drivers/regulator/arizona-micsupp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // arizona-micsupp.c  --  Microphone supply for Arizona devices
   4 //
   5 // Copyright 2012 Wolfson Microelectronics PLC.
   6 //
   7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/init.h>
  12 #include <linux/bitops.h>
  13 #include <linux/err.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/regulator/of_regulator.h>
  19 #include <linux/gpio.h>
  20 #include <linux/slab.h>
  21 #include <linux/workqueue.h>
  22 #include <sound/soc.h>
  23
  24 #include <linux/mfd/arizona/core.h>
  25 #include <linux/mfd/arizona/pdata.h>
  26 #include <linux/mfd/arizona/registers.h>
  27
  28 #include <linux/regulator/arizona-micsupp.h>
  29
  30 struct arizona_micsupp {
  31         struct regulator_dev *regulator;
  32         struct regmap *regmap;
  33         struct snd_soc_dapm_context **dapm;
  34         unsigned int enable_reg;
  35         struct device *dev;
  36
  37         struct regulator_consumer_supply supply;
  38         struct regulator_init_data init_data;
  39
  40         struct work_struct check_cp_work;
  41 };
  42
  43 static void arizona_micsupp_check_cp(struct work_struct *work)
  44 {
  45         struct arizona_micsupp *micsupp =
  46                 container_of(work, struct arizona_micsupp, check_cp_work);
  47         struct snd_soc_dapm_context *dapm = *micsupp->dapm;
  48         struct snd_soc_component *component;
  49         unsigned int val;
  50         int ret;
  51
  52         ret = regmap_read(micsupp->regmap, micsupp->enable_reg, &val);
  53         if (ret != 0) {
  54                 dev_err(micsupp->dev,
  55                         "Failed to read CP state: %d\n", ret);
  56                 return;
  57         }
  58
  59         if (dapm) {
  60                 component = snd_soc_dapm_to_component(dapm);
  61
  62                 if ((val & (ARIZONA_CPMIC_ENA | ARIZONA_CPMIC_BYPASS)) ==
  63                     ARIZONA_CPMIC_ENA)
  64                         snd_soc_component_force_enable_pin(component,
  65                                                            "MICSUPP");
  66                 else
  67                         snd_soc_component_disable_pin(component, "MICSUPP");
  68
  69                 snd_soc_dapm_sync(dapm);
  70         }
  71 }
  72
  73 static int arizona_micsupp_enable(struct regulator_dev *rdev)
  74 {
  75         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
  76         int ret;
  77
  78         ret = regulator_enable_regmap(rdev);
  79
  80         if (ret == 0)
  81                 schedule_work(&micsupp->check_cp_work);
  82
  83         return ret;
  84 }
  85
  86 static int arizona_micsupp_disable(struct regulator_dev *rdev)
  87 {
  88         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
  89         int ret;
  90
  91         ret = regulator_disable_regmap(rdev);
  92         if (ret == 0)
  93                 schedule_work(&micsupp->check_cp_work);
  94
  95         return ret;
  96 }
  97
  98 static int arizona_micsupp_set_bypass(struct regulator_dev *rdev, bool ena)
  99 {
 100         struct arizona_micsupp *micsupp = rdev_get_drvdata(rdev);
 101         int ret;
 102
 103         ret = regulator_set_bypass_regmap(rdev, ena);
 104         if (ret == 0)
 105                 schedule_work(&micsupp->check_cp_work);
 106
 107         return ret;
 108 }
 109
 110 static const struct regulator_ops arizona_micsupp_ops = {
 111         .enable = arizona_micsupp_enable,
 112         .disable = arizona_micsupp_disable,
 113         .is_enabled = regulator_is_enabled_regmap,
 114
 115         .list_voltage = regulator_list_voltage_linear_range,
 116         .map_voltage = regulator_map_voltage_linear_range,
 117
 118         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 119         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 120
 121         .get_bypass = regulator_get_bypass_regmap,
 122         .set_bypass = arizona_micsupp_set_bypass,
