1/*
  2 * reg-virtual-consumer.c
  3 *
  4 * Copyright 2008 Wolfson Microelectronics PLC.
  5 *
  6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  7 *
  8 * This program is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU General Public License as
 10 * published by the Free Software Foundation; either version 2 of the
 11 * License, or (at your option) any later version.
 12 */
 13
 14#include <linux/err.h>
 15#include <linux/mutex.h>
 16#include <linux/platform_device.h>
 17#include <linux/regulator/consumer.h>
 18#include <linux/slab.h>
 
 19
 20struct virtual_consumer_data {
 21	struct mutex lock;
 22	struct regulator *regulator;
 23	bool enabled;
 24	int min_uV;
 25	int max_uV;
 26	int min_uA;
 27	int max_uA;
 28	unsigned int mode;
 29};
 30
 31static void update_voltage_constraints(struct device *dev,
 32				       struct virtual_consumer_data *data)
 33{
 34	int ret;
 35
 36	if (data->min_uV && data->max_uV
 37	    && data->min_uV <= data->max_uV) {
 38		dev_dbg(dev, "Requesting %d-%duV\n",
 39			data->min_uV, data->max_uV);
 40		ret = regulator_set_voltage(data->regulator,
 41					data->min_uV, data->max_uV);
 42		if (ret != 0) {
 43			dev_err(dev,
 44				"regulator_set_voltage() failed: %d\n", ret);
 45			return;
 46		}
 47	}
 48
 49	if (data->min_uV && data->max_uV && !data->enabled) {
 50		dev_dbg(dev, "Enabling regulator\n");
 51		ret = regulator_enable(data->regulator);
 52		if (ret == 0)
 53			data->enabled = true;
 54		else
 55			dev_err(dev, "regulator_enable() failed: %d\n",
 56				ret);
 57	}
 58
 59	if (!(data->min_uV && data->max_uV) && data->enabled) {
 60		dev_dbg(dev, "Disabling regulator\n");
 61		ret = regulator_disable(data->regulator);
 62		if (ret == 0)
 63			data->enabled = false;
 64		else
 65			dev_err(dev, "regulator_disable() failed: %d\n",
 66				ret);
 67	}
 68}
 69
 70static void update_current_limit_constraints(struct device *dev,
 71					  struct virtual_consumer_data *data)
 72{
 73	int ret;
 74
 75	if (data->max_uA
 76	    && data->min_uA <= data->max_uA) {
 77		dev_dbg(dev, "Requesting %d-%duA\n",
 78			data->min_uA, data->max_uA);
 79		ret = regulator_set_current_limit(data->regulator,
 80					data->min_uA, data->max_uA);
 81		if (ret != 0) {
 82			dev_err(dev,
 83				"regulator_set_current_limit() failed: %d\n",
 84				ret);
 85			return;
 86		}
 87	}
 88
 89	if (data->max_uA && !data->enabled) {
 90		dev_dbg(dev, "Enabling regulator\n");
 91		ret = regulator_enable(data->regulator);
 92		if (ret == 0)
 93			data->enabled = true;
 94		else
 95			dev_err(dev, "regulator_enable() failed: %d\n",
 96				ret);
 97	}
 98
 99	if (!(data->min_uA && data->max_uA) && data->enabled) {
100		dev_dbg(dev, "Disabling regulator\n");
101		ret = regulator_disable(data->regulator);
102		if (ret == 0)
103			data->enabled = false;
104		else
105			dev_err(dev, "regulator_disable() failed: %d\n",
106				ret);
107	}
108}
109
110static ssize_t show_min_uV(struct device *dev,
111			   struct device_attribute *attr, char *buf)
112{
113	struct virtual_consumer_data *data = dev_get_drvdata(dev);
114	return sprintf(buf, "%d\n", data->min_uV);
115}
116
117static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
118			  const char *buf, size_t count)
119{
120	struct virtual_consumer_data *data = dev_get_drvdata(dev);
121	long val;
122
123	if (strict_strtol(buf, 10, &val) != 0)
124		return count;
125
126	mutex_lock(&data->lock);
127
128	data->min_uV = val;
129	update_voltage_constraints(dev, data);
130
131	mutex_unlock(&data->lock);
132
133	return count;
134}
135
136static ssize_t show_max_uV(struct device *dev,
137			   struct device_attribute *attr, char *buf)
138{
139	struct virtual_consumer_data *data = dev_get_drvdata(dev);
140	return sprintf(buf, "%d\n", data->max_uV);
141}
142
143static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
144			  const char *buf, size_t count)
145{
146	struct virtual_consumer_data *data = dev_get_drvdata(dev);
147	long val;
148
