linux-kernel - [PATCH v4 1/7] iio: cros_ec: Accept -EOPNOTSUPP as 'not supported' error code

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Date:   Thu,  6 Aug 2020 08:33:02 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Lee Jones <lee.jones@...aro.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Brian Norris <briannorris@...omium.org>,
        Yu-Hsuan Hsu <yuhsuan@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        linux-iio@...r.kernel.org, linux-input@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v4 1/7] iio: cros_ec: Accept -EOPNOTSUPP as 'not supported' error code

A follow-up patch will extend the number of errors reported by
cros_ec_cmd_xfer_status(). Specifically, the function will return
-EOPNOTSUPP if a command is not supported by the EC. Prepare for it.

Cc: Gwendal Grignou <gwendal@...omium.org>
Cc: Yu-Hsuan Hsu <yuhsuan@...omium.org>
Cc: Prashant Malani <pmalani@...omium.org>
Cc: Brian Norris <briannorris@...omium.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Brian Norris <briannorris@...omium.org>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v4: No change
v3: No change
v2: No change

 drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
index a66941fdb385..e3aff95493dd 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
@@ -73,7 +73,7 @@ static int cros_ec_sensors_read(struct iio_dev *indio_dev,
 		st->core.param.sensor_offset.flags = 0;
 
 		ret = cros_ec_motion_send_host_cmd(&st->core, 0);
-		if (ret == -EPROTO) {
+		if (ret == -EPROTO || ret == -EOPNOTSUPP) {
 			/* Reading calibscale is not supported on older EC. */
 			*val = 1;
 			*val2 = 0;
-- 
2.17.1