linux/drivers/power/max8903_charger.c
<<
>>
Prefs
   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/module.h>
  26#include <linux/slab.h>
  27#include <linux/power_supply.h>
  28#include <linux/platform_device.h>
  29#include <linux/power/max8903_charger.h>
  30
  31struct max8903_data {
  32        struct max8903_pdata pdata;
  33        struct device *dev;
  34        struct power_supply psy;
  35        bool fault;
  36        bool usb_in;
  37        bool ta_in;
  38};
  39
  40static enum power_supply_property max8903_charger_props[] = {
  41        POWER_SUPPLY_PROP_STATUS, /* Charger status output */
  42        POWER_SUPPLY_PROP_ONLINE, /* External power source */
  43        POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
  44};
  45
  46static int max8903_get_property(struct power_supply *psy,
  47                enum power_supply_property psp,
  48                union power_supply_propval *val)
  49{
  50        struct max8903_data *data = container_of(psy,
  51                        struct max8903_data, psy);
  52
  53        switch (psp) {
  54        case POWER_SUPPLY_PROP_STATUS:
  55                val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  56                if (data->pdata.chg) {
  57                        if (gpio_get_value(data->pdata.chg) == 0)
  58                                val->intval = POWER_SUPPLY_STATUS_CHARGING;
  59                        else if (data->usb_in || data->ta_in)
  60                                val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  61                        else
  62                                val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
  63                }
  64                break;
  65        case POWER_SUPPLY_PROP_ONLINE:
  66                val->intval = 0;
  67                if (data->usb_in || data->ta_in)
  68                        val->intval = 1;
  69                break;
  70        case POWER_SUPPLY_PROP_HEALTH:
  71                val->intval = POWER_SUPPLY_HEALTH_GOOD;
  72                if (data->fault)
  73                        val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
  74                break;
  75        default:
  76                return -EINVAL;
  77        }
  78        return 0;
  79}
  80
  81static irqreturn_t max8903_dcin(int irq, void *_data)
  82{
  83        struct max8903_data *data = _data;
  84        struct max8903_pdata *pdata = &data->pdata;
  85        bool ta_in;
  86        enum power_supply_type old_type;
  87
  88        ta_in = gpio_get_value(pdata->dok) ? false : true;
  89
  90        if (ta_in == data->ta_in)
  91                return IRQ_HANDLED;
  92
  93        data->ta_in = ta_in;
  94
  95        /* Set Current-Limit-Mode 1:DC 0:USB */
  96        if (pdata->dcm)
  97                gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
  98
  99        /* Charger Enable / Disable (cen is negated) */
 100        if (pdata->cen)
 101                gpio_set_value(pdata->cen, ta_in ? 0 :
 102                                (data->usb_in ? 0 : 1));
 103
 104        dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
 105                        "Connected" : "Disconnected");
 106
 107        old_type = data->psy.type;
 108
 109        if (data->ta_in)
 110                data->psy.type = POWER_SUPPLY_TYPE_MAINS;
 111        else if (data->usb_in)
 112                data->psy.type = POWER_SUPPLY_TYPE_USB;
 113        else
 114                data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
 115
 116        if (old_type != data->psy.type)
 117                power_supply_changed(&data->psy);
 118
 119        return IRQ_HANDLED;
 120}
 121
 122static irqreturn_t max8903_usbin(int irq, void *_data)
 123{
 124        struct max8903_data *data = _data;
 125        struct max8903_pdata *pdata = &data->pdata;
 126        bool usb_in;
 127        enum power_supply_type old_type;
 128
 129        usb_in = gpio_get_value(pdata->uok) ? false : true;
 130
