Hi experts, I have trouble about interrupt. I need low level trigger the interrupt. My control flow is that when data is less than a threshold, it needs keeping interrupt until data is supplied.
So I use the flag `IRQ_TYPE_LEVEL_LOW `, but it doesn’t work. I have also tried `IRQF_TRIGGER_LOW`, it also doesn’t work. I have checked the hardware register, the interrupt GPIO is still `falling edges`, not `low level`. My board is ARM S3C6410 tiny board. 221 /* inkprinter */ 222 #define S3C64XX_PA_INKPRINTER (0x30000000) 223 #define S3C64XX_SZ_INKPRINTER SZ_1M 224 static struct resource inkprinter_resources[] = { 225 [0] = { 226 .start = S3C64XX_PA_INKPRINTER, 227 .end = S3C64XX_PA_INKPRINTER + S3C64XX_SZ_INKPRINTER, 228 .flags = IORESOURCE_MEM, 229 }, 230 [1] = { 231 .start = IRQ_EINT(1), 232 .end = IRQ_EINT(1), 233 .flags = IORESOURCE_IRQ | IRQ_TYPE_LEVEL_LOW, 234 } 235 }; 236 static struct platform_device s3c_device_inkprinter = { 237 .name = "inkprinter", 238 .num_resources = ARRAY_SIZE(inkprinter_resources), 239 .resource = inkprinter_resources, 240 }; 241 My question is : Is `IRQ_TYPE_LEVEL_LOW ` or `IRQF_TRIGGER_LOW ` for low level trigger? Or some other problem? Any tips? Your response will be highly appreciated. Thanks, /Alex-- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/