aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pnp/support.c
blob: bbf78ef4ba024932af837e18f16503daf8c9ce4a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
/*
 * support.c - standard functions for the use of pnp protocol drivers
 *
 * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
 * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 */

#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/pnp.h>
#include "base.h"

/**
 * pnp_is_active - Determines if a device is active based on its current
 *	resources
 * @dev: pointer to the desired PnP device
 */
int pnp_is_active(struct pnp_dev *dev)
{
	/*
	 * I don't think this is very reliable because pnp_disable_dev()
	 * only clears out auto-assigned resources.
	 */
	if (!pnp_port_start(dev, 0) && pnp_port_len(dev, 0) <= 1 &&
	    !pnp_mem_start(dev, 0) && pnp_mem_len(dev, 0) <= 1 &&
	    pnp_irq(dev, 0) == -1 && pnp_dma(dev, 0) == -1)
		return 0;
	else
		return 1;
}

EXPORT_SYMBOL(pnp_is_active);

/*
 * Functionally similar to acpi_ex_eisa_id_to_string(), but that's
 * buried in the ACPI CA, and we can't depend on it being present.
 */
void pnp_eisa_id_to_string(u32 id, char *str)
{
	id = be32_to_cpu(id);

	/*
	 * According to the specs, the first three characters are five-bit
	 * compressed ASCII, and the left-over high order bit should be zero.
	 * However, the Linux ISAPNP code historically used six bits for the
	 * first character, and there seem to be IDs that depend on that,
	 * e.g., "nEC8241" in the Linux 8250_pnp serial driver and the
	 * FreeBSD sys/pc98/cbus/sio_cbus.c driver.
	 */
	str[0] = 'A' + ((id >> 26) & 0x3f) - 1;
	str[1] = 'A' + ((id >> 21) & 0x1f) - 1;
	str[2] = 'A' + ((id >> 16) & 0x1f) - 1;
	str[3] = hex_asc_hi(id >> 8);
	str[4] = hex_asc_lo(id >> 8);
	str[5] = hex_asc_hi(id);
	str[6] = hex_asc_lo(id);
	str[7] = '\0';
}

char *pnp_resource_type_name(struct resource *res)
{
	switch (pnp_resource_type(res)) {
	case IORESOURCE_IO:
		return "io";
	case IORESOURCE_MEM:
		return "mem";
	case IORESOURCE_IRQ:
		return "irq";
	case IORESOURCE_DMA:
		return "dma";
	}
	return NULL;
}

void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
{
#ifdef DEBUG
	char buf[128];
	int len = 0;
	struct pnp_resource *pnp_res;
	struct resource *res;

	if (list_empty(&dev->resources)) {
		dev_dbg(&dev->dev, "%s: no current resources\n", desc);
		return;
	}

	dev_dbg(&dev->dev, "%s: current resources:\n", desc);
	list_for_each_entry(pnp_res, &dev->resources, list) {
		res = &pnp_res->res;

		len += snprintf(buf + len, sizeof(buf) - len, "  %-3s ",
				pnp_resource_type_name(res));

		if (res->flags & IORESOURCE_DISABLED) {
			dev_dbg(&dev->dev, "%sdisabled\n", buf);
			continue;
		}

		switch (pnp_resource_type(res)) {
		case IORESOURCE_IO:
		case IORESOURCE_MEM:
			len += snprintf(buf + len, sizeof(buf) - len,
					"%#llx-%#llx flags %#lx",
					(unsigned long long) res->start,
					(unsigned long long) res->end,
					res->flags);
			break;
		case IORESOURCE_IRQ:
		case IORESOURCE_DMA:
			len += snprintf(buf + len, sizeof(buf) - len,
					"%lld flags %#lx",
					(unsigned long long) res->start,
					res->flags);
			break;
		}
		dev_dbg(&dev->dev, "%s\n", buf);
	}
#endif
}

char *pnp_option_priority_name(struct pnp_option *option)
{
	switch (pnp_option_priority(option)) {
	case PNP_RES_PRIORITY_PREFERRED:
		return "preferred";
	case PNP_RES_PRIORITY_ACCEPTABLE:
		return "acceptable";
	case PNP_RES_PRIORITY_FUNCTIONAL:
		return "functional";
	}
	return "invalid";
}

void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
{
#ifdef DEBUG
	char buf[128];
	int len = 0, i;
	struct pnp_port *port;
	struct pnp_mem *mem;
	struct pnp_irq *irq;
	struct pnp_dma *dma;

	if (pnp_option_is_dependent(option))
		len += snprintf(buf + len, sizeof(buf) - len,
				"  dependent set %d (%s) ",
				pnp_option_set(option),
				pnp_option_priority_name(option));
	else
		len += snprintf(buf + len, sizeof(buf) - len, "  independent ");

	switch (option->type) {
	case IORESOURCE_IO:
		port = &option->u.port;
		len += snprintf(buf + len, sizeof(buf) - len, "io  min %#llx "
				"max %#llx align %lld size %lld flags %#x",
				(unsigned long long) port->min,
				(unsigned long long) port->max,
				(unsigned long long) port->align,
				(unsigned long long) port->size, port->flags);
		break;
	case IORESOURCE_MEM:
		mem = &option->u.mem;
		len += snprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
				"max %#llx align %lld size %lld flags %#x",
				(unsigned long long) mem->min,
				(unsigned long long) mem->max,
				(unsigned long long) mem->align,
				(unsigned long long) mem->size, mem->flags);
		break;
	case IORESOURCE_IRQ:
		irq = &option->u.irq;
		len += snprintf(buf + len, sizeof(buf) - len, "irq");
		if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
			len += snprintf(buf + len, sizeof(buf) - len,
					" <none>");
		else {
			for (i = 0; i < PNP_IRQ_NR; i++)
				if (test_bit(i, irq->map.bits))
					len += snprintf(buf + len,
							sizeof(buf) - len,
							" %d", i);
		}
		len += snprintf(buf + len, sizeof(buf) - len, " flags %#x",
				irq->flags);
		if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
			len += snprintf(buf + len, sizeof(buf) - len,
					" (optional)");
		break;
	case IORESOURCE_DMA:
		dma = &option->u.dma;
		len += snprintf(buf + len, sizeof(buf) - len, "dma");
		if (!dma->map)
			len += snprintf(buf + len, sizeof(buf) - len,
					" <none>");
		else {
			for (i = 0; i < 8; i++)
				if (dma->map & (1 << i))
					len += snprintf(buf + len,
							sizeof(buf) - len,
							" %d", i);
		}
		len += snprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
				"flags %#x", dma->map, dma->flags);
		break;
	}
	dev_dbg(&dev->dev, "%s\n", buf);
#endif
}