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Subject[patch 5/6] dcdbas: convert to the new platform device interface
dcdbas: convert to the new platform device interface

Do not use platform_device_register_simple() as it is going away,
define dcdbas_driver and implement ->probe() and ->remove() functions
so manual binding and unbinding will work with this driver.

Also switch to using attribute_group when creating sysfs attributes
and make sure to check and handle errors; explicitely remove attributes
when detaching driver.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/firmware/dcdbas.c | 110 ++++++++++++++++++++++++++++++++++++----------
1 files changed, 87 insertions(+), 23 deletions(-)
Index: work/drivers/firmware/dcdbas.c
===================================================================
--- work.orig/drivers/firmware/dcdbas.c
+++ work/drivers/firmware/dcdbas.c
@@ -530,30 +530,27 @@ static DCDBAS_DEV_ATTR_RW(host_control_a
static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);

-static struct device_attribute *dcdbas_dev_attrs[] = {
- &dev_attr_smi_data_buf_size,
- &dev_attr_smi_data_buf_phys_addr,
- &dev_attr_smi_request,
- &dev_attr_host_control_action,
- &dev_attr_host_control_smi_type,
- &dev_attr_host_control_on_shutdown,
+static struct attribute *dcdbas_dev_attrs[] = {
+ &dev_attr_smi_data_buf_size.attr,
+ &dev_attr_smi_data_buf_phys_addr.attr,
+ &dev_attr_smi_request.attr,
+ &dev_attr_host_control_action.attr,
+ &dev_attr_host_control_smi_type.attr,
+ &dev_attr_host_control_on_shutdown.attr,
NULL
};

-/**
- * dcdbas_init: initialize driver
- */
-static int __init dcdbas_init(void)
+static struct attribute_group dcdbas_attr_group = {
+ .attrs = dcdbas_dev_attrs,
+};
+
+static int __devinit dcdbas_probe(struct platform_device *dev)
{
- int i;
+ int i, error;

host_control_action = HC_ACTION_NONE;
host_control_smi_type = HC_SMITYPE_NONE;

- dcdbas_pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
- if (IS_ERR(dcdbas_pdev))
- return PTR_ERR(dcdbas_pdev);
-
/*
* BIOS SMI calls require buffer addresses be in 32-bit address space.
* This is done by setting the DMA mask below.
@@ -561,19 +558,79 @@ static int __init dcdbas_init(void)
dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;

+ error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
+ if (error)
+ return error;
+
+ for (i = 0; dcdbas_bin_attrs[i]; i++) {
+ error = sysfs_create_bin_file(&dev->dev.kobj,
+ dcdbas_bin_attrs[i]);
+ if (error) {
+ while (--i >= 0)
+ sysfs_remove_bin_file(&dev->dev.kobj,
+ dcdbas_bin_attrs[i]);
+ sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
+ return error;
+ }
+ }
+
register_reboot_notifier(&dcdbas_reboot_nb);

+ dev_info(&dev->dev, "%s (version %s)\n",
+ DRIVER_DESCRIPTION, DRIVER_VERSION);
+
+ return 0;
+}
+
+static int __devexit dcdbas_remove(struct platform_device *dev)
+{
+ int i;
+
+ unregister_reboot_notifier(&dcdbas_reboot_nb);
for (i = 0; dcdbas_bin_attrs[i]; i++)
- sysfs_create_bin_file(&dcdbas_pdev->dev.kobj,
- dcdbas_bin_attrs[i]);
+ sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
+ sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);

- for (i = 0; dcdbas_dev_attrs[i]; i++)
- device_create_file(&dcdbas_pdev->dev, dcdbas_dev_attrs[i]);
+ return 0;
+}

- dev_info(&dcdbas_pdev->dev, "%s (version %s)\n",
- DRIVER_DESCRIPTION, DRIVER_VERSION);
+static struct platform_driver dcdbas_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = dcdbas_probe,
+ .remove = __devexit_p(dcdbas_remove),
+};
+
+/**
+ * dcdbas_init: initialize driver
+ */
+static int __init dcdbas_init(void)
+{
+ int error;
+
+ error = platform_driver_register(&dcdbas_driver);
+ if (error)
+ return error;
+
+ dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
+ if (!dcdbas_pdev) {
+ error = -ENOMEM;
+ goto err_unregister_driver;
+ }
+
+ error = platform_device_add(dcdbas_pdev);
+ if (error)
+ goto err_free_device;

return 0;
+
+ err_free_device:
+ platform_device_put(dcdbas_pdev);
+ err_unregister_driver:
+ platform_driver_unregister(&dcdbas_driver);
+ return error;
}

/**
@@ -582,7 +639,14 @@ static int __init dcdbas_init(void)
static void __exit dcdbas_exit(void)
{
platform_device_unregister(dcdbas_pdev);
- unregister_reboot_notifier(&dcdbas_reboot_nb);
+ platform_driver_unregister(&dcdbas_driver);
+
+ /*
+ * We have to free the buffer here instead of dcdbas_remove
+ * because only in module exit function we can be sure that
+ * all sysfs attributes belonging to this module have been
+ * released.
+ */
smi_data_buf_free();
}

-
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