[SCSI] zfcp: Cleanup function parameters for sbal value.
[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  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
6  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
7  */
8
9 #include <linux/module.h>
10 #include <linux/ctype.h>
11 #include <linux/pnp.h>
12 #include "base.h"
13
14 /**
15  * pnp_is_active - Determines if a device is active based on its current
16  *      resources
17  * @dev: pointer to the desired PnP device
18  */
19 int pnp_is_active(struct pnp_dev *dev)
20 {
21         /*
22          * I don't think this is very reliable because pnp_disable_dev()
23          * only clears out auto-assigned resources.
24          */
25         if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
26             !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
27             pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
28                 return 0;
29         else
30                 return 1;
31 }
32
33 EXPORT_SYMBOL(pnp_is_active);
34
35 /*
36  * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
37  * buried in the ACPI CA, and we can't depend on it being present.
38  */
39 void pnp_eisa_id_to_string(u32 id, char *str)
40 {
41         id = be32_to_cpu(id);
42
43         /*
44          * According to the specs, the first three characters are five-bit
45          * compressed ASCII, and the left-over high order bit should be zero.
46          * However, the Linux ISAPNP code historically used six bits for the
47          * first character, and there seem to be IDs that depend on that,
48          * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
49          * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
50          */
51         str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
52         str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
53         str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
54         str[3] = hex_asc_hi(id >> 8);
55         str[4] = hex_asc_lo(id >> 8);
56         str[5] = hex_asc_hi(id);
57         str[6] = hex_asc_lo(id);
58         str[7] = '\0';
59 }
60
61 char *pnp_resource_type_name(struct resource *res)
62 {
63         switch (pnp_resource_type(res)) {
64         case IORESOURCE_IO:
65                 return "io";
66         case IORESOURCE_MEM:
67                 return "mem";
68         case IORESOURCE_IRQ:
69                 return "irq";
70         case IORESOURCE_DMA:
71                 return "dma";
72         case IORESOURCE_BUS:
73                 return "bus";
74         }
75         return "unknown";
76 }
77
78 void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
79 {
80         struct pnp_resource *pnp_res;
81
82         if (list_empty(&dev->resources))
83                 pnp_dbg(&dev->dev, "%s: no current resources\n", desc);
84         else {
85                 pnp_dbg(&dev->dev, "%s: current resources:\n", desc);
86                 list_for_each_entry(pnp_res, &dev->resources, list)
87                         pnp_dbg(&dev->dev, "%pr\n", &pnp_res->res);
88         }
89 }
90
91 char *pnp_option_priority_name(struct pnp_option *option)
92 {
93         switch (pnp_option_priority(option)) {
94         case PNP_RES_PRIORITY_PREFERRED:
95                 return "preferred";
96         case PNP_RES_PRIORITY_ACCEPTABLE:
97                 return "acceptable";
98         case PNP_RES_PRIORITY_FUNCTIONAL:
99                 return "functional";
100         }
101         return "invalid";
102 }
103
104 void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
105 {
106         char buf[128];
107         int len = 0, i;
108         struct pnp_port *port;
109         struct pnp_mem *mem;
110         struct pnp_irq *irq;
111         struct pnp_dma *dma;
112
113         if (pnp_option_is_dependent(option))
114                 len += scnprintf(buf + len, sizeof(buf) - len,
115                                  "  dependent set %d (%s) ",
116                                  pnp_option_set(option),
117                                  pnp_option_priority_name(option));
118         else
119                 len += scnprintf(buf + len, sizeof(buf) - len,
120                                  "  independent ");
121
122         switch (option->type) {
123         case IORESOURCE_IO:
124                 port = &option->u.port;
125                 len += scnprintf(buf + len, sizeof(buf) - len, "io  min %#llx "
126                                  "max %#llx align %lld size %lld flags %#x",
127                                  (unsigned long long) port->min,
128                                  (unsigned long long) port->max,
129                                  (unsigned long long) port->align,
130                                  (unsigned long long) port->size, port->flags);
131                 break;
132         case IORESOURCE_MEM:
133                 mem = &option->u.mem;
134                 len += scnprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
135                                  "max %#llx align %lld size %lld flags %#x",
136                                  (unsigned long long) mem->min,
137                                  (unsigned long long) mem->max,
138                                  (unsigned long long) mem->align,
139                                  (unsigned long long) mem->size, mem->flags);
140                 break;
141         case IORESOURCE_IRQ:
142                 irq = &option->u.irq;
143                 len += scnprintf(buf + len, sizeof(buf) - len, "irq");
144                 if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
145                         len += scnprintf(buf + len, sizeof(buf) - len,
146                                          " <none>");
147                 else {
148                         for (i = 0; i < PNP_IRQ_NR; i++)
149                                 if (test_bit(i, irq->map.bits))
150                                         len += scnprintf(buf + len,
151                                                          sizeof(buf) - len,
152                                                          " %d", i);
153                 }
154                 len += scnprintf(buf + len, sizeof(buf) - len, " flags %#x",
155                                  irq->flags);
156                 if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
157                         len += scnprintf(buf + len, sizeof(buf) - len,
158                                          " (optional)");
159                 break;
160         case IORESOURCE_DMA:
161                 dma = &option->u.dma;
162                 len += scnprintf(buf + len, sizeof(buf) - len, "dma");
163                 if (!dma->map)
164                         len += scnprintf(buf + len, sizeof(buf) - len,
165                                          " <none>");
166                 else {
167                         for (i = 0; i < 8; i++)
168                                 if (dma->map & (1 << i))
169                                         len += scnprintf(buf + len,
170                                                          sizeof(buf) - len,
171                                                          " %d", i);
172                 }
173                 len += scnprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
174                                  "flags %#x", dma->map, dma->flags);
175                 break;
176         }
177         pnp_dbg(&dev->dev, "%s\n", buf);
178 }