am7xxx: implement the set_zoom_mode() operation for the PicoPix 2055

Apparently AM7XXX_ZOOM_ORIGINAL and AM7XXX_ZOOM_TELE are the only
supported zoom modes on the PicoPix 2055.

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 6fbee5c..ffdd59c 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -26,6 +26,7 @@
 
 #include "am7xxx.h"
 #include "serialize.h"
+#include "tools.h"
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 
@@ -81,6 +82,7 @@ struct am7xxx_usb_device_descriptor {
 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 picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
 
 #define DEFAULT_OPS { \
        .set_power_mode = default_set_power_mode, \
@@ -128,6 +130,7 @@ static const struct am7xxx_usb_device_descriptor supported_devices[] = {
                .interface_number = 0,
                .ops = {
                        .set_power_mode = picopix_set_power_mode,
+                       .set_zoom_mode = picopix_set_zoom_mode,
                },
        },
        {
@@ -170,6 +173,8 @@ typedef enum {
        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 {
@@ -962,6 +967,41 @@ static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
        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)