summaryrefslogtreecommitdiff
path: root/drivers/pcmcia/pcmcia_cis.c
blob: ce8b94a3b675add5757b397f07deb2b9f60755fa (plain)
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
/*
 * PCMCIA high-level CIS access functions
 *
 * The initial developer of the original code is David A. Hinds
 * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * Copyright (C) 1999	     David A. Hinds
 * Copyright (C) 2004-2009   Dominik Brodowski
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>

#include <pcmcia/cisreg.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ss.h>
#include <pcmcia/ds.h>
#include "cs_internal.h"


/**
 * pccard_read_tuple() - internal CIS tuple access
 * @s:		the struct pcmcia_socket where the card is inserted
 * @function:	the device function we loop for
 * @code:	which CIS code shall we look for?
 * @parse:	buffer where the tuple shall be parsed (or NULL, if no parse)
 *
 * pccard_read_tuple() reads out one tuple and attempts to parse it
 */
int pccard_read_tuple(struct pcmcia_socket *s, unsigned int function,
		cisdata_t code, void *parse)
{
	tuple_t tuple;
	cisdata_t *buf;
	int ret;

	buf = kmalloc(256, GFP_KERNEL);
	if (buf == NULL) {
		dev_printk(KERN_WARNING, &s->dev, "no memory to read tuple\n");
		return -ENOMEM;
	}
	tuple.DesiredTuple = code;
	tuple.Attributes = 0;
	if (function == BIND_FN_ALL)
		tuple.Attributes = TUPLE_RETURN_COMMON;
	ret = pccard_get_first_tuple(s, function, &tuple);
	if (ret != 0)
		goto done;
	tuple.TupleData = buf;
	tuple.TupleOffset = 0;
	tuple.TupleDataMax = 255;
	ret = pccard_get_tuple_data(s, &tuple);
	if (ret != 0)
		goto done;
	ret = pcmcia_parse_tuple(&tuple, parse);
done:
	kfree(buf);
	return ret;
}


/**
 * pccard_loop_tuple() - loop over tuples in the CIS
 * @s:		the struct pcmcia_socket where the card is inserted
 * @function:	the device function we loop for
 * @code:	which CIS code shall we look for?
 * @parse:	buffer where the tuple shall be parsed (or NULL, if no parse)
 * @priv_data:	private data to be passed to the loop_tuple function.
 * @loop_tuple:	function to call for each CIS entry of type @function. IT
 *		gets passed the raw tuple, the paresed tuple (if @parse is
 *		set) and @priv_data.
 *
 * pccard_loop_tuple() loops over all CIS entries of type @function, and
 * calls the @loop_tuple function for each entry. If the call to @loop_tuple
 * returns 0, the loop exits. Returns 0 on success or errorcode otherwise.
 */
int pccard_loop_tuple(struct pcmcia_socket *s, unsigned int function,
		      cisdata_t code, cisparse_t *parse, void *priv_data,
		      int (*loop_tuple) (tuple_t *tuple,
					 cisparse_t *parse,
					 void *priv_data))
{
	tuple_t tuple;
	cisdata_t *buf;
	int ret;

	buf = kzalloc(256, GFP_KERNEL);
	if (buf == NULL) {
		dev_printk(KERN_WARNING, &s->dev, "no memory to read tuple\n");
		return -ENOMEM;
	}

	tuple.TupleData = buf;
	tuple.TupleDataMax = 255;
	tuple.TupleOffset = 0;
	tuple.DesiredTuple = code;
	tuple.Attributes = 0;

	ret = pccard_get_first_tuple(s, function, &tuple);
	while (!ret) {
		if (pccard_get_tuple_data(s, &tuple))
			goto next_entry;

		if (parse)
			if (pcmcia_parse_tuple(&tuple, parse))
				goto next_entry;

		ret = loop_tuple(&tuple, parse, priv_data);
		if (!ret)
			break;

next_entry:
		ret = pccard_get_next_tuple(s, function, &tuple);
	}

	kfree(buf);
	return ret;
}

struct pcmcia_cfg_mem {
	struct pcmcia_device *p_dev;
	void *priv_data;
	int (*conf_check) (struct pcmcia_device *p_dev,
			   cistpl_cftable_entry_t *cfg,
			   cistpl_cftable_entry_t *dflt,
			   unsigned int vcc,
			   void *priv_data);
	cisparse_t parse;
	cistpl_cftable_entry_t dflt;
};

