linux/3.3: add support for the Pericom PT7C4338 I2C RTC chip

Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31525 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 253 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.3/841-rtc_pt7c4338.patch b/target/linux/generic/patches-3.3/841-rtc_pt7c4338.patch
new file mode 100644
index 0000000000..ac41528613
--- /dev/null
+++ b/target/linux/generic/patches-3.3/841-rtc_pt7c4338.patch
@@ -0,0 +1,253 @@
+Index: linux-3.3/drivers/rtc/Kconfig
+===================================================================
+--- linux-3.3.orig/drivers/rtc/Kconfig	2012-03-20 07:52:18.838582040 +0100
++++ linux-3.3/drivers/rtc/Kconfig	2012-03-20 07:52:19.228579409 +0100
+@@ -379,6 +379,15 @@
+ 	  This driver can also be built as a module. If so, the module
+ 	  will be called rtc-rv3029c2.
+ 
++config RTC_DRV_PT7C4338
++	tristate "Pericom Technology Inc. PT7C4338 RTC"
++	help
++	  If you say yes here you get support for the Pericom Technology
++	  Inc. PT7C4338 RTC chip.
++
++	  This driver can also be built as a module. If so, the module
++	  will be called rtc-pt7c4338.
++
+ endif # I2C
+ 
+ comment "SPI RTC drivers"
+Index: linux-3.3/drivers/rtc/Makefile
+===================================================================
+--- linux-3.3.orig/drivers/rtc/Makefile	2012-03-20 07:52:18.838582040 +0100
++++ linux-3.3/drivers/rtc/Makefile	2012-03-20 07:52:19.228579409 +0100
+@@ -79,6 +79,7 @@
+ obj-$(CONFIG_RTC_DRV_PL031)	+= rtc-pl031.o
+ obj-$(CONFIG_RTC_DRV_PM8XXX)	+= rtc-pm8xxx.o
+ obj-$(CONFIG_RTC_DRV_PS3)	+= rtc-ps3.o
++obj-$(CONFIG_RTC_DRV_PT7C4338)	+= rtc-pt7c4338.o
+ obj-$(CONFIG_RTC_DRV_PUV3)	+= rtc-puv3.o
+ obj-$(CONFIG_RTC_DRV_PXA)	+= rtc-pxa.o
+ obj-$(CONFIG_RTC_DRV_R9701)	+= rtc-r9701.o
+Index: linux-3.3/drivers/rtc/rtc-pt7c4338.c
+===================================================================
+--- /dev/null	1970-01-01 00:00:00.000000000 +0000
++++ linux-3.3/drivers/rtc/rtc-pt7c4338.c	2012-03-20 07:52:19.228579409 +0100
+@@ -0,0 +1,216 @@
++/*
++ * Copyright 2010 Freescale Semiconductor, Inc.
++ *
++ * Author:	Priyanka Jain <Priyanka.Jain@freescale.com>
++ *
++ * See file CREDITS for list of people who contributed to this
++ * project.
++ *
++ * 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; either version 2 of
++ * the License, or (at your option) any later version.
++ *
++ * 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.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
++ * MA 02111-1307 USA
++ */
++
++/*
++ * This file provides Date & Time support (no alarms) for PT7C4338 chip.
++ *
++ * This file is based on drivers/rtc/rtc-ds1307.c
++ *
++ * PT7C4338 chip is manufactured by Pericom Technology Inc.
++ * It is a serial real-time clock which provides
++ * 1)Low-power clock/calendar.
++ * 2)Programmable square-wave output.
++ * It has 56 bytes of nonvolatile RAM.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/slab.h>
++#include <linux/i2c.h>
++#include <linux/rtc.h>
++#include <linux/bcd.h>
++
++/* RTC register addresses */
++#define PT7C4338_REG_SECONDS          0x00
++#define PT7C4338_REG_MINUTES          0x01
++#define PT7C4338_REG_HOURS            0x02
++#define PT7C4338_REG_AMPM             0x02
++#define PT7C4338_REG_DAY              0x03
++#define PT7C4338_REG_DATE             0x04
++#define PT7C4338_REG_MONTH            0x05
++#define PT7C4338_REG_YEAR             0x06
++#define PT7C4338_REG_CTRL_STAT        0x07
++
++/* RTC second register address bit */
++#define PT7C4338_SEC_BIT_CH           0x80	/*Clock Halt (in Register 0)*/
++
++/* RTC control and status register bits */
++#define PT7C4338_CTRL_STAT_BIT_RS0    0x1	/*Rate select 0*/
++#define PT7C4338_CTRL_STAT_BIT_RS1    0x2	/*Rate select 1*/
++#define PT7C4338_CTRL_STAT_BIT_SQWE   0x10	/*Square Wave Enable*/
++#define PT7C4338_CTRL_STAT_BIT_OSF    0x20	/*Oscillator Stop Flag*/
