From patchwork Wed May 25 13:56:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 12861260 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8DCE6C433F5 for ; Wed, 25 May 2022 14:22:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234822AbiEYOWA (ORCPT ); Wed, 25 May 2022 10:22:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45912 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244436AbiEYOV5 (ORCPT ); Wed, 25 May 2022 10:21:57 -0400 Received: from gateway34.websitewelcome.com (gateway34.websitewelcome.com [192.185.149.105]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F2C02617 for ; Wed, 25 May 2022 07:21:53 -0700 (PDT) Received: from cm11.websitewelcome.com (cm11.websitewelcome.com [100.42.49.5]) by gateway34.websitewelcome.com (Postfix) with ESMTP id 98240C31A2 for ; Wed, 25 May 2022 08:57:19 -0500 (CDT) Received: from 162-215-252-169.unifiedlayer.com ([208.91.199.152]) by cmsmtp with SMTP id trVnnBNQC0EfytrVnn57yJ; Wed, 25 May 2022 08:57:19 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=roeck-us.net; s=default; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=xLlFec5N8qrCBt/iBc/xnPVxAShfXkm+TdYxUalLIOY=; b=H/vojN0V8bjmyLL7qjsodHrbrj WS3XROwNYcUry/JXte+pYzNEJnVjs0Tu8vk+eYkYxc/TRE6KXieohI/qybI+62gIZ91wQbS2eLs84 1p9lNnYvIHkbmyLu2215BL9pocO4pWIfrvpYPi8x/NDMloHvlsIglYN2PKgYmE1vRzSYAbl9fgyam LSUBGDp5wM3wuDVhJmlIrggKj6BIboDjPeTxkJGBkwJNl33RGxRu3yHwL1AW5aVyA9UUgNUXIJU6l 3ZTvaU9mf1OTwLC2Q6bvn8EzGmNCnEgGkroI8NpkhoneHF+3r4zTbwIjAlCSHNB41824PoUygqG9e UG5zosZQ==; Received: from 108-223-40-66.lightspeed.sntcca.sbcglobal.net ([108.223.40.66]:58268 helo=localhost) by bh-25.webhostbox.net with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ntrVm-000P5y-RZ; Wed, 25 May 2022 13:57:18 +0000 From: Guenter Roeck To: linux-hwmon@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jean Delvare , Slawomir Stepien , Guenter Roeck Subject: [PATCH 02/40] hwmon: (lm90) Rework alarm/status handling Date: Wed, 25 May 2022 06:56:31 -0700 Message-Id: <20220525135709.2899592-3-linux@roeck-us.net> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220525135709.2899592-1-linux@roeck-us.net> References: <20220525135709.2899592-1-linux@roeck-us.net> MIME-Version: 1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-BWhitelist: no X-Source-IP: 108.223.40.66 X-Source-L: No X-Exim-ID: 1ntrVm-000P5y-RZ X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 108-223-40-66.lightspeed.sntcca.sbcglobal.net (localhost) [108.223.40.66]:58268 X-Source-Auth: guenter@roeck-us.net X-Email-Count: 12 X-Source-Cap: cm9lY2s7YWN0aXZzdG07YmgtMjUud2ViaG9zdGJveC5uZXQ= X-Local-Domain: yes Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Many chips supported by this driver clear status registers after it is read and update it in the next measurement cycle. Normally this falls under the radar because all registers are only read once per measurement cycle. However, there is an exception: Status registers are always read during interrupt and laert handling. This can result in invalid status reports if userspace reads an alarm attribute immediately afterwards. Rework alarm/status handling by keeping a shadow register with 'current' alarms, and by ensuring that the register is either only updated once per measurement cycle or not cleared. A second problem is related to alert handling: Alert handling is disabled for chips with broken alert after an alert was reported, but only re-enabled if attributes are read by the user. This means that alert conditions may appear and disappear