From 61598093bbdd283a7edc367d900f223070ead8d2 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:43:03 +0000
Subject: [PATCH] add ax88772C AX88772C_eeprom_tools
---
kernel/drivers/rtc/class.c | 270 ++++++++++++++++++++---------------------------------
1 files changed, 101 insertions(+), 169 deletions(-)
diff --git a/kernel/drivers/rtc/class.c b/kernel/drivers/rtc/class.c
index 8c0e76e..625effe 100644
--- a/kernel/drivers/rtc/class.c
+++ b/kernel/drivers/rtc/class.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* RTC subsystem, base class
*
@@ -5,11 +6,7 @@
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* class skeleton from drivers/hwmon/hwmon.c
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
+ */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -23,13 +20,22 @@
#include "rtc-core.h"
-
static DEFINE_IDA(rtc_ida);
struct class *rtc_class;
static void rtc_device_release(struct device *dev)
{
struct rtc_device *rtc = to_rtc_device(dev);
+ struct timerqueue_head *head = &rtc->timerqueue;
+ struct timerqueue_node *node;
+
+ mutex_lock(&rtc->ops_lock);
+ while ((node = timerqueue_getnext(head)))
+ timerqueue_del(head, node);
+ mutex_unlock(&rtc->ops_lock);
+
+ cancel_work_sync(&rtc->irqwork);
+
ida_simple_remove(&rtc_ida, rtc->id);
kfree(rtc);
}
@@ -37,6 +43,50 @@
#ifdef CONFIG_RTC_HCTOSYS_DEVICE
/* Result of the last RTC to system clock attempt. */
int rtc_hctosys_ret = -ENODEV;
+
+/* IMPORTANT: the RTC only stores whole seconds. It is arbitrary
+ * whether it stores the most close value or the value with partial
+ * seconds truncated. However, it is important that we use it to store
+ * the truncated value. This is because otherwise it is necessary,
+ * in an rtc sync function, to read both xtime.tv_sec and
+ * xtime.tv_nsec. On some processors (i.e. ARM), an atomic read
+ * of >32bits is not possible. So storing the most close value would
+ * slow down the sync API. So here we have the truncated value and
+ * the best guess is to add 0.5s.
+ */
+
+static void rtc_hctosys(struct rtc_device *rtc)
+{
+ int err;
+ struct rtc_time tm;
+ struct timespec64 tv64 = {
+ .tv_nsec = NSEC_PER_SEC >> 1,
+ };
+
+ err = rtc_read_time(rtc, &tm);
+ if (err) {
+ dev_err(rtc->dev.parent,
+ "hctosys: unable to read the hardware clock\n");
+ goto err_read;
+ }
+
+ tv64.tv_sec = rtc_tm_to_time64(&tm);
+
+#if BITS_PER_LONG == 32
+ if (tv64.tv_sec > INT_MAX) {
+ err = -ERANGE;
+ goto err_read;
+ }
+#endif
+
+ err = do_settimeofday64(&tv64);
+
+ dev_info(rtc->dev.parent, "setting system clock to %ptR UTC (%lld)\n",
+ &tm, (long long)tv64.tv_sec);
+
+err_read:
+ rtc_hctosys_ret = err;
+}
#endif
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_RTC_HCTOSYS_DEVICE)
@@ -46,7 +96,6 @@
*/
static struct timespec64 old_rtc, old_system, old_delta;
-
static int rtc_suspend(struct device *dev)
{
@@ -71,7 +120,6 @@
ktime_get_real_ts64(&old_system);
old_rtc.tv_sec = rtc_tm_to_time64(&tm);
-
/*
* To avoid drift caused by repeated suspend/resumes,
* which each can add ~1 second drift error,
@@ -83,7 +131,7 @@
if (delta_delta.tv_sec < -2 || delta_delta.tv_sec >= 2) {
/*
* if delta_delta is too large, assume time correction
- * has occured and set old_delta to the current delta.
+ * has occurred and set old_delta to the current delta.
*/
old_delta = delta;
} else {
@@ -136,7 +184,7 @@
* to keep things accurate.
*/
sleep_time = timespec64_sub(sleep_time,
- timespec64_sub(new_system, old_system));
+ timespec64_sub(new_system, old_system));
if (sleep_time.tv_sec >= 0)
timekeeping_inject_sleeptime64(&sleep_time);
@@ -178,9 +226,9 @@
timerqueue_init_head(&rtc->timerqueue);
INIT_WORK(&rtc->irqwork, rtc_timer_do_work);
/* Init aie timer */
- rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc);
+ rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, rtc);
/* Init uie timer */
- rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc);
+ rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, rtc);
/* Init pie timer */
hrtimer_init(&rtc->pie_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
rtc->pie_timer.function = rtc_pie_update_irq;
@@ -278,93 +326,11 @@
}
/**
- * rtc_device_register - register w/ RTC class
- * @dev: the device to register
- *
- * rtc_device_unregister() must be called when the class device is no
- * longer needed.
- *
- * Returns the pointer to the new struct class device.
- */
-struct rtc_device *rtc_device_register(const char *name, struct device *dev,
- const struct rtc_class_ops *ops,
- struct module *owner)
-{
- struct rtc_device *rtc;
- struct rtc_wkalrm alrm;
- int id, err;
-
- id = rtc_device_get_id(dev);
- if (id < 0) {
- err = id;
- goto exit;
- }
-
- rtc = rtc_allocate_device();
- if (!rtc) {
- err = -ENOMEM;
- goto exit_ida;
- }
-
- rtc->id = id;
- rtc->ops = ops;
- rtc->owner = owner;
- rtc->dev.parent = dev;
-
- dev_set_name(&rtc->dev, "rtc%d", id);
-
- rtc_device_get_offset(rtc);
-
- /* Check to see if there is an ALARM already set in hw */
- err = __rtc_read_alarm(rtc, &alrm);
-
- if (!err && !rtc_valid_tm(&alrm.time))
- rtc_initialize_alarm(rtc, &alrm);
-
- rtc_dev_prepare(rtc);
-
- err = cdev_device_add(&rtc->char_dev, &rtc->dev);
- if (err) {
- dev_warn(&rtc->dev, "%s: failed to add char device %d:%d\n",
- name, MAJOR(rtc->dev.devt), rtc->id);
-
- /* This will free both memory and the ID */
- put_device(&rtc->dev);
- goto exit;
- } else {
- dev_dbg(&rtc->dev, "%s: dev (%d:%d)\n", name,
- MAJOR(rtc->dev.devt), rtc->id);
- }
-
- rtc_proc_add_device(rtc);
-
- dev_info(dev, "rtc core: registered %s as %s\n",
- name, dev_name(&rtc->dev));
-
-#ifdef CONFIG_RTC_HCTOSYS_DEVICE
- if (!strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE))
- rtc_hctosys();
-#endif
-
- return rtc;
-
-exit_ida:
- ida_simple_remove(&rtc_ida, id);
-
-exit:
- dev_err(dev, "rtc core: unable to register %s, err = %d\n",
- name, err);
- return ERR_PTR(err);
-}
-EXPORT_SYMBOL_GPL(rtc_device_register);
-
-
-/**
* rtc_device_unregister - removes the previously registered RTC class device
*
* @rtc: the RTC class device to destroy
*/
-void rtc_device_unregister(struct rtc_device *rtc)
+static void rtc_device_unregister(struct rtc_device *rtc)
{
mutex_lock(&rtc->ops_lock);
/*
@@ -377,78 +343,6 @@
mutex_unlock(&rtc->ops_lock);
put_device(&rtc->dev);
}
-EXPORT_SYMBOL_GPL(rtc_device_unregister);
-
-static void devm_rtc_device_release(struct device *dev, void *res)
-{
- struct rtc_device *rtc = *(struct rtc_device **)res;
-
- rtc_nvmem_unregister(rtc);
- rtc_device_unregister(rtc);
-}
-
-static int devm_rtc_device_match(struct device *dev, void *res, void *data)
-{
- struct rtc **r = res;
-
- return *r == data;
-}
-
-/**
- * devm_rtc_device_register - resource managed rtc_device_register()
- * @dev: the device to register
- * @name: the name of the device
- * @ops: the rtc operations structure
- * @owner: the module owner
- *
- * @return a struct rtc on success, or an ERR_PTR on error
- *
- * Managed rtc_device_register(). The rtc_device returned from this function
- * are automatically freed on driver detach. See rtc_device_register()
- * for more information.
