[S390] pm: chsc subchannel driver power management callbacks (ad285ae9) · Commits · e / devices / android_kernel_teracube_emerald

drivers/s390/cio/chsc_sch.c

+31 −1

Original line number	Diff line number	Diff line
		/*
		* Driver for s390 chsc subchannels
		*
		* Copyright IBM Corp. 2008
		* Copyright IBM Corp. 2008, 2009
		*
		* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
		*
		*/
		@@ -112,6 +113,31 @@ static void chsc_subchannel_shutdown(struct subchannel *sch)
		cio_disable_subchannel(sch);
		}

		static int chsc_subchannel_prepare(struct subchannel *sch)
		{
		int cc;
		struct schib schib;
		/*
		* Don't allow suspend while the subchannel is not idle
		* since we don't have a way to clear the subchannel and
		* cannot disable it with a request running.
		*/
		cc = stsch(sch->schid, &schib);
		if (!cc && scsw_stctl(&schib.scsw))
		return -EAGAIN;
		return 0;
		}

		static int chsc_subchannel_freeze(struct subchannel *sch)
		{
		return cio_disable_subchannel(sch);
		}

		static int chsc_subchannel_restore(struct subchannel *sch)
		{
		return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
		}

		static struct css_device_id chsc_subchannel_ids[] = {
		{ .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
		{ /* end of list */ },
		@@ -125,6 +151,10 @@ static struct css_driver chsc_subchannel_driver = {
		.probe = chsc_subchannel_probe,
		.remove = chsc_subchannel_remove,
		.shutdown = chsc_subchannel_shutdown,
		.prepare = chsc_subchannel_prepare,
		.freeze = chsc_subchannel_freeze,
		.thaw = chsc_subchannel_restore,
		.restore = chsc_subchannel_restore,
		.name = "chsc_subchannel",
		};