| Alessandro Zummo | 4d4e5ce | 2005-10-17 23:04:42 +0200 | [diff] [blame] | 1 | Kernel driver x1205 |
| 2 | =================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Xicor X1205 RTC |
| 6 | Prefix: 'x1205' |
| 7 | Addresses scanned: none |
| 8 | Datasheet: http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html |
| 9 | |
| 10 | Authors: |
| 11 | Karen Spearel <kas11@tampabay.rr.com>, |
| 12 | Alessandro Zummo <a.zummo@towertech.it> |
| 13 | |
| 14 | Description |
| 15 | ----------- |
| 16 | |
| 17 | This module aims to provide complete access to the Xicor X1205 RTC. |
| 18 | Recently Xicor has merged with Intersil, but the chip is |
| 19 | still sold under the Xicor brand. |
| 20 | |
| 21 | This chip is located at address 0x6f and uses a 2-byte register addressing. |
| 22 | Two bytes need to be written to read a single register, while most |
| 23 | other chips just require one and take the second one as the data |
| 24 | to be written. To prevent corrupting unknown chips, the user must |
| 25 | explicitely set the probe parameter. |
| 26 | |
| 27 | example: |
| 28 | |
| 29 | modprobe x1205 probe=0,0x6f |
| 30 | |
| 31 | The module supports one more option, hctosys, which is used to set the |
| 32 | software clock from the x1205. On systems where the x1205 is the |
| 33 | only hardware rtc, this parameter could be used to achieve a correct |
| 34 | date/time earlier in the system boot sequence. |
| 35 | |
| 36 | example: |
| 37 | |
| 38 | modprobe x1205 probe=0,0x6f hctosys=1 |