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From: Hans de Goede <hdegoede@redhat.com>
To: Andrzej Pietrasiewicz <andrzej.p@collabora.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org, linux-acpi@vger.kernel.org,
	linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org,
	patches@opensource.cirrus.com,
	ibm-acpi-devel@lists.sourceforge.net,
	platform-driver-x86@vger.kernel.org,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Jonathan Cameron <jic23@kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Kukjin Kim <kgene@kernel.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>,
	Vladimir Zapolskiy <vz@mleia.com>,
	Sylvain Lemieux <slemieux.tyco@gmail.com>,
	Laxman Dewangan <ldewangan@nvidia.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Barry Song <baohua@kernel.org>,
	Michael Hennerich <michael.hennerich@analog.com>,
	Nick Dyer <nick@shmanahar.org>, Ferruh Yigit <fery@cypress.com>,
	Sangwon Jee <jeesw@melfas.com>,
	Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>,
	kernel@collabora.com, Peter Hutterer <peter.hutterer@redhat.com>,
	Benjamin Tissoires <btissoir@redhat.com>
Subject: Re: [PATCHv2 0/7] Support inhibiting input devices
Date: Wed, 3 Jun 2020 21:37:10 +0200
Message-ID: <01b902dd-8841-e697-5ba7-96fa6b73c1cd@redhat.com> (raw)
In-Reply-To: <025361f4-5b1b-6669-ffa0-a6e8ad43940c@collabora.com>

Hi,

On 6/3/20 7:54 PM, Andrzej Pietrasiewicz wrote:
> W dniu 03.06.2020 o 19:38, Hans de Goede pisze:
>> Hi,
>>
>> On 6/3/20 3:07 PM, Andrzej Pietrasiewicz wrote:
>>> Hi Hans, hi Dmitry,
>>
>> <snip>
>>
>>> I'm taking one step back and looking at the ->open() and ->close()
>>> driver callbacks. They are called from input_open_device() and
>>> input_close_device(), respectively:
>>>
>>> input_open_device():
>>> "This function should be called by input handlers when they
>>> want to start receive events from given input device."
>>>
>>> ->open() callback:
>>> "this method is called when the very first user calls
>>> input_open_device(). The driver must prepare the device to start
>>> generating events (start polling thread, request an IRQ, submit
>>> URB, etc.)"
>>>
>>> input_close_device():
>>> "This function should be called by input handlers when they
>>> want to stop receive events from given input device."
>>>
>>> ->close() callback:
>>> "this method is called when the very last user calls
>>> input_close_device()"
>>>
>>> It seems to me that the callback names do not reflect their
>>> purpose: their meaning is not to "open" or to "close" but to
>>> give drivers a chance to control when they start or stop
>>> providing events to the input core.
>>>
>>> What would you say about changing the callbacks' names?
>>> I'd envsion: ->provide_events() instead of ->open() and
>>> ->stop_events() instead of ->close(). Of course drivers can
>>> exploit the fact of knowing that nobody wants any events
>>> from them and do whatever they consider appropriate, for
>>> example go into a low power mode - but the latter is beyond
>>> the scope of the input subsystem and is driver-specific.
>>
>> I don't have much of an opinion on changing the names,
>> to me open/close have always means start/stop receiving
>> events. This follows the everything is a file philosophy,
>> e.g. you can also not really "open" a serial port,
>> yet opening /dev/ttyS0 will activate the receive IRQ
>> of the UART, etc. So maybe we just need to make the
>> docs clearer rather then do the rename?  Doing the
>> rename is certainly going to cause a lot of churn.
> 
> Right, I can see now that the suggestion to change names is
> too far fetched. (I feel that release() would be better
> than close(), though). But it exposes the message I wanted to
> pass.
> 
>>
>> Anyways as said, I don't have much of an opinion,
>> so I'll leave commenting (more) on this to Dmitry.
>>
>>> With such a naming change in mind let's consider inhibiting.
>>> We want to be able to control when to disregard events from
>>> a given device. It makes sense to do it at device level, otherwise
>>> such an operation would have to be invoked in all associated
>>> handlers (those that have an open handle associating them with
>>> the device in question). But of course we can do better than
>>> merely ignoring the events received: we can tell the drivers
>>> that we don't want any events from them, and later, at uninhibit
>>> time, tell them to start providing the events again. Conceptually,
>>> the two operations (provide or don't provide envents) are exactly
>>> the same thing we want to be happening at input_open_device() and
>>> input_close_device() time. To me, changing the names of
>>> ->open() and ->close() exposes this fact very well.
>>>
>>> Consequently, ->inhibit() and ->uninhibit() won't be needed,
>>> and drivers which already implement ->provide_events() (formerly
>>> ->open()) and ->stop_events() (formerly ->close()) will receive
>>> full inhibit/uninhibit support for free (subject to how well they
>>> implement ->provide_events()/->stop_events()). Unless we can come
>>> up with what the drivers might be doing on top of ->stop_events()
>>> and ->provide_events() when inhibiting/uninhibiting, but it seems
>>> to me we can't. Can we?
>>
>> Right. I'm happy that you've come to see that both on open/close
>> and on inhibit/uninhibit we want to "start receiving events" and
>> "stop receiving events", so that we only need one set of callbacks.
>>
> 
> Yeah, that's my conclusion - at least on a conceptual level.
> 
> That said, what I can imagine is an existing driver (e.g. elan_i2c)
> which does not implement neither open() nor close(), but does have
> suspend() and resume(). Then it is maybe a bit easier to add inhibit()
> and uninhibit() /they would be similar to suspend and resume/ instead
> of open() and close(): If only open() and close() are possible, then
> the probe function needs to be extended to "close" the device before it
> gets registered, because from the moment it is registered it might be
> opened right away.

