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Message-Id: <1425150876-8141-1-git-send-email-alexandre.belloni@free-electrons.com>
Date: Sat, 28 Feb 2015 20:14:36 +0100
From: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To: Alessandro Zummo <a.zummo@...ertech.it>
Cc: linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCH] rtc: add Abracon ABx80x driver
Add support for the i2c RTC from Abracon.
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
drivers/rtc/Kconfig | 9 +++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-abx80x.c | 203 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 213 insertions(+)
create mode 100644 drivers/rtc/rtc-abx80x.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index b5b5c3d485d6..e230722fce49 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -174,6 +174,15 @@ config RTC_DRV_AS3722
This driver can also be built as a module. If so, the module
will be called rtc-as3722.
+config RTC_DRV_ABX80X
+ tristate "Abracon ABx80x"
+ help
+ If you say yes here you get support for Abracon AB080x and AB180x
+ real-time clock chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-abx80x.
+
config RTC_DRV_DS1307
tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 69c87062b098..e8e60c2c8aeb 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -22,6 +22,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
obj-$(CONFIG_RTC_DRV_88PM860X) += rtc-88pm860x.o
obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o
+obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o
obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
new file mode 100644
index 000000000000..e51ac5554a9e
--- /dev/null
+++ b/drivers/rtc/rtc-abx80x.c
@@ -0,0 +1,203 @@
+/*
+ * An I2C driver for the Abracon AB08xx
+ *
+ * Author: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
+ *
+ * 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 <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/bcd.h>
+#include <linux/rtc.h>
+#include <linux/log2.h>
+
+#define AB08XX_REG_HTH 0x00
+#define AB08XX_REG_SC 0x01
+#define AB08XX_REG_MN 0x02
+#define AB08XX_REG_HR 0x03
+#define AB08XX_REG_DA 0x04
+#define AB08XX_REG_MO 0x05
+#define AB08XX_REG_YR 0x06
+#define AB08XX_REG_WD 0x07
+
+#define AB08XX_REG_CTRL1 0x10
+
+#define AB08XX_REG_PART0 0x28
+#define AB08XX_REG_PART1 0x29
+
+#define AB08XX_CTRL_WRITE BIT(1)
+#define AB08XX_CTRL_12_24 BIT(6)
+
+enum ab08xx_chip {ABX80X, AB0801, AB0802, AB0803, AB0804, AB0805,
+ AB1801, AB1802, AB1803, AB1804, AB1805};
+
+static int ab08xx_get_datetime(struct i2c_client *client, struct rtc_time *tm)
+{
+ unsigned char date[8];
+ int err;
+
+ /* Now read time and date */
+ err = i2c_smbus_read_i2c_block_data(client, AB08XX_REG_HTH,
+ 8, date);
+ if (err < 0) {
+ dev_err(&client->dev, "Unable to read date\n");
+ return -EIO;
+ }
+
+ tm->tm_sec = bcd2bin(date[AB08XX_REG_SC] & 0x7F);
+ tm->tm_min = bcd2bin(date[AB08XX_REG_MN] & 0x7F);
+ tm->tm_hour = bcd2bin(date[AB08XX_REG_HR] & 0x3F);
+ tm->tm_wday = date[AB08XX_REG_WD] & 0x7;
+ tm->tm_mday = bcd2bin(date[AB08XX_REG_DA] & 0x3F);
+ tm->tm_mon = bcd2bin(date[AB08XX_REG_MO] & 0x1F) - 1;
+ tm->tm_year = bcd2bin(date[AB08XX_REG_YR]);
+ if (tm->tm_year < 70)
+ tm->tm_year += 100;
+
+ err = rtc_valid_tm(tm);
+ if (err < 0)
+ dev_err(&client->dev, "retrieved date/time is not valid.\n");
+
+ return err;
+}
+
+static int ab08xx_set_datetime(struct i2c_client *client, struct rtc_time *tm)
+{
+ int data, err;
