1 /*
2  * Copyright (C) 2014-2015 Samsung Electronics
3  * Przemyslaw Marczak <p.marczak@samsung.com>
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 
8 #include <common.h>
9 #include <errno.h>
10 #include <dm.h>
11 #include <dm/uclass-internal.h>
12 #include <power/pmic.h>
13 #include <power/regulator.h>
14 
15 DECLARE_GLOBAL_DATA_PTR;
16 
17 int regulator_mode(struct udevice *dev, struct dm_regulator_mode **modep)
18 {
19 	struct dm_regulator_uclass_platdata *uc_pdata;
20 
21 	*modep = NULL;
22 
23 	uc_pdata = dev_get_uclass_platdata(dev);
24 	if (!uc_pdata)
25 		return -ENXIO;
26 
27 	*modep = uc_pdata->mode;
28 	return uc_pdata->mode_count;
29 }
30 
31 int regulator_get_value(struct udevice *dev)
32 {
33 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
34 
35 	if (!ops || !ops->get_value)
36 		return -ENOSYS;
37 
38 	return ops->get_value(dev);
39 }
40 
41 int regulator_set_value(struct udevice *dev, int uV)
42 {
43 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
44 	struct dm_regulator_uclass_platdata *uc_pdata;
45 
46 	uc_pdata = dev_get_uclass_platdata(dev);
47 	if (uc_pdata->min_uV != -ENODATA && uV < uc_pdata->min_uV)
48 		return -EINVAL;
49 	if (uc_pdata->max_uV != -ENODATA && uV > uc_pdata->max_uV)
50 		return -EINVAL;
51 
52 	if (!ops || !ops->set_value)
53 		return -ENOSYS;
54 
55 	return ops->set_value(dev, uV);
56 }
57 
58 /*
59  * To be called with at most caution as there is no check
60  * before setting the actual voltage value.
61  */
62 int regulator_set_value_force(struct udevice *dev, int uV)
63 {
64 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
65 
66 	if (!ops || !ops->set_value)
67 		return -ENOSYS;
68 
69 	return ops->set_value(dev, uV);
70 }
71 
72 int regulator_get_current(struct udevice *dev)
73 {
74 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
75 
76 	if (!ops || !ops->get_current)
77 		return -ENOSYS;
78 
79 	return ops->get_current(dev);
80 }
81 
82 int regulator_set_current(struct udevice *dev, int uA)
83 {
84 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
85 	struct dm_regulator_uclass_platdata *uc_pdata;
86 
87 	uc_pdata = dev_get_uclass_platdata(dev);
88 	if (uc_pdata->min_uA != -ENODATA && uA < uc_pdata->min_uA)
89 		return -EINVAL;
90 	if (uc_pdata->max_uA != -ENODATA && uA > uc_pdata->max_uA)
91 		return -EINVAL;
92 
93 	if (!ops || !ops->set_current)
94 		return -ENOSYS;
95 
96 	return ops->set_current(dev, uA);
97 }
98 
99 bool regulator_get_enable(struct udevice *dev)
100 {
101 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
102 
103 	if (!ops || !ops->get_enable)
104 		return -ENOSYS;
105 
106 	return ops->get_enable(dev);
107 }
108 
109 int regulator_set_enable(struct udevice *dev, bool enable)
110 {
111 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
112 
113 	if (!ops || !ops->set_enable)
114 		return -ENOSYS;
115 
116 	return ops->set_enable(dev, enable);
117 }
118 
119 int regulator_get_mode(struct udevice *dev)
120 {
121 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
122 
123 	if (!ops || !ops->get_mode)
124 		return -ENOSYS;
125 
126 	return ops->get_mode(dev);
127 }
128 
129 int regulator_set_mode(struct udevice *dev, int mode)
130 {
131 	const struct dm_regulator_ops *ops = dev_get_driver_ops(dev);
132 
133 	if (!ops || !ops->set_mode)
134 		return -ENOSYS;
135 
136 	return ops->set_mode(dev, mode);
137 }
