On Wed, Nov 28, 2018 at 1:36 PM Greg KH wrote:
> So you still need a char device, and you will have have a load of them,
> just use the misc device api. It's simple, clean, and is hard to get
> wrong. The cdev api is hard, complex, and trivial to get wrong in any
> number of different ways
On Wed, Nov 28, 2018 at 1:36 PM Greg KH wrote:
> So you still need a char device, and you will have have a load of them,
> just use the misc device api. It's simple, clean, and is hard to get
> wrong. The cdev api is hard, complex, and trivial to get wrong in any
> number of different ways
On Wed, Nov 28, 2018 at 01:19:05PM -0500, Sven Van Asbroeck wrote:
> On Wed, Nov 28, 2018 at 12:42 PM Greg KH wrote:
>
> > It depends on what you want to do with this device node. You can use a
> > static one in your structure if you use it to "cast back" to your real
> > structure in the
On Wed, Nov 28, 2018 at 01:19:05PM -0500, Sven Van Asbroeck wrote:
> On Wed, Nov 28, 2018 at 12:42 PM Greg KH wrote:
>
> > It depends on what you want to do with this device node. You can use a
> > static one in your structure if you use it to "cast back" to your real
> > structure in the
On Wed, Nov 28, 2018 at 12:42 PM Greg KH wrote:
> It depends on what you want to do with this device node. You can use a
> static one in your structure if you use it to "cast back" to your real
> structure in the open() call, do you do that?
I do...
static int fieldbus_open(struct inode
On Wed, Nov 28, 2018 at 12:42 PM Greg KH wrote:
> It depends on what you want to do with this device node. You can use a
> static one in your structure if you use it to "cast back" to your real
> structure in the open() call, do you do that?
I do...
static int fieldbus_open(struct inode
On Wed, Nov 28, 2018 at 10:39:41AM -0500, Sven Van Asbroeck wrote:
> Wow Greg, thanks for the review, this is awesome !!
>
> On Tue, Nov 27, 2018 at 2:54 AM Greg KH wrote:
>
> >> + cdev_init(>cdev, _fops);
> >> + err = cdev_add(>cdev, devno, 1);
> >> + if (err) {
> >> +
On Wed, Nov 28, 2018 at 10:39:41AM -0500, Sven Van Asbroeck wrote:
> Wow Greg, thanks for the review, this is awesome !!
>
> On Tue, Nov 27, 2018 at 2:54 AM Greg KH wrote:
>
> >> + cdev_init(>cdev, _fops);
> >> + err = cdev_add(>cdev, devno, 1);
> >> + if (err) {
> >> +
Wow Greg, thanks for the review, this is awesome !!
On Tue, Nov 27, 2018 at 2:54 AM Greg KH wrote:
>> + cdev_init(>cdev, _fops);
>> + err = cdev_add(>cdev, devno, 1);
>> + if (err) {
>> + pr_err("fieldbus_dev%d unable to add device %d:%d\n",
>> +
Wow Greg, thanks for the review, this is awesome !!
On Tue, Nov 27, 2018 at 2:54 AM Greg KH wrote:
>> + cdev_init(>cdev, _fops);
>> + err = cdev_add(>cdev, devno, 1);
>> + if (err) {
>> + pr_err("fieldbus_dev%d unable to add device %d:%d\n",
>> +
On Wed, Nov 21, 2018 at 10:07:03AM -0500, thesve...@gmail.com wrote:
> +static struct attribute *fieldbus_attrs[] = {
> + _attr_enabled.attr,
> + _attr_card_name.attr,
> + _attr_fieldbus_id.attr,
> + _attr_read_area_size.attr,
> + _attr_write_area_size.attr,
> +
On Wed, Nov 21, 2018 at 10:07:03AM -0500, thesve...@gmail.com wrote:
> +static struct attribute *fieldbus_attrs[] = {
> + _attr_enabled.attr,
> + _attr_card_name.attr,
> + _attr_fieldbus_id.attr,
> + _attr_read_area_size.attr,
> + _attr_write_area_size.attr,
> +
On Wed, Nov 21, 2018 at 10:07:03AM -0500, thesve...@gmail.com wrote:
> Fieldbus device (client) adapters allow data exchange with a PLC aka.
> "Fieldbus Controller" over a fieldbus (Profinet, FLNet, etc.)
>
> They are typically used when a Linux device wants to expose itself
> as an actuator,
On Wed, Nov 21, 2018 at 10:07:03AM -0500, thesve...@gmail.com wrote:
> Fieldbus device (client) adapters allow data exchange with a PLC aka.
> "Fieldbus Controller" over a fieldbus (Profinet, FLNet, etc.)
>
> They are typically used when a Linux device wants to expose itself
> as an actuator,
On Wed, Nov 21, 2018 at 10:07:03AM -0500, thesve...@gmail.com wrote:
> Fieldbus device (client) adapters allow data exchange with a PLC aka.
> "Fieldbus Controller" over a fieldbus (Profinet, FLNet, etc.)
>
> They are typically used when a Linux device wants to expose itself
> as an actuator,
On Wed, Nov 21, 2018 at 10:07:03AM -0500, thesve...@gmail.com wrote:
> Fieldbus device (client) adapters allow data exchange with a PLC aka.
> "Fieldbus Controller" over a fieldbus (Profinet, FLNet, etc.)
>
> They are typically used when a Linux device wants to expose itself
> as an actuator,
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