X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/45e0326f3c336070c59b7e501a2c720dd0a203aa..11e6f8b120d9b38c5f788cb9a04aed24d2e11ce4:/src/am7xxx.c diff --git a/src/am7xxx.c b/src/am7xxx.c index 272a249..1035e23 100644 --- a/src/am7xxx.c +++ b/src/am7xxx.c @@ -19,14 +19,37 @@ #include #include #include +#include #include #include +#include #include "am7xxx.h" #include "serialize.h" #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +/* If we're not using GNU C, elide __attribute__ + * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html) + */ +#ifndef __GNUC__ +# define __attribute__(x) /*NOTHING*/ +#endif + +static void log_message(am7xxx_context *ctx, + int level, + const char *function, + int line, + const char *fmt, + ...) __attribute__ ((format (printf, 5, 6))); + +#define fatal(...) log_message(NULL, AM7XXX_LOG_FATAL, __func__, __LINE__, __VA_ARGS__) +#define error(ctx, ...) log_message(ctx, AM7XXX_LOG_ERROR, __func__, __LINE__, __VA_ARGS__) +#define warning(ctx, ...) log_message(ctx, AM7XXX_LOG_WARNING, __func__, 0, __VA_ARGS__) +#define info(ctx, ...) log_message(ctx, AM7XXX_LOG_INFO, __func__, 0, __VA_ARGS__) +#define debug(ctx, ...) log_message(ctx, AM7XXX_LOG_DEBUG, __func__, 0, __VA_ARGS__) +#define trace(ctx, ...) log_message(ctx, AM7XXX_LOG_TRACE, NULL, 0, __VA_ARGS__) + struct am7xxx_usb_device_descriptor { const char *name; uint16_t vendor_id; @@ -47,7 +70,7 @@ static struct am7xxx_usb_device_descriptor supported_devices[] = { }; /* The header size on the wire is known to be always 24 bytes, regardless of - * the memory configuration enforced by different architechtures or compilers + * the memory configuration enforced by different architectures or compilers * for struct am7xxx_header */ #define AM7XXX_HEADER_WIRE_SIZE 24 @@ -55,6 +78,14 @@ static struct am7xxx_usb_device_descriptor supported_devices[] = { struct _am7xxx_device { libusb_device_handle *usb_device; uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE]; + am7xxx_context *ctx; + am7xxx_device *next; +}; + +struct _am7xxx_context { + libusb_context *usb_context; + int log_level; + am7xxx_device *devices_list; }; typedef enum { @@ -116,71 +147,72 @@ struct am7xxx_header { }; -static void dump_devinfo_header(struct am7xxx_devinfo_header *d) +#ifdef DEBUG +static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d) { - if (d == NULL) + if (ctx == NULL || d == NULL) return; - printf("Info header:\n"); - printf("\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width); - printf("\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height); - printf("\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0); - printf("\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1); + debug(ctx, "Info header:\n"); + debug(ctx, "\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width); + debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height); + debug(ctx, "\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0); + debug(ctx, "\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1); } -static void dump_image_header(struct am7xxx_image_header *i) +static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i) { - if (i == NULL) + if (ctx == NULL || i == NULL) return; - printf("Image header:\n"); - printf("\tformat: 0x%08x (%u)\n", i->format, i->format); - printf("\twidth: 0x%08x (%u)\n", i->width, i->width); - printf("\theight: 0x%08x (%u)\n", i->height, i->height); - printf("\timage size: 0x%08x (%u)\n", i->image_size, i->image_size); + debug(ctx, "Image header:\n"); + debug(ctx, "\tformat: 0x%08x (%u)\n", i->format, i->format); + debug(ctx, "\twidth: 0x%08x (%u)\n", i->width, i->width); + debug(ctx, "\theight: 0x%08x (%u)\n", i->height, i->height); + debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size); } -static void dump_power_header(struct am7xxx_power_header *p) +static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p) { - if (p == NULL) + if (ctx == NULL || p == NULL) return; - printf("Power