2 * support.c - standard functions for the use of pnp protocol drivers
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>
9 #include <linux/module.h>
10 #include <linux/ctype.h>
11 #include <linux/pnp.h>
15 * pnp_is_active - Determines if a device is active based on its current
17 * @dev: pointer to the desired PnP device
19 int pnp_is_active(struct pnp_dev
*dev
)
22 * I don't think this is very reliable because pnp_disable_dev()
23 * only clears out auto-assigned resources.
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)
33 EXPORT_SYMBOL(pnp_is_active
);
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.
39 void pnp_eisa_id_to_string(u32 id
, char *str
)
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.
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
);
61 char *pnp_resource_type_name(struct resource
*res
)
63 switch (pnp_resource_type(res
)) {
78 void dbg_pnp_show_resources(struct pnp_dev
*dev
, char *desc
)
80 struct pnp_resource
*pnp_res
;
82 if (list_empty(&dev
->resources
))
83 pnp_dbg(&dev
->dev
, "%s: no current resources\n", desc
);
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
);
91 char *pnp_option_priority_name(struct pnp_option
*option
)
93 switch (pnp_option_priority(option
)) {
94 case PNP_RES_PRIORITY_PREFERRED
:
96 case PNP_RES_PRIORITY_ACCEPTABLE
:
98 case PNP_RES_PRIORITY_FUNCTIONAL
:
104 void dbg_pnp_show_option(struct pnp_dev
*dev
, struct pnp_option
*option
)
108 struct pnp_port
*port
;
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
));
119 len
+= scnprintf(buf
+ len
, sizeof(buf
) - len
,
122 switch (option
->type
) {
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
);
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
);
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
,
148 for (i
= 0; i
< PNP_IRQ_NR
; i
++)
149 if (test_bit(i
, irq
->map
.bits
))
150 len
+= scnprintf(buf
+ len
,
154 len
+= scnprintf(buf
+ len
, sizeof(buf
) - len
, " flags %#x",
156 if (irq
->flags
& IORESOURCE_IRQ_OPTIONAL
)
157 len
+= scnprintf(buf
+ len
, sizeof(buf
) - len
,
161 dma
= &option
->u
.dma
;
162 len
+= scnprintf(buf
+ len
, sizeof(buf
) - len
, "dma");
164 len
+= scnprintf(buf
+ len
, sizeof(buf
) - len
,
167 for (i
= 0; i
< 8; i
++)
168 if (dma
->map
& (1 << i
))
169 len
+= scnprintf(buf
+ len
,
173 len
+= scnprintf(buf
+ len
, sizeof(buf
) - len
, " (bitmask %#x) "
174 "flags %#x", dma
->map
, dma
->flags
);
177 pnp_dbg(&dev
->dev
, "%s\n", buf
);