am7xxx: use debug() instead of fatal() in add_new_device()
[libam7xxx.git] / src / am7xxx.c
index 3c7c5b4..dd69fc5 100644 (file)
@@ -1,6 +1,6 @@
 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
  *
 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
  *
- * Copyright (C) 2012  Antonio Ospite <ospite@studenti.unina.it>
+ * Copyright (C) 2012-2014  Antonio Ospite <ao2@ao2.it>
  *
  * 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
  *
  * 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
@@ -26,6 +26,7 @@
 
 #include "am7xxx.h"
 #include "serialize.h"
 
 #include "am7xxx.h"
 #include "serialize.h"
+#include "tools.h"
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
@@ -33,7 +34,7 @@
  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  */
 #ifndef __GNUC__
  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  */
 #ifndef __GNUC__
-#  define  __attribute__(x)  /*NOTHING*/
+#  define  __attribute__(x)  /* NOTHING */
 #endif
 
 /* Control shared library symbols visibility */
 #endif
 
 /* Control shared library symbols visibility */
@@ -52,7 +53,7 @@
 
 static void log_message(am7xxx_context *ctx,
                        int level,
 
 static void log_message(am7xxx_context *ctx,
                        int level,
-                       const char *function,
+                       const char *function_name,
                        int line,
                        const char *fmt,
                        ...) __attribute__ ((format (printf, 5, 6)));
                        int line,
                        const char *fmt,
                        ...) __attribute__ ((format (printf, 5, 6)));
@@ -79,7 +80,9 @@ struct am7xxx_usb_device_descriptor {
 };
 
 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
 };
 
 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
+static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
+static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
 
 #define DEFAULT_OPS { \
        .set_power_mode = default_set_power_mode, \
 
 #define DEFAULT_OPS { \
        .set_power_mode = default_set_power_mode, \
@@ -125,6 +128,10 @@ static const struct am7xxx_usb_device_descriptor supported_devices[] = {
                .product_id = 0x0016,
                .configuration    = 2,
                .interface_number = 0,
                .product_id = 0x0016,
                .configuration    = 2,
                .interface_number = 0,
+               .ops = {
+                       .set_power_mode = picopix_set_power_mode,
+                       .set_zoom_mode = picopix_set_zoom_mode,
+               },
        },
        {
                .name       = "Philips/Sagemcom PicoPix 2330",
        },
        {
                .name       = "Philips/Sagemcom PicoPix 2330",
@@ -163,6 +170,11 @@ typedef enum {
        AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
        AM7XXX_PACKET_TYPE_POWER   = 0x04,
        AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
        AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
        AM7XXX_PACKET_TYPE_POWER   = 0x04,
        AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
+       AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW    = 0x15,
+       AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM = 0x16,
+       AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH   = 0x17,
+       AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI    = 0x18,
+       AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI   = 0x19,
 } am7xxx_packet_type;
 
 struct am7xxx_generic_header {
 } am7xxx_packet_type;
 
 struct am7xxx_generic_header {
@@ -228,6 +240,18 @@ struct am7xxx_header {
 
 
 #ifdef DEBUG
 
 
 #ifdef DEBUG
+static void debug_dump_generic_header(am7xxx_context *ctx, struct am7xxx_generic_header *g)
+{
+       if (ctx == NULL || g == NULL)
+               return;
+
+       debug(ctx, "Generic header:\n");
+       debug(ctx, "\tfield0:  0x%08x (%u)\n", g->field0, g->field0);
+       debug(ctx, "\tfield1:  0x%08x (%u)\n", g->field1, g->field1);
+       debug(ctx, "\tfield2:  0x%08x (%u)\n", g->field2, g->field2);
+       debug(ctx, "\tfield3:  0x%08x (%u)\n", g->field3, g->field3);
+}
+
 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 {
        if (ctx == NULL || d == NULL)
 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 {
        if (ctx == NULL || d == NULL)
@@ -306,7 +330,8 @@ static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
                break;
 
        default:
                break;
 
        default:
-               debug(ctx, "Packet type not supported!\n");
+               debug(ctx, "Parsing data not supported for this packet type!\n");
+               debug_dump_generic_header(ctx, &(h->header_data.data));
                break;
        }
        debug(ctx, "END\n\n");
                break;
        }
        debug(ctx, "END\n\n");
@@ -356,12 +381,13 @@ static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 {
        int ret;
 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 {
        int ret;
-       int transferred = 0;
+       int transferred;
 
