[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / lp8788-charger.c

/*
 * TI LP8788 MFD - battery charger driver
 *
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/err.h>
#include <linux/iio/consumer.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/mfd/lp8788.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

/* register address */
#define LP8788_CHG_STATUS		0x07
#define LP8788_CHG_IDCIN		0x13
#define LP8788_CHG_IBATT		0x14
#define LP8788_CHG_VTERM		0x15
#define LP8788_CHG_EOC			0x16

/* mask/shift bits */
#define LP8788_CHG_INPUT_STATE_M	0x03	/* Addr 07h */
#define LP8788_CHG_STATE_M		0x3C
#define LP8788_CHG_STATE_S		2
#define LP8788_NO_BATT_M		BIT(6)
#define LP8788_BAD_BATT_M		BIT(7)
#define LP8788_CHG_IBATT_M		0x1F	/* Addr 14h */
#define LP8788_CHG_VTERM_M		0x0F	/* Addr 15h */
#define LP8788_CHG_EOC_LEVEL_M		0x30	/* Addr 16h */
#define LP8788_CHG_EOC_LEVEL_S		4
#define LP8788_CHG_EOC_TIME_M		0x0E
#define LP8788_CHG_EOC_TIME_S		1
#define LP8788_CHG_EOC_MODE_M		BIT(0)

#define LP8788_CHARGER_NAME		"charger"
#define LP8788_BATTERY_NAME		"main_batt"

#define LP8788_CHG_START		0x11
#define LP8788_CHG_END			0x1C

#define LP8788_BUF_SIZE			40
#define LP8788_ISEL_MAX			23
#define LP8788_ISEL_STEP		50
#define LP8788_VTERM_MIN		4100
#define LP8788_VTERM_STEP		25
#define LP8788_MAX_BATT_CAPACITY	100
#define LP8788_MAX_CHG_IRQS		11

enum lp8788_charging_state {
	LP8788_OFF,
	LP8788_WARM_UP,
	LP8788_LOW_INPUT = 0x3,
	LP8788_PRECHARGE,
	LP8788_CC,
	LP8788_CV,
	LP8788_MAINTENANCE,
	LP8788_BATTERY_FAULT,
	LP8788_SYSTEM_SUPPORT = 0xC,
	LP8788_HIGH_CURRENT = 0xF,
	LP8788_MAX_CHG_STATE,
};

enum lp8788_charger_adc_sel {
	LP8788_VBATT,
	LP8788_BATT_TEMP,
	LP8788_NUM_CHG_ADC,
};

enum lp8788_charger_input_state {
	LP8788_SYSTEM_SUPPLY = 1,
	LP8788_FULL_FUNCTION,
};

/*
 * struct lp8788_chg_irq
 * @which        : lp8788 interrupt id
 * @virq         : Linux IRQ number from irq_domain
 */
struct lp8788_chg_irq {
	enum lp8788_int_id which;
	int virq;
};

/*
 * struct lp8788_charger
 * @lp           : used for accessing the registers of mfd lp8788 device
 * @charger      : power supply driver for the battery charger
 * @battery      : power supply driver for the battery
 * @charger_work : work queue for charger input interrupts
 * @chan         : iio channels for getting adc values
 *                 eg) battery voltage, capacity and temperature
 * @irqs         : charger dedicated interrupts
 * @num_irqs     : total numbers of charger interrupts
 * @pdata        : charger platform specific data
 */
struct lp8788_charger {
	struct lp8788 *lp;
	struct power_supply charger;
	struct power_supply battery;
	struct work_struct charger_work;
	struct iio_channel *chan[LP8788_NUM_CHG_ADC];
	struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
	int num_irqs;
	struct lp8788_charger_platform_data *pdata;
};

static char *battery_supplied_to[] = {
	LP8788_BATTERY_NAME,
};

static enum power_supply_property lp8788_charger_prop[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_CURRENT_MAX,
};

static enum power_supply_property lp8788_battery_prop[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_TEMP,
};

static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
{
	u8 data;

	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	data &= LP8788_CHG_INPUT_STATE_M;

	return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
}

static int lp8788_charger_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
	u8 read;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = lp8788_is_charger_detected(pchg);
		break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
		val->intval = LP8788_ISEL_STEP *
				(min_t(int, read, LP8788_ISEL_MAX) + 1);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int lp8788_get_battery_status(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	enum lp8788_charging_state state;
	u8 data;
	int ret;

	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	if (ret)
		return ret;

	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
	switch (state) {
	case LP8788_OFF:
		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	case LP8788_PRECHARGE:
	case LP8788_CC:
	case LP8788_CV:
	case LP8788_HIGH_CURRENT:
		val->intval = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case LP8788_MAINTENANCE:
		val->intval = POWER_SUPPLY_STATUS_FULL;
		break;
	default:
		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	}

	return 0;
}

static int lp8788_get_battery_health(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	u8 data;
	int ret;

