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Message-ID: <C9D59C82B94F474B872F2092A87F26141272E78492@dlee07.ent.ti.com>
Date: Wed, 8 Sep 2010 09:24:06 -0500
From: "Murphy, Dan" <dmurphy@...com>
To: "V, Hemanth" <hemanthv@...com>,
"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: RE: [PATCH V3 1/2] input: CMA3000 Accelerometer driver
> -----Original Message-----
> From: linux-input-owner@...r.kernel.org [mailto:linux-input-
> owner@...r.kernel.org] On Behalf Of V, Hemanth
> Sent: Wednesday, September 08, 2010 1:18 AM
> To: linux-input@...r.kernel.org; dmitry.torokhov@...il.com
> Cc: linux-kernel@...r.kernel.org; linux-omap@...r.kernel.org
> Subject: [PATCH V3 1/2] input: CMA3000 Accelerometer driver
>
> From d18a8425a427b97a372bfcd9018e89e93fcad486 Mon Sep 17 00:00:00 2001
> From: Hemanth V <hemanthv@...com>
> Date: Thu, 26 Aug 2010 17:44:48 +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 V3 of patch, which fixes open source review comments
>
> Signed-off-by: Hemanth V <hemanthv@...com>
> Reviewed-by: Jonathan Cameron <jic23@....ac.uk>
> ---
> Documentation/input/cma3000_d0x.txt | 112 ++++++
> drivers/input/misc/Kconfig | 25 ++
> drivers/input/misc/Makefile | 2 +
> drivers/input/misc/cma3000_d0x.c | 632
> ++++++++++++++++++++++++++++++++++
> drivers/input/misc/cma3000_d0x.h | 53 +++
> drivers/input/misc/cma3000_d0x_i2c.c | 144 ++++++++
> include/linux/input/cma3000.h | 60 ++++
> 7 files changed, 1028 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..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@...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 b49e233..8d718a5 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -438,4 +438,29 @@ 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"
> + default n
> + 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
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 19ccca7..9fc5d14 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -17,6 +17,8 @@ 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..143d0b8
> --- /dev/null
> +++ b/drivers/input/misc/cma3000_d0x.c
> @@ -0,0 +1,632 @@
> +/*
> + * cma3000_d0x.c
> + * VTI CMA3000_D0x Accelerometer driver
> + * Supports I2C/SPI interfaces
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@...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/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 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_op1_failed;
> +
> + if (val < CMAMODE_DEFAULT || val > CMAMODE_POFF) {
> + error = -EINVAL;
> + goto err_op1_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_op3_failed;
> +
> + /* Settling time delay required after mode change */
> + msleep(CMA3000_SETDELAY);
> +
> +err_op3_failed:
> + enable_irq(data->client->irq);
> +err_op2_failed:
> + mutex_unlock(&data->mutex);
> +err_op1_failed:
> + return error ? error : count;
> +}
> +
> +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_op1_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;
Can you explain why you store these locally and not just pass in the pdata values directly to the calls below? This seems to be unneeded code.
> +
> + disable_irq(data->client->irq);
> + error = CMA3000_SET(data, CMA3000_CTRL, ctrl, "ctrl");
> + if (error < 0)
> + goto err_op3_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);
> +
> +err_op3_failed:
> + enable_irq(data->client->irq);
> +err_op2_failed:
> + mutex_unlock(&data->mutex);
> +err_op1_failed:
> + return error ? error : count;
> +}
> +
> +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)
> + goto err_op_failed;
> +
I am a little concerned that you do not check the value passed in here.
Is there not a range of values you will accept and not accept?
> + 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);
> +
> +err_op_failed:
> + /* If error value non zero, return error */
> + return error ? error : 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)
> + goto err_op_failed;
> +
I am a little concerned that you do not check the value passed in here.
Is there not a range of values you will accept and not accept?
> + 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);
> +
> +err_op_failed:
> + /* If error value non zero, return error */
> + return error ? error : 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)
> + goto err_op_failed;
> +
Repeating myself here but.
