diff options
Diffstat (limited to 'sound/pci/oxygen/oxygen_io.c')
| -rw-r--r-- | sound/pci/oxygen/oxygen_io.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sound/pci/oxygen/oxygen_io.c b/sound/pci/oxygen/oxygen_io.c index 3126c4b403dd..c1eb923f2ac9 100644 --- a/sound/pci/oxygen/oxygen_io.c +++ b/sound/pci/oxygen/oxygen_io.c @@ -254,3 +254,34 @@ void oxygen_write_uart(struct oxygen *chip, u8 data) _write_uart(chip, 0, data); } EXPORT_SYMBOL(oxygen_write_uart); + +u16 oxygen_read_eeprom(struct oxygen *chip, unsigned int index) +{ + unsigned int timeout; + + oxygen_write8(chip, OXYGEN_EEPROM_CONTROL, + index | OXYGEN_EEPROM_DIR_READ); + for (timeout = 0; timeout < 100; ++timeout) { + udelay(1); + if (!(oxygen_read8(chip, OXYGEN_EEPROM_STATUS) + & OXYGEN_EEPROM_BUSY)) + break; + } + 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"); +} |