Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ALSA: ctxfi: Add ADC helper functions for GPIO
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
authored by
Harin Lee
and committed by
Takashi Iwai
4b490e0d
5ebd0542
+28
-9
+28
-9
sound/pci/ctxfi/cthw20k2.c
+28
-9
sound/pci/ctxfi/cthw20k2.c
···
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return 0;
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}
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+
static void hw_adc_stop(struct hw *hw)
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+
{
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u32 data;
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/* Reset the ADC (reset is active low). */
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data = hw_read_20kx(hw, GPIO_DATA);
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data &= ~(0x1 << 15);
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hw_write_20kx(hw, GPIO_DATA, data);
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usleep_range(10000, 11000);
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}
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+
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static void hw_adc_start(struct hw *hw)
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{
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u32 data;
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/* Return the ADC to normal operation. */
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data = hw_read_20kx(hw, GPIO_DATA);
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data |= (0x1 << 15);
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hw_write_20kx(hw, GPIO_DATA, data);
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msleep(50);
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}
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+
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+
static void __maybe_unused hw_adc_reset(struct hw *hw)
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{
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hw_adc_stop(hw);
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hw_adc_start(hw);
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}
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+
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static int hw_adc_init(struct hw *hw, const struct adc_conf *info)
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{
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int err;
···
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goto error;
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}
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-
/* Reset the ADC (reset is active low). */
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-
data = hw_read_20kx(hw, GPIO_DATA);
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-
data &= ~(0x1 << 15);
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-
hw_write_20kx(hw, GPIO_DATA, data);
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+
hw_adc_stop(hw);
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if (hw->model == CTSB1270) {
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/* Set up the PCM4220 ADC on Titanium HD */
···
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hw_write_20kx(hw, GPIO_DATA, data);
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}
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-
usleep_range(10000, 11000);
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-
/* Return the ADC to normal operation. */
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-
data |= (0x1 << 15);
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-
hw_write_20kx(hw, GPIO_DATA, data);
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-
msleep(50);
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+
hw_adc_start(hw);
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/* I2C write to register offset 0x0B to set ADC LRCLK polarity */
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/* invert bit, interface format to I2S, word length to 24-bit, */