drivers/power/supply/pm8916_lbc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2023, Nikita Travkin <nikita@trvn.ru>
   4  */
   5
   6 #include <linux/errno.h>
   7 #include <linux/module.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/power_supply.h>
  10 #include <linux/property.h>
  11 #include <linux/regmap.h>
  12 #include <linux/slab.h>
  13 #include <linux/delay.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/extcon-provider.h>
  16 #include <linux/mod_devicetable.h>
  17
  18 /* Two bytes: type + subtype */
  19 #define PM8916_PERPH_TYPE 0x04
  20 #define PM8916_LBC_CHGR_TYPE 0x1502
  21 #define PM8916_LBC_BAT_IF_TYPE 0x1602
  22 #define PM8916_LBC_USB_TYPE 0x1702
  23 #define PM8916_LBC_MISC_TYPE 0x1802
  24
  25 #define PM8916_LBC_CHGR_CHG_OPTION 0x08
  26 #define PM8916_LBC_CHGR_PMIC_CHARGER BIT(7)
  27
  28 #define PM8916_LBC_CHGR_CHG_STATUS 0x09
  29
  30 #define PM8916_INT_RT_STS 0x10
  31
  32 #define PM8916_LBC_USB_USBIN_VALID BIT(1)
  33
  34 #define PM8916_LBC_CHGR_VDD_MAX 0x40
  35 #define PM8916_LBC_CHGR_VDD_SAFE 0x41
  36 #define PM8916_LBC_CHGR_IBAT_MAX 0x44
  37 #define PM8916_LBC_CHGR_IBAT_SAFE 0x45
  38
  39 #define PM8916_LBC_CHGR_TCHG_MAX_EN 0x60
  40 #define PM8916_LBC_CHGR_TCHG_MAX_ENABLED BIT(7)
  41 #define PM8916_LBC_CHGR_TCHG_MAX 0x61
  42
  43 #define PM8916_LBC_CHGR_CHG_CTRL 0x49
  44 #define PM8916_LBC_CHGR_CHG_EN BIT(7)
  45 #define PM8916_LBC_CHGR_PSTG_EN BIT(5)
  46
  47 #define PM8916_LBC_CHGR_MIN_CURRENT 90000
  48 #define PM8916_LBC_CHGR_MAX_CURRENT 1440000
  49
  50 #define PM8916_LBC_CHGR_MIN_VOLTAGE 4000000
  51 #define PM8916_LBC_CHGR_MAX_VOLTAGE 4775000
  52 #define PM8916_LBC_CHGR_VOLTAGE_STEP 25000
  53
  54 #define PM8916_LBC_CHGR_MIN_TIME 4
  55 #define PM8916_LBC_CHGR_MAX_TIME 256
  56
  57 struct pm8916_lbc_charger {
  58         struct device *dev;
  59         struct extcon_dev *edev;
  60         struct power_supply *charger;
  61         struct power_supply_battery_info *info;
  62         struct regmap *regmap;
  63         unsigned int reg[4];
  64         bool online;
  65         unsigned int charge_voltage_max;
  66         unsigned int charge_voltage_safe;
  67         unsigned int charge_current_max;
  68         unsigned int charge_current_safe;
  69 };
  70
  71 static const unsigned int pm8916_lbc_charger_cable[] = {
  72         EXTCON_USB,
  73         EXTCON_NONE,
  74 };
  75
  76 enum {
  77         LBC_CHGR = 0,
  78         LBC_BAT_IF,
  79         LBC_USB,
  80         LBC_MISC,
  81 };
  82
  83 static int pm8916_lbc_charger_configure(struct pm8916_lbc_charger *chg)
  84 {
  85         int ret = 0;
  86         unsigned int tmp;
  87
  88         chg->charge_voltage_max = clamp_t(u32, chg->charge_voltage_max,
  89                                           PM8916_LBC_CHGR_MIN_VOLTAGE, chg->charge_voltage_safe);
  90
  91         tmp = chg->charge_voltage_max - PM8916_LBC_CHGR_MIN_VOLTAGE;
  92         tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP;
  93         chg->charge_voltage_max = PM8916_LBC_CHGR_MIN_VOLTAGE + tmp * PM8916_LBC_CHGR_VOLTAGE_STEP;
  94
  95         ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_MAX, tmp);
  96         if (ret)
  97                 goto error;
  98
  99         chg->charge_current_max = min(chg->charge_current_max, chg->charge_current_safe);
 100
 101         tmp = clamp_t(u32, chg->charge_current_max,
 102                       PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT);
 103
 104         tmp = chg->charge_current_max / PM8916_LBC_CHGR_MIN_CURRENT - 1;
 105         chg->charge_current_max = (tmp + 1) * PM8916_LBC_CHGR_MIN_CURRENT;
 106
 107         ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_MAX, tmp);
 108         if (ret)
 109                 goto error;
 110
 111         ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_CTRL,
 112                            PM8916_LBC_CHGR_CHG_EN | PM8916_LBC_CHGR_PSTG_EN);
 113         if (ret)
 114                 goto error;
 115
 116         return ret;
 117
 118 error:
 119         dev_err(chg->dev, "Failed to configure charging: %pe\n", ERR_PTR(ret));
 120         return ret;
 121 }
 122
 123 static int pm8916_lbc_charger_get_property(struct power_supply *psy,
 124                                            enum power_supply_property psp,
 125                                            union power_supply_propval *val)
 126 {
 127         struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy);
 128
 129         switch (psp) {
 130         case POWER_SUPPLY_PROP_ONLINE:
 131                 val->intval = chg->online;
 132                 return 0;
 133
 134         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 135                 val->intval = chg->charge_voltage_max;
 136                 return 0;
 137
