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Linux/drivers/regulator/arizona-ldo1.c

  1 /*
  2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
  3  *
  4  * Copyright 2012 Wolfson Microelectronics PLC.
  5  *
  6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  7  *
  8  *  This program is free software; you can redistribute  it and/or modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/moduleparam.h>
 16 #include <linux/init.h>
 17 #include <linux/bitops.h>
 18 #include <linux/err.h>
 19 #include <linux/of.h>
 20 #include <linux/of_gpio.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/regulator/driver.h>
 23 #include <linux/regulator/machine.h>
 24 #include <linux/regulator/of_regulator.h>
 25 #include <linux/gpio.h>
 26 #include <linux/slab.h>
 27 
 28 #include <linux/mfd/arizona/core.h>
 29 #include <linux/mfd/arizona/pdata.h>
 30 #include <linux/mfd/arizona/registers.h>
 31 
 32 struct arizona_ldo1 {
 33         struct regulator_dev *regulator;
 34         struct arizona *arizona;
 35 
 36         struct regulator_consumer_supply supply;
 37         struct regulator_init_data init_data;
 38 };
 39 
 40 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
 41                                         unsigned int selector)
 42 {
 43         if (selector >= rdev->desc->n_voltages)
 44                 return -EINVAL;
 45 
 46         if (selector == rdev->desc->n_voltages - 1)
 47                 return 1800000;
 48         else
 49                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
 50 }
 51 
 52 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
 53                                        int min_uV, int max_uV)
 54 {
 55         int sel;
 56 
 57         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
 58         if (sel >= rdev->desc->n_voltages)
 59                 sel = rdev->desc->n_voltages - 1;
 60 
 61         return sel;
 62 }
 63 
 64 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
 65                                            unsigned sel)
 66 {
 67         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
 68         struct regmap *regmap = ldo->arizona->regmap;
 69         unsigned int val;
 70         int ret;
 71 
 72         if (sel == rdev->desc->n_voltages - 1)
 73                 val = ARIZONA_LDO1_HI_PWR;
 74         else
 75                 val = 0;
 76 
 77         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
 78                                  ARIZONA_LDO1_HI_PWR, val);
 79         if (ret != 0)
 80                 return ret;
 81 
 82         if (val)
 83                 return 0;
 84 
 85         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
 86 
 87         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
 88                                   ARIZONA_LDO1_VSEL_MASK, val);
 89 }
 90 
 91 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
 92 {
 93         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
 94         struct regmap *regmap = ldo->arizona->regmap;
 95         unsigned int val;
 96         int ret;
 97 
 98         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
 99         if (ret != 0)
100                 return ret;
101 
102         if (val & ARIZONA_LDO1_HI_PWR)
103                 return rdev->desc->n_voltages - 1;
104 
105         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
106         if (ret != 0)
107                 return ret;
108 
109         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
110 }
111 
112 static struct regulator_ops arizona_ldo1_hc_ops = {
113         .list_voltage = arizona_ldo1_hc_list_voltage,
114         .map_voltage = arizona_ldo1_hc_map_voltage,
115         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
116         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
117         .get_bypass = regulator_get_bypass_regmap,
118         .set_bypass = regulator_set_bypass_regmap,
119 };
120 
121 static const struct regulator_desc arizona_ldo1_hc = {
122         .name = "LDO1",
123         .supply_name = "LDOVDD",
124         .type = REGULATOR_VOLTAGE,
125         .ops = &arizona_ldo1_hc_ops,
126 
127         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
128         .bypass_mask = ARIZONA_LDO1_BYPASS,
129         .min_uV = 900000,
130         .uV_step = 50000,
131         .n_voltages = 8,
132         .enable_time = 1500,
133 
134         .owner = THIS_MODULE,
135 };
136 
137 static struct regulator_ops arizona_ldo1_ops = {
138         .list_voltage = regulator_list_voltage_linear,
139         .map_voltage = regulator_map_voltage_linear,
140         .get_voltage_sel = regulator_get_voltage_sel_regmap,
141         .set_voltage_sel = regulator_set_voltage_sel_regmap,
142 };
143 
144 static const struct regulator_desc arizona_ldo1 = {
145         .name = "LDO1",
146         .supply_name = "LDOVDD",
147         .type = REGULATOR_VOLTAGE,
148         .ops = &arizona_ldo1_ops,
149 
150         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
151         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
152         .min_uV = 900000,
153         .uV_step = 25000,
154         .n_voltages = 13,
155         .enable_time = 500,
156 
157         .owner = THIS_MODULE,
158 };
159 
160 static const struct regulator_init_data arizona_ldo1_dvfs = {
161         .constraints = {
162                 .min_uV = 1200000,
163                 .max_uV = 1800000,
164                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
165                                   REGULATOR_CHANGE_VOLTAGE,
166         },
167         .num_consumer_supplies = 1,
168 };
169 
170 static const struct regulator_init_data arizona_ldo1_default = {
171         .constraints = {
172                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
