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pcap-regulator.c
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1 /*
2  * PCAP2 Regulator Driver
3  *
4  * Copyright (c) 2009 Daniel Ribeiro <[email protected]>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; either version 2 of the License, or (at your
9  * option) any later version.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/mfd/ezx-pcap.h>
20 
21 static const unsigned int V1_table[] = {
22  2775000, 1275000, 1600000, 1725000, 1825000, 1925000, 2075000, 2275000,
23 };
24 
25 static const unsigned int V2_table[] = {
26  2500000, 2775000,
27 };
28 
29 static const unsigned int V3_table[] = {
30  1075000, 1275000, 1550000, 1725000, 1876000, 1950000, 2075000, 2275000,
31 };
32 
33 static const unsigned int V4_table[] = {
34  1275000, 1550000, 1725000, 1875000, 1950000, 2075000, 2275000, 2775000,
35 };
36 
37 static const unsigned int V5_table[] = {
38  1875000, 2275000, 2475000, 2775000,
39 };
40 
41 static const unsigned int V6_table[] = {
42  2475000, 2775000,
43 };
44 
45 static const unsigned int V7_table[] = {
46  1875000, 2775000,
47 };
48 
49 #define V8_table V4_table
50 
51 static const unsigned int V9_table[] = {
52  1575000, 1875000, 2475000, 2775000,
53 };
54 
55 static const unsigned int V10_table[] = {
56  5000000,
57 };
58 
59 static const unsigned int VAUX1_table[] = {
60  1875000, 2475000, 2775000, 3000000,
61 };
62 
63 #define VAUX2_table VAUX1_table
64 
65 static const unsigned int VAUX3_table[] = {
66  1200000, 1200000, 1200000, 1200000, 1400000, 1600000, 1800000, 2000000,
67  2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, 3600000,
68 };
69 
70 static const unsigned int VAUX4_table[] = {
71  1800000, 1800000, 3000000, 5000000,
72 };
73 
74 static const unsigned int VSIM_table[] = {
75  1875000, 3000000,
76 };
77 
78 static const unsigned int VSIM2_table[] = {
79  1875000,
80 };
81 
82 static const unsigned int VVIB_table[] = {
83  1300000, 1800000, 2000000, 3000000,
84 };
85 
86 static const unsigned int SW1_table[] = {
87  900000, 950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000,
88  1300000, 1350000, 1400000, 1450000, 1500000, 1600000, 1875000, 2250000,
89 };
90 
91 #define SW2_table SW1_table
92 
93 static const unsigned int SW3_table[] = {
94  4000000, 4500000, 5000000, 5500000,
95 };
96 
97 struct pcap_regulator {
98  const u8 reg;
99  const u8 en;
100  const u8 index;
101  const u8 stby;
102  const u8 lowpwr;
103 };
104 
105 #define NA 0xff
106 
107 #define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr) \
108  [_vreg] = { \
109  .reg = _reg, \
110  .en = _en, \
111  .index = _index, \
112  .stby = _stby, \
113  .lowpwr = _lowpwr, \
114  }
115 
116 static struct pcap_regulator vreg_table[] = {
117  VREG_INFO(V1, PCAP_REG_VREG1, 1, 2, 18, 0),
118  VREG_INFO(V2, PCAP_REG_VREG1, 5, 6, 19, 22),
119  VREG_INFO(V3, PCAP_REG_VREG1, 7, 8, 20, 23),
120  VREG_INFO(V4, PCAP_REG_VREG1, 11, 12, 21, 24),
121  /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
122  VREG_INFO(V5, PCAP_REG_VREG1, 15, 16, 12, 19),
123 
124  VREG_INFO(V6, PCAP_REG_VREG2, 1, 2, 14, 20),
125  VREG_INFO(V7, PCAP_REG_VREG2, 3, 4, 15, 21),
126  VREG_INFO(V8, PCAP_REG_VREG2, 5, 6, 16, 22),
127  VREG_INFO(V9, PCAP_REG_VREG2, 9, 10, 17, 23),
128  VREG_INFO(V10, PCAP_REG_VREG2, 10, NA, 18, 24),
129 
130  VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1, 2, 22, 23),
131  /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
132  VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4, 5, 0, 1),
133  VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7, 8, 2, 3),
134  VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4, 5),
135  VREG_INFO(VSIM, PCAP_REG_AUXVREG, 17, 18, NA, 6),
136  VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
137  VREG_INFO(VVIB, PCAP_REG_AUXVREG, 19, 20, NA, NA),
138 
139  VREG_INFO(SW1, PCAP_REG_SWCTRL, 1, 2, NA, NA),
140  VREG_INFO(SW2, PCAP_REG_SWCTRL, 6, 7, NA, NA),
141  /* SW3 STBY is on PCAP_REG_AUXVREG */
142  VREG_INFO(SW3, PCAP_REG_SWCTRL, 11, 12, 24, NA),
143 
144  /* SWxS used to control SWx voltage on standby */
145 /* VREG_INFO(SW1S, PCAP_REG_LOWPWR, NA, 12, NA, NA),
146  VREG_INFO(SW2S, PCAP_REG_LOWPWR, NA, 20, NA, NA), */
147 };
148 
