1 files changed, 295 insertions, 0 deletions
diff --git a/drivers/power/supply/tps65217_charger.c b/drivers/power/supply/tps65217_charger.c
new file mode 100644
index 000000000000..9fd019f9b88c
--- /dev/null
+++ b/drivers/power/supply/tps65217_charger.c
@@ -0,0 +1,295 @@
+/*
+ * Battery charger driver for TI's tps65217
+ *
+ * Copyright (c) 2015, Collabora Ltd.
+
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * Battery charger driver for TI's tps65217
+ */
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/power_supply.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65217.h>
+
+#define POLL_INTERVAL		(HZ * 2)
+
+struct tps65217_charger {
+	struct tps65217 *tps;
+	struct device *dev;
+	struct power_supply *ac;
+
+	int	ac_online;
+	int	prev_ac_online;
+
+	struct task_struct	*poll_task;
+
+	int	irq;
+};
+
+static enum power_supply_property tps65217_ac_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static int tps65217_config_charger(struct tps65217_charger *charger)
+{
+	int ret;
+
+	dev_dbg(charger->dev, "%s\n", __func__);
+
+	/*
+	 * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
+	 *
+	 * The device can be configured to support a 100k NTC (B = 3960) by
+	 * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
+	 * is not recommended to do so. In sleep mode, the charger continues
+	 * charging the battery, but all register values are reset to default
+	 * values. Therefore, the charger would get the wrong temperature
+	 * information. If 100k NTC setting is required, please contact the
+	 * factory.
+	 *
+	 * ATTENTION, conflicting information, from p. 46
+	 *
+	 * NTC TYPE (for battery temperature measurement)
+	 *   0 – 100k (curve 1, B = 3960)
+	 *   1 – 10k  (curve 2, B = 3480) (default on reset)
+	 *
+	 */
+	ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
+				  TPS65217_CHGCONFIG1_NTC_TYPE,
+				  TPS65217_PROTECT_NONE);
+	if (ret) {
+		dev_err(charger->dev,
+			"failed to set 100k NTC setting: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int tps65217_enable_charging(struct tps65217_charger *charger)
+{
+	int ret;
+
+	/* charger already enabled */
+	if (charger->ac_online)
+		return 0;
+
+	dev_dbg(charger->dev, "%s: enable charging\n", __func__);
+	ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
+				TPS65217_CHGCONFIG1_CHG_EN,
+				TPS65217_CHGCONFIG1_CHG_EN,
+				TPS65217_PROTECT_NONE);
+	if (ret) {
+		dev_err(charger->dev,
+			"%s: Error in writing CHG_EN in reg 0x%x: %d\n",
+			__func__, TPS65217_REG_CHGCONFIG1, ret);
+		return ret;
+	}
+
+	charger->ac_online = 1;
+
+	return 0;
+}
+
+static int tps65217_ac_get_property(struct power_supply *psy,
+			enum power_supply_property psp,
+			union power_supply_propval *val)
+{
+	struct tps65217_charger *charger = power_supply_get_drvdata(psy);
+
+	if (psp == POWER_SUPPLY_PROP_ONLINE) {
+		val->intval = charger->ac_online;
+		return 0;
+	}
+	return -EINVAL;
+}
+
+static irqreturn_t tps65217_charger_irq(int irq, void *dev)
+{
+	int ret, val;
+	struct tps65217_charger *charger = dev;
+
+	charger->prev_ac_online = charger->ac_online;
+
+	ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
+	if (ret < 0) {
+		dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
+			__func__, TPS65217_REG_STATUS);
+		return IRQ_HANDLED;
+	}
+
+	dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);
+
+	/* check for AC status bit */
+	if (val & TPS65217_STATUS_ACPWR) {
+		ret = tps65217_enable_charging(charger);
+		if (ret) {
