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Diffstat (limited to 'drivers/power/supply/max14577_charger.c')
-rw-r--r--drivers/power/supply/max14577_charger.c648
1 files changed, 648 insertions, 0 deletions
diff --git a/drivers/power/supply/max14577_charger.c b/drivers/power/supply/max14577_charger.c
new file mode 100644
index 000000000..f244cd902
--- /dev/null
+++ b/drivers/power/supply/max14577_charger.c
@@ -0,0 +1,648 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// max14577_charger.c - Battery charger driver for the Maxim 14577/77836
+//
+// Copyright (C) 2013,2014 Samsung Electronics
+// Krzysztof Kozlowski <krzk@kernel.org>
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max14577-private.h>
+#include <linux/mfd/max14577.h>
+
+struct max14577_charger {
+ struct device *dev;
+ struct max14577 *max14577;
+ struct power_supply *charger;
+
+ struct max14577_charger_platform_data *pdata;
+};
+
+/*
+ * Helper function for mapping values of STATUS2/CHGTYP register on max14577
+ * and max77836 chipsets to enum maxim_muic_charger_type.
+ */
+static enum max14577_muic_charger_type maxim_get_charger_type(
+ enum maxim_device_type dev_type, u8 val) {
+ switch (val) {
+ case MAX14577_CHARGER_TYPE_NONE:
+ case MAX14577_CHARGER_TYPE_USB:
+ case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
+ case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
+ case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
+ case MAX14577_CHARGER_TYPE_SPECIAL_1A:
+ return val;
+ case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
+ case MAX14577_CHARGER_TYPE_RESERVED:
+ if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
+ val |= 0x8;
+ return val;
+ default:
+ WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
+ return val;
+ }
+}
+
+static int max14577_get_charger_state(struct max14577_charger *chg, int *val)
+{
+ struct regmap *rmap = chg->max14577->regmap;
+ int ret;
+ u8 reg_data;
+
+ /*
+ * Charging occurs only if:
+ * - CHGCTRL2/MBCHOSTEN == 1
+ * - STATUS2/CGMBC == 1
+ *
+ * TODO:
+ * - handle FULL after Top-off timer (EOC register may be off
+ * and the charger won't be charging although MBCHOSTEN is on)
+ * - handle properly dead-battery charging (respect timer)
+ * - handle timers (fast-charge and prequal) /MBCCHGERR/
+ */
+ ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
+ if (ret < 0)
+ goto out;
+
+ if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) {
+ *val = POWER_SUPPLY_STATUS_DISCHARGING;
+ goto out;
+ }
+
+ ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
+ if (ret < 0)
+ goto out;
+
+ if (reg_data & STATUS3_CGMBC_MASK) {
+ /* Charger or USB-cable is connected */
+ if (reg_data & STATUS3_EOC_MASK)
+ *val = POWER_SUPPLY_STATUS_FULL;
+ else
+ *val = POWER_SUPPLY_STATUS_CHARGING;
+ goto out;
+ }
+
+ *val = POWER_SUPPLY_STATUS_DISCHARGING;
+
+out:
+ return ret;
+}
+
+/*
+ * Supported charge types:
+ * - POWER_SUPPLY_CHARGE_TYPE_NONE
+ * - POWER_SUPPLY_CHARGE_TYPE_FAST
+ */
+static int max14577_get_charge_type(struct max14577_charger *chg, int *val)
+{
+ int ret, charging;
+
+ /*
+ * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
+ * As spec says:
+ * [after reaching EOC interrupt]
+ * "When the battery is fully charged, the 30-minute (typ)
+ * top-off timer starts. The device continues to trickle
+ * charge the battery until the top-off timer runs out."