149	if (strict_strtol(buf, 10, &val) != 0)
150		return count;
151
152	mutex_lock(&data->lock);
153
154	data->max_uV = val;
155	update_voltage_constraints(dev, data);
156
157	mutex_unlock(&data->lock);
158
159	return count;
160}
161
162static ssize_t show_min_uA(struct device *dev,
163			   struct device_attribute *attr, char *buf)
164{
165	struct virtual_consumer_data *data = dev_get_drvdata(dev);
166	return sprintf(buf, "%d\n", data->min_uA);
167}
168
169static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
170			  const char *buf, size_t count)
171{
172	struct virtual_consumer_data *data = dev_get_drvdata(dev);
173	long val;
174
175	if (strict_strtol(buf, 10, &val) != 0)
176		return count;
177
178	mutex_lock(&data->lock);
179
180	data->min_uA = val;
181	update_current_limit_constraints(dev, data);
182
183	mutex_unlock(&data->lock);
184
185	return count;
186}
187
188static ssize_t show_max_uA(struct device *dev,
189			   struct device_attribute *attr, char *buf)
190{
191	struct virtual_consumer_data *data = dev_get_drvdata(dev);
192	return sprintf(buf, "%d\n", data->max_uA);
193}
194
195static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
196			  const char *buf, size_t count)
197{
198	struct virtual_consumer_data *data = dev_get_drvdata(dev);
199	long val;
200
201	if (strict_strtol(buf, 10, &val) != 0)
202		return count;
203
204	mutex_lock(&data->lock);
205
206	data->max_uA = val;
207	update_current_limit_constraints(dev, data);
208
209	mutex_unlock(&data->lock);
210
211	return count;
212}
213
214static ssize_t show_mode(struct device *dev,
215			 struct device_attribute *attr, char *buf)
216{
217	struct virtual_consumer_data *data = dev_get_drvdata(dev);
218
219	switch (data->mode) {
220	case REGULATOR_MODE_FAST:
221		return sprintf(buf, "fast\n");
222	case REGULATOR_MODE_NORMAL:
223		return sprintf(buf, "normal\n");
224	case REGULATOR_MODE_IDLE:
225		return sprintf(buf, "idle\n");
226	case REGULATOR_MODE_STANDBY:
227		return sprintf(buf, "standby\n");
228	default:
229		return sprintf(buf, "unknown\n");
230	}
231}
232
233static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
234			const char *buf, size_t count)
235{
236	struct virtual_consumer_data *data = dev_get_drvdata(dev);
237	unsigned int mode;
238	int ret;
239
240	/*
241	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
242	 * will be shared with show_mode(), above.
243	 */
244	if (sysfs_streq(buf, "fast\n"))
245		mode = REGULATOR_MODE_FAST;
246	else if (sysfs_streq(buf, "normal\n"))
247		mode = REGULATOR_MODE_NORMAL;
248	else if (sysfs_streq(buf, "idle\n"))
249		mode = REGULATOR_MODE_IDLE;
250	else if (sysfs_streq(buf, "standby\n"))
251		mode = REGULATOR_MODE_STANDBY;
252	else {
253		dev_err(dev, "Configuring invalid mode\n");
254		return count;
255	}
256
257	mutex_lock(&data->lock);
258	ret = regulator_set_mode(data->regulator, mode);
259	if (ret == 0)
260		data->mode = mode;
261	else
262		dev_err(dev, "Failed to configure mode: %d\n", ret);
263	mutex_unlock(&data->lock);
264
265	return count;
266}
267
268static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
269static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
270static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
271static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
272static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
273
274static struct attribute *regulator_virtual_attributes[] = {
275	&dev_attr_min_microvolts.attr,
276	&dev_attr_max_microvolts.attr,
277	&dev_attr_min_microamps.attr,
278	&dev_attr_max_microamps.attr,
279	&dev_attr_mode.attr,
280	NULL
281};
282
283static const struct attribute_group regulator_virtual_attr_group = {
284	.attrs	= regulator_virtual_attributes,
285};
286
287static int __devinit regulator_virtual_probe(struct platform_device *pdev)
288{
289	char *reg_id = pdev->dev.platform_data;
290	struct virtual_consumer_data *drvdata;
291	int ret;
292
293	drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
 
