linux-kernel - Re: [RFC v3 4/5] hid-multitouch: added support for Cypress TrueTouch panels

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Message-ID: <20110107200014.GC29913@polaris.bitmath.org>
Date:	Fri, 7 Jan 2011 21:00:14 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...c.fr>
Cc:	Stephane Chatty <chatty@...c.fr>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC v3 4/5] hid-multitouch: added support for Cypress TrueTouch
 panels

On Fri, Jan 07, 2011 at 07:42:41PM +0100, Benjamin Tissoires wrote:
> Added support for Cypress TrueTouch panels, which detect up to 10 fingers
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...c.fr>
> Signed-off-by: Stéphane Chatty <chatty@...c.fr>
> ---

Hi, just minor things.

>  drivers/hid/Kconfig          |    1 +
>  drivers/hid/hid-core.c       |    1 +
>  drivers/hid/hid-ids.h        |    1 +
>  drivers/hid/hid-multitouch.c |   19 +++++++++++++++++++
>  4 files changed, 22 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> index 511554d..de31d75 100644
> --- a/drivers/hid/Kconfig
> +++ b/drivers/hid/Kconfig
> @@ -293,6 +293,7 @@ config HID_MULTITOUCH
>  
>  	  Say Y here if you have one of the following devices:
>  	  - PixCir touchscreen
> +	  - Cypress TrueTouch
>  
>  config HID_NTRIG
>  	tristate "N-Trig touch screen"
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index 2b4d9b9..e6a86bf 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -1298,6 +1298,7 @@ static const struct hid_device_id hid_blacklist[] = {
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE) },
> +	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_DRAGONRISE, 0x0006) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
>  	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 17b444b..c258c42 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -180,6 +180,7 @@
>  #define USB_DEVICE_ID_CYPRESS_BARCODE_1	0xde61
>  #define USB_DEVICE_ID_CYPRESS_BARCODE_2	0xde64
>  #define USB_DEVICE_ID_CYPRESS_BARCODE_3	0xbca1
> +#define USB_DEVICE_ID_CYPRESS_TRUETOUCH	0xc001
>  
>  #define USB_VENDOR_ID_DEALEXTREAME	0x10c5
>  #define USB_DEVICE_ID_DEALEXTREAME_RADIO_SI4701	0x819a
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 3b05dfe..7af9f71 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -32,6 +32,7 @@ MODULE_LICENSE("GPL");
>  /* quirks to control the device */
>  #define MT_QUIRK_NOT_SEEN_MEANS_UP	(1 << 0)
>  #define MT_QUIRK_SLOT_IS_CONTACTID	(1 << 1)
> +#define MT_QUIRK_CYPRESS	(1 << 2)

Missing tab.

>  
>  struct mt_slot {
>  	__s32 x, y, p, w, h;
> @@ -62,6 +63,7 @@ struct mt_class {
>  /* classes of device behavior */
>  #define MT_CLS_DEFAULT 0
>  #define MT_CLS_DUAL1 1
> +#define MT_CLS_CYPRESS 2

Missing tabs... goes for the previous patch as well, coming to think of it.

It does seem slightly complicated, doesn't it. How about dropping
these, and referring to explicit static structures instead?

>  
>  /*
>   * these device-dependent functions determine what slot corresponds
> @@ -73,6 +75,14 @@ static int slot_is_contactid(struct mt_device *td)
>  	return td->curdata.contactid;
>  }
>  
> +static int cypress_compute_slot(struct mt_device *td)
> +{
> +	if (td->curdata.contactid != 0 || td->num_received == 0)
> +		return td->curdata.contactid;
> +	else
> +		return -1;
> +}
> +
>  static int find_slot_from_contactid(struct mt_device *td)
>  {
>  	int i;
> @@ -95,6 +105,7 @@ static int find_slot_from_contactid(struct mt_device *td)
>  struct mt_class mt_classes[] = {
>  	{ 0, 0, 0, 10 },                             /* MT_CLS_DEFAULT */
>  	{ MT_QUIRK_SLOT_IS_CONTACTID, 0, 0, 2 },     /* MT_CLS_DUAL1 */
> +	{ MT_QUIRK_CYPRESS | MT_QUIRK_NOT_SEEN_MEANS_UP, 0, 0, 10 }, /* MT_CLS_CYPRESS */
>  };

These could be named structs instead of an array, e.g.,

static const struct mt_class mt_cls_dual1 = {
       .quirks = MT_QUIRK_SLOT_IS_CONTACTID,
       .max_contacts = 2,
};

>  
>  static void mt_feature_mapping(struct hid_device *hdev, struct hid_input *hi,
> @@ -223,6 +234,9 @@ static int mt_compute_slot(struct mt_device *td)
>  	if (cls->quirks & MT_QUIRK_SLOT_IS_CONTACTID)
>  		return slot_is_contactid(td);
>  
> +	if (cls->quirks & MT_QUIRK_CYPRESS)
> +		return cypress_compute_slot(td);
> +
>  	return find_slot_from_contactid(td);
>  }
>  
> @@ -422,6 +436,11 @@ static void mt_remove(struct hid_device *hdev)
>  
>  static const struct hid_device_id mt_devices[] = {
>  
> +	/* Cypress panel */
> +	{ .driver_data = MT_CLS_CYPRESS,
> +		HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
> +			USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
> +
>  	/* PixCir-based panels */
>  	{ .driver_data = MT_CLS_DUAL1,
>  		HID_USB_DEVICE(USB_VENDOR_ID_HANVON,

Could use pointers here instead.

Thanks!
Henrik
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