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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 = 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 
 77 static 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 
 85 static 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                 ret = -EINVAL;
121                 goto err;
122         }
123 
124         /* Setup Charge Restart Level */
125         switch (pdata->restart) {
126         case 100:
127                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3);
128                 break;
129         case 150:
130                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3);
131                 break;
132         case 200:
133                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3);
134                 break;
135         case -1:
136                 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3);
137                 break;
138         case 0:
139                 dev_dbg(max8998->dev,
140                         "Restart Level not set: leave it unchanged.\n");
141                 break;
142         default:
143                 dev_err(max8998->dev, "Invalid Restart Level\n");
144                 ret = -EINVAL;
145                 goto err;
146         }
147 
148         /* Setup Charge Full Timeout */
149         switch (pdata->timeout) {
150         case 5:
151                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4);
152                 break;
153         case 6:
154                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4);
155                 break;
156         case 7:
157                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4);
158                 break;
159         case -1:
160                 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4);
161                 break;
162         case 0:
163                 dev_dbg(max8998->dev,
164                         "Full Timeout not set: leave it unchanged.\n");
165                 break;
166         default:
167                 dev_err(max8998->dev, "Invalid Full Timeout value\n");
168                 ret = -EINVAL;
169                 goto err;
170         }
171 
172         psy_cfg.drv_data = max8998;
173 
174         max8998->battery = power_supply_register(max8998->dev,
175                                                  &max8998_battery_desc,
176                                                  &psy_cfg);
177         if (IS_ERR(max8998->battery)) {
178                 ret = PTR_ERR(max8998->battery);
179                 dev_err(max8998->dev, "failed: power supply register: %d\n",
180                         ret);
181                 goto err;
182         }
183 
184         return 0;
185 err:
186         return ret;
187 }
188 
189 static int max8998_battery_remove(struct platform_device *pdev)
190 {
191         struct max8998_battery_data *max8998 = platform_get_drvdata(pdev);
192 
193         power_supply_unregister(max8998->battery);
194 
195         return 0;
196 }
197 
198 static const struct platform_device_id max8998_battery_id[] = {
199         { "max8998-battery", TYPE_MAX8998 },
200         { }
201 };
202 
203 static struct platform_driver max8998_battery_driver = {
204         .driver = {
205                 .name = "max8998-battery",
206         },
207         .probe = max8998_battery_probe,
208         .remove = max8998_battery_remove,
209         .id_table = max8998_battery_id,
210 };
211 
212 module_platform_driver(max8998_battery_driver);
213 
214 MODULE_DESCRIPTION("MAXIM 8998 battery control driver");
215 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
216 MODULE_LICENSE("GPL");
217 MODULE_ALIAS("platform:max8998-battery");
218 

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