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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, \ | |
141 | .volt_table = max77693_safeout_table, \ | |
142 | .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ | |
143 | .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \ | |
144 | .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \ | |
145 | .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \ | |
146 | } | |
147 | ||
148 | static struct regulator_desc regulators[] = { | |
149 | regulator_desc_esafeout(1), | |
150 | regulator_desc_esafeout(2), | |
151 | { | |
152 | .name = "CHARGER", | |
153 | .id = MAX77693_CHARGER, | |
154 | .ops = &max77693_charger_ops, | |
155 | .type = REGULATOR_CURRENT, | |
156 | .owner = THIS_MODULE, | |
157 | .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00, | |
158 | .enable_mask = CHG_CNFG_00_CHG_MASK | | |
159 | CHG_CNFG_00_BUCK_MASK, | |
160 | }, | |
161 | }; | |
162 | ||
163 | #ifdef CONFIG_OF | |
164 | static int max77693_pmic_dt_parse_rdata(struct device *dev, | |
165 | struct max77693_regulator_data **rdata) | |
166 | { | |
167 | struct device_node *np; | |
168 | struct of_regulator_match *rmatch; | |
169 | struct max77693_regulator_data *tmp; | |
170 | int i, matched = 0; | |
171 | ||
172 | np = of_find_node_by_name(dev->parent->of_node, "regulators"); | |
173 | if (!np) | |
174 | return -EINVAL; | |
175 | ||
176 | rmatch = devm_kzalloc(dev, | |
177 | sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL); | |
178 | if (!rmatch) | |
179 | return -ENOMEM; | |
180 | ||
181 | for (i = 0; i < ARRAY_SIZE(regulators); i++) | |
182 | rmatch[i].name = regulators[i].name; | |
183 | ||
184 | matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators)); | |
185 | if (matched <= 0) | |
186 | return matched; | |
187 | *rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL); | |
188 | if (!(*rdata)) | |
189 | return -ENOMEM; | |
190 | ||
191 | tmp = *rdata; | |
192 | ||
8c7e7ddf | 193 | for (i = 0; i < matched; i++) { |
80b022e2 JL |
194 | tmp->initdata = rmatch[i].init_data; |
195 | tmp->of_node = rmatch[i].of_node; | |
196 | tmp->id = regulators[i].id; | |
197 | tmp++; | |
198 | } | |
199 | ||
200 | return matched; | |
201 | } | |
202 | #else | |
203 | static int max77693_pmic_dt_parse_rdata(struct device *dev, | |
204 | struct max77693_regulator_data **rdata) | |
205 | { | |
206 | return 0; | |
207 | } | |
208 | #endif /* CONFIG_OF */ | |
209 | ||
210 | static int max77693_pmic_init_rdata(struct device *dev, | |
211 | struct max77693_regulator_data **rdata) | |
212 | { | |
213 | struct max77693_platform_data *pdata; | |
214 | int num_regulators = 0; | |
215 | ||
216 | pdata = dev_get_platdata(dev->parent); | |
217 | if (pdata) { | |
218 | *rdata = pdata->regulators; | |
219 | num_regulators = pdata->num_regulators; | |
220 | } | |
221 | ||
222 | if (!(*rdata) && dev->parent->of_node) | |
223 | num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata); | |
224 | ||
225 | return num_regulators; | |
226 | } | |
227 | ||
228 | static int max77693_pmic_probe(struct platform_device *pdev) | |
229 | { | |
230 | struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
231 | struct max77693_pmic_dev *max77693_pmic; | |
232 | struct max77693_regulator_data *rdata = NULL; | |
027a2754 | 233 | int num_rdata, i; |
80b022e2 JL |
234 | struct regulator_config config; |
235 | ||
236 | num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata); | |
237 | if (!rdata || num_rdata <= 0) { | |
238 | dev_err(&pdev->dev, "No init data supplied.\n"); | |
239 | return -ENODEV; | |
240 | } | |
241 | ||
242 | max77693_pmic = devm_kzalloc(&pdev->dev, | |
243 | sizeof(struct max77693_pmic_dev), | |
244 | GFP_KERNEL); | |
245 | if (!max77693_pmic) | |
246 | return -ENOMEM; | |
247 | ||
248 | max77693_pmic->rdev = devm_kzalloc(&pdev->dev, | |
249 | sizeof(struct regulator_dev *) * num_rdata, | |
250 | GFP_KERNEL); | |
251 | if (!max77693_pmic->rdev) | |
252 | return -ENOMEM; | |
253 | ||
254 | max77693_pmic->dev = &pdev->dev; | |
255 | max77693_pmic->iodev = iodev; | |
256 | max77693_pmic->num_regulators = num_rdata; | |
257 | ||
258 | config.dev = &pdev->dev; | |
259 | config.regmap = iodev->regmap; | |
260 | config.driver_data = max77693_pmic; | |
261 | platform_set_drvdata(pdev, max77693_pmic); | |
262 | ||
263 | for (i = 0; i < max77693_pmic->num_regulators; i++) { | |
264 | int id = rdata[i].id; | |
265 | ||
266 | config.init_data = rdata[i].initdata; | |
267 | config.of_node = rdata[i].of_node; | |
268 | ||
027a2754 SK |
269 | max77693_pmic->rdev[i] = devm_regulator_register(&pdev->dev, |
270 | ®ulators[id], &config); | |
80b022e2 | 271 | if (IS_ERR(max77693_pmic->rdev[i])) { |
80b022e2 JL |
272 | dev_err(max77693_pmic->dev, |
273 | "Failed to initialize regulator-%d\n", id); | |
027a2754 | 274 | return PTR_ERR(max77693_pmic->rdev[i]); |
80b022e2 JL |
275 | } |
276 | } | |
277 | ||
80b022e2 JL |
278 | return 0; |
279 | } | |
280 | ||
281 | static const struct platform_device_id max77693_pmic_id[] = { | |
282 | {"max77693-pmic", 0}, | |
283 | {}, | |
284 | }; | |
285 | ||
286 | MODULE_DEVICE_TABLE(platform, max77693_pmic_id); | |
287 | ||
288 | static struct platform_driver max77693_pmic_driver = { | |
289 | .driver = { | |
290 | .name = "max77693-pmic", | |
291 | .owner = THIS_MODULE, | |
292 | }, | |
293 | .probe = max77693_pmic_probe, | |
80b022e2 JL |
294 | .id_table = max77693_pmic_id, |
295 | }; | |
296 | ||
297 | module_platform_driver(max77693_pmic_driver); | |
298 | ||
299 | MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver"); | |
300 | MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); | |
301 | MODULE_LICENSE("GPL"); |