diff options
Diffstat (limited to 'sound/pci/emu10k1/io.c')
| -rw-r--r-- | sound/pci/emu10k1/io.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c index 5d116dd7403b..7d0cb9db4280 100644 --- a/sound/pci/emu10k1/io.c +++ b/sound/pci/emu10k1/io.c @@ -29,6 +29,7 @@ #include <linux/time.h> #include <sound/core.h> #include <sound/emu10k1.h> +#include <linux/delay.h> unsigned int snd_emu10k1_ptr_read(struct snd_emu10k1 * emu, unsigned int reg, unsigned int chn) { @@ -123,6 +124,41 @@ void snd_emu10k1_ptr20_write(struct snd_emu10k1 *emu, spin_unlock_irqrestore(&emu->emu_lock, flags); } +int snd_emu10k1_spi_write(struct snd_emu10k1 * emu, + unsigned int data) +{ + unsigned int reset, set; + unsigned int reg, tmp; + int n, result; + if (emu->card_capabilities->ca0108_chip) { + reg=0x3c; /* PTR20, reg 0x3c */ + } else { + return 1; /* For other cards types the SPI register is currently unknown. */ + } + if (data > 0xffff) return 1; /* Only 16bit values allowed */ + + tmp = snd_emu10k1_ptr20_read(emu, reg, 0); + reset = (tmp & ~0x3ffff) | 0x20000; /* Set xxx20000 */ + set = reset | 0x10000; /* Set xxx1xxxx */ + snd_emu10k1_ptr20_write(emu, reg, 0, reset | data); + tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* write post */ + snd_emu10k1_ptr20_write(emu, reg, 0, set | data); + result = 1; + /* Wait for status bit to return to 0 */ + for (n=0;n<100;n++) { + udelay(10); + tmp = snd_emu10k1_ptr20_read(emu, reg, 0); + if (!(tmp & 0x10000)) { + result=0; + break; + } + } + if (result) return 1; /* Timed out */ + snd_emu10k1_ptr20_write(emu, reg, 0, reset | data); + tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* Write post */ + return 0; +} + void snd_emu10k1_intr_enable(struct snd_emu10k1 *emu, unsigned int intrenb) { unsigned long flags; |