1 files changed, 111 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/hwmon/lm81.c b/qemu/roms/u-boot/drivers/hwmon/lm81.c
new file mode 100644
index 000000000..c1fc42a83
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/hwmon/lm81.c
@@ -0,0 +1,111 @@
+/*
+ * (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
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * On Semiconductor's LM81 Temperature Sensor
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+/*
+ * Device code
+ */
+#define DTT_I2C_DEV_CODE 0x2c			/* ON Semi's LM81 device */
+#define DTT_READ_TEMP		0x27
+#define DTT_CONFIG_TEMP		0x4b
+#define DTT_TEMP_MAX		0x39
+#define DTT_TEMP_HYST		0x3a
+#define DTT_CONFIG		0x40
+
+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
+
+int dtt_init_one(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;
+
+	debug ("DTT:   Found LM81@%x Rev: %d\n", adr, rev);
+	return 0;
+} /* dtt_init_one() */
+
+
+#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() */