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SubjectRe: [RFC] [PATCH V2 1/2] input: CMA3000 Accelerometer driver
Date
----- Original Message ----- 
From: "Jonathan Cameron" <jic23@cam.ac.uk>
To: "Hemanth V" <hemanthv@ti.com>
Cc: <linux-input@vger.kernel.org>; <linux-kernel@vger.kernel.org>;
<linux-omap@vger.kernel.org>
Sent: Friday, May 21, 2010 5:27 PM
Subject: Re: [RFC] [PATCH V2 1/2] input: CMA3000 Accelerometer driver

> On 05/21/10 07:52, Hemanth V wrote:
>> From: Hemanth V <hemanthv@ti.com>
>> Date: Thu, 20 May 2010 20:18:17 +0530
>> Subject: [PATCH] input: CMA3000 Accelerometer Driver
>>
>> This patch adds 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 and supports
>> sysfs for configuration changes.
>>
>> This is V2 of patch, which fixes open source review comments
>>
>
> Hi,
>
> The driver is nice and clean.
>
> Still leaving aside the long argued question of whether this should be
> in input. If you care for my views on that there are plenty or other
> threads! There are a few things I'd still like to suggest:
> Attribute naming: The names you have gone with are way too short. The
> documentation helps, but if possible it is always nice to have
> names that are effectively human readable. 'mdfftmr' is rather
> cryptic! Also I know you aren't trying to write a general
> interface here, but it would be nice if the units of these
> magic attributes were not dependant on the current mode.
> The snag here is that this is a user visible interface, so it
> is rather frowned upon to change it later. I guess you could
> get away with adding some more attributes, say:
> mdfftmr_scale (which could just be a string and hence floating point)
>

I have tried to keep the same naming convention as mentioned in
product specs for easy reference.

> Documentation: I'd have prefered to see the sysfs attributes documented
> in Documentation/abi/ (but that is just a matter of personal
> taste. I don't think there are any hard and fast rules on this
> yet)
>
> I'm still not keen on naming the files with a wild card. Also, if the d0x
> is relevant, why is this not reflected in Kconfig?
>

Yes I can add it to Kconfig, basically this again comes from product
specs

> The one thing that really bothers me is the setting of a precendent
> wrt to the attribute naming.
>
> What you have here won't generalise well, particularly wrt to controls
> relating to the on chip motion and free fall detectors. We've been round
> the houses with this in IIO and I fully admit we still haven't gotten it
> right there. The advantage on this stuff that we have is that, as we
> are in staging, we can mess around the userspace abi till we get it right.
> In mainline things are by convention much more rigid!
>
> Still it's a good driver and obviously some of the above issues are pretty
> general.
>
> To that end, having stated my reservations, you can add
>
> Reviewed-by: Jonathan Cameron <jic23@cam.ac.uk>

Thanks, will add the same to patch


>
> (not ack as I'm indicating that whilst I think it is a worthwhile addition
> I'm not entirely happy with some aspects of the driver).
>
>
>> Signed-off-by: Hemanth V <hemanthv@ti.com>
>> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
>> ---
>> Documentation/input/cma3000_d0x.txt | 112 ++++++
>> drivers/input/misc/Kconfig | 7 +
>> drivers/input/misc/Makefile | 1 +
>> drivers/input/misc/cma3000_d0x.c | 633
>> ++++++++++++++++++++++++++++++++++
>> drivers/input/misc/cma3000_d0x.h | 46 +++
>> drivers/input/misc/cma3000_d0x_i2c.c | 136 ++++++++
>> include/linux/i2c/cma3000.h | 60 ++++
>> 7 files changed, 995 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/i2c/cma3000.h
>>
>> diff --git a/Documentation/input/cma3000_d0x.txt
>> b/Documentation/input/cma3000_d0x.txt
>> new file mode 100644
>> index 0000000..29ab6b7
>> --- /dev/null
>> +++ b/Documentation/input/cma3000_d0x.txt
>> @@ -0,0 +1,112 @@
>> +Kernel driver for CMA3000-D0x
>> +============================
>> +
>> +Supported chips:
>> +* VTI CMA3000-D0x
>> +Datasheet:
>> + CMA3000-D0X Product Family Specification 8281000A.02.pdf
>> +
>> +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 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 supports both I2C/SPI bus for communication, currently the
>> driver
>> +supports I2C based communication.
