linux-kernel - Re: [PATCH V2 2/4] gpio: gpio-f81504: Add Fintek F81504/508/512 PCIE-to-UART/GPIO GPIOLIB support

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Date:	Thu, 28 Jan 2016 14:03:04 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Peter Hung <hpeter@...il.com>, linus.walleij@...aro.org,
	gnurou@...il.com, gregkh@...uxfoundation.org,
	paul.gortmaker@...driver.com, lee.jones@...aro.org,
	jslaby@...e.com, peter_hong@...tek.com.tw
Cc:	heikki.krogerus@...ux.intel.com, peter@...leysoftware.com,
	soeren.grunewald@...y.de, udknight@...il.com,
	adam.lee@...onical.com, arnd@...db.de, manabian@...il.com,
	scottwood@...escale.com, yamada.masahiro@...ionext.com,
	paul.burton@...tec.com, mans@...sr.com, matthias.bgg@...il.com,
	ralf@...ux-mips.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-serial@...r.kernel.org,
	tom_tsai@...tek.com.tw, Peter Hung <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH V2 2/4] gpio: gpio-f81504: Add Fintek F81504/508/512
 PCIE-to-UART/GPIO GPIOLIB support

On Thu, 2016-01-28 at 17:20 +0800, Peter Hung wrote:
> This driver is GPIOLIB driver for F81504/508/512, it'll handle the
> GPIOLIB operation of this device. This module will depend on
> MFD_FINTEK_F81504_CORE.
> 



> +	/*
> +	 * The GPIO default driven mode for this device is open-
> drain. The
> +	 * GPIOLIB had no change GPIO mode API currently. So we
> leave the
> +	 * Push-Pull code below.
> +	 *
> +	 * pci_read_config_byte(dev, GPIO_START_ADDR + idx *
> GPIO_SET_OFFSET +
> +	 *			GPIO_DRIVE_EN_OFFSET, &tmp);
> +	 * pci_write_config_byte(dev, GPIO_START_ADDR + idx *
> GPIO_SET_OFFSET +
> +	 *			GPIO_DRIVE_EN_OFFSET, tmp |
> BIT(gpio_num));
> +	 */
> +
> +	/* set output data */
> +	tmp = inb(priv->gpio_ioaddr + gc->idx);

ioread8 is a bit better since it automatically works with IO space and
MMIO. But if you are certain you will always have the address in IO
space, you can disregard this comment.

> +static int f81504_gpio_probe(struct platform_device *pdev)
> +{
> +	int status;
> +	struct f81504_gpio_chip *gc;
> +	void *data = dev_get_platdata(&pdev->dev);
> +	u8 gpio_idx = *(u8 *)data;
> +	char *name;
> +
> +	if (gpio_idx >= ARRAY_SIZE(fintek_gpio_mapping)) {
> +		dev_err(&pdev->dev, "%s: gpio_idx:%d out of
> range.\n",
> +				__func__, gpio_idx);
> +		return -ENODEV;
> +	}
> +
> +	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
> +	if (!gc)
> +		return -ENOMEM;
> +
> 

> +	kfree(data);

What the heck?


> +	mutex_init(&gc->locker);
> +	platform_set_drvdata(pdev, gc);
> +
> +	name = devm_kzalloc(&pdev->dev, FINTEK_GPIO_NAME_LEN,
> GFP_KERNEL);
> +	if (!name)
> +		return -ENOMEM;
> +
> +	/* This will display like as GPIO-1x */
> +	sprintf(name, "%s-%dx", FINTEK_GPIO_DISPLAY, gpio_idx);
> +
> +	gc->chip.owner = THIS_MODULE;
> +	gc->chip.label = name;
> +	gc->chip.ngpio = 8;
> +	gc->chip.dev = &pdev->dev;
> +	gc->chip.get = f81504_gpio_get;
> +	gc->chip.set = f81504_gpio_set;
> +	gc->chip.direction_input = f81504_gpio_direction_in;
> +	gc->chip.direction_output = f81504_gpio_direction_out;
> +	gc->chip.get_direction = f81504_gpio_get_direction;
> +	gc->chip.can_sleep = 1;
> +	gc->chip.base = -1;
> +	gc->idx = gpio_idx;
> +
> 

> +	status = gpiochip_add(&gc->chip);
> +	if (status) {
> +		dev_err(&pdev->dev, "%s: gpiochip_add failed: %d\n",
> __func__,
> +				status);
> +		return -ENOMEM;

You ignored the status.

> +	}
> +
> +	return 0;

Perhaps just
return gpiochip_add(); ?

> +}
> +
> +static int f81504_gpio_remove(struct platform_device *pdev)
> +{
> +	struct f81504_gpio_chip *gc = platform_get_drvdata(pdev);
> +
> +	gpiochip_remove(&gc->chip);
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(f81504_gpio_pm_ops, f81504_gpio_suspend,
> +		f81504_gpio_resume);
> +
> +static struct platform_driver f81504_gpio_driver = {
> +	.driver = {
> +		.name	= F81504_GPIO_NAME,
> +		.owner	= THIS_MODULE,
> +		.pm     = &f81504_gpio_pm_ops,
> +	},
> +	.probe		= f81504_gpio_probe,
> +	.remove		= f81504_gpio_remove,
> +};
> +
> +module_platform_driver(f81504_gpio_driver);
> +
> +MODULE_AUTHOR("Peter Hong <Peter_Hong@...tek.com.tw>");
> +MODULE_DESCRIPTION("Fintek F81504/508/512 PCIE GPIOLIB driver");
> +MODULE_LICENSE("GPL");

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy