From bc62c1471773fc32adcfc05100abd16fa2b6e126 Mon Sep 17 00:00:00 2001 From: Éric Piel Date: Mon, 14 Dec 2009 18:01:39 -0800 Subject: lis3: update documentation and comments MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Most of the documentation and comments were written when the driver was only supporting one type of chip, only via ACPI/HP. Update the info to the much clearer understanding that we have now. Signed-off-by: Éric Piel Signed-off-by: Samu Onkalo Cc: Pavel Machek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/hwmon/lis3lv02d.h | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) (limited to 'drivers/hwmon/lis3lv02d.h') diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h index 3e1ff46f72d3..2431c5199534 100644 --- a/drivers/hwmon/lis3lv02d.h +++ b/drivers/hwmon/lis3lv02d.h @@ -2,7 +2,7 @@ * lis3lv02d.h - ST LIS3LV02DL accelerometer driver * * Copyright (C) 2007-2008 Yan Burman - * Copyright (C) 2008 Eric Piel + * Copyright (C) 2008-2009 Eric Piel * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -22,20 +22,18 @@ #include /* - * The actual chip is STMicroelectronics LIS3LV02DL or LIS3LV02DQ that seems to - * be connected via SPI. There exists also several similar chips (such as LIS302DL or - * LIS3L02DQ) and they have slightly different registers, but we can provide a - * common interface for all of them. - * They can also be connected via I²C. + * This driver tries to support the "digital" accelerometer chips from + * STMicroelectronics such as LIS3LV02DL, LIS302DL, LIS3L02DQ, LIS331DL, + * LIS35DE, or LIS202DL. They are very similar in terms of programming, with + * almost the same registers. In addition to differing on physical properties, + * they differ on the number of axes (2/3), precision (8/12 bits), and special + * features (freefall detection, click...). Unfortunately, not all the + * differences can be probed via a register. + * They can be connected either via I²C or SPI. */ #include -/* 2-byte registers */ -#define LIS_DOUBLE_ID 0x3A /* LIS3LV02D[LQ] */ -/* 1-byte registers */ -#define LIS_SINGLE_ID 0x3B /* LIS[32]02DL and others */ - enum lis3_reg { WHO_AM_I = 0x0F, OFFSET_X = 0x16, @@ -94,6 +92,12 @@ enum lis3lv02d_reg { DD_THSE_H = 0x3F, }; +enum lis3_who_am_i { + WAI_12B = 0x3A, /* 12 bits: LIS3LV02D[LQ]... */ + WAI_8B = 0x3B, /* 8 bits: LIS[23]02D[LQ]... */ + WAI_6B = 0x52, /* 6 bits: LIS331DLF - not supported */ +}; + enum lis3lv02d_ctrl1 { CTRL1_Xen = 0x01, CTRL1_Yen = 0x02, @@ -194,7 +198,7 @@ struct lis3lv02d { int (*write) (struct lis3lv02d *lis3, int reg, u8 val); int (*read) (struct lis3lv02d *lis3, int reg, u8 *ret); - u8 whoami; /* 3Ah: 2-byte registries, 3Bh: 1-byte registries */ + u8 whoami; /* indicates measurement precision */ s16 (*read_data) (struct lis3lv02d *lis3, int reg); int mdps_max_val; -- cgit v1.2.3