linux-kernel - [PATCH v2 3/4] hwmon: (lm90) Unmask hardware interrupt

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Message-Id: <20210618211202.2938-4-digetx@gmail.com>
Date:   Sat, 19 Jun 2021 00:12:01 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH v2 3/4] hwmon: (lm90) Unmask hardware interrupt

The ALERT interrupt is enabled by default after power-on, but it could
be masked by bootloader. For example this is the case on Acer A500 tablet
device. Unmask the hardware interrupt if interrupt is provided.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/hwmon/lm90.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index e7b678a40b39..658b486d2f5e 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -1704,6 +1704,13 @@ static int lm90_init_client(struct i2c_client *client, struct lm90_data *data)
 	if (data->kind == max6696)
 		config &= ~0x08;
 
+	/*
+	 * Interrupt is enabled by default on reset, but it may be disabled
+	 * by bootloader, unmask it.
+	 */
+	if (client->irq)
+		config &= ~0x80;
+
 	config &= 0xBF;	/* run */
 	lm90_update_confreg(data, config);
 
-- 
2.30.2