	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	if (ret)
		return ret;

	if (data & LP8788_NO_BATT_M)
		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
	else if (data & LP8788_BAD_BATT_M)
		val->intval = POWER_SUPPLY_HEALTH_DEAD;
	else
		val->intval = POWER_SUPPLY_HEALTH_GOOD;

	return 0;
}

static int lp8788_get_battery_present(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	u8 data;
	int ret;

	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	if (ret)
		return ret;

	val->intval = !(data & LP8788_NO_BATT_M);
	return 0;
}

static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
{
	struct iio_channel *channel = pchg->chan[LP8788_VBATT];

	if (!channel)
		return -EINVAL;

	return iio_read_channel_processed(channel, result);
}

static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	return lp8788_get_vbatt_adc(pchg, &val->intval);
}

static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	struct lp8788 *lp = pchg->lp;
	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	unsigned int max_vbatt;
	int vbatt;
	enum lp8788_charging_state state;
	u8 data;
	int ret;

	if (!pdata)
		return -EINVAL;

	max_vbatt = pdata->max_vbatt_mv;
	if (max_vbatt == 0)
		return -EINVAL;

	ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
	if (ret)
		return ret;

	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;

	if (state == LP8788_MAINTENANCE) {
		val->intval = LP8788_MAX_BATT_CAPACITY;
	} else {
		ret = lp8788_get_vbatt_adc(pchg, &vbatt);
		if (ret)
			return ret;

		val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
		val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
	}

	return 0;
}

static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
	int result;
	int ret;

	if (!channel)
		return -EINVAL;

	ret = iio_read_channel_processed(channel, &result);
	if (ret < 0)
		return -EINVAL;

	/* unit: 0.1 'C */
	val->intval = result * 10;

	return 0;
}

static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	u8 read;

	lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
	read &= LP8788_CHG_IBATT_M;
	val->intval = LP8788_ISEL_STEP *
			(min_t(int, read, LP8788_ISEL_MAX) + 1);

	return 0;
}

static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	u8 read;

	lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
	read &= LP8788_CHG_VTERM_M;
	val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;

	return 0;
}

static int lp8788_battery_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		return lp8788_get_battery_status(pchg, val);
	case POWER_SUPPLY_PROP_HEALTH:
		return lp8788_get_battery_health(pchg, val);
	case POWER_SUPPLY_PROP_PRESENT:
		return lp8788_get_battery_present(pchg, val);
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		return lp8788_get_battery_voltage(pchg, val);
	case POWER_SUPPLY_PROP_CAPACITY:
		return lp8788_get_battery_capacity(pchg, val);
	case POWER_SUPPLY_PROP_TEMP:
		return lp8788_get_battery_temperature(pchg, val);
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
		return lp8788_get_battery_charging_current(pchg, val);
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
		return lp8788_get_charging_termination_voltage(pchg, val);
	default:
		return -EINVAL;
	}
}

static inline bool lp8788_is_valid_charger_register(u8 addr)
{
	return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
}

static int lp8788_update_charger_params(struct platform_device *pdev,
					struct lp8788_charger *pchg)
{
	struct lp8788 *lp = pchg->lp;
	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	struct lp8788_chg_param *param;
	int i;
	int ret;

	if (!pdata || !pdata->chg_params) {
		dev_info(&pdev->dev, "skip updating charger parameters\n");
		return 0;
	}

	/* settting charging parameters */
	for (i = 0; i < pdata->num_chg_params; i++) {
		param = pdata->chg_params + i;

		if (!param)
			continue;

		if (lp8788_is_valid_charger_register(param->addr)) {
			ret = lp8788_write_byte(lp, param->addr, param->val);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static int lp8788_psy_register(struct platform_device *pdev,
				struct lp8788_charger *pchg)
{
	pchg->charger.name = LP8788_CHARGER_NAME;
	pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
	pchg->charger.properties = lp8788_charger_prop;
	pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
	pchg->charger.get_property = lp8788_charger_get_property;
	pchg->charger.supplied_to = battery_supplied_to;
	pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);

	if (power_supply_register(&pdev->dev, &pchg->charger))
		return -EPERM;

	pchg->battery.name = LP8788_BATTERY_NAME;
	pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	pchg->battery.properties = lp8788_battery_prop;
	pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
	pchg->battery.get_property = lp8788_battery_get_property;

	if (power_supply_register(&pdev->dev, &pchg->battery))
		return -EPERM;

	return 0;
}

static void lp8788_psy_unregister(struct lp8788_charger *pchg)
{
	power_supply_unregister(&pchg->battery);
	power_supply_unregister(&pchg->charger);
}

static void lp8788_charger_event(struct work_struct *work)
{
	struct lp8788_charger *pchg =
		container_of(work, struct lp8788_charger, charger_work);
	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);

	pdata->charger_event(pchg->lp, event);
}

static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
{
	bool found;
	int i;

	for (i = 0; i < pchg->num_irqs; i++) {
		if (pchg->irqs[i].virq == virq) {
			*id = pchg->irqs[i].which;
			found = true;
			break;
		}
	}

	return found;
}

static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
{
	struct lp8788_charger *pchg = ptr;
	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	int id = -1;

	if (!lp8788_find_irq_id(pchg, virq, &id))
		return IRQ_NONE;

	switch (id) {
	case LP8788_INT_CHG_INPUT_STATE:
	case LP8788_INT_CHG_STATE:
	case LP8788_INT_EOC:
	case LP8788_INT_BATT_LOW:
	case LP8788_INT_NO_BATT:
		power_supply_changed(&pchg->charger);
		power_supply_changed(&pchg->battery);
		break;
	default:
		break;
	}

