drivers/power/supply/axp20x_ac_power.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * AXP20X and AXP22X PMICs' ACIN power supply driver
   4  *
   5  * Copyright (C) 2016 Free Electrons
   6  *      Quentin Schulz <quentin.schulz@free-electrons.com>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mfd/axp20x.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/pm.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/regmap.h>
  21 #include <linux/slab.h>
  22 #include <linux/iio/consumer.h>
  23
  24 #define AXP20X_PWR_STATUS_ACIN_PRESENT  BIT(7)
  25 #define AXP20X_PWR_STATUS_ACIN_AVAIL    BIT(6)
  26
  27 #define AXP813_ACIN_PATH_SEL            BIT(7)
  28 #define AXP813_ACIN_PATH_SEL_TO_BIT(x)  (!!(x) << 7)
  29
  30 #define AXP813_VHOLD_MASK               GENMASK(5, 3)
  31 #define AXP813_VHOLD_UV_TO_BIT(x)       ((((x) / 100000) - 40) << 3)
  32 #define AXP813_VHOLD_REG_TO_UV(x)       \
  33         (((((x) & AXP813_VHOLD_MASK) >> 3) + 40) * 100000)
  34
  35 #define AXP813_CURR_LIMIT_MASK          GENMASK(2, 0)
  36 #define AXP813_CURR_LIMIT_UA_TO_BIT(x)  (((x) / 500000) - 3)
  37 #define AXP813_CURR_LIMIT_REG_TO_UA(x)  \
  38         ((((x) & AXP813_CURR_LIMIT_MASK) + 3) * 500000)
  39
  40 #define DRVNAME "axp20x-ac-power-supply"
  41
  42 struct axp20x_ac_power {
  43         struct regmap *regmap;
  44         struct power_supply *supply;
  45         struct iio_channel *acin_v;
  46         struct iio_channel *acin_i;
  47         bool has_acin_path_sel;
  48         unsigned int num_irqs;
  49         unsigned int irqs[];
  50 };
  51
  52 static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
  53 {
  54         struct axp20x_ac_power *power = devid;
  55
  56         power_supply_changed(power->supply);
  57
  58         return IRQ_HANDLED;
  59 }
  60
  61 static int axp20x_ac_power_get_property(struct power_supply *psy,
  62                                         enum power_supply_property psp,
  63                                         union power_supply_propval *val)
  64 {
  65         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
  66         int ret, reg;
  67
  68         switch (psp) {
  69         case POWER_SUPPLY_PROP_HEALTH:
  70                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  71                 if (ret)
  72                         return ret;
  73
  74                 if (reg & AXP20X_PWR_STATUS_ACIN_PRESENT) {
  75                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
  76                         return 0;
  77                 }
  78
  79                 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
  80                 return 0;
  81
  82         case POWER_SUPPLY_PROP_PRESENT:
  83                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  84                 if (ret)
  85                         return ret;
  86
  87                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_PRESENT);
  88                 return 0;
  89
  90         case POWER_SUPPLY_PROP_ONLINE:
  91                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  92                 if (ret)
  93                         return ret;
  94
  95                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_AVAIL);
  96
  97                 /* ACIN_PATH_SEL disables ACIN even if ACIN_AVAIL is set. */
  98                 if (val->intval && power->has_acin_path_sel) {
  99                         ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL,
 100                                           &reg);
 101                         if (ret)
 102                                 return ret;
 103
 104                         val->intval = !!(reg & AXP813_ACIN_PATH_SEL);
 105                 }
 106
 107                 return 0;
 108
 109         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 110                 ret = iio_read_channel_processed(power->acin_v, &val->intval);
 111                 if (ret)
 112                         return ret;
 113
 114                 /* IIO framework gives mV but Power Supply framework gives uV */
 115                 val->intval *= 1000;
 116
 117                 return 0;
 118
 119         case POWER_SUPPLY_PROP_CURRENT_NOW:
 120                 ret = iio_read_channel_processed(power->acin_i, &val->intval);
 121                 if (ret)
 122                         return ret;
 123
 124                 /* IIO framework gives mA but Power Supply framework gives uA */
 125                 val->intval *= 1000;
 126
 127                 return 0;
 128
 129         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 130                 ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
 131                 if (ret)
 132                         return ret;
 133
 134                 val->intval = AXP813_VHOLD_REG_TO_UV(reg);
 135
 136                 return 0;
 137
 138         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 139                 ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
 140                 if (ret)
 141                         return ret;
 142
 143                 val->intval = AXP813_CURR_LIMIT_REG_TO_UA(reg);
 144                 /* AXP813 datasheet defines values 11x as 4000mA */
 145                 if (val->intval > 4000000)
 146                         val->intval = 4000000;
 147
 148                 return 0;
 149
 150         default:
 151                 return -EINVAL;
 152         }
 153
 154         return -EINVAL;
 155 }
 156
 157 static int axp813_ac_power_set_property(struct power_supply *psy,
