OpenWrt – Rev 1
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From 1f8ba449fabb0eda1d835138d2324f8bc251e8c5 Mon Sep 17 00:00:00 2001
From: Serge Schneider <serge@raspberrypi.org>
Date: Mon, 9 Jul 2018 12:54:25 +0100
Subject: [PATCH 365/454] Add rpi-poe-fan driver
Signed-off-by: Serge Schneider <serge@raspberrypi.org>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 6 +
.../arm/boot/dts/overlays/rpi-poe-overlay.dts | 61 +++
arch/arm/configs/bcm2709_defconfig | 1 +
arch/arm/configs/bcmrpi_defconfig | 1 +
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/rpi-poe-fan.c | 443 ++++++++++++++++++
include/soc/bcm2835/raspberrypi-firmware.h | 2 +
9 files changed, 526 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
create mode 100644 drivers/hwmon/rpi-poe-fan.c
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -103,6 +103,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
rpi-dac.dtbo \
rpi-display.dtbo \
rpi-ft5406.dtbo \
+ rpi-poe.dtbo \
rpi-proto.dtbo \
rpi-sense.dtbo \
rpi-tv.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -1576,6 +1576,12 @@ Params: touchscreen-size-x Touchscr
touchscreen-swapped-x-y Swap X and Y cordinates (default 0);
+Name: rpi-poe
+Info: Raspberry Pi POE HAT
+Load: dtoverlay=rpi-poe
+Params: <None>
+
+
Name: rpi-proto
Info: Configures the RPi Proto audio card
Load: dtoverlay=rpi-proto
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
@@ -0,0 +1,61 @@
+/*
+ * Overlay for the Raspberry Pi POE HAT.
+ */
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target-path = "/";
+ __overlay__ {
+ fan0: rpi-poe-fan@0 {
+ compatible = "rpi-poe-fan";
+ firmware = <&firmware>;
+ cooling-min-state = <0>;
+ cooling-max-state = <3>;
+ #cooling-cells = <2>;
+ cooling-levels = <0 50 150 255>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&cpu_thermal>;
+ __overlay__ {
+ trips {
+ threshold: trip-point@0 {
+ temperature = <45000>;
+ hysteresis = <5000>;
+ type = "active";
+ };
+ target: trip-point@1 {
+ temperature = <50000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+ cpu_hot: cpu_hot@0 {
+ temperature = <55000>;
+ hysteresis = <2000>;
+ type = "active";
+ };
+ };
+ cooling-maps {
+ map0 {
+ trip = <&threshold>;
+ cooling-device = <&fan0 0 1>;
+ };
+ map1 {
+ trip = <&target>;
+ cooling-device = <&fan0 1 2>;
+ };
+ map2 {
+ trip = <&cpu_hot>;
+ cooling-device = <&fan0 2 3>;
+ };
+ };
+ };
+ };
+};
--- a/arch/arm/configs/bcm2709_defconfig
+++ b/arch/arm/configs/bcm2709_defconfig
@@ -658,6 +658,7 @@ CONFIG_HWMON=m
CONFIG_SENSORS_DS1621=m
CONFIG_SENSORS_JC42=m
CONFIG_SENSORS_LM75=m
+CONFIG_SENSORS_RPI_POE_FAN=m
CONFIG_SENSORS_SHT21=m
CONFIG_SENSORS_SHT3x=m
CONFIG_SENSORS_SHTC1=m
--- a/arch/arm/configs/bcmrpi_defconfig
+++ b/arch/arm/configs/bcmrpi_defconfig
@@ -651,6 +651,7 @@ CONFIG_HWMON=m
CONFIG_SENSORS_DS1621=m
CONFIG_SENSORS_JC42=m
CONFIG_SENSORS_LM75=m
+CONFIG_SENSORS_RPI_POE_FAN=m
CONFIG_SENSORS_SHT21=m
CONFIG_SENSORS_SHT3x=m
CONFIG_SENSORS_SHTC1=m
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1286,6 +1286,16 @@ config SENSORS_PWM_FAN
This driver can also be built as a module. If so, the module
will be called pwm-fan.
+config SENSORS_RPI_POE_FAN
+ tristate "Raspberry Pi POE HAT fan"
+ depends on RASPBERRYPI_FIRMWARE
+ depends on THERMAL || THERMAL=n
+ help
+ If you say yes here you get support for Raspberry Pi POE HAT fan.
