linux-kernel - Re: [PATCH 2/4] usb: typec: ucsi: stm32g0: add support for stm32g0 i2c controller

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Date:   Tue, 28 Jun 2022 09:21:12 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...s.st.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:     <robh+dt@...nel.org>, <gregkh@...uxfoundation.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <amelie.delaunay@...s.st.com>, <alexandre.torgue@...s.st.com>
Subject: Re: [PATCH 2/4] usb: typec: ucsi: stm32g0: add support for stm32g0
 i2c controller

On 6/27/22 15:17, Heikki Krogerus wrote:
> Hi,
> 
> On Fri, Jun 24, 2022 at 05:54:11PM +0200, Fabrice Gasnier wrote:
>> +static int ucsi_stm32g0_probe(struct i2c_client *client, const struct i2c_device_id *id)
>> +{
>> +	struct device *dev = &client->dev;
>> +	struct ucsi_stm32g0 *g0;
>> +	int ret;
>> +
>> +	g0 = devm_kzalloc(dev, sizeof(*g0), GFP_KERNEL);
>> +	if (!g0)
>> +		return -ENOMEM;
>> +
>> +	g0->dev = dev;
>> +	g0->client = client;
>> +	init_completion(&g0->complete);
>> +	i2c_set_clientdata(client, g0);
>> +
>> +	g0->ucsi = ucsi_create(dev, &ucsi_stm32g0_ops);
>> +	if (IS_ERR(g0->ucsi))
>> +		return PTR_ERR(g0->ucsi);
>> +
>> +	ucsi_set_drvdata(g0->ucsi, g0);
>> +
>> +	/* Request alert interrupt */
>> +	ret = request_threaded_irq(client->irq, NULL, ucsi_stm32g0_irq_handler, IRQF_ONESHOT,
>> +				   dev_name(&client->dev), g0);
>> +	if (ret) {
>> +		dev_err_probe(dev, ret, "request IRQ failed\n");
>> +		goto destroy;
>> +	}
>> +
>> +	ret = ucsi_register(g0->ucsi);
>> +	if (ret) {
>> +		dev_err_probe(dev, ret, "ucsi_register failed\n");
>> +		goto freeirq;
>> +	}
> 
> If there isn't UCSI firmware, then ucsi_register() will always safely
> fail here, right?

Hi Heikki,

Yes, in such a case, the first i2c read (UCSI_VERSION) in
ucsi_register() will return an error and safely fail here.

Thanks for reviewing,
Best Regards,
Fabrice

> 
> 
>> +	return 0;
>> +
>> +freeirq:
>> +	free_irq(client->irq, g0);
>> +destroy:
>> +	ucsi_destroy(g0->ucsi);
>> +
>> +	return ret;
>> +}
> 
> 
> thanks,
>