The percpu_rw_semaphore is not currently freed, and this leads to
a crash when the stale rcu callback is invoked. DEBUG_OBJECTS
detects this.
ODEBUG: free active (active state 1) object type: rcu_head hint: (null)
------------[ cut here ]------------
WARNING: CPU: 1 PID: 2024 at debug_print_object+0xac/0xc8
PC is at debug_print_object+0xac/0xc8
LR is at debug_print_object+0xac/0xc8
Call trace:
[<ffffff80082e2c2c>] debug_print_object+0xac/0xc8
[<ffffff80082e40b0>] debug_check_no_obj_freed+0x1e8/0x228
[<ffffff8008191254>] kfree+0x1cc/0x250
[<ffffff80083cc03c>] hci_uart_tty_close+0x54/0x108
[<ffffff800832e118>] tty_ldisc_close.isra.1+0x40/0x58
[<ffffff800832e14c>] tty_ldisc_kill+0x1c/0x40
[<ffffff800832e3dc>] tty_ldisc_release+0x94/0x170
[<ffffff8008325554>] tty_release_struct+0x1c/0x58
[<ffffff8008326400>] tty_release+0x3b0/0x490
[<ffffff80081a3fe8>] __fput+0x88/0x1d0
[<ffffff80081a418c>] ____fput+0xc/0x18
[<ffffff80080c0624>] task_work_run+0x9c/0xc0
[<ffffff80080a9e24>] do_exit+0x24c/0x8a0
[<ffffff80080aa4e0>] do_group_exit+0x38/0xa0
[<ffffff80080aa558>] __wake_up_parent+0x0/0x28
[<ffffff8008082c00>] el0_svc_naked+0x34/0x38
---[ end trace bfe08cbd89098cdf ]---
Signed-off-by: Hermes Zhang <chenhuiz@axis.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
In case memory resources for *fw* were allocated, release them before
return.
Addresses-Coverity-ID: 1472611 ("Resource leak")
Fixes: 7237c4c9ec ("Bluetooth: mediatek: Add protocol support for MediaTek serial devices")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
At the moment we only support ACPI enumeration for serial port attached
RTL bluetooth controllers.
This commit adds a dependency on ACPI to the BT_HCIUART_RTL configuration
option, fixing the following warning when ACPI is not enabled:
drivers/bluetooth/hci_h5.c:920:22: warning: 'rtl_vnd' defined but not used
Cc: Arnd Bergmann <arnd@arndb.de>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
We're supposed to pass the number of elements in the mtk_recv_pkts, not
the number of bytes.
Fixes: 7237c4c9ec ("Bluetooth: mediatek: Add protocol support for MediaTek serial devices")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Like all the other UART protocols, introduce a configuration option for
Realtek based serial devices.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This adds a driver based on serdev driver for the MediaTek serial protocol
based on running H:4, which can enable the built-in Bluetooth device inside
MT7622 SoC.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Using HCI_VENDOR_PKT for vendor specific events does work since it has
also the value 0xff, but it is actually the packet type indicator
constant and not the event constant. So introduce HCI_EV_VENDOR and
use it.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This driver was recently updated to use serdev, so add the appropriate
dependency. Without this one can get compiler warnings like this if
CONFIG_SERIAL_DEV_BUS is not enabled:
CC [M] drivers/bluetooth/hci_h5.o
drivers/bluetooth/hci_h5.c:934:36: warning: ‘h5_serdev_driver’ defined but not used [-Wunused-variable]
static struct serdev_device_driver h5_serdev_driver = {
^~~~~~~~~~~~~~~~
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Add support to set voltage/current of various regulators
to power up/down Bluetooth chip wcn3990.
Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
In function qca_setup, we set initial and operating speeds for Qualcomm
Bluetooth SoC's. This block of code is common across different
Qualcomm Bluetooth SoC's. Instead of duplicating the code, created
a wrapper function to set the speeds. So that future coming SoC's
can use these wrapper functions to set speeds.
Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Redefinition of qca_uart_setup will help future Qualcomm Bluetooth
SoC, to use the same function instead of duplicating the function.
Added new arguments soc_type and soc_ver to the functions.
