Pixart 7302 Driver - softpics48’s blog

Pixart pac7302 driver mac. Over the last three years under Reads leadership, but Touch ID might be the best new thing launched under Cook s driver, why it is doing.

PixArt was founded in July 1998 specializing in CMOS image sensors and related IC design, research, production, and Sales. PixArt has extensive experience in analog.
PAC7301/PAC7302 All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms withou t permission.

The PAC7301/PAC7302 is a VGA output PC Camera SOC with embedded CMOS image sensor and USB 1.1 interface. It embedded a JPEG image compression engine and an image signal processor ISP. The JPEG decoder and auto exposure control are performed by software in PC side. The PAC7301/PAC7302 can achieve a compact module size by using it s 1/6 optical size.

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PixArt PAC7301/PAC7302 is a System on a Chip SoC with multimedia sensor capabilities. The chip is supported by the gspca_pac7302 kernel module.

CMOS VGA sensor 640x480 for video and still image capturing

Microphone input only on PixArt PAC7302

The webcams based on the PixArt PAC7301/PAC7302 chip usually consists only of the chip and some external resistors, capacitors, button and a microphone.

The USB Vendor ID and Product ID can be programmed. The Product ID range of 0x2620..0x262F is mentioned on the schematics in the PixArt PAC7301/PAC7302 datasheet.

The gspca_pac7302 driver supports the following devices:

The webcam driver may also support the following devices with only a little modification. The webcam drivers for Windows installs the pac7302.sys file. It is possible to download the driver and install it under Linux using wine. If this driver file is installed then we know that the webcam is based on the PixArt PAC7301/PAC7302. Then it is necesary to check the pac7302.inf file to find out the USB Vendor ID and USB Device ID for a specific webcam. The following table summarizes the devices identified with this method.

Identified from the driver installed with wine-1.1.37

Identified from the driver installed with wine-1.0.1. See the installed windows/inf/facecam300.inf.

The Labtec Webcam 2200 is an device which contains the PixArt PAC7302 chip. The identification of this device is as follows:

Bus 003 Device 002: ID 093a:2626 Pixart Imaging, Inc.

bDeviceClass 0 Defined at Interface level

idVendor 0x093a Pixart Imaging, Inc.

bInterfaceClass 255 Vendor Specific Class

bInterfaceSubClass 255 Vendor Specific Subclass

bInterfaceProtocol 255 Vendor Specific Protocol

wMaxPacketSize 0x0040 1x 64 bytes

bEndpointAddress 0x02 EP 2 OUT

wMaxPacketSize 0x0002 1x 2 bytes

bEndpointAddress 0x04 EP 4 OUT

wMaxPacketSize 0x0000 1x 0 bytes

bEndpointAddress 0x06 EP 6 OUT

wMaxPacketSize 0x0080 1x 128 bytes

wMaxPacketSize 0x0100 1x 256 bytes

wMaxPacketSize 0x0180 1x 384 bytes

wMaxPacketSize 0x0200 1x 512 bytes

wMaxPacketSize 0x0280 1x 640 bytes

wMaxPacketSize 0x0300 1x 768 bytes

wMaxPacketSize 0x0380 1x 896 bytes

wMaxPacketSize 0x03ff 1x 1023 bytes

bInterfaceSubClass 1 Control Device

AudioControl Interface Descriptor:

bDescriptorSubtype 2 INPUT_TERMINAL

wTerminalType 0x0201 Microphone

bDescriptorSubtype 6 FEATURE_UNIT

bDescriptorSubtype 3 OUTPUT_TERMINAL

wTerminalType 0x0101 USB Streaming

bInterfaceSubClass 2 Streaming

AudioStreaming Interface Descriptor:

bDescriptorSubtype 1 AS_GENERAL

bDescriptorSubtype 2 FORMAT_TYPE

wMaxPacketSize 0x0020 1x 32 bytes

AudioControl Endpoint Descriptor:

bDescriptorSubtype 1 EP_GENERAL

wMaxPacketSize 0x0060 1x 96 bytes

To use this device the following components are necessary:

No firmware is necessary to use this device.

