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80b022e2 JL |
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 | struct max77693_pmic_dev { | |
38 | struct device *dev; | |
39 | struct max77693_dev *iodev; | |
40 | int num_regulators; | |
41 | struct regulator_dev **rdev; | |
42 | }; | |
43 | ||
44 | /* CHARGER regulator ops */ | |
45 | /* CHARGER regulator uses two bits for enabling */ | |
46 | static int max77693_chg_is_enabled(struct regulator_dev *rdev) | |
47 | { | |
48 | int ret; | |
49 | u8 val; | |
50 | ||
51 | ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val); | |
52 | if (ret) | |
53 | return ret; | |
54 | ||
55 | return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask; | |
56 | } | |
57 | ||
58 | /* | |
59 | * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA | |
60 | * 0x00, 0x01, 0x2, 0x03 = 60 mA | |
61 | * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA | |
62 | */ | |
63 | static int max77693_chg_get_current_limit(struct regulator_dev *rdev) | |
64 | { | |
65 | unsigned int chg_min_uA = rdev->constraints->min_uA; | |
66 | unsigned int chg_max_uA = rdev->constraints->max_uA; | |
67 | u8 reg, sel; | |
68 | unsigned int val; | |
69 | int ret; | |
70 | ||
71 | ret = max77693_read_reg(rdev->regmap, | |
72 | MAX77693_CHG_REG_CHG_CNFG_09, ®); | |
73 | if (ret < 0) | |
74 | return ret; | |
75 | ||
76 | sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK; | |
77 | ||
78 | /* the first four codes for charger current are all 60mA */ | |
79 | if (sel <= 3) | |
80 | sel = 0; | |
81 | else | |
82 | sel -= 3; | |
83 | ||
84 | val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel; | |
85 | if (val > chg_max_uA) | |
86 | return -EINVAL; | |
87 | ||
88 | return val; | |
89 | } | |
90 | ||
91 | static int max77693_chg_set_current_limit(struct regulator_dev *rdev, | |
92 | int min_uA, int max_uA) | |
93 | { | |
94 | unsigned int chg_min_uA = rdev->constraints->min_uA; | |
95 | int sel = 0; | |
96 | ||
97 | while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA) | |
98 | sel++; | |
99 | ||
f3ecdd7b | 100 | if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA) |
80b022e2 JL |
101 | return -EINVAL; |
102 | ||
103 | /* the first four codes for charger current are all 60mA */ | |
104 | sel += 3; | |
105 | ||
106 | return max77693_write_reg(rdev->regmap, | |
107 | MAX77693_CHG_REG_CHG_CNFG_09, sel); | |
108 | } | |
109 | /* end of CHARGER regulator ops */ | |
110 | ||
111 | static const unsigned int max77693_safeout_table[] = { | |
112 | 4850000, | |
113 | 4900000, | |
114 | 4950000, | |
115 | 3300000, | |
116 | }; | |
117 | ||
118 | static struct regulator_ops max77693_safeout_ops = { | |
119 | .list_voltage = regulator_list_voltage_table, | |
120 | .is_enabled = regulator_is_enabled_regmap, | |
121 | .enable = regulator_enable_regmap, | |
122 | .disable = regulator_disable_regmap, | |
123 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
124 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
125 | }; | |
126 | ||
127 | static struct regulator_ops max77693_charger_ops = { | |
128 | .is_enabled = max77693_chg_is_enabled, | |
129 | .enable = regulator_enable_regmap, | |
130 | .disable = regulator_disable_regmap, | |
131 | .get_current_limit = max77693_chg_get_current_limit, | |
132 | .set_current_limit = max77693_chg_set_current_limit, | |
133 | }; | |
134 | ||
135 | #define regulator_desc_esafeout(_num) { \ | |
136 | .name = "ESAFEOUT"#_num, \ | |
137 | .id = MAX77693_ESAFEOUT##_num, \ | |
138 | .n_voltages = 4, \ | |
139 | .ops = &max77693_safeout_ops, \ | |
140 | .type = REGULATOR_VOLTAGE, \ | |
52f48bf3 | 141 | .owner = THIS_MODULE, \ |
80b022e2 JL |
142 | .volt_table = max77693_safeout_table, \ |
143 | .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ | |
144 | .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \ | |
145 | .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ | |
146 | .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \ | |
147 | } | |
148 | ||
149 | static struct regulator_desc regulators[] = { | |
150 | regulator_desc_esafeout(1), | |
151 | regulator_desc_esafeout(2), | |
152 | { | |
153 | .name = "CHARGER", | |
154 | .id = MAX77693_CHARGER, | |
155 | .ops = &max77693_charger_ops, | |
156 | .type = REGULATOR_CURRENT, | |
157 | .owner = THIS_MODULE, | |
158 | .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00, | |
159 | .enable_mask = CHG_CNFG_00_CHG_MASK | | |
160 | CHG_CNFG_00_BUCK_MASK, | |
161 | }, | |
162 | }; | |
163 | ||
164 | #ifdef CONFIG_OF | |
165 | static int max77693_pmic_dt_parse_rdata(struct device *dev, | |
