hello! I have AIMB 210 motherboard with PCA9555 gpio chipset: $ uname -a Linux 3.4.7 #14 SMP i686 GNU/Linux I compiled the PCA953x driver, but failed to run it: # echo pca9555 0x20 > /sys/bus/i2c/devices/i2c-0/new_device pca953x: 0-0020: failed to request irq 0 pca953x: probe of 0-0020 failed with error -16 i2c i2c-0: new_device: Instantiated device pca9555 at 0x20 # ls /sys/class/gpio export unexport I started to dig into the driver, and when disabling interrupt by seting pca953x_probe variable irq_base to -1: int irq_base = -1; I got this: # echo pca9555 0x20 > /sys/bus/i2c/devices/i2c-0/new_device gpiochip_add: registered GPIOs 240 to 255 on device: pca9555 i2c i2c-0: new_device: Instantiated device pca9555 at 0x20 # ls /sys/class/gpio/gpiochip240 export gpiochip240 unexport # ls /sys/class/gpio/gpiochip240 base device label gpio power/ subsystem uevent There is lack of gpio folder, where I could read/write gpio values. So it seems like, interrupt code is buggy. I dont use FDT, so I dont have interrupts property. Since, I'm not fluent with linux device drivers, I ask for some help. It seems like, there is a bug in pca953x_irq_setup() (the one for IRQ enabled) irq_alloc_descs() from line 498 returns 50, so I suppose, the first interrupt to allocate should be 50, not 0. PS: I have kernel 3.4.7, but I copied the driver source from latest git tree: https://github.com/mirrors/linux-2.6/commit/ca3ffe910f9935d24e02bb5628a8cbcab119fd9a#drivers/gpio/gpio-pca953x.c https://github.com/mirrors/linux-2.6/blob/6a7b36aa4b0afbe7a9798feac16de47ad856f358/include/linux/i2c/pca953x.h thanks in advance Aleksander D. -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
