diff options
Diffstat (limited to 'sound/pci/emu10k1/io.c')
| -rw-r--r-- | sound/pci/emu10k1/io.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/sound/pci/emu10k1/io.c b/sound/pci/emu10k1/io.c index 27ab7d1788a0..116e1c8d9361 100644 --- a/sound/pci/emu10k1/io.c +++ b/sound/pci/emu10k1/io.c @@ -30,6 +30,7 @@ #include <sound/core.h> #include <sound/emu10k1.h> #include <linux/delay.h> +#include "p17v.h" unsigned int snd_emu10k1_ptr_read(struct snd_emu10k1 * emu, unsigned int reg, unsigned int chn) { @@ -167,6 +168,64 @@ int snd_emu10k1_spi_write(struct snd_emu10k1 * emu, return 0; } +/* The ADC does not support i2c read, so only write is implemented */ +int snd_emu10k1_i2c_write(struct snd_emu10k1 *emu, + u32 reg, + u32 value) +{ + u32 tmp; + int timeout = 0; + int status; + int retry; + if ((reg > 0x7f) || (value > 0x1ff)) { + snd_printk(KERN_ERR "i2c_write: invalid values.\n"); + return -EINVAL; + } + + tmp = reg << 25 | value << 16; + // snd_printk("I2C-write:reg=0x%x, value=0x%x\n", reg, value); + /* Not sure what this I2C channel controls. */ + /* snd_emu10k1_ptr_write(emu, P17V_I2C_0, 0, tmp); */ + + /* This controls the I2C connected to the WM8775 ADC Codec */ + snd_emu10k1_ptr20_write(emu, P17V_I2C_1, 0, tmp); + tmp = snd_emu10k1_ptr20_read(emu, P17V_I2C_1, 0); /* write post */ + + for (retry = 0; retry < 10; retry++) { + /* Send the data to i2c */ + //tmp = snd_emu10k1_ptr_read(emu, P17V_I2C_ADDR, 0); + //tmp = tmp & ~(I2C_A_ADC_READ|I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD_MASK); + tmp = 0; + tmp = tmp | (I2C_A_ADC_LAST|I2C_A_ADC_START|I2C_A_ADC_ADD); + snd_emu10k1_ptr20_write(emu, P17V_I2C_ADDR, 0, tmp); + + /* Wait till the transaction ends */ + while (1) { + udelay(10); + status = snd_emu10k1_ptr20_read(emu, P17V_I2C_ADDR, 0); + // snd_printk("I2C:status=0x%x\n", status); + timeout++; + if ((status & I2C_A_ADC_START) == 0) + break; + + if (timeout > 1000) { + snd_printk("emu10k1:I2C:timeout status=0x%x\n", status); + break; + } + } + //Read back and see if the transaction is successful + if ((status & I2C_A_ADC_ABORT) == 0) + break; + } + + if (retry == 10) { + snd_printk(KERN_ERR "Writing to ADC failed!\n"); + return -EINVAL; + } + + return 0; +} + int snd_emu1010_fpga_write(struct snd_emu10k1 * emu, int reg, int value) { if (reg < 0 || reg > 0x3f) |