+
+ This driver can also be built as a module. If so, the module
+ will be called rpi-poe-fan.
+
config SENSORS_SHT15
tristate "Sensiron humidity and temperature sensors. SHT15 and compat."
depends on GPIOLIB || COMPILE_TEST
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -138,6 +138,7 @@ obj-$(CONFIG_SENSORS_PC87427) += pc87427
obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o
obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
+obj-$(CONFIG_SENSORS_RPI_POE_FAN) += rpi-poe-fan.o
obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o
obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o
obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o
--- /dev/null
+++ b/drivers/hwmon/rpi-poe-fan.c
@@ -0,0 +1,443 @@
+/*
+ * rpi-poe-fan.c - Hwmon driver for Raspberry Pi POE HAT fan.
+ *
+ * Copyright (C) 2018 Raspberry Pi (Trading) Ltd.
+ * Based on pwm-fan.c by Kamil Debski <k.debski@samsung.com>
+ *
+ * Author: Serge Schneider <serge@raspberrypi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/sysfs.h>
+#include <linux/thermal.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
+#define MAX_PWM 255
+
+#define POE_CUR_PWM 0x0
+#define POE_DEF_PWM 0x1
+
+struct rpi_poe_fan_ctx {
+ struct mutex lock;
+ struct rpi_firmware *fw;
+ unsigned int pwm_value;
+ unsigned int def_pwm_value;
+ unsigned int rpi_poe_fan_state;
+ unsigned int rpi_poe_fan_max_state;
+ unsigned int *rpi_poe_fan_cooling_levels;
+ struct thermal_cooling_device *cdev;
+ struct notifier_block nb;
+};
+
+struct m_data_s{
+ u32 reg;
+ u32 val;
+ u32 ret;
+};
+
+static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val){
+ struct m_data_s m_data = {
+ .reg = reg,
+ .val = *val
+ };
+ int ret;
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
+ &m_data, sizeof(m_data));
+ if (ret) {
+ return ret;
+ } else if (m_data.ret) {
+ return -EIO;
+ }
+ return 0;
+}
+
+static int read_reg(struct rpi_firmware *fw, u32 reg, u32 *val){
+ struct m_data_s m_data = {
+ .reg = reg,
+ };
+ int ret;
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
+ &m_data, sizeof(m_data));
+ if (ret) {
+ return ret;
+ } else if (m_data.ret) {
+ return -EIO;
+ }
+ *val = m_data.val;
+ return 0;
+}
+
+static int rpi_poe_reboot(struct notifier_block *nb, unsigned long code,
+ void *unused)
+{
+ struct rpi_poe_fan_ctx *ctx = container_of(nb, struct rpi_poe_fan_ctx,
+ nb);
+
+ if (ctx->pwm_value != ctx->def_pwm_value)
+ write_reg(ctx->fw, POE_CUR_PWM, &ctx->def_pwm_value);
+
+ return NOTIFY_DONE;
+}
+
+static int __set_pwm(struct rpi_poe_fan_ctx *ctx, u32 pwm)
+{
+ int ret = 0;
+
+ mutex_lock(&ctx->lock);
+ if (ctx->pwm_value == pwm)
+ goto exit_set_pwm_err;
+
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &pwm);
+ if (!ret)
+ ctx->pwm_value = pwm;
+exit_set_pwm_err:
+ mutex_unlock(&ctx->lock);
+ return ret;
+}
+
+static int __set_def_pwm(struct rpi_poe_fan_ctx *ctx, u32 def_pwm)
+{
+ int ret = 0;
+ mutex_lock(&ctx->lock);
+ if (ctx->def_pwm_value == def_pwm)
+ goto exit_set_def_pwm_err;
+
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &def_pwm);
+ if (!ret)
+ ctx->def_pwm_value = def_pwm;
+exit_set_def_pwm_err:
+ mutex_unlock(&ctx->lock);
+ return ret;
+}
+
+static void rpi_poe_fan_update_state(struct rpi_poe_fan_ctx *ctx,
+ unsigned long pwm)
+{
+ int i;
+
+ for (i = 0; i < ctx->rpi_poe_fan_max_state; ++i)
+ if (pwm < ctx->rpi_poe_fan_cooling_levels[i + 1])
+ break;
+
+ ctx->rpi_poe_fan_state = i;
+}
+
+static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
