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Message-ID: <alpine.LRH.2.00.1208031424250.15211@twin.jikos.cz>
Date: Fri, 3 Aug 2012 14:25:15 +0200 (CEST)
From: Jiri Kosina <jkosina@...e.cz>
To: Yann Cantin <yann.cantin@...oste.net>
Cc: linux-input@...r.kernel.org, linux-usb@...r.kernel.org,
gregkh@...uxfoundation.org,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-kernel@...r.kernel.org
Subject: Re: [RFC ebeam PATCH v2 3/3] input: misc: New USB eBeam input
driver.
On Thu, 2 Aug 2012, Yann Cantin wrote:
> Signed-off-by: Yann Cantin <yann.cantin@...oste.net>
> ---
> drivers/input/misc/Kconfig | 16 +
> drivers/input/misc/Makefile | 1 +
> drivers/input/misc/ebeam.c | 760 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 777 insertions(+)
> create mode 100644 drivers/input/misc/ebeam.c
>
> diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
> index 7c0f1ec..1e575e4 100644
> --- a/drivers/input/misc/Kconfig
> +++ b/drivers/input/misc/Kconfig
> @@ -83,6 +83,22 @@ 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_PCSPKR
> tristate "PC Speaker support"
> depends on PCSPKR_PLATFORM
> diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
> index 83fe6f5..2aa9813 100644
> --- a/drivers/input/misc/Makefile
> +++ b/drivers/input/misc/Makefile
> @@ -24,6 +24,7 @@ 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..9c698a3
> --- /dev/null
> +++ b/drivers/input/misc/ebeam.c
> @@ -0,0 +1,760 @@
> +/******************************************************************************
> + *
> + * 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>
> + *
> + *****************************************************************************/
> +
> +#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>
As this driver is not a HID bus driver, why do you need this include?
> +
> +#define DRIVER_VERSION "v0.7"
I don't think we need to be tracking driver versions for newly submitted
drivers, git is much better at tracking changes.
> +#define DRIVER_AUTHOR "Yann Cantin <yann.cantin@...oste.net>"
> +#define DRIVER_DESC "USB eBeam Driver"
> +
> +/* Common values for eBeam devices */
> +#define REPT_SIZE 8 /* packet size */
> +#define MIN_X 0 /* raw coordinates ranges */
> +#define MAX_X 0xFFFF
> +#define MIN_Y 0
> +#define MAX_Y 0xFFFF
> +
> +
> +#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 */
> +
> +/* ebeam settings */
> +struct ebeam_settings {
> + int min_x;
> + int max_x;
> + int min_y;
> + int max_y;
> +
> + /* H matrix */
> + s64 h1;
> + s64 h2;
> + s64 h3;
> + s64 h4;
> + s64 h5;
> + s64 h6;
> + s64 h7;
> + s64 h8;
> + s64 h9;
> +};
> +
> +/* ebeam device */
> +struct ebeam_device {
> + unsigned char *data;
> + dma_addr_t data_dma;
> + unsigned char *buffer;
> + int buf_len;
> + struct urb *irq;
> + struct usb_interface *interface;
> + struct input_dev *input;
> + char name[128];
> + char phys[64];
> + void *priv;
> +
> + struct ebeam_settings cursetting; /* device's current settings */
> + struct ebeam_settings newsetting; /* ... and new ones */
> +
> + bool calibrated; /* false : send raw */
> + /* true : send computed */
> +
> + u16 X, Y; /* raw coordinates */
> + int x, y; /* computed coordinates */
X,x being different fields seems confusing to me. How about, let's say, x,
raw_x?
