drivers/pcmcia/pcmcia_cis.c

   1 /*
   2  * PCMCIA high-level CIS access functions
   3  *
   4  * The initial developer of the original code is David A. Hinds
   5  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   6  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   7  *
   8  * Copyright (C) 1999        David A. Hinds
   9  * Copyright (C) 2004-2009   Dominik Brodowski
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  */
  16
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/netdevice.h>
  21
  22 #include <pcmcia/cisreg.h>
  23 #include <pcmcia/cistpl.h>
  24 #include <pcmcia/ss.h>
  25 #include <pcmcia/cs.h>
  26 #include <pcmcia/ds.h>
  27 #include "cs_internal.h"
  28
  29
  30 /**
  31  * pccard_read_tuple() - internal CIS tuple access
  32  * @s:          the struct pcmcia_socket where the card is inserted
  33  * @function:   the device function we loop for
  34  * @code:       which CIS code shall we look for?
  35  * @parse:      buffer where the tuple shall be parsed (or NULL, if no parse)
  36  *
  37  * pccard_read_tuple() reads out one tuple and attempts to parse it
  38  */
  39 int pccard_read_tuple(struct pcmcia_socket *s, unsigned int function,
  40                 cisdata_t code, void *parse)
  41 {
  42         tuple_t tuple;
  43         cisdata_t *buf;
  44         int ret;
  45
  46         buf = kmalloc(256, GFP_KERNEL);
  47         if (buf == NULL) {
  48                 dev_printk(KERN_WARNING, &s->dev, "no memory to read tuple\n");
  49                 return -ENOMEM;
  50         }
  51         tuple.DesiredTuple = code;
  52         tuple.Attributes = 0;
  53         if (function == BIND_FN_ALL)
  54                 tuple.Attributes = TUPLE_RETURN_COMMON;
  55         ret = pccard_get_first_tuple(s, function, &tuple);
  56         if (ret != 0)
  57                 goto done;
  58         tuple.TupleData = buf;
  59         tuple.TupleOffset = 0;
  60         tuple.TupleDataMax = 255;
  61         ret = pccard_get_tuple_data(s, &tuple);
  62         if (ret != 0)
  63                 goto done;
  64         ret = pcmcia_parse_tuple(&tuple, parse);
  65 done:
  66         kfree(buf);
  67         return ret;
  68 }
  69
  70
  71 /**
  72  * pccard_loop_tuple() - loop over tuples in the CIS
  73  * @s:          the struct pcmcia_socket where the card is inserted
  74  * @function:   the device function we loop for
  75  * @code:       which CIS code shall we look for?
  76  * @parse:      buffer where the tuple shall be parsed (or NULL, if no parse)
  77  * @priv_data:  private data to be passed to the loop_tuple function.
  78  * @loop_tuple: function to call for each CIS entry of type @function. IT
  79  *              gets passed the raw tuple, the paresed tuple (if @parse is
  80  *              set) and @priv_data.
  81  *
  82  * pccard_loop_tuple() loops over all CIS entries of type @function, and
  83  * calls the @loop_tuple function for each entry. If the call to @loop_tuple
  84  * returns 0, the loop exits. Returns 0 on success or errorcode otherwise.
  85  */
  86 int pccard_loop_tuple(struct pcmcia_socket *s, unsigned int function,
  87                       cisdata_t code, cisparse_t *parse, void *priv_data,
  88                       int (*loop_tuple) (tuple_t *tuple,
  89                                          cisparse_t *parse,
  90                                          void *priv_data))
  91 {
  92         tuple_t tuple;
  93         cisdata_t *buf;
  94         int ret;
  95
  96         buf = kzalloc(256, GFP_KERNEL);
  97         if (buf == NULL) {
  98                 dev_printk(KERN_WARNING, &s->dev, "no memory to read tuple\n");
  99                 return -ENOMEM;
 100         }
 101
 102         tuple.TupleData = buf;
 103         tuple.TupleDataMax = 255;
 104         tuple.TupleOffset = 0;
 105         tuple.DesiredTuple = code;
 106         tuple.Attributes = 0;
 107
 108         ret = pccard_get_first_tuple(s, function, &tuple);
 109         while (!ret) {
 110                 if (pccard_get_tuple_data(s, &tuple))
 111                         goto next_entry;
 112
 113                 if (parse)
 114                         if (pcmcia_parse_tuple(&tuple, parse))
 115                                 goto next_entry;
 116
 117                 ret = loop_tuple(&tuple, parse, priv_data);
 118                 if (!ret)
 119                         break;
 120
 121 next_entry:
 122                 ret = pccard_get_next_tuple(s, function, &tuple);
 123         }
 124
 125         kfree(buf);
 126         return ret;
 127 }
 128
 129 struct pcmcia_cfg_mem {
 130         struct pcmcia_device *p_dev;
 131         void *priv_data;
 132         int (*conf_check) (struct pcmcia_device *p_dev,
 133                            cistpl_cftable_entry_t *cfg,
 134                            cistpl_cftable_entry_t *dflt,
 135                            unsigned int vcc,
 136                            void *priv_data);
 137         cisparse_t parse;
 138         cistpl_cftable_entry_t dflt;
 139 };
 140
 141 /**
 142  * pcmcia_do_loop_config() - internal helper for pcmcia_loop_config()
 143  *
 144  * pcmcia_do_loop_config() is the internal callback for the call from
 145  * pcmcia_loop_config() to pccard_loop_tuple(). Data is transferred
 146  * by a struct pcmcia_cfg_mem.
