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-rw-r--r--target/linux/bcm27xx/patches-5.4/950-0119-Add-rpi-poe-fan-driver.patch577
1 files changed, 0 insertions, 577 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0119-Add-rpi-poe-fan-driver.patch b/target/linux/bcm27xx/patches-5.4/950-0119-Add-rpi-poe-fan-driver.patch
deleted file mode 100644
index 8a1f57ad01..0000000000
--- a/target/linux/bcm27xx/patches-5.4/950-0119-Add-rpi-poe-fan-driver.patch
+++ /dev/null
@@ -1,577 +0,0 @@
-From 67cfd3ee025f1c47e5921df4bad77d42b1219b67 Mon Sep 17 00:00:00 2001
-From: Serge Schneider <serge@raspberrypi.org>
-Date: Mon, 9 Jul 2018 12:54:25 +0100
-Subject: [PATCH] Add rpi-poe-fan driver
-
-Signed-off-by: Serge Schneider <serge@raspberrypi.org>
-
-PoE HAT driver cleanup
-
-* Fix undeclared variable in rpi_poe_fan_suspend
-* Add SPDX-License-Identifier
-* Expand PoE acronym in Kconfig help
-* Give clearer error message on of_property_count_u32_elems fail
-* Add documentation
-* Add vendor to of_device_id compatible string.
-* Rename m_data_s struct to fw_data_s
-* Fix typos
-
-Fixes: #2665
-
-Signed-off-by: Serge Schneider <serge@raspberrypi.org>
----
- .../devicetree/bindings/hwmon/rpi-poe-fan.txt | 55 +++
- Documentation/hwmon/rpi-poe-fan | 15 +
- drivers/hwmon/Kconfig | 11 +
- drivers/hwmon/Makefile | 1 +
- drivers/hwmon/rpi-poe-fan.c | 436 ++++++++++++++++++
- 5 files changed, 518 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
- create mode 100644 Documentation/hwmon/rpi-poe-fan
- create mode 100644 drivers/hwmon/rpi-poe-fan.c
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/hwmon/rpi-poe-fan.txt
-@@ -0,0 +1,55 @@
-+Bindings for the Raspberry Pi PoE HAT fan
-+
-+Required properties:
-+- compatible : "raspberrypi,rpi-poe-fan"
-+- firmware : Reference to the RPi firmware device node
-+- pwms : the PWM that is used to control the PWM fan
-+- cooling-levels : PWM duty cycle values in a range from 0 to 255
-+ which correspond to thermal cooling states
-+
-+Example:
-+ fan0: rpi-poe-fan@0 {
-+ compatible = "raspberrypi,rpi-poe-fan";
-+ firmware = <&firmware>;
-+ cooling-min-state = <0>;
-+ cooling-max-state = <3>;
-+ #cooling-cells = <2>;
-+ cooling-levels = <0 50 150 255>;
-+ status = "okay";
-+ };
-+
-+ thermal-zones {
-+ cpu_thermal: cpu-thermal {
-+ 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>;
-+ };
-+ };
-+ };
-+ };
---- /dev/null
-+++ b/Documentation/hwmon/rpi-poe-fan
-@@ -0,0 +1,15 @@
-+Kernel driver rpi-poe-fan
-+=====================
-+
-+This driver enables the use of the Raspberry Pi PoE HAT fan.
-+
-+Author: Serge Schneider <serge@raspberrypi.org>
-+
-+Description
-+-----------
-+
-+The driver implements a simple interface for driving the Raspberry Pi PoE
-+(Power over Ethernet) HAT fan. The driver passes commands to the Raspberry Pi
-+firmware through the mailbox property interface. The firmware then forwards
-+the commands to the board over I2C on the ID_EEPROM pins. The driver exposes
-+the fan to the user space through the hwmon sysfs interface.
---- a/drivers/hwmon/Kconfig
-+++ b/drivers/hwmon/Kconfig
-@@ -1356,6 +1356,17 @@ config SENSORS_RASPBERRYPI_HWMON
- This driver can also be built as a module. If so, the module
- will be called raspberrypi-hwmon.
-
-+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 (Power over
-+ Ethernet) 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
-@@ -145,6 +145,7 @@ obj-$(CONFIG_SENSORS_PCF8591) += pcf8591
- obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o
- obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o
- obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.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 +1,436 @@
-+// SPDX-License-Identifier: GPL-2.0
-+/*
-+ * 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>
-+ */
-+
-+#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 fw_tag_data_s{
-+ u32 reg;
-+ u32 val;
-+ u32 ret;
-+};
-+
-+static int write_reg(struct rpi_firmware *fw, u32 reg, u32 *val){
-+ struct fw_tag_data_s fw_tag_data = {
-+ .reg = reg,
-+ .val = *val
-+ };
-+ int ret;
-+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_SET_POE_HAT_VAL,
-+ &fw_tag_data, sizeof(fw_tag_data));
-+ if (ret) {
-+ return ret;
-+ } else if (fw_tag_data.ret) {
-+ return -EIO;
-+ }
-+ return 0;
-+}
-+
-+static int read_reg(struct rpi_firmware *fw, u32 reg, u32 *val){
-+ struct fw_tag_data_s fw_tag_data = {
-+ .reg = reg,
-+ };
-+ int ret;
-+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_POE_HAT_VAL,
-+ &fw_tag_data, sizeof(fw_tag_data));
-+ if (ret) {
-+ return ret;
-+ } else if (fw_tag_data.ret) {
-+ return -EIO;
-+ }
-+ *val = fw_tag_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, "cooling-levels property missing or invalid: %d\n",
-+ ret);
-+ 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;
-+ int ret = 0;
-+
-+ if (ctx->pwm_value != value)
-+ ret = write_reg(ctx->fw, POE_CUR_PWM, &value);
-+ return ret;
-+}
-+
-+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 = "raspberrypi,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");
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-09 07:17:16 +0000