Input: add CMA3000 accelerometer driver

Add support for CMA3000 Tri-axis accelerometer, which supports Motion
detect, Measurement and Free fall modes. CMA3000 supports both I2C/SPI
bus for communication, currently the driver supports I2C based
communication.

Signed-off-by: Hemanth V <hemanthv@ti.com>
Reviewed-by: Jonathan Cameron <jic23@cam.ac.uk>
Reviewed-by: Sergio Aguirre <saaguirre@ti.com>
Reviewed-by: Shubhrajyoti <Shubhrajyoti@ti.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Hemanth V 2010-11-30 23:03:54 -08:00 committed by Dmitry Torokhov
parent 33e808c383
commit b029ffafe8
7 changed files with 781 additions and 0 deletions

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@ -0,0 +1,115 @@
Kernel driver for CMA3000-D0x
============================
Supported chips:
* VTI CMA3000-D0x
Datasheet:
CMA3000-D0X Product Family Specification 8281000A.02.pdf
<http://www.vti.fi/en/>
Author: Hemanth V <hemanthv@ti.com>
Description
-----------
CMA3000 Tri-axis accelerometer supports Motion detect, Measurement and
Free fall modes.
Motion Detect Mode: Its the low power mode where interrupts are generated only
when motion exceeds the defined thresholds.
Measurement Mode: This mode is used to read the acceleration data on X,Y,Z
axis and supports 400, 100, 40 Hz sample frequency.
Free fall Mode: This mode is intended to save system resources.
Threshold values: Chip supports defining threshold values for above modes
which includes time and g value. Refer product specifications for more details.
CMA3000 chip supports mutually exclusive I2C and SPI interfaces for
communication, currently the driver supports I2C based communication only.
Initial configuration for bus mode is set in non volatile memory and can later
be modified through bus interface command.
Driver reports acceleration data through input subsystem. It generates ABS_MISC
event with value 1 when free fall is detected.
Platform data need to be configured for initial default values.
Platform Data
-------------
fuzz_x: Noise on X Axis
fuzz_y: Noise on Y Axis
fuzz_z: Noise on Z Axis
g_range: G range in milli g i.e 2000 or 8000
mode: Default Operating mode
mdthr: Motion detect g range threshold value
mdfftmr: Motion detect and free fall time threshold value
ffthr: Free fall g range threshold value
Input Interface
--------------
Input driver version is 1.0.0
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "cma3000-accelerometer"
Supported events:
Event type 0 (Sync)
Event type 3 (Absolute)
Event code 0 (X)
Value 47
Min -8000
Max 8000
Fuzz 200
Event code 1 (Y)
Value -28
Min -8000
Max 8000
Fuzz 200
Event code 2 (Z)
Value 905
Min -8000
Max 8000
Fuzz 200
Event code 40 (Misc)
Value 0
Min 0
Max 1
Event type 4 (Misc)
Register/Platform parameters Description
----------------------------------------
mode:
0: power down mode
1: 100 Hz Measurement mode
2: 400 Hz Measurement mode
3: 40 Hz Measurement mode
4: Motion Detect mode (default)
5: 100 Hz Free fall mode
6: 40 Hz Free fall mode
7: Power off mode
grange:
2000: 2000 mg or 2G Range
8000: 8000 mg or 8G Range
mdthr:
X: X * 71mg (8G Range)
X: X * 18mg (2G Range)
mdfftmr:
X: (X & 0x70) * 100 ms (MDTMR)
(X & 0x0F) * 2.5 ms (FFTMR 400 Hz)
(X & 0x0F) * 10 ms (FFTMR 100 Hz)
ffthr:
X: (X >> 2) * 18mg (2G Range)
X: (X & 0x0F) * 71 mg (8G Range)

