drivers/power/supply/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/bitops.h>
  14 #include <linux/device.h>
  15 #include <linux/init.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mfd/axp20x.h>
  19 #include <linux/module.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/regmap.h>
  25 #include <linux/slab.h>
  26 #include <linux/iio/consumer.h>
  27 #include <linux/workqueue.h>
  28
  29 #define DRVNAME "axp20x-usb-power-supply"
  30
  31 #define AXP20X_PWR_STATUS_VBUS_PRESENT  BIT(5)
  32 #define AXP20X_PWR_STATUS_VBUS_USED     BIT(4)
  33
  34 #define AXP20X_USB_STATUS_VBUS_VALID    BIT(2)
  35
  36 #define AXP20X_VBUS_VHOLD_uV(b)         (4000000 + (((b) >> 3) & 7) * 100000)
  37 #define AXP20X_VBUS_VHOLD_MASK          GENMASK(5, 3)
  38 #define AXP20X_VBUS_VHOLD_OFFSET        3
  39 #define AXP20X_VBUS_CLIMIT_MASK         3
  40 #define AXP20X_VBUS_CLIMIT_900mA        0
  41 #define AXP20X_VBUS_CLIMIT_500mA        1
  42 #define AXP20X_VBUS_CLIMIT_100mA        2
  43 #define AXP20X_VBUS_CLIMIT_NONE         3
  44
  45 #define AXP20X_ADC_EN1_VBUS_CURR        BIT(2)
  46 #define AXP20X_ADC_EN1_VBUS_VOLT        BIT(3)
  47
  48 #define AXP20X_VBUS_MON_VBUS_VALID      BIT(3)
  49
  50 /*
  51  * Note do not raise the debounce time, we must report Vusb high within
  52  * 100ms otherwise we get Vbus errors in musb.
  53  */
  54 #define DEBOUNCE_TIME                   msecs_to_jiffies(50)
  55
  56 struct axp20x_usb_power {
  57         struct device_node *np;
  58         struct regmap *regmap;
  59         struct power_supply *supply;
  60         enum axp20x_variants axp20x_id;
  61         struct iio_channel *vbus_v;
  62         struct iio_channel *vbus_i;
  63         struct delayed_work vbus_detect;
  64         unsigned int old_status;
  65 };
  66
  67 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
  68 {
  69         struct axp20x_usb_power *power = devid;
  70
  71         power_supply_changed(power->supply);
  72
  73         return IRQ_HANDLED;
  74 }
  75
  76 static void axp20x_usb_power_poll_vbus(struct work_struct *work)
  77 {
  78         struct axp20x_usb_power *power =
  79                 container_of(work, struct axp20x_usb_power, vbus_detect.work);
  80         unsigned int val;
  81         int ret;
  82
  83         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
  84         if (ret)
  85                 goto out;
  86
  87         val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
  88         if (val != power->old_status)
  89                 power_supply_changed(power->supply);
  90
  91         power->old_status = val;
  92
  93 out:
  94         mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
  95 }
  96
  97 static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
  98 {
  99         if (power->axp20x_id >= AXP221_ID)
 100                 return true;
 101
 102         return false;
 103 }
 104
 105 static int axp20x_usb_power_get_property(struct power_supply *psy,
 106         enum power_supply_property psp, union power_supply_propval *val)
 107 {
 108         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 109         unsigned int input, v;
 110         int ret;
 111
 112         switch (psp) {
 113         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 114                 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 115                 if (ret)
 116                         return ret;
 117
 118                 val->intval = AXP20X_VBUS_VHOLD_uV(v);
 119                 return 0;
 120         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 121                 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 122                         ret = iio_read_channel_processed(power->vbus_v,
 123                                                          &val->intval);
 124                         if (ret)
 125                                 return ret;
 126
 127                         /*
 128                          * IIO framework gives mV but Power Supply framework
 129                          * gives uV.
