Samsung Galaxy Tab 10.1 (samsung-p4wifi)

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Samsung Galaxy Tab 10.1
Xcfe4 running on Samsung Galaxy Tab 10.1 (p4wifi)
Xcfe4 running on Samsung Galaxy Tab 10.1 (p4wifi)
Manufacturer Samsung
Name Galaxy Tab 10.1
Codename samsung-p4wifi
Released 2011
Category testing
Original software Android 3.1 Honeycomb
Hardware
Chipset Nvidia Tegra 2
CPU 2x 1.0 Ghz Cortex-A9
GPU Tegra 2
Display 1280×800
Storage 16/32 GB
Memory 1GB
Architecture armv7
Unixbench Whet/Dhry score 424.5
Features
USB Networking
Works
Flashing
Works
Touchscreen
Works
Display
Works
WiFi
Works
Xwayland
FDE
Works
Mainline
Partial
Battery
Works
3D Acceleration
Accelerometer
Works
Audio
Works
Bluetooth
Works
Camera
GPS
Mobile data
SMS
Calls
USB OTG



Contributors

  • decatf

Maintainer(s)

  • okias

Users owning this device


Introduction

postmarketOS for the Samsung Galaxy Tab 10.1 runs on mainline Linux kernel fork. The kernel uses both mainline and forward ported drivers. Some peripherals are using mainline device driver where applicable. Some peripherals which are not working on or don't have mainline drivers are using drivers forward ported from the stock 3.1.10 kernel.

How to enter flash mode

Press and hold Power + Volume Down buttons

Installation

Init pmbootstrap

$ pmbootstrap init

Choose 'samsung-p4wifi' as target device. Build the image:

$ pmbootstrap install

Enter flash (download) mode Flash the kernel and system images

$ pmbootstrap flasher flash_kernel
$ pmbootstrap flasher flash_rootfs

As alternative you can flash rootfs to Data partition to use more space, because default system partition is small

$ pmbootstrap flasher flash_rootfs --partition UDA

Battery

The battery in this device is the max17042. A tear down of the (nearly) identical Galaxy Tab 8.9 reveals that the charger is max8903.

Differences between mainline and downstream drivers:

The downstream kernel provides an early implementation of a driver for the max17042 battery. The implementation of the battery and charger driver are split across p4_battery.c and max17042_battery.c. 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 max8903 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 usb-sel 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)#Graphics which cover all Tegra 2 devices.

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 xml2ucm tool. The mixer_paths.xml and p4wifi.config.xml can be found in this github gist.

$ stack exec -- xml2ucm -m mixer_paths.xml -c p4wifi-config.xml -o examples

As of pmaports!254 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 alsamixer or set the mixer controls manually with amixer. The right channel (IN1R) is the headset microphone. The left channel (IN1L) is the built-in microphone.

Unmuting the headset microphone:

$ amixer cset name='IN1R Switch' on
$ amixer cset name='IN1R Volume' 11

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 linux-firmware) 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:

$ apk add bluez
$ rc-update add bluetooth default
$ rc-service bluetooth start

Pair a Bluetooth device:

$ bluetoothctl
$ power on
$ scan on
$ connect XX:XX:XX:XX:XX:XX
$ scan off

Audio

The following instructions will play audio to a Bluetooth headset.

Install PulseAudio:

$ apk add pulseaudio pulseaudio-bluez pulseaudio-utils

Start PulseAudio:

$ pulseaudio --daemonize

Check that the Bluetooth audio profiles are working in bluetoothctl:

$ show
Controller XX:XX:XX:XX:XX:XX (public)
        Name: BlueZ 5.49
        Alias: BlueZ 5.49
        Class: 0x000c0000
        Powered: yes
        Discoverable: no
        Pairable: yes
        UUID: Headset AG                (00001112-0000-1000-8000-00805f9b34fb)
        UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
        UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
        UUID: Audio Source              (0000110a-0000-1000-8000-00805f9b34fb)
        UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
        UUID: Headset                   (00001108-0000-1000-8000-00805f9b34fb)
        Modalias: usb:v1D6Bp0246d0531
        Discovering: no

Play an audio file through a Bluetooth headset:

$ paplay audio.wav

Accelerometer

The kxt9f accelerometer driver works pending device tree patches being merged into upstream. There requires a user space daemon such as iio-sensor-proxy to read the sensor data.

USB OTG

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


Other Information

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.

Peripheral Type Hardware Mainline Driver
Status
Accelerometer kxtf91
Ambient light sensor bh1721fvc Y
Analog Digital Converter stmpe811 Y
Audio wm8994 Y
Battery max17042 Y
Camera s5k5ccgx (front)
s5k6bbgx (back)
-
Charger max8903 Y
Compass ak8975c2
CPU Temperature Sensor nct1008 Y
Display Panel cmc623 P
GPS bcm4751 P
GPU tegra host1x Y
Gyroscope mpu3050 Y
HDMI Connector sii92343
Touch Digitizer mxt1386 Y
Vibration Motor isa1200 P
Voltage Regulators tps6586x Y
Wifi / Bluetooth bcm4330 Y
3G Modem xmm6260 -
3.5mm Jack sec_jack P
30-pin accessory port unknown -

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.


Mainline Driver Status Legend
Code Meaning
Y Mainline driver
P Forward ported driver
- No driver -- driver has not been forward ported
latest mainline driver ?

latest kernel (based on grate-linux) with rebase patches to test (do not posses the HW) https://github.com/okias/linux/pull/new/p4wifi . Config file: https://raw.githubusercontent.com/Decatf/linux/040d3332474fceceaf4e4402417f0ead732f45bc/arch/arm/configs/tegra_postmarketos_defconfig

If it'll work for you, please let me know on Matrix (okias) or here.

See also