1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // max8997_charger.c - Power supply consumer driver for the Maxim 8997/8966 4 // 5 // Copyright (C) 2011 Samsung Electronics 6 // MyungJoo Ham <myungjoo.ham@samsung.com> 7 8 #include <linux/err.h> 9 #include <linux/extcon.h> 10 #include <linux/module.h> 11 #include <linux/slab.h> 12 #include <linux/platform_device.h> 13 #include <linux/power_supply.h> 14 #include <linux/mfd/max8997.h> 15 #include <linux/mfd/max8997-private.h> 16 #include <linux/regulator/consumer.h> 17 18 /* MAX8997_REG_STATUS4 */ 19 #define DCINOK_SHIFT 1 20 #define DCINOK_MASK (1 << DCINOK_SHIFT) 21 #define DETBAT_SHIFT 2 22 #define DETBAT_MASK (1 << DETBAT_SHIFT) 23 24 /* MAX8997_REG_MBCCTRL1 */ 25 #define TFCH_SHIFT 4 26 #define TFCH_MASK (7 << TFCH_SHIFT) 27 28 /* MAX8997_REG_MBCCTRL5 */ 29 #define ITOPOFF_SHIFT 0 30 #define ITOPOFF_MASK (0xF << ITOPOFF_SHIFT) 31 32 struct charger_data { 33 struct device *dev; 34 struct max8997_dev *iodev; 35 struct power_supply *battery; 36 struct regulator *reg; 37 struct extcon_dev *edev; 38 struct notifier_block extcon_nb; 39 struct work_struct extcon_work; 40 }; 41 42 static enum power_supply_property max8997_battery_props[] = { 43 POWER_SUPPLY_PROP_STATUS, /* "FULL", "CHARGING" or "DISCHARGING". */ 44 POWER_SUPPLY_PROP_PRESENT, /* the presence of battery */ 45 POWER_SUPPLY_PROP_ONLINE, /* charger is active or not */ 46 }; 47 48 /* Note that the charger control is done by a current regulator "CHARGER" */ 49 static int max8997_battery_get_property(struct power_supply *psy, 50 enum power_supply_property psp, 51 union power_supply_propval *val) 52 { 53 struct charger_data *charger = power_supply_get_drvdata(psy); 54 struct i2c_client *i2c = charger->iodev->i2c; 55 int ret; 56 u8 reg; 57 58 switch (psp) { 59 case POWER_SUPPLY_PROP_STATUS: 60 val->intval = 0; 61 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); 62 if (ret) 63 return ret; 64 if ((reg & (1 << 0)) == 0x1) 65 val->intval = POWER_SUPPLY_STATUS_FULL; 66 else if ((reg & DCINOK_MASK)) 67 val->intval = POWER_SUPPLY_STATUS_CHARGING; 68 else 69 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 70 71 break; 72 case POWER_SUPPLY_PROP_PRESENT: 73 val->intval = 0; 74 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); 75 if (ret) 76 return ret; 77 if ((reg & DETBAT_MASK) == 0x0) 78 val->intval = 1; 79 80 break; 81 case POWER_SUPPLY_PROP_ONLINE: 82 val->intval = 0; 83 ret = max8997_read_reg(i2c, MAX8997_REG_STATUS4, ®); 84 if (ret) 85 return ret; 86 if (reg & DCINOK_MASK) 87 val->intval = 1; 88 89 break; 90 default: 91 return -EINVAL; 92 } 93 94 return 0; 95 } 96 97 static void max8997_battery_extcon_evt_stop_work(void *data) 98 { 99 struct charger_data *charger = data; 100 101 cancel_work_sync(&charger->extcon_work); 102 } 103 104 static void max8997_battery_extcon_evt_worker(struct work_struct *work) 105 { 106 struct charger_data *charger = 107 container_of(work, struct charger_data, extcon_work); 108 struct extcon_dev *edev = charger->edev; 109 int current_limit; 110 111 if (extcon_get_state(edev, EXTCON_CHG_USB_SDP) > 0) { 112 dev_dbg(charger->dev, "USB SDP charger is connected\n"); 113 current_limit = 450000; 114 } else if (extcon_get_state(edev, EXTCON_CHG_USB_DCP) > 0) { 115 dev_dbg(charger->dev, "USB DCP charger is connected\n"); 116 current_limit = 650000; 117 } else if (extcon_get_state(edev, EXTCON_CHG_USB_FAST) > 0) { 118 dev_dbg(charger->dev, "USB FAST charger is connected\n"); 119 current_limit = 650000; 120 } else if (extcon_get_state(edev, EXTCON_CHG_USB_SLOW) > 0) { 121 dev_dbg(charger->dev, "USB SLOW charger is connected\n"); 122 current_limit = 650000; 123 } else if (extcon_get_state(edev, EXTCON_CHG_USB_CDP) > 0) { 124 dev_dbg(charger->dev, "USB CDP charger is connected\n"); 125 current_limit = 650000; 126 } else { 127 dev_dbg(charger->dev, "USB charger is disconnected\n"); 128 current_limit = -1; 129 } 130 131 if (current_limit > 0) { 132 int ret = regulator_set_current_limit(charger->reg, current_limit, current_limit); 133 134 if (ret) { 135 dev_err(charger->dev, "failed to set current limit: %d\n", ret); 136 return; 137 } 138 ret = regulator_enable(charger->reg); 139 if (ret) 140 dev_err(charger->dev, "failed to enable regulator: %d\n", ret); 141 } else { 142 int ret = regulator_disable(charger->reg); 143 144 if (ret) 145 dev_err(charger->dev, "failed to disable regulator: %d\n", ret); 