These arguments will help to decide type of firmware files
to be loaded into Bluetooth chip.
soc_type holds the Bluetooth chip connected to APPS processor.
soc_ver holds the Bluetooth chip version.
Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Some of the QCA BTSoC ROME functions, are used for different versions
or different make of BTSoC's. Instead of duplicating the same functions
for new chip, update names of the functions that are used for both
chips to keep this generic and would help in future when we would have
new BT SoC. To have generic text in logs updated from ROME to QCA where
ever possible. This avoids confusion to user, when using the future
Qualcomm Bluetooth SoC's. Updated BT_DBG, BT_ERR and BT_INFO with
bt_dev_dbg, bt_dev_err and bt_dev_info where ever applicable.
Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Add support for the enable and device-wake GPIOs used on ACPI enumerated
RTL8723BS devices.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Implement support for the RTL8723BS chip.
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
[hdegoede@redhat.com: Port from bt3wire.c to hci_h5.c, drop broken GPIO code]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Allow vendor-specific setup, open, and close functions to be defined.
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
[hdegoede@redhat.com: Port from bt3wire.c to hci_h5.c, drop dt support]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Add basic support for serdev enumerated devices, note sine this does
not (yet) declare any of / ACPI ids to bind to atm this is a nop.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The contents of the rtl_bt/rtlXXXX_config.bin file may be board specific
allow the caller of btrtl_initialize to specify a postfix identifying
the board, which if specified will make btrtl_initialize look for
rtl_bt/rtlXXXX_config-<postfix>.bin instead.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The Realtek RTL8723BS and RTL8723DS chipsets are SDIO wifi chips. They
also contain a Bluetooth module which is connected via UART to the host.
Realtek's userspace initialization tool (rtk_hciattach) differentiates
these two via the HCI version and revision returned by the
HCI_OP_READ_LOCAL_VERSION command.
Additionally we apply these checks only the for UART devices. Everything
else is assumed to be a "RTL8723B" which was originally supported by the
driver (communicating via USB).
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The UART settings are embedded in the config blob. This has to be parsed
to successfully initialize the Bluetooth part of the RTL8723BS (which is
an SDIO chip, but the Bluetooth part is connected via UART).
The Realtek "rtl8723bs_bt" and "rtl8723ds_bt" userspace Bluetooth UART
initialization tools (rtk_hciattach) use the following sequence:
- send H5 sync pattern (already supported by hci_h5)
- get LMP version (already supported by btrtl)
- get ROM version (already supported by btrtl)
- load the firmware and config for the current chipset (already
supported by btrtl)
- read UART settings from the config blob (part of this patch)
- send UART settings via a vendor command to the device (which changes
the baudrate of the device and enables or disables flow control
depending on the config)
- change the baudrate and flow control settings on the host
- send the firmware and config blob to the device (already supported by
btrtl)
Sending the last firmware and config blob download command
(rtl_download_cmd) fails if the UART settings are not updated
beforehand. This is presumably because the device applies the config
right after the firmware and config blob download - which means that at
this point the host is using different UART settings than the device
(which will obviously result in non-working communication).
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Consistently use rtl_dev_err and rtl_dev_info everywhere for messages.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This prepares the btrtl code so it can be used to initialize Bluetooth
modules connected via UART (these are found for example on the RTL8723BS
and RTL8723DS SDIO chips, which come with an embedded UART Bluetooth
module).
The Realtek "rtl8723bs_bt" and "rtl8723ds_bt" userspace Bluetooth UART
initialization tools (rtk_hciattach) use the following sequence:
1) send H5 sync pattern (already supported by hci_h5)
2) get LMP version (already supported by btrtl)
3) get ROM version (already supported by btrtl)
4) load the firmware and config for the current chipset (already
supported by btrtl)
5) read UART settings from the config blob (currently not supported)
6) send UART settings via a vendor command to the device (which changes
the baudrate of the device and enables or disables flow control
depending on the config)
7) change the baudrate and flow control settings on the host
8) send the firmware and config blob to the device (already supported by
btrtl)
The main reason why the initialization has to be split is step #7. This
requires changes to the underlying "bus", which should be kept outside
of the "generic" btrtl driver.
