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PNP: add pnp_possible_config() -- can a device could be configured this way? 

As part of a heuristic to identify modem devices, 8250_pnp.c
checks to see whether a device can be configured at any of the
legacy COM port addresses.

This patch moves the code that traverses the PNP "possible resource
options" from 8250_pnp.c to the PNP subsystem.  This encapsulation
is important because a future patch will change the implementation
of those resource options.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2008-06-27 16:57:01 -06:00 committed by Andi Kleen
parent f61ed7e32d
commit 57fd51a8be
3 changed files with 74 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/pnp/resource.c
View File

@ -624,6 +624,68 @@ struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
return pnp_res;
}
static int pnp_possible_option(struct pnp_option *option, int type,
resource_size_t start, resource_size_t size)
{
struct pnp_option *tmp;
struct pnp_port *port;
struct pnp_mem *mem;
struct pnp_irq *irq;
struct pnp_dma *dma;
if (!option)
return 0;
for (tmp = option; tmp; tmp = tmp->next) {
switch (type) {
case IORESOURCE_IO:
for (port = tmp->port; port; port = port->next) {
if (port->min == start && port->size == size)
return 1;
}
break;
case IORESOURCE_MEM:
for (mem = tmp->mem; mem; mem = mem->next) {
if (mem->min == start && mem->size == size)
return 1;
}
break;
case IORESOURCE_IRQ:
for (irq = tmp->irq; irq; irq = irq->next) {
if (start < PNP_IRQ_NR &&
test_bit(start, irq->map))
return 1;
}
break;
case IORESOURCE_DMA:
for (dma = tmp->dma; dma; dma = dma->next) {
if (dma->map & (1 << start))
return 1;
}
break;
}
}
return 0;
}
/*
* Determine whether the specified resource is a possible configuration
* for this device.
*/
int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
resource_size_t size)
{
if (pnp_possible_option(dev->independent, type, start, size))
return 1;
if (pnp_possible_option(dev->dependent, type, start, size))
return 1;
return 0;
}
EXPORT_SYMBOL(pnp_possible_config);
/* format is: pnp_reserve_irq=irq1[,irq2] .... */
static int __init pnp_setup_reserve_irq(char *str)
{

24
drivers/serial/8250_pnp.c
View File

@ -383,21 +383,14 @@ static int __devinit check_name(char *name)
return 0;
}
static int __devinit check_resources(struct pnp_option *option)
static int __devinit check_resources(struct pnp_dev *dev)
{
struct pnp_option *tmp;
if (!option)
return 0;
resource_size_t base[] = {0x2f8, 0x3f8, 0x2e8, 0x3e8};
int i;
for (tmp = option; tmp; tmp = tmp->next) {
struct pnp_port *port;
for (port = tmp->port; port; port = port->next)
if ((port->size == 8) &&
((port->min == 0x2f8) ||
(port->min == 0x3f8) ||
(port->min == 0x2e8) ||
(port->min == 0x3e8)))
return 1;
for (i = 0; i < ARRAY_SIZE(base); i++) {
if (pnp_possible_config(dev, IORESOURCE_IO, base[i], 8))
return 1;
}
return 0;
@ -420,10 +413,7 @@ static int __devinit serial_pnp_guess_board(struct pnp_dev *dev, int *flags)
(dev->card && check_name(dev->card->name))))
return -ENODEV;
if (check_resources(dev->independent))
return 0;
if (check_resources(dev->dependent))
if (check_resources(dev))
return 0;
return -ENODEV;

5
include/linux/pnp.h
View File

@ -479,6 +479,8 @@ void pnp_unregister_card_driver(struct pnp_card_driver *drv);
extern struct list_head pnp_cards;
/* resource management */
int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t base,
resource_size_t size);
int pnp_auto_config_dev(struct pnp_dev *dev);
int pnp_start_dev(struct pnp_dev *dev);
int pnp_stop_dev(struct pnp_dev *dev);
@ -506,6 +508,9 @@ static inline int pnp_register_card_driver(struct pnp_card_driver *drv) { return
static inline void pnp_unregister_card_driver(struct pnp_card_driver *drv) { }
/* resource management */
static inline int pnp_possible_config(struct pnp_dev *dev, int type,
resource_size_t base,
resource_size_t size) { return 0; }
static inline int pnp_auto_config_dev(struct pnp_dev *dev) { return -ENODEV; }
static inline int pnp_start_dev(struct pnp_dev *dev) { return -ENODEV; }
static inline int pnp_stop_dev(struct pnp_dev *dev) { return -ENODEV; }