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Linux/drivers/power/max8998_charger.c

  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 
 30 struct max8998_battery_data {
 31         struct device *dev;
 32         struct max8998_dev *iodev;
 33         struct power_supply battery;
 34 };
 35 
 36 static 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" */
 42 static 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 
 78 static 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;
177 err:
178         return ret;
179 }
180 
181 static 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 
190 static const struct platform_device_id max8998_battery_id[] = {
191         { "max8998-battery", TYPE_MAX8998 },
192         { }
193 };
194 
195 static 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 
205 module_platform_driver(max8998_battery_driver);
206 
207 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
208 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
209 MODULE_LICENSE("GPL");
210 MODULE_ALIAS("platform:max8998-battery");
211 

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