root/drivers/power/supply/max8903_charger.c

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DEFINITIONS

This source file includes following definitions.
  1. max8903_get_property
  2. max8903_dcin
  3. max8903_usbin
  4. max8903_fault
  5. max8903_parse_dt_data
  6. max8903_setup_gpios
  7. max8903_probe

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
   4  *
   5  * Copyright (C) 2011 Samsung Electronics
   6  * MyungJoo Ham <myungjoo.ham@samsung.com>
   7  */
   8 
   9 #include <linux/gpio.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_gpio.h>
  15 #include <linux/slab.h>
  16 #include <linux/power_supply.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/power/max8903_charger.h>
  19 
  20 struct max8903_data {
  21         struct max8903_pdata *pdata;
  22         struct device *dev;
  23         struct power_supply *psy;
  24         struct power_supply_desc psy_desc;
  25         bool fault;
  26         bool usb_in;
  27         bool ta_in;
  28 };
  29 
  30 static enum power_supply_property max8903_charger_props[] = {
  31         POWER_SUPPLY_PROP_STATUS, /* Charger status output */
  32         POWER_SUPPLY_PROP_ONLINE, /* External power source */
  33         POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
  34 };
  35 
  36 static int max8903_get_property(struct power_supply *psy,
  37                 enum power_supply_property psp,
  38                 union power_supply_propval *val)
  39 {
  40         struct max8903_data *data = power_supply_get_drvdata(psy);
  41 
  42         switch (psp) {
  43         case POWER_SUPPLY_PROP_STATUS:
  44                 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  45                 if (gpio_is_valid(data->pdata->chg)) {
  46                         if (gpio_get_value(data->pdata->chg) == 0)
  47                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
  48                         else if (data->usb_in || data->ta_in)
  49                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  50                         else
  51                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  52                 }
  53                 break;
  54         case POWER_SUPPLY_PROP_ONLINE:
  55                 val->intval = 0;
  56                 if (data->usb_in || data->ta_in)
  57                         val->intval = 1;
  58                 break;
  59         case POWER_SUPPLY_PROP_HEALTH:
  60                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
  61                 if (data->fault)
  62                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
  63                 break;
  64         default:
  65                 return -EINVAL;
  66         }
  67 
  68         return 0;
  69 }
  70 
  71 static irqreturn_t max8903_dcin(int irq, void *_data)
  72 {
  73         struct max8903_data *data = _data;
  74         struct max8903_pdata *pdata = data->pdata;
  75         bool ta_in;
  76         enum power_supply_type old_type;
  77 
  78         ta_in = gpio_get_value(pdata->dok) ? false : true;
  79 
  80         if (ta_in == data->ta_in)
  81                 return IRQ_HANDLED;
  82 
  83         data->ta_in = ta_in;
  84 
  85         /* Set Current-Limit-Mode 1:DC 0:USB */
  86         if (gpio_is_valid(pdata->dcm))
  87                 gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
  88 
  89         /* Charger Enable / Disable (cen is negated) */
  90         if (gpio_is_valid(pdata->cen))
  91                 gpio_set_value(pdata->cen, ta_in ? 0 :
  92                                 (data->usb_in ? 0 : 1));
  93 
  94         dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
  95                         "Connected" : "Disconnected");
  96 
  97         old_type = data->psy_desc.type;
  98 
  99         if (data->ta_in)
 100                 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 101         else if (data->usb_in)
 102                 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 103         else
 104                 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 105 
 106         if (old_type != data->psy_desc.type)
 107                 power_supply_changed(data->psy);
 108 
 109         return IRQ_HANDLED;
 110 }
 111 
 112 static irqreturn_t max8903_usbin(int irq, void *_data)
 113 {
 114         struct max8903_data *data = _data;