> + int btn_map; /* internal buttons map */
> +};
> +
> +
> +/* device types */
> +enum {
> + DEVTYPE_CLASSIC,
> +};
> +
> +static const struct usb_device_id ebeam_devices[] = {
> + {USB_DEVICE(USB_VENDOR_ID_EFI, USB_DEVICE_ID_EFI_CLASSIC),
> + .driver_info = DEVTYPE_CLASSIC},
> + {}
> +};
> +
> +static void ebeam_init_settings(struct ebeam_device *ebeam)
> +{
> + ebeam->calibrated = false;
> +
> + /* Init (x,y) min/max to raw ones */
> + ebeam->cursetting.min_x = ebeam->newsetting.min_x = MIN_X;
> + ebeam->cursetting.max_x = ebeam->newsetting.max_x = MAX_X;
> + ebeam->cursetting.min_y = ebeam->newsetting.min_y = MIN_Y;
> + ebeam->cursetting.max_y = ebeam->newsetting.max_y = MAX_Y;
> +
> + /* Safe values for the H matrix (Identity) */
> + ebeam->cursetting.h1 = ebeam->newsetting.h1 = 1;
> + ebeam->cursetting.h2 = ebeam->newsetting.h2 = 0;
> + ebeam->cursetting.h3 = ebeam->newsetting.h3 = 0;
> +
> + ebeam->cursetting.h4 = ebeam->newsetting.h4 = 0;
> + ebeam->cursetting.h5 = ebeam->newsetting.h5 = 1;
> + ebeam->cursetting.h6 = ebeam->newsetting.h6 = 0;
> +
> + ebeam->cursetting.h7 = ebeam->newsetting.h7 = 0;
> + ebeam->cursetting.h8 = ebeam->newsetting.h8 = 0;
> + ebeam->cursetting.h9 = ebeam->newsetting.h9 = 1;
> +}
> +
> +static void ebeam_setup_input(struct ebeam_device *ebeam,
> + struct input_dev *input_dev)
> +{
> + unsigned long flags;
> +
> + /* Take event lock while modifying parameters */
> + spin_lock_irqsave(&input_dev->event_lock, flags);
> +
> + /* Properties */
> + set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
> +
> + /* Events generated */
> + set_bit(EV_KEY, input_dev->evbit);
> + set_bit(EV_ABS, input_dev->evbit);
> +
> + /* Keys */
> + set_bit(BTN_LEFT, input_dev->keybit);
> + set_bit(BTN_MIDDLE, input_dev->keybit);
> + set_bit(BTN_RIGHT, input_dev->keybit);
> +
> + /* Axis */
> + if (!ebeam->calibrated) {
> + ebeam->cursetting.min_x = MIN_X;
> + ebeam->cursetting.max_x = MAX_X;
> + ebeam->cursetting.min_y = MIN_Y;
> + ebeam->cursetting.max_y = MAX_Y;
> + }
> +
> + input_set_abs_params(input_dev, ABS_X,
> + ebeam->cursetting.min_x, ebeam->cursetting.max_x,
> + 0, 0);
> + input_set_abs_params(input_dev, ABS_Y,
> + ebeam->cursetting.min_y, ebeam->cursetting.max_y,
> + 0, 0);
> +
> + spin_unlock_irqrestore(&input_dev->event_lock, flags);
> +}
> +
> +/*******************************************************************************
> + * sysfs part
> + */
> +
> +/*
> + * screen min/max and H matrix coefs
> + * _get return *current* value
> + * _set set new value
> + */
> +#define DEVICE_MINMAX_ATTR(MM) \
> +static ssize_t ebeam_##MM##_get(struct device *dev, \
> + struct device_attribute *attr, \
> + char *buf) \
> +{ \
> + struct ebeam_device *ebeam = dev_get_drvdata(dev); \
> + \
> + return snprintf(buf, PAGE_SIZE, "%d\n", ebeam->cursetting.MM); \
> +} \
> +static ssize_t ebeam_##MM##_set(struct device *dev, \
> + struct device_attribute *attr, \
> + const char *buf, \
> + size_t count) \
> +{ \
> + struct ebeam_device *ebeam = dev_get_drvdata(dev); \
> + int err, MM; \
> + \
> + err = kstrtoint(buf, 10, &MM); \
> + if (err) \
> + return err; \
> + \
> + ebeam->newsetting.MM = MM; \
> + return count; \
> +} \
> +static DEVICE_ATTR(MM, S_IRUGO | S_IWUGO, \
> + ebeam_##MM##_get, \
> + ebeam_##MM##_set)
> +
> +DEVICE_MINMAX_ATTR(min_x);
> +DEVICE_MINMAX_ATTR(max_x);
> +DEVICE_MINMAX_ATTR(min_y);
