mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 09:41:44 +00:00
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
|
|
* Simple gptimers example
|
|
* http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:gptimers
|
|
*
|
|
* Copyright 2007-2009 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/gptimers.h>
|
|
#include <asm/portmux.h>
|
|
|
|
/* ... random driver includes ... */
|
|
|
|
#define DRIVER_NAME "gptimer_example"
|
|
|
|
struct gptimer_data {
|
|
uint32_t period, width;
|
|
};
|
|
static struct gptimer_data data;
|
|
|
|
/* ... random driver state ... */
|
|
|
|
static irqreturn_t gptimer_example_irq(int irq, void *dev_id)
|
|
{
|
|
struct gptimer_data *data = dev_id;
|
|
|
|
/* make sure it was our timer which caused the interrupt */
|
|
if (!get_gptimer_intr(TIMER5_id))
|
|
return IRQ_NONE;
|
|
|
|
/* read the width/period values that were captured for the waveform */
|
|
data->width = get_gptimer_pwidth(TIMER5_id);
|
|
data->period = get_gptimer_period(TIMER5_id);
|
|
|
|
/* acknowledge the interrupt */
|
|
clear_gptimer_intr(TIMER5_id);
|
|
|
|
/* tell the upper layers we took care of things */
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* ... random driver code ... */
|
|
|
|
static int __init gptimer_example_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* grab the peripheral pins */
|
|
ret = peripheral_request(P_TMR5, DRIVER_NAME);
|
|
if (ret) {
|
|
printk(KERN_NOTICE DRIVER_NAME ": peripheral request failed\n");
|
|
return ret;
|
|
}
|
|
|
|
/* grab the IRQ for the timer */
|
|
ret = request_irq(IRQ_TIMER5, gptimer_example_irq, IRQF_SHARED, DRIVER_NAME, &data);
|
|
if (ret) {
|
|
printk(KERN_NOTICE DRIVER_NAME ": IRQ request failed\n");
|
|
peripheral_free(P_TMR5);
|
|
return ret;
|
|
}
|
|
|
|
/* setup the timer and enable it */
|
|
set_gptimer_config(TIMER5_id, WDTH_CAP | PULSE_HI | PERIOD_CNT | IRQ_ENA);
|
|
enable_gptimers(TIMER5bit);
|
|
|
|
return 0;
|
|
}
|
|
module_init(gptimer_example_init);
|
|
|
|
static void __exit gptimer_example_exit(void)
|
|
{
|
|
disable_gptimers(TIMER5bit);
|
|
free_irq(IRQ_TIMER5, &data);
|
|
peripheral_free(P_TMR5);
|
|
}
|
|
module_exit(gptimer_example_exit);
|
|
|
|
MODULE_LICENSE("BSD");
|