drivers/power/supply/max8997_charger.c

   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, &reg);
  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, &reg);
  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, &reg);
  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(charger->edev)) {
 252                 dev_err_probe(charger->dev, PTR_ERR(charger->edev),
 253                               "couldn't get extcon device: max8997-muic\n");
 254                 return PTR_ERR(charger->edev);
 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");