drivers/power/axp20x_usb_power.c

   1 /*
   2  * AXP20x PMIC USB power supply status driver
   3  *
   4  * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
   5  * Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
   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/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/regmap.h>
  23 #include <linux/slab.h>
  24
  25 #define DRVNAME "axp20x-usb-power-supply"
  26
  27 #define AXP20X_PWR_STATUS_VBUS_PRESENT  BIT(5)
  28 #define AXP20X_PWR_STATUS_VBUS_USED     BIT(4)
  29
  30 #define AXP20X_USB_STATUS_VBUS_VALID    BIT(2)
  31
  32 #define AXP20X_VBUS_VHOLD_uV(b)         (4000000 + (((b) >> 3) & 7) * 100000)
  33 #define AXP20X_VBUS_CLIMIT_MASK         3
  34 #define AXP20X_VBUC_CLIMIT_900mA        0
  35 #define AXP20X_VBUC_CLIMIT_500mA        1
  36 #define AXP20X_VBUC_CLIMIT_100mA        2
  37 #define AXP20X_VBUC_CLIMIT_NONE         3
  38
  39 #define AXP20X_ADC_EN1_VBUS_CURR        BIT(2)
  40 #define AXP20X_ADC_EN1_VBUS_VOLT        BIT(3)
  41
  42 #define AXP20X_VBUS_MON_VBUS_VALID      BIT(3)
  43
  44 struct axp20x_usb_power {
  45         struct device_node *np;
  46         struct regmap *regmap;
  47         struct power_supply *supply;
  48 };
  49
  50 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
  51 {
  52         struct axp20x_usb_power *power = devid;
  53
  54         power_supply_changed(power->supply);
  55
  56         return IRQ_HANDLED;
  57 }
  58
  59 static int axp20x_usb_power_get_property(struct power_supply *psy,
  60         enum power_supply_property psp, union power_supply_propval *val)
  61 {
  62         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
  63         unsigned int input, v;
  64         int ret;
  65
  66         switch (psp) {
  67         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
  68                 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
  69                 if (ret)
  70                         return ret;
  71
  72                 val->intval = AXP20X_VBUS_VHOLD_uV(v);
  73                 return 0;
  74         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  75                 ret = axp20x_read_variable_width(power->regmap,
  76                                                  AXP20X_VBUS_V_ADC_H, 12);
  77                 if (ret < 0)
  78                         return ret;
  79
  80                 val->intval = ret * 1700; /* 1 step = 1.7 mV */
  81                 return 0;
  82         case POWER_SUPPLY_PROP_CURRENT_MAX:
  83                 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
  84                 if (ret)
  85                         return ret;
  86
  87                 switch (v & AXP20X_VBUS_CLIMIT_MASK) {
  88                 case AXP20X_VBUC_CLIMIT_100mA:
  89                         if (of_device_is_compatible(power->np,
  90                                         "x-powers,axp202-usb-power-supply")) {
  91                                 val->intval = 100000;
  92                         } else {
  93                                 val->intval = -1; /* No 100mA limit */
  94                         }
  95                         break;
  96                 case AXP20X_VBUC_CLIMIT_500mA:
  97                         val->intval = 500000;
  98                         break;
  99                 case AXP20X_VBUC_CLIMIT_900mA:
 100                         val->intval = 900000;
 101                         break;
 102                 case AXP20X_VBUC_CLIMIT_NONE:
 103                         val->intval = -1;
 104                         break;
 105                 }
 106                 return 0;
 107         case POWER_SUPPLY_PROP_CURRENT_NOW:
 108                 ret = axp20x_read_variable_width(power->regmap,
 109                                                  AXP20X_VBUS_I_ADC_H, 12);
 110                 if (ret < 0)
 111                         return ret;
 112
 113                 val->intval = ret * 375; /* 1 step = 0.375 mA */
 114                 return 0;
 115         default:
 116                 break;
 117         }
 118
 119         /* All the properties below need the input-status reg value */
 120         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
 121         if (ret)
 122                 return ret;
 123
 124         switch (psp) {
 125         case POWER_SUPPLY_PROP_HEALTH:
 126                 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
 127                         val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
 128                         break;
 129                 }
 130
 131                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 132
 133                 if (of_device_is_compatible(power->np,
 134                                 "x-powers,axp202-usb-power-supply")) {
 135                         ret = regmap_read(power->regmap,
 136                                           AXP20X_USB_OTG_STATUS, &v);
 137                         if (ret)
 138                                 return ret;
 139
 140                         if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
 141                                 val->intval =
 142                                         POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 143                 }
 144                 break;
 145         case POWER_SUPPLY_PROP_PRESENT:
 146                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
 147                 break;
 148         case POWER_SUPPLY_PROP_ONLINE:
 149                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
 150                 break;
 151         default:
 152                 return -EINVAL;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static enum power_supply_property axp20x_usb_power_properties[] = {
 159         POWER_SUPPLY_PROP_HEALTH,
 160         POWER_SUPPLY_PROP_PRESENT,
