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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 #define ACT8846_GLB_OFF_CTRL    0xc3
 65 #define ACT8846_OFF_SYSMASK     0x18
 66 
 67 /*
 68  * ACT8865 Global Register Map.
 69  */
 70 #define ACT8865_SYS_MODE        0x00
 71 #define ACT8865_SYS_CTRL        0x01
 72 #define ACT8865_DCDC1_VSET1     0x20
 73 #define ACT8865_DCDC1_VSET2     0x21
 74 #define ACT8865_DCDC1_CTRL      0x22
 75 #define ACT8865_DCDC2_VSET1     0x30
 76 #define ACT8865_DCDC2_VSET2     0x31
 77 #define ACT8865_DCDC2_CTRL      0x32
 78 #define ACT8865_DCDC3_VSET1     0x40
 79 #define ACT8865_DCDC3_VSET2     0x41
 80 #define ACT8865_DCDC3_CTRL      0x42
 81 #define ACT8865_LDO1_VSET       0x50
 82 #define ACT8865_LDO1_CTRL       0x51
 83 #define ACT8865_LDO2_VSET       0x54
 84 #define ACT8865_LDO2_CTRL       0x55
 85 #define ACT8865_LDO3_VSET       0x60
 86 #define ACT8865_LDO3_CTRL       0x61
 87 #define ACT8865_LDO4_VSET       0x64
 88 #define ACT8865_LDO4_CTRL       0x65
 89 #define ACT8865_MSTROFF         0x20
 90 
 91 /*
 92  * Field Definitions.
 93  */
 94 #define ACT8865_ENA             0x80    /* ON - [7] */
 95 #define ACT8865_VSEL_MASK       0x3F    /* VSET - [5:0] */
 96 
 97 /*
 98  * ACT8865 voltage number
 99  */
100 #define ACT8865_VOLTAGE_NUM     64
101 
102 struct act8865 {
103         struct regmap *regmap;
104         int off_reg;
105         int off_mask;
106 };
107 
108 static const struct regmap_config act8865_regmap_config = {
109         .reg_bits = 8,
110         .val_bits = 8,
111 };
112 
113 static const struct regulator_linear_range act8865_voltage_ranges[] = {
114         REGULATOR_LINEAR_RANGE(600000, 0, 23, 25000),
115         REGULATOR_LINEAR_RANGE(1200000, 24, 47, 50000),
116         REGULATOR_LINEAR_RANGE(2400000, 48, 63, 100000),
117 };
118 
119 static struct regulator_ops act8865_ops = {
120         .list_voltage           = regulator_list_voltage_linear_range,
121         .map_voltage            = regulator_map_voltage_linear_range,
122         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
123         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
124         .enable                 = regulator_enable_regmap,
125         .disable                = regulator_disable_regmap,
126         .is_enabled             = regulator_is_enabled_regmap,
127 };
128 
129 #define ACT88xx_REG(_name, _family, _id, _vsel_reg)                     \
130         [_family##_ID_##_id] = {                                        \
131                 .name                   = _name,                        \
132                 .id                     = _family##_ID_##_id,           \
133                 .type                   = REGULATOR_VOLTAGE,            \
134                 .ops                    = &act8865_ops,                 \
135                 .n_voltages             = ACT8865_VOLTAGE_NUM,          \
136                 .linear_ranges          = act8865_voltage_ranges,       \
137                 .n_linear_ranges        = ARRAY_SIZE(act8865_voltage_ranges), \
138                 .vsel_reg               = _family##_##_id##_##_vsel_reg, \
139                 .vsel_mask              = ACT8865_VSEL_MASK,            \
140                 .enable_reg             = _family##_##_id##_CTRL,       \
141                 .enable_mask            = ACT8865_ENA,                  \
142                 .owner                  = THIS_MODULE,                  \
143         }
144 
145 static const struct regulator_desc act8846_regulators[] = {
146         ACT88xx_REG("REG1", ACT8846, REG1, VSET),
147         ACT88xx_REG("REG2", ACT8846, REG2, VSET0),
148         ACT88xx_REG("REG3", ACT8846, REG3, VSET0),
149         ACT88xx_REG("REG4", ACT8846, REG4, VSET0),
150         ACT88xx_REG("REG5", ACT8846, REG5, VSET),
151         ACT88xx_REG("REG6", ACT8846, REG6, VSET),
152         ACT88xx_REG("REG7", ACT8846, REG7, VSET),
153         ACT88xx_REG("REG8", ACT8846, REG8, VSET),
154         ACT88xx_REG("REG9", ACT8846, REG9, VSET),
155         ACT88xx_REG("REG10", ACT8846, REG10, VSET),
156         ACT88xx_REG("REG11", ACT8846, REG11, VSET),
157         ACT88xx_REG("REG12", ACT8846, REG12, VSET),
158 };
159 
160 static const struct regulator_desc act8865_regulators[] = {
161         ACT88xx_REG("DCDC_REG1", ACT8865, DCDC1, VSET1),
162         ACT88xx_REG("DCDC_REG2", ACT8865, DCDC2, VSET1),
163         ACT88xx_REG("DCDC_REG3", ACT8865, DCDC3, VSET1),
164         ACT88xx_REG("LDO_REG1", ACT8865, LDO1, VSET),
165         ACT88xx_REG("LDO_REG2", ACT8865, LDO2, VSET),
166         ACT88xx_REG("LDO_REG3", ACT8865, LDO3, VSET),
167         ACT88xx_REG("LDO_REG4", ACT8865, LDO4, VSET),
168 };
169 
170 #ifdef CONFIG_OF
171 static const struct of_device_id act8865_dt_ids[] = {
172         { .compatible = "active-semi,act8846", .data = (void *)ACT8846 },
