1 /*
2  *  Copyright (C) 2012 Samsung Electronics
3  *  Lukasz Majewski <l.majewski@samsung.com>
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 
24 #include <common.h>
25 #include <power/pmic.h>
26 #include <power/max8997_pmic.h>
27 #include <i2c.h>
28 #include <errno.h>
29 
30 unsigned char max8997_reg_ldo(int uV)
31 {
32 	unsigned char ret;
33 	if (uV <= 800000)
34 		return 0;
35 	if (uV >= 3950000)
36 		return MAX8997_LDO_MAX_VAL;
37 	ret = (uV - 800000) / 50000;
38 	if (ret > MAX8997_LDO_MAX_VAL) {
39 		printf("MAX8997 LDO SETTING ERROR (%duV) -> %u\n", uV, ret);
40 		ret = MAX8997_LDO_MAX_VAL;
41 	}
42 
43 	return ret;
44 }
45 
46 static int pmic_charger_state(struct pmic *p, int state, int current)
47 {
48 	unsigned char fc;
49 	u32 val = 0;
50 
51 	if (pmic_probe(p))
52 		return -1;
53 
54 	if (state == CHARGER_DISABLE) {
55 		puts("Disable the charger.\n");
56 		pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
57 		val &= ~(MBCHOSTEN | VCHGR_FC);
58 		pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
59 
60 		return -1;
61 	}
62 
63 	if (current < CHARGER_MIN_CURRENT || current > CHARGER_MAX_CURRENT) {
64 		printf("%s: Wrong charge current: %d [mA]\n",
65 		       __func__, current);
66 		return -1;
67 	}
68 
69 	fc = (current - CHARGER_MIN_CURRENT) / CHARGER_CURRENT_RESOLUTION;
70 	fc = fc & 0xf; /* up to 950 mA */
71 
72 	printf("Enable the charger @ %d [mA]\n", fc * CHARGER_CURRENT_RESOLUTION
73 	       + CHARGER_MIN_CURRENT);
74 
75 	val = fc | MBCICHFCSET;
76 	pmic_reg_write(p, MAX8997_REG_MBCCTRL4, val);
77 
78 	pmic_reg_read(p, MAX8997_REG_MBCCTRL2, &val);
79 	val = MBCHOSTEN | VCHGR_FC; /* enable charger & fast charge */
80 	pmic_reg_write(p, MAX8997_REG_MBCCTRL2, val);
81 
82 	return 0;
83 }
84 
85 static int pmic_charger_bat_present(struct pmic *p)
86 {
87 	u32 val;
88 
89 	if (pmic_probe(p))
90 		return -1;
91 
92 	pmic_reg_read(p, MAX8997_REG_STATUS4, &val);
93 
94 	return !(val & DETBAT);
95 }
96 
97 static struct power_chrg power_chrg_pmic_ops = {
98 	.chrg_bat_present = pmic_charger_bat_present,
99 	.chrg_state = pmic_charger_state,
100 };
101 
102 int pmic_init(unsigned char bus)
103 {
104 	static const char name[] = "MAX8997_PMIC";
105 	struct pmic *p = pmic_alloc();
106 
107 	if (!p) {
108 		printf("%s: POWER allocation error!\n", __func__);
109 		return -ENOMEM;
110 	}
111 
112 	debug("Board PMIC init\n");
113 
114 	p->name = name;
115 	p->interface = PMIC_I2C;
116 	p->number_of_regs = PMIC_NUM_OF_REGS;
117 	p->hw.i2c.addr = MAX8997_I2C_ADDR;
118 	p->hw.i2c.tx_num = 1;
119 	p->bus = bus;
120 
121 	p->chrg = &power_chrg_pmic_ops;
122 	return 0;
123 }
124