177 lines
4.5 KiB
C
177 lines
4.5 KiB
C
/*
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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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#ifndef __ELAN_H
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#define __ELAN_H
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#include <string.h>
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#include <libusb.h>
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/* number of pixels to discard on left and right (along raw image height)
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* because they have different intensity from the rest of the frame */
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#define ELAN_FRAME_MARGIN 12
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/* min and max frames in a capture */
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#define ELAN_MIN_FRAMES 7
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#define ELAN_MAX_FRAMES 30
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/* number of frames to drop at the end of capture because frames captured
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* while the finger is being lifted can be bad */
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#define ELAN_SKIP_LAST_FRAMES 1
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#define ELAN_CMD_LEN 0x2
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#define ELAN_EP_CMD_OUT (0x1 | LIBUSB_ENDPOINT_OUT)
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#define ELAN_EP_CMD_IN (0x3 | LIBUSB_ENDPOINT_IN)
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#define ELAN_EP_IMG_IN (0x2 | LIBUSB_ENDPOINT_IN)
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/* usual command timeout and timeout for when we need to check if the finger is
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* still on the device */
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#define ELAN_CMD_TIMEOUT 10000
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#define ELAN_FINGER_TIMEOUT 200
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struct elan_cmd {
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unsigned char cmd[ELAN_CMD_LEN];
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int response_len;
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int response_in;
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};
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static const struct elan_cmd get_sensor_dim_cmds[] = {
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{
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.cmd = {0x00, 0x0c},
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.response_len = 0x4,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static const size_t get_sensor_dim_cmds_len =
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array_n_elements(get_sensor_dim_cmds);
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static const struct elan_cmd init_start_cmds[] = {
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{
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.cmd = {0x40, 0x19},
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.response_len = 0x2,
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.response_in = ELAN_EP_CMD_IN,
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},
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{
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.cmd = {0x40, 0x2a},
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.response_len = 0x2,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static const size_t init_start_cmds_len = array_n_elements(init_start_cmds);
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static const struct elan_cmd read_cmds[] = {
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/* raw frame sizes are calculated from image dimesions reported by the
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* device */
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{
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.cmd = {0x00, 0x09},
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.response_len = -1,
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.response_in = ELAN_EP_IMG_IN,
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},
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};
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const size_t read_cmds_len = array_n_elements(read_cmds);
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/* issued after data reads during init and calibration */
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static const struct elan_cmd init_end_cmds[] = {
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{
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.cmd = {0x40, 0x24},
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.response_len = 0x2,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static const size_t init_end_cmds_len = array_n_elements(init_end_cmds);
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/* same command 2 times
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* original driver may observe return value to determine how many times it
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* should be repeated */
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static const struct elan_cmd calibrate_start_cmds[] = {
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{
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.cmd = {0x40, 0x23},
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.response_len = 0x1,
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.response_in = ELAN_EP_CMD_IN,
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},
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{
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.cmd = {0x40, 0x23},
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.response_len = 0x1,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static const size_t calibrate_start_cmds_len =
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array_n_elements(calibrate_start_cmds);
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/* issued after data reads during init and calibration */
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static const struct elan_cmd calibrate_end_cmds[] = {
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{
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.cmd = {0x40, 0x24},
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.response_len = 0x2,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static const size_t calibrate_end_cmds_len =
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array_n_elements(calibrate_end_cmds);
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static const struct elan_cmd capture_start_cmds[] = {
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/* led on */
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{
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.cmd = {0x40, 0x31},
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.response_len = 0x0,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static size_t capture_start_cmds_len = array_n_elements(capture_start_cmds);
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static const struct elan_cmd capture_wait_finger_cmds[] = {
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/* wait for finger
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* subsequent read will not complete until finger is placed on the reader */
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{
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.cmd = {0x40, 0x3f},
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.response_len = 0x1,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static size_t capture_wait_finger_cmds_len =
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array_n_elements(capture_wait_finger_cmds);
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static const struct elan_cmd deactivate_cmds[] = {
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/* led off */
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{
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.cmd = {0x00, 0x0b},
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.response_len = 0x0,
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.response_in = ELAN_EP_CMD_IN,
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},
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};
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static const size_t deactivate_cmds_len = array_n_elements(deactivate_cmds);
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static void elan_cmd_cb(struct libusb_transfer *transfer);
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static void elan_cmd_read(struct fpi_ssm *ssm);
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static void elan_run_next_cmd(struct fpi_ssm *ssm);
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static void elan_capture(struct fp_img_dev *dev);
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#endif
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