173         },
174         .num_consumer_supplies = 1,
175 };
176 
177 static const struct regulator_init_data arizona_ldo1_wm5110 = {
178         .constraints = {
179                 .min_uV = 1175000,
180                 .max_uV = 1200000,
181                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
182                                   REGULATOR_CHANGE_VOLTAGE,
183         },
184         .num_consumer_supplies = 1,
185 };
186 
187 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
188                                      struct regulator_config *config,
189                                      const struct regulator_desc *desc)
190 {
191         struct arizona_pdata *pdata = &arizona->pdata;
192         struct arizona_ldo1 *ldo1 = config->driver_data;
193         struct device_node *np = arizona->dev->of_node;
194         struct device_node *init_node, *dcvdd_node;
195         struct regulator_init_data *init_data;
196 
197         pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0);
198         if (pdata->ldoena < 0) {
199                 dev_warn(arizona->dev,
200                          "LDOENA GPIO property missing/malformed: %d\n",
201                          pdata->ldoena);
202                 pdata->ldoena = 0;
203         } else {
204                 config->ena_gpio_initialized = true;
205         }
206 
207         init_node = of_get_child_by_name(np, "ldo1");
208         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
209 
210         if (init_node) {
211                 config->of_node = init_node;
212 
213                 init_data = of_get_regulator_init_data(arizona->dev, init_node,
214                                                        desc);
215 
216                 if (init_data) {
217                         init_data->consumer_supplies = &ldo1->supply;
218                         init_data->num_consumer_supplies = 1;
219 
220                         if (dcvdd_node && dcvdd_node != init_node)
221                                 arizona->external_dcvdd = true;
222 
223                         pdata->ldo1 = init_data;
224                 }
225         } else if (dcvdd_node) {
226                 arizona->external_dcvdd = true;
227         }
228 
229         of_node_put(dcvdd_node);
230 
231         return 0;
232 }
233 
234 static int arizona_ldo1_probe(struct platform_device *pdev)
235 {
236         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
237         const struct regulator_desc *desc;
238         struct regulator_config config = { };
239         struct arizona_ldo1 *ldo1;
240         int ret;
241 
242         arizona->external_dcvdd = false;
243 
244         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
245         if (!ldo1)
246                 return -ENOMEM;
247 
248         ldo1->arizona = arizona;
249 
250         /*
251          * Since the chip usually supplies itself we provide some
252          * default init_data for it.  This will be overridden with
253          * platform data if provided.
254          */
255         switch (arizona->type) {
256         case WM5102:
257         case WM8997:
258         case WM8998:
259         case WM1814:
260                 desc = &arizona_ldo1_hc;
261                 ldo1->init_data = arizona_ldo1_dvfs;
262                 break;
263         case WM5110:
264         case WM8280:
265                 desc = &arizona_ldo1;
266                 ldo1->init_data = arizona_ldo1_wm5110;
267                 break;
268         default:
269                 desc = &arizona_ldo1;
270                 ldo1->init_data = arizona_ldo1_default;
271                 break;
272         }
273 
274         ldo1->init_data.consumer_supplies = &ldo1->supply;
275         ldo1->supply.supply = "DCVDD";
276         ldo1->supply.dev_name = dev_name(arizona->dev);
277 
278         config.dev = arizona->dev;
279         config.driver_data = ldo1;
280         config.regmap = arizona->regmap;
281 
282         if (IS_ENABLED(CONFIG_OF)) {
283                 if (!dev_get_platdata(arizona->dev)) {
284                         ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
285                         if (ret < 0)
286                                 return ret;
287                 }
288         }
289 
290         config.ena_gpio = arizona->pdata.ldoena;
291 
292         if (arizona->pdata.ldo1)
293                 config.init_data = arizona->pdata.ldo1;
294         else
295                 config.init_data = &ldo1->init_data;
296 
297         /*
298          * LDO1 can only be used to supply DCVDD so if it has no
299          * consumers then DCVDD is supplied externally.
300          */
301         if (config.init_data->num_consumer_supplies == 0)
302                 arizona->external_dcvdd = true;
303 
304         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
305 
306         of_node_put(config.of_node);
307 
308         if (IS_ERR(ldo1->regulator)) {
309                 ret = PTR_ERR(ldo1->regulator);
310                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
311                         ret);
312                 return ret;
313         }
314 
315         platform_set_drvdata(pdev, ldo1);
316 
317         return 0;
318 }
319 
320 static struct platform_driver arizona_ldo1_driver = {
321         .probe = arizona_ldo1_probe,
322         .driver         = {
323                 .name   = "arizona-ldo1",
324         },
325 };
326 
327 module_platform_driver(arizona_ldo1_driver);
328 
329 /* Module information */
330 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
331 MODULE_DESCRIPTION("Arizona LDO1 driver");
332 MODULE_LICENSE("GPL");
333 MODULE_ALIAS("platform:arizona-ldo1");
334 

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