Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / hwmon / lm75.c

diff --git a/qemu/roms/u-boot/drivers/hwmon/lm75.c b/qemu/roms/u-boot/drivers/hwmon/lm75.c
new file mode 100644 (file)
index 0000000..462f902
--- /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() */