yangkai [Wed, 22 Aug 2012 09:09:10 +0000 (17:09 +0800)]
don't disable usb clock
chenxing [Wed, 22 Aug 2012 08:17:05 +0000 (16:17 +0800)]
rk2928:sdk: set hclk_otg0/1 parent to clk_hclk_usb_peri
cym [Wed, 22 Aug 2012 08:11:12 +0000 (16:11 +0800)]
rk3066:fix early suspend DDR frequency from 100Mhz to 120Mhz
root [Wed, 22 Aug 2012 07:50:07 +0000 (15:50 +0800)]
camera rk30 : do crop by cif when digital zoom,fix bug of request_mem_region twice.
ywj [Wed, 22 Aug 2012 04:44:13 +0000 (12:44 +0800)]
amend size of bmp logo and zoom out display
kfx [Wed, 22 Aug 2012 04:36:23 +0000 (12:36 +0800)]
rk2928: a720: camera(gc0308) support
hcy [Wed, 22 Aug 2012 02:21:57 +0000 (10:21 +0800)]
resume ZQ1CR[0]
黄涛 [Tue, 21 Aug 2012 12:17:26 +0000 (20:17 +0800)]
rk30: phonepad: defconfig: support android 4.1
黄涛 [Tue, 21 Aug 2012 12:16:22 +0000 (20:16 +0800)]
rk2928: a720: defconfig: support android 4.1
黄涛 [Tue, 21 Aug 2012 12:16:09 +0000 (20:16 +0800)]
rk2928: sdk: defconfig: support android 4.1
黄涛 [Tue, 21 Aug 2012 11:55:23 +0000 (19:55 +0800)]
Merge remote-tracking branch 'origin/develop-3.0-jb' into develop-3.0
xbw [Tue, 21 Aug 2012 10:17:08 +0000 (18:17 +0800)]
sdmmc: In order to improve the timing,set HOLD_REG to 1,mainly used in RK2928 and RK31.
黄涛 [Tue, 21 Aug 2012 10:06:42 +0000 (18:06 +0800)]
rk: add RK_USB_UART config
黄涛 [Tue, 21 Aug 2012 07:53:18 +0000 (15:53 +0800)]
Merge remote-tracking branch 'aosp/android-3.0' into develop-3.0-jb
Conflicts:
drivers/mmc/core/core.c
drivers/net/wireless/bcm4319/dhd_sdio.c
drivers/net/wireless/bcm4319/include/linux_osl.h
drivers/net/wireless/bcm4319/wl_iw.c
drivers/net/wireless/bcmdhd/dhd.h
drivers/net/wireless/bcmdhd/dhd_cfg80211.c
drivers/net/wireless/bcmdhd/dhd_linux.c
drivers/net/wireless/bcmdhd/include/wlioctl.h
drivers/net/wireless/bcmdhd/wl_cfg80211.c
drivers/net/wireless/bcmdhd/wldev_common.c
drivers/net/wireless/bcmdhd/wldev_common.h
yangkai [Tue, 21 Aug 2012 06:15:42 +0000 (14:15 +0800)]
add wakeup_key at vbus disconnect
黄涛 [Tue, 21 Aug 2012 06:14:24 +0000 (14:14 +0800)]
Merge remote-tracking branch 'origin/develop-3.0' into develop-3.0-jb
Conflicts:
include/net/cfg80211.h
yangkai [Tue, 21 Aug 2012 06:13:14 +0000 (14:13 +0800)]
Merge branch 'develop-3.0' of ssh://10.10.10.29/rk/kernel into develop-3.0
黄涛 [Tue, 21 Aug 2012 05:11:48 +0000 (13:11 +0800)]
Merge remote-tracking branch 'stable/linux-3.0.y' into develop-3.0-jb
Conflicts:
Makefile
drivers/net/tun.c
drivers/net/wireless/rt2x00/rt61pci.c
drivers/usb/core/hub.c
sound/soc/codecs/wm8994.c
wlf [Tue, 21 Aug 2012 04:41:07 +0000 (12:41 +0800)]
RK2928 USB
张晴 [Tue, 21 Aug 2012 04:04:40 +0000 (12:04 +0800)]
rk2928:sdk and a720:support pmu sleep
黄涛 [Tue, 21 Aug 2012 03:57:29 +0000 (11:57 +0800)]
logo: bmp: default n
lw [Tue, 21 Aug 2012 03:51:35 +0000 (11:51 +0800)]
phonepad:add touch screen Kconfig again
许盛飞 [Tue, 21 Aug 2012 03:23:00 +0000 (11:23 +0800)]
rk30: rm the sram_printch(8)
许盛飞 [Tue, 21 Aug 2012 03:13:44 +0000 (11:13 +0800)]
slove the bug -- support gpio3 and gpio4 interrupt wake up sysytem
Zheng Yang [Tue, 21 Aug 2012 01:50:46 +0000 (09:50 +0800)]
rk2928: acodec: move audio codec platform device registration to board file to configure speaker control pin.
黄涛 [Tue, 21 Aug 2012 01:36:17 +0000 (09:36 +0800)]
rk: usb_detect: mark board_usb_detect_init as __init, use irq_set_irq_type support both edge trigger
黄涛 [Tue, 21 Aug 2012 01:08:32 +0000 (09:08 +0800)]
rk2928: usb_detect: mark bvalid_init as __init, clear bvalid irq when init
Mike J. Chen [Thu, 24 May 2012 22:12:36 +0000 (15:12 -0700)]
ARM: disable preemption in machine_shutdown
Since the smp call to stop the other cpus are handled in those
cpus in interrupt context, there's a potential for those smp
handlers to interrupt threads holding spin locks (such as the
one a mutex holds). This prevents those threads from ever
releasing their spin lock, so if the cpu doing the shutdown
is allowed to switch to another thread that tries to grab the
same lock/mutex, we could get into a deadlock (the spin lock
call is called with preemption disabled in the mutex lock code).
To avoid that possibility, disable preemption before doing the
smp_send_stop().
Change-Id: I7976c5382d7173fcb3cd14da8cc5083d442b2544
Signed-off-by: Mike J. Chen <mjchen@google.com>
宋秀杰 [Mon, 20 Aug 2012 14:35:49 +0000 (22:35 +0800)]
phonepad: make rt3261 incall volume control work.
黄涛 [Mon, 20 Aug 2012 12:53:41 +0000 (20:53 +0800)]
rk2928: pm: fix unable to suspend bug
黄涛 [Mon, 20 Aug 2012 12:52:44 +0000 (20:52 +0800)]
rk2928: usb_detect: support bvalid irq wake up system
chenxing [Mon, 20 Aug 2012 12:31:16 +0000 (20:31 +0800)]
rk2928:sdk: default disable gpio clk
chenxing [Mon, 20 Aug 2012 12:27:32 +0000 (20:27 +0800)]
rk2928:sdk: rename gpio(i)
chenxing [Mon, 20 Aug 2012 12:19:06 +0000 (20:19 +0800)]
rk2928:sdk: disable unused clocks
chenxing [Mon, 20 Aug 2012 12:14:33 +0000 (20:14 +0800)]
rk2928:a720: setup frequency 600M for a720
Zheng Yang [Mon, 20 Aug 2012 10:40:47 +0000 (18:40 +0800)]
rk2928 codec: add speaker control.
hcy [Mon, 20 Aug 2012 09:58:39 +0000 (17:58 +0800)]
fix DLL off bug, fix ZQCR[1] bug, add to support change BL, add dsb()
xbw [Mon, 20 Aug 2012 09:16:05 +0000 (17:16 +0800)]
sdmmc: some card, SDHC 32G Class10, maybe miss the nobusy_INT. so close the nobusy_INT function
root [Mon, 20 Aug 2012 08:18:30 +0000 (16:18 +0800)]
camera rk30: add scale by arm,rga and pp.
