Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 521 insertions, 0 deletions

diff --git a/drivers/power/supply/bq24735-charger.c b/drivers/power/supply/bq24735-charger.c
new file mode 100644
index 000000000..6931e1d82
--- /dev/null
+++ b/drivers/power/supply/bq24735-charger.c
@@ -0,0 +1,521 @@
+/*
+ * Battery charger driver for TI BQ24735
+ *
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/gpio/consumer.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+
+#include <linux/power/bq24735-charger.h>
+
+#define BQ24735_CHG_OPT			0x12
+#define BQ24735_CHG_OPT_CHARGE_DISABLE	(1 << 0)
+#define BQ24735_CHG_OPT_AC_PRESENT	(1 << 4)
+#define BQ24735_CHARGE_CURRENT		0x14
+#define BQ24735_CHARGE_CURRENT_MASK	0x1fc0
+#define BQ24735_CHARGE_VOLTAGE		0x15
+#define BQ24735_CHARGE_VOLTAGE_MASK	0x7ff0
+#define BQ24735_INPUT_CURRENT		0x3f
+#define BQ24735_INPUT_CURRENT_MASK	0x1f80
+#define BQ24735_MANUFACTURER_ID		0xfe
+#define BQ24735_DEVICE_ID		0xff
+
+struct bq24735 {
+	struct power_supply		*charger;
+	struct power_supply_desc	charger_desc;
+	struct i2c_client		*client;
+	struct bq24735_platform		*pdata;
+	struct mutex			lock;
+	struct gpio_desc		*status_gpio;
+	struct delayed_work		poll;
+	u32				poll_interval;
+	bool				charging;
+};
+
+static inline struct bq24735 *to_bq24735(struct power_supply *psy)
+{
+	return power_supply_get_drvdata(psy);
+}
+
+static enum power_supply_property bq24735_charger_properties[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int bq24735_charger_property_is_writeable(struct power_supply *psy,
+						 enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		return 1;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
+				     u16 value)
+{
+	return i2c_smbus_write_word_data(client, reg, value);
+}
+
+static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
+{
+	return i2c_smbus_read_word_data(client, reg);
+}
+
+static int bq24735_update_word(struct i2c_client *client, u8 reg,
+			       u16 mask, u16 value)
+{
+	unsigned int tmp;
+	int ret;
+
+	ret = bq24735_read_word(client, reg);
+	if (ret < 0)
+		return ret;
+
+	tmp = ret & ~mask;
+	tmp |= value & mask;
+
+	return bq24735_write_word(client, reg, tmp);
+}
+
+static int bq24735_config_charger(struct bq24735 *charger)
+{
+	struct bq24735_platform *pdata = charger->pdata;
+	int ret;
+	u16 value;
+
+	if (pdata->ext_control)
+		return 0;
+
+	if (pdata->charge_current) {
+		value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
+
+		ret = bq24735_write_word(charger->client,
+					 BQ24735_CHARGE_CURRENT, value);
+		if (ret < 0) {
+			dev_err(&charger->client->dev,
+				"Failed to write charger current : %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	if (pdata->charge_voltage) {
+		value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
+
+		ret = bq24735_write_word(charger->client,
+					 BQ24735_CHARGE_VOLTAGE, value);
+		if (ret < 0) {
+			dev_err(&charger->client->dev,
+				"Failed to write charger voltage : %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	if (pdata->input_current) {
+		value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
+
+		ret = bq24735_write_word(charger->client,
+					 BQ24735_INPUT_CURRENT, value);
+		if (ret < 0) {
+			dev_err(&charger->client->dev,
+				"Failed to write input current : %d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static inline int bq24735_enable_charging(struct bq24735 *charger)
+{
+	int ret;
+
+	if (charger->pdata->ext_control)
+		return 0;
+
+	ret = bq24735_config_charger(charger);
+	if (ret)
+		return ret;
+
+	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
+				   BQ24735_CHG_OPT_CHARGE_DISABLE, 0);
+}
+
+static inline int bq24735_disable_charging(struct bq24735 *charger)
+{
+	if (charger->pdata->ext_control)
+		return 0;
+
+	return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
+				   BQ24735_CHG_OPT_CHARGE_DISABLE,
+				   BQ24735_CHG_OPT_CHARGE_DISABLE);
+}
+
+static bool bq24735_charger_is_present(struct bq24735 *charger)
+{
+	if (charger->status_gpio) {
+		return !gpiod_get_value_cansleep(charger->status_gpio);
