[patch 2.6.21-rc5 1/3] parport->dev driver model support

From: David Brownell
Date: Mon Mar 26 2007 - 12:40:48 EST

Currently a parport_driver can't get a handle on the device node for the
underlying parport (PNPACPI, PCI, etc). That prevents correct placement
of sysfs child nodes, which can affect things like power management.

This patch adds a field to "struct parport" pointing to that device node,
and updates non-legacy port drivers to initialize that device pointer.
That field replaces the analagous PCI-only support in parport_pc.

Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
---
NOTE this depends on an earlier patch to make pnp devices set up DMA,
parport is the primary user of legacy i8237 dma infrastructure.

drivers/parport/parport_cs.c | 2 +-
drivers/parport/parport_mfc3.c | 1 +
drivers/parport/parport_pc.c | 31 +++++++++++++++++--------------
drivers/parport/parport_serial.c | 2 +-
drivers/parport/parport_sunbpp.c | 1 +
drivers/parport/share.c | 5 +++++
include/linux/parport.h | 8 ++++++--
include/linux/parport_pc.h | 3 +--
8 files changed, 33 insertions(+), 20 deletions(-)

Index: g26/include/linux/parport.h
===================================================================
--- g26.orig/include/linux/parport.h 2007-02-24 01:19:37.000000000 -0800
+++ g26/include/linux/parport.h 2007-02-24 01:24:19.000000000 -0800
@@ -279,6 +279,10 @@ struct parport {
int dma;
int muxport; /* which muxport (if any) this is */
int portnum; /* which physical parallel port (not mux) */
+ struct device *dev; /* Physical device associated with IO/DMA.
+ * This may unfortulately be null if the
+ * port has a legacy driver.
+ */

struct parport *physport;
/* If this is a non-default mux
@@ -289,7 +293,7 @@ struct parport {
following structure members are
meaningless: devices, cad, muxsel,
waithead, waittail, flags, pdir,
- ieee1284, *_lock.
+ dev, ieee1284, *_lock.

It this is a default mux parport, or
there is no mux involved, this points to
@@ -302,7 +306,7 @@ struct parport {

struct pardevice *waithead;
struct pardevice *waittail;
-
+
struct list_head list;
unsigned int flags;

Index: g26/include/linux/parport_pc.h
===================================================================
--- g26.orig/include/linux/parport_pc.h 2007-02-24 01:19:37.000000000 -0800
+++ g26/include/linux/parport_pc.h 2007-02-24 01:24:19.000000000 -0800
@@ -38,7 +38,6 @@ struct parport_pc_private {
/* buffer suitable for DMA, if DMA enabled */
char *dma_buf;
dma_addr_t dma_handle;
- struct pci_dev *dev;
struct list_head list;
struct parport *port;
};
@@ -232,7 +231,7 @@ extern int parport_pc_claim_resources(st
extern struct parport *parport_pc_probe_port (unsigned long base,
unsigned long base_hi,
int irq, int dma,
- struct pci_dev *dev);
+ struct device *dev);
extern void parport_pc_unregister_port (struct parport *p);

#endif
Index: g26/drivers/parport/parport_pc.c
===================================================================
--- g26.orig/drivers/parport/parport_pc.c 2007-02-24 01:19:37.000000000 -0800
+++ g26/drivers/parport/parport_pc.c 2007-02-28 12:40:30.000000000 -0800
@@ -620,6 +620,7 @@ static size_t parport_pc_fifo_write_bloc
unsigned long dmaflag;
size_t left = length;
const struct parport_pc_private *priv = port->physport->private_data;
+ struct device *dev = port->physport->dev;
dma_addr_t dma_addr, dma_handle;
size_t maxlen = 0x10000; /* max 64k per DMA transfer */
unsigned long start = (unsigned long) buf;
@@ -631,8 +632,8 @@ dump_parport_state ("enter fifo_write_bl
if ((start ^ end) & ~0xffffUL)
maxlen = 0x10000 - (start & 0xffff);

