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iio: add driver for Freescale MMA9551L 

Add support for Freescale MMA9551L Intelligent Motion-Sensing Platform.
The driver supports raw reads for acceleration and inclination, as well
as configuring inclination rate-of-change events.  The events can be
used similarly to an Android sensor Tilt event.

The specifications can be downloaded from:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA955xLSWRM.pdf

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Vlad Dogaru 2014-11-24 11:43:15 +02:00 committed by Jonathan Cameron
parent 7f1c2cbbda
commit c78b917163
3 changed files with 965 additions and 0 deletions
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10
drivers/iio/accel/Kconfig
View File

@ -105,4 +105,14 @@ config KXCJK1013
To compile this driver as a module, choose M here: the module will
be called kxcjk-1013.
config MMA9551
tristate "Freescale MMA9551L Intelligent Motion-Sensing Platform Driver"
depends on I2C
help
Say yes here to build support for the Freescale MMA9551L
Intelligent Motion-Sensing Platform Driver.
To compile this driver as a module, choose M here: the module
will be called mma9551.
endmenu

1
drivers/iio/accel/Makefile
View File

@ -9,6 +9,7 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
obj-$(CONFIG_KXSD9) += kxsd9.o
obj-$(CONFIG_MMA8452) += mma8452.o
obj-$(CONFIG_MMA9551) += mma9551.o
obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
st_accel-y := st_accel_core.o

954
drivers/iio/accel/mma9551.c Normal file
View File

@ -0,0 +1,954 @@
/*
* Freescale MMA9551L Intelligent Motion-Sensing Platform driver
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#define MMA9551_DRV_NAME "mma9551"
#define MMA9551_IRQ_NAME "mma9551_event"
#define MMA9551_GPIO_NAME "mma9551_int"
#define MMA9551_GPIO_COUNT 4
/* Applications IDs */
#define MMA9551_APPID_VERSION 0x00
#define MMA9551_APPID_GPIO 0x03
#define MMA9551_APPID_AFE 0x06
#define MMA9551_APPID_TILT 0x0B
#define MMA9551_APPID_SLEEP_WAKE 0x12
#define MMA9551_APPID_RESET 0x17
#define MMA9551_APPID_NONE 0xff
/* Command masks for mailbox write command */
#define MMA9551_CMD_READ_VERSION_INFO 0x00
#define MMA9551_CMD_READ_CONFIG 0x10
#define MMA9551_CMD_WRITE_CONFIG 0x20
#define MMA9551_CMD_READ_STATUS 0x30
enum mma9551_gpio_pin {
mma9551_gpio6 = 0,
mma9551_gpio7,
mma9551_gpio8,
mma9551_gpio9,
mma9551_gpio_max = mma9551_gpio9,
};
/* Mailbox read command */
#define MMA9551_RESPONSE_COCO BIT(7)
/* Error-Status codes returned in mailbox read command */
#define MMA9551_MCI_ERROR_NONE 0x00
#define MMA9551_MCI_ERROR_PARAM 0x04
#define MMA9551_MCI_INVALID_COUNT 0x19
#define MMA9551_MCI_ERROR_COMMAND 0x1C
#define MMA9551_MCI_ERROR_INVALID_LENGTH 0x21
#define MMA9551_MCI_ERROR_FIFO_BUSY 0x22
#define MMA9551_MCI_ERROR_FIFO_ALLOCATED 0x23
#define MMA9551_MCI_ERROR_FIFO_OVERSIZE 0x24
/* GPIO Application */
#define MMA9551_GPIO_POL_MSB 0x08
#define MMA9551_GPIO_POL_LSB 0x09
/* Sleep/Wake application */
#define MMA9551_SLEEP_CFG 0x06
#define MMA9551_SLEEP_CFG_SNCEN BIT(0)
#define MMA9551_SLEEP_CFG_SCHEN BIT(2)
/* AFE application */
#define MMA9551_AFE_X_ACCEL_REG 0x00
#define MMA9551_AFE_Y_ACCEL_REG 0x02
#define MMA9551_AFE_Z_ACCEL_REG 0x04
/* Tilt application (inclination in IIO terms). */
#define MMA9551_TILT_XZ_ANG_REG 0x00
#define MMA9551_TILT_YZ_ANG_REG 0x01
#define MMA9551_TILT_XY_ANG_REG 0x02
#define MMA9551_TILT_ANGFLG BIT(7)
#define MMA9551_TILT_QUAD_REG 0x03
#define MMA9551_TILT_XY_QUAD_SHIFT 0
#define MMA9551_TILT_YZ_QUAD_SHIFT 2
#define MMA9551_TILT_XZ_QUAD_SHIFT 4
#define MMA9551_TILT_CFG_REG 0x01
#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
/* Tilt events are mapped to the first three GPIO pins. */
enum mma9551_tilt_axis {
mma9551_x = 0,
mma9551_y,
mma9551_z,
};
/*
* A response is composed of:
* - control registers: MB0-3
* - data registers: MB4-31
*
* A request is composed of:
* - mbox to write to (always 0)
* - control registers: MB1-4
* - data registers: MB5-31
*/
#define MMA9551_MAILBOX_CTRL_REGS 4
#define MMA9551_MAX_MAILBOX_DATA_REGS 28
#define MMA9551_MAILBOX_REGS 32
#define MMA9551_I2C_READ_RETRIES 5
#define MMA9551_I2C_READ_DELAY 50 /* us */
struct mma9551_mbox_request {
u8 start_mbox; /* Always 0. */
u8 app_id;
/*
* See Section 5.3.1 of the MMA955xL Software Reference Manual.
