drivers/power/supply/axp20x_ac_power.c

   1 /*
   2  * AXP20X and AXP22X PMICs' ACIN power supply driver
   3  *
   4  * Copyright (C) 2016 Free Electrons
   5  *      Quentin Schulz <quentin.schulz@free-electrons.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under  the terms of the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the License, or (at your
  10  * option) any later version.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mfd/axp20x.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/regmap.h>
  24 #include <linux/slab.h>
  25 #include <linux/iio/consumer.h>
  26
  27 #define AXP20X_PWR_STATUS_ACIN_PRESENT  BIT(7)
  28 #define AXP20X_PWR_STATUS_ACIN_AVAIL    BIT(6)
  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 };
  48
  49 static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
  50 {
  51         struct axp20x_ac_power *power = devid;
  52
  53         power_supply_changed(power->supply);
  54
  55         return IRQ_HANDLED;
  56 }
  57
  58 static int axp20x_ac_power_get_property(struct power_supply *psy,
  59                                         enum power_supply_property psp,
  60                                         union power_supply_propval *val)
  61 {
  62         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
  63         int ret, reg;
  64
  65         switch (psp) {
  66         case POWER_SUPPLY_PROP_HEALTH:
  67                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  68                 if (ret)
  69                         return ret;
  70
  71                 if (reg & AXP20X_PWR_STATUS_ACIN_PRESENT) {
  72                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
  73                         return 0;
  74                 }
  75
  76                 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
  77                 return 0;
  78
  79         case POWER_SUPPLY_PROP_PRESENT:
  80                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  81                 if (ret)
  82                         return ret;
  83
  84                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_PRESENT);
  85                 return 0;
  86
  87         case POWER_SUPPLY_PROP_ONLINE:
  88                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  89                 if (ret)
  90                         return ret;
  91
  92                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_AVAIL);
  93                 return 0;
  94
  95         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  96                 ret = iio_read_channel_processed(power->acin_v, &val->intval);
  97                 if (ret)
  98                         return ret;
  99
 100                 /* IIO framework gives mV but Power Supply framework gives uV */
 101                 val->intval *= 1000;
 102
 103                 return 0;
 104
 105         case POWER_SUPPLY_PROP_CURRENT_NOW:
 106                 ret = iio_read_channel_processed(power->acin_i, &val->intval);
 107                 if (ret)
 108                         return ret;
 109
 110                 /* IIO framework gives mA but Power Supply framework gives uA */
 111                 val->intval *= 1000;
 112
 113                 return 0;
 114
 115         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 116                 ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
 117                 if (ret)
 118                         return ret;
 119
 120                 val->intval = AXP813_VHOLD_REG_TO_UV(reg);
 121
 122                 return 0;
 123
 124         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 125                 ret = regmap_read(power->regmap, AXP813_ACIN_PATH_CTRL, &reg);
 126                 if (ret)
 127                         return ret;
 128
 129                 val->intval = AXP813_CURR_LIMIT_REG_TO_UA(reg);
 130                 /* AXP813 datasheet defines values 11x as 4000mA */
 131                 if (val->intval > 4000000)
 132                         val->intval = 4000000;
 133
 134                 return 0;
 135
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         return -EINVAL;
 141 }
 142
 143 static int axp813_ac_power_set_property(struct power_supply *psy,
 144                                         enum power_supply_property psp,
 145                                         const union power_supply_propval *val)
 146 {
 147         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
 148
 149         switch (psp) {
 150         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 151                 if (val->intval < 4000000 || val->intval > 4700000)
 152                         return -EINVAL;
 153
 154                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 155                                           AXP813_VHOLD_MASK,
 156                                           AXP813_VHOLD_UV_TO_BIT(val->intval));
 157
 158         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 159                 if (val->intval < 1500000 || val->intval > 4000000)
 160                         return -EINVAL;
 161
 162                 return regmap_update_bits(power->regmap, AXP813_ACIN_PATH_CTRL,
 163                                           AXP813_CURR_LIMIT_MASK,
 164                                           AXP813_CURR_LIMIT_UA_TO_BIT(val->intval));
 165
 166         default:
 167                 return -EINVAL;
 168         }
 169
 170         return -EINVAL;
 171 }
 172
 173 static int axp813_ac_power_prop_writeable(struct power_supply *psy,
 174                                           enum power_supply_property psp)
 175 {
 176         return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 177                psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
 178 }
 179
 180 static enum power_supply_property axp20x_ac_power_properties[] = {
 181         POWER_SUPPLY_PROP_HEALTH,
 182         POWER_SUPPLY_PROP_PRESENT,
 183         POWER_SUPPLY_PROP_ONLINE,
 184         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 185         POWER_SUPPLY_PROP_CURRENT_NOW,
 186 };
 187
 188 static enum power_supply_property axp22x_ac_power_properties[] = {
 189         POWER_SUPPLY_PROP_HEALTH,
 190         POWER_SUPPLY_PROP_PRESENT,
 191         POWER_SUPPLY_PROP_ONLINE,
