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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 = power_supply_get_drvdata(psy);
 48         struct i2c_client *i2c = charger->iodev->i2c;
 49         int ret;
 50         u8 reg;
 51 
 52         switch (psp) {
 53         case POWER_SUPPLY_PROP_STATUS:
 54                 val->intval = 0;
 55                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 56                 if (ret)
 57                         return ret;
 58                 if ((reg & (1 << 0)) == 0x1)
 59                         val->intval = POWER_SUPPLY_STATUS_FULL;
 60 
 61                 break;
 62         case POWER_SUPPLY_PROP_PRESENT:
 63                 val->intval = 0;
 64                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 65                 if (ret)
 66                         return ret;
 67                 if ((reg & (1 << 2)) == 0x0)
 68                         val->intval = 1;
 69 
 70                 break;
 71         case POWER_SUPPLY_PROP_ONLINE:
 72                 val->intval = 0;
 73                 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, &reg);
 74                 if (ret)
 75                         return ret;
 76                 /* DCINOK */
 77                 if (reg & (1 << 1))
 78                         val->intval = 1;
 79 
 80                 break;
 81         default:
 82                 return -EINVAL;
 83         }
 84 
 85         return 0;
 86 }
 87 
 88 static const struct power_supply_desc max8997_battery_desc = {
 89         .name           = "max8997_pmic",
 90         .type           = POWER_SUPPLY_TYPE_BATTERY,
 91         .get_property   = max8997_battery_get_property,
 92         .properties     = max8997_battery_props,
 93         .num_properties = ARRAY_SIZE(max8997_battery_props),
 94 };
 95 
 96 static int max8997_battery_probe(struct platform_device *pdev)
 97 {
 98         int ret = 0;
 99         struct charger_data *charger;
100         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
101         struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
102         struct power_supply_config psy_cfg = {};
103 
104         if (!pdata)
105                 return -EINVAL;
106 
107         if (pdata->eoc_mA) {
108                 int val = (pdata->eoc_mA - 50) / 10;
109                 if (val < 0)
110                         val = 0;
111                 if (val > 0xf)
112                         val = 0xf;
113 
114                 ret = max8997_update_reg(iodev->i2c,
115                                 MAX8997_REG_MBCCTRL5, val, 0xf);
116                 if (ret < 0) {
117                         dev_err(&pdev->dev, "Cannot use i2c bus.\n");
118                         return ret;
119                 }
120         }
121 
122         switch (pdata->timeout) {
123         case 5:
124                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
125                                 0x2 << 4, 0x7 << 4);
126                 break;
127         case 6:
128                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
129                                 0x3 << 4, 0x7 << 4);
130                 break;
131         case 7:
132                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
133                                 0x4 << 4, 0x7 << 4);
134                 break;
135         case 0:
136                 ret = max8997_update_reg(iodev->i2c, MAX8997_REG_MBCCTRL1,
137                                 0x7 << 4, 0x7 << 4);
138                 break;
139         default:
140                 dev_err(&pdev->dev, "incorrect timeout value (%d)\n",
141                                 pdata->timeout);
142                 return -EINVAL;
143         }
144         if (ret < 0) {
145                 dev_err(&pdev->dev, "Cannot use i2c bus.\n");
146                 return ret;
147         }
148 
149         charger = devm_kzalloc(&pdev->dev, sizeof(struct charger_data),
150                                 GFP_KERNEL);
151         if (charger == NULL) {
152                 dev_err(&pdev->dev, "Cannot allocate memory.\n");
153                 return -ENOMEM;
154         }
155 
156         platform_set_drvdata(pdev, charger);
157 
158 
159         charger->dev = &pdev->dev;
160         charger->iodev = iodev;
161 
162         psy_cfg.drv_data = charger;
163 
164         charger->battery = power_supply_register(&pdev->dev,
165                                                  &max8997_battery_desc,
166                                                  &psy_cfg);
167         if (IS_ERR(charger->battery)) {
168                 dev_err(&pdev->dev, "failed: power supply register\n");
169                 return PTR_ERR(charger->battery);
170         }
171 
172         return 0;
173 }
174 
175 static int max8997_battery_remove(struct platform_device *pdev)
176 {
177         struct charger_data *charger = platform_get_drvdata(pdev);
178 
179         power_supply_unregister(charger->battery);
180         return 0;
181 }
182 
183 static const struct platform_device_id max8997_battery_id[] = {
184         { "max8997-battery", 0 },
185         { }
186 };
187 
188 static struct platform_driver max8997_battery_driver = {
189         .driver = {
190                 .name = "max8997-battery",
191         },
192         .probe = max8997_battery_probe,
193         .remove = max8997_battery_remove,
194         .id_table = max8997_battery_id,
195 };
196 
197 static int __init max8997_battery_init(void)
198 {
199         return platform_driver_register(&max8997_battery_driver);
200 }
201 subsys_initcall(max8997_battery_init);
202 
203 static void __exit max8997_battery_cleanup(void)
204 {
205         platform_driver_unregister(&max8997_battery_driver);
206 }
207 module_exit(max8997_battery_cleanup);
208 
209 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
210 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
211 MODULE_LICENSE("GPL");
212 

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