*
* Bit 7: reserved, always 0
* Bits 6-4: command
* Bits 3-0: upper bits of register offset
*/
u8 cmd_off;
u8 lower_off;
u8 nbytes;
u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1];
} __packed;
struct mma9551_mbox_response {
u8 app_id;
/*
* See Section 5.3.3 of the MMA955xL Software Reference Manual.
*
* Bit 7: COCO
* Bits 6-0: Error code.
*/
u8 coco_err;
u8 nbytes;
u8 req_bytes;
u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS];
} __packed;
struct mma9551_version_info {
__be32 device_id;
u8 rom_version[2];
u8 fw_version[2];
u8 hw_version[2];
u8 fw_build[2];
};
struct mma9551_data {
struct i2c_client *client;
struct mutex mutex;
int event_enabled[3];
int irqs[MMA9551_GPIO_COUNT];
};
static int mma9551_transfer(struct i2c_client *client,
u8 app_id, u8 command, u16 offset,
u8 *inbytes, int num_inbytes,
u8 *outbytes, int num_outbytes)
{
struct mma9551_mbox_request req;
struct mma9551_mbox_response rsp;
struct i2c_msg in, out;
u8 req_len, err_code;
int ret, retries;
if (offset >= 1 << 12) {
dev_err(&client->dev, "register offset too large\n");
return -EINVAL;
}
req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes;
req.start_mbox = 0;
req.app_id = app_id;
req.cmd_off = command | (offset >> 8);
req.lower_off = offset;
if (command == MMA9551_CMD_WRITE_CONFIG)
req.nbytes = num_inbytes;
else
req.nbytes = num_outbytes;
if (num_inbytes)
memcpy(req.buf, inbytes, num_inbytes);
out.addr = client->addr;
out.flags = 0;
out.len = req_len;
out.buf = (u8 *)&req;
ret = i2c_transfer(client->adapter, &out, 1);
if (ret < 0) {
dev_err(&client->dev, "i2c write failed\n");
return ret;
}
retries = MMA9551_I2C_READ_RETRIES;
do {
udelay(MMA9551_I2C_READ_DELAY);
in.addr = client->addr;
in.flags = I2C_M_RD;
in.len = sizeof(rsp);
in.buf = (u8 *)&rsp;
ret = i2c_transfer(client->adapter, &in, 1);
if (ret < 0) {
dev_err(&client->dev, "i2c read failed\n");
return ret;
}
if (rsp.coco_err & MMA9551_RESPONSE_COCO)
break;
} while (--retries > 0);
if (retries == 0) {
dev_err(&client->dev,
"timed out while waiting for command response\n");
return -ETIMEDOUT;
}
if (rsp.app_id != app_id) {
dev_err(&client->dev,
"app_id mismatch in response got %02x expected %02x\n",
rsp.app_id, app_id);
return -EINVAL;
}
err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO;
if (err_code != MMA9551_MCI_ERROR_NONE) {
dev_err(&client->dev, "read returned error %x\n", err_code);
return -EINVAL;
}
if (rsp.nbytes != rsp.req_bytes) {
dev_err(&client->dev,
"output length mismatch got %d expected %d\n",
rsp.nbytes, rsp.req_bytes);
return -EINVAL;
}
if (num_outbytes)
memcpy(outbytes, rsp.buf, num_outbytes);
return 0;
}
static int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
u16 reg, u8 *val)
{
return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
reg, NULL, 0, val, 1);
}
static int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
u16 reg, u8 val)
{
return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
&val, 1, NULL, 0);
}
static int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
u16 reg, u8 *val)
{
return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
reg, NULL, 0, val, 1);
}
static int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
u16 reg, u16 *val)
{
int ret;
__be16 v;
ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
reg, NULL, 0, (u8 *)&v, 2);
*val = be16_to_cpu(v);
return ret;
}
static int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
u16 reg, u8 mask, u8 val)
{
int ret;
u8 tmp, orig;
ret = mma9551_read_config_byte(client, app_id, reg, &orig);
if (ret < 0)
return ret;
tmp = orig & ~mask;
tmp |= val & mask;
if (tmp == orig)
return 0;
return mma9551_write_config_byte(client, app_id, reg, tmp);
}
/*
* The polarity parameter is described in section 6.2.2, page 66, of the
* Software Reference Manual. Basically, polarity=0 means the interrupt
* line has the same value as the selected bit, while polarity=1 means
* the line is inverted.
