platform/x86: dell-smo8800: Convert to be a platform driver

ACPI core in conjunction with platform driver core provides
an infrastructure to enumerate ACPI devices. Use it in order
to remove a lot of boilerplate code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Pali Rohár <pali@kernel.org>
Tested-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20210803194039.35083-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/dell/Kconfig b/drivers/platform/x86/dell/Kconfig
index 9e7314d..821aba3 100644 (file)
--- a/drivers/platform/x86/dell/Kconfig
+++ b/drivers/platform/x86/dell/Kconfig
@@ -140,7 +140,7 @@ config DELL_SMBIOS_SMM
 config DELL_SMO8800
        tristate "Dell Latitude freefall driver (ACPI SMO88XX)"
        default m
-       depends on ACPI
+       depends on ACPI || COMPILE_TEST
        help
          Say Y here if you want to support SMO88XX freefall devices
          on Dell Latitude laptops.

diff --git a/drivers/platform/x86/dell/dell-smo8800.c b/drivers/platform/x86/dell/dell-smo8800.c
index 5d9304a..3385e85 100644 (file)
--- a/drivers/platform/x86/dell/dell-smo8800.c
+++ b/drivers/platform/x86/dell/dell-smo8800.c
@@ -10,13 +10,14 @@
 
 #define DRIVER_NAME "smo8800"
 
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/acpi.h>
+#include <linux/fs.h>
 #include <linux/interrupt.h>
+#include <linux/kernel.h>
 #include <linux/miscdevice.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
 #include <linux/uaccess.h>
-#include <linux/fs.h>
 
 struct smo8800_device {
        u32 irq;                     /* acpi device irq */
@@ -44,37 +45,6 @@ static irqreturn_t smo8800_interrupt_thread(int irq, void *data)
        return IRQ_HANDLED;
 }
 
-static acpi_status smo8800_get_resource(struct acpi_resource *resource,
-                                       void *context)
-{
-       struct acpi_resource_extended_irq *irq;
-
-       if (resource->type != ACPI_RESOURCE_TYPE_EXTENDED_IRQ)
-               return AE_OK;
-
-       irq = &resource->data.extended_irq;
-       if (!irq || !irq->interrupt_count)
-               return AE_OK;
-
-       *((u32 *)context) = irq->interrupts[0];
-       return AE_CTRL_TERMINATE;
-}
-
-static u32 smo8800_get_irq(struct acpi_device *device)
-{
-       u32 irq = 0;
-       acpi_status status;
-
-       status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
-                                    smo8800_get_resource, &irq);
-       if (ACPI_FAILURE(status)) {
-               dev_err(&device->dev, "acpi_walk_resources failed\n");
-               return 0;
-       }
-
-       return irq;
-}
-
 static ssize_t smo8800_misc_read(struct file *file, char __user *buf,
                                 size_t count, loff_t *pos)
 {
@@ -136,7 +106,7 @@ static const struct file_operations smo8800_misc_fops = {
        .release = smo8800_misc_release,
 };
 
-static int smo8800_add(struct acpi_device *device)
+static int smo8800_probe(struct platform_device *device)
 {
        int err;
        struct smo8800_device *smo8800;
@@ -160,14 +130,12 @@ static int smo8800_add(struct acpi_device *device)
                return err;
        }
 
-       device->driver_data = smo8800;
+       platform_set_drvdata(device, smo8800);
 
-       smo8800->irq = smo8800_get_irq(device);
-       if (!smo8800->irq) {
-               dev_err(&device->dev, "failed to obtain IRQ\n");
-               err = -EINVAL;
+       err = platform_get_irq(device, 0);
+       if (err < 0)
                goto error;
-       }
+       smo8800->irq = err;
 
        err = request_threaded_irq(smo8800->irq, smo8800_interrupt_quick,
                                   smo8800_interrupt_thread,
@@ -189,9 +157,9 @@ error:
        return err;
 }
 
-static int smo8800_remove(struct acpi_device *device)
+static int smo8800_remove(struct platform_device *device)
 {
-       struct smo8800_device *smo8800 = device->driver_data;
+       struct smo8800_device *smo8800 = platform_get_drvdata(device);
 
        free_irq(smo8800->irq, smo8800);
        misc_deregister(&smo8800->miscdev);
@@ -211,21 +179,17 @@ static const struct acpi_device_id smo8800_ids[] = {
        { "SMO8831", 0 },
        { "", 0 },
 };
-
 MODULE_DEVICE_TABLE(acpi, smo8800_ids);
 
-static struct acpi_driver smo8800_driver = {
-       .name = DRIVER_NAME,
-       .class = "Latitude",
-       .ids = smo8800_ids,
-       .ops = {
-               .add = smo8800_add,
-               .remove = smo8800_remove,
+static struct platform_driver smo8800_driver = {
+       .probe = smo8800_probe,
+       .remove = smo8800_remove,
+       .driver = {
+               .name = DRIVER_NAME,
+               .acpi_match_table = smo8800_ids,
        },
-       .owner = THIS_MODULE,
 };
-
-module_acpi_driver(smo8800_driver);
+module_platform_driver(smo8800_driver);
 
 MODULE_DESCRIPTION("Dell Latitude freefall driver (ACPI SMO88XX)");
 MODULE_LICENSE("GPL");