/**
 * pcmcia_do_loop_config() - internal helper for pcmcia_loop_config()
 *
 * pcmcia_do_loop_config() is the internal callback for the call from
 * pcmcia_loop_config() to pccard_loop_tuple(). Data is transferred
 * by a struct pcmcia_cfg_mem.
 */
static int pcmcia_do_loop_config(tuple_t *tuple, cisparse_t *parse, void *priv)
{
	cistpl_cftable_entry_t *cfg = &parse->cftable_entry;
	struct pcmcia_cfg_mem *cfg_mem = priv;

	/* default values */
	cfg_mem->p_dev->config_index = cfg->index;
	if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
		cfg_mem->dflt = *cfg;

	return cfg_mem->conf_check(cfg_mem->p_dev, cfg, &cfg_mem->dflt,
				   cfg_mem->p_dev->socket->socket.Vcc,
				   cfg_mem->priv_data);
}

/**
 * pcmcia_loop_config() - loop over configuration options
 * @p_dev:	the struct pcmcia_device which we need to loop for.
 * @conf_check:	function to call for each configuration option.
 *		It gets passed the struct pcmcia_device, the CIS data
 *		describing the configuration option, and private data
 *		being passed to pcmcia_loop_config()
 * @priv_data:	private data to be passed to the conf_check function.
 *
 * pcmcia_loop_config() loops over all configuration options, and calls
 * the driver-specific conf_check() for each one, checking whether
 * it is a valid one. Returns 0 on success or errorcode otherwise.
 */
int pcmcia_loop_config(struct pcmcia_device *p_dev,
		       int	(*conf_check)	(struct pcmcia_device *p_dev,
						 cistpl_cftable_entry_t *cfg,
						 cistpl_cftable_entry_t *dflt,
						 unsigned int vcc,
						 void *priv_data),
		       void *priv_data)
{
	struct pcmcia_cfg_mem *cfg_mem;
	int ret;

	cfg_mem = kzalloc(sizeof(struct pcmcia_cfg_mem), GFP_KERNEL);
	if (cfg_mem == NULL)
		return -ENOMEM;

	cfg_mem->p_dev = p_dev;
	cfg_mem->conf_check = conf_check;
	cfg_mem->priv_data = priv_data;

	ret = pccard_loop_tuple(p_dev->socket, p_dev->func,
				CISTPL_CFTABLE_ENTRY, &cfg_mem->parse,
				cfg_mem, pcmcia_do_loop_config);

	kfree(cfg_mem);
	return ret;
}
EXPORT_SYMBOL(pcmcia_loop_config);


struct pcmcia_loop_mem {
	struct pcmcia_device *p_dev;
	void *priv_data;
	int (*loop_tuple) (struct pcmcia_device *p_dev,
			   tuple_t *tuple,
			   void *priv_data);
};

/**
 * pcmcia_do_loop_tuple() - internal helper for pcmcia_loop_config()
 *
 * pcmcia_do_loop_tuple() is the internal callback for the call from
 * pcmcia_loop_tuple() to pccard_loop_tuple(). Data is transferred
 * by a struct pcmcia_cfg_mem.
 */
static int pcmcia_do_loop_tuple(tuple_t *tuple, cisparse_t *parse, void *priv)
{
	struct pcmcia_loop_mem *loop = priv;

	return loop->loop_tuple(loop->p_dev, tuple, loop->priv_data);
};

/**
 * pcmcia_loop_tuple() - loop over tuples in the CIS
 * @p_dev:	the struct pcmcia_device which we need to loop for.
 * @code:	which CIS code shall we look for?
 * @priv_data:	private data to be passed to the loop_tuple function.
 * @loop_tuple:	function to call for each CIS entry of type @function. IT
 *		gets passed the raw tuple and @priv_data.
 *
 * pcmcia_loop_tuple() loops over all CIS entries of type @function, and
 * calls the @loop_tuple function for each entry. If the call to @loop_tuple
 * returns 0, the loop exits. Returns 0 on success or errorcode otherwise.
 */
int pcmcia_loop_tuple(struct pcmcia_device *p_dev, cisdata_t code,
		      int (*loop_tuple) (struct pcmcia_device *p_dev,
					 tuple_t *tuple,
					 void *priv_data),
		      void *priv_data)
{
	struct pcmcia_loop_mem loop = {
		.p_dev = p_dev,
		.loop_tuple = loop_tuple,
		.priv_data = priv_data};

	return pccard_loop_tuple(p_dev->socket, p_dev->func, code, NULL,
				 &loop, pcmcia_do_loop_tuple);
}
EXPORT_SYMBOL(pcmcia_loop_tuple);


struct pcmcia_loop_get {
	size_t len;
	cisdata_t **buf;
};

