int __init pc8736x_gpio_init(void)
{
int rc;
dev_t devid;
pdev = platform_device_alloc(DEVNAME, 0);
if (!pdev)
return -ENOMEM;
rc = platform_device_add(pdev);
if (rc) {
rc = -ENODEV;
goto undo_platform_dev_alloc;
}
dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n");
if (!pc8736x_superio_present()) {
rc = -ENODEV;
dev_err(&pdev->dev, "no device found\n");
goto undo_platform_dev_add;
}
pc8736x_gpio_ops.dev = &pdev->dev;
__VERIFIER_assert(pc8736x_gpio_ops.dev == &pdev->dev);
/* Verify that chip and it's GPIO unit are both enabled.
My BIOS does this, so I take minimum action here
*/
rc = superio_inb(SIO_CF1);
if (!(rc & 0x01)) {
rc = -ENODEV;
dev_err(&pdev->dev, "device not enabled\n");
goto undo_platform_dev_add;
}
device_select(SIO_GPIO_UNIT);
if (!superio_inb(SIO_UNIT_ACT)) {
rc = -ENODEV;
dev_err(&pdev->dev, "GPIO unit not enabled\n");
goto undo_platform_dev_add;
}
/* read the GPIO unit base addr that chip responds to */
pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8
| superio_inb(SIO_BASE_LADDR));
if (!request_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE, DEVNAME)) {
rc = -ENODEV;
dev_err(&pdev->dev, "GPIO ioport %x busy\n",
pc8736x_gpio_base);
goto undo_platform_dev_add;
}
dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base);
if (major) {
devid = MKDEV(major, 0);
rc = register_chrdev_region(devid, PC8736X_GPIO_CT, DEVNAME);
} else {
rc = alloc_chrdev_region(&devid, 0, PC8736X_GPIO_CT, DEVNAME);
major = MAJOR(devid);
}
if (rc < 0) {
dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);
goto undo_request_region;
}
if (!major) {
major = rc;
dev_dbg(&pdev->dev, "got dynamic major %d\n", major);
}
pc8736x_init_shadow();
/* ignore minor errs, and succeed */
cdev_init(&pc8736x_gpio_cdev, &pc8736x_gpio_fileops);
cdev_add(&pc8736x_gpio_cdev, devid, PC8736X_GPIO_CT);
return 0;
undo_request_region:
release_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE);
undo_platform_dev_add:
platform_device_del(pdev);
undo_platform_dev_alloc:
platform_device_put(pdev);
return rc;
}
static int __init pc8736x_gpio_init(void)
{
int rc;
dev_t devid;
pdev = platform_device_alloc(DEVNAME, 0);
if (!pdev)
return -ENOMEM;
rc = platform_device_add(pdev);
if (rc) {
rc = -ENODEV;
goto undo_platform_dev_alloc;
}
dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n");
if (!pc8736x_superio_present()) {
rc = -ENODEV;
dev_err(&pdev->dev, "no device found\n");
goto undo_platform_dev_add;
}
pc8736x_gpio_ops.dev = &pdev->dev;
rc = superio_inb(SIO_CF1);
if (!(rc & 0x01)) {
rc = -ENODEV;
dev_err(&pdev->dev, "device not enabled\n");
goto undo_platform_dev_add;
}
device_select(SIO_GPIO_UNIT);
if (!superio_inb(SIO_UNIT_ACT)) {
rc = -ENODEV;
dev_err(&pdev->dev, "GPIO unit not enabled\n");
goto undo_platform_dev_add;
}
pc8736x_gpio_base = (superio_inb(SIO_BASE_HADDR) << 8
| superio_inb(SIO_BASE_LADDR));
if (!request_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE, DEVNAME)) {
rc = -ENODEV;
dev_err(&pdev->dev, "GPIO ioport %x busy\n",
pc8736x_gpio_base);
goto undo_platform_dev_add;
}
dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base);
if (major) {
devid = MKDEV(major, 0);
rc = register_chrdev_region(devid, PC8736X_GPIO_CT, DEVNAME);
} else {
rc = alloc_chrdev_region(&devid, 0, PC8736X_GPIO_CT, DEVNAME);
major = MAJOR(devid);
}
if (rc < 0) {
dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);
goto undo_request_region;
}
if (!major) {
major = rc;
dev_dbg(&pdev->dev, "got dynamic major %d\n", major);
}
pc8736x_init_shadow();
cdev_init(&pc8736x_gpio_cdev, &pc8736x_gpio_fileops);
cdev_add(&pc8736x_gpio_cdev, devid, PC8736X_GPIO_CT);
return 0;
undo_request_region:
release_region(pc8736x_gpio_base, PC8736X_GPIO_RANGE);
undo_platform_dev_add:
platform_device_del(pdev);
undo_platform_dev_alloc:
platform_device_put(pdev);
return rc;
}