*/
static int mma9551_gpio_config(struct i2c_client *client,
enum mma9551_gpio_pin pin,
u8 app_id, u8 bitnum, int polarity)
{
u8 reg, pol_mask, pol_val;
int ret;
if (pin > mma9551_gpio_max) {
dev_err(&client->dev, "bad GPIO pin\n");
return -EINVAL;
}
/*
* Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
* 0x03, and so on.
*/
reg = pin * 2;
ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
reg, app_id);
if (ret < 0) {
dev_err(&client->dev, "error setting GPIO app_id\n");
return ret;
}
ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
reg + 1, bitnum);
if (ret < 0) {
dev_err(&client->dev, "error setting GPIO bit number\n");
return ret;
}
switch (pin) {
case mma9551_gpio6:
reg = MMA9551_GPIO_POL_LSB;
pol_mask = 1 << 6;
break;
case mma9551_gpio7:
reg = MMA9551_GPIO_POL_LSB;
pol_mask = 1 << 7;
break;
case mma9551_gpio8:
reg = MMA9551_GPIO_POL_MSB;
pol_mask = 1 << 0;
break;
case mma9551_gpio9:
reg = MMA9551_GPIO_POL_MSB;
pol_mask = 1 << 1;
break;
}
pol_val = polarity ? pol_mask : 0;
ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
pol_mask, pol_val);
if (ret < 0)
dev_err(&client->dev, "error setting GPIO polarity\n");
return ret;
}
static int mma9551_read_version(struct i2c_client *client)
{
struct mma9551_version_info info;
int ret;
ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
NULL, 0, (u8 *)&info, sizeof(info));
if (ret < 0)
return ret;
dev_info(&client->dev, "Device ID 0x%x, firmware version %02x.%02x\n",
be32_to_cpu(info.device_id), info.fw_version[0],
info.fw_version[1]);
return 0;
}
/*
* Use 'false' as the second parameter to cause the device to enter
* sleep.
