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190 lines
5.1 KiB
190 lines
5.1 KiB
// 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 <[email protected]> |
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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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} |
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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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/* 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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} |
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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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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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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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