lis3: update documentation and comments
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 <eric.piel@tremplin-utc.net>
Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index 3e1ff46..2431c51 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 <linux/input-polldev.h>
/*
- * 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 <linux/lis3lv02d.h>
-/* 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 @@
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 @@
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;