 131        if (usb_in == data->usb_in)
 132                return IRQ_HANDLED;
 133
 134        data->usb_in = usb_in;
 135
 136        /* Do not touch Current-Limit-Mode */
 137
 138        /* Charger Enable / Disable (cen is negated) */
 139        if (pdata->cen)
 140                gpio_set_value(pdata->cen, usb_in ? 0 :
 141                                (data->ta_in ? 0 : 1));
 142
 143        dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
 144                        "Connected" : "Disconnected");
 145
 146        old_type = data->psy.type;
 147
 148        if (data->ta_in)
 149                data->psy.type = POWER_SUPPLY_TYPE_MAINS;
 150        else if (data->usb_in)
 151                data->psy.type = POWER_SUPPLY_TYPE_USB;
 152        else
 153                data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
 154
 155        if (old_type != data->psy.type)
 156                power_supply_changed(&data->psy);
 157
 158        return IRQ_HANDLED;
 159}
 160
 161static irqreturn_t max8903_fault(int irq, void *_data)
 162{
 163        struct max8903_data *data = _data;
 164        struct max8903_pdata *pdata = &data->pdata;
 165        bool fault;
 166
 167        fault = gpio_get_value(pdata->flt) ? false : true;
 168
 169        if (fault == data->fault)
 170                return IRQ_HANDLED;
 171
 172        data->fault = fault;
 173
 174        if (fault)
 175                dev_err(data->dev, "Charger suffers a fault and stops.\n");
 176        else
 177                dev_err(data->dev, "Charger recovered from a fault.\n");
 178
 179        return IRQ_HANDLED;
 180}
 181
 182static int max8903_probe(struct platform_device *pdev)
 183{
 184        struct max8903_data *data;
 185        struct device *dev = &pdev->dev;
 186        struct max8903_pdata *pdata = pdev->dev.platform_data;
 187        int ret = 0;
 188        int gpio;
 189        int ta_in = 0;
 190        int usb_in = 0;
 191
 192        data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
 193        if (data == NULL) {
 194                dev_err(dev, "Cannot allocate memory.\n");
 195                return -ENOMEM;
 196        }
 197        memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
 198        data->dev = dev;
 199        platform_set_drvdata(pdev, data);
 200
 201        if (pdata->dc_valid == false && pdata->usb_valid == false) {
 202                dev_err(dev, "No valid power sources.\n");
 203                ret = -EINVAL;
 204                goto err;
 205        }
 206
 207        if (pdata->dc_valid) {
 208                if (pdata->dok && gpio_is_valid(pdata->dok) &&
 209                                pdata->dcm && gpio_is_valid(pdata->dcm)) {
 210                        gpio = pdata->dok; /* PULL_UPed Interrupt */
 211                        ta_in = gpio_get_value(gpio) ? 0 : 1;
 212
 213                        gpio = pdata->dcm; /* Output */
 214                        gpio_set_value(gpio, ta_in);
 215                } else {
 216                        dev_err(dev, "When DC is wired, DOK and DCM should"
 217                                        " be wired as well.\n");
 218                        ret = -EINVAL;
 219                        goto err;
 220                }
 221        } else {
 222                if (pdata->dcm) {
 223                        if (gpio_is_valid(pdata->dcm))
 224                                gpio_set_value(pdata->dcm, 0);
 225                        else {
 226                                dev_err(dev, "Invalid pin: dcm.\n");
 227                                ret = -EINVAL;
 228                                goto err;
 229                        }
 230                }
 231        }
 232
 233        if (pdata->usb_valid) {
 234                if (pdata->uok && gpio_is_valid(pdata->uok)) {
 235                        gpio = pdata->uok;
 236                        usb_in = gpio_get_value(gpio) ? 0 : 1;
 237                } else {
 238                        dev_err(dev, "When USB is wired, UOK should be wired."
