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path: root/drivers/net/wireless/marvell/libertas/firmware.c
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Diffstat (limited to 'drivers/net/wireless/marvell/libertas/firmware.c')
-rw-r--r--drivers/net/wireless/marvell/libertas/firmware.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/drivers/net/wireless/marvell/libertas/firmware.c b/drivers/net/wireless/marvell/libertas/firmware.c
new file mode 100644
index 000000000000..51b92b5df119
--- /dev/null
+++ b/drivers/net/wireless/marvell/libertas/firmware.c
@@ -0,0 +1,227 @@
+/*
+ * Firmware loading and handling functions.
+ */
+
+#include <linux/sched.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+
+#include "dev.h"
+#include "decl.h"
+
+static void load_next_firmware_from_table(struct lbs_private *private);
+
+static void lbs_fw_loaded(struct lbs_private *priv, int ret,
+ const struct firmware *helper, const struct firmware *mainfw)
+{
+ unsigned long flags;
+
+ lbs_deb_fw("firmware load complete, code %d\n", ret);
+
+ /* User must free helper/mainfw */
+ priv->fw_callback(priv, ret, helper, mainfw);
+
+ spin_lock_irqsave(&priv->driver_lock, flags);
+ priv->fw_callback = NULL;
+ wake_up(&priv->fw_waitq);
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+}
+
+static void do_load_firmware(struct lbs_private *priv, const char *name,
+ void (*cb)(const struct firmware *fw, void *context))
+{
+ int ret;
+
+ lbs_deb_fw("Requesting %s\n", name);
+ ret = request_firmware_nowait(THIS_MODULE, true, name,
+ priv->fw_device, GFP_KERNEL, priv, cb);
+ if (ret) {
+ lbs_deb_fw("request_firmware_nowait error %d\n", ret);
+ lbs_fw_loaded(priv, ret, NULL, NULL);
+ }
+}
+
+static void main_firmware_cb(const struct firmware *firmware, void *context)
+{
+ struct lbs_private *priv = context;
+
+ if (!firmware) {
+ /* Failed to find firmware: try next table entry */
+ load_next_firmware_from_table(priv);
+ return;
+ }
+
+ /* Firmware found! */
+ lbs_fw_loaded(priv, 0, priv->helper_fw, firmware);
+ if (priv->helper_fw) {
+ release_firmware (priv->helper_fw);
+ priv->helper_fw = NULL;
+ }
+ release_firmware (firmware);
+}
+
+static void helper_firmware_cb(const struct firmware *firmware, void *context)
+{
+ struct lbs_private *priv = context;
+
+ if (!firmware) {
+ /* Failed to find firmware: try next table entry */
+ load_next_firmware_from_table(priv);
+ return;
+ }
+
+ /* Firmware found! */
+ if (priv->fw_iter->fwname) {
+ priv->helper_fw = firmware;
+ do_load_firmware(priv, priv->fw_iter->fwname, main_firmware_cb);
+ } else {
+ /* No main firmware needed for this helper --> success! */
+ lbs_fw_loaded(priv, 0, firmware, NULL);
+ }
+}
+
+static void load_next_firmware_from_table(struct lbs_private *priv)
+{
+ const struct lbs_fw_table *iter;
+
+ if (!priv->fw_iter)
+ iter = priv->fw_table;
+ else
+ iter = ++priv->fw_iter;
+
+ if (priv->helper_fw) {
+ release_firmware(priv->helper_fw);
+ priv->helper_fw = NULL;
+ }
+
+next:
+ if (!iter->helper) {
+ /* End of table hit. */
+ lbs_fw_loaded(priv, -ENOENT, NULL, NULL);
+ return;
+ }
+
+ if (iter->model != priv->fw_model) {
+ iter++;
+ goto next;
+ }
+
+ priv->fw_iter = iter;
+ do_load_firmware(priv, iter->helper, helper_firmware_cb);
+}
+
+void lbs_wait_for_firmware_load(struct lbs_private *priv)
+{
+ wait_event(priv->fw_waitq, priv->fw_callback == NULL);
+}
+
+/**
+ * lbs_get_firmware_async - Retrieves firmware asynchronously. Can load
+ * either a helper firmware and a main firmware (2-stage), or just the helper.
+ *
+ * @priv: Pointer to lbs_private instance
+ * @dev: A pointer to &device structure
+ * @card_model: Bus-specific card model ID used to filter firmware table
+ * elements
+ * @fw_table: Table of firmware file names and device model numbers
+ * terminated by an entry with a NULL helper name
+ * @callback: User callback to invoke when firmware load succeeds or fails.
+ */
+int lbs_get_firmware_async(struct lbs_private *priv, struct device *device,
+ u32 card_model, const struct lbs_fw_table *fw_table,
+ lbs_fw_cb callback)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&priv->driver_lock, flags);
+ if (priv->fw_callback) {
+ lbs_deb_fw("firmware load already in progress\n");
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+ return -EBUSY;
+ }
+
+ priv->fw_device = device;
+ priv->fw_callback = callback;
+ priv->fw_table = fw_table;
+ priv->fw_iter = NULL;
+ priv->fw_model = card_model;
+ spin_unlock_irqrestore(&priv->driver_lock, flags);
+
+ lbs_deb_fw("Starting async firmware load\n");
+ load_next_firmware_from_table(priv);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(lbs_get_firmware_async);
+
+/**
+ * lbs_get_firmware - Retrieves two-stage firmware
+ *
+ * @dev: A pointer to &device structure
+ * @card_model: Bus-specific card model ID used to filter firmware table
+ * elements
+ * @fw_table: Table of firmware file names and device model numbers
+ * terminated by an entry with a NULL helper name
+ * @helper: On success, the helper firmware; caller must free
+ * @mainfw: On success, the main firmware; caller must free
+ *
+ * Deprecated: use lbs_get_firmware_async() instead.
+ *
+ * returns: 0 on success, non-zero on failure
+ */
+int lbs_get_firmware(struct device *dev, u32 card_model,
+ const struct lbs_fw_table *fw_table,
+ const struct firmware **helper,
+ const struct firmware **mainfw)
+{
+ const struct lbs_fw_table *iter;
+ int ret;
+
+ BUG_ON(helper == NULL);
+ BUG_ON(mainfw == NULL);
+
+ /* Search for firmware to use from the table. */
+ iter = fw_table;
+ while (iter && iter->helper) {
+ if (iter->model != card_model)
+ goto next;
+
+ if (*helper == NULL) {
+ ret = request_firmware(helper, iter->helper, dev);
+ if (ret)
+ goto next;
+
+ /* If the device has one-stage firmware (ie cf8305) and
+ * we've got it then we don't need to bother with the
+ * main firmware.
+ */
+ if (iter->fwname == NULL)
+ return 0;
+ }
+
+ if (*mainfw == NULL) {
+ ret = request_firmware(mainfw, iter->fwname, dev);
+ if (ret) {
+ /* Clear the helper to ensure we don't have
+ * mismatched firmware pairs.
+ */
+ release_firmware(*helper);
+ *helper = NULL;
+ }
+ }
+
+ if (*helper && *mainfw)
+ return 0;
+
+ next:
+ iter++;
+ }
+
+ /* Failed */
+ release_firmware(*helper);
+ *helper = NULL;
+ release_firmware(*mainfw);
+ *mainfw = NULL;
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL_GPL(lbs_get_firmware);