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Linux/drivers/regulator/act8865-regulator.c

  1 /*
  2  * act8865-regulator.c - Voltage regulation for active-semi ACT88xx PMUs
  3  *
  4  * http://www.active-semi.com/products/power-management-units/act88xx/
  5  *
  6  * Copyright (C) 2013 Atmel Corporation
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  */
 18 
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <linux/i2c.h>
 22 #include <linux/err.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/regulator/driver.h>
 25 #include <linux/regulator/act8865.h>
 26 #include <linux/of.h>
 27 #include <linux/of_device.h>
 28 #include <linux/regulator/of_regulator.h>
 29 #include <linux/regmap.h>
 30 
 31 /*
 32  * ACT8846 Global Register Map.
 33  */
 34 #define ACT8846_SYS0            0x00
 35 #define ACT8846_SYS1            0x01
 36 #define ACT8846_REG1_VSET       0x10
 37 #define ACT8846_REG1_CTRL       0x12
 38 #define ACT8846_REG2_VSET0      0x20
 39 #define ACT8846_REG2_VSET1      0x21
 40 #define ACT8846_REG2_CTRL       0x22
 41 #define ACT8846_REG3_VSET0      0x30
 42 #define ACT8846_REG3_VSET1      0x31
 43 #define ACT8846_REG3_CTRL       0x32
 44 #define ACT8846_REG4_VSET0      0x40
 45 #define ACT8846_REG4_VSET1      0x41
 46 #define ACT8846_REG4_CTRL       0x42
 47 #define ACT8846_REG5_VSET       0x50
 48 #define ACT8846_REG5_CTRL       0x51
 49 #define ACT8846_REG6_VSET       0x58
 50 #define ACT8846_REG6_CTRL       0x59
 51 #define ACT8846_REG7_VSET       0x60
 52 #define ACT8846_REG7_CTRL       0x61
 53 #define ACT8846_REG8_VSET       0x68
 54 #define ACT8846_REG8_CTRL       0x69
 55 #define ACT8846_REG9_VSET       0x70
 56 #define ACT8846_REG9_CTRL       0x71
 57 #define ACT8846_REG10_VSET      0x80
 58 #define ACT8846_REG10_CTRL      0x81
 59 #define ACT8846_REG11_VSET      0x90
 60 #define ACT8846_REG11_CTRL      0x91
 61 #define ACT8846_REG12_VSET      0xa0
 62 #define ACT8846_REG12_CTRL      0xa1
 63 #define ACT8846_REG13_CTRL      0xb1
 64 
 65 /*
 66  * ACT8865 Global Register Map.
 67  */
 68 #define ACT8865_SYS_MODE        0x00
 69 #define ACT8865_SYS_CTRL        0x01
 70 #define ACT8865_DCDC1_VSET1     0x20
 71 #define ACT8865_DCDC1_VSET2     0x21
 72 #define ACT8865_DCDC1_CTRL      0x22
 73 #define ACT8865_DCDC2_VSET1     0x30
 74 #define ACT8865_DCDC2_VSET2     0x31
 75 #define ACT8865_DCDC2_CTRL      0x32
 76 #define ACT8865_DCDC3_VSET1     0x40
 77 #define ACT8865_DCDC3_VSET2     0x41
 78 #define ACT8865_DCDC3_CTRL      0x42
 79 #define ACT8865_LDO1_VSET       0x50
 80 #define ACT8865_LDO1_CTRL       0x51
 81 #define ACT8865_LDO2_VSET       0x54
 82 #define ACT8865_LDO2_CTRL       0x55
 83 #define ACT8865_LDO3_VSET       0x60
 84 #define ACT8865_LDO3_CTRL       0x61
 85 #define ACT8865_LDO4_VSET       0x64
 86 #define ACT8865_LDO4_CTRL       0x65
 87 
 88 /*
 89  * Field Definitions.
