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SubjectRe: [PATCH] PnP update - drivers
On Sun, Jan 12, 2003 at 08:30:57PM +0100, Jaroslav Kysela wrote:
> Hi,
>
> this patch must be applied after PnP patch v0.94. It contains my
> small cleanups of PnP code and I tried to rewrite almost all ISA PnP
> drivers to new PnP subsystem except sound drivers (ALSA & OSS). Please,
> apply to get away compilation problems.
>
> Jaroslav


Hi Jaroslav,

Next time send pnp related changes to me directly. I would have been happy
to include your work after I carefully reviewed it. I was planning to merge
a very large resource algorithm improvement soon, but now because of these
changes, that I do not even necessarily agree with, I will be unable to
include this major improvement and bug fix for a while. Furthermore many
people of whom are counting on me to merge thier patches will now be
dissappointed to hear that their changes, many of which are critical for
certain pnp hardware configurations will be delayed.

Although I am glad to see the drivers converted, this has been done in a way
that is not desirable. They use compat.c which was intended as a temporary
solution. In fact I may even remove compat.c all together. This has been
clearly stated in both the file compat.c and pnp.txt documentation.
Attached is a copy of Zwane's ide conversion patch against 2.5.56. It can be
used as an example of a correct driver conversion. Notice how it is fully
integrated into the driver model as all drivers should be.

I'm now unhappy with the current pnp code and will most likely revert all pnp
changes between 2.5.56 and 2.5.57 to avoid a merging nightmare. I will then
carefully remerge what I feel is acceptable.

Once again, I'm sorry to those who will be unable to use thier systems due to
this major set back. All pnp changes should be sent to me and me only. I
believe these pnp change conflicts can easily be worked out with better
communication. I intend to make a better effort in the future to explain my
goals and I hope that you will do the same. I appreciate your work with the
pnp layer.

Sincerely,

Adam Belay
Linux Plug and Play Maintainer





===================================================================
PnP IDE Conversion from Zwane Mwaikambo



Index: linux-2.5.56/drivers/ide/ide-pnp.c
===================================================================
RCS file: /build/cvsroot/linux-2.5.56/drivers/ide/ide-pnp.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 ide-pnp.c
--- linux-2.5.56/drivers/ide/ide-pnp.c 16 Dec 2002 05:16:23 -0000 1.1.1.1
+++ linux-2.5.56/drivers/ide/ide-pnp.c 16 Dec 2002 08:30:39 -0000
@@ -18,13 +18,11 @@

#include <linux/ide.h>
#include <linux/init.h>
-
-#include <linux/isapnp.h>
+#include <linux/pnp.h>

#define DEV_IO(dev, index) (dev->resource[index].start)
#define DEV_IRQ(dev, index) (dev->irq_resource[index].start)
-
-#define DEV_NAME(dev) (dev->bus->name ? dev->bus->name : "ISA PnP")
+#define DEV_NAME(dev) (dev->protocol->name ? dev->protocol->name : "ISA PnP")

#define GENERIC_HD_DATA 0
#define GENERIC_HD_ERROR 1
@@ -35,125 +33,125 @@
#define GENERIC_HD_SELECT 6
#define GENERIC_HD_STATUS 7

-static int generic_ide_offsets[IDE_NR_PORTS] __initdata = {
+static int generic_ide_offsets[IDE_NR_PORTS] = {
GENERIC_HD_DATA, GENERIC_HD_ERROR, GENERIC_HD_NSECTOR,
GENERIC_HD_SECTOR, GENERIC_HD_LCYL, GENERIC_HD_HCYL,
GENERIC_HD_SELECT, GENERIC_HD_STATUS, -1, -1
};

/* ISA PnP device table entry */
-struct pnp_dev_t {
- unsigned short card_vendor, card_device, vendor, device;
- int (*init_fn)(struct pci_dev *dev, int enable);
+struct idepnp_private {
+ struct pnp_dev *dev;
+ struct pci_dev pci_dev; /* we need this for the upper layers */
+ int (*init_fn)(struct idepnp_private *device, int enable);
};

-/* Generic initialisation function for ISA PnP IDE interface */
+/* Barf bags at the ready! Enough to satisfy IDE core */
+static void pnp_to_pci(struct pnp_dev *pnp_dev, struct pci_dev *pci_dev)
+{
+ pci_dev->dev = pnp_dev->dev;
+ pci_set_drvdata(pci_dev, pnp_get_drvdata(pnp_dev));
+ pci_dev->irq = DEV_IRQ(pnp_dev, 0);
+ pci_set_dma_mask(pci_dev, 0x00ffffff);
+}

-static int __init pnpide_generic_init(struct pci_dev *dev, int enable)
+/* Generic initialisation function for ISA PnP IDE interface */
+static int pnpide_generic_init(struct idepnp_private *device, int enable)
{
hw_regs_t hw;
ide_hwif_t *hwif;
int index;
+ struct pnp_dev *dev = device->dev;

- if (!enable)
+ if (!enable) {
+ /* nothing to do for now */
return 0;
+ }

if (!(DEV_IO(dev, 0) && DEV_IO(dev, 1) && DEV_IRQ(dev, 0)))
- return 1;
+ return -EINVAL;

ide_setup_ports(&hw, (ide_ioreg_t) DEV_IO(dev, 0),
generic_ide_offsets,
(ide_ioreg_t) DEV_IO(dev, 1),
0, NULL,
-// generic_pnp_ide_iops,
+ /* generic_pnp_ide_iops, */
DEV_IRQ(dev, 0));

index = ide_register_hw(&hw, &hwif);

if (index != -1) {
printk(KERN_INFO "ide%d: %s IDE interface\n", index, DEV_NAME(dev));
- hwif->pci_dev = dev;
+ hwif->pci_dev = &device->pci_dev;
return 0;
}

- return 1;
+ return -ENODEV;
}

/* Add your devices here :)) */
-struct pnp_dev_t idepnp_devices[] __initdata = {
- /* Generic ESDI/IDE/ATA compatible hard disk controller */
- { ISAPNP_ANY_ID, ISAPNP_ANY_ID,
- ISAPNP_VENDOR('P', 'N', 'P'), ISAPNP_DEVICE(0x0600),
- pnpide_generic_init },
- { 0 }
+#define IDEPNP_GENERIC_INIT 0
+static const struct pnp_device_id pnp_ide_devs[] = {
+ /* Generic ESDI/IDE/ATA compatible hard disk controller */
+ {"PNP0600", IDEPNP_GENERIC_INIT},
+ {"", 0}
};

#define NR_PNP_DEVICES 8
-struct pnp_dev_inst {
- struct pci_dev *dev;
- struct pnp_dev_t *dev_type;
-};
-static struct pnp_dev_inst devices[NR_PNP_DEVICES];
-static int pnp_ide_dev_idx = 0;
+/* Nb. pnpide_generic_init is indexed as IDEPNP_GENERIC_INIT */
+static int (*init_functions[])(struct idepnp_private *device, int enable) = {pnpide_generic_init};
+static struct idepnp_private devices[NR_PNP_DEVICES];
+static int pnp_ide_dev_idx;

/*
* Probe for ISA PnP IDE interfaces.
*/
-
-void __init pnpide_init(int enable)
+static int pnp_ide_probe(struct pnp_dev *pdev, const struct pnp_device_id *dev_id)
{
- struct pci_dev *dev = NULL;
- struct pnp_dev_t *dev_type;
+ int ret;
+ struct idepnp_private *p;

- if (!isapnp_present())
- return;
+ /*
+ * Register device in the array to
+ * deactivate it on a module unload.
+ */
+ if (pnp_ide_dev_idx >= NR_PNP_DEVICES)
+ return -ENOSPC;
+
+ p = &devices[pnp_ide_dev_idx];
+ p->init_fn = init_functions[dev_id->driver_data];
+ p->dev = pdev;
+ pnp_set_drvdata(pdev, p);
+ pnp_to_pci(p->dev, &p->pci_dev);
+ ret = p->init_fn(p, 1);
+ if (!ret)
+ pnp_ide_dev_idx++;
+
+ return ret;
+}

- /* Module unload, deactivate all registered devices. */
- if (!enable) {
- int i;
- for (i = 0; i < pnp_ide_dev_idx; i++) {
- dev = devices[i].dev;
- devices[i].dev_type->init_fn(dev, 0);
- if (dev->deactivate)
- dev->deactivate(dev);
- }
- return;
- }
+static void pnp_ide_remove(struct pnp_dev *dev)
+{
+ struct idepnp_private *p = pnp_get_drvdata(dev);
+
+ /* if p is null you have a bug elsewhere */
+ p->init_fn(p, 0);
+ pnp_ide_dev_idx--;
+ return;
+}

- for (dev_type = idepnp_devices; dev_type->vendor; dev_type++) {
- while ((dev = isapnp_find_dev(NULL, dev_type->vendor,
- dev_type->device, dev))) {
-
- if (dev->active)
- continue;
-
- if (dev->prepare && dev->prepare(dev) < 0) {
- printk(KERN_ERR"ide-pnp: %s prepare failed\n", DEV_NAME(dev));
- continue;
- }
-
- if (dev->activate && dev->activate(dev) < 0) {
- printk(KERN_ERR"ide: %s activate failed\n", DEV_NAME(dev));
- continue;
- }
-
- /* Call device initialization function */
- if (dev_type->init_fn(dev, 1)) {
- if (dev->deactivate(dev))
- dev->deactivate(dev);
- } else {
-#ifdef MODULE
- /*
- * Register device in the array to
- * deactivate it on a module unload.
- */
- if (pnp_ide_dev_idx >= NR_PNP_DEVICES)
- return;
- devices[pnp_ide_dev_idx].dev = dev;
- devices[pnp_ide_dev_idx].dev_type = dev_type;
- pnp_ide_dev_idx++;
-#endif
- }
- }
- }
+static struct pnp_driver idepnp_driver = {
+ .name = "ide-pnp",
+ .id_table = pnp_ide_devs,
+ .probe = pnp_ide_probe,
+ .remove = pnp_ide_remove
+};
+
+void pnpide_init(int enable)
+{
+ if (enable)
+ pnp_register_driver(&idepnp_driver);
+ else
+ pnp_unregister_driver(&idepnp_driver);
}
+
Index: linux-2.5.56/drivers/ide/ide.c
===================================================================
RCS file: /build/cvsroot/linux-2.5.56/drivers/ide/ide.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 ide.c
--- linux-2.5.56/drivers/ide/ide.c 16 Dec 2002 05:16:22 -0000 1.1.1.1
+++ linux-2.5.56/drivers/ide/ide.c 16 Dec 2002 08:52:17 -0000
@@ -2080,7 +2080,7 @@
buddha_init();
}
#endif /* CONFIG_BLK_DEV_BUDDHA */
-#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP)
+#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_PNP)
{
extern void pnpide_init(int enable);
pnpide_init(1);
@@ -2256,7 +2256,7 @@
spin_unlock_irqrestore(&ide_lock, flags);
return 1;
}
-#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_ISAPNP) && defined(MODULE)
+#if defined(CONFIG_BLK_DEV_ISAPNP) && defined(CONFIG_PNP) && defined(MODULE)
pnpide_init(0);
#endif /* CONFIG_BLK_DEV_ISAPNP */
#ifdef CONFIG_PROC_FS
-
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