Merge remote-tracking branches 'asoc/fix/dpcm', 'asoc/fix/imx', 'asoc/fix/msm8916...
[linux-2.6-microblaze.git] / drivers / regulator / of_regulator.c
1 /*
2  * OF helpers for regulator framework
3  *
4  * Copyright (C) 2011 Texas Instruments, Inc.
5  * Rajendra Nayak <rnayak@ti.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
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/of.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/of_regulator.h>
19
20 #include "internal.h"
21
22 static const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
23         [PM_SUSPEND_MEM]        = "regulator-state-mem",
24         [PM_SUSPEND_MAX]        = "regulator-state-disk",
25 };
26
27 static void of_get_regulation_constraints(struct device_node *np,
28                                         struct regulator_init_data **init_data,
29                                         const struct regulator_desc *desc)
30 {
31         struct regulation_constraints *constraints = &(*init_data)->constraints;
32         struct regulator_state *suspend_state;
33         struct device_node *suspend_np;
34         int ret, i;
35         u32 pval;
36
37         constraints->name = of_get_property(np, "regulator-name", NULL);
38
39         if (!of_property_read_u32(np, "regulator-min-microvolt", &pval))
40                 constraints->min_uV = pval;
41
42         if (!of_property_read_u32(np, "regulator-max-microvolt", &pval))
43                 constraints->max_uV = pval;
44
45         /* Voltage change possible? */
46         if (constraints->min_uV != constraints->max_uV)
47                 constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
48
49         /* Do we have a voltage range, if so try to apply it? */
50         if (constraints->min_uV && constraints->max_uV)
51                 constraints->apply_uV = true;
52
53         if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
54                 constraints->uV_offset = pval;
55         if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
56                 constraints->min_uA = pval;
57         if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
58                 constraints->max_uA = pval;
59
60         if (!of_property_read_u32(np, "regulator-input-current-limit-microamp",
61                                   &pval))
62                 constraints->ilim_uA = pval;
63
64         /* Current change possible? */
65         if (constraints->min_uA != constraints->max_uA)
66                 constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
67
68         constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");
69         constraints->always_on = of_property_read_bool(np, "regulator-always-on");
70         if (!constraints->always_on) /* status change should be possible. */
71                 constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS;
72
73         constraints->pull_down = of_property_read_bool(np, "regulator-pull-down");
74
75         if (of_property_read_bool(np, "regulator-allow-bypass"))
76                 constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
77
78         if (of_property_read_bool(np, "regulator-allow-set-load"))
79                 constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;
80
81         ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
82         if (!ret) {
83                 if (pval)
84                         constraints->ramp_delay = pval;
85                 else
86                         constraints->ramp_disable = true;
87         }
88
89         ret = of_property_read_u32(np, "regulator-settling-time-us", &pval);
90         if (!ret)
91                 constraints->settling_time = pval;
92
93         ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval);
94         if (!ret)
95                 constraints->settling_time_up = pval;
96         if (constraints->settling_time_up && constraints->settling_time) {
97                 pr_warn("%s: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us'\n",
98                         np->name);
99                 constraints->settling_time_up = 0;
100         }
101
102         ret = of_property_read_u32(np, "regulator-settling-time-down-us",
103                                    &pval);
104         if (!ret)
105                 constraints->settling_time_down = pval;
106         if (constraints->settling_time_down && constraints->settling_time) {
107                 pr_warn("%s: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us'\n",
108                         np->name);
109                 constraints->settling_time_down = 0;
110         }
111
112         ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
113         if (!ret)
114                 constraints->enable_time = pval;
115
116         constraints->soft_start = of_property_read_bool(np,
117                                         "regulator-soft-start");
118         ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
119         if (!ret) {
120                 constraints->active_discharge =
121                                 (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