 90  */
 91 #define ACT8865_ENA             0x80    /* ON - [7] */
 92 #define ACT8865_VSEL_MASK       0x3F    /* VSET - [5:0] */
 93 
 94 /*
 95  * ACT8865 voltage number
 96  */
 97 #define ACT8865_VOLTAGE_NUM     64
 98 
 99 struct act8865 {
100         struct regmap *regmap;
101 };
102 
103 static const struct regmap_config act8865_regmap_config = {
104         .reg_bits = 8,
105         .val_bits = 8,
106 };
107 
108 static const struct regulator_linear_range act8865_voltage_ranges[] = {
109         REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
110         REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
111         REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
112 };
113 
114 static struct regulator_ops act8865_ops = {
115         .list_voltage           = regulator_list_voltage_linear_range,
116         .map_voltage            = regulator_map_voltage_linear_range,
117         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
118         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
119         .enable                 = regulator_enable_regmap,
120         .disable                = regulator_disable_regmap,
121         .is_enabled             = regulator_is_enabled_regmap,
122 };
123 
124 #define ACT88xx_REG(_name, _family, _id, _vsel_reg)                     \
125         [_family##_ID_##_id] = {                                        \
126                 .name                   = _name,                        \
127                 .id                     = _family##_ID_##_id,           \
128                 .type                   = REGULATOR_VOLTAGE,            \
129                 .ops                    = &act8865_ops,                 \
130                 .n_voltages             = ACT8865_VOLTAGE_NUM,          \
131                 .linear_ranges          = act8865_voltage_ranges,       \
132                 .n_linear_ranges        = ARRAY_SIZE(act8865_voltage_ranges), \
133                 .vsel_reg               = _family##_##_id##_##_vsel_reg, \
134                 .vsel_mask              = ACT8865_VSEL_MASK,            \
135                 .enable_reg             = _family##_##_id##_CTRL,       \
136                 .enable_mask            = ACT8865_ENA,                  \
137                 .owner                  = THIS_MODULE,                  \
138         }
139 
140 static const struct regulator_desc act8846_regulators[] = {
141         ACT88xx_REG("REG1", ACT8846, REG1, VSET),
142         ACT88xx_REG("REG2", ACT8846, REG2, VSET0),
143         ACT88xx_REG("REG3", ACT8846, REG3, VSET0),
144         ACT88xx_REG("REG4", ACT8846, REG4, VSET0),
145         ACT88xx_REG("REG5", ACT8846, REG5, VSET),
146         ACT88xx_REG("REG6", ACT8846, REG6, VSET),
147         ACT88xx_REG("REG7", ACT8846, REG7, VSET),
148         ACT88xx_REG("REG8", ACT8846, REG8, VSET),
149         ACT88xx_REG("REG9", ACT8846, REG9, VSET),
150         ACT88xx_REG("REG10", ACT8846, REG10, VSET),
151         ACT88xx_REG("REG11", ACT8846, REG11, VSET),
152         ACT88xx_REG("REG12", ACT8846, REG12, VSET),
153 };
154 
155 static const struct regulator_desc act8865_regulators[] = {
156         ACT88xx_REG("DCDC_REG1", ACT8865, DCDC1, VSET1),
157         ACT88xx_REG("DCDC_REG2", ACT8865, DCDC2, VSET1),
158         ACT88xx_REG("DCDC_REG3", ACT8865, DCDC3, VSET1),
159         ACT88xx_REG("LDO_REG1", ACT8865, LDO1, VSET),
160         ACT88xx_REG("LDO_REG2", ACT8865, LDO2, VSET),
161         ACT88xx_REG("LDO_REG3", ACT8865, LDO3, VSET),
162         ACT88xx_REG("LDO_REG4", ACT8865, LDO4, VSET),
163 };
164 
165 #ifdef CONFIG_OF
166 static const struct of_device_id act8865_dt_ids[] = {
167         { .compatible = "active-semi,act8846", .data = (void *)ACT8846 },
168         { .compatible = "active-semi,act8865", .data = (void *)ACT8865 },
169         { }
170 };
171 MODULE_DEVICE_TABLE(of, act8865_dt_ids);
172 
173 static struct of_regulator_match act8846_matches[] = {
174         [ACT8846_ID_REG1]       = { .name = "REG1" },
175         [ACT8846_ID_REG2]       = { .name = "REG2" },
176         [ACT8846_ID_REG3]       = { .name = "REG3" },