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@ -448,4 +448,28 @@ config INPUT_ADXL34X_SPI
To compile this driver as a module, choose M here: the
module will be called adxl34x-spi.
config INPUT_CMA3000
tristate "VTI CMA3000 Tri-axis accelerometer"
help
Say Y here if you want to use VTI CMA3000_D0x Accelerometer
driver
This driver currently only supports I2C interface to the
controller. Also select the I2C method.
If unsure, say N
To compile this driver as a module, choose M here: the
module will be called cma3000_d0x.
config INPUT_CMA3000_I2C
tristate "Support I2C bus connection"
depends on INPUT_CMA3000 && I2C
help
Say Y here if you want to use VTI CMA3000_D0x Accelerometer
through I2C interface.
To compile this driver as a module, choose M here: the
module will be called cma3000_d0x_i2c.
endif

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@ -18,6 +18,8 @@ obj-$(CONFIG_INPUT_ATI_REMOTE2) += ati_remote2.o
obj-$(CONFIG_INPUT_ATLAS_BTNS) += atlas_btns.o
obj-$(CONFIG_INPUT_BFIN_ROTARY) += bfin_rotary.o
obj-$(CONFIG_INPUT_CM109) += cm109.o
obj-$(CONFIG_INPUT_CMA3000) += cma3000_d0x.o
obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o
obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o

