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elan: Stop doing sensor reset, change calibration and frame logic

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Sensor reset code has been removed because it is not needed during normal
operation.

Calibration and frame processing logic has been improved according to
recommendations from Elantech.
This commit is contained in:
Igor Filatov
2018-08-09 14:45:33 +02:00
committed by Bastien Nocera
parent fba3e682ea
commit 65bbdff3fc
2 changed files with 244 additions and 202 deletions
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70
libfprint/drivers/elan.h
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@@ -26,36 +26,42 @@
#define ELAN_VENDOR_ID 0x04f3
/* supported devices */
#define ELAN_0903 1
#define ELAN_0907 (1 << 1)
#define ELAN_0C03 (1 << 2)
#define ELAN_0C16 (1 << 3)
#define ELAN_0C1A (1 << 4)
#define ELAN_0C26 (1 << 5)
/* a default device type */
#define ELAN_ALL_DEVICES 0
#define ELAN_ALL_DEVICES (ELAN_0903|ELAN_0907|ELAN_0C03|ELAN_0C16|ELAN_0C1A|ELAN_0C26)
/* devices with quirks */
#define ELAN_0907 1
/* min FW version that supports calibration */
#define ELAN_MIN_CALIBRATION_FW 0x0138
/* max difference between background image mean and calibration mean
* (the response value of get_calib_mean_cmd)*/
#define ELAN_CALIBRATION_MAX_DELTA 500
/* times to retry reading calibration status during one session
* generally prevents calibration from looping indefinitely */
#define ELAN_CALIBRATION_ATTEMPTS 10
/* min and max frames in a capture */
#define ELAN_MIN_FRAMES 7
#define ELAN_MAX_FRAMES 30
/* crop frames to this height to improve stitching */
#define ELAN_MAX_FRAME_HEIGHT 30
/* number of frames to drop at the end of capture because frames captured
* while the finger is being lifted can be bad */
#define ELAN_SKIP_LAST_FRAMES 1
/* max difference between background image mean and calibration mean
* (the response value of get_calib_mean_cmd)*/
#define ELAN_CALIBRATION_MAX_DELTA 500
/* times to retry calibration */
#define ELAN_CALIBRATION_ATTEMPTS 10
#define ELAN_CMD_LEN 0x2
#define ELAN_EP_CMD_OUT (0x1 | LIBUSB_ENDPOINT_OUT)
#define ELAN_EP_CMD_IN (0x3 | LIBUSB_ENDPOINT_IN)
#define ELAN_EP_IMG_IN (0x2 | LIBUSB_ENDPOINT_IN)
/* used as response length to tell the driver to skip reading response */
#define ELAN_CMD_SKIP_READ 0
/* usual command timeout and timeout for when we need to check if the finger is
* still on the device */
#define ELAN_CMD_TIMEOUT 10000
@@ -99,27 +105,6 @@ static const struct elan_cmd get_image_cmd = {
.devices = ELAN_ALL_DEVICES,
};
static const struct elan_cmd get_calib_mean_cmd = {
.cmd = {0x40, 0x24},
.response_len = 0x2,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_ALL_DEVICES & ~ELAN_0903,
};
static const struct elan_cmd reset_sensor_cmd = {
.cmd = {0x40, 0x11},
.response_len = 0x0,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_ALL_DEVICES,
};
static const struct elan_cmd fuse_load_cmd = {
.cmd = {0x40, 0x14},
.response_len = 0x0,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_ALL_DEVICES,
};
static const struct elan_cmd read_sensor_status_cmd = {
.cmd = {0x40, 0x13},
.response_len = 0x1,
@@ -127,16 +112,23 @@ static const struct elan_cmd read_sensor_status_cmd = {
.devices = ELAN_ALL_DEVICES,
};
static const struct elan_cmd run_calibration_cmd = {
static const struct elan_cmd get_calib_status_cmd = {
.cmd = {0x40, 0x23},
.response_len = 0x1,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_ALL_DEVICES,
};
static const struct elan_cmd get_calib_mean_cmd = {
.cmd = {0x40, 0x24},
.response_len = 0x2,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_ALL_DEVICES,
};
static const struct elan_cmd led_on_cmd = {
.cmd = {0x40, 0x31},
.response_len = 0x0,
.response_len = ELAN_CMD_SKIP_READ,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_0907,
};
@@ -153,7 +145,7 @@ static const struct elan_cmd pre_scan_cmd = {
/* led off, stop waiting for finger */
static const struct elan_cmd stop_cmd = {
.cmd = {0x00, 0x0b},
.response_len = 0x0,
.response_len = ELAN_CMD_SKIP_READ,
.response_in = ELAN_EP_CMD_IN,
.devices = ELAN_ALL_DEVICES,
};