 130                          */
 131                         val->intval *= 1000;
 132                         return 0;
 133                 }
 134
 135                 ret = axp20x_read_variable_width(power->regmap,
 136                                                  AXP20X_VBUS_V_ADC_H, 12);
 137                 if (ret < 0)
 138                         return ret;
 139
 140                 val->intval = ret * 1700; /* 1 step = 1.7 mV */
 141                 return 0;
 142         case POWER_SUPPLY_PROP_CURRENT_MAX:
 143                 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 144                 if (ret)
 145                         return ret;
 146
 147                 switch (v & AXP20X_VBUS_CLIMIT_MASK) {
 148                 case AXP20X_VBUS_CLIMIT_100mA:
 149                         if (power->axp20x_id == AXP221_ID)
 150                                 val->intval = -1; /* No 100mA limit */
 151                         else
 152                                 val->intval = 100000;
 153                         break;
 154                 case AXP20X_VBUS_CLIMIT_500mA:
 155                         val->intval = 500000;
 156                         break;
 157                 case AXP20X_VBUS_CLIMIT_900mA:
 158                         val->intval = 900000;
 159                         break;
 160                 case AXP20X_VBUS_CLIMIT_NONE:
 161                         val->intval = -1;
 162                         break;
 163                 }
 164                 return 0;
 165         case POWER_SUPPLY_PROP_CURRENT_NOW:
 166                 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 167                         ret = iio_read_channel_processed(power->vbus_i,
 168                                                          &val->intval);
 169                         if (ret)
 170                                 return ret;
 171
 172                         /*
 173                          * IIO framework gives mA but Power Supply framework
 174                          * gives uA.
 175                          */
 176                         val->intval *= 1000;
 177                         return 0;
 178                 }
 179
 180                 ret = axp20x_read_variable_width(power->regmap,
 181                                                  AXP20X_VBUS_I_ADC_H, 12);
 182                 if (ret < 0)
 183                         return ret;
 184
 185                 val->intval = ret * 375; /* 1 step = 0.375 mA */
 186                 return 0;
 187         default:
 188                 break;
 189         }
 190
 191         /* All the properties below need the input-status reg value */
 192         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
 193         if (ret)
 194                 return ret;
 195
 196         switch (psp) {
 197         case POWER_SUPPLY_PROP_HEALTH:
 198                 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
 199                         val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
 200                         break;
 201                 }
 202
 203                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 204
 205                 if (power->axp20x_id == AXP202_ID) {
 206                         ret = regmap_read(power->regmap,
 207                                           AXP20X_USB_OTG_STATUS, &v);
 208                         if (ret)
 209                                 return ret;
 210
 211                         if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
 212                                 val->intval =
 213                                         POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 214                 }
 215                 break;
 216         case POWER_SUPPLY_PROP_PRESENT:
 217                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
 218                 break;
 219         case POWER_SUPPLY_PROP_ONLINE:
 220                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
 230                                             int intval)
 231 {
 232         int val;
 233
 234         switch (intval) {
 235         case 4000000:
 236         case 4100000:
 237         case 4200000:
 238         case 4300000:
 239         case 4400000:
 240         case 4500000:
 241         case 4600000:
 242         case 4700000:
 243                 val = (intval - 4000000) / 100000;
 244                 return regmap_update_bits(power->regmap,
 245                                           AXP20X_VBUS_IPSOUT_MGMT,
 246                                           AXP20X_VBUS_VHOLD_MASK,
 247                                           val << AXP20X_VBUS_VHOLD_OFFSET);
 248         default:
 249                 return -EINVAL;
 250         }
 251
 252         return -EINVAL;
 253 }
 254
 255 static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
 256                                             int intval)
 257 {
 258         int val;
 259
 260         switch (intval) {