- */
-
-struct rtc_device *devm_rtc_device_register(struct device *dev,
- const char *name,
- const struct rtc_class_ops *ops,
- struct module *owner)
-{
- struct rtc_device **ptr, *rtc;
-
- ptr = devres_alloc(devm_rtc_device_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return ERR_PTR(-ENOMEM);
-
- rtc = rtc_device_register(name, dev, ops, owner);
- if (!IS_ERR(rtc)) {
- *ptr = rtc;
- devres_add(dev, ptr);
- } else {
- devres_free(ptr);
- }
-
- return rtc;
-}
-EXPORT_SYMBOL_GPL(devm_rtc_device_register);
-
-/**
- * devm_rtc_device_unregister - resource managed devm_rtc_device_unregister()
- * @dev: the device to unregister
- * @rtc: the RTC class device to unregister
- *
- * Deallocated a rtc allocated with devm_rtc_device_register(). Normally this
- * function will not need to be called and the resource management code will
- * ensure that the resource is freed.
- */
-void devm_rtc_device_unregister(struct device *dev, struct rtc_device *rtc)
-{
- int rc;
-
- rc = devres_release(dev, devm_rtc_device_release,
- devm_rtc_device_match, rtc);
- WARN_ON(rc);
-}
-EXPORT_SYMBOL_GPL(devm_rtc_device_unregister);
static void devm_rtc_release_device(struct device *dev, void *res)
{
@@ -505,8 +399,10 @@
struct rtc_wkalrm alrm;
int err;
- if (!rtc->ops)
+ if (!rtc->ops) {
+ dev_dbg(&rtc->dev, "no ops set\n");
return -EINVAL;
+ }
rtc->owner = owner;
rtc_device_get_offset(rtc);
@@ -534,13 +430,49 @@
#ifdef CONFIG_RTC_HCTOSYS_DEVICE
if (!strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE))
- rtc_hctosys();
+ rtc_hctosys(rtc);
#endif
return 0;
}
EXPORT_SYMBOL_GPL(__rtc_register_device);
+/**
+ * devm_rtc_device_register - resource managed rtc_device_register()
+ * @dev: the device to register
+ * @name: the name of the device (unused)
+ * @ops: the rtc operations structure
+ * @owner: the module owner
+ *
+ * @return a struct rtc on success, or an ERR_PTR on error
+ *
+ * Managed rtc_device_register(). The rtc_device returned from this function
+ * are automatically freed on driver detach.
+ * This function is deprecated, use devm_rtc_allocate_device and
+ * rtc_register_device instead
+ */
+struct rtc_device *devm_rtc_device_register(struct device *dev,
+ const char *name,
+ const struct rtc_class_ops *ops,
+ struct module *owner)
+{
+ struct rtc_device *rtc;
+ int err;
+
+ rtc = devm_rtc_allocate_device(dev);
+ if (IS_ERR(rtc))
+ return rtc;
+
+ rtc->ops = ops;
+
+ err = __rtc_register_device(owner, rtc);
+ if (err)
+ return ERR_PTR(err);
+
+ return rtc;
+}
+EXPORT_SYMBOL_GPL(devm_rtc_device_register);
+
static int __init rtc_init(void)
{
rtc_class = class_create(THIS_MODULE, "rtc");
--
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