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am7xxx: switch from device quirks to device ops
[libam7xxx.git] / src / am7xxx.c
diff --git a/src/am7xxx.c b/src/am7xxx.c
index 24b2b50..405d141 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -64,32 +64,74 @@ static void log_message(am7xxx_context *ctx,
 #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__)
 
 #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_ops {
+       int (*set_power_mode)(am7xxx_device *dev, am7xxx_power_mode power);
+       int (*set_zoom_mode)(am7xxx_device *dev, am7xxx_zoom_mode zoom);
+};
+
 struct am7xxx_usb_device_descriptor {
        const char *name;
        uint16_t vendor_id;
        uint16_t product_id;
 struct am7xxx_usb_device_descriptor {
        const char *name;
        uint16_t vendor_id;
        uint16_t product_id;
+       uint8_t configuration;    /* The bConfigurationValue of the device */
+       uint8_t interface_number; /* The bInterfaceNumber of the device */
+       struct am7xxx_ops ops;
 };
 
 };
 
-static struct am7xxx_usb_device_descriptor supported_devices[] = {
+static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
+static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
+
+#define DEFAULT_OPS { \
+       .set_power_mode = default_set_power_mode, \
+       .set_zoom_mode = default_set_zoom_mode, \
+}
+
+static const struct am7xxx_usb_device_descriptor supported_devices[] = {
        {
                .name       = "Acer C110",
                .vendor_id  = 0x1de1,
                .product_id = 0xc101,
        {
                .name       = "Acer C110",
                .vendor_id  = 0x1de1,
                .product_id = 0xc101,
+               .configuration    = 2,
+               .interface_number = 0,
+               .ops = DEFAULT_OPS,
        },
        {
                .name       = "Acer C112",
                .vendor_id  = 0x1de1,
                .product_id = 0x5501,
        },
        {
                .name       = "Acer C112",
                .vendor_id  = 0x1de1,
                .product_id = 0x5501,
+               .configuration    = 2,
+               .interface_number = 0,
+               .ops = DEFAULT_OPS,
        },
        {
                .name       ="Aiptek PocketCinema T25",
                .vendor_id  = 0x08ca,
                .product_id = 0x2144,
        },
        {
                .name       ="Aiptek PocketCinema T25",
                .vendor_id  = 0x08ca,
                .product_id = 0x2144,
+               .configuration    = 2,
+               .interface_number = 0,
+               .ops = DEFAULT_OPS,
        },
        {
                .name       = "Philips/Sagemcom PicoPix 1020",
                .vendor_id  = 0x21e7,
                .product_id = 0x000e,
        },
        {
                .name       = "Philips/Sagemcom PicoPix 1020",
                .vendor_id  = 0x21e7,
                .product_id = 0x000e,
+               .configuration    = 2,
+               .interface_number = 0,
+               .ops = DEFAULT_OPS,
+       },
+       {
+               .name       = "Philips/Sagemcom PicoPix 2055",
+               .vendor_id  = 0x21e7,
+               .product_id = 0x0016,
+               .configuration    = 2,
+               .interface_number = 0,
+       },
+       {
+               .name       = "Philips/Sagemcom PicoPix 2330",
+               .vendor_id  = 0x21e7,
+               .product_id = 0x0019,
+               .configuration    = 1,
+               .interface_number = 0,
        },
 };
 
        },
 };
 
@@ -101,8 +143,12 @@ static struct am7xxx_usb_device_descriptor supported_devices[] = {
 
 struct _am7xxx_device {
        libusb_device_handle *usb_device;
 
 struct _am7xxx_device {
        libusb_device_handle *usb_device;
+       struct libusb_transfer *transfer;
+       int transfer_completed;
        uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
        uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
+       am7xxx_device_info *device_info;
        am7xxx_context *ctx;
        am7xxx_context *ctx;
+       const struct am7xxx_usb_device_descriptor *desc;
        am7xxx_device *next;
 };
 
        am7xxx_device *next;
 };
 
