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Linux/drivers/regulator/as3711-regulator.c

  1 /*
  2  * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
  3  *
  4  * Copyright (C) 2012 Renesas Electronics Corporation
  5  * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the version 2 of the GNU General Public License as
  9  * published by the Free Software Foundation
 10  */
 11 
 12 #include <linux/err.h>
 13 #include <linux/init.h>
 14 #include <linux/mfd/as3711.h>
 15 #include <linux/module.h>
 16 #include <linux/of.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/regmap.h>
 19 #include <linux/regulator/driver.h>
 20 #include <linux/regulator/of_regulator.h>
 21 #include <linux/slab.h>
 22 
 23 struct as3711_regulator_info {
 24         struct regulator_desc   desc;
 25 };
 26 
 27 struct as3711_regulator {
 28         struct as3711_regulator_info *reg_info;
 29 };
 30 
 31 /*
 32  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 33  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 34  * FAST:        sdX_fast=1
 35  * NORMAL:      low_noise=1
 36  * IDLE:        low_noise=0
 37  */
 38 
 39 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
 40 {
 41         unsigned int fast_bit = rdev->desc->enable_mask,
 42                 low_noise_bit = fast_bit << 4;
 43         u8 val;
 44 
 45         switch (mode) {
 46         case REGULATOR_MODE_FAST:
 47                 val = fast_bit | low_noise_bit;
 48                 break;
 49         case REGULATOR_MODE_NORMAL:
 50                 val = low_noise_bit;
 51                 break;
 52         case REGULATOR_MODE_IDLE:
 53                 val = 0;
 54                 break;
 55         default:
 56                 return -EINVAL;
 57         }
 58 
 59         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
 60                                   low_noise_bit | fast_bit, val);
 61 }
 62 
 63 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
 64 {
 65         unsigned int fast_bit = rdev->desc->enable_mask,
 66                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
 67         unsigned int val;
 68         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
 69 
 70         if (ret < 0)
 71                 return ret;
 72 
 73         if ((val & mask) == mask)
 74                 return REGULATOR_MODE_FAST;
 75 
 76         if ((val & mask) == low_noise_bit)
 77                 return REGULATOR_MODE_NORMAL;
 78 
 79         if (!(val & mask))
 80                 return REGULATOR_MODE_IDLE;
 81 
 82         return -EINVAL;
 83 }
 84 
 85 static struct regulator_ops as3711_sd_ops = {
 86         .is_enabled             = regulator_is_enabled_regmap,
 87         .enable                 = regulator_enable_regmap,
 88         .disable                = regulator_disable_regmap,
 89         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 90         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 91         .list_voltage           = regulator_list_voltage_linear_range,
 92         .map_voltage            = regulator_map_voltage_linear_range,
 93         .get_mode               = as3711_get_mode_sd,
 94         .set_mode               = as3711_set_mode_sd,
 95 };
 96 
 97 static struct regulator_ops as3711_aldo_ops = {
 98         .is_enabled             = regulator_is_enabled_regmap,
 99         .enable                 = regulator_enable_regmap,
100         .disable                = regulator_disable_regmap,
101         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
102         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
103         .list_voltage           = regulator_list_voltage_linear_range,
104         .map_voltage            = regulator_map_voltage_linear_range,
105 };
106 
107 static struct regulator_ops as3711_dldo_ops = {
108         .is_enabled             = regulator_is_enabled_regmap,
109         .enable                 = regulator_enable_regmap,
110         .disable                = regulator_disable_regmap,
111         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
112         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
113         .list_voltage           = regulator_list_voltage_linear_range,
114         .map_voltage            = regulator_map_voltage_linear_range,
115 };
116 
117 static const struct regulator_linear_range as3711_sd_ranges[] = {
118         REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
119         REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
120         REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
121 };
122 
123 static const struct regulator_linear_range as3711_aldo_ranges[] = {
124         REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
125         REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
126 };
127 
128 static const struct regulator_linear_range as3711_dldo_ranges[] = {
129         REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
130         REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
131 };
132 
133 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _sfx)                    \
134         [AS3711_REGULATOR_ ## _id] = {                                     \
135         .desc = {                                                          \
136                 .name = "as3711-regulator-" # _id,                         \
137                 .id = AS3711_REGULATOR_ ## _id,                            \
138                 .n_voltages = (_vmask + 1),                                \
139                 .ops = &as3711_ ## _sfx ## _ops,                           \
140                 .type = REGULATOR_VOLTAGE,                                 \
141                 .owner = THIS_MODULE,                                      \
142                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                    \
143                 .vsel_mask = _vmask,                                       \
144                 .enable_reg = AS3711_ ## _en_reg,                          \
145                 .enable_mask = BIT(_en_bit),                               \
146                 .linear_ranges = as3711_ ## _sfx ## _ranges,               \
