[people/ms/u-boot.git] / drivers / hwmon / lm75.c

/*
 * (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() */
Commit	Line	Data
c609719b WD	1	/*
	2	* (C) Copyright 2001
	3	* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
c609719b WD	6	*/
	7
	8	/*
	9	* On Semiconductor's LM75 Temperature Sensor
	10	*/
	11
	12	#include <common.h>
c609719b WD	13	#include <i2c.h>
	14	#include <dtt.h>
	15
c609719b WD	16	/*
	17	* Device code
	18	*/
6d0f6bcf JCPV	19	#if defined(CONFIG_SYS_I2C_DTT_ADDR)
6d0f6bcf JCPV	20	#define DTT_I2C_DEV_CODE CONFIG_SYS_I2C_DTT_ADDR
9ebbb54f	21	#else
c609719b	22	#define DTT_I2C_DEV_CODE 0x48 /* ON Semi's LM75 device */
9ebbb54f	23	#endif
6ecbb45b MS	24	#define DTT_READ_TEMP 0x0
	25	#define DTT_CONFIG 0x1
	26	#define DTT_TEMP_HYST 0x2
	27	#define DTT_TEMP_SET 0x3
c609719b WD	28
	29	int dtt_read(int sensor, int reg)
	30	{
12f16781 HS	31	int dlen;
12f16781 HS	32	uchar data[2];
c609719b	33
4d91d1df	34	#ifdef CONFIG_DTT_AD7414
12f16781 HS	35	/*
	36	* On AD7414 the first value upon bootup is not read correctly.
	37	* This is most likely because of the 800ms update time of the
	38	* temp register in normal update mode. To get current values
	39	* each time we issue the "dtt" command including upon powerup
	40	* we switch into one-short mode.
	41	*
	42	* Issue one-shot mode command
	43	*/
	44	dtt_write(sensor, DTT_CONFIG, 0x64);
4d91d1df SR	45	#endif
4d91d1df SR	46
12f16781 HS	47	/* Validate 'reg' param */
	48	if((reg < 0) \|\| (reg > 3))
	49	return -1;
	50
	51	/* Calculate sensor address and register. */
	52	sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
	53
	54	/* Prepare to handle 2 byte result. */
	55	if ((reg == DTT_READ_TEMP) \|\|
	56	(reg == DTT_TEMP_HYST) \|\|
	57	(reg == DTT_TEMP_SET))
	58	dlen = 2;
	59	else
	60	dlen = 1;
	61
	62	/* Now try to read the register. */
	63	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
	64	return -1;
	65
	66	/* Handle 2 byte result. */
	67	if (dlen == 2)
	68	return ((int)((short)data[1] + (((short)data[0]) << 8)));
	69
	70	return (int)data[0];
c609719b WD	71	} /* dtt_read() */
	72
	73
	74	int dtt_write(int sensor, int reg, int val)
	75	{
12f16781 HS	76	int dlen;
	77	uchar data[2];
	78
	79	/* Validate 'reg' param */
	80	if ((reg < 0) \|\| (reg > 3))
	81	return 1;
	82
	83	/* Calculate sensor address and register. */
	84	sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
	85
	86	/* Handle 2 byte values. */
	87	if ((reg == DTT_READ_TEMP) \|\|
	88	(reg == DTT_TEMP_HYST) \|\|
	89	(reg == DTT_TEMP_SET)) {
	90	dlen = 2;
	91	data[0] = (char)((val >> 8) & 0xff); /* MSB first */
	92	data[1] = (char)(val & 0xff);
	93	} else {
	94	dlen = 1;
	95	data[0] = (char)(val & 0xff);
	96	}
	97
	98	/* Write value to register. */
	99	if (i2c_write(sensor, reg, 1, data, dlen) != 0)
	100	return 1;
	101
	102	return 0;
c609719b WD	103	} /* dtt_write() */
	104
	105
780f13a9	106	int dtt_init_one(int sensor)
c609719b	107	{
12f16781 HS	108	int val;
	109
	110	/* Setup TSET ( trip point ) register */
6d0f6bcf	111	val = ((CONFIG_SYS_DTT_MAX_TEMP * 2) << 7) & 0xff80; /* trip */
12f16781 HS	112	if (dtt_write(sensor, DTT_TEMP_SET, val) != 0)
	113	return 1;
	114
	115	/* Setup THYST ( untrip point ) register - Hysteresis */
6d0f6bcf	116	val = (((CONFIG_SYS_DTT_MAX_TEMP - CONFIG_SYS_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
12f16781 HS	117	if (dtt_write(sensor, DTT_TEMP_HYST, val) != 0)
	118	return 1;
	119
	120	/* Setup configuraton register */
887e2ec9	121	#ifdef CONFIG_DTT_AD7414
12f16781 HS	122	/* config = alert active low and disabled */
12f16781 HS	123	val = 0x60;
887e2ec9	124	#else
12f16781 HS	125	/* config = 6 sample integration, int mode, active low, and enable */
12f16781 HS	126	val = 0x18;
887e2ec9	127	#endif
12f16781 HS	128	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
12f16781 HS	129	return 1;
c609719b	130
12f16781	131	return 0;
780f13a9	132	} /* dtt_init_one() */
c609719b WD	133
	134	int dtt_get_temp(int sensor)
	135	{
12f16781	136	int const ret = dtt_read(sensor, DTT_READ_TEMP);
d01b847c	137
12f16781 HS	138	if (ret < 0) {
	139	printf("DTT temperature read failed.\n");
	140	return 0;
	141	}
	142	return (int)((int16_t) ret / 256);
c609719b	143	} /* dtt_get_temp() */