>> +
>> +Driver reports acceleration data through input subsystem and supports
>> sysfs
>> +for configuration changes. 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 threshold value
>> +
>> +mdfftmr: Motion detect and free fall time value
>> +
>> +ffthr: Free fall 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-acclerometer"
>> +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)
>> +
>> +Sysfs entries
>> +-------------
>> +
>> +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 1cf25ee..043ee8d 100755
>> --- a/drivers/input/misc/Kconfig
>> +++ b/drivers/input/misc/Kconfig
>> @@ -340,4 +340,11 @@
>> To compile this driver as a module, choose M here: the
>> module will be called pcap_keys.
>>
>> +config INPUT_CMA3000_I2C
>> + bool "VTI CMA3000 Tri-axis accelerometer"
>> + depends on I2C && SYSFS
>> + help
>> + Say Y here if you want to use VTI CMA3000 Accelerometer
>> + through I2C interface.
>> +
>> endif
>> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
>> index 07ee237..011161d 100644
>> --- a/drivers/input/misc/Makefile
>> +++ b/drivers/input/misc/Makefile
>> @@ -32,3 +32,4 @@
>> obj-$(CONFIG_INPUT_WISTRON_BTNS) += wistron_btns.o
>> obj-$(CONFIG_INPUT_WM831X_ON) += wm831x-on.o
>> obj-$(CONFIG_INPUT_YEALINK) += yealink.o
>> +obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x.o cma3000_d0x_i2c.o
>> diff --git a/drivers/input/misc/cma3000_d0x.c
>> b/drivers/input/misc/cma3000_d0x.c
>> new file mode 100644
>> index 0000000..812c464
>> --- /dev/null
>> +++ b/drivers/input/misc/cma3000_d0x.c
>> @@ -0,0 +1,633 @@
>> +/*
>> + * cma3000_d0x.c
>> + * VTI CMA3000_D0x Accelerometer driver
>> + * Supports I2C/SPI interfaces
>> + *
>> + * 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/interrupt.h>
>> +#include <linux/delay.h>
>> +#include <linux/input.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/i2c/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
>> +
>> +/*
>> + * 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 ssize_t cma3000_show_attr_mode(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + uint8_t mode;
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> +
>> + mode = cma3000_read(data, CMA3000_CTRL, "ctrl");
>> + if (mode < 0)
>> + return mode;
>> +
>> + return sprintf(buf, "%d\n", (mode & CMA3000_MODEMASK) >> 1);
>> +}
>> +
>> +static ssize_t cma3000_store_attr_mode(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> + unsigned long val;
>> + int error;
>> + uint8_t ctrl;
>> +
>> + error = strict_strtoul(buf, 0, &val);
>> + if (error)
>> + goto err_op3_failed;
>> +
>> + if (val < CMAMODE_DEFAULT || val > CMAMODE_POFF) {
>> + error = -EINVAL;
>> + goto err_op3_failed;
>> + }
>> +
>> + mutex_lock(&data->mutex);
>> + val &= (CMA3000_MODEMASK >> 1);
>> + ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
>> + if (ctrl < 0) {
>> + error = ctrl;
>> + goto err_op2_failed;
>> + }
>> +
>> + ctrl &= ~CMA3000_MODEMASK;
>> + ctrl |= (val << 1);
>> + data->pdata.mode = val;
>> + disable_irq(data->client->irq);
>> +
>> + error = cma3000_set(data, CMA3000_CTRL, ctrl, "ctrl");
>> + if (error < 0)
>> + goto err_op1_failed;
>> +
>> + /* Settling time delay required after mode change */
>> + msleep(CMA3000_SETDELAY);
>> +
>> + enable_irq(data->client->irq);
>> + mutex_unlock(&data->mutex);
>> + return count;
>> +
>> +err_op1_failed:
>> + enable_irq(data->client->irq);
>> +err_op2_failed:
>> + mutex_unlock(&data->mutex);
>> +err_op3_failed:
>> + return error;
>> +}
>> +
