[mirror_ubuntu-jammy-kernel.git] / drivers / regulator / helpers.c

/*
 * helpers.c  --  Voltage/Current Regulator framework helper functions.
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 * Copyright 2008 SlimLogic Ltd.
 *
 *  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/kernel.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>

/**
 * regulator_is_enabled_regmap - standard is_enabled() for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * enable_reg and enable_mask fields in their descriptor and then use
 * this as their is_enabled operation, saving some code.
 */
int regulator_is_enabled_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
	if (ret != 0)
		return ret;

	if (rdev->desc->enable_is_inverted)
		return (val & rdev->desc->enable_mask) == 0;
	else
		return (val & rdev->desc->enable_mask) != 0;
}
EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);

/**
 * regulator_enable_regmap - standard enable() for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * enable_reg and enable_mask fields in their descriptor and then use
 * this as their enable() operation, saving some code.
 */
int regulator_enable_regmap(struct regulator_dev *rdev)
{
	unsigned int val;

	if (rdev->desc->enable_is_inverted)
		val = 0;
	else
		val = rdev->desc->enable_mask;

	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				  rdev->desc->enable_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_enable_regmap);

/**
 * regulator_disable_regmap - standard disable() for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * enable_reg and enable_mask fields in their descriptor and then use
 * this as their disable() operation, saving some code.
 */
int regulator_disable_regmap(struct regulator_dev *rdev)
{
	unsigned int val;

	if (rdev->desc->enable_is_inverted)
		val = rdev->desc->enable_mask;
	else
		val = 0;

	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				  rdev->desc->enable_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_disable_regmap);

/**
 * regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
 *
 * @rdev: regulator to operate on
 *
 * Regulators that use regmap for their register I/O can set the
 * vsel_reg and vsel_mask fields in their descriptor and then use this
 * as their get_voltage_vsel operation, saving some code.
 */
int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
}
EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);

/**
 * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
 *
 * @rdev: regulator to operate on
 * @sel: Selector to set
 *
 * Regulators that use regmap for their register I/O can set the
 * vsel_reg and vsel_mask fields in their descriptor and then use this
 * as their set_voltage_vsel operation, saving some code.
 */
int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
{
	int ret;

	sel <<= ffs(rdev->desc->vsel_mask) - 1;

	ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
				  rdev->desc->vsel_mask, sel);
	if (ret)
		return ret;

	if (rdev->desc->apply_bit)
		ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
					 rdev->desc->apply_bit,
					 rdev->desc->apply_bit);
	return ret;
}
EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);

/**
 * regulator_map_voltage_iterate - map_voltage() based on list_voltage()
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers implementing set_voltage_sel() and list_voltage() can use
 * this as their map_voltage() operation.  It will find a suitable
 * voltage by calling list_voltage() until it gets something in bounds
 * for the requested voltages.
 */
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
				  int min_uV, int max_uV)
{
	int best_val = INT_MAX;
	int selector = 0;
	int i, ret;

	/* Find the smallest voltage that falls within the specified
	 * range.
	 */
	for (i = 0; i < rdev->desc->n_voltages; i++) {
		ret = rdev->desc->ops->list_voltage(rdev, i);
		if (ret < 0)
			continue;

		if (ret < best_val && ret >= min_uV && ret <= max_uV) {
			best_val = ret;
			selector = i;
		}
	}

	if (best_val != INT_MAX)
		return selector;
	else
		return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);

/**
 * regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers that have ascendant voltage list can use this as their
 * map_voltage() operation.
 */
int regulator_map_voltage_ascend(struct regulator_dev *rdev,
				 int min_uV, int max_uV)
{
	int i, ret;

	for (i = 0; i < rdev->desc->n_voltages; i++) {
		ret = rdev->desc->ops->list_voltage(rdev, i);
		if (ret < 0)
			continue;

		if (ret > max_uV)
			break;

		if (ret >= min_uV && ret <= max_uV)
			return i;
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);

/**
 * regulator_map_voltage_linear - map_voltage() for simple linear mappings
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers providing min_uV and uV_step in their regulator_desc can
 * use this as their map_voltage() operation.
 */
int regulator_map_voltage_linear(struct regulator_dev *rdev,
				 int min_uV, int max_uV)
{
	int ret, voltage;

	/* Allow uV_step to be 0 for fixed voltage */
	if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
		if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
			return 0;
		else
			return -EINVAL;
	}

	if (!rdev->desc->uV_step) {
		BUG_ON(!rdev->desc->uV_step);
		return -EINVAL;
	}

	if (min_uV < rdev->desc->min_uV)
		min_uV = rdev->desc->min_uV;

	ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
	if (ret < 0)
		return ret;

	ret += rdev->desc->linear_min_sel;

	/* Map back into a voltage to verify we're still in bounds */
	voltage = rdev->desc->ops->list_voltage(rdev, ret);
	if (voltage < min_uV || voltage > max_uV)
		return -EINVAL;

	return ret;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);

/**
 * regulator_map_voltage_linear - map_voltage() for multiple linear ranges
 *
 * @rdev: Regulator to operate on
 * @min_uV: Lower bound for voltage
 * @max_uV: Upper bound for voltage
 *
 * Drivers providing linear_ranges in their descriptor can use this as
 * their map_voltage() callback.
 */
int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
				       int min_uV, int max_uV)
{
	const struct regulator_linear_range *range;
	int ret = -EINVAL;
	int voltage, i;

	if (!rdev->desc->n_linear_ranges) {
		BUG_ON(!rdev->desc->n_linear_ranges);
		return -EINVAL;
	}

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		range = &rdev->desc->linear_ranges[i];

		if (!(min_uV <= range->max_uV && max_uV >= range->min_uV))
			continue;

		if (min_uV <= range->min_uV)
			min_uV = range->min_uV;

		/* range->uV_step == 0 means fixed voltage range */
		if (range->uV_step == 0) {
			ret = 0;
		} else {
			ret = DIV_ROUND_UP(min_uV - range->min_uV,
					   range->uV_step);
			if (ret < 0)
				return ret;
		}

		ret += range->min_sel;

		break;
	}

	if (i == rdev->desc->n_linear_ranges)
		return -EINVAL;

	/* Map back into a voltage to verify we're still in bounds */
	voltage = rdev->desc->ops->list_voltage(rdev, ret);
	if (voltage < min_uV || voltage > max_uV)
		return -EINVAL;

	return ret;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range);

/**
 * regulator_list_voltage_linear - List voltages with simple calculation
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * Regulators with a simple linear mapping between voltages and
 * selectors can set min_uV and uV_step in the regulator descriptor
 * and then use this function as their list_voltage() operation,
 */
int regulator_list_voltage_linear(struct regulator_dev *rdev,
				  unsigned int selector)
{
	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;
	if (selector < rdev->desc->linear_min_sel)
		return 0;

	selector -= rdev->desc->linear_min_sel;

	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);

/**
 * regulator_list_voltage_linear_range - List voltages for linear ranges
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * Regulators with a series of simple linear mappings between voltages
 * and selectors can set linear_ranges in the regulator descriptor and
 * then use this function as their list_voltage() operation,
 */
int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
					unsigned int selector)
{
	const struct regulator_linear_range *range;
	int i;

	if (!rdev->desc->n_linear_ranges) {
		BUG_ON(!rdev->desc->n_linear_ranges);
		return -EINVAL;
	}

	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
		range = &rdev->desc->linear_ranges[i];

		if (!(selector >= range->min_sel &&
		      selector <= range->max_sel))
			continue;

		selector -= range->min_sel;

		return range->min_uV + (range->uV_step * selector);
	}

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);

/**
 * regulator_list_voltage_table - List voltages with table based mapping
 *
 * @rdev: Regulator device
 * @selector: Selector to convert into a voltage
 *
 * Regulators with table based mapping between voltages and
 * selectors can set volt_table in the regulator descriptor
 * and then use this function as their list_voltage() operation.
 */
int regulator_list_voltage_table(struct regulator_dev *rdev,
				 unsigned int selector)
{
	if (!rdev->desc->volt_table) {
		BUG_ON(!rdev->desc->volt_table);
		return -EINVAL;
	}

	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;

	return rdev->desc->volt_table[selector];
}
EXPORT_SYMBOL_GPL(regulator_list_voltage_table);

/**
 * regulator_set_bypass_regmap - Default set_bypass() using regmap
 *
 * @rdev: device to operate on.
 * @enable: state to set.
 */
int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
{
	unsigned int val;

	if (enable)
		val = rdev->desc->bypass_mask;
	else
		val = 0;

	return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
				  rdev->desc->bypass_mask, val);
}
EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);

/**
 * regulator_get_bypass_regmap - Default get_bypass() using regmap
 *
 * @rdev: device to operate on.
 * @enable: current state.
 */
int regulator_get_bypass_regmap(struct regulator_dev *rdev, bool *enable)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
	if (ret != 0)
		return ret;

