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Line 29: Line 29:
 
== 内核配置 ==
 
== 内核配置 ==
  
The latest kernel configuration can be found at https://svn.openmoko.org/trunk/oe/packages/linux/linux-gta01/defconfig-fic-gta01. Just copy it to the linux-2.6.x/.config file.
+
最新的内核配置文件可以从[https://svn.openmoko.org/trunk/oe/packages/linux/linux-gta01/defconfig-fic-gta01 https://svn.openmoko.org/trunk/oe/packages/linux/linux-gta01/defconfig-fic-gta01]下载。将它复制到linux-2.6.x/目录下并保存为.config文件。
  
 
== 内核构建 ==
 
== 内核构建 ==

Revision as of 04:45, 19 May 2008

Contents

概述

GTA01上所使用的内核基于来自kernel.org未经修改的Linux 2.6.21.3内核。

针对如下设备还需要一些额外的补丁

  • S3C2410 Usb设备控制器
    • 我们使用来自iPaq H1940 linux项目的驱动程序
  • S3C2410 SD卡控制器
  • QT2410支持
    • This is just some glue that puts all pieces together
  • S3C2410触摸屏驱动程序
    • 来自iPaq H1940 linux项目
  • GTA01支持
    • Some glue/configuration to pull all pieces together
  • GSM Communication Infrastructure
    • The kernel-level part (TS07.10 line discipline, GPRS line discipline)

内核补丁

针对上述未经修改的内核的补丁集可以从https://svn.openmoko.org/trunk/src/target/kernel/patches/下载,这是一个 "quilt patchset"。你必须把它解压到"linux-2.6.x"目录的"patches"文件夹,然后使用"quilt push -a"命令,这个命令将把所有的补丁打到内核里。

例如,解压2.6.21.1内核tarball,然后使用如下命令来把最新的补丁打到内核里:

   cd linux-2.6.21.1
   svn co https://svn.openmoko.org/trunk/src/target/kernel/patches
   quilt push -a

注意2.6.21.1 may not be the correct kernel to build against - see previous section to determine just which kernel version to download and patch.

内核配置

最新的内核配置文件可以从https://svn.openmoko.org/trunk/oe/packages/linux/linux-gta01/defconfig-fic-gta01下载。将它复制到linux-2.6.x/目录下并保存为.config文件。

内核构建

The kernel build is executed as normal. We actually only need the "vmlinux" target, not the "zImage".

可引导的内核映像

A bootable kernel image called uImage is available from [1]

创建一个可引导的内核映像

u-boot要求所有的映像文件以uImage格式进行封装(比如内核,initrd,...)。This is basically just a special header adding CRC protection, version information, etc. Pleaes see u-boot for details.

内核启动参数

Since the QT2410 can be used with different liquid crystal modules (LCMs), the kernel images for the QT2410 have a boot parameter "tft":

  • If you boot without any tft= parameter, the 'stock' qt2410 240x320 TFT panel is assumed.
  • If you boot with "tft=b" ('b' for big), the timings for the SHARP 8" 640x480 TFT panel are used.
  • If you boot with "tft=p" ('p' for production), the timings for the 2.8" 480x640 TFT panel are used.

内核子系统

In this section we will outline a couple of the GTA01 specific kernel drivers / features / subsystems

GSM

Power Management

The gta01_pm_gsm driver implements GSM power management (this means, if this is compiled as a module, you have to load the gta01_pm_gsm.ko module first)

It exports the following sysfs based interface

root@fic-gta01:/$ ls -l /sys/bus/platform/devices/gta01-pm-gsm.0/
-rw-r--r--    1 root     root         4096 Feb  1 09:58 download
-rw-r--r--    1 root     root         4096 Feb  1 09:58 power_on
-rw-r--r--    1 root     root         4096 Feb  1 09:58 reset
powering up
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/power_on 
gta01-pm-gsm gta01-pm-gsm.0: powering up GSM, thus disconnecting serial console
Powering down
root@fic-gta01:~$ echo "0" > /sys/bus/platform/devices/gta01-pm-gsm.0/power_on 
gta01-pm-gsm gta01-pm-gsm.0: powered down GSM, thus enabling serial console
复位
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/reset 
root@fic-gta01:~$ echo "0" > /sys/bus/platform/devices/gta01-pm-gsm.0/reset 
Activating GSM baseband download mode
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/download
De-activating GSM baseband download mode
root@fic-gta01:~$ echo "0" > /sys/bus/platform/devices/gta01-pm-gsm.0/download