177         [ACT8846_ID_REG4]       = { .name = "REG4" },
178         [ACT8846_ID_REG5]       = { .name = "REG5" },
179         [ACT8846_ID_REG6]       = { .name = "REG6" },
180         [ACT8846_ID_REG7]       = { .name = "REG7" },
181         [ACT8846_ID_REG8]       = { .name = "REG8" },
182         [ACT8846_ID_REG9]       = { .name = "REG9" },
183         [ACT8846_ID_REG10]      = { .name = "REG10" },
184         [ACT8846_ID_REG11]      = { .name = "REG11" },
185         [ACT8846_ID_REG12]      = { .name = "REG12" },
186 };
187 
188 static struct of_regulator_match act8865_matches[] = {
189         [ACT8865_ID_DCDC1]      = { .name = "DCDC_REG1"},
190         [ACT8865_ID_DCDC2]      = { .name = "DCDC_REG2"},
191         [ACT8865_ID_DCDC3]      = { .name = "DCDC_REG3"},
192         [ACT8865_ID_LDO1]       = { .name = "LDO_REG1"},
193         [ACT8865_ID_LDO2]       = { .name = "LDO_REG2"},
194         [ACT8865_ID_LDO3]       = { .name = "LDO_REG3"},
195         [ACT8865_ID_LDO4]       = { .name = "LDO_REG4"},
196 };
197 
198 static int act8865_pdata_from_dt(struct device *dev,
199                                  struct device_node **of_node,
200                                  struct act8865_platform_data *pdata,
201                                  unsigned long type)
202 {
203         int matched, i, num_matches;
204         struct device_node *np;
205         struct act8865_regulator_data *regulator;
206         struct of_regulator_match *matches;
207 
208         np = of_get_child_by_name(dev->of_node, "regulators");
209         if (!np) {
210                 dev_err(dev, "missing 'regulators' subnode in DT\n");
211                 return -EINVAL;
212         }
213 
214         switch (type) {
215         case ACT8846:
216                 matches = act8846_matches;
217                 num_matches = ARRAY_SIZE(act8846_matches);
218                 break;
219         case ACT8865:
220                 matches = act8865_matches;
221                 num_matches = ARRAY_SIZE(act8865_matches);
222                 break;
223         default:
224                 dev_err(dev, "invalid device id %lu\n", type);
225                 return -EINVAL;
226         }
227 
228         matched = of_regulator_match(dev, np, matches, num_matches);
229         of_node_put(np);
230         if (matched <= 0)
231                 return matched;
232 
233         pdata->regulators = devm_kzalloc(dev,
234                                          sizeof(struct act8865_regulator_data) *
235                                          num_matches, GFP_KERNEL);
236         if (!pdata->regulators)
237                 return -ENOMEM;
238 
239         pdata->num_regulators = num_matches;
240         regulator = pdata->regulators;
241 
242         for (i = 0; i < num_matches; i++) {
243                 regulator->id = i;
244                 regulator->name = matches[i].name;
245                 regulator->platform_data = matches[i].init_data;
246                 of_node[i] = matches[i].of_node;
247                 regulator++;
248         }
249 
250         return 0;
251 }
252 #else
253 static inline int act8865_pdata_from_dt(struct device *dev,
254                                         struct device_node **of_node,
255                                         struct act8865_platform_data *pdata,
256                                         unsigned long type)
257 {
258         return 0;
259 }
260 #endif
261 
262 static struct regulator_init_data
263 *act8865_get_init_data(int id, struct act8865_platform_data *pdata)
264 {
265         int i;
266 
267         if (!pdata)
268                 return NULL;
269 
270         for (i = 0; i < pdata->num_regulators; i++) {
271                 if (pdata->regulators[i].id == id)
272                         return pdata->regulators[i].platform_data;
273         }
274 
275         return NULL;
276 }
277 
278 static int act8865_pmic_probe(struct i2c_client *client,
279                               const struct i2c_device_id *i2c_id)
280 {
281         static const struct regulator_desc *regulators;
