linux-kernel - Re: [PATCH v5 2/4] HID: lenovo: Prepare support for adding other devices

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Message-Id: <20140725145811.8fdbbced3de25c9f9e4ede00@ao2.it>
Date:	Fri, 25 Jul 2014 14:58:11 +0200
From:	Antonio Ospite <ao2@....it>
To:	Jamie Lentin <jm@...tin.co.uk>
Cc:	Jiri Kosina <jkosina@...e.cz>, Hans de Goede <hdegoede@...hat.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] HID: lenovo: Prepare support for adding other
 devices

On Wed, 23 Jul 2014 23:30:46 +0100
Jamie Lentin <jm@...tin.co.uk> wrote:

> Ensure all tpkbd specifics are within a postfixed function, the
> main functions for the driver should just switch to the appropriate
> function depending on product ID. Given this, we can add extra devices
> by including extra postfixed functions.
> 
> Signed-off-by: Jamie Lentin <jm@...tin.co.uk>
>

Reviewed-by: Antonio Ospite <ao2@....it>

> ---
>  drivers/hid/hid-lenovo.c | 53 ++++++++++++++++++++++++++++++++++++++++--------
>  1 file changed, 45 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
> index 0320b96..a56b9e7 100644
> --- a/drivers/hid/hid-lenovo.c
> +++ b/drivers/hid/hid-lenovo.c
> @@ -1,5 +1,6 @@
>  /*
> - *  HID driver for Lenovo ThinkPad USB Keyboard with TrackPoint
> + *  HID driver for Lenovo:
> + *  - ThinkPad USB Keyboard with TrackPoint (tpkbd)
>   *
>   *  Copyright (c) 2012 Bernhard Seibold
>   */
> @@ -39,7 +40,7 @@ static int lenovo_input_mapping_tpkbd(struct hid_device *hdev,
>  		struct hid_usage *usage, unsigned long **bit, int *max)
>  {
>  	if (usage->hid == (HID_UP_BUTTON | 0x0010)) {
> -		/* mark the device as pointer */
> +		/* This sub-device contains trackpoint, mark it */
>  		hid_set_drvdata(hdev, (void *)1);
>  		map_key_clear(KEY_MICMUTE);
>  		return 1;
> @@ -47,6 +48,19 @@ static int lenovo_input_mapping_tpkbd(struct hid_device *hdev,
>  	return 0;
>  }
>  
> +static int lenovo_input_mapping(struct hid_device *hdev,
> +		struct hid_input *hi, struct hid_field *field,
> +		struct hid_usage *usage, unsigned long **bit, int *max)
> +{
> +	switch (hdev->product) {
> +	case USB_DEVICE_ID_LENOVO_TPKBD:
> +		return lenovo_input_mapping_tpkbd(hdev, hi, field,
> +							usage, bit, max);
> +	default:
> +		return 0;
> +	}
> +}
> +
>  #undef map_key_clear
>  
>  static int lenovo_features_set_tpkbd(struct hid_device *hdev)
> @@ -337,6 +351,15 @@ static int lenovo_probe_tpkbd(struct hid_device *hdev)
>  	char *name_mute, *name_micmute;
>  	int i;
>  
> +	/*
> +	 * Only register extra settings against subdevice where input_mapping
> +	 * set drvdata to 1, i.e. the trackpoint.
> +	 */
> +	if (!hid_get_drvdata(hdev))
> +		return 0;
> +
> +	hid_set_drvdata(hdev, NULL);
> +
>  	/* Validate required reports. */
>  	for (i = 0; i < 4; i++) {
>  		if (!hid_validate_values(hdev, HID_FEATURE_REPORT, 4, i, 1))
> @@ -409,12 +432,16 @@ static int lenovo_probe(struct hid_device *hdev,
>  		goto err;
>  	}
>  
> -	if (hid_get_drvdata(hdev)) {
> -		hid_set_drvdata(hdev, NULL);
> +	switch (hdev->product) {
> +	case USB_DEVICE_ID_LENOVO_TPKBD:
>  		ret = lenovo_probe_tpkbd(hdev);
> -		if (ret)
> -			goto err_hid;
> +		break;
> +	default:
> +		ret = 0;
> +		break;
>  	}
> +	if (ret)
> +		goto err_hid;
>  
>  	return 0;
>  err_hid:
> @@ -427,6 +454,13 @@ static void lenovo_remove_tpkbd(struct hid_device *hdev)
>  {
>  	struct lenovo_drvdata_tpkbd *data_pointer = hid_get_drvdata(hdev);
>  
> +	/*
> +	 * Only the trackpoint half of the keyboard has drvdata and stuff that
> +	 * needs unregistering.
> +	 */
> +	if (data_pointer == NULL)
> +		return;
> +
>  	sysfs_remove_group(&hdev->dev.kobj,
>  			&lenovo_attr_group_tpkbd);
>  
> @@ -438,8 +472,11 @@ static void lenovo_remove_tpkbd(struct hid_device *hdev)
>  
>  static void lenovo_remove(struct hid_device *hdev)
>  {
> -	if (hid_get_drvdata(hdev))
> +	switch (hdev->product) {
> +	case USB_DEVICE_ID_LENOVO_TPKBD:
>  		lenovo_remove_tpkbd(hdev);
> +		break;
> +	}
>  
>  	hid_hw_stop(hdev);
>  }
> @@ -454,7 +491,7 @@ MODULE_DEVICE_TABLE(hid, lenovo_devices);
>  static struct hid_driver lenovo_driver = {
>  	.name = "lenovo",
>  	.id_table = lenovo_devices,
> -	.input_mapping = lenovo_input_mapping_tpkbd,
> +	.input_mapping = lenovo_input_mapping,
>  	.probe = lenovo_probe,
>  	.remove = lenovo_remove,
>  };
> -- 
> 2.0.0
> 
> 


-- 
Antonio Ospite
http://ao2.it

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?
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