header:\n"); - printf("\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2); - printf("\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1); - printf("\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0); + debug(ctx, "Power header:\n"); + debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2); + debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1); + debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0); } -static void dump_header(struct am7xxx_header *h) +static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h) { - if (h == NULL) + if (ctx == NULL || h == NULL) return; - printf("packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type); - printf("unknown0: 0x%02hhx (%hhu)\n", h->unknown0, h->unknown0); - printf("header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len); - printf("unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2); - printf("unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3); + debug(ctx, "BEGIN\n"); + debug(ctx, "packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type); + debug(ctx, "unknown0: 0x%02hhx (%hhu)\n", h->unknown0, h->unknown0); + debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len); + debug(ctx, "unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2); + debug(ctx, "unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3); switch(h->packet_type) { case AM7XXX_PACKET_TYPE_DEVINFO: - dump_devinfo_header(&(h->header_data.devinfo)); + debug_dump_devinfo_header(ctx, &(h->header_data.devinfo)); break; case AM7XXX_PACKET_TYPE_IMAGE: - dump_image_header(&(h->header_data.image)); + debug_dump_image_header(ctx, &(h->header_data.image)); break; case AM7XXX_PACKET_TYPE_POWER: - dump_power_header(&(h->header_data.power)); + debug_dump_power_header(ctx, &(h->header_data.power)); break; default: - printf("Packet type not supported!\n"); + debug(ctx, "Packet type not supported!\n"); break; } - - fflush(stdout); + debug(ctx, "END\n\n"); } static inline unsigned int in_80chars(unsigned int i) @@ -190,18 +222,39 @@ static inline unsigned int in_80chars(unsigned int i) return ((i+1) % (80/3)); } -static void dump_buffer(uint8_t *buffer, unsigned int len) +static void trace_dump_buffer(am7xxx_context *ctx, const char *message, + uint8_t *buffer, unsigned int len) { unsigned int i; - if (buffer == NULL || len == 0) + if (ctx == NULL || buffer == NULL || len == 0) return; + trace(ctx, "\n"); + if (message) + trace(ctx, "%s\n", message); + for (i = 0; i < len; i++) { - printf("%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n'); + trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n'); } - fflush(stdout); + trace(ctx, "\n"); +} +#else +static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h) +{ + (void)ctx; + (void)h; +} + +static void trace_dump_buffer(am7xxx_context *ctx, const char *message, + uint8_t *buffer, unsigned int len) +{ + (void)ctx; + (void)message; + (void)buffer; + (void)len; } +#endif /* DEBUG */ static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) { @@ -210,16 +263,12 @@ static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0); if (ret != 0 || (unsigned int)transferred != len) { - fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n", - ret, transferred, len); + error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n", + ret, transferred, len); return ret; } -#if DEBUG - printf("\n<-- received\n"); - dump_buffer(buffer, len); - printf("\n"); -#endif + trace_dump_buffer(dev->ctx, "<-- received", buffer, len); return 0; } @@ -229,16 +278,12 @@ static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) int ret; int transferred = 0; -#if DEBUG - printf("\nsending -->\n"); - dump_buffer(buffer, len); - printf("\n"); -#endif + trace_dump_buffer(dev->ctx, "sending -->", buffer, len); ret = libusb_bulk_transfer(dev->usb_device, 1, buffer, len, &transferred, 0); if (ret != 0 || (unsigned int)transferred != len) { - fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n", - ret, transferred, len); + error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n", + ret, transferred, len); return ret; } @@ -285,11 +330,7 @@ static int read_header(am7xxx_device *dev, struct am7xxx_header *h) unserialize_header(dev->buffer, h); -#if DEBUG - printf("\n"); - dump_header(h); - printf("\n"); -#endif + debug_dump_header(dev->ctx, h); ret = 0; @@ -301,76 +342,319 @@ static int send_header(am7xxx_device *dev, struct am7xxx_header *h) { int ret; -#if DEBUG - printf("\n"); - dump_header(h); - printf("\n"); -#endif + debug_dump_header(dev->ctx, h); serialize_header(h, dev->buffer); ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE); if (ret < 0) - fprintf(stderr, "send_header: failed to send data.