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[~andy/linux] / drivers / regulator / act8865-regulator.c
1 /*
2  * act8865-regulator.c - Voltage regulation for the active-semi ACT8865
3  * http://www.active-semi.com/sheets/ACT8865_Datasheet.pdf
4  *
5  * Copyright (C) 2013 Atmel Corporation
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
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/i2c.h>
21 #include <linux/err.h>
22 #include <linux/platform_device.h>
23 #include <linux/regulator/driver.h>
24 #include <linux/regulator/act8865.h>
25 #include <linux/of.h>
26 #include <linux/of_device.h>
27 #include <linux/regulator/of_regulator.h>
28 #include <linux/regmap.h>
29
30 /*
31  * ACT8865 Global Register Map.
32  */
33 #define ACT8865_SYS_MODE        0x00
34 #define ACT8865_SYS_CTRL        0x01
35 #define ACT8865_DCDC1_VSET1     0x20
36 #define ACT8865_DCDC1_VSET2     0x21
37 #define ACT8865_DCDC1_CTRL      0x22
38 #define ACT8865_DCDC2_VSET1     0x30
39 #define ACT8865_DCDC2_VSET2     0x31
40 #define ACT8865_DCDC2_CTRL      0x32
41 #define ACT8865_DCDC3_VSET1     0x40
42 #define ACT8865_DCDC3_VSET2     0x41
43 #define ACT8865_DCDC3_CTRL      0x42
44 #define ACT8865_LDO1_VSET       0x50
45 #define ACT8865_LDO1_CTRL       0x51
46 #define ACT8865_LDO2_VSET       0x54
47 #define ACT8865_LDO2_CTRL       0x55
48 #define ACT8865_LDO3_VSET       0x60
49 #define ACT8865_LDO3_CTRL       0x61
50 #define ACT8865_LDO4_VSET       0x64
51 #define ACT8865_LDO4_CTRL       0x65
52
53 /*
54  * Field Definitions.
55  */
56 #define ACT8865_ENA             0x80    /* ON - [7] */
57 #define ACT8865_VSEL_MASK       0x3F    /* VSET - [5:0] */
58
59 /*
60  * ACT8865 voltage number
61  */
62 #define ACT8865_VOLTAGE_NUM     64
63
64 struct act8865 {
65         struct regulator_dev *rdev[ACT8865_REG_NUM];
66         struct regmap *regmap;
67 };
68
69 static const struct regmap_config act8865_regmap_config = {
70         .reg_bits = 8,
71         .val_bits = 8,
72 };
73
74 static const struct regulator_linear_range act8865_volatge_ranges[] = {
75         REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
76         REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
77         REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
78 };
79
80 static struct regulator_ops act8865_ops = {
81         .list_voltage           = regulator_list_voltage_linear_range,
82         .map_voltage            = regulator_map_voltage_linear_range,
83         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
84         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
85         .enable                 = regulator_enable_regmap,
86         .disable                = regulator_disable_regmap,
87         .is_enabled             = regulator_is_enabled_regmap,
88 };
89
90 static const struct regulator_desc act8865_reg[] = {
91         {
92                 .name = "DCDC_REG1",
93                 .id = ACT8865_ID_DCDC1,
94                 .ops = &act8865_ops,
95                 .type = REGULATOR_VOLTAGE,
96                 .n_voltages = ACT8865_VOLTAGE_NUM,
97                 .linear_ranges = act8865_volatge_ranges,
98                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
99                 .vsel_reg = ACT8865_DCDC1_VSET1,
100                 .vsel_mask = ACT8865_VSEL_MASK,
101                 .enable_reg = ACT8865_DCDC1_CTRL,
102                 .enable_mask = ACT8865_ENA,
103                 .owner = THIS_MODULE,
104         },
105         {
106                 .name = "DCDC_REG2",
107                 .id = ACT8865_ID_DCDC2,
108                 .ops = &act8865_ops,
109                 .type = REGULATOR_VOLTAGE,
110                 .n_voltages = ACT8865_VOLTAGE_NUM,
111                 .linear_ranges = act8865_volatge_ranges,
112                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
113                 .vsel_reg = ACT8865_DCDC2_VSET1,
114                 .vsel_mask = ACT8865_VSEL_MASK,
115                 .enable_reg = ACT8865_DCDC2_CTRL,
116                 .enable_mask = ACT8865_ENA,
117                 .owner = THIS_MODULE,
118         },
119         {
120                 .name = "DCDC_REG3",
121                 .id = ACT8865_ID_DCDC3,
122                 .ops = &act8865_ops,
123                 .type = REGULATOR_VOLTAGE,
124                 .n_voltages = ACT8865_VOLTAGE_NUM,
125                 .linear_ranges = act8865_volatge_ranges,