 158                                         enum power_supply_property psp,
 159                                         const union power_supply_propval *val)
 160 {
 161         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
 162
 163         switch (psp) {
 164         case POWER_SUPPLY_PROP_ONLINE:
 165                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 166                                           AXP813_ACIN_PATH_SEL,
 167                                           AXP813_ACIN_PATH_SEL_TO_BIT(val->intval));
 168
 169         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 170                 if (val->intval < 4000000 || val->intval > 4700000)
 171                         return -EINVAL;
 172
 173                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 174                                           AXP813_VHOLD_MASK,
 175                                           AXP813_VHOLD_UV_TO_BIT(val->intval));
 176
 177         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 178                 if (val->intval < 1500000 || val->intval > 4000000)
 179                         return -EINVAL;
 180
 181                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 182                                           AXP813_CURR_LIMIT_MASK,
 183                                           AXP813_CURR_LIMIT_UA_TO_BIT(val->intval));
 184
 185         default:
 186                 return -EINVAL;
 187         }
 188
 189         return -EINVAL;
 190 }
 191
 192 static int axp813_ac_power_prop_writeable(struct power_supply *psy,
 193                                           enum power_supply_property psp)
 194 {
 195         return psp == POWER_SUPPLY_PROP_ONLINE ||
 196                psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 197                psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
 198 }
 199
 200 static enum power_supply_property axp20x_ac_power_properties[] = {
 201         POWER_SUPPLY_PROP_HEALTH,
 202         POWER_SUPPLY_PROP_PRESENT,
 203         POWER_SUPPLY_PROP_ONLINE,
 204         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 205         POWER_SUPPLY_PROP_CURRENT_NOW,
 206 };
 207
 208 static enum power_supply_property axp22x_ac_power_properties[] = {
 209         POWER_SUPPLY_PROP_HEALTH,
 210         POWER_SUPPLY_PROP_PRESENT,
 211         POWER_SUPPLY_PROP_ONLINE,
 212 };
 213
 214 static enum power_supply_property axp813_ac_power_properties[] = {
 215         POWER_SUPPLY_PROP_HEALTH,
 216         POWER_SUPPLY_PROP_PRESENT,
 217         POWER_SUPPLY_PROP_ONLINE,
 218         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 219         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 220 };
 221
 222 static const struct power_supply_desc axp20x_ac_power_desc = {
 223         .name = "axp20x-ac",
 224         .type = POWER_SUPPLY_TYPE_MAINS,
 225         .properties = axp20x_ac_power_properties,
 226         .num_properties = ARRAY_SIZE(axp20x_ac_power_properties),
 227         .get_property = axp20x_ac_power_get_property,
 228 };
 229
 230 static const struct power_supply_desc axp22x_ac_power_desc = {
 231         .name = "axp22x-ac",
 232         .type = POWER_SUPPLY_TYPE_MAINS,
 233         .properties = axp22x_ac_power_properties,
 234         .num_properties = ARRAY_SIZE(axp22x_ac_power_properties),
 235         .get_property = axp20x_ac_power_get_property,
 236 };
 237
 238 static const struct power_supply_desc axp813_ac_power_desc = {
 239         .name = "axp813-ac",
 240         .type = POWER_SUPPLY_TYPE_MAINS,
 241         .properties = axp813_ac_power_properties,
 242         .num_properties = ARRAY_SIZE(axp813_ac_power_properties),
 243         .property_is_writeable = axp813_ac_power_prop_writeable,
 244         .get_property = axp20x_ac_power_get_property,
 245         .set_property = axp813_ac_power_set_property,
 246 };
 247
 248 static const char * const axp20x_irq_names[] = {
 249         "ACIN_PLUGIN",
 250         "ACIN_REMOVAL",
 251 };
 252
 253 struct axp_data {
 254         const struct power_supply_desc  *power_desc;
 255         const char * const              *irq_names;
 256         unsigned int                    num_irq_names;
 257         bool                            acin_adc;
 258         bool                            acin_path_sel;
 259 };
 260
 261 static const struct axp_data axp20x_data = {
 262         .power_desc     = &axp20x_ac_power_desc,
 263         .irq_names      = axp20x_irq_names,
 264         .num_irq_names  = ARRAY_SIZE(axp20x_irq_names),
 265         .acin_adc       = true,
 266         .acin_path_sel  = false,
 267 };
 268
 269 static const struct axp_data axp22x_data = {
 270         .power_desc     = &axp22x_ac_power_desc,
 271         .irq_names      = axp20x_irq_names,
 272         .num_irq_names  = ARRAY_SIZE(axp20x_irq_names),
 273         .acin_adc       = false,
 274         .acin_path_sel  = false,
 275 };
 276
 277 static const struct axp_data axp813_data = {
 278         .power_desc     = &axp813_ac_power_desc,
 279         .irq_names      = axp20x_irq_names,
 280         .num_irq_names  = ARRAY_SIZE(axp20x_irq_names),
 281         .acin_adc       = false,
 282         .acin_path_sel  = true,
 283 };
 284
 285 #ifdef CONFIG_PM_SLEEP
 286 static int axp20x_ac_power_suspend(struct device *dev)
 287 {
 288         struct axp20x_ac_power *power = dev_get_drvdata(dev);
 289         int i = 0;
 290
 291         /*
 292          * Allow wake via ACIN_PLUGIN only.
