From 2db4a76d5f3554e9e5632c8f91828313318579c8 Mon Sep 17 00:00:00 2001 From: Samu Onkalo Date: Mon, 14 Dec 2009 18:01:43 -0800 Subject: lis3: selftest support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Implement selftest feature as specified by chip manufacturer. Control: read selftest sysfs entry Response: "OK x y z" or "FAIL x y z" where x, y, and z are difference between selftest mode and normal mode. Test is passed when values are within acceptance limit values. Acceptance limits are provided via platform data. See chip spesifications for acceptance limits. If limits are not properly set, OK / FAIL decision is meaningless. However, userspace application can still make decision based on the numeric x, y, z values. Selftest is meant for HW diagnostic purposes. It is not meant to be called during normal use of the chip. It may cause false interrupt events. Selftest mode delays polling of the normal results but it doesn't cause wrong values. Chip must be in static state during selftest. Any acceration during the test causes most probably failure. Signed-off-by: Samu Onkalo Acked-by: Éric Piel Cc: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/lis3lv02d.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux/lis3lv02d.h') diff --git a/include/linux/lis3lv02d.h b/include/linux/lis3lv02d.h index 89701355c74..f1ca0dcc162 100644 --- a/include/linux/lis3lv02d.h +++ b/include/linux/lis3lv02d.h @@ -55,6 +55,9 @@ struct lis3lv02d_platform_data { s8 axis_z; int (*setup_resources)(void); int (*release_resources)(void); + /* Limits for selftest are specified in chip data sheet */ + s16 st_min_limits[3]; /* min pass limit x, y, z */ + s16 st_max_limits[3]; /* max pass limit x, y, z */ }; #endif /* __LIS3LV02D_H_ */ -- cgit v1.2.3