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Add Elan driver
This commit is contained in:
Igor Filatov
630
libfprint/drivers/elan.c
Normal file
630
libfprint/drivers/elan.c
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@@ -0,0 +1,630 @@
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/*
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* Elan driver for libfprint
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*
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* Copyright (C) 2017 Igor Filatov <ia.filatov@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define FP_COMPONENT "elan"
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#include <errno.h>
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#include <libusb.h>
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#include <assembling.h>
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#include <fp_internal.h>
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#include <fprint.h>
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#include "elan.h"
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#include "driver_ids.h"
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unsigned char elan_get_pixel(struct fpi_frame_asmbl_ctx *ctx,
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struct fpi_frame *frame, unsigned int x,
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unsigned int y)
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{
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return frame->data[x + y * ctx->frame_width];
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}
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static struct fpi_frame_asmbl_ctx assembling_ctx = {
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.frame_width = 0,
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.frame_height = 0,
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.image_width = 0,
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.get_pixel = elan_get_pixel,
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};
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struct elan_dev {
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gboolean deactivating;
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const struct elan_cmd *cmds;
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size_t cmds_len;
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int cmd_idx;
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int cmd_timeout;
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struct libusb_transfer *cur_transfer;
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unsigned char *last_read;
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unsigned char frame_width;
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unsigned char frame_height;
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unsigned char raw_frame_width;
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int num_frames;
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GSList *frames;
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};
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static void elan_dev_reset(struct elan_dev *elandev)
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{
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fp_dbg("");
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BUG_ON(elandev->cur_transfer);
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elandev->deactivating = FALSE;
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elandev->cmds = NULL;
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elandev->cmd_idx = 0;
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elandev->cmd_timeout = ELAN_CMD_TIMEOUT;
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g_free(elandev->last_read);
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elandev->last_read = NULL;
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g_slist_free_full(elandev->frames, g_free);
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elandev->frames = NULL;
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elandev->num_frames = 0;
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}
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static void elan_save_frame(struct fp_img_dev *dev)
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{
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struct elan_dev *elandev = dev->priv;
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unsigned char raw_height = elandev->frame_width;
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unsigned char raw_width = elandev->raw_frame_width;
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unsigned short *frame =
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g_malloc(elandev->frame_width * elandev->frame_height * 2);
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fp_dbg("");
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/* Raw images are vertical and perpendicular to swipe direction of a
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* normalized image, which means we need to make them horizontal before
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* assembling. We also discard stirpes of ELAN_FRAME_MARGIN along raw
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* height. */
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for (int y = 0; y < raw_height; y++)
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for (int x = ELAN_FRAME_MARGIN;
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x < raw_width - ELAN_FRAME_MARGIN; x++) {
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int frame_idx =
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y + (x - ELAN_FRAME_MARGIN) * raw_height;
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int raw_idx = x + y * raw_width;
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frame[frame_idx] =
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((unsigned short *)elandev->last_read)[raw_idx];
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}
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elandev->frames = g_slist_prepend(elandev->frames, frame);
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elandev->num_frames += 1;
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}
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/* Transform raw sesnsor data to normalized 8-bit grayscale image. */
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static void elan_process_frame(unsigned short *raw_frame, GSList ** frames)
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{
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unsigned int frame_size =
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assembling_ctx.frame_width * assembling_ctx.frame_height;
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struct fpi_frame *frame =
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g_malloc(frame_size + sizeof(struct fpi_frame));
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fp_dbg("");
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unsigned short min = 0xffff, max = 0;
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for (int i = 0; i < frame_size; i++) {
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if (raw_frame[i] < min)
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min = raw_frame[i];
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if (raw_frame[i] > max)
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max = raw_frame[i];
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}
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unsigned short px;
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for (int i = 0; i < frame_size; i++) {
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px = raw_frame[i];
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if (px <= min)
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px = 0;
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else if (px >= max)
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px = 0xff;
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else
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px = (px - min) * 0xff / (max - min);
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frame->data[i] = (unsigned char)px;
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}
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*frames = g_slist_prepend(*frames, frame);
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}
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static void elan_submit_image(struct fp_img_dev *dev)
