Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

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         unsigned int            max_uV;
 26 };
 27 
 28 struct as3711_regulator {
 29         struct as3711_regulator_info *reg_info;
 30         struct regulator_dev *rdev;
 31 };
 32 
 33 /*
 34  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 35  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 36  * FAST:        sdX_fast=1
 37  * NORMAL:      low_noise=1
 38  * IDLE:        low_noise=0
 39  */
 40 
 41 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
 42 {
 43         unsigned int fast_bit = rdev->desc->enable_mask,
 44                 low_noise_bit = fast_bit << 4;
 45         u8 val;
 46 
 47         switch (mode) {
 48         case REGULATOR_MODE_FAST:
 49                 val = fast_bit | low_noise_bit;
 50                 break;
 51         case REGULATOR_MODE_NORMAL:
 52                 val = low_noise_bit;
 53                 break;
 54         case REGULATOR_MODE_IDLE:
 55                 val = 0;
 56                 break;
 57         default:
 58                 return -EINVAL;
 59         }
 60 
 61         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
 62                                   low_noise_bit | fast_bit, val);
 63 }
 64 
 65 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
 66 {
 67         unsigned int fast_bit = rdev->desc->enable_mask,
 68                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
 69         unsigned int val;
 70         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
 71 
 72         if (ret < 0)
 73                 return ret;
 74 
 75         if ((val & mask) == mask)
 76                 return REGULATOR_MODE_FAST;
 77 
 78         if ((val & mask) == low_noise_bit)
 79                 return REGULATOR_MODE_NORMAL;
 80 
 81         if (!(val & mask))
 82                 return REGULATOR_MODE_IDLE;
 83 
 84         return -EINVAL;
 85 }
 86 
 87 static struct regulator_ops as3711_sd_ops = {
 88         .is_enabled             = regulator_is_enabled_regmap,
 89         .enable                 = regulator_enable_regmap,
 90         .disable                = regulator_disable_regmap,
 91         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 92         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 93         .list_voltage           = regulator_list_voltage_linear_range,
 94         .map_voltage            = regulator_map_voltage_linear_range,
 95         .get_mode               = as3711_get_mode_sd,
 96         .set_mode               = as3711_set_mode_sd,
 97 };
 98 
 99 static struct regulator_ops as3711_aldo_ops = {
100         .is_enabled             = regulator_is_enabled_regmap,
101         .enable                 = regulator_enable_regmap,
102         .disable                = regulator_disable_regmap,
103         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
104         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
105         .list_voltage           = regulator_list_voltage_linear_range,
106         .map_voltage            = regulator_map_voltage_linear_range,
107 };
108 
109 static struct regulator_ops as3711_dldo_ops = {
110         .is_enabled             = regulator_is_enabled_regmap,
111         .enable                 = regulator_enable_regmap,
112         .disable                = regulator_disable_regmap,
113         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
114         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
115         .list_voltage           = regulator_list_voltage_linear_range,
116         .map_voltage            = regulator_map_voltage_linear_range,
117 };
118 
119 static const struct regulator_linear_range as3711_sd_ranges[] = {
120         REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500),
121         REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000),
122         REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000),
123 };
124 
125 static const struct regulator_linear_range as3711_aldo_ranges[] = {
126         REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000),
127         REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000),
128 };
129 
130 static const struct regulator_linear_range as3711_dldo_ranges[] = {
131         REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000),
132         REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000),
133 };
134 
135 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)      \
136         [AS3711_REGULATOR_ ## _id] = {                                                  \
137         .desc = {                                                                       \
138                 .name = "as3711-regulator-" # _id,                                      \
139                 .id = AS3711_REGULATOR_ ## _id,                                         \
140                 .n_voltages = (_vmask + 1),                                             \
141                 .ops = &as3711_ ## _sfx ## _ops,                                        \
142                 .type = REGULATOR_VOLTAGE,                                              \
143                 .owner = THIS_MODULE,                                                   \
144                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                                 \
145                 .vsel_mask = _vmask << _vshift,                                         \
146                 .enable_reg = AS3711_ ## _en_reg,                                       \
147                 .enable_mask = BIT(_en_bit),                                            \
148                 .min_uV = _min_uV,                                                      \
149                 .linear_ranges = as3711_ ## _sfx ## _ranges,                            \
150                 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges),              \
151         },                                                                              \
