Hi everyone !
I am currently updating the kernel of my company and I have some problems about gpios so I am asking you some help ! :) I think I am in the good mailist because it is the first time I update a kernel and a board configuration ! :D The previous kernel used was 2.6.31.14 and I am trying to update it to last stable version 3.7.9. In the previous kernel for a "home-made" board (with a IMx27 and a ARM9), we used these methods to export gpios in sysfs (for example for Gpio OUT) : mxc_gpio_mode(gpio_number | GPIO_GPIO | GPIO_OUT); gpio_request(gpio_number, name_of_gpio); gpio_export(gpio_number, 0); gpio_direction_output(gpio_number, gpio_value); In the sysfs, the gpio exported was visible under "name_of_gpio". Now, if I use the same methods, I can not get anything in sysfs except "gpiochip0, gpiochip32" etc. I tried to use these functions in a module and I could export a gpio but under "gpioXX" and not "name_of_gpio". Moreover, I tried to export a gpio using the sysfs interface. I succeeded to export it and set direction to "out" but when I try to set the value, it did not work and the value is always set to 0 (and this gpio was configured as OUT in the board). I make a diff about the gpio documentation and the old kernel used did not seem to have many differences with the new kernel ! There is only some methods added such as "gpio_resquest_one" and "gpio_export_link". I tried them without good results. What am I doing wrong ? What am I missing to make it work ? Is there some other configurations to add in the board configuration ? Thank you for any help/explanation ! -- Mylène JOSSERAND _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