The gspca_pac7302 driver was separated from the gspca_pac7311 with the commit 1408b8472910e894b290205b4baed5b14b8f45af.

If you have a kernel version 2.6.32 or before then use gspca_pac7311 instead of gspca_pac7302.

The support for snapshot button is available since 28 Jan 2010 in one of the repositories. The patch was merged as commit aed6f1b5fe4e95cf8a9fc149e25041aa8cc7c78a to the mailine and it is included in Linux kernel starting with the stable release 2.6.37, released on 4 Jan 2011.

This is the kernel output when the Labtec Webcam 2200 is plugged in. You may recognise the pac7302 driver and the snd-usb-audio driver attaching themselves to the device.

2568.748414 usb 3-1: new full speed USB device using uhci_hcd and address 2

2569.225907 Linux video capture interface: v2.00

2569.269819 gspca: main v2.8.0 registered

2569.311677 gspca: probing 093a:2626

2569.333006 gspca: video0 created

2569.334721 gspca: probing 093a:2626

2569.336295 gspca: probing 093a:2626

2569.352270 usbcore: registered new interface driver pac7302

2569.352285 pac7302: registered

2569.654995 usbcore: registered new interface driver snd-usb-audio

Note: this chapter is based on the Linux gspca_pac7302 driver and on trial-and error. Use information here on your risk.

The PAC7301/PAC7302 can be controlled through registers. The registers are grouped to pages of 256 registers. The registers can be written by sending an USB control message to the device. The value parameter of usb_control_msg is always zero; the index parameter specifies the offset within a page; the data and length parameters specify the register content to be written.

The different register pages can be switched by writing the new page value to offset 255 of any page.

Start/stop streaming, LED control

setcolors, setgain, setexposure, sethvflip

Activates edge detection image filter

0: normal operation, test overlay generation off

0x0: normal operation, test pattern generation off

0x1: generate white test pattern: the whole image is white

0x2: generate black test pattern: the whole image is black

0x3: generate red test pattern: the whole image is red

0x4: generate lime test pattern: the whole image is lime

0x5: generate blue test pattern: the whole image is blue

0x6: generate aqua test pattern: the whole image is aqua

0x7: generate fuchsia test pattern: the whole image is fuchsia

0x8: generate yellow test pattern: the whole image is yellow

0x9: generate test pattern with colored horizontal and vertical bars

0xA: generate test pattern with small colored pixels all around the image

0xB: generate a gradient test pattern starting from black on the top and bright color on the bottom

0xC: generate a gradient test pattern starting from white on the left towards black on the right

0xD: generate frequent vertical gadient bars white to black, from left to right

0xE: generate black test pattern: the whole image is black

0xF: generate black test pattern: the whole image is black

These test patterns can be generated when the gspca_pac7302 driver is built with CONFIG_VIDEO_ADV_DEBUG y. First start streaming e.g. with cheese then execute v4l2-dbg --set-register 0x72 0x01 for value 0x01. These test patterns were generated using Labtec Webcam 2200 hardware.

Value 0x1: generate white test pattern:

Value 0x2: generate black test pattern:

Value 0x3: generate red test pattern:

Value 0x4: generate lime test pattern:

Value 0x5: generate blue test pattern:

Value 0x6: generate aqua test pattern:

Value 0x7: generate fuchsia test pattern:

Value 0x8: generate yellow test pattern:

Value 0x9: generate test pattern with colored horizontal and vertical bars:

Value 0xA: generate test pattern with small colored pixels all around the image:

Value 0xB: generate a gradient test pattern starting from black on the top and bright color on the bottom:

Value 0xC: generate a gradient test pattern starting from white on the left towards black on the right: