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167e3d8a YS |
1 | /* |
2 | * Regulator Driver for Freescale MC13xxx PMIC | |
3 | * | |
4 | * Copyright 2010 Yong Shen <yong.shen@linaro.org> | |
5 | * | |
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> | |
9 | * | |
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. | |
13 | * | |
14 | * Regs infos taken from mc13xxx drivers from freescale and mc13xxx.pdf file | |
15 | * from freescale | |
16 | */ | |
17 | ||
18 | #include <linux/mfd/mc13xxx.h> | |
19 | #include <linux/regulator/machine.h> | |
20 | #include <linux/regulator/driver.h> | |
93bcb23b | 21 | #include <linux/regulator/of_regulator.h> |
167e3d8a YS |
22 | #include <linux/platform_device.h> |
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/err.h> | |
65602c32 | 27 | #include <linux/module.h> |
93bcb23b | 28 | #include <linux/of.h> |
167e3d8a YS |
29 | #include "mc13xxx.h" |
30 | ||
31 | static int mc13xxx_regulator_enable(struct regulator_dev *rdev) | |
32 | { | |
33 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); | |
34 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; | |
35 | int id = rdev_get_id(rdev); | |
36 | int ret; | |
37 | ||
38 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); | |
39 | ||
40 | mc13xxx_lock(priv->mc13xxx); | |
41 | ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, | |
42 | mc13xxx_regulators[id].enable_bit, | |
43 | mc13xxx_regulators[id].enable_bit); | |
44 | mc13xxx_unlock(priv->mc13xxx); | |
45 | ||
46 | return ret; | |
47 | } | |
48 | ||
49 | static int mc13xxx_regulator_disable(struct regulator_dev *rdev) | |
50 | { | |
51 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); | |
52 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; | |
53 | int id = rdev_get_id(rdev); | |
54 | int ret; | |
55 | ||
56 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); | |
57 | ||
58 | mc13xxx_lock(priv->mc13xxx); | |
59 | ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].reg, | |
60 | mc13xxx_regulators[id].enable_bit, 0); | |
61 | mc13xxx_unlock(priv->mc13xxx); | |
62 | ||
63 | return ret; | |
64 | } | |
65 | ||
66 | static int mc13xxx_regulator_is_enabled(struct regulator_dev *rdev) | |
67 | { | |
68 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); | |
69 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; | |
70 | int ret, id = rdev_get_id(rdev); | |
71 | unsigned int val; | |
72 | ||
73 | mc13xxx_lock(priv->mc13xxx); | |
74 | ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val); | |
75 | mc13xxx_unlock(priv->mc13xxx); | |
76 | ||
77 | if (ret) | |
78 | return ret; | |
79 | ||
80 | return (val & mc13xxx_regulators[id].enable_bit) != 0; | |
81 | } | |
82 | ||
939b62d8 AL |
83 | static int mc13xxx_regulator_set_voltage_sel(struct regulator_dev *rdev, |
84 | unsigned selector) | |
167e3d8a YS |
85 | { |
86 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); | |
87 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; | |
939b62d8 | 88 | int id = rdev_get_id(rdev); |
167e3d8a YS |
89 | int ret; |
90 | ||
167e3d8a YS |
91 | mc13xxx_lock(priv->mc13xxx); |
92 | ret = mc13xxx_reg_rmw(priv->mc13xxx, mc13xxx_regulators[id].vsel_reg, | |
93 | mc13xxx_regulators[id].vsel_mask, | |
939b62d8 | 94 | selector << mc13xxx_regulators[id].vsel_shift); |
167e3d8a YS |
95 | mc13xxx_unlock(priv->mc13xxx); |
96 | ||
97 | return ret; | |
98 | } | |
99 | ||
100 | static int mc13xxx_regulator_get_voltage(struct regulator_dev *rdev) | |
101 | { | |
102 | struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev); | |
103 | struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators; | |
104 | int ret, id = rdev_get_id(rdev); | |
105 | unsigned int val; | |
106 | ||
107 | dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id); | |
108 | ||
109 | mc13xxx_lock(priv->mc13xxx); | |
110 | ret = mc13xxx_reg_read(priv->mc13xxx, | |
111 | mc13xxx_regulators[id].vsel_reg, &val); | |
112 | mc13xxx_unlock(priv->mc13xxx); | |
113 | ||
114 | if (ret) | |
115 | return ret; | |
116 | ||
117 | val = (val & mc13xxx_regulators[id].vsel_mask) | |
118 | >> mc13xxx_regulators[id].vsel_shift; | |
