drivers/rtc/rtc-ds1672.c - kernel/msm - Gitiles

 /*
  * An rtc/i2c driver for the Dallas DS1672
  * Copyright 2005-06 Tower Technologies
  *
  * Author: Alessandro Zummo <a.zummo@towertech.it>
  *
  * 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/rtc.h>

 #define DRV_VERSION "0.3"

 /* Addresses to scan: none. This chip cannot be detected. */
 static unsigned short normal_i2c[] = { I2C_CLIENT_END };

 /* Insmod parameters */
 I2C_CLIENT_INSMOD;

 /* Registers */

 #define DS1672_REG_CNT_BASE	0
 #define DS1672_REG_CONTROL	4
 #define DS1672_REG_TRICKLE	5

 #define DS1672_REG_CONTROL_EOSC	0x80

 /* Prototypes */
 static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind);

 /*
  * In the routines that deal directly with the ds1672 hardware, we use
  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
  * Epoch is initialized as 2000. Time is set to UTC.
  */
 static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 {
 	unsigned long time;
 	unsigned char addr = DS1672_REG_CNT_BASE;
 	unsigned char buf[4];

 	struct i2c_msg msgs[] = {
 		{ client->addr, 0, 1, &addr },		/* setup read ptr */
 		{ client->addr, I2C_M_RD, 4, buf },	/* read date */
 	};

 	/* read date registers */
 	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
 		dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
 		return -EIO;
 	}

 	dev_dbg(&client->dev,
 		"%s: raw read data - counters=%02x,%02x,%02x,%02x\n",
 		__FUNCTION__, buf[0], buf[1], buf[2], buf[3]);

 	time = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];

 	rtc_time_to_tm(time, tm);

 	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
 		"mday=%d, mon=%d, year=%d, wday=%d\n",
 		__FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour,
 		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

 	return 0;
 }

 static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
 {
 	int xfer;
 	unsigned char buf[6];

 	buf[0] = DS1672_REG_CNT_BASE;
 	buf[1] = secs & 0x000000FF;
 	buf[2] = (secs & 0x0000FF00) >> 8;
 	buf[3] = (secs & 0x00FF0000) >> 16;
 	buf[4] = (secs & 0xFF000000) >> 24;
 	buf[5] = 0;	/* set control reg to enable counting */

 	xfer = i2c_master_send(client, buf, 6);
 	if (xfer != 6) {
 		dev_err(&client->dev, "%s: send: %d\n", __FUNCTION__, xfer);
 		return -EIO;
 	}

 	return 0;
 }

 static int ds1672_set_datetime(struct i2c_client *client, struct rtc_time *tm)
 {
 	unsigned long secs;

 	dev_dbg(&client->dev,
 		"%s: secs=%d, mins=%d, hours=%d, "
 		"mday=%d, mon=%d, year=%d, wday=%d\n",
 		__FUNCTION__,
 		tm->tm_sec, tm->tm_min, tm->tm_hour,
 		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

 	rtc_tm_to_time(tm, &secs);

 	return ds1672_set_mmss(client, secs);
 }

 static int ds1672_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
 	return ds1672_get_datetime(to_i2c_client(dev), tm);
 }

 static int ds1672_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
 	return ds1672_set_datetime(to_i2c_client(dev), tm);
 }

 static int ds1672_rtc_set_mmss(struct device *dev, unsigned long secs)
 {
 	return ds1672_set_mmss(to_i2c_client(dev), secs);
 }

 static int ds1672_get_control(struct i2c_client *client, u8 *status)
 {
 	unsigned char addr = DS1672_REG_CONTROL;

 	struct i2c_msg msgs[] = {
 		{ client->addr, 0, 1, &addr },		/* setup read ptr */
 		{ client->addr, I2C_M_RD, 1, status },	/* read control */
 	};

 	/* read control register */
 	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
 		dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
 		return -EIO;
 	}

 	return 0;
 }

 /* following are the sysfs callback functions */
 static ssize_t show_control(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	u8 control;
 	int err;

 	err = ds1672_get_control(client, &control);
 	if (err)
 		return err;

 	return sprintf(buf, "%s\n", (control & DS1672_REG_CONTROL_EOSC)
 					? "disabled" : "enabled");
 }
 static DEVICE_ATTR(control, S_IRUGO, show_control, NULL);

 static const struct rtc_class_ops ds1672_rtc_ops = {
 	.read_time	= ds1672_rtc_read_time,
 	.set_time	= ds1672_rtc_set_time,
 	.set_mmss	= ds1672_rtc_set_mmss,
 };

 static int ds1672_attach(struct i2c_adapter *adapter)
 {
 	return i2c_probe(adapter, &addr_data, ds1672_probe);
 }

 static int ds1672_detach(struct i2c_client *client)
 {
 	int err;
 	struct rtc_device *rtc = i2c_get_clientdata(client);

  	if (rtc)
 		rtc_device_unregister(rtc);

 	if ((err = i2c_detach_client(client)))
 		return err;

 	kfree(client);

 	return 0;
 }

 static struct i2c_driver ds1672_driver = {
 	.driver		= {
 		.name	= "ds1672",
 	},
 	.id		= I2C_DRIVERID_DS1672,
 	.attach_adapter = &ds1672_attach,
 	.detach_client	= &ds1672_detach,
 };

 static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind)
 {
 	int err = 0;
 	u8 control;
 	struct i2c_client *client;
 	struct rtc_device *rtc;

 	dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);

