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 DRVNAME "axp20x-ac-power-supply"
  31
  32 struct axp20x_ac_power {
  33         struct regmap *regmap;
  34         struct power_supply *supply;
  35         struct iio_channel *acin_v;
  36         struct iio_channel *acin_i;
  37 };
  38
  39 static irqreturn_t axp20x_ac_power_irq(int irq, void *devid)
  40 {
  41         struct axp20x_ac_power *power = devid;
  42
  43         power_supply_changed(power->supply);
  44
  45         return IRQ_HANDLED;
  46 }
  47
  48 static int axp20x_ac_power_get_property(struct power_supply *psy,
  49                                         enum power_supply_property psp,
  50                                         union power_supply_propval *val)
  51 {
  52         struct axp20x_ac_power *power = power_supply_get_drvdata(psy);
  53         int ret, reg;
  54
  55         switch (psp) {
  56         case POWER_SUPPLY_PROP_HEALTH:
  57                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  58                 if (ret)
  59                         return ret;
  60
  61                 if (reg & AXP20X_PWR_STATUS_ACIN_PRESENT) {
  62                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
  63                         return 0;
  64                 }
  65
  66                 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
  67                 return 0;
  68
  69         case POWER_SUPPLY_PROP_PRESENT:
  70                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  71                 if (ret)
  72                         return ret;
  73
  74                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_PRESENT);
  75                 return 0;
  76
  77         case POWER_SUPPLY_PROP_ONLINE:
  78                 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &reg);
  79                 if (ret)
  80                         return ret;
  81
  82                 val->intval = !!(reg & AXP20X_PWR_STATUS_ACIN_AVAIL);
  83                 return 0;
  84
  85         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  86                 ret = iio_read_channel_processed(power->acin_v, &val->intval);
  87                 if (ret)
  88                         return ret;
  89
  90                 /* IIO framework gives mV but Power Supply framework gives uV */
  91                 val->intval *= 1000;
  92
  93                 return 0;
  94
  95         case POWER_SUPPLY_PROP_CURRENT_NOW:
  96                 ret = iio_read_channel_processed(power->acin_i, &val->intval);
  97                 if (ret)
  98                         return ret;
  99
 100                 /* IIO framework gives mA but Power Supply framework gives uA */
 101                 val->intval *= 1000;
 102
 103                 return 0;
 104
 105         default:
 106                 return -EINVAL;
 107         }
 108
 109         return -EINVAL;
 110 }
 111
 112 static enum power_supply_property axp20x_ac_power_properties[] = {
 113         POWER_SUPPLY_PROP_HEALTH,
 114         POWER_SUPPLY_PROP_PRESENT,
 115         POWER_SUPPLY_PROP_ONLINE,
 116         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 117         POWER_SUPPLY_PROP_CURRENT_NOW,
 118 };
 119
 120 static enum power_supply_property axp22x_ac_power_properties[] = {
 121         POWER_SUPPLY_PROP_HEALTH,
 122         POWER_SUPPLY_PROP_PRESENT,
 123         POWER_SUPPLY_PROP_ONLINE,
 124 };
 125
 126 static const struct power_supply_desc axp20x_ac_power_desc = {
 127         .name = "axp20x-ac",
 128         .type = POWER_SUPPLY_TYPE_MAINS,
 129         .properties = axp20x_ac_power_properties,
 130         .num_properties = ARRAY_SIZE(axp20x_ac_power_properties),
 131         .get_property = axp20x_ac_power_get_property,
 132 };
 133
 134 static const struct power_supply_desc axp22x_ac_power_desc = {
 135         .name = "axp22x-ac",
 136         .type = POWER_SUPPLY_TYPE_MAINS,
 137         .properties = axp22x_ac_power_properties,
 138         .num_properties = ARRAY_SIZE(axp22x_ac_power_properties),
 139         .get_property = axp20x_ac_power_get_property,
 140 };
 141
 142 struct axp_data {
 143         const struct power_supply_desc  *power_desc;
 144         bool                            acin_adc;
 145 };
 146
 147 static const struct axp_data axp20x_data = {
