Adding upstream version 6.1.76.upstream/6.1.76

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

1 files changed, 190 insertions, 0 deletions

diff --git a/drivers/power/supply/ingenic-battery.c b/drivers/power/supply/ingenic-battery.c
new file mode 100644
index 000000000..2e7fdfde4
--- /dev/null
+++ b/drivers/power/supply/ingenic-battery.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Battery driver for the Ingenic JZ47xx SoCs
+ * Copyright (c) 2019 Artur Rojek <contact@artur-rojek.eu>
+ *
+ * based on drivers/power/supply/jz4740-battery.c
+ */
+
+#include <linux/iio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/property.h>
+
+struct ingenic_battery {
+	struct device *dev;
+	struct iio_channel *channel;
+	struct power_supply_desc desc;
+	struct power_supply *battery;
+	struct power_supply_battery_info *info;
+};
+
+static int ingenic_battery_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct ingenic_battery *bat = power_supply_get_drvdata(psy);
+	struct power_supply_battery_info *info = bat->info;
+	int ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_HEALTH:
+		ret = iio_read_channel_processed(bat->channel, &val->intval);
+		val->intval *= 1000;
+		if (val->intval < info->voltage_min_design_uv)
+			val->intval = POWER_SUPPLY_HEALTH_DEAD;
+		else if (val->intval > info->voltage_max_design_uv)
+			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+		else
+			val->intval = POWER_SUPPLY_HEALTH_GOOD;
+		return ret;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		ret = iio_read_channel_processed(bat->channel, &val->intval);
+		val->intval *= 1000;
+		return ret;
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+		val->intval = info->voltage_min_design_uv;
+		return 0;
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+		val->intval = info->voltage_max_design_uv;
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+/* Set the most appropriate IIO channel voltage reference scale
+ * based on the battery's max voltage.
+ */
+static int ingenic_battery_set_scale(struct ingenic_battery *bat)
+{
+	const int *scale_raw;
+	int scale_len, scale_type, best_idx = -1, best_mV, max_raw, i, ret;
+	u64 max_mV;
+
+	ret = iio_read_max_channel_raw(bat->channel, &max_raw);
+	if (ret) {
+		dev_err(bat->dev, "Unable to read max raw channel value\n");
+		return ret;
+	}
+
+	ret = iio_read_avail_channel_attribute(bat->channel, &scale_raw,
+					       &scale_type, &scale_len,
+					       IIO_CHAN_INFO_SCALE);
+	if (ret < 0) {
+		dev_err(bat->dev, "Unable to read channel avail scale\n");
+		return ret;
+	}
+	if (ret != IIO_AVAIL_LIST || scale_type != IIO_VAL_FRACTIONAL_LOG2)
+		return -EINVAL;
+
+	max_mV = bat->info->voltage_max_design_uv / 1000;
+
+	for (i = 0; i < scale_len; i += 2) {
+		u64 scale_mV = (max_raw * scale_raw[i]) >> scale_raw[i + 1];
+
+		if (scale_mV < max_mV)
+			continue;
+
+		if (best_idx >= 0 && scale_mV > best_mV)
+			continue;
+
+		best_mV = scale_mV;
+		best_idx = i;
+	}
+
+	if (best_idx < 0) {
+		dev_err(bat->dev, "Unable to find matching voltage scale\n");
+		return -EINVAL;
+	}
+
+	/* Only set scale if there is more than one (fractional) entry */
+	if (scale_len > 2) {
+		ret = iio_write_channel_attribute(bat->channel,
+						  scale_raw[best_idx],
+						  scale_raw[best_idx + 1],
+						  IIO_CHAN_INFO_SCALE);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static enum power_supply_property ingenic_battery_properties[] = {
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+};
+
+static int ingenic_battery_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ingenic_battery *bat;
+	struct power_supply_config psy_cfg = {};
+	struct power_supply_desc *desc;
+	int ret;
+
+	bat = devm_kzalloc(dev, sizeof(*bat), GFP_KERNEL);
+	if (!bat)
+		return -ENOMEM;
+
+	bat->dev = dev;
+	bat->channel = devm_iio_channel_get(dev, "battery");
+	if (IS_ERR(bat->channel))
+		return PTR_ERR(bat->channel);
+
+	desc = &bat->desc;
+	desc->name = "jz-battery";
+	desc->type = POWER_SUPPLY_TYPE_BATTERY;
+	desc->properties = ingenic_battery_properties;
+	desc->num_properties = ARRAY_SIZE(ingenic_battery_properties);
+	desc->get_property = ingenic_battery_get_property;
+	psy_cfg.drv_data = bat;
+	psy_cfg.of_node = dev->of_node;
+
+	bat->battery = devm_power_supply_register(dev, desc, &psy_cfg);
+	if (IS_ERR(bat->battery))
+		return dev_err_probe(dev, PTR_ERR(bat->battery),
+				     "Unable to register battery\n");
+
+	ret = power_supply_get_battery_info(bat->battery, &bat->info);
+	if (ret) {
+		dev_err(dev, "Unable to get battery info: %d\n", ret);
+		return ret;
+	}
+	if (bat->info->voltage_min_design_uv < 0) {
+		dev_err(dev, "Unable to get voltage min design\n");
+		return bat->info->voltage_min_design_uv;
+	}
+	if (bat->info->voltage_max_design_uv < 0) {
+		dev_err(dev, "Unable to get voltage max design\n");
+		return bat->info->voltage_max_design_uv;
+	}
+
+	return ingenic_battery_set_scale(bat);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ingenic_battery_of_match[] = {
+	{ .compatible = "ingenic,jz4740-battery", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ingenic_battery_of_match);
+#endif
+
+static struct platform_driver ingenic_battery_driver = {
+	.driver = {
+		.name = "ingenic-battery",
+		.of_match_table = of_match_ptr(ingenic_battery_of_match),
+	},
+	.probe = ingenic_battery_probe,
+};
+module_platform_driver(ingenic_battery_driver);
+
+MODULE_DESCRIPTION("Battery driver for Ingenic JZ47xx SoCs");
+MODULE_AUTHOR("Artur Rojek <contact@artur-rojek.eu>");
+MODULE_LICENSE("GPL");