>> +static ssize_t cma3000_show_attr_grange(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + uint8_t mode;
>> + int g_range;
>> +
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> +
>> + mode = cma3000_read(data, CMA3000_CTRL, "ctrl");
>> + if (mode < 0)
>> + return mode;
>> +
>> + g_range = (mode & CMA3000_GRANGEMASK) ? CMARANGE_2G : CMARANGE_8G;
>> + return sprintf(buf, "%d\n", g_range);
>> +}
>> +
>> +static ssize_t cma3000_store_attr_grange(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> + unsigned long val;
>> + int error, g_range, fuzz_x, fuzz_y, fuzz_z;
>> + uint8_t ctrl;
>> +
>> + error = strict_strtoul(buf, 0, &val);
>> + if (error)
>> + goto err_op3_failed;
>> +
>> + mutex_lock(&data->mutex);
>> + ctrl = cma3000_read(data, CMA3000_CTRL, "ctrl");
>> + if (ctrl < 0) {
>> + error = ctrl;
>> + goto err_op2_failed;
>> + }
>> +
>> + ctrl &= ~CMA3000_GRANGEMASK;
>> +
>> + if (val == CMARANGE_2G) {
>> + ctrl |= CMA3000_RANGE2G;
>> + data->pdata.g_range = CMARANGE_2G;
>> + } else if (val == CMARANGE_8G) {
>> + ctrl |= CMA3000_RANGE8G;
>> + data->pdata.g_range = CMARANGE_8G;
>> + } else {
>> + error = -EINVAL;
>> + goto err_op2_failed;
>> + }
>> +
>> + g_range = data->pdata.g_range;
>> + fuzz_x = data->pdata.fuzz_x;
>> + fuzz_y = data->pdata.fuzz_y;
>> + fuzz_z = data->pdata.fuzz_z;
>> +
>> + disable_irq(data->client->irq);
>> + error = cma3000_set(data, CMA3000_CTRL, ctrl, "ctrl");
>> + if (error < 0)
>> + goto err_op1_failed;
>> +
>> + 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);
>> +
>> + enable_irq(data->client->irq);
>> + mutex_unlock(&data->mutex);
>> + return count;
>> +
>> +err_op1_failed:
>> + enable_irq(data->client->irq);
>> +err_op2_failed:
>> + mutex_unlock(&data->mutex);
>> +err_op3_failed:
>> + return error;
>> +}
>> +
>> +static ssize_t cma3000_show_attr_mdthr(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + uint8_t mode;
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> +
>> + mode = cma3000_read(data, CMA3000_MDTHR, "mdthr");
>> + if (mode < 0)
>> + return mode;
>> +
>> + return sprintf(buf, "%d\n", mode);
>> +}
>> +
>> +static ssize_t cma3000_store_attr_mdthr(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> + unsigned long val;
>> + int error;
>> +
>> + error = strict_strtoul(buf, 0, &val);
>> + if (error)
>> + return error;
>> +
>> + mutex_lock(&data->mutex);
>> + data->pdata.mdthr = val;
>> + disable_irq(data->client->irq);
>> + error = cma3000_set(data, CMA3000_MDTHR, val, "mdthr");
>> + enable_irq(data->client->irq);
>> + mutex_unlock(&data->mutex);
>> +
>> + /* If there was error during write, return error */
>> + if (error < 0)
>> + return error;
>> + else
>> + return count;
>> +}
>> +
>> +static ssize_t cma3000_show_attr_mdfftmr(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + uint8_t mode;
>> +
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> +
>> + mode = cma3000_read(data, CMA3000_MDFFTMR, "mdfftmr");
>> + if (mode < 0)
>> + return mode;
>> +
>> + return sprintf(buf, "%d\n", mode);
>> +}
>> +
>> +static ssize_t cma3000_store_attr_mdfftmr(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> + unsigned long val;
>> + int error;
>> +
>> + error = strict_strtoul(buf, 0, &val);
>> + if (error)
>> + return error;
>> +
>> + mutex_lock(&data->mutex);
>> + data->pdata.mdfftmr = val;
>> + disable_irq(data->client->irq);
>> + error = cma3000_set(data, CMA3000_MDFFTMR, val, "mdthr");
>> + enable_irq(data->client->irq);
>> + mutex_unlock(&data->mutex);
>> +
>> + /* If there was error during write, return error */
>> + if (error < 0)
