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authorClemens Ladisch <clemens@ladisch.de>2009-02-19 07:44:12 (GMT)
committerTakashi Iwai <tiwai@suse.de>2009-02-19 09:22:26 (GMT)
commit1275d6f608abda23d101ada17dc39940192d4bc4 (patch)
tree17a9954dc31d2fa79494fe9b9b867a48a1dafc3e
parent30459d7b1843cbdea56ca120c8cac10dc5613e90 (diff)
downloadlinux-1275d6f608abda23d101ada17dc39940192d4bc4.tar.xz
sound: oxygen: automatically restore overwritten EEPROM
If the EEPROM was partially overwritten (which seems to happen before the OS is booted), restore its entire contents by deducing it from the remaining information. This does not have any effect on the Linux driver, which works even with incomplete information in the EEPROM, but it makes other drivers work again. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/oxygen/oxygen.h3
-rw-r--r--sound/pci/oxygen/oxygen_io.c16
-rw-r--r--sound/pci/oxygen/oxygen_lib.c29
3 files changed, 48 insertions, 0 deletions
diff --git a/sound/pci/oxygen/oxygen.h b/sound/pci/oxygen/oxygen.h
index c500d48..bd615db 100644
--- a/sound/pci/oxygen/oxygen.h
+++ b/sound/pci/oxygen/oxygen.h
@@ -18,6 +18,8 @@
#define OXYGEN_IO_SIZE 0x100
+#define OXYGEN_EEPROM_ID 0x434d /* "CM" */
+
/* model-specific configuration of outputs/inputs */
#define PLAYBACK_0_TO_I2S 0x0001
/* PLAYBACK_0_TO_AC97_0 not implemented */
@@ -190,6 +192,7 @@ void oxygen_reset_uart(struct oxygen *chip);
void oxygen_write_uart(struct oxygen *chip, u8 data);
u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index);
+void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value);
static inline void oxygen_set_bits8(struct oxygen *chip,
unsigned int reg, u8 value)
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c
index 05f48ef..c1eb923 100644
--- a/sound/pci/oxygen/oxygen_io.c
+++ b/sound/pci/oxygen/oxygen_io.c
@@ -269,3 +269,19 @@ u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index)
}
return oxygen_read16(chip, OXYGEN_EEPROM_DATA);
}
+
+void oxygen_write_eeprom(struct oxygen *chip, unsigned int index, u16 value)
+{
+ unsigned int timeout;
+
+ oxygen_write16(chip, OXYGEN_EEPROM_DATA, value);
+ oxygen_write8(chip, OXYGEN_EEPROM_CONTROL,
+ index | OXYGEN_EEPROM_DIR_WRITE);
+ for (timeout = 0; timeout < 10; ++timeout) {
+ msleep(1);
+ if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS)
+ & OXYGEN_EEPROM_BUSY))
+ return;
+ }
+ snd_printk(KERN_ERR "EEPROM write timeout\n");
+}
diff --git a/sound/pci/oxygen/oxygen_lib.c b/sound/pci/oxygen/oxygen_lib.c
index d83c3a9..6e1cdd2 100644
--- a/sound/pci/oxygen/oxygen_lib.c
+++ b/sound/pci/oxygen/oxygen_lib.c
@@ -272,6 +272,34 @@ oxygen_search_pci_id(struct oxygen *chip, const struct pci_device_id ids[])
return NULL;
}
+static void oxygen_restore_eeprom(struct oxygen *chip,
+ const struct pci_device_id *id)
+{
+ if (oxygen_read_eeprom(chip, 0) != OXYGEN_EEPROM_ID) {
+ /*
+ * This function gets called only when a known card model has
+ * been detected, i.e., we know there is a valid subsystem
+ * product ID at index 2 in the EEPROM. Therefore, we have
+ * been able to deduce the correct subsystem vendor ID, and
+ * this is enough information to restore the original EEPROM
+ * contents.
+ */
+ oxygen_write_eeprom(chip, 1, id->subvendor);
+ oxygen_write_eeprom(chip, 0, OXYGEN_EEPROM_ID);
+
+ oxygen_set_bits8(chip, OXYGEN_MISC,
+ OXYGEN_MISC_WRITE_PCI_SUBID);
+ pci_write_config_word(chip->pci, PCI_SUBSYSTEM_VENDOR_ID,
+ id->subvendor);
+ pci_write_config_word(chip->pci, PCI_SUBSYSTEM_ID,
+ id->subdevice);
+ oxygen_clear_bits8(chip, OXYGEN_MISC,
+ OXYGEN_MISC_WRITE_PCI_SUBID);
+
+ snd_printk(KERN_INFO "EEPROM ID restored\n");
+ }
+}
+
static void oxygen_init(struct oxygen *chip)
{
unsigned int i;
@@ -532,6 +560,7 @@ int oxygen_pci_probe(struct pci_dev *pci, int index, char *id,
err = -ENODEV;
goto err_pci_regions;
}
+ oxygen_restore_eeprom(chip, pci_id);
err = get_model(chip, pci_id);
if (err < 0)
goto err_pci_regions;