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{
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struct elan_dev *elandev = dev->priv;
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GSList *frames = NULL;
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struct fp_img *img;
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fp_dbg("");
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for (int i = 0; i < ELAN_SKIP_LAST_FRAMES; i++)
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elandev->frames = g_slist_next(elandev->frames);
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assembling_ctx.frame_width = elandev->frame_width;
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assembling_ctx.frame_height = elandev->frame_height;
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assembling_ctx.image_width = elandev->frame_width * 3 / 2;
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g_slist_foreach(elandev->frames, (GFunc) elan_process_frame, &frames);
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fpi_do_movement_estimation(&assembling_ctx, frames,
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elandev->num_frames - ELAN_SKIP_LAST_FRAMES);
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img = fpi_assemble_frames(&assembling_ctx, frames,
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elandev->num_frames - ELAN_SKIP_LAST_FRAMES);
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img->flags |= FP_IMG_PARTIAL;
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fpi_imgdev_image_captured(dev, img);
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}
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static void elan_cmd_done(struct fpi_ssm *ssm)
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{
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
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elandev->cmd_idx += 1;
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if (elandev->cmd_idx < elandev->cmds_len)
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elan_run_next_cmd(ssm);
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else
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fpi_ssm_next_state(ssm);
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}
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static void elan_cmd_cb(struct libusb_transfer *transfer)
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{
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struct fpi_ssm *ssm = transfer->user_data;
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
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elandev->cur_transfer = NULL;
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switch (transfer->status) {
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case LIBUSB_TRANSFER_COMPLETED:
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if (transfer->length != transfer->actual_length) {
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fp_dbg("unexpected transfer length");
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elan_dev_reset(elandev);
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fpi_ssm_mark_aborted(ssm, -EPROTO);
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} else if (transfer->endpoint & LIBUSB_ENDPOINT_IN)
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/* just finished receiving */
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elan_cmd_done(ssm);
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else {
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/* just finished sending */
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if (elandev->cmds[elandev->cmd_idx].response_len)
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elan_cmd_read(ssm);
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else
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elan_cmd_done(ssm);
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}
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break;
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case LIBUSB_TRANSFER_CANCELLED:
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fp_dbg("transfer cancelled");
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fpi_ssm_mark_aborted(ssm, -ECANCELED);
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break;
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case LIBUSB_TRANSFER_TIMED_OUT:
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fp_dbg("transfer timed out");
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// elan_dev_reset(elandev);
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fpi_ssm_mark_aborted(ssm, -ETIMEDOUT);
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break;
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default:
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fp_dbg("transfer failed: %d", transfer->status);
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elan_dev_reset(elandev);
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fpi_ssm_mark_aborted(ssm, -EIO);
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}
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}
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static void elan_cmd_read(struct fpi_ssm *ssm)
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{
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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int response_len = elandev->cmds[elandev->cmd_idx].response_len;
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fp_dbg("");
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if (elandev->cmds[elandev->cmd_idx].cmd == read_cmds[0].cmd)
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/* raw data has 2-byte "pixels" and the frame is vertical */
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response_len =
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elandev->raw_frame_width * elandev->frame_width * 2;
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struct libusb_transfer *transfer = libusb_alloc_transfer(0);
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if (!transfer) {
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fpi_ssm_mark_aborted(ssm, -ENOMEM);
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return;
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}
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elandev->cur_transfer = transfer;
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g_free(elandev->last_read);
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elandev->last_read = g_malloc(response_len);
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libusb_fill_bulk_transfer(transfer, dev->udev,
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elandev->cmds[elandev->cmd_idx].response_in,
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elandev->last_read, response_len, elan_cmd_cb,
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ssm, elandev->cmd_timeout);
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transfer->flags = LIBUSB_TRANSFER_FREE_TRANSFER;
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int r = libusb_submit_transfer(transfer);
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if (r < 0)
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fpi_ssm_mark_aborted(ssm, r);
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}
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static void elan_run_next_cmd(struct fpi_ssm *ssm)
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{
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
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struct libusb_transfer *transfer = libusb_alloc_transfer(0);
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if (!transfer) {
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fpi_ssm_mark_aborted(ssm, -ENOMEM);
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return;
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}
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elandev->cur_transfer = transfer;
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libusb_fill_bulk_transfer(transfer, dev->udev, ELAN_EP_CMD_OUT,
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(unsigned char *)elandev->cmds[elandev->
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cmd_idx].cmd,
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ELAN_CMD_LEN, elan_cmd_cb, ssm,
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elandev->cmd_timeout);
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transfer->flags = LIBUSB_TRANSFER_FREE_TRANSFER;
