On Wed, Dec 4, 2019 at 1:49 AM Pintu Agarwal wrote:
>
> On Wed, 4 Dec 2019 at 00:28, anish singh wrote:
> >
> > On Tue, Dec 3, 2019 at 6:12 AM Pintu Agarwal wrote:
> > >
> > > Hi All,
> > >
> > > I have one general query.
> > >
>
On Tue, Dec 3, 2019 at 6:12 AM Pintu Agarwal wrote:
>
> Hi All,
>
> I have one general query.
>
> If an interrupt handler is NOT getting called (for one device) after
> the system resume (from snapshot image), then what could be the issue?
Most likely during resume the interrupt was not enabled.
On Fri, Nov 29, 2019 at 12:53 PM Primoz Beltram
wrote:
>
> I am analysing a problem with I2C bus driver where the problem shows up
> as I2C bus completely blocked. The LX driver in question is
> /drivers/i2c/busses/i2c-xiic.c.
> Problem is difficult to reproduce, it happens very rarely. So far I s
On Wed, Jun 19, 2019 at 10:47 PM Subhashini Rao Beerisetty <
subhashbeerise...@gmail.com> wrote:
> Hi All,
>
> I’ve two Linux systems, I tried to measure how long
> wait_for_completion_interruptible_timeout() blocked after completion
> is signaled by complete() call. I noticed two different result
On Wed, Jan 25, 2017 at 2:30 AM, wrote:
> Hi Anish,
>
> thanks for giving me some thougt.
> Here is what I found:
>
> On Sun, Jan 22, 2017 at 03:47:54PM -0800, anish singh wrote:
> > On Sun, Jan 22, 2017 at 1:38 PM, jo wrote:
> >
> > > root@beaglebone:~# a
On Mon, Jan 23, 2017 at 7:46 AM, Rajasekhar Pulluru <
pullururajasek...@gmail.com> wrote:
> Hi,
>
> I have a query on device tree pertaining to modelling a gpio pin as an
> interrupt source.
> I have searched mailing list archives and kernel documentation before
> posting this and couldn't get any
On Sun, Jan 22, 2017 at 1:38 PM, jo wrote:
> Hi everyone,
>
> I am currently trying to get a simple audio I2S DAC board (
> https://polyvection.com/shop/plaindac/) to work on a beaglebone green
> wireless. The components is a PCM5121, a popular one that has an existing
> driver.
>
> so far,
> - I
On Tue, Jan 3, 2017 at 10:59 PM, Pradeepa Kumar
wrote:
> my app is crashing as it is trying iterate cmsghdrs
> it got after call to recvmsg();
> To give some context
> below is the flow
>
> 32 bit app <--> my kernel module <--> 64 bit app
> my kernel module implements new protocol and
> provides
On Fri, Sep 30, 2016 at 9:23 PM, vibnwis wrote:
>
> Many thanks Anish for answering my doubts.
>
>
>> You need to find out the device address of your device.
>> find out which device is not connected and connect your device on that
>> bus and change the device tree to replace the device address.
On Fri, Apr 15, 2016 at 1:29 AM, Gadre Nayan wrote:
> Dear all,
>
> I am trying to test a dummy UIO driver to get timer interrupt events
> in Userspace.
>
> I register the UIO driver as a platform driver:
>
> static struct platform_device *uio_dummy_device;
>
> static struct device_driver uio_dum
On Sat, Oct 17, 2015 at 11:25 AM, venu gangireddy wrote:
> Hi,
>
> Currently, I am learning about CFS scheduler in linux, and I want to know
> reason about the data structure chooses in CFS implementation.
>
> Nice.
> CFS scheduler picks next process based on minimum virtual time and to get
> th
On Tue, Sep 8, 2015 at 10:19 AM, Daniel. wrote:
> Hi all,
>
> I'm dealing with a SPI driver and I have a doubt. I need to read and write
> data to spi (registers and values) inside interrupt handler. I want to know
> if this pattern is safe or if I'll face problems with it.
