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    SubjectRe: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface
    On Thu, Jan 05, 2006 at 11:23:38PM +0100, Pavel Machek wrote:
    > > In addition, your patch breaks pcmcia / pcmciautils which already uses
    > > numbers (which I already had to change from "3" to "2" before...).
    >
    > pcmcia actually uses this? Ouch. Do you just read the power file, or
    > do you write to it, too?

    Reading and writing. Replacement for "cardctl suspend" and "cardctl resume".


    static int pccardctl_power_one(unsigned long socket_no, unsigned int device,
    unsigned int power)
    {
    int ret;
    char file[SYSFS_PATH_MAX];
    struct sysfs_attribute *attr;

    snprintf(file, SYSFS_PATH_MAX,
    "/sys/bus/pcmcia/devices/%lu.%u/power/state",
    socket_no, device);

    attr = sysfs_open_attribute(file);
    if (!attr)
    return -ENODEV;

    ret = sysfs_write_attribute(attr, power ? "2" : "0", 1);

    sysfs_close_attribute(attr);

    return (ret);
    }


    NB: it will break one day, one way or another, when gregkh makes the
    /sys/class -> /sys/devices conversion. However, I'd want to try not to break
    the new pcmciautils userspace too often...

    Dominik
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