[PATCH v3 26/30] mfd: cros_ec: Add API for Fingerprint support

Gwendal Grignou
2019-05-09T21:14:49Z

Add API for fingerprint sensor presented by embedded controller.

Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
include/linux/mfd/cros_ec_commands.h | 228 +++++++++++++++++++++++++++
1 file changed, 228 insertions(+)

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 1d0311df44d3..4a9ac3861bdd 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -5043,6 +5043,234 @@ struct ec_response_pd_chip_info_v1 {
};
} __ec_align2;

+/*****************************************************************************/
+/* Fingerprint MCU commands: range 0x0400-0x040x */
+
+/* Fingerprint SPI sensor passthru command: prototyping ONLY */
+#define EC_CMD_FP_PASSTHRU 0x0400
+
+#define EC_FP_FLAG_NOT_COMPLETE 0x1
+
+struct ec_params_fp_passthru {
+ uint16_t len; /* Number of bytes to write then read */
+ uint16_t flags; /* EC_FP_FLAG_xxx */
+ uint8_t data[]; /* Data to send */
+} __ec_align2;
+
+/* Configure the Fingerprint MCU behavior */
+#define EC_CMD_FP_MODE 0x0402
+
+/* Put the sensor in its lowest power mode */
+#define FP_MODE_DEEPSLEEP BIT(0)
+/* Wait to see a finger on the sensor */
+#define FP_MODE_FINGER_DOWN BIT(1)
+/* Poll until the finger has left the sensor */
+#define FP_MODE_FINGER_UP BIT(2)
+/* Capture the current finger image */
+#define FP_MODE_CAPTURE BIT(3)
+/* Finger enrollment session on-going */
+#define FP_MODE_ENROLL_SESSION BIT(4)
+/* Enroll the current finger image */
+#define FP_MODE_ENROLL_IMAGE BIT(5)
+/* Try to match the current finger image */
+#define FP_MODE_MATCH BIT(6)
+/* Reset and re-initialize the sensor. */
+#define FP_MODE_RESET_SENSOR BIT(7)
+/* special value: don't change anything just read back current mode */
+#define FP_MODE_DONT_CHANGE BIT(31)
+
+#define FP_VALID_MODES (FP_MODE_DEEPSLEEP | \
+ FP_MODE_FINGER_DOWN | \
+ FP_MODE_FINGER_UP | \
+ FP_MODE_CAPTURE | \
+ FP_MODE_ENROLL_SESSION | \
+ FP_MODE_ENROLL_IMAGE | \
+ FP_MODE_MATCH | \
+ FP_MODE_RESET_SENSOR | \
+ FP_MODE_DONT_CHANGE)
+
+/* Capture types defined in bits [30..28] */
+#define FP_MODE_CAPTURE_TYPE_SHIFT 28
+#define FP_MODE_CAPTURE_TYPE_MASK (0x7 << FP_MODE_CAPTURE_TYPE_SHIFT)
+/*
+ * This enum must remain ordered, if you add new values you must ensure that
+ * FP_CAPTURE_TYPE_MAX is still the last one.
+ */
+enum fp_capture_type {
+ /* Full blown vendor-defined capture (produces 'frame_size' bytes) */
+ FP_CAPTURE_VENDOR_FORMAT = 0,
+ /* Simple raw image capture (produces width x height x bpp bits) */
+ FP_CAPTURE_SIMPLE_IMAGE = 1,
+ /* Self test pattern (e.g. checkerboard) */
+ FP_CAPTURE_PATTERN0 = 2,
+ /* Self test pattern (e.g. inverted checkerboard) */
+ FP_CAPTURE_PATTERN1 = 3,
+ /* Capture for Quality test with fixed contrast */
+ FP_CAPTURE_QUALITY_TEST = 4,
+ /* Capture for pixel reset value test */
+ FP_CAPTURE_RESET_TEST = 5,
+ FP_CAPTURE_TYPE_MAX,
+};
+/* Extracts the capture type from the sensor 'mode' word */
+#define FP_CAPTURE_TYPE(mode) (((mode) & FP_MODE_CAPTURE_TYPE_MASK) \
+ >> FP_MODE_CAPTURE_TYPE_SHIFT)
+
+struct ec_params_fp_mode {
+ uint32_t mode; /* as defined by FP_MODE_ constants */
+} __ec_align4;
+
+struct ec_response_fp_mode {
+ uint32_t mode; /* as defined by FP_MODE_ constants */
+} __ec_align4;
+
+/* Retrieve Fingerprint sensor information */
+#define EC_CMD_FP_INFO 0x0403
+
+/* Number of dead pixels detected on the last maintenance */
+#define FP_ERROR_DEAD_PIXELS(errors) ((errors) & 0x3FF)
+/* Unknown number of dead pixels detected on the last maintenance */
+#define FP_ERROR_DEAD_PIXELS_UNKNOWN (0x3FF)
+/* No interrupt from the sensor */
+#define FP_ERROR_NO_IRQ BIT(12)
+/* SPI communication error */
+#define FP_ERROR_SPI_COMM BIT(13)
+/* Invalid sensor Hardware ID */
+#define FP_ERROR_BAD_HWID BIT(14)
+/* Sensor initialization failed */
+#define FP_ERROR_INIT_FAIL BIT(15)
+
+struct ec_response_fp_info_v0 {
