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ALSA: ctxfi: Add ADC helper functions for GPIO

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Add helper functions hw_adc_stop(), hw_adc_start(), and hw_adc_reset()
to encapsulate ADC reset sequence operations. These functions reduce
duplication by centralizing the GPIO-based ADC control logic.

Signed-off-by: Harin Lee <me@harin.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20251124180501.2760421-3-me@harin.net
This commit is contained in:
Harin Lee 2025-11-25 03:04:57 +09:00 committed by Takashi Iwai
parent 5ebd054272
commit 4b490e0d10
1 changed files with 28 additions and 9 deletions
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37
sound/pci/ctxfi/cthw20k2.c
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@ -1826,6 +1826,32 @@ static int hw_adc_input_select(struct hw *hw, enum ADCSRC type)
return 0; return 0;
} }
static void hw_adc_stop(struct hw *hw)
{
u32 data;
/* Reset the ADC (reset is active low). */
data = hw_read_20kx(hw, GPIO_DATA);
data &= ~(0x1 << 15);
hw_write_20kx(hw, GPIO_DATA, data);
usleep_range(10000, 11000);
}
static void hw_adc_start(struct hw *hw)
{
u32 data;
/* Return the ADC to normal operation. */
data = hw_read_20kx(hw, GPIO_DATA);
data |= (0x1 << 15);
hw_write_20kx(hw, GPIO_DATA, data);
msleep(50);
}
static void __maybe_unused hw_adc_reset(struct hw *hw)
{
hw_adc_stop(hw);
hw_adc_start(hw);
}
static int hw_adc_init(struct hw *hw, const struct adc_conf *info) static int hw_adc_init(struct hw *hw, const struct adc_conf *info)
{ {
int err; int err;
@ -1843,10 +1869,7 @@ static int hw_adc_init(struct hw *hw, const struct adc_conf *info)
goto error; goto error;
} }
/* Reset the ADC (reset is active low). */ hw_adc_stop(hw);
data = hw_read_20kx(hw, GPIO_DATA);
data &= ~(0x1 << 15);
hw_write_20kx(hw, GPIO_DATA, data);
if (hw->model == CTSB1270) { if (hw->model == CTSB1270) {
/* Set up the PCM4220 ADC on Titanium HD */ /* Set up the PCM4220 ADC on Titanium HD */
@ -1860,11 +1883,7 @@ static int hw_adc_init(struct hw *hw, const struct adc_conf *info)
hw_write_20kx(hw, GPIO_DATA, data); hw_write_20kx(hw, GPIO_DATA, data);
} }
usleep_range(10000, 11000); hw_adc_start(hw);
/* Return the ADC to normal operation. */
data |= (0x1 << 15);
hw_write_20kx(hw, GPIO_DATA, data);
msleep(50);
/* I2C write to register offset 0x0B to set ADC LRCLK polarity */ /* I2C write to register offset 0x0B to set ADC LRCLK polarity */
/* invert bit, interface format to I2S, word length to 24-bit, */ /* invert bit, interface format to I2S, word length to 24-bit, */