 123 };
 124
 125 static const struct regulator_linear_range arizona_micsupp_ranges[] = {
 126         REGULATOR_LINEAR_RANGE(1700000, 0,    0x1e, 50000),
 127         REGULATOR_LINEAR_RANGE(3300000, 0x1f, 0x1f, 0),
 128 };
 129
 130 static const struct regulator_desc arizona_micsupp = {
 131         .name = "MICVDD",
 132         .supply_name = "CPVDD",
 133         .type = REGULATOR_VOLTAGE,
 134         .n_voltages = 32,
 135         .ops = &arizona_micsupp_ops,
 136
 137         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
 138         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
 139         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 140         .enable_mask = ARIZONA_CPMIC_ENA,
 141         .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 142         .bypass_mask = ARIZONA_CPMIC_BYPASS,
 143
 144         .linear_ranges = arizona_micsupp_ranges,
 145         .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ranges),
 146
 147         .enable_time = 3000,
 148
 149         .owner = THIS_MODULE,
 150 };
 151
 152 static const struct regulator_linear_range arizona_micsupp_ext_ranges[] = {
 153         REGULATOR_LINEAR_RANGE(900000,  0,    0x14, 25000),
 154         REGULATOR_LINEAR_RANGE(1500000, 0x15, 0x27, 100000),
 155 };
 156
 157 static const struct regulator_desc arizona_micsupp_ext = {
 158         .name = "MICVDD",
 159         .supply_name = "CPVDD",
 160         .type = REGULATOR_VOLTAGE,
 161         .n_voltages = 40,
 162         .ops = &arizona_micsupp_ops,
 163
 164         .vsel_reg = ARIZONA_LDO2_CONTROL_1,
 165         .vsel_mask = ARIZONA_LDO2_VSEL_MASK,
 166         .enable_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 167         .enable_mask = ARIZONA_CPMIC_ENA,
 168         .bypass_reg = ARIZONA_MIC_CHARGE_PUMP_1,
 169         .bypass_mask = ARIZONA_CPMIC_BYPASS,
 170
 171         .linear_ranges = arizona_micsupp_ext_ranges,
 172         .n_linear_ranges = ARRAY_SIZE(arizona_micsupp_ext_ranges),
 173
 174         .enable_time = 3000,
 175
 176         .owner = THIS_MODULE,
 177 };
 178
 179 static const struct regulator_init_data arizona_micsupp_default = {
 180         .constraints = {
 181                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 182                                 REGULATOR_CHANGE_VOLTAGE |
 183                                 REGULATOR_CHANGE_BYPASS,
 184                 .min_uV = 1700000,
 185                 .max_uV = 3300000,
 186         },
 187
 188         .num_consumer_supplies = 1,
 189 };
 190
 191 static const struct regulator_init_data arizona_micsupp_ext_default = {
 192         .constraints = {
 193                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
 194                                 REGULATOR_CHANGE_VOLTAGE |
 195                                 REGULATOR_CHANGE_BYPASS,
 196                 .min_uV = 900000,
 197                 .max_uV = 3300000,
 198         },
 199
 200         .num_consumer_supplies = 1,
 201 };
 202
 203 static int arizona_micsupp_of_get_pdata(struct arizona_micsupp_pdata *pdata,
 204                                         struct regulator_config *config,
 205                                         const struct regulator_desc *desc)
 206 {
 207         struct arizona_micsupp *micsupp = config->driver_data;
 208         struct device_node *np;
 209         struct regulator_init_data *init_data;
 210
 211         np = of_get_child_by_name(config->dev->of_node, "micvdd");
 212
 213         if (np) {
 214                 config->of_node = np;
 215
 216                 init_data = of_get_regulator_init_data(config->dev, np, desc);
 217
 218                 if (init_data) {
 219                         init_data->consumer_supplies = &micsupp->supply;
 220                         init_data->num_consumer_supplies = 1;
 221
 222                         pdata->init_data = init_data;
 223                 }
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int arizona_micsupp_common_init(struct platform_device *pdev,
