Re: [PATCH 4/4] psmouse: dynamic protocol switching via sysfs

[Dmitry Torokhov <dtor_core@ameritech.net>]

Hi Kenan,

On Sunday 03 April 2005 14:49, Kenan Esau wrote:
> Patches 1-3 are fine.
> 

Thank you very much for testing the patches. Based on the feedback I
received I am goping to drop that DMI patch - does not save enough to
justify the ifdefs...

> Protocol switching via sysfs works too but if I switch from LBPS/2 to
> PS/2 the device name changes from "/dev/event1" to "/dev/event2" -- is
> this intended?

Yes - we in fact getting somewhat a "new" device with new capabilities so
the driver unregisters old input device and creates a new one. I strongly
believe that we should not change input device attributes "on fly".

> If I do "echo -n 50 > resolution" "0xe8 0x01" is sent. I don't know if
> this is correct for "usual" PS/2-devices but for the lifebook it's
> wrong.
> 
> For the lifebook the parameters are as following:
> 
> 50cpi  <=> 0x00
> 100cpi <=> 0x01
> 200cpi <=> 0x02
> 400cpi <=> 0x03
> 

"Classic" PS/2 protocol specifies available resolutions of 1, 2, 4 and 8
units per mm which gives you 25, 50, 100 and 200 cpi respectively. I am
surprised that Lifebook simply doubles the rates, but if it does I guess
the patch below will suffice. 

-- 
Dmitry

===================================================================

Input: apparently Lifebook touchscreens have double resolution
       compared to "classic" PS/2 mice, provide appropriate
       resolution setting handler.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>


 lifebook.c |   12 ++++++++++++
 1 files changed, 12 insertions(+)

Index: dtor/drivers/input/mouse/lifebook.c
===================================================================
--- dtor.orig/drivers/input/mouse/lifebook.c
+++ dtor/drivers/input/mouse/lifebook.c
@@ -82,6 +82,17 @@ static int lifebook_absolute_mode(struct
 	return 0;
 }
 
+static void lifebook_set_resolution(struct psmouse *psmouse, unsigned int resolution)
+{
+	unsigned char params[] = { 0, 1, 2, 2, 3 };
+
+	if (resolution == 0 || resolution > 400)
+		resolution = 400;
+
+	ps2_command(&psmouse->ps2dev, &params[resolution / 100], PSMOUSE_CMD_SETRES);
+	psmouse->resolution = 50 << params[resolution / 100];
+}
+
 static void lifebook_disconnect(struct psmouse *psmouse)
 {
 	psmouse_reset(psmouse);
@@ -114,6 +125,7 @@ int lifebook_init(struct psmouse *psmous
 	input_set_abs_params(&psmouse->dev, ABS_Y, 0, 1024, 0, 0);
 
 	psmouse->protocol_handler = lifebook_process_byte;
+	psmouse->set_resolution = lifebook_set_resolution;
 	psmouse->disconnect = lifebook_disconnect;
 	psmouse->reconnect  = lifebook_absolute_mode;
 	psmouse->pktsize = 3;
-
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