X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/48aab112af60be0f18c0e6fbf1534415af445a8f..45e0326f3c336070c59b7e501a2c720dd0a203aa:/src/am7xxx.c diff --git a/src/am7xxx.c b/src/am7xxx.c index cdcbf3f..272a249 100644 --- a/src/am7xxx.c +++ b/src/am7xxx.c @@ -18,13 +18,103 @@ #include #include +#include #include +#include #include "am7xxx.h" #include "serialize.h" -#define AM7XXX_VENDOR_ID 0x1de1 -#define AM7XXX_PRODUCT_ID 0xc101 +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) + +struct am7xxx_usb_device_descriptor { + const char *name; + uint16_t vendor_id; + uint16_t product_id; +}; + +static struct am7xxx_usb_device_descriptor supported_devices[] = { + { + .name = "Acer C110", + .vendor_id = 0x1de1, + .product_id = 0xc101, + }, + { + .name = "Philips/Sagemcom PicoPix 1020", + .vendor_id = 0x21e7, + .product_id = 0x000e, + }, +}; + +/* The header size on the wire is known to be always 24 bytes, regardless of + * the memory configuration enforced by different architechtures or compilers + * for struct am7xxx_header + */ +#define AM7XXX_HEADER_WIRE_SIZE 24 + +struct _am7xxx_device { + libusb_device_handle *usb_device; + uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE]; +}; + +typedef enum { + AM7XXX_PACKET_TYPE_DEVINFO = 0x01, + AM7XXX_PACKET_TYPE_IMAGE = 0x02, + AM7XXX_PACKET_TYPE_POWER = 0x04, + AM7XXX_PACKET_TYPE_UNKNOWN = 0x05, +} am7xxx_packet_type; + +struct am7xxx_generic_header { + uint32_t field0; + uint32_t field1; + uint32_t field2; + uint32_t field3; +}; + +struct am7xxx_devinfo_header { + uint32_t native_width; + uint32_t native_height; + uint32_t unknown0; + uint32_t unknown1; +}; + +struct am7xxx_image_header { + uint32_t format; + uint32_t width; + uint32_t height; + uint32_t image_size; +}; + +struct am7xxx_power_header { + uint32_t bit2; + uint32_t bit1; + uint32_t bit0; +}; + +/* + * Examples of packet headers: + * + * Image header: + * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00 + * + * Power header: + * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 + */ + +struct am7xxx_header { + uint32_t packet_type; + uint8_t unknown0; + uint8_t header_data_len; + uint8_t unknown2; + uint8_t unknown3; + union { + struct am7xxx_generic_header data; + struct am7xxx_devinfo_header devinfo; + struct am7xxx_image_header image; + struct am7xxx_power_header power; + } header_data; +}; + static void dump_devinfo_header(struct am7xxx_devinfo_header *d) { @@ -113,12 +203,12 @@ static void dump_buffer(uint8_t *buffer, unsigned int len) fflush(stdout); } -static int read_data(am7xxx_device dev, uint8_t *buffer, unsigned int len) +static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len) { int ret; - int transferred; + int transferred = 0; - ret = libusb_bulk_transfer(dev, 0x81, buffer, len, &transferred, 0); + 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); @@ -134,10 +224,10 @@ static int read_data(am7xxx_device dev, uint8_t *buffer, unsigned int len) return 0; } -static int send_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; + int transferred = 0; #if DEBUG printf("\nsending -->\n"); @@ -145,7 +235,7 @@ static int send_data(am7xxx_device dev, uint8_t *buffer, unsigned int len) printf("\n"); #endif - ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0); + 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); @@ -185,22 +275,15 @@ static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h) h->header_data.data.field3 = get_le32(buffer_iterator); } -static int read_header(am7xxx_device dev, struct am7xxx_header *h) +static int read_header(am7xxx_device *dev, struct am7xxx_header *h) { - uint8_t *buffer; int ret; - buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1); - if (buffer == NULL) { - perror("calloc buffer"); - return -ENOMEM; - } - - ret = read_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE); + ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE); if (ret < 0) goto out; - unserialize_header(buffer, h); + unserialize_header(dev->buffer, h); #if DEBUG printf("\n"); @@ -211,13 +294,11 @@ static int read_header(am7xxx_device dev, struct am7xxx_header *h) ret = 0; out: - free(buffer); return ret; } -static int send_header(am7xxx_device dev, struct am7xxx_header *h) +static int send_header(am7xxx_device *dev, struct am7xxx_header *h) { - uint8_t *buffer; int ret; #if DEBUG @@ -226,56 +307,66 @@ static int send_header(am7xxx_device dev, struct am7xxx_header *h) printf("\n"); #endif - buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1); - if (buffer == NULL) { - perror("calloc buffer"); - return -ENOMEM; - } - - serialize_header(h, buffer); - ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE); + 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"); - free(buffer); return ret; } -am7xxx_device am7xxx_init(void) +am7xxx_device *am7xxx_init(void) { - am7xxx_device dev; + unsigned int i; + + am7xxx_device *dev = malloc(sizeof(*dev)); + if (dev == NULL) { + perror("malloc"); + goto out; + } + memset(dev, 0, sizeof(*dev)); libusb_init(NULL); libusb_set_debug(NULL, 3); - dev = libusb_open_device_with_vid_pid(NULL, - AM7XXX_VENDOR_ID, - AM7XXX_PRODUCT_ID); - if (dev == NULL) { + 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; + } + } + if (dev->usb_device == NULL) { errno = ENODEV; perror("libusb_open_device_with_vid_pid"); goto out_libusb_exit; } - libusb_set_configuration(dev, 1); - libusb_claim_interface(dev, 0); + libusb_set_configuration(dev->usb_device, 1); + libusb_claim_interface(dev->usb_device, 0); return dev; out_libusb_exit: libusb_exit(NULL); + free(dev); +out: return NULL; } -void am7xxx_shutdown(am7xxx_device dev) +void am7xxx_shutdown(am7xxx_device *dev) { if (dev) { - libusb_close(dev); + libusb_close(dev->usb_device); libusb_exit(NULL); + free(dev); + dev = NULL; } } -int am7xxx_get_device_info(am7xxx_device dev, +int am7xxx_get_device_info(am7xxx_device *dev, unsigned int *native_width, unsigned int *native_height, unsigned int *unknown0, @@ -314,7 +405,7 @@ int am7xxx_get_device_info(am7xxx_device dev, return 0; } -int am7xxx_send_image(am7xxx_device dev, +int am7xxx_send_image(am7xxx_device *dev, am7xxx_image_format format, unsigned int width, unsigned int height, @@ -348,7 +439,7 @@ int am7xxx_send_image(am7xxx_device dev, return send_data(dev, image, size); } -int am7xxx_set_power_mode(am7xxx_device dev, am7xxx_power_mode mode) +int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode) { int ret; struct am7xxx_header h = {