\n"); + error(dev->ctx, "failed to send data\n"); return ret; } -am7xxx_device *am7xxx_init(void) +/* When level == AM7XXX_LOG_FATAL do not check the log_level from the context + * and print the message unconditionally, this makes it possible to print + * fatal messages even early on initialization, before the context has been + * set up */ +static void log_message(am7xxx_context *ctx, + int level, + const char *function, + int line, + const char *fmt, + ...) { - unsigned int i; + va_list ap; + + if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) { + if (function) { + fprintf(stderr, "%s", function); + if (line) + fprintf(stderr, "[%d]", line); + fprintf(stderr, ": "); + } - am7xxx_device *dev = malloc(sizeof(*dev)); - if (dev == NULL) { - perror("malloc"); + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + } + + return; +} + +static am7xxx_device *add_new_device(am7xxx_context *ctx) +{ + am7xxx_device **devices_list; + am7xxx_device *new_device; + + if (ctx == NULL) { + fatal("context must not be NULL!\n"); + return NULL; + } + + devices_list = &(ctx->devices_list); + + new_device = malloc(sizeof(*new_device)); + if (new_device == NULL) { + fatal("cannot allocate a new device (%s)\n", strerror(errno)); + return NULL; + } + memset(new_device, 0, sizeof(*new_device)); + + new_device->ctx = ctx; + + if (*devices_list == NULL) { + *devices_list = new_device; + } else { + am7xxx_device *prev = *devices_list; + while (prev->next) + prev = prev->next; + prev->next = new_device; + } + return new_device; +} + +static am7xxx_device *find_device(am7xxx_context *ctx, + unsigned int device_index) +{ + unsigned int i = 0; + am7xxx_device *current; + + if (ctx == NULL) { + fatal("context must not be NULL!\n"); + return NULL; + } + + current = ctx->devices_list; + while (current && i++ < device_index) + current = current->next; + + return current; +} + +typedef enum { + SCAN_OP_BUILD_DEVLIST, + SCAN_OP_OPEN_DEVICE, +} scan_op; + +/** + * This is where the central logic of multi-device support is. + * + * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and + * 'dev' are ignored; the function returns 0 on success and a negative value + * on error. + * + * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB + * device with index 'open_device_index' and returns the correspondent + * am7xxx_device in the 'dev' parameter; the function returns 0 on success, + * 1 if the device was already open and a negative value on error. + * + * NOTES: + * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST, + * the caller might want to call am7xxx_shutdown() in order to remove + * devices possibly added before the failure. + */ +static int scan_devices(am7xxx_context *ctx, scan_op op, + unsigned int open_device_index, am7xxx_device **dev) +{ + int num_devices; + libusb_device** list; + unsigned int current_index; + int i; + int ret; + + if (ctx == NULL) { + fatal("context must not be NULL!\n"); + return -EINVAL; + } + if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) { + error(ctx, "device scan done already? Abort!