Re: [PATCH v2 2/3] ASoC: codecs: Add support for the Renesas IDT821034 codec

Herve Codina
2023-01-23T08:56:47Z

Hi Christophe,

On Mon, 23 Jan 2023 07:53:49 +0000
Christophe Leroy <christophe.leroy@csgroup.eu> wrote:

> Le 20/01/2023 à 10:50, Herve Codina a écrit :
> > The Renesas IDT821034 codec is four channel PCM codec with on-chip
> > filters and programmable gain setting.
> > It also provides SLIC (Subscriber Line Interface Circuit) signals as
> > GPIOs.
> >
> > Signed-off-by: Herve Codina <herve.codina@bootlin.com>
> > ---
> > sound/soc/codecs/Kconfig | 12 +
> > sound/soc/codecs/Makefile | 2 +
> > sound/soc/codecs/idt821034.c | 1200 ++++++++++++++++++++++++++++++++++
> > 3 files changed, 1214 insertions(+)
> > create mode 100644 sound/soc/codecs/idt821034.c
> >
> > diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> > index 0f9d71490075..67489b2ebd9f 100644
> > --- a/sound/soc/codecs/Kconfig
> > +++ b/sound/soc/codecs/Kconfig
> > @@ -107,6 +107,7 @@ config SND_SOC_ALL_CODECS
> > imply SND_SOC_HDAC_HDMI
> > imply SND_SOC_HDAC_HDA
> > imply SND_SOC_ICS43432
> > + imply SND_SOC_IDT821034
> > imply SND_SOC_INNO_RK3036
> > imply SND_SOC_ISABELLE
> > imply SND_SOC_JZ4740_CODEC
> > @@ -972,6 +973,17 @@ config SND_SOC_HDA
> > config SND_SOC_ICS43432
> > tristate "ICS43423 and compatible i2s microphones"
> >
> > +config SND_SOC_IDT821034
> > + tristate "Renesas IDT821034 quad PCM codec"
> > + depends on SPI
> > + select REGMAP_SPI
>
> Is selecting regmap still necessary ?

Indeed, REGMAP_SPI is not needed anymore.
Will be fixed in v3.

>
> > + help
> > + Enable support for the Renesas IDT821034 quad PCM with
> > + programmable gain codec.
> > +
> > + To compile this driver as a module, choose M here: the module
> > + will be called snd-soc-idt821034.
> > +
> > config SND_SOC_INNO_RK3036
> > tristate "Inno codec driver for RK3036 SoC"
> > select REGMAP_MMIO
> > diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
> > index 71d3ce5867e4..bcf95de654fd 100644
> > --- a/sound/soc/codecs/Makefile
> > +++ b/sound/soc/codecs/Makefile
> > @@ -111,6 +111,7 @@ snd-soc-hdac-hdmi-objs := hdac_hdmi.o
> > snd-soc-hdac-hda-objs := hdac_hda.o
> > snd-soc-hda-codec-objs := hda.o hda-dai.o
> > snd-soc-ics43432-objs := ics43432.o
> > +snd-soc-idt821034-objs := idt821034.o
> > snd-soc-inno-rk3036-objs := inno_rk3036.o
> > snd-soc-isabelle-objs := isabelle.o
> > snd-soc-jz4740-codec-objs := jz4740.o
> > @@ -472,6 +473,7 @@ obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
> > obj-$(CONFIG_SND_SOC_HDAC_HDA) += snd-soc-hdac-hda.o
> > obj-$(CONFIG_SND_SOC_HDA) += snd-soc-hda-codec.o
> > obj-$(CONFIG_SND_SOC_ICS43432) += snd-soc-ics43432.o
> > +obj-$(CONFIG_SND_SOC_IDT821034) += snd-soc-idt821034.o
> > obj-$(CONFIG_SND_SOC_INNO_RK3036) += snd-soc-inno-rk3036.o
> > obj-$(CONFIG_SND_SOC_ISABELLE) += snd-soc-isabelle.o
> > obj-$(CONFIG_SND_SOC_JZ4740_CODEC) += snd-soc-jz4740-codec.o