138 
139 int regulator_get_by_platname(const char *plat_name, struct udevice **devp)
140 {
141 	struct dm_regulator_uclass_platdata *uc_pdata;
142 	struct udevice *dev;
143 	int ret;
144 
145 	*devp = NULL;
146 
147 	for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
148 	     ret = uclass_find_next_device(&dev)) {
149 		if (ret) {
150 			debug("regulator %s, ret=%d\n", dev->name, ret);
151 			continue;
152 		}
153 
154 		uc_pdata = dev_get_uclass_platdata(dev);
155 		if (!uc_pdata || strcmp(plat_name, uc_pdata->name))
156 			continue;
157 
158 		return uclass_get_device_tail(dev, 0, devp);
159 	}
160 
161 	debug("%s: can't find: %s, ret=%d\n", __func__, plat_name, ret);
162 
163 	return -ENODEV;
164 }
165 
166 int regulator_get_by_devname(const char *devname, struct udevice **devp)
167 {
168 	return uclass_get_device_by_name(UCLASS_REGULATOR, devname, devp);
169 }
170 
171 int device_get_supply_regulator(struct udevice *dev, const char *supply_name,
172 				struct udevice **devp)
173 {
174 	return uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
175 					    supply_name, devp);
176 }
177 
178 int regulator_autoset(struct udevice *dev)
179 {
180 	struct dm_regulator_uclass_platdata *uc_pdata;
181 	int ret = 0;
182 
183 	uc_pdata = dev_get_uclass_platdata(dev);
184 	if (!uc_pdata->always_on && !uc_pdata->boot_on)
185 		return -EMEDIUMTYPE;
186 
187 	if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
188 		ret = regulator_set_value(dev, uc_pdata->min_uV);
189 	if (!ret && (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA))
190 		ret = regulator_set_current(dev, uc_pdata->min_uA);
191 
192 	if (!ret)
193 		ret = regulator_set_enable(dev, true);
194 
195 	return ret;
196 }
197 
198 static void regulator_show(struct udevice *dev, int ret)
199 {
200 	struct dm_regulator_uclass_platdata *uc_pdata;
201 
202 	uc_pdata = dev_get_uclass_platdata(dev);
203 
204 	printf("%s@%s: ", dev->name, uc_pdata->name);
205 	if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UV)
206 		printf("set %d uV", uc_pdata->min_uV);
207 	if (uc_pdata->flags & REGULATOR_FLAG_AUTOSET_UA)
208 		printf("; set %d uA", uc_pdata->min_uA);
209 	printf("; enabling");
210 	if (ret)
211 		printf(" (ret: %d)", ret);
212 	printf("\n");
213 }
214 
215 int regulator_autoset_by_name(const char *platname, struct udevice **devp)
216 {
217 	struct udevice *dev;
218 	int ret;
219 
220 	ret = regulator_get_by_platname(platname, &dev);
221 	if (devp)
222 		*devp = dev;
223 	if (ret) {
224 		debug("Can get the regulator: %s (err=%d)\n", platname, ret);
225 		return ret;
226 	}
227 
228 	return regulator_autoset(dev);
229 }
230 
231 int regulator_list_autoset(const char *list_platname[],
232 			   struct udevice *list_devp[],
233 			   bool verbose)
234 {
235 	struct udevice *dev;
236 	int error = 0, i = 0, ret;
237 
238 	while (list_platname[i]) {
239 		ret = regulator_autoset_by_name(list_platname[i], &dev);
240 		if (ret != -EMEDIUMTYPE && verbose)
241 			regulator_show(dev, ret);
242 		if (ret & !error)
243 			error = ret;
244 
245 		if (list_devp)
246 			list_devp[i] = dev;
247 
248 		i++;
249 	}
250 
251 	return error;
252 }
253 
254 static bool regulator_name_is_unique(struct udevice *check_dev,
255 				     const char *check_name)
256 {
257 	struct dm_regulator_uclass_platdata *uc_pdata;
258 	struct udevice *dev;
259 	int check_len = strlen(check_name);