 138         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 139                 val->intval = chg->charge_current_max;
 140                 return 0;
 141
 142         default:
 143                 return -EINVAL;
 144         };
 145 }
 146
 147 static int pm8916_lbc_charger_set_property(struct power_supply *psy,
 148                                            enum power_supply_property prop,
 149                                            const union power_supply_propval *val)
 150 {
 151         struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy);
 152
 153         switch (prop) {
 154         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 155                 chg->charge_current_max = val->intval;
 156                 return pm8916_lbc_charger_configure(chg);
 157         default:
 158                 return -EINVAL;
 159         }
 160 }
 161
 162 static int pm8916_lbc_charger_property_is_writeable(struct power_supply *psy,
 163                                                     enum power_supply_property psp)
 164 {
 165         switch (psp) {
 166         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 167                 return true;
 168         default:
 169                 return false;
 170         }
 171 }
 172
 173 static enum power_supply_property pm8916_lbc_charger_properties[] = {
 174         POWER_SUPPLY_PROP_ONLINE,
 175         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 176         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 177 };
 178
 179 static irqreturn_t pm8916_lbc_charger_state_changed_irq(int irq, void *data)
 180 {
 181         struct pm8916_lbc_charger *chg = data;
 182         unsigned int tmp;
 183         int ret;
 184
 185         ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
 186         if (ret)
 187                 return IRQ_HANDLED;
 188
 189         chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID);
 190         extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online);
 191
 192         power_supply_changed(chg->charger);
 193
 194         return IRQ_HANDLED;
 195 }
 196
 197 static int pm8916_lbc_charger_probe_dt(struct pm8916_lbc_charger *chg)
 198 {
 199         struct device *dev = chg->dev;
 200         int ret = 0;
 201         unsigned int tmp;
 202
 203         ret = device_property_read_u32(dev, "qcom,fast-charge-safe-voltage", &chg->charge_voltage_safe);
 204         if (ret)
 205                 return ret;
 206         if (chg->charge_voltage_safe < PM8916_LBC_CHGR_MIN_VOLTAGE)
 207                 return -EINVAL;
 208
 209         chg->charge_voltage_safe = clamp_t(u32, chg->charge_voltage_safe,
 210                                         PM8916_LBC_CHGR_MIN_VOLTAGE, PM8916_LBC_CHGR_MAX_VOLTAGE);
 211
 212         tmp = chg->charge_voltage_safe - PM8916_LBC_CHGR_MIN_VOLTAGE;
 213         tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP;
 214         ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_SAFE, tmp);
 215         if (ret)
 216                 return ret;
 217
 218         ret = device_property_read_u32(dev, "qcom,fast-charge-safe-current", &chg->charge_current_safe);
 219         if (ret)
 220                 return ret;
 221         if (chg->charge_current_safe < PM8916_LBC_CHGR_MIN_CURRENT)
 222                 return -EINVAL;
 223
 224         chg->charge_current_safe = clamp_t(u32, chg->charge_current_safe,
 225                                         PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT);
 226
 227         chg->charge_current_max = chg->charge_current_safe;
 228
 229         tmp = chg->charge_current_safe / PM8916_LBC_CHGR_MIN_CURRENT - 1;
 230         ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_SAFE, tmp);
 231         if (ret)
 232                 return ret;
 233
 234         /* Disable charger timeout. */
 235         ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_TCHG_MAX_EN, 0x00);
 236         if (ret)
 237                 return ret;
 238
 239         return ret;
 240 }
 241
 242 static const struct power_supply_desc pm8916_lbc_charger_psy_desc = {
 243         .name = "pm8916-lbc-chgr",
 244         .type = POWER_SUPPLY_TYPE_USB,
 245         .properties = pm8916_lbc_charger_properties,
 246         .num_properties = ARRAY_SIZE(pm8916_lbc_charger_properties),
 247         .get_property = pm8916_lbc_charger_get_property,
 248         .set_property = pm8916_lbc_charger_set_property,
 249         .property_is_writeable = pm8916_lbc_charger_property_is_writeable,
 250 };
 251
 252 static int pm8916_lbc_charger_probe(struct platform_device *pdev)
 253 {
 254         struct device *dev = &pdev->dev;
 255         struct pm8916_lbc_charger *chg;
 256         struct power_supply_config psy_cfg = {};
 257         int ret, len, irq;
 258         unsigned int tmp;
 259
