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pcf50633-regulator.c
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1 /* NXP PCF50633 PMIC Driver
2  *
3  * (C) 2006-2008 by Openmoko, Inc.
4  * Author: Balaji Rao <[email protected]>
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 <[email protected]>");
256 MODULE_DESCRIPTION("PCF50633 regulator driver");
257 MODULE_LICENSE("GPL");
258 MODULE_ALIAS("platform:pcf50633-regulator");
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