+ unsigned long pwm;
+ int ret;
+
+ if (kstrtoul(buf, 10, &pwm) || pwm > MAX_PWM)
+ return -EINVAL;
+
+ ret = __set_pwm(ctx, pwm);
+ if (ret)
+ return ret;
+
+ rpi_poe_fan_update_state(ctx, pwm);
+ return count;
+}
+
+static ssize_t set_def_pwm(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
+ unsigned long def_pwm;
+ int ret;
+
+ if (kstrtoul(buf, 10, &def_pwm) || def_pwm > MAX_PWM)
+ return -EINVAL;
+
+ ret = __set_def_pwm(ctx, def_pwm);
+ if (ret)
+ return ret;
+ return count;
+}
+
+static ssize_t show_pwm(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", ctx->pwm_value);
+}
+
+static ssize_t show_def_pwm(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", ctx->def_pwm_value);
+}
+
+
+static SENSOR_DEVICE_ATTR(pwm1, 0644, show_pwm, set_pwm, 0);
+static SENSOR_DEVICE_ATTR(def_pwm1, 0644, show_def_pwm, set_def_pwm, 1);
+
+static struct attribute *rpi_poe_fan_attrs[] = {
+ &sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_def_pwm1.dev_attr.attr,
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(rpi_poe_fan);
+
+/* thermal cooling device callbacks */
+static int rpi_poe_fan_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct rpi_poe_fan_ctx *ctx = cdev->devdata;
+
+ if (!ctx)
+ return -EINVAL;
+
+ *state = ctx->rpi_poe_fan_max_state;
+
+ return 0;
+}
+
+static int rpi_poe_fan_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct rpi_poe_fan_ctx *ctx = cdev->devdata;
+
+ if (!ctx)
+ return -EINVAL;
+
+ *state = ctx->rpi_poe_fan_state;
+
+ return 0;
+}
+
+static int rpi_poe_fan_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ struct rpi_poe_fan_ctx *ctx = cdev->devdata;
+ int ret;
+
+ if (!ctx || (state > ctx->rpi_poe_fan_max_state))
+ return -EINVAL;
+
+ if (state == ctx->rpi_poe_fan_state)
+ return 0;
+
+ ret = __set_pwm(ctx, ctx->rpi_poe_fan_cooling_levels[state]);
+ if (ret) {
+ dev_err(&cdev->device, "Cannot set pwm!\n");
+ return ret;
+ }
+
+ ctx->rpi_poe_fan_state = state;
+
+ return ret;
+}
+
+static const struct thermal_cooling_device_ops rpi_poe_fan_cooling_ops = {
+ .get_max_state = rpi_poe_fan_get_max_state,
+ .get_cur_state = rpi_poe_fan_get_cur_state,
+ .set_cur_state = rpi_poe_fan_set_cur_state,
+};
+
+static int rpi_poe_fan_of_get_cooling_data(struct device *dev,
+ struct rpi_poe_fan_ctx *ctx)
+{
+ struct device_node *np = dev->of_node;
+ int num, i, ret;
+
+ if (!of_find_property(np, "cooling-levels", NULL))
+ return 0;
+
+ ret = of_property_count_u32_elems(np, "cooling-levels");
+ if (ret <= 0) {
+ dev_err(dev, "Wrong data!\n");
+ return ret ? : -EINVAL;
+ }
+
+ num = ret;
+ ctx->rpi_poe_fan_cooling_levels = devm_kzalloc(dev, num * sizeof(u32),
+ GFP_KERNEL);
+ if (!ctx->rpi_poe_fan_cooling_levels)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, "cooling-levels",
+ ctx->rpi_poe_fan_cooling_levels, num);
+ if (ret) {
+ dev_err(dev, "Property 'cooling-levels' cannot be read!\n");
+ return ret;
+ }
+
+ for (i = 0; i < num; i++) {
+ if (ctx->rpi_poe_fan_cooling_levels[i] > MAX_PWM) {
+ dev_err(dev, "PWM fan state[%d]:%d > %d\n", i,
+ ctx->rpi_poe_fan_cooling_levels[i], MAX_PWM);
+ return -EINVAL;
+ }
+ }
+
+ ctx->rpi_poe_fan_max_state = num - 1;
+
+ return 0;
+}
+
+static int rpi_poe_fan_probe(struct platform_device *pdev)
+{
+ struct thermal_cooling_device *cdev;
+ struct rpi_poe_fan_ctx *ctx;
+ struct device *hwmon;
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *fw_node;
+ int ret;
+
+ fw_node = of_parse_phandle(np, "firmware", 0);
+ if (!fw_node) {
