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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         .ramp_delay = 24000,
134 
135         .owner = THIS_MODULE,
136 };
137 
138 static struct regulator_ops arizona_ldo1_ops = {
139         .list_voltage = regulator_list_voltage_linear,
140         .map_voltage = regulator_map_voltage_linear,
141         .get_voltage_sel = regulator_get_voltage_sel_regmap,
142         .set_voltage_sel = regulator_set_voltage_sel_regmap,
143 };
144 
145 static const struct regulator_desc arizona_ldo1 = {
146         .name = "LDO1",
147         .supply_name = "LDOVDD",
148         .type = REGULATOR_VOLTAGE,
149         .ops = &arizona_ldo1_ops,
150 
151         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
152         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
153         .min_uV = 900000,
154         .uV_step = 25000,
155         .n_voltages = 13,
156         .enable_time = 500,
157         .ramp_delay = 24000,
158 
159         .owner = THIS_MODULE,
160 };
161 
162 static const struct regulator_init_data arizona_ldo1_dvfs = {
163         .constraints = {
164                 .min_uV = 1200000,
165                 .max_uV = 1800000,
166                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
167                                   REGULATOR_CHANGE_VOLTAGE,
168         },
169         .num_consumer_supplies = 1,
170 };
171 
172 static const struct regulator_init_data arizona_ldo1_default = {
173         .constraints = {
174                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
175         },
176         .num_consumer_supplies = 1,
177 };
178 
179 static const struct regulator_init_data arizona_ldo1_wm5110 = {
180         .constraints = {
181                 .min_uV = 1175000,
182                 .max_uV = 1200000,
183                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
184                                   REGULATOR_CHANGE_VOLTAGE,
185         },
186         .num_consumer_supplies = 1,
187 };
188 
189 static int arizona_ldo1_of_get_pdata(struct arizona *arizona,
190                                      struct regulator_config *config,
191                                      const struct regulator_desc *desc)
192 {
193         struct arizona_pdata *pdata = &arizona->pdata;
194         struct arizona_ldo1 *ldo1 = config->driver_data;
195         struct device_node *np = arizona->dev->of_node;
196         struct device_node *init_node, *dcvdd_node;
197         struct regulator_init_data *init_data;
198 
199         pdata->ldoena = of_get_named_gpio(np, "wlf,ldoena", 0);
200         if (pdata->ldoena < 0) {
201                 dev_warn(arizona->dev,
202                          "LDOENA GPIO property missing/malformed: %d\n",
203                          pdata->ldoena);
204                 pdata->ldoena = 0;
205         } else {
206                 config->ena_gpio_initialized = true;
207         }
208 
209         init_node = of_get_child_by_name(np, "ldo1");
210         dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
211 
212         if (init_node) {
213                 config->of_node = init_node;
214 
215                 init_data = of_get_regulator_init_data(arizona->dev, init_node,
216                                                        desc);
217 
218                 if (init_data) {
219                         init_data->consumer_supplies = &ldo1->supply;
220                         init_data->num_consumer_supplies = 1;
221 
222                         if (dcvdd_node && dcvdd_node != init_node)
223                                 arizona->external_dcvdd = true;
224 
225                         pdata->ldo1 = init_data;
226                 }
227         } else if (dcvdd_node) {
228                 arizona->external_dcvdd = true;
229         }
230 
231         of_node_put(dcvdd_node);
232 
233         return 0;
234 }
235 
236 static int arizona_ldo1_probe(struct platform_device *pdev)
237 {
238         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
239         const struct regulator_desc *desc;
240         struct regulator_config config = { };
241         struct arizona_ldo1 *ldo1;
242         int ret;
243 
244         arizona->external_dcvdd = false;
245 
246         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
247         if (!ldo1)
248                 return -ENOMEM;
249 
250         ldo1->arizona = arizona;
251 
252         /*
253          * Since the chip usually supplies itself we provide some
254          * default init_data for it.  This will be overridden with
255          * platform data if provided.
256          */
257         switch (arizona->type) {
258         case WM5102:
259         case WM8997:
260         case WM8998:
261         case WM1814:
262                 desc = &arizona_ldo1_hc;
263                 ldo1->init_data = arizona_ldo1_dvfs;
264                 break;
265         case WM5110:
266         case WM8280:
267                 desc = &arizona_ldo1;
268                 ldo1->init_data = arizona_ldo1_wm5110;
269                 break;
270         default:
271                 desc = &arizona_ldo1;
272                 ldo1->init_data = arizona_ldo1_default;
273                 break;
274         }
275 
276         ldo1->init_data.consumer_supplies = &ldo1->supply;
277         ldo1->supply.supply = "DCVDD";
278         ldo1->supply.dev_name = dev_name(arizona->dev);
279 
280         config.dev = arizona->dev;
281         config.driver_data = ldo1;
282         config.regmap = arizona->regmap;
283 
284         if (IS_ENABLED(CONFIG_OF)) {
285                 if (!dev_get_platdata(arizona->dev)) {
286                         ret = arizona_ldo1_of_get_pdata(arizona, &config, desc);
287                         if (ret < 0)
288                                 return ret;
289                 }
290         }
291 
292         config.ena_gpio = arizona->pdata.ldoena;
293 
294         if (arizona->pdata.ldo1)
295                 config.init_data = arizona->pdata.ldo1;
296         else
297                 config.init_data = &ldo1->init_data;
298 
299         /*
300          * LDO1 can only be used to supply DCVDD so if it has no
301          * consumers then DCVDD is supplied externally.
302          */
303         if (config.init_data->num_consumer_supplies == 0)
304                 arizona->external_dcvdd = true;
305 
306         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
307 
308         of_node_put(config.of_node);
309 
310         if (IS_ERR(ldo1->regulator)) {
311                 ret = PTR_ERR(ldo1->regulator);
312                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
313                         ret);
314                 return ret;
315         }
316 
317         platform_set_drvdata(pdev, ldo1);
318 
319         return 0;
320 }
321 
322 static struct platform_driver arizona_ldo1_driver = {
323         .probe = arizona_ldo1_probe,
324         .driver         = {
325                 .name   = "arizona-ldo1",
326         },
327 };
328 
329 module_platform_driver(arizona_ldo1_driver);
330 
331 /* Module information */
332 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
333 MODULE_DESCRIPTION("Arizona LDO1 driver");
334 MODULE_LICENSE("GPL");
335 MODULE_ALIAS("platform:arizona-ldo1");
336 

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