[people/ms/u-boot.git] / drivers / hwmon / lm73.c

/*
 * (C) Copyright 2007-2008
 * Larry Johnson, lrj@acm.org
 *
 * based on dtt/lm75.c which is ...
 *
 * (C) Copyright 2001
 * Bill Hunter,  Wave 7 Optics, williamhunter@mediaone.net
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * National Semiconductor LM73 Temperature Sensor
 */

#include <common.h>
#include <i2c.h>
#include <dtt.h>

/*
 * Device code
 */
#define DTT_I2C_DEV_CODE 0x48	/* National Semi's LM73 device */
#define DTT_READ_TEMP		0x0
#define DTT_CONFIG		0x1
#define DTT_TEMP_HIGH		0x2
#define DTT_TEMP_LOW		0x3
#define DTT_CONTROL		0x4
#define DTT_ID			0x7

int dtt_read(int const sensor, int const reg)
{
	int dlen;
	uint8_t data[2];

	/*
	 * Validate 'reg' param and get register size.
	 */
	switch (reg) {
	case DTT_CONFIG:
	case DTT_CONTROL:
		dlen = 1;
		break;
	case DTT_READ_TEMP:
	case DTT_TEMP_HIGH:
	case DTT_TEMP_LOW:
	case DTT_ID:
		dlen = 2;
		break;
	default:
		return -1;
	}
	/*
	 * Try to read the register at the calculated sensor address.
	 */
	if (0 !=
	    i2c_read(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data, dlen))
		return -1;
	/*
	 * Handle 2 byte result.
	 */
	if (2 == dlen)
		return (int)((unsigned)data[0] << 8 | (unsigned)data[1]);

	return (int)data[0];
} /* dtt_read() */

int dtt_write(int const sensor, int const reg, int const val)
{
	int dlen;
	uint8_t data[2];

	/*
	 * Validate 'reg' param and handle register size
	 */
	switch (reg) {
	case DTT_CONFIG:
	case DTT_CONTROL:
		dlen = 1;
		data[0] = (uint8_t) val;
		break;
	case DTT_TEMP_HIGH:
	case DTT_TEMP_LOW:
		dlen = 2;
		data[0] = (uint8_t) (val >> 8);	/* MSB first */
		data[1] = (uint8_t) val;
		break;
	default:
		return -1;
	}
	/*
	 * Write value to register at the calculated sensor address.
	 */
	return 0 != i2c_write(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data,
			      dlen);
} /* dtt_write() */

int dtt_init_one(int const sensor)
{
	int val;

	/*
	 * Validate the Identification register
	 */
	if (0x0190 != dtt_read(sensor, DTT_ID))
		return -1;
	/*
	 * Setup THIGH (upper-limit) and TLOW (lower-limit) registers
	 */
	val = CONFIG_SYS_DTT_MAX_TEMP << 7;
	if (dtt_write(sensor, DTT_TEMP_HIGH, val))
		return -1;

	val = CONFIG_SYS_DTT_MIN_TEMP << 7;
	if (dtt_write(sensor, DTT_TEMP_LOW, val))
		return -1;
	/*
	 * Setup configuraton register
	 */
	/* config = alert active low, disabled, and reset */
	val = 0x64;
	if (dtt_write(sensor, DTT_CONFIG, val))
		return -1;
	/*
	 * Setup control/status register
	 */
	/* control = temp resolution 0.25C */
	val = 0x00;
	if (dtt_write(sensor, DTT_CONTROL, val))
		return -1;

	dtt_read(sensor, DTT_CONTROL);	/* clear temperature flags */
	return 0;
} /* dtt_init_one() */

