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