+	} else {
+		int ac = 0;
+
+		ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
+		if (ac < 0) {
+			dev_dbg(&charger->client->dev,
+				"Failed to read charger options : %d\n",
+				ac);
+			return false;
+		}
+		return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
+	}
+
+	return false;
+}
+
+static int bq24735_charger_is_charging(struct bq24735 *charger)
+{
+	int ret;
+
+	if (!bq24735_charger_is_present(charger))
+		return 0;
+
+	ret  = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
+	if (ret < 0)
+		return ret;
+
+	return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
+}
+
+static void bq24735_update(struct bq24735 *charger)
+{
+	mutex_lock(&charger->lock);
+
+	if (charger->charging && bq24735_charger_is_present(charger))
+		bq24735_enable_charging(charger);
+	else
+		bq24735_disable_charging(charger);
+
+	mutex_unlock(&charger->lock);
+
+	power_supply_changed(charger->charger);
+}
+
+static irqreturn_t bq24735_charger_isr(int irq, void *devid)
+{
+	struct power_supply *psy = devid;
+	struct bq24735 *charger = to_bq24735(psy);
+
+	bq24735_update(charger);
+
+	return IRQ_HANDLED;
+}
+
+static void bq24735_poll(struct work_struct *work)
+{
+	struct bq24735 *charger = container_of(work, struct bq24735, poll.work);
+
+	bq24735_update(charger);
+
+	schedule_delayed_work(&charger->poll,
+			      msecs_to_jiffies(charger->poll_interval));
+}
+
+static int bq24735_charger_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct bq24735 *charger = to_bq24735(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
+		break;
+	case POWER_SUPPLY_PROP_STATUS:
+		switch (bq24735_charger_is_charging(charger)) {
+		case 1:
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			break;
+		case 0:
+			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+			break;
+		default:
+			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+			break;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int bq24735_charger_set_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					const union power_supply_propval *val)
+{
+	struct bq24735 *charger = to_bq24735(psy);
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		switch (val->intval) {
+		case POWER_SUPPLY_STATUS_CHARGING:
+			mutex_lock(&charger->lock);
+			charger->charging = true;
+			ret = bq24735_enable_charging(charger);
+			mutex_unlock(&charger->lock);
+			if (ret)
+				return ret;
+			break;
+		case POWER_SUPPLY_STATUS_DISCHARGING:
+		case POWER_SUPPLY_STATUS_NOT_CHARGING:
+			mutex_lock(&charger->lock);
+			charger->charging = false;
+			ret = bq24735_disable_charging(charger);
+			mutex_unlock(&charger->lock);
+			if (ret)
+				return ret;
+			break;
+		default:
+			return -EINVAL;
+		}
+		power_supply_changed(psy);
+		break;
+	default:
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
+{
+	struct bq24735_platform *pdata;
+	struct device_node *np = client->dev.of_node;
+	u32 val;
+	int ret;
+
+	pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(&client->dev,
+			"Memory alloc for bq24735 pdata failed\n");
+		return NULL;
+	}
+
+	ret = of_property_read_u32(np, "ti,charge-current", &val);
+	if (!ret)
+		pdata->charge_current = val;
+
+	ret = of_property_read_u32(np, "ti,charge-voltage", &val);
+	if (!ret)
+		pdata->charge_voltage = val;
+
+	ret = of_property_read_u32(np, "ti,input-current", &val);
+	if (!ret)
+		pdata->input_current = val;
+
+	pdata->ext_control = of_property_read_bool(np, "ti,external-control");
+
+	return pdata;
+}
+
+static int bq24735_charger_probe(struct i2c_client *client,
+				 const struct i2c_device_id *id)
+{
+	int ret;
+	struct bq24735 *charger;
+	struct power_supply_desc *supply_desc;
+	struct power_supply_config psy_cfg = {};
+	char *name;
+
+	charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	mutex_init(&charger->lock);
+	charger->charging = true;
+	charger->pdata = client->dev.platform_data;
+
+	if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
+		charger->pdata = bq24735_parse_dt_data(client);
+
+	if (!charger->pdata) {
