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rtc: add generic nvmem support

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Many RTCs have an on board non volatile storage. It can be battery backed
RAM or an EEPROM. Use the nvmem subsystem to export it to both userspace
and in-kernel consumers.

This stays compatible with the previous (non documented) ABI that was using
/sys/class/rtc/rtcx/device/nvram to export that memory. But will warn about
the deprecation.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Alexandre Belloni
2017-07-06 11:42:02 +02:00
parent 735ae2056b
commit 697e5a47aa
7 changed files with 143 additions and 0 deletions
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7
include/linux/rtc.h
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@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/nvmem-provider.h>
#include <uapi/linux/rtc.h>
extern int rtc_month_days(unsigned int month, unsigned int year);
@@ -144,6 +145,12 @@ struct rtc_device {
bool registered;
struct nvmem_config *nvmem_config;
struct nvmem_device *nvmem;
/* Old ABI support */
bool nvram_old_abi;
struct bin_attribute *nvram;
#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
struct work_struct uie_task;
struct timer_list uie_timer;