summaryrefslogtreecommitdiff
path: root/drivers/misc/pmic_i2c.c
blob: e74c3727cdc1b93c6b7902d5e1ca648a816188c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
/*
 * Copyright (C) 2011 Samsung Electronics
 * Lukasz Majewski <l.majewski@samsung.com>
 *
 * (C) Copyright 2010
 * Stefano Babic, DENX Software Engineering, sbabic@denx.de
 *
 * (C) Copyright 2008-2009 Freescale Semiconductor, Inc.
 *
 * 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
 */

#include <common.h>
#include <linux/types.h>
#include <pmic.h>
#include <i2c.h>

int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
{
	unsigned char buf[4] = { 0 };

	if (check_reg(reg))
		return -1;

	switch (pmic_i2c_tx_num) {
	case 3:
		buf[0] = (val >> 16) & 0xff;
		buf[1] = (val >> 8) & 0xff;
		buf[2] = val & 0xff;
		break;
	case 2:
		buf[0] = (val >> 8) & 0xff;
		buf[1] = val & 0xff;
		break;
	case 1:
		buf[0] = val & 0xff;
		break;
	default:
		printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
		return -1;
	}

	if (i2c_write(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
		return -1;

	return 0;
}

int pmic_reg_read(struct pmic *p, u32 reg, u32 *val)
{
	unsigned char buf[4] = { 0 };
	u32 ret_val = 0;

	if (check_reg(reg))
		return -1;

	if (i2c_read(pmic_i2c_addr, reg, 1, buf, pmic_i2c_tx_num))
		return -1;

	switch (pmic_i2c_tx_num) {
	case 3:
		ret_val = buf[0] << 16 | buf[1] << 8 | buf[2];
		break;
	case 2:
		ret_val = buf[0] << 8 | buf[1];
		break;
	case 1:
		ret_val = buf[0];
		break;
	default:
		printf("%s: invalid tx_num: %d", __func__, pmic_i2c_tx_num);
		return -1;
	}
	memcpy(val, &ret_val, sizeof(ret_val));

	return 0;
}

int pmic_probe(struct pmic *p)
{
	I2C_SET_BUS(p->bus);
	debug("Bus: %d PMIC:%s probed!\n", p->bus, p->name);
	if (i2c_probe(pmic_i2c_addr)) {
		printf("Can't find PMIC:%s\n", p->name);
		return -1;
	}

	return 0;
}