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245 lines
7.1 KiB
245 lines
7.1 KiB
From 97a6a1f61eb949892457a739435fd5280fc800f8 Mon Sep 17 00:00:00 2001
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From: XECDesign <XECDesign@users.noreply.github.com>
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Date: Wed, 29 Aug 2018 15:08:30 +0100
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Subject: [PATCH 412/454] PoE HAT driver cleanup
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* Fix undeclared variable in rpi_poe_fan_suspend
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* Add SPDX-License-Identifier
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* Expand PoE acronym in Kconfig help
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* Give clearer error message on of_property_count_u32_elems fail
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* Add documentation
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* Add vendor to of_device_id compatible string.
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* Rename m_data_s struct to fw_data_s
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* Fix typos
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Fixes: #2665
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Signed-off-by: Serge Schneider <serge@raspberrypi.org>
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---
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.../devicetree/bindings/hwmon/rpi-poe-fan.txt | 55 +++++++++++++++++++
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Documentation/hwmon/rpi-poe-fan | 15 +++++
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.../arm/boot/dts/overlays/rpi-poe-overlay.dts | 2 +-
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drivers/hwmon/Kconfig | 5 +-
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drivers/hwmon/rpi-poe-fan.c | 39 ++++++-------
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5 files changed, 90 insertions(+), 26 deletions(-)
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create mode 100644 Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
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create mode 100644 Documentation/hwmon/rpi-poe-fan
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
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@@ -0,0 +1,55 @@
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+Bindings for the Raspberry Pi PoE HAT fan
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+
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+Required properties:
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+- compatible : "raspberrypi,rpi-poe-fan"
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+- firmware : Reference to the RPi firmware device node
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+- pwms : the PWM that is used to control the PWM fan
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+- cooling-levels : PWM duty cycle values in a range from 0 to 255
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+ which correspond to thermal cooling states
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+
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+Example:
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+ fan0: rpi-poe-fan@0 {
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+ compatible = "raspberrypi,rpi-poe-fan";
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+ firmware = <&firmware>;
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+ cooling-min-state = <0>;
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+ cooling-max-state = <3>;
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+ #cooling-cells = <2>;
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+ cooling-levels = <0 50 150 255>;
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+ status = "okay";
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+ };
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+
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+ thermal-zones {
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+ cpu_thermal: cpu-thermal {
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+ trips {
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+ threshold: trip-point@0 {
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+ temperature = <45000>;
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+ hysteresis = <5000>;
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+ type = "active";
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+ };
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+ target: trip-point@1 {
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+ temperature = <50000>;
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+ hysteresis = <2000>;
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+ type = "active";
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+ };
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+ cpu_hot: cpu_hot@0 {
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+ temperature = <55000>;
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+ hysteresis = <2000>;
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+ type = "active";
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+ };
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+ };
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+ cooling-maps {
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+ map0 {
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+ trip = <&threshold>;
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+ cooling-device = <&fan0 0 1>;
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+ };
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+ map1 {
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+ trip = <&target>;
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+ cooling-device = <&fan0 1 2>;
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+ };
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+ map2 {
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+ trip = <&cpu_hot>;
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+ cooling-device = <&fan0 2 3>;
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+ };
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+ };
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+ };
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+ };
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--- /dev/null
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+++ b/Documentation/hwmon/rpi-poe-fan
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@@ -0,0 +1,15 @@
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+Kernel driver rpi-poe-fan
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+=====================
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+
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+This driver enables the use of the Raspberry Pi PoE HAT fan.
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+
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+Author: Serge Schneider <serge@raspberrypi.org>
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+
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+Description
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+-----------
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+
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+The driver implements a simple interface for driving the Raspberry Pi PoE
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+(Power over Ethernet) HAT fan. The driver passes commands to the Raspberry Pi
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+firmware through the mailbox property interface. The firmware then forwards
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+the commands to the board over I2C on the ID_EEPROM pins. The driver exposes
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+the fan to the user space through the hwmon sysfs interface.