	/* report charger dectection event if used */
	if (!pdata)
		goto irq_handled;

	if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
		schedule_work(&pchg->charger_work);

irq_handled:
	return IRQ_HANDLED;
}

static int lp8788_set_irqs(struct platform_device *pdev,
			struct lp8788_charger *pchg, const char *name)
{
	struct resource *r;
	struct irq_domain *irqdm = pchg->lp->irqdm;
	int irq_start;
	int irq_end;
	int virq;
	int nr_irq;
	int i;
	int ret;

	/* no error even if no irq resource */
	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
	if (!r)
		return 0;

	irq_start = r->start;
	irq_end = r->end;

	for (i = irq_start; i <= irq_end; i++) {
		nr_irq = pchg->num_irqs;

		virq = irq_create_mapping(irqdm, i);
		pchg->irqs[nr_irq].virq = virq;
		pchg->irqs[nr_irq].which = i;
		pchg->num_irqs++;

		ret = request_threaded_irq(virq, NULL,
					lp8788_charger_irq_thread,
					0, name, pchg);
		if (ret)
			break;
	}

	if (i <= irq_end)
		goto err_free_irq;

	return 0;

err_free_irq:
	for (i = 0; i < pchg->num_irqs; i++)
		free_irq(pchg->irqs[i].virq, pchg);
	return ret;
}

static int lp8788_irq_register(struct platform_device *pdev,
				struct lp8788_charger *pchg)
{
	const char *name[] = {
		LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
	};
	int i;
	int ret;

	INIT_WORK(&pchg->charger_work, lp8788_charger_event);
	pchg->num_irqs = 0;

	for (i = 0; i < ARRAY_SIZE(name); i++) {
		ret = lp8788_set_irqs(pdev, pchg, name[i]);
		if (ret) {
			dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
			return ret;
		}
	}

	if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
		dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
			pchg->num_irqs);
		return -EINVAL;
	}


	return 0;
}

static void lp8788_irq_unregister(struct platform_device *pdev,
				  struct lp8788_charger *pchg)
{
	int i;
	int irq;

	for (i = 0; i < pchg->num_irqs; i++) {
		irq = pchg->irqs[i].virq;
		if (!irq)
			continue;

		free_irq(irq, pchg);
	}
}

static void lp8788_setup_adc_channel(struct device *dev,
				struct lp8788_charger *pchg)
{
	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	struct iio_channel *chan;

	if (!pdata)
		return;

	/* ADC channel for battery voltage */
	chan = iio_channel_get(dev, pdata->adc_vbatt);
	pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;

	/* ADC channel for battery temperature */
	chan = iio_channel_get(dev, pdata->adc_batt_temp);
	pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
}

static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
{
	int i;

	for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
		if (!pchg->chan[i])
			continue;

		iio_channel_release(pchg->chan[i]);
		pchg->chan[i] = NULL;
	}
}

static ssize_t lp8788_show_charger_status(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	enum lp8788_charging_state state;
	char *desc[LP8788_MAX_CHG_STATE] = {
		[LP8788_OFF] = "CHARGER OFF",
		[LP8788_WARM_UP] = "WARM UP",
		[LP8788_LOW_INPUT] = "LOW INPUT STATE",
		[LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
		[LP8788_CC] = "CHARGING - CC",
		[LP8788_CV] = "CHARGING - CV",
		[LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
		[LP8788_BATTERY_FAULT] = "BATTERY FAULT",
		[LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
		[LP8788_HIGH_CURRENT] = "HIGH CURRENT",
	};
	u8 data;

	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;

	return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
}

static ssize_t lp8788_show_eoc_time(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	char *stime[] = { "400ms", "5min", "10min", "15min",
			"20min", "25min", "30min" "No timeout" };
	u8 val;

	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
	val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;

	return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
			stime[val]);
}

static ssize_t lp8788_show_eoc_level(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
	char *relative_level[] = { "5%", "10%", "15%", "20%" };
	char *level;
	u8 val;
	u8 mode;

	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);

	mode = val & LP8788_CHG_EOC_MODE_M;
	val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
	level = mode ? abs_level[val] : relative_level[val];

	return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
			level);
}

static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);

static struct attribute *lp8788_charger_attr[] = {
	&dev_attr_charger_status.attr,
	&dev_attr_eoc_time.attr,
	&dev_attr_eoc_level.attr,
	NULL,
};

static const struct attribute_group lp8788_attr_group = {
	.attrs = lp8788_charger_attr,
};

static int lp8788_charger_probe(struct platform_device *pdev)
{
	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
	struct lp8788_charger *pchg;
	struct device *dev = &pdev->dev;
	int ret;

	pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
	if (!pchg)
		return -ENOMEM;

	pchg->lp = lp;
	pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
	platform_set_drvdata(pdev, pchg);

	ret = lp8788_update_charger_params(pdev, pchg);
	if (ret)
		return ret;

	lp8788_setup_adc_channel(&pdev->dev, pchg);

	ret = lp8788_psy_register(pdev, pchg);
	if (ret)
		return ret;

	ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
	if (ret) {
		lp8788_psy_unregister(pchg);
		return ret;
	}

	ret = lp8788_irq_register(pdev, pchg);
	if (ret)
		dev_warn(dev, "failed to register charger irq: %d\n", ret);

	return 0;
}

static int lp8788_charger_remove(struct platform_device *pdev)
{
	struct lp8788_charger *pchg = platform_get_drvdata(pdev);

	flush_work(&pchg->charger_work);
	lp8788_irq_unregister(pdev, pchg);
	sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
	lp8788_psy_unregister(pchg);
	lp8788_release_adc_channel(pchg);

	return 0;
}

static struct platform_driver lp8788_charger_driver = {
	.probe = lp8788_charger_probe,
	.remove = lp8788_charger_remove,
	.driver = {
		.name = LP8788_DEV_CHARGER,
		.owner = THIS_MODULE,
	},
};
module_platform_driver(lp8788_charger_driver);

MODULE_DESCRIPTION("TI LP8788 Charger Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:lp8788-charger");
Commit	Line	Data
98a27664 KM	1	/*
	2	* TI LP8788 MFD - battery charger driver
	3	*
	4	* Copyright 2012 Texas Instruments
	5	*
	6	* Author: Milo(Woogyom) Kim <milo.kim@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/err.h>
	15	#include <linux/iio/consumer.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/irqdomain.h>
	18	#include <linux/mfd/lp8788.h>
	19	#include <linux/module.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/power_supply.h>
	22	#include <linux/slab.h>
	23	#include <linux/workqueue.h>
	24
	25	/* register address */
	26	#define LP8788_CHG_STATUS 0x07
	27	#define LP8788_CHG_IDCIN 0x13
	28	#define LP8788_CHG_IBATT 0x14
	29	#define LP8788_CHG_VTERM 0x15
	30	#define LP8788_CHG_EOC 0x16
	31
	32	/* mask/shift bits */
	33	#define LP8788_CHG_INPUT_STATE_M 0x03 /* Addr 07h */
	34	#define LP8788_CHG_STATE_M 0x3C
	35	#define LP8788_CHG_STATE_S 2
	36	#define LP8788_NO_BATT_M BIT(6)
	37	#define LP8788_BAD_BATT_M BIT(7)
	38	#define LP8788_CHG_IBATT_M 0x1F /* Addr 14h */
	39	#define LP8788_CHG_VTERM_M 0x0F /* Addr 15h */
	40	#define LP8788_CHG_EOC_LEVEL_M 0x30 /* Addr 16h */
	41	#define LP8788_CHG_EOC_LEVEL_S 4
	42	#define LP8788_CHG_EOC_TIME_M 0x0E
	43	#define LP8788_CHG_EOC_TIME_S 1
	44	#define LP8788_CHG_EOC_MODE_M BIT(0)
	45
	46	#define LP8788_CHARGER_NAME "charger"
	47	#define LP8788_BATTERY_NAME "main_batt"
	48
	49	#define LP8788_CHG_START 0x11
	50	#define LP8788_CHG_END 0x1C
	51
	52	#define LP8788_BUF_SIZE 40
	53	#define LP8788_ISEL_MAX 23
	54	#define LP8788_ISEL_STEP 50
	55	#define LP8788_VTERM_MIN 4100
	56	#define LP8788_VTERM_STEP 25
	57	#define LP8788_MAX_BATT_CAPACITY 100
	58	#define LP8788_MAX_CHG_IRQS 11
	59
	60	enum lp8788_charging_state {
	61	LP8788_OFF,
	62	LP8788_WARM_UP,
	63	LP8788_LOW_INPUT = 0x3,
	64	LP8788_PRECHARGE,
65	LP8788_CC,
66	LP8788_CV,
67	LP8788_MAINTENANCE,
68	LP8788_BATTERY_FAULT,
69	LP8788_SYSTEM_SUPPORT = 0xC,
70	LP8788_HIGH_CURRENT = 0xF,
71	LP8788_MAX_CHG_STATE,
72	};
73
74	enum lp8788_charger_adc_sel {
75	LP8788_VBATT,
76	LP8788_BATT_TEMP,
77	LP8788_NUM_CHG_ADC,
78	};
79
80	enum lp8788_charger_input_state {
81	LP8788_SYSTEM_SUPPLY = 1,
82	LP8788_FULL_FUNCTION,
83	};
84
85	/*
86	* struct lp8788_chg_irq
87	* @which : lp8788 interrupt id
88	* @virq : Linux IRQ number from irq_domain
89	*/
90	struct lp8788_chg_irq {
91	enum lp8788_int_id which;
92	int virq;
93	};
94
95	/*
96	* struct lp8788_charger
97	* @lp : used for accessing the registers of mfd lp8788 device
98	* @charger : power supply driver for the battery charger
99	* @battery : power supply driver for the battery
100	* @charger_work : work queue for charger input interrupts
101	* @chan : iio channels for getting adc values
102	* eg) battery voltage, capacity and temperature
103	* @irqs : charger dedicated interrupts
104	* @num_irqs : total numbers of charger interrupts
105	* @pdata : charger platform specific data
106	*/
107	struct lp8788_charger {
108	struct lp8788 *lp;
109	struct power_supply charger;
110	struct power_supply battery;
111	struct work_struct charger_work;
112	struct iio_channel *chan[LP8788_NUM_CHG_ADC];
113	struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
114	int num_irqs;
115	struct lp8788_charger_platform_data *pdata;
116	};
117
118	static char *battery_supplied_to[] = {
119	LP8788_BATTERY_NAME,
120	};
121
122	static enum power_supply_property lp8788_charger_prop[] = {
123	POWER_SUPPLY_PROP_ONLINE,
124	POWER_SUPPLY_PROP_CURRENT_MAX,
125	};
126
127	static enum power_supply_property lp8788_battery_prop[] = {
