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228 lines
5.6 KiB
228 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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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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release_firmware (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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* @device: 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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