>> + return error;
>> + else
>> + return count;
>> +}
>> +
>> +static ssize_t cma3000_show_attr_ffthr(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + uint8_t mode;
>> +
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> +
>> + mode = cma3000_read(data, CMA3000_FFTHR, "ffthr");
>> + if (mode < 0)
>> + return mode;
>> +
>> + return sprintf(buf, "%d\n", mode);
>> +}
>> +
>> +static ssize_t cma3000_store_attr_ffthr(struct device *dev,
>> + struct device_attribute *attr,
>> + const char *buf, size_t count)
>> +{
>> + struct platform_device *pdev = to_platform_device(dev);
>> + struct cma3000_accl_data *data = platform_get_drvdata(pdev);
>> + unsigned long val;
>> + int error;
>> +
>> + error = strict_strtoul(buf, 0, &val);
>> + if (error)
>> + return error;
>> +
>> + mutex_lock(&data->mutex);
>> + data->pdata.ffthr = val;
>> + disable_irq(data->client->irq);
>> + error = cma3000_set(data, CMA3000_FFTHR, val, "mdthr");
>> + enable_irq(data->client->irq);
>> + mutex_unlock(&data->mutex);
>> +
>> + /* If there was error during write, return error */
>> + if (error < 0)
>> + return error;
>> + else
>> + return count;
>> +}
>> +
>> +static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
>> + cma3000_show_attr_mode, cma3000_store_attr_mode);
>> +
>> +static DEVICE_ATTR(grange, S_IWUSR | S_IRUGO,
>> + cma3000_show_attr_grange, cma3000_store_attr_grange);
>> +
>> +static DEVICE_ATTR(mdthr, S_IWUSR | S_IRUGO,
>> + cma3000_show_attr_mdthr, cma3000_store_attr_mdthr);
>> +
>> +static DEVICE_ATTR(mdfftmr, S_IWUSR | S_IRUGO,
>> + cma3000_show_attr_mdfftmr, cma3000_store_attr_mdfftmr);
>> +
>> +static DEVICE_ATTR(ffthr, S_IWUSR | S_IRUGO,
>> + cma3000_show_attr_ffthr, cma3000_store_attr_ffthr);
>> +
>> +
>> +static struct attribute *cma_attrs[] = {
>> + &dev_attr_mode.attr,
>> + &dev_attr_grange.attr,
>> + &dev_attr_mdthr.attr,
>> + &dev_attr_mdfftmr.attr,
>> + &dev_attr_ffthr.attr,
>> + NULL,
>> +};
>> +
>> +static struct attribute_group cma3000_attr_group = {
>> + .attrs = cma_attrs,
>> +};
>> +
>> +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;
>> +
>> + 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;
>> + data->pdata.g_range = CMARANGE_8G;
>> + }
>> +#ifdef CONFIG_INPUT_CMA3000_I2C
>> + 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");
>> + if (ret < 0)
>> + return -EIO;
>> +
>> + mdelay(CMA3000_SETDELAY);
>> +
>> + return 0;
>> +}
>> +
>> +int cma3000_poweroff(struct cma3000_accl_data *data)
>> +{
>> + int ret;
>> +
>> + ret = cma3000_set(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
>> + mdelay(CMA3000_SETDELAY);
>> +
>> + return ret;
>> +}
>> +
>> +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");
>> + goto err_op2_failed;
>> + }
>> +
>> + memcpy(&(data->pdata), data->client->dev.platform_data,
>> + sizeof(struct cma3000_platform_data));
>> +
>> + ret = cma3000_reset(data);
>> + if (ret)
>> + goto err_op2_failed;
>> +
>> + ret = cma3000_read(data, CMA3000_REVID, "Revid");
>> + if (ret < 0)
>> + goto err_op2_failed;
>> +
>> + pr_info("CMA3000 Acclerometer : Revision %x\n", ret);
>> +
>> + /* Bring it out of default power down state */
>> + ret = cma3000_poweron(data);
>> + if (ret < 0)
>> + goto err_op2_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;
>> +
>> + 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_op2_failed;
>> + }
>> +
>> + data->input_dev->name = "cma3000-acclerometer";
>> +
>> +#ifdef CONFIG_INPUT_CMA3000_I2C
>> + 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);
>> +
>> + ret = input_register_device(data->input_dev);
