Initial import

1 files changed, 630 insertions, 0 deletions

diff --git a/drivers/power/lp8727_charger.c b/drivers/power/lp8727_charger.c
new file mode 100644
index 000000000..7e741f1d3
--- /dev/null
+++ b/drivers/power/lp8727_charger.c
@@ -0,0 +1,630 @@
+/*
+ * Driver for LP8727 Micro/Mini USB IC with integrated charger
+ *
+ *			Copyright (C) 2011 Texas Instruments
+ *			Copyright (C) 2011 National Semiconductor
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/power_supply.h>
+#include <linux/platform_data/lp8727.h>
+#include <linux/of.h>
+
+#define LP8788_NUM_INTREGS	2
+#define DEFAULT_DEBOUNCE_MSEC	270
+
+/* Registers */
+#define LP8727_CTRL1		0x1
+#define LP8727_CTRL2		0x2
+#define LP8727_SWCTRL		0x3
+#define LP8727_INT1		0x4
+#define LP8727_INT2		0x5
+#define LP8727_STATUS1		0x6
+#define LP8727_STATUS2		0x7
+#define LP8727_CHGCTRL2		0x9
+
+/* CTRL1 register */
+#define LP8727_CP_EN		BIT(0)
+#define LP8727_ADC_EN		BIT(1)
+#define LP8727_ID200_EN		BIT(4)
+
+/* CTRL2 register */
+#define LP8727_CHGDET_EN	BIT(1)
+#define LP8727_INT_EN		BIT(6)
+
+/* SWCTRL register */
+#define LP8727_SW_DM1_DM	(0x0 << 0)
+#define LP8727_SW_DM1_HiZ	(0x7 << 0)
+#define LP8727_SW_DP2_DP	(0x0 << 3)
+#define LP8727_SW_DP2_HiZ	(0x7 << 3)
+
+/* INT1 register */
+#define LP8727_IDNO		(0xF << 0)
+#define LP8727_VBUS		BIT(4)
+
+/* STATUS1 register */
+#define LP8727_CHGSTAT		(3 << 4)
+#define LP8727_CHPORT		BIT(6)
+#define LP8727_DCPORT		BIT(7)
+#define LP8727_STAT_EOC		0x30
+
+/* STATUS2 register */
+#define LP8727_TEMP_STAT	(3 << 5)
+#define LP8727_TEMP_SHIFT	5
+
+/* CHGCTRL2 register */
+#define LP8727_ICHG_SHIFT	4
+
+enum lp8727_dev_id {
+	LP8727_ID_NONE,
+	LP8727_ID_TA,
+	LP8727_ID_DEDICATED_CHG,
+	LP8727_ID_USB_CHG,
+	LP8727_ID_USB_DS,
+	LP8727_ID_MAX,
+};
+
+enum lp8727_die_temp {
+	LP8788_TEMP_75C,
+	LP8788_TEMP_95C,
+	LP8788_TEMP_115C,
+	LP8788_TEMP_135C,
+};
+
+struct lp8727_psy {
+	struct power_supply *ac;
+	struct power_supply *usb;
+	struct power_supply *batt;
+};
+
+struct lp8727_chg {
+	struct device *dev;
+	struct i2c_client *client;
+	struct mutex xfer_lock;
+	struct lp8727_psy *psy;
+	struct lp8727_platform_data *pdata;
+
+	/* Charger Data */
+	enum lp8727_dev_id devid;
+	struct lp8727_chg_param *chg_param;
+
+	/* Interrupt Handling */
+	int irq;
+	struct delayed_work work;
+	unsigned long debounce_jiffies;
+};
+
+static int lp8727_read_bytes(struct lp8727_chg *pchg, u8 reg, u8 *data, u8 len)
+{
+	s32 ret;
+
+	mutex_lock(&pchg->xfer_lock);
+	ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
+	mutex_unlock(&pchg->xfer_lock);
+
+	return (ret != len) ? -EIO : 0;
+}
+
+static inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
+{
+	return lp8727_read_bytes(pchg, reg, data, 1);
+}
+
+static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
+{
+	int ret;
+
+	mutex_lock(&pchg->xfer_lock);
+	ret = i2c_smbus_write_byte_data(pchg->client, reg, data);
+	mutex_unlock(&pchg->xfer_lock);
+
+	return ret;
+}
+
+static bool lp8727_is_charger_attached(const char *name, int id)
+{
+	if (!strcmp(name, "ac"))
+		return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
+	else if (!strcmp(name, "usb"))
+		return id == LP8727_ID_USB_CHG;
+
+	return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
+}
+
+static int lp8727_init_device(struct lp8727_chg *pchg)
+{
+	u8 val;
+	int ret;
+	u8 intstat[LP8788_NUM_INTREGS];
+
+	/* clear interrupts */
+	ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
+	if (ret)
+		return ret;
+
+	val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
+	ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
+	if (ret)
+		return ret;
+
+	val = LP8727_INT_EN | LP8727_CHGDET_EN;
