*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
+ * the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
*/
#include <stdio.h>
-#include <endian.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
-
-#if 1
-static uint8_t reference_image_header[] = {
- 0x02, 0x00, 0x00, 0x00,
- 0x00,
- 0x10,
- 0x3e,
- 0x10,
- 0x01, 0x00, 0x00, 0x00,
- 0x20, 0x03, 0x00, 0x00,
- 0xe0, 0x01, 0x00, 0x00,
- 0x53, 0xE8, 0x00, 0x00
+#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;
};
-#endif
+
+
+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)
{
return;
printf("Image header:\n");
- printf("format: 0x%08x (%u)\n", i->format, i->format);
- printf("width: 0x%08x (%u)\n", i->width, i->width);
- printf("height: 0x%08x (%u)\n", i->height, i->height);
- printf("image size: 0x%08x (%u)\n", i->image_size, i->image_size);
+ printf("\tformat: 0x%08x (%u)\n", i->format, i->format);
+ printf("\twidth: 0x%08x (%u)\n", i->width, i->width);
+ printf("\theight: 0x%08x (%u)\n", i->height, i->height);
+ 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)
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;
static inline unsigned int in_80chars(unsigned int i)
{
+ /* The 3 below is the length of "xx " where xx is the hex string
+ * representation of a byte */
return ((i+1) % (80/3));
}
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;
+ 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
- ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0);
+ return 0;
+}
+
+static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
+{
+ int ret;
+ int transferred = 0;
+
+#if DEBUG
+ printf("\nsending -->\n");
+ dump_buffer(buffer, len);
+ printf("\n");
+#endif
+
+ 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);
return 0;
}
-static int send_header(am7xxx_device dev, struct am7xxx_header *h)
+static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
{
- union {
- struct am7xxx_header header;
- uint8_t buffer[sizeof (struct am7xxx_header)];
- } data;
+ uint8_t **buffer_iterator = &buffer;
+
+ put_le32(h->packet_type, buffer_iterator);
+ put_8(h->unknown0, buffer_iterator);
+ put_8(h->header_data_len, buffer_iterator);
+ put_8(h->unknown2, buffer_iterator);
+ put_8(h->unknown3, buffer_iterator);
+ put_le32(h->header_data.data.field0, buffer_iterator);
+ put_le32(h->header_data.data.field1, buffer_iterator);
+ put_le32(h->header_data.data.field2, buffer_iterator);
+ put_le32(h->header_data.data.field3, buffer_iterator);
+}
+
+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)
+{
+ 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
- data.header = *h;
+ ret = 0;
- return send_data(dev, data.buffer, sizeof (struct am7xxx_header));
+out:
+ return ret;
}
-am7xxx_device am7xxx_init(void)
+static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
{
- am7xxx_device dev;
+ int ret;
- libusb_init(NULL);
- libusb_set_debug(NULL, 3);
+#if DEBUG
+ printf("\n");
+ dump_header(h);
+ printf("\n");
+#endif
- 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;
+ 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_device **devices_list)
+{
+ am7xxx_device *new_device;
+
+ 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;
+}
- libusb_set_configuration(dev, 1);
- libusb_claim_interface(dev, 0);
+static am7xxx_device *find_device(am7xxx_device *devices_list,
+ unsigned int device_index)
+{
+ unsigned int i = 0;
+ am7xxx_device *current = devices_list;
- return dev;
+ while (current && i++ < device_index)
+ current = current->next;
-out_libusb_exit:
- libusb_exit(NULL);
- return NULL;
+ return current;
}
-void am7xxx_shutdown(am7xxx_device dev)
+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)
{
- if (dev) {
- libusb_close(dev);
- libusb_exit(NULL);
+ 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;
+ }
+
+ /* 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)
+ 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_exit(ctx->usb_context);
+ free(ctx);
+ ctx = NULL;
+}
+
+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;
+ }
+
+ return ret;
+}
+
+int am7xxx_close_device(am7xxx_device *dev)
+{
+ 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,
+ 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,
+int am7xxx_send_image(am7xxx_device *dev,
am7xxx_image_format format,
unsigned int width,
unsigned int height,
{
int ret;
struct am7xxx_header h = {
- .packet_type = htole32(AM7XXX_PACKET_TYPE_IMAGE),
+ .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
.unknown0 = 0x00,
.header_data_len = sizeof(struct am7xxx_image_header),
.unknown2 = 0x3e,
.unknown3 = 0x10,
.header_data = {
.image = {
- .format = htole32(format),
- .width = htole32(width),
- .height = htole32(height),
- .image_size = htole32(size),
+ .format = format,
+ .width = width,
+ .height = height,
+ .image_size = size,
},
},
};
- dump_header(&h);
- printf("\n");
-
- printf("Dump Buffers\n");
- dump_buffer(reference_image_header, sizeof(struct am7xxx_header));
-
ret = send_header(dev, &h);
if (ret < 0)
return ret;
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;
+}