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 = power_supply_get_drvdata(psy);
  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 const struct power_supply_desc max8997_battery_desc = {
  89         .name           = "max8997_pmic",
  90         .type           = POWER_SUPPLY_TYPE_BATTERY,
  91         .get_property   = max8997_battery_get_property,
  92         .properties     = max8997_battery_props,
  93         .num_properties = ARRAY_SIZE(max8997_battery_props),
  94 };
  95
  96 static int max8997_battery_probe(struct platform_device *pdev)
  97 {
  98         int ret = 0;
  99         struct charger_data *charger;
 100         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 101         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
 102         struct power_supply_config psy_cfg = {};
 103
 104         if (!pdata)
 105                 return -EINVAL;
 106
 107         if (pdata->eoc_mA) {
 108                 int val = (pdata->eoc_mA - 50) / 10;
 109                 if (val < 0)
 110                         val = 0;
 111                 if (val > 0xf)
 112                         val = 0xf;
 113
 114                 ret = max8997_update_reg(iodev->i2c,
 115                                 MAX8997_REG_MBCCTRL5, val, 0xf);
 116                 if (ret < 0) {
 117                         dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 118                         return ret;
 119                 }
 120         }
 121
 122         switch (pdata->timeout) {
 123         case 5:
 124                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 125                                 0x2 << 4, 0x7 << 4);
 126                 break;
 127         case 6:
 128                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 129                                 0x3 << 4, 0x7 << 4);
 130                 break;
 131         case 7:
 132                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 133                                 0x4 << 4, 0x7 << 4);
 134                 break;
 135         case 0:
 136                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
 137                                 0x7 << 4, 0x7 << 4);
 138                 break;
 139         default:
 140                 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
 141                                 pdata->timeout);
 142                 return -EINVAL;
 143         }
 144         if (ret < 0) {
 145                 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
 146                 return ret;
 147         }
 148
 149         charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
 150                                 GFP_KERNEL);
 151         if (charger == NULL) {
 152                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
 153                 return -ENOMEM;
 154         }
 155
 156         platform_set_drvdata(pdev, charger);
 157
 158
 159         charger->dev = &pdev->dev;
 160         charger->iodev = iodev;
 161
 162         psy_cfg.drv_data = charger;
 163
 164         charger->battery = power_supply_register(&pdev->dev,
 165                                                  &max8997_battery_desc,
 166                                                  &psy_cfg);
 167         if (IS_ERR(charger->battery)) {
 168                 dev_err(&pdev->dev, "failed: power supply register\n");
 169                 return PTR_ERR(charger->battery);
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int max8997_battery_remove(struct platform_device *pdev)
 176 {
 177         struct charger_data *charger = platform_get_drvdata(pdev);
 178
 179         power_supply_unregister(charger->battery);
 180         return 0;
 181 }
 182
 183 static const struct platform_device_id max8997_battery_id[] = {
 184         { "max8997-battery", 0 },
 185         { }
 186 };
 187
 188 static struct platform_driver max8997_battery_driver = {
 189         .driver = {
 190                 .name = "max8997-battery",
 191         },
 192         .probe = max8997_battery_probe,
 193         .remove = max8997_battery_remove,
 194         .id_table = max8997_battery_id,
 195 };
 196
 197 static int __init max8997_battery_init(void)
 198 {
 199         return platform_driver_register(&max8997_battery_driver);
 200 }
 201 subsys_initcall(max8997_battery_init);
 202
 203 static void __exit max8997_battery_cleanup(void)
 204 {
 205         platform_driver_unregister(&max8997_battery_driver);
 206 }
 207 module_exit(max8997_battery_cleanup);
 208
 209 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
 210 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 211 MODULE_LICENSE("GPL");