X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=drivers%2Frtc%2Frtc-ds1672.c;h=9be81fd4737c20c11cbcc4c2e466a41331c01434;hb=2edc322d420a4cec8dbc184a1220ecd7fa9f8ae6;hp=358695a416f32ec5f0da804e8c9efd5693e438ea;hpb=95d465fd750897ab32462a6702fbfe1b122cbbc0;p=powerpc.git

diff --git a/drivers/rtc/rtc-ds1672.c b/drivers/rtc/rtc-ds1672.c
index 358695a416..9be81fd473 100644
--- a/drivers/rtc/rtc-ds1672.c
+++ b/drivers/rtc/rtc-ds1672.c
@@ -1,6 +1,8 @@
 /*
  * An rtc/i2c driver for the Dallas DS1672
- * Copyright 2005 Alessandro Zummo
+ * 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
@@ -11,7 +13,7 @@
 #include <linux/i2c.h>
 #include <linux/rtc.h>
 
-#define DRV_VERSION "0.2"
+#define DRV_VERSION "0.3"
 
 /* Addresses to scan: none. This chip cannot be detected. */
 static unsigned short normal_i2c[] = { I2C_CLIENT_END };
@@ -25,6 +27,7 @@ I2C_CLIENT_INSMOD;
 #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);
@@ -53,8 +56,7 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 
 	dev_dbg(&client->dev,
 		"%s: raw read data - counters=%02x,%02x,%02x,%02x\n"
-		__FUNCTION__,
-		buf[0], buf[1], buf[2], buf[3]);
+		__FUNCTION__, buf[0], buf[1], buf[2], buf[3]);
 
 	time = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
 
@@ -62,8 +64,7 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_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,
+		__FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour,
 		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
 
 	return 0;
@@ -72,16 +73,17 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
 {
 	int xfer;
-	unsigned char buf[5];
+	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, 5);
-	if (xfer != 5) {
+	xfer = i2c_master_send(client, buf, 6);
+	if (xfer != 6) {
 		dev_err(&client->dev, "%s: send: %d\n", __FUNCTION__, xfer);
 		return -EIO;
 	}
@@ -120,6 +122,40 @@ 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 struct rtc_class_ops ds1672_rtc_ops = {
 	.read_time	= ds1672_rtc_read_time,
 	.set_time	= ds1672_rtc_set_time,
@@ -128,7 +164,6 @@ static struct rtc_class_ops ds1672_rtc_ops = {
 
 static int ds1672_attach(struct i2c_adapter *adapter)
 {
-	dev_dbg(&adapter->dev, "%s\n", __FUNCTION__);
 	return i2c_probe(adapter, &addr_data, ds1672_probe);
 }
 
@@ -137,8 +172,6 @@ static int ds1672_detach(struct i2c_client *client)
 	int err;
 	struct rtc_device *rtc = i2c_get_clientdata(client);
 
-	dev_dbg(&client->dev, "%s\n", __FUNCTION__);
-
  	if (rtc)
 		rtc_device_unregister(rtc);
 
@@ -162,6 +195,7 @@ static struct i2c_driver ds1672_driver = {
 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;
 
@@ -195,13 +229,23 @@ static int ds1672_probe(struct i2c_adapter *adapter, int address, int kind)
 
 	if (IS_ERR(rtc)) {
 		err = PTR_ERR(rtc);
-		dev_err(&client->dev,
-			"unable to register the class device\n");
 		goto exit_detach;
 	}
 
 	i2c_set_clientdata(client, rtc);
 
+	/* read control register */
+	err = ds1672_get_control(client, &control);
+	if (err)
+		goto exit_detach;
+
+	if (control & DS1672_REG_CONTROL_EOSC)
+		dev_warn(&client->dev, "Oscillator not enabled. "
+					"Set time to enable.\n");
+
+	/* Register sysfs hooks */
+	device_create_file(&client->dev, &dev_attr_control);
+
 	return 0;
 
 exit_detach: