From 9370bb92b2d16684ee45cf24e879c93c509162da Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 19 Dec 2024 01:47:39 +0000
Subject: [PATCH] add wifi6 8852be driver
---
kernel/drivers/hwmon/pwm-fan.c | 364 +++++++++++++++++++++++++++++++++++++++++++---------
1 files changed, 301 insertions(+), 63 deletions(-)
diff --git a/kernel/drivers/hwmon/pwm-fan.c b/kernel/drivers/hwmon/pwm-fan.c
index db0d15c..6298da5 100644
--- a/kernel/drivers/hwmon/pwm-fan.c
+++ b/kernel/drivers/hwmon/pwm-fan.c
@@ -1,42 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* pwm-fan.c - Hwmon driver for fans connected to PWM lines.
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
*
* Author: Kamil Debski <k.debski@samsung.com>
- *
- * 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/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
+#include <linux/regulator/consumer.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
+#include <linux/timer.h>
+#include <soc/rockchip/rockchip_system_monitor.h>
#define MAX_PWM 255
+
+struct thermal_trips {
+ int temp;
+ int state;
+};
struct pwm_fan_ctx {
struct mutex lock;
struct pwm_device *pwm;
+ struct regulator *reg_en;
+
+ int irq;
+ atomic_t pulses;
+ unsigned int rpm;
+ u8 pulses_per_revolution;
+ ktime_t sample_start;
+ struct timer_list rpm_timer;
+
unsigned int pwm_value;
unsigned int pwm_fan_state;
unsigned int pwm_fan_max_state;
unsigned int *pwm_fan_cooling_levels;
struct thermal_cooling_device *cdev;
+ struct notifier_block thermal_nb;
+ struct thermal_trips *thermal_trips;
+ bool thermal_notifier_is_ok;
};
+
+/* This handler assumes self resetting edge triggered interrupt. */
+static irqreturn_t pulse_handler(int irq, void *dev_id)
+{
+ struct pwm_fan_ctx *ctx = dev_id;
+
+ atomic_inc(&ctx->pulses);
+
+ return IRQ_HANDLED;
+}
+
+static void sample_timer(struct timer_list *t)
+{
+ struct pwm_fan_ctx *ctx = from_timer(ctx, t, rpm_timer);
+ unsigned int delta = ktime_ms_delta(ktime_get(), ctx->sample_start);
+ int pulses;
+
+ if (delta) {
+ pulses = atomic_read(&ctx->pulses);
+ atomic_sub(pulses, &ctx->pulses);
+ ctx->rpm = (unsigned int)(pulses * 1000 * 60) /
+ (ctx->pulses_per_revolution * delta);
+
+ ctx->sample_start = ktime_get();
+ }
+
+ mod_timer(&ctx->rpm_timer, jiffies + HZ);
+}
static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
{
@@ -72,8 +112,8 @@
ctx->pwm_fan_state = i;
}
-static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
+static ssize_t pwm_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
unsigned long pwm;
@@ -90,23 +130,53 @@
return count;
}
-static ssize_t show_pwm(struct device *dev,
- struct device_attribute *attr, char *buf)
+static ssize_t pwm_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
return sprintf(buf, "%u\n", ctx->pwm_value);
}
+static ssize_t rpm_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
-static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm, 0);
+ return sprintf(buf, "%u\n", ctx->rpm);
+}
+
+static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
