linux-kernel - Re: [PATCH] Input: ALPS - Detect trackstick presence for v7 protocol

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Date:	Tue, 5 Jan 2016 17:44:21 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Hans de Goede <hdegoede@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Santiago Gala <sgala@...che.org>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Hung <alex.hung@...onical.com>
Subject: Re: [PATCH] Input: ALPS - Detect trackstick presence for v7 protocol

On Sunday 22 March 2015 14:46:11 Pali Rohár wrote:
> This patch adds detection of trackstick for v7 protocol devices. Code in this
> patch is used in official Dell touchpad linux drivers for Dell models:
> Dell Latitude E5250/5250, E5450/5450, E5550/5550
> 
> Detection code and base reg for alps v3 rushmore and v7 devices is exacly same.
> 
> Also user in bug https://bugzilla.kernel.org/show_bug.cgi?id=94801 reported
> that Toshiba Sattellite Z30-A-1DG has only alps v7 touchpad device without
> trackstick and kernel reports to userspace also redundant trackstick device.
> 
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> ---

Hello!

Alex now tested this patch on two Dell machines with ALPS: E5450 (with
TrackStick) and E5250 (without TrackStick).

With patch nothing was changed for E5450. And E5250 with patch does not
show trackstick input device anymore.

Tested-by: Alex Hung <alex.hung@...onical.com>

>  drivers/input/mouse/alps.c |   12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
> index 33198b9..c9cd27a 100644
> --- a/drivers/input/mouse/alps.c
> +++ b/drivers/input/mouse/alps.c
> @@ -30,6 +30,7 @@
>  #define ALPS_CMD_NIBBLE_10	0x01f2
>  
>  #define ALPS_REG_BASE_RUSHMORE	0xc2c0
> +#define ALPS_REG_BASE_V7	0xc2c0
>  #define ALPS_REG_BASE_PINNACLE	0x0000
>  
>  static const struct alps_nibble_commands alps_v3_nibble_commands[] = {
> @@ -1795,7 +1796,7 @@ static int alps_absolute_mode_v3(struct psmouse *psmouse)
>  	return 0;
>  }
>  
> -static int alps_probe_trackstick_v3(struct psmouse *psmouse, int reg_base)
> +static int alps_probe_trackstick_v3_v7(struct psmouse *psmouse, int reg_base)
>  {
>  	int ret = -EIO, reg_val;
>  
> @@ -1880,7 +1881,7 @@ static int alps_hw_init_v3(struct psmouse *psmouse)
>  	int reg_val;
>  	unsigned char param[4];
>  
> -	reg_val = alps_probe_trackstick_v3(psmouse, ALPS_REG_BASE_PINNACLE);
> +	reg_val = alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_PINNACLE);
>  	if (reg_val == -EIO)
>  		goto error;
>  
> @@ -2260,8 +2261,8 @@ static int alps_set_protocol(struct psmouse *psmouse,
>  		priv->x_bits = 16;
>  		priv->y_bits = 12;
>  
> -		if (alps_probe_trackstick_v3(psmouse,
> -					     ALPS_REG_BASE_RUSHMORE) < 0)
> +		if (alps_probe_trackstick_v3_v7(psmouse,
> +						ALPS_REG_BASE_RUSHMORE) < 0)
>  			priv->flags &= ~ALPS_DUALPOINT;
>  
>  		break;
> @@ -2311,6 +2312,9 @@ static int alps_set_protocol(struct psmouse *psmouse,
>  		if (priv->fw_ver[1] != 0xba)
>  			priv->flags |= ALPS_BUTTONPAD;
>  
> +		if (alps_probe_trackstick_v3_v7(psmouse, ALPS_REG_BASE_V7) < 0)
> +			priv->flags &= ~ALPS_DUALPOINT;
> +
>  		break;
>  	}
>  

-- 
Pali Rohár
pali.rohar@...il.com
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