@@ -116,7 +162,7 @@ typedef enum {
        AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
        AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
        AM7XXX_PACKET_TYPE_POWER   = 0x04,
        AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
        AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
        AM7XXX_PACKET_TYPE_POWER   = 0x04,
-       AM7XXX_PACKET_TYPE_UNKNOWN = 0x05,
+       AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
 } am7xxx_packet_type;
 
 struct am7xxx_generic_header {
 } am7xxx_packet_type;
 
 struct am7xxx_generic_header {
@@ -146,6 +192,11 @@ struct am7xxx_power_header {
        uint32_t bit0;
 };
 
        uint32_t bit0;
 };
 
+struct am7xxx_zoom_header {
+       uint32_t bit1;
+       uint32_t bit0;
+};
+
 /*
  * Examples of packet headers:
  *
 /*
  * Examples of packet headers:
  *
@@ -171,6 +222,7 @@ struct am7xxx_header {
                struct am7xxx_devinfo_header devinfo;
                struct am7xxx_image_header image;
                struct am7xxx_power_header power;
                struct am7xxx_devinfo_header devinfo;
                struct am7xxx_image_header image;
                struct am7xxx_power_header power;
+               struct am7xxx_zoom_header zoom;
        } header_data;
 };
 
        } header_data;
 };
 
@@ -211,6 +263,16 @@ static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_hea
        debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 }
 
        debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 }
 
+static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
+{
+       if (ctx == NULL || z == NULL)
+               return;
+
+       debug(ctx, "Zoom header:\n");
+       debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
+       debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
+}
+
 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 {
        if (ctx == NULL || h == NULL)
 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 {
        if (ctx == NULL || h == NULL)
@@ -218,7 +280,10 @@ static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 
        debug(ctx, "BEGIN\n");
        debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 
        debug(ctx, "BEGIN\n");
        debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
-       debug(ctx, "direction:       0x%02hhx (%hhu)\n", h->direction, h->direction);
+       debug(ctx, "direction:       0x%02hhx (%hhu) (%s)\n", h->direction, h->direction,
+             h->direction == AM7XXX_DIRECTION_IN ? "IN" :
+             h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
+             "UNKNOWN");
        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);
        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);
@@ -236,6 +301,10 @@ static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
                debug_dump_power_header(ctx, &(h->header_data.power));
                break;
 
                debug_dump_power_header(ctx, &(h->header_data.power));
                break;
 
+       case AM7XXX_PACKET_TYPE_ZOOM:
+               debug_dump_zoom_header(ctx, &(h->header_data.zoom));
+               break;
+
        default:
                debug(ctx, "Packet type not supported!\n");
                break;
        default:
                debug(ctx, "Packet type not supported!\n");
                break;
@@ -318,6 +387,117 @@ static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
        return 0;
 }
 