294	if (drvdata == NULL)
295		return -ENOMEM;
296
297	mutex_init(&drvdata->lock);
298
299	drvdata->regulator = regulator_get(&pdev->dev, reg_id);
300	if (IS_ERR(drvdata->regulator)) {
301		ret = PTR_ERR(drvdata->regulator);
302		dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n",
303			reg_id, ret);
304		goto err;
305	}
306
307	ret = sysfs_create_group(&pdev->dev.kobj,
308				 &regulator_virtual_attr_group);
309	if (ret != 0) {
310		dev_err(&pdev->dev,
311			"Failed to create attribute group: %d\n", ret);
312		goto err_regulator;
313	}
314
315	drvdata->mode = regulator_get_mode(drvdata->regulator);
316
317	platform_set_drvdata(pdev, drvdata);
318
319	return 0;
320
321err_regulator:
322	regulator_put(drvdata->regulator);
323err:
324	kfree(drvdata);
325	return ret;
326}
327
328static int __devexit regulator_virtual_remove(struct platform_device *pdev)
329{
330	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
331
332	sysfs_remove_group(&pdev->dev.kobj, &regulator_virtual_attr_group);
333
334	if (drvdata->enabled)
335		regulator_disable(drvdata->regulator);
336	regulator_put(drvdata->regulator);
337
338	kfree(drvdata);
339
340	platform_set_drvdata(pdev, NULL);
341
342	return 0;
343}
344
345static struct platform_driver regulator_virtual_consumer_driver = {
346	.probe		= regulator_virtual_probe,
347	.remove		= __devexit_p(regulator_virtual_remove),
348	.driver		= {
349		.name		= "reg-virt-consumer",
350		.owner		= THIS_MODULE,
351	},
352};
353
354static int __init regulator_virtual_consumer_init(void)
355{
356	return platform_driver_register(&regulator_virtual_consumer_driver);
357}
358module_init(regulator_virtual_consumer_init);
359
360static void __exit regulator_virtual_consumer_exit(void)
361{
362	platform_driver_unregister(&regulator_virtual_consumer_driver);
363}
364module_exit(regulator_virtual_consumer_exit);
365
366MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
367MODULE_DESCRIPTION("Virtual regulator consumer");
368MODULE_LICENSE("GPL");
369MODULE_ALIAS("platform:reg-virt-consumer");

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * reg-virtual-consumer.c
  4 *
  5 * Copyright 2008 Wolfson Microelectronics PLC.
  6 *
  7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 
 
 
 