 115         struct max8903_pdata *pdata = data->pdata;
 116         bool usb_in;
 117         enum power_supply_type old_type;
 118 
 119         usb_in = gpio_get_value(pdata->uok) ? false : true;
 120 
 121         if (usb_in == data->usb_in)
 122                 return IRQ_HANDLED;
 123 
 124         data->usb_in = usb_in;
 125 
 126         /* Do not touch Current-Limit-Mode */
 127 
 128         /* Charger Enable / Disable (cen is negated) */
 129         if (gpio_is_valid(pdata->cen))
 130                 gpio_set_value(pdata->cen, usb_in ? 0 :
 131                                 (data->ta_in ? 0 : 1));
 132 
 133         dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
 134                         "Connected" : "Disconnected");
 135 
 136         old_type = data->psy_desc.type;
 137 
 138         if (data->ta_in)
 139                 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 140         else if (data->usb_in)
 141                 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 142         else
 143                 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 144 
 145         if (old_type != data->psy_desc.type)
 146                 power_supply_changed(data->psy);
 147 
 148         return IRQ_HANDLED;
 149 }
 150 
 151 static irqreturn_t max8903_fault(int irq, void *_data)
 152 {
 153         struct max8903_data *data = _data;
 154         struct max8903_pdata *pdata = data->pdata;
 155         bool fault;
 156 
 157         fault = gpio_get_value(pdata->flt) ? false : true;
 158 
 159         if (fault == data->fault)
 160                 return IRQ_HANDLED;
 161 
 162         data->fault = fault;
 163 
 164         if (fault)
 165                 dev_err(data->dev, "Charger suffers a fault and stops.\n");
 166         else
 167                 dev_err(data->dev, "Charger recovered from a fault.\n");
 168 
 169         return IRQ_HANDLED;
 170 }
 171 
 172 static struct max8903_pdata *max8903_parse_dt_data(struct device *dev)
 173 {
 174         struct device_node *np = dev->of_node;
 175         struct max8903_pdata *pdata = NULL;
 176 
 177         if (!np)
 178                 return NULL;
 179 
 180         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 181         if (!pdata)
 182                 return NULL;
 183 
 184         pdata->dc_valid = false;
 185         pdata->usb_valid = false;
 186 
 187         pdata->cen = of_get_named_gpio(np, "cen-gpios", 0);
 188         if (!gpio_is_valid(pdata->cen))
 189                 pdata->cen = -EINVAL;
 190 
 191         pdata->chg = of_get_named_gpio(np, "chg-gpios", 0);
 192         if (!gpio_is_valid(pdata->chg))
 193                 pdata->chg = -EINVAL;
 194 
 195         pdata->flt = of_get_named_gpio(np, "flt-gpios", 0);
 196         if (!gpio_is_valid(pdata->flt))
 197                 pdata->flt = -EINVAL;
 198 
 199         pdata->usus = of_get_named_gpio(np, "usus-gpios", 0);
 200         if (!gpio_is_valid(pdata->usus))
 201                 pdata->usus = -EINVAL;
 202 
 203         pdata->dcm = of_get_named_gpio(np, "dcm-gpios", 0);
 204         if (!gpio_is_valid(pdata->dcm))
 205                 pdata->dcm = -EINVAL;
 206 
 207         pdata->dok = of_get_named_gpio(np, "dok-gpios", 0);
 208         if (!gpio_is_valid(pdata->dok))
 209                 pdata->dok = -EINVAL;
 210         else
 211                 pdata->dc_valid = true;
 212 
 213         pdata->uok = of_get_named_gpio(np, "uok-gpios", 0);
 214         if (!gpio_is_valid(pdata->uok))
 215                 pdata->uok = -EINVAL;
 216         else
 217                 pdata->usb_valid = true;
 218 
 219         return pdata;
 220 }
 221 
 222 static int max8903_setup_gpios(struct platform_device *pdev)
 223 {
 224         struct max8903_data *data = platform_get_drvdata(pdev);
 225         struct device *dev = &pdev->dev;
 226         struct max8903_pdata *pdata = pdev->dev.platform_data;
 227         int ret = 0;
 228         int gpio;
 229         int ta_in = 0;
 230         int usb_in = 0;
 231 
 232         if (pdata->dc_valid) {
 233                 if (gpio_is_valid(pdata->dok)) {
 234                         ret = devm_gpio_request(dev, pdata->dok,
 235                                                 data->psy_desc.name);
 236                         if (ret) {
 237                                 dev_err(dev,