128	POWER_SUPPLY_PROP_STATUS,
129	POWER_SUPPLY_PROP_HEALTH,
130	POWER_SUPPLY_PROP_PRESENT,
131	POWER_SUPPLY_PROP_VOLTAGE_NOW,
132	POWER_SUPPLY_PROP_CAPACITY,
133	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
134	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
135	POWER_SUPPLY_PROP_TEMP,
136	};
137
138	static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
139	{
140	u8 data;
141
142	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
143	data &= LP8788_CHG_INPUT_STATE_M;
144
145	return data == LP8788_SYSTEM_SUPPLY \|\| data == LP8788_FULL_FUNCTION;
146	}
147
148	static int lp8788_charger_get_property(struct power_supply *psy,
149	enum power_supply_property psp,
150	union power_supply_propval *val)
151	{
152	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
153	u8 read;
154
155	switch (psp) {
156	case POWER_SUPPLY_PROP_ONLINE:
157	val->intval = lp8788_is_charger_detected(pchg);
158	break;
159	case POWER_SUPPLY_PROP_CURRENT_MAX:
160	lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
161	val->intval = LP8788_ISEL_STEP *
162	(min_t(int, read, LP8788_ISEL_MAX) + 1);
163	break;
164	default:
165	return -EINVAL;
166	}
167
168	return 0;
169	}
170
171	static int lp8788_get_battery_status(struct lp8788_charger *pchg,
172	union power_supply_propval *val)
173	{
174	enum lp8788_charging_state state;
175	u8 data;
176	int ret;
177
178	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
179	if (ret)
180	return ret;
181
182	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
183	switch (state) {
184	case LP8788_OFF:
185	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
186	break;
187	case LP8788_PRECHARGE:
188	case LP8788_CC:
189	case LP8788_CV:
190	case LP8788_HIGH_CURRENT:
191	val->intval = POWER_SUPPLY_STATUS_CHARGING;
192	break;
193	case LP8788_MAINTENANCE:
194	val->intval = POWER_SUPPLY_STATUS_FULL;
195	break;
196	default:
197	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
198	break;
199	}
200
201	return 0;
202	}
203
204	static int lp8788_get_battery_health(struct lp8788_charger *pchg,
205	union power_supply_propval *val)
206	{
207	u8 data;
208	int ret;
209
210	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
211	if (ret)
212	return ret;
213
214	if (data & LP8788_NO_BATT_M)
215	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
216	else if (data & LP8788_BAD_BATT_M)
217	val->intval = POWER_SUPPLY_HEALTH_DEAD;
218	else
219	val->intval = POWER_SUPPLY_HEALTH_GOOD;
220
221	return 0;
222	}
223
224	static int lp8788_get_battery_present(struct lp8788_charger *pchg,
225	union power_supply_propval *val)
226	{
227	u8 data;
228	int ret;
229
230	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
231	if (ret)
232	return ret;
233
234	val->intval = !(data & LP8788_NO_BATT_M);
235	return 0;
236	}
237
340968de	238	static int lp8788_get_vbatt_adc(struct lp8788_charger pchg, int result)
98a27664 KM	239	{
98a27664 KM	240	struct iio_channel *channel = pchg->chan[LP8788_VBATT];
98a27664 KM	241
	242	if (!channel)
	243	return -EINVAL;
	244
340968de	245	return iio_read_channel_processed(channel, result);
98a27664 KM	246	}
	247
	248	static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
	249	union power_supply_propval *val)
	250	{
	251	return lp8788_get_vbatt_adc(pchg, &val->intval);
	252	}
	253
	254	static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
	255	union power_supply_propval *val)
	256	{
	257	struct lp8788 *lp = pchg->lp;
	258	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	259	unsigned int max_vbatt;
340968de	260	int vbatt;
98a27664 KM	261	enum lp8788_charging_state state;
	262	u8 data;
	263	int ret;
	264
	265	if (!pdata)
	266	return -EINVAL;
	267
	268	max_vbatt = pdata->max_vbatt_mv;
	269	if (max_vbatt == 0)
	270	return -EINVAL;
	271
	272	ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
	273	if (ret)
	274	return ret;
	275
	276	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
	277
	278	if (state == LP8788_MAINTENANCE) {
	279	val->intval = LP8788_MAX_BATT_CAPACITY;
	280	} else {
	281	ret = lp8788_get_vbatt_adc(pchg, &vbatt);
	282	if (ret)
	283	return ret;
	284
	285	val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
	286	val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
	287	}
	288
	289	return 0;
	290	}
	291
	292	static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
	293	union power_supply_propval *val)
	294	{
	295	struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