+ unsigned char buf[8];
+
+ buf[AB08XX_REG_SC] = bin2bcd(tm->tm_sec);
+ buf[AB08XX_REG_MN] = bin2bcd(tm->tm_min);
+ buf[AB08XX_REG_HR] = bin2bcd(tm->tm_hour);
+ buf[AB08XX_REG_DA] = bin2bcd(tm->tm_mday);
+ buf[AB08XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
+ buf[AB08XX_REG_YR] = bin2bcd(tm->tm_year % 100);
+ buf[AB08XX_REG_WD] = (0x1 << tm->tm_wday);
+
+ data = i2c_smbus_read_byte_data(client, AB08XX_REG_CTRL1);
+ if (data < 0) {
+ dev_err(&client->dev, "Unable to read control register\n");
+ return -EIO;
+ }
+
+ err = i2c_smbus_write_byte_data(client, AB08XX_REG_CTRL1,
+ (data | AB08XX_CTRL_WRITE));
+ if (err < 0) {
+ dev_err(&client->dev, "Unable to write control register\n");
+ return -EIO;
+ }
+
+ err = i2c_smbus_write_i2c_block_data(client, AB08XX_REG_SC, 7,
+ &buf[AB08XX_REG_SC]);
+ if (err < 0) {
+ dev_err(&client->dev, "Unable to write to date registers\n");
+ return -EIO;
+ }
+
+ err = i2c_smbus_write_byte_data(client, AB08XX_REG_CTRL1,
+ (data & ~AB08XX_CTRL_WRITE));
+ if (err < 0) {
+ dev_err(&client->dev, "Unable to write control register\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ab08xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ return ab08xx_get_datetime(to_i2c_client(dev), tm);
+}
+
+static int ab08xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ return ab08xx_set_datetime(to_i2c_client(dev), tm);
+}
+
+static const struct rtc_class_ops ab08xx_rtc_ops = {
+ .read_time = ab08xx_rtc_read_time,
+ .set_time = ab08xx_rtc_set_time,
+};
+
+static int ab08xx_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct rtc_device *rtc;
+ int data, err, part0, part1;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -ENODEV;
+
+
+ part0 = i2c_smbus_read_byte_data(client, AB08XX_REG_PART0);
+ part1 = i2c_smbus_read_byte_data(client, AB08XX_REG_PART1);
+ if ((part0 < 0) || (part1 < 0)) {
+ dev_err(&client->dev, "Unable to read part number\n");
+ return -EIO;
+ }
+ dev_info(&client->dev, "chip found %2x%2x\n", part0, part1);
+
+ data = i2c_smbus_read_byte_data(client, AB08XX_REG_CTRL1);
+ if (data < 0) {
+ dev_err(&client->dev, "Unable to read control register\n");
+ return -EIO;
+ }
+
+ err = i2c_smbus_write_byte_data(client, AB08XX_REG_CTRL1,
+ (data & ~AB08XX_CTRL_12_24));
+ if (err < 0) {
+ dev_err(&client->dev, "Unable to write control register\n");
+ return -EIO;
+ }
+
+ rtc = devm_rtc_device_register(&client->dev, "rtc-ab08xx",
+ &ab08xx_rtc_ops, THIS_MODULE);
+
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
+ i2c_set_clientdata(client, rtc);
+
+ return 0;
+}
+
+static int ab08xx_remove(struct i2c_client *client)
+{
+ return 0;
+}
+
+static const struct i2c_device_id ab08xx_id[] = {
+ { "abx80x", ABX80X },
+ { "ab0801", AB0801 },
+ { "ab0802", AB0802 },
+ { "ab0803", AB0803 },
+ { "ab0804", AB0804 },
+ { "ab0805", AB0805 },
+ { "ab1801", AB1801 },
+ { "ab1802", AB1802 },
+ { "ab1803", AB1803 },
+ { "ab1804", AB1804 },
+ { "ab1805", AB1805 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ab08xx_id);
+
+static struct i2c_driver ab08xx_driver = {
+ .driver = {
+ .name = "rtc-ab08xx",
+ .owner = THIS_MODULE,
+ },
+ .probe = ab08xx_probe,
+ .remove = ab08xx_remove,
+ .id_table = ab08xx_id,
+};
+
+module_i2c_driver(ab08xx_driver);
+
+MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@...e-electrons.com>");
+MODULE_DESCRIPTION("Abracon AB08xx RTC driver");
+MODULE_LICENSE("GPL");
--
2.1.0
--
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