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 AXP813_VBUS_CLIMIT_900mA        0
  46 #define AXP813_VBUS_CLIMIT_1500mA       1
  47 #define AXP813_VBUS_CLIMIT_2000mA       2
  48 #define AXP813_VBUS_CLIMIT_2500mA       3
  49
  50 #define AXP20X_ADC_EN1_VBUS_CURR        BIT(2)
  51 #define AXP20X_ADC_EN1_VBUS_VOLT        BIT(3)
  52
  53 #define AXP20X_VBUS_MON_VBUS_VALID      BIT(3)
  54
  55 /*
  56  * Note do not raise the debounce time, we must report Vusb high within
  57  * 100ms otherwise we get Vbus errors in musb.
  58  */
  59 #define DEBOUNCE_TIME                   msecs_to_jiffies(50)
  60
  61 struct axp20x_usb_power {
  62         struct device_node *np;
  63         struct regmap *regmap;
  64         struct power_supply *supply;
  65         enum axp20x_variants axp20x_id;
  66         struct iio_channel *vbus_v;
  67         struct iio_channel *vbus_i;
  68         struct delayed_work vbus_detect;
  69         unsigned int old_status;
  70 };
  71
  72 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
  73 {
  74         struct axp20x_usb_power *power = devid;
  75
  76         power_supply_changed(power->supply);
  77
  78         return IRQ_HANDLED;
  79 }
  80
  81 static void axp20x_usb_power_poll_vbus(struct work_struct *work)
  82 {
  83         struct axp20x_usb_power *power =
  84                 container_of(work, struct axp20x_usb_power, vbus_detect.work);
  85         unsigned int val;
  86         int ret;
  87
  88         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
  89         if (ret)
  90                 goto out;
  91
  92         val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
  93         if (val != power->old_status)
  94                 power_supply_changed(power->supply);
  95
  96         power->old_status = val;
  97
  98 out:
  99         mod_delayed_work(system_wq, &power->vbus_detect, DEBOUNCE_TIME);
 100 }
 101
 102 static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
 103 {
 104         if (power->axp20x_id >= AXP221_ID)
 105                 return true;
 106
 107         return false;
 108 }
 109
 110 static int axp20x_get_current_max(struct axp20x_usb_power *power, int *val)
 111 {
 112         unsigned int v;
 113         int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 114
 115         if (ret)
 116                 return ret;
 117
 118         switch (v & AXP20X_VBUS_CLIMIT_MASK) {
 119         case AXP20X_VBUS_CLIMIT_100mA:
 120                 if (power->axp20x_id == AXP221_ID)
 121                         *val = -1; /* No 100mA limit */
 122                 else
 123                         *val = 100000;
 124                 break;
 125         case AXP20X_VBUS_CLIMIT_500mA:
 126                 *val = 500000;
 127                 break;
 128         case AXP20X_VBUS_CLIMIT_900mA:
 129                 *val = 900000;
 130                 break;
 131         case AXP20X_VBUS_CLIMIT_NONE:
 132                 *val = -1;
 133                 break;
 134         }
 135
 136         return 0;
 137 }
 138
 139 static int axp813_get_current_max(struct axp20x_usb_power *power, int *val)
 140 {
 141         unsigned int v;
 142         int ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 143
 144         if (ret)
 145                 return ret;
 146
 147         switch (v & AXP20X_VBUS_CLIMIT_MASK) {
 148         case AXP813_VBUS_CLIMIT_900mA:
 149                 *val = 900000;
 150                 break;
 151         case AXP813_VBUS_CLIMIT_1500mA:
 152                 *val = 1500000;
 153                 break;
 154         case AXP813_VBUS_CLIMIT_2000mA:
 155                 *val = 2000000;
 156                 break;
 157         case AXP813_VBUS_CLIMIT_2500mA:
 158                 *val = 2500000;
 159                 break;
 160         }
 161         return 0;
 162 }
 163
 164 static int axp20x_usb_power_get_property(struct power_supply *psy,
 165         enum power_supply_property psp, union power_supply_propval *val)
 166 {
 167         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 168         unsigned int input, v;
 169         int ret;
 170
 171         switch (psp) {
 172         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 173                 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 174                 if (ret)
 175                         return ret;
 176
 177                 val->intval = AXP20X_VBUS_VHOLD_uV(v);
 178                 return 0;
 179         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 180                 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 181                         ret = iio_read_channel_processed(power->vbus_v,
 182                                                          &val->intval);
 183                         if (ret)
 184                                 return ret;
 185
 186                         /*
 187                          * IIO framework gives mV but Power Supply framework
 188                          * gives uV.
