How do I know what gphoto2 supports on my camera? Well this is fairly simple, you can look on the website I mentioned earlier, or you can use this command:

  gphoto2 --summary

So here is the output for my 700D
Camera summary: Manufacturer: Canon Inc. Model: Canon EOS 700D

Version: 3-1.1.3
Serial Number: 46ff2aa38fba41f88d84eccb8eba8ada

Vendor Extension ID: 0xb (1.0)

Capture Formats: JPEG Display Formats: Association/Directory, Script, DPOF, MS AVI, MS Wave, JPEG, CRW, Unknown(b103), Unknown(bf02), Defined Type, Unknown(b104), Unknown(b105)

Device Capabilities:

      File Download, File Deletion, File Upload
      No Image Capture, No Open Capture, Canon EOS Capture, Canon EOS Shutter Button

Storage Devices Summary: store_00020001:

      StorageDescription: SD
      VolumeLabel: None
      Storage Type: Removable RAM (memory card)
      Filesystemtype: Digital Camera Layout (DCIM)
      Access Capability: Read-Write
      Maximum Capability: 31678529536 (30211 MB)
      Free Space (Bytes): 31375130624 (29921 MB)
      Free Space (Images): -1

Device Property Summary: Property 0xd402:(read only) (type=0xffff) 'Canon EOS 700D' Property 0xd407:(read only) (type=0x6) 1 Property 0xd406:(readwrite) (type=0xffff) 'Unknown Initiator' Property 0xd303:(read only) (type=0x2) 1 Battery Level(0x5001):(read only) (type=0x2) Enumeration [100,0,75,0,50] value: 100% (100)

I don't know how accurate this information is, I haven't studied it that closely yet.