X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/b162f59656e930be8826a0202b994c3cc4835882..14b6a47d284966d034259b433028e25c5adcd9bd:/src/am7xxx.c

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 483eaf7..114027e 100644
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -18,13 +18,121 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <errno.h>
+#include <libusb.h>
 
 #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_device *next;
+};
+
+struct _am7xxx_context {
+	libusb_context *usb_context;
+	am7xxx_device *devices_list;
+};
+
+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)
+{
+	if (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);
+}
 
 static void dump_image_header(struct am7xxx_image_header *i)
 {
@@ -38,6 +146,17 @@ static void dump_image_header(struct am7xxx_image_header *i)
 	printf("\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 }
 
+static void dump_power_header(struct am7xxx_power_header *p)
+{
+	if (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);
+}
+
 static void dump_header(struct am7xxx_header *h)
 {
 	if (h == NULL)
@@ -50,10 +169,18 @@ static void dump_header(struct am7xxx_header *h)
 	printf("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));
+		break;
+
 	case AM7XXX_PACKET_TYPE_IMAGE:
 		dump_image_header(&(h->header_data.image));
 		break;
 
+	case AM7XXX_PACKET_TYPE_POWER:
+		dump_power_header(&(h->header_data.power));
+		break;
+
 	default:
 		printf("Packet type not supported!\n");
 		break;
@@ -82,17 +209,39 @@ static void dump_buffer(uint8_t *buffer, unsigned int len)
 	fflush(stdout);
 }
 
-static int send_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->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);
+		return ret;
+	}
+
+#if DEBUG
+	printf("\n<-- received\n");
+	dump_buffer(buffer, len);
+	printf("\n");
+#endif
+
+	return 0;
+}
+
+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");
 	dump_buffer(buffer, 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);
@@ -117,66 +266,342 @@ static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 	put_le32(h->header_data.data.field3, buffer_iterator);
 }
 
-static int send_header(am7xxx_device dev, struct am7xxx_header *h)
+static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
+{
+	uint8_t **buffer_iterator = &buffer;
+
+	h->packet_type = get_le32(buffer_iterator);
+	h->unknown0 = get_8(buffer_iterator);
+	h->header_data_len = get_8(buffer_iterator);
+	h->unknown2 = get_8(buffer_iterator);
+	h->unknown3 = get_8(buffer_iterator);
+	h->header_data.data.field0 = get_le32(buffer_iterator);
+	h->header_data.data.field1 = get_le32(buffer_iterator);
+	h->header_data.data.field2 = get_le32(buffer_iterator);
+	h->header_data.data.field3 = get_le32(buffer_iterator);
+}
+
+static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 {
-	uint8_t *buffer;
 	int ret;
 
+	ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
+	if (ret < 0)
+		goto out;
+
+	unserialize_header(dev->buffer, h);
+
 #if DEBUG
+	printf("\n");
 	dump_header(h);
 	printf("\n");
 #endif
 
-	buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
-	if (buffer == NULL) {
-		perror("calloc buffer");
-		return -ENOMEM;
-	}
+	ret = 0;
+
+out:
+	return ret;
+}
 
-	serialize_header(h, buffer);
-	ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
+static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
+{
+	int ret;
+
+#if DEBUG
+	printf("\n");
+	dump_header(h);
+	printf("\n");
+#endif
+
+	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)
+static am7xxx_device *add_new_device(am7xxx_device **devices_list)
 {
-	am7xxx_device dev;
+	am7xxx_device *new_device;
 
-	libusb_init(NULL);
-	libusb_set_debug(NULL, 3);
+	new_device = malloc(sizeof(*new_device));
+	if (new_device == NULL) {
+		perror("malloc");
+		return NULL;
+	}
+	memset(new_device, 0, sizeof(*new_device));
+
+	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;
+}
 
-	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;
+static am7xxx_device *find_device(am7xxx_device *devices_list,
+				  unsigned int device_index)
+{
+	unsigned int i = 0;
+	am7xxx_device *current = 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->devices_list));
+					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->devices_list, 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;
+	}
+
+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)
+		goto out_free_context;
+
+	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;
+}
+
+void am7xxx_shutdown(am7xxx_context *ctx)
+{
+	am7xxx_device *current;
+
+	if (ctx == NULL) {
+		fprintf(stderr, "%s: context must not be NULL!\n", __func__);
+		return;
+	}
+
+	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;
+}
+
+int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
+		       unsigned int device_index)
+{
+	int ret;
 
-	return dev;
+	if (ctx == NULL) {
+		fprintf(stderr, "%s: context must not be NULL!\n", __func__);
+		return -EINVAL;
+	}
 
-out_libusb_exit:
-	libusb_exit(NULL);
-	return NULL;
+	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;
+	}
+
+	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_send_image(am7xxx_device dev,
+int am7xxx_get_device_info(am7xxx_device *dev,
+			   unsigned int *native_width,
+			   unsigned int *native_height,
+			   unsigned int *unknown0,
+			   unsigned int *unknown1)
+{
+	int ret;
+	struct am7xxx_header h = {
+		.packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
+		.unknown0        = 0x00,
+		.header_data_len = 0x00,
+		.unknown2        = 0x3e,
+		.unknown3        = 0x10,
+		.header_data = {
+			.devinfo = {
+				.native_width  = 0,
+				.native_height = 0,
+				.unknown0      = 0,
+				.unknown1      = 0,
+			},
+		},
+	};
+
+	ret = send_header(dev, &h);
+	if (ret < 0)
+		return ret;
+
+	ret = read_header(dev, &h);
+	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;
+
+	return 0;
+}
+
+int am7xxx_send_image(am7xxx_device *dev,
 		      am7xxx_image_format format,
 		      unsigned int width,
 		      unsigned int height,
@@ -209,3 +634,56 @@ 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 ret;
+	struct am7xxx_header h = {
+		.packet_type     = AM7XXX_PACKET_TYPE_POWER,
+		.unknown0        = 0x00,
+		.header_data_len = sizeof(struct am7xxx_power_header),
+		.unknown2        = 0x3e,
+		.unknown3        = 0x10,
+	};
+
+	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;
+
+	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:
+		fprintf(stderr, "Unsupported power mode.\n");
+		return -EINVAL;
+	};
+
+	ret = send_header(dev, &h);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}