248 lines
6.9 KiB
Diff
248 lines
6.9 KiB
Diff
--- a/drivers/rtc/Kconfig
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+++ b/drivers/rtc/Kconfig
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@@ -488,6 +488,15 @@ config RTC_DRV_RV3029C2
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This driver can also be built as a module. If so, the module
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will be called rtc-rv3029c2.
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+config RTC_DRV_PT7C4338
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+ tristate "Pericom Technology Inc. PT7C4338 RTC"
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+ help
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+ If you say yes here you get support for the Pericom Technology
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+ Inc. PT7C4338 RTC chip.
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called rtc-pt7c4338.
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+
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endif # I2C
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comment "SPI RTC drivers"
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--- a/drivers/rtc/Makefile
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+++ b/drivers/rtc/Makefile
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@@ -92,6 +92,7 @@ obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030
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obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
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obj-$(CONFIG_RTC_DRV_PM8XXX) += rtc-pm8xxx.o
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obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o
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+obj-$(CONFIG_RTC_DRV_PT7C4338) += rtc-pt7c4338.o
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obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o
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obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o
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obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
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--- /dev/null
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+++ b/drivers/rtc/rtc-pt7c4338.c
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@@ -0,0 +1,216 @@
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+/*
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+ * Copyright 2010 Freescale Semiconductor, Inc.
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+ *
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+ * Author: Priyanka Jain <Priyanka.Jain@freescale.com>
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+ *
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+ * See file CREDITS for list of people who contributed to this
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+ * project.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of
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+ * the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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+ * MA 02111-1307 USA
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+ */
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+
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+/*
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+ * This file provides Date & Time support (no alarms) for PT7C4338 chip.
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+ *
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+ * This file is based on drivers/rtc/rtc-ds1307.c
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+ *
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+ * PT7C4338 chip is manufactured by Pericom Technology Inc.
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+ * It is a serial real-time clock which provides
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+ * 1)Low-power clock/calendar.
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+ * 2)Programmable square-wave output.
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+ * It has 56 bytes of nonvolatile RAM.
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/i2c.h>
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+#include <linux/rtc.h>
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+#include <linux/bcd.h>
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+
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+/* RTC register addresses */
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+#define PT7C4338_REG_SECONDS 0x00
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+#define PT7C4338_REG_MINUTES 0x01
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+#define PT7C4338_REG_HOURS 0x02
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+#define PT7C4338_REG_AMPM 0x02
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+#define PT7C4338_REG_DAY 0x03
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+#define PT7C4338_REG_DATE 0x04
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+#define PT7C4338_REG_MONTH 0x05
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+#define PT7C4338_REG_YEAR 0x06
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+#define PT7C4338_REG_CTRL_STAT 0x07
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+
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+/* RTC second register address bit */
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+#define PT7C4338_SEC_BIT_CH 0x80 /*Clock Halt (in Register 0)*/
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+
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+/* RTC control and status register bits */
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+#define PT7C4338_CTRL_STAT_BIT_RS0 0x1 /*Rate select 0*/
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+#define PT7C4338_CTRL_STAT_BIT_RS1 0x2 /*Rate select 1*/
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+#define PT7C4338_CTRL_STAT_BIT_SQWE 0x10 /*Square Wave Enable*/
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+#define PT7C4338_CTRL_STAT_BIT_OSF 0x20 /*Oscillator Stop Flag*/
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+#define PT7C4338_CTRL_STAT_BIT_OUT 0x80 /*Output Level Control*/
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+
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+static const struct i2c_device_id pt7c4338_id[] = {
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+ { "pt7c4338", 0 },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(i2c, pt7c4338_id);
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+
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+struct pt7c4338{
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+ struct i2c_client *client;
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+ struct rtc_device *rtc;
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+};
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+
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+static int pt7c4338_read_time(struct device *dev, struct rtc_time *time)
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+{
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+ struct i2c_client *client = to_i2c_client(dev);
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+ int ret;
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+ u8 buf[7];
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+ u8 year, month, day, hour, minute, second;
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+ u8 week, twelve_hr, am_pm;
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+
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+ ret = i2c_smbus_read_i2c_block_data(client,
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+ PT7C4338_REG_SECONDS, 7, buf);
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+ if (ret < 0)
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+ return ret;
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+ if (ret < 7)
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+ return -EIO;
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+
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+ second = buf[0];
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+ minute = buf[1];
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+ hour = buf[2];
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+ week = buf[3];
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+ day = buf[4];
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+ month = buf[5];
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+ year = buf[6];
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+
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+ /* Extract additional information for AM/PM */
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+ twelve_hr = hour & 0x40;
