mfd: cros_ec: Add fingerprint API

Add support for fingerprint sensors managed by embedded controller.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

include/linux/mfd/cros_ec_commands.h

@@ -3339,6 +3339,40 @@ struct ec_response_get_next_event_v1 {
 #define EC_MKBP_TABLET_MODE	1
 #define EC_MKBP_BASE_ATTACHED	2
 
+/* Fingerprint events in 'fp_events' for EC_MKBP_EVENT_FINGERPRINT */
+#define EC_MKBP_FP_RAW_EVENT(fp_events) ((fp_events) & 0x00FFFFFF)
+#define EC_MKBP_FP_ERRCODE(fp_events)   ((fp_events) & 0x0000000F)
+#define EC_MKBP_FP_ENROLL_PROGRESS_OFFSET 4
+#define EC_MKBP_FP_ENROLL_PROGRESS(fpe) (((fpe) & 0x00000FF0) \
+					 >> EC_MKBP_FP_ENROLL_PROGRESS_OFFSET)
+#define EC_MKBP_FP_MATCH_IDX_OFFSET 12
+#define EC_MKBP_FP_MATCH_IDX_MASK 0x0000F000
+#define EC_MKBP_FP_MATCH_IDX(fpe) (((fpe) & EC_MKBP_FP_MATCH_IDX_MASK) \
+					 >> EC_MKBP_FP_MATCH_IDX_OFFSET)
+#define EC_MKBP_FP_ENROLL               BIT(27)
+#define EC_MKBP_FP_MATCH                BIT(28)
+#define EC_MKBP_FP_FINGER_DOWN          BIT(29)
+#define EC_MKBP_FP_FINGER_UP            BIT(30)
+#define EC_MKBP_FP_IMAGE_READY          BIT(31)
+/* code given by EC_MKBP_FP_ERRCODE() when EC_MKBP_FP_ENROLL is set */
+#define EC_MKBP_FP_ERR_ENROLL_OK               0
+#define EC_MKBP_FP_ERR_ENROLL_LOW_QUALITY      1
+#define EC_MKBP_FP_ERR_ENROLL_IMMOBILE         2
+#define EC_MKBP_FP_ERR_ENROLL_LOW_COVERAGE     3
+#define EC_MKBP_FP_ERR_ENROLL_INTERNAL         5
+/* Can be used to detect if image was usable for enrollment or not. */
+#define EC_MKBP_FP_ERR_ENROLL_PROBLEM_MASK     1
+/* code given by EC_MKBP_FP_ERRCODE() when EC_MKBP_FP_MATCH is set */
+#define EC_MKBP_FP_ERR_MATCH_NO                0
+#define EC_MKBP_FP_ERR_MATCH_NO_INTERNAL       6
+#define EC_MKBP_FP_ERR_MATCH_NO_TEMPLATES      7
+#define EC_MKBP_FP_ERR_MATCH_NO_LOW_QUALITY    2
+#define EC_MKBP_FP_ERR_MATCH_NO_LOW_COVERAGE   4
+#define EC_MKBP_FP_ERR_MATCH_YES               1
+#define EC_MKBP_FP_ERR_MATCH_YES_UPDATED       3
+#define EC_MKBP_FP_ERR_MATCH_YES_UPDATE_FAILED 5
+
+
 /*****************************************************************************/
 /* Temperature sensor commands */