> > diff --git a/sound/soc/codecs/idt821034.c b/sound/soc/codecs/idt821034.c
> > new file mode 100644
> > index 000000000000..5eb93fec6042
> > --- /dev/null
> > +++ b/sound/soc/codecs/idt821034.c
> > @@ -0,0 +1,1200 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +//
> > +// IDT821034 ALSA SoC driver
> > +//
> > +// Copyright 2022 CS GROUP France
> > +//
> > +// Author: Herve Codina <herve.codina@bootlin.com>
> > +
> > +#include <linux/bitrev.h>
> > +#include <linux/gpio/driver.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
> > +#include <linux/spi/spi.h>
> > +#include <sound/pcm_params.h>
> > +#include <sound/soc.h>
> > +#include <sound/tlv.h>
> > +
> > +#define IDT821034_NB_CHANNEL 4
> > +
> > +struct idt821034_amp {
> > + u16 gain;
> > + bool is_muted;
> > +};
> > +
> > +struct idt821034 {
> > + struct spi_device *spi;
> > + struct mutex mutex;
> > + u8 spi_tx_buf; /* Cannot use stack area for SPI (dma-safe memory) */
> > + u8 spi_rx_buf; /* Cannot use stack area for SPI (dma-safe memory) */
> > + struct {
> > + u8 codec_conf;
> > + struct {
> > + u8 power;
> > + u8 tx_slot;
> > + u8 rx_slot;
> > + u8 slic_conf;
> > + u8 slic_control;
> > + } ch[IDT821034_NB_CHANNEL];
> > + } cache;
> > + struct {
> > + struct {
> > + struct idt821034_amp amp_out;
> > + struct idt821034_amp amp_in;
> > + } ch[IDT821034_NB_CHANNEL];
> > + } amps;
> > + int max_ch_playback;
> > + int max_ch_capture;
> > + struct gpio_chip gpio_chip;
> > +};
> > +
> > +static int idt821034_8bit_write(struct idt821034 *idt821034, u8 val)
> > +{
> > + struct spi_transfer xfer[] = {
> > + {
> > + .tx_buf = &idt821034->spi_tx_buf,
> > + .len = 1,
> > + }, {
> > + .cs_off = 1,
> > + .tx_buf = &idt821034->spi_tx_buf,
> > + .len = 1,
> > + }
> > + };
> > + int ret;
> > +
> > + idt821034->spi_tx_buf = val;
> > +
> > + dev_vdbg(&idt821034->spi->dev, "spi xfer wr 0x%x\n", val);
> > +
> > + ret = spi_sync_transfer(idt821034->spi, xfer, 2);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
>
> Looks like you could just do:
>
> return spi_sync_transfer(idt821034->spi, xfer, 2);

Yes, I will change in v3.

>
> > +}
> > +
> > +static int idt821034_8bit_read(struct idt821034 *idt821034, u8 valw, u8 *valr)
> > +{
> > + struct spi_transfer xfer[] = {
> > + {
> > + .tx_buf = &idt821034->spi_tx_buf,
> > + .rx_buf = &idt821034->spi_rx_buf,
> > + .len = 1,
> > + }, {
> > + .cs_off = 1,
> > + .tx_buf = &idt821034->spi_tx_buf,
> > + .len = 1,
> > + }
> > + };
> > + int ret;
> > +
> > + idt821034->spi_tx_buf = valw;
> > +
> > + ret = spi_sync_transfer(idt821034->spi, xfer, 2);
> > + if (ret)
> > + return ret;
> > +
> > + *valr = idt821034->spi_rx_buf;
> > +
> > + dev_vdbg(&idt821034->spi->dev, "spi xfer wr 0x%x, rd 0x%x\n",
> > + valw, *valr);
> > +
> > + return 0;
> > +}
> > +
> > +/* Available mode the programming sequence */
>
> s/the/for/ ?

Sure, I will change in v3.