The probe only needs to "close" it if for some reason it
starts directly sending events in most cases the driver
must actively do something to get it to send events.

So in most cases this should be pretty straight forward,
as for having to do some init / power-on during probe
and then power-off at the end of the probe. Yes sometimes
something like that might be necessary.

Looking at your suggested elan_i2c changes I think they
look fine. I have the feeling that with some refactoring
they can be made a bit cleaner (I did not look a the
changes in too much detail) but overall I think they
look ok.

Note you may also want to look at using the runtime
suspend framework for this, doing a pm_runtime_get_sync()
in open() and then letting (runtime) suspend do the power
off if you set a reasonable timeout for autosuspend after
the last user is gone then that will also avoid an
unnecessary suspend / resume cycle between probe()
exiting and the first open() call and this avoids the
need to do a poweroff() at the end of probe(), the
runtime-pm framework will autosuspend the device after
the timeout expires.

Regards,

Hans


> And the device must be available earlier during the
> course of probe to query some parameters through i2c:
> 
> +static int elan_reactivate(struct elan_tp_data *data)
> +{
> +    struct device *dev = &data->client->dev;
> +    int ret;
> +
> +    ret = elan_enable_power(data);
> +    if (ret)
> +        dev_err(dev, "failed to restore power: %d\n", ret);
> +
> +    ret = elan_initialize(data);
> +    if (ret)
> +        dev_err(dev, "failed to re-initialize touchpad: %d\n", ret);
> +
> +    return ret;
> +}
> +
> +static int elan_open(struct input_dev *input)
> +{
> +    struct elan_tp_data *data = input_get_drvdata(input);
> +    struct i2c_client *client = data->client;
> +    int ret;
> +
> +    dev_dbg(&client->dev, "uninhibiting\n");
> +
> +    ret = mutex_lock_interruptible(&data->sysfs_mutex);
> +    if (ret)
> +        return ret;
> +
> +    ret = elan_reactivate(data);
> +    if (ret == 0)
> +        enable_irq(client->irq);
> +
> +    mutex_unlock(&data->sysfs_mutex);
> +
> +    return ret;
> +}
> +
> +static int elan_inhibit(struct input_dev *input)
> +{
> +    struct elan_tp_data *data = input_get_drvdata(input);
> +    struct i2c_client *client = data->client;
> +    int ret;
> +
> +    dev_dbg(&client->dev, "closing\n");
> +
> +    /*
> +     * We are taking the mutex to make sure sysfs operations are
> +     * complete before we attempt to bring the device into low[er]
> +     * power mode.
> +     */
> +    ret = mutex_lock_interruptible(&data->sysfs_mutex);
> +    if (ret)
> +        return ret;
> +
> +    disable_irq(client->irq);
> +
> +    ret = elan_disable_power(data);
> +    if (ret)
> +        enable_irq(client->irq);
> +
> +    mutex_unlock(&data->sysfs_mutex);
> +
> +    return ret;
> +}
> +
> +static void elan_close(struct input_dev *input)
> +{
> +    elan_inhibit(input);
> +}
> +
>   static int elan_query_device_info(struct elan_tp_data *data)
>   {
>       int error;
>       u16 ic_type;
> 
>       error = data->ops->get_version(data->client, false, &data->fw_version);
>       if (error)
>           return error;
> 
>       error = data->ops->get_checksum(data->client, false,
>                       &data->fw_checksum);
>       if (error)
>           return error;
> 
>       error = data->ops->get_version(data->client, true, &data->iap_version);
>       if (error)
>           return error;
> @@ -1071,34 +1141,36 @@ static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
> 
>   static int elan_setup_input_device(struct elan_tp_data *data)
>   {
>       struct device *dev = &data->client->dev;
>       struct input_dev *input;
>       unsigned int max_width = max(data->width_x, data->width_y);
>       unsigned int min_width = min(data->width_x, data->width_y);
>       int error;
> 
>       input = devm_input_allocate_device(dev);
>       if (!input)
>           return -ENOMEM;
> 
>       input->name = "Elan Touchpad";
>       input->id.bustype = BUS_I2C;
>       input->id.vendor = ELAN_VENDOR_ID;
>       input->id.product = data->product_id;
> +    input->open = elan_open;
> +    input->close = elan_close;
>       input_set_drvdata(input, data);
> 
>       error = input_mt_init_slots(input, ETP_MAX_FINGERS,
>                       INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
>       if (error) {
>           dev_err(dev, "failed to initialize MT slots: %d\n", error);
>           return error;
>       }
> 
>       __set_bit(EV_ABS, input->evbit);
>       __set_bit(INPUT_PROP_POINTER, input->propbit);
>       if (data->clickpad) {
>           __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
>       } else {
>           __set_bit(BTN_RIGHT, input->keybit);
>           if (data->middle_button)
>               __set_bit(BTN_MIDDLE, input->keybit);
> @@ -1253,34 +1325,40 @@ static int elan_probe(struct i2c_client *client,
>       if (!irqflags)
>           irqflags = IRQF_TRIGGER_FALLING;
> 
>       error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
>                         irqflags | IRQF_ONESHOT,
>                         client->name, data);
>       if (error) {
>           dev_err(dev, "cannot register irq=%d\n", client->irq);
>           return error;
>       }
> 
>       error = devm_device_add_groups(dev, elan_sysfs_groups);
>       if (error) {
>           dev_err(dev, "failed to create sysfs attributes: %d\n", error);
>           return error;
>       }
> 
> +    error = elan_inhibit(data->input);
> +    if (error) {
> +        dev_err(dev, "failed to inhibit input device before registering: %d\n", error);
> +        return error;
> +    }
> +
>       error = input_register_device(data->input);
>       if (error) {
>           dev_err(dev, "failed to register input device: %d\n", error);
>           return error;
>       }
> 
>       if (data->tp_input) {
>           error = input_register_device(data->tp_input);
>           if (error) {
>               dev_err(&client->dev,
>                   "failed to register TrackPoint input device: %d\n",
>                   error);
>               return error;
>           }
>       }
> 
>       /*
> @@ -1294,72 +1372,71 @@ static int elan_probe(struct i2c_client *client,
>   }
> 
>   static int __maybe_unused elan_suspend(struct device *dev)
>   {
>       struct i2c_client *client = to_i2c_client(dev);
>       struct elan_tp_data *data = i2c_get_clientdata(client);
>       int ret;
> 
>       /*
>        * We are taking the mutex to make sure sysfs operations are
>        * complete before we attempt to bring the device into low[er]
>        * power mode.
>        */
>       ret = mutex_lock_interruptible(&data->sysfs_mutex);
>       if (ret)
>           return ret;
> 
> -    disable_irq(client->irq);
> +    mutex_lock(&data->input->mutex);
> +    if (input_device_enabled(data->input)) {
> +        disable_irq(client->irq);
> 
> -    if (device_may_wakeup(dev)) {
> -        ret = elan_sleep(data);
> -        /* Enable wake from IRQ */
> -        data->irq_wake = (enable_irq_wake(client->irq) == 0);
> -    } else {
> -        ret = elan_disable_power(data);
> +        if (device_may_wakeup(dev)) {
> +            ret = elan_sleep(data);
> +            /* Enable wake from IRQ */
> +            data->irq_wake = (enable_irq_wake(client->irq) == 0);
> +        } else {
> +            ret = elan_disable_power(data);
> +        }
>       }
> +    mutex_unlock(&data->input->mutex);
> 
>       mutex_unlock(&data->sysfs_mutex);
>       return ret;
>   }
> 
>   static int __maybe_unused elan_resume(struct device *dev)
>   {
>       struct i2c_client *client = to_i2c_client(dev);
>       struct elan_tp_data *data = i2c_get_clientdata(client);
> -    int error;
> +    int ret = 0;
> 
> -    if (device_may_wakeup(dev) && data->irq_wake) {
> -        disable_irq_wake(client->irq);
> -        data->irq_wake = false;
> -    }
> +    mutex_lock(&data->input->mutex);
> +    if (input_device_enabled(data->input)) {
> +        if (data->irq_wake) {
> +            disable_irq_wake(client->irq);
> +            data->irq_wake = false;
> +        }
> 
> -    error = elan_enable_power(data);
> -    if (error) {
> -        dev_err(dev, "power up when resuming failed: %d\n", error);
> -        goto err;
> +        ret = elan_reactivate(data);
> +        enable_irq(data->client->irq);
>       }
> +    mutex_unlock(&data->input->mutex);
> 
> -    error = elan_initialize(data);
> -    if (error)
> -        dev_err(dev, "initialize when resuming failed: %d\n", error);
> -
> -err:
> -    enable_irq(data->client->irq);
> -    return error;
> +    return ret;
>   }
> 
> Regards,
> 
> Andrzej
> 