 
+       transferred = 0;
        ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
        if (ret != 0 || (unsigned int)transferred != len) {
        ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
        if (ret != 0 || (unsigned int)transferred != len) {
-               error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
-                     ret, transferred, len);
+               error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
+                     libusb_error_name(ret), transferred, len);
                return ret;
        }
 
                return ret;
        }
 
@@ -373,14 +399,15 @@ static int read_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;
 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 {
        int ret;
-       int transferred = 0;
+       int transferred;
 
        trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 
 
        trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 
+       transferred = 0;
        ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
        if (ret != 0 || (unsigned int)transferred != len) {
        ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
        if (ret != 0 || (unsigned int)transferred != len) {
-               error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
-                     ret, transferred, len);
+               error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
+                     libusb_error_name(ret), transferred, len);
                return ret;
        }
 
                return ret;
        }
 
@@ -464,8 +491,8 @@ static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len
 
        /* Make a copy of the buffer so the caller can safely reuse it just
         * after libusb_submit_transfer() has returned. This technique
 
        /* 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. */
+        * requires more dynamic allocations compared to 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",
        transfer_buffer = malloc(len);
        if (transfer_buffer == NULL) {
                error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
@@ -601,7 +628,7 @@ static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
  * set up */
 static void log_message(am7xxx_context *ctx,
                        int level,
  * set up */
 static void log_message(am7xxx_context *ctx,
                        int level,
-                       const char *function,
+                       const char *function_name,
                        int line,
                        const char *fmt,
                        ...)
                        int line,
                        const char *fmt,
                        ...)
@@ -609,8 +636,8 @@ static void log_message(am7xxx_context *ctx,
        va_list ap;
 
        if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
        va_list ap;
 
        if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
-               if (function) {
-                       fprintf(stderr, "%s", function);
+               if (function_name) {
+                       fprintf(stderr, "%s", function_name);
                        if (line)
                                fprintf(stderr, "[%d]", line);
                        fprintf(stderr, ": ");
                        if (line)
                                fprintf(stderr, "[%d]", line);
                        fprintf(stderr, ": ");
@@ -637,7 +664,7 @@ static am7xxx_device *add_new_device(am7xxx_context *ctx,
 
        new_device = malloc(sizeof(*new_device));
        if (new_device == NULL) {
 
        new_device = malloc(sizeof(*new_device));
        if (new_device == NULL) {
-               fatal("cannot allocate a new device (%s)\n", strerror(errno));
+               debug(ctx, "cannot allocate a new device (%s)\n", strerror(errno));
                return NULL;
        }
        memset(new_device, 0, sizeof(*new_device));
                return NULL;
        }
        memset(new_device, 0, sizeof(*new_device));
@@ -677,6 +704,120 @@ static am7xxx_device *find_device(am7xxx_context *ctx,
        return current;
 }
 