 261         case 100000:
 262                 if (power->axp20x_id == AXP221_ID)
 263                         return -EINVAL;
 264                 /* fall through */
 265         case 500000:
 266         case 900000:
 267                 val = (900000 - intval) / 400000;
 268                 return regmap_update_bits(power->regmap,
 269                                           AXP20X_VBUS_IPSOUT_MGMT,
 270                                           AXP20X_VBUS_CLIMIT_MASK, val);
 271         default:
 272                 return -EINVAL;
 273         }
 274
 275         return -EINVAL;
 276 }
 277
 278 static int axp20x_usb_power_set_property(struct power_supply *psy,
 279                                          enum power_supply_property psp,
 280                                          const union power_supply_propval *val)
 281 {
 282         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 283
 284         switch (psp) {
 285         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 286                 return axp20x_usb_power_set_voltage_min(power, val->intval);
 287
 288         case POWER_SUPPLY_PROP_CURRENT_MAX:
 289                 return axp20x_usb_power_set_current_max(power, val->intval);
 290
 291         default:
 292                 return -EINVAL;
 293         }
 294
 295         return -EINVAL;
 296 }
 297
 298 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
 299                                            enum power_supply_property psp)
 300 {
 301         return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 302                psp == POWER_SUPPLY_PROP_CURRENT_MAX;
 303 }
 304
 305 static enum power_supply_property axp20x_usb_power_properties[] = {
 306         POWER_SUPPLY_PROP_HEALTH,
 307         POWER_SUPPLY_PROP_PRESENT,
 308         POWER_SUPPLY_PROP_ONLINE,
 309         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 310         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 311         POWER_SUPPLY_PROP_CURRENT_MAX,
 312         POWER_SUPPLY_PROP_CURRENT_NOW,
 313 };
 314
 315 static enum power_supply_property axp22x_usb_power_properties[] = {
 316         POWER_SUPPLY_PROP_HEALTH,
 317         POWER_SUPPLY_PROP_PRESENT,
 318         POWER_SUPPLY_PROP_ONLINE,
 319         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 320         POWER_SUPPLY_PROP_CURRENT_MAX,
 321 };
 322
 323 static const struct power_supply_desc axp20x_usb_power_desc = {
 324         .name = "axp20x-usb",
 325         .type = POWER_SUPPLY_TYPE_USB,
 326         .properties = axp20x_usb_power_properties,
 327         .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
 328         .property_is_writeable = axp20x_usb_power_prop_writeable,
 329         .get_property = axp20x_usb_power_get_property,
 330         .set_property = axp20x_usb_power_set_property,
 331 };
 332
 333 static const struct power_supply_desc axp22x_usb_power_desc = {
 334         .name = "axp20x-usb",
 335         .type = POWER_SUPPLY_TYPE_USB,
 336         .properties = axp22x_usb_power_properties,
 337         .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
 338         .property_is_writeable = axp20x_usb_power_prop_writeable,
 339         .get_property = axp20x_usb_power_get_property,
 340         .set_property = axp20x_usb_power_set_property,
 341 };
 342
 343 static int configure_iio_channels(struct platform_device *pdev,
 344                                   struct axp20x_usb_power *power)
 345 {
 346         power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
 347         if (IS_ERR(power->vbus_v)) {
 348                 if (PTR_ERR(power->vbus_v) == -ENODEV)
 349                         return -EPROBE_DEFER;
 350                 return PTR_ERR(power->vbus_v);
 351         }
 352
 353         power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
 354         if (IS_ERR(power->vbus_i)) {
 355                 if (PTR_ERR(power->vbus_i) == -ENODEV)
 356                         return -EPROBE_DEFER;
 357                 return PTR_ERR(power->vbus_i);
 358         }
 359
 360         return 0;
 361 }
 362
 363 static int configure_adc_registers(struct axp20x_usb_power *power)
 364 {
 365         /* Enable vbus voltage and current measurement */
 366         return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
 367                                   AXP20X_ADC_EN1_VBUS_CURR |
 368                                   AXP20X_ADC_EN1_VBUS_VOLT,
 369                                   AXP20X_ADC_EN1_VBUS_CURR |
 370                                   AXP20X_ADC_EN1_VBUS_VOLT);
 371 }
 372
 373 static int axp20x_usb_power_probe(struct platform_device *pdev)
 374 {
 375         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 376         struct power_supply_config psy_cfg = {};
 377         struct axp20x_usb_power *power;
 378         static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
 379                 "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
