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/err.h>
  23 #include <linux/slab.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/power_supply.h>
  26 #include <linux/mfd/max8998.h>
  27 #include <linux/mfd/max8998-private.h>
  28
  29 struct max8998_battery_data {
  30         struct device *dev;
  31         struct max8998_dev *iodev;
  32         struct power_supply battery;
  33 };
  34
  35 static enum power_supply_property max8998_battery_props[] = {
  36         POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
  37         POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
  38 };
  39
  40 /* Note that the charger control is done by a current regulator "CHARGER" */
  41 static int max8998_battery_get_property(struct power_supply *psy,
  42                 enum power_supply_property psp,
  43                 union power_supply_propval *val)
  44 {
  45         struct max8998_battery_data *max8998 = container_of(psy,
  46                         struct max8998_battery_data, battery);
  47         struct i2c_client *i2c = max8998->iodev->i2c;
  48         int ret;
  49         u8 reg;
  50
  51         switch (psp) {
  52         case POWER_SUPPLY_PROP_PRESENT:
  53                 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  54                 if (ret)
  55                         return ret;
  56                 if (reg & (1 << 4))
  57                         val->intval = 0;
  58                 else
  59                         val->intval = 1;
  60                 break;
  61         case POWER_SUPPLY_PROP_ONLINE:
  62                 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  63                 if (ret)
  64                         return ret;
  65                 if (reg & (1 << 3))
  66                         val->intval = 0;
  67                 else
  68                         val->intval = 1;
  69                 break;
  70         default:
  71                 return -EINVAL;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static __devinit int max8998_battery_probe(struct platform_device *pdev)
  78 {
  79         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  80         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
  81         struct max8998_battery_data *max8998;
  82         struct i2c_client *i2c;
  83         int ret = 0;
  84
  85         if (!pdata) {
  86                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
  87                 return -ENODEV;
  88         }
  89
  90         max8998 = kzalloc(sizeof(struct max8998_battery_data), GFP_KERNEL);
  91         if (!max8998)
  92                 return -ENOMEM;
  93
  94         max8998->dev = &pdev->dev;
  95         max8998->iodev = iodev;
  96         platform_set_drvdata(pdev, max8998);
  97         i2c = max8998->iodev->i2c;
  98
  99         /* Setup "End of Charge" */
 100         /* If EOC value equals 0,
 101          * remain value set from bootloader or default value */
 102         if (pdata->eoc >= 10 && pdata->eoc <= 45) {
 103                 max8998_update_reg(i2c, MAX8998_REG_CHGR1,
 104                                 (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
 105         } else if (pdata->eoc == 0) {
 106                 dev_dbg(max8998->dev,
 107                         "EOC value not set: leave it unchanged.\n");
 108         } else {
 109                 dev_err(max8998->dev, "Invalid EOC value\n");
 110                 ret = -EINVAL;
 111                 goto err;
 112         }
 113
 114         /* Setup Charge Restart Level */
 115         switch (pdata->restart) {
 116         case 100:
 117                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
 118                 break;
 119         case 150:
 120                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
 121                 break;
 122         case 200:
 123                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
 124                 break;
 125         case -1:
 126                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
 127                 break;
 128         case 0:
 129                 dev_dbg(max8998->dev,
 130                         "Restart Level not set: leave it unchanged.\n");
 131                 break;
 132         default:
 133                 dev_err(max8998->dev, "Invalid Restart Level\n");
 134                 ret = -EINVAL;
 135                 goto err;
 136         }
 137
 138         /* Setup Charge Full Timeout */
 139         switch (pdata->timeout) {
 140         case 5:
 141                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
 142                 break;
 143         case 6:
 144                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
 145                 break;
 146         case 7:
 147                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
 148                 break;
 149         case -1:
 150                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
 151                 break;
 152         case 0:
 153                 dev_dbg(max8998->dev,
 154                         "Full Timeout not set: leave it unchanged.\n");
 155         default:
 156                 dev_err(max8998->dev, "Invalid Full Timeout value\n");
 157                 ret = -EINVAL;
 158                 goto err;
 159         }
 160
 161         max8998->battery.name = "max8998_pmic";
 162         max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 163         max8998->battery.get_property = max8998_battery_get_property;
 164         max8998->battery.properties = max8998_battery_props;
 165         max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props);
 166
 167         ret = power_supply_register(max8998->dev, &max8998->battery);
 168         if (ret) {
 169                 dev_err(max8998->dev, "failed: power supply register\n");
 170                 goto err;
 171         }
 172
 173         return 0;
 174 err:
 175         kfree(max8998);
 176         return ret;
 177 }
 178
 179 static int __devexit max8998_battery_remove(struct platform_device *pdev)
 180 {
 181         struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
 182
 183         power_supply_unregister(&max8998->battery);
 184         kfree(max8998);
 185
 186         return 0;
 187 }
 188
 189 static const struct platform_device_id max8998_battery_id[] = {
 190         { "max8998-battery", TYPE_MAX8998 },
 191 };
 192
 193 static struct platform_driver max8998_battery_driver = {
 194         .driver = {
 195                 .name = "max8998-battery",
 196                 .owner = THIS_MODULE,
 197         },
 198         .probe = max8998_battery_probe,
 199         .remove = __devexit_p(max8998_battery_remove),
 200         .id_table = max8998_battery_id,
 201 };
 202
 203 static int __init max8998_battery_init(void)
 204 {
 205         return platform_driver_register(&max8998_battery_driver);
 206 }
 207 module_init(max8998_battery_init);
 208
 209 static void __exit max8998_battery_cleanup(void)
 210 {
 211         platform_driver_unregister(&max8998_battery_driver);
 212 }
 213 module_exit(max8998_battery_cleanup);
 214
 215 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
 216 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 217 MODULE_LICENSE("GPL");
 218 MODULE_ALIAS("platform:max8998-battery");