drivers/power/max8998_charger.c

   1 /*
   2  * max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974
   3  *
   4  *  Copyright (C) 2009-2010 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/max8998.h>
  29 #include <linux/mfd/max8998-private.h>
  30
  31 struct max8998_battery_data {
  32         struct device *dev;
  33         struct max8998_dev *iodev;
  34         struct power_supply battery;
  35 };
  36
  37 static enum power_supply_property max8998_battery_props[] = {
  38         POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
  39         POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
  40 };
  41
  42 /* Note that the charger control is done by a current regulator "CHARGER" */
  43 static int max8998_battery_get_property(struct power_supply *psy,
  44                 enum power_supply_property psp,
  45                 union power_supply_propval *val)
  46 {
  47         struct max8998_battery_data *max8998 = container_of(psy,
  48                         struct max8998_battery_data, battery);
  49         struct i2c_client *i2c = max8998->iodev->i2c;
  50         int ret;
  51         u8 reg;
  52
  53         switch (psp) {
  54         case POWER_SUPPLY_PROP_PRESENT:
  55                 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  56                 if (ret)
  57                         return ret;
  58                 if (reg & (1 << 4))
  59                         val->intval = 0;
  60                 else
  61                         val->intval = 1;
  62                 break;
  63         case POWER_SUPPLY_PROP_ONLINE:
  64                 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  65                 if (ret)
  66                         return ret;
  67                 if (reg & (1 << 3))
  68                         val->intval = 0;
  69                 else
  70                         val->intval = 1;
  71                 break;
  72         default:
  73                 return -EINVAL;
  74         }
  75
  76         return 0;
  77 }
  78
  79 static __devinit int max8998_battery_probe(struct platform_device *pdev)
  80 {
  81         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  82         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
  83         struct max8998_battery_data *max8998;
  84         struct i2c_client *i2c;
  85         int ret = 0;
  86
  87         if (!pdata) {
  88                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
  89                 return -ENODEV;
  90         }
  91
  92         max8998 = kzalloc(sizeof(struct max8998_battery_data), GFP_KERNEL);
  93         if (!max8998)
  94                 return -ENOMEM;
  95
  96         max8998->dev = &pdev->dev;
  97         max8998->iodev = iodev;
  98         platform_set_drvdata(pdev, max8998);
  99         i2c = max8998->iodev->i2c;
 100
 101         /* Setup "End of Charge" */
 102         /* If EOC value equals 0,
 103          * remain value set from bootloader or default value */
 104         if (pdata->eoc >= 10 && pdata->eoc <= 45) {
 105                 max8998_update_reg(i2c, MAX8998_REG_CHGR1,
 106                                 (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
 107         } else if (pdata->eoc == 0) {
 108                 dev_dbg(max8998->dev,
 109                         "EOC value not set: leave it unchanged.\n");
 110         } else {
 111                 dev_err(max8998->dev, "Invalid EOC value\n");
 112                 ret = -EINVAL;
 113                 goto err;
 114         }
 115
 116         /* Setup Charge Restart Level */
 117         switch (pdata->restart) {
 118         case 100:
 119                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
 120                 break;
 121         case 150:
 122                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
 123                 break;
 124         case 200:
 125                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
 126                 break;
 127         case -1:
 128                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
 129                 break;
 130         case 0:
 131                 dev_dbg(max8998->dev,
 132                         "Restart Level not set: leave it unchanged.\n");
 133                 break;
 134         default:
 135                 dev_err(max8998->dev, "Invalid Restart Level\n");
 136                 ret = -EINVAL;
 137                 goto err;
 138         }
 139
 140         /* Setup Charge Full Timeout */
 141         switch (pdata->timeout) {
 142         case 5:
 143                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
 144                 break;
 145         case 6:
 146                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
 147                 break;
 148         case 7:
 149                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
 150                 break;
 151         case -1:
 152                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
 153                 break;
 154         case 0:
 155                 dev_dbg(max8998->dev,
 156                         "Full Timeout not set: leave it unchanged.\n");
 157                 break;
 158         default:
 159                 dev_err(max8998->dev, "Invalid Full Timeout value\n");
 160                 ret = -EINVAL;
 161                 goto err;
 162         }
 163
 164         max8998->battery.name = "max8998_pmic";
 165         max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 166         max8998->battery.get_property = max8998_battery_get_property;
 167         max8998->battery.properties = max8998_battery_props;
 168         max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props);
 169
 170         ret = power_supply_register(max8998->dev, &max8998->battery);
 171         if (ret) {
 172                 dev_err(max8998->dev, "failed: power supply register\n");
 173                 goto err;
 174         }
 175
 176         return 0;
 177 err:
 178         kfree(max8998);
 179         return ret;
 180 }
 181
 182 static int __devexit max8998_battery_remove(struct platform_device *pdev)
 183 {
 184         struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
 185
 186         power_supply_unregister(&max8998->battery);
 187         kfree(max8998);
 188
 189         return 0;
 190 }
 191
 192 static const struct platform_device_id max8998_battery_id[] = {
 193         { "max8998-battery", TYPE_MAX8998 },
 194         { }
 195 };
 196
 197 static struct platform_driver max8998_battery_driver = {
 198         .driver = {
 199                 .name = "max8998-battery",
 200                 .owner = THIS_MODULE,
 201         },
 202         .probe = max8998_battery_probe,
 203         .remove = __devexit_p(max8998_battery_remove),
 204         .id_table = max8998_battery_id,
 205 };
 206
 207 module_platform_driver(max8998_battery_driver);
 208
 209 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
 210 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 211 MODULE_LICENSE("GPL");
 212 MODULE_ALIAS("platform:max8998-battery");