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 (file)
--- a/drivers/pnp/resource.c
+++ b/drivers/pnp/resource.c
@@ -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)
 {

diff --git a/drivers/serial/8250_pnp.c b/drivers/serial/8250_pnp.c
index 97c68d0..638b686 100644 (file)
--- a/drivers/serial/8250_pnp.c
+++ b/drivers/serial/8250_pnp.c
@@ -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;

diff --git a/include/linux/pnp.h b/include/linux/pnp.h
index dfaa567..e033e1b 100644 (file)
--- a/include/linux/pnp.h
+++ b/include/linux/pnp.h
@@ -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; }