Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / hwmon / lm81.c

diff --git a/qemu/roms/u-boot/drivers/hwmon/lm81.c b/qemu/roms/u-boot/drivers/hwmon/lm81.c
new file mode 100644 (file)
index 0000000..c1fc42a
--- /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() */