126                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
127                 .vsel_reg = ACT8865_DCDC3_VSET1,
128                 .vsel_mask = ACT8865_VSEL_MASK,
129                 .enable_reg = ACT8865_DCDC3_CTRL,
130                 .enable_mask = ACT8865_ENA,
131                 .owner = THIS_MODULE,
132         },
133         {
134                 .name = "LDO_REG1",
135                 .id = ACT8865_ID_LDO1,
136                 .ops = &act8865_ops,
137                 .type = REGULATOR_VOLTAGE,
138                 .n_voltages = ACT8865_VOLTAGE_NUM,
139                 .linear_ranges = act8865_volatge_ranges,
140                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
141                 .vsel_reg = ACT8865_LDO1_VSET,
142                 .vsel_mask = ACT8865_VSEL_MASK,
143                 .enable_reg = ACT8865_LDO1_CTRL,
144                 .enable_mask = ACT8865_ENA,
145                 .owner = THIS_MODULE,
146         },
147         {
148                 .name = "LDO_REG2",
149                 .id = ACT8865_ID_LDO2,
150                 .ops = &act8865_ops,
151                 .type = REGULATOR_VOLTAGE,
152                 .n_voltages = ACT8865_VOLTAGE_NUM,
153                 .linear_ranges = act8865_volatge_ranges,
154                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
155                 .vsel_reg = ACT8865_LDO2_VSET,
156                 .vsel_mask = ACT8865_VSEL_MASK,
157                 .enable_reg = ACT8865_LDO2_CTRL,
158                 .enable_mask = ACT8865_ENA,
159                 .owner = THIS_MODULE,
160         },
161         {
162                 .name = "LDO_REG3",
163                 .id = ACT8865_ID_LDO3,
164                 .ops = &act8865_ops,
165                 .type = REGULATOR_VOLTAGE,
166                 .n_voltages = ACT8865_VOLTAGE_NUM,
167                 .linear_ranges = act8865_volatge_ranges,
168                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
169                 .vsel_reg = ACT8865_LDO3_VSET,
170                 .vsel_mask = ACT8865_VSEL_MASK,
171                 .enable_reg = ACT8865_LDO3_CTRL,
172                 .enable_mask = ACT8865_ENA,
173                 .owner = THIS_MODULE,
174         },
175         {
176                 .name = "LDO_REG4",
177                 .id = ACT8865_ID_LDO4,
178                 .ops = &act8865_ops,
179                 .type = REGULATOR_VOLTAGE,
180                 .n_voltages = ACT8865_VOLTAGE_NUM,
181                 .linear_ranges = act8865_volatge_ranges,
182                 .n_linear_ranges = ARRAY_SIZE(act8865_volatge_ranges),
183                 .vsel_reg = ACT8865_LDO4_VSET,
184                 .vsel_mask = ACT8865_VSEL_MASK,
185                 .enable_reg = ACT8865_LDO4_CTRL,
186                 .enable_mask = ACT8865_ENA,
187                 .owner = THIS_MODULE,
188         },
189 };
190
191 #ifdef CONFIG_OF
192 static const struct of_device_id act8865_dt_ids[] = {
193         { .compatible = "active-semi,act8865" },
194         { }
195 };
196 MODULE_DEVICE_TABLE(of, act8865_dt_ids);
197
198 static struct of_regulator_match act8865_matches[] = {
199         [ACT8865_ID_DCDC1]      = { .name = "DCDC_REG1"},
200         [ACT8865_ID_DCDC2]      = { .name = "DCDC_REG2"},
201         [ACT8865_ID_DCDC3]      = { .name = "DCDC_REG3"},
202         [ACT8865_ID_LDO1]       = { .name = "LDO_REG1"},
203         [ACT8865_ID_LDO2]       = { .name = "LDO_REG2"},
204         [ACT8865_ID_LDO3]       = { .name = "LDO_REG3"},
205         [ACT8865_ID_LDO4]       = { .name = "LDO_REG4"},
206 };
207
208 static int act8865_pdata_from_dt(struct device *dev,
209                                  struct device_node **of_node,
210                                  struct act8865_platform_data *pdata)
211 {
212         int matched, i;
213         struct device_node *np;
214         struct act8865_regulator_data *regulator;
215
216         np = of_find_node_by_name(dev->of_node, "regulators");
217         if (!np) {
218                 dev_err(dev, "missing 'regulators' subnode in DT\n");
219                 return -EINVAL;
220         }
221
222         matched = of_regulator_match(dev, np,
223                                 act8865_matches, ARRAY_SIZE(act8865_matches));
224         if (matched <= 0)
225                 return matched;
226
227         pdata->regulators = devm_kzalloc(dev,
