Introduction to Android G Sensor I²C Driver on Android

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Introduction to Android G sensor I²C Driver on Android Bo-Yi Wu 2010.06.04 Gemtek Technology Co., Ltd

Outline <ul><li>What’s G sensor ? </li></ul><ul><li>I²C Driver </li></ul><ul><li>Kernel Patch </li></ul><ul><li>Issue </li...

What’s G sensor & Application <ul><li>As accelerometers are more and more present in mobile devices, new features are deve...

Orientation estimation

Orientation estimation

Stability check <ul><li>STABLE_THRES </li></ul><ul><li>STABLE_COUNT_MIN </li></ul><ul><ul><li>calling rate? bigger or sma...

Code Review

I²C : detection capability set i2c address value detect call back function detect address fill the structure i2c_board_info

New-style drivers vs Legacy drivers <ul><li>Legacy drivers duplicate a lot of code . </li></ul><ul><li>The code needed in...

New-style drivers: initial function <ul><li>module_init ( BMA150_init ); </li></ul><ul><ul><li>return i2c_add_driver (&...

G Sensor: bma150_driver structure <ul><li>New-style driver </li></ul>Legacy driver probe: Callback for device binding (new...

Legacy driver: address_data

New-style drivers: address_data /* Internal numbers to terminate lists */ I2C_CLIENT_END : 0xfffeU I2C_CLIENT_INSMOD_1 ~...

I2c Driver: i2c_register_driver 1. new style driver methods can't mix with legacy ones /* check bma150_driver is news sty...

I2c Driver: __attach_adapter <ul><li>Call __attach_adapter function </li></ul><ul><ul><li>New style driver: </li></ul></...

I2c Driver: i2c_detect <ul><li>/* initial i2c client structure */ </li></ul><ul><li>struct i2c_client *temp_client; temp_c...

I2c Driver: i2c_detect_address <ul><li>/* Make sure the address is valid */ </li></ul><ul><li>( addr < 0x03 || addr >...

I2c Driver: i2c_new_device <ul><li>Set i2c_client info from i2c_board_info structure </li></ul><ul><li>strlcpy (client...

I2c Driver: i2c_device_match <ul><li>I2c_bus_type is used on new-style driver </li></ul><ul><li>i2c_device_match </li>...

I2c Driver:bma150_probe <ul><li>/* bma150 device create ok if return 0*/ </li></ul><ul><li>misc_register (&bma_device); </...

I2c Driver: file_operations

Build Linux Kernel <ul><li>Edit Kconfig & Makefile </li></ul><ul><li>Patch all files(bma150_drivers.c…) </li></ul><ul><li>...

Issue: can’t create device <ul><li>/* Make sure there is something at this address */ </li></ul><ul><li>i2c_smbus_xfer (ad...

Demo To Do: jni module

Reference <ul><li>Linux Device Drivers, Third Edition </li></ul>

<ul><li>Thank You. </li></ul>

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