Re: PATCH V4 1/2] input: CMA3000 Accelerometer Driver

[Jonathan Cameron]

On 11/29/10 10:57, Hemanth V wrote:
>>From 9985dc1211ae33baa877489c26920dfd1c29bb35 Mon Sep 17 00:00:00 2001
> From: Hemanth V <hemanthv@xxxxxx>
> Date: Thu, 26 Aug 2010 17:44:48 +0530
> Subject: [PATCH] input: 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.
> 
> Driver reports acceleration data through input subsystem

Couple of nitpicks inline.  There's one unneeded NULL assignment
that should probably be cleaned up. I'd also like to see actual
part numbers listed somewhere in the Kconfig help text.

The removal of various temporary variables is something I know
at least one other reviewer has commented on.  Basically they may
make the code look cleaner, but they add (marginally) to the
review burden and that's annoys reviewers ;)

Anyhow, all the comments are trivial. Nice driver Hemanth.

Dmitry: This is clean and for now has none of the controversial
sysfs interfaces so baring the input bits (which I'm not as
familiar with and you might want to glance over) this looks
ready to merge to me.
> 
> Signed-off-by: Hemanth V <hemanthv@xxxxxx>
> Reviewed-by: Jonathan Cameron <jic23@xxxxxxxxx>
> Reviewed-by: Sergio Aguirre <saaguirre@xxxxxx>
> Reviewed-by: Shubhrajyoti <Shubhrajyoti@xxxxxx>
Acked-by: Jonathan Cameron <jic23@xxxxxxxxx>

