PNP: remove redundant pnp_can_configure() check
[linux-2.6.git] / drivers / pnp / support.c
1 /*
2  * support.c - standard functions for the use of pnp protocol drivers
3  *
4  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
5  */
6
7 #include <linux/module.h>
8 #include <linux/ctype.h>
9 #include <linux/pnp.h>
10 #include "base.h"
11
12 /**
13  * pnp_is_active - Determines if a device is active based on its current
14  *      resources
15  * @dev: pointer to the desired PnP device
16  */
17 int pnp_is_active(struct pnp_dev *dev)
18 {
19         /*
20          * I don't think this is very reliable because pnp_disable_dev()
21          * only clears out auto-assigned resources.
22          */
23         if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
24             !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
25             pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
26                 return 0;
27         else
28                 return 1;
29 }
30
31 EXPORT_SYMBOL(pnp_is_active);
32
33 /*
34  * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
35  * buried in the ACPI CA, and we can't depend on it being present.
36  */
37 void pnp_eisa_id_to_string(u32 id, char *str)
38 {
39         id = be32_to_cpu(id);
40
41         /*
42          * According to the specs, the first three characters are five-bit
43          * compressed ASCII, and the left-over high order bit should be zero.
44          * However, the Linux ISAPNP code historically used six bits for the
45          * first character, and there seem to be IDs that depend on that,
46          * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
47          * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
48          */
49         str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
50         str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
51         str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
52         str[3] = hex_asc_hi(id >> 8);
53         str[4] = hex_asc_lo(id >> 8);
54         str[5] = hex_asc_hi(id);
55         str[6] = hex_asc_lo(id);
56         str[7] = '\0';
57 }
58
59 char *pnp_resource_type_name(struct resource *res)
60 {
61         switch (pnp_resource_type(res)) {
62         case IORESOURCE_IO:
63                 return "io";
64         case IORESOURCE_MEM:
65                 return "mem";
66         case IORESOURCE_IRQ:
67                 return "irq";
68         case IORESOURCE_DMA:
69                 return "dma";
70         }
71         return NULL;
72 }
73
74 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
75 {
76 #ifdef DEBUG
77         char buf[128];
78         int len = 0;
79         struct pnp_resource *pnp_res;
80         struct resource *res;
81
82         if (list_empty(&dev->resources)) {
83                 dev_dbg(&dev->dev, "%s: no current resources\n", desc);
84                 return;
85         }
86
87         dev_dbg(&dev->dev, "%s: current resources:\n", desc);
88         list_for_each_entry(pnp_res, &dev->resources, list) {
89                 res = &pnp_res->res;
90
91                 len += snprintf(buf + len, sizeof(buf) - len, "  %-3s ",
92                                 pnp_resource_type_name(res));
93
94                 if (res->flags & IORESOURCE_DISABLED) {
95                         dev_dbg(&dev->dev, "%sdisabled\n", buf);
96                         continue;
97                 }
98
99                 switch (pnp_resource_type(res)) {
100                 case IORESOURCE_IO:
101                 case IORESOURCE_MEM:
102                         len += snprintf(buf + len, sizeof(buf) - len,
103                                         "%#llx-%#llx flags %#lx",
104                                         (unsigned long long) res->start,
105                                         (unsigned long long) res->end,
106                                         res->flags);
107                         break;
108                 case IORESOURCE_IRQ:
109                 case IORESOURCE_DMA:
110                         len += snprintf(buf + len, sizeof(buf) - len,
111                                         "%lld flags %#lx",
112                                         (unsigned long long) res->start,
113                                         res->flags);
114                         break;
115                 }
116                 dev_dbg(&dev->dev, "%s\n", buf);
117         }
118 #endif
119 }