linux-kernel - Re: [PATCH RFC v2 1/9] Input: atmel_mxt_ts - improve touchscreen size/orientation handling

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Message-ID: <20160111232428.GB39766@dtor-ws>
Date:	Mon, 11 Jan 2016 15:24:28 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Nick Dyer <nick.dyer@...ev.co.uk>
Cc:	Benson Leung <bleung@...omium.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, Alan Bowens <Alan.Bowens@...el.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH RFC v2 1/9] Input: atmel_mxt_ts - improve touchscreen
 size/orientation handling

On Thu, Dec 24, 2015 at 01:49:20PM +0000, Nick Dyer wrote:
> Both T100 and T9 handle range and orientation in a similar fashion.
> Reduce duplication between the two implementations.
> 
> Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>

Applied, thank you.

> ---
>  drivers/input/touchscreen/atmel_mxt_ts.c | 68 ++++++++++++--------------------
>  1 file changed, 26 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
> index c562205..4a1d218 100644
> --- a/drivers/input/touchscreen/atmel_mxt_ts.c
> +++ b/drivers/input/touchscreen/atmel_mxt_ts.c
> @@ -113,8 +113,8 @@ struct t7_config {
>  #define MXT_T9_DETECT		(1 << 7)
>  
>  struct t9_range {
> -	u16 x;
> -	u16 y;
> +	__le16 x;
> +	__le16 y;
>  } __packed;
>  
>  /* MXT_TOUCH_MULTI_T9 orient */
> @@ -216,6 +216,7 @@ struct mxt_data {
>  	unsigned int irq;
>  	unsigned int max_x;
>  	unsigned int max_y;
> +	bool xy_switch;
>  	bool in_bootloader;
>  	u16 mem_size;
>  	u8 t100_aux_ampl;
> @@ -1665,8 +1666,8 @@ static int mxt_read_t9_resolution(struct mxt_data *data)
>  	if (error)
>  		return error;
>  
> -	le16_to_cpus(&range.x);
> -	le16_to_cpus(&range.y);
> +	data->max_x = get_unaligned_le16(&range.x);
> +	data->max_y = get_unaligned_le16(&range.y);
>  
>  	error =  __mxt_read_reg(client,
>  				object->start_address + MXT_T9_ORIENT,
> @@ -1674,23 +1675,7 @@ static int mxt_read_t9_resolution(struct mxt_data *data)
>  	if (error)
>  		return error;
>  
> -	/* Handle default values */
> -	if (range.x == 0)
> -		range.x = 1023;
> -
> -	if (range.y == 0)
> -		range.y = 1023;
> -
> -	if (orient & MXT_T9_ORIENT_SWITCH) {
> -		data->max_x = range.y;
> -		data->max_y = range.x;
> -	} else {
> -		data->max_x = range.x;
> -		data->max_y = range.y;
> -	}
> -
> -	dev_dbg(&client->dev,
> -		"Touchscreen size X%uY%u\n", data->max_x, data->max_y);
> +	data->xy_switch = orient & MXT_T9_ORIENT_SWITCH;
>  
>  	return 0;
>  }
> @@ -1708,13 +1693,14 @@ static int mxt_read_t100_config(struct mxt_data *data)
>  	if (!object)
>  		return -EINVAL;
>  
> +	/* read touchscreen dimensions */
>  	error = __mxt_read_reg(client,
>  			       object->start_address + MXT_T100_XRANGE,
>  			       sizeof(range_x), &range_x);
>  	if (error)
>  		return error;
>  
> -	le16_to_cpus(&range_x);
> +	data->max_x = get_unaligned_le16(&range_x);
>  
>  	error = __mxt_read_reg(client,
>  			       object->start_address + MXT_T100_YRANGE,
> @@ -1722,36 +1708,24 @@ static int mxt_read_t100_config(struct mxt_data *data)
>  	if (error)
>  		return error;
>  
> -	le16_to_cpus(&range_y);
> +	data->max_y = get_unaligned_le16(&range_y);
>  
> +	/* read orientation config */
>  	error =  __mxt_read_reg(client,
>  				object->start_address + MXT_T100_CFG1,
>  				1, &cfg);
>  	if (error)
>  		return error;
>  
> +	data->xy_switch = cfg & MXT_T100_CFG_SWITCHXY;
> +
> +	/* allocate aux bytes */
>  	error =  __mxt_read_reg(client,
>  				object->start_address + MXT_T100_TCHAUX,
>  				1, &tchaux);
>  	if (error)
>  		return error;
>  
> -	/* Handle default values */
> -	if (range_x == 0)
> -		range_x = 1023;
> -
> -	if (range_y == 0)
> -		range_y = 1023;
> -
> -	if (cfg & MXT_T100_CFG_SWITCHXY) {
> -		data->max_x = range_y;
> -		data->max_y = range_x;
> -	} else {
> -		data->max_x = range_x;
> -		data->max_y = range_y;
> -	}
> -
> -	/* allocate aux bytes */
>  	aux = 6;
>  
>  	if (tchaux & MXT_T100_TCHAUX_VECT)
> @@ -1767,9 +1741,6 @@ static int mxt_read_t100_config(struct mxt_data *data)
>  		"T100 aux mappings vect:%u ampl:%u area:%u\n",
>  		data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);
>  
> -	dev_info(&client->dev,
> -		 "T100 Touchscreen size X%uY%u\n", data->max_x, data->max_y);
> -
>  	return 0;
>  }
>  
> @@ -1828,6 +1799,19 @@ static int mxt_initialize_input_device(struct mxt_data *data)
>  		return -EINVAL;
>  	}
>  
> +	/* Handle default values and orientation switch */
> +	if (data->max_x == 0)
> +		data->max_x = 1023;
> +
> +	if (data->max_y == 0)
> +		data->max_y = 1023;
> +
> +	if (data->xy_switch)
> +		swap(data->max_x, data->max_y);
> +
> +	dev_info(dev, "Touchscreen size X%uY%u\n", data->max_x, data->max_y);
> +
> +	/* Register input device */
>  	input_dev = input_allocate_device();
>  	if (!input_dev) {
>  		dev_err(dev, "Failed to allocate memory\n");
> -- 
> 2.5.0
> 

-- 
Dmitry