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int r = libusb_submit_transfer(transfer);
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if (r < 0)
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fpi_ssm_mark_aborted(ssm, r);
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}
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static void elan_run_cmds(struct fpi_ssm *ssm, const struct elan_cmd *cmds,
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size_t cmds_len, int cmd_timeout)
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{
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
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elandev->cmds = cmds;
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elandev->cmds_len = cmds_len;
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elandev->cmd_idx = 0;
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if (cmd_timeout != -1)
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elandev->cmd_timeout = cmd_timeout;
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elan_run_next_cmd(ssm);
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}
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enum deactivate_states {
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DEACTIVATE,
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DEACTIVATE_NUM_STATES,
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};
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static void elan_deactivate_run_state(struct fpi_ssm *ssm)
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{
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switch (ssm->cur_state) {
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case DEACTIVATE:
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elan_run_cmds(ssm, deactivate_cmds, deactivate_cmds_len,
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ELAN_CMD_TIMEOUT);
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break;
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}
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}
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static void deactivate_complete(struct fpi_ssm *ssm)
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{
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struct fp_img_dev *dev = ssm->priv;
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fpi_imgdev_deactivate_complete(dev);
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}
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static void elan_deactivate(struct fp_img_dev *dev)
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{
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
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elan_dev_reset(elandev);
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struct fpi_ssm *ssm = fpi_ssm_new(dev->dev, elan_deactivate_run_state,
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DEACTIVATE_NUM_STATES);
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ssm->priv = dev;
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fpi_ssm_start(ssm, deactivate_complete);
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}
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enum capture_states {
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CAPTURE_START,
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CAPTURE_WAIT_FINGER,
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CAPTURE_READ_DATA,
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CAPTURE_SAVE_FRAME,
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CAPTURE_NUM_STATES,
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};
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static void elan_capture_run_state(struct fpi_ssm *ssm)
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{
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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switch (ssm->cur_state) {
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case CAPTURE_START:
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elan_run_cmds(ssm, capture_start_cmds, capture_start_cmds_len,
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ELAN_CMD_TIMEOUT);
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break;
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case CAPTURE_WAIT_FINGER:
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elan_run_cmds(ssm, capture_wait_finger_cmds,
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capture_wait_finger_cmds_len, -1);
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break;
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case CAPTURE_READ_DATA:
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/* 0x55 - finger present
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* 0xff - device not calibrated */
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if (elandev->last_read && elandev->last_read[0] == 0x55) {
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fpi_imgdev_report_finger_status(dev, TRUE);
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elan_run_cmds(ssm, read_cmds, read_cmds_len,
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ELAN_CMD_TIMEOUT);
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} else
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fpi_ssm_mark_aborted(ssm, FP_VERIFY_RETRY);
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break;
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case CAPTURE_SAVE_FRAME:
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elan_save_frame(dev);
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if (elandev->num_frames < ELAN_MAX_FRAMES) {
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/* quickly stop if finger is removed */
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elandev->cmd_timeout = ELAN_FINGER_TIMEOUT;
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fpi_ssm_jump_to_state(ssm, CAPTURE_WAIT_FINGER);
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}
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break;
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}
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}
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static void elan_capture_async(void *data)
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{
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elan_capture((struct fp_img_dev *)data);
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}
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static void capture_complete(struct fpi_ssm *ssm)
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{
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struct fp_img_dev *dev = ssm->priv;
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
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if (elandev->deactivating)
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elan_deactivate(dev);
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/* either max frames captured or timed out waiting for the next frame */
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else if (!ssm->error
|
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|| (ssm->error == -ETIMEDOUT
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&& ssm->cur_state == CAPTURE_WAIT_FINGER))
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if (elandev->num_frames >= ELAN_MIN_FRAMES) {
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elan_submit_image(dev);
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fpi_imgdev_report_finger_status(dev, FALSE);
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} else
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fpi_imgdev_session_error(dev,
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FP_VERIFY_RETRY_TOO_SHORT);
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/* other error
|
||||
* It says "...session_error" but repotring 1 during verification
|
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* makes it successful! */
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else
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fpi_imgdev_session_error(dev, FP_VERIFY_NO_MATCH);
|
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|
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/* When enrolling the lib won't restart the capture after a stage has
|
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* completed, so we need to keep feeding it images till it's had enough.
|
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* But after that it can't finalize enrollemnt until this callback exits.