gwl [Mon, 20 Aug 2012 06:50:02 +0000 (14:50 +0800)]
add rtl8188eu to rkwifi_sys_iface.c
chenxing [Mon, 20 Aug 2012 06:22:55 +0000 (14:22 +0800)]
rk2928:sdk: codec pll for sclk_lcdc only, aclk_vio_pre need yxj fixed, move other clks to general pll
kfx [Mon, 20 Aug 2012 05:16:32 +0000 (13:16 +0800)]
rk2928: a720: touchscren && camera && sdmmc && usb wifi support
ywj [Mon, 20 Aug 2012 03:46:25 +0000 (11:46 +0800)]
Merge branch 'develop-3.0' of ssh://10.10.10.29/rk/kernel into develop-3.0
ywj [Mon, 20 Aug 2012 03:40:56 +0000 (11:40 +0800)]
remove bmp_logo option and del rk29_backlight.c printklog
ywj [Mon, 20 Aug 2012 03:29:51 +0000 (11:29 +0800)]
amend DEVICE_ATTR 0660 of rk29_keys and rk29_backlight factorytool
yzq [Mon, 20 Aug 2012 02:29:14 +0000 (10:29 +0800)]
rk2928 hdmi: remove unnecessary files and update low power mode
Zheng Yang [Mon, 20 Aug 2012 01:18:06 +0000 (09:18 +0800)]
rk30 hdmi: Modify Kconfig to support hdcp.
lw [Sun, 19 Aug 2012 11:48:54 +0000 (19:48 +0800)]
sensor:mask some debug information
lw@rock-chips.com [Sun, 19 Aug 2012 11:39:42 +0000 (19:39 +0800)]
sensor:add setting gsensor orientation online support
kfx [Sun, 19 Aug 2012 11:11:31 +0000 (19:11 +0800)]
rk2928: a720: cpufreq(1G) && pmic sleep io && backlight && gsensor
lw [Sun, 19 Aug 2012 10:27:06 +0000 (18:27 +0800)]
rk2928 a720:add mma7660 support
lw [Sun, 19 Aug 2012 10:17:03 +0000 (18:17 +0800)]
sensor:add gsensor mma7660 support
chenxing [Sun, 19 Aug 2012 07:57:41 +0000 (15:57 +0800)]
rk2928:a720: fix vdd_log dvfs error
kfx [Sun, 19 Aug 2012 07:18:44 +0000 (15:18 +0800)]
rk2928: a720 init
黄涛 [Fri, 17 Aug 2012 14:59:47 +0000 (22:59 +0800)]
Revert "add usb wifi rtl8188eus support."
This reverts commit
1c9e9080691b9ce4f7e8c42643fa026bb020c596.
Conflicts:
drivers/net/wireless/Kconfig
drivers/net/wireless/Makefile
drivers/net/wireless/wifi_sys/rkwifi_sys_iface.c
黄涛 [Fri, 17 Aug 2012 14:40:12 +0000 (22:40 +0800)]
rk2928: sdk: defconfig: disable bmp logo
黄涛 [Fri, 17 Aug 2012 14:37:19 +0000 (22:37 +0800)]
rk2928: devices.c: add dummy i2c check idle
黄涛 [Fri, 17 Aug 2012 14:16:19 +0000 (22:16 +0800)]
rk30: sdk: board-rk30-sdk.c include board-rk30-sdk-camera.c and board-rk30-sdk-key.c
黄涛 [Fri, 17 Aug 2012 14:08:40 +0000 (22:08 +0800)]
rk30: phonepad: fix gcc warning, "CONFIG_RK30_PWM_REGULATOR" is not defined
黄涛 [Fri, 17 Aug 2012 14:08:24 +0000 (22:08 +0800)]
rk30: sdk: fix gcc warning, "CONFIG_RK30_PWM_REGULATOR" is not defined
黄涛 [Fri, 17 Aug 2012 14:08:08 +0000 (22:08 +0800)]
rk2928: sdk: fix gcc warning, "CONFIG_RK30_PWM_REGULATOR" is not defined
黄涛 [Fri, 17 Aug 2012 13:48:20 +0000 (21:48 +0800)]
Merge remote-tracking branch 'origin/develop-3.0-rk2928' into develop-3.0
Conflicts:
arch/arm/mach-rk30/include/mach/rk30_camera.h
arch/arm/plat-rk/include/plat/rk_camera.h
drivers/gpio/gpio-tps65910.c
drivers/media/video/rk30_camera_oneframe.c