> +DEVICE_MINMAX_ATTR(max_y);
> +
> +#define DEVICE_H_ATTR(SET_ID) \
> +static ssize_t ebeam_h##SET_ID##_get(struct device *dev, \
> + struct device_attribute *attr, \
> + char *buf) \
> +{ \
> + struct ebeam_device *ebeam = dev_get_drvdata(dev); \
> + \
> + return snprintf(buf, PAGE_SIZE, "%lld\n", ebeam->cursetting.h##SET_ID);\
> +} \
> +static ssize_t ebeam_h##SET_ID##_set(struct device *dev, \
> + struct device_attribute *attr, \
> + const char *buf, \
> + size_t count) \
> +{ \
> + struct ebeam_device *ebeam = dev_get_drvdata(dev); \
> + int err; \
> + u64 h; \
> + \
> + err = kstrtoll(buf, 10, &h); \
> + if (err) \
> + return err; \
> + \
> + ebeam->newsetting.h##SET_ID = h; \
> + return count; \
> +} \
> +static DEVICE_ATTR(h##SET_ID, S_IRUGO | S_IWUGO, \
> + ebeam_h##SET_ID##_get, \
> + ebeam_h##SET_ID##_set)
> +
> +DEVICE_H_ATTR(1);
> +DEVICE_H_ATTR(2);
> +DEVICE_H_ATTR(3);
> +DEVICE_H_ATTR(4);
> +DEVICE_H_ATTR(5);
> +DEVICE_H_ATTR(6);
> +DEVICE_H_ATTR(7);
> +DEVICE_H_ATTR(8);
> +DEVICE_H_ATTR(9);
You are adding a number of sysfs files. If they are really necessary,
you'll probably need to document those in Documentation/ABI.
> +
> +/*
> + * sysfs calibrated
> + * Once H matrix coefs are set, writing 1 to this file triggers
> + * coordinates mapping.
> + * Anything else reset the device to un-calibrated mode,
> + * storing cursetting in newsetting.
> +*/
> +static ssize_t ebeam_calibrated_get(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct ebeam_device *ebeam = dev_get_drvdata(dev);
> +
> + return snprintf(buf, PAGE_SIZE, "%d\n", ebeam->calibrated);
> +}
> +
> +static ssize_t ebeam_calibrated_set(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf,
> + size_t count)
> +{
> + struct ebeam_device *ebeam = dev_get_drvdata(dev);
> + int err, c;
> +
> + err = kstrtoint(buf, 10, &c);
> + if (err)
> + return err;
> +
> + if (c == 1) {
> + memcpy(&ebeam->cursetting, &ebeam->newsetting,
> + sizeof(struct ebeam_settings));
> + ebeam->calibrated = true;
> + ebeam_setup_input(ebeam, ebeam->input);
> + } else {
> + memcpy(&ebeam->newsetting, &ebeam->cursetting,
> + sizeof(struct ebeam_settings));
> + ebeam->calibrated = false;
> + ebeam_setup_input(ebeam, ebeam->input);
> + }
> +
> + return count;
> +}
> +
> +static DEVICE_ATTR(calibrated, S_IRUGO | S_IWUGO,
> + ebeam_calibrated_get, ebeam_calibrated_set);
> +
> +static struct attribute *ebeam_attrs[] = {
> + &dev_attr_min_x.attr,
> + &dev_attr_min_y.attr,
> + &dev_attr_max_x.attr,
> + &dev_attr_max_y.attr,
> + &dev_attr_h1.attr,
> + &dev_attr_h2.attr,
> + &dev_attr_h3.attr,
> + &dev_attr_h4.attr,
> + &dev_attr_h5.attr,
> + &dev_attr_h6.attr,
> + &dev_attr_h7.attr,
> + &dev_attr_h8.attr,
> + &dev_attr_h9.attr,
> + &dev_attr_calibrated.attr,
> + NULL
> +};
> +
> +static const struct attribute_group ebeam_attr_group = {
> + .attrs = ebeam_attrs,
> +};
> +
> +/* IRQ */
> +static int ebeam_read_data(struct ebeam_device *ebeam, unsigned char *pkt)
> +{
> +
> +/*
> + * Packet description : 8 bytes
> + *
> + * nop packet : FF FF FF FF FF FF FF FF
> + *
> + * pkt[0] : Sensors
> + * bit 1 : ultrasound signal (guessed)
> + * bit 2 : IR signal (tested with a remote...) ;
> + * readings OK : 0x03 (anything else is a show-stopper)
> + *
> + * pkt[1] : X low
> + * pkt[2] : X high
> + *
> + * pkt[3] : Y low
> + * pkt[4] : Y high
> + *
> + * pkt[5] : fiability ?
