regulator: lp8788-buck: Kill _gpio_request function
[linux-3.10.git] / drivers / regulator / da9052-regulator.c
1 /*
2 * da9052-regulator.c: Regulator driver for DA9052
3 *
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 */
14
15 #include <linux/module.h>
16 #include <linux/moduleparam.h>
17 #include <linux/init.h>
18 #include <linux/err.h>
19 #include <linux/platform_device.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
22 #ifdef CONFIG_OF
23 #include <linux/of.h>
24 #include <linux/regulator/of_regulator.h>
25 #endif
26
27 #include <linux/mfd/da9052/da9052.h>
28 #include <linux/mfd/da9052/reg.h>
29 #include <linux/mfd/da9052/pdata.h>
30
31 /* Buck step size */
32 #define DA9052_BUCK_PERI_3uV_STEP               100000
33 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV       24
34 #define DA9052_CONST_3uV                        3000000
35
36 #define DA9052_MIN_UA           0
37 #define DA9052_MAX_UA           3
38 #define DA9052_CURRENT_RANGE    4
39
40 /* Bit masks */
41 #define DA9052_BUCK_ILIM_MASK_EVEN      0x0c
42 #define DA9052_BUCK_ILIM_MASK_ODD       0xc0
43
44 /* DA9052 REGULATOR IDs */
45 #define DA9052_ID_BUCK1         0
46 #define DA9052_ID_BUCK2         1
47 #define DA9052_ID_BUCK3         2
48 #define DA9052_ID_BUCK4         3
49 #define DA9052_ID_LDO1          4
50 #define DA9052_ID_LDO2          5
51 #define DA9052_ID_LDO3          6
52 #define DA9052_ID_LDO4          7
53 #define DA9052_ID_LDO5          8
54 #define DA9052_ID_LDO6          9
55 #define DA9052_ID_LDO7          10
56 #define DA9052_ID_LDO8          11
57 #define DA9052_ID_LDO9          12
58 #define DA9052_ID_LDO10         13
59
60 static const u32 da9052_current_limits[3][4] = {
61         {700000, 800000, 1000000, 1200000},     /* DA9052-BC BUCKs */
62         {1600000, 2000000, 2400000, 3000000},   /* DA9053-AA/Bx BUCK-CORE */
63         {800000, 1000000, 1200000, 1500000},    /* DA9053-AA/Bx BUCK-PRO,
64                                                  * BUCK-MEM and BUCK-PERI
65                                                 */
66 };
67
68 struct da9052_regulator_info {
69         struct regulator_desc reg_desc;
70         int step_uV;
71         int min_uV;
72         int max_uV;
73         unsigned char activate_bit;
74 };
75
76 struct da9052_regulator {
77         struct da9052 *da9052;
78         struct da9052_regulator_info *info;
79         struct regulator_dev *rdev;
80 };
81
82 static int verify_range(struct da9052_regulator_info *info,
83                          int min_uV, int max_uV)
84 {
85         if (min_uV > info->max_uV || max_uV < info->min_uV)
86                 return -EINVAL;
87
88         return 0;
89 }
90
91 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev)
92 {
93         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
94         int offset = rdev_get_id(rdev);
95         int ret, row = 2;
96
97         ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2);
98         if (ret < 0)
99                 return ret;
100
101         /* Determine the even or odd position of the buck current limit
102          * register field
103         */
104         if (offset % 2 == 0)
105                 ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2;
106         else
107                 ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6;
108
109         /* Select the appropriate current limit range */
110         if (regulator->da9052->chip_id == DA9052)
111                 row = 0;
112         else if (offset == 0)
113                 row = 1;
114
115         return da9052_current_limits[row][ret];
116 }
117
118 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA,
119                                           int max_uA)
120 {
121         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
122         int offset = rdev_get_id(rdev);
123         int reg_val = 0;
124         int i, row = 2;
125
126         /* Select the appropriate current limit range */
127         if (regulator->da9052->chip_id == DA9052)
128                 row = 0;
129         else if (offset == 0)
130                 row = 1;
131
132         if (min_uA > da9052_current_limits[row][DA9052_MAX_UA] ||
133             max_uA < da9052_current_limits[row][DA9052_MIN_UA])
134                 return -EINVAL;
135
136         for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) {
137                 if (da9052_current_limits[row][i] <= max_uA) {
138                         reg_val = i;
139                         break;
140                 }
141         }
142
143         /* Determine the even or odd position of the buck current limit
144          * register field
145         */
146         if (offset % 2 == 0)
147                 return da9052_reg_update(regulator->da9052,
148                                          DA9052_BUCKA_REG + offset/2,
149                                          DA9052_BUCK_ILIM_MASK_EVEN,
150                                          reg_val << 2);
151         else
152                 return da9052_reg_update(regulator->da9052,
153                                          DA9052_BUCKA_REG + offset/2,
154                                          DA9052_BUCK_ILIM_MASK_ODD,
155                                          reg_val << 6);
156 }
157
158 static int da9052_list_voltage(struct regulator_dev *rdev,
159                                 unsigned int selector)
160 {
161         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
162         struct da9052_regulator_info *info = regulator->info;
163         int id = rdev_get_id(rdev);
164         int volt_uV;
165
166         if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
167                 && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) {
168                 volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV)
169                           + info->min_uV);
170                 volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)
