From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jebediah Huang <jebediah.huang@gmail.com>
Subject: Using PXA arm board with MAX7319 GPIO expander input
Date: Mon, 8 Feb 2010 13:44:10 +0800
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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
<5>[    1.182585] SCSI subsystem initialized

Maybe max732x driver is not getting correct data from my setup? No
event when pressing button. If any ideas?

Thank you very much!
Jeb