linux-kernel - Re: [PATCH v3 2/2] Input: cs40l50 - Initial support for Cirrus Logic CS40L50

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <d1b9e063-54df-2dae-1487-c7c932fda145@linaro.org>
Date:   Thu, 10 Aug 2023 08:17:08 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     James Ogletree <james.ogletree@...rus.com>,
        dmitry.torokhov@...il.com
Cc:     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>, Lee Jones <lee@...nel.org>,
        Jeff LaBundy <jeff@...undy.com>, Joel Stanley <joel@....id.au>,
        Arnd Bergmann <arnd@...db.de>, Jacky Bai <ping.bai@....com>,
        Jean Delvare <jdelvare@...e.de>,
        Eddie James <eajames@...ux.ibm.com>,
        Markus Schneider-Pargmann <msp@...libre.com>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        patches@...rus.com, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] Input: cs40l50 - Initial support for Cirrus Logic
 CS40L50

On 09/08/2023 21:10, James Ogletree wrote:
> Introduce support for Cirrus Logic Device CS40L50: a
> haptics driver with waveform memory DSP and closed-loop
> algorithms.
> 
> Signed-off-by: James Ogletree <james.ogletree@...rus.com>

...

> +
> +static int cs40l50_cs_dsp_init(struct cs40l50_private *cs40l50)
> +{
> +	cs40l50->dsp.num = 1;
> +	cs40l50->dsp.type = WMFW_HALO;
> +	cs40l50->dsp.dev = cs40l50->dev;
> +	cs40l50->dsp.regmap = cs40l50->regmap;
> +	cs40l50->dsp.base = CS40L50_DSP1_CORE_BASE;
> +	cs40l50->dsp.base_sysinfo = CS40L50_DSP1_SYS_INFO_ID;
> +	cs40l50->dsp.mem = cs40l50_dsp_regions;
> +	cs40l50->dsp.num_mems = ARRAY_SIZE(cs40l50_dsp_regions);
> +	cs40l50->dsp.lock_regions = 0xFFFFFFFF;
> +	cs40l50->dsp.no_core_startstop = true;
> +	cs40l50->dsp.client_ops = &cs40l50_cs_dsp_client_ops;
> +
> +	return cs_dsp_halo_init(&cs40l50->dsp);
> +}
> +
> +int cs40l50_probe(struct cs40l50_private *cs40l50)
> +{
> +	int error, i, irq;
> +	u32 val;
> +
> +	mutex_init(&cs40l50->lock);
> +
> +	error = devm_regulator_bulk_get(cs40l50->dev, ARRAY_SIZE(cs40l50_supplies),
> +			cs40l50_supplies);
> +	if (error)
> +		return dev_err_probe(cs40l50->dev, error, "Failed to request supplies\n");
> +
> +	error = regulator_bulk_enable(ARRAY_SIZE(cs40l50_supplies), cs40l50_supplies);
> +	if (error)
> +		return dev_err_probe(cs40l50->dev, error, "Failed to enable supplies\n");
> +
> +	cs40l50->reset_gpio = devm_gpiod_get_optional(cs40l50->dev, "reset", GPIOD_OUT_HIGH);

None of the lines above or below seem to be wrapped according to Linux
coding style (80).

> +	if (IS_ERR(cs40l50->reset_gpio)) {
> +		error = PTR_ERR(cs40l50->reset_gpio);
> +		goto err;

Why do you disable IRQ now?

I asked to test this. Your entire cleanup path is:
1. not tested.
2. buggy.
3. done differently than Linux style. Use proper cleanup calls and
multiple goto labels.

