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/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/power_supply.h>
  27 #include <linux/mfd/max8998.h>
  28 #include <linux/mfd/max8998-private.h>
  29
  30 struct max8998_battery_data {
  31         struct device *dev;
  32         struct max8998_dev *iodev;
  33         struct power_supply battery;
  34 };
  35
  36 static enum power_supply_property max8998_battery_props[] = {
  37         POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */
  38         POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */
  39 };
  40
  41 /* Note that the charger control is done by a current regulator "CHARGER" */
  42 static int max8998_battery_get_property(struct power_supply *psy,
  43                 enum power_supply_property psp,
  44                 union power_supply_propval *val)
  45 {
  46         struct max8998_battery_data *max8998 = container_of(psy,
  47                         struct max8998_battery_data, battery);
  48         struct i2c_client *i2c = max8998->iodev->i2c;
  49         int ret;
  50         u8 reg;
  51
  52         switch (psp) {
  53         case POWER_SUPPLY_PROP_PRESENT:
  54                 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  55                 if (ret)
  56                         return ret;
  57                 if (reg & (1 << 4))
  58                         val->intval = 0;
  59                 else
  60                         val->intval = 1;
  61                 break;
  62         case POWER_SUPPLY_PROP_ONLINE:
  63                 ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  64                 if (ret)
  65                         return ret;
  66                 if (reg & (1 << 3))
  67                         val->intval = 0;
  68                 else
  69                         val->intval = 1;
  70                 break;
  71         default:
  72                 return -EINVAL;
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int max8998_battery_probe(struct platform_device *pdev)
  79 {
  80         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  81         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
  82         struct max8998_battery_data *max8998;
  83         struct i2c_client *i2c;
  84         int ret = 0;
  85
  86         if (!pdata) {
  87                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
  88                 return -ENODEV;
  89         }
  90
  91         max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
  92                                 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         return ret;
 179 }
 180
 181 static int max8998_battery_remove(struct platform_device *pdev)
 182 {
 183         struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
 184
 185         power_supply_unregister(&max8998->battery);
 186
 187         return 0;
 188 }
 189
 190 static const struct platform_device_id max8998_battery_id[] = {
 191         { "max8998-battery", TYPE_MAX8998 },
 192         { }
 193 };
 194
 195 static struct platform_driver max8998_battery_driver = {
 196         .driver = {
 197                 .name = "max8998-battery",
 198                 .owner = THIS_MODULE,
 199         },
 200         .probe = max8998_battery_probe,
 201         .remove = max8998_battery_remove,
 202         .id_table = max8998_battery_id,
 203 };
 204
 205 module_platform_driver(max8998_battery_driver);
 206
 207 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
 208 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 209 MODULE_LICENSE("GPL");
 210 MODULE_ALIAS("platform:max8998-battery");