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>

1 files changed, 62 insertions, 0 deletions

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index 4884a18cf9e6..9f054bc847f2 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -909,3 +909,65 @@ void pcmcia_disable_device(struct pcmcia_device *p_dev) {
                 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);