340968de	296	int result;
98a27664 KM	297	int ret;
	298
	299	if (!channel)
	300	return -EINVAL;
	301
340968de KM	302	ret = iio_read_channel_processed(channel, &result);
340968de KM	303	if (ret < 0)
98a27664 KM	304	return -EINVAL;
	305
	306	/* unit: 0.1 'C */
340968de	307	val->intval = result * 10;
98a27664 KM	308
	309	return 0;
	310	}
	311
	312	static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
	313	union power_supply_propval *val)
	314	{
	315	u8 read;
	316
	317	lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
	318	read &= LP8788_CHG_IBATT_M;
	319	val->intval = LP8788_ISEL_STEP *
	320	(min_t(int, read, LP8788_ISEL_MAX) + 1);
	321
	322	return 0;
	323	}
	324
	325	static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
	326	union power_supply_propval *val)
	327	{
	328	u8 read;
	329
	330	lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
	331	read &= LP8788_CHG_VTERM_M;
	332	val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
	333
	334	return 0;
	335	}
	336
	337	static int lp8788_battery_get_property(struct power_supply *psy,
	338	enum power_supply_property psp,
	339	union power_supply_propval *val)
	340	{
	341	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
	342
	343	switch (psp) {
	344	case POWER_SUPPLY_PROP_STATUS:
	345	return lp8788_get_battery_status(pchg, val);
	346	case POWER_SUPPLY_PROP_HEALTH:
	347	return lp8788_get_battery_health(pchg, val);
	348	case POWER_SUPPLY_PROP_PRESENT:
	349	return lp8788_get_battery_present(pchg, val);
	350	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	351	return lp8788_get_battery_voltage(pchg, val);
	352	case POWER_SUPPLY_PROP_CAPACITY:
	353	return lp8788_get_battery_capacity(pchg, val);
	354	case POWER_SUPPLY_PROP_TEMP:
	355	return lp8788_get_battery_temperature(pchg, val);
	356	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
	357	return lp8788_get_battery_charging_current(pchg, val);
	358	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
	359	return lp8788_get_charging_termination_voltage(pchg, val);
	360	default:
	361	return -EINVAL;
	362	}
	363	}
	364
	365	static inline bool lp8788_is_valid_charger_register(u8 addr)
	366	{
	367	return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
	368	}
	369
d5c2b14c KM	370	static int lp8788_update_charger_params(struct platform_device *pdev,
d5c2b14c KM	371	struct lp8788_charger *pchg)
98a27664 KM	372	{
	373	struct lp8788 *lp = pchg->lp;
	374	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	375	struct lp8788_chg_param *param;
	376	int i;
	377	int ret;
	378
	379	if (!pdata \|\| !pdata->chg_params) {
d5c2b14c	380	dev_info(&pdev->dev, "skip updating charger parameters\n");
98a27664 KM	381	return 0;
	382	}
	383
	384	/* settting charging parameters */
	385	for (i = 0; i < pdata->num_chg_params; i++) {
	386	param = pdata->chg_params + i;
	387
	388	if (!param)
	389	continue;
	390
	391	if (lp8788_is_valid_charger_register(param->addr)) {
	392	ret = lp8788_write_byte(lp, param->addr, param->val);
	393	if (ret)
	394	return ret;
	395	}
	396	}
	397
	398	return 0;
	399	}
	400
	401	static int lp8788_psy_register(struct platform_device *pdev,
	402	struct lp8788_charger *pchg)
	403	{
	404	pchg->charger.name = LP8788_CHARGER_NAME;
	405	pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
	406	pchg->charger.properties = lp8788_charger_prop;
	407	pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
	408	pchg->charger.get_property = lp8788_charger_get_property;
	409	pchg->charger.supplied_to = battery_supplied_to;
	410	pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
	411
	412	if (power_supply_register(&pdev->dev, &pchg->charger))
	413	return -EPERM;
	414
	415	pchg->battery.name = LP8788_BATTERY_NAME;
	416	pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	417	pchg->battery.properties = lp8788_battery_prop;
	418	pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
	419	pchg->battery.get_property = lp8788_battery_get_property;
	420
	421	if (power_supply_register(&pdev->dev, &pchg->battery))
	422	return -EPERM;
	423
	424	return 0;
	425	}
	426
	427	static void lp8788_psy_unregister(struct lp8788_charger *pchg)
	428	{
	429	power_supply_unregister(&pchg->battery);
	430	power_supply_unregister(&pchg->charger);
	431	}
	432
	433	static void lp8788_charger_event(struct work_struct *work)
	434	{
	435	struct lp8788_charger *pchg =
	436	container_of(work, struct lp8788_charger, charger_work);