GPS

Power Management

The gta01_pm_gps kernel driver offers a sysfs based interface:

root@fic-gta01:~$ ls -l /sys/bus/platform/devices/gta01-pm-gps.0/     
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_avdd_3v
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_lp_io_3v3
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_pll_core_2v5
-rw-r--r--    1 root     root            0 Feb  1 09:14 power_sequence
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_vtxco_2v8
-rw-r--r--    1 root     root         4096 Feb  1 09:14 pwron
-rw-r--r--    1 root     root         4096 Feb  1 09:14 reset

The power_avdd_3v, power_lp_io_3v3, power_pll_core_2v5, power_vtxco_2v8, pwron and reset files represent the state of the respective signal.

The power_sequence file implements power-up/power-down sequence in accordance with the GlobalLocate data sheet.

Powering up
root@fic-gta01:~$ echo "power_up" > /sys/bus/platform/devices/gta01-pm-gps.0/power_sequence 
Powering down
root@fic-gta01:~$ echo "power_down" > /sys/bus/platform/devices/gta01-pm-gps.0/power_sequence

Asound driver

High-level requirements

The GTA01 audio subsystem is fairly complex, even though the high-level requirements for the sound driver are simple. The features we need to support

  • voice call support
    • passing through the microphone signal to the GSM Modem
    • passing through the GSM Modem audio output to the integrated speaker(s)
    • the microphone input mixer gain will be statically configured according to the dynamic requirements
    • the audio volume that is sent to the GSM modem can be adjusted via line out level
    • the audio volume incoming (from GSM modem -> codec) can be adjusted via speaker out level
  • voice call recording support
    • the user is able to record phone conversations on digital storage inside the phone. Format will be ogg (not important to driver)
    • ideally, the user can choose between recording only incoming or outgoing signal, or both.
    • for both, we'd need to mix both microphone and line-in signals before recording. is this possible?
  • voice call playback support
    • the user is able to playback recorded files during a conversation. this means that PCM playback needs to be mixed with mic input before being passed to line-out (and to the GSM modem)
  • media playback support
    • an audio player can play back mp3/ogg/flac/... files and output sound via integrated speakers or headphone
  • headphone jack switch
    • this is connected to a GPIO of the S3C2410. How to best integrate this with the sound driver? It should just be handled like any other headphone jack reporting of e.g. laptop computers.

For more details see Neo1973 Audio Subsystem

蓝牙

We're using the stock bluez implementation of the linux kernel.

Power Management

The bluetooth basically has the following preconditions

  • BT_EN being set
  • The Voltage regulator set up properly
  • The ohci-hcd driver being loaded

The gta01_pm_bt driver implements the following files:

root@fic-gta01:/$ ls -l /sys/devices/platform/gta01-pm-bt.0
-rw-r--r--    1 root     root         4096 Feb  1 09:52 power_on
-rw-r--r--    1 root     root         4096 Feb  1 09:52 reset
Powering up the device
root@fic-gta01:/$ echo "1" >  /sys/devices/platform/gta01-pm-bt.0/power_on  
usb 1-1: new full speed USB device using s3c2410-ohci and address 4
usb 1-1: configuration #1 chosen from 1 choice
Powering down the device
root@fic-gta01:/$ echo "0" >  /sys/devices/platform/gta01-pm-bt.0/power_on 
usb 1-1: USB disconnect, address 3
Asserting reset (low-active)
root@fic-gta01:/$ echo "0" >  /sys/devices/platform/gta01-pm-bt.0/reset 
root@fic-gta01:/$ usb 1-1: USB disconnect, address 2
De-asserting reset (low-active)
root@fic-gta01:/$ echo "1" >  /sys/devices/platform/gta01-pm-bt.0/reset 
s3c2410-ohci s3c2410-ohci: wakeup
usb 1-1: new full speed USB device using s3c2410-ohci and address 3
usb 1-1: configuration #1 chosen from 1 choice