*/
static int mma9551_set_device_state(struct i2c_client *client,
bool enable)
{
return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
MMA9551_SLEEP_CFG,
MMA9551_SLEEP_CFG_SNCEN,
enable ? 0 : MMA9551_SLEEP_CFG_SNCEN);
}
static int mma9551_read_incli_chan(struct i2c_client *client,
const struct iio_chan_spec *chan,
int *val)
{
u8 quad_shift, angle, quadrant;
u16 reg_addr;
int ret;
switch (chan->channel2) {
case IIO_MOD_X:
reg_addr = MMA9551_TILT_YZ_ANG_REG;
quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
break;
case IIO_MOD_Y:
reg_addr = MMA9551_TILT_XZ_ANG_REG;
quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
break;
case IIO_MOD_Z:
reg_addr = MMA9551_TILT_XY_ANG_REG;
quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
break;
default:
return -EINVAL;
}
ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
reg_addr, &angle);
if (ret < 0)
return ret;
ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
MMA9551_TILT_QUAD_REG, &quadrant);
if (ret < 0)
return ret;
angle &= ~MMA9551_TILT_ANGFLG;
quadrant = (quadrant >> quad_shift) & 0x03;
if (quadrant == 1 || quadrant == 3)
*val = 90 * (quadrant + 1) - angle;
else
*val = angle + 90 * quadrant;
return IIO_VAL_INT;
}
static int mma9551_read_accel_chan(struct i2c_client *client,
const struct iio_chan_spec *chan,
int *val, int *val2)
{
u16 reg_addr;
s16 raw_accel;
int ret;
switch (chan->channel2) {
case IIO_MOD_X:
reg_addr = MMA9551_AFE_X_ACCEL_REG;
break;
case IIO_MOD_Y:
reg_addr = MMA9551_AFE_Y_ACCEL_REG;
break;
case IIO_MOD_Z:
reg_addr = MMA9551_AFE_Z_ACCEL_REG;
break;
default:
return -EINVAL;
}
ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
reg_addr, &raw_accel);
if (ret < 0)
return ret;
*val = raw_accel;
return IIO_VAL_INT;
}
static int mma9551_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_INCLI:
mutex_lock(&data->mutex);
ret = mma9551_read_incli_chan(data->client, chan, val);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_ACCEL:
mutex_lock(&data->mutex);
ret = mma9551_read_accel_chan(data->client,
chan, val, val2);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ACCEL:
*val = 0;
*val2 = 2440;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int mma9551_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct mma9551_data *data = iio_priv(indio_dev);
switch (chan->type) {
case IIO_INCLI:
/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
return data->event_enabled[chan->channel2 - 1];
default:
return -EINVAL;
}
}
static int mma9551_config_incli_event(struct iio_dev *indio_dev,
enum iio_modifier axis,
int state)
{
struct mma9551_data *data = iio_priv(indio_dev);
enum mma9551_tilt_axis mma_axis;
int ret;
/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
mma_axis = axis - 1;
if (data->event_enabled[mma_axis] == state)
return 0;
if (state == 0) {
ret = mma9551_gpio_config(data->client, mma_axis,
MMA9551_APPID_NONE, 0, 0);
if (ret < 0)
return ret;
} else {
int bitnum;
/* Bit 7 of each angle register holds the angle flag. */
switch (axis) {
case IIO_MOD_X:
bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
break;
case IIO_MOD_Y:
bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
break;
case IIO_MOD_Z:
bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
break;
default:
return -EINVAL;
}
ret = mma9551_gpio_config(data->client, mma_axis,
MMA9551_APPID_TILT, bitnum, 0);
if (ret < 0)
return ret;
}
data->event_enabled[mma_axis] = state;
return ret;
}
static int mma9551_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
switch (chan->type) {
case IIO_INCLI:
mutex_lock(&data->mutex);
ret = mma9551_config_incli_event(indio_dev,
chan->channel2, state);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static int mma9551_write_event_value(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
switch (chan->type) {
case IIO_INCLI:
if (val2 != 0 || val < 1 || val > 10)
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9551_update_config_bits(data->client,
MMA9551_APPID_TILT,
MMA9551_TILT_CFG_REG,
MMA9551_TILT_ANG_THRESH_MASK,
val);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static int mma9551_read_event_value(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
u8 tmp;
switch (chan->type) {
case IIO_INCLI:
mutex_lock(&data->mutex);
ret = mma9551_read_config_byte(data->client,
MMA9551_APPID_TILT,
MMA9551_TILT_CFG_REG, &tmp);
mutex_unlock(&data->mutex);
if (ret < 0)
return ret;
*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
*val2 = 0;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static const struct iio_event_spec mma9551_incli_event = {
.type = IIO_EV_TYPE_ROC,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
};
#define MMA9551_ACCEL_CHANNEL(axis) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
}
#define MMA9551_INCLI_CHANNEL(axis) { \
.type = IIO_INCLI, \
.modified = 1, \
.channel2 = axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
.event_spec = &mma9551_incli_event, \
.num_event_specs = 1, \
}
static const struct iio_chan_spec mma9551_channels[] = {
MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
MMA9551_INCLI_CHANNEL(IIO_MOD_X),
MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
};
static const struct iio_info mma9551_info = {
.driver_module = THIS_MODULE,
.read_raw = mma9551_read_raw,
.read_event_config = mma9551_read_event_config,
.write_event_config = mma9551_write_event_config,
.read_event_value = mma9551_read_event_value,
.write_event_value = mma9551_write_event_value,
};
static irqreturn_t mma9551_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct mma9551_data *data = iio_priv(indio_dev);
int i, ret, mma_axis = -1;
u16 reg;
u8 val;
mutex_lock(&data->mutex);
for (i = 0; i < 3; i++)
if (irq == data->irqs[i]) {
mma_axis = i;
break;
}
if (mma_axis == -1) {
/* IRQ was triggered on 4th line, which we don't use. */
dev_warn(&data->client->dev,
"irq triggered on unused line %d\n", data->irqs[3]);
goto out;
}
switch (mma_axis) {
case mma9551_x:
reg = MMA9551_TILT_YZ_ANG_REG;
break;
case mma9551_y:
reg = MMA9551_TILT_XZ_ANG_REG;
break;
case mma9551_z:
reg = MMA9551_TILT_XY_ANG_REG;
break;
}
/*
* Read the angle even though we don't use it, otherwise we
* won't get any further interrupts.