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* That's why we schedule elan_capture instead of running it directly. */
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if (dev->dev->state == DEV_STATE_ENROLLING
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&& !fpi_timeout_add(10, elan_capture_async, dev))
|
||||
fpi_imgdev_session_error(dev, -ETIME);
|
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|
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fpi_ssm_free(ssm);
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}
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static void elan_capture(struct fp_img_dev *dev)
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{
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struct elan_dev *elandev = dev->priv;
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fp_dbg("");
|
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|
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elan_dev_reset(elandev);
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struct fpi_ssm *ssm =
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fpi_ssm_new(dev->dev, elan_capture_run_state, CAPTURE_NUM_STATES);
|
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ssm->priv = dev;
|
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fpi_ssm_start(ssm, capture_complete);
|
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}
|
||||
|
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enum calibrate_states {
|
||||
CALIBRATE_START_1,
|
||||
CALIBRATE_READ_DATA_1,
|
||||
CALIBRATE_END_1,
|
||||
CALIBRATE_START_2,
|
||||
CALIBRATE_READ_DATA_2,
|
||||
CALIBRATE_END_2,
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||||
CALIBRATE_NUM_STATES,
|
||||
};
|
||||
|
||||
static void elan_calibrate_run_state(struct fpi_ssm *ssm)
|
||||
{
|
||||
switch (ssm->cur_state) {
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||||
case CALIBRATE_START_1:
|
||||
case CALIBRATE_START_2:
|
||||
elan_run_cmds(ssm, calibrate_start_cmds,
|
||||
calibrate_start_cmds_len, ELAN_CMD_TIMEOUT);
|
||||
break;
|
||||
case CALIBRATE_READ_DATA_1:
|
||||
case CALIBRATE_READ_DATA_2:
|
||||
elan_run_cmds(ssm, read_cmds, read_cmds_len, ELAN_CMD_TIMEOUT);
|
||||
break;
|
||||
case CALIBRATE_END_1:
|
||||
case CALIBRATE_END_2:
|
||||
elan_run_cmds(ssm, calibrate_end_cmds, calibrate_end_cmds_len,
|
||||
ELAN_CMD_TIMEOUT);
|
||||
}
|
||||
}
|
||||
|
||||
static void calibrate_complete(struct fpi_ssm *ssm)
|
||||
{
|
||||
struct fp_img_dev *dev = ssm->priv;
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
if (elandev->deactivating)
|
||||
elan_deactivate(dev);
|
||||
else if (ssm->error)
|
||||
fpi_imgdev_session_error(dev, ssm->error);
|
||||
else {
|
||||
fpi_imgdev_activate_complete(dev, ssm->error);
|
||||
elan_capture(dev);
|
||||
}
|
||||
fpi_ssm_free(ssm);
|
||||
}
|
||||
|
||||
static void elan_calibrate(struct fp_img_dev *dev)
|
||||
{
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
elan_dev_reset(elandev);
|
||||
struct fpi_ssm *ssm = fpi_ssm_new(dev->dev, elan_calibrate_run_state,
|
||||
CALIBRATE_NUM_STATES);
|
||||
ssm->priv = dev;
|
||||
fpi_ssm_start(ssm, calibrate_complete);
|
||||
}
|
||||
|
||||
enum activate_states {
|
||||
ACTIVATE_GET_SENSOR_DIM,
|
||||
ACTIVATE_SET_SENSOR_DIM,
|
||||
ACTIVATE_START,
|
||||
ACTIVATE_READ_DATA,
|
||||
ACTIVATE_END,
|
||||
ACTIVATE_NUM_STATES,
|
||||
};
|
||||
|
||||