- dma_addr = dma_handle = pci_map_single(priv->dev, (void *)buf, length,
- PCI_DMA_TODEVICE);
+ dma_addr = dma_handle = dma_map_single(dev, (void *)buf, length,
+ DMA_TO_DEVICE);
} else {
/* above 16 MB we use a bounce buffer as ISA-DMA is not possible */
maxlen = PAGE_SIZE; /* sizeof(priv->dma_buf) */
@@ -728,9 +729,9 @@ dump_parport_state ("enter fifo_write_bl

/* Turn off DMA mode */
frob_econtrol (port, 1<<3, 0);
-
+
if (dma_handle)
- pci_unmap_single(priv->dev, dma_handle, length, PCI_DMA_TODEVICE);
+ dma_unmap_single(dev, dma_handle, length, DMA_TO_DEVICE);

dump_parport_state ("leave fifo_write_block_dma", port);
return length - left;
@@ -2146,7 +2147,7 @@ static DEFINE_SPINLOCK(ports_lock);
struct parport *parport_pc_probe_port (unsigned long int base,
unsigned long int base_hi,
int irq, int dma,
- struct pci_dev *dev)
+ struct device *dev)
{
struct parport_pc_private *priv;
struct parport_operations *ops;
@@ -2180,9 +2181,10 @@ struct parport *parport_pc_probe_port (u
priv->fifo_depth = 0;
priv->dma_buf = NULL;
priv->dma_handle = 0;
- priv->dev = dev;
INIT_LIST_HEAD(&priv->list);
priv->port = p;
+
+ p->dev = dev;
p->base_hi = base_hi;
p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
p->private_data = priv;
@@ -2305,9 +2307,10 @@ struct parport *parport_pc_probe_port (u
p->dma = PARPORT_DMA_NONE;
} else {
priv->dma_buf =
- pci_alloc_consistent(priv->dev,
+ dma_alloc_coherent(dev,
PAGE_SIZE,
- &priv->dma_handle);
+ &priv->dma_handle,
+ GFP_KERNEL);
if (! priv->dma_buf) {
printk (KERN_WARNING "%s: "
"cannot get buffer for DMA, "
@@ -2383,7 +2386,7 @@ void parport_pc_unregister_port (struct
release_region(p->base_hi, 3);
#if defined(CONFIG_PARPORT_PC_FIFO) && defined(HAS_DMA)
if (priv->dma_buf)
- pci_free_consistent(priv->dev, PAGE_SIZE,
+ dma_free_coherent(p->physport->dev, PAGE_SIZE,
priv->dma_buf,
priv->dma_handle);
#endif
@@ -2489,7 +2492,7 @@ static int __devinit sio_ite_8872_probe
*/
release_resource(base_res);
if (parport_pc_probe_port (ite8872_lpt, ite8872_lpthi,
- irq, PARPORT_DMA_NONE, NULL)) {
+ irq, PARPORT_DMA_NONE, &pdev->dev)) {
printk (KERN_INFO
"parport_pc: ITE 8872 parallel port: io=0x%X",
ite8872_lpt);
@@ -2672,7 +2675,7 @@ static int __devinit sio_via_probe (stru
}

/* finally, do the probe with values obtained */
- if (parport_pc_probe_port (port1, port2, irq, dma, NULL)) {
+ if (parport_pc_probe_port (port1, port2, irq, dma, &pdev->dev)) {
printk (KERN_INFO
"parport_pc: VIA parallel port: io=0x%X", port1);
if (irq != PARPORT_IRQ_NONE)
@@ -2970,7 +2973,7 @@ static int parport_pc_pci_probe (struct
parport_pc_pci_tbl[i + last_sio].device, io_lo, io_hi);
data->ports[count] =
parport_pc_probe_port (io_lo, io_hi, PARPORT_IRQ_NONE,
- PARPORT_DMA_NONE, dev);
+ PARPORT_DMA_NONE, &dev->dev);
if (data->ports[count])
count++;
}
@@ -3077,8 +3080,8 @@ static int parport_pc_pnp_probe(struct p
} else
dma = PARPORT_DMA_NONE;