>
> > +#define IDT821034_MODE_CODEC(_ch) (0x80 | ((_ch) << 2))
> > +#define IDT821034_MODE_SLIC(_ch) (0xD0 | ((_ch) << 2))
> > +#define IDT821034_MODE_GAIN(_ch) (0xC0 | ((_ch) << 2))
> > +
> > +/* Power values that can be used in 'power' (can be ORed) */
> > +#define IDT821034_CONF_PWRUP_TX BIT(1) /* from analog input to PCM */
> > +#define IDT821034_CONF_PWRUP_RX BIT(0) /* from PCM to analog output */
> > +
> > +static int idt821034_set_channel_power(struct idt821034 *idt821034, u8 ch, u8 power)
> > +{
> > + u8 conf;
> > + int ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "set_channel_power(%u, 0x%x)\n", ch, power);
> > +
> > + conf = IDT821034_MODE_CODEC(ch) | idt821034->cache.codec_conf;
> > +
> > + if (power & IDT821034_CONF_PWRUP_RX) {
> > + ret = idt821034_8bit_write(idt821034, conf | IDT821034_CONF_PWRUP_RX);
> > + if (ret)
> > + return ret;
> > + ret = idt821034_8bit_write(idt821034, idt821034->cache.ch[ch].rx_slot);
> > + if (ret)
> > + return ret;
> > + }
> > + if (power & IDT821034_CONF_PWRUP_TX) {
> > + ret = idt821034_8bit_write(idt821034, conf | IDT821034_CONF_PWRUP_TX);
> > + if (ret)
> > + return ret;
> > + ret = idt821034_8bit_write(idt821034, idt821034->cache.ch[ch].tx_slot);
> > + if (ret)
> > + return ret;
> > + }
> > + if (!(power & (IDT821034_CONF_PWRUP_TX | IDT821034_CONF_PWRUP_RX))) {
> > + ret = idt821034_8bit_write(idt821034, conf);
> > + if (ret)
> > + return ret;
> > + ret = idt821034_8bit_write(idt821034, 0x00);
> > + if (ret)
> > + return ret;
> > + }
>
> Can we refactor the three actions with an helper, that could also be
> reused for idt821034_set_codec_conf() and idt821034_set_channel_ts() and
> idt821034_set_slic_conf() and idt821034_write_slic_raw() and
> idt821034_set_gain_channel, something like for instance:
>
> static int idt821034_set_conf(struct idt821034 *idt821034, u8 conf, u8 val)
> {
> ret = idt821034_8bit_write(idt821034, conf);
> if (ret)
> return ret;
> return idt821034_8bit_write(idt821034, val);
> }

It can be changed.
The function name will not be idt821034_set_conf() as it is not the same
kind of funtion as the idt821031_set_*() already available in the code.
What do you think about:
static int idt821034_2x8bit_write(struct idt821034 *idt821034, u8 val1, u8 val2)
or
static int idt821034_conf_write(struct idt821034 *idt821034, u8 conf, u8 val)

I prefer the first one but it is only a personal preference.
On your side, what do you prefer ?

>
> > +
> > + idt821034->cache.ch[ch].power = power;
> > +
> > + return 0;
> > +}
> > +
> > +static u8 idt821034_get_channel_power(struct idt821034 *idt821034, u8 ch)
> > +{
> > + return idt821034->cache.ch[ch].power;
> > +}
> > +
> > +/* Codec configuration values that can be used in 'codec_conf' (can be ORed) */
> > +#define IDT821034_CONF_ALAW_MODE BIT(5)
> > +#define IDT821034_CONF_DELAY_MODE BIT(4)
> > +
> > +static int idt821034_set_codec_conf(struct idt821034 *idt821034, u8 codec_conf)
> > +{
> > + u8 conf;
> > + u8 ts;
> > + int ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "set_codec_conf(0x%x)\n", codec_conf);
> > +
> > + /* codec conf fields are common to all channel.
> > + * Arbitrary use of channel 0 for this configuration.