Getting started

root@fic-gta01:~$ hciconfig hci0 up
root@fic-gta01:~$ hcitool  scan
Scanning ...
        00:14:9A:77:A2:02       A780
root@fic-gta01:~$ hcitool inq 00:14:9A:77:A2:02 
Inquiring ...
        00:14:9A:77:A2:02       clock offset: 0x55df    class: 0x502204
root@fic-gta01:~$ hcitool cc 00:14:9A:77:A2:02 
root@fic-gta01:~$ hcitool con                 
Connections:
        < ACL 00:14:9A:77:A2:02 handle 42 state 1 lm MASTER 
root@fic-gta01:~$ hcitool info 00:14:9A:77:A2:02
Requesting information ...
        BD Address:  00:14:9A:77:A2:02
        Device Name: A780
        LMP Version: 1.1 (0x1) LMP Subversion: 0x700
        Manufacturer: Broadcom Corporation (15)
        Features: 0xff 0xff 0x0d 0x00 0x00 0x00 0x00 0x00
                <3-slot packets> <5-slot packets> <encryption> <slot offset> 
                <timing accuracy> <role switch> <hold mode> <sniff mode> 
                <park state> <RSSI> <channel quality> <SCO link> <HV2 packets> 
                <HV3 packets> <u-law log> <A-law log> <CVSD> <power control> 
                <transparent SCO> 

AUX Button

The AUX button (formerly 911 button) is supported via the "gta01kbd" driver in the kernel (drivers/input/keyboard/gta01kbd.c).

It creates an input event device that only issues "KEY_PHONE" press/unpress events.

Power Management Unit (PMU)

The PMU is supported via the "pcf50606" driver in the kernel (drivers/i2c/chips/pcf50606.c).

This driver provides a number of userspace interfaces for the various bits and pieces of the PMU

Power Button, Charger insertion

The PMU creates an input device that supports the following keys:

  • KEY_POWER: power button of GTA01
  • KEY_POWER2: USB power supply insert/remove
  • KEY_BATTERY: Charger insert/remove

实时时钟

The real-time clock, including the alarm feature, is implemented as standard RTC (/dev/rtc).

看门狗

The PMU-integrated watchdog is implemented using the standard watchdog character device.

Voltage Regulators

The voltage regulators are exported to userspace using sysfs, much like lm_sensors.

Every regulator can be read (and written!). The format is ASCII in millivolts.

root@fic-gta01:/sys/devices/platform/s3c2410-i2c/i2c-0/0-0008$ ls -l /sys/bus/i2c/devices/0-0008/voltage_*
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_d1reg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_d2reg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_d3reg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_dcd
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_dcde
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_dcud
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_lpreg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_ioreg
root@fic-gta01:/sys/devices/platform/s3c2410-i2c/i2c-0/0-0008$ cat voltage_dcd
1300

Battery Voltage

The battery voltage (in millivolts) can be read via sysfs

root@fic-gta01:~$ cat /sys/bus/i2c/devices/0-0008/battvolt 
3767

Battery charging current

The battery charging current (in milliamperes) can be read via sysfs

root@fic-gta01:~$ cat /sys/bus/i2c/devices/0-0008/chgcur 
0

电池温度

The battery temperature (in centigrades) can be read via sysfs

root@fic-gta01:~$ cat /sys/bus/i2c/devices/0-0008/battemp
25

内核TODO列表

Various

  • speed up in-kernel boot process
    • delay calibration
    • framebuffer takes ages

TS07.10 multiplex

PCF50606

  • fix conversion problems when setting alarm time/date
  • check conversion table for temperature
  • implement 'persistent alarm setting' (see mail from mickey)

Backlight

  • later: implement smooth fade-in, fade-out

Vibrator

  • implement it as LED driver
  • test it
  • later: implement PWM

USB设备驱动

  • test switching between usb host and usb device

Power Management

  • test, debug and fix suspend on user request
  • test, debug and fix wakeup on
    • IRQ on serial UART (GSM)
    • IRQ on serial UART (GPS)
    • IRQ from PMU (charger insert/remove or the like)
    • IRQ from ADC/touchscreen
    • 911 button press (GPIO IRQ)
    • headphone jack insert/remove
Personal tools

