1 files changed, 146 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/hwmon/lm73.c b/qemu/roms/u-boot/drivers/hwmon/lm73.c
new file mode 100644
index 000000000..c15c7514d
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/hwmon/lm73.c
@@ -0,0 +1,146 @@
+/*
+ * (C) Copyright 2007-2008
+ * Larry Johnson, lrj@acm.org
+ *
+ * based on dtt/lm75.c which is ...
+ *
+ * (C) Copyright 2001
+ * Bill Hunter,  Wave 7 Optics, williamhunter@mediaone.net
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * National Semiconductor LM73 Temperature Sensor
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+/*
+ * Device code
+ */
+#define DTT_I2C_DEV_CODE 0x48	/* National Semi's LM73 device */
+#define DTT_READ_TEMP		0x0
+#define DTT_CONFIG		0x1
+#define DTT_TEMP_HIGH		0x2
+#define DTT_TEMP_LOW		0x3
+#define DTT_CONTROL		0x4
+#define DTT_ID			0x7
+
+int dtt_read(int const sensor, int const reg)
+{
+	int dlen;
+	uint8_t data[2];
+
+	/*
+	 * Validate 'reg' param and get register size.
+	 */
+	switch (reg) {
+	case DTT_CONFIG:
+	case DTT_CONTROL:
+		dlen = 1;
+		break;
+	case DTT_READ_TEMP:
+	case DTT_TEMP_HIGH:
+	case DTT_TEMP_LOW:
+	case DTT_ID:
+		dlen = 2;
+		break;
+	default:
+		return -1;
+	}
+	/*
+	 * Try to read the register at the calculated sensor address.
+	 */
+	if (0 !=
+	    i2c_read(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data, dlen))
+		return -1;
+	/*
+	 * Handle 2 byte result.
+	 */
+	if (2 == dlen)
+		return (int)((unsigned)data[0] << 8 | (unsigned)data[1]);
+
+	return (int)data[0];
+} /* dtt_read() */
+
+int dtt_write(int const sensor, int const reg, int const val)
+{
+	int dlen;
+	uint8_t data[2];
+
+	/*
+	 * Validate 'reg' param and handle register size
+	 */
+	switch (reg) {
+	case DTT_CONFIG:
+	case DTT_CONTROL:
+		dlen = 1;
+		data[0] = (uint8_t) val;
+		break;
+	case DTT_TEMP_HIGH:
+	case DTT_TEMP_LOW:
+		dlen = 2;
+		data[0] = (uint8_t) (val >> 8);	/* MSB first */
+		data[1] = (uint8_t) val;
+		break;
+	default:
+		return -1;
+	}
+	/*
+	 * Write value to register at the calculated sensor address.
+	 */
+	return 0 != i2c_write(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data,
+			      dlen);
+} /* dtt_write() */
+
+int dtt_init_one(int const sensor)
+{
+	int val;
+
+	/*
+	 * Validate the Identification register
+	 */
+	if (0x0190 != dtt_read(sensor, DTT_ID))
+		return -1;
+	/*
+	 * Setup THIGH (upper-limit) and TLOW (lower-limit) registers
+	 */
+	val = CONFIG_SYS_DTT_MAX_TEMP << 7;
+	if (dtt_write(sensor, DTT_TEMP_HIGH, val))
+		return -1;
+
+	val = CONFIG_SYS_DTT_MIN_TEMP << 7;
+	if (dtt_write(sensor, DTT_TEMP_LOW, val))
+		return -1;
+	/*
+	 * Setup configuraton register
+	 */
+	/* config = alert active low, disabled, and reset */
+	val = 0x64;
+	if (dtt_write(sensor, DTT_CONFIG, val))
+		return -1;
+	/*
+	 * Setup control/status register
+	 */
+	/* control = temp resolution 0.25C */
+	val = 0x00;
+	if (dtt_write(sensor, DTT_CONTROL, val))
+		return -1;
+
+	dtt_read(sensor, DTT_CONTROL);	/* clear temperature flags */
+	return 0;
+} /* dtt_init_one() */
+
+int dtt_get_temp(int const sensor)
+{
+	int const ret = dtt_read(sensor, DTT_READ_TEMP);
+
+	if (ret < 0) {
+		printf("DTT temperature read failed.\n");
+		return 0;
+	}
+	return (int)((int16_t) ret + 0x0040) >> 7;
+} /* dtt_get_temp() */