LXR linux/drivers/power/supply/max8998

   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 = power_supply_get_drvdata(psy);
  47        struct i2c_client *i2c = max8998->iodev->i2c;
  48        int ret;
  49        u8 reg;
  50
  51        switch (psp) {
  52        case POWER_SUPPLY_PROP_PRESENT:
  53                ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  54                if (ret)
  55                        return ret;
  56                if (reg & (1 << 4))
  57                        val->intval = 0;
  58                else
  59                        val->intval = 1;
  60                break;
  61        case POWER_SUPPLY_PROP_ONLINE:
  62                ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, &reg);
  63                if (ret)
  64                        return ret;
  65                if (reg & (1 << 3))
  66                        val->intval = 0;
  67                else
  68                        val->intval = 1;
  69                break;
  70        default:
  71                return -EINVAL;
  72        }
  73
  74        return 0;
  75}
  76
  77static const struct power_supply_desc max8998_battery_desc = {
  78        .name           = "max8998_pmic",
  79        .type           = POWER_SUPPLY_TYPE_BATTERY,
  80        .get_property   = max8998_battery_get_property,
  81        .properties     = max8998_battery_props,
  82        .num_properties = ARRAY_SIZE(max8998_battery_props),
  83};
  84
  85static int max8998_battery_probe(struct platform_device *pdev)
  86{
  87        struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
  88        struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev);
  89        struct power_supply_config psy_cfg = {};
  90        struct max8998_battery_data *max8998;
  91        struct i2c_client *i2c;
  92        int ret = 0;
  93
  94        if (!pdata) {
  95                dev_err(pdev->dev.parent, "No platform init data supplied\n");
  96                return -ENODEV;
  97        }
  98
  99        max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data),
 100                                GFP_KERNEL);
 101        if (!max8998)
 102                return -ENOMEM;
 103
 104        max8998->dev = &pdev->dev;
 105        max8998->iodev = iodev;
 106        platform_set_drvdata(pdev, max8998);
 107        i2c = max8998->iodev->i2c;
 108
 109        /* Setup "End of Charge" */
 110        /* If EOC value equals 0,
 111         * remain value set from bootloader or default value */
 112        if (pdata->eoc >= 10 && pdata->eoc <= 45) {
 113                max8998_update_reg(i2c, MAX8998_REG_CHGR1,
 114                                (pdata->eoc / 5 - 2) << 5, 0x7 << 5);
 115        } else if (pdata->eoc == 0) {
 116                dev_dbg(max8998->dev,
 117                        "EOC value not set: leave it unchanged.\n");
 118        } else {
 119                dev_err(max8998->dev, "Invalid EOC value\n");
 120                return -EINVAL;
 121        }
 122
 123        /* Setup Charge Restart Level */
 124        switch (pdata->restart) {
 125        case 100:
 126                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
 127                break;
 128        case 150:
 129                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
 130                break;
 131        case 200:
 132                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
 133                break;
 134        case -1:
 135                max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
 136                break;
 137        case 0:
 138                dev_dbg(max8998->dev,
 139                        "Restart Level not set: leave it unchanged.\n");
 140                break;
 141        default:
 142                dev_err(max8998->dev, "Invalid Restart Level\n");
 143                return -EINVAL;
 144        }
 145
 146        /* Setup Charge Full Timeout */
 147        switch (pdata->timeout) {
 148        case 5:
 149                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
 150                break;
 151        case 6:
 152                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
 153                break;
 154        case 7:
 155                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
 156                break;
 157        case -1:
 158                max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
 159                break;
 160        case 0:
 161                dev_dbg(max8998->dev,
 162                        "Full Timeout not set: leave it unchanged.\n");
 163                break;
 164        default:
 165                dev_err(max8998->dev, "Invalid Full Timeout value\n");
 166                return -EINVAL;
 167        }
 168
 169        psy_cfg.drv_data = max8998;
 170
 171        max8998->battery = devm_power_supply_register(max8998->dev,
 172                                                      &max8998_battery_desc,
 173                                                      &psy_cfg);
 174        if (IS_ERR(max8998->battery)) {
 175                ret = PTR_ERR(max8998->battery);
 176                dev_err(max8998->dev, "failed: power supply register: %d\n",
 177                        ret);
 178                return ret;
 179        }
 180
 181        return 0;
 182}
 183
 184static const struct platform_device_id max8998_battery_id[] = {
 185        { "max8998-battery", TYPE_MAX8998 },
 186        { }
 187};
 188
 189static struct platform_driver max8998_battery_driver = {
 190        .driver = {
 191                .name = "max8998-battery",
 192        },
 193        .probe = max8998_battery_probe,
 194        .id_table = max8998_battery_id,
 195};
 196
 197module_platform_driver(max8998_battery_driver);
 198
 199MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
 200MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 201MODULE_LICENSE("GPL");
 202MODULE_ALIAS("platform:max8998-battery");
 203