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/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_VHOLD_MASK               GENMASK(5, 3)
  27 #define AXP813_VHOLD_UV_TO_BIT(x)       ((((x) / 100000) - 40) << 3)
  28 #define AXP813_VHOLD_REG_TO_UV(x)       \
  29         (((((x) & AXP813_VHOLD_MASK) >> 3) + 40) * 100000)
  30
  31 #define AXP813_CURR_LIMIT_MASK          GENMASK(2, 0)
  32 #define AXP813_CURR_LIMIT_UA_TO_BIT(x)  (((x) / 500000) - 3)
  33 #define AXP813_CURR_LIMIT_REG_TO_UA(x)  \
  34         ((((x) & AXP813_CURR_LIMIT_MASK) + 3) * 500000)
  35
  36 #define DRVNAME "axp20x-ac-power-supply"
  37
  38 struct axp20x_ac_power {
  39         struct regmap *regmap;
  40         struct power_supply *supply;
  41         struct iio_channel *acin_v;
  42         struct iio_channel *acin_i;
  43 };
  44
  45 static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
  46 {
  47         struct axp20x_ac_power *power = devid;
  48
  49         power_supply_changed(power->supply);
  50
  51         return IRQ_HANDLED;
  52 }
  53
  54 static int axp20x_ac_power_get_property(struct power_supply *psy,
  55                                         enum power_supply_property psp,
  56                                         union power_supply_propval *val)
  57 {
  58         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
  59         int ret, reg;
  60
  61         switch (psp) {
  62         case POWER_SUPPLY_PROP_HEALTH:
  63                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  64                 if (ret)
  65                         return ret;
  66
  67                 if (reg & AXP20X_PWR_STATUS_ACIN_PRESENT) {
  68                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
  69                         return 0;
  70                 }
  71
  72                 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
  73                 return 0;
  74
  75         case POWER_SUPPLY_PROP_PRESENT:
  76                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  77                 if (ret)
  78                         return ret;
  79
  80                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_PRESENT);
  81                 return 0;
  82
  83         case POWER_SUPPLY_PROP_ONLINE:
  84                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  85                 if (ret)
  86                         return ret;
  87
  88                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_AVAIL);
  89                 return 0;
  90
  91         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  92                 ret = iio_read_channel_processed(power->acin_v, &val->intval);
  93                 if (ret)
  94                         return ret;
  95
  96                 /* IIO framework gives mV but Power Supply framework gives uV */
  97                 val->intval *= 1000;
  98
  99                 return 0;
 100
 101         case POWER_SUPPLY_PROP_CURRENT_NOW:
 102                 ret = iio_read_channel_processed(power->acin_i, &val->intval);
 103                 if (ret)
 104                         return ret;
 105
 106                 /* IIO framework gives mA but Power Supply framework gives uA */
 107                 val->intval *= 1000;
 108
 109                 return 0;
 110
 111         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 112                 ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
 113                 if (ret)
 114                         return ret;
 115
 116                 val->intval = AXP813_VHOLD_REG_TO_UV(reg);
 117
 118                 return 0;
 119
 120         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 121                 ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
 122                 if (ret)
 123                         return ret;
 124
 125                 val->intval = AXP813_CURR_LIMIT_REG_TO_UA(reg);
 126                 /* AXP813 datasheet defines values 11x as 4000mA */
 127                 if (val->intval > 4000000)
 128                         val->intval = 4000000;
 129
 130                 return 0;
 131
 132         default:
 133                 return -EINVAL;
 134         }
 135
 136         return -EINVAL;
 137 }
 138
 139 static int axp813_ac_power_set_property(struct power_supply *psy,
 140                                         enum power_supply_property psp,
 141                                         const union power_supply_propval *val)
 142 {
 143         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
 144
 145         switch (psp) {
 146         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 147                 if (val->intval < 4000000 || val->intval > 4700000)
 148                         return -EINVAL;
 149
 150                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 151                                           AXP813_VHOLD_MASK,
 152                                           AXP813_VHOLD_UV_TO_BIT(val->intval));
 153
 154         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 155                 if (val->intval < 1500000 || val->intval > 4000000)
 156                         return -EINVAL;
 157
 158                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 159                                           AXP813_CURR_LIMIT_MASK,
 160                                           AXP813_CURR_LIMIT_UA_TO_BIT(val->intval));
 161
 162         default:
 163                 return -EINVAL;
 164         }
 165
 166         return -EINVAL;
 167 }
 168
 169 static int axp813_ac_power_prop_writeable(struct power_supply *psy,
 170                                           enum power_supply_property psp)
 171 {
 172         return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 173                psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
 174 }
 175
 176 static enum power_supply_property axp20x_ac_power_properties[] = {
 177         POWER_SUPPLY_PROP_HEALTH,
 178         POWER_SUPPLY_PROP_PRESENT,
 179         POWER_SUPPLY_PROP_ONLINE,
 180         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 181         POWER_SUPPLY_PROP_CURRENT_NOW,
 182 };
 183
 184 static enum power_supply_property axp22x_ac_power_properties[] = {
 185         POWER_SUPPLY_PROP_HEALTH,
 186         POWER_SUPPLY_PROP_PRESENT,