 189                          */
 190                         val->intval *= 1000;
 191                         return 0;
 192                 }
 193
 194                 ret = axp20x_read_variable_width(power->regmap,
 195                                                  AXP20X_VBUS_V_ADC_H, 12);
 196                 if (ret < 0)
 197                         return ret;
 198
 199                 val->intval = ret * 1700; /* 1 step = 1.7 mV */
 200                 return 0;
 201         case POWER_SUPPLY_PROP_CURRENT_MAX:
 202                 if (power->axp20x_id == AXP813_ID)
 203                         return axp813_get_current_max(power, &val->intval);
 204                 return axp20x_get_current_max(power, &val->intval);
 205         case POWER_SUPPLY_PROP_CURRENT_NOW:
 206                 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 207                         ret = iio_read_channel_processed(power->vbus_i,
 208                                                          &val->intval);
 209                         if (ret)
 210                                 return ret;
 211
 212                         /*
 213                          * IIO framework gives mA but Power Supply framework
 214                          * gives uA.
 215                          */
 216                         val->intval *= 1000;
 217                         return 0;
 218                 }
 219
 220                 ret = axp20x_read_variable_width(power->regmap,
 221                                                  AXP20X_VBUS_I_ADC_H, 12);
 222                 if (ret < 0)
 223                         return ret;
 224
 225                 val->intval = ret * 375; /* 1 step = 0.375 mA */
 226                 return 0;
 227         default:
 228                 break;
 229         }
 230
 231         /* All the properties below need the input-status reg value */
 232         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
 233         if (ret)
 234                 return ret;
 235
 236         switch (psp) {
 237         case POWER_SUPPLY_PROP_HEALTH:
 238                 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
 239                         val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
 240                         break;
 241                 }
 242
 243                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 244
 245                 if (power->axp20x_id == AXP202_ID) {
 246                         ret = regmap_read(power->regmap,
 247                                           AXP20X_USB_OTG_STATUS, &v);
 248                         if (ret)
 249                                 return ret;
 250
 251                         if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
 252                                 val->intval =
 253                                         POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 254                 }
 255                 break;
 256         case POWER_SUPPLY_PROP_PRESENT:
 257                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
 258                 break;
 259         case POWER_SUPPLY_PROP_ONLINE:
 260                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
 261                 break;
 262         default:
 263                 return -EINVAL;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
 270                                             int intval)
 271 {
 272         int val;
 273
 274         switch (intval) {
 275         case 4000000:
 276         case 4100000:
 277         case 4200000:
 278         case 4300000:
 279         case 4400000:
 280         case 4500000:
 281         case 4600000:
 282         case 4700000:
 283                 val = (intval - 4000000) / 100000;
 284                 return regmap_update_bits(power->regmap,
 285                                           AXP20X_VBUS_IPSOUT_MGMT,
 286                                           AXP20X_VBUS_VHOLD_MASK,
 287                                           val << AXP20X_VBUS_VHOLD_OFFSET);
 288         default:
 289                 return -EINVAL;
 290         }
 291
 292         return -EINVAL;
 293 }
 294
 295 static int axp813_usb_power_set_current_max(struct axp20x_usb_power *power,
 296                                             int intval)
 297 {
 298         int val;
 299
 300         switch (intval) {
 301         case 900000:
 302                 return regmap_update_bits(power->regmap,
 303                                           AXP20X_VBUS_IPSOUT_MGMT,
 304                                           AXP20X_VBUS_CLIMIT_MASK,
 305                                           AXP813_VBUS_CLIMIT_900mA);
 306         case 1500000:
 307         case 2000000:
 308         case 2500000:
 309                 val = (intval - 1000000) / 500000;
 310                 return regmap_update_bits(power->regmap,
 311                                           AXP20X_VBUS_IPSOUT_MGMT,
 312                                           AXP20X_VBUS_CLIMIT_MASK, val);
 313         default:
 314                 return -EINVAL;
 315         }
 316
 317         return -EINVAL;
 318 }
 319
 320 static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
 321                                             int intval)
