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Date: Fri, 27 Jul 2012 18:42:52 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Yann Cantin <yann.cantin@...oste.net>
Cc: linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC ebeam PATCH 3/3] input: misc: New USB eBeam input driver.
Hi Yann,
On Sat, Jul 28, 2012 at 02:02:34AM +0200, Yann Cantin wrote:
>
> Signed-off-by: Yann Cantin <yann.cantin@...oste.net>
> ---
> drivers/input/misc/Kconfig | 21 +
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/ebeam.c | 895 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 917 insertions(+)
> create mode 100644 drivers/input/misc/ebeam.c
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 7faf4a7..0e798cb 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -73,6 +73,27 @@ config INPUT_BMA150
> To compile this driver as a module, choose M here: the
> module will be called bma150.
>
> +config INPUT_EBEAM_USB
> + tristate "USB eBeam driver"
> + depends on USB_ARCH_HAS_HCD
> + select USB
> + help
> + Say Y here if you have a USB eBeam pointing device and want to
> + use it without any proprietary user space tools.
> +
> + Have a look at <http://sourceforge.net/projects/ebeam/> for
> + a usage description and the required user-space tools.
> +
> + Currently, only the Classic Projection model is supported.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ebeam.
> +
> +config INPUT_EBEAM_USB_CLASSIC
> + bool "eBeam Classic Projection support"
> + depends on INPUT_EBEAM_USB
> + default y
Will there be support for other eBean devices (are there any)? If there
will how soon? How different are they? If not the we probably do not
need this INPUT_EBEAM_USB_CLASSIC selector.
> +
> config INPUT_PCSPKR
> tristate "PC Speaker support"
> depends on PCSPKR_PLATFORM
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index f55cdf4..4b5e4a9 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -23,6 +23,7 @@ obj-$(CONFIG_INPUT_CMA3000_I2C) += cma3000_d0x_i2c.o
> obj-$(CONFIG_INPUT_COBALT_BTNS) += cobalt_btns.o
> obj-$(CONFIG_INPUT_DA9052_ONKEY) += da9052_onkey.o
> obj-$(CONFIG_INPUT_DM355EVM) += dm355evm_keys.o
> +obj-$(CONFIG_INPUT_EBEAM_USB) += ebeam.o
> obj-$(CONFIG_INPUT_GP2A) += gp2ap002a00f.o
> obj-$(CONFIG_INPUT_GPIO_TILT_POLLED) += gpio_tilt_polled.o
> obj-$(CONFIG_HP_SDC_RTC) += hp_sdc_rtc.o
> diff --git a/drivers/input/misc/ebeam.c b/drivers/input/misc/ebeam.c
> new file mode 100644
> index 0000000..a18615a
> --- /dev/null
> +++ b/drivers/input/misc/ebeam.c
> @@ -0,0 +1,895 @@
> +/******************************************************************************
> + *
> + * eBeam driver
> + *
> + * Copyright (C) 2012 Yann Cantin (yann.cantin@...oste.net)
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of the
> + * License, or (at your option) any later version.
> + *
> + * based on
> + *
> + * usbtouchscreen.c by Daniel Ritz <daniel.ritz@....ch>
> + * aiptek.c (sysfs/settings) by Chris Atenasio <chris@...d.net>
> + * Bryan W. Headley <bwheadley@...thlink.net>
> + *
> + *****************************************************************************/
> +
> +#define DEBUG
I do not think leaving DEBUG on is good idea for production code.
> +
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/input.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/usb.h>
> +#include <linux/usb/input.h>
> +#include <linux/hid.h>
> +
> +#define DRIVER_VERSION "v0.5"
> +#define DRIVER_AUTHOR "Yann Cantin <yann.cantin@...oste.net>"
> +#define DRIVER_DESC "USB eBeam Driver"
> +
> +#define USB_VENDOR_ID_EFI 0x2650 /* Electronics For Imaging, Inc */
> +#define USB_DEVICE_ID_EFI_CLASSIC 0x1311 /* Classic projection "La banane" */
> +
> +#define EBEAM_BTN_TIP 0x1 /* tip */
> +#define EBEAM_BTN_LIT 0x2 /* little */
> +#define EBEAM_BTN_BIG 0x4 /* big */
> +
> +/* until KConfig */
> +#define CONFIG_INPUT_EBEAM_USB_CLASSIC
Huh?
> +
> +/* device specifc data/functions */
> +struct ebeam_device;
> +struct ebeam_device_info {
> + int min_X;
> + int max_X;
> + int min_Y;
> + int max_Y;
> +
> + /*
> + * TODO : Check if it's really necessary, waiting for other device info.
> + * Always service the USB devices irq not just when the input device is
> + * open. This is useful when devices have a watchdog which prevents us
> + * from periodically polling the device. Leave this unset unless your
> + * ebeam device requires it, as it does consume more of the USB
> + * bandwidth.
> + */
> + bool irq_always;
Does you device need this?
> +
> + int rept_size;
> +
> + /* optional, generic exist */
> + void (*process_pkt) (struct ebeam_device *ebeam,
> + unsigned char *pkt,
> + int len);
> +
> + /* mandatory, model-specific */
> + int (*read_data) (struct ebeam_device *ebeam,
> + unsigned char *pkt);
> + void (*setup_input) (struct ebeam_device *ebeam,
> + struct input_dev *input_dev);
> + void (*report_input) (struct ebeam_device *ebeam);
> +
> + /* optional, model-specific */
> + int (*alloc) (struct ebeam_device *ebeam);
> + int (*init) (struct ebeam_device *ebeam);
> + void (*exit) (struct ebeam_device *ebeam);
Again, do you expect to see multitude of sufficiently different
devices or are they going to follow roughly the same protocol?
Thanks.
--
Dmitry
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