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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | // SPDX-License-Identifier: GPL-2.0+ // // max8998_charger.c - Power supply consumer driver for the Maxim 8998/LP3974 // // Copyright (C) 2009-2010 Samsung Electronics // MyungJoo Ham <myungjoo.ham@samsung.com> #include <linux/err.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/power_supply.h> #include <linux/mfd/max8998.h> #include <linux/mfd/max8998-private.h> struct max8998_battery_data { struct device *dev; struct max8998_dev *iodev; struct power_supply *battery; }; static enum power_supply_property max8998_battery_props[] = { POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ POWER_SUPPLY_PROP_STATUS, /* charger is charging/discharging/full */ }; /* Note that the charger control is done by a current regulator "CHARGER" */ static int max8998_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max8998_battery_data *max8998 = power_supply_get_drvdata(psy); struct i2c_client *i2c = max8998->iodev->i2c; int ret; u8 reg; switch (psp) { case POWER_SUPPLY_PROP_PRESENT: ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); if (ret) return ret; if (reg & (1 << 4)) val->intval = 0; else val->intval = 1; break; case POWER_SUPPLY_PROP_ONLINE: ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); if (ret) return ret; if (reg & (1 << 5)) val->intval = 1; else val->intval = 0; break; case POWER_SUPPLY_PROP_STATUS: ret = max8998_read_reg(i2c, MAX8998_REG_STATUS2, ®); if (ret) return ret; if (!(reg & (1 << 5))) { val->intval = POWER_SUPPLY_STATUS_DISCHARGING; } else { if (reg & (1 << 6)) val->intval = POWER_SUPPLY_STATUS_FULL; else if (reg & (1 << 3)) val->intval = POWER_SUPPLY_STATUS_CHARGING; else val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; } break; default: return -EINVAL; } return 0; } static const struct power_supply_desc max8998_battery_desc = { .name = "max8998_pmic", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = max8998_battery_get_property, .properties = max8998_battery_props, .num_properties = ARRAY_SIZE(max8998_battery_props), }; static int max8998_battery_probe(struct platform_device *pdev) { struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max8998_platform_data *pdata = iodev->pdata; struct power_supply_config psy_cfg = {}; struct max8998_battery_data *max8998; struct i2c_client *i2c; int ret = 0; if (!pdata) { dev_err(pdev->dev.parent, "No platform init data supplied\n"); return -ENODEV; } max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_battery_data), GFP_KERNEL); if (!max8998) return -ENOMEM; max8998->dev = &pdev->dev; max8998->iodev = iodev; platform_set_drvdata(pdev, max8998); i2c = max8998->iodev->i2c; /* Setup "End of Charge" */ /* If EOC value equals 0, * remain value set from bootloader or default value */ if (pdata->eoc >= 10 && pdata->eoc <= 45) { max8998_update_reg(i2c, MAX8998_REG_CHGR1, (pdata->eoc / 5 - 2) << 5, 0x7 << 5); } else if (pdata->eoc == 0) { dev_dbg(max8998->dev, "EOC value not set: leave it unchanged.\n"); } else { dev_err(max8998->dev, "Invalid EOC value\n"); return -EINVAL; } /* Setup Charge Restart Level */ switch (pdata->restart) { case 100: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x1 << 3, 0x3 << 3); break; case 150: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x0 << 3, 0x3 << 3); break; case 200: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x2 << 3, 0x3 << 3); break; case -1: max8998_update_reg(i2c, MAX8998_REG_CHGR1, 0x3 << 3, 0x3 << 3); break; case 0: dev_dbg(max8998->dev, "Restart Level not set: leave it unchanged.\n"); break; default: dev_err(max8998->dev, "Invalid Restart Level\n"); return -EINVAL; } /* Setup Charge Full Timeout */ switch (pdata->timeout) { case 5: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x0 << 4, 0x3 << 4); break; case 6: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x1 << 4, 0x3 << 4); break; case 7: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x2 << 4, 0x3 << 4); break; case -1: max8998_update_reg(i2c, MAX8998_REG_CHGR2, 0x3 << 4, 0x3 << 4); break; case 0: dev_dbg(max8998->dev, "Full Timeout not set: leave it unchanged.\n"); break; default: dev_err(max8998->dev, "Invalid Full Timeout value\n"); return -EINVAL; } psy_cfg.drv_data = max8998; max8998->battery = devm_power_supply_register(max8998->dev, &max8998_battery_desc, &psy_cfg); if (IS_ERR(max8998->battery)) { ret = PTR_ERR(max8998->battery); dev_err(max8998->dev, "failed: power supply register: %d\n", ret); return ret; } return 0; } static const struct platform_device_id max8998_battery_id[] = { { "max8998-battery", TYPE_MAX8998 }, { } }; static struct platform_driver max8998_battery_driver = { .driver = { .name = "max8998-battery", }, .probe = max8998_battery_probe, .id_table = max8998_battery_id, }; module_platform_driver(max8998_battery_driver); MODULE_DESCRIPTION("MAXIM 8998 battery control driver"); MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:max8998-battery"); |