(no idea if the convention is to remove the Reviewed-by when
someone has acked or not...)
> ---
> This is V4 of patch, which currently doesnot support a
> sysfs interface. Discussions are ongoing to create a
> standard sysfs interface for sensors under input subsystem.
> This interface would be adopted by the driver subsequently.
> 
>  Documentation/input/cma3000_d0x.txt  |  115 ++++++++++++
>  drivers/input/misc/Kconfig           |   24 +++
>  drivers/input/misc/Makefile          |    2 +
>  drivers/input/misc/cma3000_d0x.c     |  334 ++++++++++++++++++++++++++++++++++
>  drivers/input/misc/cma3000_d0x.h     |   53 ++++++
>  drivers/input/misc/cma3000_d0x_i2c.c |  142 ++++++++++++++
>  include/linux/input/cma3000.h        |   60 ++++++
>  7 files changed, 730 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/input/cma3000_d0x.txt
>  create mode 100644 drivers/input/misc/cma3000_d0x.c
>  create mode 100644 drivers/input/misc/cma3000_d0x.h
>  create mode 100644 drivers/input/misc/cma3000_d0x_i2c.c
>  create mode 100644 include/linux/input/cma3000.h
> 
> diff --git a/Documentation/input/cma3000_d0x.txt b/Documentation/input/cma3000_d0x.txt
> new file mode 100644
> index 0000000..9cc46af
> --- /dev/null
> +++ b/Documentation/input/cma3000_d0x.txt
> @@ -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@xxxxxx>
> +
> +
> +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 intented 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)
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index b99b8cb..d5e5fd6 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -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.
Usual convention is to ensure all known part codes are listed in the
help text if not in the short form above.  Makes it easy to grep for
a particular part.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called cma3000_d0x_i2c.
> +
>  endif
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 1fe1f6c..35bcfe4 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -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
> diff --git a/drivers/input/misc/cma3000_d0x.c b/drivers/input/misc/cma3000_d0x.c
> new file mode 100644
> index 0000000..158add9
> --- /dev/null
> +++ b/drivers/input/misc/cma3000_d0x.c
> @@ -0,0 +1,334 @@
> +/*
> + * cma3000_d0x.c
> + * VTI CMA3000_D0x Accelerometer driver
> + *	Supports I2C interface
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@xxxxxx>
> + *
> + * 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/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/input.h>
> +#include <linux/platform_device.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
> +
> +#define CMA3000_READ(data, reg, msg) \
> +	((data)->bus_ops->read(data, reg, msg))
> +#define CMA3000_SET(data, reg, val, msg) \
> +	((data)->bus_ops->write(data, 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 ret;
> +
> +	/* 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);
> +
> +	ret = CMA3000_READ(data, CMA3000_STATUS, "Status");
> +	if (ret < 0) {
> +		dev_err(&data->client->dev, "Reset failed\n");
> +		return ret;
> +	} else if (ret & CMA3000_STATUS_PERR) {
> +		dev_err(&data->client->dev, "Parity Error\n");
> +		return -EIO;
> +	} else {
> +		return 0;
> +	}
> +}
> +
> +int cma3000_poweron(struct cma3000_accl_data *data)
> +{
> +	uint8_t ctrl = 0, mdthr, mdfftmr, ffthr, mode;
> +	int g_range, ret;
> +
Again (not I review from the end of patches ;)
I really don't see the point in these. They just make things
more confusing for a reviewer. Just use data->pdata.whatever
directly.
> +	g_range = data->pdata.g_range;
> +	mode = data->pdata.mode;
> +	mdthr = data->pdata.mdthr;
> +	mdfftmr = data->pdata.mdfftmr;
> +	ffthr = data->pdata.ffthr;
> +
> +	if (mode < CMAMODE_DEFAULT || mode > CMAMODE_POFF) {
> +		data->pdata.mode = CMAMODE_MOTDET;
> +		mode = data->pdata.mode;
> +		dev_info(&data->client->dev,
> +			"Invalid mode specified, assuming Motion Detect\n");
> +	}
> +
> +	if (g_range == CMARANGE_2G) {
> +		ctrl = (mode << 1) | CMA3000_RANGE2G;
> +	} else if (g_range == CMARANGE_8G) {
> +		ctrl = (mode << 1) | CMA3000_RANGE8G;
> +	} else {
> +		dev_info(&data->client->dev,
> +			"Invalid G range specified, assuming 8G\n");
> +		ctrl = (mode << 1) | CMA3000_RANGE8G;
Personally I'd drop out of the registration for this. If that element
of the platform data isn't there to my mind it means that it isn't being
correctly handled by the platform data.
This one is definitely a personal view though so feel free to ignore me!
> +		data->pdata.g_range = CMARANGE_8G;
> +	}
> +#if defined CONFIG_INPUT_CMA3000_I2C || defined CONFIG_INPUT_CMA3000_I2C_MODULE
> +	ctrl |= CMA3000_BUSI2C;
> +#endif
> +
> +	CMA3000_SET(data, CMA3000_MDTHR, mdthr, "Motion Detect Threshold");
> +	CMA3000_SET(data, CMA3000_MDFFTMR, mdfftmr, "Time register");
> +	CMA3000_SET(data, CMA3000_FFTHR, ffthr, "Free fall threshold");
> +	ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
Why eat the error by replacing it with another one and why are we
only allowed an error from the last one?  
> +	if (ret < 0)
> +		return -EIO;
> +
> +	msleep(CMA3000_SETDELAY);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(cma3000_poweron);
> +
> +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;
> +}
> +EXPORT_SYMBOL(cma3000_poweroff);
> +
> +int cma3000_init(struct cma3000_accl_data *data)
> +{
> +	int ret = 0, fuzz_x, fuzz_y, fuzz_z, g_range;
> +	uint32_t irqflags;
> +
> +	if (data->client->dev.platform_data == NULL) {
> +		dev_err(&data->client->dev, "platform data not found\n");
> +		ret = -EINVAL;
> +		goto err_op1_failed;
> +	}
> +
> +	/* if no IRQ return error */
> +	if (data->client->irq == 0) {
> +		ret = -EINVAL;
> +		goto err_op1_failed;
> +	}
> +
> +	memcpy(&(data->pdata), data->client->dev.platform_data,
> +		sizeof(struct cma3000_platform_data));
> +
> +	ret = cma3000_reset(data);
> +	if (ret)
> +		goto err_op1_failed;
> +
> +	ret = CMA3000_READ(data, CMA3000_REVID, "Revid");
> +	if (ret < 0)
> +		goto err_op1_failed;
> +
> +	pr_info("CMA3000 Accelerometer : Revision %x\n", ret);
> +
> +	/* Bring it out of default power down state */
> +	ret = cma3000_poweron(data);
> +	if (ret < 0)
> +		goto err_op1_failed;
> +
> +	fuzz_x = data->pdata.fuzz_x;
> +	fuzz_y = data->pdata.fuzz_y;
> +	fuzz_z = data->pdata.fuzz_z;
> +	g_range = data->pdata.g_range;
> +	irqflags = data->pdata.irqflags;
Personally I'm still against these local variables existing.
They add a layer of abstraction that doesn't do anyone any
good so I'd just used the pdata directly in the calls.
Not an important point though. Just makes anyone reviewing
the driver check to see where these all go.