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+ am_pm = hour & 0x20;
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+
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+ /* Write to rtc_time structure */
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+ time->tm_sec = bcd2bin(second & 0x7f);
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+ time->tm_min = bcd2bin(minute & 0x7f);
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+ if (twelve_hr) {
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+ /* Convert to 24 hr */
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+ if (am_pm)
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+ time->tm_hour = bcd2bin(hour & 0x10) + 12;
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+ else
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+ time->tm_hour = bcd2bin(hour & 0xBF);
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+ } else {
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+ time->tm_hour = bcd2bin(hour);
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+ }
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+
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+ time->tm_wday = bcd2bin(week & 0x07) - 1;
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+ time->tm_mday = bcd2bin(day & 0x3f);
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+ time->tm_mon = bcd2bin(month & 0x1F) - 1;
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+ /* assume 20YY not 19YY */
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+ time->tm_year = bcd2bin(year) + 100;
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+
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+ return 0;
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+}
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+
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+static int pt7c4338_set_time(struct device *dev, struct rtc_time *time)
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+{
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+ struct i2c_client *client = to_i2c_client(dev);
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+ u8 buf[7];
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+
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+ /* Extract time from rtc_time and load into pt7c4338*/
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+ buf[0] = bin2bcd(time->tm_sec);
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+ buf[1] = bin2bcd(time->tm_min);
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+ buf[2] = bin2bcd(time->tm_hour);
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+ buf[3] = bin2bcd(time->tm_wday + 1); /* Day of the week */
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+ buf[4] = bin2bcd(time->tm_mday); /* Date */
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+ buf[5] = bin2bcd(time->tm_mon + 1);
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+
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+ /* assume 20YY not 19YY */
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+ if (time->tm_year >= 100)
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+ buf[6] = bin2bcd(time->tm_year - 100);
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+ else
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+ buf[6] = bin2bcd(time->tm_year);
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+
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+ return i2c_smbus_write_i2c_block_data(client,
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+ PT7C4338_REG_SECONDS, 7, buf);
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+}
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+
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+static const struct rtc_class_ops pt7c4338_rtc_ops = {
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+ .read_time = pt7c4338_read_time,
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+ .set_time = pt7c4338_set_time,
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+};
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+
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+static int pt7c4338_probe(struct i2c_client *client,
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+ const struct i2c_device_id *id)
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+{
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+ struct pt7c4338 *pt7c4338;
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+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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+ int ret;
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+
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+ pt7c4338 = kzalloc(sizeof(struct pt7c4338), GFP_KERNEL);
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+ if (!pt7c4338)
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+ return -ENOMEM;
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+
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+ pt7c4338->client = client;
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+ i2c_set_clientdata(client, pt7c4338);
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+ pt7c4338->rtc = rtc_device_register(client->name, &client->dev,
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+ &pt7c4338_rtc_ops, THIS_MODULE);
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+ if (IS_ERR(pt7c4338->rtc)) {
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+ ret = PTR_ERR(pt7c4338->rtc);
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+ dev_err(&client->dev, "unable to register the class device\n");
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+ goto out_free;
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+ }
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+
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+ return 0;
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+out_free:
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+ i2c_set_clientdata(client, NULL);
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+ kfree(pt7c4338);
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+ return ret;
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+}
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+
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+static int pt7c4338_remove(struct i2c_client *client)
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+{
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+ struct pt7c4338 *pt7c4338 = i2c_get_clientdata(client);
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+
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+ rtc_device_unregister(pt7c4338->rtc);
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+ i2c_set_clientdata(client, NULL);
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+ kfree(pt7c4338);
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+ return 0;
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+}
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+
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+static struct i2c_driver pt7c4338_driver = {
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+ .driver = {
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+ .name = "rtc-pt7c4338",
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = pt7c4338_probe,
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+ .remove = pt7c4338_remove,
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+ .id_table = pt7c4338_id,
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+};
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+
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+static int __init pt7c4338_init(void)
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+{
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+ return i2c_add_driver(&pt7c4338_driver);
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+}
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+
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+static void __exit pt7c4338_exit(void)
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+{
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+ i2c_del_driver(&pt7c4338_driver);
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+}
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+
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+module_init(pt7c4338_init);
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+module_exit(pt7c4338_exit);
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+
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+MODULE_AUTHOR("Priyanka Jain <Priyanka.Jain@freescale.com>");
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+MODULE_DESCRIPTION("pericom Technology Inc. PT7C4338 RTC Driver");
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+MODULE_LICENSE("GPL");
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