* taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
*/
#ifndef __GNUC__
-# define __attribute__(x) /*NOTHING*/
+# define __attribute__(x) /* NOTHING */
#endif
/* Control shared library symbols visibility */
static void log_message(am7xxx_context *ctx,
int level,
- const char *function,
+ const char *function_name,
int line,
const char *fmt,
...) __attribute__ ((format (printf, 5, 6)));
{
/* The 3 below is the length of "xx " where xx is the hex string
* representation of a byte */
- return ((i+1) % (80/3));
+ return ((i + 1) % (80 / 3));
}
static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
{
int ret;
- int transferred = 0;
+ int transferred;
+ transferred = 0;
ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
if (ret != 0 || (unsigned int)transferred != len) {
error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
{
int ret;
- int transferred = 0;
+ int transferred;
trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
+ transferred = 0;
ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
if (ret != 0 || (unsigned int)transferred != len) {
error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
/* Make a copy of the buffer so the caller can safely reuse it just
* after libusb_submit_transfer() has returned. This technique
- * requires more allocations than a proper double-buffering approach
- * but it takes a lot less code. */
+ * requires more dynamic allocations compared to a proper
+ * double-buffering approach but it takes a lot less code. */
transfer_buffer = malloc(len);
if (transfer_buffer == NULL) {
error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
* set up */
static void log_message(am7xxx_context *ctx,
int level,
- const char *function,
+ const char *function_name,
int line,
const char *fmt,
...)
va_list ap;
if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
- if (function) {
- fprintf(stderr, "%s", function);
+ if (function_name) {
+ fprintf(stderr, "%s", function_name);
if (line)
fprintf(stderr, "[%d]", line);
fprintf(stderr, ": ");
new_device = malloc(sizeof(*new_device));
if (new_device == NULL) {
- fatal("cannot allocate a new device (%s)\n", strerror(errno));
+ debug(ctx, "cannot allocate a new device (%s)\n", strerror(errno));
return NULL;
}
memset(new_device, 0, sizeof(*new_device));
static int open_device(am7xxx_context *ctx,
unsigned int device_index,
- libusb_device* usb_dev,
+ libusb_device *usb_dev,
am7xxx_device **dev)
{
int ret;
/* the usb device has already been opened */
if ((*dev)->usb_device) {
- debug(ctx, "(*dev)->usb_device already set\n");
ret = 1;
goto out;
}
*/
current_configuration = -1;
- libusb_get_configuration((*dev)->usb_device, ¤t_configuration);
+ ret = libusb_get_configuration((*dev)->usb_device,
+ ¤t_configuration);
+ if (ret < 0) {
+ debug(ctx, "libusb_get_configuration failed: %s\n",
+ libusb_error_name(ret));
+ goto out_libusb_close;
+ }
+
if (current_configuration != (*dev)->desc->configuration) {
+ /*
+ * In principle, before setting a new configuration, kernel
+ * drivers should be detached from _all_ interfaces; for
+ * example calling something like the following "invented"
+ * function _before_ setting the new configuration:
+ *
+ * libusb_detach_all_kernel_drivers((*dev)->usb_device);
+ *
+ * However, in practice, this is not necessary for most
+ * devices as they have only one configuration.
+ *
+ * When a device only has one configuration:
+ *
+ * - if there was a kernel driver bound to the device, it
+ * had already set the configuration and the call below
+ * will be skipped;
+ *
+ * - if no kernel driver was bound to the device, the call
+ * below will suceed.
+ */
ret = libusb_set_configuration((*dev)->usb_device,
(*dev)->desc->configuration);
if (ret < 0) {
* http://libusb.sourceforge.net/api-1.0/caveats.html
*/
current_configuration = -1;
- libusb_get_configuration((*dev)->usb_device, ¤t_configuration);
+ ret = libusb_get_configuration((*dev)->usb_device,
+ ¤t_configuration);
+ if (ret < 0) {
+ debug(ctx, "libusb_get_configuration after claim failed: %s\n",
+ libusb_error_name(ret));
+ goto out_libusb_release_interface;
+ }
+
if (current_configuration != (*dev)->desc->configuration) {
- debug(ctx, "libusb configuration changed\n");
- debug(ctx, "Cannot claim interface %hhu\n",
- (*dev)->desc->interface_number);
- goto out_libusb_close;
+ debug(ctx, "libusb configuration changed (expected: %hhu, current: %d)\n",
+ (*dev)->desc->configuration, current_configuration);
+ ret = -EINVAL;
+ goto out_libusb_release_interface;
}
out:
return ret;
+out_libusb_release_interface:
+ libusb_release_interface((*dev)->usb_device,
+ (*dev)->desc->interface_number);
out_libusb_close:
libusb_close((*dev)->usb_device);
(*dev)->usb_device = NULL;
unsigned int open_device_index, am7xxx_device **dev)
{
ssize_t num_devices;
- libusb_device** list;
+ libusb_device **list;
unsigned int current_index;
int i;
int ret;
(*ctx)->log_level = AM7XXX_LOG_TRACE;
ret = libusb_init(&((*ctx)->usb_context));
- if (ret < 0)
+ if (ret < 0) {
+ error(*ctx, "libusb_init failed: %s\n", libusb_error_name(ret));
goto out_free_context;
+ }
libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
unsigned int *scaled_width,
unsigned int *scaled_height)
{
-
am7xxx_device_info device_info;
float width_ratio;
float height_ratio;
projects / libam7xxx.git / blobdiff