X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/cd64a0277a5ca41122a343b26e4bad98b0377256..952989bf287cbc37b28832c08a3d439ccacb6db6:/src/am7xxx.c?ds=inline diff --git a/src/am7xxx.c b/src/am7xxx.c index f4203e3..84d7e9c 100644 --- a/src/am7xxx.c +++ b/src/am7xxx.c @@ -53,7 +53,7 @@ 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))); @@ -341,7 +341,7 @@ static inline unsigned int in_80chars(unsigned int i) { /* 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, @@ -381,8 +381,9 @@ 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", @@ -398,10 +399,11 @@ static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) 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", @@ -489,8 +491,8 @@ static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len /* 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", @@ -626,7 +628,7 @@ static int send_command(am7xxx_device *dev, am7xxx_packet_type type) * set up */ static void log_message(am7xxx_context *ctx, int level, - const char *function, + const char *function_name, int line, const char *fmt, ...) @@ -634,8 +636,8 @@ static void log_message(am7xxx_context *ctx, 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, ": "); @@ -662,7 +664,7 @@ static am7xxx_device *add_new_device(am7xxx_context *ctx, 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)); @@ -718,7 +720,6 @@ static int open_device(am7xxx_context *ctx, /* the usb device has already been opened */ if ((*dev)->usb_device) { - debug(ctx, "(*dev)->usb_device already set\n"); ret = 1; goto out; } @@ -734,8 +735,35 @@ static int open_device(am7xxx_context *ctx, */ 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) { @@ -763,16 +791,26 @@ static int open_device(am7xxx_context *ctx, * 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; @@ -1055,8 +1093,7 @@ AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx) *ctx = malloc(sizeof(**ctx)); if (*ctx == NULL) { fatal("cannot allocate the context (%s)\n", strerror(errno)); - ret = -ENOMEM; - goto out; + return -ENOMEM; } memset(*ctx, 0, sizeof(**ctx)); @@ -1064,8 +1101,10 @@ AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx) (*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); @@ -1140,14 +1179,14 @@ AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev, * is the first one to be sent to the device in order for it to * successfully return the correct device information. * - * So, if there is not a cached version of it (from a previous open), - * we ask for device info at open time, + * NOTE: am7xxx_get_device_info() will fetch the actual device info + * from the device only the very first time it's called for a given + * device, otherwise, it'll return a cached version of the device info + * (from a previous call to am7xxx_open_device(), for instance). */ - if ((*dev)->device_info == NULL) { - ret = am7xxx_get_device_info(*dev, NULL); - if (ret < 0) - error(ctx, "cannot get device info\n"); - } + ret = am7xxx_get_device_info(*dev, NULL); + if (ret < 0) + error(ctx, "cannot get device info\n"); out: return ret; @@ -1174,10 +1213,9 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev, int ret; struct am7xxx_header h; - if (dev->device_info) { - memcpy(device_info, dev->device_info, sizeof(*device_info)); - return 0; - } + /* if there is a cached copy of the device info, just return that */ + if (dev->device_info) + goto return_value; ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO); if (ret < 0) @@ -1211,6 +1249,9 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev, dev->device_info->unknown1 = h.header_data.devinfo.unknown1; #endif +return_value: + if (device_info) + memcpy(device_info, dev->device_info, sizeof(*device_info)); return 0; } @@ -1221,7 +1262,6 @@ AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev, unsigned int *scaled_width, unsigned int *scaled_height) { - am7xxx_device_info device_info; float width_ratio; float height_ratio;