+ dev_err(&pdev->dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+
+ ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ mutex_init(&ctx->lock);
+
+ ctx->fw = rpi_firmware_get(fw_node);
+ if (!ctx->fw)
+ return -EPROBE_DEFER;
+
+ platform_set_drvdata(pdev, ctx);
+
+ ctx->nb.notifier_call = rpi_poe_reboot;
+ ret = register_reboot_notifier(&ctx->nb);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register reboot notifier: %i\n",
+ ret);
+ return ret;
+ }
+ ret = read_reg(ctx->fw, POE_DEF_PWM, &ctx->def_pwm_value);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get default PWM value: %i\n",
+ ret);
+ goto err;
+ }
+ ret = read_reg(ctx->fw, POE_CUR_PWM, &ctx->pwm_value);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to get current PWM value: %i\n",
+ ret);
+ goto err;
+ }
+
+ hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, "rpipoefan",
+ ctx, rpi_poe_fan_groups);
+ if (IS_ERR(hwmon)) {
+ dev_err(&pdev->dev, "Failed to register hwmon device\n");
+ ret = PTR_ERR(hwmon);
+ goto err;
+ }
+
+ ret = rpi_poe_fan_of_get_cooling_data(&pdev->dev, ctx);
+ if (ret)
+ return ret;
+
+ rpi_poe_fan_update_state(ctx, ctx->pwm_value);
+ if (!IS_ENABLED(CONFIG_THERMAL))
+ return 0;
+
+ cdev = thermal_of_cooling_device_register(np,
+ "rpi-poe-fan", ctx,
+ &rpi_poe_fan_cooling_ops);
+ if (IS_ERR(cdev)) {
+ dev_err(&pdev->dev,
+ "Failed to register rpi-poe-fan as cooling device");
+ ret = PTR_ERR(cdev);
+ goto err;
+ }
+ ctx->cdev = cdev;
+ thermal_cdev_update(cdev);
+
+ return 0;
+err:
+ unregister_reboot_notifier(&ctx->nb);
+ return ret;
+}
+
+static int rpi_poe_fan_remove(struct platform_device *pdev)
+{
+ struct rpi_poe_fan_ctx *ctx = platform_get_drvdata(pdev);
+ u32 value = ctx->def_pwm_value;
+
+ unregister_reboot_notifier(&ctx->nb);
+ thermal_cooling_device_unregister(ctx->cdev);
+ if (ctx->pwm_value != value) {
+ write_reg(ctx->fw, POE_CUR_PWM, &value);
+ }
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rpi_poe_fan_suspend(struct device *dev)
+{
+ struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
+ u32 value = 0;
+
+ if (ctx->pwm_value != value)
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &value);
+ return 0;
+}
+
+static int rpi_poe_fan_resume(struct device *dev)
+{
+ struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
+ u32 value = ctx->pwm_value;
+ int ret = 0;
+
+ if (value != 0)
+ ret = write_reg(ctx->fw, POE_CUR_PWM, &value);
+
+ return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(rpi_poe_fan_pm, rpi_poe_fan_suspend,
+ rpi_poe_fan_resume);
+
+static const struct of_device_id of_rpi_poe_fan_match[] = {
+ { .compatible = "rpi-poe-fan", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_rpi_poe_fan_match);
+
+static struct platform_driver rpi_poe_fan_driver = {
+ .probe = rpi_poe_fan_probe,
+ .remove = rpi_poe_fan_remove,
+ .driver = {
+ .name = "rpi-poe-fan",
+ .pm = &rpi_poe_fan_pm,
+ .of_match_table = of_rpi_poe_fan_match,
+ },
+};
+
+module_platform_driver(rpi_poe_fan_driver);
+
+MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
+MODULE_ALIAS("platform:rpi-poe-fan");
+MODULE_DESCRIPTION("Raspberry Pi POE HAT fan driver");
+MODULE_LICENSE("GPL");
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -93,6 +93,8 @@ enum rpi_firmware_property_tag {
RPI_FIRMWARE_SET_GPIO_CONFIG = 0x00038043,
RPI_FIRMWARE_GET_PERIPH_REG = 0x00030045,
RPI_FIRMWARE_SET_PERIPH_REG = 0x00038045,
+ RPI_FIRMWARE_GET_POE_HAT_VAL = 0x00030049,
+ RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00030050,
/* Dispmanx TAGS */