> > + */
> > +
> > + /* Set Configuration Register */
> > + conf = IDT821034_MODE_CODEC(0) | codec_conf;
> > +
> > + /* Update conf value and timeslot register value according
> > + * to cache values
> > + */
> > + if (idt821034->cache.ch[0].power & IDT821034_CONF_PWRUP_RX) {
> > + conf |= IDT821034_CONF_PWRUP_RX;
> > + ts = idt821034->cache.ch[0].rx_slot;
> > + } else if (idt821034->cache.ch[0].power & IDT821034_CONF_PWRUP_TX) {
> > + conf |= IDT821034_CONF_PWRUP_TX;
> > + ts = idt821034->cache.ch[0].tx_slot;
> > + } else {
> > + ts = 0x00;
> > + }
> > +
> > + /* Write configuration register and time-slot register */
> > + ret = idt821034_8bit_write(idt821034, conf);
> > + if (ret)
> > + return ret;
> > + ret = idt821034_8bit_write(idt821034, ts);
> > + if (ret)
> > + return ret;
> > +
> > + idt821034->cache.codec_conf = codec_conf;
> > + return 0;
> > +}
> > +
> > +static u8 idt821034_get_codec_conf(struct idt821034 *idt821034)
> > +{
> > + return idt821034->cache.codec_conf;
> > +}
> > +
> > +/* Channel direction values that can be used in 'ch_dir' (can be ORed) */
> > +#define IDT821034_CH_RX BIT(0) /* from PCM to analog output */
> > +#define IDT821034_CH_TX BIT(1) /* from analog input to PCM */
> > +
> > +static int idt821034_set_channel_ts(struct idt821034 *idt821034, u8 ch, u8 ch_dir, u8 ts_num)
> > +{
> > + u8 conf;
> > + int ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "set_channel_ts(%u, 0x%x, %d)\n", ch, ch_dir, ts_num);
> > +
> > + conf = IDT821034_MODE_CODEC(ch) | idt821034->cache.codec_conf;
> > +
> > + if (ch_dir & IDT821034_CH_RX) {
> > + if (idt821034->cache.ch[ch].power & IDT821034_CONF_PWRUP_RX) {
> > + ret = idt821034_8bit_write(idt821034, conf | IDT821034_CONF_PWRUP_RX);
> > + if (ret)
> > + return ret;
> > + ret = idt821034_8bit_write(idt821034, ts_num);
> > + if (ret)
> > + return ret;
> > + }
> > + idt821034->cache.ch[ch].rx_slot = ts_num;
> > + }
> > + if (ch_dir & IDT821034_CH_TX) {
> > + if (idt821034->cache.ch[ch].power & IDT821034_CONF_PWRUP_TX) {
> > + ret = idt821034_8bit_write(idt821034, conf | IDT821034_CONF_PWRUP_TX);
> > + if (ret)
> > + return ret;
> > + ret = idt821034_8bit_write(idt821034, ts_num);
> > + if (ret)
> > + return ret;
> > + }
> > + idt821034->cache.ch[ch].tx_slot = ts_num;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +/* SLIC direction values that can be used in 'slic_dir' (can be ORed) */
> > +#define IDT821034_SLIC_IO1_IN BIT(1)
> > +#define IDT821034_SLIC_IO0_IN BIT(0)
> > +
> > +static int idt821034_set_slic_conf(struct idt821034 *idt821034, u8 ch, u8 slic_dir)
> > +{
> > + u8 conf;
> > + int ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "set_slic_conf(%u, 0x%x)\n", ch, slic_dir);
> > +
> > + conf = IDT821034_MODE_SLIC(ch) | slic_dir;
> > + ret = idt821034_8bit_write(idt821034, conf);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_8bit_write(idt821034, idt821034->cache.ch[ch].slic_control);
> > + if (ret)
> > + return ret;
> > +
> > + idt821034->cache.ch[ch].slic_conf = slic_dir;
> > +
> > + return 0;
> > +}
> > +
> > +static u8 idt821034_get_slic_conf(struct idt821034 *idt821034, u8 ch)
> > +{
