linux-kernel - Re: [PATCH v3 01/13] HID: hid-input: export hidinput_calc_abs

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Date:	Tue, 13 Nov 2012 08:45:23 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/13] HID: hid-input: export hidinput_calc_abs_res

On Wed, 7 Nov 2012, Benjamin Tissoires wrote:

> Exporting the function allows us to calculate the resolution in third
> party drivers like hid-multitouch.
> This patch also complete the function with additional valid axes.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>

Acked-by: Jiri Kosina <jkosina@...e.cz>

> ---
>  drivers/hid/hid-input.c      | 9 ++++++++-
>  drivers/hid/hid-multitouch.c | 1 +
>  include/linux/hid.h          | 1 +
>  3 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 10248cf..f5b1d57 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -208,7 +208,7 @@ static int hidinput_setkeycode(struct input_dev *dev,
>   * Only exponent 1 length units are processed. Centimeters and inches are
>   * converted to millimeters. Degrees are converted to radians.
>   */
> -static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
> +__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
>  {
>  	__s32 unit_exponent = field->unit_exponent;
>  	__s32 logical_extents = field->logical_maximum -
> @@ -229,6 +229,12 @@ static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
>  	case ABS_X:
>  	case ABS_Y:
>  	case ABS_Z:
> +	case ABS_MT_POSITION_X:
> +	case ABS_MT_POSITION_Y:
> +	case ABS_MT_TOOL_X:
> +	case ABS_MT_TOOL_Y:
> +	case ABS_MT_TOUCH_MAJOR:
> +	case ABS_MT_TOUCH_MINOR:
>  		if (field->unit == 0x11) {		/* If centimeters */
>  			/* Convert to millimeters */
>  			unit_exponent += 1;
> @@ -283,6 +289,7 @@ static __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code)
>  	/* Calculate resolution */
>  	return logical_extents / physical_extents;
>  }
> +EXPORT_SYMBOL_GPL(hidinput_calc_abs_res);
>  
>  #ifdef CONFIG_HID_BATTERY_STRENGTH
>  static enum power_supply_property hidinput_battery_props[] = {
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 3eb02b9..9f64e36 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -298,6 +298,7 @@ static void set_abs(struct input_dev *input, unsigned int code,
>  	int fmax = field->logical_maximum;
>  	int fuzz = snratio ? (fmax - fmin) / snratio : 0;
>  	input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
> +	input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
>  }
>  
>  static void mt_store_field(struct hid_usage *usage, struct mt_device *td,
> diff --git a/include/linux/hid.h b/include/linux/hid.h
> index 7e1f37d..9edb06c 100644
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -743,6 +743,7 @@ int hid_input_report(struct hid_device *, int type, u8 *, int, int);
>  int hidinput_find_field(struct hid_device *hid, unsigned int type, unsigned int code, struct hid_field **field);
>  struct hid_field *hidinput_get_led_field(struct hid_device *hid);
>  unsigned int hidinput_count_leds(struct hid_device *hid);
> +__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code);
>  void hid_output_report(struct hid_report *report, __u8 *data);
>  struct hid_device *hid_allocate_device(void);
>  struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
> -- 
> 1.7.11.7
> 

-- 
Jiri Kosina
SUSE Labs
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