drivers/mmc/host/rk29_sdmmc.c
drivers/net/wireless/Kconfig
drivers/net/wireless/Makefile
drivers/net/wireless/wifi_sys/rkwifi_sys_iface.c
drivers/regulator/rk30-pwm-regulator.c
drivers/usb/dwc_otg/dwc_otg_driver.c
drivers/usb/dwc_otg/dwc_otg_hcd.c
drivers/usb/dwc_otg/dwc_otg_pcd.c
sound/soc/codecs/Makefile
sound/soc/rk29/Kconfig
黄涛 [Fri, 17 Aug 2012 11:20:47 +0000 (19:20 +0800)]
gitignore: ignore scripts/bmptologo
黄涛 [Fri, 17 Aug 2012 11:17:19 +0000 (19:17 +0800)]
bmptologo: fix gcc warning
ywj [Fri, 17 Aug 2012 10:20:55 +0000 (18:20 +0800)]
gsensor code result in system reboot,gsensor code by lw update
zyc [Fri, 17 Aug 2012 10:01:02 +0000 (18:01 +0800)]
camera : support arm and rga to do digital zoom.
ywj [Fri, 17 Aug 2012 09:58:04 +0000 (17:58 +0800)]
Merge branch 'develop-3.0' of ssh://10.10.10.29/rk/kernel into develop-3.0
ywj [Fri, 17 Aug 2012 09:57:15 +0000 (17:57 +0800)]
add bmp photo for factory and del fb test log
yangkai [Fri, 17 Aug 2012 08:20:17 +0000 (16:20 +0800)]
merge rk2928 usb
gwl [Fri, 17 Aug 2012 07:10:51 +0000 (15:10 +0800)]
Merge branch 'develop-3.0-rk2928' of ssh://10.10.10.29/rk/kernel into develop-3.0-rk2928
gwl [Fri, 17 Aug 2012 07:10:37 +0000 (15:10 +0800)]
add usb wifi rtl8188eus support.
Zheng Yang [Fri, 17 Aug 2012 06:33:23 +0000 (14:33 +0800)]
rk2929 acodec: for internal audio codec, mclk = 64*bclk = 256*lrclk.
张晴 [Fri, 17 Aug 2012 06:30:45 +0000 (14:30 +0800)]
rk30:sdk:support wm8326 early suspend and modify dcdc or ldo mode when in early suspend
ddl [Fri, 17 Aug 2012 04:24:33 +0000 (12:24 +0800)]
camera rk29: add support zoom by arm, version update to v0.x.11
ywj [Fri, 17 Aug 2012 03:33:49 +0000 (11:33 +0800)]
Merge branch 'develop-3.0' of ssh://10.10.10.29/rk/kernel into develop-3.0
ywj [Fri, 17 Aug 2012 03:32:40 +0000 (11:32 +0800)]
amend DEVICE_ATTR of rk30_factory_adc_battery for cts
xbw [Fri, 17 Aug 2012 02:49:46 +0000 (10:49 +0800)]
Merge branch 'develop-3.0' of ssh://10.10.10.29/rk/kernel into develop-3.0
xbw [Fri, 17 Aug 2012 02:49:17 +0000 (10:49 +0800)]
sdmmc: prepare for RK2918 and RK31
zyc [Fri, 17 Aug 2012 02:31:42 +0000 (10:31 +0800)]
camera : fix conflict when merge to rk30
root [Fri, 17 Aug 2012 02:25:57 +0000 (10:25 +0800)]
camera rk30 : fix conflict when merge 2928
ywj [Fri, 17 Aug 2012 02:03:12 +0000 (10:03 +0800)]
Merge branch 'develop-3.0' of ssh://10.10.10.29/rk/kernel into develop-3.0
Mike Lockwood [Thu, 16 Aug 2012 20:13:20 +0000 (13:13 -0700)]
USB: gadget: f_audio_source: Fix compilation error
Change-Id: I1b785c47bda03208d396473a9d1c94631f5624d9
Signed-off-by: Mike Lockwood <lockwood@google.com>
Mike Lockwood [Thu, 16 Aug 2012 02:58:28 +0000 (19:58 -0700)]
USB: gadget: f_audio_source: Fix use after free in audio_unbind
When USB was disconnected, we were freeing our audio_dev struct in audio_unbind
before the audio system had cleaned up, resulting in a hang in audio_pcm_close.