> +
> +	data->input_dev = input_allocate_device();
> +	if (data->input_dev == NULL) {
> +		ret = -ENOMEM;
> +		dev_err(&data->client->dev,
> +			"Failed to allocate input device\n");
> +		goto err_op1_failed;
> +	}
> +
> +	data->input_dev->name = "cma3000-accelerometer";
> +
> +#if defined CONFIG_INPUT_CMA3000_I2C || defined CONFIG_INPUT_CMA3000_I2C_MODULE
> +	data->input_dev->id.bustype = BUS_I2C;
> +#endif
> +
> +	 __set_bit(EV_ABS, data->input_dev->evbit);
> +	 __set_bit(EV_MSC, data->input_dev->evbit);
> +
> +	input_set_abs_params(data->input_dev, ABS_X, -g_range,
> +				g_range, fuzz_x, 0);
> +	input_set_abs_params(data->input_dev, ABS_Y, -g_range,
> +				g_range, fuzz_y, 0);
> +	input_set_abs_params(data->input_dev, ABS_Z, -g_range,
> +				g_range, fuzz_z, 0);
> +	input_set_abs_params(data->input_dev, ABS_MISC, 0,
> +				1, 0, 0);
> +
> +	mutex_init(&data->mutex);
> +
> +	ret = request_threaded_irq(data->client->irq, NULL,
> +				cma3000_thread_irq,
> +				irqflags | IRQF_ONESHOT,
> +				data->client->name, data);
> +
> +	if (ret < 0) {
> +		dev_err(&data->client->dev,
> +			"request_threaded_irq failed\n");
> +		goto err_op2_failed;
> +	}
> +
> +	ret = input_register_device(data->input_dev);
> +	if (ret) {
> +		dev_err(&data->client->dev,
> +			"Unable to register input device\n");
> +		goto err_op3_failed;
> +	}
> +
> +	return 0;
> +
> +err_op3_failed:
> +	free_irq(data->client->irq, data);
> +err_op2_failed:
> +	mutex_destroy(&data->mutex);
> +err_op1_failed:
> +	input_free_device(data->input_dev);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(cma3000_init);
> +
> +int cma3000_exit(struct cma3000_accl_data *data)
> +{
> +	int ret;
> +
> +	ret = cma3000_poweroff(data);
> +	free_irq(data->client->irq, data);
> +	mutex_destroy(&data->mutex);
> +	input_unregister_device(data->input_dev);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL(cma3000_exit);
> +
> +MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Hemanth V <hemanthv@xxxxxx>");
> diff --git a/drivers/input/misc/cma3000_d0x.h b/drivers/input/misc/cma3000_d0x.h
> new file mode 100644
> index 0000000..107b5fa
> --- /dev/null
> +++ b/drivers/input/misc/cma3000_d0x.h
> @@ -0,0 +1,53 @@
> +/*
> + * cma3000_d0x.h
> + * VTI CMA3000_D0x Accelerometer driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@xxxxxx>
> + *
> + * 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/i2c.h>
> +#include <linux/input.h>
> +
> +struct cma3000_accl_data;
> +
> +struct cma3000_bus_ops {
> +	u16 bustype;
> +	int (*read) (struct cma3000_accl_data *, u8, char *);
> +	int (*write) (struct cma3000_accl_data *, u8, u8, char *);
> +};
> +
> +struct cma3000_accl_data {
> +#if defined CONFIG_INPUT_CMA3000_I2C || defined CONFIG_INPUT_CMA3000_I2C_MODULE
> +	struct i2c_client *client;
> +#endif
> +	struct input_dev *input_dev;
> +	struct cma3000_platform_data pdata;
> +
> +	/* mutex for sysfs operations */
> +	struct mutex mutex;
> +	const struct cma3000_bus_ops *bus_ops;
> +	int bit_to_mg;
> +};
> +
> +int cma3000_init(struct cma3000_accl_data *);
> +int cma3000_exit(struct cma3000_accl_data *);
> +int cma3000_poweron(struct cma3000_accl_data *);
> +int cma3000_poweroff(struct cma3000_accl_data *);
> +
> +#endif
> diff --git a/drivers/input/misc/cma3000_d0x_i2c.c b/drivers/input/misc/cma3000_d0x_i2c.c
> new file mode 100644
> index 0000000..f843478
> --- /dev/null
> +++ b/drivers/input/misc/cma3000_d0x_i2c.c
> @@ -0,0 +1,142 @@
> +/*
> + * cma3000_d0x_i2c.c
> + *