概述

GTA01上所使用的内核基于来自kernel.org未经修改的Linux 2.6.21.3内核。

针对如下设备还需要一些额外的补丁

  • S3C2410 Usb设备控制器
    • 我们使用来自iPaq H1940 linux项目的驱动程序
  • S3C2410 SD卡控制器
  • QT2410支持
    • This is just some glue that puts all pieces together
  • S3C2410触摸屏驱动程序
    • 来自iPaq H1940 linux项目
  • GTA01支持
    • Some glue/configuration to pull all pieces together
  • GSM Communication Infrastructure
    • The kernel-level part (TS07.10 line discipline, GPRS line discipline)

内核补丁

针对上述未经修改的内核的补丁集可以从https://svn.openmoko.org/trunk/src/target/kernel/patches/下载,这是一个 "quilt patchset"。你必须把它解压到"linux-2.6.x"目录的"patches"文件夹,然后使用"quilt push -a"命令,这个命令将把所有的补丁打到内核里。

例如,解压2.6.21.1内核tarball,然后使用如下命令来把最新的补丁打到内核里:

   cd linux-2.6.21.1
   svn co https://svn.openmoko.org/trunk/src/target/kernel/patches
   quilt push -a

注意2.6.21.1 may not be the correct kernel to build against - see previous section to determine just which kernel version to download and patch.

内核配置

The latest kernel configuration can be found at https://svn.openmoko.org/trunk/oe/packages/linux/linux-gta01/defconfig-fic-gta01. Just copy it to the linux-2.6.x/.config file.

内核构建

The kernel build is executed as normal. We actually only need the "vmlinux" target, not the "zImage".

可引导的内核映像

A bootable kernel image called uImage is available from [1]

创建一个可引导的内核映像

u-boot要求所有的映像文件以uImage格式进行封装(比如内核,initrd,...)。This is basically just a special header adding CRC protection, version information, etc. Pleaes see u-boot for details.

内核启动参数

Since the QT2410 can be used with different liquid crystal modules (LCMs), the kernel images for the QT2410 have a boot parameter "tft":

  • If you boot without any tft= parameter, the 'stock' qt2410 240x320 TFT panel is assumed.
  • If you boot with "tft=b" ('b' for big), the timings for the SHARP 8" 640x480 TFT panel are used.
  • If you boot with "tft=p" ('p' for production), the timings for the 2.8" 480x640 TFT panel are used.

内核子系统

In this section we will outline a couple of the GTA01 specific kernel drivers / features / subsystems

GSM

Power Management

The gta01_pm_gsm driver implements GSM power management (this means, if this is compiled as a module, you have to load the gta01_pm_gsm.ko module first)

It exports the following sysfs based interface

root@fic-gta01:/$ ls -l /sys/bus/platform/devices/gta01-pm-gsm.0/
-rw-r--r--    1 root     root         4096 Feb  1 09:58 download
-rw-r--r--    1 root     root         4096 Feb  1 09:58 power_on
-rw-r--r--    1 root     root         4096 Feb  1 09:58 reset
powering up
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/power_on 
gta01-pm-gsm gta01-pm-gsm.0: powering up GSM, thus disconnecting serial console
Powering down
root@fic-gta01:~$ echo "0" > /sys/bus/platform/devices/gta01-pm-gsm.0/power_on 
gta01-pm-gsm gta01-pm-gsm.0: powered down GSM, thus enabling serial console
复位
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/reset 
root@fic-gta01:~$ echo "0" > /sys/bus/platform/devices/gta01-pm-gsm.0/reset 
Activating GSM baseband download mode
root@fic-gta01:~$ echo "1" > /sys/bus/platform/devices/gta01-pm-gsm.0/download
De-activating GSM baseband download mode
root@fic-gta01:~$ echo "0" > /sys/bus/platform/devices/gta01-pm-gsm.0/download