 147  */
 148 static int pcmcia_do_loop_config(tuple_t *tuple, cisparse_t *parse, void *priv)
 149 {
 150         cistpl_cftable_entry_t *cfg = &parse->cftable_entry;
 151         struct pcmcia_cfg_mem *cfg_mem = priv;
 152
 153         /* default values */
 154         cfg_mem->p_dev->conf.ConfigIndex = cfg->index;
 155         if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
 156                 cfg_mem->dflt = *cfg;
 157
 158         return cfg_mem->conf_check(cfg_mem->p_dev, cfg, &cfg_mem->dflt,
 159                                    cfg_mem->p_dev->socket->socket.Vcc,
 160                                    cfg_mem->priv_data);
 161 }
 162
 163 /**
 164  * pcmcia_loop_config() - loop over configuration options
 165  * @p_dev:      the struct pcmcia_device which we need to loop for.
 166  * @conf_check: function to call for each configuration option.
 167  *              It gets passed the struct pcmcia_device, the CIS data
 168  *              describing the configuration option, and private data
 169  *              being passed to pcmcia_loop_config()
 170  * @priv_data:  private data to be passed to the conf_check function.
 171  *
 172  * pcmcia_loop_config() loops over all configuration options, and calls
 173  * the driver-specific conf_check() for each one, checking whether
 174  * it is a valid one. Returns 0 on success or errorcode otherwise.
 175  */
 176 int pcmcia_loop_config(struct pcmcia_device *p_dev,
 177                        int      (*conf_check)   (struct pcmcia_device *p_dev,
 178                                                  cistpl_cftable_entry_t *cfg,
 179                                                  cistpl_cftable_entry_t *dflt,
 180                                                  unsigned int vcc,
 181                                                  void *priv_data),
 182                        void *priv_data)
 183 {
 184         struct pcmcia_cfg_mem *cfg_mem;
 185         int ret;
 186
 187         cfg_mem = kzalloc(sizeof(struct pcmcia_cfg_mem), GFP_KERNEL);
 188         if (cfg_mem == NULL)
 189                 return -ENOMEM;
 190
 191         cfg_mem->p_dev = p_dev;
 192         cfg_mem->conf_check = conf_check;
 193         cfg_mem->priv_data = priv_data;
 194
 195         ret = pccard_loop_tuple(p_dev->socket, p_dev->func,
 196                                 CISTPL_CFTABLE_ENTRY, &cfg_mem->parse,
 197                                 cfg_mem, pcmcia_do_loop_config);
 198
 199         kfree(cfg_mem);
 200         return ret;
 201 }
 202 EXPORT_SYMBOL(pcmcia_loop_config);
 203
 204
 205 struct pcmcia_loop_mem {
 206         struct pcmcia_device *p_dev;
 207         void *priv_data;
 208         int (*loop_tuple) (struct pcmcia_device *p_dev,
 209                            tuple_t *tuple,
 210                            void *priv_data);
 211 };
 212
 213 /**
 214  * pcmcia_do_loop_tuple() - internal helper for pcmcia_loop_config()
 215  *
 216  * pcmcia_do_loop_tuple() is the internal callback for the call from
 217  * pcmcia_loop_tuple() to pccard_loop_tuple(). Data is transferred
 218  * by a struct pcmcia_cfg_mem.
 219  */
 220 static int pcmcia_do_loop_tuple(tuple_t *tuple, cisparse_t *parse, void *priv)
 221 {
 222         struct pcmcia_loop_mem *loop = priv;
 223
 224         return loop->loop_tuple(loop->p_dev, tuple, loop->priv_data);
 225 };
 226
 227 /**
 228  * pcmcia_loop_tuple() - loop over tuples in the CIS
 229  * @p_dev:      the struct pcmcia_device which we need to loop for.
 230  * @code:       which CIS code shall we look for?
 231  * @priv_data:  private data to be passed to the loop_tuple function.
 232  * @loop_tuple: function to call for each CIS entry of type @function. IT
 233  *              gets passed the raw tuple and @priv_data.
 234  *
 235  * pcmcia_loop_tuple() loops over all CIS entries of type @function, and
 236  * calls the @loop_tuple function for each entry. If the call to @loop_tuple
 237  * returns 0, the loop exits. Returns 0 on success or errorcode otherwise.