147                 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \
148         },                                                                 \
149 }
150 
151 static struct as3711_regulator_info as3711_reg_info[] = {
152         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, sd),
153         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, sd),
154         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, sd),
155         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, sd),
156         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, aldo),
157         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, aldo),
158         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, dldo),
159         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, dldo),
160         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, dldo),
161         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, dldo),
162         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, dldo),
163         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, dldo),
164         /* StepUp output voltage depends on supplying regulator */
165 };
166 
167 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
168 
169 static struct of_regulator_match
170 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
171         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
172         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
173         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
174         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
175         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
176         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
177         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
178         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
179         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
180         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
181         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
182         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
183 };
184 
185 static int as3711_regulator_parse_dt(struct device *dev,
186                                 struct device_node **of_node, const int count)
187 {
188         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
189         struct device_node *regulators =
190                 of_get_child_by_name(dev->parent->of_node, "regulators");
191         struct of_regulator_match *match;
192         int ret, i;
193 
194         if (!regulators) {
195                 dev_err(dev, "regulator node not found\n");
196                 return -ENODEV;
197         }
198 
199         ret = of_regulator_match(dev->parent, regulators,
200                                  as3711_regulator_matches, count);
201         of_node_put(regulators);
202         if (ret < 0) {
203                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
204                 return ret;
205         }
206 
207         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
208                 if (match->of_node) {
209                         pdata->init_data[i] = match->init_data;
210                         of_node[i] = match->of_node;
211                 }
212 
213         return 0;
214 }
215 
216 static int as3711_regulator_probe(struct platform_device *pdev)
217 {
218         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
219         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
220         struct regulator_config config = {.dev = &pdev->dev,};
221         struct as3711_regulator *reg = NULL;
222         struct as3711_regulator *regs;
223         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
224         struct regulator_dev *rdev;
225         struct as3711_regulator_info *ri;
226         int ret;
227         int id;
228 
229         if (!pdata) {
230                 dev_err(&pdev->dev, "No platform data...\n");
231                 return -ENODEV;
232         }
233 
234         if (pdev->dev.parent->of_node) {
235                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
236                 if (ret < 0) {
237                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
238                         return ret;
239                 }
240         }
241 
242         regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
243                         sizeof(struct as3711_regulator), GFP_KERNEL);
244         if (!regs)
245                 return -ENOMEM;
246 
247         for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
248                 reg = &regs[id];
249                 reg->reg_info = ri;
250 
251                 config.init_data = pdata->init_data[id];
252                 config.driver_data = reg;
253                 config.regmap = as3711->regmap;
254                 config.of_node = of_node[id];
255 
256                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
257                 if (IS_ERR(rdev)) {
258                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
259                                 ri->desc.name);
260                         return PTR_ERR(rdev);
261                 }
262         }
263         platform_set_drvdata(pdev, regs);
264         return 0;
265 }
266 
267 static struct platform_driver as3711_regulator_driver = {
268         .driver = {
269                 .name   = "as3711-regulator",
270                 .owner  = THIS_MODULE,
271         },
272         .probe          = as3711_regulator_probe,
273 };
274 
275 static int __init as3711_regulator_init(void)
276 {
277         return platform_driver_register(&as3711_regulator_driver);
278 }
279 subsys_initcall(as3711_regulator_init);
280 
281 static void __exit as3711_regulator_exit(void)
282 {
283         platform_driver_unregister(&as3711_regulator_driver);
284 }
285 module_exit(as3711_regulator_exit);
286 
287 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
288 MODULE_DESCRIPTION("AS3711 regulator driver");
289 MODULE_ALIAS("platform:as3711-regulator");
290 MODULE_LICENSE("GPL v2");
291 

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