We now statically allocate the audio_dev struct to avoid this problem.
Change-Id: I58ad21eaa20dcf4aa74ee614ef3b6ed2c91d52a1
Signed-off-by: Mike Lockwood <lockwood@google.com>
Vinicius Costa Gomes [Sat, 14 Jul 2012 21:59:25 +0000 (18:59 -0300)]
HID: uhid: Fix sending events with invalid data
This was detected because events with invalid types were arriving
to userspace.
The code before this patch would only work for the first event in the
queue (when uhid->tail is 0).
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Reviewed-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Jiri Kosina [Mon, 18 Jun 2012 15:08:08 +0000 (17:08 +0200)]
HID: uhid: silence gcc warning
gcc is giving me:
drivers/hid/uhid.c: In function ‘uhid_hid_get_raw’:
drivers/hid/uhid.c:157: warning: ‘len’ may be used uninitialized in this function
which is clearly bogus, as
- when used as memcpy() argument, it's initialized properly
- the code is structured in a way that either 'ret' or 'len'
is always initialized, so the return statement always has
an initialized value.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:28 +0000 (15:16 +0200)]
MAINTAINERS: add UHID entry
Add an UHID entry to the MAINTAINERS file.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:27 +0000 (15:16 +0200)]
HID: uhid: add example program
This adds an example user-space program that emulates a 3 button mouse
with wheel. It detects keyboard presses and moves the mouse accordingly.
It register a fake HID device to feed the raw HID reports into the kernel.
In this example, you could use uinput to get the same result, but this
shows how to get the same behavior with uhid so you don't need HID parsers
in user-space.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:26 +0000 (15:16 +0200)]
HID: uhid: add documentation
This describes the protocol used by uhid for user-space applications. It
describes the details like non-blocking I/O and readv/writev for multiple
events per syscall.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:25 +0000 (15:16 +0200)]
HID: uhid: implement feature requests
HID standard allows sending a feature request to the device which is
answered by an HID report. uhid implements this by sending a UHID_FEATURE
event to user-space which then must answer with UHID_FEATURE_ANSWER. If it
doesn't do this in a timely manner, the request is discarded silently.
We serialize the feature requests, that is, there is always only a single
active feature-request sent to user-space, other requests have to wait.
HIDP and USB-HID do it the same way.
Because we discard feature-requests silently, we must make sure to match
a response to the corresponding request. We use sequence-IDs for this so
user-space must copy the ID from the request into the answer.
Feature-answers are ignored if they do not contain the same ID as the
currently pending feature request.
Internally, we must make sure that feature-requests are synchronized with
UHID_DESTROY and close() events. We must not dead-lock when closing the
HID device, either, so we have to use separate locks.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:24 +0000 (15:16 +0200)]
HID: uhid: forward raw output reports to user-space
Some drivers that use non-standard HID features require raw output reports
sent to the device. We now forward these requests directly to user-space
so the transport-level driver can correctly send it to the device or
handle it correspondingly.
