[PATCH] Floppy: Add cmos attribute to floppy driver

Currently only a device 'fdX' shows up in sysfs; the other possible
device for this drive (like fd0h1440 etc) must be guessed from there.

This patch corrects the floppy driver to create a platform device for
each floppy found; each platform device also has an attribute 'cmos'
which represents the cmos type for this drive. From this attribute the
other possible device types can be computed.

From: Hannes Reinecke <hare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 29 insertions, 13 deletions

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index f0c1084b840f..21f58c4b3c79 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -493,6 +493,8 @@ static struct floppy_struct user_params[N_DRIVE];
 
 static sector_t floppy_sizes[256];
 
+static char floppy_device_name[] = "floppy";
+
 /*
  * The driver is trying to determine the correct media format
  * while probing is set. rw_interrupt() clears it after a
@@ -4191,18 +4193,25 @@ static int __init floppy_setup(char *str)
 
 static int have_no_fdc = -ENODEV;
 
+static ssize_t floppy_cmos_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct platform_device *p = container_of(dev,struct platform_device,dev);
+        int drive = p->id;
+        ssize_t retval;
+
+        retval = sprintf(buf,"%X\n", UDP->cmos);
+
+        return retval;
+}
+
+DEVICE_ATTR(cmos,S_IRUGO,floppy_cmos_show,NULL);
+
 static void floppy_device_release(struct device *dev)
 {
         complete(&device_release);
 }
 
-static struct platform_device floppy_device = {
-        .name           = "floppy",
-        .id             = 0,
-        .dev            = {
-                        .release = floppy_device_release,
-                        }
-};
+static struct platform_device floppy_device[N_DRIVE];
 
 static struct kobject *floppy_find(dev_t dev, int *part, void *data)
 {
@@ -4370,20 +4379,26 @@ static int __init floppy_init(void)
                 goto out_flush_work;
         }
 
-        err = platform_device_register(&floppy_device);
-        if (err)
-                goto out_flush_work;
-
         for (drive = 0; drive < N_DRIVE; drive++) {
                 if (!(allowed_drive_mask & (1 << drive)))
                         continue;
                 if (fdc_state[FDC(drive)].version == FDC_NONE)
                         continue;
+
+                floppy_device[drive].name = floppy_device_name;
+                floppy_device[drive].id = drive;
+                floppy_device[drive].dev.release = floppy_device_release;
+
+                err = platform_device_register(&floppy_device[drive]);
+                if (err)
+                        goto out_flush_work;
+
+                device_create_file(&floppy_device[drive].dev,&dev_attr_cmos);
                 /* to be cleaned up... */
                 disks[drive]->private_data = (void *)(long)drive;
                 disks[drive]->queue = floppy_queue;
                 disks[drive]->flags |= GENHD_FL_REMOVABLE;
-                disks[drive]->driverfs_dev = &floppy_device.dev;
+                disks[drive]->driverfs_dev = &floppy_device[drive].dev;
                 add_disk(disks[drive]);
         }
 
@@ -4603,10 +4618,11 @@ void cleanup_module(void)
                     fdc_state[FDC(drive)].version != FDC_NONE) {
                         del_gendisk(disks[drive]);
                         unregister_devfs_entries(drive);
+                        device_remove_file(&floppy_device[drive].dev, &dev_attr_cmos);
+                        platform_device_unregister(&floppy_device[drive]);
                 }
                 put_disk(disks[drive]);
         }
-        platform_device_unregister(&floppy_device);
         devfs_remove("floppy");
 
         del_timer_sync(&fd_timeout);