pcmcia: add pcmcia_loop_config() helper
By calling pcmcia_loop_config(), a pcmcia driver can iterate over all
available configuration options. During a driver's probe() phase, one
doesn't need to use pcmcia_get_{first,next}_tuple, pcmcia_get_tuple_data
and pcmcia_parse_tuple directly in most if not all cases.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 4884a18..9f054bc 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -909,3 +909,65 @@
pcmcia_release_window(p_dev->win);
}
EXPORT_SYMBOL(pcmcia_disable_device);
+
+
+struct pcmcia_cfg_mem {
+ tuple_t tuple;
+ cisparse_t parse;
+ u8 buf[256];
+};
+
+/**
+ * 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.
+ */
+int pcmcia_loop_config(struct pcmcia_device *p_dev,
+ int (*conf_check) (struct pcmcia_device *p_dev,
+ cistpl_cftable_entry_t *cfg,
+ void *priv_data),
+ void *priv_data)
+{
+ struct pcmcia_cfg_mem *cfg_mem;
+ tuple_t *tuple;
+ int ret = -ENODEV;
+
+ cfg_mem = kzalloc(sizeof(struct pcmcia_cfg_mem), GFP_KERNEL);
+ if (cfg_mem == NULL)
+ return -ENOMEM;
+
+ tuple = &cfg_mem->tuple;
+ tuple->TupleData = cfg_mem->buf;
+ tuple->TupleDataMax = 255;
+ tuple->TupleOffset = 0;
+ tuple->DesiredTuple = CISTPL_CFTABLE_ENTRY;
+ tuple->Attributes = 0;
+
+ ret = pcmcia_get_first_tuple(p_dev, tuple);
+ while (!ret) {
+ if (pcmcia_get_tuple_data(p_dev, tuple))
+ goto next_entry;
+
+ if (pcmcia_parse_tuple(p_dev, tuple, &cfg_mem->parse))
+ goto next_entry;
+
+ ret = conf_check(p_dev, &cfg_mem->parse.cftable_entry,
+ priv_data);
+ if (!ret)
+ break;
+
+next_entry:
+ ret = pcmcia_get_next_tuple(p_dev, tuple);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(pcmcia_loop_config);