Merge remote-tracking branch 'regulator/topic/change' into regulator-next
[linux-3.10.git] / drivers / regulator / pcf50633-regulator.c
1 /* NXP PCF50633 PMIC Driver
2  *
3  * (C) 2006-2008 by Openmoko, Inc.
4  * Author: Balaji Rao <balajirrao@openmoko.org>
5  * All rights reserved.
6  *
7  * Broken down from monstrous PCF50633 driver mainly by
8  * Harald Welte and Andy Green and Werner Almesberger
9  *
10  *  This program is free software; you can redistribute  it and/or modify it
11  *  under  the terms of  the GNU General  Public License as published by the
12  *  Free Software Foundation;  either version 2 of the  License, or (at your
13  *  option) any later version.
14  *
15  */
16
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/err.h>
22 #include <linux/platform_device.h>
23
24 #include <linux/mfd/pcf50633/core.h>
25 #include <linux/mfd/pcf50633/pmic.h>
26
27 #define PCF50633_REGULATOR(_name, _id, _n)                      \
28         {                                                       \
29                 .name = _name,                                  \
30                 .id = PCF50633_REGULATOR_##_id,                 \
31                 .ops = &pcf50633_regulator_ops,                 \
32                 .n_voltages = _n,                               \
33                 .type = REGULATOR_VOLTAGE,                      \
34                 .owner = THIS_MODULE,                           \
35                 .vsel_reg = PCF50633_REG_##_id##OUT,            \
36                 .vsel_mask = 0xff,                              \
37                 .enable_reg = PCF50633_REG_##_id##OUT + 1,      \
38                 .enable_mask = PCF50633_REGULATOR_ON,           \
39         }
40
41 /* Bits from voltage value */
42 static u8 auto_voltage_bits(unsigned int millivolts)
43 {
44         if (millivolts < 1800)
45                 return 0x2f;
46         if (millivolts > 3800)
47                 return 0xff;
48
49         millivolts -= 625;
50
51         return millivolts / 25;
52 }
53
54 static u8 down_voltage_bits(unsigned int millivolts)
55 {
56         if (millivolts < 625)
57                 return 0;
58         else if (millivolts > 3000)
59                 return 0xff;
60
61         millivolts -= 625;
62
63         return millivolts / 25;
64 }
65
66 static u8 ldo_voltage_bits(unsigned int millivolts)
67 {
68         if (millivolts < 900)
69                 return 0;
70         else if (millivolts > 3600)
71                 return 0x1f;
72
73         millivolts -= 900;
74         return millivolts / 100;
75 }
76
77 /* Obtain voltage value from bits */
78 static unsigned int auto_voltage_value(u8 bits)
79 {
80         /* AUTOOUT: 00000000 to 00101110 are reserved.
81          * Return 0 for bits in reserved range, which means this selector code
82          * can't be used on this system */
83         if (bits < 0x2f)
84                 return 0;
85
86         return 625 + (bits * 25);
87 }
88
89
90 static unsigned int down_voltage_value(u8 bits)
91 {
92         return 625 + (bits * 25);
93 }
94
95
96 static unsigned int ldo_voltage_value(u8 bits)
97 {
98         bits &= 0x1f;
99
100         return 900 + (bits * 100);
101 }
102
103 static int pcf50633_regulator_map_voltage(struct regulator_dev *rdev,
104                                           int min_uV, int max_uV)
105 {
106         struct pcf50633 *pcf;
107         int regulator_id, millivolts;
108         u8 volt_bits;
109
110         pcf = rdev_get_drvdata(rdev);
111
112         regulator_id = rdev_get_id(rdev);
113         if (regulator_id >= PCF50633_NUM_REGULATORS)
114                 return -EINVAL;
115
116         millivolts = min_uV / 1000;
117
118         switch (regulator_id) {
119         case PCF50633_REGULATOR_AUTO:
120                 volt_bits = auto_voltage_bits(millivolts);
121                 break;
122         case PCF50633_REGULATOR_DOWN1:
123         case PCF50633_REGULATOR_DOWN2:
124                 volt_bits = down_voltage_bits(millivolts);
125                 break;
126         case PCF50633_REGULATOR_LDO1:
127         case PCF50633_REGULATOR_LDO2:
128         case PCF50633_REGULATOR_LDO3:
129         case PCF50633_REGULATOR_LDO4:
130         case PCF50633_REGULATOR_LDO5:
131         case PCF50633_REGULATOR_LDO6:
132         case PCF50633_REGULATOR_HCLDO:
133         case PCF50633_REGULATOR_MEMLDO:
134                 volt_bits = ldo_voltage_bits(millivolts);
135                 break;
136         default:
