Intel Integrated Sensor Hub (ISH)A sensor hub enables the ability to offload sensor polling and algorithmprocessing to a dedicated low power co-processor. This allows the coreprocessor to go into low power modes more often, resulting in the increasedbattery life.There are many vendors providing external sensor hubs confirming to HIDSensor usage tables, and used in several tablets, 2 in 1 convertible laptopsand embedded products. Linux had this support since Linux 3.9.Intel® introduced integrated sensor hubs as a part of the SoC starting fromCherry Trail and now supported on multiple generations of CPU packages. Thereare many commercial devices already shipped with Integrated Sensor Hubs (ISH).These ISH also comply to HID sensor specification, but the difference is thetransport protocol used for communication. The current external sensor hubsmainly use HID over i2C or USB. But ISH doesn’t use either i2c or USB. TX and RX of Transport messagesA set of memory mapped register offers support of multi byte messages TX andRX (E.g.IPCREGISH2HOSTMSG, IPCREGHOST2ISHMSG).

The IPC layer maintainsinternal queues to sequence messages and send them in order to the FW.Optionally the caller can register handler to get notification of completion.A door bell mechanism is used in messaging to trigger processing in host andclient firmware side. When ISH interrupt handler is called, the ISH2HOSTdoorbell register is used by host drivers to determine that the interruptis for ISH.Each side has 32 32-bit message registers and a 32-bit doorbell. Doorbellregister has the following format:Bits 0.6: fragment length (7 bits are used)Bits 10.13: encapsulated protocolBits 16.19: management command (for IPC management protocol)Bit 31: doorbell trigger (signal H/W interrupt to the other side)Other bits are reserved, should be 0. 3.3.2 Connection and Flow Control MechanismEach FW client and a protocol is identified by an UUID. In order to communicateto a FW client, a connection must be established using connect request andresponse bus messages. If successful, a pair (hostclientid and fwclientid)will identify the connection.Once connection is established, peers send each other flow control bus messagesindependently.

Every peer may send a message only if it has received aflow-control credit before. Once it sent a message, it may not send another onebefore receiving the next flow control credit.Either side can send disconnect request bus message to end communication. Alsothe link will be dropped if major FW reset occurs.

3.3.3 Peer to Peer data transferPeer to Peer data transfer can happen with or without using DMA. Depending onthe sensor bandwidth requirement DMA can be enabled by using module parameterishtpusedma under intelishtp.Each side (host and FW) manages its DMA transfer memory independently. When anISHTP client from either host or FW side wants to send something, it decideswhether to send over IPC or over DMA; for each transfer the decision isindependent.

The sending side sends DMAXFER message when the message is inthe respective host buffer (TX when host client sends, RX when FW clientsends). 3.3.4 Ring BuffersWhen a client initiate a connection, a ring or RX and TX buffers are allocated.The size of ring can be specified by the client. HID client set 16 and 32 forTX and RX buffers respectively. On send request from client, the data to besent is copied to one of the send ring buffer and scheduled to be sent usingbus message protocol. These buffers are required because the FW may have nothave processed the last message and may not have enough flow control creditsto send.

Sep 5, 2014 - Intel® Atom™/Celeron®/Pentium® Processor Lower Power Subsystem DMA. Intel® Processor Win7 IO. This download installs the System-on-a-Chip (SOC) drivers for Intel® Compute Stick STCK1A32WFC, for the following system devices: Which file to choose? Download the file that applies to your operating system: SOCBYTWin8.132.zip - For Windows 8.1, 32-bit. SOCBYTWin1032.zip - For Windows® 10, 32-bit. Not sure if this is the right driver.

Same thing holds true on receive side and flow control is required. 3.3.5 Host EnumerationThe host enumeration bus command allow discovery of clients present in the FW.There can be multiple sensor clients and clients for calibration function.To ease in implantation and allow independent driver handle each clientthis transport layer takes advantage of Linux Bus driver model.

Eachclient is registered as device on the the transport bus (ishtp bus).Enumeration sequence of messages:. Host sends HOSTSTARTREQCMD, indicating that host ISHTP layer is up. FW responds with HOSTSTARTRESCMD. Host sends HOSTENUMREQCMD (enumerate FW clients). FW responds with HOSTENUMRESCMD that includes bitmap of available FWclient IDs.

For each FW ID found in that bitmap host sendsHOSTCLIENTPROPERTIESREQCMD. FW responds with HOSTCLIENTPROPERTIESRESCMD. Properties include UUID,max ISHTP message size, etc. Once host received properties for that last discovered client, it considersISHTP device fully functional (and allocates DMA buffers). HID-ISH-CLN ISHTP IPC HW -WAKE UP- -HOST READY- -HOSTENUMREQCMD- - CLIENTCONNECTREQCMD-.Response for each enumerated device ishtpclsend(HOSTIFGETREPORTDESCRIPTOR -fill ishtpmsghdr struct write to HW- hidallocatedevice hidadddevice.

PurposeInstalls the I/O controllers driver version 603.9600.1948.32979 on Intel® NUCs. This package provides drivers for the following processor features:.

GPIO Controller. UART Host Controller. I2C Controller. SPI ControllerWhich file to choose?. PROCIOWin8.132603.9600.1948.32979.zip - for 32-bit versions of the operating system. PROCIOWin8.164603.9600.1948.32979.zip - for 64-bit versions of the operating systemNot sure if this is the right driver for your Intel® NUC?Run to automatically detect updates. This download is valid for the product(s) listed below.

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