++#define PT7C4338_CTRL_STAT_BIT_OUT    0x80	/*Output Level Control*/
++
++static const struct i2c_device_id pt7c4338_id[] = {
++	{ "pt7c4338", 0 },
++	{ }
++};
++MODULE_DEVICE_TABLE(i2c, pt7c4338_id);
++
++struct pt7c4338{
++	struct i2c_client *client;
++	struct rtc_device *rtc;
++};
++
++static int pt7c4338_read_time(struct device *dev, struct rtc_time *time)
++{
++	struct i2c_client *client = to_i2c_client(dev);
++	int ret;
++	u8 buf[7];
++	u8 year, month, day, hour, minute, second;
++	u8 week, twelve_hr, am_pm;
++
++	ret = i2c_smbus_read_i2c_block_data(client,
++			PT7C4338_REG_SECONDS, 7, buf);
++	if (ret < 0)
++		return ret;
++	if (ret < 7)
++		return -EIO;
++
++	second = buf[0];
++	minute = buf[1];
++	hour = buf[2];
++	week = buf[3];
++	day = buf[4];
++	month = buf[5];
++	year = buf[6];
++
++	/* Extract additional information for AM/PM */
++	twelve_hr = hour & 0x40;
++	am_pm = hour & 0x20;
++
++	/* Write to rtc_time structure */
++	time->tm_sec = bcd2bin(second & 0x7f);
++	time->tm_min = bcd2bin(minute & 0x7f);
++	if (twelve_hr) {
++		/* Convert to 24 hr */
++		if (am_pm)
++			time->tm_hour = bcd2bin(hour & 0x10) + 12;
++		else
++			time->tm_hour = bcd2bin(hour & 0xBF);
++	} else {
++		time->tm_hour = bcd2bin(hour);
++	}
++
++	time->tm_wday = bcd2bin(week & 0x07) - 1;
++	time->tm_mday = bcd2bin(day & 0x3f);
++	time->tm_mon = bcd2bin(month & 0x1F) - 1;
++	/* assume 20YY not 19YY */
++	time->tm_year = bcd2bin(year) + 100;
++
++	return 0;
++}
++
++static int pt7c4338_set_time(struct device *dev, struct rtc_time *time)
++{
++	struct i2c_client *client = to_i2c_client(dev);
++	u8 buf[7];
++
++	/* Extract time from rtc_time and load into pt7c4338*/
++	buf[0] = bin2bcd(time->tm_sec);
++	buf[1] = bin2bcd(time->tm_min);
++	buf[2] = bin2bcd(time->tm_hour);
++	buf[3] = bin2bcd(time->tm_wday + 1); /* Day of the week */
++	buf[4] = bin2bcd(time->tm_mday); /* Date */
++	buf[5] = bin2bcd(time->tm_mon + 1);
++
++	/* assume 20YY not 19YY */
++	if (time->tm_year >= 100)
++		buf[6] = bin2bcd(time->tm_year - 100);
++	else
++		buf[6] = bin2bcd(time->tm_year);
++
++	return i2c_smbus_write_i2c_block_data(client,
++					PT7C4338_REG_SECONDS, 7, buf);
++}
++
++static const struct rtc_class_ops pt7c4338_rtc_ops = {
++	.read_time = pt7c4338_read_time,
++	.set_time = pt7c4338_set_time,
++};
++
++static int pt7c4338_probe(struct i2c_client *client,
++		const struct i2c_device_id *id)
++{
++	struct pt7c4338 *pt7c4338;
++	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
++	int ret;
++
++	pt7c4338 = kzalloc(sizeof(struct pt7c4338), GFP_KERNEL);
++	if (!pt7c4338)
++		return -ENOMEM;
++
++	pt7c4338->client = client;
++	i2c_set_clientdata(client, pt7c4338);
++	pt7c4338->rtc = rtc_device_register(client->name, &client->dev,
++					&pt7c4338_rtc_ops, THIS_MODULE);
++	if (IS_ERR(pt7c4338->rtc)) {
++		ret = PTR_ERR(pt7c4338->rtc);
++		dev_err(&client->dev, "unable to register the class device\n");
++		goto out_free;
++	}
++
++	return 0;
++out_free:
++	i2c_set_clientdata(client, NULL);
++	kfree(pt7c4338);
++	return ret;
++}
++
++static int __devexit pt7c4338_remove(struct i2c_client *client)
++{
++	struct pt7c4338 *pt7c4338 = i2c_get_clientdata(client);
++
++	rtc_device_unregister(pt7c4338->rtc);
++	i2c_set_clientdata(client, NULL);
++	kfree(pt7c4338);
++	return 0;
++}
++
++static struct i2c_driver pt7c4338_driver = {
++	.driver = {
++		.name = "rtc-pt7c4338",
++		.owner = THIS_MODULE,
++	},
++	.probe = pt7c4338_probe,
++	.remove = __devexit_p(pt7c4338_remove),
++	.id_table = pt7c4338_id,
++};
++
++static int __init pt7c4338_init(void)
++{
++	return i2c_add_driver(&pt7c4338_driver);
++}
++
++static void __exit pt7c4338_exit(void)
++{
++	i2c_del_driver(&pt7c4338_driver);
++}
++
++module_init(pt7c4338_init);
++module_exit(pt7c4338_exit);
++
++MODULE_AUTHOR("Priyanka Jain <Priyanka.Jain@freescale.com>");
++MODULE_DESCRIPTION("pericom Technology Inc. PT7C4338 RTC Driver");
++MODULE_LICENSE("GPL");