 238  */
 239 int pcmcia_loop_tuple(struct pcmcia_device *p_dev, cisdata_t code,
 240                       int (*loop_tuple) (struct pcmcia_device *p_dev,
 241                                          tuple_t *tuple,
 242                                          void *priv_data),
 243                       void *priv_data)
 244 {
 245         struct pcmcia_loop_mem loop = {
 246                 .p_dev = p_dev,
 247                 .loop_tuple = loop_tuple,
 248                 .priv_data = priv_data};
 249
 250         return pccard_loop_tuple(p_dev->socket, p_dev->func, code, NULL,
 251                                  &loop, pcmcia_do_loop_tuple);
 252 }
 253 EXPORT_SYMBOL(pcmcia_loop_tuple);
 254
 255
 256 struct pcmcia_loop_get {
 257         size_t len;
 258         cisdata_t **buf;
 259 };
 260
 261 /**
 262  * pcmcia_do_get_tuple() - internal helper for pcmcia_get_tuple()
 263  *
 264  * pcmcia_do_get_tuple() is the internal callback for the call from
 265  * pcmcia_get_tuple() to pcmcia_loop_tuple(). As we're only interested in
 266  * the first tuple, return 0 unconditionally. Create a memory buffer large
 267  * enough to hold the content of the tuple, and fill it with the tuple data.
 268  * The caller is responsible to free the buffer.
 269  */
 270 static int pcmcia_do_get_tuple(struct pcmcia_device *p_dev, tuple_t *tuple,
 271                                void *priv)
 272 {
 273         struct pcmcia_loop_get *get = priv;
 274
 275         *get->buf = kzalloc(tuple->TupleDataLen, GFP_KERNEL);
 276         if (*get->buf) {
 277                 get->len = tuple->TupleDataLen;
 278                 memcpy(*get->buf, tuple->TupleData, tuple->TupleDataLen);
 279         } else
 280                 dev_dbg(&p_dev->dev, "do_get_tuple: out of memory\n");
 281         return 0;
 282 }
 283
 284 /**
 285  * pcmcia_get_tuple() - get first tuple from CIS
 286  * @p_dev:      the struct pcmcia_device which we need to loop for.
 287  * @code:       which CIS code shall we look for?
 288  * @buf:        pointer to store the buffer to.
 289  *
 290  * pcmcia_get_tuple() gets the content of the first CIS entry of type @code.
 291  * It returns the buffer length (or zero). The caller is responsible to free
 292  * the buffer passed in @buf.
 293  */
 294 size_t pcmcia_get_tuple(struct pcmcia_device *p_dev, cisdata_t code,
 295                         unsigned char **buf)
 296 {
 297         struct pcmcia_loop_get get = {
 298                 .len = 0,
 299                 .buf = buf,
 300         };
 301
 302         *get.buf = NULL;
 303         pcmcia_loop_tuple(p_dev, code, pcmcia_do_get_tuple, &get);
 304
 305         return get.len;
 306 }
 307 EXPORT_SYMBOL(pcmcia_get_tuple);
 308
 309
 310 /**
 311  * pcmcia_do_get_mac() - internal helper for pcmcia_get_mac_from_cis()
 312  *
 313  * pcmcia_do_get_mac() is the internal callback for the call from
 314  * pcmcia_get_mac_from_cis() to pcmcia_loop_tuple(). We check whether the
 315  * tuple contains a proper LAN_NODE_ID of length 6, and copy the data
 316  * to struct net_device->dev_addr[i].
 317  */
 318 static int pcmcia_do_get_mac(struct pcmcia_device *p_dev, tuple_t *tuple,
 319                              void *priv)
 320 {
 321         struct net_device *dev = priv;
 322         int i;
 323
 324         if (tuple->TupleData[0] != CISTPL_FUNCE_LAN_NODE_ID)
 325                 return -EINVAL;
 326         if (tuple->TupleDataLen < ETH_ALEN + 2) {
 327                 dev_warn(&p_dev->dev, "Invalid CIS tuple length for "
 328                         "LAN_NODE_ID\n");
 329                 return -EINVAL;
 330         }
 331
 332         if (tuple->TupleData[1] != ETH_ALEN) {
 333                 dev_warn(&p_dev->dev, "Invalid header for LAN_NODE_ID\n");
 334                 return -EINVAL;
 335         }
 336         for (i = 0; i < 6; i++)
 337                 dev->dev_addr[i] = tuple->TupleData[i+2];
 338         return 0;
 339 }
 340
 341 /**
 342  * pcmcia_get_mac_from_cis() - read out MAC address from CISTPL_FUNCE
 343  * @p_dev:      the struct pcmcia_device for which we want the address.
 344  * @dev:        a properly prepared struct net_device to store the info to.
 345  *
 346  * pcmcia_get_mac_from_cis() reads out the hardware MAC address from
 347  * CISTPL_FUNCE and stores it into struct net_device *dev->dev_addr which
 348  * must be set up properly by the driver (see examples!).
 349  */
 350 int pcmcia_get_mac_from_cis(struct pcmcia_device *p_dev, struct net_device *dev)
 351 {
 352         return pcmcia_loop_tuple(p_dev, CISTPL_FUNCE, pcmcia_do_get_mac, dev);
 353 }
 354 EXPORT_SYMBOL(pcmcia_get_mac_from_cis);
 355