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/*
* Firmware loading and handling functions.
*/
#include <linux/firmware.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/sched.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);
}
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);
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