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@ -0,0 +1,398 @@
/*
* VTI CMA3000_D0x Accelerometer driver
*
* Copyright (C) 2010 Texas Instruments
* Author: Hemanth V <hemanthv@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/cma3000.h>
#include "cma3000_d0x.h"
#define CMA3000_WHOAMI 0x00
#define CMA3000_REVID 0x01
#define CMA3000_CTRL 0x02
#define CMA3000_STATUS 0x03
#define CMA3000_RSTR 0x04
#define CMA3000_INTSTATUS 0x05
#define CMA3000_DOUTX 0x06
#define CMA3000_DOUTY 0x07
#define CMA3000_DOUTZ 0x08
#define CMA3000_MDTHR 0x09
#define CMA3000_MDFFTMR 0x0A
#define CMA3000_FFTHR 0x0B
#define CMA3000_RANGE2G (1 << 7)
#define CMA3000_RANGE8G (0 << 7)
#define CMA3000_BUSI2C (0 << 4)
#define CMA3000_MODEMASK (7 << 1)
#define CMA3000_GRANGEMASK (1 << 7)
#define CMA3000_STATUS_PERR 1
#define CMA3000_INTSTATUS_FFDET (1 << 2)
/* Settling time delay in ms */
#define CMA3000_SETDELAY 30
/* Delay for clearing interrupt in us */
#define CMA3000_INTDELAY 44
/*
* Bit weights in mg for bit 0, other bits need
* multipy factor 2^n. Eight bit is the sign bit.
*/
#define BIT_TO_2G 18
#define BIT_TO_8G 71
struct cma3000_accl_data {
const struct cma3000_bus_ops *bus_ops;
const struct cma3000_platform_data *pdata;
struct device *dev;
struct input_dev *input_dev;
int bit_to_mg;
int irq;
int g_range;
u8 mode;
struct mutex mutex;
bool opened;
bool suspended;
};
#define CMA3000_READ(data, reg, msg) \
(data->bus_ops->read(data->dev, reg, msg))
#define CMA3000_SET(data, reg, val, msg) \
((data)->bus_ops->write(data->dev, reg, val, msg))
/*
* Conversion for each of the eight modes to g, depending
* on G range i.e 2G or 8G. Some modes always operate in
* 8G.
*/
static int mode_to_mg[8][2] = {
{ 0, 0 },
{ BIT_TO_8G, BIT_TO_2G },
{ BIT_TO_8G, BIT_TO_2G },
{ BIT_TO_8G, BIT_TO_8G },
{ BIT_TO_8G, BIT_TO_8G },
{ BIT_TO_8G, BIT_TO_2G },
{ BIT_TO_8G, BIT_TO_2G },
{ 0, 0},
};
static void decode_mg(struct cma3000_accl_data *data, int *datax,
int *datay, int *dataz)
{
/* Data in 2's complement, convert to mg */
*datax = ((s8)*datax) * data->bit_to_mg;
*datay = ((s8)*datay) * data->bit_to_mg;
*dataz = ((s8)*dataz) * data->bit_to_mg;
}
static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
{
struct cma3000_accl_data *data = dev_id;
int datax, datay, dataz;
u8 ctrl, mode, range, intr_status;
intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status");
if (intr_status < 0)
return IRQ_NONE;
/* Check if free fall is detected, report immediately */
if (intr_status & CMA3000_INTSTATUS_FFDET) {
input_report_abs(data->input_dev, ABS_MISC, 1);
input_sync(data->input_dev);
} else {
input_report_abs(data->input_dev, ABS_MISC, 0);
}
datax = CMA3000_READ(data, CMA3000_DOUTX, "X");
datay = CMA3000_READ(data, CMA3000_DOUTY, "Y");
dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z");
ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl");
mode = (ctrl & CMA3000_MODEMASK) >> 1;
range = (ctrl & CMA3000_GRANGEMASK) >> 7;
data->bit_to_mg = mode_to_mg[mode][range];
/* Interrupt not for this device */
if (data->bit_to_mg == 0)
return IRQ_NONE;
/* Decode register values to milli g */
decode_mg(data, &datax, &datay, &dataz);
input_report_abs(data->input_dev, ABS_X, datax);
input_report_abs(data->input_dev, ABS_Y, datay);
input_report_abs(data->input_dev, ABS_Z, dataz);
input_sync(data->input_dev);
return IRQ_HANDLED;
}
static int cma3000_reset(struct cma3000_accl_data *data)
{
int val;
/* Reset sequence */
CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset");
CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset");
CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset");
/* Settling time delay */
mdelay(10);
val = CMA3000_READ(data, CMA3000_STATUS, "Status");
if (val < 0) {
dev_err(data->dev, "Reset failed\n");
return val;
}
if (val & CMA3000_STATUS_PERR) {
dev_err(data->dev, "Parity Error\n");
return -EIO;
}
return 0;
}
static int cma3000_poweron(struct cma3000_accl_data *data)
{
const struct cma3000_platform_data *pdata = data->pdata;
u8 ctrl = 0;
int ret;
if (data->g_range == CMARANGE_2G) {
ctrl = (data->mode << 1) | CMA3000_RANGE2G;
} else if (data->g_range == CMARANGE_8G) {
ctrl = (data->mode << 1) | CMA3000_RANGE8G;
