====== Canon Powershot S2 IS ======

{{http://images-eu.amazon.com/images/P/B0009JQQDW.03.LZZZZZZZ.jpg?200 }} The PowerShot S2 is not a //mass storage// device so you can't just mount it to get the pictures. Instead it uses the //Picture Transfer Protocol// (PTP). A userspace tool which speaks this protocol is [[http://www.gphoto.org|gphoto2]]. The PowerShot S2 is supported since version 2.1.6.

===== gphoto2 Setup on Debian =====

==== with hotplug ====

The 2.1.6 release is only available in the unstable branch:

  #> apt-get -t unstable install gphoto2

or under Gentoo (the rest of the directions here work just fine under gentoo (thanks to original poster)).

  {~} $ emerge gphoto2

To make it work for non-root users do the following to let hotplug set up the correct permissions for you:

  #> /usr/lib/libgphoto2/print-usb-usermap |sed -e 's/^usbcam/libgphoto2/' > /etc/hotplug/usb/libgphoto2.usermap

The above step makes sure all cams supported by libgphoto2 are known to the hotplug daemon. Debian uses a different script than the default install thus the [[man>sed]]. The rest needed should be set up by the debian package already. If not refer to the [[http://www.gphoto.org/doc/manual/permissions-usb.html|gphoto2 manual]]. The only thing left is to add the users which are allowed to access the cam to the group ''camera''.

Connecting the camera should print the following in the syslog:

  Jul 30 16:47:09 rumpel kernel: usb 1-4: new high speed USB device using address 12
  Jul 30 16:47:09 rumpel usb.agent[23381]:      libgphoto2: loaded successfully

Try your luck with the autodetection and you should see this:

  $> gphoto2 --auto-detect
  Model                          Port                                            
  ----------------------------------------------------------
  Canon PowerShot S2 IS (PTP mode) usb:            
  Canon PowerShot S2 IS (PTP mode) usb:001,012


==== with udev 084 ====

The hotplug method mentioned above doesn't work anymore with a recent kernel and a matching udev version (udev replaces hotplug). I had to use the following rule placed in ''/etc/udev/rules.d/10-local.rules'':

<code>
BUS="usb", SYSFS{idVendor}="04a9", SYSFS{idProduct}="30f0", GROUP="camera", MODE="0660", \
  PROGRAM="/bin/sh -c 'K=%k; K=$${K#usbdev}; printf bus/usb/%%03i/%%03i $${K%%%%.*} $${K#*.}'", \
  NAME="%c", RUN="/bin/sh -c 'chgrp camera /proc/%c && chmod 0660 /proc/%c'"
</code>

The rest is the same, add your user to the ''camera'' group and use ''gphoto2 --auto-detect --list-files'' to test.

===== Getting images from the Camera =====

You could of course use some GUI like the gtkam utility but I prefer a little script to do what I want. It fetches all available images to the current directory, autorotates them lossless using [[man>exiftran]] and deletes all images from the camera. 

<code bash>
#!/bin/sh

#The cameras image folder. use '--list-files' to get the name of the image folder
FOLDER='/store_00010001/'

echo "fetching all files..."
gphoto2 --auto-detect --get-all-files --folder $FOLDER

echo "Autorotating images..."
exiftran -ai *.JPG 

echo
echo "Deleting images from camera (Abort now if not wanted)"
echo -n "Hit enter to continue "
read foo

gphoto2 --auto-detect --delete-all-files --recurse --folder $FOLDER
</code>

===== lsusb -v Output =====

<code>
Bus 001 Device 007: ID 04a9:30f0 Canon, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x04a9 Canon, Inc.
  idProduct          0x30f0 
  bcdDevice            0.02
  iManufacturer           1 Canon Inc.
  iProduct                2 Canon Digital Camera
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           39
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self Powered
    MaxPower                2mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           3
      bInterfaceClass         6 Imaging
      bInterfaceSubClass      1 Still Image Capture
      bInterfaceProtocol      1 Picture Transfer Protocol (PIMA 15470)
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval              10
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
</code>