173         { .compatible = "active-semi,act8865", .data = (void *)ACT8865 },
174         { }
175 };
176 MODULE_DEVICE_TABLE(of, act8865_dt_ids);
177 
178 static struct of_regulator_match act8846_matches[] = {
179         [ACT8846_ID_REG1]       = { .name = "REG1" },
180         [ACT8846_ID_REG2]       = { .name = "REG2" },
181         [ACT8846_ID_REG3]       = { .name = "REG3" },
182         [ACT8846_ID_REG4]       = { .name = "REG4" },
183         [ACT8846_ID_REG5]       = { .name = "REG5" },
184         [ACT8846_ID_REG6]       = { .name = "REG6" },
185         [ACT8846_ID_REG7]       = { .name = "REG7" },
186         [ACT8846_ID_REG8]       = { .name = "REG8" },
187         [ACT8846_ID_REG9]       = { .name = "REG9" },
188         [ACT8846_ID_REG10]      = { .name = "REG10" },
189         [ACT8846_ID_REG11]      = { .name = "REG11" },
190         [ACT8846_ID_REG12]      = { .name = "REG12" },
191 };
192 
193 static struct of_regulator_match act8865_matches[] = {
194         [ACT8865_ID_DCDC1]      = { .name = "DCDC_REG1"},
195         [ACT8865_ID_DCDC2]      = { .name = "DCDC_REG2"},
196         [ACT8865_ID_DCDC3]      = { .name = "DCDC_REG3"},
197         [ACT8865_ID_LDO1]       = { .name = "LDO_REG1"},
198         [ACT8865_ID_LDO2]       = { .name = "LDO_REG2"},
199         [ACT8865_ID_LDO3]       = { .name = "LDO_REG3"},
200         [ACT8865_ID_LDO4]       = { .name = "LDO_REG4"},
201 };
202 
203 static int act8865_pdata_from_dt(struct device *dev,
204                                  struct device_node **of_node,
205                                  struct act8865_platform_data *pdata,
206                                  unsigned long type)
207 {
208         int matched, i, num_matches;
209         struct device_node *np;
210         struct act8865_regulator_data *regulator;
211         struct of_regulator_match *matches;
212 
213         np = of_get_child_by_name(dev->of_node, "regulators");
214         if (!np) {
215                 dev_err(dev, "missing 'regulators' subnode in DT\n");
216                 return -EINVAL;
217         }
218 
219         switch (type) {
220         case ACT8846:
221                 matches = act8846_matches;
222                 num_matches = ARRAY_SIZE(act8846_matches);
223                 break;
224         case ACT8865:
225                 matches = act8865_matches;
226                 num_matches = ARRAY_SIZE(act8865_matches);
227                 break;
228         default:
229                 dev_err(dev, "invalid device id %lu\n", type);
230                 return -EINVAL;
231         }
232 
233         matched = of_regulator_match(dev, np, matches, num_matches);
234         of_node_put(np);
235         if (matched <= 0)
236                 return matched;
237 
238         pdata->regulators = devm_kzalloc(dev,
239                                          sizeof(struct act8865_regulator_data) *
240                                          num_matches, GFP_KERNEL);
241         if (!pdata->regulators)
242                 return -ENOMEM;
243 
244         pdata->num_regulators = num_matches;
245         regulator = pdata->regulators;
246 
247         for (i = 0; i < num_matches; i++) {
248                 regulator->id = i;
249                 regulator->name = matches[i].name;
250                 regulator->platform_data = matches[i].init_data;
251                 of_node[i] = matches[i].of_node;
252                 regulator++;
253         }
254 
255         return 0;
256 }
257 #else
258 static inline int act8865_pdata_from_dt(struct device *dev,
259                                         struct device_node **of_node,
260                                         struct act8865_platform_data *pdata,
261                                         unsigned long type)
262 {
263         return 0;
264 }
265 #endif
266 
267 static struct regulator_init_data
268 *act8865_get_init_data(int id, struct act8865_platform_data *pdata)
269 {
270         int i;
271 
272         if (!pdata)
273                 return NULL;
274 
275         for (i = 0; i < pdata->num_regulators; i++) {
276                 if (pdata->regulators[i].id == id)
277                         return pdata->regulators[i].platform_data;
278         }
279 
280         return NULL;
281 }
282 
283 static struct i2c_client *act8865_i2c_client;
284 static void act8865_power_off(void)
285 {
286         struct act8865 *act8865;
287 
288         act8865 = i2c_get_clientdata(act8865_i2c_client);
289         regmap_write(act8865->regmap, act8865->off_reg, act8865->off_mask);
290         while (1);
291 }
292 
293 static int act8865_pmic_probe(struct i2c_client *client,
294                               const struct i2c_device_id *i2c_id)
295 {
296         static const struct regulator_desc *regulators;
297         struct act8865_platform_data pdata_of, *pdata;