} else {
dev_info(data->dev,
"Invalid G range specified, assuming 8G\n");
ctrl = (data->mode << 1) | CMA3000_RANGE8G;
}
ctrl |= data->bus_ops->ctrl_mod;
CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr,
"Motion Detect Threshold");
CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr,
"Time register");
CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr,
"Free fall threshold");
ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
if (ret < 0)
return -EIO;
msleep(CMA3000_SETDELAY);
return 0;
}
static int cma3000_poweroff(struct cma3000_accl_data *data)
{
int ret;
ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
msleep(CMA3000_SETDELAY);
return ret;
}
static int cma3000_open(struct input_dev *input_dev)
{
struct cma3000_accl_data *data = input_get_drvdata(input_dev);
mutex_lock(&data->mutex);
if (!data->suspended)
cma3000_poweron(data);
data->opened = true;
mutex_unlock(&data->mutex);
return 0;
}
static void cma3000_close(struct input_dev *input_dev)
{
struct cma3000_accl_data *data = input_get_drvdata(input_dev);
mutex_lock(&data->mutex);
if (!data->suspended)
cma3000_poweroff(data);
data->opened = false;
mutex_unlock(&data->mutex);
}
void cma3000_suspend(struct cma3000_accl_data *data)
{
mutex_lock(&data->mutex);
if (!data->suspended && data->opened)
cma3000_poweroff(data);
data->suspended = true;
mutex_unlock(&data->mutex);
}
EXPORT_SYMBOL(cma3000_suspend);
void cma3000_resume(struct cma3000_accl_data *data)
{
mutex_lock(&data->mutex);
if (data->suspended && data->opened)
cma3000_poweron(data);
data->suspended = false;
mutex_unlock(&data->mutex);
}
EXPORT_SYMBOL(cma3000_resume);
struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
const struct cma3000_bus_ops *bops)
{
const struct cma3000_platform_data *pdata = dev->platform_data;
struct cma3000_accl_data *data;
struct input_dev *input_dev;
int rev;
int error;
if (!pdata) {
dev_err(dev, "platform data not found\n");
error = -EINVAL;
goto err_out;
}
/* if no IRQ return error */
if (irq == 0) {
error = -EINVAL;
goto err_out;
}
data = kzalloc(sizeof(struct cma3000_accl_data), GFP_KERNEL);
input_dev = input_allocate_device();
if (!data || !input_dev) {
error = -ENOMEM;
goto err_free_mem;
}
data->dev = dev;
data->input_dev = input_dev;
data->bus_ops = bops;
data->pdata = pdata;
data->irq = irq;
mutex_init(&data->mutex);
data->mode = pdata->mode;
if (data->mode < CMAMODE_DEFAULT || data->mode > CMAMODE_POFF) {
data->mode = CMAMODE_MOTDET;
dev_warn(dev,
"Invalid mode specified, assuming Motion Detect\n");
}
data->g_range = pdata->g_range;
if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) {
dev_info(dev,
"Invalid G range specified, assuming 8G\n");
data->g_range = CMARANGE_8G;
}
input_dev->name = "cma3000-accelerometer";
input_dev->id.bustype = bops->bustype;
input_dev->open = cma3000_open;
input_dev->close = cma3000_close;
__set_bit(EV_ABS, input_dev->evbit);
input_set_abs_params(input_dev, ABS_X,
-data->g_range, data->g_range, pdata->fuzz_x, 0);
input_set_abs_params(input_dev, ABS_Y,
-data->g_range, data->g_range, pdata->fuzz_y, 0);
input_set_abs_params(input_dev, ABS_Z,
-data->g_range, data->g_range, pdata->fuzz_z, 0);
input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0);
input_set_drvdata(input_dev, data);
error = cma3000_reset(data);
if (error)
goto err_free_mem;
rev = CMA3000_READ(data, CMA3000_REVID, "Revid");
if (rev < 0) {
error = rev;
goto err_free_mem;
}
pr_info("CMA3000 Accelerometer: Revision %x\n", rev);
error = request_threaded_irq(irq, NULL, cma3000_thread_irq,
pdata->irqflags | IRQF_ONESHOT,
"cma3000_d0x", data);
if (error) {
dev_err(dev, "request_threaded_irq failed\n");
goto err_free_mem;
}
error = input_register_device(data->input_dev);
if (error) {
dev_err(dev, "Unable to register input device\n");
goto err_free_irq;
}
return data;
err_free_irq:
free_irq(irq, data);
err_free_mem:
input_free_device(input_dev);
kfree(data);
err_out:
return ERR_PTR(error);
}
EXPORT_SYMBOL(cma3000_init);
void cma3000_exit(struct cma3000_accl_data *data)
{
free_irq(data->irq, data);
input_unregister_device(data->input_dev);
kfree(data);
}
EXPORT_SYMBOL(cma3000_exit);
MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");