119 | ||
120 | dev_dbg(rdev_get_dev(rdev), "%s id: %d val: %d\n", __func__, id, val); | |
121 | ||
3c24019d | 122 | BUG_ON(val >= mc13xxx_regulators[id].desc.n_voltages); |
167e3d8a | 123 | |
34e74f39 | 124 | return rdev->desc->volt_table[val]; |
167e3d8a YS |
125 | } |
126 | ||
127 | struct regulator_ops mc13xxx_regulator_ops = { | |
128 | .enable = mc13xxx_regulator_enable, | |
129 | .disable = mc13xxx_regulator_disable, | |
130 | .is_enabled = mc13xxx_regulator_is_enabled, | |
34e74f39 | 131 | .list_voltage = regulator_list_voltage_table, |
939b62d8 | 132 | .set_voltage_sel = mc13xxx_regulator_set_voltage_sel, |
167e3d8a YS |
133 | .get_voltage = mc13xxx_regulator_get_voltage, |
134 | }; | |
4d7071f1 | 135 | EXPORT_SYMBOL_GPL(mc13xxx_regulator_ops); |
167e3d8a YS |
136 | |
137 | int mc13xxx_fixed_regulator_set_voltage(struct regulator_dev *rdev, int min_uV, | |
138 | int max_uV, unsigned *selector) | |
139 | { | |
167e3d8a YS |
140 | int id = rdev_get_id(rdev); |
141 | ||
142 | dev_dbg(rdev_get_dev(rdev), "%s id: %d min_uV: %d max_uV: %d\n", | |
143 | __func__, id, min_uV, max_uV); | |
144 | ||
34e74f39 | 145 | if (min_uV <= rdev->desc->volt_table[0] && |
13407ea8 AL |
146 | rdev->desc->volt_table[0] <= max_uV) { |
147 | *selector = 0; | |
167e3d8a | 148 | return 0; |
13407ea8 | 149 | } else { |
167e3d8a | 150 | return -EINVAL; |
13407ea8 | 151 | } |
167e3d8a | 152 | } |
4d7071f1 | 153 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_set_voltage); |
167e3d8a | 154 | |
167e3d8a YS |
155 | struct regulator_ops mc13xxx_fixed_regulator_ops = { |
156 | .enable = mc13xxx_regulator_enable, | |
157 | .disable = mc13xxx_regulator_disable, | |
158 | .is_enabled = mc13xxx_regulator_is_enabled, | |
34e74f39 | 159 | .list_voltage = regulator_list_voltage_table, |
167e3d8a | 160 | .set_voltage = mc13xxx_fixed_regulator_set_voltage, |
167e3d8a | 161 | }; |
4d7071f1 | 162 | EXPORT_SYMBOL_GPL(mc13xxx_fixed_regulator_ops); |
167e3d8a | 163 | |
93bcb23b SG |
164 | #ifdef CONFIG_OF |
165 | int __devinit mc13xxx_get_num_regulators_dt(struct platform_device *pdev) | |
166 | { | |
167 | struct device_node *parent, *child; | |
168 | int num = 0; | |
169 | ||
170 | of_node_get(pdev->dev.parent->of_node); | |
171 | parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators"); | |
172 | if (!parent) | |
173 | return -ENODEV; | |
174 | ||
175 | for_each_child_of_node(parent, child) | |
176 | num++; | |
177 | ||
178 | return num; | |
179 | } | |
53269163 | 180 | EXPORT_SYMBOL_GPL(mc13xxx_get_num_regulators_dt); |
93bcb23b SG |
181 | |
182 | struct mc13xxx_regulator_init_data * __devinit mc13xxx_parse_regulators_dt( | |
183 | struct platform_device *pdev, struct mc13xxx_regulator *regulators, | |
184 | int num_regulators) | |
185 | { | |
186 | struct mc13xxx_regulator_priv *priv = platform_get_drvdata(pdev); | |
187 | struct mc13xxx_regulator_init_data *data, *p; | |
188 | struct device_node *parent, *child; | |
189 | int i; | |
190 | ||
191 | of_node_get(pdev->dev.parent->of_node); | |
192 | parent = of_find_node_by_name(pdev->dev.parent->of_node, "regulators"); | |
193 | if (!parent) | |
194 | return NULL; | |
195 | ||
196 | data = devm_kzalloc(&pdev->dev, sizeof(*data) * priv->num_regulators, | |
197 | GFP_KERNEL); | |
198 | if (!data) | |
199 | return NULL; | |
200 | p = data; | |
201 | ||
202 | for_each_child_of_node(parent, child) { | |
203 | for (i = 0; i < num_regulators; i++) { | |
204 | if (!of_node_cmp(child->name, | |
205 | regulators[i].desc.name)) { | |
206 | p->id = i; | |
207 | p->init_data = of_get_regulator_init_data( | |
208 | &pdev->dev, child); | |
209 | p->node = child; | |
210 | p++; | |
211 | break; | |
212 | } | |
213 | } | |
214 | } | |
215 | ||
216 | return data; | |
217 | } | |
53269163 | 218 | EXPORT_SYMBOL_GPL(mc13xxx_parse_regulators_dt); |
93bcb23b SG |
219 | #endif |
220 | ||
167e3d8a YS |
221 | MODULE_LICENSE("GPL v2"); |
222 | MODULE_AUTHOR("Yong Shen <yong.shen@linaro.org>"); | |
223 | MODULE_DESCRIPTION("Regulator Driver for Freescale MC13xxx PMIC"); | |
224 | MODULE_ALIAS("mc13xxx-regulator-core"); |