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