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