Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / regulator / pcap-regulator.c
1 /*
2  * PCAP2 Regulator Driver
3  *
4  * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
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 u16 V1_table[] = {
22         2775, 1275, 1600, 1725, 1825, 1925, 2075, 2275,
23 };
24
25 static const u16 V2_table[] = {
26         2500, 2775,
27 };
28
29 static const u16 V3_table[] = {
30         1075, 1275, 1550, 1725, 1876, 1950, 2075, 2275,
31 };
32
33 static const u16 V4_table[] = {
34         1275, 1550, 1725, 1875, 1950, 2075, 2275, 2775,
35 };
36
37 static const u16 V5_table[] = {
38         1875, 2275, 2475, 2775,
39 };
40
41 static const u16 V6_table[] = {
42         2475, 2775,
43 };
44
45 static const u16 V7_table[] = {
46         1875, 2775,
47 };
48
49 #define V8_table V4_table
50
51 static const u16 V9_table[] = {
52         1575, 1875, 2475, 2775,
53 };
54
55 static const u16 V10_table[] = {
56         5000,
57 };
58
59 static const u16 VAUX1_table[] = {
60         1875, 2475, 2775, 3000,
61 };
62
63 #define VAUX2_table VAUX1_table
64
65 static const u16 VAUX3_table[] = {
66         1200, 1200, 1200, 1200, 1400, 1600, 1800, 2000,
67         2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600,
68 };
69
70 static const u16 VAUX4_table[] = {
71         1800, 1800, 3000, 5000,
72 };
73
74 static const u16 VSIM_table[] = {
75         1875, 3000,
76 };
77
78 static const u16 VSIM2_table[] = {
79         1875,
80 };
81
82 static const u16 VVIB_table[] = {
83         1300, 1800, 2000, 3000,
84 };
85
86 static const u16 SW1_table[] = {
87         900, 950, 1000, 1050, 1100, 1150, 1200, 1250,
88         1300, 1350, 1400, 1450, 1500, 1600, 1875, 2250,
89 };
90
91 #define SW2_table SW1_table
92
93 static const u16 SW3_table[] = {
94         4000, 4500, 5000, 5500,
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         const u8 n_voltages;
104         const u16 *voltage_table;
105 };
106
107 #define NA 0xff
108
109 #define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)             \
110         [_vreg] = {                                                     \
111                 .reg            = _reg,                                 \
112                 .en             = _en,                                  \
113                 .index          = _index,                               \
114                 .stby           = _stby,                                \
115                 .lowpwr         = _lowpwr,                              \
116                 .n_voltages     = ARRAY_SIZE(_vreg##_table),            \
117                 .voltage_table  = _vreg##_table,                        \
118         }
119
120 static struct pcap_regulator vreg_table[] = {
121         VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),
122         VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),
123         VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),
124         VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),
125         /* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
126         VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),
127
128         VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),
129         VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),
130         VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),
131         VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),
132         VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),
133
134         VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),
135         /* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
136         VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),
137         VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),
138         VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),
139         VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),
140         VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
141         VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),
142
143         VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),
144         VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),
145         /* SW3 STBY is on PCAP_REG_AUXVREG */
146         VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),
147
148         /* SWxS used to control SWx voltage on standby */
149 /*      VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),
150         VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */
151 };
152
153 static int pcap_regulator_set_voltage(struct regulator_dev *rdev,
154                                                 int min_uV, int max_uV)
155 {
156         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
157         void *pcap = rdev_get_drvdata(rdev);
158         int uV;
159         u8 i;
160
161         /* the regulator doesn't support voltage switching */
162         if (vreg->n_voltages == 1)
163                 return -EINVAL;
164
165         for (i = 0; i < vreg->n_voltages; i++) {
166                 /* For V1 the first is not the best match */
167                 if (i == 0 && rdev_get_id(rdev) == V1)
168                         i = 1;
169                 else if (i + 1 == vreg->n_voltages && rdev_get_id(rdev) == V1)
