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 = power_supply_get_drvdata(psy);
  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 const struct power_supply_desc max8998_battery_desc = {
  78         .name           = "max8998_pmic",
  79         .type           = POWER_SUPPLY_TYPE_BATTERY,
  80         .get_property   = max8998_battery_get_property,
  81         .properties     = max8998_battery_props,
  82         .num_properties = ARRAY_SIZE(max8998_battery_props),
  83 };
  84
  85 static int max8998_battery_probe(struct platform_device *pdev)
  86 {
  87         struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  88         struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
  89         struct power_supply_config psy_cfg = {};
  90         struct max8998_battery_data *max8998;
  91         struct i2c_client *i2c;
  92         int ret = 0;
  93
  94         if (!pdata) {
  95                 dev_err(pdev->dev.parent, "No platform init data supplied\n");
  96                 return -ENODEV;
  97         }
  98
  99         max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
 100                                 GFP_KERNEL);
 101         if (!max8998)
 102                 return -ENOMEM;
 103
 104         max8998->dev = &pdev->dev;
 105         max8998->iodev = iodev;
 106         platform_set_drvdata(pdev, max8998);
 107         i2c = max8998->iodev->i2c;
 108
 109         /* Setup "End of Charge" */
 110         /* If EOC value equals 0,
 111          * remain value set from bootloader or default value */
 112         if (pdata->eoc >= 10 && pdata->eoc <= 45) {
 113                 max8998_update_reg(i2c, MAX8998_REG_CHGR1,
 114                                 (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
 115         } else if (pdata->eoc == 0) {
 116                 dev_dbg(max8998->dev,
 117                         "EOC value not set: leave it unchanged.\n");
 118         } else {
 119                 dev_err(max8998->dev, "Invalid EOC value\n");
 120                 return -EINVAL;
 121         }
 122
 123         /* Setup Charge Restart Level */
 124         switch (pdata->restart) {
 125         case 100:
 126                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
 127                 break;
 128         case 150:
 129                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
 130                 break;
 131         case 200:
 132                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
 133                 break;
 134         case -1:
 135                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
 136                 break;
 137         case 0:
 138                 dev_dbg(max8998->dev,
 139                         "Restart Level not set: leave it unchanged.\n");
 140                 break;
 141         default:
 142                 dev_err(max8998->dev, "Invalid Restart Level\n");
 143                 return -EINVAL;
 144         }
 145
 146         /* Setup Charge Full Timeout */
 147         switch (pdata->timeout) {
 148         case 5:
 149                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
 150                 break;
 151         case 6:
 152                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
 153                 break;
 154         case 7:
 155                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
 156                 break;
 157         case -1:
 158                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
 159                 break;
 160         case 0:
 161                 dev_dbg(max8998->dev,
 162                         "Full Timeout not set: leave it unchanged.\n");
 163                 break;
 164         default:
 165                 dev_err(max8998->dev, "Invalid Full Timeout value\n");
 166                 return -EINVAL;
 167         }
 168
 169         psy_cfg.drv_data = max8998;
 170
 171         max8998->battery = devm_power_supply_register(max8998->dev,
 172                                                       &max8998_battery_desc,
 173                                                       &psy_cfg);
 174         if (IS_ERR(max8998->battery)) {
 175                 ret = PTR_ERR(max8998->battery);
 176                 dev_err(max8998->dev, "failed: power supply register: %d\n",
 177                         ret);
 178                 return ret;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static const struct platform_device_id max8998_battery_id[] = {
 185         { "max8998-battery", TYPE_MAX8998 },
 186         { }
 187 };
 188
 189 static struct platform_driver max8998_battery_driver = {
 190         .driver = {
 191                 .name = "max8998-battery",
 192         },
 193         .probe = max8998_battery_probe,
 194         .id_table = max8998_battery_id,
 195 };
 196
 197 module_platform_driver(max8998_battery_driver);
 198
 199 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
 200 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 201 MODULE_LICENSE("GPL");
 202 MODULE_ALIAS("platform:max8998-battery");