149 static int pcap_regulator_set_voltage_sel(struct regulator_dev *rdev,
150  unsigned selector)
151 {
152  struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
153  void *pcap = rdev_get_drvdata(rdev);
154 
155  /* the regulator doesn't support voltage switching */
156  if (rdev->desc->n_voltages == 1)
157  return -EINVAL;
158 
159  return ezx_pcap_set_bits(pcap, vreg->reg,
160  (rdev->desc->n_voltages - 1) << vreg->index,
161  selector << vreg->index);
162 }
163 
164 static int pcap_regulator_get_voltage_sel(struct regulator_dev *rdev)
165 {
166  struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
167  void *pcap = rdev_get_drvdata(rdev);
168  u32 tmp;
169 
170  if (rdev->desc->n_voltages == 1)
171  return 0;
172 
173  ezx_pcap_read(pcap, vreg->reg, &tmp);
174  tmp = ((tmp >> vreg->index) & (rdev->desc->n_voltages - 1));
175  return tmp;
176 }
177 
178 static int pcap_regulator_enable(struct regulator_dev *rdev)
179 {
180  struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
181  void *pcap = rdev_get_drvdata(rdev);
182 
183  if (vreg->en == NA)
184  return -EINVAL;
185 
186  return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
187 }
188 
189 static int pcap_regulator_disable(struct regulator_dev *rdev)
190 {
191  struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
192  void *pcap = rdev_get_drvdata(rdev);
193 
194  if (vreg->en == NA)
195  return -EINVAL;
196 
197  return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
198 }
199 
200 static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
201 {
202  struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
203  void *pcap = rdev_get_drvdata(rdev);
204  u32 tmp;
205 
206  if (vreg->en == NA)
207  return -EINVAL;
208 
209  ezx_pcap_read(pcap, vreg->reg, &tmp);
210  return (tmp >> vreg->en) & 1;
211 }
212 
213 static struct regulator_ops pcap_regulator_ops = {
214  .list_voltage = regulator_list_voltage_table,
215  .set_voltage_sel = pcap_regulator_set_voltage_sel,
216  .get_voltage_sel = pcap_regulator_get_voltage_sel,
217  .enable = pcap_regulator_enable,
218  .disable = pcap_regulator_disable,
219  .is_enabled = pcap_regulator_is_enabled,
220 };
221 
222 #define VREG(_vreg) \
223  [_vreg] = { \
224  .name = #_vreg, \
225  .id = _vreg, \
226  .n_voltages = ARRAY_SIZE(_vreg##_table), \
227  .volt_table = _vreg##_table, \
228  .ops = &pcap_regulator_ops, \
229  .type = REGULATOR_VOLTAGE, \
230  .owner = THIS_MODULE, \
231  }
232 
233 static const struct regulator_desc pcap_regulators[] = {
234  VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
235  VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
236  VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
237 };
238 
239 static int __devinit pcap_regulator_probe(struct platform_device *pdev)
240 {
241  struct regulator_dev *rdev;
242  void *pcap = dev_get_drvdata(pdev->dev.parent);
243  struct regulator_config config = { };
244 
245  config.dev = &pdev->dev;
246  config.init_data = pdev->dev.platform_data;
247  config.driver_data = pcap;
248 
249  rdev = regulator_register(&pcap_regulators[pdev->id], &config);
250  if (IS_ERR(rdev))
251  return PTR_ERR(rdev);
252 
253  platform_set_drvdata(pdev, rdev);
254 
255  return 0;
256 }
257 
258 static int __devexit pcap_regulator_remove(struct platform_device *pdev)
259 {
260  struct regulator_dev *rdev = platform_get_drvdata(pdev);
261 
262  regulator_unregister(rdev);
263  platform_set_drvdata(pdev, NULL);
264 
265  return 0;
266 }
267 
268 static struct platform_driver pcap_regulator_driver = {
269  .driver = {
270  .name = "pcap-regulator",
271  .owner = THIS_MODULE,
272  },
273  .probe = pcap_regulator_probe,
274  .remove = __devexit_p(pcap_regulator_remove),
275 };
276 
277 static int __init pcap_regulator_init(void)
278 {
279  return platform_driver_register(&pcap_regulator_driver);
280 }
281 
282 static void __exit pcap_regulator_exit(void)
283 {
284  platform_driver_unregister(&pcap_regulator_driver);
285 }
286 
287 subsys_initcall(pcap_regulator_init);
288 module_exit(pcap_regulator_exit);
289 
290 MODULE_AUTHOR("Daniel Ribeiro <[email protected]>");
291 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
292 MODULE_LICENSE("GPL");
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