[PATCH 2/3] Mailbox : Added functionality to get power state

[Mudit Jain]

From: Mudit Jain <muditj at nvidia.com>

---
 c/src/lib/libbsp/arm/raspberrypi/include/vc.h      |  2 ++
 c/src/lib/libbsp/arm/raspberrypi/misc/vc.c         | 25 ++++++++++++++++++++++
 c/src/lib/libbsp/arm/raspberrypi/misc/vc_defines.h | 12 +++++++++++
 3 files changed, 39 insertions(+)

diff --git a/c/src/lib/libbsp/arm/raspberrypi/include/vc.h b/c/src/lib/libbsp/arm/raspberrypi/include/vc.h
index d3408f9..74f7557 100644
--- a/c/src/lib/libbsp/arm/raspberrypi/include/vc.h
+++ b/c/src/lib/libbsp/arm/raspberrypi/include/vc.h
@@ -106,6 +106,8 @@ typedef struct {
 #define BCM2835_MAILBOX_POWER_STATE_NODEV ( 1 << 1 )
 int bcm2835_mailbox_set_power_state( bcm2835_set_power_state_entries *_entries );
 
+int bcm2835_mailbox_get_power_state( bcm2835_set_power_state_entries *_entries );
+
 typedef struct {
   uint32_t base;
   size_t size;
diff --git a/c/src/lib/libbsp/arm/raspberrypi/misc/vc.c b/c/src/lib/libbsp/arm/raspberrypi/misc/vc.c
index 53ac1e8..c089b36 100644
--- a/c/src/lib/libbsp/arm/raspberrypi/misc/vc.c
+++ b/c/src/lib/libbsp/arm/raspberrypi/misc/vc.c
@@ -254,6 +254,31 @@ int bcm2835_mailbox_get_cmdline( bcm2835_get_cmdline_entries *_entries )
   return 0;
 }
 
+int bcm2835_mailbox_get_power_state( bcm2835_set_power_state_entries *_entries )
+{
+  struct {
+    bcm2835_mbox_buf_hdr hdr;
+    bcm2835_mbox_tag_get_power_state get_power_state;
+    uint32_t end_tag;
+  } buffer BCM2835_MBOX_BUF_ALIGN_ATTRIBUTE;
+  BCM2835_MBOX_INIT_BUF( &buffer );
+  BCM2835_MBOX_INIT_TAG( &buffer.get_power_state,
+    BCM2835_MAILBOX_TAG_GET_POWER_STATE );
+  buffer.get_power_state.body.req.dev_id = _entries->dev_id;
+  bcm2835_mailbox_buffer_flush_and_invalidate( &buffer, sizeof( &buffer ) );
+
+  if ( bcm2835_mailbox_send_read_buffer( &buffer ) )
+    return -1;
+
+  _entries->dev_id = buffer.get_power_state.body.resp.dev_id;
+  _entries->state = buffer.get_power_state.body.resp.state;
+
+  if ( !bcm2835_mailbox_buffer_suceeded( &buffer.hdr ) )
+    return -2;
+
+  return 0;
+}
+
 int bcm2835_mailbox_set_power_state( bcm2835_set_power_state_entries *_entries )
 {
   struct {
diff --git a/c/src/lib/libbsp/arm/raspberrypi/misc/vc_defines.h b/c/src/lib/libbsp/arm/raspberrypi/misc/vc_defines.h
index 516f8f4..e1a5a5b 100644
--- a/c/src/lib/libbsp/arm/raspberrypi/misc/vc_defines.h
+++ b/c/src/lib/libbsp/arm/raspberrypi/misc/vc_defines.h
@@ -246,6 +246,18 @@ typedef struct {
 #define BCM2835_MAILBOX_POWER_UDID_CCP2TX            0x00000008
 
 #define BCM2835_MAILBOX_TAG_GET_POWER_STATE     0x00020001
+typedef struct {
+  bcm2835_mbox_tag_hdr tag_hdr;
+  union {
+    struct {
+      uint32_t dev_id;
+    } req;
+    struct {
+      uint32_t dev_id;
+      uint32_t state;
+    } resp;
+  } body;
+} bcm2835_mbox_tag_get_power_state;
 
 #define BCM2835_MAILBOX_POWER_STATE_RESP_ON       (1 << 0)
 #define BCM2835_MAILBOX_POWER_STATE_RESP_NODEV    (1 << 1)
-- 
1.9.1