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authorSascha Hauer <s.hauer@pengutronix.de>2015-12-11 12:11:26 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2016-01-07 08:46:09 +0100
commit06a524a16840fafd683bd1e66f9a7ea0b363258d (patch)
tree22ae6babf2e71b32fd6c8b4e23a7294017cdbdd1
parent616143ca8eeab42f5e043b0a86709622772cdc34 (diff)
downloadbarebox-06a524a16840fafd683bd1e66f9a7ea0b363258d.tar.gz
rtc: Add Abracon driver
This patch adds support for the Abracon ab-rtcmc-32.768khz-eoz9-s3 RTC. The driver can probably support other Abracon RTCs aswell, but this hasn't been verified. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r--drivers/rtc/Kconfig3
-rw-r--r--drivers/rtc/Makefile1
-rw-r--r--drivers/rtc/rtc-abracon.c126
3 files changed, 130 insertions, 0 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 191ad97..7d18194 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -33,6 +33,9 @@ config RTC_DRV_DS1307
registers may add features such as NVRAM, a trickle charger for
the RTC/NVRAM backup power, and alarms.
+config RTC_DRV_ABRACON
+ tristate "Abracon RTCs"
+
endif # I2C
config RTC_DRV_JZ4740
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 1cc9bb8..68741c2 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_RTC_CLASS) += class.o
# Keep the list ordered.
+obj-$(CONFIG_RTC_DRV_ABRACON) += rtc-abracon.o
obj-$(CONFIG_RTC_DRV_DS1307) += rtc-ds1307.o
obj-$(CONFIG_RTC_DRV_JZ4740) += rtc-jz4740.o
diff --git a/drivers/rtc/rtc-abracon.c b/drivers/rtc/rtc-abracon.c
new file mode 100644
index 0000000..b3af990
--- /dev/null
+++ b/drivers/rtc/rtc-abracon.c
@@ -0,0 +1,126 @@
+/*
+ * 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; version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <errno.h>
+#include <i2c/i2c.h>
+#include <rtc.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+
+struct abracon {
+ struct rtc_device rtc;
+ struct i2c_client *client;
+};
+
+static inline struct abracon *to_abracon_priv(struct rtc_device *rtcdev)
+{
+ return container_of(rtcdev, struct abracon, rtc);
+}
+
+static int abracon_get_time(struct rtc_device *rtcdev, struct rtc_time *t)
+{
+ struct abracon *abracon = to_abracon_priv(rtcdev);
+ struct i2c_client *client = abracon->client;
+ u8 cp[7] = {};
+ u8 reg = 8;
+ struct i2c_msg msg[2] = {};
+ int ret;
+
+ msg[0].addr = client->addr;
+ msg[0].buf = &reg;
+ msg[0].len = 1;
+
+ msg[1].addr = client->addr;
+ msg[1].flags = I2C_M_RD;
+ msg[1].buf = cp;
+ msg[1].len = 7;
+
+ ret = i2c_transfer(client->adapter, msg, 2);
+ if (ret != 2)
+ return -EIO;
+
+ t->tm_sec = bcd2bin(cp[0]);
+ t->tm_min = bcd2bin(cp[1]);
+ t->tm_hour = bcd2bin(cp[2]);
+ t->tm_mday = bcd2bin(cp[3]);
+ t->tm_wday = bcd2bin(cp[4]);
+ t->tm_mon = bcd2bin(cp[5]);
+ t->tm_year = bcd2bin(cp[6]) + 100;
+
+ return 0;
+}
+
+static int abracon_set_time(struct rtc_device *rtcdev, struct rtc_time *t)
+{
+ struct abracon *abracon = to_abracon_priv(rtcdev);
+ struct i2c_client *client = abracon->client;
+ u8 cp[8] = {};
+ int ret;
+
+ cp[0] = 8;
+ cp[1] = bin2bcd(t->tm_sec);
+ cp[2] = bin2bcd(t->tm_min);
+ cp[3] = bin2bcd(t->tm_hour);
+ cp[4] = bin2bcd(t->tm_mday);
+ cp[5] = bin2bcd(t->tm_wday);
+ cp[6] = bin2bcd(t->tm_mon);
+ cp[7] = bin2bcd(t->tm_year - 100);
+
+ ret = i2c_master_send(client, cp, 8);
+ if (ret != 8)
+ return -EIO;
+
+ return 0;
+}
+
+static const struct rtc_class_ops ds13xx_rtc_ops = {
+ .read_time = abracon_get_time,
+ .set_time = abracon_set_time,
+};
+
+static int abracon_probe(struct device_d *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct abracon *abracon;
+ int ret;
+
+ abracon = xzalloc(sizeof(*abracon));
+
+ abracon->client = client;
+
+ abracon->rtc.ops = &ds13xx_rtc_ops;
+ abracon->rtc.dev = dev;
+
+ ret = rtc_register(&abracon->rtc);
+
+ return ret;
+};
+
+static struct platform_device_id abracon_id[] = {
+ { "ab-rtcmc-32.768khz-eoz9-s3", 0 },
+ { }
+};
+
+static struct driver_d abracon_driver = {
+ .name = "rtc-abracon",
+ .probe = abracon_probe,
+ .id_table = abracon_id,
+};
+
+static int __init abracon_init(void)
+{
+ return i2c_driver_register(&abracon_driver);
+}
+device_initcall(abracon_init); \ No newline at end of file