ALSA: hda - Load firmware in hda_intel.c

This is a preliminary work for the deferred probing for
request_firmware() errors at init.

This patch moves the call of request_firmware() to hda_intel.c, and
call it in the earlier stage of probing rather than
azx_probe_continue().

Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Reviewed-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_codec.h

@@ -1072,7 +1072,7 @@ static inline void snd_hda_power_down(struct hda_codec *codec) {}
 /*
  * patch firmware
  */
-int snd_hda_load_patch(struct hda_bus *bus, const char *patch);
+int snd_hda_load_patch(struct hda_bus *bus, size_t size, const void *buf);
 #endif
 
 /*

sound/pci/hda/hda_hwdep.c

@@ -25,7 +25,6 @@
 #include <linux/mutex.h>
 #include <linux/ctype.h>
 #include <linux/string.h>
-#include <linux/firmware.h>
 #include <linux/export.h>
 #include <sound/core.h>
 #include "hda_codec.h"
@@ -747,18 +746,21 @@ static int parse_line_mode(char *buf, struct hda_bus *bus)
  *
  * the spaces at the beginning and the end of the line are stripped
  */
-static int get_line_from_fw(char *buf, int size, struct firmware *fw)
+static int get_line_from_fw(char *buf, int size, size_t *fw_size_p,
+			    const void **fw_data_p)
 {
 	int len;
-	const char *p = fw->data;
-	while (isspace(*p) && fw->size) {
+	size_t fw_size = *fw_size_p;
+	const char *p = *fw_data_p;
+
+	while (isspace(*p) && fw_size) {
 		p++;
-		fw->size--;
+		fw_size--;
 	}
-	if (!fw->size)
+	if (!fw_size)
 		return 0;
 
-	for (len = 0; len < fw->size; len++) {
+	for (len = 0; len < fw_size; len++) {
 		if (!*p)
 			break;
 		if (*p == '\n') {
@@ -770,38 +772,24 @@ static int get_line_from_fw(char *buf, int size, struct firmware *fw)
 			*buf++ = *p++;
 	}
 	*buf = 0;
-	fw->size -= len;
-	fw->data = p;
+	*fw_size_p = fw_size - len;
+	*fw_data_p = p;
 	remove_trail_spaces(buf);
 	return 1;
 }
 
 /*
  * load a "patch" firmware file and parse it
  */
-int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
+int snd_hda_load_patch(struct hda_bus *bus, size_t fw_size, const void *fw_buf)
 {
-	int err;
-	const struct firmware *fw;
-	struct firmware tmp;
 	char buf[128];
 	struct hda_codec *codec;
 	int line_mode;
-	struct device *dev = bus->card->dev;
-
-	if (snd_BUG_ON(!dev))
-		return -ENODEV;
-	err = request_firmware(&fw, patch, dev);
-	if (err < 0) {
-		printk(KERN_ERR "hda-codec: Cannot load the patch '%s'\n",
-		       patch);
-		return err;
-	}
 
-	tmp = *fw;
 	line_mode = LINE_MODE_NONE;
 	codec = NULL;
-	while (get_line_from_fw(buf, sizeof(buf) - 1, &tmp)) {
+	while (get_line_from_fw(buf, sizeof(buf) - 1, &fw_size, &fw_buf)) {
 		if (!*buf || *buf == '#' || *buf == '\n')
 			continue;
 		if (*buf == '[')
@@ -810,7 +798,6 @@ int snd_hda_load_patch(struct hda_bus *bus, const char *patch)
 			 (codec || !patch_items[line_mode].need_codec))
 			patch_items[line_mode].parser(buf, bus, &codec);
 	}
-	release_firmware(fw);
 	return 0;
 }
 EXPORT_SYMBOL_HDA(snd_hda_load_patch);

sound/pci/hda/hda_intel.c

@@ -55,6 +55,7 @@
 #include <sound/initval.h>
 #include <linux/vgaarb.h>
 #include <linux/vga_switcheroo.h>
+#include <linux/firmware.h>
 #include "hda_codec.h"
 
 
@@ -470,6 +471,10 @@ struct azx {
 	struct snd_dma_buffer rb;
 	struct snd_dma_buffer posbuf;
 
+#ifdef CONFIG_SND_HDA_PATCH_LOADER
+	const struct firmware *fw;
+#endif
+
 	/* flags */
 	int position_fix[2]; /* for both playback/capture streams */
 	int poll_count;
@@ -2639,6 +2644,10 @@ static int azx_free(struct azx *chip)
 		pci_release_regions(chip->pci);
 	pci_disable_device(chip->pci);
 	kfree(chip->azx_dev);
+#ifdef CONFIG_SND_HDA_PATCH_LOADER
+	if (chip->fw)
+		release_firmware(chip->fw);
+#endif
 	kfree(chip);
 
 	return 0;
@@ -3167,14 +3176,23 @@ static int __devinit azx_probe(struct pci_dev *pci,
 		return err;
 	}
 
-	/* set this here since it's referred in snd_hda_load_patch() */
 	snd_card_set_dev(card, &pci->dev);
 
 	err = azx_create(card, pci, dev, pci_id->driver_data, &chip);
 	if (err < 0)
 		goto out_free;
 	card->private_data = chip;
 
+#ifdef CONFIG_SND_HDA_PATCH_LOADER
+	if (patch[dev] && *patch[dev]) {
+		snd_printk(KERN_ERR SFX "Applying patch firmware '%s'\n",
+			   patch[dev]);
+		err = request_firmware(&chip->fw, patch[dev], &pci->dev);
+		if (err < 0)
+			goto out_free;
+	}
+#endif /* CONFIG_SND_HDA_PATCH_LOADER */
+
 	if (!chip->disabled) {
 		err = azx_probe_continue(chip);
 		if (err < 0)
@@ -3205,12 +3223,13 @@ static int DELAYED_INIT_MARK azx_probe_continue(struct azx *chip)
 	if (err < 0)
 		goto out_free;
 #ifdef CONFIG_SND_HDA_PATCH_LOADER
-	if (patch[dev] && *patch[dev]) {
-		snd_printk(KERN_ERR SFX "Applying patch firmware '%s'\n",
-			   patch[dev]);
-		err = snd_hda_load_patch(chip->bus, patch[dev]);
+	if (chip->fw) {
+		err = snd_hda_load_patch(chip->bus, chip->fw->size,
+					 chip->fw->data);
 		if (err < 0)
 			goto out_free;
+		release_firmware(chip->fw); /* no longer needed */
+		chip->fw = NULL;
 	}
 #endif
 	if ((probe_only[dev] & 1) == 0) {