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path: root/drivers/hwmon/lm75.c
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-rw-r--r--drivers/hwmon/lm75.c238
1 files changed, 109 insertions, 129 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 8051cb2..8119821 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -26,19 +26,17 @@
*/
#include <common.h>
-
-#if !defined(CFG_EEPROM_PAGE_WRITE_ENABLE) || \
- (CFG_EEPROM_PAGE_WRITE_BITS < 1)
-# error "CFG_EEPROM_PAGE_WRITE_ENABLE must be defined and CFG_EEPROM_PAGE_WRITE_BITS must be greater than 1 to use CONFIG_DTT_LM75"
-#endif
-
#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
@@ -46,159 +44,141 @@
int dtt_read(int sensor, int reg)
{
- int dlen;
- uchar data[2];
+ 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);
+ /*
+ * 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); /* calculate address of lm75 */
-
- /*
- * 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];
+ /* 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); /* calculate address of lm75 */
-
- /*
- * 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;
+ 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() */
static int _dtt_init(int sensor)
{
- int val;
-
- /*
- * Setup TSET ( trip point ) register
- */
- val = ((CFG_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 = (((CFG_DTT_MAX_TEMP - CFG_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
- if (dtt_write(sensor, DTT_TEMP_HYST, val) != 0)
- return 1;
-
- /*
- * Setup configuraton register
- */
+ 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;
+ /* config = alert active low and disabled */
+ val = 0x60;
#else
- /* config = 6 sample integration, int mode, active low, and enable */
- val = 0x18;
+ /* config = 6 sample integration, int mode, active low, and enable */
+ val = 0x18;
#endif
- if (dtt_write(sensor, DTT_CONFIG, val) != 0)
- return 1;
+ if (dtt_write(sensor, DTT_CONFIG, val) != 0)
+ return 1;
- return 0;
+ return 0;
} /* _dtt_init() */
int dtt_init (void)
{
- int i;
- unsigned char sensors[] = CONFIG_DTT_SENSORS;
- const char *const header = "DTT: ";
+ int i;
+ unsigned char sensors[] = CONFIG_DTT_SENSORS;
+ const char *const header = "DTT: ";
+ int old_bus;
- for (i = 0; i < sizeof(sensors); i++) {
+ /* switch to correct I2C bus */
+ old_bus = I2C_GET_BUS();
+ I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
+
+ for (i = 0; i < sizeof(sensors); i++) {
if (_dtt_init(sensors[i]) != 0)
- printf("%s%d FAILED INIT\n", header, i+1);
+ printf("%s%d FAILED INIT\n", header, i+1);
else
- printf("%s%d is %i C\n", header, i+1,
- dtt_get_temp(sensors[i]));
- }
+ printf("%s%d is %i C\n", header, i+1,
+ dtt_get_temp(sensors[i]));
+ }
+ /* switch back to original I2C bus */
+ I2C_SET_BUS(old_bus);
- return (0);
+ return (0);
} /* dtt_init() */
int dtt_get_temp(int sensor)
{
- int const ret = dtt_read(sensor, DTT_READ_TEMP);
+ 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);
+ if (ret < 0) {
+ printf("DTT temperature read failed.\n");
+ return 0;
+ }
+ return (int)((int16_t) ret / 256);
} /* dtt_get_temp() */
generated by cgit v1.1 at 2024-11-18 19:04:59 +0000