This is a new-style i2c driver for ST M41T80 series RTC chip, derived
from works by Alexander Bigga <[EMAIL PROTECTED]> who wrote the original
rtc-m41txx.c based on drivers/i2c/chips/m41t00.c driver.
This driver supports M41T8[0-4] and M41ST8[457]. The old m41t00
driver supports M41T00, M41T81 and M41T85(M41ST85). While the M41T00
chip is now supported by rtc-ds1307 driver, this driver does not
include support for the chip.
Signed-off-by: Atsushi Nemoto <[EMAIL PROTECTED]>
Signed-off-by: Alexander Bigga <[EMAIL PROTECTED]>
Acked-by: Mark A. Greer <[EMAIL PROTECTED]>
---
Changes from previous version (v0.04):
* Add "sqwfreq" sysfs attribute
* Remove m41t80.h
* Fix handling of return value from i2c_smbus_read_byte_data()
drivers/rtc/Kconfig | 12 +
drivers/rtc/Makefile |1 +
drivers/rtc/rtc-m41t80.c | 629 ++
3 files changed, 642 insertions(+), 0 deletions(-)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 4e4c10a..03d2b1d 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -282,6 +282,18 @@ config RTC_DRV_DS1742
This driver can also be built as a module. If so, the module
will be called rtc-ds1742.
+config RTC_DRV_M41T80
+ tristate "ST M41T80 series RTC"
+ depends on RTC_CLASS && I2C
+ help
+ If you say Y here you will get support for the
+ ST M41T80 RTC chips series. Currently following chips are
+ supported: M41T80, M41T81, M41T82, M41T83, M41ST84, M41ST85
+ and M41ST87.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-m41t80.
+
config RTC_DRV_M48T86
tristate "ST M48T86/Dallas DS12887"
depends on RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index a1afbc2..d1dc270 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_RTC_DRV_PCF8583) += rtc-pcf8583.o
obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
obj-$(CONFIG_RTC_DRV_S3C) += rtc-s3c.o
obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
+obj-$(CONFIG_RTC_DRV_M41T80) += rtc-m41t80.o
obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o
obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
new file mode 100644
index 000..51d8da8
--- /dev/null
+++ b/drivers/rtc/rtc-m41t80.c
@@ -0,0 +1,629 @@
+/*
+ * I2C client/driver for the ST M41T80 family of i2c rtc chips.
+ *
+ * Author: Alexander Bigga <[EMAIL PROTECTED]>
+ *
+ * Based on m41t00.c by Mark A. Greer <[EMAIL PROTECTED]>
+ *
+ * 2006 (c) mycable GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#define M41T80_REG_SSEC0
+#define M41T80_REG_SEC 1
+#define M41T80_REG_MIN 2
+#define M41T80_REG_HOUR3
+#define M41T80_REG_WDAY4
+#define M41T80_REG_DAY 5
+#define M41T80_REG_MON 6
+#define M41T80_REG_YEAR7
+#define M41T80_REG_ALARM_MON 0xa
+#define M41T80_REG_ALARM_DAY 0xb
+#define M41T80_REG_ALARM_HOUR 0xc
+#define M41T80_REG_ALARM_MIN 0xd
+#define M41T80_REG_ALARM_SEC 0xe
+#define M41T80_REG_FLAGS 0xf
+#define M41T80_REG_SQW 0x13
+
+#define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1)
+#define M41T80_ALARM_REG_SIZE \
+ (M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON)
+
+#define M41T80_SEC_ST (1 << 7)/* ST: Stop Bit */
+#define M41T80_ALMON_AFE (1 << 7)/* AFE: AF Enable Bit */
+#define M41T80_ALMON_SQWE (1 << 6)/* SQWE: SQW Enable Bit */
+#define M41T80_ALHOUR_HT (1 << 6)/* HT: Halt Update Bit */
+#define M41T80_FLAGS_AF(1 << 6)/* AF: Alarm Flag Bit */
+#define M41T80_FLAGS_BATT_LOW (1 << 4)/* BL: Battery Low Bit */
+
+#define M41T80_FEATURE_HT (1 << 0)
+#define M41T80_FEATURE_BL (1 << 1)
+
+#define DRV_VERSION "0.05"
+
+struct m41t80_chip_info {
+ const char *name;
+ u8 features;
+};
+
+static const struct m41t80_chip_info m41t80_chip_info_tbl[] = {
+ {
+ .name = "m41t80",
+ .features = 0,
+ },
+ {
+ .name = "m41t81",
+ .features = M41T80_FEATURE_HT,
+ },
+ {
+ .name = "m41t81s",
+ .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
+ },
+ {
+ .name = "m41t82",
+ .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
+ },
+ {
+ .name = "m41t83",
+ .features = M41T80_FEATURE_HT | M41T80_FEATURE_BL,
+ },
+ {
+ .name
