#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)
{
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);
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");
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);
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");
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
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));
+
+ 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) {
+ 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;
}
- serialize_header(h, buffer);
- ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
+ /* 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;
+
+ 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;
+ }
- free(buffer);
+ 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;
-out_libusb_exit:
- libusb_exit(NULL);
- return NULL;
+ 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;
+ }
+
+ 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,
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,
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 = {
projects / libam7xxx.git / blobdiff