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Message-ID: <ZZoFUwOEF6NByIp2@google.com>
Date: Sat, 6 Jan 2024 17:58:43 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: James Ogletree <jogletre@...nsource.cirrus.com>
Cc: James Ogletree <james.ogletree@...rus.com>,
Fred Treven <fred.treven@...rus.com>,
Ben Bright <ben.bright@...rus.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Simon Trimmer <simont@...nsource.cirrus.com>,
Charles Keepax <ckeepax@...nsource.cirrus.com>,
Richard Fitzgerald <rf@...nsource.cirrus.com>,
Lee Jones <lee@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
James Schulman <james.schulman@...rus.com>,
David Rhodes <david.rhodes@...rus.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Peng Fan <peng.fan@....com>, Jeff LaBundy <jeff@...undy.com>,
Sebastian Reichel <sebastian.reichel@...labora.com>,
Jacky Bai <ping.bai@....com>,
Weidong Wang <wangweidong.a@...nic.com>,
Arnd Bergmann <arnd@...db.de>,
Herve Codina <herve.codina@...tlin.com>,
Shuming Fan <shumingf@...ltek.com>,
Shenghao Ding <13916275206@....com>,
Ryan Lee <ryans.lee@...log.com>,
Linus Walleij <linus.walleij@...aro.org>,
"open list:CIRRUS LOGIC HAPTIC DRIVERS" <patches@...nsource.cirrus.com>,
"open list:INPUT (KEYBOARD, MOUSE, JOYSTICK, TOUCHSCREEN)..." <linux-input@...r.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
"open list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." <linux-sound@...r.kernel.org>,
"moderated list:CIRRUS LOGIC AUDIO CODEC DRIVERS" <alsa-devel@...a-project.org>
Subject: Re: [PATCH v5 4/5] Input: cs40l50 - Add support for the CS40L50
haptic driver
Hi James,
On Thu, Jan 04, 2024 at 10:36:37PM +0000, James Ogletree wrote:
> +static int vibra_add(struct input_dev *dev, struct ff_effect *effect,
> + struct ff_effect *old)
> +{
> + struct vibra_info *info = input_get_drvdata(dev);
> + u32 len = effect->u.periodic.custom_len;
> +
> + if (effect->type != FF_PERIODIC || effect->u.periodic.waveform != FF_CUSTOM) {
> + dev_err(info->dev, "Type (%#X) or waveform (%#X) unsupported\n",
> + effect->type, effect->u.periodic.waveform);
> + return -EINVAL;
> + }
> +
> + memcpy(&info->add_effect, effect, sizeof(struct ff_effect));
structures can be assigned, no need for memcpy.
> +
> + info->add_effect.u.periodic.custom_data = kcalloc(len, sizeof(s16), GFP_KERNEL);
> + if (!info->add_effect.u.periodic.custom_data)
> + return -ENOMEM;
> +
> + if (copy_from_user(info->add_effect.u.periodic.custom_data,
> + effect->u.periodic.custom_data, sizeof(s16) * len)) {
> + info->add_error = -EFAULT;
> + goto out_free;
> + }
> +
> + queue_work(info->vibe_wq, &info->add_work);
> + flush_work(&info->add_work);
I do not understand the need of scheduling a work here. You are
obviously in a sleeping context (otherwise you would not be able to
execute flush_work()) so you should be able to upload the effect right
here.
...
> +
> +static int vibra_playback(struct input_dev *dev, int effect_id, int val)
> +{
> + struct vibra_info *info = input_get_drvdata(dev);
> +
> + if (val > 0) {
value is supposed to signal how many times an effect should be repeated.
It looks like you are not handling this at all.
> + info->start_effect = &dev->ff->effects[effect_id];
> + queue_work(info->vibe_wq, &info->vibe_start_work);
The API allows playback of several effects at once, the way you have it
done here if multiple requests come at same time only one will be
handled.
> + } else {
> + queue_work(info->vibe_wq, &info->vibe_stop_work);
Which effect are you stopping? All of them? You need to stop a
particular one.
> + }
Essentially you need a queue of requests and a single work handling all
of them...
...
> +
> +static int cs40l50_vibra_probe(struct platform_device *pdev)
> +{
> + struct cs40l50 *cs40l50 = dev_get_drvdata(pdev->dev.parent);
> + struct vibra_info *info;
> + int error;
> +
> + info = devm_kzalloc(pdev->dev.parent, sizeof(*info), GFP_KERNEL);
> + if (!info)
> + return -ENOMEM;
> +
> + info->dev = cs40l50->dev;
> + info->regmap = cs40l50->regmap;
> +
> + info->input = devm_input_allocate_device(info->dev);
> + if (!info->input)
> + return -ENOMEM;
> +
> + info->input->id.product = cs40l50->devid & 0xFFFF;
> + info->input->id.version = cs40l50->revid;
> + info->input->name = "cs40l50_vibra";
> +
> + input_set_drvdata(info->input, info);
> + input_set_capability(info->input, EV_FF, FF_PERIODIC);
> + input_set_capability(info->input, EV_FF, FF_CUSTOM);
> +
> + error = input_ff_create(info->input, FF_MAX_EFFECTS);
> + if (error) {
> + dev_err(info->dev, "Failed to create input device\n");
> + return error;
> + }
> +
> + info->input->ff->upload = vibra_add;
> + info->input->ff->playback = vibra_playback;
> + info->input->ff->erase = vibra_erase;
> +
> + INIT_LIST_HEAD(&info->effect_head);
> +
> + info->dsp = cs40l50_dsp;
> +
> + info->vibe_wq = alloc_ordered_workqueue("vibe_wq", 0);
> + if (!info->vibe_wq)
> + return -ENOMEM;
> +
> + error = devm_add_action_or_reset(info->dev, vibra_remove_wq, info);
> + if (error)
> + return error;
Why do you need a dedicated workqueue? So you can flush works?
> +
> + mutex_init(&info->lock);
> +
> + INIT_WORK(&info->vibe_start_work, vibra_start_worker);
> + INIT_WORK(&info->vibe_stop_work, vibra_stop_worker);
> + INIT_WORK(&info->erase_work, vibra_erase_worker);
> + INIT_WORK(&info->add_work, vibra_add_worker);
> +
> + error = input_register_device(info->input);
> + if (error) {
> + dev_err(info->dev, "Failed to register input device\n");
> + input_free_device(info->input);
Not needed, you are using devm_input_allocate_device().
> + return error;
> + }
> +
> + return devm_add_action_or_reset(info->dev, vibra_input_unregister,
> + info->input);
Not needed, managed input devices will be unregistered automatically by
devm.
Thanks.
--
Dmitry
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