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alistair23-linux/drivers/hwmon/lis3lv02d.h
Samu Onkalo 32496c76b7 lis3: scale output values to mg 
Report output values as 1/1000 of earth gravity.

Output values from lis3 can be read from sysfs position entry and from
input device.  Input device can be accessed as event device and as
joystick device.  Joystick device can be in two modes.  Meaning of the
output values varies from case to case depending on the chip type and
configuration (scale).  Only joystick interface in JS_CORR_BROKEN mode
returned somehow similar output values in different configurations.
Joystick device is in that state by default in case of lis3.

Position sysfs entry, input event device and raw joystick device have been
little bit broken since meaning of the output values has been varied
between 12 and 8 bit devices.  Applications which relayed on those methods
failed if the chip is different than the expected one.

This patch converts output values to mean similar thing in different
configurations.  Both 8 and 12 bit devices reports now same acceleration
values.  If somebody implements full scale support to the driver, output
values will still mean the same.  Scaling factor and input device range
must be updated in that case.

Joystick interface in JS_CORR_BROKEN mode is not touched by this patch.
All other interfaces have different scale after this change.  For 12 bit
device scaling factor is 0.977 which keeps scaled and unscaled values are
quite close to each others.  For 8 bit device, scaled values are 18 times
bigger than unscaled values.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Acked-by: Éric Piel <Eric.Piel@tremplin-utc.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-12-15 08:53:36 -08:00