GPS

Power Management

The gta01_pm_gps kernel driver offers a sysfs based interface:

root@fic-gta01:~$ ls -l /sys/bus/platform/devices/gta01-pm-gps.0/     
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_avdd_3v
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_lp_io_3v3
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_pll_core_2v5
-rw-r--r--    1 root     root            0 Feb  1 09:14 power_sequence
-rw-r--r--    1 root     root         4096 Feb  1 09:14 power_vtxco_2v8
-rw-r--r--    1 root     root         4096 Feb  1 09:14 pwron
-rw-r--r--    1 root     root         4096 Feb  1 09:14 reset

The power_avdd_3v, power_lp_io_3v3, power_pll_core_2v5, power_vtxco_2v8, pwron and reset files represent the state of the respective signal.

The power_sequence file implements power-up/power-down sequence in accordance with the GlobalLocate data sheet.

Powering up
root@fic-gta01:~$ echo "power_up" > /sys/bus/platform/devices/gta01-pm-gps.0/power_sequence 
Powering down
root@fic-gta01:~$ echo "power_down" > /sys/bus/platform/devices/gta01-pm-gps.0/power_sequence

Asound driver

High-level requirements

The GTA01 audio subsystem is fairly complex, even though the high-level requirements for the sound driver are simple. The features we need to support

  • voice call support
    • passing through the microphone signal to the GSM Modem
    • passing through the GSM Modem audio output to the integrated speaker(s)
    • the microphone input mixer gain will be statically configured according to the dynamic requirements
    • the audio volume that is sent to the GSM modem can be adjusted via line out level
    • the audio volume incoming (from GSM modem -> codec) can be adjusted via speaker out level
  • voice call recording support
    • the user is able to record phone conversations on digital storage inside the phone. Format will be ogg (not important to driver)
    • ideally, the user can choose between recording only incoming or outgoing signal, or both.
    • for both, we'd need to mix both microphone and line-in signals before recording. is this possible?
  • voice call playback support
    • the user is able to playback recorded files during a conversation. this means that PCM playback needs to be mixed with mic input before being passed to line-out (and to the GSM modem)
  • media playback support
    • an audio player can play back mp3/ogg/flac/... files and output sound via integrated speakers or headphone
  • headphone jack switch
    • this is connected to a GPIO of the S3C2410. How to best integrate this with the sound driver? It should just be handled like any other headphone jack reporting of e.g. laptop computers.

For more details see Neo1973 Audio Subsystem

蓝牙

We're using the stock bluez implementation of the linux kernel.

Power Management

The bluetooth basically has the following preconditions

  • BT_EN being set
  • The Voltage regulator set up properly
  • The ohci-hcd driver being loaded

The gta01_pm_bt driver implements the following files:

root@fic-gta01:/$ ls -l /sys/devices/platform/gta01-pm-bt.0
-rw-r--r--    1 root     root         4096 Feb  1 09:52 power_on
-rw-r--r--    1 root     root         4096 Feb  1 09:52 reset
Powering up the device
root@fic-gta01:/$ echo "1" >  /sys/devices/platform/gta01-pm-bt.0/power_on  
usb 1-1: new full speed USB device using s3c2410-ohci and address 4
usb 1-1: configuration #1 chosen from 1 choice
Powering down the device
root@fic-gta01:/$ echo "0" >  /sys/devices/platform/gta01-pm-bt.0/power_on 
usb 1-1: USB disconnect, address 3
Asserting reset (low-active)
root@fic-gta01:/$ echo "0" >  /sys/devices/platform/gta01-pm-bt.0/reset 
root@fic-gta01:/$ usb 1-1: USB disconnect, address 2
De-asserting reset (low-active)
root@fic-gta01:/$ echo "1" >  /sys/devices/platform/gta01-pm-bt.0/reset 
s3c2410-ohci s3c2410-ohci: wakeup
usb 1-1: new full speed USB device using s3c2410-ohci and address 3
usb 1-1: configuration #1 chosen from 1 choice

