linux-kernel - Re: [PATCH v2 1/5] HID: steelseries: preparation for adding SteelSeries Arctis 9 support

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Message-ID: <d31906c2-a9d4-4907-ae1b-bea0520adbe2@wanadoo.fr>
Date: Sun, 12 Jan 2025 13:02:42 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Christian Mayer <git@...er-bgk.de>, linux-input@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
 Benjamin Tissoires <benjamin.tissoires@...hat.com>,
 Bastien Nocera <hadess@...ess.net>
Subject: Re: [PATCH v2 1/5] HID: steelseries: preparation for adding
 SteelSeries Arctis 9 support

Le 12/01/2025 à 12:44, Christian Mayer a écrit :
> Refactor code and add calls to hid_hw_open/hid_hw_closed in preparation
> for adding support for the SteelSeries Arctis 9 headset.
> 
> Signed-off-by: Christian Mayer <git@...er-bgk.de>
> ---
>   drivers/hid/hid-steelseries.c | 19 +++++++++++++------
>   1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/hid/hid-steelseries.c b/drivers/hid/hid-steelseries.c
> index f9ff5be94309..dc4ab55d7c22 100644
> --- a/drivers/hid/hid-steelseries.c
> +++ b/drivers/hid/hid-steelseries.c
> @@ -377,20 +377,21 @@ static void steelseries_srws1_remove(struct hid_device *hdev)
>   #define ARCTIS_1_BATTERY_RESPONSE_LEN		8
>   static const char arctis_1_battery_request[] = { 0x06, 0x12 };
>   
> -static int steelseries_headset_arctis_1_fetch_battery(struct hid_device *hdev)
> +static int steelseries_headset_request_battery(struct hid_device *hdev,
> +	const char *request, size_t len)
>   {
>   	u8 *write_buf;
>   	int ret;
>   
>   	/* Request battery information */
> -	write_buf = kmemdup(arctis_1_battery_request, sizeof(arctis_1_battery_request), GFP_KERNEL);
> +	write_buf = kmemdup(request, len, GFP_KERNEL);
>   	if (!write_buf)
>   		return -ENOMEM;
>   
> -	ret = hid_hw_raw_request(hdev, arctis_1_battery_request[0],
> -				 write_buf, sizeof(arctis_1_battery_request),
> +	hid_dbg(hdev, "Sending battery request report");
> +	ret = hid_hw_raw_request(hdev, request[0], write_buf, len,
>   				 HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
> -	if (ret < (int)sizeof(arctis_1_battery_request)) {
> +	if (ret < (int)len) {
>   		hid_err(hdev, "hid_hw_raw_request() failed with %d\n", ret);
>   		ret = -ENODATA;
>   	}
> @@ -404,7 +405,8 @@ static void steelseries_headset_fetch_battery(struct hid_device *hdev)
>   	int ret = 0;
>   
>   	if (sd->quirks & STEELSERIES_ARCTIS_1)
> -		ret = steelseries_headset_arctis_1_fetch_battery(hdev);
> +		ret = steelseries_headset_request_battery(hdev,
> +			arctis_1_battery_request, sizeof(arctis_1_battery_request));
>   
>   	if (ret < 0)
>   		hid_dbg(hdev,
> @@ -554,6 +556,10 @@ static int steelseries_probe(struct hid_device *hdev, const struct hid_device_id
>   	if (ret)
>   		return ret;
>   
> +	ret = hid_hw_open(hdev);
> +	if (ret)
> +		return ret;

Should we call hid_hw_stop() if steelseries_headset_battery_register() 
below fails, as done in the remove funcion?

> +
>   	if (steelseries_headset_battery_register(sd) < 0)
>   		hid_err(sd->hdev,
>   			"Failed to register battery for headset\n");
> @@ -580,6 +586,7 @@ static void steelseries_remove(struct hid_device *hdev)
>   
>   	cancel_delayed_work_sync(&sd->battery_work);
>   
> +	hid_hw_close(hdev);
>   	hid_hw_stop(hdev);
>   }
>