+ */
+ ret = max14577_get_charger_state(chg, &charging);
+ if (ret < 0)
+ return ret;
+
+ if (charging == POWER_SUPPLY_STATUS_CHARGING)
+ *val = POWER_SUPPLY_CHARGE_TYPE_FAST;
+ else
+ *val = POWER_SUPPLY_CHARGE_TYPE_NONE;
+
+ return 0;
+}
+
+static int max14577_get_online(struct max14577_charger *chg, int *val)
+{
+ struct regmap *rmap = chg->max14577->regmap;
+ u8 reg_data;
+ int ret;
+ enum max14577_muic_charger_type chg_type;
+
+ ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
+ if (ret < 0)
+ return ret;
+
+ reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
+ chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
+ switch (chg_type) {
+ case MAX14577_CHARGER_TYPE_USB:
+ case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
+ case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
+ case MAX14577_CHARGER_TYPE_SPECIAL_1A:
+ case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
+ case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
+ *val = 1;
+ break;
+ case MAX14577_CHARGER_TYPE_NONE:
+ case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
+ case MAX14577_CHARGER_TYPE_RESERVED:
+ case MAX77836_CHARGER_TYPE_RESERVED:
+ default:
+ *val = 0;
+ }
+
+ return 0;
+}
+
+/*
+ * Supported health statuses:
+ * - POWER_SUPPLY_HEALTH_DEAD
+ * - POWER_SUPPLY_HEALTH_OVERVOLTAGE
+ * - POWER_SUPPLY_HEALTH_GOOD
+ */
+static int max14577_get_battery_health(struct max14577_charger *chg, int *val)
+{
+ struct regmap *rmap = chg->max14577->regmap;
+ int ret;
+ u8 reg_data;
+ enum max14577_muic_charger_type chg_type;
+
+ ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, &reg_data);
+ if (ret < 0)
+ goto out;
+
+ reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
+ chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
+ if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
+ *val = POWER_SUPPLY_HEALTH_DEAD;
+ goto out;
+ }
+
+ ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
+ if (ret < 0)
+ goto out;
+
+ if (reg_data & STATUS3_OVP_MASK) {
+ *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ goto out;
+ }
+
+ /* Not dead, not overvoltage */
+ *val = POWER_SUPPLY_HEALTH_GOOD;
+
+out:
+ return ret;
+}
+
+/*
+ * Always returns 1.
+ * The max14577 chip doesn't report any status of battery presence.
+ * Lets assume that it will always be used with some battery.
+ */
+static int max14577_get_present(struct max14577_charger *chg, int *val)
+{
+ *val = 1;
+
+ return 0;
+}
+
+static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
+ unsigned long hours)
+{
+ u8 reg_data;
+
+ switch (hours) {
+ case 5 ... 7:
+ reg_data = hours - 3;
+ break;
+ case 0:
+ /* Disable */
+ reg_data = 0x7;
+ break;
+ default:
+ dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
+ hours);
+ return -EINVAL;
+ }
+ reg_data <<= CHGCTRL1_TCHW_SHIFT;
+
+ return max14577_update_reg(chg->max14577->regmap,
+ MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
+}
+
+static int max14577_init_constant_voltage(struct max14577_charger *chg,
+ unsigned int uvolt)
+{
+ u8 reg_data;
+
+ if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
+ uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
+ return -EINVAL;
+
+ if (uvolt == 4200000)
+ reg_data = 0x0;
+ else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
+ reg_data = 0x1f;
+ else if (uvolt <= 4280000) {
+ unsigned int val = uvolt;
+
+ val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
+ val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
+ if (uvolt <= 4180000)
+ reg_data = 0x1 + val;
+ else
+ reg_data = val; /* Fix for gap between 4.18V and 4.22V */
+ } else
+ return -EINVAL;
+
+ reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
+
+ return max14577_write_reg(chg->max14577->regmap,
+ MAX14577_CHG_REG_CHG_CTRL3, reg_data);
+}
+
+static int max14577_init_eoc(struct max14577_charger *chg,
+ unsigned int uamp)
+{
+ unsigned int current_bits;
+ u8 reg_data;
+
+ switch (chg->max14577->dev_type) {
+ case MAXIM_DEVICE_TYPE_MAX77836:
+ if (uamp < 5000)
+ return -EINVAL; /* Requested current is too low */
+
+ if (uamp >= 7500 && uamp < 10000)
+ current_bits = 0x0;
+ else if (uamp <= 50000) {
+ /* <5000, 7499> and <10000, 50000> */
+ current_bits = uamp / 5000;
+ } else {
+ uamp = min(uamp, 100000U) - 50000U;
+ current_bits = 0xa + uamp / 10000;
+ }
+ break;
+
+ case MAXIM_DEVICE_TYPE_MAX14577:
+ default:
+ if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
+ return -EINVAL; /* Requested current is too low */
+
+ uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
+ uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
+ current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
+ break;
+ }
+
+ reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;
+
+ return max14577_update_reg(chg->max14577->regmap,
+ MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
+ reg_data);
+}
+
+static int max14577_init_fast_charge(struct max14577_charger *chg,
+ unsigned int uamp)
+{
+ u8 reg_data;
+ int ret;
+ const struct maxim_charger_current *limits =
+ &maxim_charger_currents[chg->max14577->dev_type];
+
+ ret = maxim_charger_calc_reg_current(limits, uamp, uamp, &reg_data);
+ if (ret) {
+ dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
+ return ret;
+ }
+
+ return max14577_update_reg(chg->max14577->regmap,
+ MAX14577_CHG_REG_CHG_CTRL4,
+ CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
+ reg_data);
+}
+
+/*
+ * Sets charger registers to proper and safe default values.
