| 1 | SMBUS_ARP Driver |
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| 2 | ------------- |
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| 3 | This is a demonstration driver which provides SMBus 2.0 |
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| 4 | ARP services. It isn't much use except for testing SMBus 2.0 |
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| 5 | ARP and PEC support in the i2c layer. |
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| 6 | It is NOT a normal 'chip' driver for a particular sensor device. |
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| 7 | If you don't know what SMBus ARP is you don't need this driver. |
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| 8 | |
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| 9 | |
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| 10 | Stability |
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| 11 | --------- |
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| 12 | Beta. |
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| 13 | |
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| 14 | |
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| 15 | DETECTION |
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| 16 | ------------- |
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| 17 | This driver requires SMBus 2.0 support in i2c-2.6.4 or higher. |
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| 18 | If your kernel does not have i2c-2.6.4 or higher the module |
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| 19 | will refuse to load. |
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| 20 | |
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| 21 | This driver will register itself on each i2c bus which |
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| 22 | supports SMBus Block Data transactions. |
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| 23 | |
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| 24 | |
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| 25 | USES |
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| 26 | ---- |
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| 27 | The module ARPs each supported bus when it is inserted |
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| 28 | (or after that when a i2c bus driver is inserted). |
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| 29 | It does not periodically re-ARP, and the i2c stack does not |
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| 30 | currently support SMBus Host Notify, so it will not detect |
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| 31 | hot-plugged devices. |
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| 32 | |
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| 33 | The smbus-arp module should be inserted before any chip modules |
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| 34 | so that it has an opportunity to assign addresses. |
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| 35 | |
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| 36 | |
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| 37 | /PROC ENTRIES |
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| 38 | ------------- |
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| 39 | There are 8 entries in /proc, 0-7. Each is a 'slot'. |
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| 40 | If a chip has responded to ARP, it will appear in a 'slot' |
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| 41 | as follows. See the SMBus 2.0 Specification for details. |
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| 42 | |
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| 43 | value function |
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| 44 | 1 SMBus address |
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| 45 | 2 UDID Device Capabilities |
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| 46 | 3 UDID Version / Revision |
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| 47 | 4 UDID Vendor ID |
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| 48 | 5 UDID Device ID |
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| 49 | 6 UDID Interface |
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| 50 | 7 UDID Subsystem Vendor ID |
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| 51 | 8 UDID Subsystem Device ID |
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| 52 | 9 UDID Vendor Specific ID |
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| 53 | |
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| 54 | To reassign a device to a different address, write |
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| 55 | that address to the slot. For example, 'echo 13 > 0' |
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| 56 | to reassign the device in slot 0 to address 13 (0x0d). |
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| 57 | |
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| 58 | |
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| 59 | TO DO |
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| 60 | ----- |
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| 61 | lots |
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| 62 | |
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| 63 | Author/Maintainer |
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| 64 | ----------------- |
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| 65 | Mark D. Studebaker (mdsxyz123@yahoo.com) |
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| 66 | |
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