> + * often 0xC0
> + * > 0x80 : OK
> + *
> + * pkt[6] :
> + * buttons state (low 4 bits)
> + * 0x1 = no buttons
> + * bit 0 : tip (WARNING inversed : 0=pressed)
> + * bit 1 : ? (always 0 during tests)
> + * bit 2 : little (1=pressed)
> + * bit 3 : big (1=pressed)
> + *
> + * pointer ID : (hight 4 bits)
> + * Tested : 0x6=wand ;
> + * Guessed : 0x1=red ; 0x2=blue ; 0x3=green ; 0x4=black ;
> + * 0x5=eraser
> + * bit 4 : pointer ID
> + * bit 5 : pointer ID
> + * bit 6 : pointer ID
> + * bit 7 : pointer ID
> + *
> + *
> + * pkt[7] : fiability ?
> + * often 0xFF
> + *
> + */
> +
> + /* Filtering bad/nop packet */
> + if (pkt[0] != 0x03)
> + return 0;
> +
> + ebeam->X = (pkt[2] << 8) | pkt[1];
> + ebeam->Y = (pkt[4] << 8) | pkt[3];
> +
> + ebeam->btn_map = (!(pkt[6] & 0x1)) |
> + ((pkt[6] & 0x4) >> 1) |
> + ((pkt[6] & 0x8) >> 1);
> +
> + return 1;
> +}
> +
> +/* IRQ */
> +static void ebeam_report_input(struct ebeam_device *ebeam)
> +{
> + input_report_key(ebeam->input, BTN_LEFT,
> + (ebeam->btn_map & EBEAM_BTN_TIP));
> + input_report_key(ebeam->input, BTN_MIDDLE,
> + (ebeam->btn_map & EBEAM_BTN_LIT));
> + input_report_key(ebeam->input, BTN_RIGHT,
> + (ebeam->btn_map & EBEAM_BTN_BIG));
> +
> + input_report_abs(ebeam->input, ABS_X, ebeam->x);
> + input_report_abs(ebeam->input, ABS_Y, ebeam->y);
> +
> + input_sync(ebeam->input);
> +}
> +
> +/*
> + * IRQ
> + * compute screen coordinates from raw
> + * Overflow and negative values are user space's problem
> + */
> +static bool ebeam_calculate_xy(struct ebeam_device *ebeam)
> +{
> + /* TODO : check if u64 division is available on all plateform */
> +
> + s64 scale;
> +
> + if (!ebeam->calibrated) {
> + ebeam->x = ebeam->X;
> + ebeam->y = ebeam->Y;
> + } else {
> + scale = ebeam->cursetting.h7 * ebeam->X +
> + ebeam->cursetting.h8 * ebeam->Y +
> + ebeam->cursetting.h9;
> +
> + /* Who want a division by zero in kernel ? */
> + if (scale == 0) {
> + dev_err(&(ebeam->interface)->dev,
> + "%s - Division by zero, wrong calibration.\n",
> + __func__);
> + dev_err(&(ebeam->interface)->dev,
> + "%s - Resetting to un-calibrated mode.\n",
> + __func__);
> + ebeam->calibrated = false;
> + return 0;
> + }
> +
> + /*
> + * We *must* round the result, but not with (int) (v1/v2 + 0.5)
> + *
> + * (int) (v1/v2 + 0.5) <=> (int) ( (2*v1 + v2)/(2*v2) )
> + */
> + ebeam->x = (int) ((((ebeam->cursetting.h1 * ebeam->X +
> + ebeam->cursetting.h2 * ebeam->Y +
> + ebeam->cursetting.h3) << 1) + scale) /
> + (scale << 1));
> + ebeam->y = (int) ((((ebeam->cursetting.h4 * ebeam->X +
> + ebeam->cursetting.h5 * ebeam->Y +
> + ebeam->cursetting.h6) << 1) + scale) /
> + (scale << 1));
> + }
> +
> + return 1;
> +}
> +
