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Date: Tue, 21 Apr 2020 10:00:57 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: lee.jones@...aro.org, jdelvare@...e.com, linux@...ck-us.net,
srinivas.kandagatla@...aro.org
Cc: nick@...das.com, art@...das.com,
Neil Armstrong <narmstrong@...libre.com>,
linux-amlogic@...ts.infradead.org, linux-hwmon@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC 3/8] hwmon: add support for the MCU controlled FAN on Khadas boards
The new Khadas VIM2 and VIM3 boards controls the cooling fan via the
on-board microcontroller.
This implements the FAN control as HWMON devices as cell of the Khadas
MCU MFD driver.
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
drivers/hwmon/Kconfig | 9 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/khadas-mcu-fan.c | 230 +++++++++++++++++++++++++++++++++
3 files changed, 240 insertions(+)
create mode 100644 drivers/hwmon/khadas-mcu-fan.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 4c62f900bf7e..7f63ff7bb732 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1997,6 +1997,15 @@ config SENSORS_XGENE
If you say yes here you get support for the temperature
and power sensors for APM X-Gene SoC.
+config SENSORS_KHADAS_MCU_FAN
+ tristate "Khadas MCU controller FAN driver"
+ depends on OF || COMPILE_TEST
+ select MFD_CORE
+ select REGMAP
+ help
+ If you say yes here you get support for the FAN controlled
+ by the Microcontroller found on the Khadas VIM boards.
+
if ACPI
comment "ACPI drivers"
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index b0b9c8e57176..20db40f6d57f 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -185,6 +185,7 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
obj-$(CONFIG_SENSORS_XGENE) += xgene-hwmon.o
+obj-$(CONFIG_SENSORS_KHADAS_MCU_FAN) += khadas-mcu-fan.o
obj-$(CONFIG_SENSORS_OCC) += occ/
obj-$(CONFIG_PMBUS) += pmbus/
diff --git a/drivers/hwmon/khadas-mcu-fan.c b/drivers/hwmon/khadas-mcu-fan.c
new file mode 100644
index 000000000000..dd92b2bcb7e3
--- /dev/null
+++ b/drivers/hwmon/khadas-mcu-fan.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Khadas MCU Controlled FAN driver
+ *
+ * Copyright (C) 2020 BayLibre SAS
+ * Author(s): Neil Armstrong <narmstrong@...libre.com>
+ */
+
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/mfd/khadas-mcu.h>
+#include <linux/regmap.h>
+#include <linux/sysfs.h>
+#include <linux/thermal.h>
+
+#define MAX_LEVEL 3
+
+struct khadas_mcu_fan_ctx {
+ struct khadas_mcu *mcu;
+ unsigned int level;
+ struct thermal_cooling_device *cdev;
+};
+
+static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx,
+ unsigned int level)
+{
+ int ret;
+
+ ret = regmap_write(ctx->mcu->map, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG,
+ level);
+ if (ret)
+ return ret;
+
+ ctx->level = level;
+
+ return 0;
+}
+
+static ssize_t level_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
+ unsigned long level;
+ int ret;
+
+ if (kstrtoul(buf, 10, &level) || level > MAX_LEVEL)
+ return -EINVAL;
+
+ ret = khadas_mcu_fan_set_level(ctx, level);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static ssize_t level_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", ctx->level);
+}
+
+static SENSOR_DEVICE_ATTR_RW(level1, level, 0);
+
+static struct attribute *khadas_mcu_fan_attrs[] = {
+ &sensor_dev_attr_level1.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group khadas_mcu_fan_group = {
+ .attrs = khadas_mcu_fan_attrs,
+};
+
+static const struct attribute_group *khadas_mcu_fan_groups[] = {
+ &khadas_mcu_fan_group,
+ NULL,
+};
+
+/* thermal cooling device callbacks */
+static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
+
+ if (!ctx)
+ return -EINVAL;
+
+ *state = MAX_LEVEL;
+
+ return 0;
+}
+
+static int khadas_mcu_fan_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
+
+ if (!ctx)
+ return -EINVAL;
+
+ *state = ctx->level;
+
+ return 0;
+}
+
+static int
+khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
+
+ if (!ctx || (state > MAX_LEVEL))
+ return -EINVAL;
+
+ if (state == ctx->level)
+ return 0;
+
+ return khadas_mcu_fan_set_level(ctx, state);
+}
+
+static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = {
+ .get_max_state = khadas_mcu_fan_get_max_state,
+ .get_cur_state = khadas_mcu_fan_get_cur_state,
+ .set_cur_state = khadas_mcu_fan_set_cur_state,
+};
+
+static int khadas_mcu_fan_probe(struct platform_device *pdev)
+{
+ struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent);
+ struct thermal_cooling_device *cdev;
+ struct device *dev = &pdev->dev;
+ struct khadas_mcu_fan_ctx *ctx;
+ struct device *hwmon;
+ int ret;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+ ctx->mcu = mcu;
+ platform_set_drvdata(pdev, ctx);
+
+ hwmon = devm_hwmon_device_register_with_groups(dev, "khadas-mcu-fan",
+ ctx,
+ khadas_mcu_fan_groups);
+ if (IS_ERR(hwmon)) {
+ dev_err(dev, "Failed to register hwmon device\n");
+ return PTR_ERR(hwmon);
+ }
+
+ if (IS_ENABLED(CONFIG_THERMAL)) {
+ cdev = devm_thermal_of_cooling_device_register(dev->parent,
+ dev->parent->of_node, "khadas-mcu-fan", ctx,
+ &khadas_mcu_fan_cooling_ops);
+ if (IS_ERR(cdev)) {
+ ret = PTR_ERR(cdev);
+ dev_err(dev,
+ "Failed to register khadas-mcu-fan as cooling device: %d\n",
+ ret);
+ return ret;
+ }
+ ctx->cdev = cdev;
+ thermal_cdev_update(cdev);
+ }
+
+ return 0;
+}
+
+static int khadas_mcu_fan_disable(struct device *dev)
+{
+ struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
+ unsigned int level_save = ctx->level;
+ int ret;
+
+ ret = khadas_mcu_fan_set_level(ctx, 0);
+ if (ret)
+ return ret;
+
+ ctx->level = level_save;
+
+ return 0;
+}
+
+static void khadas_mcu_fan_shutdown(struct platform_device *pdev)
+{
+ khadas_mcu_fan_disable(&pdev->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int khadas_mcu_fan_suspend(struct device *dev)
+{
+ return khadas_mcu_fan_disable(dev);
+}
+
+static int khadas_mcu_fan_resume(struct device *dev)
+{
+ struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
+
+ return khadas_mcu_fan_set_level(ctx, ctx->level);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend,
+ khadas_mcu_fan_resume);
+
+static const struct platform_device_id khadas_mcu_fan_id_table[] = {
+ { .name = "khadas-mcu-fan-ctrl", },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table);
+
+static struct platform_driver khadas_mcu_fan_driver = {
+ .probe = khadas_mcu_fan_probe,
+ .shutdown = khadas_mcu_fan_shutdown,
+ .driver = {
+ .name = "khadas-mcu-fan-ctrl",
+ .pm = &khadas_mcu_fan_pm,
+ },
+ .id_table = khadas_mcu_fan_id_table,
+};
+
+module_platform_driver(khadas_mcu_fan_driver);
+
+MODULE_AUTHOR("Neil Armstrong <narmstrong@...libre.com>");
+MODULE_DESCRIPTION("Khadas MCU FAN driver");
+MODULE_LICENSE("GPL");
--
2.22.0
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