 239                                        "as well.\n");
 240                        ret = -EINVAL;
 241                        goto err;
 242                }
 243        }
 244
 245        if (pdata->cen) {
 246                if (gpio_is_valid(pdata->cen)) {
 247                        gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 248                } else {
 249                        dev_err(dev, "Invalid pin: cen.\n");
 250                        ret = -EINVAL;
 251                        goto err;
 252                }
 253        }
 254
 255        if (pdata->chg) {
 256                if (!gpio_is_valid(pdata->chg)) {
 257                        dev_err(dev, "Invalid pin: chg.\n");
 258                        ret = -EINVAL;
 259                        goto err;
 260                }
 261        }
 262
 263        if (pdata->flt) {
 264                if (!gpio_is_valid(pdata->flt)) {
 265                        dev_err(dev, "Invalid pin: flt.\n");
 266                        ret = -EINVAL;
 267                        goto err;
 268                }
 269        }
 270
 271        if (pdata->usus) {
 272                if (!gpio_is_valid(pdata->usus)) {
 273                        dev_err(dev, "Invalid pin: usus.\n");
 274                        ret = -EINVAL;
 275                        goto err;
 276                }
 277        }
 278
 279        data->fault = false;
 280        data->ta_in = ta_in;
 281        data->usb_in = usb_in;
 282
 283        data->psy.name = "max8903_charger";
 284        data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
 285                        ((usb_in) ? POWER_SUPPLY_TYPE_USB :
 286                         POWER_SUPPLY_TYPE_BATTERY);
 287        data->psy.get_property = max8903_get_property;
 288        data->psy.properties = max8903_charger_props;
 289        data->psy.num_properties = ARRAY_SIZE(max8903_charger_props);
 290
 291        ret = power_supply_register(dev, &data->psy);
 292        if (ret) {
 293                dev_err(dev, "failed: power supply register.\n");
 294                goto err;
 295        }
 296
 297        if (pdata->dc_valid) {
 298                ret = request_threaded_irq(gpio_to_irq(pdata->dok),
 299                                NULL, max8903_dcin,
 300                                IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 301                                "MAX8903 DC IN", data);
 302                if (ret) {
 303                        dev_err(dev, "Cannot request irq %d for DC (%d)\n",
 304                                        gpio_to_irq(pdata->dok), ret);
 305                        goto err_psy;
 306                }
 307        }
 308
 309        if (pdata->usb_valid) {
 310                ret = request_threaded_irq(gpio_to_irq(pdata->uok),
 311                                NULL, max8903_usbin,
 312                                IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 313                                "MAX8903 USB IN", data);
 314                if (ret) {
 315                        dev_err(dev, "Cannot request irq %d for USB (%d)\n",
 316                                        gpio_to_irq(pdata->uok), ret);
 317                        goto err_dc_irq;
 318                }
 319        }
 320
 321        if (pdata->flt) {
 322                ret = request_threaded_irq(gpio_to_irq(pdata->flt),
 323                                NULL, max8903_fault,
 324                                IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
 325                                "MAX8903 Fault", data);
 326                if (ret) {
 327                        dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
 328                                        gpio_to_irq(pdata->flt), ret);
 329                        goto err_usb_irq;
 330                }
 331        }
 332
 333        return 0;
 334
 335err_usb_irq:
 336        if (pdata->usb_valid)
 337                free_irq(gpio_to_irq(pdata->uok), data);
 338err_dc_irq:
 339        if (pdata->dc_valid)
 340                free_irq(gpio_to_irq(pdata->dok), data);
 341err_psy:
 342        power_supply_unregister(&data->psy);
 343err:
 344        return ret;
 345}
 346
 347static 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        }
 362
 363        return 0;
 364}
 365
 366static struct platform_driver max8903_driver = {
 367        .probe  = max8903_probe,
 368        .remove = max8903_remove,
 369        .driver = {
 370                .name   = "max8903-charger",
 371                .owner  = THIS_MODULE,
 372        },
 373};
 374
 375module_platform_driver(max8903_driver);
 376
 377MODULE_LICENSE("GPL");
 378MODULE_DESCRIPTION("MAX8903 Charger Driver");
 379MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 380MODULE_ALIAS("platform:max8903-charger");
 381
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.