unnoticed. Remedy the situation by introducing a worker to periodically read the status register(s) while alert handling is disabled, and re-enable alerts after the alert condition clears. Yet another problem is that sysfs and udev events are currently only reported to userspace if an alarm is raised, but not if an alarm condition clears. Use the new worker to detect that situation and also generate sysfs and udev events in that case. Signed-off-by: Guenter Roeck --- drivers/hwmon/lm90.c | 314 +++++++++++++++++++++++++++---------------- 1 file changed, 199 insertions(+), 115 deletions(-) diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c index 83d027c134be..63ada2d0d839 100644 --- a/drivers/hwmon/lm90.c +++ b/drivers/hwmon/lm90.c @@ -92,6 +92,7 @@ #include #include #include +#include /* * Addresses to scan @@ -499,8 +500,11 @@ struct lm90_data { const struct hwmon_channel_info *info[3]; struct hwmon_chip_info chip; struct mutex update_lock; + struct delayed_work alert_work; bool valid; /* true if register values are valid */ + bool alarms_valid; /* true if status register values are valid */ unsigned long last_updated; /* in jiffies */ + unsigned long alarms_updated; /* in jiffies */ int kind; u32 flags; @@ -518,7 +522,9 @@ struct lm90_data { s8 temp8[TEMP8_REG_NUM]; s16 temp11[TEMP11_REG_NUM]; u8 temp_hyst; - u16 alarms; /* bitvector (upper 8 bits for max6695/96) */ + u16 reported_alarms; /* alarms reported as sysfs/udev events */ + u16 current_alarms; /* current alarms, reported by chip */ + u16 alarms; /* alarms not yet reported to user */ }; /* @@ -771,6 +777,158 @@ static int lm90_update_limits(struct device *dev) return 0; } +static void lm90_report_alarms(struct device *dev, struct lm90_data *data) +{ + u16 cleared_alarms = data->reported_alarms & ~data->current_alarms; + u16 new_alarms = data->current_alarms & ~data->reported_alarms; + struct device *hwmon_dev = data->hwmon_dev; + int st, st2; + + if (!cleared_alarms && !new_alarms) + return; + + st = new_alarms & 0xff; + st2 = new_alarms >> 8; + + if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) || + (st2 & MAX6696_STATUS2_LOT2)) + dev_dbg(dev, "temp%d out of range, please check!\n", 1); + if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) || + (st2 & MAX6696_STATUS2_ROT2)) + dev_dbg(dev, "temp%d out of range, please check!\n", 2); + if (st & LM90_STATUS_ROPEN) + dev_dbg(dev, "temp%d diode open, please check!\n", 2); + if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH | + MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2)) + dev_dbg(dev, "temp%d out of range, please check!\n", 3); + if (st2 & MAX6696_STATUS2_R2OPEN) + dev_dbg(dev, "temp%d diode open, please check!\n", 3); + + st |= cleared_alarms & 0xff; + st2 |= cleared_alarms >> 8; + + if (st & LM90_STATUS_LLOW) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_min_alarm, 0); + if (st & LM90_STATUS_RLOW) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_min_alarm, 1); + if (st2 & MAX6696_STATUS2_R2LOW) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_min_alarm, 2); + + if (st & LM90_STATUS_LHIGH) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_max_alarm, 0); + if (st & LM90_STATUS_RHIGH) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_max_alarm, 1); + if (st2 & MAX6696_STATUS2_R2HIGH) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_max_alarm, 2); + + if (st & LM90_STATUS_LTHRM) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_crit_alarm, 0); + if (st & LM90_STATUS_RTHRM) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_crit_alarm, 1); + if (st2 & MAX6696_STATUS2_R2THRM) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_crit_alarm, 2); + + if (st2 & MAX6696_STATUS2_LOT2) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 0); + if (st2 & MAX6696_STATUS2_ROT2) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 1); + if (st2 & MAX6696_STATUS2_R2OT2) + hwmon_notify_event(hwmon_dev, hwmon_temp, hwmon_temp_emergency_alarm, 2); + + data->reported_alarms = data->current_alarms; +} + +static int lm90_update_alarms_locked(struct lm90_data *data, bool force) +{ + if (force || !data->alarms_valid || + time_after(jiffies, data->alarms_updated + msecs_to_jiffies(data->update_interval))) { + struct i2c_client *client = data->client; + bool check_enable; + u16 alarms; + int val; + + data->alarms_valid = false; + + val = lm90_read_reg(client, LM90_REG_R_STATUS); + if (val < 0) + return val; + alarms = val & ~LM90_STATUS_BUSY; + + if (data->kind == max6696) { + val = lm90_read_reg(client, MAX6696_REG_R_STATUS2); + if (val < 0) + return val; + alarms |= val << 8; + } + /* + * If the update is forced (called from interrupt or alert + * handler) and alarm data is valid, the alarms may have been + * updated after the last update interval, and the status + * register may still be cleared. Only add additional alarms + * in this case. Alarms will be cleared later if appropriate. + */ + if (force && data->alarms_valid) + data->current_alarms |= alarms; + else + data->current_alarms = alarms; + data->alarms |= alarms; + + check_enable = (client->irq || !(data->config_orig & 0x80)) && + (data->config & 0x80); + + if (force || check_enable) + lm90_report_alarms(&client->dev, data); + + /* + * Re-enable ALERT# output if it was originally enabled, relevant + * alarms are all clear, and alerts are currently disabled. + * Otherwise (re)schedule worker if needed. + */ + if (check_enable) { + if (!(data->current_alarms & data->alert_alarms)) { + dev_dbg(&client->dev, "Re-enabling ALERT#\n"); + lm90_update_confreg(data, data->config & ~0x80); + /* + * We may have been called from the update handler. + * If so, the worker, if scheduled, is no longer + * needed. Cancel it. Don't synchronize because + * it may already be running. + */ + cancel_delayed_work(&data->alert_work); + } else { + schedule_delayed_work(&data->alert_work, + max_t(int, HZ, msecs_to_jiffies(data->update_interval))); + } + } + data->alarms_updated = jiffies; + data->alarms_valid = true; + } + return 0; +} + +static int lm90_update_alarms(struct lm90_data *data, bool force) +{ + int err; + + mutex_lock(&data->update_lock); + err = lm90_update_alarms_locked(data, force); + mutex_unlock(&data->update_lock); + + return err; +} + +static void lm90_alert_work(struct work_struct *__work) +{ + struct delayed_work *delayed_work = container_of(__work, struct delayed_work, work); + struct lm90_data *data = container_of(delayed_work, struct lm90_data, alert_work); + + /* Nothing to do if alerts are enabled */ + if (!(data->config & 0x80)) + return; + + lm90_update_alarms(data, true); +} + static int lm90_update_device(struct device *dev) { struct lm90_data *data = dev_get_drvdata(dev); @@ -819,11 +977,6 @@ static int lm90_update_device(struct device *dev) return val; data->temp11[REMOTE_TEMP] = val; - val = lm90_read_reg(client, LM90_REG_R_STATUS); - if (val < 0) - return val; - data->alarms = val & ~LM90_STATUS_BUSY; - if (data->kind == max6696) { val = lm90_select_remote_channel(data, 1); if (val < 0) @@ -838,24 +991,11 @@ static int lm90_update_device(struct device *dev) data->temp11[REMOTE2_TEMP] = val; lm90_select_remote_channel(data, 0); - - val = lm90_read_reg(client, MAX6696_REG_R_STATUS2); - if (val < 0) - return val; - data->alarms |= val << 8; } - /* - * Re-enable ALERT# output if it was originally enabled and - * relevant alarms are all clear - */ - if ((client->irq || !