x86/lguest/timer: Migrate to new set-state interface

Migrate lguest driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

We weren't doing anything while switching modes other than in shutdown
mode and so those are not implemented.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-and-tested-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: linaro-kernel@lists.linaro.org
Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: lguest@lists.ozlabs.org (open list:LGUEST)
Link: http://lkml.kernel.org/r/b96f1c308f4523255c5394a4e6e13f2b67685402.1437042675.git.viresh.kumar@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 18 deletions

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index f2dc08c003eb..433e5a7dd37f 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -985,23 +985,11 @@ static int lguest_clockevent_set_next_event(unsigned long delta,
         return 0;
 }
 
-static void lguest_clockevent_set_mode(enum clock_event_mode mode,
-                                      struct clock_event_device *evt)
-{
-        switch (mode) {
-        case CLOCK_EVT_MODE_UNUSED:
-        case CLOCK_EVT_MODE_SHUTDOWN:
-                /* A 0 argument shuts the clock down. */
-                hcall(LHCALL_SET_CLOCKEVENT, 0, 0, 0, 0);
-                break;
-        case CLOCK_EVT_MODE_ONESHOT:
-                /* This is what we expect. */
-                break;
-        case CLOCK_EVT_MODE_PERIODIC:
-                BUG();
-        case CLOCK_EVT_MODE_RESUME:
-                break;
-        }
+static int lguest_clockevent_shutdown(struct clock_event_device *evt)
+{
+        /* A 0 argument shuts the clock down. */
+        hcall(LHCALL_SET_CLOCKEVENT, 0, 0, 0, 0);
+        return 0;
 }
 
 /* This describes our primitive timer chip. */
@@ -1009,7 +997,7 @@ static struct clock_event_device lguest_clockevent = {
         .name                   = "lguest",
         .features               = CLOCK_EVT_FEAT_ONESHOT,
         .set_next_event         = lguest_clockevent_set_next_event,
-        .set_mode               = lguest_clockevent_set_mode,
+        .set_state_shutdown     = lguest_clockevent_shutdown,
         .rating                 = INT_MAX,
         .mult                   = 1,
         .shift                  = 0,