	437	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	438	enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
	439
	440	pdata->charger_event(pchg->lp, event);
	441	}
	442
	443	static bool lp8788_find_irq_id(struct lp8788_charger pchg, int virq, int id)
	444	{
445	bool found;
446	int i;
447
448	for (i = 0; i < pchg->num_irqs; i++) {
449	if (pchg->irqs[i].virq == virq) {
450	*id = pchg->irqs[i].which;
451	found = true;
452	break;
453	}
454	}
455
456	return found;
457	}
458
459	static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
460	{
461	struct lp8788_charger *pchg = ptr;
462	struct lp8788_charger_platform_data *pdata = pchg->pdata;
463	int id = -1;
464
465	if (!lp8788_find_irq_id(pchg, virq, &id))
466	return IRQ_NONE;
467
468	switch (id) {
469	case LP8788_INT_CHG_INPUT_STATE:
470	case LP8788_INT_CHG_STATE:
471	case LP8788_INT_EOC:
472	case LP8788_INT_BATT_LOW:
473	case LP8788_INT_NO_BATT:
474	power_supply_changed(&pchg->charger);
475	power_supply_changed(&pchg->battery);
476	break;
477	default:
478	break;
479	}
480
481	/* report charger dectection event if used */
482	if (!pdata)
483	goto irq_handled;
484
485	if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
486	schedule_work(&pchg->charger_work);
487
488	irq_handled:
489	return IRQ_HANDLED;
490	}
491
492	static int lp8788_set_irqs(struct platform_device *pdev,
493	struct lp8788_charger pchg, const char name)
494	{
495	struct resource *r;
496	struct irq_domain *irqdm = pchg->lp->irqdm;
497	int irq_start;
498	int irq_end;
499	int virq;
500	int nr_irq;
501	int i;
502	int ret;
503
504	/* no error even if no irq resource */
505	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
506	if (!r)
507	return 0;
508
509	irq_start = r->start;
510	irq_end = r->end;
511
512	for (i = irq_start; i <= irq_end; i++) {
513	nr_irq = pchg->num_irqs;
514
515	virq = irq_create_mapping(irqdm, i);
516	pchg->irqs[nr_irq].virq = virq;
517	pchg->irqs[nr_irq].which = i;
518	pchg->num_irqs++;
519
520	ret = request_threaded_irq(virq, NULL,
521	lp8788_charger_irq_thread,
522	0, name, pchg);
523	if (ret)
524	break;
525	}
526
527	if (i <= irq_end)
528	goto err_free_irq;
529
530	return 0;
531
532	err_free_irq:
533	for (i = 0; i < pchg->num_irqs; i++)
534	free_irq(pchg->irqs[i].virq, pchg);
535	return ret;
536	}
537
538	static int lp8788_irq_register(struct platform_device *pdev,
539	struct lp8788_charger *pchg)
540	{
98a27664 KM	541	const char *name[] = {
	542	LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
	543	};
	544	int i;
	545	int ret;
	546
	547	INIT_WORK(&pchg->charger_work, lp8788_charger_event);
	548	pchg->num_irqs = 0;
	549
	550	for (i = 0; i < ARRAY_SIZE(name); i++) {
	551	ret = lp8788_set_irqs(pdev, pchg, name[i]);
	552	if (ret) {
d5c2b14c	553	dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
98a27664 KM	554	return ret;
	555	}
	556	}
	557
	558	if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
d5c2b14c	559	dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
98a27664 KM	560	pchg->num_irqs);
	561	return -EINVAL;
	562	}
	563
	564
	565	return 0;
	566	}
	567
	568	static void lp8788_irq_unregister(struct platform_device *pdev,
	569	struct lp8788_charger *pchg)
	570	{
	571	int i;
	572	int irq;
	573
	574	for (i = 0; i < pchg->num_irqs; i++) {
	575	irq = pchg->irqs[i].virq;
	576	if (!irq)
	577	continue;
	578
	579	free_irq(irq, pchg);
	580	}
	581	}
	582
5aa57f0a	583	static void lp8788_setup_adc_channel(struct device *dev,
968a4783	584	struct lp8788_charger *pchg)
98a27664 KM	585	{
98a27664 KM	586	struct lp8788_charger_platform_data *pdata = pchg->pdata;
98a27664	587	struct iio_channel *chan;
98a27664 KM	588
	589	if (!pdata)
	590	return;
	591
08d816b8	592	/* ADC channel for battery voltage */
5aa57f0a	593	chan = iio_channel_get(dev, pdata->adc_vbatt);
08d816b8	594	pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
98a27664	595
08d816b8	596	/* ADC channel for battery temperature */
5aa57f0a	597	chan = iio_channel_get(dev, pdata->adc_batt_temp);
08d816b8	598	pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
98a27664 KM	599	}
	600
	601	static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
	602	{
	603	int i;
	604
	605	for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
	606	if (!pchg->chan[i])
	607	continue;
	608
	609	iio_channel_release(pchg->chan[i]);
	610	pchg->chan[i] = NULL;
	611	}
	612	}
	613
	614	static ssize_t lp8788_show_charger_status(struct device *dev,
	615	struct device_attribute attr, char buf)
	616	{
