From: Dmitry Torokhov <dmitry.torokhov@gmail.com> To: "Samuel Thibault" <samuel.thibault@ens-lyon.org>, "Pavel Machek" <pavel@ucw.cz>, "Pali Rohár" <pali.rohar@gmail.com>, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, rpurdie@rpsys.net, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org> Subject: Re: [PATCH 1/3] Input: export LEDs as class devices in sysfs Date: Tue, 9 Jun 2015 10:32:03 -0700 [thread overview] Message-ID: <20150609173203.GG6338@dtor-ws> (raw) In-Reply-To: <20150609172231.GB4336@type.youpi.perso.aquilenet.fr> On Tue, Jun 09, 2015 at 07:22:31PM +0200, Samuel Thibault wrote: > Dmitry Torokhov, le Tue 09 Jun 2015 09:49:35 -0700, a écrit : > > > > + [LED_NUML] = { "num-lock", VT_TRIGGER("kbd-numlock") }, > > > > + [LED_CAPSL] = { "caps-lock", VT_TRIGGER("kbd-capslock") }, > > > > + [LED_SCROLLL] = { "scroll-lock", VT_TRIGGER("kbd-scrollock") }, > > > > > > I'd tend to think we'd want to harmonize the user-visible LED names and > > > kbd trigger names, i.e. use "numlock", "capslock" and "scrollock" in > > > both case (or something else, but the same for LED and trigger). In my > > > patch I simply used the corresponding LED or kbd macro names, but there > > > is probably no strong reason to this, while there is probably a good > > > reason to choose coherent and nice user-visible names. > > > > I can do either "num_lock - kbd-num-lock" or "numlock - kbd-numlock" > > with slight preference to the 1st. What is your preference? > > I'd prefer numlock - kbd-numlock. OK. > > > > > +static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev) > > > > +{ > > > > + struct input_led *led = container_of(cdev, struct input_led, cdev); > > > > + struct input_dev *input = led->handle->dev; > > > > + > > > > + return test_bit(led->code, input->ledbit) ? LED_FULL : LED_OFF; > > > > > > This always returns LED_FULL, whatever the current state of the LED, is > > > that really what we want? Userspace will be surprised to read 255 from > > > sysfs whatever it writes to it (with actual proper effect on the LED). > > > > Right, I will change it to 0 and led->max_brightness (which I will set > > to 1). > > Well, that won't fix the issue I'm having, see below. > > > > Simply not defining input_leds_brightness_get and letting the LED core > > > manage the value does get a proper "brightness" sysfs file behavior, is > > > there a reason not to do that? > > > > Yes, we want LED sysfs show correct result if state is altered via > > EV_LED/LED_* event. Basically the led bit state is the source of truth > > here. > > Ok, I understand that. But it happens that your code does not work! It > is always 255 (or will be 1 with the modifications you mention above). > input->ledbit is whether the LED exists or not, not its state, right? > Did your perhaps mean input->led in input_leds_brightness_get instead of > input->ledbit? Yep. I'll change it. -- Dmitry
WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Torokhov <dmitry.torokhov@gmail.com> To: "Samuel Thibault" <samuel.thibault@ens-lyon.org>, "Pavel Machek" <pavel@ucw.cz>, "Pali Rohár" <pali.rohar@gmail.com>, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, rpurdie@rpsys.net, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org> Subject: Re: [PATCH 1/3] Input: export LEDs as class devices in sysfs Date: Tue, 9 Jun 2015 10:32:03 -0700 [thread overview] Message-ID: <20150609173203.GG6338@dtor-ws> (raw) In-Reply-To: <20150609172231.GB4336@type.youpi.perso.aquilenet.fr> On Tue, Jun 09, 2015 at 07:22:31PM +0200, Samuel Thibault wrote: > Dmitry Torokhov, le Tue 09 Jun 2015 09:49:35 -0700, a écrit : > > > > + [LED_NUML] = { "num-lock", VT_TRIGGER("kbd-numlock") }, > > > > + [LED_CAPSL] = { "caps-lock", VT_TRIGGER("kbd-capslock") }, > > > > + [LED_SCROLLL] = { "scroll-lock", VT_TRIGGER("kbd-scrollock") }, > > > > > > I'd tend to think we'd want to harmonize the user-visible LED names and > > > kbd trigger names, i.e. use "numlock", "capslock" and "scrollock" in > > > both case (or something else, but the same for LED and trigger). In my > > > patch I simply used the corresponding LED or kbd macro names, but there > > > is probably no strong reason to this, while there is probably a good > > > reason to choose coherent and nice user-visible names. > > > > I can do either "num_lock - kbd-num-lock" or "numlock - kbd-numlock" > > with slight preference to the 1st. What is your preference? > > I'd prefer numlock - kbd-numlock. OK. > > > > > +static enum