> > + return idt821034->cache.ch[ch].slic_conf;
> > +}
> > +
> > +static int idt821034_write_slic_raw(struct idt821034 *idt821034, u8 ch, u8 slic_raw)
> > +{
> > + u8 conf;
> > + int ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "write_slic_raw(%u, 0x%x)\n", ch, slic_raw);
> > +
> > + /*
> > + * On write, slic_raw is mapped as follow :
> > + * b4: O_4
> > + * b3: O_3
> > + * b2: O_2
> > + * b1: I/O_1
> > + * b0: I/O_0
> > + */
> > +
> > + conf = IDT821034_MODE_SLIC(ch) | idt821034->cache.ch[ch].slic_conf;
> > + ret = idt821034_8bit_write(idt821034, conf);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_8bit_write(idt821034, slic_raw);
> > + if (ret)
> > + return ret;
> > +
> > + idt821034->cache.ch[ch].slic_control = slic_raw;
> > + return 0;
> > +}
> > +
> > +static u8 idt821034_get_written_slic_raw(struct idt821034 *idt821034, u8 ch)
> > +{
> > + return idt821034->cache.ch[ch].slic_control;
> > +}
> > +
> > +static int idt821034_read_slic_raw(struct idt821034 *idt821034, u8 ch, u8 *slic_raw)
> > +{
> > + u8 val;
> > + int ret;
> > +
> > + /*
> > + * On read, slic_raw is mapped as follow :
> > + * b7: I/O_0
> > + * b6: I/O_1
> > + * b5: O_2
> > + * b4: O_3
> > + * b3: O_4
> > + * b2: I/O1_0, I/O_0 from channel 1 (no matter ch value)
> > + * b1: I/O2_0, I/O_0 from channel 2 (no matter ch value)
> > + * b2: I/O3_0, I/O_0 from channel 3 (no matter ch value)
> > + */
> > +
> > + val = IDT821034_MODE_SLIC(ch) | idt821034->cache.ch[ch].slic_conf;
> > + ret = idt821034_8bit_write(idt821034, val);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_8bit_read(idt821034, idt821034->cache.ch[ch].slic_control, slic_raw);
> > + if (ret)
> > + return ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "read_slic_raw(%i) 0x%x\n", ch, *slic_raw);
> > +
> > + return 0;
> > +}
> > +
> > +/* Gain type values that can be used in 'gain_type' (cannot be ORed) */
> > +#define IDT821034_GAIN_RX (0 << 1) /* from PCM to analog output */
> > +#define IDT821034_GAIN_TX (1 << 1) /* from analog input to PCM */
> > +
> > +static int idt821034_set_gain_channel(struct idt821034 *idt821034, u8 ch,
> > + u8 gain_type, u16 gain_val)
> > +{
> > + u8 conf;
> > + int ret;
> > +
> > + dev_dbg(&idt821034->spi->dev, "set_gain_channel(%u, 0x%x, 0x%x-%d)\n",
> > + ch, gain_type, gain_val, gain_val);
> > +
> > + /*
> > + * The gain programming coefficients should be calculated as:
> > + * Transmit : Coeff_X = round [ gain_X0dB × gain_X ]
> > + * Receive: Coeff_R = round [ gain_R0dB × gain_R ]
> > + * where:
> > + * gain_X0dB = 1820;
> > + * gain_X is the target gain;
> > + * Coeff_X should be in the range of 0 to 8192.
> > + * gain_R0dB = 2506;
> > + * gain_R is the target gain;
> > + * Coeff_R should be in the range of 0 to 8192.
> > + *
> > + * A gain programming coefficient is 14-bit wide and in binary format.
> > + * The 7 Most Significant Bits of the coefficient is called
> > + * GA_MSB_Transmit for transmit path, or is called GA_MSB_Receive for
> > + * receive path; The 7 Least Significant Bits of the coefficient is
> > + * called GA_LSB_ Transmit for transmit path, or is called
> > + * GA_LSB_Receive for receive path.
