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SubjectRe: [PATCH 5/7] PPS: serial clients support.
On Thu, Mar 20, 2008 at 01:04:00PM -0700, Andrew Morton wrote:
> On Thu, 6 Mar 2008 13:09:04 +0100
> Rodolfo Giometti <giometti@linux.it> wrote:
>
> > Adds support for the PPS sources connected with the CD (Carrier
> > Detect) pin of a serial port.
> >
> > ...
> >
> > +#ifdef CONFIG_PPS_CLIENT_UART
> > +
> > +static int
> > +uart_register_pps_port(struct uart_state *state, struct uart_port *port)
> > +{
> > + struct tty_driver *drv = port->info->tty->driver;
> > + int ret;
> > +
> > + state->pps_info.owner = THIS_MODULE;
> > + state->pps_info.dev = port->dev;
> > + snprintf(state->pps_info.name, PPS_MAX_NAME_LEN, "%s%d",
> > + drv->driver_name, port->line);
> > + snprintf(state->pps_info.path, PPS_MAX_NAME_LEN, "/dev/%s%d",
> > + drv->name, port->line);
>
> umm, why are we hard-wiring "/dev" into the kernel source? Is it just for
> user-friendly printks?

Yes... :)

> > + state->pps_info.mode = PPS_CAPTUREBOTH | \
> > + PPS_OFFSETASSERT | PPS_OFFSETCLEAR | \
> > + PPS_CANWAIT | PPS_TSFMT_TSPEC;
> > +
> > + ret = pps_register_source(&state->pps_info, PPS_CAPTUREBOTH | \
> > + PPS_OFFSETASSERT | PPS_OFFSETCLEAR);
> > + if (ret < 0) {
> > + dev_err(port->dev, "cannot register PPS source \"%s\"\n",
> > + state->pps_info.path);
> > + return ret;
> > + }
> > + port->pps_source = ret;
> > + dev_dbg(port->dev, "PPS source #%d \"%s\" added\n",
> > + port->pps_source, state->pps_info.path);
> > +
> > + return 0;
> > +}
> > +
> > +static void
> > +uart_unregister_pps_port(struct uart_state *state, struct uart_port *port)
> > +{
> > + pps_unregister_source(port->pps_source);
> > + dev_dbg(port->dev, "PPS source #%d \"%s\" removed\n",
> > + port->pps_source, state->pps_info.path);
> > +}
> > +
> > +#else
> > +
> > +#define uart_register_pps_port(state, port) do { } while (0)
> > +#define uart_unregister_pps_port(state, port) do { } while (0)
>
> Please never implement in cpp that which can be implemented in C. These
> should have been static inlines. That's nicer, matches the
> CONFIG_PPS_CLIENT_UART=y code and provides type checking.

Are you saying that I should do:

static inline int
uart_register_pps_port(struct uart_state *state, struct uart_port *port)
{
/* Nop */
}

static inline void
uart_unregister_pps_port(struct uart_state *state, struct uart_port *port)
{
/* Nop */
}

?

Ciao,

Rodolfo

--

GNU/Linux Solutions e-mail: giometti@enneenne.com
Linux Device Driver giometti@gnudd.com
Embedded Systems giometti@linux.it
UNIX programming phone: +39 349 2432127


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