[PATCH v2 1/3] HID: logitech-hidpp: Add more debug statements

[PATCH v2 1/3] HID: logitech-hidpp: Add more debug statements

[Bastien Nocera]

This should help us figure out some hairy problems with some devices.

Signed-off-by: Bastien Nocera <hadess@hadess.net>
---

Fixed kernel test bot warning:
   drivers/hid/hid-logitech-hidpp.c: In function 'hidpp_send_fap_command_sync':
>> drivers/hid/hid-logitech-hidpp.c:343:25: warning: format '%ld' expects argument of type 'long int', but argument 5 has type 'unsigned int' [-Wformat=]
     343 |                         "Invalid number of parameters passed to command (%d != %ld)\n",
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 drivers/hid/hid-logitech-hidpp.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index f44ba7be3cc5..1952d8d3b6b2 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -338,8 +338,13 @@ static int hidpp_send_fap_command_sync(struct hidpp_device *hidpp,
 	struct hidpp_report *message;
 	int ret;
 
-	if (param_count > sizeof(message->fap.params))
+	if (param_count > sizeof(message->fap.params)) {
+		hid_dbg(hidpp->hid_dev,
+			"Invalid number of parameters passed to command (%d != %llu)\n",
+			param_count,
+			(unsigned long long) sizeof(message->fap.params));
 		return -EINVAL;
+	}
 
 	message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
 	if (!message)
@@ -3440,11 +3445,17 @@ static int hi_res_scroll_enable(struct hidpp_device *hidpp)
 		ret = hidpp10_enable_scrolling_acceleration(hidpp);
 		multiplier = 8;
 	}
-	if (ret)
+	if (ret) {
+		hid_dbg(hidpp->hid_dev,
+			"Could not enable hi-res scrolling: %d\n", ret);
 		return ret;
+	}
 
-	if (multiplier == 0)
+	if (multiplier == 0) {
+		hid_dbg(hidpp->hid_dev,
+			"Invalid multiplier 0 from device, setting it to 1\n");
 		multiplier = 1;
+	}
 
 	hidpp->vertical_wheel_counter.wheel_multiplier = multiplier;
 	hid_dbg(hidpp->hid_dev, "wheel multiplier = %d\n", multiplier);
-- 
2.39.1

[PATCH v2 2/3] HID: logitech-hidpp: Retry commands when device is busy

[Bastien Nocera]

Handle the busy error coming from the device or receiver. The
documentation says a busy error can be returned when:
"
Device (or receiver) cannot answer immediately to this request
for any reason i.e:
- already processing a request from the same or another SW
- pipe full
"

Signed-off-by: Bastien Nocera <hadess@hadess.net>
---

Same as v1

 drivers/hid/hid-logitech-hidpp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 1952d8d3b6b2..9e94026de437 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -295,6 +295,7 @@ static int hidpp_send_message_sync(struct hidpp_device *hidpp,
 	 */
 	*response = *message;
 
+retry:
 	ret = __hidpp_send_report(hidpp->hid_dev, message);
 
 	if (ret) {
@@ -321,6 +322,10 @@ static int hidpp_send_message_sync(struct hidpp_device *hidpp,
 			response->report_id == REPORT_ID_HIDPP_VERY_LONG) &&
 			response->fap.feature_index == HIDPP20_ERROR) {
 		ret = response->fap.params[1];
+		if (ret == HIDPP20_ERROR_BUSY) {
+			dbg_hid("%s:got busy hidpp 2.0 error %02X, retrying\n", __func__, ret);
+			goto retry;
+		}
 		dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
 		goto exit;
 	}
-- 
2.39.1

[PATCH v2 3/3] HID: logitech-hidpp: Add myself to authors

[Bastien Nocera]

Signed-off-by: Bastien Nocera <hadess@hadess.net>
---

Same as v1

 drivers/hid/hid-logitech-hidpp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 9e94026de437..03b77ca03081 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -30,6 +30,7 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
 MODULE_AUTHOR("Nestor Lopez Casado <nlopezcasad@logitech.com>");
+MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
 
 static bool disable_tap_to_click;
 module_param(disable_tap_to_click, bool, 0644);
-- 
2.39.1

Re: [PATCH v2 2/3] HID: logitech-hidpp: Retry commands when device is busy

[Benjamin Tissoires]

