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Input: add support for mma8450 accelerometer 

Signed-off-by: Sammy He <r62914@freescale.com>
Signed-off-by: Eric Miao <eric.miao@linaro.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Eric Miao 2011-06-22 01:02:50 -07:00 committed by Dmitry Torokhov
parent 1483f5513b
commit 3ead8b5ddb
3 changed files with 268 additions and 1 deletions
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11
drivers/input/misc/Kconfig
View File

@ -100,6 +100,17 @@ config INPUT_MAX8925_ONKEY
To compile this driver as a module, choose M here: the module
will be called max8925_onkey.
config INPUT_MMA8450
tristate "MMA8450 - Freescale's 3-Axis, 8/12-bit Digital Accelerometer"
depends on I2C
select INPUT_POLLDEV
help
Say Y here if you want to support Freescale's MMA8450 Accelerometer
through I2C interface.
To compile this driver as a module, choose M here: the
module will be called mma8450.
config INPUT_APANEL
tristate "Fujitsu Lifebook Application Panel buttons"
depends on X86 && I2C && LEDS_CLASS

2
drivers/input/misc/Makefile
View File

@ -27,6 +27,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o
obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o
obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o
obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o
obj-$(CONFIG_INPUT_MMA8450) += mma8450.o
obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o
obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o
@ -45,4 +46,3 @@ obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
obj-$(CONFIG_INPUT_XEN_KBDDEV_FRONTEND) += xen-kbdfront.o
obj-$(CONFIG_INPUT_YEALINK) += yealink.o