+	return lp8727_write_byte(pchg, LP8727_CTRL2, val);
+}
+
+static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
+{
+	u8 val;
+
+	lp8727_read_byte(pchg, LP8727_STATUS1, &val);
+	return val & LP8727_DCPORT;
+}
+
+static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
+{
+	u8 val;
+
+	lp8727_read_byte(pchg, LP8727_STATUS1, &val);
+	return val & LP8727_CHPORT;
+}
+
+static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
+{
+	lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
+}
+
+static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
+{
+	struct lp8727_platform_data *pdata = pchg->pdata;
+	u8 devid = LP8727_ID_NONE;
+	u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
+
+	switch (id) {
+	case 0x5:
+		devid = LP8727_ID_TA;
+		pchg->chg_param = pdata ? pdata->ac : NULL;
+		break;
+	case 0xB:
+		if (lp8727_is_dedicated_charger(pchg)) {
+			pchg->chg_param = pdata ? pdata->ac : NULL;
+			devid = LP8727_ID_DEDICATED_CHG;
+		} else if (lp8727_is_usb_charger(pchg)) {
+			pchg->chg_param = pdata ? pdata->usb : NULL;
+			devid = LP8727_ID_USB_CHG;
+			swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
+		} else if (vbusin) {
+			devid = LP8727_ID_USB_DS;
+			swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
+		}
+		break;
+	default:
+		devid = LP8727_ID_NONE;
+		pchg->chg_param = NULL;
+		break;
+	}
+
+	pchg->devid = devid;
+	lp8727_ctrl_switch(pchg, swctrl);
+}
+
+static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
+{
+	u8 val;
+
+	lp8727_read_byte(pchg, LP8727_CTRL2, &val);
+	val |= LP8727_CHGDET_EN;
+	lp8727_write_byte(pchg, LP8727_CTRL2, val);
+}
+
+static void lp8727_delayed_func(struct work_struct *_work)
+{
+	struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
+						work.work);
+	u8 intstat[LP8788_NUM_INTREGS];
+	u8 idno;
+	u8 vbus;
+
+	if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
+		dev_err(pchg->dev, "can not read INT registers\n");
+		return;
+	}
+
+	idno = intstat[0] & LP8727_IDNO;
+	vbus = intstat[0] & LP8727_VBUS;
+
+	lp8727_id_detection(pchg, idno, vbus);
+	lp8727_enable_chgdet(pchg);
+
+	power_supply_changed(pchg->psy->ac);
+	power_supply_changed(pchg->psy->usb);
+	power_supply_changed(pchg->psy->batt);
+}
+
+static irqreturn_t lp8727_isr_func(int irq, void *ptr)
+{
+	struct lp8727_chg *pchg = ptr;
+
+	schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
+	return IRQ_HANDLED;
+}
+
+static int lp8727_setup_irq(struct lp8727_chg *pchg)
+{
+	int ret;
+	int irq = pchg->client->irq;
+	unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
+						DEFAULT_DEBOUNCE_MSEC;
+
+	INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
+
+	if (irq <= 0) {
+		dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
+		return 0;
+	}
+
+	ret = request_threaded_irq(irq,	NULL, lp8727_isr_func,
+				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+				"lp8727_irq", pchg);
+
+	if (ret)
+		return ret;
+
+	pchg->irq = irq;
+	pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
+
+	return 0;
+}
+
+static void lp8727_release_irq(struct lp8727_chg *pchg)
+{
+	cancel_delayed_work_sync(&pchg->work);
+
+	if (pchg->irq)
+		free_irq(pchg->irq, pchg);
+}
+
+static enum power_supply_property lp8727_charger_prop[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static enum power_supply_property lp8727_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_TEMP,
+};
+
+static char *battery_supplied_to[] = {
+	"main_batt",
+};
+
+static int lp8727_charger_get_property(struct power_supply *psy,
+				       enum power_supply_property psp,
+				       union power_supply_propval *val)
+{
+	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