 230                                        struct arizona_micsupp *micsupp,
 231                                        const struct regulator_desc *desc,
 232                                        struct arizona_micsupp_pdata *pdata)
 233 {
 234         struct regulator_config config = { };
 235         int ret;
 236
 237         INIT_WORK(&micsupp->check_cp_work, arizona_micsupp_check_cp);
 238
 239         micsupp->init_data.consumer_supplies = &micsupp->supply;
 240         micsupp->supply.supply = "MICVDD";
 241         micsupp->supply.dev_name = dev_name(micsupp->dev);
 242         micsupp->enable_reg = desc->enable_reg;
 243
 244         config.dev = micsupp->dev;
 245         config.driver_data = micsupp;
 246         config.regmap = micsupp->regmap;
 247
 248         if (IS_ENABLED(CONFIG_OF)) {
 249                 if (!dev_get_platdata(micsupp->dev)) {
 250                         ret = arizona_micsupp_of_get_pdata(pdata, &config,
 251                                                            desc);
 252                         if (ret < 0)
 253                                 return ret;
 254                 }
 255         }
 256
 257         if (pdata->init_data)
 258                 config.init_data = pdata->init_data;
 259         else
 260                 config.init_data = &micsupp->init_data;
 261
 262         /* Default to regulated mode */
 263         regmap_update_bits(micsupp->regmap, micsupp->enable_reg,
 264                            ARIZONA_CPMIC_BYPASS, 0);
 265
 266         micsupp->regulator = devm_regulator_register(&pdev->dev,
 267                                                      desc,
 268                                                      &config);
 269
 270         of_node_put(config.of_node);
 271
 272         if (IS_ERR(micsupp->regulator)) {
 273                 ret = PTR_ERR(micsupp->regulator);
 274                 dev_err(micsupp->dev, "Failed to register mic supply: %d\n",
 275                         ret);
 276                 return ret;
 277         }
 278
 279         platform_set_drvdata(pdev, micsupp);
 280
 281         return 0;
 282 }
 283
 284 static int arizona_micsupp_probe(struct platform_device *pdev)
 285 {
 286         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
 287         const struct regulator_desc *desc;
 288         struct arizona_micsupp *micsupp;
 289
 290         micsupp = devm_kzalloc(&pdev->dev, sizeof(*micsupp), GFP_KERNEL);
 291         if (!micsupp)
 292                 return -ENOMEM;
 293
 294         micsupp->regmap = arizona->regmap;
 295         micsupp->dapm = &arizona->dapm;
 296         micsupp->dev = arizona->dev;
 297
 298         /*
 299          * Since the chip usually supplies itself we provide some
 300          * default init_data for it.  This will be overridden with
 301          * platform data if provided.
 302          */
 303         switch (arizona->type) {
 304         case WM5110:
 305         case WM8280:
 306                 desc = &arizona_micsupp_ext;
 307                 micsupp->init_data = arizona_micsupp_ext_default;
 308                 break;
 309         default:
 310                 desc = &arizona_micsupp;
 311                 micsupp->init_data = arizona_micsupp_default;
 312                 break;
 313         }
 314
 315         return arizona_micsupp_common_init(pdev, micsupp, desc,
 316                                            &arizona->pdata.micvdd);
 317 }
 318
 319 static struct platform_driver arizona_micsupp_driver = {
 320         .probe = arizona_micsupp_probe,
 321         .driver         = {
 322                 .name   = "arizona-micsupp",
 323         },
 324 };
 325
 326 module_platform_driver(arizona_micsupp_driver);
 327
 328 /* Module information */
 329 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 330 MODULE_DESCRIPTION("Arizona microphone supply driver");
 331 MODULE_LICENSE("GPL");
 332 MODULE_ALIAS("platform:arizona-micsupp");