        return current;
 }
 
+static int open_device(am7xxx_context *ctx,
+                      unsigned int device_index,
+                      libusb_device *usb_dev,
+                      am7xxx_device **dev)
+{
+       int ret;
+       int current_configuration;
+
+       *dev = find_device(ctx, device_index);
+       if (*dev == NULL) {
+               ret = -ENODEV;
+               goto out;
+       }
+
+       /* the usb device has already been opened */
+       if ((*dev)->usb_device) {
+               debug(ctx, "(*dev)->usb_device already set\n");
+               ret = 1;
+               goto out;
+       }
+
+       ret = libusb_open(usb_dev, &((*dev)->usb_device));
+       if (ret < 0) {
+               debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
+               goto out;
+       }
+
+       /* XXX, the device is now open, if any of the calls below fail we need
+        * to close it again before bailing out.
+        */
+
+       current_configuration = -1;
+       ret = libusb_get_configuration((*dev)->usb_device,
+                                      &current_configuration);
+       if (ret < 0) {
+               debug(ctx, "libusb_get_configuration failed: %s\n",
+                     libusb_error_name(ret));
+               goto out_libusb_close;
+       }
+
+       if (current_configuration != (*dev)->desc->configuration) {
+               /*
+                * In principle, before setting a new configuration, kernel
+                * drivers should be detached from _all_ interfaces; for
+                * example calling something like the following "invented"
+                * function _before_ setting the new configuration:
+                *
+                *   libusb_detach_all_kernel_drivers((*dev)->usb_device);
+                *
+                * However, in practice, this is not necessary for most
+                * devices as they have only one configuration.
+                *
+                * When a device only has one configuration:
+                *
+                *   - if there was a kernel driver bound to the device, it
+                *     had already set the configuration and the call below
+                *     will be skipped;
+                *
+                *   - if no kernel driver was bound to the device, the call
+                *     below will suceed.
+                */
+               ret = libusb_set_configuration((*dev)->usb_device,
+                                              (*dev)->desc->configuration);
+               if (ret < 0) {
+                       debug(ctx, "libusb_set_configuration failed: %s\n",
+                             libusb_error_name(ret));
+                       debug(ctx, "Cannot set configuration %hhu\n",
+                             (*dev)->desc->configuration);
+                       goto out_libusb_close;
+               }
+       }
+
+       libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1);
+
+       ret = libusb_claim_interface((*dev)->usb_device,
+                                    (*dev)->desc->interface_number);
+       if (ret < 0) {
+               debug(ctx, "libusb_claim_interface failed: %s\n",
+                     libusb_error_name(ret));
+               debug(ctx, "Cannot claim interface %hhu\n",
+                     (*dev)->desc->interface_number);
+               goto out_libusb_close;
+       }
+
+       /* Checking that the configuration has not changed, as suggested in
+        * http://libusb.sourceforge.net/api-1.0/caveats.html
+        */
+       current_configuration = -1;
+       ret = libusb_get_configuration((*dev)->usb_device,
+                                      &current_configuration);
+       if (ret < 0) {
+               debug(ctx, "libusb_get_configuration after claim failed: %s\n",
+                     libusb_error_name(ret));
+               goto out_libusb_release_interface;
+       }
+
+       if (current_configuration != (*dev)->desc->configuration) {
+               debug(ctx, "libusb configuration changed (expected: %hhu, current: %hhu\n",
+                     (*dev)->desc->configuration, current_configuration);
+               ret = -EINVAL;
+               goto out_libusb_release_interface;
+       }
+out:
+       return ret;
+
+out_libusb_release_interface:
+       libusb_release_interface((*dev)->usb_device,
+                                (*dev)->desc->interface_number);
+out_libusb_close:
+       libusb_close((*dev)->usb_device);
+       (*dev)->usb_device = NULL;
+       return ret;
+}
+
 typedef enum {
        SCAN_OP_BUILD_DEVLIST,
        SCAN_OP_OPEN_DEVICE,
 typedef enum {
        SCAN_OP_BUILD_DEVLIST,
        SCAN_OP_OPEN_DEVICE,
@@ -686,13 +827,14 @@ typedef enum {
  * This is where the central logic of multi-device support is.
  *
  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
  * 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
+ * 'dev' are ignored; the function returns 0 on success or 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
  * 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.
+ * am7xxx_device in the 'dev' parameter; the function returns the value from
+ * open_device(), which is 0 on success, 1 if the device was already open or
+ * a negative value on error.
  *
  * NOTES:
  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
  *
  * NOTES:
  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
@@ -703,7 +845,7 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
                        unsigned int open_device_index, am7xxx_device **dev)
 {
        ssize_t num_devices;
                        unsigned int open_device_index, am7xxx_device **dev)
 {
        ssize_t num_devices;
-       libusb_device** list;
+       libusb_device **list;
        unsigned int current_index;
        int i;
        int ret;
        unsigned int current_index;
        int i;
        int ret;
@@ -755,51 +897,16 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
                                } else if (op == SCAN_OP_OPEN_DEVICE &&
                                           current_index == open_device_index) {
 
                                } 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) {
-                                               debug(ctx, "(*dev)->usb_device already set\n");
-                                               ret = 1;
-                                               goto out;
-                                       }
-
-                                       ret = libusb_open(list[i], &((*dev)->usb_device));
-                                       if (ret < 0) {
-                                               debug(ctx, "libusb_open failed\n");
-                                               goto out;
-                                       }
-
-                                       /* 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;
-                                       }
+                                       ret = open_device(ctx,
+                                                         open_device_index,
+                                                         list[i],
+                                                         dev);
+                                       if (ret < 0)
+                                               debug(ctx, "open_device failed\n");
 
