2019-04-19 02:24:04 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Battery driver for the Ingenic JZ47xx SoCs
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* Copyright (c) 2019 Artur Rojek <contact@artur-rojek.eu>
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*
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* based on drivers/power/supply/jz4740-battery.c
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*/
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#include <linux/iio/consumer.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/property.h>
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struct ingenic_battery {
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struct device *dev;
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struct iio_channel *channel;
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struct power_supply_desc desc;
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struct power_supply *battery;
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struct power_supply_battery_info info;
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};
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static int ingenic_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct ingenic_battery *bat = power_supply_get_drvdata(psy);
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struct power_supply_battery_info *info = &bat->info;
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_HEALTH:
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ret = iio_read_channel_processed(bat->channel, &val->intval);
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val->intval *= 1000;
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if (val->intval < info->voltage_min_design_uv)
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val->intval = POWER_SUPPLY_HEALTH_DEAD;
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else if (val->intval > info->voltage_max_design_uv)
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val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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else
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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return ret;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = iio_read_channel_processed(bat->channel, &val->intval);
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val->intval *= 1000;
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return ret;
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case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
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val->intval = info->voltage_min_design_uv;
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return 0;
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case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
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val->intval = info->voltage_max_design_uv;
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return 0;
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default:
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return -EINVAL;
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2020-11-01 22:09:10 +08:00
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}
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2019-04-19 02:24:04 +08:00
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}
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/* Set the most appropriate IIO channel voltage reference scale
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* based on the battery's max voltage.
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*/
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static int ingenic_battery_set_scale(struct ingenic_battery *bat)
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{
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const int *scale_raw;
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int scale_len, scale_type, best_idx = -1, best_mV, max_raw, i, ret;
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u64 max_mV;
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ret = iio_read_max_channel_raw(bat->channel, &max_raw);
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if (ret) {
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dev_err(bat->dev, "Unable to read max raw channel value\n");
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return ret;
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}
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ret = iio_read_avail_channel_attribute(bat->channel, &scale_raw,
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&scale_type, &scale_len,
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IIO_CHAN_INFO_SCALE);
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if (ret < 0) {
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dev_err(bat->dev, "Unable to read channel avail scale\n");
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return ret;
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}
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if (ret != IIO_AVAIL_LIST || scale_type != IIO_VAL_FRACTIONAL_LOG2)
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return -EINVAL;
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max_mV = bat->info.voltage_max_design_uv / 1000;
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for (i = 0; i < scale_len; i += 2) {
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u64 scale_mV = (max_raw * scale_raw[i]) >> scale_raw[i + 1];
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if (scale_mV < max_mV)
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continue;
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if (best_idx >= 0 && scale_mV > best_mV)
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continue;
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best_mV = scale_mV;
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best_idx = i;
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}
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if (best_idx < 0) {
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dev_err(bat->dev, "Unable to find matching voltage scale\n");
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return -EINVAL;
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}
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2019-11-16 21:56:19 +08:00
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/* Only set scale if there is more than one (fractional) entry */
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if (scale_len > 2) {
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ret = iio_write_channel_attribute(bat->channel,
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scale_raw[best_idx],
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scale_raw[best_idx + 1],
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IIO_CHAN_INFO_SCALE);
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if (ret)
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return ret;
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}
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return 0;
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2019-04-19 02:24:04 +08:00
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}
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static enum power_supply_property ingenic_battery_properties[] = {
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
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};
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static int ingenic_battery_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct ingenic_battery *bat;
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struct power_supply_config psy_cfg = {};
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struct power_supply_desc *desc;
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int ret;
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bat = devm_kzalloc(dev, sizeof(*bat), GFP_KERNEL);
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if (!bat)
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return -ENOMEM;
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bat->dev = dev;
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bat->channel = devm_iio_channel_get(dev, "battery");
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if (IS_ERR(bat->channel))
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return PTR_ERR(bat->channel);
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desc = &bat->desc;
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desc->name = "jz-battery";
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desc->type = POWER_SUPPLY_TYPE_BATTERY;
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desc->properties = ingenic_battery_properties;
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desc->num_properties = ARRAY_SIZE(ingenic_battery_properties);
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desc->get_property = ingenic_battery_get_property;
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psy_cfg.drv_data = bat;
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psy_cfg.of_node = dev->of_node;
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bat->battery = devm_power_supply_register(dev, desc, &psy_cfg);
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2020-08-26 22:48:57 +08:00
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if (IS_ERR(bat->battery))
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return dev_err_probe(dev, PTR_ERR(bat->battery),
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"Unable to register battery\n");
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2019-04-19 02:24:04 +08:00
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ret = power_supply_get_battery_info(bat->battery, &bat->info);
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if (ret) {
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dev_err(dev, "Unable to get battery info: %d\n", ret);
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return ret;
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}
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if (bat->info.voltage_min_design_uv < 0) {
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dev_err(dev, "Unable to get voltage min design\n");
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return bat->info.voltage_min_design_uv;
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}
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if (bat->info.voltage_max_design_uv < 0) {
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dev_err(dev, "Unable to get voltage max design\n");
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return bat->info.voltage_max_design_uv;
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}
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return ingenic_battery_set_scale(bat);
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}
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#ifdef CONFIG_OF
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static const struct of_device_id ingenic_battery_of_match[] = {
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{ .compatible = "ingenic,jz4740-battery", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ingenic_battery_of_match);
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#endif
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static struct platform_driver ingenic_battery_driver = {
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.driver = {
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.name = "ingenic-battery",
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.of_match_table = of_match_ptr(ingenic_battery_of_match),
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},
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.probe = ingenic_battery_probe,
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};
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module_platform_driver(ingenic_battery_driver);
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MODULE_DESCRIPTION("Battery driver for Ingenic JZ47xx SoCs");
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MODULE_AUTHOR("Artur Rojek <contact@artur-rojek.eu>");
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MODULE_LICENSE("GPL");
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