152         .max_uV = _max_uV,                                                              \
153 }
154 
155 static struct as3711_regulator_info as3711_reg_info[] = {
156         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
157         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
158         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
159         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
160         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
161         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
162         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
163         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
164         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
165         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
166         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
167         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
168         /* StepUp output voltage depends on supplying regulator */
169 };
170 
171 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
172 
173 static struct of_regulator_match
174 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
175         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
176         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
177         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
178         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
179         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
180         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
181         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
182         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
183         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
184         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
185         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
186         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
187 };
188 
189 static int as3711_regulator_parse_dt(struct device *dev,
190                                 struct device_node **of_node, const int count)
191 {
192         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
193         struct device_node *regulators =
194                 of_get_child_by_name(dev->parent->of_node, "regulators");
195         struct of_regulator_match *match;
196         int ret, i;
197 
198         if (!regulators) {
199                 dev_err(dev, "regulator node not found\n");
200                 return -ENODEV;
201         }
202 
203         ret = of_regulator_match(dev->parent, regulators,
204                                  as3711_regulator_matches, count);
205         of_node_put(regulators);
206         if (ret < 0) {
207                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
208                 return ret;
209         }
210 
211         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
212                 if (match->of_node) {
213                         pdata->init_data[i] = match->init_data;
214                         of_node[i] = match->of_node;
215                 }
216 
217         return 0;
218 }
219 
220 static int as3711_regulator_probe(struct platform_device *pdev)
221 {
222         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
223         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
224         struct regulator_config config = {.dev = &pdev->dev,};
225         struct as3711_regulator *reg = NULL;
226         struct as3711_regulator *regs;
227         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
228         struct regulator_dev *rdev;
229         struct as3711_regulator_info *ri;
230         int ret;
231         int id;
232 
233         if (!pdata) {
234                 dev_err(&pdev->dev, "No platform data...\n");
235                 return -ENODEV;
236         }
237 
238         if (pdev->dev.parent->of_node) {
239                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
240                 if (ret < 0) {
241                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
242                         return ret;
243                 }
244         }
245 
246         regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
247                         sizeof(struct as3711_regulator), GFP_KERNEL);
248         if (!regs)
249                 return -ENOMEM;
250 
251         for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
252                 reg = &regs[id];
253                 reg->reg_info = ri;
254 
255                 config.init_data = pdata->init_data[id];
256                 config.driver_data = reg;
257                 config.regmap = as3711->regmap;
258                 config.of_node = of_node[id];
259 
260                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
261                 if (IS_ERR(rdev)) {
262                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
263                                 ri->desc.name);
264                         return PTR_ERR(rdev);
265                 }
266                 reg->rdev = rdev;
267         }
268         platform_set_drvdata(pdev, regs);
269         return 0;
270 }
271 
272 static struct platform_driver as3711_regulator_driver = {
273         .driver = {
274                 .name   = "as3711-regulator",
275                 .owner  = THIS_MODULE,
276         },
277         .probe          = as3711_regulator_probe,
278 };
279 
280 static int __init as3711_regulator_init(void)
281 {
282         return platform_driver_register(&as3711_regulator_driver);
283 }
284 subsys_initcall(as3711_regulator_init);
285 
286 static void __exit as3711_regulator_exit(void)
287 {
288         platform_driver_unregister(&as3711_regulator_driver);
289 }
290 module_exit(as3711_regulator_exit);
291 
292 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
293 MODULE_DESCRIPTION("AS3711 regulator driver");
294 MODULE_ALIAS("platform:as3711-regulator");
295 MODULE_LICENSE("GPL v2");
296 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us