1 files changed, 143 insertions, 0 deletions

diff --git a/qemu/roms/u-boot/drivers/hwmon/lm75.c b/qemu/roms/u-boot/drivers/hwmon/lm75.c
new file mode 100644
index 000000000..462f902da
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/hwmon/lm75.c
@@ -0,0 +1,143 @@
+/*
+ * (C) Copyright 2001
+ * Bill Hunter,  Wave 7 Optics, williamhunter@mediaone.net
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/*
+ * On Semiconductor's LM75 Temperature Sensor
+ */
+
+#include <common.h>
+#include <i2c.h>
+#include <dtt.h>
+
+/*
+ * Device code
+ */
+#if defined(CONFIG_SYS_I2C_DTT_ADDR)
+#define DTT_I2C_DEV_CODE CONFIG_SYS_I2C_DTT_ADDR
+#else
+#define DTT_I2C_DEV_CODE 0x48			/* ON Semi's LM75 device */
+#endif
+#define DTT_READ_TEMP		0x0
+#define DTT_CONFIG		0x1
+#define DTT_TEMP_HYST		0x2
+#define DTT_TEMP_SET		0x3
+
+int dtt_read(int sensor, int reg)
+{
+	int dlen;
+	uchar data[2];
+
+#ifdef CONFIG_DTT_AD7414
+	/*
+	 * On AD7414 the first value upon bootup is not read correctly.
+	 * This is most likely because of the 800ms update time of the
+	 * temp register in normal update mode. To get current values
+	 * each time we issue the "dtt" command including upon powerup
+	 * we switch into one-short mode.
+	 *
+	 * Issue one-shot mode command
+	 */
+	dtt_write(sensor, DTT_CONFIG, 0x64);
+#endif
+
+	/* Validate 'reg' param */
+	if((reg < 0) || (reg > 3))
+		return -1;
+
+	/* Calculate sensor address and register. */
+	sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
+
+	/* Prepare to handle 2 byte result. */
+	if ((reg == DTT_READ_TEMP) ||
+		(reg == DTT_TEMP_HYST) ||
+		(reg == DTT_TEMP_SET))
+			dlen = 2;
+	else
+		dlen = 1;
+
+	/* Now try to read the register. */
+	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
+		return -1;
+
+	/* Handle 2 byte result. */
+	if (dlen == 2)
+		return ((int)((short)data[1] + (((short)data[0]) << 8)));
+
+	return (int)data[0];
+} /* dtt_read() */
+
+
+int dtt_write(int sensor, int reg, int val)
+{
+	int dlen;
+	uchar data[2];
+
+	/* Validate 'reg' param */
+	if ((reg < 0) || (reg > 3))
+		return 1;
+
+	/* Calculate sensor address and register. */
+	sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
+
+	/* Handle 2 byte values. */
+	if ((reg == DTT_READ_TEMP) ||
+		(reg == DTT_TEMP_HYST) ||
+		(reg == DTT_TEMP_SET)) {
+			dlen = 2;
+		data[0] = (char)((val >> 8) & 0xff);	/* MSB first */
+		data[1] = (char)(val & 0xff);
+	} else {
+		dlen = 1;
+		data[0] = (char)(val & 0xff);
+	}
+
+	/* Write value to register. */
+	if (i2c_write(sensor, reg, 1, data, dlen) != 0)
+		return 1;
+
+	return 0;
+} /* dtt_write() */
+
+
+int dtt_init_one(int sensor)
+{
+	int val;
+
+	/* Setup TSET ( trip point ) register */
+	val = ((CONFIG_SYS_DTT_MAX_TEMP * 2) << 7) & 0xff80; /* trip */
+	if (dtt_write(sensor, DTT_TEMP_SET, val) != 0)
+		return 1;
+
+	/* Setup THYST ( untrip point ) register - Hysteresis */
+	val = (((CONFIG_SYS_DTT_MAX_TEMP - CONFIG_SYS_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
+	if (dtt_write(sensor, DTT_TEMP_HYST, val) != 0)
+		return 1;
+
+	/* Setup configuraton register */
+#ifdef CONFIG_DTT_AD7414
+	/* config = alert active low and disabled */
+	val = 0x60;
+#else
+	/* config = 6 sample integration, int mode, active low, and enable */
+	val = 0x18;
+#endif
+	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
+		return 1;
+
+	return 0;
+} /* dtt_init_one() */
+
+int dtt_get_temp(int 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 / 256);
+} /* dtt_get_temp() */