Messages in this thread | | | Date | Thu, 5 Jan 2006 23:27:05 +0100 | From | Dominik Brodowski <> | Subject | Re: [linux-pm] [patch] pm: fix runtime powermanagement's /sys interface |
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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...
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