[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / regulator / virtual.c

/*
 * reg-virtual-consumer.c
 *
 * Copyright 2008 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 */

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>

struct virtual_consumer_data {
	struct mutex lock;
	struct regulator *regulator;
	int enabled;
	int min_uV;
	int max_uV;
	int min_uA;
	int max_uA;
	unsigned int mode;
};

static void update_voltage_constraints(struct virtual_consumer_data *data)
{
	int ret;

	if (data->min_uV && data->max_uV
	    && data->min_uV <= data->max_uV) {
		ret = regulator_set_voltage(data->regulator,
					    data->min_uV, data->max_uV);
		if (ret != 0) {
			printk(KERN_ERR "regulator_set_voltage() failed: %d\n",
			       ret);
			return;
		}
	}

	if (data->min_uV && data->max_uV && !data->enabled) {
		ret = regulator_enable(data->regulator);
		if (ret == 0)
			data->enabled = 1;
		else
			printk(KERN_ERR "regulator_enable() failed: %d\n",
				ret);
	}

	if (!(data->min_uV && data->max_uV) && data->enabled) {
		ret = regulator_disable(data->regulator);
		if (ret == 0)
			data->enabled = 0;
		else
			printk(KERN_ERR "regulator_disable() failed: %d\n",
				ret);
	}
}

static void update_current_limit_constraints(struct virtual_consumer_data
						*data)
{
	int ret;

	if (data->max_uA
	    && data->min_uA <= data->max_uA) {
		ret = regulator_set_current_limit(data->regulator,
					data->min_uA, data->max_uA);
		if (ret != 0) {
			pr_err("regulator_set_current_limit() failed: %d\n",
			       ret);
			return;
		}
	}

	if (data->max_uA && !data->enabled) {
		ret = regulator_enable(data->regulator);
		if (ret == 0)
			data->enabled = 1;
		else
			printk(KERN_ERR "regulator_enable() failed: %d\n",
				ret);
	}

	if (!(data->min_uA && data->max_uA) && data->enabled) {
		ret = regulator_disable(data->regulator);
		if (ret == 0)
			data->enabled = 0;
		else
			printk(KERN_ERR "regulator_disable() failed: %d\n",
				ret);
	}
}

static ssize_t show_min_uV(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->min_uV);
}

static ssize_t set_min_uV(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->min_uV = val;
	update_voltage_constraints(data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_max_uV(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->max_uV);
}

static ssize_t set_max_uV(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->max_uV = val;
	update_voltage_constraints(data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_min_uA(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->min_uA);
}

static ssize_t set_min_uA(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->min_uA = val;
	update_current_limit_constraints(data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_max_uA(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->max_uA);
}

static ssize_t set_max_uA(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	long val;

	if (strict_strtol(buf, 10, &val) != 0)
		return count;

	mutex_lock(&data->lock);

	data->max_uA = val;
	update_current_limit_constraints(data);

	mutex_unlock(&data->lock);

	return count;
}

static ssize_t show_mode(struct device *dev,
			 struct device_attribute *attr, char *buf)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);

	switch (data->mode) {
	case REGULATOR_MODE_FAST:
		return sprintf(buf, "fast\n");
	case REGULATOR_MODE_NORMAL:
		return sprintf(buf, "normal\n");
	case REGULATOR_MODE_IDLE:
		return sprintf(buf, "idle\n");
	case REGULATOR_MODE_STANDBY:
		return sprintf(buf, "standby\n");
	default:
		return sprintf(buf, "unknown\n");
	}
}

static ssize_t set_mode(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct virtual_consumer_data *data = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (strncmp(buf, "fast", strlen("fast")) == 0)
		mode = REGULATOR_MODE_FAST;
	else if (strncmp(buf, "normal", strlen("normal")) == 0)
		mode = REGULATOR_MODE_NORMAL;
	else if (strncmp(buf, "idle", strlen("idle")) == 0)
		mode = REGULATOR_MODE_IDLE;
	else if (strncmp(buf, "standby", strlen("standby")) == 0)
		mode = REGULATOR_MODE_STANDBY;
	else {
		dev_err(dev, "Configuring invalid mode\n");
		return count;
	}

	mutex_lock(&data->lock);
	ret = regulator_set_mode(data->regulator, mode);
	if (ret == 0)
		data->mode = mode;
	else
		dev_err(dev, "Failed to configure mode: %d\n", ret);
	mutex_unlock(&data->lock);

