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Add Raspberry Pi PoE+ HAT support
Signed-off-by: Serge Schneider <serge@raspberrypi.com>
This commit is contained in:
Serge Schneider
committed by
Dom Cobley
Dom Cobley
parent
6755219c1e
commit
866e574760
@@ -28,6 +28,13 @@ config POWER_SUPPLY_HWMON
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Say 'Y' here if you want power supplies to
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have hwmon sysfs interface too.
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config RPI_POE_POWER
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tristate "Raspberry Pi PoE+ HAT power supply driver"
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depends on RASPBERRYPI_FIRMWARE
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help
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Say Y here to enable support for Raspberry Pi PoE+ (Power over Ethernet
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Plus) HAT current measurement.
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config APM_POWER
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tristate "APM emulation for class batteries"
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depends on APM_EMULATION
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@@ -9,6 +9,7 @@ obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
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obj-$(CONFIG_POWER_SUPPLY_HWMON) += power_supply_hwmon.o
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obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
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obj-$(CONFIG_RPI_POE_POWER) += rpi_poe_power.o
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obj-$(CONFIG_APM_POWER) += apm_power.o
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obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o
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obj-$(CONFIG_IP5XXX_POWER) += ip5xxx_power.o
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227
drivers/power/supply/rpi_poe_power.c
Normal file
227
drivers/power/supply/rpi_poe_power.c
Normal file
@@ -0,0 +1,227 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* rpi-poe-power.c - Raspberry Pi PoE+ HAT power supply driver.
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*
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* Copyright (C) 2019 Raspberry Pi (Trading) Ltd.
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* Based on axp20x_ac_power.c by Quentin Schulz <quentin.schulz@free-electrons.com>
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*
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* Author: Serge Schneider <serge@raspberrypi.org>
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*/
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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 <soc/bcm2835/raspberrypi-firmware.h>
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#define RPI_POE_ADC_REG 0x2
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#define RPI_POE_FLAG_REG 0x4
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#define RPI_POE_FLAG_AT BIT(0)
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#define RPI_POE_FLAG_OC BIT(1)
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#define RPI_POE_CURRENT_AF_MAX (2500 * 1000)
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#define RPI_POE_CURRENT_AT_MAX (5000 * 1000)
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#define DRVNAME "rpi-poe-power-supply"
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struct rpi_poe_power_supply_ctx {
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struct power_supply *supply;
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struct rpi_firmware *fw;
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};
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struct fw_tag_data_s {
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u32 reg;
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u32 val;
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u32 ret;
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};
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static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val)
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{
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struct fw_tag_data_s fw_tag_data = {
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.reg = reg,
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.val = *val
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};
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int ret;
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ret = rpi_firmware_property(fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
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&fw_tag_data, sizeof(fw_tag_data));
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if (ret)
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return ret;
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else if (fw_tag_data.ret)
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return -EIO;
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return 0;
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}
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static int read_reg(struct rpi_firmware *fw, u32 reg, u32 *val)
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{
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struct fw_tag_data_s fw_tag_data = {
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.reg = reg,
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.val = *val
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};
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int ret;
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ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
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&fw_tag_data, sizeof(fw_tag_data));
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if (ret)
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return ret;
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else if (fw_tag_data.ret)
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return -EIO;
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*val = fw_tag_data.val;
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return 0;
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}
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static int rpi_poe_power_supply_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *r_val)
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{
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struct rpi_poe_power_supply_ctx *ctx = power_supply_get_drvdata(psy);
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int ret;
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unsigned int val = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_HEALTH:
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ret = read_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
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if (ret)
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return ret;
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if (val & RPI_POE_FLAG_OC) {
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r_val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
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val = RPI_POE_FLAG_OC;
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ret = write_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
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if (ret)
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return ret;
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return 0;
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}
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r_val->intval = POWER_SUPPLY_HEALTH_GOOD;
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return 0;
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case POWER_SUPPLY_PROP_ONLINE:
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ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
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if (ret)
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return ret;
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r_val->intval = (val > 5);
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return 0;
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case POWER_SUPPLY_PROP_CURRENT_AVG:
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val = 50;
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ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
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if (ret)
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return ret;
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val = (val * 3300)/9821;
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r_val->intval = val * 1000;
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return 0;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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ret = read_reg(ctx->fw, RPI_POE_ADC_REG, &val);
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if (ret)
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return ret;
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val = (val * 3300)/9821;
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r_val->intval = val * 1000;
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return 0;
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case POWER_SUPPLY_PROP_CURRENT_MAX:
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ret = read_reg(ctx->fw, RPI_POE_FLAG_REG, &val);
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if (ret)
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return ret;
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if (val & RPI_POE_FLAG_AT) {
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r_val->intval = RPI_POE_CURRENT_AT_MAX;
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return 0;
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}
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r_val->intval = RPI_POE_CURRENT_AF_MAX;
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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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return -EINVAL;
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}
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static enum power_supply_property rpi_poe_power_supply_properties[] = {
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_CURRENT_AVG,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CURRENT_MAX,
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};
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static const struct power_supply_desc rpi_poe_power_supply_desc = {
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.name = "rpi-poe",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = rpi_poe_power_supply_properties,
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.num_properties = ARRAY_SIZE(rpi_poe_power_supply_properties),
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.get_property = rpi_poe_power_supply_get_property,
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};
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static int rpi_poe_power_supply_probe(struct platform_device *pdev)
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{
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struct power_supply_config psy_cfg = {};
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struct rpi_poe_power_supply_ctx *ctx;
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struct device_node *fw_node;
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u32 revision;
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if (!of_device_is_available(pdev->dev.of_node))
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return -ENODEV;
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fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
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if (!fw_node) {
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dev_err(&pdev->dev, "Missing firmware node\n");
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return -ENOENT;
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}
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ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->fw = rpi_firmware_get(fw_node);
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if (!ctx->fw)
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return -EPROBE_DEFER;
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if (rpi_firmware_property(ctx->fw,
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RPI_FIRMWARE_GET_FIRMWARE_REVISION,
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&revision, sizeof(revision))) {
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dev_err(&pdev->dev, "Failed to get firmware revision\n");
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return -ENOENT;
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}
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if (revision < 0x60af72e8) {
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dev_err(&pdev->dev, "Unsupported firmware\n");
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return -ENOENT;
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}
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platform_set_drvdata(pdev, ctx);
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psy_cfg.of_node = pdev->dev.of_node;
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psy_cfg.drv_data = ctx;
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ctx->supply = devm_power_supply_register(&pdev->dev,
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&rpi_poe_power_supply_desc,
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&psy_cfg);
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if (IS_ERR(ctx->supply))
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return PTR_ERR(ctx->supply);
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return 0;
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}
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static const struct of_device_id of_rpi_poe_power_supply_match[] = {
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{ .compatible = "raspberrypi,rpi-poe-power-supply", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, of_rpi_poe_power_supply_match);
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static struct platform_driver rpi_poe_power_supply_driver = {
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.probe = rpi_poe_power_supply_probe,
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.driver = {
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.name = DRVNAME,
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.of_match_table = of_rpi_poe_power_supply_match
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},
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};
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module_platform_driver(rpi_poe_power_supply_driver);
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MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
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MODULE_ALIAS("platform:" DRVNAME);
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MODULE_DESCRIPTION("Raspberry Pi PoE+ HAT power supply driver");
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MODULE_LICENSE("GPL");
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