[people/ms/u-boot.git] / drivers / hwmon / lm63.c

/*
 * (C) Copyright 2007-2008
 * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
 * based on lm75.c by Bill Hunter
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * National LM63/LM64 Temperature Sensor
 * Main difference: LM 64 has -16 Kelvin temperature offset
 */

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

#define DTT_I2C_LM63_ADDR	0x4C	/* National LM63 device */

#define DTT_READ_TEMP_RMT_MSB	0x01
#define DTT_CONFIG		0x03
#define DTT_READ_TEMP_RMT_LSB	0x10
#define DTT_TACHLIM_LSB		0x48
#define DTT_TACHLIM_MSB		0x49
#define DTT_FAN_CONFIG		0x4A
#define DTT_PWM_FREQ		0x4D
#define DTT_PWM_LOOKUP_BASE	0x50

struct pwm_lookup_entry {
	u8 temp;
	u8 pwm;
};

/*
 * Device code
 */

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

	/*
	 * Calculate sensor address and register.
	 */
	if (!sensor)
		sensor = DTT_I2C_LM63_ADDR;	/* legacy config */

	dlen = 1;

	/*
	 * Now try to read the register.
	 */
	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
		return -1;

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

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

	/*
	 * Calculate sensor address and register.
	 */
	if (!sensor)
		sensor = DTT_I2C_LM63_ADDR;	/* legacy config */

	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 is_lm64(int sensor)
{
	return sensor && (sensor != DTT_I2C_LM63_ADDR);
}

int dtt_init_one(int sensor)
{
	int i;
	int val;

	struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;

	/*
	 * Set PWM Frequency to 2.5% resolution
	 */
	val = 20;
	if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
		return 1;

	/*
	 * Set Tachometer Limit
	 */
	val = CONFIG_DTT_TACH_LIMIT;
	if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
		return 1;
	if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
		return 1;

	/*
	 * Make sure PWM Lookup-Table is writeable
	 */
	if (dtt_write(sensor, DTT_FAN_CONFIG, 0x20) != 0)
		return 1;

	/*
	 * Setup PWM Lookup-Table
	 */
	for (i = 0; i < ARRAY_SIZE(pwm_lookup); i++) {
		int address = DTT_PWM_LOOKUP_BASE + 2 * i;
		val = pwm_lookup[i].temp;
		if (is_lm64(sensor))
			val -= 16;
		if (dtt_write(sensor, address, val) != 0)
			return 1;
		val = dtt_read(sensor, address);
		val = pwm_lookup[i].pwm;
		if (dtt_write(sensor, address + 1, val) != 0)
			return 1;
	}

	/*
	 * Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
	 */
	val = 0x02;
	if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
		return 1;

	/*
	 * Enable Tach input
	 */
	val = dtt_read(sensor, DTT_CONFIG) | 0x04;
	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
		return 1;

	return 0;
}

int dtt_get_temp(int sensor)
{
	s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
	    | (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));

	if (is_lm64(sensor))
		temp += 16 << 8;