 	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
 		err = -ENODEV;
 		goto exit;
 	}

 	if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
 		err = -ENOMEM;
 		goto exit;
 	}

 	/* I2C client */
 	client->addr = address;
 	client->driver = &ds1672_driver;
 	client->adapter	= adapter;

 	strlcpy(client->name, ds1672_driver.driver.name, I2C_NAME_SIZE);

 	/* Inform the i2c layer */
 	if ((err = i2c_attach_client(client)))
 		goto exit_kfree;

 	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");

 	rtc = rtc_device_register(ds1672_driver.driver.name, &client->dev,
 				&ds1672_rtc_ops, THIS_MODULE);

 	if (IS_ERR(rtc)) {
 		err = PTR_ERR(rtc);
 		goto exit_detach;
 	}

 	i2c_set_clientdata(client, rtc);

 	/* read control register */
 	err = ds1672_get_control(client, &control);
 	if (err)
 		goto exit_devreg;

 	if (control & DS1672_REG_CONTROL_EOSC)
 		dev_warn(&client->dev, "Oscillator not enabled. "
 					"Set time to enable.\n");

 	/* Register sysfs hooks */
 	err = device_create_file(&client->dev, &dev_attr_control);
 	if (err)
 		goto exit_devreg;

 	return 0;

 exit_devreg:
 	rtc_device_unregister(rtc);

 exit_detach:
 	i2c_detach_client(client);

 exit_kfree:
 	kfree(client);

 exit:
 	return err;
 }

 static int __init ds1672_init(void)
 {
 	return i2c_add_driver(&ds1672_driver);
 }

 static void __exit ds1672_exit(void)
 {
 	i2c_del_driver(&ds1672_driver);
 }

 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
 MODULE_DESCRIPTION("Dallas/Maxim DS1672 timekeeper driver");
 MODULE_LICENSE("GPL");
 MODULE_VERSION(DRV_VERSION);

 module_init(ds1672_init);
 module_exit(ds1672_exit);
	/*
	* An rtc/i2c driver for the Dallas DS1672
	* Copyright 2005-06 Tower Technologies
	*
	* Author: Alessandro Zummo <a.zummo@towertech.it>
	*
	* 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/rtc.h>

	#define DRV_VERSION "0.3"

	/* Addresses to scan: none. This chip cannot be detected. */
	static unsigned short normal_i2c[] = { I2C_CLIENT_END };

	/* Insmod parameters */
	I2C_CLIENT_INSMOD;

	/* Registers */

	#define DS1672_REG_CNT_BASE 0
	#define DS1672_REG_CONTROL 4
	#define DS1672_REG_TRICKLE 5

	#define DS1672_REG_CONTROL_EOSC 0x80

	/* Prototypes */
	static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind);

	/*
	* In the routines that deal directly with the ds1672 hardware, we use
	* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
	* Epoch is initialized as 2000. Time is set to UTC.
	*/
	static int ds1672_get_datetime(struct i2c_client client, struct rtc_time tm)
	{
	unsigned long time;
	unsigned char addr = DS1672_REG_CNT_BASE;
	unsigned char buf[4];

	struct i2c_msg msgs[] = {
	{ client->addr, 0, 1, &addr }, /* setup read ptr */
	{ client->addr, I2C_M_RD, 4, buf }, /* read date */
	};

	/* read date registers */
	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
	dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
	return -EIO;
	}

	dev_dbg(&client->dev,
	"%s: raw read data - counters=%02x,%02x,%02x,%02x\n",
	__FUNCTION__, buf[0], buf[1], buf[2], buf[3]);

	time = (buf[3] << 24) \| (buf[2] << 16) \| (buf[1] << 8) \| buf[0];

	rtc_time_to_tm(time, tm);

