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platform/chrome: wilco_ec: Fix keyboard backlight probing

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The EC on the Wilco platform responds with 0xFF to commands related to
the keyboard backlight on the absence of a keyboard backlight module.
This change allows the EC driver to continue loading even if the
backlight module is not present.

Fixes: 119a3cb6d687 ("platform/chrome: wilco_ec: Add keyboard backlight LED support")
Signed-off-by: Daniel Campello <campello@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
This commit is contained in:
Daniel Campello 2020-01-07 11:24:21 -07:00 committed by Benson Leung
parent 856a0a6e2d
commit dfb9a8857f
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GPG Key ID: 736DAA268733B0C2
1 changed files with 20 additions and 8 deletions
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28
drivers/platform/chrome/wilco_ec/keyboard_leds.c
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@ -73,13 +73,6 @@ static int send_kbbl_msg(struct wilco_ec_device *ec,
return ret;
}
if (response->status) {
dev_err(ec->dev,
"EC reported failure sending keyboard LEDs command: %d",
response->status);
return -EIO;
}
return 0;
}
@ -87,6 +80,7 @@ static int set_kbbl(struct wilco_ec_device *ec, enum led_brightness brightness)
{
struct wilco_keyboard_leds_msg request;
struct wilco_keyboard_leds_msg response;
int ret;
memset(&request, 0, sizeof(request));
request.command = WILCO_EC_COMMAND_KBBL;
@ -94,7 +88,18 @@ static int set_kbbl(struct wilco_ec_device *ec, enum led_brightness brightness)
request.mode = WILCO_KBBL_MODE_FLAG_PWM;
request.percent = brightness;
return send_kbbl_msg(ec, &request, &response);
ret = send_kbbl_msg(ec, &request, &response);
if (ret < 0)
return ret;
if (response.status) {
dev_err(ec->dev,
"EC reported failure sending keyboard LEDs command: %d",
response.status);
return -EIO;
}
return 0;
}
static int kbbl_exist(struct wilco_ec_device *ec, bool *exists)
@ -140,6 +145,13 @@ static int kbbl_init(struct wilco_ec_device *ec)
if (ret < 0)
return ret;
if (response.status) {
dev_err(ec->dev,
"EC reported failure sending keyboard LEDs command: %d",
response.status);
return -EIO;
}
if (response.mode & WILCO_KBBL_MODE_FLAG_PWM)
return response.percent;