drivers/power/max8997_charger.c

   1 /*
   2  * max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966
   3  *
   4  *  Copyright (C) 2011 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/max8997.h>
  28 #include <linux/mfd/max8997-private.h>
  29
  30 struct charger_data {
  31         struct device *dev;
  32         struct max8997_dev *iodev;
  33         struct power_supply battery;
  34 };
  35
  36 static enum power_supply_property max8997_battery_props[] = {
  37         POWER_SUPPLY_PROP_STATUS, /* "FULL" or "NOT FULL" only. */
  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 max8997_battery_get_property(struct power_supply *psy,
  44                 enum power_supply_property psp,
  45                 union power_supply_propval *val)
  46 {
  47         struct charger_data *charger = container_of(psy,
  48                         struct charger_data, battery);
  49         struct i2c_client *i2c = charger->iodev->i2c;
  50         int ret;
  51         u8 reg;
  52
  53         switch (psp) {
  54         case POWER_SUPPLY_PROP_STATUS:
  55                 val->intval = 0;
  56                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  57                 if (ret)
  58                         return ret;
  59                 if ((reg & (1 << 0)) == 0x1)
  60                         val->intval = POWER_SUPPLY_STATUS_FULL;
  61
  62                 break;
  63         case POWER_SUPPLY_PROP_PRESENT:
  64                 val->intval = 0;
  65                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  66                 if (ret)
  67                         return ret;
  68                 if ((reg & (1 << 2)) == 0x0)
  69                         val->intval = 1;
  70
  71                 break;
  72         case POWER_SUPPLY_PROP_ONLINE:
  73                 val->intval = 0;
  74                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
  75                 if (ret)
  76                         return ret;
  77                 /* DCINOK */
  78                 if (reg & (1 << 1))
  79                         val->intval = 1;
  80
  81                 break;
  82         default:
  83                 return -EINVAL;
  84         }
  85
  86         return 0;
  87 }
  88
  89 static int max8997_battery_probe(struct platform_device *pdev)
  90 {
  91         int ret = 0;
  92         struct charger_data *charger;
  93         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  94         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
  95
  96         if (!pdata)
  97                 return -EINVAL;
  98
  99         if (pdata->eoc_mA) {
 100                 int val = (pdata->eoc_mA - 50) / 10;
 101                 if (val < 0)
 102                         val = 0;
 103                 if (val > 0xf)
 104                         val = 0xf;
 105
 106                 ret = max8997_update_reg(iodev->i2c,
 107                                 MAX8997_REG_MBCCTRL5, val, 0xf);
 108                 if (ret < 0) {
 109                         dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 110                         return ret;
 111                 }
 112         }
 113
 114         switch (pdata->timeout) {
 115         case 5:
 116                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 117                                 0x2 << 4, 0x7 << 4);
 118                 break;
 119         case 6:
 120                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 121                                 0x3 << 4, 0x7 << 4);
 122                 break;
 123         case 7:
 124                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 125                                 0x4 << 4, 0x7 << 4);
 126                 break;
 127         case 0:
 128                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 129                                 0x7 << 4, 0x7 << 4);
 130                 break;
 131         default:
 132                 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
 133                                 pdata->timeout);
 134                 return -EINVAL;
 135         }
 136         if (ret < 0) {
 137                 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 138                 return ret;
 139         }
 140
 141         charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
 142                                 GFP_KERNEL);
 143         if (charger == NULL) {
 144                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
 145                 return -ENOMEM;
 146         }
 147
 148         platform_set_drvdata(pdev, charger);
 149
 150         charger->battery.name = "max8997_pmic";
 151         charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 152         charger->battery.get_property = max8997_battery_get_property;
 153         charger->battery.properties = max8997_battery_props;
 154         charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
 155
 156         charger->dev = &pdev->dev;
 157         charger->iodev = iodev;
 158
 159         ret = power_supply_register(&pdev->dev, &charger->battery);
 160         if (ret) {
 161                 dev_err(&pdev->dev, "failed: power supply register\n");
 162                 return ret;
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int max8997_battery_remove(struct platform_device *pdev)
 169 {
 170         struct charger_data *charger = platform_get_drvdata(pdev);
 171
 172         power_supply_unregister(&charger->battery);
 173         return 0;
 174 }
 175
 176 static const struct platform_device_id max8997_battery_id[] = {
 177         { "max8997-battery", 0 },
 178         { }
 179 };
 180
 181 static struct platform_driver max8997_battery_driver = {
 182         .driver = {
 183                 .name = "max8997-battery",
 184                 .owner = THIS_MODULE,
 185         },
 186         .probe = max8997_battery_probe,
 187         .remove = max8997_battery_remove,
 188         .id_table = max8997_battery_id,
 189 };
 190
 191 static int __init max8997_battery_init(void)
 192 {
 193         return platform_driver_register(&max8997_battery_driver);
 194 }
 195 subsys_initcall(max8997_battery_init);
 196
 197 static void __exit max8997_battery_cleanup(void)
 198 {
 199         platform_driver_unregister(&max8997_battery_driver);
 200 }
 201 module_exit(max8997_battery_cleanup);
 202
 203 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
 204 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 205 MODULE_LICENSE("GPL");