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@xxxxxxxxx> --- 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