Getting started

root@fic-gta01:~$ hciconfig hci0 up
root@fic-gta01:~$ hcitool  scan
Scanning ...
        00:14:9A:77:A2:02       A780
root@fic-gta01:~$ hcitool inq 00:14:9A:77:A2:02 
Inquiring ...
        00:14:9A:77:A2:02       clock offset: 0x55df    class: 0x502204
root@fic-gta01:~$ hcitool cc 00:14:9A:77:A2:02 
root@fic-gta01:~$ hcitool con                 
Connections:
        < ACL 00:14:9A:77:A2:02 handle 42 state 1 lm MASTER 
root@fic-gta01:~$ hcitool info 00:14:9A:77:A2:02
Requesting information ...
        BD Address:  00:14:9A:77:A2:02
        Device Name: A780
        LMP Version: 1.1 (0x1) LMP Subversion: 0x700
        Manufacturer: Broadcom Corporation (15)
        Features: 0xff 0xff 0x0d 0x00 0x00 0x00 0x00 0x00
                <3-slot packets> <5-slot packets> <encryption> <slot offset> 
                <timing accuracy> <role switch> <hold mode> <sniff mode> 
                <park state> <RSSI> <channel quality> <SCO link> <HV2 packets> 
                <HV3 packets> <u-law log> <A-law log> <CVSD> <power control> 
                <transparent SCO> 

AUX Button

The AUX button (formerly 911 button) is supported via the "gta01kbd" driver in the kernel (drivers/input/keyboard/gta01kbd.c).

It creates an input event device that only issues "KEY_PHONE" press/unpress events.

Power Management Unit (PMU)

The PMU is supported via the "pcf50606" driver in the kernel (drivers/i2c/chips/pcf50606.c).

This driver provides a number of userspace interfaces for the various bits and pieces of the PMU

Power Button, Charger insertion

The PMU creates an input device that supports the following keys:

  • KEY_POWER: power button of GTA01
  • KEY_POWER2: USB power supply insert/remove
  • KEY_BATTERY: Charger insert/remove

实时时钟

The real-time clock, including the alarm feature, is implemented as standard RTC (/dev/rtc).

看门狗

The PMU-integrated watchdog is implemented using the standard watchdog character device.

Voltage Regulators

The voltage regulators are exported to userspace using sysfs, much like lm_sensors.

Every regulator can be read (and written!). The format is ASCII in millivolts.

root@fic-gta01:/sys/devices/platform/s3c2410-i2c/i2c-0/0-0008$ ls -l /sys/bus/i2c/devices/0-0008/voltage_*
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_d1reg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_d2reg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_d3reg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_dcd
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_dcde
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_dcud
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_lpreg
-rw-r--r--    1 root     root         4096 Sep  3 11:55 /sys/bus/i2c/devices/0-0008/voltage_ioreg
root@fic-gta01:/sys/devices/platform/s3c2410-i2c/i2c-0/0-0008$ cat voltage_dcd
1300

Battery Voltage

The battery voltage (in millivolts) can be read via sysfs

root@fic-gta01:~$ cat /sys/bus/i2c/devices/0-0008/battvolt 
3767

Battery charging current

The battery charging current (in milliamperes) can be read via sysfs

root@fic-gta01:~$ cat /sys/bus/i2c/devices/0-0008/chgcur 
0

电池温度

The battery temperature (in centigrades) can be read via sysfs

root@fic-gta01:~$ cat /sys/bus/i2c/devices/0-0008/battemp
25

内核TODO列表

Various

  • speed up in-kernel boot process
    • delay calibration
    • framebuffer takes ages

TS07.10 multiplex

PCF50606

  • fix conversion problems when setting alarm time/date
  • check conversion table for temperature
  • implement 'persistent alarm setting' (see mail from mickey)

Backlight

  • later: implement smooth fade-in, fade-out

Vibrator

  • implement it as LED driver
  • test it
  • later: implement PWM

USB设备驱动

  • test switching between usb host and usb device

Power Management

  • test, debug and fix suspend on user request
  • test, debug and fix wakeup on
    • IRQ on serial UART (GSM)
    • IRQ on serial UART (GPS)
    • IRQ from PMU (charger insert/remove or the like)
    • IRQ from ADC/touchscreen
    • 911 button press (GPIO IRQ)
    • headphone jack insert/remove