/**
 * pcmcia_do_get_tuple() - internal helper for pcmcia_get_tuple()
 *
 * pcmcia_do_get_tuple() is the internal callback for the call from
 * pcmcia_get_tuple() to pcmcia_loop_tuple(). As we're only interested in
 * the first tuple, return 0 unconditionally. Create a memory buffer large
 * enough to hold the content of the tuple, and fill it with the tuple data.
 * The caller is responsible to free the buffer.
 */
static int pcmcia_do_get_tuple(struct pcmcia_device *p_dev, tuple_t *tuple,
			       void *priv)
{
	struct pcmcia_loop_get *get = priv;

	*get->buf = kzalloc(tuple->TupleDataLen, GFP_KERNEL);
	if (*get->buf) {
		get->len = tuple->TupleDataLen;
		memcpy(*get->buf, tuple->TupleData, tuple->TupleDataLen);
	} else
		dev_dbg(&p_dev->dev, "do_get_tuple: out of memory\n");
	return 0;
}

/**
 * pcmcia_get_tuple() - get first tuple from CIS
 * @p_dev:	the struct pcmcia_device which we need to loop for.
 * @code:	which CIS code shall we look for?
 * @buf:        pointer to store the buffer to.
 *
 * pcmcia_get_tuple() gets the content of the first CIS entry of type @code.
 * It returns the buffer length (or zero). The caller is responsible to free
 * the buffer passed in @buf.
 */
size_t pcmcia_get_tuple(struct pcmcia_device *p_dev, cisdata_t code,
			unsigned char **buf)
{
	struct pcmcia_loop_get get = {
		.len = 0,
		.buf = buf,
	};

	*get.buf = NULL;
	pcmcia_loop_tuple(p_dev, code, pcmcia_do_get_tuple, &get);

	return get.len;
}
EXPORT_SYMBOL(pcmcia_get_tuple);


/**
 * pcmcia_do_get_mac() - internal helper for pcmcia_get_mac_from_cis()
 *
 * pcmcia_do_get_mac() is the internal callback for the call from
 * pcmcia_get_mac_from_cis() to pcmcia_loop_tuple(). We check whether the
 * tuple contains a proper LAN_NODE_ID of length 6, and copy the data
 * to struct net_device->dev_addr[i].
 */
static int pcmcia_do_get_mac(struct pcmcia_device *p_dev, tuple_t *tuple,
			     void *priv)
{
	struct net_device *dev = priv;
	int i;

	if (tuple->TupleData[0] != CISTPL_FUNCE_LAN_NODE_ID)
		return -EINVAL;
	if (tuple->TupleDataLen < ETH_ALEN + 2) {
		dev_warn(&p_dev->dev, "Invalid CIS tuple length for "
			"LAN_NODE_ID\n");
		return -EINVAL;
	}

	if (tuple->TupleData[1] != ETH_ALEN) {
		dev_warn(&p_dev->dev, "Invalid header for LAN_NODE_ID\n");
		return -EINVAL;
	}
	for (i = 0; i < 6; i++)
		dev->dev_addr[i] = tuple->TupleData[i+2];
	return 0;
}

/**
 * pcmcia_get_mac_from_cis() - read out MAC address from CISTPL_FUNCE
 * @p_dev:	the struct pcmcia_device for which we want the address.
 * @dev:	a properly prepared struct net_device to store the info to.
 *
 * pcmcia_get_mac_from_cis() reads out the hardware MAC address from
 * CISTPL_FUNCE and stores it into struct net_device *dev->dev_addr which
 * must be set up properly by the driver (see examples!).
 */
int pcmcia_get_mac_from_cis(struct pcmcia_device *p_dev, struct net_device *dev)
{
	return pcmcia_loop_tuple(p_dev, CISTPL_FUNCE, pcmcia_do_get_mac, dev);
}
EXPORT_SYMBOL(pcmcia_get_mac_from_cis);