The idea for this split is borrowed from the btbcm driver but adjusted
where needed (the btrtl driver for example needs two blobs: firmware and
config, while the btbcm only needs one).
This also prepares the code for step #5 (parsing the config blob) by
centralizing the code which loads the firmware and config blobs and
storing the result in the new struct btrtl_device_info.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This makes the firmware names show up in modinfo.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Replace the BT_ERR functions with bt_dev_err to get a consistent error
printout that always prefixes the HCI device identifier.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Issue description: Intel 7265 shares the same RF with Wifi and BT.
In the shutdown scenario turn off BT, followed by turn WiFi off
and on causing error in RF calibration in WiFi Module
Solution: before shutdown BT ensure any RF activity to clear by
HCI reset command.
Reference Logs:
ERR kernel: [ 386.193284] iwlwifi 0000:01:00.0: Failed to run INIT calibrations: -5
ERR kernel: [ 386.193298] iwlwifi 0000:01:00.0: Failed to run INIT ucode: -5
ERR kernel: [ 386.193309] iwlwifi 0000:01:00.0: Failed to start RT ucode: -5
Signed-off-by: Amit K Bag <amit.k.bag@intel.com>
Singed-off-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
qca_open() and qca_set_baudrate() are never called in atomic context.
They call kzalloc() and bt_skb_alloc() with GFP_ATOMIC,
which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
inject_cmd_complete() is only called by intel_dequeue(),
which is never called in atomic context.
inject_cmd_complete() calls bt_skb_alloc() with GFP_ATOMIC,
which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
inject_cmd_complete() is only called by btusb_send_frame_intel(),
which is set to hdev->send, and hdev->send() is never
called in atomic context.
inject_cmd_complete() calls bt_skb_alloc() with GFP_ATOMIC,
which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
btmrvl_sdio_card_to_host() is never called in atomic context.
It calls bt_skb_alloc() with GFP_ATOMIC, which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
bpa10x_send_frame() is only set to hdev->send, and hdev->send() is never
called in atomic context.
bpa10x_send_frame() calls usb_alloc_urb(), kmalloc() and usb_submit_urb()
with GFP_ATOMIC, which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
bluecard_hci_set_baud_rate() is never called in atomic context.
bluecard_hci_set_baud_rate() is only by bluecard_hci_open(), which is
set to hdev->open, and hdev->open() is never called in atomic context.
bluecard_hci_set_baud_rate() calls bt_skb_alloc() with GFP_ATOMIC,
which is not necessary. GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
bfusb_send_frame() is only set to hdev->send, and hdev->send() is never
called in atomic context.
bfusb_send_frame() calls bt_skb_alloc() with GFP_ATOMIC, which is not
necessary. GFP_ATOMIC can be replaced with GFP_KERNEL.
This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The USB completion callback does not disable interrupts while acquiring
the ->lock. We want to remove the local_irq_disable() invocation from
__usb_hcd_giveback_urb() and therefore it is required for the callback
handler to disable the interrupts while acquiring the lock.
The callback may be invoked either in IRQ or BH context depending on the
USB host controller.
Use the _irqsave variant of the locking primitives.
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: linux-bluetooth@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This breaks the build as this header is not meant to be used in this
way.
./include/linux/unaligned/access_ok.h:8:28: error: redefinition of ‘get_unaligned_le16’
static __always_inline u16 get_unaligned_le16(const void *p)
^~~~~~~~~~~~~~~~~~
In file included from drivers/bluetooth/hci_nokia.c:32:
./include/linux/unaligned/le_struct.h:7:19: note: previous definition of ‘get_unaligned_le16’ was here
static inline u16 get_unaligned_le16(const void *p)
Use asm/unaligned.h instead.
Signed-off-by: David S. Miller <davem@davemloft.net>
Init hci_uart->init_ready so that hci_uart_init_ready() works properly.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Make hci_uart_register_device() and hci_uart_unregister_device() call
serdev_device_close()/open() themselves instead of relying on the various
hci_uart drivers to do this for them.
