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243 lines
5.7 KiB
243 lines
5.7 KiB
// 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 <[email protected]> |
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* |
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* Author: Serge Schneider <[email protected]> |
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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 <linux/regmap.h> |
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#include <soc/bcm2835/raspberrypi-firmware.h> |
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#define RPI_POE_FW_BASE_REG 0x2 |
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#define RPI_POE_ADC_REG 0x0 |
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#define RPI_POE_FLAG_REG 0x2 |
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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 rpi_firmware *fw; |
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struct regmap *regmap; |
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u32 offset; |
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struct power_supply *supply; |
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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_poe_power_supply_ctx *ctx, 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 + RPI_POE_FW_BASE_REG, |
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.val = *val |
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}; |
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int ret; |
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if (ctx->fw) { |
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ret = rpi_firmware_property(ctx->fw, RPI_FIRMWARE_SET_POE_HAT_VAL, |
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&fw_tag_data, sizeof(fw_tag_data)); |
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if (!ret && fw_tag_data.ret) |
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ret = -EIO; |
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} else { |
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ret = regmap_write(ctx->regmap, ctx->offset + reg, *val); |
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} |
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return ret; |
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} |
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static int read_reg(struct rpi_poe_power_supply_ctx *ctx, 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 + RPI_POE_FW_BASE_REG, |
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.val = *val |
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}; |
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u32 value; |
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int ret; |
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if (ctx->fw) { |
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ret = rpi_firmware_property(ctx->fw, RPI_FIRMWARE_GET_POE_HAT_VAL, |
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&fw_tag_data, sizeof(fw_tag_data)); |
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if (!ret && fw_tag_data.ret) |
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ret = -EIO; |
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*val = fw_tag_data.val; |
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} else { |
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ret = regmap_read(ctx->regmap, ctx->offset + reg, &value); |
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if (!ret) { |
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*val = value; |
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ret = regmap_read(ctx->regmap, ctx->offset + reg + 1, &value); |
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*val |= value << 8; |
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} |
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} |
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return ret; |
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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, 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, 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, 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_NOW: |
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ret = read_reg(ctx, 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, 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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else |
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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_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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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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if (pdev->dev.parent) |
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ctx->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
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if (ctx->regmap) { |
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if (device_property_read_u32(&pdev->dev, "reg", &ctx->offset)) |
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return -EINVAL; |
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} else { |
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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->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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} |
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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 <[email protected]>"); |
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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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