i2c: New Xicor X1205 RTC driver
PATCH 8/14 i2c: New Xicor X1205 RTC driver
From: Alessandro Zummo <[email protected]>
Content-Disposition: inline; filename=i2c-x1205.patch
New driver for the Xicor X1205 RTC chip.
Signed-off-by Alessandro Zummo <[email protected]>
Signed-off-by Jean Delvare <[email protected]>
--- Documentation/i2c/chips/x1205 | 38 ++ drivers/i2c/chips/Kconfig | 9 + drivers/i2c/chips/Makefile | 1 + drivers/i2c/chips/x1205.c | 698 +++++++++++++++++++++++++++++++++++++++++ include/linux/x1205.h | 31 ++ 5 files changed, 777 insertions(+)
drivers/i2c/chips/Kconfig +9 -0
@@ -126,4 +126,13 @@ This driver can also be built as a module. If so, the module will be called max6875. +config RTC_X1205_I2C + tristate "Xicor X1205 RTC chip" + depends on I2C && EXPERIMENTAL + help + If you say yes here you get support for the Xicor X1205 RTC chip. + + This driver can also be built as a module. If so, the module + will be called x1205. + endmenu
drivers/i2c/chips/Makefile +1 -0
@@ -13,6 +13,7 @@ obj-$(CONFIG_SENSORS_RTC8564) += rtc8564.o obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o obj-$(CONFIG_TPS65010) += tps65010.o +obj-$(CONFIG_RTC_X1205_I2C) += x1205.o ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) EXTRA_CFLAGS += -DDEBUG
drivers/i2c/chips/x1205.c new file +697 -0
697 lines not on this page · raw message
include/linux/x1205.h new file +31 -0
@@ -0,0 +1,31 @@ +/* +* x1205.h - defines for drivers/i2c/chips/x1205.c +* Copyright 2004 Karen Spearel +* Copyright 2005 Alessandro Zummo +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +*/ + +#ifndef __LINUX_X1205_H__ +#define __LINUX_X1205_H__ + +/* commands */ + +#define X1205_CMD_GETDATETIME 0 +#define X1205_CMD_SETTIME 1 +#define X1205_CMD_SETDATETIME 2 +#define X1205_CMD_GETALARM 3 +#define X1205_CMD_SETALARM 4 +#define X1205_CMD_GETDTRIM 5 +#define X1205_CMD_SETDTRIM 6 +#define X1205_CMD_GETATRIM 7 +#define X1205_CMD_SETATRIM 8 + +extern int x1205_do_command (unsigned int cmd,void *arg); +extern int x1205_direct_attach (int adapter_id, +struct i2c_client_address_data *address_data); + +#endif /* __LINUX_X1205_H__ */
Documentation/i2c/chips/x1205 new file +37 -0
@@ -0,0 +1,38 @@ +Kernel driver x1205 +=========+ +Supported chips: + * Xicor X1205 RTC + Prefix: 'x1205' + Addresses scanned: none + Datasheet: http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html + +Authors: + Karen Spearel <[email protected]>, + Alessandro Zummo <[email protected]> + +Description +----------- + +This module aims to provide complete access to the Xicor X1205 RTC. +Recently Xicor has merged with Intersil, but the chip is +still sold under the Xicor brand. + +This chip is located at address 0x6f and uses a 2-byte register addressing. +Two bytes need to be written to read a single register, while most +other chips just require one and take the second one as the data +to be written. To prevent corrupting unknown chips, the user must +explicitely set the probe parameter. + +example: + +modprobe x1205 probe=0,0x6f + +The module supports one more option, hctosys, which is used to set the +software clock from the x1205. On systems where the x1205 is the +only hardware rtc, this parameter could be used to achieve a correct +date/time earlier in the system boot sequence. + +example: + +modprobe x1205 probe=0,0x6f hctosys=1
Signature · 1 line
Jean Delvare