drivers/power/max8903_charger.c

   1 /*
   2  * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
   3  *
   4  * Copyright (C) 2011 Samsung Electronics
   5  * MyungJoo Ham <myungjoo.ham@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 #include <linux/gpio.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/slab.h>
  26 #include <linux/power_supply.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/power/max8903_charger.h>
  29
  30 struct max8903_data {
  31         struct max8903_pdata pdata;
  32         struct device *dev;
  33         struct power_supply psy;
  34         bool fault;
  35         bool usb_in;
  36         bool ta_in;
  37 };
  38
  39 static enum power_supply_property max8903_charger_props[] = {
  40         POWER_SUPPLY_PROP_STATUS, /* Charger status output */
  41         POWER_SUPPLY_PROP_ONLINE, /* External power source */
  42         POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
  43 };
  44
  45 static int max8903_get_property(struct power_supply *psy,
  46                 enum power_supply_property psp,
  47                 union power_supply_propval *val)
  48 {
  49         struct max8903_data *data = container_of(psy,
  50                         struct max8903_data, psy);
  51
  52         switch (psp) {
  53         case POWER_SUPPLY_PROP_STATUS:
  54                 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  55                 if (data->pdata.chg) {
  56                         if (gpio_get_value(data->pdata.chg) == 0)
  57                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
  58                         else if (data->usb_in || data->ta_in)
  59                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  60                         else
  61                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  62                 }
  63                 break;
  64         case POWER_SUPPLY_PROP_ONLINE:
  65                 val->intval = 0;
  66                 if (data->usb_in || data->ta_in)
  67                         val->intval = 1;
  68                 break;
  69         case POWER_SUPPLY_PROP_HEALTH:
  70                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
  71                 if (data->fault)
  72                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
  73                 break;
  74         default:
  75                 return -EINVAL;
  76         }
  77         return 0;
  78 }
  79
  80 static irqreturn_t max8903_dcin(int irq, void *_data)
  81 {
  82         struct max8903_data *data = _data;
  83         struct max8903_pdata *pdata = &data->pdata;
  84         bool ta_in;
  85         enum power_supply_type old_type;
  86
  87         ta_in = gpio_get_value(pdata->dok) ? false : true;
  88
  89         if (ta_in == data->ta_in)
  90                 return IRQ_HANDLED;
  91
  92         data->ta_in = ta_in;
  93
  94         /* Set Current-Limit-Mode 1:DC 0:USB */
  95         if (pdata->dcm)
  96                 gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
  97
  98         /* Charger Enable / Disable (cen is negated) */
  99         if (pdata->cen)
 100                 gpio_set_value(pdata->cen, ta_in ? 0 :
 101                                 (data->usb_in ? 0 : 1));
 102
 103         dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
 104                         "Connected" : "Disconnected");
 105
 106         old_type = data->psy.type;
 107
 108         if (data->ta_in)
 109                 data->psy.type = POWER_SUPPLY_TYPE_MAINS;
 110         else if (data->usb_in)
 111                 data->psy.type = POWER_SUPPLY_TYPE_USB;
 112         else
 113                 data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
 114
 115         if (old_type != data->psy.type)
 116                 power_supply_changed(&data->psy);
 117
 118         return IRQ_HANDLED;
 119 }
 120
 121 static irqreturn_t max8903_usbin(int irq, void *_data)
 122 {
 123         struct max8903_data *data = _data;
 124         struct max8903_pdata *pdata = &data->pdata;
 125         bool usb_in;
 126         enum power_supply_type old_type;
 127
