Re: [rfc/rft] Fujitsu B-Series Lifebook PS/2 TouchScreen driver

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Tue, 15 Feb 2005 14:43:08 +0100, Vojtech Pavlik <vojtech@suse.cz> wrote:
> On Tue, Feb 15, 2005 at 09:57:59AM +0100, Kenan Esau wrote:
> > +static struct dmi_system_id lifebook_dmi_table[] = {
> > +     {
> > +             .ident = "Fujitsu Siemens Lifebook B-Sereis",
> > +             .matches = {
> > +                     DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK B Series"),
> > +             },
> > +     },
> > +     { }
> > +};
> 
> This might be a bit too much generic. Are you sure there are no B Series
> lifebooks without a touchscreen?
> 

And another concern: does this notebook (or others using this
touchscreen) have an active MUX? We don't want to force LBTOUCH
protocol on an external mouse.

> > +static psmouse_ret_t lifebook_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
> > +{
> > +     unsigned char *packet = psmouse->packet;
> > +     struct input_dev *dev = &psmouse->dev;
> > +
> > +        unsigned long x = 0;
> > +        unsigned long y = 0;
> > +        static uint8_t pkt_lst_touch = 0;
> > +     static uint8_t pkt_cur_touch = 0;
> > +     uint8_t pkt_lb = packet[0] & LBTOUCH_LB;
> > +     uint8_t pkt_rb = packet[0] & LBTOUCH_RB;

We usually don't use userspace types here. unsigned char or u8 for kernel. 

> > +
> > +                psmouse->protocol_handler = lifebook_process_byte;
> > +                psmouse->disconnect = lifebook_disconnect;
> > +                psmouse->reconnect  = lifebook_initialize;
> > +                psmouse->initialize = lifebook_initialize;
> > +                psmouse->pktsize = 3;
> > +     }
> > +
> > +     return 0;
> > +}
> 
> The change to the psmouse interface I'm leaving to Dmitry to comment on.

I don't think that we need a separate initialize handler simply
because it is called just once, at initialization time. Here we know
exactly what device (protocol) we are dealing with, no need for
indirection.

-- 
Dmitry