[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_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)) {
		power_supply_unregister(&pchg->charger);
		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, PAGE_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, PAGE_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, PAGE_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
98a27664 KM	52	#define LP8788_ISEL_MAX 23
	53	#define LP8788_ISEL_STEP 50
	54	#define LP8788_VTERM_MIN 4100
	55	#define LP8788_VTERM_STEP 25
	56	#define LP8788_MAX_BATT_CAPACITY 100
	57	#define LP8788_MAX_CHG_IRQS 11
	58
	59	enum lp8788_charging_state {
	60	LP8788_OFF,
	61	LP8788_WARM_UP,
	62	LP8788_LOW_INPUT = 0x3,
	63	LP8788_PRECHARGE,
	64	LP8788_CC,
	65	LP8788_CV,
	66	LP8788_MAINTENANCE,
	67	LP8788_BATTERY_FAULT,
	68	LP8788_SYSTEM_SUPPORT = 0xC,
	69	LP8788_HIGH_CURRENT = 0xF,
	70	LP8788_MAX_CHG_STATE,
	71	};
	72
	73	enum lp8788_charger_adc_sel {
	74	LP8788_VBATT,
	75	LP8788_BATT_TEMP,
	76	LP8788_NUM_CHG_ADC,
	77	};
	78
	79	enum lp8788_charger_input_state {
	80	LP8788_SYSTEM_SUPPLY = 1,
	81	LP8788_FULL_FUNCTION,
	82	};
	83
	84	/*
	85	* struct lp8788_chg_irq
	86	* @which : lp8788 interrupt id
	87	* @virq : Linux IRQ number from irq_domain
	88	*/
	89	struct lp8788_chg_irq {
	90	enum lp8788_int_id which;
	91	int virq;
	92	};
	93
	94	/*
	95	* struct lp8788_charger
	96	* @lp : used for accessing the registers of mfd lp8788 device
	97	* @charger : power supply driver for the battery charger
	98	* @battery : power supply driver for the battery
	99	* @charger_work : work queue for charger input interrupts
	100	* @chan : iio channels for getting adc values
	101	* eg) battery voltage, capacity and temperature
	102	* @irqs : charger dedicated interrupts
	103	* @num_irqs : total numbers of charger interrupts
	104	* @pdata : charger platform specific data
	105	*/
	106	struct lp8788_charger {
	107	struct lp8788 *lp;
	108	struct power_supply charger;
	109	struct power_supply battery;
	110	struct work_struct charger_work;
	111	struct iio_channel *chan[LP8788_NUM_CHG_ADC];
	112	struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
	113	int num_irqs;
	114	struct lp8788_charger_platform_data *pdata;
	115	};
116
117	static char *battery_supplied_to[] = {
118	LP8788_BATTERY_NAME,
119	};
120
121	static enum power_supply_property lp8788_charger_prop[] = {
122	POWER_SUPPLY_PROP_ONLINE,
123	POWER_SUPPLY_PROP_CURRENT_MAX,
124	};
125
126	static enum power_supply_property lp8788_battery_prop[] = {
127	POWER_SUPPLY_PROP_STATUS,
128	POWER_SUPPLY_PROP_HEALTH,
129	POWER_SUPPLY_PROP_PRESENT,
130	POWER_SUPPLY_PROP_VOLTAGE_NOW,
131	POWER_SUPPLY_PROP_CAPACITY,
132	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
133	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
134	POWER_SUPPLY_PROP_TEMP,
135	};
136
137	static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
138	{
139	u8 data;
140
141	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
142	data &= LP8788_CHG_INPUT_STATE_M;
143
144	return data == LP8788_SYSTEM_SUPPLY \|\| data == LP8788_FULL_FUNCTION;
145	}
146
147	static int lp8788_charger_get_property(struct power_supply *psy,
148	enum power_supply_property psp,
149	union power_supply_propval *val)
150	{
151	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
152	u8 read;
153
154	switch (psp) {
155	case POWER_SUPPLY_PROP_ONLINE:
156	val->intval = lp8788_is_charger_detected(pchg);
157	break;
158	case POWER_SUPPLY_PROP_CURRENT_MAX:
159	lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
160	val->intval = LP8788_ISEL_STEP *
161	(min_t(int, read, LP8788_ISEL_MAX) + 1);