122                                         REGULATOR_ACTIVE_DISCHARGE_DISABLE;
123         }
124
125         if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
126                 if (desc && desc->of_map_mode) {
127                         ret = desc->of_map_mode(pval);
128                         if (ret == -EINVAL)
129                                 pr_err("%s: invalid mode %u\n", np->name, pval);
130                         else
131                                 constraints->initial_mode = ret;
132                 } else {
133                         pr_warn("%s: mapping for mode %d not defined\n",
134                                 np->name, pval);
135                 }
136         }
137
138         if (!of_property_read_u32(np, "regulator-system-load", &pval))
139                 constraints->system_load = pval;
140
141         constraints->over_current_protection = of_property_read_bool(np,
142                                         "regulator-over-current-protection");
143
144         for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
145                 switch (i) {
146                 case PM_SUSPEND_MEM:
147                         suspend_state = &constraints->state_mem;
148                         break;
149                 case PM_SUSPEND_MAX:
150                         suspend_state = &constraints->state_disk;
151                         break;
152                 case PM_SUSPEND_ON:
153                 case PM_SUSPEND_FREEZE:
154                 case PM_SUSPEND_STANDBY:
155                 default:
156                         continue;
157                 }
158
159                 suspend_np = of_get_child_by_name(np, regulator_states[i]);
160                 if (!suspend_np || !suspend_state)
161                         continue;
162
163                 if (!of_property_read_u32(suspend_np, "regulator-mode",
164                                           &pval)) {
165                         if (desc && desc->of_map_mode) {
166                                 ret = desc->of_map_mode(pval);
167                                 if (ret == -EINVAL)
168                                         pr_err("%s: invalid mode %u\n",
169                                                np->name, pval);
170                                 else
171                                         suspend_state->mode = ret;
172                         } else {
173                                 pr_warn("%s: mapping for mode %d not defined\n",
174                                         np->name, pval);
175                         }
176                 }
177
178                 if (of_property_read_bool(suspend_np,
179                                         "regulator-on-in-suspend"))
180                         suspend_state->enabled = true;
181                 else if (of_property_read_bool(suspend_np,
182                                         "regulator-off-in-suspend"))
183                         suspend_state->disabled = true;
184
185                 if (!of_property_read_u32(suspend_np,
186                                         "regulator-suspend-microvolt", &pval))
187                         suspend_state->uV = pval;
188
189                 if (i == PM_SUSPEND_MEM)
190                         constraints->initial_state = PM_SUSPEND_MEM;
191
192                 of_node_put(suspend_np);
193                 suspend_state = NULL;
194                 suspend_np = NULL;
195         }
196 }
197
198 /**
199  * of_get_regulator_init_data - extract regulator_init_data structure info
200  * @dev: device requesting for regulator_init_data
201  * @node: regulator device node
202  * @desc: regulator description
203  *
204  * Populates regulator_init_data structure by extracting data from device
205  * tree node, returns a pointer to the populated struture or NULL if memory
206  * alloc fails.
207  */
208 struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
209                                           struct device_node *node,
210                                           const struct regulator_desc *desc)
211 {
212         struct regulator_init_data *init_data;
213
214         if (!node)
215                 return NULL;
216
217         init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
218         if (!init_data)
219                 return NULL; /* Out of memory? */
220
221         of_get_regulation_constraints(node, &init_data, desc);
222         return init_data;
223 }
224 EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
225
226 struct devm_of_regulator_matches {
227         struct of_regulator_match *matches;
228         unsigned int num_matches;
229 };
230
231 static void devm_of_regulator_put_matches(struct device *dev, void *res)
232 {
233         struct devm_of_regulator_matches *devm_matches = res;
234         int i;
235
236         for (i = 0; i < devm_matches->num_matches; i++)
237                 of_node_put(devm_matches->matches[i].of_node);
238 }
239
240 /**
241  * of_regulator_match - extract multiple regulator init data from device tree.