  reply index

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200506002746.GB89269@dtor-ws>
2020-05-15 16:49 ` Andrzej Pietrasiewicz
2020-05-15 16:51   ` [PATCHv2 1/7] Input: add input_device_enabled() Andrzej Pietrasiewicz
2020-05-15 16:52   ` [PATCHv2 4/7] iio: adc: exynos: Use input_device_enabled() Andrzej Pietrasiewicz
2020-05-15 16:52   ` [PATCHv2 6/7] Input: Add "inhibited" property Andrzej Pietrasiewicz
2020-05-15 18:19   ` [PATCHv2 0/7] Support inhibiting input devices Hans de Goede
2020-05-17 22:55     ` Peter Hutterer
2020-05-18  2:40       ` Dmitry Torokhov
2020-05-18  7:36         ` Hans de Goede
2020-05-22 15:35         ` Andrzej Pietrasiewicz
2020-05-27  6:13           ` Peter Hutterer
2020-05-18 10:48     ` Andrzej Pietrasiewicz
2020-05-18 12:24       ` Hans de Goede
2020-05-18 13:49         ` Andrzej Pietrasiewicz
2020-05-18 14:23           ` Hans de Goede
2020-05-19  9:02             ` Andrzej Pietrasiewicz
2020-05-19  9:36               ` Hans de Goede
2020-05-27  6:34                 ` Dmitry Torokhov
2020-06-02 16:56                   ` Andrzej Pietrasiewicz
2020-06-02 17:52                     ` Dmitry Torokhov
2020-06-02 18:50                       ` Andrzej Pietrasiewicz
2020-06-02 20:19                         ` Hans de Goede
2020-06-03 13:07                           ` Andrzej Pietrasiewicz
2020-06-03 17:38                             ` Hans de Goede
2020-06-03 17:54                               ` Andrzej Pietrasiewicz
2020-06-03 19:37                                 ` Hans de Goede [this message]
2020-06-04  7:28                                   ` Dmitry Torokhov
2020-06-05 17:33                                     ` [PATCH v3 " Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 1/7] Input: add input_device_enabled() Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 2/7] Input: use input_device_enabled() Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 3/7] ACPI: button: Access input device's users under appropriate mutex Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 4/7] ACPI: button: Use input_device_enabled() helper Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 5/7] iio: adc: exynos: Use input_device_enabled() Andrzej Pietrasiewicz
2020-06-05 19:49                                         ` Michał Mirosław
2020-06-05 17:33                                       ` [PATCH v3 6/7] platform/x86: thinkpad_acpi: " Andrzej Pietrasiewicz
2020-06-05 17:33                                       ` [PATCH v3 7/7] Input: Add "inhibited" property Andrzej Pietrasiewicz
2020-06-05 17:41                                         ` Hans de Goede
2020-06-08 11:22                                           ` [PATCH v4 0/7] Support inhibiting input devices Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 1/7] Input: add input_device_enabled() Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 2/7] Input: use input_device_enabled() Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 3/7] ACPI: button: Access input device's users under appropriate mutex Andrzej Pietrasiewicz
2020-06-24 15:00                                               ` Rafael J. Wysocki
2020-06-25  5:23                                                 ` Dmitry Torokhov
2020-06-25 10:55                                                   ` Rafael J. Wysocki
