linux-kernel - Re: 2.6.{28,30} Keyboard not working on oldish machine

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Date:	Sat, 12 Sep 2009 16:00:20 +0100
From:	"Dr. David Alan Gilbert" <linux@...blig.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Jiri Kosina <jkosina@...e.cz>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: 2.6.{28,30} Keyboard not working on oldish machine

* Dmitry Torokhov (dmitry.torokhov@...il.com) wrote:

<snip>

> Bah, that one was completely screwed up, please try this one instead.

Yep - that works nicely.  Thanks.

Dave

> 
> Thanks!
> 
> -- 
> Dmitry
> 
> Input: i8042 - try disabling and re-enabling AUX port at close
> 
> From: Dmitry Torokhov <dmitry.torokhov@...il.com>
> 
> Ever since we switched from having a polling timer to registering IRQ
> handlers for both keyboard and AUX ports at the driver registration
> time, on certain boxes probing for a mouse results in keyboard
> stopping working. The only real difference between old and new way is
> that before we disabled ports after unsuccessful probe whereas now we
> leave them as is. Try to emulate the old behavior by disabling and
> immediately re-enabling AUX and KBD ports when corresponding serio
> port is being closed.
> 
> Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
> ---
> 
>  drivers/input/serio/i8042.c |   50 ++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 49 insertions(+), 1 deletions(-)
> 
> 
> diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
> index b53a015..8aaf8fc 100644
> --- a/drivers/input/serio/i8042.c
> +++ b/drivers/input/serio/i8042.c
> @@ -264,6 +264,49 @@ static int i8042_aux_write(struct serio *serio, unsigned char c)
>  					I8042_CMD_MUX_SEND + port->mux);
>  }
>  
> +
> +/*
> + * i8042_aux_close attempts to clear AUX or KBD port state by disabling
> + * and then re-enabling it.
> + */
> +
> +static void i8042_port_close(struct serio *serio)
> +{
> +	int irq_bit;
> +	int disable_bit;
> +	const char *port_name;
> +
> +	if (serio == i8042_ports[I8042_AUX_PORT_NO].serio) {
> +		irq_bit = I8042_CTR_AUXINT;
> +		disable_bit = I8042_CTR_AUXDIS;
> +		port_name = "AUX";
> +	} else {
> +		irq_bit = I8042_CTR_KBDINT;
> +		disable_bit = I8042_CTR_KBDDIS;
> +		port_name = "KBD";
> +	}
> +
> +	i8042_ctr &= ~irq_bit;
> +	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
> +		printk(KERN_WARNING
> +			"i8042.c: Can't write CTR while closing %s port.\n",
> +			port_name);
> +
> +	udelay(50);
> +
> +	i8042_ctr &= ~disable_bit;
> +	i8042_ctr |= irq_bit;
> +	if (i8042_command(&i8042_ctr, I8042_CMD_CTL_WCTR))
> +		printk(KERN_ERR "i8042.c: Can't reactivate %s port.\n",
> +			port_name);
> +
> +	/*
> +	 * See if there is any data appeared while we were messing with
> +	 * port state.
> +	 */
> +	i8042_interrupt(0, NULL);
> +}
> +
>  /*
>   * i8042_start() is called by serio core when port is about to finish
>   * registering. It will mark port as existing so i8042_interrupt can
> @@ -393,7 +436,7 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
>  }
>  
>  /*
> - * i8042_enable_kbd_port enables keybaord port on chip
> + * i8042_enable_kbd_port enables keyboard port on chip
>   */
>  
>  static int i8042_enable_kbd_port(void)
> @@ -841,6 +884,9 @@ static void i8042_controller_reset(void)
>  	i8042_ctr |= I8042_CTR_KBDDIS | I8042_CTR_AUXDIS;
>  	i8042_ctr &= ~(I8042_CTR_KBDINT | I8042_CTR_AUXINT);
>  
> +	if (i8042_command(&i8042_initial_ctr, I8042_CMD_CTL_WCTR))
> +		printk(KERN_WARNING "i8042.c: Can't write CTR while resetting.\n");
> +
>  /*
>   * Disable MUX mode if present.
>   */
> @@ -1026,6 +1072,7 @@ static int __devinit i8042_create_kbd_port(void)
>  	serio->write		= i8042_dumbkbd ? NULL : i8042_kbd_write;
>  	serio->start		= i8042_start;
>  	serio->stop		= i8042_stop;
> +	serio->close		= i8042_port_close;
>  	serio->port_data	= port;
>  	serio->dev.parent	= &i8042_platform_device->dev;
>  	strlcpy(serio->name, "i8042 KBD port", sizeof(serio->name));
> @@ -1056,6 +1103,7 @@ static int __devinit i8042_create_aux_port(int idx)
>  	if (idx < 0) {
>  		strlcpy(serio->name, "i8042 AUX port", sizeof(serio->name));
>  		strlcpy(serio->phys, I8042_AUX_PHYS_DESC, sizeof(serio->phys));
> +		serio->close = i8042_port_close;
>  	} else {
>  		snprintf(serio->name, sizeof(serio->name), "i8042 AUX%d port", idx);
>  		snprintf(serio->phys, sizeof(serio->phys), I8042_MUX_PHYS_DESC, idx + 1);
> --
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-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    | Running GNU/Linux on Alpha,68K| Happy  \ 
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