Messages in this thread | | | From | "Tomoya MORINAGA" <> | Subject | RE: About GPIO interrupt function with sysfs | Date | Wed, 2 Mar 2011 15:38:13 +0900 |
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Hi Grant,
On Friday, February 18, 2011 9:43 AM, Grant Likely wrote: > > Can our GPIO driver (pch_gpio) have interrupt function? > > yes. Need your help.
I try to add interrupt function to GPIO driver of Intel EG20T PCH(pch_gpio.c).
However, executing "echo xxx > export", there is not "edge" file in /sys/class/gpio/gpioxxx/.
Seeing source code in gpio_export@gpiolib.c, like below
int gpio_export(unsigned gpio, bool direction_may_change) { snip...
if (!status && gpio_to_irq(gpio) >= 0 && (direction_may_change || !test_bit(FLAG_IS_OUT, &desc->flags))) { status = device_create_file(dev, &dev_attr_edge); printk("%s:device_create_file!!! status=0x%x\n", __func__, status); }
snip... }
The above "device_create_file(dev, &dev_attr_edge);" is not executed.
Seeing gpio_to_irq@arch/x86/include/asm/gpio.h, like below.
static inline int gpio_to_irq(unsigned int gpio) { return -ENOSYS; }
Thus, device_create_file for "edge" is never executed.
Could you tell me how to create "edge" file ?
With Best Regards, ----------------------------------------- Tomoya MORINAGA OKI SEMICONDUCTOR CO., LTD.
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