242  * @dev: device requesting the data
243  * @node: parent device node of the regulators
244  * @matches: match table for the regulators
245  * @num_matches: number of entries in match table
246  *
247  * This function uses a match table specified by the regulator driver to
248  * parse regulator init data from the device tree. @node is expected to
249  * contain a set of child nodes, each providing the init data for one
250  * regulator. The data parsed from a child node will be matched to a regulator
251  * based on either the deprecated property regulator-compatible if present,
252  * or otherwise the child node's name. Note that the match table is modified
253  * in place and an additional of_node reference is taken for each matched
254  * regulator.
255  *
256  * Returns the number of matches found or a negative error code on failure.
257  */
258 int of_regulator_match(struct device *dev, struct device_node *node,
259                        struct of_regulator_match *matches,
260                        unsigned int num_matches)
261 {
262         unsigned int count = 0;
263         unsigned int i;
264         const char *name;
265         struct device_node *child;
266         struct devm_of_regulator_matches *devm_matches;
267
268         if (!dev || !node)
269                 return -EINVAL;
270
271         devm_matches = devres_alloc(devm_of_regulator_put_matches,
272                                     sizeof(struct devm_of_regulator_matches),
273                                     GFP_KERNEL);
274         if (!devm_matches)
275                 return -ENOMEM;
276
277         devm_matches->matches = matches;
278         devm_matches->num_matches = num_matches;
279
280         devres_add(dev, devm_matches);
281
282         for (i = 0; i < num_matches; i++) {
283                 struct of_regulator_match *match = &matches[i];
284                 match->init_data = NULL;
285                 match->of_node = NULL;
286         }
287
288         for_each_child_of_node(node, child) {
289                 name = of_get_property(child,
290                                         "regulator-compatible", NULL);
291                 if (!name)
292                         name = child->name;
293                 for (i = 0; i < num_matches; i++) {
294                         struct of_regulator_match *match = &matches[i];
295                         if (match->of_node)
296                                 continue;
297
298                         if (strcmp(match->name, name))
299                                 continue;
300
301                         match->init_data =
302                                 of_get_regulator_init_data(dev, child,
303                                                            match->desc);
304                         if (!match->init_data) {
305                                 dev_err(dev,
306                                         "failed to parse DT for regulator %s\n",
307                                         child->name);
308                                 return -EINVAL;
309                         }
310                         match->of_node = of_node_get(child);
311                         count++;
312                         break;
313                 }
314         }
315
316         return count;
317 }
318 EXPORT_SYMBOL_GPL(of_regulator_match);
319
320 struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
321                                             const struct regulator_desc *desc,
322                                             struct regulator_config *config,
323                                             struct device_node **node)
324 {
325         struct device_node *search, *child;
326         struct regulator_init_data *init_data = NULL;
327         const char *name;
328
329         if (!dev->of_node || !desc->of_match)
330                 return NULL;
331
332         if (desc->regulators_node)
333                 search = of_get_child_by_name(dev->of_node,
334                                               desc->regulators_node);
335         else
336                 search = dev->of_node;
337
338         if (!search) {
339                 dev_dbg(dev, "Failed to find regulator container node '%s'\n",
340                         desc->regulators_node);
341                 return NULL;
342         }
343
344         for_each_available_child_of_node(search, child) {
345                 name = of_get_property(child, "regulator-compatible", NULL);
346                 if (!name)
347                         name = child->name;
348
349                 if (strcmp(desc->of_match, name))
350                         continue;
351
352                 init_data = of_get_regulator_init_data(dev, child, desc);
353                 if (!init_data) {
354                         dev_err(dev,
355                                 "failed to parse DT for regulator %s\n",
356                                 child->name);
357                         break;
358                 }
359
360                 if (desc->of_parse_cb) {
361                         if (desc->of_parse_cb(child, desc, config)) {
362                                 dev_err(dev,
363                                         "driver callback failed to parse DT for regulator %s\n",
364                                         child->name);
365                                 init_data = NULL;
366                                 break;
367                         }
368                 }
369
370                 of_node_get(child);
371                 *node = child;
372                 break;
373         }
374
375         of_node_put(search);
376
377         return init_data;
378 }