From 2aeb73e19dc3d17beebc1b9a678f4c60e1072e25 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 12 Feb 2013 05:25:38 -0300 Subject: [PATCH] [media] stk-webcam: add ASUS F3JC to upside-down list And add an extensive comment relating the history of the upside-down handling in this driver. Signed-off-by: Hans Verkuil Tested-by: Arvydas Sidorenko Thanks-to: Hans de Goede Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/stkwebcam/stk-webcam.c | 40 +++++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c index 4cbab085e348..b2a5ee453a6a 100644 --- a/drivers/media/usb/stkwebcam/stk-webcam.c +++ b/drivers/media/usb/stkwebcam/stk-webcam.c @@ -63,7 +63,39 @@ static struct usb_device_id stkwebcam_table[] = { }; MODULE_DEVICE_TABLE(usb, stkwebcam_table); -/* The stk webcam laptop module is mounted upside down in some laptops :( */ +/* + * The stk webcam laptop module is mounted upside down in some laptops :( + * + * Some background information (thanks to Hans de Goede for providing this): + * + * 1) Once upon a time the stkwebcam driver was written + * + * 2) The webcam in question was used mostly in Asus laptop models, including + * the laptop of the original author of the driver, and in these models, in + * typical Asus fashion (see the long long list for uvc cams inside v4l-utils), + * they mounted the webcam-module the wrong way up. So the hflip and vflip + * module options were given a default value of 1 (the correct value for + * upside down mounted models) + * + * 3) Years later I got a bug report from a user with a laptop with stkwebcam, + * where the module was actually mounted the right way up, and thus showed + * upside down under Linux. So now I was facing the choice of 2 options: + * + * a) Add a not-upside-down list to stkwebcam, which overrules the default. + * + * b) Do it like all the other drivers do, and make the default right for + * cams mounted the proper way and add an upside-down model list, with + * models where we need to flip-by-default. + * + * Despite knowing that going b) would cause a period of pain where we were + * building the table I opted to go for option b), since a) is just too ugly, + * and worse different from how every other driver does it leading to + * confusion in the long run. This change was made in kernel 3.6. + * + * So for any user report about upside-down images since kernel 3.6 ask them + * to provide the output of 'sudo dmidecode' so the laptop can be added in + * the table below. + */ static const struct dmi_system_id stk_upside_down_dmi_table[] = { { .ident = "ASUS G1", @@ -71,6 +103,12 @@ static const struct dmi_system_id stk_upside_down_dmi_table[] = { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "G1") } + }, { + .ident = "ASUS F3JC", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "F3JC") + } }, {} }; -- 2.39.5