  Input: add OnKey driver for DA9063 MFD part
  Input: elan_i2c - add product IDs FW names
  Input: elan_i2c - add support for multi IC type and iap format
  Input: focaltech - report finger width to userspace
  tty: remove platform_sysrq_reset_seq
  Input: synaptics_i2c - use proper boolean values
  Input: psmouse - use true instead of 1 for boolean values
  Input: cyapa - fix a few typos in comments
  Input: stmpe-ts - enforce device tree only mode
  ...
2015-06-24 19:56:58 -07:00
Linus Torvalds
84e9c87e6f Merge tag 'mfd-for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
Pull MFD updates from Lee Jones:
 "Changes to existing drivers:
   - Constify structures; throughout the subsystem
   - Move support to DT in; cros_ec
   - DT changes and documentation; cros-ec, max77693, max77686, arizona, da9063
   - ACPI changes and documentation; mfd-core
   - Use different platform specific API in; cros_ec_*, arizona-core
   - Remove unused parent field from; cros_ec_i2c
   - Add wake-up/reset delay in; cross_ec_spi, arizona-core
   - Staticise structures/functions in; cros_ec
   - Remove redundant code; arizona-core, max77686
   - Bugfix; twl4030-power
   - Allow compile test; aat2870, tps65910
   - MAINTAINERS adaptions; samsung, syscon
   - Resource Management (devm_*); arizona-core
   - Refactor Reset code; arizona-core
   - Insist on at least one full boot; arizona-core
   - Trivial formatting; arizona-core
   - Add low-power-sleep; arizona-core
   - IRQ ONESHOT changes; twl4030-irq, mc13xxx-core, wm831x-auxadc, htc-i2cpld,
                          wm8350-core, ab8500-debugfs, ab8500-gpadc, si476x-i2c

  (Re-)moved drivers:
   - Move protocol helpers out to drivers/platform; cros_ec

  New drivers/supported devices:
   - Add support for AXP22x into axp20x
   - Add support for OnKey into da9063-core
   - Add support for Pinctrl into mt6397-core
   - New STMicroelectronics LPC Watchdog driver
   - New STMicroelectronics LPC Real-Time Clock driver"

* tag 'mfd-for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (59 commits)
  mfd: lpc_ich: Assign subdevice ids automatically
  mfd: si476x-i2c: Pass the IRQF_ONESHOT flag
  mfd: ab8500-gpadc: Pass the IRQF_ONESHOT flag
  mfd: ab8500-debugfs: Pass the IRQF_ONESHOT flag
  mfd: wm8350-core: Pass the IRQF_ONESHOT flag
  mfd: htc-i2cpld: Pass the IRQF_ONESHOT flag
  mfd: wm831x-auxadc: Pass the IRQF_ONESHOT flag
  mfd: mc13xxx-core: Pass the IRQF_ONESHOT flag
  mfd: twl4030-irq: Pass the IRQF_ONESHOT flag
  mfd: mt6397-core: Add GPIO sub-module support
  mfd: arizona: Add convience defines for micd_rate/micd_bias_starttime
  mfd: dt: Add bindings for DA9063 OnKey
  mfd: da9063: Add support for OnKey driver
  mfd: arizona: Fix incorrect Makefile conditionals
  mfd: arizona: Add stub for wm5102_patch()
  mfd: Check ACPI device companion before checking resources
  Documentation: Add WM8998/WM1814 device tree bindings
  mfd: arizona: Split INx_MODE into two fields
  mfd: wm5110: Add delay before releasing reset line
  mfd: arizona: Add better support for system suspend
  ...
2015-06-23 17:31:27 -07:00
Richard Fitzgerald
7e2d67e94a mfd: arizona: Add stub for wm5102_patch()
For the WM5102 there is a dependency in the core code on wm5102_patch()
which only exists when CONFIG_MFD_WM5102 is defined. To avoid having
to sprinkle #ifdefs around the code it is given an alternative empty
stub version when CONFIG_MFD_WM5102 is deselected

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-22 12:25:18 +01:00
Richard Fitzgerald
fc027d138b mfd: arizona: Split INx_MODE into two fields
Later arizona silicon has the single/differential selector
in a different register, and IN1_MODE only selects between
analogue or digital. Prepare for this by splitting the
INx_MODE definition into two fields.

Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-22 12:25:16 +01:00
Charles Keepax
e6cb73410a mfd: arizona: Add better support for system suspend
Allow the chip to completely power off if we enter runtime suspend and
there is no jack detection active. This is helpful for systems where
system suspend might remove the supplies to the CODEC, without informing
us. Note the powering off is done in runtime suspend rather than system
suspend, because we need to hold reset until the first time DCVDD is
powered anyway (which would be in runtime resume), and we might as well
save the extra power.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-22 12:25:14 +01:00
Javier Martinez Canillas
8be4efad81 mfd: max77686: Remove unused struct max77686_opmode_data
The defined struct max77686_opmode_data isn't used neither by
the max77686 mfd driver nor the drivers for its sub-devices.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-22 12:25:05 +01:00
Krzysztof Kozlowski
7ce7b26f84 mfd: Constify regmap and irq configuration data
Constify in various drivers configuration data which is not modified:
 - regmap_irq_chip,
 - individual regmap_irq's in array,
 - regmap_config,
 - irq_domain_ops,

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-22 12:25:01 +01:00
Lee Jones
79aa79342c Merge branches 'ib-mfd-watchdog-rtc-4.2', 'ib-mfd-regulator-4.2' and 'ib-mfd-i2c-input-chrome-4.2' into ibs-for-mfd-merged 2015-06-22 12:24:25 +01:00
Gwendal Grignou
57b33ff077 mfd: cros_ec: Support multiple EC in a system
Chromebooks can have more than one Embedded Controller so the
cros_ec device id has to be incremented for each EC registered.

Add a new structure to represent multiple EC as different char
devices (e.g: /dev/cros_ec, /dev/cros_pd). It connects to
cros_ec_device and allows sysfs inferface for cros_pd.

Also reduce number of allocated objects, make chromeos sysfs
class object a static and add refcounting to prevent object
deletion while command is in progress.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-15 13:18:23 +01:00
Stephen Barber
d365407079 mfd: cros_ec: add bus-specific proto v3 code
Add proto v3 support to the SPI, I2C, and LPC.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-15 13:18:22 +01:00
Stephen Barber
2c7589af3c mfd: cros_ec: add proto v3 skeleton
Add support in cros_ec.c to handle EC host command protocol v3.
For v3+, probe for maximum shared protocol version and max
request, response, and passthrough sizes. For now, this will
always fall back to v2, since there is no bus-specific code
for handling proto v3 packets.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-15 13:18:21 +01:00
Stephen Barber
256ab950bd mfd: cros_ec: rev cros_ec_commands.h
Update cros_ec_commands.h to the latest version in the EC
firmware sources and add power domain and passthru commands.

Also, update lightbar to use new command names.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-15 13:18:20 +01:00
Javier Martinez Canillas
a841178445 mfd: cros_ec: Use a zero-length array for command data
Commit 1b84f2a4cd ("mfd: cros_ec: Use fixed size arrays to transfer
data with the EC") modified the struct cros_ec_command fields to not
use pointers for the input and output buffers and use fixed length
arrays instead.

This change was made because the cros_ec ioctl API uses that struct
cros_ec_command to allow user-space to send commands to the EC and
to get data from the EC. So using pointers made the API not 64-bit
safe. Unfortunately this approach was not flexible enough for all
the use-cases since there may be a need to send larger commands
on newer versions of the EC command protocol.

So to avoid to choose a constant length that it may be too big for
most commands and thus wasting memory and CPU cycles on copy from
and to user-space or having a size that is too small for some big
commands, use a zero-length array that is both 64-bit safe and
flexible. The same buffer is used for both output and input data
so the maximum of these values should be used to allocate it.

Suggested-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2015-06-15 13:18:19 +01:00