>
AFAIK the spi calls
On Mon, Jul 20, 2015 at 3:03 AM, Ahmed Soliman
wrote:
> currently I started reading through the linux kernel and I started
> reading liunx/include/linux/list.h> I understood some of the functions
> but still I dont know what does these lines of code do
> #ifndef _LINUX_LIST_H
> #define _LINUX_LIS
On Wed, Jun 24, 2015 at 12:49 PM, Mayur Patil wrote:
> Hi All,
>
>I am conducting one workshop at FUDCon in which I am trying to teach
> how to write
>
Great
>
> and send your first linux kernel device driver. Could please suggest me
> the place where I
>
> can guide the students to send th
On Mon, May 18, 2015 at 12:23 PM, Airton Ishimori
wrote:
> Hello, everybody,
>
> I'm trying to develop a new Ethernet driver (Realtek) for Linux kernel
> 4.0.2.
>
> [3.612938] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
>
> As part of my studies, I'm trying to trace the path for functions
On Mon, Feb 2, 2015 at 11:26 AM, Bas Peters wrote:
> Hi,
>
> I was checking some code in drivers/isdn/isdn_pp and came across the
> following:
>
> case PPP_VJC_COMP:
> if (is->debug & 0x20)
> printk(KERN_DEBUG "isdn_ppp: VJC_COMP\n");
>
On Tue, Jan 6, 2015 at 1:37 AM, nawab wrote:
> hi friends ,
>
> i have a simple doubt when i was looking on linux/list.h
>
> I have seen that INIT_LIST_HEAD and LIST_HEAD_INIT are performing the
> same functionality,the major difference is
> the argument passed.
>
yes but that is minor differe
inline answers.
On Fri, Oct 24, 2014 at 8:04 AM, Oscar Salvador <
osalvador.vilard...@gmail.com> wrote:
> Hi!
>
> I have a doubt about interrupts and spin locks.
> I'm not sure if I'm in the good way:
>
> When an interrupt is raised, the kernel (through do_IRQ and etc)
> acknowledges the interrup
On Sat, Aug 16, 2014 at 7:45 PM, Nick Krause wrote:
> I would like to read the code for these drivers and am not sure where
>
which drivers?
> the code for them is.
> If someone can send me the directory that would be great as I am not
>
which directory?
> sure where the
> code is.
> Thanks Nic
On Jul 27, 2014 2:01 AM, "Rahul Garg" wrote:
>
> Hi All,
>
> I am trying to run checkpatch.pl on linux-next tree's staging folder.
> But whatever sub directory, I try to run it on. It is giving me the
> same error for all the files :
>
> ERROR: Does not appear to be a unified-diff format patch
Use
On Wed, Jul 23, 2014 at 10:37 PM, Kristofer Hallin <
kristofer.hal...@gmail.com> wrote:
> Seems like you got some great guidance too.
>
> https://lkml.org/lkml/2014/7/23/443
> On 24 Jul 2014 06:38, "Nick Krause" wrote:
>
>> As a new kernel developer I seem to have sent out some bad patches and
>>
On Tue, Jun 24, 2014 at 11:09 PM, lx wrote:
> hi all:
>I'm confused with pr_debug. My codes is:
> ###
> #include
> #include
>
> static int __init init_page_dir(void)
> {
> pr_debug("Hello world\n");
>
use printk or do echo "file_name +p" >
/sy
Joe can help you with that.
On Sun, Jun 8, 2014 at 7:29 AM, lx wrote:
> hi all:
> I used the script of checkpatch.pl, but some error messages appeared.
> ##
> [root@localhost kernel_test]# perl checkpatch.pl -f task_01.c
> Nested quantifiers in regex; mar
On Sun, Feb 16, 2014 at 10:36 PM, Jay Aurabind wrote:
> Dear all,
>
> I've been going through Robert Love's LKD. Here is an excerpt from it
> regarding registration of interrupt handlers:
>
> "When request_irq() is called with IRQF_SHARED specified, the call succeeds
> only if the interrupt line i
On Feb 13, 2014 10:29 AM, "m silverstri"
wrote:
>
> I have an output buffer in my kernel driver. And that share with my
> hardware, which uses it for output.
>
> When I got an interrupt, the kernel driver will copy the data from the
> output buffer to user space buffer.