	*enable = val & rdev->desc->bypass_mask;

	return 0;
}
EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);
Commit	Line	Data
c4a54b8d MB	1	/*
	2	* helpers.c -- Voltage/Current Regulator framework helper functions.
	3	*
	4	* Copyright 2007, 2008 Wolfson Microelectronics PLC.
	5	* Copyright 2008 SlimLogic Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/err.h>
	16	#include <linux/delay.h>
	17	#include <linux/regmap.h>
	18	#include <linux/regulator/consumer.h>
	19	#include <linux/regulator/driver.h>
	20	#include <linux/module.h>
	21
	22	/**
	23	* regulator_is_enabled_regmap - standard is_enabled() for regmap users
	24	*
	25	* @rdev: regulator to operate on
	26	*
	27	* Regulators that use regmap for their register I/O can set the
	28	* enable_reg and enable_mask fields in their descriptor and then use
	29	* this as their is_enabled operation, saving some code.
	30	*/
	31	int regulator_is_enabled_regmap(struct regulator_dev *rdev)
	32	{
	33	unsigned int val;
	34	int ret;
	35
	36	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);
	37	if (ret != 0)
	38	return ret;
	39
	40	if (rdev->desc->enable_is_inverted)
	41	return (val & rdev->desc->enable_mask) == 0;
	42	else
	43	return (val & rdev->desc->enable_mask) != 0;
	44	}
	45	EXPORT_SYMBOL_GPL(regulator_is_enabled_regmap);
	46
	47	/**
	48	* regulator_enable_regmap - standard enable() for regmap users
	49	*
	50	* @rdev: regulator to operate on
	51	*
	52	* Regulators that use regmap for their register I/O can set the
	53	* enable_reg and enable_mask fields in their descriptor and then use
	54	* this as their enable() operation, saving some code.
	55	*/
	56	int regulator_enable_regmap(struct regulator_dev *rdev)
	57	{
	58	unsigned int val;
	59
	60	if (rdev->desc->enable_is_inverted)
	61	val = 0;
	62	else
	63	val = rdev->desc->enable_mask;
	64
65	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
66	rdev->desc->enable_mask, val);
67	}
68	EXPORT_SYMBOL_GPL(regulator_enable_regmap);
69
70	/**
71	* regulator_disable_regmap - standard disable() for regmap users
72	*
73	* @rdev: regulator to operate on
74	*
75	* Regulators that use regmap for their register I/O can set the
76	* enable_reg and enable_mask fields in their descriptor and then use
77	* this as their disable() operation, saving some code.
78	*/
79	int regulator_disable_regmap(struct regulator_dev *rdev)
80	{
81	unsigned int val;
82
83	if (rdev->desc->enable_is_inverted)
84	val = rdev->desc->enable_mask;
85	else
86	val = 0;
87
88	return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
89	rdev->desc->enable_mask, val);
90	}
91	EXPORT_SYMBOL_GPL(regulator_disable_regmap);
92
93	/**
94	* regulator_get_voltage_sel_regmap - standard get_voltage_sel for regmap users
95	*
96	* @rdev: regulator to operate on
97	*
98	* Regulators that use regmap for their register I/O can set the
99	* vsel_reg and vsel_mask fields in their descriptor and then use this
100	* as their get_voltage_vsel operation, saving some code.
101	*/
102	int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev)
103	{
104	unsigned int val;
105	int ret;
106
107	ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
108	if (ret != 0)
109	return ret;
110
111	val &= rdev->desc->vsel_mask;
112	val >>= ffs(rdev->desc->vsel_mask) - 1;
113
114	return val;
115	}
116	EXPORT_SYMBOL_GPL(regulator_get_voltage_sel_regmap);
117
118	/**
119	* regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
120	*
121	* @rdev: regulator to operate on
122	* @sel: Selector to set
123	*
124	* Regulators that use regmap for their register I/O can set the
125	* vsel_reg and vsel_mask fields in their descriptor and then use this
126	* as their set_voltage_vsel operation, saving some code.
127	*/
128	int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
129	{
130	int ret;
131
132	sel <<= ffs(rdev->desc->vsel_mask) - 1;
133
134	ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
135	rdev->desc->vsel_mask, sel);
136	if (ret)
137	return ret;
138
139	if (rdev->desc->apply_bit)
140	ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
141	rdev->desc->apply_bit,
142	rdev->desc->apply_bit);
143	return ret;
144	}
145	EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
146
147	/**
