36eb22e97a
Signed-off-by: Duan Jiong <djduanjiong@gmail.com>
222 lines
5.4 KiB
C
222 lines
5.4 KiB
C
/*
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* Firmware loading and handling functions.
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*/
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#include <linux/sched.h>
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include "dev.h"
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#include "decl.h"
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static void load_next_firmware_from_table(struct lbs_private *private);
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static void lbs_fw_loaded(struct lbs_private *priv, int ret,
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const struct firmware *helper, const struct firmware *mainfw)
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{
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unsigned long flags;
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lbs_deb_fw("firmware load complete, code %d\n", ret);
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/* User must free helper/mainfw */
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priv->fw_callback(priv, ret, helper, mainfw);
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spin_lock_irqsave(&priv->driver_lock, flags);
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priv->fw_callback = NULL;
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wake_up(&priv->fw_waitq);
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spin_unlock_irqrestore(&priv->driver_lock, flags);
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}
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static void do_load_firmware(struct lbs_private *priv, const char *name,
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void (*cb)(const struct firmware *fw, void *context))
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{
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int ret;
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lbs_deb_fw("Requesting %s\n", name);
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ret = request_firmware_nowait(THIS_MODULE, true, name,
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priv->fw_device, GFP_KERNEL, priv, cb);
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if (ret) {
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lbs_deb_fw("request_firmware_nowait error %d\n", ret);
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lbs_fw_loaded(priv, ret, NULL, NULL);
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}
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}
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static void main_firmware_cb(const struct firmware *firmware, void *context)
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{
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struct lbs_private *priv = context;
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if (!firmware) {
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/* Failed to find firmware: try next table entry */
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load_next_firmware_from_table(priv);
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return;
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}
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/* Firmware found! */
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lbs_fw_loaded(priv, 0, priv->helper_fw, firmware);
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}
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static void helper_firmware_cb(const struct firmware *firmware, void *context)
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{
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struct lbs_private *priv = context;
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if (!firmware) {
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/* Failed to find firmware: try next table entry */
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load_next_firmware_from_table(priv);
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return;
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}
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/* Firmware found! */
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if (priv->fw_iter->fwname) {
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priv->helper_fw = firmware;
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do_load_firmware(priv, priv->fw_iter->fwname, main_firmware_cb);
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} else {
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/* No main firmware needed for this helper --> success! */
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lbs_fw_loaded(priv, 0, firmware, NULL);
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}
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}
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static void load_next_firmware_from_table(struct lbs_private *priv)
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{
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const struct lbs_fw_table *iter;
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if (!priv->fw_iter)
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iter = priv->fw_table;
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else
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iter = ++priv->fw_iter;
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if (priv->helper_fw) {
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release_firmware(priv->helper_fw);
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priv->helper_fw = NULL;
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}
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next:
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if (!iter->helper) {
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/* End of table hit. */
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lbs_fw_loaded(priv, -ENOENT, NULL, NULL);
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return;
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}
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if (iter->model != priv->fw_model) {
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iter++;
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goto next;
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}
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priv->fw_iter = iter;
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do_load_firmware(priv, iter->helper, helper_firmware_cb);
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}
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void lbs_wait_for_firmware_load(struct lbs_private *priv)
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{
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wait_event(priv->fw_waitq, priv->fw_callback == NULL);
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}
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/**
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* lbs_get_firmware_async - Retrieves firmware asynchronously. Can load
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* either a helper firmware and a main firmware (2-stage), or just the helper.
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*
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* @priv: Pointer to lbs_private instance
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* @dev: A pointer to &device structure
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* @card_model: Bus-specific card model ID used to filter firmware table
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* elements
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* @fw_table: Table of firmware file names and device model numbers
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* terminated by an entry with a NULL helper name
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* @callback: User callback to invoke when firmware load succeeds or fails.
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*/
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int lbs_get_firmware_async(struct lbs_private *priv, struct device *device,
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u32 card_model, const struct lbs_fw_table *fw_table,
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lbs_fw_cb callback)
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{
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unsigned long flags;
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spin_lock_irqsave(&priv->driver_lock, flags);
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if (priv->fw_callback) {
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lbs_deb_fw("firmware load already in progress\n");
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spin_unlock_irqrestore(&priv->driver_lock, flags);
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return -EBUSY;
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}
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priv->fw_device = device;
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priv->fw_callback = callback;
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priv->fw_table = fw_table;
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priv->fw_iter = NULL;
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priv->fw_model = card_model;
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spin_unlock_irqrestore(&priv->driver_lock, flags);
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lbs_deb_fw("Starting async firmware load\n");
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load_next_firmware_from_table(priv);
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return 0;
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}
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EXPORT_SYMBOL_GPL(lbs_get_firmware_async);
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/**
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* lbs_get_firmware - Retrieves two-stage firmware
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*
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* @dev: A pointer to &device structure
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* @card_model: Bus-specific card model ID used to filter firmware table
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* elements
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* @fw_table: Table of firmware file names and device model numbers
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* terminated by an entry with a NULL helper name
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* @helper: On success, the helper firmware; caller must free
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* @mainfw: On success, the main firmware; caller must free
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*
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* Deprecated: use lbs_get_firmware_async() instead.
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*
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* returns: 0 on success, non-zero on failure
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*/
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int lbs_get_firmware(struct device *dev, u32 card_model,
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const struct lbs_fw_table *fw_table,
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const struct firmware **helper,
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const struct firmware **mainfw)
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{
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const struct lbs_fw_table *iter;
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int ret;
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BUG_ON(helper == NULL);
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BUG_ON(mainfw == NULL);
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/* Search for firmware to use from the table. */
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iter = fw_table;
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while (iter && iter->helper) {
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if (iter->model != card_model)
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goto next;
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if (*helper == NULL) {
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ret = request_firmware(helper, iter->helper, dev);
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if (ret)
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goto next;
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/* If the device has one-stage firmware (ie cf8305) and
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* we've got it then we don't need to bother with the
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* main firmware.
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*/
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if (iter->fwname == NULL)
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return 0;
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}
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if (*mainfw == NULL) {
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ret = request_firmware(mainfw, iter->fwname, dev);
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if (ret) {
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/* Clear the helper to ensure we don't have
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* mismatched firmware pairs.
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*/
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release_firmware(*helper);
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*helper = NULL;
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}
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}
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if (*helper && *mainfw)
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return 0;
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next:
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iter++;
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}
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/* Failed */
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release_firmware(*helper);
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*helper = NULL;
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release_firmware(*mainfw);
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*mainfw = NULL;
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return -ENOENT;
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}
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EXPORT_SYMBOL_GPL(lbs_get_firmware);
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