>> + if (ret) {
>> + dev_err(&data->client->dev,
>> + "Unable to register input device\n");
>> + goto err_op2_failed;
>> + }
>> +
>> + mutex_init(&data->mutex);
>> +
>> + if (data->client->irq) {
>> + 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_op1_failed;
>> + }
>> + }
>> +
>> + ret = sysfs_create_group(&data->client->dev.kobj, &cma3000_attr_group);
>> + if (ret) {
>> + dev_err(&data->client->dev,
>> + "failed to create sysfs entries\n");
>> + goto err_op1_failed;
>> + }
>> + return 0;
>> +
>> +err_op1_failed:
>> + mutex_destroy(&data->mutex);
>> + input_unregister_device(data->input_dev);
>> +err_op2_failed:
>> + if (data != NULL) {
>> + if (data->input_dev != NULL)
>> + input_free_device(data->input_dev);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +int cma3000_exit(struct cma3000_accl_data *data)
>> +{
>> + int ret;
>> +
>> + ret = cma3000_poweroff(data);
>> +
>> + if (data->client->irq)
>> + free_irq(data->client->irq, data);
>> +
>> + mutex_destroy(&data->mutex);
>> + input_unregister_device(data->input_dev);
>> + input_free_device(data->input_dev);
>> + sysfs_remove_group(&data->client->dev.kobj, &cma3000_attr_group);
>> + return ret;
>> +}
>> diff --git a/drivers/input/misc/cma3000_d0x.h
>> b/drivers/input/misc/cma3000_d0x.h
>> new file mode 100644
>> index 0000000..12a8faf
>> --- /dev/null
>> +++ b/drivers/input/misc/cma3000_d0x.h
>> @@ -0,0 +1,46 @@
>> +/*
>> + * cma3000_d0x.h
>> + * 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/i2c.h>
>> +#include <linux/input.h>
>> +
>> +struct cma3000_accl_data {
>> +#ifdef CONFIG_INPUT_CMA3000_I2C
>> + struct i2c_client *client;
>> +#endif
>> + struct input_dev *input_dev;
>> + struct cma3000_platform_data pdata;
>> +
>> + /* mutex for sysfs operations */
>> + struct mutex mutex;
>> + int bit_to_mg;
>> +};
>> +
>> +int cma3000_set(struct cma3000_accl_data *, u8, u8, char *);
>> +int cma3000_read(struct cma3000_accl_data *, u8, char *);
>> +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..41f845c
>> --- /dev/null
>> +++ b/drivers/input/misc/cma3000_d0x_i2c.c
>> @@ -0,0 +1,136 @@
>> +/*
>> + * cma3000_d0x_i2c.c
>> + *
>> + * 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/slab.h>
>> +#include <linux/i2c.h>
>> +#include <linux/i2c/cma3000.h>
>> +#include "cma3000_d0x.h"
>> +
>> +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;
>> +}
>> +
>> +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 int __devinit cma3000_accl_probe(struct i2c_client *client,
>> + const struct i2c_device_id *id)
>> +{
>> + int ret;
>> + struct cma3000_accl_data *data = NULL;
>> +
>> + data = kzalloc(sizeof(*data), GFP_KERNEL);
>> + if (data == NULL) {
>> + ret = -ENOMEM;
>> + goto err_op_failed;
>> + }
>> +
>> + data->client = client;
>> + i2c_set_clientdata(client, data);
>> +
>> + ret = cma3000_init(data);
>> + if (ret)
>> + goto err_op_failed;
>> +
>> + return 0;
>> +
>> +err_op_failed:
>> +
>> + if (data != NULL)
>> + 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_accl", 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@ti.com>");
>> diff --git a/include/linux/i2c/cma3000.h b/include/linux/i2c/cma3000.h
>> new file mode 100644
>> index 0000000..50aa3fc
>> --- /dev/null
>> +++ b/include/linux/i2c/cma3000.h
>> @@ -0,0 +1,60 @@
>> +/*
>> + * cma3000.h
>> + * VTI CMA300_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_I2C_H
>> +#define _LINUX_CMA3000_I2C_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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