 148         .power_desc = &axp20x_ac_power_desc,
 149         .acin_adc = true,
 150 };
 151
 152 static const struct axp_data axp22x_data = {
 153         .power_desc = &axp22x_ac_power_desc,
 154         .acin_adc = false,
 155 };
 156
 157 static int axp20x_ac_power_probe(struct platform_device *pdev)
 158 {
 159         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 160         struct power_supply_config psy_cfg = {};
 161         struct axp20x_ac_power *power;
 162         struct axp_data *axp_data;
 163         static const char * const irq_names[] = { "ACIN_PLUGIN", "ACIN_REMOVAL",
 164                 NULL };
 165         int i, irq, ret;
 166
 167         if (!of_device_is_available(pdev->dev.of_node))
 168                 return -ENODEV;
 169
 170         if (!axp20x) {
 171                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 172                 return -EINVAL;
 173         }
 174
 175         power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 176         if (!power)
 177                 return -ENOMEM;
 178
 179         axp_data = (struct axp_data *)of_device_get_match_data(&pdev->dev);
 180
 181         if (axp_data->acin_adc) {
 182                 power->acin_v = devm_iio_channel_get(&pdev->dev, "acin_v");
 183                 if (IS_ERR(power->acin_v)) {
 184                         if (PTR_ERR(power->acin_v) == -ENODEV)
 185                                 return -EPROBE_DEFER;
 186                         return PTR_ERR(power->acin_v);
 187                 }
 188
 189                 power->acin_i = devm_iio_channel_get(&pdev->dev, "acin_i");
 190                 if (IS_ERR(power->acin_i)) {
 191                         if (PTR_ERR(power->acin_i) == -ENODEV)
 192                                 return -EPROBE_DEFER;
 193                         return PTR_ERR(power->acin_i);
 194                 }
 195         }
 196
 197         power->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 198
 199         platform_set_drvdata(pdev, power);
 200
 201         psy_cfg.of_node = pdev->dev.of_node;
 202         psy_cfg.drv_data = power;
 203
 204         power->supply = devm_power_supply_register(&pdev->dev,
 205                                                    axp_data->power_desc,
 206                                                    &psy_cfg);
 207         if (IS_ERR(power->supply))
 208                 return PTR_ERR(power->supply);
 209
 210         /* Request irqs after registering, as irqs may trigger immediately */
 211         for (i = 0; irq_names[i]; i++) {
 212                 irq = platform_get_irq_byname(pdev, irq_names[i]);
 213                 if (irq < 0) {
 214                         dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 215                                  irq_names[i], irq);
 216                         continue;
 217                 }
 218                 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 219                 ret = devm_request_any_context_irq(&pdev->dev, irq,
 220                                                    axp20x_ac_power_irq, 0,
 221                                                    DRVNAME, power);
 222                 if (ret < 0)
 223                         dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 224                                  irq_names[i], ret);
 225         }
 226
 227         return 0;
 228 }
 229
 230 static const struct of_device_id axp20x_ac_power_match[] = {
 231         {
 232                 .compatible = "x-powers,axp202-ac-power-supply",
 233                 .data = (void *)&axp20x_data,
 234         }, {
 235                 .compatible = "x-powers,axp221-ac-power-supply",
 236                 .data = (void *)&axp22x_data,
 237         }, { /* sentinel */ }
 238 };
 239 MODULE_DEVICE_TABLE(of, axp20x_ac_power_match);
 240
 241 static struct platform_driver axp20x_ac_power_driver = {
 242         .probe = axp20x_ac_power_probe,
 243         .driver = {
 244                 .name = DRVNAME,
 245                 .of_match_table = axp20x_ac_power_match,
 246         },
 247 };
 248
 249 module_platform_driver(axp20x_ac_power_driver);
 250
 251 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 252 MODULE_DESCRIPTION("AXP20X and AXP22X PMICs' AC power supply driver");
 253 MODULE_LICENSE("GPL");