Samsung Galaxy Tab 10.1 (samsung-p4wifi)

Maintainer(s)

 * None

How to enter flash mode
Press and hold +  buttons until you see the "Downloading" screen. Confirm that you want to enter the mode by pressing the button twice.

Installation
Init pmbootstrap Choose 'samsung' as the vendor and 'p4wifi' as target device. Build the image: Enter flash (download) mode Flash the kernel and system images

As alternative you can flash rootfs to Data partition to use more space, because default system partition is small If these two commands fail

Battery
The battery in this device is the. A tear down of the (nearly) identical Galaxy Tab 8.9 reveals that the charger is.

Differences between mainline and downstream drivers:

The downstream kernel provides an early implementation of a driver for the  battery. The implementation of the battery and charger driver are split across  and. The downstream charger driver implements additional logic to handle charge full and low battery events which may affect the health of the battery. The implementation details are not clear but the overall functionality appears to dynamically tune the full charge value. The mainline driver does not have this sort of functionality. The downstream driver reports the current in milliamp whereas the mainline driver is in microamp.

The  datasheet shows that there are separate GPIOs for USB and DC power connectors. This device has one connect GPIO for both USB and DC mode. The type of connector is determined by reading the  GPIOs. It's unclear which piece of hardware the usb-sel is coming from (max8903 / tegra soc / 30-pin connector ???).

Graphics
Moved to Nvidia_Tegra_2_(tegra20) which cover all Tegra 2 devices.

It looks like there is an important issue, see latest comments on this issue page.

Audio
Audio output through headphone and speakers are working. Audio input through the built-in microphone and headset microphone are working.

The ALSA UCM config files were previously generated using the  tool. The  and   can be found in this github gist.

As of the ALSA UCM config files were created based the wm8994 datasheet and the downstream driver coding of the mixer.

The audio inputs are muted by default. Unmute and set the volume with  or set the mixer controls manually with. The right channel is the headset microphone. The left channel is the built-in microphone.

Unmuting the headset microphone:

Note: Plug in the headset mic at boot otherwise the sound driver will not load. Some wm8994 device register writes fail during driver probe unless mic bias GPIO is set to high.

Wifi
The wifi chip in this device is the Broadcom BCM4330 B1 revision. There is a B2 revision which is much more common. The only distinguishing factor is the firmware. Only the B1 firmware will work on this device. The most common BCM4330 firmware found from various sources (such as ) is for the B2 revision.

Cellular Modem
The xmm6260 modem was used in quite a few Samsung Android devices from the same era as this tablet. The Samsung Galaxy Tab 10.1 3G (p4) and Samsung Galaxy Tab 10.1 from T-Mobile (p4tmo) are otherwise identical to the WiFi only version of the tablet (p4wifi). The cellular modem is connected via an internal USB interface called USB HSIC. The mainline Tegra USB driver does not implement this functionality. Much of the work in enabling the cellular stack would involve adding USB HSIC support to the mainline USB driver.

Bluetooth
The bcm4330 Bluetooth module is supported by the mainline kernel and Bluez 5 stack.

Install bluetooth service:

Pair a Bluetooth device:

Audio
The following instructions will play audio to a Bluetooth headset.

Install PulseAudio:

Start PulseAudio:

Check that the Bluetooth audio profiles are working in bluetoothctl:

Play an audio file through a Bluetooth headset:

Accelerometer
The  accelerometer driver works pending device tree patches being merged into upstream. There requires a user space daemon such as  to read the sensor data.

USB OTG
USB OTG mode is not implemented in the mainline USB driver.

Hardware Information & Mainline Driver Status
The Linux mainlining effort contains drivers forward ported from the stock Samsung Linux 3.1.10 kernel which shipped with the device. Some peripheral devices have been transitioned over to the mainline driver. Other drivers are not in the mainline kernel or the device is not compatible with the mainline driver.

Notes:


 * 1: kxt9f driver exists in mainline. The driver needs support device tree bindings.


 * 2: ak8975 driver exists in mainline. The device id for ak8975c needs to be added to the driver. I (decatf) can't test it because the compass seems to report nonsense data. The compass on my tablet might be broken.


 * 3: sii9234 driver exists in mainline. Requires someone with an MHL cable to implement / test it.

Latest mainline (just few patches diverged from upstream)
latest kernel from grate-linux - https://github.com/grate-driver/linux/