170                         i = 0;
171
172                 uV = vreg->voltage_table[i] * 1000;
173                 if (min_uV <= uV && uV <= max_uV)
174                         return ezx_pcap_set_bits(pcap, vreg->reg,
175                                         (vreg->n_voltages - 1) << vreg->index,
176                                         i << vreg->index);
177
178                 if (i == 0 && rdev_get_id(rdev) == V1)
179                         i = vreg->n_voltages - 1;
180         }
181
182         /* the requested voltage range is not supported by this regulator */
183         return -EINVAL;
184 }
185
186 static int pcap_regulator_get_voltage(struct regulator_dev *rdev)
187 {
188         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
189         void *pcap = rdev_get_drvdata(rdev);
190         u32 tmp;
191         int mV;
192
193         if (vreg->n_voltages == 1)
194                 return vreg->voltage_table[0] * 1000;
195
196         ezx_pcap_read(pcap, vreg->reg, &tmp);
197         tmp = ((tmp >> vreg->index) & (vreg->n_voltages - 1));
198         mV = vreg->voltage_table[tmp];
199
200         return mV * 1000;
201 }
202
203 static int pcap_regulator_enable(struct regulator_dev *rdev)
204 {
205         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
206         void *pcap = rdev_get_drvdata(rdev);
207
208         if (vreg->en == NA)
209                 return -EINVAL;
210
211         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
212 }
213
214 static int pcap_regulator_disable(struct regulator_dev *rdev)
215 {
216         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
217         void *pcap = rdev_get_drvdata(rdev);
218
219         if (vreg->en == NA)
220                 return -EINVAL;
221
222         return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
223 }
224
225 static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
226 {
227         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
228         void *pcap = rdev_get_drvdata(rdev);
229         u32 tmp;
230
231         if (vreg->en == NA)
232                 return -EINVAL;
233
234         ezx_pcap_read(pcap, vreg->reg, &tmp);
235         return (tmp >> vreg->en) & 1;
236 }
237
238 static int pcap_regulator_list_voltage(struct regulator_dev *rdev,
239                                                         unsigned int index)
240 {
241         struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
242
243         return vreg->voltage_table[index] * 1000;
244 }
245
246 static struct regulator_ops pcap_regulator_ops = {
247         .list_voltage   = pcap_regulator_list_voltage,
248         .set_voltage    = pcap_regulator_set_voltage,
249         .get_voltage    = pcap_regulator_get_voltage,
250         .enable         = pcap_regulator_enable,
251         .disable        = pcap_regulator_disable,
252         .is_enabled     = pcap_regulator_is_enabled,
253 };
254
255 #define VREG(_vreg)                                             \
256         [_vreg] = {                                             \
257                 .name           = #_vreg,                       \
258                 .id             = _vreg,                        \
259                 .n_voltages     = ARRAY_SIZE(_vreg##_table),    \
260                 .ops            = &pcap_regulator_ops,          \
261                 .type           = REGULATOR_VOLTAGE,            \
262                 .owner          = THIS_MODULE,                  \
263         }
264
265 static struct regulator_desc pcap_regulators[] = {
266         VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
267         VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
268         VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
269 };
270
271 static int __devinit pcap_regulator_probe(struct platform_device *pdev)
272 {
273         struct regulator_dev *rdev;
274         void *pcap = dev_get_drvdata(pdev->dev.parent);
275
276         rdev = regulator_register(&pcap_regulators[pdev->id], &pdev->dev,
277                                 pdev->dev.platform_data, pcap);
278         if (IS_ERR(rdev))
279                 return PTR_ERR(rdev);
280
281         platform_set_drvdata(pdev, rdev);
282
283         return 0;
284 }
285
286 static int __devexit pcap_regulator_remove(struct platform_device *pdev)
287 {
288         struct regulator_dev *rdev = platform_get_drvdata(pdev);
289
290         regulator_unregister(rdev);
291         platform_set_drvdata(pdev, NULL);
292
293         return 0;
294 }
295
296 static struct platform_driver pcap_regulator_driver = {
297         .driver = {
298                 .name   = "pcap-regulator",
299                 .owner  = THIS_MODULE,
300         },
301         .probe  = pcap_regulator_probe,
302         .remove = __devexit_p(pcap_regulator_remove),
303 };
304
305 static int __init pcap_regulator_init(void)
306 {
307         return platform_driver_register(&pcap_regulator_driver);
308 }
309
310 static void __exit pcap_regulator_exit(void)
311 {
312         platform_driver_unregister(&pcap_regulator_driver);
313 }
314
315 subsys_initcall(pcap_regulator_init);
316 module_exit(pcap_regulator_exit);
317
318 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
319 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
320 MODULE_LICENSE("GPL");