148	* regulator_map_voltage_iterate - map_voltage() based on list_voltage()
149	*
150	* @rdev: Regulator to operate on
151	* @min_uV: Lower bound for voltage
152	* @max_uV: Upper bound for voltage
153	*
154	* Drivers implementing set_voltage_sel() and list_voltage() can use
155	* this as their map_voltage() operation. It will find a suitable
156	* voltage by calling list_voltage() until it gets something in bounds
157	* for the requested voltages.
158	*/
159	int regulator_map_voltage_iterate(struct regulator_dev *rdev,
160	int min_uV, int max_uV)
161	{
162	int best_val = INT_MAX;
163	int selector = 0;
164	int i, ret;
165
166	/* Find the smallest voltage that falls within the specified
167	* range.
168	*/
169	for (i = 0; i < rdev->desc->n_voltages; i++) {
170	ret = rdev->desc->ops->list_voltage(rdev, i);
171	if (ret < 0)
172	continue;
173
174	if (ret < best_val && ret >= min_uV && ret <= max_uV) {
175	best_val = ret;
176	selector = i;
177	}
178	}
179
180	if (best_val != INT_MAX)
181	return selector;
182	else
183	return -EINVAL;
184	}
185	EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
186
187	/**
188	* regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
189	*
190	* @rdev: Regulator to operate on
191	* @min_uV: Lower bound for voltage
192	* @max_uV: Upper bound for voltage
193	*
194	* Drivers that have ascendant voltage list can use this as their
195	* map_voltage() operation.
196	*/
197	int regulator_map_voltage_ascend(struct regulator_dev *rdev,
198	int min_uV, int max_uV)
199	{
200	int i, ret;
201
202	for (i = 0; i < rdev->desc->n_voltages; i++) {
203	ret = rdev->desc->ops->list_voltage(rdev, i);
204	if (ret < 0)
205	continue;
206
207	if (ret > max_uV)
208	break;
209
210	if (ret >= min_uV && ret <= max_uV)
211	return i;
212	}
213
214	return -EINVAL;
215	}
216	EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
217
218	/**
219	* regulator_map_voltage_linear - map_voltage() for simple linear mappings
220	*
221	* @rdev: Regulator to operate on
222	* @min_uV: Lower bound for voltage
223	* @max_uV: Upper bound for voltage
224	*
225	* Drivers providing min_uV and uV_step in their regulator_desc can
226	* use this as their map_voltage() operation.
227	*/
228	int regulator_map_voltage_linear(struct regulator_dev *rdev,
229	int min_uV, int max_uV)
230	{
231	int ret, voltage;
232
233	/* Allow uV_step to be 0 for fixed voltage */
234	if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
235	if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
236	return 0;
237	else
238	return -EINVAL;
239	}
240
241	if (!rdev->desc->uV_step) {
242	BUG_ON(!rdev->desc->uV_step);
243	return -EINVAL;
244	}
245
246	if (min_uV < rdev->desc->min_uV)
247	min_uV = rdev->desc->min_uV;
248
249	ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
250	if (ret < 0)
251	return ret;
252
253	ret += rdev->desc->linear_min_sel;
254
255	/* Map back into a voltage to verify we're still in bounds */
256	voltage = rdev->desc->ops->list_voltage(rdev, ret);
257	if (voltage < min_uV \|\| voltage > max_uV)
258	return -EINVAL;
259
260	return ret;
261	}
262	EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
263
264	/**
265	* regulator_map_voltage_linear - map_voltage() for multiple linear ranges
266	*
267	* @rdev: Regulator to operate on
268	* @min_uV: Lower bound for voltage
269	* @max_uV: Upper bound for voltage
270	*
271	* Drivers providing linear_ranges in their descriptor can use this as
272	* their map_voltage() callback.
273	*/
274	int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
275	int min_uV, int max_uV)
276	{
277	const struct regulator_linear_range *range;
278	int ret = -EINVAL;
279	int voltage, i;
280
281	if (!rdev->desc->n_linear_ranges) {
282	BUG_ON(!rdev->desc->n_linear_ranges);
283	return -EINVAL;
284	}
285
286	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
287	range = &rdev->desc->linear_ranges[i];
288
289	if (!(min_uV <= range->max_uV && max_uV >= range->min_uV))
290	continue;
291
292	if (min_uV <= range->min_uV)
293	min_uV = range->min_uV;
294
295	/* range->uV_step == 0 means fixed voltage range */
296	if (range->uV_step == 0) {
297	ret = 0;
298	} else {
299	ret = DIV_ROUND_UP(min_uV - range->min_uV,
300	range->uV_step);