Besides reducing code complexity, this also ensures correct error checking
of serdev_device_open(), which was missing in a few drivers.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
For reasons explained in detail in commit 3611f4d2a5 ("hci_ldisc:
fix null pointer deref") the hci_uart_close() functions sets
hci_dev->flush to NULL.
But the device may be re-opened after a close, this commit restores the
hci_dev->flush callback on open().
Note this commit also moves the nearly empty defition of hci_uart_open()
a bit down in the file to avoid the need for forward declaring
hci_uart_flush().
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Re-use kstrtol_from_user() instead of open coded variant.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This patch fixes the following warning during boot:
do not call blocking ops when !TASK_RUNNING; state=1 set at
[<(ptrval)>] qca_setup+0x194/0x750 [hci_uart]
WARNING: CPU: 2 PID: 1878 at kernel/sched/core.c:6135
__might_sleep+0x7c/0x88
In qca_set_baudrate(), the current task state is set to
TASK_UNINTERRUPTIBLE before going to sleep for 300ms. It was then
restored to TASK_INTERRUPTIBLE. This patch sets the current task state
back to TASK_RUNNING instead.
Signed-off-by: Thierry Escande <thierry.escande@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
The Dell Inspiron 5565 uses a QCA Rome chip which needs to be reset
(and have its firmware reloaded) for bluetooth to work after
suspend/resume.
BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=15750392
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
checkpatch.pl shows a warning for these unnecessary curly braces.
so just removed those curly braces.
Signed-off-by: Vaibhav Murkute <vaibhavmurkute88@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Since commit 3c47d19ff4 ("drivers: base: add coredump driver ops")
it is possible to initiate a device coredump from user-space. This
patch adds support for it in btmrvl_sdio adding the .coredump()
driver callback. This makes dump through debugfs obsolete so removing
it.
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
In commit f44cb4b19e ("Bluetooth: btusb: Fix quirk for Atheros
1525/QCA6174") we tried to address the non-working Atheros BT devices
by changing the quirk from BTUSB_ATH3012 to BTUSB_QCA_ROME. This made
such devices working while it turned out to break other existing chips
with the very same USB ID, hence it was reverted afterwards.
This is another attempt to tackle the issue. The essential point to
use BTUSB_QCA_ROME is to apply the btusb_setup_qca() and do RAM-
patching. And the previous attempt failed because btusb_setup_qca()
returns -ENODEV if the ROM version doesn't match with the expected
ones. For some devices that have already the "correct" ROM versions,
we may just skip the setup procedure and continue the rest.
So, the first fix we'll need is to add a check of the ROM version in
the function to skip the setup if the ROM version looks already sane,
so that it can be applied for all ath devices.
However, the world is a bit more complex than that simple solution.
Since BTUSB_ATH3012 quirk checks the bcdDevice and bails out when it's
0x0001 at the beginning of probing, so the device probe always aborts
here.
In this patch, we add another check of ROM version again, and if the
device needs patching, the probe continues. For that, a slight
refactoring of btusb_qca_send_vendor_req() was required so that the
probe function can pass usb_device pointer directly before allocating
hci_dev stuff.
Fixes: commit f44cb4b19e ("Bluetooth: btusb: Fix quirk for Atheros 1525/QCA6174")
Bugzilla: http://bugzilla.opensuse.org/show_bug.cgi?id=1082504
Tested-by: Ivan Levshin <ivan.levshin@microfocus.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This patch adds rampatch download compatibility for ROME >= 3.2.
Starting with ROME 3.2, the 'download mode' field of the rampatch
header indicates if the controller acknowledges (or not) the received
rampatch segments. If not, we need to send all the segments without
expecting any event from the controller (except for the last segment).
Goal is (I assume) to speed-up rampatch download.
This fixes BT on Dragonboard-600c P2 which includes the following BT
controller:
hci0: ROME Patch Version Request
hci0: Product:0x00000008
hci0: Patch :0x00000111
hci0: ROM :0x00000302
hci0: SOC :0x00000023
Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
When both CONFIG_BT_HCIUART_INTEL and CONFIG_BT_HCIUART_BCM are not
selected, sparse complains like this:
drivers/bluetooth/hci_ldisc.c:437:9: warning: switch with no cases
Fix the sparse warning by proving a default switch case.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Hermes Zhang