On Feb 06 2023, Bastien Nocera wrote:
> Handle the busy error coming from the device or receiver. The
> documentation says a busy error can be returned when:
> "
> Device (or receiver) cannot answer immediately to this request
> for any reason i.e:
> - already processing a request from the same or another SW
> - pipe full
> "
> 
> Signed-off-by: Bastien Nocera <hadess@hadess.net>
> ---
> 
> Same as v1
> 
>  drivers/hid/hid-logitech-hidpp.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> index 1952d8d3b6b2..9e94026de437 100644
> --- a/drivers/hid/hid-logitech-hidpp.c
> +++ b/drivers/hid/hid-logitech-hidpp.c
> @@ -295,6 +295,7 @@ static int hidpp_send_message_sync(struct hidpp_device *hidpp,
>  	 */
>  	*response = *message;
>  
> +retry:
>  	ret = __hidpp_send_report(hidpp->hid_dev, message);
>  
>  	if (ret) {
> @@ -321,6 +322,10 @@ static int hidpp_send_message_sync(struct hidpp_device *hidpp,
>  			response->report_id == REPORT_ID_HIDPP_VERY_LONG) &&
>  			response->fap.feature_index == HIDPP20_ERROR) {
>  		ret = response->fap.params[1];
> +		if (ret == HIDPP20_ERROR_BUSY) {
> +			dbg_hid("%s:got busy hidpp 2.0 error %02X, retrying\n", __func__, ret);
> +			goto retry;

I must confess, I blocked a little bit there to decide whether or not
using goto here was OK.

But then I reliazed that there is no way to leave that function if the
device is buggy and constantly sends back ERROR_BUSY. So I am not very
found of the idea of having that got after all.

Would you mind respinning that patch with a bounded loop for the retries
instead of using a goto? I'd like the driver to give up after a few
retries if the device is not fair.

Cheers,
Benjamin

> +		}
>  		dbg_hid("%s:got hidpp 2.0 error %02X\n", __func__, ret);
>  		goto exit;
>  	}
> -- 
> 2.39.1
> 

Re: [PATCH v2 3/3] HID: logitech-hidpp: Add myself to authors

[Benjamin Tissoires]

On Feb 06 2023, Bastien Nocera wrote:
> Signed-off-by: Bastien Nocera <hadess@hadess.net>
> ---
> 
> Same as v1
> 
>  drivers/hid/hid-logitech-hidpp.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> index 9e94026de437..03b77ca03081 100644
> --- a/drivers/hid/hid-logitech-hidpp.c
> +++ b/drivers/hid/hid-logitech-hidpp.c
> @@ -30,6 +30,7 @@
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
>  MODULE_AUTHOR("Nestor Lopez Casado <nlopezcasad@logitech.com>");
> +MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");

Just FTR, I have asked Bastien to set himself as an author given all of
the work he has been doing on this and to have one more person to be the
go-to person from folks having an issue.

And Bastien, would you mind adding yourself to the MAINTAINERS file too?
This way you'll get Cc-ed when people submit patches.

Cheers,
Benjamin

>  
>  static bool disable_tap_to_click;
>  module_param(disable_tap_to_click, bool, 0644);
> -- 
> 2.39.1
> 

Re: [PATCH v2 1/3] HID: logitech-hidpp: Add more debug statements

[Benjamin Tissoires]

On Feb 06 2023, Bastien Nocera wrote:
> This should help us figure out some hairy problems with some devices.
> 
> Signed-off-by: Bastien Nocera <hadess@hadess.net>

FWIW, I am currently testing this patch and will probably push it today.

Cheers,
Benjamin

> ---
> 
> Fixed kernel test bot warning:
>    drivers/hid/hid-logitech-hidpp.c: In function 'hidpp_send_fap_command_sync':
> >> drivers/hid/hid-logitech-hidpp.c:343:25: warning: format '%ld' expects argument of type 'long int', but argument 5 has type 'unsigned int' [-Wformat=]
>      343 |                         "Invalid number of parameters passed to command (%d != %ld)\n",
>          |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
>  drivers/hid/hid-logitech-hidpp.c | 17 ++++++++++++++---
>  1 file changed, 14 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> index f44ba7be3cc5..1952d8d3b6b2 100644
> --- a/drivers/hid/hid-logitech-hidpp.c
> +++ b/drivers/hid/hid-logitech-hidpp.c
> @@ -338,8 +338,13 @@ static int hidpp_send_fap_command_sync(struct hidpp_device *hidpp,
>  	struct hidpp_report *message;
>  	int ret;
>  
> -	if (param_count > sizeof(message->fap.params))
> +	if (param_count > sizeof(message->fap.params)) {
> +		hid_dbg(hidpp->hid_dev,
> +			"Invalid number of parameters passed to command (%d != %llu)\n",
> +			param_count,
> +			(unsigned long long) sizeof(message->fap.params));
>  		return -EINVAL;
> +	}
>  
>  	message = kzalloc(sizeof(struct hidpp_report), GFP_KERNEL);
>  	if (!message)
> @@ -3440,11 +3445,17 @@ static int hi_res_scroll_enable(struct hidpp_device *hidpp)
>  		ret = hidpp10_enable_scrolling_acceleration(hidpp);
>  		multiplier = 8;
>  	}
> -	if (ret)
> +	if (ret) {
> +		hid_dbg(hidpp->hid_dev,
> +			"Could not enable hi-res scrolling: %d\n", ret);
>  		return ret;
> +	}
>  
> -	if (multiplier == 0)
> +	if (multiplier == 0) {
> +		hid_dbg(hidpp->hid_dev,
> +			"Invalid multiplier 0 from device, setting it to 1\n");
>  		multiplier = 1;
> +	}
>  
>  	hidpp->vertical_wheel_counter.wheel_multiplier = multiplier;
>  	hid_dbg(hidpp->hid_dev, "wheel multiplier = %d\n", multiplier);
> -- 
> 2.39.1
> 