137                 return -EINVAL;
138         }
139
140         return volt_bits;
141 }
142
143 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
144                                                 unsigned int index)
145 {
146         int regulator_id = rdev_get_id(rdev);
147
148         int millivolts;
149
150         switch (regulator_id) {
151         case PCF50633_REGULATOR_AUTO:
152                 millivolts = auto_voltage_value(index);
153                 break;
154         case PCF50633_REGULATOR_DOWN1:
155         case PCF50633_REGULATOR_DOWN2:
156                 millivolts = down_voltage_value(index);
157                 break;
158         case PCF50633_REGULATOR_LDO1:
159         case PCF50633_REGULATOR_LDO2:
160         case PCF50633_REGULATOR_LDO3:
161         case PCF50633_REGULATOR_LDO4:
162         case PCF50633_REGULATOR_LDO5:
163         case PCF50633_REGULATOR_LDO6:
164         case PCF50633_REGULATOR_HCLDO:
165         case PCF50633_REGULATOR_MEMLDO:
166                 millivolts = ldo_voltage_value(index);
167                 break;
168         default:
169                 return -EINVAL;
170         }
171
172         return millivolts * 1000;
173 }
174
175 static struct regulator_ops pcf50633_regulator_ops = {
176         .set_voltage_sel = regulator_set_voltage_sel_regmap,
177         .get_voltage_sel = regulator_get_voltage_sel_regmap,
178         .list_voltage = pcf50633_regulator_list_voltage,
179         .map_voltage = pcf50633_regulator_map_voltage,
180         .enable = regulator_enable_regmap,
181         .disable = regulator_disable_regmap,
182         .is_enabled = regulator_is_enabled_regmap,
183 };
184
185 static const struct regulator_desc regulators[] = {
186         [PCF50633_REGULATOR_AUTO] = PCF50633_REGULATOR("auto", AUTO, 128),
187         [PCF50633_REGULATOR_DOWN1] = PCF50633_REGULATOR("down1", DOWN1, 96),
188         [PCF50633_REGULATOR_DOWN2] = PCF50633_REGULATOR("down2", DOWN2, 96),
189         [PCF50633_REGULATOR_LDO1] = PCF50633_REGULATOR("ldo1", LDO1, 28),
190         [PCF50633_REGULATOR_LDO2] = PCF50633_REGULATOR("ldo2", LDO2, 28),
191         [PCF50633_REGULATOR_LDO3] = PCF50633_REGULATOR("ldo3", LDO3, 28),
192         [PCF50633_REGULATOR_LDO4] = PCF50633_REGULATOR("ldo4", LDO4, 28),
193         [PCF50633_REGULATOR_LDO5] = PCF50633_REGULATOR("ldo5", LDO5, 28),
194         [PCF50633_REGULATOR_LDO6] = PCF50633_REGULATOR("ldo6", LDO6, 28),
195         [PCF50633_REGULATOR_HCLDO] = PCF50633_REGULATOR("hcldo", HCLDO, 28),
196         [PCF50633_REGULATOR_MEMLDO] = PCF50633_REGULATOR("memldo", MEMLDO, 28),
197 };
198
199 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
200 {
201         struct regulator_dev *rdev;
202         struct pcf50633 *pcf;
203         struct regulator_config config = { };
204
205         /* Already set by core driver */
206         pcf = dev_to_pcf50633(pdev->dev.parent);
207
208         config.dev = &pdev->dev;
209         config.init_data = pdev->dev.platform_data;
210         config.driver_data = pcf;
211         config.regmap = pcf->regmap;
212
213         rdev = regulator_register(&regulators[pdev->id], &config);
214         if (IS_ERR(rdev))
215                 return PTR_ERR(rdev);
216
217         platform_set_drvdata(pdev, rdev);
218
219         if (pcf->pdata->regulator_registered)
220                 pcf->pdata->regulator_registered(pcf, pdev->id);
221
222         return 0;
223 }
224
225 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
226 {
227         struct regulator_dev *rdev = platform_get_drvdata(pdev);
228
229         platform_set_drvdata(pdev, NULL);
230         regulator_unregister(rdev);
231
232         return 0;
233 }
234
235 static struct platform_driver pcf50633_regulator_driver = {
236         .driver = {
237                 .name = "pcf50633-regltr",
238         },
239         .probe = pcf50633_regulator_probe,
240         .remove = __devexit_p(pcf50633_regulator_remove),
241 };
242
243 static int __init pcf50633_regulator_init(void)
244 {
245         return platform_driver_register(&pcf50633_regulator_driver);
246 }
247 subsys_initcall(pcf50633_regulator_init);
248
249 static void __exit pcf50633_regulator_exit(void)
250 {
251         platform_driver_unregister(&pcf50633_regulator_driver);
252 }
253 module_exit(pcf50633_regulator_exit);
254
255 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
256 MODULE_DESCRIPTION("PCF50633 regulator driver");
257 MODULE_LICENSE("GPL");
258 MODULE_ALIAS("platform:pcf50633-regulator");