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Linux/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 = container_of(psy,
 48                         struct charger_data, battery);
 49         struct i2c_client *i2c = charger->iodev->i2c;
 50         int ret;
 51         u8 reg;
 52 
 53         switch (psp) {
 54         case POWER_SUPPLY_PROP_STATUS:
 55                 val->intval = 0;
 56                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 57                 if (ret)
 58                         return ret;
 59                 if ((reg & (1 << 0)) == 0x1)
 60                         val->intval = POWER_SUPPLY_STATUS_FULL;
 61 
 62                 break;
 63         case POWER_SUPPLY_PROP_PRESENT:
 64                 val->intval = 0;
 65                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 66                 if (ret)
 67                         return ret;
 68                 if ((reg & (1 << 2)) == 0x0)
 69                         val->intval = 1;
 70 
 71                 break;
 72         case POWER_SUPPLY_PROP_ONLINE:
 73                 val->intval = 0;
 74                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 75                 if (ret)
 76                         return ret;
 77                 /* DCINOK */
 78                 if (reg & (1 << 1))
 79                         val->intval = 1;
 80 
 81                 break;
 82         default:
 83                 return -EINVAL;
 84         }
 85 
 86         return 0;
 87 }
 88 
 89 static int max8997_battery_probe(struct platform_device *pdev)
 90 {
 91         int ret = 0;
 92         struct charger_data *charger;
 93         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 94         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
 95 
 96         if (!pdata)
 97                 return -EINVAL;
 98 
 99         if (pdata->eoc_mA) {
100                 int val = (pdata->eoc_mA - 50) / 10;
101                 if (val < 0)
102                         val = 0;
103                 if (val > 0xf)
104                         val = 0xf;
105 
106                 ret = max8997_update_reg(iodev->i2c,
107                                 MAX8997_REG_MBCCTRL5, val, 0xf);
108                 if (ret < 0) {
109                         dev_err(&pdev->dev, "Cannot use i2c bus.\n");
110                         return ret;
111                 }
112         }
113 
114         switch (pdata->timeout) {
115         case 5:
116                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
117                                 0x2 << 4, 0x7 << 4);
118                 break;
119         case 6:
120                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
121                                 0x3 << 4, 0x7 << 4);
122                 break;
123         case 7:
124                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
125                                 0x4 << 4, 0x7 << 4);
126                 break;
127         case 0:
128                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
129                                 0x7 << 4, 0x7 << 4);
130                 break;
131         default:
132                 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
133                                 pdata->timeout);
134                 return -EINVAL;
135         }
136         if (ret < 0) {
137                 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
138                 return ret;
139         }
140 
141         charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
142                                 GFP_KERNEL);
143         if (charger == NULL) {
144                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
145                 return -ENOMEM;
146         }
147 
148         platform_set_drvdata(pdev, charger);
149 
150         charger->battery.name = "max8997_pmic";
151         charger->battery.type = POWER_SUPPLY_TYPE_BATTERY;
152         charger->battery.get_property = max8997_battery_get_property;
153         charger->battery.properties = max8997_battery_props;
154         charger->battery.num_properties = ARRAY_SIZE(max8997_battery_props);
155 
156         charger->dev = &pdev->dev;
157         charger->iodev = iodev;
158 
159         ret = power_supply_register(&pdev->dev, &charger->battery);
160         if (ret) {
161                 dev_err(&pdev->dev, "failed: power supply register\n");
162                 return ret;
163         }
164 
165         return 0;
166 }
167 
168 static int max8997_battery_remove(struct platform_device *pdev)
169 {
170         struct charger_data *charger = platform_get_drvdata(pdev);
171 
172         power_supply_unregister(&charger->battery);
173         return 0;
174 }
175 
176 static const struct platform_device_id max8997_battery_id[] = {
177         { "max8997-battery", 0 },
178         { }
179 };
180 
181 static struct platform_driver max8997_battery_driver = {
182         .driver = {
183                 .name = "max8997-battery",
184                 .owner = THIS_MODULE,
185         },
186         .probe = max8997_battery_probe,
187         .remove = max8997_battery_remove,
188         .id_table = max8997_battery_id,
189 };
190 
191 static int __init max8997_battery_init(void)
192 {
193         return platform_driver_register(&max8997_battery_driver);
194 }
195 subsys_initcall(max8997_battery_init);
196 
197 static void __exit max8997_battery_cleanup(void)
198 {
199         platform_driver_unregister(&max8997_battery_driver);
200 }
201 module_exit(max8997_battery_cleanup);
202 
203 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
204 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
205 MODULE_LICENSE("GPL");
206 

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