	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
	"mday=%d, mon=%d, year=%d, wday=%d\n",
	__FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour,
	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

	return 0;
	}

	static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
	{
	int xfer;
	unsigned char buf[6];

	buf[0] = DS1672_REG_CNT_BASE;
	buf[1] = secs & 0x000000FF;
	buf[2] = (secs & 0x0000FF00) >> 8;
	buf[3] = (secs & 0x00FF0000) >> 16;
	buf[4] = (secs & 0xFF000000) >> 24;
	buf[5] = 0; /* set control reg to enable counting */

	xfer = i2c_master_send(client, buf, 6);
	if (xfer != 6) {
	dev_err(&client->dev, "%s: send: %d\n", __FUNCTION__, xfer);
	return -EIO;
	}

	return 0;
	}

	static int ds1672_set_datetime(struct i2c_client client, struct rtc_time tm)
	{
	unsigned long secs;

	dev_dbg(&client->dev,
	"%s: secs=%d, mins=%d, hours=%d, "
	"mday=%d, mon=%d, year=%d, wday=%d\n",
	__FUNCTION__,
	tm->tm_sec, tm->tm_min, tm->tm_hour,
	tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

	rtc_tm_to_time(tm, &secs);

	return ds1672_set_mmss(client, secs);
	}

	static int ds1672_rtc_read_time(struct device dev, struct rtc_time tm)
	{
	return ds1672_get_datetime(to_i2c_client(dev), tm);
	}

	static int ds1672_rtc_set_time(struct device dev, struct rtc_time tm)
	{
	return ds1672_set_datetime(to_i2c_client(dev), tm);
	}

	static int ds1672_rtc_set_mmss(struct device *dev, unsigned long secs)
	{
	return ds1672_set_mmss(to_i2c_client(dev), secs);
	}

	static int ds1672_get_control(struct i2c_client client, u8 status)
	{
	unsigned char addr = DS1672_REG_CONTROL;

	struct i2c_msg msgs[] = {
	{ client->addr, 0, 1, &addr }, /* setup read ptr */
	{ client->addr, I2C_M_RD, 1, status }, /* read control */
	};

	/* read control register */
	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
	dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
	return -EIO;
	}

	return 0;
	}

	/* following are the sysfs callback functions */
	static ssize_t show_control(struct device dev, struct device_attribute attr, char *buf)
	{
	struct i2c_client *client = to_i2c_client(dev);
	u8 control;
	int err;

	err = ds1672_get_control(client, &control);
	if (err)
	return err;

	return sprintf(buf, "%s\n", (control & DS1672_REG_CONTROL_EOSC)
	? "disabled" : "enabled");
	}
	static DEVICE_ATTR(control, S_IRUGO, show_control, NULL);

	static const struct rtc_class_ops ds1672_rtc_ops = {
	.read_time = ds1672_rtc_read_time,
	.set_time = ds1672_rtc_set_time,
	.set_mmss = ds1672_rtc_set_mmss,
	};

	static int ds1672_attach(struct i2c_adapter *adapter)
	{
	return i2c_probe(adapter, &addr_data, ds1672_probe);
	}

	static int ds1672_detach(struct i2c_client *client)
	{
	int err;
	struct rtc_device *rtc = i2c_get_clientdata(client);

	if (rtc)
	rtc_device_unregister(rtc);

	if ((err = i2c_detach_client(client)))
	return err;

	kfree(client);

	return 0;
	}

	static struct i2c_driver ds1672_driver = {
	.driver = {
	.name = "ds1672",
	},
	.id = I2C_DRIVERID_DS1672,
	.attach_adapter = &ds1672_attach,
	.detach_client = &ds1672_detach,
	};

	static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind)
	{
	int err = 0;
	u8 control;
	struct i2c_client *client;
	struct rtc_device *rtc;

	dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);

	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
	err = -ENODEV;
	goto exit;
	}

	if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) {
	err = -ENOMEM;
	goto exit;
	}

	/* I2C client */
	client->addr = address;
	client->driver = &ds1672_driver;
	client->adapter = adapter;

	strlcpy(client->name, ds1672_driver.driver.name, I2C_NAME_SIZE);

	/* Inform the i2c layer */
	if ((err = i2c_attach_client(client)))
	goto exit_kfree;

	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");

	rtc = rtc_device_register(ds1672_driver.driver.name, &client->dev,
	&ds1672_rtc_ops, THIS_MODULE);

	if (IS_ERR(rtc)) {
	err = PTR_ERR(rtc);
	goto exit_detach;
	}

	i2c_set_clientdata(client, rtc);

	/* read control register */
	err = ds1672_get_control(client, &control);
	if (err)
	goto exit_devreg;

	if (control & DS1672_REG_CONTROL_EOSC)
	dev_warn(&client->dev, "Oscillator not enabled. "
	"Set time to enable.\n");

	/* Register sysfs hooks */
	err = device_create_file(&client->dev, &dev_attr_control);
	if (err)
	goto exit_devreg;

	return 0;

	exit_devreg:
	rtc_device_unregister(rtc);

	exit_detach:
	i2c_detach_client(client);

	exit_kfree:
	kfree(client);

	exit:
	return err;
	}

	static int __init ds1672_init(void)
	{
	return i2c_add_driver(&ds1672_driver);
	}

	static void __exit ds1672_exit(void)
	{
	i2c_del_driver(&ds1672_driver);
	}

	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	MODULE_DESCRIPTION("Dallas/Maxim DS1672 timekeeper driver");
	MODULE_LICENSE("GPL");
	MODULE_VERSION(DRV_VERSION);

	module_init(ds1672_init);
	module_exit(ds1672_exit);