> +	}
> +
> +	usleep_range(CS40L50_MIN_RESET_PULSE_WIDTH_US, CS40L50_MIN_RESET_PULSE_WIDTH_US + 100);
> +
> +	gpiod_set_value_cansleep(cs40l50->reset_gpio, 0);
> +
> +	usleep_range(CS40L50_CP_READY_DELAY_US, CS40L50_CP_READY_DELAY_US + 1000);
> +
> +	for (i = 0; i < CS40L50_DSP_TIMEOUT_COUNT; i++) {
> +		error = cs40l50_dsp_read(cs40l50, CS40L50_DSP1_HALO_STATE, &val);
> +		if (!error && val < 0xFFFF && val >= CS40L50_HALO_STATE_BOOT_DONE)
> +			break;
> +
> +		usleep_range(CS40L50_DSP_POLL_US, CS40L50_DSP_POLL_US + 100);
> +	}
> +
> +	if (i == CS40L50_DSP_TIMEOUT_COUNT) {
> +		dev_err(cs40l50->dev, "Firmware boot failed: %d, halo state = %#x\n", error, val);
> +		goto err;
> +	}
> +
> +	cs40l50->vibe_workqueue = alloc_ordered_workqueue("cs40l50_workqueue", WQ_HIGHPRI);
> +	if (!cs40l50->vibe_workqueue) {
> +		error = -ENOMEM;
> +		goto err;
> +	}
> +
> +	INIT_WORK(&cs40l50->vibe_start_work, cs40l50_vibe_start_worker);
> +	INIT_WORK(&cs40l50->vibe_stop_work, cs40l50_vibe_stop_worker);
> +
> +	error = cs40l50_cs_dsp_init(cs40l50);
> +	if (error)
> +		goto err;
> +
> +	error = cs40l50_input_init(cs40l50);
> +	if (error)
> +		goto err;
> +
> +	error = cs40l50_patch_firmware(cs40l50);
> +	if (error)
> +		goto err;
> +
> +	error = cs40l50_pseq_init(cs40l50);
> +	if (error)
> +		goto err;
> +
> +	error = cs40l50_config_bst(cs40l50);
> +	if (error)
> +		goto err;
> +
> +	error = devm_regmap_add_irq_chip(cs40l50->dev, cs40l50->regmap, cs40l50->irq,
> +			IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_LOW, 0, &cs40l50_regmap_irq_chip,
> +			&cs40l50->irq_data);
> +	if (error) {
> +		dev_err(cs40l50->dev, "Failed to register IRQ chip: %d\n", error);
> +		goto err;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(cs40l50_irqs); i++) {
> +		irq = regmap_irq_get_virq(cs40l50->irq_data, cs40l50_irqs[i].irq);
> +		if (irq < 0) {
> +			dev_err(cs40l50->dev, "Failed to get %s\n", cs40l50_irqs[i].name);
> +			error = irq;
> +			goto err;
> +		}
> +
> +		error = devm_request_threaded_irq(cs40l50->dev, irq, NULL, cs40l50_irqs[i].handler,
> +				IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_LOW,
> +						cs40l50_irqs[i].name, cs40l50);
> +		if (error) {
> +			dev_err(cs40l50->dev, "Failed to request IRQ %s: %d\n",
> +					cs40l50_irqs[i].name, error);
> +			goto err;
> +		}
> +	}
> +
> +	return 0;
> +
> +err:
> +	cs40l50_remove(cs40l50);
> +
> +	return error;
> +}
> +EXPORT_SYMBOL_GPL(cs40l50_probe);
> +
> +int cs40l50_remove(struct cs40l50_private *cs40l50)
> +{
> +	disable_irq(cs40l50->irq);
> +
> +	if (cs40l50->dsp.booted)
> +		cs_dsp_power_down(&cs40l50->dsp);
> +	if (&cs40l50->dsp)
> +		cs_dsp_remove(&cs40l50->dsp);
> +
> +	if (cs40l50->vibe_workqueue) {
> +		flush_workqueue(cs40l50->vibe_workqueue);
> +		destroy_workqueue(cs40l50->vibe_workqueue);
> +	}
> +
> +	gpiod_set_value_cansleep(cs40l50->reset_gpio, 1);
> +	regulator_bulk_disable(ARRAY_SIZE(cs40l50_supplies), cs40l50_supplies);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(cs40l50_remove);
> +
> +MODULE_DESCRIPTION("CS40L50 Advanced Haptic Driver");
> +MODULE_AUTHOR("James Ogletree, Cirrus Logic Inc. <james.ogletree@...rus.com>");

Nothing improved here. Don't send new version immediately after
responding to my comment, but allow discussion.

Best regards,
Krzysztof