 322 {
 323         int val;
 324
 325         switch (intval) {
 326         case 100000:
 327                 if (power->axp20x_id == AXP221_ID)
 328                         return -EINVAL;
 329                 /* fall through */
 330         case 500000:
 331         case 900000:
 332                 val = (900000 - intval) / 400000;
 333                 return regmap_update_bits(power->regmap,
 334                                           AXP20X_VBUS_IPSOUT_MGMT,
 335                                           AXP20X_VBUS_CLIMIT_MASK, val);
 336         default:
 337                 return -EINVAL;
 338         }
 339
 340         return -EINVAL;
 341 }
 342
 343 static int axp20x_usb_power_set_property(struct power_supply *psy,
 344                                          enum power_supply_property psp,
 345                                          const union power_supply_propval *val)
 346 {
 347         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 348
 349         switch (psp) {
 350         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 351                 return axp20x_usb_power_set_voltage_min(power, val->intval);
 352
 353         case POWER_SUPPLY_PROP_CURRENT_MAX:
 354                 if (power->axp20x_id == AXP813_ID)
 355                         return axp813_usb_power_set_current_max(power,
 356                                                                 val->intval);
 357                 return axp20x_usb_power_set_current_max(power, val->intval);
 358
 359         default:
 360                 return -EINVAL;
 361         }
 362
 363         return -EINVAL;
 364 }
 365
 366 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
 367                                            enum power_supply_property psp)
 368 {
 369         return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 370                psp == POWER_SUPPLY_PROP_CURRENT_MAX;
 371 }
 372
 373 static enum power_supply_property axp20x_usb_power_properties[] = {
 374         POWER_SUPPLY_PROP_HEALTH,
 375         POWER_SUPPLY_PROP_PRESENT,
 376         POWER_SUPPLY_PROP_ONLINE,
 377         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 378         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 379         POWER_SUPPLY_PROP_CURRENT_MAX,
 380         POWER_SUPPLY_PROP_CURRENT_NOW,
 381 };
 382
 383 static enum power_supply_property axp22x_usb_power_properties[] = {
 384         POWER_SUPPLY_PROP_HEALTH,
 385         POWER_SUPPLY_PROP_PRESENT,
 386         POWER_SUPPLY_PROP_ONLINE,
 387         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 388         POWER_SUPPLY_PROP_CURRENT_MAX,
 389 };
 390
 391 static const struct power_supply_desc axp20x_usb_power_desc = {
 392         .name = "axp20x-usb",
 393         .type = POWER_SUPPLY_TYPE_USB,
 394         .properties = axp20x_usb_power_properties,
 395         .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
 396         .property_is_writeable = axp20x_usb_power_prop_writeable,
 397         .get_property = axp20x_usb_power_get_property,
 398         .set_property = axp20x_usb_power_set_property,
 399 };
 400
 401 static const struct power_supply_desc axp22x_usb_power_desc = {
 402         .name = "axp20x-usb",
 403         .type = POWER_SUPPLY_TYPE_USB,
 404         .properties = axp22x_usb_power_properties,
 405         .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
 406         .property_is_writeable = axp20x_usb_power_prop_writeable,
 407         .get_property = axp20x_usb_power_get_property,
 408         .set_property = axp20x_usb_power_set_property,
 409 };
 410
 411 static int configure_iio_channels(struct platform_device *pdev,
 412                                   struct axp20x_usb_power *power)
 413 {
 414         power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
 415         if (IS_ERR(power->vbus_v)) {
 416                 if (PTR_ERR(power->vbus_v) == -ENODEV)
 417                         return -EPROBE_DEFER;
 418                 return PTR_ERR(power->vbus_v);
 419         }
 420
 421         power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
 422         if (IS_ERR(power->vbus_i)) {
 423                 if (PTR_ERR(power->vbus_i) == -ENODEV)
 424                         return -EPROBE_DEFER;
 425                 return PTR_ERR(power->vbus_i);
 426         }
 427
 428         return 0;
 429 }
 430
 431 static int configure_adc_registers(struct axp20x_usb_power *power)
 432 {
 433         /* Enable vbus voltage and current measurement */
 434         return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
 435                                   AXP20X_ADC_EN1_VBUS_CURR |
 436                                   AXP20X_ADC_EN1_VBUS_VOLT,
 437                                   AXP20X_ADC_EN1_VBUS_CURR |
 438                                   AXP20X_ADC_EN1_VBUS_VOLT);
 439 }
 440
 441 static int axp20x_usb_power_probe(struct platform_device *pdev)
 442 {
 443         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 444         struct power_supply_config psy_cfg = {};
 445         struct axp20x_usb_power *power;
 446         static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
 447                 "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