2020-06-08 11:22                                             ` [PATCH v4 4/7] ACPI: button: Use input_device_enabled() helper Andrzej Pietrasiewicz
2020-06-25  5:24                                               ` Dmitry Torokhov
2020-06-08 11:22                                             ` [PATCH v4 5/7] iio: adc: exynos: Use input_device_enabled() Andrzej Pietrasiewicz
2020-06-10  1:28                                               ` Michał Mirosław
2020-06-10  7:52                                                 ` [FIXED PATCH " Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 6/7] platform/x86: thinkpad_acpi: " Andrzej Pietrasiewicz
2020-06-08 11:22                                             ` [PATCH v4 7/7] Input: Add "inhibited" property Andrzej Pietrasiewicz
2020-06-10  9:49                                             ` [PATCH v4 0/7] Support inhibiting input devices Hans de Goede
2020-06-10 10:38                                               ` Rafael J. Wysocki
2020-06-10 13:12                                                 ` Andrzej Pietrasiewicz
2020-06-10 13:21                                                   ` Hans de Goede
2020-06-10 13:41                                                     ` Andrzej Pietrasiewicz
2020-06-12  8:30                                                       ` Hans de Goede
2020-06-12  8:47                                                         ` Andrzej Pietrasiewicz
2020-06-16 17:29                                                         ` [PATCH] Input: document inhibiting Andrzej Pietrasiewicz
2020-06-16 17:38                                                           ` Randy Dunlap
2020-06-17  7:44                                                           ` Hans de Goede
2020-06-17 10:18                                                             ` [PATCH v2] " Andrzej Pietrasiewicz
2020-06-17 10:21                                                               ` Hans de Goede
2020-06-17 16:52                                                               ` Randy Dunlap
2020-06-23 13:35                                                               ` Pavel Machek
2020-06-10 14:01                                                     ` [PATCH v4 0/7] Support inhibiting input devices Rafael J. Wysocki
2020-06-10 13:52                                                 ` Hans de Goede
2020-06-10 18:28                                                 ` Dmitry Torokhov
2020-06-12  8:14                                                   ` Hans de Goede
2020-06-12  8:17                                             ` Hans de Goede
2020-08-03 14:40                                               ` Andrzej Pietrasiewicz
2020-06-07 20:24                                       ` [PATCH v3 " Pavel Machek
2020-06-08  5:37                                         ` Dmitry Torokhov
2020-06-08  9:28                                           ` Andrzej Pietrasiewicz

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Linux-Samsung-soc Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-samsung-soc/0 linux-samsung-soc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-samsung-soc linux-samsung-soc/ https://lore.kernel.org/linux-samsung-soc \
		linux-samsung-soc@vger.kernel.org
	public-inbox-index linux-samsung-soc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-samsung-soc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git