Re: (subset) [PATCH v2 1/3] HID: logitech-hidpp: Add more debug statements

[Benjamin Tissoires]

On Mon, 06 Feb 2023 23:12:54 +0100, Bastien Nocera wrote:
> This should help us figure out some hairy problems with some devices.
> 
> 

Applied to hid/hid.git (for-6.3/logitech), thanks!

[1/3] HID: logitech-hidpp: Add more debug statements
      https://git.kernel.org/hid/hid/c/db5167cfaa0a

Cheers,
-- 
Benjamin Tissoires <benjamin.tissoires@redhat.com>

Re: [PATCH v2 3/3] HID: logitech-hidpp: Add myself to authors

[Bastien Nocera]

On Thu, 2023-02-09 at 15:53 +0100, Benjamin Tissoires wrote:
> On Feb 06 2023, Bastien Nocera wrote:
> > Signed-off-by: Bastien Nocera <hadess@hadess.net>
> > ---
> > 
> > Same as v1
> > 
> >  drivers/hid/hid-logitech-hidpp.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-
> > logitech-hidpp.c
> > index 9e94026de437..03b77ca03081 100644
> > --- a/drivers/hid/hid-logitech-hidpp.c
> > +++ b/drivers/hid/hid-logitech-hidpp.c
> > @@ -30,6 +30,7 @@
> >  MODULE_LICENSE("GPL");
> >  MODULE_AUTHOR("Benjamin Tissoires
> > <benjamin.tissoires@gmail.com>");
> >  MODULE_AUTHOR("Nestor Lopez Casado <nlopezcasad@logitech.com>");
> > +MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
> 
> Just FTR, I have asked Bastien to set himself as an author given all
> of
> the work he has been doing on this and to have one more person to be
> the
> go-to person from folks having an issue.
> 
> And Bastien, would you mind adding yourself to the MAINTAINERS file
> too?
> This way you'll get Cc-ed when people submit patches.

Done in v3 specifically for the hidpp file.

Re: [PATCH v2 2/3] HID: logitech-hidpp: Retry commands when device is busy

[Bastien Nocera]

On Thu, 2023-02-09 at 15:50 +0100, Benjamin Tissoires wrote:
> On Feb 06 2023, Bastien Nocera wrote:
> > Handle the busy error coming from the device or receiver. The
> > documentation says a busy error can be returned when:
> > "
> > Device (or receiver) cannot answer immediately to this request
> > for any reason i.e:
> > - already processing a request from the same or another SW
> > - pipe full
> > "
> > 
> > Signed-off-by: Bastien Nocera <hadess@hadess.net>
> > ---
> > 
> > Same as v1
> > 
> >  drivers/hid/hid-logitech-hidpp.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-
> > logitech-hidpp.c
> > index 1952d8d3b6b2..9e94026de437 100644
> > --- a/drivers/hid/hid-logitech-hidpp.c
> > +++ b/drivers/hid/hid-logitech-hidpp.c
> > @@ -295,6 +295,7 @@ static int hidpp_send_message_sync(struct
> > hidpp_device *hidpp,
> >          */
> >         *response = *message;
> >  
> > +retry:
> >         ret = __hidpp_send_report(hidpp->hid_dev, message);
> >  
> >         if (ret) {
> > @@ -321,6 +322,10 @@ static int hidpp_send_message_sync(struct
> > hidpp_device *hidpp,
> >                         response->report_id ==
> > REPORT_ID_HIDPP_VERY_LONG) &&
> >                         response->fap.feature_index ==
> > HIDPP20_ERROR) {
> >                 ret = response->fap.params[1];
> > +               if (ret == HIDPP20_ERROR_BUSY) {
> > +                       dbg_hid("%s:got busy hidpp 2.0 error %02X,
> > retrying\n", __func__, ret);
> > +                       goto retry;
> 
> I must confess, I blocked a little bit there to decide whether or not
> using goto here was OK.
> 
> But then I reliazed that there is no way to leave that function if
> the
> device is buggy and constantly sends back ERROR_BUSY. So I am not
> very
> found of the idea of having that got after all.
> 
> Would you mind respinning that patch with a bounded loop for the
> retries
> instead of using a goto? I'd like the driver to give up after a few
> retries if the device is not fair.

Done in v3.