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/*
* lis3lv02d.h - ST LIS3LV02DL accelerometer driver
*
* Copyright (C) 2007-2008 Yan Burman
* 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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
/*
* 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>
enum lis3_reg {
WHO_AM_I = 0x0F,
OFFSET_X = 0x16,
OFFSET_Y = 0x17,
OFFSET_Z = 0x18,
GAIN_X = 0x19,
GAIN_Y = 0x1A,
GAIN_Z = 0x1B,
CTRL_REG1 = 0x20,
CTRL_REG2 = 0x21,
CTRL_REG3 = 0x22,
HP_FILTER_RESET = 0x23,
STATUS_REG = 0x27,
OUTX_L = 0x28,
OUTX_H = 0x29,
OUTX = 0x29,
OUTY_L = 0x2A,
OUTY_H = 0x2B,
OUTY = 0x2B,
OUTZ_L = 0x2C,
OUTZ_H = 0x2D,
OUTZ = 0x2D,
};
enum lis302d_reg {
FF_WU_CFG_1 = 0x30,
FF_WU_SRC_1 = 0x31,
FF_WU_THS_1 = 0x32,
FF_WU_DURATION_1 = 0x33,
FF_WU_CFG_2 = 0x34,
FF_WU_SRC_2 = 0x35,
FF_WU_THS_2 = 0x36,
FF_WU_DURATION_2 = 0x37,
CLICK_CFG = 0x38,
CLICK_SRC = 0x39,
CLICK_THSY_X = 0x3B,
CLICK_THSZ = 0x3C,
CLICK_TIMELIMIT = 0x3D,
CLICK_LATENCY = 0x3E,
CLICK_WINDOW = 0x3F,
};
enum lis3lv02d_reg {
FF_WU_CFG = 0x30,
FF_WU_SRC = 0x31,
FF_WU_ACK = 0x32,
FF_WU_THS_L = 0x34,
FF_WU_THS_H = 0x35,
FF_WU_DURATION = 0x36,
DD_CFG = 0x38,
DD_SRC = 0x39,
DD_ACK = 0x3A,
DD_THSI_L = 0x3C,
DD_THSI_H = 0x3D,
DD_THSE_L = 0x3E,
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_12b {
CTRL1_Xen = 0x01,
CTRL1_Yen = 0x02,
CTRL1_Zen = 0x04,
CTRL1_ST = 0x08,
CTRL1_DF0 = 0x10,
CTRL1_DF1 = 0x20,
CTRL1_PD0 = 0x40,
CTRL1_PD1 = 0x80,
};
/* Delta to ctrl1_12b version */
enum lis3lv02d_ctrl1_8b {
CTRL1_STM = 0x08,
CTRL1_STP = 0x10,
CTRL1_FS = 0x20,
CTRL1_PD = 0x40,
CTRL1_DR = 0x80,
};
enum lis3lv02d_ctrl2 {
CTRL2_DAS = 0x01,
CTRL2_SIM = 0x02,
CTRL2_DRDY = 0x04,
CTRL2_IEN = 0x08,
CTRL2_BOOT = 0x10,
CTRL2_BLE = 0x20,
CTRL2_BDU = 0x40, /* Block Data Update */
CTRL2_FS = 0x80, /* Full Scale selection */
};
enum lis302d_ctrl2 {
HP_FF_WU2 = 0x08,
HP_FF_WU1 = 0x04,
};
enum lis3lv02d_ctrl3 {
CTRL3_CFS0 = 0x01,
CTRL3_CFS1 = 0x02,
CTRL3_FDS = 0x10,
CTRL3_HPFF = 0x20,
CTRL3_HPDD = 0x40,
CTRL3_ECK = 0x80,
};
enum lis3lv02d_status_reg {
STATUS_XDA = 0x01,
STATUS_YDA = 0x02,
STATUS_ZDA = 0x04,
STATUS_XYZDA = 0x08,
STATUS_XOR = 0x10,
STATUS_YOR = 0x20,
STATUS_ZOR = 0x40,
STATUS_XYZOR = 0x80,
};
enum lis3lv02d_ff_wu_cfg {
FF_WU_CFG_XLIE = 0x01,
FF_WU_CFG_XHIE = 0x02,
FF_WU_CFG_YLIE = 0x04,
FF_WU_CFG_YHIE = 0x08,
FF_WU_CFG_ZLIE = 0x10,
FF_WU_CFG_ZHIE = 0x20,
FF_WU_CFG_LIR = 0x40,
FF_WU_CFG_AOI = 0x80,
};
enum lis3lv02d_ff_wu_src {
FF_WU_SRC_XL = 0x01,
FF_WU_SRC_XH = 0x02,
FF_WU_SRC_YL = 0x04,
FF_WU_SRC_YH = 0x08,
FF_WU_SRC_ZL = 0x10,
FF_WU_SRC_ZH = 0x20,
FF_WU_SRC_IA = 0x40,
};
enum lis3lv02d_dd_cfg {
DD_CFG_XLIE = 0x01,
DD_CFG_XHIE = 0x02,
DD_CFG_YLIE = 0x04,
DD_CFG_YHIE = 0x08,
DD_CFG_ZLIE = 0x10,
DD_CFG_ZHIE = 0x20,
DD_CFG_LIR = 0x40,
DD_CFG_IEND = 0x80,
};
enum lis3lv02d_dd_src {
DD_SRC_XL = 0x01,
DD_SRC_XH = 0x02,
DD_SRC_YL = 0x04,
DD_SRC_YH = 0x08,
DD_SRC_ZL = 0x10,
DD_SRC_ZH = 0x20,
DD_SRC_IA = 0x40,
};
struct axis_conversion {
s8 x;
s8 y;
s8 z;
};
struct lis3lv02d {
void *bus_priv; /* used by the bus layer only */
int (*init) (struct lis3lv02d *lis3);
int (*write) (struct lis3lv02d *lis3, int reg, u8 val);
int (*read) (struct lis3lv02d *lis3, int reg, u8 *ret);
int *odrs; /* Supported output data rates */
u8 odr_mask; /* ODR bit mask */
u8 whoami; /* indicates measurement precision */
s16 (*read_data) (struct lis3lv02d *lis3, int reg);
int mdps_max_val;
int pwron_delay;
int scale; /*
* relationship between 1 LBS and mG
* (1/1000th of earth gravity)
*/
struct input_polled_dev *idev; /* input device */
struct platform_device *pdev; /* platform device */
atomic_t count; /* interrupt count after last read */
struct axis_conversion ac; /* hw -> logical axis */
u32 irq; /* IRQ number */
struct fasync_struct *async_queue; /* queue for the misc device */
wait_queue_head_t misc_wait; /* Wait queue for the misc device */
unsigned long misc_opened; /* bit0: whether the device is open */
struct lis3lv02d_platform_data *pdata; /* for passing board config */
struct mutex mutex; /* Serialize poll and selftest */
};
int lis3lv02d_init_device(struct lis3lv02d *lis3);
int lis3lv02d_joystick_enable(void);
void lis3lv02d_joystick_disable(void);
void lis3lv02d_poweroff(struct lis3lv02d *lis3);
void lis3lv02d_poweron(struct lis3lv02d *lis3);
int lis3lv02d_remove_fs(struct lis3lv02d *lis3);
extern struct lis3lv02d lis3_dev;
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