example code to setup and use keypad on 4460

Jeffrey Graham

Prodigy 170 points

Other Parts Discussed in Thread: 4430

Hello everyone,

I have a Variscite SOC with a OMAP4460 running linux, specs here:

http://www.variscite.com/products/item/76-var-som-om44-ti-omap4460

Can anyone provide a simple example program of how to setup and read the keypad?

Thanks,

Jeff

over 12 years ago

0 Manuel Contreras over 12 years ago

TI__Genius 10545 points

for a reference to this you can look at 4430's TRM chapter 26, around page 5409.

26.5 Keyboard Controller Programming Guide

0 Manuel Contreras over 12 years ago in reply to Manuel Contreras

TI__Genius 10545 points

sorry, i forgot TRM links
OMAP4430 Multimedia Device Silicon Revision 2.x
http://www.ti.com/pdfs/wtbu/OMAP4430_ES2.x_PUBLIC_TRM_vAA.zip
OMAP4460 Multimedia Device Silicon Revision 1.x
http://www.ti.com/pdfs/wtbu/OMAP4460_ES1.x_PUBLIC_TRM_vL.zip
OMAP4470 Multimedia Device Silicon Revision 1.0
http://www.ti.com/pdfs/wtbu/OMAP4470_ES1.0_PUBLIC_TRM_vD.zip

0 Manuel Contreras over 12 years ago in reply to Manuel Contreras

TI__Genius 10545 points

Graham;

you can find a keypad definition in next files that can be copied to board-omap4panda.c [__init omap4_panda_init(..)], or make reference to them,

./kernel/android-3.0/arch/arm/plat-omap/include/plat/omap4-keypad.h

struct omap4_keypad_platform_data {
    const struct matrix_keymap_data *keymap_data;
    u8 rows;
    u8 cols;
    void (*keypad_pad_wkup)(int enable);
};

extern int omap4_keyboard_init(struct omap4_keypad_platform_data *);

./kernel/android-3.0/arch/arm/mach-omap2/board-4430sdp.c

/*
* As OMAP4430 mux HSI and USB signals, when HSI is used (for instance HSI
* modem is plugged) we should configure HSI pad conf and disable some USB
* configurations.
* HSI usage is declared using bootargs variable:
* board-4430sdp.modem_ipc=hsi
* Any other or missing value will not setup HSI pad conf, and port_mode[0]
* will be used by USB.
* Variable modem_ipc is used to catch bootargs parameter value.
*/
static char *modem_ipc = "n/a";
module_param(modem_ipc, charp, 0);
MODULE_PARM_DESC(modem_ipc, "Modem IPC setting");

static void __init omap_4430sdp_init(void)

...
...

    status = omap4_keyboard_init(&sdp4430_keypad_data);
    if (status)
        pr_err("Keypad initialization failed: %d\n", status);

    omap_dmm_init();
    omap_4430sdp_display_init();
    blaze_panel_init();
    blaze_keypad_init();

...
...

./kernel/android-3.0/arch/arm/mach-omap2/devices.c

int __init omap4_keyboard_init(struct omap4_keypad_platform_data
                        *sdp4430_keypad_data)
{
    struct omap_device *od;
    struct omap_hwmod *oh;
    struct omap4_keypad_platform_data *keypad_data;
    unsigned int id = -1;
    char *oh_name = "kbd";
    char *name = "omap4-keypad";

    oh = omap_hwmod_lookup(oh_name);
    if (!oh) {
        pr_err("Could not look up %s\n", oh_name);
        return -ENODEV;
    }

    keypad_data = sdp4430_keypad_data;

    od = omap_device_build(name, id, oh, keypad_data,
            sizeof(struct omap4_keypad_platform_data),
            omap_keyboard_latency,
            ARRAY_SIZE(omap_keyboard_latency), 0);

    if (IS_ERR(od)) {
        WARN(1, "Can't build omap_device for %s:%s.\n",
                        name, oh->name);
        return PTR_ERR(od);
    }

    return 0;
}

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example code to setup and use keypad on 4460