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--- a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
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@@ -11,7 +11,7 @@
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target-path = "/";
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__overlay__ {
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fan0: rpi-poe-fan@0 {
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- compatible = "rpi-poe-fan";
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+ compatible = "raspberrypi,rpi-poe-fan";
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firmware = <&firmware>;
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cooling-min-state = <0>;
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cooling-max-state = <3>;
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--- a/drivers/hwmon/Kconfig
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+++ b/drivers/hwmon/Kconfig
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@@ -1287,11 +1287,12 @@ config SENSORS_PWM_FAN
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will be called pwm-fan.
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config SENSORS_RPI_POE_FAN
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- tristate "Raspberry Pi POE HAT fan"
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+ tristate "Raspberry Pi PoE HAT fan"
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depends on RASPBERRYPI_FIRMWARE
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depends on THERMAL || THERMAL=n
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help
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- If you say yes here you get support for Raspberry Pi POE HAT fan.
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+ If you say yes here you get support for Raspberry Pi PoE (Power over
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+ Ethernet) HAT fan.
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This driver can also be built as a module. If so, the module
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will be called rpi-poe-fan.
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--- a/drivers/hwmon/rpi-poe-fan.c
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+++ b/drivers/hwmon/rpi-poe-fan.c
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@@ -1,20 +1,11 @@
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+// SPDX-License-Identifier: GPL-2.0
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/*
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- * rpi-poe-fan.c - Hwmon driver for Raspberry Pi POE HAT fan.
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+ * rpi-poe-fan.c - Hwmon driver for Raspberry Pi PoE HAT fan.
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*
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* Copyright (C) 2018 Raspberry Pi (Trading) Ltd.
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* Based on pwm-fan.c by Kamil Debski <k.debski@samsung.com>
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*
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* Author: Serge Schneider <serge@raspberrypi.org>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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- * GNU General Public License for more details.
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*/
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#include <linux/hwmon.h>
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@@ -46,41 +37,41 @@ struct rpi_poe_fan_ctx {
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struct notifier_block nb;
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};
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-struct m_data_s{
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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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- struct m_data_s m_data = {
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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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- &m_data, sizeof(m_data));
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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 (m_data.ret) {
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+ } else if (fw_tag_data.ret) {
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return -EIO;
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}
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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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- struct m_data_s m_data = {
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+ struct fw_tag_data_s fw_tag_data = {
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.reg = reg,
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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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- &m_data, sizeof(m_data));
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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 (m_data.ret) {
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+ } else if (fw_tag_data.ret) {
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return -EIO;
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}
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- *val = m_data.val;
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+ *val = fw_tag_data.val;
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return 0;
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}
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@@ -268,7 +259,8 @@ static int rpi_poe_fan_of_get_cooling_da
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ret = of_property_count_u32_elems(np, "cooling-levels");
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if (ret <= 0) {
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- dev_err(dev, "Wrong data!\n");
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+ dev_err(dev, "cooling-levels property missing or invalid: %d\n",
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+ ret);
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return ret ? : -EINVAL;
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}
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@@ -397,10 +389,11 @@ static int rpi_poe_fan_suspend(struct de
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{
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struct rpi_poe_fan_ctx *ctx = dev_get_drvdata(dev);
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u32 value = 0;
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+ int ret = 0;
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if (ctx->pwm_value != value)
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ret = write_reg(ctx->fw, POE_CUR_PWM, &value);
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- return 0;
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+ return ret;
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}
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static int rpi_poe_fan_resume(struct device *dev)
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@@ -420,7 +413,7 @@ static SIMPLE_DEV_PM_OPS(rpi_poe_fan_pm,
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rpi_poe_fan_resume);
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static const struct of_device_id of_rpi_poe_fan_match[] = {
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- { .compatible = "rpi-poe-fan", },
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+ { .compatible = "raspberrypi,rpi-poe-fan", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_rpi_poe_fan_match);
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@@ -439,5 +432,5 @@ module_platform_driver(rpi_poe_fan_drive
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MODULE_AUTHOR("Serge Schneider <serge@raspberrypi.org>");
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MODULE_ALIAS("platform:rpi-poe-fan");
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-MODULE_DESCRIPTION("Raspberry Pi POE HAT fan driver");
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+MODULE_DESCRIPTION("Raspberry Pi PoE HAT fan driver");
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MODULE_LICENSE("GPL");
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