* (C) Copyright 2001
* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
/*
- * Dallas Semiconductor's DS1621 Digital Thermometer and Thermostat.
+ * Dallas Semiconductor's DS1621/1631 Digital Thermometer and Thermostat.
*/
#include <common.h>
-
-#ifdef CONFIG_DTT_DS1621
-#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_DS1621"
-#endif
#include <i2c.h>
#include <dtt.h>
/*
* Device code
*/
-#define DTT_I2C_DEV_CODE 0x48 /* Dallas Semi's DS1621 */
+#define DTT_I2C_DEV_CODE 0x48 /* Dallas Semi's DS1621 */
+#define DTT_READ_TEMP 0xAA
+#define DTT_READ_COUNTER 0xA8
+#define DTT_READ_SLOPE 0xA9
+#define DTT_WRITE_START_CONV 0xEE
+#define DTT_WRITE_STOP_CONV 0x22
+#define DTT_TEMP_HIGH 0xA1
+#define DTT_TEMP_LOW 0xA2
+#define DTT_CONFIG 0xAC
-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 ds1621*/
-
- /*
- * Prepare to handle 2 byte result.
- */
- if ((reg == DTT_READ_TEMP) ||
- (reg == DTT_TEMP_HIGH) || (reg == DTT_TEMP_LOW))
- 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() */
+/*
+ * Config register bits
+ */
+#define DTT_CONFIG_1SHOT 0x01
+#define DTT_CONFIG_POLARITY 0x02
+#define DTT_CONFIG_R0 0x04 /* ds1631 only */
+#define DTT_CONFIG_R1 0x08 /* ds1631 only */
+#define DTT_CONFIG_NVB 0x10
+#define DTT_CONFIG_TLF 0x20
+#define DTT_CONFIG_THF 0x40
+#define DTT_CONFIG_DONE 0x80
-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_HIGH) || (reg == DTT_TEMP_LOW)) {
- dlen = 2;
- data[0] = (char)((val >> 8) & 0xff); /* MSB first */
- data[1] = (char)(val & 0xff);
- }
- else if ((reg == DTT_WRITE_START_CONV) || (reg == DTT_WRITE_STOP_CONV)) {
- dlen = 0;
- data[0] = (char)0;
- data[1] = (char)0;
- }
- 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;
-} /* dtt_write() */
-
-
-static int _dtt_init(int sensor)
-{
- int val;
-
- /*
- * Setup High Temp.
- */
- val = ((CFG_DTT_MAX_TEMP * 2) << 7) & 0xff80;
- if (dtt_write(sensor, DTT_TEMP_HIGH, val) != 0)
- return 1;
- udelay(50000); /* Max 50ms */
-
- /*
- * Setup Low Temp - hysteresis.
- */
- val = (((CFG_DTT_MAX_TEMP - CFG_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
- if (dtt_write(sensor, DTT_TEMP_LOW, val) != 0)
- return 1;
- udelay(50000); /* Max 50ms */
-
- /*
- * Setup configuraton register
- *
- * Clear THF & TLF, Reserved = 1, Polarity = Active Low, One Shot = YES
- *
- * We run in polled mode, since there isn't any way to know if this
- * lousy device is ready to provide temperature readings on power up.
- */
- val = 0x9;
- if (dtt_write(sensor, DTT_CONFIG, val) != 0)
- return 1;
- udelay(50000); /* Max 50ms */
-
- return 0;
-} /* _dtt_init() */
-
-
-int dtt_init (void)
+int dtt_read(int sensor, int reg)
{
- int i;
- unsigned char sensors[] = CONFIG_DTT_SENSORS;
+ int dlen;
+ uchar data[2];
- for (i = 0; i < sizeof(sensors); i++) {
- if (_dtt_init(sensors[i]) != 0)
- printf("DTT%d: FAILED\n", i+1);
- else
- printf("DTT%d: %i C\n", i+1, dtt_get_temp(sensors[i]));
- }
+ /* Calculate sensor address and command */
+ sensor = DTT_I2C_DEV_CODE + (sensor & 0x07); /* Calculate addr of ds1621*/
- return (0);
-} /* dtt_init() */
+ /* Prepare to handle 2 byte result */
+ switch(reg) {
+ case DTT_READ_TEMP:
+ case DTT_TEMP_HIGH:
+ case DTT_TEMP_LOW:
+ dlen = 2;
+ break;
+ default:
+ dlen = 1;
+ }
+ /* Now try to read the register */
+ if (i2c_read(sensor, reg, 1, data, dlen) != 0)
+ return 1;
-int dtt_get_temp(int sensor)
-{
- int i;
+ /* Handle 2 byte result */
+ if (dlen == 2)
+ return (short)((data[0] << 8) | data[1]);
- /*
- * Start a conversion, may take up to 1 second.
- */
- dtt_write(sensor, DTT_WRITE_START_CONV, 0);
- for (i = 0; i <= 10; i++) {
- udelay(100000);
- if (dtt_read(sensor, DTT_CONFIG) & 0x80)
- break;
- }
+ return (int)data[0];
+}
- return (dtt_read(sensor, DTT_READ_TEMP) / 256);
-} /* dtt_get_temp() */
+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. */
+ switch(reg) {
+ case DTT_READ_TEMP:
+ case DTT_TEMP_HIGH:
+ case DTT_TEMP_LOW:
+ dlen = 2;
+ data[0] = (char)((val >> 8) & 0xff); /* MSB first */
+ data[1] = (char)(val & 0xff);
+ break;
+ case DTT_WRITE_START_CONV:
+ case DTT_WRITE_STOP_CONV:
+ dlen = 0;
+ data[0] = (char)0;
+ data[1] = (char)0;
+ break;
+ default:
+ dlen = 1;
+ data[0] = (char)(val & 0xff);
+ }
+
+ /* Write value to device */
+ if (i2c_write(sensor, reg, 1, data, dlen) != 0)
+ return 1;
+
+ /* Poll NV memory busy bit in case write was to register stored in EEPROM */
+ while(i2c_reg_read(sensor, DTT_CONFIG) & DTT_CONFIG_NVB)
+ ;
+
+ 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_HIGH, val) != 0)
+ return 1;
+
+ /* Setup Low Temp - hysteresis */
+ val = (((CONFIG_SYS_DTT_MAX_TEMP - CONFIG_SYS_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
+ if (dtt_write(sensor, DTT_TEMP_LOW, val) != 0)
+ return 1;
+
+ /*
+ * Setup configuraton register
+ *
+ * Clear THF & TLF, Reserved = 1, Polarity = Active Low, One Shot = YES
+ *
+ * We run in polled mode, since there isn't any way to know if this
+ * lousy device is ready to provide temperature readings on power up.
+ */
+ val = 0x9;
+ if (dtt_write(sensor, DTT_CONFIG, val) != 0)
+ return 1;
+
+ return 0;
+}
-#endif /* CONFIG_DTT_DS1621 */
+int dtt_get_temp(int sensor)
+{
+ int i;
+
+ /* Start a conversion, may take up to 1 second. */
+ dtt_write(sensor, DTT_WRITE_START_CONV, 0);
+ for (i = 0; i <= 10; i++) {
+ udelay(100000);
+ if (dtt_read(sensor, DTT_CONFIG) & DTT_CONFIG_DONE)
+ break;
+ }
+
+ return (dtt_read(sensor, DTT_READ_TEMP) / 256);
+}
projects / karo-tx-uboot.git / blobdiff