Re: Using PXA arm board with MAX7319 GPIO expander input

[Eric Miao <eric.y.miao@gmail.com>]

On Mon, Feb 8, 2010 at 1:44 PM, Jebediah Huang <jebediah.huang@gmail.com> wrote:
> Hello ,
>
> I have PXA166 board with MAX7319 GPIO expander connected with 8
> buttons. When any button is pressed, I want to get input event. Can
> this be done?
>
> I have read the littleton and aspenite code to try. The SDA is 105,
> SCL is 106. I use MAX732x driver. It is set as I2C slave at 0x6C. So I
> set up:
>
> static struct i2c_pxa_platform_data pwri2c_info __initdata = {
>        .use_pio                = 1,
> };
>
> static unsigned long peony_pin_config[] __initdata = {
>        /* i2c bus */
>        GPIO105_CI2C_SDA,
>        GPIO106_CI2C_SCL,
> }
>
> static struct max732x_platform_data max7319_data[] = {
>        [0] = {
>                .gpio_base      = GPIO_EXT0(0),
>        },
> };
>
> static struct i2c_board_info i2c_board_info[] =
> {
>        {
>                .type           = "max7319",
>                .addr           = 0x6C,
>                .irq            = IRQ_GPIO(105),
>                .platform_data  = &max7319_data[0],
>        },
> };
>
> when bootup I see;
> <6>[    0.290770] I2C: i2c-0: PXA I2C adapter
> <6>[    0.307118] I2C: i2c-1: PXA I2C adapter
> <6>[    0.821709] hello pony_init
> <3>[    0.838559] platform_driver_register
> <6>[    0.868069] max732x_read: read g 1
> <6>[    0.881893] max732x_read: read g 0
> <4>[    0.898895] i2c: error: exhausted retries
> <4>[    0.911947] i2c: msg_num: 0 msg_idx: -2000 msg_ptr: 0
> <4>[    0.927509] i2c: ICR: 000007e0 ISR: 00000002
> <4>[    0.927526] i2c: log: [00000006:00000000] [00000006:00000000]
> [00000006:00000000] [00000006:00000000] [00000006:00000000]
> [00000006:00000000] [0000000
> <3>[    1.167890] dummy 0-005d: failed reading

Just noted the exhausted retries are for 0-005d, you sure this is
max7319 instead of something else, as I was seeing the max7319
address to be 0x6c in the setup above?
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