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, ®); 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, ®); 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 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 } 183 184 static const struct platform_device_id max8998_battery_id[] = { 185 { "max8998-battery", TYPE_MAX8998 }, 186 { } 187 }; 188 189 static 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 }; 196 197 module_platform_driver(max8998_battery_driver); 198 199 MODULE_DESCRIPTION("MAXIM 8998 battery control driver"); 200 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 201 MODULE_LICENSE("GPL"); 202 MODULE_ALIAS("platform:max8998-battery"); 203