\n"); + return -EINVAL; + } + + num_devices = libusb_get_device_list(ctx->usb_context, &list); + if (num_devices < 0) { + ret = -ENODEV; goto out; } - memset(dev, 0, sizeof(*dev)); - - libusb_init(NULL); - libusb_set_debug(NULL, 3); - - for (i = 0; i < ARRAY_SIZE(supported_devices); i++) { - dev->usb_device = libusb_open_device_with_vid_pid(NULL, - supported_devices[i].vendor_id, - supported_devices[i].product_id); - if (dev->usb_device) { - printf("%s: device found: %s\n", __func__, supported_devices[i].name); - break; + + current_index = 0; + for (i = 0; i < num_devices; i++) { + struct libusb_device_descriptor desc; + unsigned int j; + + ret = libusb_get_device_descriptor(list[i], &desc); + if (ret < 0) + continue; + + for (j = 0; j < ARRAY_SIZE(supported_devices); j++) { + if (desc.idVendor == supported_devices[j].vendor_id + && desc.idProduct == supported_devices[j].product_id) { + + if (op == SCAN_OP_BUILD_DEVLIST) { + am7xxx_device *new_device; + info(ctx, "am7xxx device found, index: %d, name: %s\n", + current_index, + supported_devices[j].name); + new_device = add_new_device(ctx); + if (new_device == NULL) { + /* XXX, the caller may want + * to call am7xxx_shutdown() if + * we fail here, as we may have + * added some devices already + */ + debug(ctx, "Cannot create a new device\n"); + ret = -ENODEV; + goto out; + } + } else if (op == SCAN_OP_OPEN_DEVICE && + current_index == open_device_index) { + + *dev = find_device(ctx, open_device_index); + if (*dev == NULL) { + ret = -ENODEV; + goto out; + } + + /* the usb device has already been opened */ + if ((*dev)->usb_device) { + debug(ctx, "(*dev)->usb_device already set\n"); + ret = 1; + goto out; + } + + ret = libusb_open(list[i], &((*dev)->usb_device)); + if (ret < 0) { + debug(ctx, "libusb_open failed\n"); + goto out; + } + + libusb_set_configuration((*dev)->usb_device, 1); + libusb_claim_interface((*dev)->usb_device, 0); + goto out; + } + current_index++; + } } } - if (dev->usb_device == NULL) { - errno = ENODEV; - perror("libusb_open_device_with_vid_pid"); - goto out_libusb_exit; + + /* if we made it up to here we didn't find any device to open */ + if (op == SCAN_OP_OPEN_DEVICE) { + error(ctx, "Cannot find any device to open\n"); + ret = -ENODEV; + goto out; + } + + /* everything went fine when building the device list */ + ret = 0; +out: + libusb_free_device_list(list, 1); + return ret; +} + +int am7xxx_init(am7xxx_context **ctx) +{ + int ret = 0; + + *ctx = malloc(sizeof(**ctx)); + if (*ctx == NULL) { + fatal("cannot allocate the context (%s)\n", strerror(errno)); + ret = -ENOMEM; + goto out; } + memset(*ctx, 0, sizeof(**ctx)); + + /* Set the highest log level during initialization */ + (*ctx)->log_level = AM7XXX_LOG_TRACE; + + ret = libusb_init(&((*ctx)->usb_context)); + if (ret < 0) + goto out_free_context; - libusb_set_configuration(dev->usb_device, 1); - libusb_claim_interface(dev->usb_device, 0); + libusb_set_debug((*ctx)->usb_context, 3); - return dev; + ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL); + if (ret < 0) { + error(*ctx, "scan_devices() failed\n"); + am7xxx_shutdown(*ctx); + goto out; + } + + /* Set a quieter log level as default for normal operation */ + (*ctx)->log_level = AM7XXX_LOG_ERROR; + return 0; -out_libusb_exit: - libusb_exit(NULL); - free(dev); +out_free_context: + free(*ctx); + *ctx = NULL; out: - return NULL; + return ret; +} + +void am7xxx_shutdown(am7xxx_context *ctx) +{ + am7xxx_device *current; + + if (ctx == NULL) { + fatal("context must not be NULL!\n"); + return; + } + + current = ctx->devices_list; + while (current) { + am7xxx_device *next = current->next; + am7xxx_close_device(current); + free(current); + current = next; + } + + libusb_exit(ctx->usb_context); + free(ctx); + ctx = NULL; +} + +void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level) +{ + ctx->log_level = log_level; +} + +int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev, + unsigned int device_index) +{ + int ret; + + if (ctx == NULL) { + fatal("context must not be NULL!\n"); + return -EINVAL; + } + + ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev); + if (ret < 0) { + errno = ENODEV; + } else if (ret > 0) { + warning(ctx, "device %d already open\n", device_index); + errno = EBUSY; + ret = -EBUSY; + } + + return ret; } -void am7xxx_shutdown(am7xxx_device *dev) +int am7xxx_close_device(am7xxx_device *dev) { - if (dev) { + if (dev == NULL) { + fatal("dev must not be NULL!