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-rw-r--r--drivers/power/reset/gpio-poweroff.c11
-rw-r--r--drivers/power/supply/Kconfig7
-rw-r--r--drivers/power/supply/Makefile1
-rw-r--r--drivers/power/supply/rpi_poe_power.c243
4 files changed, 261 insertions, 1 deletions
diff --git a/drivers/power/reset/gpio-poweroff.c b/drivers/power/reset/gpio-poweroff.c
index 3eaae352ffb9..8df622d4d681 100644
--- a/drivers/power/reset/gpio-poweroff.c
+++ b/drivers/power/reset/gpio-poweroff.c
@@ -61,6 +61,7 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
bool input = false;
enum gpiod_flags flags;
int priority = SYS_OFF_PRIO_DEFAULT;
+ bool export = false;
int ret;
gpio_poweroff = devm_kzalloc(&pdev->dev, sizeof(*gpio_poweroff), GFP_KERNEL);
@@ -92,10 +93,18 @@ static int gpio_poweroff_probe(struct platform_device *pdev)
if (IS_ERR(gpio_poweroff->reset_gpio))
return PTR_ERR(gpio_poweroff->reset_gpio);
+ export = device_property_read_bool(&pdev->dev, "export");
+ if (export) {
+ gpiod_export(gpio_poweroff->reset_gpio, true);
+ gpiod_export_link(&pdev->dev, "poweroff-gpio", gpio_poweroff->reset_gpio);
+ }
+
ret = devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_POWER_OFF,
priority, gpio_poweroff_do_poweroff, gpio_poweroff);
- if (ret)
+ if (ret) {
+ gpiod_unexport(gpio_poweroff->reset_gpio);
return dev_err_probe(&pdev->dev, ret, "Cannot register poweroff handler\n");
+ }
return 0;
}
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index dca4be23ee70..a2c9959144a0 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -28,6 +28,13 @@ config POWER_SUPPLY_HWMON
Say 'Y' here if you want power supplies to
have hwmon sysfs interface too.
+config RPI_POE_POWER
+ tristate "Raspberry Pi PoE+ HAT power supply driver"
+ depends on RASPBERRYPI_FIRMWARE
+ help
+ Say Y here to enable support for Raspberry Pi PoE+ (Power over Ethernet
+ Plus) HAT current measurement.
+
config APM_POWER
tristate "APM emulation for class batteries"
depends on APM_EMULATION
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 99a820d38197..d5ac83876180 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_POWER_SUPPLY_HWMON) += power_supply_hwmon.o
obj-$(CONFIG_ADC_BATTERY_HELPER) += adc-battery-helper.o
obj-$(CONFIG_GENERIC_ADC_BATTERY) += generic-adc-battery.o
+obj-$(CONFIG_RPI_POE_POWER) += rpi_poe_power.o
obj-$(CONFIG_APM_POWER) += apm_power.o
obj-$(CONFIG_AXP20X_POWER) += axp20x_usb_power.o
obj-$(CONFIG_IP5XXX_POWER) += ip5xxx_power.o
diff --git a/drivers/power/supply/rpi_poe_power.c b/drivers/power/supply/rpi_poe_power.c
new file mode 100644
index 000000000000..242da43acccd
--- /dev/null
+++ b/drivers/power/supply/rpi_poe_power.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rpi-poe-power.c - Raspberry Pi PoE+ HAT power supply driver.
+ *
+ * Copyright (C) 2019 Raspberry Pi (Trading) Ltd.
+ * Based on axp20x_ac_power.c by Quentin Schulz <[email protected]>
+ *
+ * Author: Serge Schneider <[email protected]>
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
+#define RPI_POE_FW_BASE_REG 0x2
+
+#define RPI_POE_ADC_REG 0x0
+#define RPI_POE_FLAG_REG 0x2
+
+#define RPI_POE_FLAG_AT BIT(0)
+#define RPI_POE_FLAG_OC BIT(1)
+
+#define RPI_POE_CURRENT_AF_MAX (2500 * 1000)
+#define RPI_POE_CURRENT_AT_MAX (5000 * 1000)
+
+#define DRVNAME "rpi-poe-power-supply"
+
+struct rpi_poe_power_supply_ctx {
+ struct rpi_firmware *fw;
+
+ struct regmap *regmap;
+ u32 offset;
+
+ struct power_supply *supply;
+};
+
+struct fw_tag_data_s {
+ u32 reg;
+ u32 val;
+ u32 ret;
+};
+
+static int write_reg(struct rpi_poe_power_supply_ctx *ctx, u32 reg, u32 *val)
+{
+ struct fw_tag_data_s fw_tag_data = {
+ .reg = reg + RPI_POE_FW_BASE_REG,
+ .val = *val
+ };
+ int ret;
+
+ if (ctx->fw) {
+ ret = rpi_firmware_property(ctx->fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
+ &fw_tag_data, sizeof(fw_tag_data));
+ if (!ret && fw_tag_data.ret)
+ ret = -EIO;
+ } else {
+ ret = regmap_write(ctx->regmap, ctx->offset + reg, *val);
+ }
+
+ return ret;
+}
+
+static int read_reg(struct rpi_poe_power_supply_ctx *ctx, u32 reg, u32 *val)
+{
+ struct fw_tag_data_s fw_tag_data = {
+ .reg = reg + RPI_POE_FW_BASE_REG,
+ .val = *val
+ };
+ u32 value;
+ int ret;
