linux/drivers/power/max8998_charger.c
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   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
  30struct max8998_battery_data {
  31        struct device *dev;
  32        struct max8998_dev *iodev;
  33        struct power_supply battery;
  34};
  35
  36static 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" */
  42static 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 = container_of(psy,
  47                        struct max8998_battery_data, battery);
  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
  78static int max8998_battery_probe(struct platform_device *pdev)
  79{
  80        struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  81        struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
  82        struct max8998_battery_data *max8998;
  83        struct i2c_client *i2c;
  84        int ret = 0;
  85
  86        if (!pdata) {
  87                dev_err(pdev->dev.parent, "No platform init data supplied\n");
  88                return -ENODEV;
  89        }
  90
  91        max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
  92                                GFP_KERNEL);
  93        if (!max8998)
  94                return -ENOMEM;
  95
  96        max8998->dev = &pdev->dev;
  97        max8998->iodev = iodev;
  98        platform_set_drvdata(pdev, max8998);
  99        i2c = max8998->iodev->i2c;
 100
 101        /* Setup "End of Charge" */
 102        /* If EOC value equals 0,
 103         * remain value set from bootloader or default value */
 104        if (pdata->eoc >= 10 && pdata->eoc <= 45) {
 105                max8998_update_reg(i2c, MAX8998_REG_CHGR1,
 106                                (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
 107        } else if (pdata->eoc == 0) {
 108                dev_dbg(max8998->dev,
 109                        "EOC value not set: leave it unchanged.\n");
 110        } else {
 111                dev_err(max8998->dev, "Invalid EOC value\n");
 112                ret = -EINVAL;
 113                goto err;
 114        }
 115
 116        /* Setup Charge Restart Level */
 117        switch (pdata->restart) {
 118        case 100:
 119                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
 120                break;
 121        case 150:
 122                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
 123                break;
 124        case 200:
 125                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
 126                break;
 127        case -1:
 128                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
 129                break;
 130        case 0:
 131                dev_dbg(max8998->dev,
 132                        "Restart Level not set: leave it unchanged.\n");
 133                break;
 134        default:
 135                dev_err(max8998->dev, "Invalid Restart Level\n");
 136                ret = -EINVAL;
 137                goto err;
 138        }
 139
 140        /* Setup Charge Full Timeout */
 141        switch (pdata->timeout) {
 142        case 5:
 143                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
 144                break;
 145        case 6:
 146                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
 147                break;
 148        case 7:
 149                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
 150                break;
 151        case -1:
 152                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
 153                break;
 154        case 0:
 155                dev_dbg(max8998->dev,
 156                        "Full Timeout not set: leave it unchanged.\n");
 157                break;
 158        default:
 159                dev_err(max8998->dev, "Invalid Full Timeout value\n");
 160                ret = -EINVAL;
 161                goto err;
 162        }
 163
 164        max8998->battery.name = "max8998_pmic";
 165        max8998->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 166        max8998->battery.get_property = max8998_battery_get_property;
 167        max8998->battery.properties = max8998_battery_props;
 168        max8998->battery.num_properties = ARRAY_SIZE(max8998_battery_props);
 169
 170        ret = power_supply_register(max8998->dev, &max8998->battery);
 171        if (ret) {
 172                dev_err(max8998->dev, "failed: power supply register\n");
 173                goto err;
 174        }
 175
 176        return 0;
 177err:
 178        return ret;
 179}
 180
 181static int max8998_battery_remove(struct platform_device *pdev)
 182{
 183        struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
 184
 185        power_supply_unregister(&max8998->battery);
 186
 187        return 0;
 188}
 189
 190static const struct platform_device_id max8998_battery_id[] = {
 191        { "max8998-battery", TYPE_MAX8998 },
 192        { }
 193};
 194
 195static struct platform_driver max8998_battery_driver = {
 196        .driver = {
 197                .name = "max8998-battery",
 198                .owner = THIS_MODULE,
 199        },
 200        .probe = max8998_battery_probe,
 201        .remove = max8998_battery_remove,
 202        .id_table = max8998_battery_id,
 203};
 204
 205module_platform_driver(max8998_battery_driver);
 206
 207MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
 208MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 209MODULE_LICENSE("GPL");
 210MODULE_ALIAS("platform:max8998-battery");
 211
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