260 	int ret;
261 	int len;
262 
263 	for (ret = uclass_find_first_device(UCLASS_REGULATOR, &dev); dev;
264 	     ret = uclass_find_next_device(&dev)) {
265 		if (ret || dev == check_dev)
266 			continue;
267 
268 		uc_pdata = dev_get_uclass_platdata(dev);
269 		len = strlen(uc_pdata->name);
270 		if (len != check_len)
271 			continue;
272 
273 		if (!strcmp(uc_pdata->name, check_name))
274 			return false;
275 	}
276 
277 	return true;
278 }
279 
280 static int regulator_post_bind(struct udevice *dev)
281 {
282 	struct dm_regulator_uclass_platdata *uc_pdata;
283 	const char *property = "regulator-name";
284 
285 	uc_pdata = dev_get_uclass_platdata(dev);
286 
287 	/* Regulator's mandatory constraint */
288 	uc_pdata->name = dev_read_string(dev, property);
289 	if (!uc_pdata->name) {
290 		debug("%s: dev '%s' has no property '%s'\n",
291 		      __func__, dev->name, property);
292 		uc_pdata->name = dev_read_name(dev);
293 		if (!uc_pdata->name)
294 			return -EINVAL;
295 	}
296 
297 	if (regulator_name_is_unique(dev, uc_pdata->name))
298 		return 0;
299 
300 	debug("'%s' of dev: '%s', has nonunique value: '%s\n",
301 	      property, dev->name, uc_pdata->name);
302 
303 	return -EINVAL;
304 }
305 
306 static int regulator_pre_probe(struct udevice *dev)
307 {
308 	struct dm_regulator_uclass_platdata *uc_pdata;
309 
310 	uc_pdata = dev_get_uclass_platdata(dev);
311 	if (!uc_pdata)
312 		return -ENXIO;
313 
314 	/* Regulator's optional constraints */
315 	uc_pdata->min_uV = dev_read_u32_default(dev, "regulator-min-microvolt",
316 						-ENODATA);
317 	uc_pdata->max_uV = dev_read_u32_default(dev, "regulator-max-microvolt",
318 						-ENODATA);
319 	uc_pdata->min_uA = dev_read_u32_default(dev, "regulator-min-microamp",
320 						-ENODATA);
321 	uc_pdata->max_uA = dev_read_u32_default(dev, "regulator-max-microamp",
322 						-ENODATA);
323 	uc_pdata->always_on = dev_read_bool(dev, "regulator-always-on");
324 	uc_pdata->boot_on = dev_read_bool(dev, "regulator-boot-on");
325 
326 	/* Those values are optional (-ENODATA if unset) */
327 	if ((uc_pdata->min_uV != -ENODATA) &&
328 	    (uc_pdata->max_uV != -ENODATA) &&
329 	    (uc_pdata->min_uV == uc_pdata->max_uV))
330 		uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UV;
331 
332 	/* Those values are optional (-ENODATA if unset) */
333 	if ((uc_pdata->min_uA != -ENODATA) &&
334 	    (uc_pdata->max_uA != -ENODATA) &&
335 	    (uc_pdata->min_uA == uc_pdata->max_uA))
336 		uc_pdata->flags |= REGULATOR_FLAG_AUTOSET_UA;
337 
338 	return 0;
339 }
340 
341 int regulators_enable_boot_on(bool verbose)
342 {
343 	struct udevice *dev;
344 	struct uclass *uc;
345 	int ret;
346 
347 	ret = uclass_get(UCLASS_REGULATOR, &uc);
348 	if (ret)
349 		return ret;
350 	for (uclass_first_device(UCLASS_REGULATOR, &dev);
351 	     dev;
352 	     uclass_next_device(&dev)) {
353 		ret = regulator_autoset(dev);
354 		if (ret == -EMEDIUMTYPE) {
355 			ret = 0;
356 			continue;
357 		}
358 		if (verbose)
359 			regulator_show(dev, ret);
360 		if (ret == -ENOSYS)
361 			ret = 0;
362 	}
363 
364 	return ret;
365 }
366 
367 UCLASS_DRIVER(regulator) = {
368 	.id		= UCLASS_REGULATOR,
369 	.name		= "regulator",
370 	.post_bind	= regulator_post_bind,
371 	.pre_probe	= regulator_pre_probe,
372 	.per_device_platdata_auto_alloc_size =
373 				sizeof(struct dm_regulator_uclass_platdata),
374 };
375