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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id n17-20020aa7c691000000b0051de018af1esm10027688edq.59.2023.08.03.04.12.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Aug 2023 04:12:34 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: Liam Girdwood , Mark Brown Cc: zev@bewilderbeest.net, Naresh Solanki , linux-kernel@vger.kernel.org Subject: [PATCH] regulator: userspace-consumer: Add regulator event support Date: Thu, 3 Aug 2023 13:12:25 +0200 Message-ID: <20230803111225.107572-1-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773212721351768801 X-GMAIL-MSGID: 1773212721351768801 Add sysfs attribute to track regulator events received from regulator notifier block handler. Signed-off-by: Naresh Solanki --- drivers/regulator/userspace-consumer.c | 52 +++++++++++++++++++++++++- 1 file changed, 51 insertions(+), 1 deletion(-) base-commit: 4fb53b2377c364e3753d6e293913b57dad68e98b diff --git a/drivers/regulator/userspace-consumer.c b/drivers/regulator/userspace-consumer.c index 97f075ed68c9..a0b980022993 100644 --- a/drivers/regulator/userspace-consumer.c +++ b/drivers/regulator/userspace-consumer.c @@ -29,6 +29,10 @@ struct userspace_consumer_data { int num_supplies; struct regulator_bulk_data *supplies; + + struct kobject *kobj; + struct notifier_block nb; + unsigned long events; }; static ssize_t name_show(struct device *dev, @@ -89,12 +93,30 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr, return count; } +static DEFINE_MUTEX(events_lock); + +static ssize_t events_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct userspace_consumer_data *data = dev_get_drvdata(dev); + unsigned long e; + + mutex_lock(&events_lock); + e = data->events; + data->events = 0; + mutex_unlock(&events_lock); + + return sprintf(buf, "0x%lx\n", e); +} + static DEVICE_ATTR_RO(name); static DEVICE_ATTR_RW(state); +static DEVICE_ATTR_RO(events); static struct attribute *attributes[] = { &dev_attr_name.attr, &dev_attr_state.attr, + &dev_attr_events.attr, NULL, }; @@ -115,12 +137,28 @@ static const struct attribute_group attr_group = { .is_visible = attr_visible, }; +static int regulator_userspace_notify(struct notifier_block *nb, + unsigned long event, + void *ignored) +{ + struct userspace_consumer_data *data = + container_of(nb, struct userspace_consumer_data, nb); + + mutex_lock(&events_lock); + data->events |= event; + mutex_unlock(&events_lock); + + sysfs_notify(data->kobj, NULL, dev_attr_events.attr.name); + + return NOTIFY_OK; +} + static int regulator_userspace_consumer_probe(struct platform_device *pdev) { struct regulator_userspace_consumer_data tmpdata; struct regulator_userspace_consumer_data *pdata; struct userspace_consumer_data *drvdata; - int ret; + int i, ret; pdata = dev_get_platdata(&pdev->dev); if (!pdata) { @@ -153,6 +191,7 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev) drvdata->num_supplies = pdata->num_supplies; drvdata->supplies = pdata->supplies; drvdata->no_autoswitch = pdata->no_autoswitch; + drvdata->kobj = &pdev->dev.kobj; mutex_init(&drvdata->lock); @@ -186,6 +225,13 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev) } drvdata->enabled = !!ret; + drvdata->nb.notifier_call = regulator_userspace_notify; + for (i = 0; i < drvdata->num_supplies; i++) { + ret = devm_regulator_register_notifier(drvdata->supplies[i].consumer, &drvdata->nb); + if (ret) + goto err_enable; + } + return 0; err_enable: @@ -197,6 +243,10 @@ static int regulator_userspace_consumer_probe(struct platform_device *pdev) static int regulator_userspace_consumer_remove(struct platform_device *pdev) { struct userspace_consumer_data *data = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < data->num_supplies; i++) + devm_regulator_unregister_notifier(data->supplies[i].consumer, &data->nb); sysfs_remove_group(&pdev->dev.kobj, &attr_group);