 128         usb_in = gpio_get_value(pdata->uok) ? false : true;
 129
 130         if (usb_in == data->usb_in)
 131                 return IRQ_HANDLED;
 132
 133         data->usb_in = usb_in;
 134
 135         /* Do not touch Current-Limit-Mode */
 136
 137         /* Charger Enable / Disable (cen is negated) */
 138         if (pdata->cen)
 139                 gpio_set_value(pdata->cen, usb_in ? 0 :
 140                                 (data->ta_in ? 0 : 1));
 141
 142         dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
 143                         "Connected" : "Disconnected");
 144
 145         old_type = data->psy.type;
 146
 147         if (data->ta_in)
 148                 data->psy.type = POWER_SUPPLY_TYPE_MAINS;
 149         else if (data->usb_in)
 150                 data->psy.type = POWER_SUPPLY_TYPE_USB;
 151         else
 152                 data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
 153
 154         if (old_type != data->psy.type)
 155                 power_supply_changed(&data->psy);
 156
 157         return IRQ_HANDLED;
 158 }
 159
 160 static irqreturn_t max8903_fault(int irq, void *_data)
 161 {
 162         struct max8903_data *data = _data;
 163         struct max8903_pdata *pdata = &data->pdata;
 164         bool fault;
 165
 166         fault = gpio_get_value(pdata->flt) ? false : true;
 167
 168         if (fault == data->fault)
 169                 return IRQ_HANDLED;
 170
 171         data->fault = fault;
 172
 173         if (fault)
 174                 dev_err(data->dev, "Charger suffers a fault and stops.\n");
 175         else
 176                 dev_err(data->dev, "Charger recovered from a fault.\n");
 177
 178         return IRQ_HANDLED;
 179 }
 180
 181 static __devinit int max8903_probe(struct platform_device *pdev)
 182 {
 183         struct max8903_data *data;
 184         struct device *dev = &pdev->dev;
 185         struct max8903_pdata *pdata = pdev->dev.platform_data;
 186         int ret = 0;
 187         int gpio;
 188         int ta_in = 0;
 189         int usb_in = 0;
 190
 191         data = kzalloc(sizeof(struct max8903_data), GFP_KERNEL);
 192         if (data == NULL) {
 193                 dev_err(dev, "Cannot allocate memory.\n");
 194                 return -ENOMEM;
 195         }
 196         memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
 197         data->dev = dev;
 198         platform_set_drvdata(pdev, data);
 199
 200         if (pdata->dc_valid == false && pdata->usb_valid == false) {
 201                 dev_err(dev, "No valid power sources.\n");
 202                 ret = -EINVAL;
 203                 goto err;
 204         }
 205
 206         if (pdata->dc_valid) {
 207                 if (pdata->dok && gpio_is_valid(pdata->dok) &&
 208                                 pdata->dcm && gpio_is_valid(pdata->dcm)) {
 209                         gpio = pdata->dok; /* PULL_UPed Interrupt */
 210                         ta_in = gpio_get_value(gpio) ? 0 : 1;
 211
 212                         gpio = pdata->dcm; /* Output */
 213                         gpio_set_value(gpio, ta_in);
 214                 } else {
 215                         dev_err(dev, "When DC is wired, DOK and DCM should"
 216                                         " be wired as well.\n");
 217                         ret = -EINVAL;
 218                         goto err;
 219                 }
 220         } else {
 221                 if (pdata->dcm) {
 222                         if (gpio_is_valid(pdata->dcm))
 223                                 gpio_set_value(pdata->dcm, 0);
 224                         else {
 225                                 dev_err(dev, "Invalid pin: dcm.\n");
 226                                 ret = -EINVAL;
 227                                 goto err;
 228                         }
 229                 }
 230         }
 231
 232         if (pdata->usb_valid) {
 233                 if (pdata->uok && gpio_is_valid(pdata->uok)) {
 234                         gpio = pdata->uok;
 235                         usb_in = gpio_get_value(gpio) ? 0 : 1;
 236                 } else {
 237                         dev_err(dev, "When USB is wired, UOK should be wired."