(data->config_orig & 0x80)) && - !(data->alarms & data->alert_alarms)) { - if (data->config & 0x80) { - dev_dbg(&client->dev, "Re-enabling ALERT#\n"); - lm90_update_confreg(data, data->config & ~0x80); - } - } + val = lm90_update_alarms_locked(data, false); + if (val < 0) + return val; data->last_updated = jiffies; data->valid = true; @@ -1212,7 +1352,7 @@ static const u8 lm90_fault_bits[3] = { 0, 2, 10 }; static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val) { struct lm90_data *data = dev_get_drvdata(dev); - int err; + int err, bit; mutex_lock(&data->update_lock); err = lm90_update_device(dev); @@ -1225,22 +1365,33 @@ static int lm90_temp_read(struct device *dev, u32 attr, int channel, long *val) *val = lm90_get_temp11(data, lm90_temp_index[channel]); break; case hwmon_temp_min_alarm: - *val = (data->alarms >> lm90_min_alarm_bits[channel]) & 1; - break; case hwmon_temp_max_alarm: - *val = (data->alarms >> lm90_max_alarm_bits[channel]) & 1; - break; case hwmon_temp_crit_alarm: - if (data->flags & LM90_HAVE_CRIT_ALRM_SWP) - *val = (data->alarms >> lm90_crit_alarm_bits_swapped[channel]) & 1; - else - *val = (data->alarms >> lm90_crit_alarm_bits[channel]) & 1; - break; case hwmon_temp_emergency_alarm: - *val = (data->alarms >> lm90_emergency_alarm_bits[channel]) & 1; - break; case hwmon_temp_fault: - *val = (data->alarms >> lm90_fault_bits[channel]) & 1; + switch (attr) { + case hwmon_temp_min_alarm: + bit = BIT(lm90_min_alarm_bits[channel]); + break; + case hwmon_temp_max_alarm: + bit = BIT(lm90_max_alarm_bits[channel]); + break; + case hwmon_temp_crit_alarm: + if (data->flags & LM90_HAVE_CRIT_ALRM_SWP) + bit = BIT(lm90_crit_alarm_bits_swapped[channel]); + else + bit = BIT(lm90_crit_alarm_bits[channel]); + break; + case hwmon_temp_emergency_alarm: + bit = BIT(lm90_emergency_alarm_bits[channel]); + break; + case hwmon_temp_fault: + bit = BIT(lm90_fault_bits[channel]); + break; + } + *val = !!(data->alarms & bit); + data->alarms &= ~bit; + data->alarms |= data->current_alarms; break; case hwmon_temp_min: if (channel == 0) @@ -1699,6 +1850,8 @@ static void lm90_restore_conf(void *_data) struct lm90_data *data = _data; struct i2c_client *client = data->client; + cancel_delayed_work_sync(&data->alert_work); + /* Restore initial configuration */ lm90_write_convrate(data, data->convrate_orig); i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, @@ -1771,93 +1924,23 @@ static int lm90_init_client(struct i2c_client *client, struct lm90_data *data) return devm_add_action_or_reset(&client->dev, lm90_restore_conf, data); } -static bool lm90_is_tripped(struct i2c_client *client, u16 *status) +static bool lm90_is_tripped(struct i2c_client *client) { struct lm90_data *data = i2c_get_clientdata(client); - int st, st2 = 0; - - st = lm90_read_reg(client, LM90_REG_R_STATUS); - if (st < 0) - return false; - - if (data->kind == max6696) { - st2 = lm90_read_reg(client, MAX6696_REG_R_STATUS2); - if (st2 < 0) - return false; - } - - *status = st | (st2 << 8); + int ret; - if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0) + ret = lm90_update_alarms(data, true); + if (ret < 0) return false; - if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) || - (st2 & MAX6696_STATUS2_LOT2)) - dev_dbg(&client->dev, - "temp%d out of range, please check!