 448         static const char * const axp22x_irq_names[] = {
 449                 "VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
 450         const char * const *irq_names;
 451         const struct power_supply_desc *usb_power_desc;
 452         int i, irq, ret;
 453
 454         if (!of_device_is_available(pdev->dev.of_node))
 455                 return -ENODEV;
 456
 457         if (!axp20x) {
 458                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 459                 return -EINVAL;
 460         }
 461
 462         power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
 463         if (!power)
 464                 return -ENOMEM;
 465
 466         platform_set_drvdata(pdev, power);
 467         power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
 468                                                                 &pdev->dev);
 469
 470         power->np = pdev->dev.of_node;
 471         power->regmap = axp20x->regmap;
 472
 473         if (power->axp20x_id == AXP202_ID) {
 474                 /* Enable vbus valid checking */
 475                 ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
 476                                          AXP20X_VBUS_MON_VBUS_VALID,
 477                                          AXP20X_VBUS_MON_VBUS_VALID);
 478                 if (ret)
 479                         return ret;
 480
 481                 if (IS_ENABLED(CONFIG_AXP20X_ADC))
 482                         ret = configure_iio_channels(pdev, power);
 483                 else
 484                         ret = configure_adc_registers(power);
 485
 486                 if (ret)
 487                         return ret;
 488
 489                 usb_power_desc = &axp20x_usb_power_desc;
 490                 irq_names = axp20x_irq_names;
 491         } else if (power->axp20x_id == AXP221_ID ||
 492                    power->axp20x_id == AXP223_ID ||
 493                    power->axp20x_id == AXP813_ID) {
 494                 usb_power_desc = &axp22x_usb_power_desc;
 495                 irq_names = axp22x_irq_names;
 496         } else {
 497                 dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
 498                         axp20x->variant);
 499                 return -EINVAL;
 500         }
 501
 502         psy_cfg.of_node = pdev->dev.of_node;
 503         psy_cfg.drv_data = power;
 504
 505         power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
 506                                                    &psy_cfg);
 507         if (IS_ERR(power->supply))
 508                 return PTR_ERR(power->supply);
 509
 510         /* Request irqs after registering, as irqs may trigger immediately */
 511         for (i = 0; irq_names[i]; i++) {
 512                 irq = platform_get_irq_byname(pdev, irq_names[i]);
 513                 if (irq < 0) {
 514                         dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
 515                                  irq_names[i], irq);
 516                         continue;
 517                 }
 518                 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 519                 ret = devm_request_any_context_irq(&pdev->dev, irq,
 520                                 axp20x_usb_power_irq, 0, DRVNAME, power);
 521                 if (ret < 0)
 522                         dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
 523                                  irq_names[i], ret);
 524         }
 525
 526         INIT_DELAYED_WORK(&power->vbus_detect, axp20x_usb_power_poll_vbus);
 527         if (axp20x_usb_vbus_needs_polling(power))
 528                 queue_delayed_work(system_wq, &power->vbus_detect, 0);
 529
 530         return 0;
 531 }
 532
 533 static int axp20x_usb_power_remove(struct platform_device *pdev)
 534 {
 535         struct axp20x_usb_power *power = platform_get_drvdata(pdev);
 536
 537         cancel_delayed_work_sync(&power->vbus_detect);
 538
 539         return 0;
 540 }
 541
 542 static const struct of_device_id axp20x_usb_power_match[] = {
 543         {
 544                 .compatible = "x-powers,axp202-usb-power-supply",
 545                 .data = (void *)AXP202_ID,
 546         }, {
 547                 .compatible = "x-powers,axp221-usb-power-supply",
 548                 .data = (void *)AXP221_ID,
 549         }, {
 550                 .compatible = "x-powers,axp223-usb-power-supply",
 551                 .data = (void *)AXP223_ID,
 552         }, {
 553                 .compatible = "x-powers,axp813-usb-power-supply",
 554                 .data = (void *)AXP813_ID,
 555         }, { /* sentinel */ }
 556 };
 557 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
 558
 559 static struct platform_driver axp20x_usb_power_driver = {
 560         .probe = axp20x_usb_power_probe,
 561         .remove = axp20x_usb_power_remove,
 562         .driver = {
 563                 .name = DRVNAME,
 564                 .of_match_table = axp20x_usb_power_match,
 565         },
 566 };
 567
 568 module_platform_driver(axp20x_usb_power_driver);
 569
 570 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 571 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
 572 MODULE_LICENSE("GPL");