> + * Implements I2C interface for VTI CMA300_D0x Accelerometer driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@xxxxxx>
> + *
> + * 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/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/input/cma3000.h>
> +#include "cma3000_d0x.h"
> +
> +static int cma3000_set(struct cma3000_accl_data *accl, u8 reg, u8 val,
> +			char *msg)
> +{
> +	int ret = i2c_smbus_write_byte_data(accl->client, reg, val);
> +	if (ret < 0)
> +		dev_err(&accl->client->dev,
> +			"i2c_smbus_write_byte_data failed (%s)\n", msg);
> +	return ret;
> +}
> +
> +static int cma3000_read(struct cma3000_accl_data *accl, u8 reg, char *msg)
> +{
> +	int ret = i2c_smbus_read_byte_data(accl->client, reg);
> +	if (ret < 0)
> +		dev_err(&accl->client->dev,
> +			"i2c_smbus_read_byte_data failed (%s)\n", msg);
> +	return ret;
> +}
> +
> +static const struct cma3000_bus_ops cma3000_i2c_bops = {
> +	.bustype = BUS_I2C,
> +	.read = cma3000_read,
> +	.write = cma3000_set,
> +};
> +
> +static int __devinit cma3000_accl_probe(struct i2c_client *client,
> +					const struct i2c_device_id *id)
> +{
> +	int ret;
> +	struct cma3000_accl_data *data = NULL;
Why the NULL assignment?
> +
> +	data = kzalloc(sizeof(*data), GFP_KERNEL);
> +	if (data == NULL) {
> +		ret = -ENOMEM;
> +		goto err_op_failed;
> +	}
> +
> +	data->client = client;
> +	i2c_set_clientdata(client, data);
> +	data->bus_ops = &cma3000_i2c_bops;
> +
> +	ret = cma3000_init(data);
> +	if (ret)
> +		goto err_op_failed;
> +
> +	return 0;
> +
> +err_op_failed:
> +
> +	kfree(data);
> +	return ret;
> +}
> +
> +static int __devexit cma3000_accl_remove(struct i2c_client *client)
> +{
> +	struct cma3000_accl_data *data = i2c_get_clientdata(client);
> +	int ret;
> +
> +	ret = cma3000_exit(data);
> +	i2c_set_clientdata(client, NULL);
> +	kfree(data);
> +
> +	return ret;
> +}
> +
> +#ifdef CONFIG_PM
> +static int cma3000_accl_suspend(struct i2c_client *client, pm_message_t mesg)
> +{
> +	struct cma3000_accl_data *data = i2c_get_clientdata(client);
> +
> +	return cma3000_poweroff(data);
> +}
> +
> +static int cma3000_accl_resume(struct i2c_client *client)
> +{
> +	struct cma3000_accl_data *data = i2c_get_clientdata(client);
> +
> +	return cma3000_poweron(data);
> +}
> +#endif
> +
> +static const struct i2c_device_id cma3000_id[] = {
> +	{ "cma3000_d01", 0 },
> +	{ },
> +};
> +
> +static struct i2c_driver cma3000_accl_driver = {
> +	.probe		= cma3000_accl_probe,
> +	.remove		= cma3000_accl_remove,
> +	.id_table	= cma3000_id,
> +#ifdef CONFIG_PM
> +	.suspend	= cma3000_accl_suspend,
> +	.resume		= cma3000_accl_resume,
> +#endif
> +	.driver = {
> +		.name = "cma3000_accl"
> +	},
> +};
> +
> +static int __init cma3000_accl_init(void)
> +{
> +	return i2c_add_driver(&cma3000_accl_driver);
> +}
> +
> +static void __exit cma3000_accl_exit(void)
> +{
> +	i2c_del_driver(&cma3000_accl_driver);
> +}
> +
> +module_init(cma3000_accl_init);
> +module_exit(cma3000_accl_exit);
> +
> +MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Hemanth V <hemanthv@xxxxxx>");
> diff --git a/include/linux/input/cma3000.h b/include/linux/input/cma3000.h
> new file mode 100644
> index 0000000..fcddece
> --- /dev/null
> +++ b/include/linux/input/cma3000.h
> @@ -0,0 +1,60 @@
> +/*
> + * cma3000.h
> + * VTI CMA3000_Dxx Accelerometer driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@xxxxxx>
> + *
> + * 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;
> +	uint32_t  irqflags;
> +};
> +
> +#endif

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