 
+                                       /* exit the loop unconditionally after
+                                        * attempting to open the device
+                                        * requested by the user */
                                        goto out;
                                }
                                current_index++;
                                        goto out;
                                }
                                current_index++;
@@ -807,7 +914,8 @@ out_libusb_close:
                }
        }
 
                }
        }
 
-       /* if we made it up to here we didn't find any device to open */
+       /* if we made it up to here when op == SCAN_OP_OPEN_DEVICE,
+        * no devices to open had been found. */
        if (op == SCAN_OP_OPEN_DEVICE) {
                error(ctx, "Cannot find any device to open\n");
                ret = -ENODEV;
        if (op == SCAN_OP_OPEN_DEVICE) {
                error(ctx, "Cannot find any device to open\n");
                ret = -ENODEV;
@@ -877,6 +985,26 @@ static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
        return 0;
 }
 
        return 0;
 }
 
+static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
+{
+       switch(power) {
+       case AM7XXX_POWER_LOW:
+               return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW);
+
+       case AM7XXX_POWER_MIDDLE:
+               return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM);
+
+       case AM7XXX_POWER_HIGH:
+               return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH);
+
+       case AM7XXX_POWER_OFF:
+       case AM7XXX_POWER_TURBO:
+       default:
+               error(dev->ctx, "Unsupported power mode.\n");
+               return -EINVAL;
+       };
+}
+
 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
 {
        int ret;
 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
 {
        int ret;
@@ -909,6 +1037,7 @@ static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
                h.header_data.zoom.bit0 = 1;
                break;
 
                h.header_data.zoom.bit0 = 1;
                break;
 
+       case AM7XXX_ZOOM_TELE:
        default:
                error(dev->ctx, "Unsupported zoom mode.\n");
                return -EINVAL;
        default:
                error(dev->ctx, "Unsupported zoom mode.\n");
                return -EINVAL;
@@ -921,6 +1050,41 @@ static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
        return 0;
 }
 
        return 0;
 }
 
+static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
+{
+       int ret;
+       am7xxx_packet_type packet_type;
+
+       switch(zoom) {
+       case AM7XXX_ZOOM_ORIGINAL:
+               packet_type = AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI;
+               break;
+
+       case AM7XXX_ZOOM_TELE:
+               packet_type = AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI;
+               break;
+
+       case AM7XXX_ZOOM_H:
+       case AM7XXX_ZOOM_H_V:
+       case AM7XXX_ZOOM_TEST:
+       default:
+               error(dev->ctx, "Unsupported zoom mode.\n");
+               return -EINVAL;
+       };
+
+       ret = send_command(dev, packet_type);
+       if (ret < 0)
+               return ret;
+
+       /* The Windows drivers wait for 100ms and send the same command again,
+        * probably to overcome a firmware deficiency */
+       ret = msleep(100);
+       if (ret < 0)
+               return ret;
+
+       return send_command(dev, packet_type);
+}
+
 /* Public API */
 
 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 /* Public API */
 
 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
@@ -939,8 +1103,10 @@ AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
        (*ctx)->log_level = AM7XXX_LOG_TRACE;
 
        ret = libusb_init(&((*ctx)->usb_context));
        (*ctx)->log_level = AM7XXX_LOG_TRACE;
 
        ret = libusb_init(&((*ctx)->usb_context));
-       if (ret < 0)
+       if (ret < 0) {
+               error(*ctx, "libusb_init failed: %s\n", libusb_error_name(ret));
                goto out_free_context;
                goto out_free_context;
+       }
 
        libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
 
 
        libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
 
@@ -1047,7 +1213,7 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
                           am7xxx_device_info *device_info)
 {
        int ret;
                           am7xxx_device_info *device_info)
 {
        int ret;
-       struct am7xxx_header h = { 0 };
+       struct am7xxx_header h;
 
        if (dev->device_info) {
                memcpy(device_info, dev->device_info, sizeof(*device_info));
 
        if (dev->device_info) {
                memcpy(device_info, dev->device_info, sizeof(*device_info));
@@ -1058,6 +1224,7 @@ AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
        if (ret < 0)
                return ret;
 
        if (ret < 0)
                return ret;
 
+       memset(&h, 0, sizeof(h));
        ret = read_header(dev, &h);
        if (ret < 0)
                return ret;
        ret = read_header(dev, &h);
        if (ret < 0)
                return ret;