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>
diff --git a/drivers/pnp/resource.c b/drivers/pnp/resource.c
index ff79aa6..786fd35 100644
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -624,6 +624,68 @@
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)
{
diff --git a/drivers/serial/8250_pnp.c b/drivers/serial/8250_pnp.c
index 97c68d02..638b686 100644
--- a/drivers/serial/8250_pnp.c
+++ b/drivers/serial/8250_pnp.c
@@ -383,21 +383,14 @@
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 @@
(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;
diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index dfaa567..e033e1b 100644
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -479,6 +479,8 @@
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 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; }