 
  8 */
  9
 10#include <linux/err.h>
 11#include <linux/mutex.h>
 12#include <linux/platform_device.h>
 13#include <linux/regulator/consumer.h>
 14#include <linux/slab.h>
 15#include <linux/module.h>
 16
 17struct virtual_consumer_data {
 18	struct mutex lock;
 19	struct regulator *regulator;
 20	bool enabled;
 21	int min_uV;
 22	int max_uV;
 23	int min_uA;
 24	int max_uA;
 25	unsigned int mode;
 26};
 27
 28static void update_voltage_constraints(struct device *dev,
 29				       struct virtual_consumer_data *data)
 30{
 31	int ret;
 32
 33	if (data->min_uV && data->max_uV
 34	    && data->min_uV <= data->max_uV) {
 35		dev_dbg(dev, "Requesting %d-%duV\n",
 36			data->min_uV, data->max_uV);
 37		ret = regulator_set_voltage(data->regulator,
 38					data->min_uV, data->max_uV);
 39		if (ret != 0) {
 40			dev_err(dev,
 41				"regulator_set_voltage() failed: %d\n", ret);
 42			return;
 43		}
 44	}
 45
 46	if (data->min_uV && data->max_uV && !data->enabled) {
 47		dev_dbg(dev, "Enabling regulator\n");
 48		ret = regulator_enable(data->regulator);
 49		if (ret == 0)
 50			data->enabled = true;
 51		else
 52			dev_err(dev, "regulator_enable() failed: %d\n",
 53				ret);
 54	}
 55
 56	if (!(data->min_uV && data->max_uV) && data->enabled) {
 57		dev_dbg(dev, "Disabling regulator\n");
 58		ret = regulator_disable(data->regulator);
 59		if (ret == 0)
 60			data->enabled = false;
 61		else
 62			dev_err(dev, "regulator_disable() failed: %d\n",
 63				ret);
 64	}
 65}
 66
 67static void update_current_limit_constraints(struct device *dev,
 68					  struct virtual_consumer_data *data)
 69{
 70	int ret;
 71
 72	if (data->max_uA
 73	    && data->min_uA <= data->max_uA) {
 74		dev_dbg(dev, "Requesting %d-%duA\n",
 75			data->min_uA, data->max_uA);
 76		ret = regulator_set_current_limit(data->regulator,
 77					data->min_uA, data->max_uA);
 78		if (ret != 0) {
 79			dev_err(dev,
 80				"regulator_set_current_limit() failed: %d\n",
 81				ret);
 82			return;
 83		}
 84	}
 85
 86	if (data->max_uA && !data->enabled) {
 87		dev_dbg(dev, "Enabling regulator\n");
 88		ret = regulator_enable(data->regulator);
 89		if (ret == 0)
 90			data->enabled = true;
 91		else
 92			dev_err(dev, "regulator_enable() failed: %d\n",
 93				ret);
 94	}
 95
 96	if (!(data->min_uA && data->max_uA) && data->enabled) {
 97		dev_dbg(dev, "Disabling regulator\n");
 98		ret = regulator_disable(data->regulator);
 99		if (ret == 0)
100			data->enabled = false;
101		else
102			dev_err(dev, "regulator_disable() failed: %d\n",
103				ret);
104	}
105}
106
107static ssize_t show_min_uV(struct device *dev,
108			   struct device_attribute *attr, char *buf)
109{
110	struct virtual_consumer_data *data = dev_get_drvdata(dev);
111	return sprintf(buf, "%d\n", data->min_uV);
112}
113
114static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
115			  const char *buf, size_t count)
116{
117	struct virtual_consumer_data *data = dev_get_drvdata(dev);
118	long val;
119
120	if (kstrtol(buf, 10, &val) != 0)
121		return count;
122
123	mutex_lock(&data->lock);
124
125	data->min_uV = val;
126	update_voltage_constraints(dev, data);
127
128	mutex_unlock(&data->lock);
129
130	return count;
131}
132
133static ssize_t show_max_uV(struct device *dev,
134			   struct device_attribute *attr, char *buf)
135{
136	struct virtual_consumer_data *data = dev_get_drvdata(dev);
137	return sprintf(buf, "%d\n", data->max_uV);
138}
139
140static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
141			  const char *buf, size_t count)
142{
143	struct virtual_consumer_data *data = dev_get_drvdata(dev);
144	long val;
145
146	if (kstrtol(buf, 10, &val) != 0)
147		return count;
148
149	mutex_lock(&data->lock);
150
151	data->max_uV = val;
152	update_voltage_constraints(dev, data);
153
154	mutex_unlock(&data->lock);
155
156	return count;
157}
158
159static ssize_t show_min_uA(struct device *dev,
160			   struct device_attribute *attr, char *buf)
161{
162	struct virtual_consumer_data *data = dev_get_drvdata(dev);
163	return sprintf(buf, "%d\n", data->min_uA);
164}
165
166static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
167			  const char *buf, size_t count)
168{
169	struct virtual_consumer_data *data = dev_get_drvdata(dev);
170	long val;
171
172	if (kstrtol(buf, 10, &val) != 0)
173		return count;
174
175	mutex_lock(&data->lock);
176
177	data->min_uA = val;
178	update_current_limit_constraints(dev, data);
179
180	mutex_unlock(&data->lock);
181
182	return count;
183}
184
185static ssize_t show_max_uA(struct device *dev,
186			   struct device_attribute *attr, char *buf)