 238                                         "Failed GPIO request for dok: %d err %d\n",
 239                                         pdata->dok, ret);
 240                                 return ret;
 241                         }
 242 
 243                         gpio = pdata->dok; /* PULL_UPed Interrupt */
 244                         ta_in = gpio_get_value(gpio) ? 0 : 1;
 245                 } else {
 246                         dev_err(dev, "When DC is wired, DOK should be wired as well.\n");
 247                         return -EINVAL;
 248                 }
 249         }
 250 
 251         if (gpio_is_valid(pdata->dcm)) {
 252                 ret = devm_gpio_request(dev, pdata->dcm, data->psy_desc.name);
 253                 if (ret) {
 254                         dev_err(dev,
 255                                 "Failed GPIO request for dcm: %d err %d\n",
 256                                 pdata->dcm, ret);
 257                         return ret;
 258                 }
 259 
 260                 gpio = pdata->dcm; /* Output */
 261                 gpio_set_value(gpio, ta_in);
 262         }
 263 
 264         if (pdata->usb_valid) {
 265                 if (gpio_is_valid(pdata->uok)) {
 266                         ret = devm_gpio_request(dev, pdata->uok,
 267                                                 data->psy_desc.name);
 268                         if (ret) {
 269                                 dev_err(dev,
 270                                         "Failed GPIO request for uok: %d err %d\n",
 271                                         pdata->uok, ret);
 272                                 return ret;
 273                         }
 274 
 275                         gpio = pdata->uok;
 276                         usb_in = gpio_get_value(gpio) ? 0 : 1;
 277                 } else {
 278                         dev_err(dev, "When USB is wired, UOK should be wired."
 279                                         "as well.\n");
 280                         return -EINVAL;
 281                 }
 282         }
 283 
 284         if (gpio_is_valid(pdata->cen)) {
 285                 ret = devm_gpio_request(dev, pdata->cen, data->psy_desc.name);
 286                 if (ret) {
 287                         dev_err(dev,
 288                                 "Failed GPIO request for cen: %d err %d\n",
 289                                 pdata->cen, ret);
 290                         return ret;
 291                 }
 292 
 293                 gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 294         }
 295 
 296         if (gpio_is_valid(pdata->chg)) {
 297                 ret = devm_gpio_request(dev, pdata->chg, data->psy_desc.name);
 298                 if (ret) {
 299                         dev_err(dev,
 300                                 "Failed GPIO request for chg: %d err %d\n",
 301                                 pdata->chg, ret);
 302                         return ret;
 303                 }
 304         }
 305 
 306         if (gpio_is_valid(pdata->flt)) {
 307                 ret = devm_gpio_request(dev, pdata->flt, data->psy_desc.name);
 308                 if (ret) {
 309                         dev_err(dev,
 310                                 "Failed GPIO request for flt: %d err %d\n",
 311                                 pdata->flt, ret);
 312                         return ret;
 313                 }
 314         }
 315 
 316         if (gpio_is_valid(pdata->usus)) {
 317                 ret = devm_gpio_request(dev, pdata->usus, data->psy_desc.name);
 318                 if (ret) {
 319                         dev_err(dev,
 320                                 "Failed GPIO request for usus: %d err %d\n",
 321                                 pdata->usus, ret);
 322                         return ret;
 323                 }
 324         }
 325 
 326         data->fault = false;
 327         data->ta_in = ta_in;
 328         data->usb_in = usb_in;
 329 
 330         return 0;
 331 }
 332 
 333 static int max8903_probe(struct platform_device *pdev)
 334 {
 335         struct max8903_data *data;
 336         struct device *dev = &pdev->dev;
 337         struct max8903_pdata *pdata = pdev->dev.platform_data;
 338         struct power_supply_config psy_cfg = {};
 339         int ret = 0;
 340 
 341         data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
