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 */
max77693_chg_is_enabled(struct regulator_dev * rdev)40 static 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 */
max77693_chg_get_current_limit(struct regulator_dev * rdev)57 static 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, ®);
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
max77693_chg_set_current_limit(struct regulator_dev * rdev,int min_uA,int max_uA)84 static 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
104 static const unsigned int max77693_safeout_table[] = {
105 4850000,
106 4900000,
107 4950000,
108 3300000,
109 };
110
111 static 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
120 static 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
144 static 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
max77693_pmic_probe(struct platform_device * pdev)161 static 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 ®ulators[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
185 static const struct platform_device_id max77693_pmic_id[] = {
186 {"max77693-pmic", 0},
187 {},
188 };
189
190 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
191
192 static 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
200 module_platform_driver(max77693_pmic_driver);
201
202 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
203 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
204 MODULE_LICENSE("GPL");
205