162	break;
163	default:
164	return -EINVAL;
165	}
166
167	return 0;
168	}
169
170	static int lp8788_get_battery_status(struct lp8788_charger *pchg,
171	union power_supply_propval *val)
172	{
173	enum lp8788_charging_state state;
174	u8 data;
175	int ret;
176
177	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
178	if (ret)
179	return ret;
180
181	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
182	switch (state) {
183	case LP8788_OFF:
184	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
185	break;
186	case LP8788_PRECHARGE:
187	case LP8788_CC:
188	case LP8788_CV:
189	case LP8788_HIGH_CURRENT:
190	val->intval = POWER_SUPPLY_STATUS_CHARGING;
191	break;
192	case LP8788_MAINTENANCE:
193	val->intval = POWER_SUPPLY_STATUS_FULL;
194	break;
195	default:
196	val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
197	break;
198	}
199
200	return 0;
201	}
202
203	static int lp8788_get_battery_health(struct lp8788_charger *pchg,
204	union power_supply_propval *val)
205	{
206	u8 data;
207	int ret;
208
209	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
210	if (ret)
211	return ret;
212
213	if (data & LP8788_NO_BATT_M)
214	val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
215	else if (data & LP8788_BAD_BATT_M)
216	val->intval = POWER_SUPPLY_HEALTH_DEAD;
217	else
218	val->intval = POWER_SUPPLY_HEALTH_GOOD;
219
220	return 0;
221	}
222
223	static int lp8788_get_battery_present(struct lp8788_charger *pchg,
224	union power_supply_propval *val)
225	{
226	u8 data;
227	int ret;
228
229	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
230	if (ret)
231	return ret;
232
233	val->intval = !(data & LP8788_NO_BATT_M);
234	return 0;
235	}
236
340968de	237	static int lp8788_get_vbatt_adc(struct lp8788_charger pchg, int result)
98a27664 KM	238	{
98a27664 KM	239	struct iio_channel *channel = pchg->chan[LP8788_VBATT];
98a27664 KM	240
	241	if (!channel)
	242	return -EINVAL;
	243
340968de	244	return iio_read_channel_processed(channel, result);
98a27664 KM	245	}
	246
	247	static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
	248	union power_supply_propval *val)
	249	{
	250	return lp8788_get_vbatt_adc(pchg, &val->intval);
	251	}
	252
	253	static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
	254	union power_supply_propval *val)
	255	{
	256	struct lp8788 *lp = pchg->lp;
	257	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	258	unsigned int max_vbatt;
340968de	259	int vbatt;
98a27664 KM	260	enum lp8788_charging_state state;
	261	u8 data;
	262	int ret;
	263
	264	if (!pdata)
	265	return -EINVAL;
	266
	267	max_vbatt = pdata->max_vbatt_mv;
	268	if (max_vbatt == 0)
	269	return -EINVAL;
	270
	271	ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
	272	if (ret)
	273	return ret;
	274
	275	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
	276
	277	if (state == LP8788_MAINTENANCE) {
	278	val->intval = LP8788_MAX_BATT_CAPACITY;
	279	} else {
	280	ret = lp8788_get_vbatt_adc(pchg, &vbatt);
	281	if (ret)
	282	return ret;
	283
	284	val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
	285	val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
	286	}
	287
	288	return 0;
	289	}
	290
	291	static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
	292	union power_supply_propval *val)
	293	{
	294	struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
340968de	295	int result;
98a27664 KM	296	int ret;
	297
	298	if (!channel)
	299	return -EINVAL;
	300
340968de KM	301	ret = iio_read_channel_processed(channel, &result);
340968de KM	302	if (ret < 0)
98a27664 KM	303	return -EINVAL;
	304
	305	/* unit: 0.1 'C */
340968de	306	val->intval = result * 10;
