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Known GPIOs:

pin bit Description Input/output IRQ ALT Sleep Init
GPIOA0 0x0001 sound related (i2c bus arbiter?) O -
GPIOA1 0x0002 sound codec on O -
GPIOA2 0x0004 I1 -
GPIOA3 0x0008 headphone pwr on O -
GPIOA4 0x0010 O -
GPIOA5 0x0020 O -
GPIOA6 0x0040 speaker on O -
GPIOA7 0x0080 USB_PUEN O - 1-1
GPIOA8 0x0100 CAM reset? O -
GPIOA9 0x0200 O -
GPIOA10 0x0400 O -
GPIOA11 0x0800 GPS_2.85EN O -
GPIOA12 0x1000 GPS_EN O -
GPIOA13 0x2000  ? O ALT
GPIOA14 0x4000  ? I1 ALT
GPIOA15 0x8000 LCD power5 O -

pin bit Description Input/output IRQ ALT Sleep Init
GPIOB0 0x0001 gsm dcd? I RE -
GPIOB1 0x0002 sdcard insert (1=in,0=out) I -
GPIOB2 0x0004 gsm bb ready? I -
GPIOB3 0x0008 BB_INT O -
GPIOB4 0x0010 bt what? I -
GPIOB5 0x0020 acx irq I -
GPIOB6 0x0040 USB detect I RE -
GPIOB7 0x0080 I RE -
GPIOB8 0x0100 AC detect(=0) I -
GPIOB9 0x0200 HP detect(=0) I - 0-0
GPIOB10 0x0400 sound related I -
GPIOB11 0x0800 codec ? I -
GPIOB12 0x1000 involved with GPS? I -
GPIOB13 0x2000 #GPS_RESET O -
GPIOB14 0x4000 AC charge enable(=0) O - 1-1
GPIOB15 0x8000 acx_power_1 O -

pin bit Description Input/output IRQ ALT Sleep Init
GPIOC1 0x0002 LED1 O LED1
GPIOC2 0x0004 LED2 O LED2 0-0
GPIOC3 0x0008 SPI_RX(gps) I SPI_TX -
GPIOC4 0x0010 SPI_TX(gps) O SPI_TX - 0-0
GPIOC5 0x0020 SPI_CLK(gps) O SPI_CLK -
GPIOC6 0x0040 SPI_CS(gps) O -
GPIOC7 0x0080 BT reset O - 1-1
GPIOC8 0x0100 acx_reset O -
GPIOC9 0x0200 LCD power1 O -
GPIOC10 0x0400 LCD power2 O -
GPIOC11 0x0800 O -
GPIOC12 0x1000 gsm 4? O -
GPIOC13 0x2000 gsm 5? O -
GPIOC14 0x4000 O -
GPIOC15 0x8000 acx related O -

pin bit Description Input/output IRQ ALT Sleep Init
GPIOD1 0x0002 CAM power(=1) O -
GPIOD2 0x0004 O -
GPIOD3 0x0008 acx_power_2 O -
GPIOD4 0x0010 gsm 1? O -
GPIOD5 0x0020 gsm 6? O -
GPIOD6 0x0040 BT power O -
GPIOD7 0x0080 O -
GPIOD8 0x0100 gsm 2? O -
GPIOD9 0x0200 CAM enable(=0) O - 1-0
GPIOD10 0x0400 Vibra O -
GPIOD11 0x0800 GPS_13M O -
GPIOD12 0x1000 backlight lcd O -
GPIOD13 0x2000 O -
GPIOD14 0x4000 backlight keyphone O -
GPIOD15 0x8000 backlight keyboard O -