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/mod_devicetable.h> 25 #include <linux/slab.h> 26 #include <linux/platform_device.h> 27 #include <linux/power_supply.h> 28 #include <linux/mfd/max8998.h> 29 #include <linux/mfd/max8998-private.h> 30 31 struct max8998_battery_data { 32 struct device *dev; 33 struct max8998_dev *iodev; 34 struct power_supply *battery; 35 }; 36 37 static enum power_supply_property max8998_battery_props[] = { 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 max8998_battery_get_property(struct power_supply *psy, 44 enum power_supply_property psp, 45 union power_supply_propval *val) 46 { 47 struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy); 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, ®); 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, ®); 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 const struct power_supply_desc max8998_battery_desc = { 79 .name = "max8998_pmic", 80 .type = POWER_SUPPLY_TYPE_BATTERY, 81 .get_property = max8998_battery_get_property, 82 .properties = max8998_battery_props, 83 .num_properties = ARRAY_SIZE(max8998_battery_props), 84 }; 85 86 static int max8998_battery_probe(struct platform_device *pdev) 87 { 88 struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent); 89 struct max8998_platform_data *pdata = dev_get_platdata(iodev->dev); 90 struct power_supply_config psy_cfg = {}; 91 struct max8998_battery_data *max8998; 92 struct i2c_client *i2c; 93 int ret = 0; 94 95 if (!pdata) { 96 dev_err(pdev->dev.parent, "No platform init data supplied\n"); 97 return -ENODEV; 98 } 99 100 max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data), 101 GFP_KERNEL); 102 if (!max8998) 103 return -ENOMEM; 104 105 max8998->dev = &pdev->dev; 106 max8998->iodev = iodev; 107 platform_set_drvdata(pdev, max8998); 108 i2c = max8998->iodev->i2c; 109 110 /* Setup "End of Charge" */ 111 /* If EOC value equals 0, 112 * remain value set from bootloader or default value */ 113 if (pdata->eoc >= 10 && pdata->eoc <= 45) { 114 max8998_update_reg(i2c, MAX8998_REG_CHGR1, 115 (pdata->eoc / 5 - 2) << 5, 0x7 << 5); 116 } else if (pdata->eoc == 0) { 117 dev_dbg(max8998->dev, 118 "EOC value not set: leave it unchanged.\n"); 119 } else { 120 dev_err(max8998->dev, "Invalid EOC value\n"); 121 return -EINVAL; 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 return -EINVAL; 145 } 146 147 /* Setup Charge Full Timeout */ 148 switch (pdata->timeout) { 149 case 5: 150 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4); 151 break; 152 case 6: 153 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4); 154 break; 155 case 7: 156 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4); 157 break; 158 case -1: 159 max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4); 160 break; 161 case 0: 162 dev_dbg(max8998->dev, 163 "Full Timeout not set: leave it unchanged.\n"); 164 break; 165 default: 166 dev_err(max8998->dev, "Invalid Full Timeout value\n"); 167 return -EINVAL; 168 } 169 170 psy_cfg.drv_data = max8998; 171 172 max8998->battery = devm_power_supply_register(max8998->dev, 173 &max8998_battery_desc, 174 &psy_cfg); 175 if (IS_ERR(max8998->battery)) { 176 ret = PTR_ERR(max8998->battery); 177 dev_err(max8998->dev, "failed: power supply register: %d\n", 178 ret); 179 return ret; 180 } 181 182 return 0; 183 } 184 185 static const struct platform_device_id max8998_battery_id[] = { 186 { "max8998-battery", TYPE_MAX8998 }, 187 { } 188 }; 189 190 static struct platform_driver max8998_battery_driver = { 191 .driver = { 192 .name = "max8998-battery", 193 }, 194 .probe = max8998_battery_probe, 195 .id_table = max8998_battery_id, 196 }; 197 198 module_platform_driver(max8998_battery_driver); 199 200 MODULE_DESCRIPTION("MAXIM 8998 battery control driver"); 201 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 202 MODULE_LICENSE("GPL"); 203 MODULE_ALIAS("platform:max8998-battery"); 204