 161         POWER_SUPPLY_PROP_ONLINE,
 162         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 163         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 164         POWER_SUPPLY_PROP_CURRENT_MAX,
 165         POWER_SUPPLY_PROP_CURRENT_NOW,
 166 };
 167
 168 static enum power_supply_property axp22x_usb_power_properties[] = {
 169         POWER_SUPPLY_PROP_HEALTH,
 170         POWER_SUPPLY_PROP_PRESENT,
 171         POWER_SUPPLY_PROP_ONLINE,
 172         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 173         POWER_SUPPLY_PROP_CURRENT_MAX,
 174 };
 175
 176 static const struct power_supply_desc axp20x_usb_power_desc = {
 177         .name = "axp20x-usb",
 178         .type = POWER_SUPPLY_TYPE_USB,
 179         .properties = axp20x_usb_power_properties,
 180         .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
 181         .get_property = axp20x_usb_power_get_property,
 182 };
 183
 184 static const struct power_supply_desc axp22x_usb_power_desc = {
 185         .name = "axp20x-usb",
 186         .type = POWER_SUPPLY_TYPE_USB,
 187         .properties = axp22x_usb_power_properties,
 188         .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
 189         .get_property = axp20x_usb_power_get_property,
 190 };
 191
 192 static int axp20x_usb_power_probe(struct platform_device *pdev)
 193 {
 194         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 195         struct power_supply_config psy_cfg = {};
 196         struct axp20x_usb_power *power;
 197         static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
 198                 "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
 199         static const char * const axp22x_irq_names[] = {
 200                 "VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
 201         static const char * const *irq_names;
 202         const struct power_supply_desc *usb_power_desc;
 203         int i, irq, ret;
 204
 205         if (!of_device_is_available(pdev->dev.of_node))
 206                 return -ENODEV;
 207
 208         if (!axp20x) {
 209                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 210                 return -EINVAL;
 211         }
 212
 213         power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 214         if (!power)
 215                 return -ENOMEM;
 216
 217         power->np = pdev->dev.of_node;
 218         power->regmap = axp20x->regmap;
 219
 220         if (of_device_is_compatible(power->np,
 221                         "x-powers,axp202-usb-power-supply")) {
 222                 /* Enable vbus valid checking */
 223                 ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
 224                                          AXP20X_VBUS_MON_VBUS_VALID,
 225                                          AXP20X_VBUS_MON_VBUS_VALID);
 226                 if (ret)
 227                         return ret;
 228
 229                 /* Enable vbus voltage and current measurement */
 230                 ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
 231                         AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT,
 232                         AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT);
 233                 if (ret)
 234                         return ret;
 235
 236                 usb_power_desc = &axp20x_usb_power_desc;
 237                 irq_names = axp20x_irq_names;
 238         } else if (of_device_is_compatible(power->np,
 239                         "x-powers,axp221-usb-power-supply")) {
 240                 usb_power_desc = &axp22x_usb_power_desc;
 241                 irq_names = axp22x_irq_names;
 242         } else {
 243                 dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
 244                         axp20x->variant);
 245                 return -EINVAL;
 246         }
 247
 248         psy_cfg.of_node = pdev->dev.of_node;
 249         psy_cfg.drv_data = power;
 250
 251         power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
 252                                                    &psy_cfg);
 253         if (IS_ERR(power->supply))
 254                 return PTR_ERR(power->supply);
 255
 256         /* Request irqs after registering, as irqs may trigger immediately */
 257         for (i = 0; irq_names[i]; i++) {
 258                 irq = platform_get_irq_byname(pdev, irq_names[i]);
 259                 if (irq < 0) {
 260                         dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 261                                  irq_names[i], irq);
 262                         continue;
 263                 }
 264                 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 265                 ret = devm_request_any_context_irq(&pdev->dev, irq,
 266                                 axp20x_usb_power_irq, 0, DRVNAME, power);
 267                 if (ret < 0)
 268                         dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 269                                  irq_names[i], ret);
 270         }
 271
 272         return 0;
 273 }
 274
 275 static const struct of_device_id axp20x_usb_power_match[] = {
 276         { .compatible = "x-powers,axp202-usb-power-supply" },
 277         { .compatible = "x-powers,axp221-usb-power-supply" },
 278         { }
 279 };
 280 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
 281
 282 static struct platform_driver axp20x_usb_power_driver = {
 283         .probe = axp20x_usb_power_probe,
 284         .driver = {
 285                 .name = DRVNAME,
 286                 .of_match_table = axp20x_usb_power_match,
 287         },
 288 };
 289
 290 module_platform_driver(axp20x_usb_power_driver);
 291
 292 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 293 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
 294 MODULE_LICENSE("GPL");