	/* Ignore LSB for now, U-Boot only prints natural numbers */
	return temp >> 8;
}
Commit	Line	Data
1c6fe6ea DE	1	/*
	2	* (C) Copyright 2007-2008
	3	* Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
	4	* based on lm75.c by Bill Hunter
	5	*
1a459660	6	* SPDX-License-Identifier: GPL-2.0+
1c6fe6ea DE	7	*/
	8
	9	/*
31c1bdd9 DE	10	* National LM63/LM64 Temperature Sensor
31c1bdd9 DE	11	* Main difference: LM 64 has -16 Kelvin temperature offset
1c6fe6ea DE	12	*/
	13
	14	#include <common.h>
	15	#include <i2c.h>
	16	#include <dtt.h>
	17
31c1bdd9	18	#define DTT_I2C_LM63_ADDR 0x4C /* National LM63 device */
1c6fe6ea DE	19
	20	#define DTT_READ_TEMP_RMT_MSB 0x01
	21	#define DTT_CONFIG 0x03
	22	#define DTT_READ_TEMP_RMT_LSB 0x10
	23	#define DTT_TACHLIM_LSB 0x48
	24	#define DTT_TACHLIM_MSB 0x49
	25	#define DTT_FAN_CONFIG 0x4A
	26	#define DTT_PWM_FREQ 0x4D
	27	#define DTT_PWM_LOOKUP_BASE 0x50
	28
	29	struct pwm_lookup_entry {
	30	u8 temp;
	31	u8 pwm;
	32	};
	33
	34	/*
	35	* Device code
	36	*/
	37
	38	int dtt_read(int sensor, int reg)
	39	{
	40	int dlen;
	41	uchar data[2];
	42
	43	/*
	44	* Calculate sensor address and register.
	45	*/
31c1bdd9 DE	46	if (!sensor)
31c1bdd9 DE	47	sensor = DTT_I2C_LM63_ADDR; /* legacy config */
1c6fe6ea DE	48
	49	dlen = 1;
	50
	51	/*
	52	* Now try to read the register.
	53	*/
	54	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
	55	return -1;
	56
	57	return (int)data[0];
	58	} /* dtt_read() */
	59
	60	int dtt_write(int sensor, int reg, int val)
	61	{
	62	int dlen;
	63	uchar data[2];
	64
	65	/*
	66	* Calculate sensor address and register.
	67	*/
31c1bdd9 DE	68	if (!sensor)
31c1bdd9 DE	69	sensor = DTT_I2C_LM63_ADDR; /* legacy config */
1c6fe6ea DE	70
	71	dlen = 1;
	72	data[0] = (char)(val & 0xff);
	73
	74	/*
	75	* Write value to register.
	76	*/
	77	if (i2c_write(sensor, reg, 1, data, dlen) != 0)
	78	return 1;
	79
	80	return 0;
	81	} /* dtt_write() */
	82
31c1bdd9 DE	83	static int is_lm64(int sensor)
	84	{
	85	return sensor && (sensor != DTT_I2C_LM63_ADDR);
	86	}
	87
780f13a9	88	int dtt_init_one(int sensor)
1c6fe6ea DE	89	{
	90	int i;
	91	int val;
	92
	93	struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
	94
	95	/*
	96	* Set PWM Frequency to 2.5% resolution
	97	*/
	98	val = 20;
	99	if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
	100	return 1;
	101
	102	/*
	103	* Set Tachometer Limit
	104	*/
	105	val = CONFIG_DTT_TACH_LIMIT;
	106	if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
	107	return 1;
	108	if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
	109	return 1;
	110
31c1bdd9 DE	111	/*
	112	* Make sure PWM Lookup-Table is writeable
	113	*/
	114	if (dtt_write(sensor, DTT_FAN_CONFIG, 0x20) != 0)
	115	return 1;
	116
1c6fe6ea DE	117	/*
	118	* Setup PWM Lookup-Table
	119	*/
b98bfeb6	120	for (i = 0; i < ARRAY_SIZE(pwm_lookup); i++) {
1c6fe6ea DE	121	int address = DTT_PWM_LOOKUP_BASE + 2 * i;
1c6fe6ea DE	122	val = pwm_lookup[i].temp;
31c1bdd9 DE	123	if (is_lm64(sensor))
31c1bdd9 DE	124	val -= 16;
1c6fe6ea DE	125	if (dtt_write(sensor, address, val) != 0)
1c6fe6ea DE	126	return 1;
31c1bdd9	127	val = dtt_read(sensor, address);
1c6fe6ea DE	128	val = pwm_lookup[i].pwm;
	129	if (dtt_write(sensor, address + 1, val) != 0)
	130	return 1;
	131	}
	132
	133	/*
	134	* Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
	135	*/
	136	val = 0x02;
	137	if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
	138	return 1;
	139
	140	/*
	141	* Enable Tach input
	142	*/
	143	val = dtt_read(sensor, DTT_CONFIG) \| 0x04;
	144	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
	145	return 1;
	146
	147	return 0;
	148	}
	149
	150	int dtt_get_temp(int sensor)
	151	{
	152	s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
	153	\| (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
	154
31c1bdd9 DE	155	if (is_lm64(sensor))
	156	temp += 16 << 8;
	157
1c6fe6ea DE	158	/* Ignore LSB for now, U-Boot only prints natural numbers */
	159	return temp >> 8;
	160	}