\n", 1); - if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) || - (st2 & MAX6696_STATUS2_ROT2)) - dev_dbg(&client->dev, - "temp%d out of range, please check!\n", 2); - if (st & LM90_STATUS_ROPEN) - dev_dbg(&client->dev, - "temp%d diode open, please check!\n", 2); - if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH | - MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2)) - dev_dbg(&client->dev, - "temp%d out of range, please check!\n", 3); - if (st2 & MAX6696_STATUS2_R2OPEN) - dev_dbg(&client->dev, - "temp%d diode open, please check!\n", 3); - - if (st & LM90_STATUS_LLOW) - hwmon_notify_event(data->hwmon_dev, hwmon_temp, - hwmon_temp_min_alarm, 0); - if (st & LM90_STATUS_RLOW) - hwmon_notify_event(data->hwmon_dev, hwmon_temp, - hwmon_temp_min_alarm, 1); - if (st2 & MAX6696_STATUS2_R2LOW) - hwmon_notify_event(data->hwmon_dev, hwmon_temp, - hwmon_temp_min_alarm, 2); - if (st & LM90_STATUS_LHIGH) - hwmon_notify_event(data->hwmon_dev, hwmon_temp, - hwmon_temp_max_alarm, 0); - if (st & LM90_STATUS_RHIGH) - hwmon_notify_event(data->hwmon_dev, hwmon_temp, - hwmon_temp_max_alarm, 1); - if (st2 & MAX6696_STATUS2_R2HIGH) - hwmon_notify_event(data->hwmon_dev, hwmon_temp, - hwmon_temp_max_alarm, 2); - - if (st & LM90_STATUS_LTHRM) - hwmon_notify_event(hwmon_dev, hwmon_temp, - hwmon_temp_crit_alarm, 0); - if (st & LM90_STATUS_RTHRM) - hwmon_notify_event(hwmon_dev, hwmon_temp, - hwmon_temp_crit_alarm, 1); - if (st2 & MAX6696_STATUS2_R2THRM) - hwmon_notify_event(hwmon_dev, hwmon_temp, - hwmon_temp_crit_alarm, 2); - - if (st2 & MAX6696_STATUS2_LOT2) - hwmon_notify_event(hwmon_dev, hwmon_temp, - hwmon_temp_emergency_alarm, 0); - if (st2 & MAX6696_STATUS2_ROT2) - hwmon_notify_event(hwmon_dev, hwmon_temp, - hwmon_temp_emergency_alarm, 1); - if (st2 & MAX6696_STATUS2_R2OT2) - hwmon_notify_event(hwmon_dev, hwmon_temp, - hwmon_temp_emergency_alarm, 2); - - return true; + return !!data->current_alarms; } static irqreturn_t lm90_irq_thread(int irq, void *dev_id) { struct i2c_client *client = dev_id; - u16 status; - if (lm90_is_tripped(client, &status)) + if (lm90_is_tripped(client)) return IRQ_HANDLED; else return IRQ_NONE; @@ -1911,6 +1994,7 @@ static int lm90_probe(struct i2c_client *client) data->client = client; i2c_set_clientdata(client, data); mutex_init(&data->update_lock); + INIT_DELAYED_WORK(&data->alert_work, lm90_alert_work); /* Set the device type */ if (client->dev.of_node) @@ -2027,12 +2111,10 @@ static int lm90_probe(struct i2c_client *client) static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type, unsigned int flag) { - u16 alarms; - if (type != I2C_PROTOCOL_SMBUS_ALERT) return; - if (lm90_is_tripped(client, &alarms)) { + if (lm90_is_tripped(client)) { /* * Disable ALERT# output, because these chips don't implement * SMBus alert correctly; they should only hold the alert line @@ -2041,9 +2123,11 @@ static void lm90_alert(struct i2c_client *client, enum i2c_alert_protocol type, struct lm90_data *data = i2c_get_clientdata(client); if ((data->flags & LM90_HAVE_BROKEN_ALERT) && - (alarms & data->alert_alarms)) { + (data->current_alarms & data->alert_alarms)) { dev_dbg(&client->dev, "Disabling ALERT#\n"); lm90_update_confreg(data, data->config | 0x80); + schedule_delayed_work(&data->alert_work, + max_t(int, HZ, msecs_to_jiffies(data->update_interval))); } } else { dev_dbg(&client->dev, "Everything OK\n");