Error while probing TSC2007 to I2C in TI AM18O8

Everything was done with mux entry in mux.h file inside mach-davinci/include/mach/mux.h

the corresponding GPIO pin for the IRQ line ie PENIRQ is GPIO8_12 for our SOM and EVM


for two codes tried, there was two errors.


   1. First  error was

Failed to register i2c client tsc2007 at 0x90 (-16)                  
i2c i2c-1: Can't create device at 0x90


the part of the first code was










#include <linux/i2c/tsc2007.h>
------------------------------
#define DA850_EVM_TSC2007_ADDRESS 0x90


/*
 * TSC 2007 Support for Calixto-EVM
 */
#define TSC2007_GPIO_IRQ_PIN    GPIO_TO_PIN(8, 12)

static int tsc2007_init_irq(void)
{
    int ret = 0;

    ret = gpio_request(TSC2007_GPIO_IRQ_PIN, "tsc2007-irq");
    if (ret < 0) {
        pr_warning("Failed to Set TSC2007 IRQ GPIO: %d\n", ret);
        return ret;
    }

    ret = davinci_cfg_reg(DA850_GPIO8_12);
    if (ret) {
        pr_warning("%s: PinMux setup for GPIO %d failed: %d\n",
               __func__, TSC2007_GPIO_IRQ_PIN, ret);
        return ret;
    }

    gpio_direction_input(TSC2007_GPIO_IRQ_PIN);

    return ret;
}

static void tsc2007_exit_irq(void)
{
    gpio_free(TSC2007_GPIO_IRQ_PIN);
}

static int tsc2007_get_irq_level(void)
{
    return gpio_get_value(TSC2007_GPIO_IRQ_PIN) ? 0 : 1;
}

struct tsc2007_platform_data tsc2007_pdata = {
    .model = 2007,
    .x_plate_ohms = 180,
    .get_pendown_state = tsc2007_get_irq_level,
    .init_platform_hw = tsc2007_init_irq,
    .exit_platform_hw = tsc2007_exit_irq,
};

static struct i2c_board_info __initdata da850_evm_i2c_devices[] = {
    {
        I2C_BOARD_INFO("tps6507x", 0x48),
        .platform_data = &tps_board,
    },
    {
        I2C_BOARD_INFO("tlv320aic3x", 0x18),
    },
    {
        I2C_BOARD_INFO("tca6416", 0x20),
        .platform_data = &da850_evm_ui_expander_info,
    },
    {
        I2C_BOARD_INFO("cdce913", 0x65),
    },
    {
        I2C_BOARD_INFO("tsc2007", DA850_EVM_TSC2007_ADDRESS),
            .platform_data  = &tsc2007_pdata,
        .irq = gpio_to_irq(TSC2007_GPIO_IRQ_PIN),
    },
};


};

        i2c_register_board_info(1, da850_evm_i2c_devices,
            ARRAY_SIZE(da850_evm_i2c_devices));










The second error was




the code was modified again and the next issue i got while porting was



tsc2007 init...
tsc2007 probing..
tsc2007 1-0090: i2c io error: -6

the modified code was


#include <linux/i2c/tsc2007.h>
------------------------------
#define DA850_EVM_TSC2007_ADDRESS 0x90


/*
 * TSC 2007 Support for Calixto-EVM
 */
#define TSC2007_GPIO_IRQ_PIN    GPIO_TO_PIN(8, 12)

static int tsc2007_init_irq(void)
{
    int ret = 0;

    ret = gpio_request(TSC2007_GPIO_IRQ_PIN, "tsc2007-irq");
    if (ret < 0) {
        pr_warning("Failed to Set TSC2007 IRQ GPIO: %d\n", ret);
        return ret;
    }

    ret = davinci_cfg_reg(DA850_GPIO8_12);
    if (ret) {
        pr_warning("%s: PinMux setup for GPIO %d failed: %d\n",
               __func__, TSC2007_GPIO_IRQ_PIN, ret);
        return ret;
    }

    gpio_direction_input(TSC2007_GPIO_IRQ_PIN);

    return ret;
}

static void tsc2007_exit_irq(void)
{
    gpio_free(TSC2007_GPIO_IRQ_PIN);
}

static int tsc2007_get_irq_level(void)
{
    return gpio_get_value(TSC2007_GPIO_IRQ_PIN) ? 0 : 1;
}

struct tsc2007_platform_data tsc2007_pdata = {
    .model = 2007,
    .x_plate_ohms = 180,
    .get_pendown_state = tsc2007_get_irq_level,
    .init_platform_hw = tsc2007_init_irq,
    .exit_platform_hw = tsc2007_exit_irq,
};

static struct i2c_board_info __initdata da850_evm_tsc2007_dev[] = {
    [0]= {
        I2C_BOARD_INFO("tsc2007", DA850_EVM_TSC2007_ADDRESS),
        .platform_data  = &tsc2007_pdata,
    },



    da850_evm_tsc2007_dev[0].irq = gpio_to_irq(TSC2007_GPIO_IRQ_PIN),
    i2c_register_board_info(1, da850_evm_tsc2007_dev,
            ARRAY_SIZE(da850_evm_tsc2007_dev));