+static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0);
static struct attribute *pwm_fan_attrs[] = {
&sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_fan1_input.dev_attr.attr,
NULL,
};
-ATTRIBUTE_GROUPS(pwm_fan);
+static umode_t pwm_fan_attrs_visible(struct kobject *kobj, struct attribute *a,
+ int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+
+ /* Hide fan_input in case no interrupt is available */
+ if (n == 1 && ctx->irq <= 0)
+ return 0;
+
+ return a->mode;
+}
+
+static const struct attribute_group pwm_fan_group = {
+ .attrs = pwm_fan_attrs,
+ .is_visible = pwm_fan_attrs_visible,
+};
+
+static const struct attribute_group *pwm_fan_groups[] = {
+ &pwm_fan_group,
+ NULL,
+};
/* thermal cooling device callbacks */
static int pwm_fan_get_max_state(struct thermal_cooling_device *cdev,
@@ -205,93 +275,234 @@
return 0;
}
+static void pwm_fan_regulator_disable(void *data)
+{
+ regulator_disable(data);
+}
+
+static void pwm_fan_pwm_disable(void *__ctx)
+{
+ struct pwm_fan_ctx *ctx = __ctx;
+ pwm_disable(ctx->pwm);
+ del_timer_sync(&ctx->rpm_timer);
+}
+
+static int pwm_fan_get_thermal_trips(struct device *dev, char *porp_name,
+ struct thermal_trips **trips)
+{
+ struct device_node *np = dev->of_node;
+ struct thermal_trips *thermal_trips;
+ const struct property *prop;
+ int count, i;
+
+ prop = of_find_property(np, porp_name, NULL);
+ if (!prop)
+ return -EINVAL;
+ if (!prop->value)
+ return -ENODATA;
+ count = of_property_count_u32_elems(np, porp_name);
+ if (count < 0)
+ return -EINVAL;
+ if (count % 2)
+ return -EINVAL;
+ thermal_trips = devm_kzalloc(dev,
+ sizeof(*thermal_trips) * (count / 2 + 1),
+ GFP_KERNEL);
+ if (!thermal_trips)
+ return -ENOMEM;
+
+ for (i = 0; i < count / 2; i++) {
+ of_property_read_u32_index(np, porp_name, 2 * i,
+ &thermal_trips[i].temp);
+ of_property_read_u32_index(np, porp_name, 2 * i + 1,
+ &thermal_trips[i].state);
+ }
+ thermal_trips[i].temp = 0;
+ thermal_trips[i].state = INT_MAX;
+
+ *trips = thermal_trips;
+
+ return 0;
+}
+
+static int pwm_fan_temp_to_state(struct pwm_fan_ctx *ctx, int temp)
+{
+ struct thermal_trips *trips = ctx->thermal_trips;
+ int i, state = 0;
+
+ for (i = 0; trips[i].state != INT_MAX; i++) {
+ if (temp >= trips[i].temp)
+ state = trips[i].state;
+ }
+
+ return state;
+}
+
+static int pwm_fan_thermal_notifier_call(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct pwm_fan_ctx *ctx = container_of(nb, struct pwm_fan_ctx, thermal_nb);
+ struct system_monitor_event_data *event_data = data;
+ int state, ret;
+
+ if (event != SYSTEM_MONITOR_CHANGE_TEMP)
+ return NOTIFY_OK;
+
+ state = pwm_fan_temp_to_state(ctx, event_data->temp);
+ if (state > ctx->pwm_fan_max_state)
+ return NOTIFY_BAD;
+ if (state == ctx->pwm_fan_state)
+ return NOTIFY_OK;
+
+ ret = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[state]);
+ if (ret)
+ return NOTIFY_BAD;
+
+ ctx->pwm_fan_state = state;
+
+ return NOTIFY_OK;
+}
+
+static int pwm_fan_register_thermal_notifier(struct device *dev,
+ struct pwm_fan_ctx *ctx)
+{