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@ -0,0 +1,42 @@
/*
* VTI CMA3000_D0x Accelerometer driver
*
* Copyright (C) 2010 Texas Instruments
* Author: Hemanth V <hemanthv@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _INPUT_CMA3000_H
#define _INPUT_CMA3000_H
#include <linux/types.h>
#include <linux/input.h>
struct device;
struct cma3000_accl_data;
struct cma3000_bus_ops {
u16 bustype;
u8 ctrl_mod;
int (*read)(struct device *, u8, char *);
int (*write)(struct device *, u8, u8, char *);
};
struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
const struct cma3000_bus_ops *bops);
void cma3000_exit(struct cma3000_accl_data *);
void cma3000_suspend(struct cma3000_accl_data *);
void cma3000_resume(struct cma3000_accl_data *);
#endif

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@ -0,0 +1,141 @@
/*
* Implements I2C interface for VTI CMA300_D0x Accelerometer driver
*
* Copyright (C) 2010 Texas Instruments
* Author: Hemanth V <hemanthv@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/input/cma3000.h>
#include "cma3000_d0x.h"
static int cma3000_i2c_set(struct device *dev,
u8 reg, u8 val, char *msg)
{
struct i2c_client *client = to_i2c_client(dev);
int ret;
ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0)
dev_err(&client->dev,
"%s failed (%s, %d)\n", __func__, msg, ret);
return ret;
}
static int cma3000_i2c_read(struct device *dev, u8 reg, char *msg)
{
struct i2c_client *client = to_i2c_client(dev);
int ret;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev,
"%s failed (%s, %d)\n", __func__, msg, ret);
return ret;
}
static const struct cma3000_bus_ops cma3000_i2c_bops = {
.bustype = BUS_I2C,
#define CMA3000_BUSI2C (0 << 4)
.ctrl_mod = CMA3000_BUSI2C,
.read = cma3000_i2c_read,
.write = cma3000_i2c_set,
};
static int __devinit cma3000_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct cma3000_accl_data *data;
data = cma3000_init(&client->dev, client->irq, &cma3000_i2c_bops);
if (IS_ERR(data))
return PTR_ERR(data);
i2c_set_clientdata(client, data);
return 0;
}
static int __devexit cma3000_i2c_remove(struct i2c_client *client)
{
struct cma3000_accl_data *data = i2c_get_clientdata(client);
cma3000_exit(data);
return 0;
}
#ifdef CONFIG_PM
static int cma3000_i2c_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cma3000_accl_data *data = i2c_get_clientdata(client);
cma3000_suspend(data);
return 0;
}
static int cma3000_i2c_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cma3000_accl_data *data = i2c_get_clientdata(client);
cma3000_resume(data);
return 0;
}
static const struct dev_pm_ops cma3000_i2c_pm_ops = {
.suspend = cma3000_i2c_suspend,
.resume = cma3000_i2c_resume,
};
#endif
static const struct i2c_device_id cma3000_i2c_id[] = {
{ "cma3000_d01", 0 },
{ },
};
static struct i2c_driver cma3000_i2c_driver = {
.probe = cma3000_i2c_probe,
.remove = __devexit_p(cma3000_i2c_remove),
.id_table = cma3000_i2c_id,
.driver = {
.name = "cma3000_i2c_accl",
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &cma3000_i2c_pm_ops,
#endif
},
};
static int __init cma3000_i2c_init(void)
{
return i2c_add_driver(&cma3000_i2c_driver);
}
static void __exit cma3000_i2c_exit(void)
{
i2c_del_driver(&cma3000_i2c_driver);
}
module_init(cma3000_i2c_init);
module_exit(cma3000_i2c_exit);
MODULE_DESCRIPTION("CMA3000-D0x Accelerometer I2C Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");

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@ -0,0 +1,59 @@
/*
* VTI CMA3000_Dxx Accelerometer driver
*
* Copyright (C) 2010 Texas Instruments
* Author: Hemanth V <hemanthv@ti.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _LINUX_CMA3000_H
#define _LINUX_CMA3000_H
#define CMAMODE_DEFAULT 0
#define CMAMODE_MEAS100 1
#define CMAMODE_MEAS400 2
#define CMAMODE_MEAS40 3
#define CMAMODE_MOTDET 4
#define CMAMODE_FF100 5
#define CMAMODE_FF400 6
#define CMAMODE_POFF 7
#define CMARANGE_2G 2000
#define CMARANGE_8G 8000
/**
* struct cma3000_i2c_platform_data - CMA3000 Platform data
* @fuzz_x: Noise on X Axis
* @fuzz_y: Noise on Y Axis
* @fuzz_z: Noise on Z Axis
* @g_range: G range in milli g i.e 2000 or 8000
* @mode: Operating mode
* @mdthr: Motion detect threshold value
* @mdfftmr: Motion detect and free fall time value
* @ffthr: Free fall threshold value
*/
struct cma3000_platform_data {
int fuzz_x;
int fuzz_y;
int fuzz_z;
int g_range;
uint8_t mode;
uint8_t mdthr;
uint8_t mdfftmr;
uint8_t ffthr;
unsigned long irqflags;
};
#endif