256
drivers/input/misc/mma8450.c Normal file
View File

@ -0,0 +1,256 @@
/*
* Driver for Freescale's 3-Axis Accelerometer MMA8450
*
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/input-polldev.h>
#define MMA8450_DRV_NAME "mma8450"
#define MODE_CHANGE_DELAY_MS 100
#define POLL_INTERVAL 100
#define POLL_INTERVAL_MAX 500
/* register definitions */
#define MMA8450_STATUS 0x00
#define MMA8450_STATUS_ZXYDR 0x08
#define MMA8450_OUT_X8 0x01
#define MMA8450_OUT_Y8 0x02
#define MMA8450_OUT_Z8 0x03
#define MMA8450_OUT_X_LSB 0x05
#define MMA8450_OUT_X_MSB 0x06
#define MMA8450_OUT_Y_LSB 0x07
#define MMA8450_OUT_Y_MSB 0x08
#define MMA8450_OUT_Z_LSB 0x09
#define MMA8450_OUT_Z_MSB 0x0a
#define MMA8450_XYZ_DATA_CFG 0x16
#define MMA8450_CTRL_REG1 0x38
#define MMA8450_CTRL_REG2 0x39
/* mma8450 status */
struct mma8450 {
struct i2c_client *client;
struct input_polled_dev *idev;
};
static int mma8450_read(struct mma8450 *m, unsigned off)
{
struct i2c_client *c = m->client;
int ret;
ret = i2c_smbus_read_byte_data(c, off);
if (ret < 0)
dev_err(&c->dev,
"failed to read register 0x%02x, error %d\n",
off, ret);
return ret;
}
static int mma8450_write(struct mma8450 *m, unsigned off, u8 v)
{
struct i2c_client *c = m->client;
int error;
error = i2c_smbus_write_byte_data(c, off, v);
if (error < 0) {
dev_err(&c->dev,
"failed to write to register 0x%02x, error %d\n",
off, error);
return error;
}
return 0;
}
static int mma8450_read_xyz(struct mma8450 *m, int *x, int *y, int *z)
{
struct i2c_client *c = m->client;
u8 buff[6];
int err;
err = i2c_smbus_read_i2c_block_data(c, MMA8450_OUT_X_LSB, 6, buff);
if (err < 0) {
dev_err(&c->dev,
"failed to read block data at 0x%02x, error %d\n",
MMA8450_OUT_X_LSB, err);
return err;
}
*x = ((buff[1] << 4) & 0xff0) | (buff[0] & 0xf);
*y = ((buff[3] << 4) & 0xff0) | (buff[2] & 0xf);
*z = ((buff[5] << 4) & 0xff0) | (buff[4] & 0xf);
return 0;
}
static void mma8450_poll(struct input_polled_dev *dev)
{
struct mma8450 *m = dev->private;
int x, y, z;
int ret;
int err;
ret = mma8450_read(m, MMA8450_STATUS);
if (ret < 0)
return;
if (!(ret & MMA8450_STATUS_ZXYDR))
return;
err = mma8450_read_xyz(m, &x, &y, &z);
if (err)
return;
input_report_abs(dev->input, ABS_X, x);
input_report_abs(dev->input, ABS_Y, y);
input_report_abs(dev->input, ABS_Z, z);
input_sync(dev->input);
}
/* Initialize the MMA8450 chip */
static void mma8450_open(struct input_polled_dev *dev)
{
struct mma8450 *m = dev->private;
int err;
/* enable all events from X/Y/Z, no FIFO */
err = mma8450_write(m, MMA8450_XYZ_DATA_CFG, 0x07);
if (err)
return;
/*
* Sleep mode poll rate - 50Hz
* System output data rate - 400Hz
* Full scale selection - Active, +/- 2G
*/
err = mma8450_write(m, MMA8450_CTRL_REG1, 0x01);
if (err < 0)
return;
msleep(MODE_CHANGE_DELAY_MS);
}
static void mma8450_close(struct input_polled_dev *dev)
{
struct mma8450 *m = dev->private;
mma8450_write(m, MMA8450_CTRL_REG1, 0x00);
mma8450_write(m, MMA8450_CTRL_REG2, 0x01);
}
/*
* I2C init/probing/exit functions
*/
static int __devinit mma8450_probe(struct i2c_client *c,
const struct i2c_device_id *id)
{
struct input_polled_dev *idev;
struct mma8450 *m;
int err;
m = kzalloc(sizeof(struct mma8450), GFP_KERNEL);
idev = input_allocate_polled_device();
if (!m || !idev) {
err = -ENOMEM;
goto err_free_mem;
}
m->client = c;
m->idev = idev;
idev->private = m;
idev->input->name = MMA8450_DRV_NAME;
idev->input->id.bustype = BUS_I2C;
idev->poll = mma8450_poll;
idev->poll_interval = POLL_INTERVAL;
idev->poll_interval_max = POLL_INTERVAL_MAX;
idev->open = mma8450_open;
idev->close = mma8450_close;
__set_bit(EV_ABS, idev->input->evbit);
input_set_abs_params(idev->input, ABS_X, -2048, 2047, 32, 32);
input_set_abs_params(idev->input, ABS_Y, -2048, 2047, 32, 32);
input_set_abs_params(idev->input, ABS_Z, -2048, 2047, 32, 32);
err = input_register_polled_device(idev);
if (err) {
dev_err(&c->dev, "failed to register polled input device\n");
goto err_free_mem;
}
return 0;
err_free_mem:
input_free_polled_device(idev);
kfree(m);
return err;
}
static int __devexit mma8450_remove(struct i2c_client *c)
{
struct mma8450 *m = i2c_get_clientdata(c);
struct input_polled_dev *idev = m->idev;
input_unregister_polled_device(idev);
input_free_polled_device(idev);
kfree(m);
return 0;
}
static const struct i2c_device_id mma8450_id[] = {
{ MMA8450_DRV_NAME, 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, mma8450_id);
static struct i2c_driver mma8450_driver = {
.driver = {
.name = MMA8450_DRV_NAME,
.owner = THIS_MODULE,
},
.probe = mma8450_probe,
.remove = __devexit_p(mma8450_remove),
.id_table = mma8450_id,
};
static int __init mma8450_init(void)
{
return i2c_add_driver(&mma8450_driver);
}
module_init(mma8450_init);
static void __exit mma8450_exit(void)
{
i2c_del_driver(&mma8450_driver);
}
module_exit(mma8450_exit);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("MMA8450 3-Axis Accelerometer Driver");
MODULE_LICENSE("GPL");