X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/3c0bc8695b5eb170b423a1d7598bcad5014ed87a..3dcf58dc4693136812e4b3ccba3b0f726c1bf3d2:/src/am7xxx.c diff --git a/src/am7xxx.c b/src/am7xxx.c index c02b539..20b0ddf 100644 --- a/src/am7xxx.c +++ b/src/am7xxx.c @@ -18,13 +18,51 @@ #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]; + am7xxx_context *ctx; + am7xxx_device *next; +}; + +struct _am7xxx_context { + libusb_context *usb_context; + am7xxx_device *devices_list; +}; typedef enum { AM7XXX_PACKET_TYPE_DEVINFO = 0x01, @@ -70,12 +108,6 @@ struct am7xxx_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 */ -/* 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_header { uint32_t packet_type; uint8_t unknown0; @@ -178,12 +210,12 @@ 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 = 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); @@ -199,7 +231,7 @@ 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 = 0; @@ -210,7 +242,7 @@ 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); @@ -250,22 +282,15 @@ 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"); @@ -276,13 +301,11 @@ 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 @@ -291,56 +314,274 @@ 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, dev->buffer); + ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE); + if (ret < 0) + fprintf(stderr, "send_header: failed to send data.\n"); + + return ret; +} + +static am7xxx_device *add_new_device(am7xxx_context *ctx) +{ + am7xxx_device **devices_list; + am7xxx_device *new_device; + + if (ctx == NULL) { + fprintf(stderr, "%s: context must not be NULL!\n", __func__); + return NULL; + } + + devices_list = &(ctx->devices_list); + + new_device = malloc(sizeof(*new_device)); + if (new_device == NULL) { + perror("malloc"); + 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; - serialize_header(h, buffer); - ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE); + if (ctx == NULL) { + fprintf(stderr, "%s: context must not be NULL!\n", __func__); + 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) { + fprintf(stderr, "%s: context must not be NULL!\n", __func__); + return -EINVAL; + } + if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) { + fprintf(stderr, "%s: device scan done already? Abort!\n", __func__); + return -EINVAL; + } + + num_devices = libusb_get_device_list(ctx->usb_context, &list); + if (num_devices < 0) { + ret = -ENODEV; + goto out; + } + + 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; + /* debug */ + printf("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 + */ + 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) { + ret = 1; + goto out; + } + + ret = libusb_open(list[i], &((*dev)->usb_device)); + if (ret < 0) + goto out; + + libusb_set_configuration((*dev)->usb_device, 1); + libusb_claim_interface((*dev)->usb_device, 0); + goto out; + } + current_index++; + } + } + } + + /* if we made it up to here we didn't find any device to open */ + if (op == SCAN_OP_OPEN_DEVICE) { + 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) { + perror("malloc"); + ret = -ENOMEM; + goto out; + } + memset(*ctx, 0, sizeof(**ctx)); + + ret = libusb_init(&((*ctx)->usb_context)); if (ret < 0) - fprintf(stderr, "send_header: failed to send data.\n"); + goto out_free_context; - free(buffer); + libusb_set_debug((*ctx)->usb_context, 3); + + ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL); + if (ret < 0) { + fprintf(stderr, "%s: scan_devices failed\n", __func__); + am7xxx_shutdown(*ctx); + goto out; + } + + return 0; + +out_free_context: + free(*ctx); + *ctx = NULL; +out: return ret; } -am7xxx_device am7xxx_init(void) +void am7xxx_shutdown(am7xxx_context *ctx) { - am7xxx_device dev; + am7xxx_device *current; - libusb_init(NULL); - libusb_set_debug(NULL, 3); + if (ctx == NULL) { + fprintf(stderr, "%s: context must not be NULL!\n", __func__); + return; + } - dev = libusb_open_device_with_vid_pid(NULL, - AM7XXX_VENDOR_ID, - AM7XXX_PRODUCT_ID); - if (dev == NULL) { - errno = ENODEV; - perror("libusb_open_device_with_vid_pid"); - goto out_libusb_exit; + current = ctx->devices_list; + while (current) { + am7xxx_device *next = current->next; + am7xxx_close_device(current); + free(current); + current = next; } - libusb_set_configuration(dev, 1); - libusb_claim_interface(dev, 0); + libusb_exit(ctx->usb_context); + free(ctx); + ctx = NULL; +} - return dev; +int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev, + unsigned int device_index) +{ + int ret; + + if (ctx == NULL) { + fprintf(stderr, "%s: context must not be NULL!\n", __func__); + return -EINVAL; + } + + ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev); + if (ret < 0) { + errno = ENODEV; + } else if (ret > 0) { + /* warning */ + fprintf(stderr, "%s: device %d already open\n", __func__, device_index); + errno = EBUSY; + ret = -EBUSY; + } -out_libusb_exit: - libusb_exit(NULL); - return NULL; + return ret; } -void am7xxx_shutdown(am7xxx_device dev) +int am7xxx_close_device(am7xxx_device *dev) { - if (dev) { - libusb_close(dev); - libusb_exit(NULL); + if (dev == NULL) { + fprintf(stderr, "%s: dev must not be NULL!\n", __func__); + return -EINVAL; + } + if (dev->usb_device) { + libusb_release_interface(dev->usb_device, 0); + libusb_close(dev->usb_device); + dev->usb_device = NULL; } + return 0; } -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, @@ -379,7 +620,7 @@ 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, @@ -413,7 +654,7 @@ 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 = {