+ * Some of these values are equal to defaults in MAX14577E
+ * data sheet but there are minor differences.
+ */
+static int max14577_charger_reg_init(struct max14577_charger *chg)
+{
+ struct regmap *rmap = chg->max14577->regmap;
+ u8 reg_data;
+ int ret;
+
+ /*
+ * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
+ * Charger-Detection Enable, default on (set CHGDETEN to 1)
+ * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
+ */
+ reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
+ max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
+ CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
+ reg_data);
+
+ /*
+ * Wall-Adapter Rapid Charge, default on
+ * Battery-Charger, default on
+ */
+ reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
+ reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
+ max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
+
+ /* Auto Charging Stop, default off */
+ reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
+ max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
+
+ ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
+ if (ret)
+ return ret;
+
+ ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
+ if (ret)
+ return ret;
+
+ ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
+ if (ret)
+ return ret;
+
+ ret = max14577_set_fast_charge_timer(chg,
+ MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
+ if (ret)
+ return ret;
+
+ /* Initialize Overvoltage-Protection Threshold */
+ switch (chg->pdata->ovp_uvolt) {
+ case 7500000:
+ reg_data = 0x0;
+ break;
+ case 6000000:
+ case 6500000:
+ case 7000000:
+ reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
+ break;
+ default:
+ dev_err(chg->dev, "Wrong value for OVP: %u\n",
+ chg->pdata->ovp_uvolt);
+ return -EINVAL;
+ }
+ reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
+ max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
+
+ return 0;
+}
+
+/* Support property from charger */
+static enum power_supply_property max14577_charger_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static const char * const model_names[] = {
+ [MAXIM_DEVICE_TYPE_UNKNOWN] = "MAX14577-like",
+ [MAXIM_DEVICE_TYPE_MAX14577] = "MAX14577",
+ [MAXIM_DEVICE_TYPE_MAX77836] = "MAX77836",
+};
+static const char *manufacturer = "Maxim Integrated";
+
+static int max14577_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct max14577_charger *chg = power_supply_get_drvdata(psy);
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = max14577_get_charger_state(chg, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ ret = max14577_get_charge_type(chg, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = max14577_get_battery_health(chg, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ ret = max14577_get_present(chg, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ ret = max14577_get_online(chg, &val->intval);
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
+ val->strval = model_names[chg->max14577->dev_type];
+ break;
+ case POWER_SUPPLY_PROP_MANUFACTURER:
+ val->strval = manufacturer;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static const struct power_supply_desc max14577_charger_desc = {
+ .name = "max14577-charger",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = max14577_charger_props,
+ .num_properties = ARRAY_SIZE(max14577_charger_props),
+ .get_property = max14577_charger_get_property,
+};
+
+#ifdef CONFIG_OF
+static struct max14577_charger_platform_data *max14577_charger_dt_init(
+ struct platform_device *pdev)
+{
+ struct max14577_charger_platform_data *pdata;
+ struct device_node *np = pdev->dev.of_node;
+ int ret;
+
+ if (!np) {
+ dev_err(&pdev->dev, "No charger OF node\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ ret = of_property_read_u32(np, "maxim,constant-uvolt",
+ &pdata->constant_uvolt);
+ if (ret) {
+ dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
+ &pdata->fast_charge_uamp);
+ if (ret) {
+ dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
+ if (ret) {
+ dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
+ return ERR_PTR(ret);
+ }
+
+ ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
+ if (ret) {
+ dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
+ return ERR_PTR(ret);
+ }
+
+ return pdata;
+}
+#else /* CONFIG_OF */
+static struct max14577_charger_platform_data *max14577_charger_dt_init(
+ struct platform_device *pdev)
+{
+ return NULL;
+}
+#endif /* CONFIG_OF */
+
+static ssize_t show_fast_charge_timer(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct max14577_charger *chg = dev_get_drvdata(dev);
+ u8 reg_data;
+ int ret;
+ unsigned int val;
+
+ ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
+ &reg_data);
+ if (ret)
+ return ret;
+
+ reg_data &= CHGCTRL1_TCHW_MASK;
+ reg_data >>= CHGCTRL1_TCHW_SHIFT;
+ switch (reg_data) {
+ case 0x2 ... 0x4:
+ val = reg_data + 3;
+ break;
+ case 0x7:
+ val = 0;
+ break;
+ default:
+ val = 5;
+ break;
+ }
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+}
+
+static ssize_t store_fast_charge_timer(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct max14577_charger *chg = dev_get_drvdata(dev);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ ret = max14577_set_fast_charge_timer(chg, val);
+ if (ret)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
+ show_fast_charge_timer, store_fast_charge_timer);
+
+static int max14577_charger_probe(struct platform_device *pdev)
+{
+ struct max14577_charger *chg;
+ struct power_supply_config psy_cfg = {};
+ struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
+ int ret;
+
+ chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
+ if (!chg)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, chg);
+ chg->dev = &pdev->dev;
+ chg->max14577 = max14577;
+
+ chg->pdata = max14577_charger_dt_init(pdev);
+ if (IS_ERR_OR_NULL(chg->pdata))
+ return PTR_ERR(chg->pdata);
+
+ ret = max14577_charger_reg_init(chg);
+ if (ret)
+ return ret;
+
+ ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
+ if (ret) {
+ dev_err(&pdev->dev, "failed: create sysfs entry\n");
+ return ret;
+ }
+
+ psy_cfg.drv_data = chg;
+ chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc,
+ &psy_cfg);
+ if (IS_ERR(chg->charger)) {
+ dev_err(&pdev->dev, "failed: power supply register\n");
+ ret = PTR_ERR(chg->charger);
+ goto err;
+ }
+
+ /* Check for valid values for charger */
+ BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
+ MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
+ MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
+ return 0;
+
+err:
+ device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
+
+ return ret;
+}
+
+static int max14577_charger_remove(struct platform_device *pdev)
+{
+ struct max14577_charger *chg = platform_get_drvdata(pdev);
+
+ device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
+ power_supply_unregister(chg->charger);
+
+ return 0;
+}
+
+static const struct platform_device_id max14577_charger_id[] = {
+ { "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
+ { "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, max14577_charger_id);
+
+static const struct of_device_id of_max14577_charger_dt_match[] = {
+ { .compatible = "maxim,max14577-charger",
+ .data = (void *)MAXIM_DEVICE_TYPE_MAX14577, },
+ { .compatible = "maxim,max77836-charger",
+ .data = (void *)MAXIM_DEVICE_TYPE_MAX77836, },
+ { },
+};
+MODULE_DEVICE_TABLE(of, of_max14577_charger_dt_match);
+
+static struct platform_driver max14577_charger_driver = {
+ .driver = {
+ .name = "max14577-charger",
+ .of_match_table = of_max14577_charger_dt_match,
+ },
+ .probe = max14577_charger_probe,
+ .remove = max14577_charger_remove,
+ .id_table = max14577_charger_id,
+};
+module_platform_driver(max14577_charger_driver);
+
+MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
+MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
+MODULE_LICENSE("GPL");