linux device drivers 2nd edition pdf download
o'reilly - linux device drivers 2nd edition
Ngày tải lên :
25/03/2014, 10:48
... device_ close instead of
device_ release. Either way, the device method should perfor m the following
tasks:
ã Deallocate anything that open allocated in filp->private_data
ã Shut down the device ... THREE
CHAR DRIVERS
The goal of this chapter is to write a complete char device driver. We’ll develop a
character driver because this class is suitable for most simple hardware devices.
Char drivers ... imple-
mentations. For example, the video-for -linux set of drivers is split into a generic
module that exports symbols used by lower-level device drivers for specific hard-
war e. According to...
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LINUX DEVICE DRIVERS 3rd edition phần 4 pdf
Ngày tải lên :
09/08/2014, 04:21
... there. The devices are released when scull_cleanup is called.
This code uses the generic Linux linked list mechanism in preference to reimple-
menting the same capability from scratch. Linux lists ... discussion of
device methods.
static int scull_c_release(struct inode *inode, struct file *filp)
{
/*
* Nothing to do, because the device is persistent.
* A `real' cloned device should ... release the device */
return 0;
}
Normally, we recommend that you put the open flag scull_s_available within the
device structure (
Scull_Dev here) because, conceptually, it belongs to the device. ...
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Tài liệu Linux Device Drivers Linux Device Drivers, Third Edition pot
Ngày tải lên :
21/02/2014, 19:20
... of the Book, eMatter Edition
Copyright â 2005 O’Reilly & Associates, Inc. All rights reserved.
Classes of Devices and Modules
|
7
Block devices
Like char devices, block devices are accessed ... reader), or a network device (a USB Ethernet interface).
Other classes of device drivers have been added to the kernel in recent times, includ-
ing FireWire drivers and I2O drivers. In the same ... code without being overwhelmed by com-
plexity. Often, device drivers provide that gateway.
Device drivers take on a special role in the Linux kernel. They are distinct “black
boxes” that make...
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linux device drivers third edition
Ngày tải lên :
24/04/2014, 15:28
... code without being overwhelmed by com-
plexity. Often, device drivers provide that gateway.
Device drivers take on a special role in the Linux kernel. They are distinct “black
boxes” that make ... more and more functionality in Linux is being modularized.
Classes of Devices and Modules
The Linux way of looking at devices distinguishes between three fundamental device
types. Each module usually ... of the Book, eMatter Edition
Copyright â 2010 O’Reilly & Associates, Inc. All rights reserved.
Classes of Devices and Modules
|
7
Block devices
Like char devices, block devices are accessed...
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LINUX DEVICE DRIVERS 3rd edition phần 1 ppt
Ngày tải lên :
09/08/2014, 04:21
... of the Book, eMatter Edition
Copyright â 2005 O’Reilly & Associates, Inc. All rights reserved.
8
|
Chapter 1: An Introduction to Device Drivers
In addition to device drivers, other functionalities, ... writing drivers for PCI devices, and
Chapter 13 examines the API for working with USB devices.
With an understanding of peripheral buses in place, we can take a detailed look at the
Linux device ... plan for the
fourth edition, and look for a fourth author to help.
Greg’s Introduction
It seems like a long time ago that I picked up the first edition of this Linux Device
Drivers book in order...
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LINUX DEVICE DRIVERS 3rd edition phần 2 pptx
Ngày tải lên :
09/08/2014, 04:21
... -f /dev/$ {device} [0-3]
major=$(awk "\\$2= =\"$module\" {print \\$1}" /proc/devices)
mknod /dev/$ {device} 0 c $major 0
mknod /dev/$ {device} 1 c $major 1
mknod /dev/$ {device} 2 ... the cdev structure, num is the first device number to which this device
responds, and
count is the number of device numbers that should be associated with
the device. Often
count is one, but there ... option.
CONFIG_INPUT_EVBUG
This option (under Device drivers/ Input device support”) turns on verbose log-
ging of input events. If you are working on a driver for an input device, this
option may be helpful....
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LINUX DEVICE DRIVERS 3rd edition phần 3 potx
Ngày tải lên :
09/08/2014, 04:21
... scull_nr_devs; i++) {
scull_devices[i].quantum = scull_quantum;
scull_devices[i].qset = scull_qset;
init_MUTEX(&scull_devices[i].sem);
scull_setup_cdev(&scull_devices[i], i);
}
Note that ... implementing
device control this way is that the user can control the device just by writing data,
without needing to use (or sometimes write) programs built just for configuring the
device. When devices ... the two techniques would be avoided.
Device Control Without ioctl
Sometimes controlling the device is better accomplished by writing control
sequences to the device itself. For example, this technique...
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LINUX DEVICE DRIVERS 3rd edition phần 5 pps
Ngày tải lên :
09/08/2014, 04:21
... pointer to
your device data structure in
dev_id, so a driver that manages several instances of the
same device doesn’t need any extra code in the interrupt handler to find out which
device is in ... devices can be controlled using nothing but their I/O regions, most
real devices are a bit more complicated than that. Devices have to deal with the
external world, which often includes things ... processor’s attention. Linux handles interrupts in much
the same way that it handles signals in user space. For the most part, a driver need
only register a handler for its device s interrupts,...
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LINUX DEVICE DRIVERS 3rd edition phần 6 pps
Ngày tải lên :
09/08/2014, 04:21
... device, control how that single device looks to
the host computer as a USB device. As the term “USB device drivers is very confus-
ing, the USB developers have created the term “USB gadget drivers ... system
and drivers on a device. The USB drivers for a host system control the USB devices
that are plugged into it, from the host’s point of view (a common USB host is a desk-
top computer.) The USB drivers ... remembering that each device
board can host up to eight devices; each device uses a single interrupt pin and reports
it in its own configuration register. Different devices on the same device board can
use...
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LINUX DEVICE DRIVERS 3rd edition phần 7 pps
Ngày tải lên :
09/08/2014, 04:21
... idVendor/idProduct/bcdDevice that specifies those USB
device- specific fields
TYPE
A string in the format bDeviceClass/bDeviceSubClass/bDeviceProtocol that speci-
fies those USB device- specific fields
If the
bDeviceClass ... the usual pair of functions:
int device_ create_file(struct device *device,
struct device_ attribute *entry);
void device_ remove_file(struct device *dev,
struct device_ attribute *attr);
The dev_attrs ... 14-3. Device- creation process
driver
probe
driver
initializes
device
PCI driver
bind device
to driver
create
sysfs links
pci _device_ probe
pci_bus_match
pci_hotplug
initialize
device
register
device
dev_hotplug
bus
match
probe
register
kobject
hotplug
call_usermodehelper
Driver...
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LINUX DEVICE DRIVERS 3rd edition phần 8 doc
Ngày tải lên :
09/08/2014, 04:21
... below require a pointer to a
struct device. This structure is
the low-level representation of a device within the Linux device model. It is not
something that drivers often have to work with directly, ... that describes your device. For example, it can be found as the
dev field
in
struct pci _device or struct usb _device. The device structure is covered in detail
in Chapter 14.
Drivers that use the ... is to configure the device board. This device-
specific task usually consists of reading or writing a few I/O ports. Devices differ in
significant ways. For example, some devices expect the programmer...
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