146 } 147 } 148 149 static int max8997_battery_extcon_evt(struct notifier_block *nb, 150 unsigned long event, void *param) 151 { 152 struct charger_data *charger = 153 container_of(nb, struct charger_data, extcon_nb); 154 schedule_work(&charger->extcon_work); 155 return NOTIFY_OK; 156 } 157 158 static const struct power_supply_desc max8997_battery_desc = { 159 .name = "max8997_pmic", 160 .type = POWER_SUPPLY_TYPE_BATTERY, 161 .get_property = max8997_battery_get_property, 162 .properties = max8997_battery_props, 163 .num_properties = ARRAY_SIZE(max8997_battery_props), 164 }; 165 166 static int max8997_battery_probe(struct platform_device *pdev) 167 { 168 int ret = 0; 169 struct charger_data *charger; 170 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); 171 struct device_node *np = pdev->dev.of_node; 172 struct i2c_client *i2c = iodev->i2c; 173 struct max8997_platform_data *pdata = iodev->pdata; 174 struct power_supply_config psy_cfg = {}; 175 176 if (!pdata) { 177 dev_err(&pdev->dev, "No platform data supplied.\n"); 178 return -EINVAL; 179 } 180 181 if (pdata->eoc_mA) { 182 int val = (pdata->eoc_mA - 50) / 10; 183 if (val < 0) 184 val = 0; 185 if (val > 0xf) 186 val = 0xf; 187 188 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL5, 189 val << ITOPOFF_SHIFT, ITOPOFF_MASK); 190 if (ret < 0) { 191 dev_err(&pdev->dev, "Cannot use i2c bus.\n"); 192 return ret; 193 } 194 } 195 switch (pdata->timeout) { 196 case 5: 197 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, 198 0x2 << TFCH_SHIFT, TFCH_MASK); 199 break; 200 case 6: 201 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, 202 0x3 << TFCH_SHIFT, TFCH_MASK); 203 break; 204 case 7: 205 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, 206 0x4 << TFCH_SHIFT, TFCH_MASK); 207 break; 208 case 0: 209 ret = max8997_update_reg(i2c, MAX8997_REG_MBCCTRL1, 210 0x7 << TFCH_SHIFT, TFCH_MASK); 211 break; 212 default: 213 dev_err(&pdev->dev, "incorrect timeout value (%d)\n", 214 pdata->timeout); 215 return -EINVAL; 216 } 217 if (ret < 0) { 218 dev_err(&pdev->dev, "Cannot use i2c bus.\n"); 219 return ret; 220 } 221 222 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); 223 if (!charger) 224 return -ENOMEM; 225 226 platform_set_drvdata(pdev, charger); 227 228 charger->dev = &pdev->dev; 229 charger->iodev = iodev; 230 231 psy_cfg.drv_data = charger; 232 233 charger->battery = devm_power_supply_register(&pdev->dev, 234 &max8997_battery_desc, 235 &psy_cfg); 236 if (IS_ERR(charger->battery)) { 237 dev_err(&pdev->dev, "failed: power supply register\n"); 238 return PTR_ERR(charger->battery); 239 } 240 241 // grab regulator from parent device's node 242 pdev->dev.of_node = iodev->dev->of_node; 243 charger->reg = devm_regulator_get_optional(&pdev->dev, "charger"); 244 pdev->dev.of_node = np; 245 if (IS_ERR(charger->reg)) { 246 if (PTR_ERR(charger->reg) == -EPROBE_DEFER) 247 return -EPROBE_DEFER; 248 dev_info(&pdev->dev, "couldn't get charger regulator\n"); 249 } 250 charger->edev = extcon_get_extcon_dev("max8997-muic"); 251 if (IS_ERR_OR_NULL(charger->edev)) { 252 if (!charger->edev) 253 return -EPROBE_DEFER; 254 dev_info(charger->dev, "couldn't get extcon device\n"); 255 } 256 257 if (!IS_ERR(charger->reg) && !IS_ERR_OR_NULL(charger->edev)) { 258 INIT_WORK(&charger->extcon_work, max8997_battery_extcon_evt_worker); 259 ret = devm_add_action(&pdev->dev, max8997_battery_extcon_evt_stop_work, charger); 260 if (ret) { 261 dev_err(&pdev->dev, "failed to add extcon evt stop action: %d\n", ret); 262 return ret; 263 } 264 charger->extcon_nb.notifier_call = max8997_battery_extcon_evt; 265 ret = devm_extcon_register_notifier_all(&pdev->dev, charger->edev, 266 &charger->extcon_nb); 267 if (ret) { 268 dev_err(&pdev->dev, "failed to register extcon notifier\n"); 269 return ret; 270 } 271 } 272 273 return 0; 274 } 275 276 static const struct platform_device_id max8997_battery_id[] = { 277 { "max8997-battery", 0 }, 278 { } 279 }; 280 MODULE_DEVICE_TABLE(platform, max8997_battery_id); 281 282 static struct platform_driver max8997_battery_driver = { 283 .driver = { 284 .name = "max8997-battery", 285 }, 286 .probe = max8997_battery_probe, 287 .id_table = max8997_battery_id, 288 }; 289 module_platform_driver(max8997_battery_driver); 290 291 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver"); 292 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); 293 MODULE_LICENSE("GPL"); 294