Merge with /home/hs/MAN/u-boot-dev

1 files changed, 148 insertions, 0 deletions

diff --git a/dtt/lm81.c b/dtt/lm81.c
new file mode 100644
index 0000000..c83a3cd
--- /dev/null
+++ b/dtt/lm81.c
@@ -0,0 +1,148 @@
+/*
+ * (C) Copyright 2006
+ * Heiko Schocher, DENX Software Enginnering <hs@denx.de>
+ *
+ * based on dtt/lm75.c which is ...
+ *
+ * (C) Copyright 2001
+ * Bill Hunter,  Wave 7 Optics, williamhunter@mediaone.net
+ *
+ * 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
+ */
+
+/*
+ * On Semiconductor's LM81 Temperature Sensor
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_DTT_LM81
+#if !defined(CFG_EEPROM_PAGE_WRITE_ENABLE) || \
+	(CFG_EEPROM_PAGE_WRITE_BITS < 1)
+# error "CFG_EEPROM_PAGE_WRITE_ENABLE must be defined and CFG_EEPROM_PAGE_WRITE_BITS must be greater than  1 to use CONFIG_DTT_LM81"
+#endif
+
+#include <i2c.h>
+#include <dtt.h>
+
+/*
+ * Device code
+ */
+#define DTT_I2C_DEV_CODE 0x2c			/* ON Semi's LM81 device */
+
+int dtt_read(int sensor, int reg)
+{
+    int dlen = 1;
+    uchar data[2];
+
+    /*
+     * Calculate sensor address and register.
+     */
+    sensor = DTT_I2C_DEV_CODE + (sensor & 0x03); /* calculate address of lm81 */
+
+    /*
+     * Now try to read the register.
+     */
+    if (i2c_read(sensor, reg, 1, data, dlen) != 0)
+	return -1;
+
+    return (int)data[0];
+} /* dtt_read() */
+
+
+int dtt_write(int sensor, int reg, int val)
+{
+    uchar data;
+
+    /*
+     * Calculate sensor address and register.
+     */
+    sensor = DTT_I2C_DEV_CODE + (sensor & 0x03); /* calculate address of lm81 */
+
+    data = (char)(val & 0xff);
+
+    /*
+     * Write value to register.
+     */
+    if (i2c_write(sensor, reg, 1, &data, 1) != 0)
+	return 1;
+
+    return 0;
+} /* dtt_write() */
+
+#define DTT_MANU	0x3e
+#define DTT_REV		0x3f
+#define DTT_CONFIG	0x40
+#define DTT_ADR		0x48
+
+static int _dtt_init(int sensor)
+{
+	int	man;
+	int	adr;
+	int	rev;
+
+	if (dtt_write (sensor, DTT_CONFIG, 0x01) < 0)
+		return 1;
+	/* The LM81 needs 400ms to get the correct values ... */
+	udelay (400000);
+	man = dtt_read (sensor, DTT_MANU);
+	if (man != 0x01)
+		return 1;
+	adr = dtt_read (sensor, DTT_ADR);
+	if (adr < 0)
+		return 1;
+	rev = dtt_read (sensor, DTT_REV);
+	if (adr < 0)
+		return 1;
+
+	printf ("DTT:   Found LM81@%x Rev: %d\n", adr, rev);
+	return 0;
+} /* _dtt_init() */
+
+
+int dtt_init (void)
+{
+    int i;
+    unsigned char sensors[] = CONFIG_DTT_SENSORS;
+    const char *const header = "DTT:   ";
+
+    for (i = 0; i < sizeof(sensors); i++) {
+	if (_dtt_init(sensors[i]) != 0)
+	    printf("%s%d FAILED INIT\n", header, i+1);
+	else
+	    printf("%s%d is %i C\n", header, i+1,
+		   dtt_get_temp(sensors[i]));
+    }
+
+    return (0);
+} /* dtt_init() */
+
+#define TEMP_FROM_REG(temp) \
+   ((temp)<256?((((temp)&0x1fe) >> 1) * 10)      + ((temp) & 1) * 5:  \
+               ((((temp)&0x1fe) >> 1) -255) * 10 - ((temp) & 1) * 5)  \
+
+int dtt_get_temp(int sensor)
+{
+	int val = dtt_read (sensor, DTT_READ_TEMP);
+	int tmpcnf = dtt_read (sensor, DTT_CONFIG_TEMP);
+
+	return (TEMP_FROM_REG((val << 1) + ((tmpcnf & 0x80) >> 7))) / 10;
+} /* dtt_get_temp() */
+
+#endif /* CONFIG_DTT_LM81 */