> +/* IRQ */
> +static void ebeam_process_pkt(struct ebeam_device *ebeam,
> + unsigned char *pkt, int len)
> +{
> + if (!ebeam_read_data(ebeam, pkt))
> + return;
> +
> + if (!ebeam_calculate_xy(ebeam))
> + return;
> +
> + ebeam_report_input(ebeam);
> +}
> +
> +/* IRQ
> + * handler */
> +static void ebeam_irq(struct urb *urb)
> +{
> + struct ebeam_device *ebeam = urb->context;
> + struct device *dev = &ebeam->interface->dev;
> + int retval;
> +
> + switch (urb->status) {
> + case 0:
> + /* success */
> + break;
> + case -ETIME:
> + /* this urb is timing out */
> + dev_dbg(dev,
> + "%s - urb timed out - was the device unplugged?\n",
> + __func__);
> + return;
> + case -ECONNRESET:
> + case -ENOENT:
> + case -ESHUTDOWN:
> + case -EPIPE:
> + /* this urb is terminated, clean up */
> + dev_dbg(dev, "%s - urb shutting down with status: %d\n",
> + __func__, urb->status);
> + return;
> + default:
> + dev_dbg(dev, "%s - nonzero urb status received: %d\n",
> + __func__, urb->status);
> + goto exit;
> + }
> +
> + ebeam_process_pkt(ebeam, ebeam->data, urb->actual_length);
> +
> +exit:
> + usb_mark_last_busy(interface_to_usbdev(ebeam->interface));
> + retval = usb_submit_urb(urb, GFP_ATOMIC);
> + if (retval)
> + dev_err(dev, "%s - usb_submit_urb failed with result: %d\n",
> + __func__, retval);
> +}
> +
> +static int ebeam_open(struct input_dev *input)
> +{
> + struct ebeam_device *ebeam = input_get_drvdata(input);
> + int r;
> +
> + ebeam->irq->dev = interface_to_usbdev(ebeam->interface);
> +
> + r = usb_autopm_get_interface(ebeam->interface) ? -EIO : 0;
> + if (r < 0)
> + goto out;
> +
> + if (usb_submit_urb(ebeam->irq, GFP_KERNEL)) {
> + r = -EIO;
> + goto out_put;
> + }
> +
> + ebeam->interface->needs_remote_wakeup = 1;
> +out_put:
> + usb_autopm_put_interface(ebeam->interface);
> +out:
> + return r;
> +}
> +
> +static void ebeam_close(struct input_dev *input)
> +{
> + struct ebeam_device *ebeam = input_get_drvdata(input);
> + int r;
> +
> + usb_kill_urb(ebeam->irq);
> +
> + r = usb_autopm_get_interface(ebeam->interface);
> + ebeam->interface->needs_remote_wakeup = 0;
> +
> + if (!r)
> + usb_autopm_put_interface(ebeam->interface);
> +}
> +
> +static int ebeam_suspend(struct usb_interface *intf, pm_message_t message)
> +{
> + struct ebeam_device *ebeam = usb_get_intfdata(intf);
> +
> + usb_kill_urb(ebeam->irq);
> +
> + return 0;
> +}
> +
> +static int ebeam_resume(struct usb_interface *intf)
> +{
> + struct ebeam_device *ebeam = usb_get_intfdata(intf);
> + struct input_dev *input = ebeam->input;
> + int result = 0;
> +
> + mutex_lock(&input->mutex);
> + if (input->users)
> + result = usb_submit_urb(ebeam->irq, GFP_NOIO);