228                                 sizeof(struct act8865_regulator_data) *
229                                 ARRAY_SIZE(act8865_matches), GFP_KERNEL);
230         if (!pdata->regulators) {
231                 dev_err(dev, "%s: failed to allocate act8865 registor\n",
232                                                 __func__);
233                 return -ENOMEM;
234         }
235
236         pdata->num_regulators = matched;
237         regulator = pdata->regulators;
238
239         for (i = 0; i < ARRAY_SIZE(act8865_matches); i++) {
240                 regulator->id = i;
241                 regulator->name = act8865_matches[i].name;
242                 regulator->platform_data = act8865_matches[i].init_data;
243                 of_node[i] = act8865_matches[i].of_node;
244                 regulator++;
245         }
246
247         return 0;
248 }
249 #else
250 static inline int act8865_pdata_from_dt(struct device *dev,
251                                         struct device_node **of_node,
252                                         struct act8865_platform_data *pdata)
253 {
254         return 0;
255 }
256 #endif
257
258 static int act8865_pmic_probe(struct i2c_client *client,
259                            const struct i2c_device_id *i2c_id)
260 {
261         struct regulator_dev **rdev;
262         struct device *dev = &client->dev;
263         struct act8865_platform_data *pdata = dev_get_platdata(dev);
264         struct regulator_config config = { };
265         struct act8865 *act8865;
266         struct device_node *of_node[ACT8865_REG_NUM];
267         int i, id;
268         int ret = -EINVAL;
269         int error;
270
271         if (dev->of_node && !pdata) {
272                 const struct of_device_id *id;
273                 struct act8865_platform_data pdata_of;
274
275                 id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
276                 if (!id)
277                         return -ENODEV;
278
279                 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of);
280                 if (ret < 0)
281                         return ret;
282
283                 pdata = &pdata_of;
284         }
285
286         if (pdata->num_regulators > ACT8865_REG_NUM) {
287                 dev_err(dev, "Too many regulators found!\n");
288                 return -EINVAL;
289         }
290
291         act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
292         if (!act8865)
293                 return -ENOMEM;
294
295         rdev = act8865->rdev;
296
297         act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
298         if (IS_ERR(act8865->regmap)) {
299                 error = PTR_ERR(act8865->regmap);
300                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
301                         error);
302                 return error;
303         }
304
305         /* Finally register devices */
306         for (i = 0; i < ACT8865_REG_NUM; i++) {
307
308                 id = pdata->regulators[i].id;
309
310                 config.dev = dev;
311                 config.init_data = pdata->regulators[i].platform_data;
312                 config.of_node = of_node[i];
313                 config.driver_data = act8865;
314                 config.regmap = act8865->regmap;
315
316                 rdev[i] = devm_regulator_register(&client->dev,
317                                                 &act8865_reg[i], &config);
318                 if (IS_ERR(rdev[i])) {
319                         dev_err(dev, "failed to register %s\n",
320                                 act8865_reg[id].name);
321                         return PTR_ERR(rdev[i]);
322                 }
323         }
324
325         i2c_set_clientdata(client, act8865);
326
327         return 0;
328 }
329
330 static const struct i2c_device_id act8865_ids[] = {
331         { "act8865", 0 },
332         { },
333 };
334 MODULE_DEVICE_TABLE(i2c, act8865_ids);
335
336 static struct i2c_driver act8865_pmic_driver = {
337         .driver = {
338                 .name   = "act8865",
339                 .owner  = THIS_MODULE,
340         },
341         .probe          = act8865_pmic_probe,
342         .id_table       = act8865_ids,
343 };
344
345 module_i2c_driver(act8865_pmic_driver);
346
347 MODULE_DESCRIPTION("active-semi act8865 voltage regulator driver");
348 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
349 MODULE_LICENSE("GPL v2");