166 | struct max77693_regulator_data **rdata) | |
167 | { | |
168 | struct device_node *np; | |
169 | struct of_regulator_match *rmatch; | |
170 | struct max77693_regulator_data *tmp; | |
171 | int i, matched = 0; | |
172 | ||
173 | np = of_find_node_by_name(dev->parent->of_node, "regulators"); | |
174 | if (!np) | |
175 | return -EINVAL; | |
176 | ||
177 | rmatch = devm_kzalloc(dev, | |
178 | sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL); | |
179 | if (!rmatch) | |
180 | return -ENOMEM; | |
181 | ||
182 | for (i = 0; i < ARRAY_SIZE(regulators); i++) | |
183 | rmatch[i].name = regulators[i].name; | |
184 | ||
185 | matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators)); | |
186 | if (matched <= 0) | |
187 | return matched; | |
188 | *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL); | |
189 | if (!(*rdata)) | |
190 | return -ENOMEM; | |
191 | ||
192 | tmp = *rdata; | |
193 | ||
8c7e7ddf | 194 | for (i = 0; i < matched; i++) { |
80b022e2 JL |
195 | tmp->initdata = rmatch[i].init_data; |
196 | tmp->of_node = rmatch[i].of_node; | |
197 | tmp->id = regulators[i].id; | |
198 | tmp++; | |
199 | } | |
200 | ||
201 | return matched; | |
202 | } | |
203 | #else | |
204 | static int max77693_pmic_dt_parse_rdata(struct device *dev, | |
205 | struct max77693_regulator_data **rdata) | |
206 | { | |
207 | return 0; | |
208 | } | |
209 | #endif /* CONFIG_OF */ | |
210 | ||
211 | static int max77693_pmic_init_rdata(struct device *dev, | |
212 | struct max77693_regulator_data **rdata) | |
213 | { | |
214 | struct max77693_platform_data *pdata; | |
215 | int num_regulators = 0; | |
216 | ||
217 | pdata = dev_get_platdata(dev->parent); | |
218 | if (pdata) { | |
219 | *rdata = pdata->regulators; | |
220 | num_regulators = pdata->num_regulators; | |
221 | } | |
222 | ||
223 | if (!(*rdata) && dev->parent->of_node) | |
224 | num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata); | |
225 | ||
226 | return num_regulators; | |
227 | } | |
228 | ||
229 | static int max77693_pmic_probe(struct platform_device *pdev) | |
230 | { | |
231 | struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
232 | struct max77693_pmic_dev *max77693_pmic; | |
233 | struct max77693_regulator_data *rdata = NULL; | |
027a2754 | 234 | int num_rdata, i; |
80b022e2 JL |
235 | struct regulator_config config; |
236 | ||
237 | num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata); | |
238 | if (!rdata || num_rdata <= 0) { | |
239 | dev_err(&pdev->dev, "No init data supplied.\n"); | |
240 | return -ENODEV; | |
241 | } | |
242 | ||
243 | max77693_pmic = devm_kzalloc(&pdev->dev, | |
244 | sizeof(struct max77693_pmic_dev), | |
245 | GFP_KERNEL); | |
246 | if (!max77693_pmic) | |
247 | return -ENOMEM; | |
248 | ||
249 | max77693_pmic->rdev = devm_kzalloc(&pdev->dev, | |
250 | sizeof(struct regulator_dev *) * num_rdata, | |
251 | GFP_KERNEL); | |
252 | if (!max77693_pmic->rdev) | |
253 | return -ENOMEM; | |
254 | ||
255 | max77693_pmic->dev = &pdev->dev; | |
256 | max77693_pmic->iodev = iodev; | |
257 | max77693_pmic->num_regulators = num_rdata; | |
258 | ||
259 | config.dev = &pdev->dev; | |
260 | config.regmap = iodev->regmap; | |
261 | config.driver_data = max77693_pmic; | |
262 | platform_set_drvdata(pdev, max77693_pmic); | |
263 | ||
264 | for (i = 0; i < max77693_pmic->num_regulators; i++) { | |
265 | int id = rdata[i].id; | |
266 | ||
267 | config.init_data = rdata[i].initdata; | |
268 | config.of_node = rdata[i].of_node; | |
269 | ||
027a2754 SK |
270 | max77693_pmic->rdev[i] = devm_regulator_register(&pdev->dev, |
271 | ®ulators[id], &config); | |
80b022e2 | 272 | if (IS_ERR(max77693_pmic->rdev[i])) { |
80b022e2 JL |
273 | dev_err(max77693_pmic->dev, |
274 | "Failed to initialize regulator-%d\n", id); | |
027a2754 | 275 | return PTR_ERR(max77693_pmic->rdev[i]); |
80b022e2 JL |
276 | } |
277 | } | |
278 | ||
80b022e2 JL |
279 | return 0; |
280 | } | |
281 | ||
282 | static const struct platform_device_id max77693_pmic_id[] = { | |
283 | {"max77693-pmic", 0}, | |
284 | {}, | |
285 | }; | |
286 | ||
287 | MODULE_DEVICE_TABLE(platform, max77693_pmic_id); | |
288 | ||
289 | static struct platform_driver max77693_pmic_driver = { | |
290 | .driver = { | |
291 | .name = "max77693-pmic", | |
292 | .owner = THIS_MODULE, | |
293 | }, | |
294 | .probe = max77693_pmic_probe, | |
80b022e2 JL |
295 | .id_table = max77693_pmic_id, |
296 | }; | |
297 | ||
298 | module_platform_driver(max77693_pmic_driver); | |
299 | ||
300 | MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver"); | |
301 | MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); | |
302 | MODULE_LICENSE("GPL"); |