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/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
  31 struct max8903_data {
  32         struct max8903_pdata pdata;
  33         struct device *dev;
  34         struct power_supply *psy;
  35         struct power_supply_desc psy_desc;
  36         bool fault;
  37         bool usb_in;
  38         bool ta_in;
  39 };
  40
  41 static enum power_supply_property max8903_charger_props[] = {
  42         POWER_SUPPLY_PROP_STATUS, /* Charger status output */
  43         POWER_SUPPLY_PROP_ONLINE, /* External power source */
  44         POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
  45 };
  46
  47 static int max8903_get_property(struct power_supply *psy,
  48                 enum power_supply_property psp,
  49                 union power_supply_propval *val)
  50 {
  51         struct max8903_data *data = power_supply_get_drvdata(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
  81 static 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_desc.type;
 108
 109         if (data->ta_in)
 110                 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 111         else if (data->usb_in)
 112                 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 113         else
 114                 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 115
 116         if (old_type != data->psy_desc.type)
 117                 power_supply_changed(data->psy);
 118
 119         return IRQ_HANDLED;
 120 }
 121
 122 static 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_desc.type;
 147
 148         if (data->ta_in)
 149                 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 150         else if (data->usb_in)
 151                 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 152         else
 153                 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 154
 155         if (old_type != data->psy_desc.type)
 156                 power_supply_changed(data->psy);
 157
 158         return IRQ_HANDLED;
 159 }
 160
 161 static 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
 182 static 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         struct power_supply_config psy_cfg = {};
 188         int ret = 0;
 189         int gpio;
 190         int ta_in = 0;
 191         int usb_in = 0;
 192
 193         data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
 194         if (data == NULL) {
 195                 dev_err(dev, "Cannot allocate memory.\n");
 196                 return -ENOMEM;
 197         }
 198         memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
 199         data->dev = dev;
 200         platform_set_drvdata(pdev, data);
 201
 202         if (pdata->dc_valid == false && pdata->usb_valid == false) {
 203                 dev_err(dev, "No valid power sources.\n");
 204                 return -EINVAL;
 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                         return -EINVAL;
 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                                 return -EINVAL;
 227                         }
 228                 }
 229         }
 230
 231         if (pdata->usb_valid) {
 232                 if (pdata->uok && gpio_is_valid(pdata->uok)) {
 233                         gpio = pdata->uok;
 234                         usb_in = gpio_get_value(gpio) ? 0 : 1;
 235                 } else {
 236                         dev_err(dev, "When USB is wired, UOK should be wired."
 237                                         "as well.\n");
 238                         return -EINVAL;
 239                 }
 240         }
 241
 242         if (pdata->cen) {
 243                 if (gpio_is_valid(pdata->cen)) {
 244                         gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
 245                 } else {
 246                         dev_err(dev, "Invalid pin: cen.\n");
 247                         return -EINVAL;
 248                 }
 249         }
 250
 251         if (pdata->chg) {
 252                 if (!gpio_is_valid(pdata->chg)) {
 253                         dev_err(dev, "Invalid pin: chg.\n");
 254                         return -EINVAL;
 255                 }
 256         }
 257
 258         if (pdata->flt) {
 259                 if (!gpio_is_valid(pdata->flt)) {
 260                         dev_err(dev, "Invalid pin: flt.\n");
 261                         return -EINVAL;
 262                 }
 263         }
 264
 265         if (pdata->usus) {
 266                 if (!gpio_is_valid(pdata->usus)) {
 267                         dev_err(dev, "Invalid pin: usus.\n");
 268                         return -EINVAL;
 269                 }
 270         }
 271
 272         data->fault = false;
 273         data->ta_in = ta_in;
 274         data->usb_in = usb_in;
 275
 276         data->psy_desc.name = "max8903_charger";
 277         data->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
 278                         ((usb_in) ? POWER_SUPPLY_TYPE_USB :
 279                          POWER_SUPPLY_TYPE_BATTERY);
 280         data->psy_desc.get_property = max8903_get_property;
 281         data->psy_desc.properties = max8903_charger_props;
 282         data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
 283
 284         psy_cfg.drv_data = data;
 285
 286         data->psy = devm_power_supply_register(dev, &data->psy_desc, &psy_cfg);
 287         if (IS_ERR(data->psy)) {
 288                 dev_err(dev, "failed: power supply register.\n");
 289                 return PTR_ERR(data->psy);
 290         }
 291
 292         if (pdata->dc_valid) {
 293                 ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->dok),
 294                                         NULL, max8903_dcin,
 295                                         IRQF_TRIGGER_FALLING |
 296                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 297                                         "MAX8903 DC IN", data);
 298                 if (ret) {
 299                         dev_err(dev, "Cannot request irq %d for DC (%d)\n",
 300                                         gpio_to_irq(pdata->dok), ret);
 301                         return ret;
 302                 }
 303         }
 304
 305         if (pdata->usb_valid) {
 306                 ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->uok),
 307                                         NULL, max8903_usbin,
 308                                         IRQF_TRIGGER_FALLING |
 309                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 310                                         "MAX8903 USB IN", data);
 311                 if (ret) {
 312                         dev_err(dev, "Cannot request irq %d for USB (%d)\n",
 313                                         gpio_to_irq(pdata->uok), ret);
 314                         return ret;
 315                 }
 316         }
 317
 318         if (pdata->flt) {
 319                 ret = devm_request_threaded_irq(dev, gpio_to_irq(pdata->flt),
 320                                         NULL, max8903_fault,
 321                                         IRQF_TRIGGER_FALLING |
 322                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
 323                                         "MAX8903 Fault", data);
 324                 if (ret) {
 325                         dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
 326                                         gpio_to_irq(pdata->flt), ret);
 327                         return ret;
 328                 }
 329         }
 330
 331         return 0;
 332 }
 333
 334 static struct platform_driver max8903_driver = {
 335         .probe  = max8903_probe,
 336         .driver = {
 337                 .name   = "max8903-charger",
 338         },
 339 };
 340
 341 module_platform_driver(max8903_driver);
 342
 343 MODULE_LICENSE("GPL");
 344 MODULE_DESCRIPTION("MAX8903 Charger Driver");
 345 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 346 MODULE_ALIAS("platform:max8903-charger");