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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
35 #define CHGIN_ILIM_STEP_20mA 20000
36
37 /* CHARGER regulator ops */
38 /* CHARGER regulator uses two bits for enabling */
39 static int max77693_chg_is_enabled(struct regulator_dev *rdev)
40 {
41 int ret;
42 u8 val;
43
44 ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
45 if (ret)
46 return ret;
47
48 return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
49 }
50
51 /*
52 * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
53 * 0x00, 0x01, 0x2, 0x03 = 60 mA
54 * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
55 */
56 static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
57 {
58 unsigned int chg_min_uA = rdev->constraints->min_uA;
59 unsigned int chg_max_uA = rdev->constraints->max_uA;
60 u8 reg, sel;
61 unsigned int val;
62 int ret;
63
64 ret = max77693_read_reg(rdev->regmap,
65 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
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 max77693_write_reg(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 .n_voltages = 4, \
132 .ops = &max77693_safeout_ops, \
133 .type = REGULATOR_VOLTAGE, \
134 .owner = THIS_MODULE, \
135 .volt_table = max77693_safeout_table, \
136 .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
137 .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
138 .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
139 .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
140 }
141
142 static struct regulator_desc regulators[] = {
143 regulator_desc_esafeout(1),
144 regulator_desc_esafeout(2),
145 {
146 .name = "CHARGER",
147 .id = MAX77693_CHARGER,
148 .ops = &max77693_charger_ops,
149 .type = REGULATOR_CURRENT,
150 .owner = THIS_MODULE,
151 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
152 .enable_mask = CHG_CNFG_00_CHG_MASK |
153 CHG_CNFG_00_BUCK_MASK,
154 },
155 };
156
157 #ifdef CONFIG_OF
158 static int max77693_pmic_dt_parse_rdata(struct device *dev,
159 struct max77693_regulator_data **rdata)
160 {
161 struct device_node *np;
162 struct of_regulator_match *rmatch;
163 struct max77693_regulator_data *tmp;
164 int i, matched = 0;
165
166 np = of_get_child_by_name(dev->parent->of_node, "regulators");
167 if (!np)
168 return -EINVAL;
169
170 rmatch = devm_kzalloc(dev,
171 sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
172 if (!rmatch) {
173 of_node_put(np);
174 return -ENOMEM;
175 }
176
177 for (i = 0; i < ARRAY_SIZE(regulators); i++)
178 rmatch[i].name = regulators[i].name;
179
180 matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
181 of_node_put(np);
182 if (matched <= 0)
183 return matched;
184 *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
185 if (!(*rdata))
186 return -ENOMEM;
187
188 tmp = *rdata;
189
190 for (i = 0; i < matched; i++) {
191 tmp->initdata = rmatch[i].init_data;
192 tmp->of_node = rmatch[i].of_node;
193 tmp->id = regulators[i].id;
194 tmp++;
195 }
196
197 return matched;
198 }
199 #else
200 static int max77693_pmic_dt_parse_rdata(struct device *dev,
201 struct max77693_regulator_data **rdata)
202 {
203 return 0;
204 }
205 #endif /* CONFIG_OF */
206
207 static int max77693_pmic_init_rdata(struct device *dev,
208 struct max77693_regulator_data **rdata)
209 {
210 struct max77693_platform_data *pdata;
211 int num_regulators = 0;
212
213 pdata = dev_get_platdata(dev->parent);
214 if (pdata) {
215 *rdata = pdata->regulators;
216 num_regulators = pdata->num_regulators;
217 }
218
219 if (!(*rdata) && dev->parent->of_node)
220 num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
221
222 return num_regulators;
223 }
224
225 static int max77693_pmic_probe(struct platform_device *pdev)
226 {
227 struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
228 struct max77693_regulator_data *rdata = NULL;
229 int num_rdata, i;
230 struct regulator_config config;
231
232 num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
233 if (!rdata || num_rdata <= 0) {
234 dev_err(&pdev->dev, "No init data supplied.\n");
235 return -ENODEV;
236 }
237
238 config.dev = &pdev->dev;
239 config.regmap = iodev->regmap;
240
241 for (i = 0; i < num_rdata; i++) {
242 int id = rdata[i].id;
243 struct regulator_dev *rdev;
244
245 config.init_data = rdata[i].initdata;
246 config.of_node = rdata[i].of_node;
247
248 rdev = devm_regulator_register(&pdev->dev,
249 &regulators[id], &config);
250 if (IS_ERR(rdev)) {
251 dev_err(&pdev->dev,
252 "Failed to initialize regulator-%d\n", id);
253 return PTR_ERR(rdev);
254 }
255 }
256
257 return 0;
258 }
259
260 static const struct platform_device_id max77693_pmic_id[] = {
261 {"max77693-pmic", 0},
262 {},
263 };
264
265 MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
266
267 static struct platform_driver max77693_pmic_driver = {
268 .driver = {
269 .name = "max77693-pmic",
270 .owner = THIS_MODULE,
271 },
272 .probe = max77693_pmic_probe,
273 .id_table = max77693_pmic_id,
274 };
275
276 module_platform_driver(max77693_pmic_driver);
277
278 MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
279 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
280 MODULE_LICENSE("GPL");