int dtt_get_temp(int const 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 + 0x0040) >> 7;
} /* dtt_get_temp() */
Commit	Line	Data
9e2c3471	1	/*
7754f33c	2	* (C) Copyright 2007-2008
9e2c3471 LJ	3	* Larry Johnson, lrj@acm.org
	4	*
	5	* based on dtt/lm75.c which is ...
	6	*
	7	* (C) Copyright 2001
	8	* Bill Hunter, Wave 7 Optics, williamhunter@mediaone.net
	9	*
1a459660	10	* SPDX-License-Identifier: GPL-2.0+
9e2c3471 LJ	11	*/
	12
	13	/*
	14	* National Semiconductor LM73 Temperature Sensor
	15	*/
	16
	17	#include <common.h>
9e2c3471 LJ	18	#include <i2c.h>
	19	#include <dtt.h>
	20
	21	/*
	22	* Device code
	23	*/
	24	#define DTT_I2C_DEV_CODE 0x48 /* National Semi's LM73 device */
6ecbb45b MS	25	#define DTT_READ_TEMP 0x0
	26	#define DTT_CONFIG 0x1
	27	#define DTT_TEMP_HIGH 0x2
	28	#define DTT_TEMP_LOW 0x3
	29	#define DTT_CONTROL 0x4
	30	#define DTT_ID 0x7
9e2c3471	31
7754f33c	32	int dtt_read(int const sensor, int const reg)
9e2c3471 LJ	33	{
9e2c3471 LJ	34	int dlen;
7754f33c	35	uint8_t data[2];
9e2c3471 LJ	36
	37	/*
	38	* Validate 'reg' param and get register size.
	39	*/
	40	switch (reg) {
	41	case DTT_CONFIG:
	42	case DTT_CONTROL:
	43	dlen = 1;
	44	break;
	45	case DTT_READ_TEMP:
	46	case DTT_TEMP_HIGH:
	47	case DTT_TEMP_LOW:
	48	case DTT_ID:
	49	dlen = 2;
	50	break;
	51	default:
	52	return -1;
	53	}
	54	/*
7754f33c	55	* Try to read the register at the calculated sensor address.
9e2c3471	56	*/
7754f33c LJ	57	if (0 !=
7754f33c LJ	58	i2c_read(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data, dlen))
9e2c3471 LJ	59	return -1;
	60	/*
	61	* Handle 2 byte result.
	62	*/
	63	if (2 == dlen)
7754f33c	64	return (int)((unsigned)data[0] << 8 \| (unsigned)data[1]);
9e2c3471 LJ	65
	66	return (int)data[0];
	67	} /* dtt_read() */
	68
7754f33c	69	int dtt_write(int const sensor, int const reg, int const val)
9e2c3471 LJ	70	{
9e2c3471 LJ	71	int dlen;
7754f33c	72	uint8_t data[2];
9e2c3471 LJ	73
	74	/*
	75	* Validate 'reg' param and handle register size
	76	*/
	77	switch (reg) {
	78	case DTT_CONFIG:
	79	case DTT_CONTROL:
	80	dlen = 1;
7754f33c	81	data[0] = (uint8_t) val;
9e2c3471 LJ	82	break;
	83	case DTT_TEMP_HIGH:
	84	case DTT_TEMP_LOW:
	85	dlen = 2;
7754f33c LJ	86	data[0] = (uint8_t) (val >> 8); /* MSB first */
7754f33c LJ	87	data[1] = (uint8_t) val;
9e2c3471 LJ	88	break;
	89	default:
	90	return -1;
	91	}
	92	/*
7754f33c	93	* Write value to register at the calculated sensor address.
9e2c3471	94	*/
7754f33c LJ	95	return 0 != i2c_write(DTT_I2C_DEV_CODE + (sensor & 0x07), reg, 1, data,
7754f33c LJ	96	dlen);
9e2c3471 LJ	97	} /* dtt_write() */
9e2c3471 LJ	98
780f13a9	99	int dtt_init_one(int const sensor)
9e2c3471 LJ	100	{
	101	int val;
	102
	103	/*
	104	* Validate the Identification register
	105	*/
	106	if (0x0190 != dtt_read(sensor, DTT_ID))
7754f33c	107	return -1;
9e2c3471 LJ	108	/*
	109	* Setup THIGH (upper-limit) and TLOW (lower-limit) registers
	110	*/
6d0f6bcf	111	val = CONFIG_SYS_DTT_MAX_TEMP << 7;
9e2c3471	112	if (dtt_write(sensor, DTT_TEMP_HIGH, val))
7754f33c	113	return -1;
9e2c3471	114
6d0f6bcf	115	val = CONFIG_SYS_DTT_MIN_TEMP << 7;
9e2c3471	116	if (dtt_write(sensor, DTT_TEMP_LOW, val))
7754f33c	117	return -1;
9e2c3471 LJ	118	/*
	119	* Setup configuraton register
	120	*/
	121	/* config = alert active low, disabled, and reset */
	122	val = 0x64;
	123	if (dtt_write(sensor, DTT_CONFIG, val))
7754f33c	124	return -1;
9e2c3471 LJ	125	/*
	126	* Setup control/status register
	127	*/
	128	/* control = temp resolution 0.25C */
	129	val = 0x00;
	130	if (dtt_write(sensor, DTT_CONTROL, val))
7754f33c	131	return -1;
9e2c3471 LJ	132
	133	dtt_read(sensor, DTT_CONTROL); /* clear temperature flags */
	134	return 0;
780f13a9	135	} /* dtt_init_one() */
9e2c3471	136
7754f33c	137	int dtt_get_temp(int const sensor)
9e2c3471	138	{
7754f33c LJ	139	int const ret = dtt_read(sensor, DTT_READ_TEMP);
	140
	141	if (ret < 0) {
	142	printf("DTT temperature read failed.\n");
	143	return 0;
	144	}
	145	return (int)((int16_t) ret + 0x0040) >> 7;
9e2c3471	146	} /* dtt_get_temp() */