	return count;
}

static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
static DEVICE_ATTR(mode, 0666, show_mode, set_mode);

struct device_attribute *attributes[] = {
	&dev_attr_min_microvolts,
	&dev_attr_max_microvolts,
	&dev_attr_min_microamps,
	&dev_attr_max_microamps,
	&dev_attr_mode,
};

static int regulator_virtual_consumer_probe(struct platform_device *pdev)
{
	char *reg_id = pdev->dev.platform_data;
	struct virtual_consumer_data *drvdata;
	int ret, i;

	drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
	if (drvdata == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	mutex_init(&drvdata->lock);

	drvdata->regulator = regulator_get(&pdev->dev, reg_id);
	if (IS_ERR(drvdata->regulator)) {
		ret = PTR_ERR(drvdata->regulator);
		goto err;
	}

	for (i = 0; i < ARRAY_SIZE(attributes); i++) {
		ret = device_create_file(&pdev->dev, attributes[i]);
		if (ret != 0)
			goto err;
	}

	drvdata->mode = regulator_get_mode(drvdata->regulator);

	platform_set_drvdata(pdev, drvdata);

	return 0;

err:
	for (i = 0; i < ARRAY_SIZE(attributes); i++)
		device_remove_file(&pdev->dev, attributes[i]);
	kfree(drvdata);
	return ret;
}

static int regulator_virtual_consumer_remove(struct platform_device *pdev)
{
	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
	int i;

	for (i = 0; i < ARRAY_SIZE(attributes); i++)
		device_remove_file(&pdev->dev, attributes[i]);
	if (drvdata->enabled)
		regulator_disable(drvdata->regulator);
	regulator_put(drvdata->regulator);

	kfree(drvdata);

	return 0;
}

static struct platform_driver regulator_virtual_consumer_driver = {
	.probe		= regulator_virtual_consumer_probe,
	.remove		= regulator_virtual_consumer_remove,
	.driver		= {
		.name		= "reg-virt-consumer",
	},
};


static int __init regulator_virtual_consumer_init(void)
{
	return platform_driver_register(&regulator_virtual_consumer_driver);
}
module_init(regulator_virtual_consumer_init);

static void __exit regulator_virtual_consumer_exit(void)
{
	platform_driver_unregister(&regulator_virtual_consumer_driver);
}
module_exit(regulator_virtual_consumer_exit);

MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("Virtual regulator consumer");
MODULE_LICENSE("GPL");
Commit	Line	Data
c080909e MB	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
	19	struct virtual_consumer_data {
	20	struct mutex lock;
	21	struct regulator *regulator;
	22	int enabled;
	23	int min_uV;
	24	int max_uV;
	25	int min_uA;
	26	int max_uA;
	27	unsigned int mode;
	28	};
	29
	30	static void update_voltage_constraints(struct virtual_consumer_data *data)
	31	{
	32	int ret;
	33
	34	if (data->min_uV && data->max_uV
	35	&& data->min_uV <= data->max_uV) {
	36	ret = regulator_set_voltage(data->regulator,
	37	data->min_uV, data->max_uV);
	38	if (ret != 0) {
	39	printk(KERN_ERR "regulator_set_voltage() failed: %d\n",
	40	ret);
	41	return;
	42	}
	43	}
	44
	45	if (data->min_uV && data->max_uV && !data->enabled) {
	46	ret = regulator_enable(data->regulator);
	47	if (ret == 0)
	48	data->enabled = 1;
	49	else
	50	printk(KERN_ERR "regulator_enable() failed: %d\n",
	51	ret);
	52	}
	53
	54	if (!(data->min_uV && data->max_uV) && data->enabled) {
	55	ret = regulator_disable(data->regulator);
	56	if (ret == 0)
	57	data->enabled = 0;
	58	else
	59	printk(KERN_ERR "regulator_disable() failed: %d\n",
	60	ret);
	61	}
	62	}
	63
	64	static void update_current_limit_constraints(struct virtual_consumer_data
65	*data)
66	{
67	int ret;
68
69	if (data->max_uA
70	&& data->min_uA <= data->max_uA) {
71	ret = regulator_set_current_limit(data->regulator,
72	data->min_uA, data->max_uA);
73	if (ret != 0) {
74	pr_err("regulator_set_current_limit() failed: %d\n",
75	ret);
76	return;
77	}
78	}
79
80	if (data->max_uA && !data->enabled) {
81	ret = regulator_enable(data->regulator);
82	if (ret == 0)
83	data->enabled = 1;
84	else
85	printk(KERN_ERR "regulator_enable() failed: %d\n",
86	ret);
87	}
88
89	if (!(data->min_uA && data->max_uA) && data->enabled) {
90	ret = regulator_disable(data->regulator);
91	if (ret == 0)
92	data->enabled = 0;
93	else
94	printk(KERN_ERR "regulator_disable() failed: %d\n",
95	ret);
96	}
97	}
98
99	static ssize_t show_min_uV(struct device *dev,
100	struct device_attribute attr, char buf)
101	{
102	struct virtual_consumer_data *data = dev_get_drvdata(dev);
103	return sprintf(buf, "%d\n", data->min_uV);
104	}
105
106	static ssize_t set_min_uV(struct device dev, struct device_attribute attr,
107	const char *buf, size_t count)
108	{
109	struct virtual_consumer_data *data = dev_get_drvdata(dev);
110	long val;
111
112	if (strict_strtol(buf, 10, &val) != 0)
113	return count;
114
115	mutex_lock(&data->lock);
116
117	data->min_uV = val;
118	update_voltage_constraints(data);
119
120	mutex_unlock(&data->lock);
121
122	return count;
123	}
124
125	static ssize_t show_max_uV(struct device *dev,
126	struct device_attribute attr, char buf)
127	{
128	struct virtual_consumer_data *data = dev_get_drvdata(dev);
129	return sprintf(buf, "%d\n", data->max_uV);
130	}
131
132	static ssize_t set_max_uV(struct device dev, struct device_attribute attr,
133	const char *buf, size_t count)
134	{
135	struct virtual_consumer_data *data = dev_get_drvdata(dev);
136	long val;
137
138	if (strict_strtol(buf, 10, &val) != 0)
139	return count;
140
141	mutex_lock(&data->lock);
142
143	data->max_uV = val;
144	update_voltage_constraints(data);
145
146	mutex_unlock(&data->lock);
147
148	return count;
149	}
150
151	static ssize_t show_min_uA(struct device *dev,
152	struct device_attribute attr, char buf)
153	{
154	struct virtual_consumer_data *data = dev_get_drvdata(dev);
155	return sprintf(buf, "%d\n", data->min_uA);
156	}
157
158	static ssize_t set_min_uA(struct device dev, struct device_attribute attr,
159	const char *buf, size_t count)
160	{
161	struct virtual_consumer_data *data = dev_get_drvdata(dev);
162	long val;
163
164	if (strict_strtol(buf, 10, &val) != 0)
165	return count;
166
167	mutex_lock(&data->lock);
168
169	data->min_uA = val;
170	update_current_limit_constraints(data);
171
172	mutex_unlock(&data->lock);
173
174	return count;
175	}
176
177	static ssize_t show_max_uA(struct device *dev,
178	struct device_attribute attr, char buf)
179	{
180	struct virtual_consumer_data *data = dev_get_drvdata(dev);
181	return sprintf(buf, "%d\n", data->max_uA);
182	}
183
184	static ssize_t set_max_uA(struct device dev, struct device_attribute attr,
185	const char *buf, size_t count)
186	{
187	struct virtual_consumer_data *data = dev_get_drvdata(dev);
188	long val;
