1/*
2 * max77693.c - Regulator driver for the Maxim 77693
3 *
4 * Copyright (C) 2013 Samsung Electronics
5 * Jonghwa Lee <jonghwa3.lee@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 *
21 * This driver is based on max77686.c
22 */
23
24#include <linux/err.h>
25#include <linux/slab.h>
26#include <linux/platform_device.h>
27#include <linux/module.h>
28#include <linux/export.h>
29#include <linux/regulator/driver.h>
30#include <linux/regulator/machine.h>
31#include <linux/mfd/max77693.h>
32#include <linux/mfd/max77693-private.h>
33#include <linux/regulator/of_regulator.h>
34#include <linux/regmap.h>
35
36#define CHGIN_ILIM_STEP_20mA			20000
37
38/* CHARGER regulator ops */
39/* CHARGER regulator uses two bits for enabling */
40static int max77693_chg_is_enabled(struct regulator_dev *rdev)
41{
42	int ret;
43	unsigned int val;
44
45	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
46	if (ret)
47		return ret;
48
49	return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
50}
51
52/*
53 * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
54 * 0x00, 0x01, 0x2, 0x03	= 60 mA
55 * 0x04 ~ 0x7E			= (60 + (X - 3) * 20) mA
56 */
57static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
58{
59	unsigned int chg_min_uA = rdev->constraints->min_uA;
60	unsigned int chg_max_uA = rdev->constraints->max_uA;
61	unsigned int reg, sel;
62	unsigned int val;
63	int ret;
64
65	ret = regmap_read(rdev->regmap, MAX77693_CHG_REG_CHG_CNFG_09, &reg);
66	if (ret < 0)
67		return ret;
68
69	sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
70
71	/* the first four codes for charger current are all 60mA */
72	if (sel <= 3)
73		sel = 0;
74	else
75		sel -= 3;
76
77	val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
78	if (val > chg_max_uA)
79		return -EINVAL;
80
81	return val;
82}
83
84static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
85						int min_uA, int max_uA)
86{
87	unsigned int chg_min_uA = rdev->constraints->min_uA;
88	int sel = 0;
89
90	while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
91		sel++;
92
93	if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
94		return -EINVAL;
95
96	/* the first four codes for charger current are all 60mA */
97	sel += 3;
98
99	return regmap_write(rdev->regmap,
100				MAX77693_CHG_REG_CHG_CNFG_09, sel);
101}
102/* end of CHARGER regulator ops */
103
104static const unsigned int max77693_safeout_table[] = {
105	4850000,
106	4900000,
107	4950000,
108	3300000,
109};
110
111static struct regulator_ops max77693_safeout_ops = {
112	.list_voltage		= regulator_list_voltage_table,
113	.is_enabled		= regulator_is_enabled_regmap,
114	.enable			= regulator_enable_regmap,
115	.disable		= regulator_disable_regmap,
116	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
117	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
118};
119
120static struct regulator_ops max77693_charger_ops = {
121	.is_enabled		= max77693_chg_is_enabled,
122	.enable			= regulator_enable_regmap,
123	.disable		= regulator_disable_regmap,
124	.get_current_limit	= max77693_chg_get_current_limit,
125	.set_current_limit	= max77693_chg_set_current_limit,
126};
127
128#define regulator_desc_esafeout(_num)	{			\
129	.name		= "ESAFEOUT"#_num,			\
130	.id		= MAX77693_ESAFEOUT##_num,		\
131	.of_match	= of_match_ptr("ESAFEOUT"#_num),	\
132	.regulators_node	= of_match_ptr("regulators"),	\
133	.n_voltages	= 4,					\
134	.ops		= &max77693_safeout_ops,		\
135	.type		= REGULATOR_VOLTAGE,			\
136	.owner		= THIS_MODULE,				\
137	.volt_table	= max77693_safeout_table,		\
138	.vsel_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
139	.vsel_mask	= SAFEOUT_CTRL_SAFEOUT##_num##_MASK,	\
140	.enable_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
141	.enable_mask	= SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK ,	\
142}
143
144static const struct regulator_desc regulators[] = {
145	regulator_desc_esafeout(1),
146	regulator_desc_esafeout(2),
147	{
148		.name = "CHARGER",
149		.id = MAX77693_CHARGER,
150		.of_match = of_match_ptr("CHARGER"),
151		.regulators_node = of_match_ptr("regulators"),
152		.ops = &max77693_charger_ops,
153		.type = REGULATOR_CURRENT,
154		.owner = THIS_MODULE,
155		.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
156		.enable_mask = CHG_CNFG_00_CHG_MASK |
157				CHG_CNFG_00_BUCK_MASK,
158	},
159};
160
161static int max77693_pmic_probe(struct platform_device *pdev)
162{
163	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
164	int i;
165	struct regulator_config config = { };
166
167	config.dev = iodev->dev;
168	config.regmap = iodev->regmap;
169
170	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
171		struct regulator_dev *rdev;
172
173		rdev = devm_regulator_register(&pdev->dev,
174						&regulators[i], &config);
175		if (IS_ERR(rdev)) {
176			dev_err(&pdev->dev,
177				"Failed to initialize regulator-%d\n", i);
178			return PTR_ERR(rdev);
179		}
180	}
181
182	return 0;
183}
184
185static const struct platform_device_id max77693_pmic_id[] = {
186	{"max77693-pmic", 0},
187	{},
188};
189
190MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
191
192static struct platform_driver max77693_pmic_driver = {
193	.driver = {
194		   .name = "max77693-pmic",
195		   },
196	.probe = max77693_pmic_probe,
197	.id_table = max77693_pmic_id,
198};
199
200module_platform_driver(max77693_pmic_driver);
201
202MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
203MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
204MODULE_LICENSE("GPL");
205