+		dev_err(&client->dev, "no platform data provided\n");
+		return -EINVAL;
+	}
+
+	name = (char *)charger->pdata->name;
+	if (!name) {
+		name = devm_kasprintf(&client->dev, GFP_KERNEL,
+				      "bq24735@%s",
+				      dev_name(&client->dev));
+		if (!name) {
+			dev_err(&client->dev, "Failed to alloc device name\n");
+			return -ENOMEM;
+		}
+	}
+
+	charger->client = client;
+
+	supply_desc = &charger->charger_desc;
+
+	supply_desc->name = name;
+	supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
+	supply_desc->properties = bq24735_charger_properties;
+	supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
+	supply_desc->get_property = bq24735_charger_get_property;
+	supply_desc->set_property = bq24735_charger_set_property;
+	supply_desc->property_is_writeable =
+				bq24735_charger_property_is_writeable;
+
+	psy_cfg.supplied_to = charger->pdata->supplied_to;
+	psy_cfg.num_supplicants = charger->pdata->num_supplicants;
+	psy_cfg.of_node = client->dev.of_node;
+	psy_cfg.drv_data = charger;
+
+	i2c_set_clientdata(client, charger);
+
+	charger->status_gpio = devm_gpiod_get_optional(&client->dev,
+						       "ti,ac-detect",
+						       GPIOD_IN);
+	if (IS_ERR(charger->status_gpio)) {
+		ret = PTR_ERR(charger->status_gpio);
+		dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
+		return ret;
+	}
+
+	if (bq24735_charger_is_present(charger)) {
+		ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
+		if (ret < 0) {
+			dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
+				ret);
+			return ret;
+		} else if (ret != 0x0040) {
+			dev_err(&client->dev,
+				"manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
+			return -ENODEV;
+		}
+
+		ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
+		if (ret < 0) {
+			dev_err(&client->dev, "Failed to read device id : %d\n", ret);
+			return ret;
+		} else if (ret != 0x000B) {
+			dev_err(&client->dev,
+				"device id mismatch. 0x000b != 0x%04x\n", ret);
+			return -ENODEV;
+		}
+
+		ret = bq24735_enable_charging(charger);
+		if (ret < 0) {
+			dev_err(&client->dev, "Failed to enable charging\n");
+			return ret;
+		}
+	}
+
+	charger->charger = devm_power_supply_register(&client->dev, supply_desc,
+						      &psy_cfg);
+	if (IS_ERR(charger->charger)) {
+		ret = PTR_ERR(charger->charger);
+		dev_err(&client->dev, "Failed to register power supply: %d\n",
+			ret);
+		return ret;
+	}
+
+	if (client->irq) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+						NULL, bq24735_charger_isr,
+						IRQF_TRIGGER_RISING |
+						IRQF_TRIGGER_FALLING |
+						IRQF_ONESHOT,
+						supply_desc->name,
+						charger->charger);
+		if (ret) {
+			dev_err(&client->dev,
+				"Unable to register IRQ %d err %d\n",
+				client->irq, ret);
+			return ret;
+		}
+	} else {
+		ret = device_property_read_u32(&client->dev, "poll-interval",
+					       &charger->poll_interval);
+		if (ret)
+			return 0;
+		if (!charger->poll_interval)
+			return 0;
+
+		INIT_DELAYED_WORK(&charger->poll, bq24735_poll);
+		schedule_delayed_work(&charger->poll,
+				      msecs_to_jiffies(charger->poll_interval));
+	}
+
+	return 0;
+}
+
+static int bq24735_charger_remove(struct i2c_client *client)
+{
+	struct bq24735 *charger = i2c_get_clientdata(client);
+
+	if (charger->poll_interval)
+		cancel_delayed_work_sync(&charger->poll);
+
+	return 0;
+}
+
+static const struct i2c_device_id bq24735_charger_id[] = {
+	{ "bq24735-charger", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
+
+static const struct of_device_id bq24735_match_ids[] = {
+	{ .compatible = "ti,bq24735", },
+	{ /* end */ }
+};
+MODULE_DEVICE_TABLE(of, bq24735_match_ids);
+
+static struct i2c_driver bq24735_charger_driver = {
+	.driver = {
+		.name = "bq24735-charger",
+		.of_match_table = bq24735_match_ids,
+	},
+	.probe = bq24735_charger_probe,
+	.remove = bq24735_charger_remove,
+	.id_table = bq24735_charger_id,
+};
+
+module_i2c_driver(bq24735_charger_driver);
+
+MODULE_DESCRIPTION("bq24735 battery charging driver");
+MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
+MODULE_LICENSE("GPL v2");