 380         static const char * const axp22x_irq_names[] = {
 381                 "VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
 382         const char * const *irq_names;
 383         const struct power_supply_desc *usb_power_desc;
 384         int i, irq, ret;
 385
 386         if (!of_device_is_available(pdev->dev.of_node))
 387                 return -ENODEV;
 388
 389         if (!axp20x) {
 390                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 391                 return -EINVAL;
 392         }
 393
 394         power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 395         if (!power)
 396                 return -ENOMEM;
 397
 398         platform_set_drvdata(pdev, power);
 399         power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
 400                                                                 &pdev->dev);
 401
 402         power->np = pdev->dev.of_node;
 403         power->regmap = axp20x->regmap;
 404
 405         if (power->axp20x_id == AXP202_ID) {
 406                 /* Enable vbus valid checking */
 407                 ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
 408                                          AXP20X_VBUS_MON_VBUS_VALID,
 409                                          AXP20X_VBUS_MON_VBUS_VALID);
 410                 if (ret)
 411                         return ret;
 412
 413                 if (IS_ENABLED(CONFIG_AXP20X_ADC))
 414                         ret = configure_iio_channels(pdev, power);
 415                 else
 416                         ret = configure_adc_registers(power);
 417
 418                 if (ret)
 419                         return ret;
 420
 421                 usb_power_desc = &axp20x_usb_power_desc;
 422                 irq_names = axp20x_irq_names;
 423         } else if (power->axp20x_id == AXP221_ID ||
 424                    power->axp20x_id == AXP223_ID) {
 425                 usb_power_desc = &axp22x_usb_power_desc;
 426                 irq_names = axp22x_irq_names;
 427         } else {
 428                 dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
 429                         axp20x->variant);
 430                 return -EINVAL;
 431         }
 432
 433         psy_cfg.of_node = pdev->dev.of_node;
 434         psy_cfg.drv_data = power;
 435
 436         power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
 437                                                    &psy_cfg);
 438         if (IS_ERR(power->supply))
 439                 return PTR_ERR(power->supply);
 440
 441         /* Request irqs after registering, as irqs may trigger immediately */
 442         for (i = 0; irq_names[i]; i++) {
 443                 irq = platform_get_irq_byname(pdev, irq_names[i]);
 444                 if (irq < 0) {
 445                         dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 446                                  irq_names[i], irq);
 447                         continue;
 448                 }
 449                 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 450                 ret = devm_request_any_context_irq(&pdev->dev, irq,
 451                                 axp20x_usb_power_irq, 0, DRVNAME, power);
 452                 if (ret < 0)
 453                         dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 454                                  irq_names[i], ret);
 455         }
 456
 457         INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
 458         if (axp20x_usb_vbus_needs_polling(power))
 459                 queue_delayed_work(system_wq, &power->vbus_detect, 0);
 460
 461         return 0;
 462 }
 463
 464 static int axp20x_usb_power_remove(struct platform_device *pdev)
 465 {
 466         struct axp20x_usb_power *power = platform_get_drvdata(pdev);
 467
 468         cancel_delayed_work_sync(&power->vbus_detect);
 469
 470         return 0;
 471 }
 472
 473 static const struct of_device_id axp20x_usb_power_match[] = {
 474         {
 475                 .compatible = "x-powers,axp202-usb-power-supply",
 476                 .data = (void *)AXP202_ID,
 477         }, {
 478                 .compatible = "x-powers,axp221-usb-power-supply",
 479                 .data = (void *)AXP221_ID,
 480         }, {
 481                 .compatible = "x-powers,axp223-usb-power-supply",
 482                 .data = (void *)AXP223_ID,
 483         }, { /* sentinel */ }
 484 };
 485 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
 486
 487 static struct platform_driver axp20x_usb_power_driver = {
 488         .probe = axp20x_usb_power_probe,
 489         .remove = axp20x_usb_power_remove,
 490         .driver = {
 491                 .name = DRVNAME,
 492                 .of_match_table = axp20x_usb_power_match,
 493         },
 494 };
 495
 496 module_platform_driver(axp20x_usb_power_driver);
 497
 498 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 499 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
 500 MODULE_LICENSE("GPL");