 260         chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
 261         if (!chg)
 262                 return -ENOMEM;
 263
 264         chg->dev = dev;
 265
 266         chg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 267         if (!chg->regmap)
 268                 return -ENODEV;
 269
 270         len = device_property_count_u32(dev, "reg");
 271         if (len < 0)
 272                 return len;
 273         if (len != 4)
 274                 return dev_err_probe(dev, -EINVAL,
 275                                      "Wrong amount of reg values: %d (4 expected)\n", len);
 276
 277         irq = platform_get_irq_byname(pdev, "usb_vbus");
 278         if (irq < 0)
 279                 return irq;
 280
 281         ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_lbc_charger_state_changed_irq,
 282                                         IRQF_ONESHOT, "pm8916_lbc", chg);
 283         if (ret)
 284                 return ret;
 285
 286         ret = device_property_read_u32_array(dev, "reg", chg->reg, len);
 287         if (ret)
 288                 return ret;
 289
 290         ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_PERPH_TYPE, &tmp, 2);
 291         if (ret)
 292                 goto comm_error;
 293         if (tmp != PM8916_LBC_CHGR_TYPE)
 294                 goto type_error;
 295
 296         ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_BAT_IF] + PM8916_PERPH_TYPE, &tmp, 2);
 297         if (ret)
 298                 goto comm_error;
 299         if (tmp != PM8916_LBC_BAT_IF_TYPE)
 300                 goto type_error;
 301
 302         ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_USB] + PM8916_PERPH_TYPE, &tmp, 2);
 303         if (ret)
 304                 goto comm_error;
 305         if (tmp != PM8916_LBC_USB_TYPE)
 306                 goto type_error;
 307
 308         ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_MISC] + PM8916_PERPH_TYPE, &tmp, 2);
 309         if (ret)
 310                 goto comm_error;
 311         if (tmp != PM8916_LBC_MISC_TYPE)
 312                 goto type_error;
 313
 314         ret = regmap_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_OPTION, &tmp);
 315         if (ret)
 316                 goto comm_error;
 317         if (tmp != PM8916_LBC_CHGR_PMIC_CHARGER)
 318                 dev_err_probe(dev, -ENODEV, "The system is using an external charger\n");
 319
 320         ret = pm8916_lbc_charger_probe_dt(chg);
 321         if (ret)
 322                 dev_err_probe(dev, ret, "Error while parsing device tree\n");
 323
 324         psy_cfg.drv_data = chg;
 325         psy_cfg.of_node = dev->of_node;
 326
 327         chg->charger = devm_power_supply_register(dev, &pm8916_lbc_charger_psy_desc, &psy_cfg);
 328         if (IS_ERR(chg->charger))
 329                 return dev_err_probe(dev, PTR_ERR(chg->charger), "Unable to register charger\n");
 330
 331         ret = power_supply_get_battery_info(chg->charger, &chg->info);
 332         if (ret)
 333                 return dev_err_probe(dev, ret, "Unable to get battery info\n");
 334
 335         chg->edev = devm_extcon_dev_allocate(dev, pm8916_lbc_charger_cable);
 336         if (IS_ERR(chg->edev))
 337                 return PTR_ERR(chg->edev);
 338
 339         ret = devm_extcon_dev_register(dev, chg->edev);
 340         if (ret < 0)
 341                 return dev_err_probe(dev, ret, "failed to register extcon device\n");
 342
 343         ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
 344         if (ret)
 345                 goto comm_error;
 346
 347         chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID);
 348         extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online);
 349
 350         chg->charge_voltage_max = chg->info->voltage_max_design_uv;
 351         ret = pm8916_lbc_charger_configure(chg);
 352         if (ret)
 353                 return ret;
 354
 355         return 0;
 356
 357 comm_error:
 358         return dev_err_probe(dev, ret, "Unable to communicate with device\n");
 359
 360 type_error:
 361         return dev_err_probe(dev, -ENODEV, "Device reported wrong type: 0x%X\n", tmp);
 362 }
 363
 364 static const struct of_device_id pm8916_lbc_charger_of_match[] = {
 365         { .compatible = "qcom,pm8916-lbc", },
 366         {}
 367 };
 368 MODULE_DEVICE_TABLE(of, pm8916_lbc_charger_of_match);
 369
 370 static struct platform_driver pm8916_lbc_charger_driver = {
 371         .driver = {
 372                 .name = "pm8916-lbc",
 373                 .of_match_table = pm8916_lbc_charger_of_match,
 374         },
 375         .probe = pm8916_lbc_charger_probe,
 376 };
 377 module_platform_driver(pm8916_lbc_charger_driver);
 378
 379 MODULE_DESCRIPTION("pm8916 LBC driver");
 380 MODULE_AUTHOR("Nikita Travkin <nikita@trvn.ru>");
 381 MODULE_LICENSE("GPL");