- printk(KERN_INFO "parport: PnPBIOS parport detected.\n");
- if (!(pdata = parport_pc_probe_port (io_lo, io_hi, irq, dma, NULL)))
+ dev_info(&dev->dev, "reported by %s\n", dev->protocol->name);
+ if (!(pdata = parport_pc_probe_port (io_lo, io_hi, irq, dma, &dev->dev)))
return -ENODEV;

pnp_set_drvdata(dev,pdata);
Index: g26/drivers/parport/share.c
===================================================================
--- g26.orig/drivers/parport/share.c 2007-02-24 01:19:37.000000000 -0800
+++ g26/drivers/parport/share.c 2007-02-24 01:24:19.000000000 -0800
@@ -365,6 +365,11 @@ void parport_announce_port (struct parpo
parport_daisy_init(port);
#endif

+ if (!port->dev)
+ printk(KERN_WARNING "%s: fix this legacy "
+ "no-device port driver!\n",
+ port->name);
+
parport_proc_register(port);
mutex_lock(&registration_lock);
spin_lock_irq(&parportlist_lock);
Index: g26/drivers/parport/parport_mfc3.c
===================================================================
--- g26.orig/drivers/parport/parport_mfc3.c 2007-02-24 01:19:37.000000000 -0800
+++ g26/drivers/parport/parport_mfc3.c 2007-02-24 01:24:19.000000000 -0800
@@ -356,6 +356,7 @@ static int __init parport_mfc3_init(void
if (request_irq(IRQ_AMIGA_PORTS, mfc3_interrupt, IRQF_SHARED, p->name, &pp_mfc3_ops))
goto out_irq;
}
+ p->dev = &z->dev;

this_port[pias++] = p;
printk(KERN_INFO "%s: Multiface III port using irq\n", p->name);
Index: g26/drivers/parport/parport_sunbpp.c
===================================================================
--- g26.orig/drivers/parport/parport_sunbpp.c 2007-02-24 01:19:37.000000000 -0800
+++ g26/drivers/parport/parport_sunbpp.c 2007-02-24 01:24:19.000000000 -0800
@@ -320,6 +320,7 @@ static int __devinit init_one_port(struc
goto out_free_ops;

p->size = size;
+ p->dev = &sdev->ofdev.dev;

if ((err = request_irq(p->irq, parport_sunbpp_interrupt,
IRQF_SHARED, p->name, p)) != 0) {
Index: g26/drivers/parport/parport_serial.c
===================================================================
--- g26.orig/drivers/parport/parport_serial.c 2007-02-24 01:19:37.000000000 -0800
+++ g26/drivers/parport/parport_serial.c 2007-02-24 01:24:19.000000000 -0800
@@ -305,7 +305,7 @@ static int __devinit parport_register (s
dev_dbg(&dev->dev, "PCI parallel port detected: I/O at "
"%#lx(%#lx)\n", io_lo, io_hi);
port = parport_pc_probe_port (io_lo, io_hi, PARPORT_IRQ_NONE,
- PARPORT_DMA_NONE, dev);
+ PARPORT_DMA_NONE, &dev->dev);
if (port) {
priv->port[priv->num_par++] = port;
success = 1;
Index: g26/drivers/parport/parport_cs.c
===================================================================
--- g26.orig/drivers/parport/parport_cs.c 2007-02-15 18:17:20.000000000 -0800
+++ g26/drivers/parport/parport_cs.c 2007-02-24 13:31:00.000000000 -0800
@@ -201,7 +201,7 @@ static int parport_config(struct pcmcia_

p = parport_pc_probe_port(link->io.BasePort1, link->io.BasePort2,
link->irq.AssignedIRQ, PARPORT_DMA_NONE,
- NULL);
+ &link->dev);
if (p == NULL) {
printk(KERN_NOTICE "parport_cs: parport_pc_probe_port() at "
"0x%3x, irq %u failed\n", link->io.BasePort1,
-
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