        return 0;
 }
 
+static void send_data_async_complete_cb(struct libusb_transfer *transfer)
+{
+       am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
+       int *completed = &(dev->transfer_completed);
+       int transferred = transfer->actual_length;
+       int ret;
+
+       if (transferred != transfer->length) {
+               error(dev->ctx, "transferred: %d (expected %u)\n",
+                     transferred, transfer->length);
+       }
+
+       switch (transfer->status) {
+       case LIBUSB_TRANSFER_COMPLETED:
+               ret = 0;
+               break;
+       case LIBUSB_TRANSFER_TIMED_OUT:
+               ret = LIBUSB_ERROR_TIMEOUT;
+               break;
+       case LIBUSB_TRANSFER_STALL:
+               ret = LIBUSB_ERROR_PIPE;
+               break;
+       case LIBUSB_TRANSFER_OVERFLOW:
+               ret = LIBUSB_ERROR_OVERFLOW;
+               break;
+       case LIBUSB_TRANSFER_NO_DEVICE:
+               ret = LIBUSB_ERROR_NO_DEVICE;
+               break;
+       case LIBUSB_TRANSFER_ERROR:
+       case LIBUSB_TRANSFER_CANCELLED:
+               ret = LIBUSB_ERROR_IO;
+               break;
+       default:
+               error(dev->ctx, "unrecognised status code %d", transfer->status);
+               ret = LIBUSB_ERROR_OTHER;
+       }
+
+       if (ret < 0)
+               error(dev->ctx, "libusb transfer failed: %s",
+                     libusb_error_name(ret));
+
+       libusb_free_transfer(transfer);
+       transfer = NULL;
+
+       *completed = 1;
+}
+
+static inline void wait_for_trasfer_completed(am7xxx_device *dev)
+{
+       while (!dev->transfer_completed) {
+               int ret = libusb_handle_events_completed(dev->ctx->usb_context,
+                                                        &(dev->transfer_completed));
+               if (ret < 0) {
+                       if (ret == LIBUSB_ERROR_INTERRUPTED)
+                               continue;
+                       error(dev->ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
+                             libusb_error_name(ret));
+                       libusb_cancel_transfer(dev->transfer);
+                       continue;
+               }
+       }
+}
+
+static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
+{
+       int ret;
+       uint8_t *transfer_buffer;
+
+       dev->transfer = libusb_alloc_transfer(0);
+       if (dev->transfer == NULL) {
+               error(dev->ctx, "cannot allocate transfer (%s)\n",
+                     strerror(errno));
+               return -ENOMEM;
+       }
+
+       /* 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. */
+       transfer_buffer = malloc(len);
+       if (transfer_buffer == NULL) {
+               error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
+                     strerror(errno));
+               ret = -ENOMEM;
+               goto err;
+       }
+       memcpy(transfer_buffer, buffer, len);
+
+       dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
+       libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
+                                 transfer_buffer, len,
+                                 send_data_async_complete_cb, dev, 0);
+
+       /* wait for the previous transfer to complete */
+       wait_for_trasfer_completed(dev);
+
+       trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
+
+       dev->transfer_completed = 0;
+       ret = libusb_submit_transfer(dev->transfer);
+       if (ret < 0)
+               goto err;
+
+       return 0;
+
+err:
+       libusb_free_transfer(dev->transfer);
+       dev->transfer = NULL;
+       return ret;
+}
+
 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 {
        uint8_t **buffer_iterator = &buffer;
 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 {
        uint8_t **buffer_iterator = &buffer;
@@ -358,16 +538,17 @@ static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 
        unserialize_header(dev->buffer, h);
 
 
        unserialize_header(dev->buffer, h);
 
-       debug_dump_header(dev->ctx, h);
-
        if (h->direction == AM7XXX_DIRECTION_IN) {
                ret = 0;
        } else {
                error(dev->ctx,
        if (h->direction == AM7XXX_DIRECTION_IN) {
                ret = 0;
        } else {
                error(dev->ctx,
-                     "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
+                     "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
+                     h->direction);
                ret = -EINVAL;
        }
 
                ret = -EINVAL;
        }
 
+       debug_dump_header(dev->ctx, h);
+
 out:
        return ret;
 }
 out:
        return ret;
 }
@@ -378,7 +559,13 @@ static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 
        debug_dump_header(dev->ctx, h);
 
 
        debug_dump_header(dev->ctx, h);
 
+       /* For symmetry with read_header() we should check here for
+        * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
+        * the callers and save some cycles here.
+        */
+
        serialize_header(h, dev->buffer);
        serialize_header(h, dev->buffer);
+
        ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
        if (ret < 0)
                error(dev->ctx, "failed to send data\n");
        ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
        if (ret < 0)
                error(dev->ctx, "failed to send data\n");
@@ -415,7 +602,8 @@ static void log_message(am7xxx_context *ctx,
        return;
 }
 
        return;
 }
 
-static am7xxx_device *add_new_device(am7xxx_context *ctx)
+static am7xxx_device *add_new_device(am7xxx_context *ctx,
+                                    const struct am7xxx_usb_device_descriptor *desc)
 {
        am7xxx_device **devices_list;
        am7xxx_device *new_device;
 {
        am7xxx_device **devices_list;
        am7xxx_device *new_device;
@@ -425,8 +613,6 @@ static am7xxx_device *add_new_device(am7xxx_context *ctx)
                return NULL;
        }
 