+
+	if (psp != POWER_SUPPLY_PROP_ONLINE)
+		return -EINVAL;
+
+	val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);
+
+	return 0;
+}
+
+static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
+{
+	switch (temp) {
+	case LP8788_TEMP_95C:
+	case LP8788_TEMP_115C:
+	case LP8788_TEMP_135C:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static int lp8727_battery_get_property(struct power_supply *psy,
+				       enum power_supply_property psp,
+				       union power_supply_propval *val)
+{
+	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
+	struct lp8727_platform_data *pdata = pchg->pdata;
+	enum lp8727_die_temp temp;
+	u8 read;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid)) {
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			return 0;
+		}
+
+		lp8727_read_byte(pchg, LP8727_STATUS1, &read);
+
+		val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
+				POWER_SUPPLY_STATUS_FULL :
+				POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		lp8727_read_byte(pchg, LP8727_STATUS2, &read);
+		temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
+
+		val->intval = lp8727_is_high_temperature(temp) ?
+			POWER_SUPPLY_HEALTH_OVERHEAT :
+			POWER_SUPPLY_HEALTH_GOOD;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		if (!pdata)
+			return -EINVAL;
+
+		if (pdata->get_batt_present)
+			val->intval = pdata->get_batt_present();
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		if (!pdata)
+			return -EINVAL;
+
+		if (pdata->get_batt_level)
+			val->intval = pdata->get_batt_level();
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		if (!pdata)
+			return -EINVAL;
+
+		if (pdata->get_batt_capacity)
+			val->intval = pdata->get_batt_capacity();
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		if (!pdata)
+			return -EINVAL;
+
+		if (pdata->get_batt_temp)
+			val->intval = pdata->get_batt_temp();
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static void lp8727_charger_changed(struct power_supply *psy)
+{
+	struct lp8727_chg *pchg = dev_get_drvdata(psy->dev.parent);
+	u8 eoc_level;
+	u8 ichg;
+	u8 val;
+
+	/* skip if no charger exists */
+	if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
+		return;
+
+	/* update charging parameters */
+	if (pchg->chg_param) {
+		eoc_level = pchg->chg_param->eoc_level;
+		ichg = pchg->chg_param->ichg;
+		val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
+		lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
+	}
+}
+
+static const struct power_supply_desc lp8727_ac_desc = {
+	.name			= "ac",
+	.type			= POWER_SUPPLY_TYPE_MAINS,
+	.properties		= lp8727_charger_prop,
+	.num_properties		= ARRAY_SIZE(lp8727_charger_prop),
+	.get_property		= lp8727_charger_get_property,
+};
+
+static const struct power_supply_desc lp8727_usb_desc = {
+	.name			= "usb",
+	.type			= POWER_SUPPLY_TYPE_USB,
+	.properties		= lp8727_charger_prop,
+	.num_properties		= ARRAY_SIZE(lp8727_charger_prop),
+	.get_property		= lp8727_charger_get_property,
+};
+
+static const struct power_supply_desc lp8727_batt_desc = {
+	.name			= "main_batt",
+	.type			= POWER_SUPPLY_TYPE_BATTERY,
+	.properties		= lp8727_battery_prop,
+	.num_properties		= ARRAY_SIZE(lp8727_battery_prop),
+	.get_property		= lp8727_battery_get_property,
+	.external_power_changed	= lp8727_charger_changed,
+};
+
+static int lp8727_register_psy(struct lp8727_chg *pchg)
+{
+	struct power_supply_config psy_cfg = {}; /* Only for ac and usb */
+	struct lp8727_psy *psy;
+
+	psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
+	if (!psy)
+		return -ENOMEM;
+
+	pchg->psy = psy;
+
+	psy_cfg.supplied_to = battery_supplied_to;