 192 };
 193
 194 static enum power_supply_property axp813_ac_power_properties[] = {
 195         POWER_SUPPLY_PROP_HEALTH,
 196         POWER_SUPPLY_PROP_PRESENT,
 197         POWER_SUPPLY_PROP_ONLINE,
 198         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 199         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 200 };
 201
 202 static const struct power_supply_desc axp20x_ac_power_desc = {
 203         .name = "axp20x-ac",
 204         .type = POWER_SUPPLY_TYPE_MAINS,
 205         .properties = axp20x_ac_power_properties,
 206         .num_properties = ARRAY_SIZE(axp20x_ac_power_properties),
 207         .get_property = axp20x_ac_power_get_property,
 208 };
 209
 210 static const struct power_supply_desc axp22x_ac_power_desc = {
 211         .name = "axp22x-ac",
 212         .type = POWER_SUPPLY_TYPE_MAINS,
 213         .properties = axp22x_ac_power_properties,
 214         .num_properties = ARRAY_SIZE(axp22x_ac_power_properties),
 215         .get_property = axp20x_ac_power_get_property,
 216 };
 217
 218 static const struct power_supply_desc axp813_ac_power_desc = {
 219         .name = "axp813-ac",
 220         .type = POWER_SUPPLY_TYPE_MAINS,
 221         .properties = axp813_ac_power_properties,
 222         .num_properties = ARRAY_SIZE(axp813_ac_power_properties),
 223         .property_is_writeable = axp813_ac_power_prop_writeable,
 224         .get_property = axp20x_ac_power_get_property,
 225         .set_property = axp813_ac_power_set_property,
 226 };
 227
 228 struct axp_data {
 229         const struct power_supply_desc  *power_desc;
 230         bool                            acin_adc;
 231 };
 232
 233 static const struct axp_data axp20x_data = {
 234         .power_desc = &axp20x_ac_power_desc,
 235         .acin_adc = true,
 236 };
 237
 238 static const struct axp_data axp22x_data = {
 239         .power_desc = &axp22x_ac_power_desc,
 240         .acin_adc = false,
 241 };
 242
 243 static const struct axp_data axp813_data = {
 244         .power_desc = &axp813_ac_power_desc,
 245         .acin_adc = false,
 246 };
 247
 248 static int axp20x_ac_power_probe(struct platform_device *pdev)
 249 {
 250         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 251         struct power_supply_config psy_cfg = {};
 252         struct axp20x_ac_power *power;
 253         const struct axp_data *axp_data;
 254         static const char * const irq_names[] = { "ACIN_PLUGIN", "ACIN_REMOVAL",
 255                 NULL };
 256         int i, irq, ret;
 257
 258         if (!of_device_is_available(pdev->dev.of_node))
 259                 return -ENODEV;
 260
 261         if (!axp20x) {
 262                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 263                 return -EINVAL;
 264         }
 265
 266         power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 267         if (!power)
 268                 return -ENOMEM;
 269
 270         axp_data = of_device_get_match_data(&pdev->dev);
 271
 272         if (axp_data->acin_adc) {
 273                 power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v");
 274                 if (IS_ERR(power->acin_v)) {
 275                         if (PTR_ERR(power->acin_v) == -ENODEV)
 276                                 return -EPROBE_DEFER;
 277                         return PTR_ERR(power->acin_v);
 278                 }
 279
 280                 power->acin_i = devm_iio_channel_get(&pdev->dev, "acin_i");
 281                 if (IS_ERR(power->acin_i)) {
 282                         if (PTR_ERR(power->acin_i) == -ENODEV)
 283                                 return -EPROBE_DEFER;
 284                         return PTR_ERR(power->acin_i);
 285                 }
 286         }
 287
 288         power->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 289
 290         platform_set_drvdata(pdev, power);
 291
 292         psy_cfg.of_node = pdev->dev.of_node;
 293         psy_cfg.drv_data = power;
 294
 295         power->supply = devm_power_supply_register(&pdev->dev,
 296                                                    axp_data->power_desc,
 297                                                    &psy_cfg);
 298         if (IS_ERR(power->supply))
 299                 return PTR_ERR(power->supply);
 300
 301         /* Request irqs after registering, as irqs may trigger immediately */
 302         for (i = 0; irq_names[i]; i++) {
 303                 irq = platform_get_irq_byname(pdev, irq_names[i]);
 304                 if (irq < 0) {
 305                         dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 306                                  irq_names[i], irq);
 307                         continue;
 308                 }
 309                 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 310                 ret = devm_request_any_context_irq(&pdev->dev, irq,
 311                                                    axp20x_ac_power_irq, 0,
 312                                                    DRVNAME, power);
 313                 if (ret < 0)
 314                         dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 315                                  irq_names[i], ret);
 316         }
 317
 318         return 0;
 319 }
 320
 321 static const struct of_device_id axp20x_ac_power_match[] = {
 322         {
 323                 .compatible = "x-powers,axp202-ac-power-supply",
 324                 .data = &axp20x_data,
 325         }, {
 326                 .compatible = "x-powers,axp221-ac-power-supply",
 327                 .data = &axp22x_data,
 328         }, {
 329                 .compatible = "x-powers,axp813-ac-power-supply",
 330                 .data = &axp813_data,
 331         }, { /* sentinel */ }
 332 };
 333 MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);
 334
 335 static struct platform_driver axp20x_ac_power_driver = {
 336         .probe = axp20x_ac_power_probe,
 337         .driver = {
 338                 .name = DRVNAME,
 339                 .of_match_table = axp20x_ac_power_match,
 340         },
 341 };
 342
 343 module_platform_driver(axp20x_ac_power_driver);
 344
 345 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 346 MODULE_DESCRIPTION("AXP20X and AXP22X PMICs' AC power supply driver");
 347 MODULE_LICENSE("GPL");