282         struct act8865_platform_data pdata_of, *pdata;
283         struct device *dev = &client->dev;
284         struct device_node **of_node;
285         int i, ret, num_regulators;
286         struct act8865 *act8865;
287         unsigned long type;
288 
289         pdata = dev_get_platdata(dev);
290 
291         if (dev->of_node && !pdata) {
292                 const struct of_device_id *id;
293 
294                 id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
295                 if (!id)
296                         return -ENODEV;
297 
298                 type = (unsigned long) id->data;
299         } else {
300                 type = i2c_id->driver_data;
301         }
302 
303         switch (type) {
304         case ACT8846:
305                 regulators = act8846_regulators;
306                 num_regulators = ARRAY_SIZE(act8846_regulators);
307                 break;
308         case ACT8865:
309                 regulators = act8865_regulators;
310                 num_regulators = ARRAY_SIZE(act8865_regulators);
311                 break;
312         default:
313                 dev_err(dev, "invalid device id %lu\n", type);
314                 return -EINVAL;
315         }
316 
317         of_node = devm_kzalloc(dev, sizeof(struct device_node *) *
318                                num_regulators, GFP_KERNEL);
319         if (!of_node)
320                 return -ENOMEM;
321 
322         if (dev->of_node && !pdata) {
323                 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, type);
324                 if (ret < 0)
325                         return ret;
326 
327                 pdata = &pdata_of;
328         }
329 
330         if (pdata->num_regulators > num_regulators) {
331                 dev_err(dev, "too many regulators: %d\n",
332                         pdata->num_regulators);
333                 return -EINVAL;
334         }
335 
336         act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
337         if (!act8865)
338                 return -ENOMEM;
339 
340         act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
341         if (IS_ERR(act8865->regmap)) {
342                 ret = PTR_ERR(act8865->regmap);
343                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
344                         ret);
345                 return ret;
346         }
347 
348         /* Finally register devices */
349         for (i = 0; i < num_regulators; i++) {
350                 const struct regulator_desc *desc = &regulators[i];
351                 struct regulator_config config = { };
352                 struct regulator_dev *rdev;
353 
354                 config.dev = dev;
355                 config.init_data = act8865_get_init_data(desc->id, pdata);
356                 config.of_node = of_node[i];
357                 config.driver_data = act8865;
358                 config.regmap = act8865->regmap;
359 
360                 rdev = devm_regulator_register(&client->dev, desc, &config);
361                 if (IS_ERR(rdev)) {
362                         dev_err(dev, "failed to register %s\n", desc->name);
363                         return PTR_ERR(rdev);
364                 }
365         }
366 
367         i2c_set_clientdata(client, act8865);
368         devm_kfree(dev, of_node);
369 
370         return 0;
371 }
372 
373 static const struct i2c_device_id act8865_ids[] = {
374         { .name = "act8846", .driver_data = ACT8846 },
375         { .name = "act8865", .driver_data = ACT8865 },
376         { },
377 };
378 MODULE_DEVICE_TABLE(i2c, act8865_ids);
379 
380 static struct i2c_driver act8865_pmic_driver = {
381         .driver = {
382                 .name   = "act8865",
383                 .owner  = THIS_MODULE,
384         },
385         .probe          = act8865_pmic_probe,
386         .id_table       = act8865_ids,
387 };
388 
389 module_i2c_driver(act8865_pmic_driver);
390 
391 MODULE_DESCRIPTION("active-semi act88xx voltage regulator driver");
392 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
393 MODULE_LICENSE("GPL v2");
394 

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