+	psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
+
+	psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
+	if (IS_ERR(psy->ac))
+		goto err_psy_ac;
+
+	psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
+					 &psy_cfg);
+	if (IS_ERR(psy->usb))
+		goto err_psy_usb;
+
+	psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
+	if (IS_ERR(psy->batt))
+		goto err_psy_batt;
+
+	return 0;
+
+err_psy_batt:
+	power_supply_unregister(psy->usb);
+err_psy_usb:
+	power_supply_unregister(psy->ac);
+err_psy_ac:
+	return -EPERM;
+}
+
+static void lp8727_unregister_psy(struct lp8727_chg *pchg)
+{
+	struct lp8727_psy *psy = pchg->psy;
+
+	if (!psy)
+		return;
+
+	power_supply_unregister(psy->ac);
+	power_supply_unregister(psy->usb);
+	power_supply_unregister(psy->batt);
+}
+
+#ifdef CONFIG_OF
+static struct lp8727_chg_param
+*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
+{
+	struct lp8727_chg_param *param;
+
+	param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
+	if (!param)
+		goto out;
+
+	of_property_read_u8(np, "eoc-level", (u8 *)&param->eoc_level);
+	of_property_read_u8(np, "charging-current", (u8 *)&param->ichg);
+out:
+	return param;
+}
+
+static int lp8727_parse_dt(struct device *dev)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *child;
+	struct lp8727_platform_data *pdata;
+	const char *type;
+
+	/* If charging parameter is not defined, just skip parsing the dt */
+	if (of_get_child_count(np) == 0)
+		goto out;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
+
+	for_each_child_of_node(np, child) {
+		of_property_read_string(child, "charger-type", &type);
+
+		if (!strcmp(type, "ac"))
+			pdata->ac = lp8727_parse_charge_pdata(dev, child);
+
+		if (!strcmp(type, "usb"))
+			pdata->usb = lp8727_parse_charge_pdata(dev, child);
+	}
+
+	dev->platform_data = pdata;
+out:
+	return 0;
+}
+#else
+static int lp8727_parse_dt(struct device *dev)
+{
+	return 0;
+}
+#endif
+
+static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
+{
+	struct lp8727_chg *pchg;
+	int ret;
+
+	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
+		return -EIO;
+
+	if (cl->dev.of_node) {
+		ret = lp8727_parse_dt(&cl->dev);
+		if (ret)
+			return ret;
+	}
+
+	pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
+	if (!pchg)
+		return -ENOMEM;
+
+	pchg->client = cl;
+	pchg->dev = &cl->dev;
+	pchg->pdata = cl->dev.platform_data;
+	i2c_set_clientdata(cl, pchg);
+
+	mutex_init(&pchg->xfer_lock);
+
+	ret = lp8727_init_device(pchg);
+	if (ret) {
+		dev_err(pchg->dev, "i2c communication err: %d", ret);
+		return ret;
+	}
+
+	ret = lp8727_register_psy(pchg);
+	if (ret) {
+		dev_err(pchg->dev, "power supplies register err: %d", ret);
+		return ret;
+	}
+
+	ret = lp8727_setup_irq(pchg);
+	if (ret) {
+		dev_err(pchg->dev, "irq handler err: %d", ret);
+		lp8727_unregister_psy(pchg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int lp8727_remove(struct i2c_client *cl)
+{
+	struct lp8727_chg *pchg = i2c_get_clientdata(cl);
+
+	lp8727_release_irq(pchg);
+	lp8727_unregister_psy(pchg);
+	return 0;
+}
+
+static const struct of_device_id lp8727_dt_ids[] = {
+	{ .compatible = "ti,lp8727", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
+
+static const struct i2c_device_id lp8727_ids[] = {
+	{"lp8727", 0},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp8727_ids);
+
+static struct i2c_driver lp8727_driver = {
+	.driver = {
+		   .name = "lp8727",
+		   .of_match_table = of_match_ptr(lp8727_dt_ids),
+		   },
+	.probe = lp8727_probe,
+	.remove = lp8727_remove,
+	.id_table = lp8727_ids,
+};
+module_i2c_driver(lp8727_driver);
+
+MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
+MODULE_LICENSE("GPL");