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SubjectRe: Writing a driver for a legacy serial device
Hi Jean,

On 6/19/07, Jean Delvare <khali@linux-fr.org> wrote:
> Hi all,
>
> I want to write a Linux kernel driver for a device which connects to
> the legacy serial port. I started writing a driver, however I am
> already stuck at the very beginning. The .connect function of my serial
> driver is never called, and I just don't get why. I couldn't find any
> documentation about writing such a legacy driver in Documentation nor
> in LDD3. Is there anyone out there which could lend a helping hand?
>
> I know that the device and my serial port both work. I can talk to the
> device using minicom just fine. I have the following drivers loaded:
>
> $ lsmod | grep 8250
> 8250_pnp 11648 0
> 8250 23464 1 8250_pnp
> serial_core 19392 1 8250
>
> Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
> 00:08: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
>
> But I need to implement my driver in kernel space. My code looks like
> this:
>
> static struct serio_device_id taos_serio_ids[] = {
> {
> .type = SERIO_RS232,
> .proto = SERIO_ANY,
> .id = SERIO_ANY,
> .extra = SERIO_ANY,
> },
> { 0 }
> };
> MODULE_DEVICE_TABLE(serio, taos_serio_ids);
>
> static struct serio_driver taos_drv = {
> .driver = {
> .name = "taos-evm",
> },
> .description = "TAOS evaluation module driver",
> .id_table = taos_serio_ids,
> .connect = taos_connect,
> .disconnect = taos_disconnect,
> .interrupt = taos_interrupt,
> };
>
> static int __init taos_init(void)
> {
> return serio_register_driver(&taos_drv);
> }
>
> static void __exit taos_exit(void)
> {
> serio_unregister_driver(&taos_drv);
> }
>
> The problem is that taos_connect is never called. I suppose that I need
> different values for .type, .proto or .id, except that I just don't
> know what to put there. I tried a few random values without success.
> What's the trick?
>

You need to load serport modue and play with inputattach utility.

--
Dmitry
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