Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / hwmon / ds1775.c

diff --git a/qemu/roms/u-boot/drivers/hwmon/ds1775.c b/qemu/roms/u-boot/drivers/hwmon/ds1775.c
new file mode 100644 (file)
index 0000000..b95b130
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/hwmon/ds1775.c
@@ -0,0 +1,126 @@
+/*
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * Dallas Semiconductor's DS1775 Digital Thermometer and Thermostat
+ */
+
+#include <common.h>
+
+#include <i2c.h>
+#include <dtt.h>
+
+#define DTT_I2C_DEV_CODE       CONFIG_SYS_I2C_DTT_ADDR /* Dallas Semi's DS1775 device code */
+#define DTT_READ_TEMP          0x0
+#define DTT_CONFIG             0x1
+#define DTT_TEMP_HYST          0x2
+#define DTT_TEMP_OS            0x3
+
+int dtt_read(int sensor, int reg)
+{
+       int dlen;
+       uchar data[2];
+
+       /*
+        * Calculate sensor address and command
+        */
+       sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* Calculate addr of ds1775 */
+
+       /*
+        * Prepare to handle 2 byte result
+        */
+       if ((reg == DTT_READ_TEMP) ||
+           (reg == DTT_TEMP_OS) || (reg == DTT_TEMP_HYST))
+               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];
+}
+
+
+int dtt_write(int sensor, int reg, int val)
+{
+       int dlen;
+       uchar data[2];
+
+       /*
+        * Calculate sensor address and register
+        */
+       sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
+
+       /*
+        * Handle various data sizes
+        */
+       if ((reg == DTT_READ_TEMP) ||
+           (reg == DTT_TEMP_OS) || (reg == DTT_TEMP_HYST)) {
+               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 device
+        */
+       if (i2c_write(sensor, reg, 1, data, dlen) != 0)
+               return 1;
+
+       return 0;
+}
+
+
+int dtt_init_one(int sensor)
+{
+       int val;
+
+       /*
+        * Setup High Temp
+        */
+       val = ((CONFIG_SYS_DTT_MAX_TEMP * 2) << 7) & 0xff80;
+       if (dtt_write(sensor, DTT_TEMP_OS, val) != 0)
+               return 1;
+       udelay(50000);                  /* Max 50ms */
+
+       /*
+        * Setup Low Temp - 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;
+       udelay(50000);                  /* Max 50ms */
+
+       /*
+        * Setup configuraton register
+        *
+        * Fault Tolerance limits 4, Thermometer resolution bits is 9,
+        * Polarity = Active Low,continuous conversion mode, Thermostat
+        * mode is interrupt mode
+        */
+       val = 0xa;
+       if (dtt_write(sensor, DTT_CONFIG, val) != 0)
+               return 1;
+       udelay(50000);                  /* Max 50ms */
+
+       return 0;
+}
+
+int dtt_get_temp(int sensor)
+{
+       return (dtt_read(sensor, DTT_READ_TEMP) / 256);
+}