                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));
        new_device = malloc(sizeof(*new_device));
        if (new_device == NULL) {
                fatal("cannot allocate a new device (%s)\n", strerror(errno));
@@ -435,6 +621,10 @@ static am7xxx_device *add_new_device(am7xxx_context *ctx)
        memset(new_device, 0, sizeof(*new_device));
 
        new_device->ctx = ctx;
        memset(new_device, 0, sizeof(*new_device));
 
        new_device->ctx = ctx;
+       new_device->desc = desc;
+       new_device->transfer_completed = 1;
+
+       devices_list = &(ctx->devices_list);
 
        if (*devices_list == NULL) {
                *devices_list = new_device;
 
        if (*devices_list == NULL) {
                *devices_list = new_device;
@@ -490,7 +680,7 @@ typedef enum {
 static int scan_devices(am7xxx_context *ctx, scan_op op,
                        unsigned int open_device_index, am7xxx_device **dev)
 {
 static int scan_devices(am7xxx_context *ctx, scan_op op,
                        unsigned int open_device_index, am7xxx_device **dev)
 {
-       int num_devices;
+       ssize_t num_devices;
        libusb_device** list;
        unsigned int current_index;
        int i;
        libusb_device** list;
        unsigned int current_index;
        int i;
@@ -521,15 +711,15 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
                        continue;
 
                for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
                        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 (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);
 
                                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);
+                                       new_device = add_new_device(ctx, &supported_devices[j]);
                                        if (new_device == NULL) {
                                                /* XXX, the caller may want
                                                 * to call am7xxx_shutdown() if
                                        if (new_device == NULL) {
                                                /* XXX, the caller may want
                                                 * to call am7xxx_shutdown() if
@@ -562,8 +752,32 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
                                                goto out;
                                        }
 
                                                goto out;
                                        }
 
-                                       libusb_set_configuration((*dev)->usb_device, 2);
-                                       libusb_claim_interface((*dev)->usb_device, 0);
+                                       /* XXX, the device is now open, if any
+                                        * of the calls below fail we need to
+                                        * close it again before bailing out.
+                                        */
+
+                                       ret = libusb_set_configuration((*dev)->usb_device,
+                                                                      (*dev)->desc->configuration);
+                                       if (ret < 0) {
+                                               debug(ctx, "libusb_set_configuration failed\n");
+                                               debug(ctx, "Cannot set configuration %hhu\n",
+                                                     (*dev)->desc->configuration);
+                                               goto out_libusb_close;
+                                       }
+
+                                       ret = libusb_claim_interface((*dev)->usb_device,
+                                                                    (*dev)->desc->interface_number);
+                                       if (ret < 0) {
+                                               debug(ctx, "libusb_claim_interface failed\n");
+                                               debug(ctx, "Cannot claim interface %hhu\n",
+                                                     (*dev)->desc->interface_number);
+out_libusb_close:
+                                               libusb_close((*dev)->usb_device);
+                                               (*dev)->usb_device = NULL;
+                                               goto out;
+                                       }
+
                                        goto out;
                                }
                                current_index++;
                                        goto out;
                                }
                                current_index++;
@@ -585,11 +799,111 @@ out:
        return ret;
 }
 
        return ret;
 }
 
+/* Device specific operations */
+
+static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
+{
+       int ret;
+       struct am7xxx_header h = {
+               .packet_type     = AM7XXX_PACKET_TYPE_POWER,
+               .direction       = AM7XXX_DIRECTION_OUT,
+               .header_data_len = sizeof(struct am7xxx_power_header),
+               .unknown2        = 0x3e,
+               .unknown3        = 0x10,
+       };
+
+       switch(power) {
+       case AM7XXX_POWER_OFF:
+               h.header_data.power.bit2 = 0;
+               h.header_data.power.bit1 = 0;
+               h.header_data.power.bit0 = 0;
+               break;
+
+       case AM7XXX_POWER_LOW:
+               h.header_data.power.bit2 = 0;
+               h.header_data.power.bit1 = 0;
+               h.header_data.power.bit0 = 1;
+               break;
+
+       case AM7XXX_POWER_MIDDLE:
+               h.header_data.power.bit2 = 0;
+               h.header_data.power.bit1 = 1;
+               h.header_data.power.bit0 = 0;
+               break;
+
+       case AM7XXX_POWER_HIGH:
+               h.header_data.power.bit2 = 0;
+               h.header_data.power.bit1 = 1;
+               h.header_data.power.bit0 = 1;
+               break;
+
+       case AM7XXX_POWER_TURBO:
+               h.header_data.power.bit2 = 1;
+               h.header_data.power.bit1 = 0;
+               h.header_data.power.bit0 = 0;
+               break;
+
+       default:
+               error(dev->ctx, "Unsupported power mode.\n");
+               return -EINVAL;
+       };
+
+       ret = send_header(dev, &h);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
+{
+       int ret;
+       struct am7xxx_header h = {
+               .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
+               .direction       = AM7XXX_DIRECTION_OUT,
+               .header_data_len = sizeof(struct am7xxx_zoom_header),
+               .unknown2        = 0x3e,
+               .unknown3        = 0x10,
+       };
+
+       switch(zoom) {
+       case AM7XXX_ZOOM_ORIGINAL:
+               h.header_data.zoom.bit1 = 0;
+               h.header_data.zoom.bit0 = 0;
+               break;
+
+       case AM7XXX_ZOOM_H:
+               h.header_data.zoom.bit1 = 0;
+               h.header_data.zoom.bit0 = 1;
+               break;
+
+       case AM7XXX_ZOOM_H_V:
+               h.header_data.zoom.bit1 = 1;
+               h.header_data.zoom.bit0 = 0;
+               break;
+
+       case AM7XXX_ZOOM_TEST:
+               h.header_data.zoom.bit1 = 1;
+               h.header_data.zoom.bit0 = 1;
+               break;
+
+       default:
+               error(dev->ctx, "Unsupported zoom mode.\n");
+               return -EINVAL;
+       };
+
+       ret = send_header(dev, &h);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
 /* Public API */
 
