Re: [PATCH 2/4] cs5535-gpio: convert from pci device to platform device

[Andres Salomon <dilinger@queued.net>]

Samuel, thanks for applying the mfd patch.  I'm not sure how the rest
of these should be handled; they depend upon the first patch.  Would you
prefer they go through the mfd tree, or go in via Andrew's tree?

On Sat, 23 Oct 2010 00:41:09 -0700
Andres Salomon <dilinger@queued.net> wrote:

> 
> The cs5535-mfd driver now takes care of the PCI BAR handling; this
> simplifies the gpio driver a lot.
> 
> Signed-off-by: Andres Salomon <dilinger@queued.net>
> ---
>  drivers/gpio/cs5535-gpio.c |   93
> +++++++++++++++----------------------------- 1 files changed, 31
> insertions(+), 62 deletions(-)
> 
> diff --git a/drivers/gpio/cs5535-gpio.c b/drivers/gpio/cs5535-gpio.c
> index e23c068..ea6290f 100644
> --- a/drivers/gpio/cs5535-gpio.c
> +++ b/drivers/gpio/cs5535-gpio.c
> @@ -11,13 +11,12 @@
>  #include <linux/kernel.h>
>  #include <linux/spinlock.h>
>  #include <linux/module.h>
> -#include <linux/pci.h>
> +#include <linux/platform_device.h>
>  #include <linux/gpio.h>
>  #include <linux/io.h>
>  #include <linux/cs5535.h>
>  
>  #define DRV_NAME "cs5535-gpio"
> -#define GPIO_BAR 1
>  
>  /*
>   * Some GPIO pins
> @@ -46,7 +45,7 @@ static struct cs5535_gpio_chip {
>  	struct gpio_chip chip;
>  	resource_size_t base;
>  
> -	struct pci_dev *pdev;
> +	struct platform_device *pdev;
>  	spinlock_t lock;
>  } cs5535_gpio_chip;
>  
> @@ -226,10 +225,10 @@ static struct cs5535_gpio_chip cs5535_gpio_chip
> = { },
>  };
>  
> -static int __init cs5535_gpio_probe(struct pci_dev *pdev,
> -		const struct pci_device_id *pci_id)
> +static int __devinit cs5535_gpio_probe(struct platform_device *pdev)
>  {
> -	int err;
> +	struct resource *res;
> +	int err = -EIO;
>  	ulong mask_orig = mask;
>  
>  	/* There are two ways to get the GPIO base address; one is by
> @@ -239,25 +238,24 @@ static int __init cs5535_gpio_probe(struct
> pci_dev *pdev,
>  	 * it turns out to be unreliable in the face of crappy
> BIOSes, we
>  	 * can always go back to using MSRs.. */
>  
> -	err = pci_enable_device_io(pdev);
> -	if (err) {
> -		dev_err(&pdev->dev, "can't enable device IO\n");
> +	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
> +	if (!res) {
> +		dev_err(&pdev->dev, "can't fetch device resource
> info\n"); goto done;
>  	}
>  
> -	err = pci_request_region(pdev, GPIO_BAR, DRV_NAME);
> -	if (err) {
> -		dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n",
> GPIO_BAR);
> +	if (!request_region(res->start, resource_size(res),
> pdev->name)) {
> +		dev_err(&pdev->dev, "can't request region\n");
>  		goto done;
>  	}
>  
>  	/* set up the driver-specific struct */
> -	cs5535_gpio_chip.base = pci_resource_start(pdev, GPIO_BAR);
> +	cs5535_gpio_chip.base = res->start;
>  	cs5535_gpio_chip.pdev = pdev;
>  	spin_lock_init(&cs5535_gpio_chip.lock);
>  
> -	dev_info(&pdev->dev, "allocated PCI BAR #%d: base 0x%llx\n",
> GPIO_BAR,