led_brightness input_leds_brightness_get(struct led_classdev *cdev) > > > > +{ > > > > + struct input_led *led = container_of(cdev, struct input_led, cdev); > > > > + struct input_dev *input = led->handle->dev; > > > > + > > > > + return test_bit(led->code, input->ledbit) ? LED_FULL : LED_OFF; > > > > > > This always returns LED_FULL, whatever the current state of the LED, is > > > that really what we want? Userspace will be surprised to read 255 from > > > sysfs whatever it writes to it (with actual proper effect on the LED). > > > > Right, I will change it to 0 and led->max_brightness (which I will set > > to 1). > > Well, that won't fix the issue I'm having, see below. > > > > Simply not defining input_leds_brightness_get and letting the LED core > > > manage the value does get a proper "brightness" sysfs file behavior, is > > > there a reason not to do that? > > > > Yes, we want LED sysfs show correct result if state is altered via > > EV_LED/LED_* event. Basically the led bit state is the source of truth > > here. > > Ok, I understand that. But it happens that your code does not work! It > is always 255 (or will be 1 with the modifications you mention above). > input->ledbit is whether the LED exists or not, not its state, right? > Did your perhaps mean input->led in input_leds_brightness_get instead of > input->ledbit? Yep. I'll change it. -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2015-06-09 17:33 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-06-08 21:43 [PATCH 0/3] Switch input leds over to standard LED class devices Dmitry Torokhov 2015-06-08 21:43 ` [PATCH 1/3] Input: export LEDs as class devices in sysfs Dmitry Torokhov 2015-06-09 13:19 ` Samuel Thibault 2015-06-09 13:19 ` Samuel Thibault 2015-06-09 13:27 ` Samuel Thibault 2015-06-09 13:27 ` Samuel Thibault 2015-06-09 16:50 ` Dmitry Torokhov 2015-06-09 16:50 ` Dmitry Torokhov 2015-06-09 17:16 ` Samuel Thibault 2015-06-09 17:16 ` Samuel Thibault 2015-06-09 16:49 ` Dmitry Torokhov 2015-06-09 16:49 ` Dmitry Torokhov 2015-06-09 17:22 ` Samuel Thibault 2015-06-09 17:22 ` Samuel Thibault 2015-06-09 17:32 ` Dmitry Torokhov [this message] 2015-06-09 17:32 ` Dmitry Torokhov 2015-06-10 6:34 ` Pavel Machek 2015-06-10 6:34 ` Pavel Machek 2015-06-09 17:42 ` [PATCH v2 " Dmitry Torokhov 2015-06-10 0:32 ` Samuel Thibault 2015-06-10 1:24 ` Dmitry Torokhov 2015-06-11 17:51 ` Pavel Machek 2015-06-15 10:03 ` Pavel Machek 2015-06-15 10:51 ` Pali Rohár 2015-07-21 11:14 ` Vlastimil Babka 2015-07-21 17:01 ` Dmitry Torokhov 2015-07-21 21:08 ` Pavel Machek 2015-07-22 13:12 ` Vlastimil Babka 2015-07-22 18:55 ` Jiri Kosina 2015-07-23 5:19 ` Vlastimil Babka 2015-07-23 5:42 ` Jiri Kosina 2015-07-22 14:41 ` Vlastimil Babka 2015-07-22 19:49 ` Jiri Kosina 2015-07-22 21:47 ` Pavel Machek 2015-07-22 21:50 ` Jiri Kosina 2015-07-22 21:49 ` Dmitry Torokhov 2015-07-22 22:01 ` Jiri Kosina 2015-06-08 21:43 ` [PATCH 2/3] tty/vt/keyboard: define LED triggers for VT LED states Dmitry Torokhov 2015-06-08 21:43 ` [PATCH 3/3] tty/vt/keyboard: define LED triggers for VT keyboard lock states Dmitry Torokhov 2015-06-08 22:58 ` [PATCH 0/3] Switch input leds over to standard LED class devices Bastien Nocera 2015-06-08 23:16 ` Dmitry Torokhov 2015-06-09 10:54 ` Pavel Machek 2015-06-09 11:12 ` Pavel Machek 2015-06-09 11:22 ` Pali Rohár 2015-06-09 11:22 ` Pali Rohár 2015-06-09 11:28 ` Pavel Machek 2015-06-09 11:28 ` Pavel Machek 2015-06-09 12:22 ` Samuel Thibault 2015-06-09 12:22 ` Samuel Thibault 2015-06-09 11:26 ` Pavel Machek 2015-06-09 16:40 ` Dmitry Torokhov 2015-06-09 12:20 ` Samuel Thibault 2015-06-09 12:20 ` Samuel Thibault 2015-06-09 16:18 ` Pavel Machek 2015-06-09 16:32 ` Dmitry Torokhov 2015-06-09 16:37 ` Dmitry Torokhov 2015-06-09 13:42 ` Samuel Thibault 2015-06-09 13:42 ` Samuel Thibault 2015-06-09 13:50 ` Pali Rohár 2015-06-09 13:50 ` Pali Rohár 2015-06-09 14:05 ` Samuel Thibault [not found] ` <20090205113908.GA14224@const.inria.fr> 2015-06-09 14:17 ` caps lock led does not show up Samuel Thibault 2015-06-09 14:17 ` Samuel Thibault 2015-06-09 16:03 ` Bug#514464: " Anton Zinoviev 2015-06-09 16:03 ` Anton Zinoviev 2015-06-11 8:08 ` Samuel Thibault 2015-06-11 8:08 ` Samuel Thibault 2015-06-11 14:28 ` Samuel Thibault 2015-06-11 14:28 ` Samuel Thibault 2015-06-11 15:37 ` Samuel Thibault 2015-06-25 15:41 ` Samuel Thibault 2015-07-02 16:39 ` Anton Zinoviev 2015-07-02 16:50 ` Samuel Thibault 2015-08-31 8:33 ` Samuel Thibault
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