cleanup: pd: Make PDO find / extract functions non-static

Allow other modules to call pd_find_pdo_index() / pd_extract_pdo_power()
in order to get information about current PDOs.

BUG=chromium:775542
TEST=Manual on kevin, verify 20V negotiation with zinger still works.
BRANCH=servo

Change-Id: I1861a0226501bda13e7d576d0971d841da9d2b74
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/724682
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

1 files changed, 23 insertions, 4 deletions

diff --git a/include/usb_pd.h b/include/usb_pd.h
index c1a9d0b063..f6354eb546 100644
--- a/include/usb_pd.h
+++ b/include/usb_pd.h
@@ -886,16 +886,15 @@ enum pd_request_type {
 /**
  * Decide which PDO to choose from the source capabilities.
  *
- * @param cnt  the number of Power Data Objects.
- * @param src_caps Power Data Objects representing the source capabilities.
+ * @param port USB-C port number
  * @param rdo  requested Request Data Object.
  * @param ma  selected current limit (stored on success)
  * @param mv  selected supply voltage (stored on success)
  * @param req_type request type
  * @return <0 if invalid, else EC_SUCCESS
  */
-int pd_build_request(int cnt, uint32_t *src_caps, uint32_t *rdo,
-		     uint32_t *ma, uint32_t *mv, enum pd_request_type req_type);
+int pd_build_request(int port, uint32_t *rdo, uint32_t *ma, uint32_t *mv,
+		     enum pd_request_type req_type);
 
 /**
  * Check if max voltage request is allowed (only used if
@@ -915,6 +914,26 @@ int pd_is_max_request_allowed(void);
 void pd_process_source_cap(int port, int cnt, uint32_t *src_caps);
 
 /**
+ * Find PDO index that offers the most amount of power and stays within
+ * max_mv voltage.
+ *
+ * @param port USB-C port number
+ * @param max_mv maximum voltage (or -1 if no limit)
+ * @param pdo raw pdo corresponding to index, or index 0 on error (output)
+ * @return index of PDO within source cap packet
+ */
+int pd_find_pdo_index(int port, int max_mv, uint32_t *pdo);
+
+/**
+ * Extract power information out of a Power Data Object (PDO)
+ *
+ * @param pdo raw pdo to extract
+ * @param ma current of the PDO (output)
+ * @param mv voltage of the PDO (output)
+ */
+void pd_extract_pdo_power(uint32_t pdo, uint32_t *ma, uint32_t *mv);
+
+/**
  * Reduce the sink power consumption to a minimum value.
  *
  * @param port USB-C port number