189
190	if (strict_strtol(buf, 10, &val) != 0)
191	return count;
192
193	mutex_lock(&data->lock);
194
195	data->max_uA = val;
196	update_current_limit_constraints(data);
197
198	mutex_unlock(&data->lock);
199
200	return count;
201	}
202
203	static ssize_t show_mode(struct device *dev,
204	struct device_attribute attr, char buf)
205	{
206	struct virtual_consumer_data *data = dev_get_drvdata(dev);
207
208	switch (data->mode) {
209	case REGULATOR_MODE_FAST:
210	return sprintf(buf, "fast\n");
211	case REGULATOR_MODE_NORMAL:
212	return sprintf(buf, "normal\n");
213	case REGULATOR_MODE_IDLE:
214	return sprintf(buf, "idle\n");
215	case REGULATOR_MODE_STANDBY:
216	return sprintf(buf, "standby\n");
217	default:
218	return sprintf(buf, "unknown\n");
219	}
220	}
221
222	static ssize_t set_mode(struct device dev, struct device_attribute attr,
223	const char *buf, size_t count)
224	{
225	struct virtual_consumer_data *data = dev_get_drvdata(dev);
226	unsigned int mode;
227	int ret;
228
229	if (strncmp(buf, "fast", strlen("fast")) == 0)
230	mode = REGULATOR_MODE_FAST;
231	else if (strncmp(buf, "normal", strlen("normal")) == 0)
232	mode = REGULATOR_MODE_NORMAL;
233	else if (strncmp(buf, "idle", strlen("idle")) == 0)
234	mode = REGULATOR_MODE_IDLE;
235	else if (strncmp(buf, "standby", strlen("standby")) == 0)
236	mode = REGULATOR_MODE_STANDBY;
237	else {
238	dev_err(dev, "Configuring invalid mode\n");
239	return count;
240	}
241
242	mutex_lock(&data->lock);
243	ret = regulator_set_mode(data->regulator, mode);
244	if (ret == 0)
245	data->mode = mode;
246	else
247	dev_err(dev, "Failed to configure mode: %d\n", ret);
248	mutex_unlock(&data->lock);
249
250	return count;
251	}
252
253	static DEVICE_ATTR(min_microvolts, 0666, show_min_uV, set_min_uV);
254	static DEVICE_ATTR(max_microvolts, 0666, show_max_uV, set_max_uV);
255	static DEVICE_ATTR(min_microamps, 0666, show_min_uA, set_min_uA);
256	static DEVICE_ATTR(max_microamps, 0666, show_max_uA, set_max_uA);
257	static DEVICE_ATTR(mode, 0666, show_mode, set_mode);
258
259	struct device_attribute *attributes[] = {
260	&dev_attr_min_microvolts,
261	&dev_attr_max_microvolts,
262	&dev_attr_min_microamps,
263	&dev_attr_max_microamps,
264	&dev_attr_mode,
265	};
266
267	static int regulator_virtual_consumer_probe(struct platform_device *pdev)
268	{
269	char *reg_id = pdev->dev.platform_data;
270	struct virtual_consumer_data *drvdata;
271	int ret, i;
272
273	drvdata = kzalloc(sizeof(struct virtual_consumer_data), GFP_KERNEL);
274	if (drvdata == NULL) {
275	ret = -ENOMEM;
276	goto err;
277	}
278
279	mutex_init(&drvdata->lock);
280
281	drvdata->regulator = regulator_get(&pdev->dev, reg_id);
282	if (IS_ERR(drvdata->regulator)) {
283	ret = PTR_ERR(drvdata->regulator);
284	goto err;
285	}
286
287	for (i = 0; i < ARRAY_SIZE(attributes); i++) {
288	ret = device_create_file(&pdev->dev, attributes[i]);
289	if (ret != 0)
290	goto err;
291	}
292
293	drvdata->mode = regulator_get_mode(drvdata->regulator);
294
295	platform_set_drvdata(pdev, drvdata);
296
297	return 0;
298
299	err:
300	for (i = 0; i < ARRAY_SIZE(attributes); i++)
301	device_remove_file(&pdev->dev, attributes[i]);
302	kfree(drvdata);
303	return ret;
304	}
305
306	static int regulator_virtual_consumer_remove(struct platform_device *pdev)
307	{
308	struct virtual_consumer_data *drvdata = platform_get_drvdata(pdev);
309	int i;
310
311	for (i = 0; i < ARRAY_SIZE(attributes); i++)
312	device_remove_file(&pdev->dev, attributes[i]);
313	if (drvdata->enabled)
314	regulator_disable(drvdata->regulator);
315	regulator_put(drvdata->regulator);
316
317	kfree(drvdata);
318
319	return 0;
320	}
321
322	static struct platform_driver regulator_virtual_consumer_driver = {
323	.probe = regulator_virtual_consumer_probe,
324	.remove = regulator_virtual_consumer_remove,
325	.driver = {
326	.name = "reg-virt-consumer",
327	},
328	};
329
330
331	static int __init regulator_virtual_consumer_init(void)
332	{
333	return platform_driver_register(&regulator_virtual_consumer_driver);
334	}
335	module_init(regulator_virtual_consumer_init);
336
337	static void __exit regulator_virtual_consumer_exit(void)
338	{
339	platform_driver_unregister(&regulator_virtual_consumer_driver);
340	}
341	module_exit(regulator_virtual_consumer_exit);
342
343	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
344	MODULE_DESCRIPTION("Virtual regulator consumer");
345	MODULE_LICENSE("GPL");