+
+ if (ctx->fw) {
+ ret = rpi_firmware_property(ctx->fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
+ &fw_tag_data, sizeof(fw_tag_data));
+ if (!ret && fw_tag_data.ret)
+ ret = -EIO;
+ *val = fw_tag_data.val;
+ } else {
+ ret = regmap_read(ctx->regmap, ctx->offset + reg, &value);
+ if (!ret) {
+ *val = value;
+ ret = regmap_read(ctx->regmap, ctx->offset + reg + 1, &value);
+ *val |= value << 8;
+ }
+ }
+
+ return ret;
+}
+
+static int rpi_poe_power_supply_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *r_val)
+{
+ struct rpi_poe_power_supply_ctx *ctx = power_supply_get_drvdata(psy);
+ int ret;
+ unsigned int val = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_HEALTH:
+ ret = read_reg(ctx, RPI_POE_FLAG_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val & RPI_POE_FLAG_OC) {
+ r_val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+ val = RPI_POE_FLAG_OC;
+ ret = write_reg(ctx, RPI_POE_FLAG_REG, &val);
+ if (ret)
+ return ret;
+ return 0;
+ }
+
+ r_val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ return 0;
+
+ case POWER_SUPPLY_PROP_ONLINE:
+ ret = read_reg(ctx, RPI_POE_ADC_REG, &val);
+ if (ret)
+ return ret;
+
+ r_val->intval = (val > 5);
+ return 0;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = read_reg(ctx, RPI_POE_ADC_REG, &val);
+ if (ret)
+ return ret;
+ val = (val * 3300)/9821;
+ r_val->intval = val * 1000;
+ return 0;
+
+ case POWER_SUPPLY_PROP_CURRENT_MAX:
+ ret = read_reg(ctx, RPI_POE_FLAG_REG, &val);
+ if (ret)
+ return ret;
+
+ if (val & RPI_POE_FLAG_AT)
+ r_val->intval = RPI_POE_CURRENT_AT_MAX;
+ else
+ r_val->intval = RPI_POE_CURRENT_AF_MAX;
+ return 0;
+
+ default:
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+static enum power_supply_property rpi_poe_power_supply_properties[] = {
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_MAX,
+};
+
+static const struct power_supply_desc rpi_poe_power_supply_desc = {
+ .name = "rpi-poe",
+ .type = POWER_SUPPLY_TYPE_MAINS,
+ .properties = rpi_poe_power_supply_properties,
+ .num_properties = ARRAY_SIZE(rpi_poe_power_supply_properties),
+ .get_property = rpi_poe_power_supply_get_property,
+};
+
+static int rpi_poe_power_supply_probe(struct platform_device *pdev)
+{
+ struct power_supply_config psy_cfg = {};
+ struct rpi_poe_power_supply_ctx *ctx;
+ struct device_node *fw_node;
+ u32 revision;
+
+ if (!of_device_is_available(pdev->dev.of_node))
+ return -ENODEV;
+
+ ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ if (pdev->dev.parent)
+ ctx->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+
+ if (ctx->regmap) {
+ if (device_property_read_u32(&pdev->dev, "reg", &ctx->offset))
+ return -EINVAL;
+ } else {
+ fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
+ if (!fw_node) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+
+ ctx->fw = rpi_firmware_get(fw_node);
+ if (!ctx->fw)
+ return -EPROBE_DEFER;
+ if (rpi_firmware_property(ctx->fw,
+ RPI_FIRMWARE_GET_FIRMWARE_REVISION,
+ &revision, sizeof(revision))) {
+ dev_err(&pdev->dev, "Failed to get firmware revision\n");
+ return -ENOENT;
+ }
+ if (revision < 0x60af72e8) {
+ dev_err(&pdev->dev, "Unsupported firmware\n");
+ return -ENOENT;
+ }
+ }
+
+ platform_set_drvdata(pdev, ctx);
+
+ psy_cfg.fwnode = dev_fwnode(&pdev->dev);
+ psy_cfg.drv_data = ctx;
+
+ ctx->supply = devm_power_supply_register(&pdev->dev,
+ &rpi_poe_power_supply_desc,
+ &psy_cfg);
+ if (IS_ERR(ctx->supply))
+ return PTR_ERR(ctx->supply);
+
+ return 0;
+}
+
+static const struct of_device_id of_rpi_poe_power_supply_match[] = {
+ { .compatible = "raspberrypi,rpi-poe-power-supply", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_rpi_poe_power_supply_match);
+
+static struct platform_driver rpi_poe_power_supply_driver = {
+ .probe = rpi_poe_power_supply_probe,
+ .driver = {
+ .name = DRVNAME,
+ .of_match_table = of_rpi_poe_power_supply_match
+ },
+};
+
+module_platform_driver(rpi_poe_power_supply_driver);
+
+MODULE_AUTHOR("Serge Schneider <[email protected]>");
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_DESCRIPTION("Raspberry Pi PoE+ HAT power supply driver");
+MODULE_LICENSE("GPL");
generated by cgit (git 2.51.2) at 2025-12-03 13:52:56 +0000