+ /* Sensor identification */
+ uint32_t vendor_id;
+ uint32_t product_id;
+ uint32_t model_id;
+ uint32_t version;
+ /* Image frame characteristics */
+ uint32_t frame_size;
+ uint32_t pixel_format; /* using V4L2_PIX_FMT_ */
+ uint16_t width;
+ uint16_t height;
+ uint16_t bpp;
+ uint16_t errors; /* see FP_ERROR_ flags above */
+} __ec_align4;
+
+struct ec_response_fp_info {
+ /* Sensor identification */
+ uint32_t vendor_id;
+ uint32_t product_id;
+ uint32_t model_id;
+ uint32_t version;
+ /* Image frame characteristics */
+ uint32_t frame_size;
+ uint32_t pixel_format; /* using V4L2_PIX_FMT_ */
+ uint16_t width;
+ uint16_t height;
+ uint16_t bpp;
+ uint16_t errors; /* see FP_ERROR_ flags above */
+ /* Template/finger current information */
+ uint32_t template_size; /* max template size in bytes */
+ uint16_t template_max; /* maximum number of fingers/templates */
+ uint16_t template_valid; /* number of valid fingers/templates */
+ uint32_t template_dirty; /* bitmap of templates with MCU side changes */
+ uint32_t template_version; /* version of the template format */
+} __ec_align4;
+
+/* Get the last captured finger frame or a template content */
+#define EC_CMD_FP_FRAME 0x0404
+
+/* constants defining the 'offset' field which also contains the frame index */
+#define FP_FRAME_INDEX_SHIFT 28
+/* Frame buffer where the captured image is stored */
+#define FP_FRAME_INDEX_RAW_IMAGE 0
+/* First frame buffer holding a template */
+#define FP_FRAME_INDEX_TEMPLATE 1
+#define FP_FRAME_GET_BUFFER_INDEX(offset) ((offset) >> FP_FRAME_INDEX_SHIFT)
+#define FP_FRAME_OFFSET_MASK 0x0FFFFFFF
+
+/* Version of the format of the encrypted templates. */
+#define FP_TEMPLATE_FORMAT_VERSION 3
+
+/* Constants for encryption parameters */
+#define FP_CONTEXT_NONCE_BYTES 12
+#define FP_CONTEXT_USERID_WORDS (32 / sizeof(uint32_t))
+#define FP_CONTEXT_TAG_BYTES 16
+#define FP_CONTEXT_SALT_BYTES 16
+#define FP_CONTEXT_TPM_BYTES 32
+
+struct ec_fp_template_encryption_metadata {
+ /*
+ * Version of the structure format (N=3).
+ */
+ uint16_t struct_version;
+ /* Reserved bytes, set to 0. */
+ uint16_t reserved;
+ /*
+ * The salt is *only* ever used for key derivation. The nonce is unique,
+ * a different one is used for every message.
+ */
+ uint8_t nonce[FP_CONTEXT_NONCE_BYTES];
+ uint8_t salt[FP_CONTEXT_SALT_BYTES];
+ uint8_t tag[FP_CONTEXT_TAG_BYTES];
+};
+
+struct ec_params_fp_frame {
+ /*
+ * The offset contains the template index or FP_FRAME_INDEX_RAW_IMAGE
+ * in the high nibble, and the real offset within the frame in
+ * FP_FRAME_OFFSET_MASK.
+ */
+ uint32_t offset;
+ uint32_t size;
+} __ec_align4;
+
+/* Load a template into the MCU */
+#define EC_CMD_FP_TEMPLATE 0x0405
+
+/* Flag in the 'size' field indicating that the full template has been sent */
+#define FP_TEMPLATE_COMMIT 0x80000000
+
+struct ec_params_fp_template {
+ uint32_t offset;
+ uint32_t size;
+ uint8_t data[];
+} __ec_align4;
+
+/* Clear the current fingerprint user context and set a new one */
+#define EC_CMD_FP_CONTEXT 0x0406
+
+struct ec_params_fp_context {
+ uint32_t userid[FP_CONTEXT_USERID_WORDS];
+} __ec_align4;
+
+#define EC_CMD_FP_STATS 0x0407
+
+#define FPSTATS_CAPTURE_INV BIT(0)
+#define FPSTATS_MATCHING_INV BIT(1)
+
+struct ec_response_fp_stats {
+ uint32_t capture_time_us;
+ uint32_t matching_time_us;
+ uint32_t overall_time_us;
+ struct {
+ uint32_t lo;
+ uint32_t hi;
+ } overall_t0;
+ uint8_t timestamps_invalid;
+ int8_t template_matched;
+} __ec_align2;
+
+#define EC_CMD_FP_SEED 0x0408
+struct ec_params_fp_seed {
+ /*
+ * Version of the structure format (N=3).
+ */
+ uint16_t struct_version;
+ /* Reserved bytes, set to 0. */
+ uint16_t reserved;
+ /* Seed from the TPM. */
+ uint8_t seed[FP_CONTEXT_TPM_BYTES];
+} __ec_align4;
+
/*****************************************************************************/
/* Touchpad MCU commands: range 0x0500-0x05FF */

--
2.21.0.1020.gf2820cf01a-goog