[J-u-boot.git] / drivers / power / axp152.c

/*
 * (C) Copyright 2012
 * Henrik Nordstrom <[email protected]>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <common.h>
#include <i2c.h>
#include <axp152.h>

enum axp152_reg {
	AXP152_CHIP_VERSION = 0x3,
	AXP152_DCDC2_VOLTAGE = 0x23,
	AXP152_DCDC3_VOLTAGE = 0x27,
	AXP152_DCDC4_VOLTAGE = 0x2B,
	AXP152_LDO2_VOLTAGE = 0x2A,
	AXP152_SHUTDOWN = 0x32,
};

#define AXP152_POWEROFF			(1 << 7)

static int axp152_write(enum axp152_reg reg, u8 val)
{
	return i2c_write(0x30, reg, 1, &val, 1);
}

static int axp152_read(enum axp152_reg reg, u8 *val)
{
	return i2c_read(0x30, reg, 1, val, 1);
}

static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
{
	if (mvolt < min)
		mvolt = min;
	else if (mvolt > max)
		mvolt = max;

	return (mvolt - min) / div;
}

int axp152_set_dcdc2(int mvolt)
{
	int rc;
	u8 current, target;

	target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);

	/* Do we really need to be this gentle? It has built-in voltage slope */
	while ((rc = axp152_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
	       current != target) {
		if (current < target)
			current++;
		else
			current--;
		rc = axp152_write(AXP152_DCDC2_VOLTAGE, current);
		if (rc)
			break;
	}
	return rc;
}

int axp152_set_dcdc3(int mvolt)
{
	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);

	return axp152_write(AXP152_DCDC3_VOLTAGE, target);
}

int axp152_set_dcdc4(int mvolt)
{
	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);

	return axp152_write(AXP152_DCDC4_VOLTAGE, target);
}

int axp152_set_ldo2(int mvolt)
{
	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);

	return axp152_write(AXP152_LDO2_VOLTAGE, target);
}

int axp152_init(void)
{
	u8 ver;
	int rc;

	rc = axp152_read(AXP152_CHIP_VERSION, &ver);
	if (rc)
		return rc;

	if (ver != 0x05)
		return -1;

	return 0;
}
Commit	Line	Data
24289208 HG	1	/*
	2	* (C) Copyright 2012
	3	* Henrik Nordstrom <[email protected]>
	4	*
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*/
	7	#include <common.h>
	8	#include <i2c.h>
	9	#include <axp152.h>
	10
	11	enum axp152_reg {
	12	AXP152_CHIP_VERSION = 0x3,
	13	AXP152_DCDC2_VOLTAGE = 0x23,
	14	AXP152_DCDC3_VOLTAGE = 0x27,
	15	AXP152_DCDC4_VOLTAGE = 0x2B,
	16	AXP152_LDO2_VOLTAGE = 0x2A,
	17	AXP152_SHUTDOWN = 0x32,
	18	};
	19
	20	#define AXP152_POWEROFF (1 << 7)
	21
	22	static int axp152_write(enum axp152_reg reg, u8 val)
	23	{
	24	return i2c_write(0x30, reg, 1, &val, 1);
	25	}
	26
	27	static int axp152_read(enum axp152_reg reg, u8 *val)
	28	{
	29	return i2c_read(0x30, reg, 1, val, 1);
	30	}
	31
	32	static u8 axp152_mvolt_to_target(int mvolt, int min, int max, int div)
	33	{
	34	if (mvolt < min)
	35	mvolt = min;
	36	else if (mvolt > max)
	37	mvolt = max;
	38
	39	return (mvolt - min) / div;
	40	}
	41
	42	int axp152_set_dcdc2(int mvolt)
	43	{
	44	int rc;
	45	u8 current, target;
	46
	47	target = axp152_mvolt_to_target(mvolt, 700, 2275, 25);
	48
	49	/* Do we really need to be this gentle? It has built-in voltage slope */
	50	while ((rc = axp152_read(AXP152_DCDC2_VOLTAGE, &current)) == 0 &&
	51	current != target) {
	52	if (current < target)
	53	current++;
	54	else
	55	current--;
	56	rc = axp152_write(AXP152_DCDC2_VOLTAGE, current);
	57	if (rc)
	58	break;
	59	}
	60	return rc;
	61	}
	62
	63	int axp152_set_dcdc3(int mvolt)
	64	{
65	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
66
67	return axp152_write(AXP152_DCDC3_VOLTAGE, target);
68	}
69
70	int axp152_set_dcdc4(int mvolt)
71	{
72	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 25);
73
74	return axp152_write(AXP152_DCDC4_VOLTAGE, target);
75	}
76
77	int axp152_set_ldo2(int mvolt)
78	{
79	u8 target = axp152_mvolt_to_target(mvolt, 700, 3500, 100);
80
81	return axp152_write(AXP152_LDO2_VOLTAGE, target);
82	}
83
84	int axp152_init(void)
85	{
86	u8 ver;
87	int rc;
88
89	rc = axp152_read(AXP152_CHIP_VERSION, &ver);
90	if (rc)
91	return rc;
92
93	if (ver != 0x05)
94	return -1;
95
96	return 0;
97	}