+ if (pwm_fan_get_thermal_trips(dev, "rockchip,temp-trips",
+ &ctx->thermal_trips))
+ return -EINVAL;
+
+ ctx->thermal_nb.notifier_call = pwm_fan_thermal_notifier_call;
+
+ return rockchip_system_monitor_register_notifier(&ctx->thermal_nb);
+}
+
static int pwm_fan_probe(struct platform_device *pdev)
{
struct thermal_cooling_device *cdev;
+ struct device *dev = &pdev->dev;
struct pwm_fan_ctx *ctx;
struct device *hwmon;
int ret;
struct pwm_state state = { };
+ u32 ppr = 2;
- ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
mutex_init(&ctx->lock);
- ctx->pwm = devm_of_pwm_get(&pdev->dev, pdev->dev.of_node, NULL);
- if (IS_ERR(ctx->pwm)) {
- ret = PTR_ERR(ctx->pwm);
-
- if (ret != -EPROBE_DEFER)
- dev_err(&pdev->dev, "Could not get PWM: %d\n", ret);
-
- return ret;
- }
+ ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL);
+ if (IS_ERR(ctx->pwm))
+ return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n");
platform_set_drvdata(pdev, ctx);
+ ctx->irq = platform_get_irq_optional(pdev, 0);
+ if (ctx->irq == -EPROBE_DEFER)
+ return ctx->irq;
+
+ ctx->reg_en = devm_regulator_get_optional(dev, "fan");
+ if (IS_ERR(ctx->reg_en)) {
+ if (PTR_ERR(ctx->reg_en) != -ENODEV)
+ return PTR_ERR(ctx->reg_en);
+
+ ctx->reg_en = NULL;
+ } else {
+ ret = regulator_enable(ctx->reg_en);
+ if (ret) {
+ dev_err(dev, "Failed to enable fan supply: %d\n", ret);
+ return ret;
+ }
+ ret = devm_add_action_or_reset(dev, pwm_fan_regulator_disable,
+ ctx->reg_en);
+ if (ret)
+ return ret;
+ }
+
ctx->pwm_value = MAX_PWM;
- /* Set duty cycle to maximum allowed and enable PWM output */
pwm_init_state(ctx->pwm, &state);
+ /*
+ * __set_pwm assumes that MAX_PWM * (period - 1) fits into an unsigned
+ * long. Check this here to prevent the fan running at a too low
+ * frequency.
+ */
+ if (state.period > ULONG_MAX / MAX_PWM + 1) {
+ dev_err(dev, "Configured period too big\n");
+ return -EINVAL;
+ }
+
+ /* Set duty cycle to maximum allowed and enable PWM output */
state.duty_cycle = ctx->pwm->args.period - 1;
state.enabled = true;
ret = pwm_apply_state(ctx->pwm, &state);
if (ret) {
- dev_err(&pdev->dev, "Failed to configure PWM\n");
+ dev_err(dev, "Failed to configure PWM: %d\n", ret);
return ret;
}
+ timer_setup(&ctx->rpm_timer, sample_timer, 0);
+ ret = devm_add_action_or_reset(dev, pwm_fan_pwm_disable, ctx);
+ if (ret)
+ return ret;
- hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, "pwmfan",
- ctx, pwm_fan_groups);
- if (IS_ERR(hwmon)) {
- dev_err(&pdev->dev, "Failed to register hwmon device\n");
- ret = PTR_ERR(hwmon);
- goto err_pwm_disable;
+ of_property_read_u32(dev->of_node, "pulses-per-revolution", &ppr);
+ ctx->pulses_per_revolution = ppr;
+ if (!ctx->pulses_per_revolution) {
+ dev_err(dev, "pulses-per-revolution can't be zero.\n");
+ return -EINVAL;
}
- ret = pwm_fan_of_get_cooling_data(&pdev->dev, ctx);
+ if (ctx->irq > 0) {
+ ret = devm_request_irq(dev, ctx->irq, pulse_handler, 0,
+ pdev->name, ctx);
+ if (ret) {
+ dev_err(dev, "Failed to request interrupt: %d\n", ret);
+ return ret;
+ }
+ ctx->sample_start = ktime_get();