171                                     * (DA9052_BUCK_PERI_3uV_STEP);
172         } else {
173                 volt_uV = (selector * info->step_uV) + info->min_uV;
174         }
175
176         if (volt_uV > info->max_uV)
177                 return -EINVAL;
178
179         return volt_uV;
180 }
181
182 static int da9052_map_voltage(struct regulator_dev *rdev,
183                               int min_uV, int max_uV)
184 {
185         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
186         struct da9052_regulator_info *info = regulator->info;
187         int id = rdev_get_id(rdev);
188         int ret, sel;
189
190         ret = verify_range(info, min_uV, max_uV);
191         if (ret < 0)
192                 return ret;
193
194         if (min_uV < info->min_uV)
195                 min_uV = info->min_uV;
196
197         if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052)
198                 && (min_uV >= DA9052_CONST_3uV)) {
199                         sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV +
200                               DIV_ROUND_UP(min_uV - DA9052_CONST_3uV,
201                                            DA9052_BUCK_PERI_3uV_STEP);
202         } else {
203                 sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
204         }
205
206         ret = da9052_list_voltage(rdev, sel);
207         if (ret < 0)
208                 return ret;
209
210         return sel;
211 }
212
213 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev,
214                                             unsigned int selector)
215 {
216         struct da9052_regulator *regulator = rdev_get_drvdata(rdev);
217         struct da9052_regulator_info *info = regulator->info;
218         int id = rdev_get_id(rdev);
219         int ret;
220
221         ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg,
222                                 rdev->desc->vsel_mask, selector);
223         if (ret < 0)
224                 return ret;
225
226         /* Some LDOs and DCDCs are DVC controlled which requires enabling of
227          * the activate bit to implment the changes on the output.
228          */
229         switch (id) {
230         case DA9052_ID_BUCK1:
231         case DA9052_ID_BUCK2:
232         case DA9052_ID_BUCK3:
233         case DA9052_ID_LDO2:
234         case DA9052_ID_LDO3:
235                 ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG,
236                                         info->activate_bit, info->activate_bit);
237                 break;
238         }
239
240         return ret;
241 }
242
243 static struct regulator_ops da9052_dcdc_ops = {
244         .get_current_limit = da9052_dcdc_get_current_limit,
245         .set_current_limit = da9052_dcdc_set_current_limit,
246
247         .list_voltage = da9052_list_voltage,
248         .map_voltage = da9052_map_voltage,
249         .get_voltage_sel = regulator_get_voltage_sel_regmap,
250         .set_voltage_sel = da9052_regulator_set_voltage_sel,
251         .is_enabled = regulator_is_enabled_regmap,
252         .enable = regulator_enable_regmap,
253         .disable = regulator_disable_regmap,
254 };
255
256 static struct regulator_ops da9052_ldo_ops = {
257         .list_voltage = da9052_list_voltage,
258         .map_voltage = da9052_map_voltage,
259         .get_voltage_sel = regulator_get_voltage_sel_regmap,
260         .set_voltage_sel = da9052_regulator_set_voltage_sel,
261         .is_enabled = regulator_is_enabled_regmap,
262         .enable = regulator_enable_regmap,
263         .disable = regulator_disable_regmap,
264 };
265
266 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \
267 {\
268         .reg_desc = {\
269                 .name = #_id,\
270                 .ops = &da9052_ldo_ops,\
271                 .type = REGULATOR_VOLTAGE,\
272                 .id = DA9052_ID_##_id,\
273                 .n_voltages = (max - min) / step + 1, \
274                 .owner = THIS_MODULE,\
275                 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
276                 .vsel_mask = (1 << (sbits)) - 1,\
277                 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
278                 .enable_mask = 1 << (ebits),\
279         },\
280         .min_uV = (min) * 1000,\
281         .max_uV = (max) * 1000,\
282         .step_uV = (step) * 1000,\
283         .activate_bit = (abits),\
284 }
285
286 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \
287 {\
288         .reg_desc = {\
289                 .name = #_id,\
290                 .ops = &da9052_dcdc_ops,\
291                 .type = REGULATOR_VOLTAGE,\
292                 .id = DA9052_ID_##_id,\
293                 .n_voltages = (max - min) / step + 1, \
294                 .owner = THIS_MODULE,\
295                 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
296                 .vsel_mask = (1 << (sbits)) - 1,\
297                 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \
298                 .enable_mask = 1 << (ebits),\
299         },\
300         .min_uV = (min) * 1000,\
301         .max_uV = (max) * 1000,\
302         .step_uV = (step) * 1000,\
303         .activate_bit = (abits),\
304 }
305
306 static struct da9052_regulator_info da9052_regulator_info[] = {
307         DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
308         DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
309         DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
310         DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0),
311         DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
312         DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
313         DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
314         DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
315         DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
316         DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