+			dev_err(charger->dev,
+				"failed to enable charger: %d\n", ret);
+			return IRQ_HANDLED;
+		}
+	} else {
+		charger->ac_online = 0;
+	}
+
+	if (charger->prev_ac_online != charger->ac_online)
+		power_supply_changed(charger->ac);
+
+	ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
+	if (ret < 0) {
+		dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
+			__func__, TPS65217_REG_CHGCONFIG0);
+		return IRQ_HANDLED;
+	}
+
+	if (val & TPS65217_CHGCONFIG0_ACTIVE)
+		dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
+	else
+		dev_dbg(charger->dev,
+			"%s: charger is NOT charging\n", __func__);
+
+	return IRQ_HANDLED;
+}
+
+static int tps65217_charger_poll_task(void *data)
+{
+	set_freezable();
+
+	while (!kthread_should_stop()) {
+		schedule_timeout_interruptible(POLL_INTERVAL);
+		try_to_freeze();
+		tps65217_charger_irq(-1, data);
+	}
+	return 0;
+}
+
+static const struct power_supply_desc tps65217_charger_desc = {
+	.name			= "tps65217-ac",
+	.type			= POWER_SUPPLY_TYPE_MAINS,
+	.get_property		= tps65217_ac_get_property,
+	.properties		= tps65217_ac_props,
+	.num_properties		= ARRAY_SIZE(tps65217_ac_props),
+};
+
+static int tps65217_charger_probe(struct platform_device *pdev)
+{
+	struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
+	struct tps65217_charger *charger;
+	struct power_supply_config cfg = {};
+	int irq;
+	int ret;
+
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, charger);
+	charger->tps = tps;
+	charger->dev = &pdev->dev;
+
+	cfg.of_node = pdev->dev.of_node;
+	cfg.drv_data = charger;
+
+	charger->ac = devm_power_supply_register(&pdev->dev,
+						 &tps65217_charger_desc,
+						 &cfg);
+	if (IS_ERR(charger->ac)) {
+		dev_err(&pdev->dev, "failed: power supply register\n");
+		return PTR_ERR(charger->ac);
+	}
+
+	irq = platform_get_irq_byname(pdev, "AC");
+	if (irq < 0)
+		irq = -ENXIO;
+	charger->irq = irq;
+
+	ret = tps65217_config_charger(charger);
+	if (ret < 0) {
+		dev_err(charger->dev, "charger config failed, err %d\n", ret);
+		return ret;
+	}
+
+	if (irq != -ENXIO) {
+		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+						tps65217_charger_irq,
+						0, "tps65217-charger",
+						charger);
+		if (ret) {
+			dev_err(charger->dev,
+				"Unable to register irq %d err %d\n", irq,
+				ret);
+			return ret;
+		}
+
+		/* Check current state */
+		tps65217_charger_irq(irq, charger);
+	} else {
+		charger->poll_task = kthread_run(tps65217_charger_poll_task,
+						charger, "ktps65217charger");
+		if (IS_ERR(charger->poll_task)) {
+			ret = PTR_ERR(charger->poll_task);
+			dev_err(charger->dev,
+				"Unable to run kthread err %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int tps65217_charger_remove(struct platform_device *pdev)
+{
+	struct tps65217_charger *charger = platform_get_drvdata(pdev);
+
+	if (charger->irq == -ENXIO)
+		kthread_stop(charger->poll_task);
+
+	return 0;
+}
+
+static const struct of_device_id tps65217_charger_match_table[] = {
+	{ .compatible = "ti,tps65217-charger", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);
+
+static struct platform_driver tps65217_charger_driver = {
+	.probe	= tps65217_charger_probe,
+	.remove = tps65217_charger_remove,
+	.driver	= {
+		.name	= "tps65217-charger",
+		.of_match_table = of_match_ptr(tps65217_charger_match_table),
+	},
+
+};
+module_platform_driver(tps65217_charger_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
+MODULE_DESCRIPTION("TPS65217 battery charger driver");