 187         POWER_SUPPLY_PROP_ONLINE,
 188 };
 189
 190 static enum power_supply_property axp813_ac_power_properties[] = {
 191         POWER_SUPPLY_PROP_HEALTH,
 192         POWER_SUPPLY_PROP_PRESENT,
 193         POWER_SUPPLY_PROP_ONLINE,
 194         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 195         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 196 };
 197
 198 static const struct power_supply_desc axp20x_ac_power_desc = {
 199         .name = "axp20x-ac",
 200         .type = POWER_SUPPLY_TYPE_MAINS,
 201         .properties = axp20x_ac_power_properties,
 202         .num_properties = ARRAY_SIZE(axp20x_ac_power_properties),
 203         .get_property = axp20x_ac_power_get_property,
 204 };
 205
 206 static const struct power_supply_desc axp22x_ac_power_desc = {
 207         .name = "axp22x-ac",
 208         .type = POWER_SUPPLY_TYPE_MAINS,
 209         .properties = axp22x_ac_power_properties,
 210         .num_properties = ARRAY_SIZE(axp22x_ac_power_properties),
 211         .get_property = axp20x_ac_power_get_property,
 212 };
 213
 214 static const struct power_supply_desc axp813_ac_power_desc = {
 215         .name = "axp813-ac",
 216         .type = POWER_SUPPLY_TYPE_MAINS,
 217         .properties = axp813_ac_power_properties,
 218         .num_properties = ARRAY_SIZE(axp813_ac_power_properties),
 219         .property_is_writeable = axp813_ac_power_prop_writeable,
 220         .get_property = axp20x_ac_power_get_property,
 221         .set_property = axp813_ac_power_set_property,
 222 };
 223
 224 struct axp_data {
 225         const struct power_supply_desc  *power_desc;
 226         bool                            acin_adc;
 227 };
 228
 229 static const struct axp_data axp20x_data = {
 230         .power_desc = &axp20x_ac_power_desc,
 231         .acin_adc = true,
 232 };
 233
 234 static const struct axp_data axp22x_data = {
 235         .power_desc = &axp22x_ac_power_desc,
 236         .acin_adc = false,
 237 };
 238
 239 static const struct axp_data axp813_data = {
 240         .power_desc = &axp813_ac_power_desc,
 241         .acin_adc = false,
 242 };
 243
 244 static int axp20x_ac_power_probe(struct platform_device *pdev)
 245 {
 246         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 247         struct power_supply_config psy_cfg = {};
 248         struct axp20x_ac_power *power;
 249         const struct axp_data *axp_data;
 250         static const char * const irq_names[] = { "ACIN_PLUGIN", "ACIN_REMOVAL",
 251                 NULL };
 252         int i, irq, ret;
 253
 254         if (!of_device_is_available(pdev->dev.of_node))
 255                 return -ENODEV;
 256
 257         if (!axp20x) {
 258                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 259                 return -EINVAL;
 260         }
 261
 262         power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 263         if (!power)
 264                 return -ENOMEM;
 265
 266         axp_data = of_device_get_match_data(&pdev->dev);
 267
 268         if (axp_data->acin_adc) {
 269                 power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v");
 270                 if (IS_ERR(power->acin_v)) {
 271                         if (PTR_ERR(power->acin_v) == -ENODEV)
 272                                 return -EPROBE_DEFER;
 273                         return PTR_ERR(power->acin_v);
 274                 }
 275
 276                 power->acin_i = devm_iio_channel_get(&pdev->dev, "acin_i");
 277                 if (IS_ERR(power->acin_i)) {
 278                         if (PTR_ERR(power->acin_i) == -ENODEV)
 279                                 return -EPROBE_DEFER;
 280                         return PTR_ERR(power->acin_i);
 281                 }
 282         }
 283
 284         power->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 285
 286         platform_set_drvdata(pdev, power);
 287
 288         psy_cfg.of_node = pdev->dev.of_node;
 289         psy_cfg.drv_data = power;
 290
 291         power->supply = devm_power_supply_register(&pdev->dev,
 292                                                    axp_data->power_desc,
 293                                                    &psy_cfg);
 294         if (IS_ERR(power->supply))
 295                 return PTR_ERR(power->supply);
 296
 297         /* Request irqs after registering, as irqs may trigger immediately */
 298         for (i = 0; irq_names[i]; i++) {
 299                 irq = platform_get_irq_byname(pdev, irq_names[i]);
 300                 if (irq < 0) {
 301                         dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 302                                  irq_names[i], irq);
 303                         continue;
 304                 }
 305                 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 306                 ret = devm_request_any_context_irq(&pdev->dev, irq,
 307                                                    axp20x_ac_power_irq, 0,
 308                                                    DRVNAME, power);
 309                 if (ret < 0)
 310                         dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 311                                  irq_names[i], ret);
 312         }
 313
 314         return 0;
 315 }
 316
 317 static const struct of_device_id axp20x_ac_power_match[] = {
 318         {
 319                 .compatible = "x-powers,axp202-ac-power-supply",
 320                 .data = &axp20x_data,
 321         }, {
 322                 .compatible = "x-powers,axp221-ac-power-supply",
 323                 .data = &axp22x_data,
 324         }, {
 325                 .compatible = "x-powers,axp813-ac-power-supply",
 326                 .data = &axp813_data,
 327         }, { /* sentinel */ }
 328 };
 329 MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);
 330
 331 static struct platform_driver axp20x_ac_power_driver = {
 332         .probe = axp20x_ac_power_probe,
 333         .driver = {
 334                 .name = DRVNAME,
 335                 .of_match_table = axp20x_ac_power_match,
 336         },
 337 };
 338
 339 module_platform_driver(axp20x_ac_power_driver);
 340
 341 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 342 MODULE_DESCRIPTION("AXP20X and AXP22X PMICs' AC power supply driver");
 343 MODULE_LICENSE("GPL");