+ mod_timer(&ctx->rpm_timer, jiffies + HZ);
+ }
+
+ hwmon = devm_hwmon_device_register_with_groups(dev, "pwmfan",
+ ctx, pwm_fan_groups);
+ if (IS_ERR(hwmon)) {
+ dev_err(dev, "Failed to register hwmon device\n");
+ return PTR_ERR(hwmon);
+ }
+
+ ret = pwm_fan_of_get_cooling_data(dev, ctx);
if (ret)
- goto err_pwm_disable;
+ return ret;
ctx->pwm_fan_state = ctx->pwm_fan_max_state;
+ if (IS_REACHABLE(CONFIG_ROCKCHIP_SYSTEM_MONITOR) &&
+ of_find_property(dev->of_node, "rockchip,temp-trips", NULL)) {
+ ret = pwm_fan_register_thermal_notifier(dev, ctx);
+ if (ret)
+ dev_err(dev, "Failed to register thermal notifier: %d\n", ret);
+ else
+ ctx->thermal_notifier_is_ok = true;
+ return 0;
+ }
if (IS_ENABLED(CONFIG_THERMAL)) {
- cdev = thermal_of_cooling_device_register(pdev->dev.of_node,
- "pwm-fan", ctx,
- &pwm_fan_cooling_ops);
+ cdev = devm_thermal_of_cooling_device_register(dev,
+ dev->of_node, "pwm-fan", ctx, &pwm_fan_cooling_ops);
if (IS_ERR(cdev)) {
- dev_err(&pdev->dev,
- "Failed to register pwm-fan as cooling device");
ret = PTR_ERR(cdev);
- goto err_pwm_disable;
+ dev_err(dev,
+ "Failed to register pwm-fan as cooling device: %d\n",
+ ret);
+ return ret;
}
ctx->cdev = cdev;
thermal_cdev_update(cdev);
}
return 0;
-
-err_pwm_disable:
- state.enabled = false;
- pwm_apply_state(ctx->pwm, &state);
-
- return ret;
}
-static int pwm_fan_remove(struct platform_device *pdev)
-{
- struct pwm_fan_ctx *ctx = platform_get_drvdata(pdev);
-
- thermal_cooling_device_unregister(ctx->cdev);
- if (ctx->pwm_value)
- pwm_disable(ctx->pwm);
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int pwm_fan_suspend(struct device *dev)
+static int pwm_fan_disable(struct device *dev)
{
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
struct pwm_args args;
@@ -299,7 +510,7 @@
pwm_get_args(ctx->pwm, &args);
- if (ctx->pwm_value) {
+ if (ctx->pwm_value || ctx->thermal_notifier_is_ok) {
ret = pwm_config(ctx->pwm, 0, args.period);
if (ret < 0)
return ret;
@@ -307,7 +518,26 @@
pwm_disable(ctx->pwm);
}
+ if (ctx->reg_en) {
+ ret = regulator_disable(ctx->reg_en);
+ if (ret) {
+ dev_err(dev, "Failed to disable fan supply: %d\n", ret);
+ return ret;
+ }
+ }
+
return 0;
+}
+
+static void pwm_fan_shutdown(struct platform_device *pdev)
+{
+ pwm_fan_disable(&pdev->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pwm_fan_suspend(struct device *dev)
+{
+ return pwm_fan_disable(dev);
}
static int pwm_fan_resume(struct device *dev)
@@ -317,7 +547,15 @@
unsigned long duty;
int ret;
- if (ctx->pwm_value == 0)
+ if (ctx->reg_en) {
+ ret = regulator_enable(ctx->reg_en);
+ if (ret) {
+ dev_err(dev, "Failed to enable fan supply: %d\n", ret);
+ return ret;
+ }
+ }
+
+ if (ctx->pwm_value == 0 && !ctx->thermal_notifier_is_ok)
return 0;
pwm_get_args(ctx->pwm, &pargs);
@@ -339,7 +577,7 @@
static struct platform_driver pwm_fan_driver = {
.probe = pwm_fan_probe,
- .remove = pwm_fan_remove,
+ .shutdown = pwm_fan_shutdown,
.driver = {
.name = "pwm-fan",
.pm = &pwm_fan_pm,
--
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