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