>
> How can I invalidate ca
On Wed, Feb 5, 2014 at 6:26 PM, m silverstri
wrote:
> Hi,
>
> I am developing a kernel driver. I need to allocate buffer in the
> kernel driver and pass the physical address of the buffer to the Chip
> register so that it can generate output there.
Can you elaborate more here?
>
> I tried using km
On Sat, Feb 1, 2014 at 11:49 PM, m silverstri
wrote:
> On Sat, Feb 1, 2014 at 5:34 AM, Josh Cartwright wrote:
>> On Sat, Feb 01, 2014 at 01:32:49AM -0800, anish singh wrote:
>>> On Sat, Feb 1, 2014 at 1:15 AM, m silverstri
>>> wrote:
>>> > By driver code ,
ter_value
x_variable=0
wait_for_event*(x_variable);
}
interrupt_handler(){
x_variable=1
wake_up();
}
request_irq(interrupt_handler);
>
>
> On Sat, Feb 1, 2014 at 1:06 AM, anish singh
> wrote:
>> On Sat, Feb 1, 2014 at 1:03 AM, m silverstri
>> wrote:
>>> On Sat, Feb 1
On Sat, Feb 1, 2014 at 1:03 AM, m silverstri
wrote:
> On Sat, Feb 1, 2014 at 12:48 AM, anish singh
> wrote:
>> On Sat, Feb 1, 2014 at 12:32 AM, m silverstri
>> wrote:
>> don't top-post
>>
>>> In my driver code,
>>> I want to set a bit in a
until the interrupt is sent from the HW.
so i suppose this is what you want to do.
write ->register->interrupt happens->disable register ->handle interrupt
--->enable register.
Look at any driver code from linux kernel code and it mostly does this.
>
>
>
> On Sat, Feb 1,
On Fri, Jan 31, 2014 at 11:55 PM, m silverstri
wrote:
> Hi,
>
> I read this article http://www.linuxjournal.com/article/5833 to learn
> about spinlock. I try this to use it in my kernel driver.
>
> Here is what my driver code needs to do:
> In f1(), it will get the spin lock, and caller can call f
On Tue, Jan 28, 2014 at 11:20 AM, m silverstri
wrote:
> Hi,
>
> I am writing a kernel driver, can you please tell me how can I
> allocate a buffer which is 32 byte aligned?
malloc already aligns memory for basic data types AFAIK
>
> Thank you.
>
> ___
>
On Thu, Dec 12, 2013 at 12:21 PM, Filipe David Manana
wrote:
> Hello,
>
> I have a list that is manipulated by several threads. Insert, remove
> and iteration are protected by a lock. Is the locking necessary too
> just for checking if the list is empty, i.e., is list_empty()
> atomic/safe to call
On Mon, Dec 2, 2013 at 10:34 PM, Vipul Jain wrote:
> Hi,
>
> I would like to move the hardware watchdog pet code from user space to
> kernel space inside the ipmi module and would like to know how to go about
> pet the hardware watchdog at periodic interval. Any pointers help will be
a cursory gla
On Mon, Nov 18, 2013 at 10:20 PM, Arun KS wrote:
> Hi Rajat,
>
> On Fri, Nov 15, 2013 at 8:46 PM, Rajat Jain wrote:
>> Hi,
>>
>> I have a single work queue, on which I have scheduled a worker function
>> [using queue_work(wq, fn)] in interrupt context.
>>
>> I get the interrupt twice before the
On Fri, Nov 15, 2013 at 5:01 PM, Rajat Sharma wrote:
> Hi Rajat,
>
>
> On Fri, Nov 15, 2013 at 7:16 AM, Rajat Jain wrote:
>>
>> Hi,
>>
>> I have a single work queue, on which I have scheduled a worker function
>> [using queue_work(wq, fn)] in interrupt context.
>>
>> I get the interrupt twice bef
On Fri, Nov 15, 2013 at 5:01 PM, Rajat Sharma wrote:
> Hi Rajat,
>
>
> On Fri, Nov 15, 2013 at 7:16 AM, Rajat Jain wrote:
>>
>> Hi,
>>
>> I have a single work queue, on which I have scheduled a worker function
>> [using queue_work(wq, fn)] in interrupt context.
>>
>> I get the interrupt twice bef
an open /dev node. How do i do something similar using a platform
driver like the one above?
>
> Thanks & Regards,
> Sanchayan.
>
>
>
>
> On Sun, Nov 10, 2013 at 2:02 AM, anish singh
wrote:
>>
>>
>> On Nov 9, 2013 4:18 AM, "sanchayan maity"
On Nov 9, 2013 4:18 AM, "sanchayan maity" wrote:
>
> Can someone give me some pointers or tell me as to how can one use a
platform driver for reading and writing?
>
> For example, if i have a wm97xx codec IC, a core platform driver is
provided (as on the below link).
>
http://lxr.free-electrons.co
On Nov 6, 2013 10:38 PM, "Mandeep Sandhu" wrote:
>
> On Thu, Nov 7, 2013 at 11:04 AM, sdptr...@gmail.com
> wrote:
> > While going through kernel source , I came across this ALIGN macro
> >
> > #define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
> >
> > and
> >
> > #define __ALIGN_KERNEL(x,
>
> On Sat, Nov 2, 2013 at 9:20 PM, anish singh
> wrote:
>>
>>
>>
>>
>> On Sat, Nov 2, 2013 at 7:42 PM, Shyam Sunkara wrote:
>>>
>>> Hi All,
>>>
>>> I'm allocating a memory for linux driver using the kmalloc and I need to
On Sat, Nov 2, 2013 at 7:42 PM, Shyam Sunkara wrote:
> Hi All,
>
> I'm allocating a memory for linux driver using the kmalloc and I need to
> align it to 32 bit how do I do it?
>
Did you mean 32 bit or byte?
>
>
> Thank you,
>
> Regards,
> Omk
>
> ___
On Fri, Oct 18, 2013 at 5:26 AM, Mushtaq Khan wrote:
> Hi,
>
> In kernel driver, using Semaphore to block on resources (Descriptors and
> memory).
> Semaphore is initialized in locking state using call "init_MTEX_LOCKED()",
> when resources are not available process calls down_interruptible() and
On Oct 3, 2013 8:28 PM, "sujan dutta" wrote:
>
>
> Yes you can, infact network subsystem softirq are reactive so it can run
again.
> however, reactivated softirq are not immediately process but until kernel
handles the pending softirqs because it might introduce latency in
user-space.
> And for be
On Sep 21, 2013 7:35 PM, "Ravi Teja" wrote:
>
> Hello Ratheesh,
>
> I have intentionally used MAP_FIXED flag as I am interested in mapping to
0x.
AFAICS in linux generally mapping to null address is not allowed as this
decision helps in debugging null dereference errors.
>
> Even after set
On Sep 20, 2013 2:25 PM, "Niroj Pokhrel" wrote:
>
> Hi all,
> I want to implement a device driver with mmap operations. However, I am
not using ioctl call.
> My approach:
> i. I have created a sysfs bin files (because it support mmap)
Why you want to implement mmap for sysfs file?
What are you try
On Sep 14, 2013 8:57 PM, "Dmitry Kolesov" wrote:
>
> Thanks for reply.
> I have problem with headphone on my laptop.
> I can not listen sound from speakers after reboot laptop if I power off
laptop with headphone.
> And I need to plug/unplug headphone to listen music from speakers.
I suggest seeki
On Aug 5, 2013 10:24 PM, "Sumeet pawnikar" wrote:
>
> Hi Valdis,
>
> Thanks for these steps,
>
> On Wed, Jul 31, 2013 at 6:05 PM, wrote:
>>
>> On Wed, 31 Jul 2013 10:32:59 +0530, you said:
>>
>> > I am a computer science student. I want to contribute to the open
source
>> > projects, debugging. A
On Aug 3, 2013 3:02 AM, "neha naik" wrote:
>
> Hi All,
> I looked into my issue and i had only one cpu on that machine and i was
getting messages like process # waiting for # secs.
> My theory is that this process was of doing some kind of busy looping on
that cpu so that the operating system c
On Sat, Jul 20, 2013 at 2:04 PM, Don Raikes wrote:
> Hello all,
>
> ** **
>
> I am very new to kernel programming. In fact, I have been working on it
> for a week now.
>
> ** **
>
> I am taking a computer science class, and one of our assignments is to
> hook some of the system calls in a
instruction :
>
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0662b/BABHBAAB.html
> CPSID i ; Disable all interrupts except NMI (set PRIMASK.PM)
> Registers overview :
>
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0662b/CHDBIBGJ.html
> About PRIMASK
On Fri, May 24, 2013 at 1:14 PM, Jean Delvare wrote:
> Hi Anish, Mylène,
>
> On Fri, 24 May 2013 12:52:40 +0530, anish singh wrote:
>> On Fri, May 24, 2013 at 12:41 PM, Mylene Josserand
>> wrote:
>> > I have read that this function "i2c_smbus_write_byte_dat
On Fri, May 24, 2013 at 12:41 PM, Mylene Josserand
wrote:
> Hi all,
>
>
> I am learning how i2c is working and I read that, to write in an i2c
> register, I need to use the function "i2c_smbus_write_byte_data".
Only in case your device is smbus compliant.
> I wanted to know how the message are ha
kernel panic logs?
On Wed, May 1, 2013 at 10:57 AM, Kumar amit mehta wrote:
> Hi,
>
> I'm new to block layer in linux and to learn the same, I'm trying to
> come up with a sample memory based block device driver, with which I can
> experiment and learn along the way. I'm referring to sample code
does I2c-stub create the /dev node?If it is not creating then you
have to do it yourself.
On Mon, Apr 22, 2013 at 5:11 PM, Sagar Padhye wrote:
> Hi,
>
> [USING : Ubuntu 12.04 LTS]
>
> I am trying to learn I2C subsystem. I havent found much of well documented
> things that can help a newbie on g
!! is generally used to make the return bool value.
You can use kernelnewbies and linux kernel mailing list.
On Mon, Apr 1, 2013 at 12:43 PM, Ben Wu wrote:
>
>
> Dear All：
> 1> I found some placeuse two "!!", what's means
> if(button->gpio != INVALID_GPIO)
> state = !!((gpio_get_val
el thread. And we borrow memory descriptor from this process.
and I think the memory descriptor would be changed so that it can point
to the kernel thread.
>
> Rgs,
> Rami Rosen
> http://ramirose.wix.com/ramirosen
>
>
>
>
>
>
> On Mon, Mar 25, 2013 at 8:02 AM, ani
On Mon, Mar 25, 2013 at 1:35 AM, Rami Rosen wrote:
> Hi, Niroj,
>
> Please look at the following scenario:
> Suppose we create a kernel thread.
> With kernel threads, the mm member of the task_struct is NULL.
> (We are not permitted to access user space addresses from kernel thread,
> so we don't
handle_edge_irq in kernel/irq/
>
> Did I understand correctly ?
> rgs
> Kevin
>
> On Thu, Mar 7, 2013 at 5:00 PM, anish singh
> wrote:
>> On Thu, Mar 7, 2013 at 7:28 PM, Kevin Wilson wrote:
>>> Hello,
>>> what is the difference between disabl
On Thu, Mar 7, 2013 at 7:28 PM, Kevin Wilson wrote:
> Hello,
> what is the difference between disabling interrupts and masking
> interrupts ? Disabling interrupts is done, AFAIK, with irq_disable().
Disabling interrupts means that you have disabled the source of interrupt.
Masking means that you
(v7l)
> BogoMIPS: 163.38
> Features: swp half thumb fastmult vfp edsp neon vfpv3 tls
> CPU implementer : 0x51
> CPU architecture: 7
> CPU variant : 0x1
> CPU part: 0x00f
> CPU revision: 2
>
> Thanks
> Sandeep
>
>
>
>
> O
On Tue, Feb 26, 2013 at 5:01 PM, sandeep kumar
wrote:
> Hi All
> In performance benchmark tools, When we profile read/write timings mostly,
> those read/writes are done to cache only.
>
> I want to measure my DDR(RAM chip) performance.
> So i want to make sure, every read/write should happen to DD
On Wed, Feb 20, 2013 at 1:01 PM, NeonJohn wrote:
> Greetings,
>
> I just discovered this list while beating my head against the wall
> (kernel noobs do that a lot, I hear). I thought I'd introduce myself.