98a27664 KM	307
	308	return 0;
	309	}
	310
	311	static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
	312	union power_supply_propval *val)
	313	{
	314	u8 read;
	315
	316	lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
	317	read &= LP8788_CHG_IBATT_M;
	318	val->intval = LP8788_ISEL_STEP *
	319	(min_t(int, read, LP8788_ISEL_MAX) + 1);
	320
	321	return 0;
	322	}
	323
	324	static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
	325	union power_supply_propval *val)
	326	{
	327	u8 read;
	328
	329	lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
	330	read &= LP8788_CHG_VTERM_M;
	331	val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
	332
	333	return 0;
	334	}
	335
	336	static int lp8788_battery_get_property(struct power_supply *psy,
	337	enum power_supply_property psp,
	338	union power_supply_propval *val)
	339	{
	340	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
	341
	342	switch (psp) {
	343	case POWER_SUPPLY_PROP_STATUS:
	344	return lp8788_get_battery_status(pchg, val);
	345	case POWER_SUPPLY_PROP_HEALTH:
	346	return lp8788_get_battery_health(pchg, val);
	347	case POWER_SUPPLY_PROP_PRESENT:
	348	return lp8788_get_battery_present(pchg, val);
	349	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	350	return lp8788_get_battery_voltage(pchg, val);
	351	case POWER_SUPPLY_PROP_CAPACITY:
	352	return lp8788_get_battery_capacity(pchg, val);
	353	case POWER_SUPPLY_PROP_TEMP:
	354	return lp8788_get_battery_temperature(pchg, val);
	355	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
	356	return lp8788_get_battery_charging_current(pchg, val);
	357	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
	358	return lp8788_get_charging_termination_voltage(pchg, val);
	359	default:
	360	return -EINVAL;
	361	}
	362	}
	363
	364	static inline bool lp8788_is_valid_charger_register(u8 addr)
	365	{
	366	return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
	367	}
	368
d5c2b14c KM	369	static int lp8788_update_charger_params(struct platform_device *pdev,
d5c2b14c KM	370	struct lp8788_charger *pchg)
98a27664 KM	371	{
	372	struct lp8788 *lp = pchg->lp;
	373	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	374	struct lp8788_chg_param *param;
	375	int i;
	376	int ret;
	377
	378	if (!pdata \|\| !pdata->chg_params) {
d5c2b14c	379	dev_info(&pdev->dev, "skip updating charger parameters\n");
98a27664 KM	380	return 0;
	381	}
	382
	383	/* settting charging parameters */
	384	for (i = 0; i < pdata->num_chg_params; i++) {
	385	param = pdata->chg_params + i;
	386
	387	if (!param)
	388	continue;
	389
	390	if (lp8788_is_valid_charger_register(param->addr)) {
	391	ret = lp8788_write_byte(lp, param->addr, param->val);
	392	if (ret)
	393	return ret;
	394	}
	395	}
	396
	397	return 0;
	398	}
	399
	400	static int lp8788_psy_register(struct platform_device *pdev,
	401	struct lp8788_charger *pchg)
	402	{
	403	pchg->charger.name = LP8788_CHARGER_NAME;
	404	pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
	405	pchg->charger.properties = lp8788_charger_prop;
	406	pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
	407	pchg->charger.get_property = lp8788_charger_get_property;
	408	pchg->charger.supplied_to = battery_supplied_to;
	409	pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
	410
	411	if (power_supply_register(&pdev->dev, &pchg->charger))
	412	return -EPERM;
	413
	414	pchg->battery.name = LP8788_BATTERY_NAME;
	415	pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
	416	pchg->battery.properties = lp8788_battery_prop;
	417	pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
	418	pchg->battery.get_property = lp8788_battery_get_property;