187{
188	struct virtual_consumer_data *data = dev_get_drvdata(dev);
189	return sprintf(buf, "%d\n", data->max_uA);
190}
191
192static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
193			  const char *buf, size_t count)
194{
195	struct virtual_consumer_data *data = dev_get_drvdata(dev);
196	long val;
197
198	if (kstrtol(buf, 10, &val) != 0)
199		return count;
200
201	mutex_lock(&data->lock);
202
203	data->max_uA = val;
204	update_current_limit_constraints(dev, data);
205
206	mutex_unlock(&data->lock);
207
208	return count;
209}
210
211static ssize_t show_mode(struct device *dev,
212			 struct device_attribute *attr, char *buf)
213{
214	struct virtual_consumer_data *data = dev_get_drvdata(dev);
215
216	switch (data->mode) {
217	case REGULATOR_MODE_FAST:
218		return sprintf(buf, "fast\n");
219	case REGULATOR_MODE_NORMAL:
220		return sprintf(buf, "normal\n");
221	case REGULATOR_MODE_IDLE:
222		return sprintf(buf, "idle\n");
223	case REGULATOR_MODE_STANDBY:
224		return sprintf(buf, "standby\n");
225	default:
226		return sprintf(buf, "unknown\n");
227	}
228}
229
230static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
231			const char *buf, size_t count)
232{
233	struct virtual_consumer_data *data = dev_get_drvdata(dev);
234	unsigned int mode;
235	int ret;
236
237	/*
238	 * sysfs_streq() doesn't need the \n's, but we add them so the strings
239	 * will be shared with show_mode(), above.
240	 */
241	if (sysfs_streq(buf, "fast\n"))
242		mode = REGULATOR_MODE_FAST;
243	else if (sysfs_streq(buf, "normal\n"))
244		mode = REGULATOR_MODE_NORMAL;
245	else if (sysfs_streq(buf, "idle\n"))
246		mode = REGULATOR_MODE_IDLE;
247	else if (sysfs_streq(buf, "standby\n"))
248		mode = REGULATOR_MODE_STANDBY;
249	else {
250		dev_err(dev, "Configuring invalid mode\n");
251		return count;
252	}
253
254	mutex_lock(&data->lock);
255	ret = regulator_set_mode(data->regulator, mode);
256	if (ret == 0)
257		data->mode = mode;
258	else
259		dev_err(dev, "Failed to configure mode: %d\n", ret);
260	mutex_unlock(&data->lock);
261
262	return count;
263}
264
265static DEVICE_ATTR(min_microvolts, 0664, show_min_uV, set_min_uV);
266static DEVICE_ATTR(max_microvolts, 0664, show_max_uV, set_max_uV);
267static DEVICE_ATTR(min_microamps, 0664, show_min_uA, set_min_uA);
268static DEVICE_ATTR(max_microamps, 0664, show_max_uA, set_max_uA);
269static DEVICE_ATTR(mode, 0664, show_mode, set_mode);
270
271static struct attribute *regulator_virtual_attributes[] = {
272	&dev_attr_min_microvolts.attr,
273	&dev_attr_max_microvolts.attr,
274	&dev_attr_min_microamps.attr,
275	&dev_attr_max_microamps.attr,
276	&dev_attr_mode.attr,
277	NULL
278};
279
280static const struct attribute_group regulator_virtual_attr_group = {
281	.attrs	= regulator_virtual_attributes,
282};
283
284static int regulator_virtual_probe(struct platform_device *pdev)
285{
286	char *reg_id = dev_get_platdata(&pdev->dev);
287	struct virtual_consumer_data *drvdata;
288	int ret;
289
290	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct virtual_consumer_data),
291			       GFP_KERNEL);
292	if (drvdata == NULL)
293		return -ENOMEM;
294
295	mutex_init(&drvdata->lock);
296
297	drvdata->regulator = devm_regulator_get(&pdev->dev, reg_id);
298	if (IS_ERR(drvdata->regulator)) {
299		ret = PTR_ERR(drvdata->regulator);
300		dev_err(&pdev->dev, "Failed to obtain supply '%s': %d\n",
301			reg_id, ret);
302		return ret;
303	}
304
305	ret = sysfs_create_group(&pdev->dev.kobj,
306				 &regulator_virtual_attr_group);
307	if (ret != 0) {
308		dev_err(&pdev->dev,
309			"Failed to create attribute group: %d\n", ret);
310		return ret;
311	}
312
313	drvdata->mode = regulator_get_mode(drvdata->regulator);
314
315	platform_set_drvdata(pdev, drvdata);
316
317	return 0;
 
 
 
 
 
 
318}
319
320static int regulator_virtual_remove(struct platform_device *pdev)
321{
322	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
323
324	sysfs_remove_group(&pdev->dev.kobj, &regulator_virtual_attr_group);
325
326	if (drvdata->enabled)
327		regulator_disable(drvdata->regulator);
 
 
 
 
 
328
329	return 0;
330}
331
332static struct platform_driver regulator_virtual_consumer_driver = {
333	.probe		= regulator_virtual_probe,
334	.remove		= regulator_virtual_remove,
335	.driver		= {
336		.name		= "reg-virt-consumer",
 
337	},
338};
339
340module_platform_driver(regulator_virtual_consumer_driver);
 
 
 
 
 
 
 
 
 
 
341
342MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
343MODULE_DESCRIPTION("Virtual regulator consumer");
344MODULE_LICENSE("GPL");
345MODULE_ALIAS("platform:reg-virt-consumer");