1 Microdia USB 2.0 Webcam Driver
2 ==============================
4 This Driver is essentially a fork of the Syntek Webcam drivers for Linux
5 by Nicolas Vivien, specifically to accomodate SN9C20x chipset based Webcams.
7 The driver currently supports the latest version of Video For Linux i.e
8 V4L2. V4L1 is deprecated, and applications like Camorama that use only V4L1 will
11 This driver currently supports Skype v2.x, Ekiga v2.x & even aMSN
14 The Microdia USB 2.0 Webcam Driver for SN9C20x chipset based Webcams is
15 currently under development. Using this driver can result in damage.
16 Use this driver only if you know what you are doing.
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30 4.1 Option "fps" module
31 4.2 Options "hflip" and "vflip" module
32 4.3 Options "contrast", "colour", "whiteness" and "brightness"
37 6. Documentation & References
39 7. Debugging webcam driver problems
40 7.1. "dmesg" & webcam driver status
42 7.3. USB logs from Windows
43 7.4. USB logs from Linux
44 7.5. Enable module traces
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52 Kernel 2.6.18 or higher
53 Doxygen in order to compile the documentation
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61 To build documentation :
67 To build the kernel module :
72 This will create the kernel object file called "microdia.ko"
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77 To build and load the driver, follow the steps :
79 $ make -f Makefile clean
81 $ sudo modprobe videodev
82 $ sudo modprobe compat-ioctl32 //Only required for 64-bit Linux OS
83 $ sudo insmod microdia.ko
85 To test the driver with a V4L v2 compliant application, try :
89 $ mplayer tv:// -tv driver=v4l2:width=640:height=480:fps=25:device=/dev/video0 -vo x11
90 $ mplayer tv:// -tv driver=v4l2:width=640:height=480:fps=25:device=/dev/video0 -vo xv
92 --------------------------------------------------------------------------------
96 4.1 Option "fps" module
98 The microdia module waits the option "fps" (10, 15, 20, 25, 30) :
99 $ modprobe microdia fps=30
101 By default, the fps is set to '25'.
103 4.2 Options "hflip" and "vflip" module
105 The microdia module accepts the following options
106 "hflip" and "vflip" (values are 0 or 1)
107 $ modprobe microdia hflip=0 vflip=1
109 By default, the hflip and vflip are set to '1'.
111 4.3 Options "contrast", "colour", "brightness" and "whiteness"
113 The microdia Linux kernel module takes the following options
114 "contrast", "colour", "brightness" and "whiteness"
115 $ modprobe microdia contrast=0x7F00 colour=0x7F00
117 By default, the value of these options is set to '0x7F00'.
121 In the directory : /sys/class/video4linux/videoX (by sample video0), you
122 can read and write some parameters :
126 To display informations about driver :
129 It is a register editor implemented. You can display and change
130 the camera registers. To use this register editor see following
133 1) open a shell and move to your video device (normaly video0)
134 $ cd /sys/class/video4linux/video0
136 2) Set and display register adress 0x11b8
137 $ echo 11b8 > adr // set the adress value to 0x11b8
138 $ cat adr // command to display the adress value
141 3) display the value from register 0x11b8
142 $ cat reg // command to display the register value
143 $ 0x11b8 = 0x3a // output
145 4) Set value from register 0x11b8 to 0x10
151 5) I2C Interface: set read/write count,
152 (how many bytes we want to read/write = 1/2)
153 (we are using the adr value for this)
155 $ echo 1 > adr // we want only to read / write one byte
157 6) I2C Interface: set i2c slave to 0x30
158 $ echo 30 > i2cslave // set the I2c slave adress to 0x30
159 $ cat i2cslave // command to display the I2cadress value
162 7) I2C Interface: set i2c adress to 0x12
163 $ echo 12 > i2cadr // set the I2cadress value to 0x12
164 $ cat i2cadr // command to display the I2cadress value
168 Display I2c-register 0x12 (0x22 isn't valid, count is (1))
169 $ cat i2creg // command to display the I2c register value
170 $ I2C-register 0x12 = 0x40 0x22 (1)
172 9) I2C Interface: Set I2c-register
173 (you have to enter the values for 2 registers)
175 $ echo 4100 > i2creg // set the I2c register value to 0x41
176 $ cat i2creg // command to display the I2c register value
177 $ I2C-register 0x12 = 0x41 0x22 (1)
179 --------------------------------------------------------------------------------
183 The kernel module is currently under active development.
185 The driver supports following webcam models :
195 To request support/report an issue, please contact us on Microdia Mailing List:
197 https://groups.google.com/group/microdia/
199 --------------------------------------------------------------------------------
200 6. Documentation & References
202 All documentation & references for microdia webcam driver can be found at
203 https://groups.google.com/group/microdia/web
205 Latest version of this driver is usually available at the following location
206 http://repo.or.cz/w/microdia.git
207 --------------------------------------------------------------------------------
209 7. Debugging webcam driver problems
211 Check the status of webcam driver with the following command
216 [root@Dahlia driver]$ lsusb
217 Bus 005 Device 003: ID 0c45:624f Microdia <== Our Webcam
218 Bus 005 Device 001: ID 0000:0000
219 Bus 004 Device 001: ID 0000:0000
220 Bus 003 Device 002: ID 08ff:2580 AuthenTec, Inc.
221 Bus 003 Device 001: ID 0000:0000
222 Bus 002 Device 001: ID 0000:0000
223 Bus 001 Device 004: ID 0a5c:2101 Broadcom Corp.
224 Bus 001 Device 001: ID 0000:0000
226 [root@Dahlia driver]$ lsusb -d 0c45:624f -vvv > lsusb.txt
228 7.3. USB logs from Windows
229 There are 3 useful USB logs :
230 - Log 1 : when you plug your webcam
231 - Log 2 : when you run VideoView.exe (with the default settings)
232 - Log 3 : when you run VideoView.exe, then change the resolution to 1280x1024
234 7.4. USB logs from Linux
235 By using the kernel module usbmon (kernel option debugfs should be enabled)
236 $ sudo mount -t debugfs none_debugs /sys/kernel/debug
237 $ sudo modprobe usbmon
238 $ sudo modprobe videodev
239 $ sudo modprobe compat-ioctl32 //Only required for 64-bit Linux OS
240 $ sudo insmod microdia.ko
241 $ sudo cat /sys/kernel/debug/usbmon/_X_t > ~/Desktop/usbmon.log
243 Note: The _X_ refers to the "Bus #" of the webcam as reported when
244 the webcam is connected and we execute
247 `-Dev# 1 Vendor 0x0000 Product 0x0000
248 `-Dev# 6 Vendor 0x0c45 Product 0x624f
253 Hence, command for the above example becomes,
254 $ sudo cat /sys/kernel/debug/usbmon/6t
256 7.5. Enable module traces
257 You can enable : CONFIG_MICRODIA_DEBUG and CONFIG_MICRODIA_DEBUG_STREAM
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263 Microdia USB 2.0 Webcam Driver is distributed under
264 the GPL licence (version 2 or later).
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