301	if (ret < 0)
302	return ret;
303	}
304
305	ret += range->min_sel;
306
307	break;
308	}
309
310	if (i == rdev->desc->n_linear_ranges)
311	return -EINVAL;
312
313	/* Map back into a voltage to verify we're still in bounds */
314	voltage = rdev->desc->ops->list_voltage(rdev, ret);
315	if (voltage < min_uV \|\| voltage > max_uV)
316	return -EINVAL;
317
318	return ret;
319	}
320	EXPORT_SYMBOL_GPL(regulator_map_voltage_linear_range);
321
d295f767 AL	322	/**
	323	* regulator_list_voltage_linear - List voltages with simple calculation
	324	*
	325	* @rdev: Regulator device
	326	* @selector: Selector to convert into a voltage
	327	*
	328	* Regulators with a simple linear mapping between voltages and
	329	* selectors can set min_uV and uV_step in the regulator descriptor
	330	* and then use this function as their list_voltage() operation,
	331	*/
	332	int regulator_list_voltage_linear(struct regulator_dev *rdev,
	333	unsigned int selector)
	334	{
	335	if (selector >= rdev->desc->n_voltages)
	336	return -EINVAL;
	337	if (selector < rdev->desc->linear_min_sel)
	338	return 0;
	339
	340	selector -= rdev->desc->linear_min_sel;
	341
	342	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
	343	}
	344	EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
	345
	346	/**
	347	* regulator_list_voltage_linear_range - List voltages for linear ranges
	348	*
	349	* @rdev: Regulator device
	350	* @selector: Selector to convert into a voltage
	351	*
	352	* Regulators with a series of simple linear mappings between voltages
	353	* and selectors can set linear_ranges in the regulator descriptor and
	354	* then use this function as their list_voltage() operation,
	355	*/
	356	int regulator_list_voltage_linear_range(struct regulator_dev *rdev,
	357	unsigned int selector)
	358	{
	359	const struct regulator_linear_range *range;
	360	int i;
	361
	362	if (!rdev->desc->n_linear_ranges) {
	363	BUG_ON(!rdev->desc->n_linear_ranges);
	364	return -EINVAL;
	365	}
	366
	367	for (i = 0; i < rdev->desc->n_linear_ranges; i++) {
	368	range = &rdev->desc->linear_ranges[i];
	369
	370	if (!(selector >= range->min_sel &&
	371	selector <= range->max_sel))
	372	continue;
	373
	374	selector -= range->min_sel;
	375
	376	return range->min_uV + (range->uV_step * selector);
	377	}
	378
	379	return -EINVAL;
	380	}
	381	EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range);
	382
	383	/**
	384	* regulator_list_voltage_table - List voltages with table based mapping
	385	*
386	* @rdev: Regulator device
387	* @selector: Selector to convert into a voltage
388	*
389	* Regulators with table based mapping between voltages and
390	* selectors can set volt_table in the regulator descriptor
391	* and then use this function as their list_voltage() operation.
392	*/
393	int regulator_list_voltage_table(struct regulator_dev *rdev,
394	unsigned int selector)
395	{
396	if (!rdev->desc->volt_table) {
397	BUG_ON(!rdev->desc->volt_table);
398	return -EINVAL;
399	}
400
401	if (selector >= rdev->desc->n_voltages)
402	return -EINVAL;
403
404	return rdev->desc->volt_table[selector];
405	}
406	EXPORT_SYMBOL_GPL(regulator_list_voltage_table);
407
c4a54b8d MB	408	/**
	409	* regulator_set_bypass_regmap - Default set_bypass() using regmap
	410	*
	411	* @rdev: device to operate on.
	412	* @enable: state to set.
	413	*/
	414	int regulator_set_bypass_regmap(struct regulator_dev *rdev, bool enable)
	415	{
	416	unsigned int val;
	417
	418	if (enable)
	419	val = rdev->desc->bypass_mask;
	420	else
	421	val = 0;
	422
	423	return regmap_update_bits(rdev->regmap, rdev->desc->bypass_reg,
	424	rdev->desc->bypass_mask, val);
	425	}
	426	EXPORT_SYMBOL_GPL(regulator_set_bypass_regmap);
	427
	428	/**
	429	* regulator_get_bypass_regmap - Default get_bypass() using regmap
	430	*
	431	* @rdev: device to operate on.
	432	* @enable: current state.
	433	*/
	434	int regulator_get_bypass_regmap(struct regulator_dev rdev, bool enable)
	435	{
	436	unsigned int val;
	437	int ret;
	438
	439	ret = regmap_read(rdev->regmap, rdev->desc->bypass_reg, &val);
	440	if (ret != 0)
	441	return ret;
	442
	443	*enable = val & rdev->desc->bypass_mask;
	444
	445	return 0;
	446	}
	447	EXPORT_SYMBOL_GPL(regulator_get_bypass_regmap);