> + mutex_unlock(&input->mutex);
> +
> + return result;
> +}
> +
> +static int ebeam_reset_resume(struct usb_interface *intf)
> +{
> + struct ebeam_device *ebeam = usb_get_intfdata(intf);
> + struct input_dev *input = ebeam->input;
> + int err = 0;
> +
> + /* restart IO if needed */
> + mutex_lock(&input->mutex);
> + if (input->users)
> + err = usb_submit_urb(ebeam->irq, GFP_NOIO);
> + mutex_unlock(&input->mutex);
> +
> + return err;
> +}
> +
> +static void ebeam_free_buffers(struct usb_device *udev,
> + struct ebeam_device *ebeam)
> +{
> + usb_free_coherent(udev, REPT_SIZE,
> + ebeam->data, ebeam->data_dma);
> + kfree(ebeam->buffer);
> +}
> +
> +static struct usb_endpoint_descriptor *
> +ebeam_get_input_endpoint(struct usb_host_interface *interface)
> +{
> + int i;
> +
> + for (i = 0; i < interface->desc.bNumEndpoints; i++)
> + if (usb_endpoint_dir_in(&interface->endpoint[i].desc))
> + return &interface->endpoint[i].desc;
> +
> + return NULL;
> +}
> +
> +static int ebeam_probe(struct usb_interface *intf,
> + const struct usb_device_id *id)
> +{
> + struct ebeam_device *ebeam;
> + struct input_dev *input_dev;
> + struct usb_endpoint_descriptor *endpoint;
> + struct usb_device *udev = interface_to_usbdev(intf);
> + int err = -ENOMEM;
> +
> + endpoint = ebeam_get_input_endpoint(intf->cur_altsetting);
> + if (!endpoint)
> + return -ENXIO;
> +
> + ebeam = kzalloc(sizeof(struct ebeam_device), GFP_KERNEL);
> + input_dev = input_allocate_device();
> + if (!ebeam || !input_dev)
> + goto out_free;
> +
> + ebeam_init_settings(ebeam);
> +
> + ebeam->data = usb_alloc_coherent(udev, REPT_SIZE,
> + GFP_KERNEL, &ebeam->data_dma);
> + if (!ebeam->data)
> + goto out_free;
> +
> + ebeam->irq = usb_alloc_urb(0, GFP_KERNEL);
> + if (!ebeam->irq) {
> + dev_dbg(&intf->dev,
> + "%s - usb_alloc_urb failed: ebeam->irq\n", __func__);
> + goto out_free_buffers;
> + }
> +
> + ebeam->interface = intf;
> + ebeam->input = input_dev;
> +
> + /* setup name */
> + snprintf(ebeam->name, sizeof(ebeam->name),
> + "USB eBeam %04x:%04x",
> + le16_to_cpu(udev->descriptor.idVendor),
> + le16_to_cpu(udev->descriptor.idProduct));
> +
> + if (udev->manufacturer || udev->product) {
> + strlcat(ebeam->name,
> + " (",
> + sizeof(ebeam->name));
> +
> + if (udev->manufacturer)
> + strlcat(ebeam->name,
> + udev->manufacturer,
> + sizeof(ebeam->name));
> +
> + if (udev->product) {
> + if (udev->manufacturer)
> + strlcat(ebeam->name,
> + " ",
> + sizeof(ebeam->name));
> + strlcat(ebeam->name,
> + udev->product,
> + sizeof(ebeam->name));
> + }
> +
> + strlcat(ebeam->name, ")", sizeof(ebeam->name));
> + }
I'd suggest checking the length, making sure that you don't overflow the
->name buffer.
> +
> + /* usb tree */
> + usb_make_path(udev, ebeam->phys, sizeof(ebeam->phys));
> + strlcat(ebeam->phys, "/input0", sizeof(ebeam->phys));
> +
> + /* input setup */
> + input_dev->name = ebeam->name;
> + input_dev->phys = ebeam->phys;
> + usb_to_input_id(udev, &input_dev->id);
> + input_dev->dev.parent = &intf->dev;
> +
> + input_set_drvdata(input_dev, ebeam);
> +
> + input_dev->open = ebeam_open;
> + input_dev->close = ebeam_close;
> +
> + /* usb urb setup */
> + if (usb_endpoint_type(endpoint) == USB_ENDPOINT_XFER_INT)
> + usb_fill_int_urb(ebeam->irq, udev,
> + usb_rcvintpipe(udev, endpoint->bEndpointAddress),
> + ebeam->data, REPT_SIZE,
> + ebeam_irq, ebeam, endpoint->bInterval);
> + else
> + usb_fill_bulk_urb(ebeam->irq, udev,
> + usb_rcvbulkpipe(udev, endpoint->bEndpointAddress),
> + ebeam->data, REPT_SIZE,
> + ebeam_irq, ebeam);
> +
> + ebeam->irq->dev = udev;
> + ebeam->irq->transfer_dma = ebeam->data_dma;
> + ebeam->irq->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
> +
> + /* input final setup */
> + err = input_register_device(ebeam->input);
> + if (err) {
> + dev_dbg(&intf->dev,
> + "%s - input_register_device failed, err: %d\n",
> + __func__, err);
> + goto out_free_urb;
> + }
> +
> + ebeam_setup_input(ebeam, input_dev);
> +
> + /* usb final setup */
> + usb_set_intfdata(intf, ebeam);
> +
> + /* sysfs setup */
> + err = sysfs_create_group(&intf->dev.kobj, &ebeam_attr_group);
> + if (err) {
> + dev_dbg(&intf->dev,
> + "%s - cannot create sysfs group, err: %d\n",
> + __func__, err);
> + goto out_unregister_input;
> + }
> +
> + return 0;
> +
> +out_unregister_input:
> + input_unregister_device(input_dev);
> + input_dev = NULL;
> +out_free_urb:
> + usb_free_urb(ebeam->irq);
> +out_free_buffers:
> + ebeam_free_buffers(udev, ebeam);
> +out_free:
> + input_free_device(input_dev);
> + kfree(ebeam);
> + return err;
> +}
> +
> +static void ebeam_disconnect(struct usb_interface *intf)
> +{
> + struct ebeam_device *ebeam = usb_get_intfdata(intf);
> +
> + if (!ebeam)
> + return;
> +
> + dev_dbg(&intf->dev,
> + "%s - ebeam is initialized, cleaning up\n", __func__);
> +
> + usb_set_intfdata(intf, NULL);
> + /* this will stop IO via close */
> + input_unregister_device(ebeam->input);
> + sysfs_remove_group(&intf->dev.kobj, &ebeam_attr_group);
> + usb_free_urb(ebeam->irq);
> + ebeam_free_buffers(interface_to_usbdev(intf), ebeam);
> + kfree(ebeam);
> +}
> +
> +MODULE_DEVICE_TABLE(usb, ebeam_devices);
> +
> +static struct usb_driver ebeam_driver = {
> + .name = "ebeam",
> + .probe = ebeam_probe,
> + .disconnect = ebeam_disconnect,
> + .suspend = ebeam_suspend,
> + .resume = ebeam_resume,
> + .reset_resume = ebeam_reset_resume,
> + .id_table = ebeam_devices,
> + .supports_autosuspend = 1,
> +};
> +
> +module_usb_driver(ebeam_driver);
> +
> +MODULE_AUTHOR(DRIVER_AUTHOR);
> +MODULE_DESCRIPTION(DRIVER_DESC);
> +MODULE_LICENSE("GPL");
> +
>
--
Jiri Kosina
SUSE Labs
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