greybus: svc: add AP power measurements debugfs support

This change adds the AP Power Monitor functions to
read out all the rails power information monitored by
the SVC.

Testing Done:
- $ cat /d/greybus/1-svc/pwrmon/*/*
  and validate the output with the svc stub power
  monitor functions
- $ tree /d/greybus/1-svc/pwrmon
  | | | |---pwrmon
  | | | | |---DUMMY_RAIL_1
  | | | | | |---current_now
  | | | | | |---power_now
  | | | | | |---voltage_now
  | | | | |---DUMMY_RAIL_2
  | | | | | |---current_now
  | | | | | |---power_now
  | | | | | |---voltage_now
  | | | | |---DUMMY_RAIL_3
  | | | | | |---current_now
  | | | | | |---power_now
  | | | | | |---voltage_now
  | | | | |---DUMMY_RAIL_4
  | | | | | |---current_now
  | | | | | |---power_now
  | | | | | |---voltage_now

Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/staging/greybus/svc.h b/drivers/staging/greybus/svc.h
index 08f8e3705b43..72bc716bf2fe 100644
--- a/drivers/staging/greybus/svc.h
+++ b/drivers/staging/greybus/svc.h
@@ -22,6 +22,11 @@ enum gb_svc_state {
 
 struct gb_svc_watchdog;
 
+struct svc_debugfs_pwrmon_rail {
+	u8 id;
+	struct gb_svc *svc;
+};
+
 struct gb_svc {
 	struct device		dev;
 
@@ -40,6 +45,11 @@ struct gb_svc {
 	struct input_dev        *input;
 	char                    *input_phys;
 	struct gb_svc_watchdog	*watchdog;
+
+	struct dentry *debugfs_dentry;
+	struct svc_debugfs_pwrmon_rail *pwrmon_rails;
+	struct gb_svc_pwrmon_rail_names_get_response *rail_names;
+	u8 rail_count;
 };
 #define to_gb_svc(d) container_of(d, struct gb_svc, dev)