	419
7aea358e KK	420	if (power_supply_register(&pdev->dev, &pchg->battery)) {
7aea358e KK	421	power_supply_unregister(&pchg->charger);
98a27664	422	return -EPERM;
7aea358e	423	}
98a27664 KM	424
	425	return 0;
	426	}
	427
	428	static void lp8788_psy_unregister(struct lp8788_charger *pchg)
	429	{
	430	power_supply_unregister(&pchg->battery);
	431	power_supply_unregister(&pchg->charger);
	432	}
	433
	434	static void lp8788_charger_event(struct work_struct *work)
	435	{
	436	struct lp8788_charger *pchg =
	437	container_of(work, struct lp8788_charger, charger_work);
	438	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	439	enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
	440
	441	pdata->charger_event(pchg->lp, event);
	442	}
	443
	444	static bool lp8788_find_irq_id(struct lp8788_charger pchg, int virq, int id)
	445	{
	446	bool found;
	447	int i;
	448
	449	for (i = 0; i < pchg->num_irqs; i++) {
	450	if (pchg->irqs[i].virq == virq) {
	451	*id = pchg->irqs[i].which;
	452	found = true;
	453	break;
	454	}
	455	}
	456
	457	return found;
	458	}
	459
	460	static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
	461	{
	462	struct lp8788_charger *pchg = ptr;
	463	struct lp8788_charger_platform_data *pdata = pchg->pdata;
	464	int id = -1;
	465
	466	if (!lp8788_find_irq_id(pchg, virq, &id))
	467	return IRQ_NONE;
	468
	469	switch (id) {
	470	case LP8788_INT_CHG_INPUT_STATE:
	471	case LP8788_INT_CHG_STATE:
	472	case LP8788_INT_EOC:
	473	case LP8788_INT_BATT_LOW:
	474	case LP8788_INT_NO_BATT:
	475	power_supply_changed(&pchg->charger);
	476	power_supply_changed(&pchg->battery);
	477	break;
	478	default:
	479	break;
	480	}
	481
	482	/* report charger dectection event if used */
	483	if (!pdata)
	484	goto irq_handled;
	485
	486	if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
	487	schedule_work(&pchg->charger_work);
488
489	irq_handled:
490	return IRQ_HANDLED;
491	}
492
493	static int lp8788_set_irqs(struct platform_device *pdev,
494	struct lp8788_charger pchg, const char name)
495	{
496	struct resource *r;
497	struct irq_domain *irqdm = pchg->lp->irqdm;
498	int irq_start;
499	int irq_end;
500	int virq;
501	int nr_irq;
502	int i;
503	int ret;
504
505	/* no error even if no irq resource */
506	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
507	if (!r)
508	return 0;
509
510	irq_start = r->start;
511	irq_end = r->end;
512
513	for (i = irq_start; i <= irq_end; i++) {
514	nr_irq = pchg->num_irqs;
515
516	virq = irq_create_mapping(irqdm, i);
517	pchg->irqs[nr_irq].virq = virq;
518	pchg->irqs[nr_irq].which = i;
519	pchg->num_irqs++;
520
521	ret = request_threaded_irq(virq, NULL,
522	lp8788_charger_irq_thread,
523	0, name, pchg);
524	if (ret)
525	break;
526	}
527
528	if (i <= irq_end)
529	goto err_free_irq;
530
531	return 0;
532
533	err_free_irq:
534	for (i = 0; i < pchg->num_irqs; i++)
535	free_irq(pchg->irqs[i].virq, pchg);
536	return ret;
537	}
538
539	static int lp8788_irq_register(struct platform_device *pdev,
540	struct lp8788_charger *pchg)
541	{
98a27664 KM	542	const char *name[] = {
	543	LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
	544	};
	545	int i;
	546	int ret;
	547
	548	INIT_WORK(&pchg->charger_work, lp8788_charger_event);
	549	pchg->num_irqs = 0;
	550
	551	for (i = 0; i < ARRAY_SIZE(name); i++) {
	552	ret = lp8788_set_irqs(pdev, pchg, name[i]);
	553	if (ret) {
d5c2b14c	554	dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
98a27664 KM	555	return ret;
	556	}
	557	}
	558
	559	if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
d5c2b14c	560	dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
