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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
*
* Copyright (C) 2017 Richard Hughes <richard@hughsie.com>
*
* Licensed under the GNU General Public License Version 2
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <string.h>
#include "huey-device.h"
/* device constants */
#define HUEY_DEVICE_TIMEOUT 30000 /* ms */
#define HUEY_EEPROM_SIZE 0x3ff /* bytes */
#define HUEY_CMD_GET_STATUS 0x00
#define HUEY_CMD_REGISTER_READ 0x08
#define HUEY_CMD_SAMPLE_BY_PULSES 0x04
#define HUEY_CMD_SAMPLE_BY_TIME 0x53
#define HUEY_RC_SUCCESS 0x00
#define HUEY_RC_ERROR 0x80
static gboolean
huey_device_send_data (GUsbDevice *device,
const guint8 *request,
gsize request_len,
guint8 *reply,
gsize reply_len,
gsize *reply_read,
GError **error)
{
gboolean ret;
/* control transfer */
cd_buffer_debug (CD_BUFFER_KIND_REQUEST,
request, request_len);
ret = g_usb_device_control_transfer (device,
G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
G_USB_DEVICE_REQUEST_TYPE_CLASS,
G_USB_DEVICE_RECIPIENT_INTERFACE,
0x09,
0x0200,
0,
(guint8 *) request,
request_len,
NULL,
HUEY_DEVICE_TIMEOUT,
NULL,
error);
if (!ret)
return FALSE;
/* get sync response */
ret = g_usb_device_interrupt_transfer (device,
0x81,
(guint8 *) reply,
reply_len,
reply_read,
HUEY_DEVICE_TIMEOUT,
NULL,
error);
if (!ret)
return FALSE;
/* the second byte seems to be the command again */
cd_buffer_debug (CD_BUFFER_KIND_RESPONSE,
reply, *reply_read);
if (reply[1] != request[0]) {
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"wrong command reply, got 0x%02x, "
"expected 0x%02x",
reply[1],
request[0]);
return FALSE;
}
/* the first byte is status */
if (reply[0] != HUEY_RC_SUCCESS) {
g_set_error (error,
G_IO_ERROR,
G_IO_ERROR_FAILED,
"failed to issue command: %s", &reply[2]);
return FALSE;
}
/* success */
return TRUE;
}
gchar *
huey_device_get_status (GUsbDevice *device, GError **error)
{
guint8 request[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
guint8 reply[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
gboolean ret;
gsize reply_read;
g_autoptr(GError) error_local = NULL;
request[0] = HUEY_CMD_GET_STATUS;
ret = huey_device_send_data (device,
request, 8,
reply, 8,
&reply_read,
&error_local);
if (!ret) {
if (!g_error_matches (error_local, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED)) {
g_propagate_error (error, error_local);
error_local = NULL;
return NULL;
}
}
/* for error the string is also set */
return g_strndup ((gchar *) reply + 2, 6);
}
GBytes *
huey_device_read_eeprom (GUsbDevice *device, GError **error)
{
guint8 request[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
guint8 reply[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
gboolean ret;
gsize reply_read;
g_autofree guint8 *eeprom = NULL;
/* get entire memory space */
eeprom = g_malloc0 (HUEY_EEPROM_SIZE);
request[0] = HUEY_CMD_REGISTER_READ;
for (guint i = 0; i < HUEY_EEPROM_SIZE; i += 0x4) {
guint16 addr_be = GUINT16_TO_BE (i);
memcpy (&request[1], &addr_be, 0x2);
ret = huey_device_send_data (device,
request, 8,
reply, 8,
&reply_read,
error);
if (!ret) {
g_prefix_error (error, "failed to read eeprom @0x%04x: ", i);
return NULL;
}
memcpy (eeprom + i, reply + 0x4, 0x4);
}
return g_bytes_new (eeprom, HUEY_EEPROM_SIZE);
}
gboolean
huey_device_open (GUsbDevice *device, GError **error)
{
if (!g_usb_device_open (device, error)) {
g_prefix_error (error, "failed to open device: ");
return FALSE;
}
if (!g_usb_device_set_configuration (device, 0x01, error)) {
g_prefix_error (error, "failed to set config on device: ");
return FALSE;
}
if (!g_usb_device_claim_interface (device, 0x00,
G_USB_DEVICE_CLAIM_INTERFACE_BIND_KERNEL_DRIVER, error)) {
g_prefix_error (error, "failed to claim interface for device: ");
return FALSE;
}
return TRUE;
}
gboolean
huey_device_take_sample (GUsbDevice *device, gdouble *val, GError **error)
{
gboolean ret;
gdouble val_approx;
gdouble val_pulses;
gsize reply_read;
guint16 timeout_be = GUINT16_TO_BE (0x0062);
guint32 val_be;
guint8 request[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
guint8 reply[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };
/* get approx reading so we know the number of pulses to count */
request[0] = HUEY_CMD_SAMPLE_BY_TIME;
memcpy (&request[1], &timeout_be, 0x2);
ret = huey_device_send_data (device,
request, 8,
reply, 8,
&reply_read,
error);
if (!ret)
return FALSE;
memcpy (&val_be, reply + 2, 4);
val_approx = (gdouble) GUINT32_FROM_BE (val_be);
g_debug ("approximate reading=%.0f", val_approx);
/* calculate the number of pulses we should look for */
val_approx *= 2.9f;
timeout_be = GUINT16_TO_BE ((guint16) val_approx);
/* get a precise reading by counting pulses */
request[0] = HUEY_CMD_SAMPLE_BY_PULSES;
memcpy (&request[1], &timeout_be, 0x2);
ret = huey_device_send_data (device,
request, 8,
reply, 8,
&reply_read,
error);
if (!ret)
return FALSE;
memcpy (&val_be, reply + 2, 4);
val_pulses = (gdouble) GUINT32_FROM_BE (val_be);
g_debug ("number of pulses=%.0f", val_pulses);
/* calculate luminance */
if (val != NULL)
*val = (val_approx * 1000.f) / val_pulses;
return TRUE;
}
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