	617	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	618	enum lp8788_charging_state state;
	619	char *desc[LP8788_MAX_CHG_STATE] = {
	620	[LP8788_OFF] = "CHARGER OFF",
	621	[LP8788_WARM_UP] = "WARM UP",
	622	[LP8788_LOW_INPUT] = "LOW INPUT STATE",
	623	[LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
	624	[LP8788_CC] = "CHARGING - CC",
	625	[LP8788_CV] = "CHARGING - CV",
	626	[LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
	627	[LP8788_BATTERY_FAULT] = "BATTERY FAULT",
	628	[LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
	629	[LP8788_HIGH_CURRENT] = "HIGH CURRENT",
	630	};
	631	u8 data;
	632
	633	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	634	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
	635
	636	return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
	637	}
	638
	639	static ssize_t lp8788_show_eoc_time(struct device *dev,
	640	struct device_attribute attr, char buf)
	641	{
	642	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	643	char *stime[] = { "400ms", "5min", "10min", "15min",
	644	"20min", "25min", "30min" "No timeout" };
	645	u8 val;
	646
	647	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
	648	val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
	649
	650	return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
	651	stime[val]);
	652	}
	653
	654	static ssize_t lp8788_show_eoc_level(struct device *dev,
	655	struct device_attribute attr, char buf)
	656	{
	657	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	658	char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
	659	char *relative_level[] = { "5%", "10%", "15%", "20%" };
	660	char *level;
	661	u8 val;
	662	u8 mode;
663
664	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
665
666	mode = val & LP8788_CHG_EOC_MODE_M;
667	val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
668	level = mode ? abs_level[val] : relative_level[val];
669
670	return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
671	level);
672	}
673
674	static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
675	static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
676	static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
677
678	static struct attribute *lp8788_charger_attr[] = {
679	&dev_attr_charger_status.attr,
680	&dev_attr_eoc_time.attr,
681	&dev_attr_eoc_level.attr,
682	NULL,
683	};
684
685	static const struct attribute_group lp8788_attr_group = {
686	.attrs = lp8788_charger_attr,
687	};
688
c8afa640	689	static int lp8788_charger_probe(struct platform_device *pdev)
98a27664 KM	690	{
	691	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
	692	struct lp8788_charger *pchg;
05ac539b	693	struct device *dev = &pdev->dev;
98a27664 KM	694	int ret;
98a27664 KM	695
05ac539b	696	pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
98a27664 KM	697	if (!pchg)
	698	return -ENOMEM;
	699
	700	pchg->lp = lp;
	701	pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
	702	platform_set_drvdata(pdev, pchg);
	703
d5c2b14c	704	ret = lp8788_update_charger_params(pdev, pchg);
98a27664 KM	705	if (ret)
	706	return ret;
	707
5aa57f0a	708	lp8788_setup_adc_channel(&pdev->dev, pchg);
98a27664 KM	709
	710	ret = lp8788_psy_register(pdev, pchg);
	711	if (ret)
	712	return ret;
	713
	714	ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
	715	if (ret) {
	716	lp8788_psy_unregister(pchg);
	717	return ret;
	718	}
	719
	720	ret = lp8788_irq_register(pdev, pchg);
	721	if (ret)
05ac539b	722	dev_warn(dev, "failed to register charger irq: %d\n", ret);
98a27664 KM	723
	724	return 0;
	725	}
	726
415ec69f	727	static int lp8788_charger_remove(struct platform_device *pdev)
98a27664 KM	728	{
	729	struct lp8788_charger *pchg = platform_get_drvdata(pdev);
	730
	731	flush_work(&pchg->charger_work);
	732	lp8788_irq_unregister(pdev, pchg);
	733	sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
	734	lp8788_psy_unregister(pchg);
	735	lp8788_release_adc_channel(pchg);
	736
	737	return 0;
	738	}
	739
	740	static struct platform_driver lp8788_charger_driver = {
	741	.probe = lp8788_charger_probe,
28ea73f4	742	.remove = lp8788_charger_remove,
98a27664 KM	743	.driver = {
	744	.name = LP8788_DEV_CHARGER,
	745	.owner = THIS_MODULE,
	746	},
	747	};
	748	module_platform_driver(lp8788_charger_driver);
	749
	750	MODULE_DESCRIPTION("TI LP8788 Charger Driver");
	751	MODULE_AUTHOR("Milo Kim");
	752	MODULE_LICENSE("GPL");
	753	MODULE_ALIAS("platform:lp8788-charger");