 342         if (!data)
 343                 return -ENOMEM;
 344 
 345         if (IS_ENABLED(CONFIG_OF) && !pdata && dev->of_node)
 346                 pdata = max8903_parse_dt_data(dev);
 347 
 348         if (!pdata) {
 349                 dev_err(dev, "No platform data.\n");
 350                 return -EINVAL;
 351         }
 352 
 353         pdev->dev.platform_data = pdata;
 354         data->pdata = pdata;
 355         data->dev = dev;
 356         platform_set_drvdata(pdev, data);
 357 
 358         if (pdata->dc_valid == false && pdata->usb_valid == false) {
 359                 dev_err(dev, "No valid power sources.\n");
 360                 return -EINVAL;
 361         }
 362 
 363         ret = max8903_setup_gpios(pdev);
 364         if (ret)
 365                 return ret;
 366 
 367         data->psy_desc.name = "max8903_charger";
 368         data->psy_desc.type = (data->ta_in) ? POWER_SUPPLY_TYPE_MAINS :
 369                         ((data->usb_in) ? POWER_SUPPLY_TYPE_USB :
 370                          POWER_SUPPLY_TYPE_BATTERY);
 371         data->psy_desc.get_property = max8903_get_property;
 372         data->psy_desc.properties = max8903_charger_props;
 373         data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
 374 
 375         psy_cfg.of_node = dev->of_node;
 376         psy_cfg.drv_data = data;
 377 
 378         data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
 379         if (IS_ERR(data->psy)) {
 380                 dev_err(dev, "failed: power supply register.\n");
 381                 return PTR_ERR(data->psy);
 382         }
 383 
 384         if (pdata->dc_valid) {
 385                 ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
 386                                         NULL, max8903_dcin,
 387                                         IRQF_TRIGGER_FALLING |
 388                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 389                                         "MAX8903 DC IN", data);
 390                 if (ret) {
 391                         dev_err(dev, "Cannot request irq %d for DC (%d)\n",
 392                                         gpio_to_irq(pdata->dok), ret);
 393                         return ret;
 394                 }
 395         }
 396 
 397         if (pdata->usb_valid) {
 398                 ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
 399                                         NULL, max8903_usbin,
 400                                         IRQF_TRIGGER_FALLING |
 401                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 402                                         "MAX8903 USB IN", data);
 403                 if (ret) {
 404                         dev_err(dev, "Cannot request irq %d for USB (%d)\n",
 405                                         gpio_to_irq(pdata->uok), ret);
 406                         return ret;
 407                 }
 408         }
 409 
 410         if (gpio_is_valid(pdata->flt)) {
 411                 ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
 412                                         NULL, max8903_fault,
 413                                         IRQF_TRIGGER_FALLING |
 414                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 415                                         "MAX8903 Fault", data);
 416                 if (ret) {
 417                         dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
 418                                         gpio_to_irq(pdata->flt), ret);
 419                         return ret;
 420                 }
 421         }
 422 
 423         return 0;
 424 }
 425 
 426 static const struct of_device_id max8903_match_ids[] = {
 427         { .compatible = "maxim,max8903", },
 428         { /* sentinel */ }
 429 };
 430 MODULE_DEVICE_TABLE(of, max8903_match_ids);
 431 
 432 static struct platform_driver max8903_driver = {
 433         .probe  = max8903_probe,
 434         .driver = {
 435                 .name   = "max8903-charger",
 436                 .of_match_table = max8903_match_ids
 437         },
 438 };
 439 
 440 module_platform_driver(max8903_driver);
 441 
 442 MODULE_LICENSE("GPL");
 443 MODULE_DESCRIPTION("MAX8903 Charger Driver");
 444 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 445 MODULE_ALIAS("platform:max8903-charger");

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