gpio: Convert cs5535 from pci device to platform device

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>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 31 insertions, 62 deletions

diff --git a/drivers/gpio/cs5535-gpio.c b/drivers/gpio/cs5535-gpio.c
index 815d98b2c1ba..70967e23bc3d 100644
--- a/drivers/gpio/cs5535-gpio.c
+++ b/drivers/gpio/cs5535-gpio.c
@@ -11,14 +11,13 @@
 #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>
 #include <asm/msr.h>
 
 #define DRV_NAME "cs5535-gpio"
-#define GPIO_BAR 1
 
 /*
  * Some GPIO pins
@@ -47,7 +46,7 @@ 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;
 
@@ -301,10 +300,10 @@ 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
@@ -314,25 +313,24 @@ 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;
@@ -350,78 +348,49 @@ 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);