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 #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
  33 struct 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
  43 static 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" */
  50 static 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, &reg);
  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, &reg);
  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, &reg);
  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
  98 static 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
 143 static 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
 152 static 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
 160 static 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
 270 static const struct platform_device_id max8997_battery_id[] = {
 271         { "max8997-battery", 0 },
 272         { }
 273 };
 274 MODULE_DEVICE_TABLE(platform, max8997_battery_id);
 275
 276 static 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 };
 283 module_platform_driver(max8997_battery_driver);
 284
 285 MODULE_DESCRIPTION("MAXIM 8997/8966 battery control driver");
 286 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
 287 MODULE_LICENSE("GPL");