317         DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
318         DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
319         DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
320         DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
321 };
322
323 static struct da9052_regulator_info da9053_regulator_info[] = {
324         DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO),
325         DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO),
326         DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO),
327         DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0),
328         DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0),
329         DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO),
330         DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO),
331         DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0),
332         DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0),
333         DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0),
334         DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0),
335         DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0),
336         DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0),
337         DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0),
338 };
339
340 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id,
341                                                                  int id)
342 {
343         struct da9052_regulator_info *info;
344         int i;
345
346         switch (chip_id) {
347         case DA9052:
348                 for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) {
349                         info = &da9052_regulator_info[i];
350                         if (info->reg_desc.id == id)
351                                 return info;
352                 }
353                 break;
354         case DA9053_AA:
355         case DA9053_BA:
356         case DA9053_BB:
357                 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) {
358                         info = &da9053_regulator_info[i];
359                         if (info->reg_desc.id == id)
360                                 return info;
361                 }
362                 break;
363         }
364
365         return NULL;
366 }
367
368 static int __devinit da9052_regulator_probe(struct platform_device *pdev)
369 {
370         struct regulator_config config = { };
371         struct da9052_regulator *regulator;
372         struct da9052 *da9052;
373         struct da9052_pdata *pdata;
374
375         regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator),
376                                  GFP_KERNEL);
377         if (!regulator)
378                 return -ENOMEM;
379
380         da9052 = dev_get_drvdata(pdev->dev.parent);
381         pdata = da9052->dev->platform_data;
382         regulator->da9052 = da9052;
383
384         regulator->info = find_regulator_info(regulator->da9052->chip_id,
385                                               pdev->id);
386         if (regulator->info == NULL) {
387                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
388                 return -EINVAL;
389         }
390
391         config.dev = &pdev->dev;
392         config.driver_data = regulator;
393         config.regmap = da9052->regmap;
394         if (pdata && pdata->regulators) {
395                 config.init_data = pdata->regulators[pdev->id];
396         } else {
397 #ifdef CONFIG_OF
398                 struct device_node *nproot = da9052->dev->of_node;
399                 struct device_node *np;
400
401                 if (!nproot)
402                         return -ENODEV;
403
404                 nproot = of_find_node_by_name(nproot, "regulators");
405                 if (!nproot)
406                         return -ENODEV;
407
408                 for_each_child_of_node(nproot, np) {
409                         if (!of_node_cmp(np->name,
410                                          regulator->info->reg_desc.name)) {
411                                 config.init_data = of_get_regulator_init_data(
412                                         &pdev->dev, np);
413                                 config.of_node = np;
414                                 break;
415                         }
416                 }
417 #endif
418         }
419
420         regulator->rdev = regulator_register(&regulator->info->reg_desc,
421                                              &config);
422         if (IS_ERR(regulator->rdev)) {
423                 dev_err(&pdev->dev, "failed to register regulator %s\n",
424                         regulator->info->reg_desc.name);
425                 return PTR_ERR(regulator->rdev);
426         }
427
428         platform_set_drvdata(pdev, regulator);
429
430         return 0;
431 }
432
433 static int __devexit da9052_regulator_remove(struct platform_device *pdev)
434 {
435         struct da9052_regulator *regulator = platform_get_drvdata(pdev);
436
437         regulator_unregister(regulator->rdev);
438         return 0;
439 }
440
441 static struct platform_driver da9052_regulator_driver = {
442         .probe = da9052_regulator_probe,
443         .remove = __devexit_p(da9052_regulator_remove),
444         .driver = {
445                 .name = "da9052-regulator",
446                 .owner = THIS_MODULE,
447         },
448 };
449
450 static int __init da9052_regulator_init(void)
451 {
452         return platform_driver_register(&da9052_regulator_driver);
453 }
454 subsys_initcall(da9052_regulator_init);
455
456 static void __exit da9052_regulator_exit(void)
457 {
458         platform_driver_unregister(&da9052_regulator_driver);
459 }
460 module_exit(da9052_regulator_exit);
461
462 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
463 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC");
464 MODULE_LICENSE("GPL");
465 MODULE_ALIAS("platform:da9052-regulator");