>
> I'm mainly an EE but with fairly extensive Unix and Linux user space
> coding and with e
adding Joe Perches as generally he looks after printk stuff.
On Fri, Feb 15, 2013 at 2:22 PM, buyitian wrote:
> is it possible that printk cause deadlock? the path is as below:
>
> 1. taskA runs on CPU0, and run schedule to acqire the rq->lock.
> 2. taskA calls printk while holding rq->lock.
> 3
On Tue, Feb 12, 2013 at 9:24 AM, Chetan Nanda wrote:
>
>
>
> On Mon, Feb 11, 2013 at 5:25 PM, anish singh
> wrote:
>>
>>
>>
>> On Mon, Feb 11, 2013 at 4:51 PM, पारस wrote:
>> > Hi All,
>> >
>> > To read/write data to user-spa
On Mon, Feb 11, 2013 at 4:51 PM, पारस wrote:
> Hi All,
>
> To read/write data to user-space from kernel-space we use copy_from_user()
> and copy_to_user() functions.
>
> What is the use of these function?
> Why kernel can't directly access user address and read/write on to it?
what will happen if
On Tue, Jan 29, 2013 at 1:14 PM, Mulyadi Santosa
wrote:
> On Mon, Jan 28, 2013 at 11:53 PM, Rami Rosen wrote:
>> Hi everyone,
>> You can find here an up to date and detailed document in pdf (178
>> pages) about Linux Kernel Networking; going deep into design and
>> implementation details as well
On Tue, Jan 22, 2013 at 11:21 AM, sandeep kumar
wrote:
> Hi all
> As far as I know jiffie counter is incremented HZ times/second. And it is
> used to measure the time lapses in the kernel code.
>
> I m seeing a case where, actualy time spent in some module using giffies is
> zero, but while seeing
On Fri, Jan 4, 2013 at 3:41 PM, Rajat Sharma wrote:
>> Is this correct for all architectures?
>
> I guess not, asmlinkage is undefined for arm, so I assume this mechanism is
> not there for arm.
then how do they do it?
>
>
>
> On Fri, Jan 4, 2013 at 2:24 PM, 卜弋天 wrote:
>>
>>
>>
>> 在 2013-1-4，15:3
On Fri, Dec 28, 2012 at 10:42 AM, amit mehta wrote:
On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
> can anybody tell me how to look into source code, as most are hidden in
> kernel.
You can find the Linux source code at http://kernel.org/ .
>> for browsing
On Fri, Dec 28, 2012 at 1:23 AM, Henrique Rodrigues
wrote:
> http://lxr.linux.no/ is a really good linux cross referencing website for
> code reference.
>
> On Thu, Dec 27, 2012 at 10:40 AM, Jonathan Neuschäfer
> wrote:
>>
>> On Thu, Dec 27, 2012 at 11:01:52PM +0530, kishore kumar wrote:
>> > can
On Dec 20, 2012 6:30 AM, "Woody Wu" wrote:
>
> Hi, List
>
> Where is the Kernel code that handles external interrupts? I want to
> have a look at it but haven't found out where it is.
>
> Actually, I have some basic questions about interrupt handling in Linux.
> 1. After Kernel's ISR received an i
On Tue, Nov 13, 2012 at 9:03 AM, Mulyadi Santosa
wrote:
> On Tue, Nov 13, 2012 at 10:37 PM, Andreas Schmidt
> wrote:
>> Hi all,
>> I wrote a GPIO watchdog for a extern simple watchdog (LTC2917). It is a
>> voltage supervisor with watchdog timer functionality. Do you think
>> should I send this to
On Wed, Jul 4, 2012 at 1:51 PM, Javier Martinez Canillas
wrote:
> On Tue, Jul 3, 2012 at 4:24 PM, Parmenides
> wrote:
>> Hi,
>>
>> It is said that kernel can not be preempted in interrupt context
>> and when it is in a critical section protected by a spin lock.
>>
>> 1. For the spinlock case
Always CC Kernelnewbies.
On Wed, Jul 4, 2012 at 12:52 AM, Parmenides wrote:
>>> 1. For the spinlock case, it is easy to get if preemption is allowed
>>> in critical section, the purpose of protection provided by spinlock
>>> can not be achieved readily.