 293          *
 294          * As nested threaded IRQs are not automatically disabled during
 295          * suspend, we must explicitly disable the remainder of the IRQs.
 296          */
 297         if (device_may_wakeup(&power->supply->dev))
 298                 enable_irq_wake(power->irqs[i++]);
 299         while (i < power->num_irqs)
 300                 disable_irq(power->irqs[i++]);
 301
 302         return 0;
 303 }
 304
 305 static int axp20x_ac_power_resume(struct device *dev)
 306 {
 307         struct axp20x_ac_power *power = dev_get_drvdata(dev);
 308         int i = 0;
 309
 310         if (device_may_wakeup(&power->supply->dev))
 311                 disable_irq_wake(power->irqs[i++]);
 312         while (i < power->num_irqs)
 313                 enable_irq(power->irqs[i++]);
 314
 315         return 0;
 316 }
 317 #endif
 318
 319 static SIMPLE_DEV_PM_OPS(axp20x_ac_power_pm_ops, axp20x_ac_power_suspend,
 320                                                  axp20x_ac_power_resume);
 321
 322 static int axp20x_ac_power_probe(struct platform_device *pdev)
 323 {
 324         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 325         struct power_supply_config psy_cfg = {};
 326         struct axp20x_ac_power *power;
 327         const struct axp_data *axp_data;
 328         int i, irq, ret;
 329
 330         if (!of_device_is_available(pdev->dev.of_node))
 331                 return -ENODEV;
 332
 333         if (!axp20x) {
 334                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 335                 return -EINVAL;
 336         }
 337
 338         axp_data = of_device_get_match_data(&pdev->dev);
 339
 340         power = devm_kzalloc(&pdev->dev,
 341                              struct_size(power, irqs, axp_data->num_irq_names),
 342                              GFP_KERNEL);
 343         if (!power)
 344                 return -ENOMEM;
 345
 346         if (axp_data->acin_adc) {
 347                 power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v");
 348                 if (IS_ERR(power->acin_v)) {
 349                         if (PTR_ERR(power->acin_v) == -ENODEV)
 350                                 return -EPROBE_DEFER;
 351                         return PTR_ERR(power->acin_v);
 352                 }
 353
 354                 power->acin_i = devm_iio_channel_get(&pdev->dev, "acin_i");
 355                 if (IS_ERR(power->acin_i)) {
 356                         if (PTR_ERR(power->acin_i) == -ENODEV)
 357                                 return -EPROBE_DEFER;
 358                         return PTR_ERR(power->acin_i);
 359                 }
 360         }
 361
 362         power->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 363         power->has_acin_path_sel = axp_data->acin_path_sel;
 364         power->num_irqs = axp_data->num_irq_names;
 365
 366         platform_set_drvdata(pdev, power);
 367
 368         psy_cfg.of_node = pdev->dev.of_node;
 369         psy_cfg.drv_data = power;
 370
 371         power->supply = devm_power_supply_register(&pdev->dev,
 372                                                    axp_data->power_desc,
 373                                                    &psy_cfg);
 374         if (IS_ERR(power->supply))
 375                 return PTR_ERR(power->supply);
 376
 377         /* Request irqs after registering, as irqs may trigger immediately */
 378         for (i = 0; i < axp_data->num_irq_names; i++) {
 379                 irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
 380                 if (irq < 0) {
 381                         dev_err(&pdev->dev, "No IRQ for %s: %d\n",
 382                                 axp_data->irq_names[i], irq);
 383                         return irq;
 384                 }
 385                 power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 386                 ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i],
 387                                                    axp20x_ac_power_irq, 0,
 388                                                    DRVNAME, power);
 389                 if (ret < 0) {
 390                         dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n",
 391                                 axp_data->irq_names[i], ret);
 392                         return ret;
 393                 }
 394         }
 395
 396         return 0;
 397 }
 398
 399 static const struct of_device_id axp20x_ac_power_match[] = {
 400         {
 401                 .compatible = "x-powers,axp202-ac-power-supply",
 402                 .data = &axp20x_data,
 403         }, {
 404                 .compatible = "x-powers,axp221-ac-power-supply",
 405                 .data = &axp22x_data,
 406         }, {
 407                 .compatible = "x-powers,axp813-ac-power-supply",
 408                 .data = &axp813_data,
 409         }, { /* sentinel */ }
 410 };
 411 MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);
 412
 413 static struct platform_driver axp20x_ac_power_driver = {
 414         .probe = axp20x_ac_power_probe,
 415         .driver = {
 416                 .name           = DRVNAME,
 417                 .of_match_table = axp20x_ac_power_match,
 418                 .pm             = &axp20x_ac_power_pm_ops,
 419         },
 420 };
 421
 422 module_platform_driver(axp20x_ac_power_driver);
 423
 424 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 425 MODULE_DESCRIPTION("AXP20X and AXP22X PMICs' AC power supply driver");
 426 MODULE_LICENSE("GPL");