request_irq failed

Hi Bob,

bob lee said:

I printed out the value of irq_num.It's 166.

Yes, it is right.

Can you check if you already use this 166 interrupt in your board? I mean you should boot up your board without irq request and do:

root@dm814x-evm:~# cat /proc/interrupts
           CPU0
  4:          0        INTC  omap2_elm
 12:       2665        INTC  edma
 14:          0        INTC  edma_error
 16:          0        INTC  ahci
 17:          0        INTC  cppi41_dma
 18:          0        INTC  musb-hdrc.0
 20:          0        INTC  gpmc
 28:       8091        INTC  mmc0
 30:          0        INTC  omap_i2c
 37:          0        INTC  SGX ISR
 38:          0        INTC  HDMI
 40:          0        INTC  cpsw.0
 41:        296        INTC  cpsw.0
 42:          7        INTC  cpsw.0
 43:          0        INTC  cpsw.0
 44:          0        INTC  serial idle
 45:          0        INTC  serial idle
 46:          0        INTC  serial idle
 67:       3984        INTC  gp timer
 70:       1010        INTC  omap_i2c
 72:        396        INTC  serial idle, OMAP UART0
 73:          0        INTC  serial idle
 74:          0        INTC  serial idle
 75:          0        INTC  rtc0
 76:          0        INTC  rtc0
 77:       1061        INTC  mailbox-dsp, mailbox-video, mailbox-vpss
122:          0        INTC  omap-iommu.1
123:          0        INTC  omap-iommu.0
191:          2        GPIO  qt602240_ts
Err:          0
root@dm814x-evm:~#


As you can see, in the DM814x TI EVM, 166 is free to use, what about your side? As you can see, in the DM814x TI EVM, gpio0_31 is used as interrupt (191 -> qt602240_ts). See how this is done in the board-ti8148evm.c ti814x_tsc_init(void) function.

Regards,
Pavel

Bob,

bob lee said:

request_irq(irq_num,get_state,IRQF_DISABLED,"buttons",(void *)buf);

I suspect irq_num (166) is fine, the problem should be in other arguments (get_state, "buttons"). Could you please provide more info on these?

BR
Pavel

Hi Bob,

First make sure you have enabled the GP0[6] in pinmux, have a look at the following code which uses gp0[6], and you can use it as is
to test and later configure irq as per your requirements.

#include <linux/module.h>
#include <linux/version.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <mach/hardware.h>
#include <asm/gpio.h>


static int gpio_num;

DECLARE_COMPLETION(work);

static irqreturn_t handler (int irq, void * dev)
{
complete_all(&work);
return IRQ_HANDLED;
}

int init_module()
{
int status;
int irq;

init_completion(&work);

/* gp0[6] */
gpio_num = 6;

status = gpio_request(gpio_num, "gpio_test\n");
if (status < 0) {
printk("ERROR can not open GPIO %d\n", gpio_num);
return status;
}

gpio_direction_input(gpio_num);
gpio_export(gpio_num, true);

if(gpio_get_value(gpio_num) == 0)
printk("OFF. \n\tWaiting for the pin to be on..\n");
else
printk("ON. \n\tWaiting for the pin to be off..\n");

irq = gpio_to_irq(gpio_num);
status = request_irq(irq, handler, 0, "gpio_test", NULL);
if(status < 0) {
printk(KERN_ERR "error %d requesting GPIO IRQ %d\n", status, gpio_num);
return status;
}

set_irq_type(irq, IRQ_TYPE_EDGE_RISING);

wait_for_completion_interruptible(&work);

printk(".. done\n");

return 0;
}

void cleanup_module(void) {
free_irq(gpio_to_irq(gpio_num), NULL);
gpio_free(gpio_num);
}

MODULE_LICENSE("GPL");

Thanks And Regards,
Mike

Hi Pavel,

Here is the get_state function as below.

static irqreturn_t get_state(int irq_num,void *dev)

{

printk("get_state run again!\n");

return IRQ_HANDLED;

}

I could request irq now and there is no error. But the function isn't to be executed when interrupt occurs.

I don't know why.

Another question,After requested irq successfully,how to get the value of gpio0_6?

That is to say ,I want to know the status of gpio0_6,high level or low?

BR

Bob

Hi Prabhakar,

The gpio0[6] connect to the chip tca9535.We want to check the interrupts outside by GPIO0[6].

BR

Bob

Hi Prabhakar,

It is ok now .

Thank you very much.

Bob

Hi Bob,

I have the same issue request_irq is successful, but the interrupt is not called...
I also used the exact example given above from TI, but I still can't get the gpio interrupt to be called.
With sysfs entries the same gpio irq works just well ...

How did you solve this issue ? Can you please share the solution ?

Thank you,
Ran

Sorry,I haven't solved it.

Bob