>> I don't know what you mean here.Please c
r);
}
static ssize_t attr1_store(struct class *cls, const char *buf, size_t count)
{
printk("the string is : %s count %d\n", buf, count);
return snprintf(gvar, count, "%s\n", buf);
}
static void hello_exit(void)
{
class_unregister(&pwm_class);
On Tue, Jun 19, 2012 at 3:14 PM, jeshwanth Kumar N K
wrote:
> Hello all
>
> I am new to sysfs interface ans I read about in mochel's documentation. And
> doing some experiements on it. Let's come to Tue problem, in my module I
> have a global variable type char* myglobal and it s static, I am putt
unable to register touch irq.(%s)\r\n",
>> device->input_dev->name);
>> goto err_request_irq;
>> }
>> }
>>
>>
>>
>> The pin by default has to be initialized to Active Low.
>>
>>
>>
>>
>
On Thu, Jun 14, 2012 at 2:11 PM, siddharth saxena
wrote:
> Hi Arun
>
> I tried changing the flag to IRQF_TRIGGER_HIGH but then device is behaving
> abnormally(Hangs and is dead after some time).
> Flooding interrupts still observed. Problem not solved.
>
> I want to know, are we supposed to change
On Thu, Jun 14, 2012 at 10:34 AM, siddharth saxena
wrote:
> Hi all
>
> I need help with an issue.
> I have written a touch driver for a device and used the flag
> IRQF_TRIGGER_LOW to request irq.
> Now, when I boot the device, the touch interrupts are coming already without
> touching the screen.
On Mon, May 28, 2012 at 2:57 AM, richard -rw- weinberger
wrote:
> On Sun, May 27, 2012 at 2:02 AM, Mark Farnell wrote:
>> In the kernel, how can I find out the interrupt vector number of a
>> given IRQ (for example, IRQ7)?
>>
>> Within the kernel module, I would like to manually set the IRQ using
On Wed, Apr 18, 2012 at 4:37 PM, Philipp Ittershagen
wrote:
> On Wed, Apr 18, 2012 at 04:32:12PM +0530, anish singh wrote:
>> On Wed, Apr 18, 2012 at 4:18 PM, Philipp Ittershagen
>> wrote:
>> > On Wed, Apr 18, 2012 at 05:16:01PM +0800, Li Haifeng wrote:
>> >>
On Mon, Jan 2, 2012 at 11:23 PM, Dave Hylands wrote:
> Hi Manish,
>
> On Mon, Jan 2, 2012 at 8:13 AM, manish honap
> wrote:
>> During Kernel development what type of set-up do developers normally use ?
>> e.g. Machine configuration, virtualization environment etc.
>> or whether they use physical
On Fri, Sep 30, 2011 at 3:28 PM, sandeep kumar
wrote:
> Hi all,
>
> I was wondering what __attribute__ does in the kernel code?
> I found several definitions but couldnot come to one conclusion..
>
> __releases(x) is defined in compiler.h. What does this mean??
> # define __releases(x)
On Tue, Sep 20, 2011 at 4:11 PM, Nuno Martins
wrote:
>
>
> On Tue, Sep 20, 2011 at 5:59 AM, Amit Nagal wrote:
>>
>> On Tue, Sep 20, 2011 at 10:25 AM, rohan puri
>> wrote:
>> >
>> >
>> > On Tue, Sep 20, 2011 at 10:13 AM, Amit Nagal
>> > wrote:
>> >>
>> >> On Tue, Sep 20, 2011 at 10:05 AM, rohan
On Tue, Sep 6, 2011 at 10:14 PM, Dave Hylands wrote:
> Hi Sandeep,
>
> On Mon, Sep 5, 2011 at 1:37 AM, sandeep kumar
> wrote:
> ...snip...
>> As our analysis for the problem goes,
>> init being the critical process, when killed, platform called a system call
>> to restart the kernel.