 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 {
 /* Public API */
 
 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 {
-       int ret = 0;
+       int ret;
 
        *ctx = malloc(sizeof(**ctx));
        if (*ctx == NULL) {
 
        *ctx = malloc(sizeof(**ctx));
        if (*ctx == NULL) {
@@ -606,7 +920,7 @@ AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
        if (ret < 0)
                goto out_free_context;
 
        if (ret < 0)
                goto out_free_context;
 
-       libusb_set_debug((*ctx)->usb_context, 3);
+       libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
 
        ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
        if (ret < 0) {
 
        ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
        if (ret < 0) {
@@ -639,6 +953,7 @@ AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
        while (current) {
                am7xxx_device *next = current->next;
                am7xxx_close_device(current);
        while (current) {
                am7xxx_device *next = current->next;
                am7xxx_close_device(current);
+               free(current->device_info);
                free(current);
                current = next;
        }
                free(current);
                current = next;
        }
@@ -666,12 +981,28 @@ AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
        ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
        if (ret < 0) {
                errno = ENODEV;
        ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
        if (ret < 0) {
                errno = ENODEV;
+               goto out;
        } else if (ret > 0) {
                warning(ctx, "device %d already open\n", device_index);
                errno = EBUSY;
                ret = -EBUSY;
        } else if (ret > 0) {
                warning(ctx, "device %d already open\n", device_index);
                errno = EBUSY;
                ret = -EBUSY;
+               goto out;
+       }
+
+       /* Philips/Sagemcom PicoPix projectors require that the DEVINFO packet
+        * 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,
+        */
+       if ((*dev)->device_info == NULL) {
+               ret = am7xxx_get_device_info(*dev, NULL);
+               if (ret < 0)
+                       error(ctx, "cannot get device info\n");
        }
 
        }
 
+out:
        return ret;
 }
 
        return ret;
 }
 
@@ -682,7 +1013,8 @@ AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
                return -EINVAL;
        }
        if (dev->usb_device) {
                return -EINVAL;
        }
        if (dev->usb_device) {
-               libusb_release_interface(dev->usb_device, 0);
+               wait_for_trasfer_completed(dev);
+               libusb_release_interface(dev->usb_device, dev->desc->interface_number);
                libusb_close(dev->usb_device);
                dev->usb_device = NULL;
        }
                libusb_close(dev->usb_device);
                dev->usb_device = NULL;
        }
@@ -709,6 +1041,11 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
                },
        };
 
                },
        };
 
+       if (dev->device_info) {
+               memcpy(device_info, dev->device_info, sizeof(*device_info));
+               return 0;
+       }
+
        ret = send_header(dev, &h);
        if (ret < 0)
                return ret;
        ret = send_header(dev, &h);
        if (ret < 0)
                return ret;
@@ -717,12 +1054,27 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
        if (ret < 0)
                return ret;
 
        if (ret < 0)
                return ret;
 
-       device_info->native_width = h.header_data.devinfo.native_width;
-       device_info->native_height = h.header_data.devinfo.native_height;
+       if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
+               error(dev->ctx, "expected packet type: %d, got %d instead!\n",
+                     AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
+               errno = ENOTSUP;
+               return -ENOTSUP;
+       }
+
+       dev->device_info = malloc(sizeof(*dev->device_info));
+       if (dev->device_info == NULL) {
+               error(dev->ctx, "cannot allocate a device info (%s)\n",
+                      strerror(errno));
+               return -ENOMEM;
+       }
+       memset(dev->device_info, 0, sizeof(*dev->device_info));
+
+       dev->device_info->native_width = h.header_data.devinfo.native_width;
+       dev->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 */
 #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;
+       dev->device_info->unknown0 = h.header_data.devinfo.unknown0;
+       dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
 #endif
 
        return 0;
 #endif
 
        return 0;
@@ -826,56 +1178,60 @@ AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
        return send_data(dev, image, image_size);
 }
 
        return send_data(dev, image, image_size);
 }
 
-AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
+AM7XXX_PUBLIC int am7xxx_send_image_async(am7xxx_device *dev,
+                                         am7xxx_image_format format,
+                                         unsigned int width,
+                                         unsigned int height,
+                                         uint8_t *image,
+                                         unsigned int image_size)
 {
        int ret;
        struct am7xxx_header h = {
 {
        int ret;
        struct am7xxx_header h = {
-               .packet_type     = AM7XXX_PACKET_TYPE_POWER,
+               .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
                .direction       = AM7XXX_DIRECTION_OUT,
                .direction       = AM7XXX_DIRECTION_OUT,
-               .header_data_len = sizeof(struct am7xxx_power_header),
+               .header_data_len = sizeof(struct am7xxx_image_header),
                .unknown2        = 0x3e,
                .unknown3        = 0x10,
                .unknown2        = 0x3e,
                .unknown3        = 0x10,
+               .header_data = {
+                       .image = {
+                               .format     = format,
+                               .width      = width,
+                               .height     = height,
+                               .image_size = image_size,
+                       },
+               },
        };
 
        };
 
-       switch(mode) {
-       case AM7XXX_POWER_OFF:
-               h.header_data.power.bit2 = 0;
-               h.header_data.power.bit1 = 0;
-               h.header_data.power.bit0 = 0;
-               break;
-
-       case AM7XXX_POWER_LOW:
-               h.header_data.power.bit2 = 0;
-               h.header_data.power.bit1 = 0;
-               h.header_data.power.bit0 = 1;
-               break;
+       ret = send_header(dev, &h);
+       if (ret < 0)
+               return ret;
 
 
-       case AM7XXX_POWER_MIDDLE:
-               h.header_data.power.bit2 = 0;
-               h.header_data.power.bit1 = 1;
-               h.header_data.power.bit0 = 0;
-               break;
+       if (image == NULL || image_size == 0) {
+               warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
+               return 0;
+       }
 
 
-       case AM7XXX_POWER_HIGH:
-               h.header_data.power.bit2 = 0;
-               h.header_data.power.bit1 = 1;
-               h.header_data.power.bit0 = 1;
-               break;
+       return send_data_async(dev, image, image_size);
+}
 
 
-       case AM7XXX_POWER_TURBO:
-               h.header_data.power.bit2 = 1;
-               h.header_data.power.bit1 = 0;
-               h.header_data.power.bit0 = 0;
-               break;
+AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
+{
+       if (dev->desc->ops.set_power_mode == NULL) {
+               warning(dev->ctx,
+                       "setting power mode is unsupported on this device\n");
+               return 0;
+       }
 
 
-       default:
-               error(dev->ctx, "Power mode not supported!\n");
-               return -EINVAL;
-       };
+       return dev->desc->ops.set_power_mode(dev, power);
+}
 
 
-       ret = send_header(dev, &h);
-       if (ret < 0)
-               return ret;
+AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
+{
+       if (dev->desc->ops.set_zoom_mode == NULL) {
+               warning(dev->ctx,
+                       "setting zoom mode is unsupported on this device\n");
+               return 0;
+       }
 
 
-       return 0;
+       return dev->desc->ops.set_zoom_mode(dev, zoom);
 }
 }
Open Source library to communicate via USB with Projectors and Digital Picture Frames based on the Actions Micro AM7XXX family of ICs