I am a little concerned that you do not check the value passed in here.
Is there not a range of values you will accept and not accept?
> + 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);
> +
> +err_op_failed:
> + /* If error value non zero, return error */
> + return error ? error : 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)
You return here but you still have an open report that is not completed from the free fall. Is that an issue?
And shouldn't an interrupt check be done earlier in this handler?
> + 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);
Why do you use mdelay instead of msleep? Do you really need to block during this time? Is this settling time defined in the data sheet? And why is this 10ms and not 30ms as defined in other delay use cases?
> +
> + 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) {
When would this case be exercised? In the set mode interface there is a range check for mode so technically the mode cannot be set out of range.
> + 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;
> + }
> +#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");
> + if (ret < 0)
> + return -EIO;
> +
> + mdelay(CMA3000_SETDELAY);
Why do you use mdelay instead of msleep? Do you really need to block during this time?
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(cma3000_poweron);
Why do you export this call and expose it in the header file?
> +
> +int cma3000_poweroff(struct cma3000_accl_data *data)
> +{
> + int ret;
> +
> + ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
> + mdelay(CMA3000_SETDELAY);
Why do you use mdelay instead of msleep? Do you really need to block during this time?
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(cma3000_poweroff);
Why do you export this call and expose it in the header file?
> +
> +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_op1_failed;
> + }
> +
> + /* if no IRQ return error */
> + if (data->client->irq == 0) {
> + ret = -ENODEV;
> + 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 Acclerometer : 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;
> +
> + 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-acclerometer";
> +
> +#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 = 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_op2_failed;
> + }
> +
> + ret = input_register_device(data->input_dev);
> + if (ret) {
> + dev_err(&data->client->dev,
> + "Unable to register input device\n");
> + goto err_op2_failed;
Shouldn't you have and err_op3 here to remove the created group on failure?
> + }
> +
> + return 0;
> +
These error cases do not seem to be complete.
Some of the missing cases are the removal of the sysfs group, destroying of the request_thread_irq and freeing of the input device before registering it. I hope these are not handled in a different API this makes the code hard to verify and validate proper error handling.
> +err_op2_failed:
> + mutex_destroy(&data->mutex);
> +err_op1_failed:
> + if (data->input_dev != NULL)
> + input_free_device(data->input_dev);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL(cma3000_init);
Why do you export this call and expose it in the header file?
> +
> +int cma3000_exit(struct cma3000_accl_data *data)
> +{
> + int ret;
> +
> + ret = cma3000_poweroff(data);
> +
> + if (data->client->irq)
> + free_irq(data->client->irq, data);
> +
> + sysfs_remove_group(&data->client->dev.kobj, &cma3000_attr_group);
> + mutex_destroy(&data->mutex);
> + input_unregister_device(data->input_dev);
> + return ret;
> +}
> +EXPORT_SYMBOL(cma3000_exit);
Why do you export this call and expose it in the header file?
> +
> +MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Hemanth V <hemanthv@...com>");
> 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@...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;
> +
> +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..c605465
> --- /dev/null
> +++ b/drivers/input/misc/cma3000_d0x_i2c.c
> @@ -0,0 +1,144 @@
> +/*
> + * cma3000_d0x_i2c.c
> + *
> + * Implements I2C interface for VTI CMA300_D0x Accelerometer driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@...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/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;
> +
> + 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:
> +
> + 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_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,
Nitpicking. Spacing is off.
> +#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@...com>");
> diff --git a/include/linux/input/cma3000.h b/include/linux/input/cma3000.h
> new file mode 100644
> index 0000000..a3d9fc7
> --- /dev/null
> +++ b/include/linux/input/cma3000.h
> @@ -0,0 +1,60 @@
> +/*
> + * cma3000.h
> + * VTI CMA300_Dxx Accelerometer driver
> + *
> + * Copyright (C) 2010 Texas Instruments
> + * Author: Hemanth V <hemanthv@...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;
> + uint32_t irqflags;
> +};
> +
> +#endif
> --
> 1.5.4.3
>
>
>
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