\n"); + return -EINVAL; + } + if (dev->usb_device) { + libusb_release_interface(dev->usb_device, 0); libusb_close(dev->usb_device); - libusb_exit(NULL); - free(dev); - dev = NULL; + dev->usb_device = NULL; } + return 0; } int am7xxx_get_device_info(am7xxx_device *dev, - unsigned int *native_width, - unsigned int *native_height, - unsigned int *unknown0, - unsigned int *unknown1) + am7xxx_device_info *device_info) { int ret; struct am7xxx_header h = { @@ -397,10 +681,75 @@ int am7xxx_get_device_info(am7xxx_device *dev, if (ret < 0) return ret; - *native_width = h.header_data.devinfo.native_width; - *native_height = h.header_data.devinfo.native_height; - *unknown0 = h.header_data.devinfo.unknown0; - *unknown1 = h.header_data.devinfo.unknown1; + device_info->native_width = h.header_data.devinfo.native_width; + device_info->native_height = h.header_data.devinfo.native_height; +#if 0 + /* No reason to expose these in the public API until we know what they mean */ + device_info->unknown0 = h.header_data.devinfo.unknown0; + device_info->unknown1 = h.header_data.devinfo.unknown1; +#endif + + return 0; +} + +int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev, + unsigned int upscale, + unsigned int original_width, + unsigned int original_height, + unsigned int *scaled_width, + unsigned int *scaled_height) +{ + + am7xxx_device_info device_info; + float width_ratio; + float height_ratio; + int ret; + + ret = am7xxx_get_device_info(dev, &device_info); + if (ret < 0) { + error(dev->ctx, "cannot get device info\n"); + return ret; + } + + /* + * Check if we need to rescale; if the input image fits the native + * dimensions there is no need to, unless we want to upscale. + */ + if (!upscale && + original_width <= device_info.native_width && + original_height <= device_info.native_height ) { + debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n"); + *scaled_width = original_width; + *scaled_height = original_height; + return 0; + } + + /* Input dimensions relative to the device native dimensions */ + width_ratio = (float)original_width / device_info.native_width; + height_ratio = (float)original_height / device_info.native_height; + + if (width_ratio > height_ratio) { + /* + * The input is proportionally "wider" than the device viewport + * so its height needs to be adjusted + */ + debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n"); + *scaled_width = device_info.native_width; + *scaled_height = (unsigned int)lroundf(original_height / width_ratio); + } else if (width_ratio < height_ratio) { + /* + * The input is proportionally "taller" than the device viewport + * so its width needs to be adjusted + */ + debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n"); + *scaled_width = (unsigned int)lroundf(original_width / height_ratio); + *scaled_height = device_info.native_height; + } else { + debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n"); + *scaled_width = device_info.native_width; + *scaled_height = device_info.native_height; + } + debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height); return 0; } @@ -410,7 +759,7 @@ int am7xxx_send_image(am7xxx_device *dev, unsigned int width, unsigned int height, uint8_t *image, - unsigned int size) + unsigned int image_size) { int ret; struct am7xxx_header h = { @@ -424,7 +773,7 @@ int am7xxx_send_image(am7xxx_device *dev, .format = format, .width = width, .height = height, - .image_size = size, + .image_size = image_size, }, }, }; @@ -433,10 +782,12 @@ int am7xxx_send_image(am7xxx_device *dev, if (ret < 0) return ret; - if (image == NULL || size == 0) + if (image == NULL || image_size == 0) { + warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n"); return 0; + } - return send_data(dev, image, size); + return send_data(dev, image, image_size); } int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode) @@ -481,7 +832,7 @@ int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode) break; default: - fprintf(stderr, "Unsupported power mode.\n"); + error(dev->ctx, "Power mode not supported!\n"); return -EINVAL; };