*/
ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
reg, &val);
if (ret < 0) {
dev_err(&data->client->dev,
"error %d reading tilt register in IRQ\n", ret);
goto out;
}
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
iio_get_time_ns());
out:
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
static int mma9551_init(struct mma9551_data *data)
{
int ret;
ret = mma9551_read_version(data->client);
if (ret)
return ret;
/* Power on chip and enable doze mode. */
return mma9551_update_config_bits(data->client,
MMA9551_APPID_SLEEP_WAKE,
MMA9551_SLEEP_CFG,
MMA9551_SLEEP_CFG_SCHEN | MMA9551_SLEEP_CFG_SNCEN,
MMA9551_SLEEP_CFG_SCHEN);
}
static int mma9551_gpio_probe(struct iio_dev *indio_dev)
{
struct gpio_desc *gpio;
int i, ret;
struct mma9551_data *data = iio_priv(indio_dev);
struct device *dev = &data->client->dev;
for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i);
if (IS_ERR(gpio)) {
dev_err(dev, "acpi gpio get index failed\n");
return PTR_ERR(gpio);
}
ret = gpiod_direction_input(gpio);
if (ret)
return ret;
data->irqs[i] = gpiod_to_irq(gpio);
ret = devm_request_threaded_irq(dev, data->irqs[i],
NULL, mma9551_event_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
MMA9551_IRQ_NAME, indio_dev);
if (ret < 0) {
dev_err(dev, "request irq %d failed\n", data->irqs[i]);
return ret;
}
dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
desc_to_gpio(gpio), data->irqs[i]);
}
return 0;
}
static const char *mma9551_match_acpi_device(struct device *dev)
{
const struct acpi_device_id *id;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return NULL;
return dev_name(dev);
}
static int mma9551_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mma9551_data *data;
struct iio_dev *indio_dev;
const char *name = NULL;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
if (id)
name = id->name;
else if (ACPI_HANDLE(&client->dev))
name = mma9551_match_acpi_device(&client->dev);
ret = mma9551_init(data);
if (ret < 0)
return ret;
mutex_init(&data->mutex);
indio_dev->dev.parent = &client->dev;
indio_dev->channels = mma9551_channels;
indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &mma9551_info;
ret = mma9551_gpio_probe(indio_dev);
if (ret < 0)
goto out_poweroff;
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "unable to register iio device\n");
goto out_poweroff;
}
return 0;
out_poweroff:
mma9551_set_device_state(client, false);
return ret;
}
static int mma9551_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct mma9551_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
mutex_lock(&data->mutex);
mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mma9551_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9551_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
return 0;
}
static int mma9551_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9551_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
mma9551_set_device_state(data->client, true);
mutex_unlock(&data->mutex);
return 0;
}
#else
#define mma9551_suspend NULL
#define mma9551_resume NULL
#endif
static const struct dev_pm_ops mma9551_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
};
static const struct acpi_device_id mma9551_acpi_match[] = {
{"MMA9551", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
static const struct i2c_device_id mma9551_id[] = {
{"mma9551", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mma9551_id);
static struct i2c_driver mma9551_driver = {
.driver = {
.name = MMA9551_DRV_NAME,
.acpi_match_table = ACPI_PTR(mma9551_acpi_match),
.pm = &mma9551_pm_ops,
},
.probe = mma9551_probe,
.remove = mma9551_remove,
.id_table = mma9551_id,
};
module_i2c_driver(mma9551_driver);
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");