root/drivers/power/supply/axp20x_ac_power.c

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DEFINITIONS

This source file includes following definitions.
  1. axp20x_ac_power_irq
  2. axp20x_ac_power_get_property
  3. axp813_ac_power_set_property
  4. axp813_ac_power_prop_writeable
  5. axp20x_ac_power_probe

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

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