 238                                         "as well.\n");
 239                         ret = -EINVAL;
 240                         goto err;
 241                 }
 242         }
 243
 244         if (pdata->cen) {
 245                 if (gpio_is_valid(pdata->cen)) {
 246                         gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 247                 } else {
 248                         dev_err(dev, "Invalid pin: cen.\n");
 249                         ret = -EINVAL;
 250                         goto err;
 251                 }
 252         }
 253
 254         if (pdata->chg) {
 255                 if (!gpio_is_valid(pdata->chg)) {
 256                         dev_err(dev, "Invalid pin: chg.\n");
 257                         ret = -EINVAL;
 258                         goto err;
 259                 }
 260         }
 261
 262         if (pdata->flt) {
 263                 if (!gpio_is_valid(pdata->flt)) {
 264                         dev_err(dev, "Invalid pin: flt.\n");
 265                         ret = -EINVAL;
 266                         goto err;
 267                 }
 268         }
 269
 270         if (pdata->usus) {
 271                 if (!gpio_is_valid(pdata->usus)) {
 272                         dev_err(dev, "Invalid pin: usus.\n");
 273                         ret = -EINVAL;
 274                         goto err;
 275                 }
 276         }
 277
 278         data->fault = false;
 279         data->ta_in = ta_in;
 280         data->usb_in = usb_in;
 281
 282         data->psy.name = "max8903_charger";
 283         data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
 284                         ((usb_in) ? POWER_SUPPLY_TYPE_USB :
 285                          POWER_SUPPLY_TYPE_BATTERY);
 286         data->psy.get_property = max8903_get_property;
 287         data->psy.properties = max8903_charger_props;
 288         data->psy.num_properties = ARRAY_SIZE(max8903_charger_props);
 289
 290         ret = power_supply_register(dev, &data->psy);
 291         if (ret) {
 292                 dev_err(dev, "failed: power supply register.\n");
 293                 goto err;
 294         }
 295
 296         if (pdata->dc_valid) {
 297                 ret = request_threaded_irq(gpio_to_irq(pdata->dok),
 298                                 NULL, max8903_dcin,
 299                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 300                                 "MAX8903 DC IN", data);
 301                 if (ret) {
 302                         dev_err(dev, "Cannot request irq %d for DC (%d)\n",
 303                                         gpio_to_irq(pdata->dok), ret);
 304                         goto err_psy;
 305                 }
 306         }
 307
 308         if (pdata->usb_valid) {
 309                 ret = request_threaded_irq(gpio_to_irq(pdata->uok),
 310                                 NULL, max8903_usbin,
 311                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 312                                 "MAX8903 USB IN", data);
 313                 if (ret) {
 314                         dev_err(dev, "Cannot request irq %d for USB (%d)\n",
 315                                         gpio_to_irq(pdata->uok), ret);
 316                         goto err_dc_irq;
 317                 }
 318         }
 319
 320         if (pdata->flt) {
 321                 ret = request_threaded_irq(gpio_to_irq(pdata->flt),
 322                                 NULL, max8903_fault,
 323                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 324                                 "MAX8903 Fault", data);
 325                 if (ret) {
 326                         dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
 327                                         gpio_to_irq(pdata->flt), ret);
 328                         goto err_usb_irq;
 329                 }
 330         }
 331
 332         return 0;
 333
 334 err_usb_irq:
 335         if (pdata->usb_valid)
 336                 free_irq(gpio_to_irq(pdata->uok), data);
 337 err_dc_irq:
 338         if (pdata->dc_valid)
 339                 free_irq(gpio_to_irq(pdata->dok), data);
 340 err_psy:
 341         power_supply_unregister(&data->psy);
 342 err:
 343         kfree(data);
 344         return ret;
 345 }
 346
 347 static __devexit int max8903_remove(struct platform_device *pdev)
 348 {
 349         struct max8903_data *data = platform_get_drvdata(pdev);
 350
 351         if (data) {
 352                 struct max8903_pdata *pdata = &data->pdata;
 353
 354                 if (pdata->flt)
 355                         free_irq(gpio_to_irq(pdata->flt), data);
 356                 if (pdata->usb_valid)
 357                         free_irq(gpio_to_irq(pdata->uok), data);
 358                 if (pdata->dc_valid)
 359                         free_irq(gpio_to_irq(pdata->dok), data);
 360                 power_supply_unregister(&data->psy);
 361                 kfree(data);
 362         }
 363
 364         return 0;
 365 }
 366
 367 static struct platform_driver max8903_driver = {
 368         .probe  = max8903_probe,
 369         .remove = __devexit_p(max8903_remove),
 370         .driver = {
 371                 .name   = "max8903-charger",
 372                 .owner  = THIS_MODULE,
 373         },
 374 };
 375
 376 static int __init max8903_init(void)
 377 {
 378         return platform_driver_register(&max8903_driver);
 379 }
 380 module_init(max8903_init);
 381
 382 static void __exit max8903_exit(void)
 383 {
 384         platform_driver_unregister(&max8903_driver);
 385 }
 386 module_exit(max8903_exit);
 387
 388 MODULE_LICENSE("GPL");
 389 MODULE_DESCRIPTION("MAX8903 Charger Driver");
 390 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 391 MODULE_ALIAS("max8903-charger");