static void elan_activate_run_state(struct fpi_ssm *ssm)
|
||||
{
|
||||
struct fp_img_dev *dev = ssm->priv;
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
switch (ssm->cur_state) {
|
||||
case ACTIVATE_GET_SENSOR_DIM:
|
||||
elan_run_cmds(ssm, get_sensor_dim_cmds, get_sensor_dim_cmds_len,
|
||||
ELAN_CMD_TIMEOUT);
|
||||
break;
|
||||
case ACTIVATE_SET_SENSOR_DIM:
|
||||
elandev->frame_width = elandev->last_read[2];
|
||||
elandev->raw_frame_width = elandev->last_read[0];
|
||||
elandev->frame_height =
|
||||
elandev->raw_frame_width - 2 * ELAN_FRAME_MARGIN;
|
||||
fpi_ssm_next_state(ssm);
|
||||
break;
|
||||
case ACTIVATE_START:
|
||||
elan_run_cmds(ssm, init_start_cmds, init_start_cmds_len,
|
||||
ELAN_CMD_TIMEOUT);
|
||||
break;
|
||||
case ACTIVATE_READ_DATA:
|
||||
elan_run_cmds(ssm, read_cmds, read_cmds_len, ELAN_CMD_TIMEOUT);
|
||||
break;
|
||||
case ACTIVATE_END:
|
||||
elan_run_cmds(ssm, init_end_cmds, init_end_cmds_len,
|
||||
ELAN_CMD_TIMEOUT);
|
||||
}
|
||||
}
|
||||
|
||||
static void activate_complete(struct fpi_ssm *ssm)
|
||||
{
|
||||
struct fp_img_dev *dev = ssm->priv;
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
if (elandev->deactivating)
|
||||
elan_deactivate(dev);
|
||||
else if (ssm->error)
|
||||
fpi_imgdev_session_error(dev, ssm->error);
|
||||
else
|
||||
elan_calibrate(dev);
|
||||
fpi_ssm_free(ssm);
|
||||
}
|
||||
|
||||
static int dev_activate(struct fp_img_dev *dev, enum fp_imgdev_state state)
|
||||
{
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
elan_dev_reset(elandev);
|
||||
struct fpi_ssm *ssm =
|
||||
fpi_ssm_new(dev->dev, elan_activate_run_state, ACTIVATE_NUM_STATES);
|
||||
ssm->priv = dev;
|
||||
fpi_ssm_start(ssm, activate_complete);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int dev_init(struct fp_img_dev *dev, unsigned long driver_data)
|
||||
{
|
||||
struct elan_dev *elandev;
|
||||
int r;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
r = libusb_claim_interface(dev->udev, 0);
|
||||
if (r < 0) {
|
||||
fp_err("could not claim interface 0: %s", libusb_error_name(r));
|
||||
return r;
|
||||
}
|
||||
|
||||
dev->priv = elandev = g_malloc0(sizeof(struct elan_dev));
|
||||
fpi_imgdev_open_complete(dev, 0);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void dev_deinit(struct fp_img_dev *dev)
|
||||
{
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
elan_dev_reset(elandev);
|
||||
g_free(elandev);
|
||||
libusb_release_interface(dev->udev, 0);
|
||||
fpi_imgdev_close_complete(dev);
|
||||
}
|
||||
|
||||
static void dev_deactivate(struct fp_img_dev *dev)
|
||||
{
|
||||
struct elan_dev *elandev = dev->priv;
|
||||
|
||||
fp_dbg("");
|
||||
|
||||
elandev->deactivating = TRUE;
|
||||
|
||||
if (elandev->cur_transfer)
|
||||
libusb_cancel_transfer(elandev->cur_transfer);
|
||||
else
|
||||
elan_deactivate(dev);
|
||||
}
|
||||
|
||||
static const struct usb_id id_table[] = {
|
||||
{.vendor = 0x04f3,.product = 0x0907},
|
||||
{0, 0, 0,},
|
||||
};
|
||||
|
||||
struct fp_img_driver elan_driver = {
|
||||
.driver = {
|
||||
.id = ELAN_ID,
|
||||
.name = FP_COMPONENT,
|
||||
.full_name = "ElanTech Fingerprint Sensor",
|
||||
.id_table = id_table,
|
||||
.scan_type = FP_SCAN_TYPE_SWIPE,
|
||||
},
|
||||
.flags = 0,
|
||||
|
||||
.bz3_threshold = 22,
|
||||
|
||||
.open = dev_init,
|
||||
.close = dev_deinit,
|
||||
.activate = dev_activate,
|
||||
.deactivate = dev_deactivate,
|
||||
};
|
||||
Reference in New Issue
Block a user