There is no way to signal back whether the transmission was successful,
moreover, there might be lots of messages coming out from the driver
flushing the output-queue. However, there is currently no driver that
causes this so we are safe. If some drivers need to transmit lots of data
this way, we need a method to synchronize this and can implement another
UHID_OUTPUT_SYNC event.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:23 +0000 (15:16 +0200)]
HID: uhid: forward output request to user-space
If the hid-driver wants to send standardized data to the device it uses a
linux input_event. We forward this to the user-space transport-level
driver so they can perform the requested action on the device.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:22 +0000 (15:16 +0200)]
HID: uhid: forward open/close events to user-space
HID core notifies us with *_open/*_close callbacks when there is an actual
user of our device. We forward these to user-space so they can react on
this. This allows user-space to skip I/O unless they receive an OPEN
event. When they receive a CLOSE event they can stop I/O again to save
energy.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:21 +0000 (15:16 +0200)]
HID: uhid: add UHID_START and UHID_STOP events
We send UHID_START and UHID_STOP events to user-space when the HID core
starts/stops the device. This notifies user-space about driver readiness
and data-I/O can start now.
This directly forwards the callbacks from hid-core to user-space.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:20 +0000 (15:16 +0200)]
HID: uhid: forward hid report-descriptor to hid core
When the uhid_hid_parse callback is called we simply forward it to
hid_parse_report() with the data that we got in the UHID_CREATE event.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:19 +0000 (15:16 +0200)]
HID: uhid: allow feeding input data into uhid devices
This adds a new event type UHID_INPUT which allows user-space to feed raw
HID reports into the HID subsystem. We copy the data into kernel memory
and directly feed it into the HID core.
There is no error handling of the events couldn't be parsed so user-space
should consider all events successfull unless read() returns an error.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:18 +0000 (15:16 +0200)]
HID: uhid: add UHID_CREATE and UHID_DESTROY events
UHID_CREATE and UHID_DESTROY are used to create and destroy a device on an
open uhid char-device. Internally, we allocate and register an HID device
with the HID core and immediately start the device. From now on events may
be received or sent to the device.
The UHID_CREATE event has a payload similar to the data used by
Bluetooth-HIDP when creating a new connection.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:17 +0000 (15:16 +0200)]
HID: uhid: implement write() on uhid devices
Similar to read() you can only write() a single event with one call to an
uhid device. To write multiple events use writev() which is supported by
uhid.
We currently always return -EOPNOTSUPP but other events will be added in
later patches.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:16 +0000 (15:16 +0200)]
HID: uhid: implement read() on uhid devices
User-space can use read() to get a single event from uhid devices. read()
does never return multiple events. This allows us to extend the event
structure and still keep backwards compatibility.
If user-space wants to get multiple events in one syscall, they should use
the readv()/writev() syscalls which are supported by uhid.
This introduces a new lock which helps us synchronizing simultaneous reads
from user-space. We also correctly return -EINVAL/-EFAULT only on errors
and retry the read() when some other thread captured the event faster than
we did.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:15 +0000 (15:16 +0200)]
HID: uhid: allow poll()'ing on uhid devices
As long as the internal buffer is not empty, we return POLLIN to
user-space.
uhid->head and uhid->tail are no atomics so the comparison may return
inexact results. However, this doesn't matter here as user-space would
need to poll() in two threads simultaneously to trigger this. And in this
case it doesn't matter if a cached result is returned or the exact new
result as user-space does not know which thread returns first from poll()
and the following read(). So it is safe to compare the values without
locking.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
David Herrmann [Sun, 10 Jun 2012 13:16:14 +0000 (15:16 +0200)]
HID: uhid: add internal message buffer
When receiving messages from the HID subsystem, we need to process them
and store them in an internal buffer so user-space can read() on the char
device to retrieve the messages.
This adds a static buffer for 32 messages to each uhid device. Each
message is dynamically allocated so the uhid_device structure does not get
too big.
uhid_queue() adds a message to the buffer. If the buffer is full, the
message is discarded. uhid_queue_event() is an helper for messages without
payload.
This also adds a public header: uhid.h. It contains the declarations for
the user-space API. It is built around "struct uhid_event" which contains
a type field which specifies the event type and each event can then add a
variable-length payload. For now, there is only a dummy event but later
patches will add new event types and payloads.
Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>