>> is it co
On Tue, Sep 6, 2011 at 10:59 AM, anish singh
wrote:
> On Tue, Sep 6, 2011 at 10:51 AM, Mulyadi Santosa
> wrote:
>> Hi :)
>>
>> On 06/09/2011, sandeep kumar wrote:
>>> Hmm..But when i tried to take a mutex lock in threaded_irq, it is throwing a
>>> w
On Tue, Sep 6, 2011 at 10:51 AM, Mulyadi Santosa
wrote:
> Hi :)
>
> On 06/09/2011, sandeep kumar wrote:
>> Hmm..But when i tried to take a mutex lock in threaded_irq, it is throwing a
>> warning message
>> "BUG: sleeping function called from invalid context"... So i was wondering
>> which way it
On Mon, Aug 29, 2011 at 8:01 PM, Mandeep Sandhu
wrote:
>>> 1. I think oops and panic are both some way to deal with errors occurs
>>> in kernel space. Is there any relationship between them?
>> AFAIK both are same.
>>>
>
> Really? I thought "oops" would be generated for critical errors like
> proc
On Mon, Aug 29, 2011 at 2:19 AM, Parmenides wrote:
> Hi,
>
> 1. I think oops and panic are both some way to deal with errors occurs
> in kernel space. Is there any relationship between them?
AFAIK both are same.
>
> 2. I make a NULL pointer reference deliberately in a kernel module and
> get an oo
On Tue, Aug 23, 2011 at 10:52 PM, Takashi Iwai wrote:
> At Sat, 20 Aug 2011 22:21:10 +0900,
> anish singh wrote:
>>
>> adding more information and experts on alsa.
>>
>> On Fri, Aug 19, 2011 at 9:23 PM, anish singh
>> wrote:
>> > I need some suggesti
adding more information and experts on alsa.
On Fri, Aug 19, 2011 at 9:23 PM, anish singh
wrote:
> I need some suggestions for below situation:
>
> Headset if it is inserted before the device is powered up is
> now detected by forcefully calling the interrupt handler in
> the pr
Intention:
Wanted to modify the behavior of threaded interrupt handler
not being called after the threaded_handler was killed.
Reason:
Well there is no reason as such but just want to see what all
needs to be done to get this right.I know that what i am doing
is completely wrong as i would get a s
Guess, this is trivial question but probably useful to know.
void free_initmem(void)
{
#ifdef CONFIG_HAVE_TCM
extern char __tcm_start, __tcm_end;
totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
__phys_to_pfn(__pa(&__tcm_end)),
On Fri, May 27, 2011 at 10:54 PM, Mulyadi Santosa wrote:
> Hi...
>
> On Fri, May 27, 2011 at 17:49, sandeep kumar
> wrote:
> > Now the question is can we memory map a one device resource(say some
> > iomemory) to two different memory locations?
> > the other way of seeing at this question is,
>
I was looking for drivers/staging/usbvideo folder but couldn't find it
there.
Is it dropped from linux-next?If yes then will it be included in future?
Reference:
http://www.spinics.net/lists/linux-next/msg14307.html
One more question.I made a patch against
http://git.kernel.org/?p=linux/kernel/g
On Tue, May 3, 2011 at 7:50 PM, Javier Martinez Canillas <
martinez.jav...@gmail.com> wrote:
> >
> >> i'm also interesting in collecting examples of documentation for
> >> basic kernel programming concepts. sometimes, there are excellent
> >> examples in the source Documentation/ directory, som
On Thu, Apr 7, 2011 at 9:40 AM, Hanumant Singh wrote:
> HI
>
> I am looking for some documentation on the Linux mmc framework. I
> didnot find anything in the Documentation folder. Is there some book/link
> that I can refer to?
>
Linux MMC framework consists of MMC core+ SD protocol implement
On Thu, Mar 3, 2011 at 10:41 PM, Thomas Petazzoni <
thomas.petazz...@free-electrons.com> wrote:
> Hello,
>
> On Mon, 28 Feb 2011 21:23:37 +0900
> anish singh wrote:
>
> > I have a touch driver which is not yet using threded_irq.So i am planning
> to
> &g
On Tue, Mar 1, 2011 at 2:11 PM, spinlock cp wrote:
> Hi Anish
>
>
>
> On Mon, Feb 28, 2011 at 5:53 PM, anish singh > wrote:
>
>> I have a touch driver which is not yet using threded_irq.So i am planning
>> to change it to
>> use threaded_irq.
>
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