i.MX Processors中的主题 Re: Wake up using MPR121 interrupt

Wake up using MPR121 interrupt

winstonrodrigue — Mon, 29 Apr 2013 10:04:49 GMT

Dear Pals,

I am working on IMX53_smd board (SABRE tablet) ...

So I wanted to make this board to wake up when I touch the touch keys (MPR121) .

I can wake up the system using GPIOs as well as volume + / volume - keys...

static struct gpio_keys_button smd_buttons[] = {

GPIO_BUTTON(MX53_PAD_EIM_A24__GPIO5_4, TOUCH_INTERRPT ,1,"touching",1),

GPIO_BUTTON(MX53_SMD_KEY_VOL_UP, KEY_VOLUMEUP, 1, "volume-up", 1),

GPIO_BUTTON(MX53_SMD_KEY_VOL_DOWN, KEY_VOLUMEDOWN, 1, "volume-down", 1),

};

in above code I wanted to know where is KEY_VOLUMEUP and KEY_VOLUMEDOWN is defined.. because when i compile

i get error saying TOUCH_INTERRPT not defined...

One more thing......

If the system is sleep /suspend mode whether the MP121 chip gets the power ???

Regards,

Winston,

Re: Wake up using MPR121 interrupt

admin — Tue, 11 Jun 2013 21:37:17 GMT

AdrianAlonso replied:

KEY_VOULUMEUP, KEY_VOULUMEDOWN are macros defined in "include/linux/input.h"

the GPIO_BUTTON macros help to map a given GPIO to a Key code that user space applications will interpret such a key volume up;

You can define an macro for TOUCH_INTERRUPT, but typically for touch screen drivers the interrupt line is used to trigger a new read on MPR121 and emit the X,Y input events.

In MPR121 touch screen driver handles suspend/resume callbacks to properly power down/up the device.

See drivers/input/keyboard/mpr121.c

And from arch/arm/mach-mx5/mx53_smd.c code:

static struct i2c_board_info mxc_i2c1_board_info[] __initdata = {

{

.type = "sgtl5000-i2c",

.addr = 0x0a,

{

.type = "mpr121_touchkey",

.addr = 0x5a,

.irq = gpio_to_irq(MX53_SMD_KEY_INT),

.platform_data = &mpr121_keyboard_platdata,

{

.type = "mag3110",

.addr = 0x0e,

.irq = gpio_to_irq(MX53_SMD_eCOMPASS_INT),

};

The letters in bold show where mpr121 driver is associated and MX53_SMD_KEY_INT correspond to GPIO 5_4

Re: Wake up using MPR121 interrupt

winstonrodrigue — Tue, 02 Jul 2013 12:44:19 GMT

thank you..... :smileyhappy: