AM3517-EVM Application board J29 -- map a line to GPIO and an IRQ

Couple of questions,

 - Have you verified pin-mux configuration?

 - You can set the mux setting in board file, search for "board_mux" and add entry for your gpio pin.

 - You can also use devmem tool to read/write the register directly. just google for devmem tool and you will get the application.

I am sure that you are already aware that, we are doing similar thing for TSC2004 on EVM.

Thanks,

Vaibhav

Do you mean here:

#ifdef CONFIG_OMAP_MUX
static struct omap_board_mux board_mux[] __initdata = {
    /* USB OTG DRVVBUS offset = 0x212 */
    OMAP3_MUX(SAD2D_MCAD23, OMAP_MUX_MODE0 | OMAP_PIN_INPUT_PULLDOWN),
    OMAP3_MUX(MCBSP_CLKS, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
    OMAP3_MUX(GPMC_NCS4, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLDOWN),
    OMAP3_MUX(SYS_NRESWARM, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
    { .reg_offset = OMAP_MUX_TERMINATOR },
};
#endif

?

Then I guess no.  I'll add that.  I'm still trying to run down if the external hardware will let the line pull high for the active low IRQ input.

Corrected code should be:

#ifdef CONFIG_OMAP_MUX
static struct omap_board_mux board_mux[] __initdata = {
    /* USB OTG DRVVBUS offset = 0x212 */
    OMAP3_MUX(SAD2D_MCAD23, OMAP_MUX_MODE0 | OMAP_PIN_INPUT_PULLDOWN),
    OMAP3_MUX(MCBSP_CLKS, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
    OMAP3_MUX(GPMC_NCS4, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLDOWN),
    OMAP3_MUX(SYS_NRESWARM, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),

    OMAP3_MUX(MCBSP3_CLKX, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
    { .reg_offset = OMAP_MUX_TERMINATOR },
};
#endif

Seems to compile, I'll have to test it 2/28.

Got the touchpad driver working, just have to get this IRQ fixed.

Thanks,

Bill

OK,

I tried both MCBSP3_CLKX and MCBSP4_CLKX which are J29 pins 62 and 61. 

In either case, I can only get pull-up to about 300mV after the change to pin mux.  Before, they stayed at zero.  Those lines run to be "B" side of the U35 TXS0108E level translator chip.  The OE pin is low, so they should be in High Z state

I can't get the line to go high.  The pins are U35 pin 16 and pin 18.

Does anyone know if there is a better signal to use on that 100 pin J29 solder pad area?

Thanks,

Bill

Got it.  Thanks Mark Utter!

AM3517 SOM, page 10 of schematic.  MMC1_D7 needs to be high to turn off buffer.

Code updates:

#define GPIO_MAXTOUCH_IRQ   152
#define GPIO_MMC1_DAT7      129

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

    omap_mux_init_gpio(GPIO_MAXTOUCH_IRQ, OMAP_PIN_INPUT_PULLUP);
    omap_mux_init_gpio(GPIO_MMC1_DAT7,    OMAP_PIN_OUTPUT);
    
    ret = gpio_request(GPIO_MAXTOUCH_IRQ, "maXTouch-irq");
    if (ret < 0) {
        printk(KERN_WARNING "failed to request GPIO#%d: %d\n",
                GPIO_MAXTOUCH_IRQ, ret);
        return 0;
    }

    if (gpio_direction_input(GPIO_MAXTOUCH_IRQ)) {
        printk(KERN_WARNING "GPIO#%d cannot be configured as "
                "input\n", GPIO_MAXTOUCH_IRQ);
        return 0;
    }

    ret = gpio_request(GPIO_MMC1_DAT7, "maXTouch-data");
    if (ret < 0) {
        printk(KERN_WARNING "failed to request GPIO#%d: %d\n",
                GPIO_MAXTOUCH_IRQ, ret);
        return 0;
    }

    if (gpio_direction_output(GPIO_MMC1_DAT7, 1)) {
        printk(KERN_WARNING "GPIO#%d cannot be configured as "
                "output\n", GPIO_MMC1_DAT7);
        return 0;
    }
    
    gpio_set_debounce(GPIO_MAXTOUCH_IRQ, 0xa);
    return gpio_to_irq(GPIO_MAXTOUCH_IRQ);
}

#ifdef CONFIG_OMAP_MUX
static struct omap_board_mux board_mux[] __initdata = {
    /* USB OTG DRVVBUS offset = 0x212 */
    OMAP3_MUX(SAD2D_MCAD23, OMAP_MUX_MODE0 | OMAP_PIN_INPUT_PULLDOWN),
#ifdef CONFIG_TOUCHSCREEN_TSC2004
    OMAP3_MUX(MCBSP_CLKS, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
#endif    
    OMAP3_MUX(GPMC_NCS4, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLDOWN),
    OMAP3_MUX(SYS_NRESWARM, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
#ifdef CONFIG_ATMEL_MAXTOUCH    
    OMAP3_MUX(MCBSP4_CLKX, OMAP_MUX_MODE4 | OMAP_PIN_INPUT_PULLUP),
    OMAP3_MUX(SDMMC1_DAT7,   OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
#endif    
    { .reg_offset = OMAP_MUX_TERMINATOR },
};

Also added:

static u8 maXTouch_read_chg(void)
{
    return gpio_get_value(GPIO_MAXTOUCH_IRQ) ? 1 : 0;
}

And changed device info:

static struct mxt_platform_data maXTouch_platform_data = {
    .numtouch = 1,
    .max_x    = 2048,
    .max_y    = 2048,
    .init_platform_hw = &My_maXTouch_init_irq,
    .exit_platform_hw = &My_maXTouch_exit_irq,
    .valid_interrupt = &maXTouch_irq_level,
    .read_chg        = &maXTouch_read_chg,
};

This got it working.

I'll need to filter some events from the maXTouch driver.  It reports too many sync events.

Also, in the driver, the key event needed to be posted.  It was being reported as _abs and not _key:

    if (last_touch) {
        /*
         * For compatibility with single-touch systems, send also
         * ABS_X & ABS_Y & BTN_TOUCH events.
         */
        if (stored_size[0]) {
            input_report_key(mxt->input, BTN_TOUCH, 1);
            input_report_abs(mxt->input, ABS_X, stored_x[0]);
            input_report_abs(mxt->input, ABS_Y, stored_y[0]);
        } else {
            input_report_key(mxt->input, BTN_TOUCH, 0);
        }

--Bill