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