drivers/power/max8997_charger.c

   1 /*
   2  * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
   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 #include <linux/module.h>
  23 #include <linux/err.h>
  24 #include <linux/module.h>
  25 #include <linux/slab.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/power_supply.h>
  28 #include <linux/mfd/max8997.h>
  29 #include <linux/mfd/max8997-private.h>
  30
  31 struct charger_data {
  32         struct device *dev;
  33         struct max8997_dev *iodev;
  34         struct power_supply battery;
  35 };
  36
  37 static enum power_supply_property max8997_battery_props[] = {
  38         POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
  39         POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
  40         POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
  41 };
  42
  43 /* Note that the charger control is done by a current regulator "CHARGER" */
  44 static int max8997_battery_get_property(struct power_supply *psy,
  45                 enum power_supply_property psp,
  46                 union power_supply_propval *val)
  47 {
  48         struct charger_data *charger = container_of(psy,
  49                         struct charger_data, battery);
  50         struct i2c_client *i2c = charger->iodev->i2c;
  51         int ret;
  52         u8 reg;
  53
  54         switch (psp) {
  55         case POWER_SUPPLY_PROP_STATUS:
  56                 val->intval = 0;
  57                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  58                 if (ret)
  59                         return ret;
  60                 if ((reg & (1 << 0)) == 0x1)
  61                         val->intval = POWER_SUPPLY_STATUS_FULL;
  62
  63                 break;
  64         case POWER_SUPPLY_PROP_PRESENT:
  65                 val->intval = 0;
  66                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  67                 if (ret)
  68                         return ret;
  69                 if ((reg & (1 << 2)) == 0x0)
  70                         val->intval = 1;
  71
  72                 break;
  73         case POWER_SUPPLY_PROP_ONLINE:
  74                 val->intval = 0;
  75                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  76                 if (ret)
  77                         return ret;
  78                 /* DCINOK */
  79                 if (reg & (1 << 1))
  80                         val->intval = 1;
  81
  82                 break;
  83         default:
  84                 return -EINVAL;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static __devinit int max8997_battery_probe(struct platform_device *pdev)
  91 {
  92         int ret = 0;
  93         struct charger_data *charger;
  94         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  95         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
  96
  97         if (!pdata)
  98                 return -EINVAL;
  99
 100         if (pdata->eoc_mA) {
 101                 u8 val = (pdata->eoc_mA - 50) / 10;
 102                 if (val < 0)
 103                         val = 0;
 104                 if (val > 0xf)
 105                         val = 0xf;
 106
 107                 ret = max8997_update_reg(iodev->i2c,
 108                                 MAX8997_REG_MBCCTRL5, val, 0xf);
 109                 if (ret < 0) {
 110                         dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 111                         return ret;
 112                 }
 113         }
 114
 115         switch (pdata->timeout) {
 116         case 5:
 117                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 118                                 0x2 << 4, 0x7 << 4);
 119                 break;
 120         case 6:
 121                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 122                                 0x3 << 4, 0x7 << 4);
 123                 break;
 124         case 7:
 125                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 126                                 0x4 << 4, 0x7 << 4);
 127                 break;
 128         case 0:
 129                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 130                                 0x7 << 4, 0x7 << 4);
 131                 break;
 132         default:
 133                 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
 134                                 pdata->timeout);
 135                 return -EINVAL;
 136         }
 137         if (ret < 0) {
 138                 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 139                 return ret;
 140         }
 141
 142         charger = kzalloc(sizeof(struct charger_data), GFP_KERNEL);
 143         if (charger == NULL) {
 144                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
 145                 return -ENOMEM;
 146         }
 147
 148         platform_set_drvdata(pdev, charger);
 149
 150         charger->battery.name = "max8997_pmic";
 151         charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 152         charger->battery.get_property = max8997_battery_get_property;
 153         charger->battery.properties = max8997_battery_props;
 154         charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
 155
 156         charger->dev = &pdev->dev;
 157         charger->iodev = iodev;
 158
 159         ret = power_supply_register(&pdev->dev, &charger->battery);
 160         if (ret) {
 161                 dev_err(&pdev->dev, "failed: power supply register\n");
 162                 goto err;
 163         }
 164
 165         return 0;
 166 err:
 167         kfree(charger);
 168         return ret;
 169 }
 170
 171 static int __devexit max8997_battery_remove(struct platform_device *pdev)
 172 {
 173         struct charger_data *charger = platform_get_drvdata(pdev);
 174
 175         power_supply_unregister(&charger->battery);
 176         kfree(charger);
 177         return 0;
 178 }
 179
 180 static const struct platform_device_id max8997_battery_id[] = {
 181         { "max8997-battery", 0 },
 182 };
 183
 184 static struct platform_driver max8997_battery_driver = {
 185         .driver = {
 186                 .name = "max8997-battery",
 187                 .owner = THIS_MODULE,
 188         },
 189         .probe = max8997_battery_probe,
 190         .remove = __devexit_p(max8997_battery_remove),
 191         .id_table = max8997_battery_id,
 192 };
 193
 194 static int __init max8997_battery_init(void)
 195 {
 196         return platform_driver_register(&max8997_battery_driver);
 197 }
 198 subsys_initcall(max8997_battery_init);
 199
 200 static void __exit max8997_battery_cleanup(void)
 201 {
 202         platform_driver_unregister(&max8997_battery_driver);
 203 }
 204 module_exit(max8997_battery_cleanup);
 205
 206 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
 207 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 208 MODULE_LICENSE("GPL");