2 * Regulator Driver for Freescale MC13xxx PMIC
4 * Copyright 2010 Yong Shen <yong.shen@linaro.org>
6 * Based on mc13783 regulator driver :
7 * Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
8 * Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 * Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file
18 #include <linux/mfd/mc13xxx.h>
19 #include <linux/regulator/machine.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/platform_device.h>
22 #include <linux/kernel.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/err.h>
28 static int mc13xxx_regulator_enable(struct regulator_dev *rdev)
30 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
31 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
32 int id = rdev_get_id(rdev);
35 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
37 mc13xxx_lock(priv->mc13xxx);
38 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
39 mc13xxx_regulators[id].enable_bit,
40 mc13xxx_regulators[id].enable_bit);
41 mc13xxx_unlock(priv->mc13xxx);
46 static int mc13xxx_regulator_disable(struct regulator_dev *rdev)
48 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
49 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
50 int id = rdev_get_id(rdev);
53 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
55 mc13xxx_lock(priv->mc13xxx);
56 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg,
57 mc13xxx_regulators[id].enable_bit, 0);
58 mc13xxx_unlock(priv->mc13xxx);
63 static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev)
65 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
66 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
67 int ret, id = rdev_get_id(rdev);
70 mc13xxx_lock(priv->mc13xxx);
71 ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
72 mc13xxx_unlock(priv->mc13xxx);
77 return (val & mc13xxx_regulators[id].enable_bit) != 0;
80 int mc13xxx_regulator_list_voltage(struct regulator_dev *rdev,
83 int id = rdev_get_id(rdev);
84 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
85 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
87 if (selector >= mc13xxx_regulators[id].desc.n_voltages)
90 return mc13xxx_regulators[id].voltages[selector];
92 EXPORT_SYMBOL_GPL(mc13xxx_regulator_list_voltage);
94 int mc13xxx_get_best_voltage_index(struct regulator_dev *rdev,
95 int min_uV, int max_uV)
97 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
98 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
99 int reg_id = rdev_get_id(rdev);
105 * Locate the minimum voltage fitting the criteria on
106 * this regulator. The switchable voltages are not
107 * in strict falling order so we need to check them
108 * all for the best match.
112 for (i = 0; i < mc13xxx_regulators[reg_id].desc.n_voltages; i++) {
113 if (mc13xxx_regulators[reg_id].voltages[i] >= min_uV &&
114 mc13xxx_regulators[reg_id].voltages[i] < bestmatch) {
115 bestmatch = mc13xxx_regulators[reg_id].voltages[i];
120 if (bestindex < 0 || bestmatch > max_uV) {
121 dev_warn(&rdev->dev, "no possible value for %d<=x<=%d uV\n",
127 EXPORT_SYMBOL_GPL(mc13xxx_get_best_voltage_index);
129 static int mc13xxx_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
130 int max_uV, unsigned *selector)
132 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
133 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
134 int value, id = rdev_get_id(rdev);
137 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
138 __func__, id, min_uV, max_uV);
140 /* Find the best index */
141 value = mc13xxx_get_best_voltage_index(rdev, min_uV, max_uV);
142 dev_dbg(rdev_get_dev(rdev), "%s best value: %d\n", __func__, value);
146 mc13xxx_lock(priv->mc13xxx);
147 ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg,
148 mc13xxx_regulators[id].vsel_mask,
149 value << mc13xxx_regulators[id].vsel_shift);
150 mc13xxx_unlock(priv->mc13xxx);
155 static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev)
157 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
158 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
159 int ret, id = rdev_get_id(rdev);
162 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
164 mc13xxx_lock(priv->mc13xxx);
165 ret = mc13xxx_reg_read(priv->mc13xxx,
166 mc13xxx_regulators[id].vsel_reg, &val);
167 mc13xxx_unlock(priv->mc13xxx);
172 val = (val & mc13xxx_regulators[id].vsel_mask)
173 >> mc13xxx_regulators[id].vsel_shift;
175 dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val);
177 BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages);
179 return mc13xxx_regulators[id].voltages[val];
182 struct regulator_ops mc13xxx_regulator_ops = {
183 .enable = mc13xxx_regulator_enable,
184 .disable = mc13xxx_regulator_disable,
185 .is_enabled = mc13xxx_regulator_is_enabled,
186 .list_voltage = mc13xxx_regulator_list_voltage,
187 .set_voltage = mc13xxx_regulator_set_voltage,
188 .get_voltage = mc13xxx_regulator_get_voltage,
190 EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops);
192 int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV,
193 int max_uV, unsigned *selector)
195 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
196 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
197 int id = rdev_get_id(rdev);
199 dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n",
200 __func__, id, min_uV, max_uV);
202 if (min_uV >= mc13xxx_regulators[id].voltages[0] &&
203 max_uV <= mc13xxx_regulators[id].voltages[0])
208 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage);
210 int mc13xxx_fixed_regulator_get_voltage(struct regulator_dev *rdev)
212 struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
213 struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
214 int id = rdev_get_id(rdev);
216 dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
218 return mc13xxx_regulators[id].voltages[0];
220 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_get_voltage);
222 struct regulator_ops mc13xxx_fixed_regulator_ops = {
223 .enable = mc13xxx_regulator_enable,
224 .disable = mc13xxx_regulator_disable,
225 .is_enabled = mc13xxx_regulator_is_enabled,
226 .list_voltage = mc13xxx_regulator_list_voltage,
227 .set_voltage = mc13xxx_fixed_regulator_set_voltage,
228 .get_voltage = mc13xxx_fixed_regulator_get_voltage,
230 EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops);
232 int mc13xxx_sw_regulator_is_enabled(struct regulator_dev *rdev)
236 EXPORT_SYMBOL_GPL(mc13xxx_sw_regulator_is_enabled);
238 MODULE_LICENSE("GPL v2");
239 MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>");
240 MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC");
241 MODULE_ALIAS("mc13xxx-regulator-core");