298         struct device *dev = &client->dev;
299         struct device_node **of_node;
300         int i, ret, num_regulators;
301         struct act8865 *act8865;
302         unsigned long type;
303         int off_reg, off_mask;
304 
305         pdata = dev_get_platdata(dev);
306 
307         if (dev->of_node && !pdata) {
308                 const struct of_device_id *id;
309 
310                 id = of_match_device(of_match_ptr(act8865_dt_ids), dev);
311                 if (!id)
312                         return -ENODEV;
313 
314                 type = (unsigned long) id->data;
315         } else {
316                 type = i2c_id->driver_data;
317         }
318 
319         switch (type) {
320         case ACT8846:
321                 regulators = act8846_regulators;
322                 num_regulators = ARRAY_SIZE(act8846_regulators);
323                 off_reg = ACT8846_GLB_OFF_CTRL;
324                 off_mask = ACT8846_OFF_SYSMASK;
325                 break;
326         case ACT8865:
327                 regulators = act8865_regulators;
328                 num_regulators = ARRAY_SIZE(act8865_regulators);
329                 off_reg = ACT8865_SYS_CTRL;
330                 off_mask = ACT8865_MSTROFF;
331                 break;
332         default:
333                 dev_err(dev, "invalid device id %lu\n", type);
334                 return -EINVAL;
335         }
336 
337         of_node = devm_kzalloc(dev, sizeof(struct device_node *) *
338                                num_regulators, GFP_KERNEL);
339         if (!of_node)
340                 return -ENOMEM;
341 
342         if (dev->of_node && !pdata) {
343                 ret = act8865_pdata_from_dt(dev, of_node, &pdata_of, type);
344                 if (ret < 0)
345                         return ret;
346 
347                 pdata = &pdata_of;
348         }
349 
350         if (pdata->num_regulators > num_regulators) {
351                 dev_err(dev, "too many regulators: %d\n",
352                         pdata->num_regulators);
353                 return -EINVAL;
354         }
355 
356         act8865 = devm_kzalloc(dev, sizeof(struct act8865), GFP_KERNEL);
357         if (!act8865)
358                 return -ENOMEM;
359 
360         act8865->regmap = devm_regmap_init_i2c(client, &act8865_regmap_config);
361         if (IS_ERR(act8865->regmap)) {
362                 ret = PTR_ERR(act8865->regmap);
363                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
364                         ret);
365                 return ret;
366         }
367 
368         if (of_device_is_system_power_controller(dev->of_node)) {
369                 if (!pm_power_off) {
370                         act8865_i2c_client = client;
371                         act8865->off_reg = off_reg;
372                         act8865->off_mask = off_mask;
373                         pm_power_off = act8865_power_off;
374                 } else {
375                         dev_err(dev, "Failed to set poweroff capability, already defined\n");
376                 }
377         }
378 
379         /* Finally register devices */
380         for (i = 0; i < num_regulators; i++) {
381                 const struct regulator_desc *desc = &regulators[i];
382                 struct regulator_config config = { };
383                 struct regulator_dev *rdev;
384 
385                 config.dev = dev;
386                 config.init_data = act8865_get_init_data(desc->id, pdata);
387                 config.of_node = of_node[i];
388                 config.driver_data = act8865;
389                 config.regmap = act8865->regmap;
390 
391                 rdev = devm_regulator_register(&client->dev, desc, &config);
392                 if (IS_ERR(rdev)) {
393                         dev_err(dev, "failed to register %s\n", desc->name);
394                         return PTR_ERR(rdev);
395                 }
396         }
397 
398         i2c_set_clientdata(client, act8865);
399         devm_kfree(dev, of_node);
400 
401         return 0;
402 }
403 
404 static const struct i2c_device_id act8865_ids[] = {
405         { .name = "act8846", .driver_data = ACT8846 },
406         { .name = "act8865", .driver_data = ACT8865 },
407         { },
408 };
409 MODULE_DEVICE_TABLE(i2c, act8865_ids);
410 
411 static struct i2c_driver act8865_pmic_driver = {
412         .driver = {
413                 .name   = "act8865",
414                 .owner  = THIS_MODULE,
415         },
416         .probe          = act8865_pmic_probe,
417         .id_table       = act8865_ids,
418 };
419 
420 module_i2c_driver(act8865_pmic_driver);
421 
422 MODULE_DESCRIPTION("active-semi act88xx voltage regulator driver");
423 MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
424 MODULE_LICENSE("GPL v2");
425 

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