98a27664 KM	561	pchg->num_irqs);
	562	return -EINVAL;
	563	}
	564
	565
	566	return 0;
	567	}
	568
	569	static void lp8788_irq_unregister(struct platform_device *pdev,
	570	struct lp8788_charger *pchg)
	571	{
	572	int i;
	573	int irq;
	574
	575	for (i = 0; i < pchg->num_irqs; i++) {
	576	irq = pchg->irqs[i].virq;
	577	if (!irq)
	578	continue;
	579
	580	free_irq(irq, pchg);
	581	}
	582	}
	583
5aa57f0a	584	static void lp8788_setup_adc_channel(struct device *dev,
968a4783	585	struct lp8788_charger *pchg)
98a27664 KM	586	{
98a27664 KM	587	struct lp8788_charger_platform_data *pdata = pchg->pdata;
98a27664	588	struct iio_channel *chan;
98a27664 KM	589
	590	if (!pdata)
	591	return;
	592
08d816b8	593	/* ADC channel for battery voltage */
5aa57f0a	594	chan = iio_channel_get(dev, pdata->adc_vbatt);
08d816b8	595	pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
98a27664	596
08d816b8	597	/* ADC channel for battery temperature */
5aa57f0a	598	chan = iio_channel_get(dev, pdata->adc_batt_temp);
08d816b8	599	pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
98a27664 KM	600	}
	601
	602	static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
	603	{
	604	int i;
	605
	606	for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
	607	if (!pchg->chan[i])
	608	continue;
	609
	610	iio_channel_release(pchg->chan[i]);
	611	pchg->chan[i] = NULL;
	612	}
	613	}
	614
	615	static ssize_t lp8788_show_charger_status(struct device *dev,
	616	struct device_attribute attr, char buf)
	617	{
	618	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	619	enum lp8788_charging_state state;
	620	char *desc[LP8788_MAX_CHG_STATE] = {
	621	[LP8788_OFF] = "CHARGER OFF",
	622	[LP8788_WARM_UP] = "WARM UP",
	623	[LP8788_LOW_INPUT] = "LOW INPUT STATE",
	624	[LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
	625	[LP8788_CC] = "CHARGING - CC",
	626	[LP8788_CV] = "CHARGING - CV",
	627	[LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
	628	[LP8788_BATTERY_FAULT] = "BATTERY FAULT",
	629	[LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
	630	[LP8788_HIGH_CURRENT] = "HIGH CURRENT",
	631	};
	632	u8 data;
	633
	634	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	635	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
	636
4b44a1ed	637	return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]);
98a27664 KM	638	}
	639
	640	static ssize_t lp8788_show_eoc_time(struct device *dev,
	641	struct device_attribute attr, char buf)
	642	{
	643	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	644	char *stime[] = { "400ms", "5min", "10min", "15min",
	645	"20min", "25min", "30min" "No timeout" };
	646	u8 val;
	647
	648	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
	649	val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
	650
4b44a1ed	651	return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n",
98a27664 KM	652	stime[val]);
	653	}
	654
	655	static ssize_t lp8788_show_eoc_level(struct device *dev,
	656	struct device_attribute attr, char buf)
	657	{
	658	struct lp8788_charger *pchg = dev_get_drvdata(dev);
	659	char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
	660	char *relative_level[] = { "5%", "10%", "15%", "20%" };
	661	char *level;
	662	u8 val;
	663	u8 mode;
	664
	665	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
	666
	667	mode = val & LP8788_CHG_EOC_MODE_M;
	668	val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
	669	level = mode ? abs_level[val] : relative_level[val];
	670
4b44a1ed	671	return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level);
98a27664 KM	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");