> -			(unsigned long long) cs5535_gpio_chip.base);
> +	dev_info(&pdev->dev, "region 0x%x - 0x%x reserved\n",
> +			res->start, res->end);
>  
>  	/* mask out reserved pins */
>  	mask &= 0x1F7FFFFF;
> @@ -275,78 +273,49 @@ static int __init cs5535_gpio_probe(struct
> pci_dev *pdev, if (err)
>  		goto release_region;
>  
> -	dev_info(&pdev->dev, DRV_NAME ": GPIO support successfully
> loaded.\n");
> +	dev_info(&pdev->dev, "GPIO support successfully loaded.\n");
>  	return 0;
>  
>  release_region:
> -	pci_release_region(pdev, GPIO_BAR);
> +	release_region(res->start, resource_size(res));
>  done:
>  	return err;
>  }
>  
> -static void __exit cs5535_gpio_remove(struct pci_dev *pdev)
> +static int __devexit cs5535_gpio_remove(struct platform_device *pdev)
>  {
> +	struct resource *r;
>  	int err;
>  
>  	err = gpiochip_remove(&cs5535_gpio_chip.chip);
>  	if (err) {
>  		/* uhh? */
>  		dev_err(&pdev->dev, "unable to remove gpio_chip?\n");
> +		return err;
>  	}
> -	pci_release_region(pdev, GPIO_BAR);
> -}
> -
> -static struct pci_device_id cs5535_gpio_pci_tbl[] = {
> -	{ PCI_DEVICE(PCI_VENDOR_ID_NS,
> PCI_DEVICE_ID_NS_CS5535_ISA) },
> -	{ PCI_DEVICE(PCI_VENDOR_ID_AMD,
> PCI_DEVICE_ID_AMD_CS5536_ISA) },
> -	{ 0, },
> -};
> -MODULE_DEVICE_TABLE(pci, cs5535_gpio_pci_tbl);
>  
> -/*
> - * We can't use the standard PCI driver registration stuff here,
> since
> - * that allows only one driver to bind to each PCI device (and we
> want
> - * multiple drivers to be able to bind to the device).  Instead,
> manually
> - * scan for the PCI device, request a single region, and keep track
> of the
> - * devices that we're using.
> - */
> -
> -static int __init cs5535_gpio_scan_pci(void)
> -{
> -	struct pci_dev *pdev;
> -	int err = -ENODEV;
> -	int i;
> -
> -	for (i = 0; i < ARRAY_SIZE(cs5535_gpio_pci_tbl); i++) {
> -		pdev = pci_get_device(cs5535_gpio_pci_tbl[i].vendor,
> -				cs5535_gpio_pci_tbl[i].device, NULL);
> -		if (pdev) {
> -			err = cs5535_gpio_probe(pdev,
> &cs5535_gpio_pci_tbl[i]);
> -			if (err)
> -				pci_dev_put(pdev);
> -
> -			/* we only support a single CS5535/6
> southbridge */
> -			break;
> -		}
> -	}
> -
> -	return err;
> +	r = platform_get_resource(pdev, IORESOURCE_IO, 0);
> +	release_region(r->start, resource_size(r));
> +	return 0;
>  }
>  
> -static void __exit cs5535_gpio_free_pci(void)
> -{
> -	cs5535_gpio_remove(cs5535_gpio_chip.pdev);
> -	pci_dev_put(cs5535_gpio_chip.pdev);
> -}
> +static struct platform_driver cs5535_gpio_drv = {
> +	.driver = {
> +		.name = DRV_NAME,
> +		.owner = THIS_MODULE,
> +	},
> +	.probe = cs5535_gpio_probe,
> +	.remove = __devexit_p(cs5535_gpio_remove),
> +};
>  
>  static int __init cs5535_gpio_init(void)
>  {
> -	return cs5535_gpio_scan_pci();
> +	return platform_driver_register(&cs5535_gpio_drv);
>  }
>  
>  static void __exit cs5535_gpio_exit(void)
>  {
> -	cs5535_gpio_free_pci();
> +	platform_driver_unregister(&cs5535_gpio_drv);
>  }
>  
>  module_init(cs5535_gpio_init);