> > + *
> > + * An example is given below to clarify the calculation of the
> > + * coefficient. To program a +3 dB gain in transmit path and a -3.5 dB
> > + * gain in receive path:
> > + *
> > + * Linear Code of +3dB = 10^(3/20)= 1.412537545
> > + * Coeff_X = round (1820 × 1.412537545) = 2571
> > + * = 0b001010_00001011
> > + * GA_MSB_Transmit = 0b0010100
> > + * GA_LSB_Transmit = 0b0001011
> > + *
> > + * Linear Code of -3.5dB = 10^(-3.5/20) = 0.668343917
> > + * Coeff_R= round (2506 × 0.668343917) = 1675
> > + * = 0b0001101_0001011
> > + * GA_MSB_Receive = 0b0001101
> > + * GA_LSB_Receive = 0b0001011
> > + */
> > +
> > + conf = IDT821034_MODE_GAIN(ch) | gain_type;
> > +
> > + ret = idt821034_8bit_write(idt821034, conf | 0x00);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_8bit_write(idt821034, gain_val & 0x007F);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_8bit_write(idt821034, conf | 0x01);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_8bit_write(idt821034, (gain_val >> 7) & 0x7F);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +/* Id helpers used in controls and dapm */
> > +#define IDT821034_DIR_OUT (1 << 3)
> > +#define IDT821034_DIR_IN (0 << 3)
> > +#define IDT821034_ID(_ch, _dir) (((_ch) & 0x03) | (_dir))
> > +#define IDT821034_ID_OUT(_ch) IDT821034_ID(_ch, IDT821034_DIR_OUT)
> > +#define IDT821034_ID_IN(_ch) IDT821034_ID(_ch, IDT821034_DIR_IN)
> > +
> > +#define IDT821034_ID_GET_CHAN(_id) ((_id) & 0x03)
> > +#define IDT821034_ID_GET_DIR(_id) ((_id) & (1 << 3))
> > +#define IDT821034_ID_IS_OUT(_id) (IDT821034_ID_GET_DIR(_id) == IDT821034_DIR_OUT)
> > +
> > +static int idt821034_kctrl_gain_get(struct snd_kcontrol *kcontrol,
> > + struct snd_ctl_elem_value *ucontrol)
> > +{
> > + struct soc_mixer_control *mc = (struct soc_mixer_control *)kcontrol->private_value;
> > + struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
> > + int min = mc->min;
> > + int max = mc->max;
> > + unsigned int mask = (1 << fls(max)) - 1;
> > + unsigned int invert = mc->invert;
> > + int val;
> > + u8 ch;
> > +
> > + ch = IDT821034_ID_GET_CHAN(mc->reg);
> > +
> > + mutex_lock(&idt821034->mutex);
> > + if (IDT821034_ID_IS_OUT(mc->reg))
> > + val = idt821034->amps.ch[ch].amp_out.gain;
> > + else
> > + val = idt821034->amps.ch[ch].amp_in.gain;
> > + mutex_unlock(&idt821034->mutex);
> > +
> > + ucontrol->value.integer.value[0] = val & mask;
> > + if (invert)
> > + ucontrol->value.integer.value[0] = max - ucontrol->value.integer.value[0];
> > + else
> > + ucontrol->value.integer.value[0] = ucontrol->value.integer.value[0] - min;
> > +
> > + return 0;
> > +}
> > +
> > +static int idt821034_kctrl_gain_put(struct snd_kcontrol *kcontrol,
> > + struct snd_ctl_elem_value *ucontrol)
> > +{
> > + struct soc_mixer_control *mc = (struct soc_mixer_control *)kcontrol->private_value;
> > + struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
> > + struct idt821034_amp *amp;
> > + int min = mc->min;
> > + int max = mc->max;
> > + unsigned int mask = (1 << fls(max)) - 1;
> > + unsigned int invert = mc->invert;
> > + unsigned int val;
> > + int ret;
> > + u8 gain_type;
> > + u8 ch;
> > +
> > + val = ucontrol->value.integer.value[0];
> > + if (val < 0)
> > + return -EINVAL;
> > + if (val > max - min)
> > + return -EINVAL;
> > +
> > + if (invert)
> > + val = (max - val) & mask;
> > + else
> > + val = (val + min) & mask;
> > +
> > + ch = IDT821034_ID_GET_CHAN(mc->reg);
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + if (IDT821034_ID_IS_OUT(mc->reg)) {
> > + amp = &idt821034->amps.ch[ch].amp_out;
> > + gain_type = IDT821034_GAIN_RX;
> > + } else {
> > + amp = &idt821034->amps.ch[ch].amp_in;
> > + gain_type = IDT821034_GAIN_TX;
> > + }
> > +
> > + if (!amp->is_muted) {
> > + ret = idt821034_set_gain_channel(idt821034, ch, gain_type, val);
> > + if (ret)
> > + goto end;
> > + }
> > +
> > + amp->gain = val;
> > + ret = 0;
> > +end:
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static int idt821034_kctrl_mute_get(struct snd_kcontrol *kcontrol,
> > + struct snd_ctl_elem_value *ucontrol)
> > +{
> > + struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
> > + int id = kcontrol->private_value;
> > + bool is_muted;
> > + u8 ch;
> > +
> > + ch = IDT821034_ID_GET_CHAN(id);
> > +
> > + mutex_lock(&idt821034->mutex);
> > + is_muted = IDT821034_ID_IS_OUT(id) ?
> > + idt821034->amps.ch[ch].amp_out.is_muted:
> > + idt821034->amps.ch[ch].amp_in.is_muted;
> > + mutex_unlock(&idt821034->mutex);
> > +
> > + ucontrol->value.integer.value[0] = !is_muted;
> > +
> > + return 0;
> > +}
> > +
> > +static int idt821034_kctrl_mute_put(struct snd_kcontrol *kcontrol,
> > + struct snd_ctl_elem_value *ucontrol)
> > +{
> > + struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
> > + int id = kcontrol->private_value;
> > + struct idt821034_amp *amp;
> > + bool is_mute;
> > + u8 gain_type;
> > + int ret;
> > + u8 ch;
> > +
> > + ch = IDT821034_ID_GET_CHAN(id);
> > + is_mute = !ucontrol->value.integer.value[0];
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + if (IDT821034_ID_IS_OUT(id)) {
> > + amp = &idt821034->amps.ch[ch].amp_out;
> > + gain_type = IDT821034_GAIN_RX;
> > + } else {
> > + amp = &idt821034->amps.ch[ch].amp_in;
> > + gain_type = IDT821034_GAIN_TX;
> > + }
> > +
> > + ret = idt821034_set_gain_channel(idt821034, ch, gain_type,
> > + is_mute ? 0 : amp->gain);
> > + if (ret)
> > + goto end;
> > +
> > + amp->is_muted = is_mute;
> > +
> > + ret = 0;
> > +end:
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static const DECLARE_TLV_DB_LINEAR(idt821034_gain_in, -6520, 1306);
> > +#define IDT821034_GAIN_IN_MIN_RAW 1 /* -65.20 dB -> 10^(-65.2/20.0) * 1820 = 1 */
> > +#define IDT821034_GAIN_IN_MAX_RAW 8191 /* 13.06 dB -> 10^(13.06/20.0) * 1820 = 8191 */
> > +#define IDT821034_GAIN_IN_INIT_RAW 1820 /* 0dB -> 10^(0/20) * 1820 = 1820 */
> > +
> > +static const DECLARE_TLV_DB_LINEAR(idt821034_gain_out, -6798, 1029);
> > +#define IDT821034_GAIN_OUT_MIN_RAW 1 /* -67.98 dB -> 10^(-67.98/20.0) * 2506 = 1*/
> > +#define IDT821034_GAIN_OUT_MAX_RAW 8191 /* 10.29 dB -> 10^(10.29/20.0) * 2506 = 8191 */
> > +#define IDT821034_GAIN_OUT_INIT_RAW 2506 /* 0dB -> 10^(0/20) * 2506 = 2506 */
> > +
> > +static const struct snd_kcontrol_new idt821034_controls[] = {
> > + /* DAC volume control */
> > + SOC_SINGLE_RANGE_EXT_TLV("DAC0 Playback Volume", IDT821034_ID_OUT(0), 0,
> > + IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_out),
> > + SOC_SINGLE_RANGE_EXT_TLV("DAC1 Playback Volume", IDT821034_ID_OUT(1), 0,
> > + IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_out),
> > + SOC_SINGLE_RANGE_EXT_TLV("DAC2 Playback Volume", IDT821034_ID_OUT(2), 0,
> > + IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_out),
> > + SOC_SINGLE_RANGE_EXT_TLV("DAC3 Playback Volume", IDT821034_ID_OUT(3), 0,
> > + IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_out),
> > +
> > + /* DAC mute control */
> > + SOC_SINGLE_BOOL_EXT("DAC0 Playback Switch", IDT821034_ID_OUT(0),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > + SOC_SINGLE_BOOL_EXT("DAC1 Playback Switch", IDT821034_ID_OUT(1),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > + SOC_SINGLE_BOOL_EXT("DAC2 Playback Switch", IDT821034_ID_OUT(2),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > + SOC_SINGLE_BOOL_EXT("DAC3 Playback Switch", IDT821034_ID_OUT(3),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > +
> > + /* ADC volume control */
> > + SOC_SINGLE_RANGE_EXT_TLV("ADC0 Capture Volume", IDT821034_ID_IN(0), 0,
> > + IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_in),
> > + SOC_SINGLE_RANGE_EXT_TLV("ADC1 Capture Volume", IDT821034_ID_IN(1), 0,
> > + IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_in),
> > + SOC_SINGLE_RANGE_EXT_TLV("ADC2 Capture Volume", IDT821034_ID_IN(2), 0,
> > + IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_in),
> > + SOC_SINGLE_RANGE_EXT_TLV("ADC3 Capture Volume", IDT821034_ID_IN(3), 0,
> > + IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
> > + 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
> > + idt821034_gain_in),
> > +
> > + /* ADC mute control */
> > + SOC_SINGLE_BOOL_EXT("ADC0 Capture Switch", IDT821034_ID_IN(0),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > + SOC_SINGLE_BOOL_EXT("ADC1 Capture Switch", IDT821034_ID_IN(1),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > + SOC_SINGLE_BOOL_EXT("ADC2 Capture Switch", IDT821034_ID_IN(2),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > + SOC_SINGLE_BOOL_EXT("ADC3 Capture Switch", IDT821034_ID_IN(3),
> > + idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
> > +};
> > +
> > +static int idt821034_power_event(struct snd_soc_dapm_widget *w,
> > + struct snd_kcontrol *kcontrol, int event)
> > +{
> > + struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
> > + unsigned int id = w->shift;
> > + u8 power, mask;
> > + int ret;
> > + u8 ch;
> > +
> > + ch = IDT821034_ID_GET_CHAN(id);
> > + mask = IDT821034_ID_IS_OUT(id) ? IDT821034_CONF_PWRUP_RX : IDT821034_CONF_PWRUP_TX;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + power = idt821034_get_channel_power(idt821034, ch);
> > + if (SND_SOC_DAPM_EVENT_ON(event))
> > + power |= mask;
> > + else
> > + power &= ~mask;
> > + ret = idt821034_set_channel_power(idt821034, ch, power);
> > +
> > + mutex_unlock(&idt821034->mutex);
> > +
> > + return ret;
> > +}
> > +
> > +static const struct snd_soc_dapm_widget idt821034_dapm_widgets[] = {
> > + SND_SOC_DAPM_DAC_E("DAC0", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(0), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > + SND_SOC_DAPM_DAC_E("DAC1", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(1), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > + SND_SOC_DAPM_DAC_E("DAC2", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(2), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > + SND_SOC_DAPM_DAC_E("DAC3", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(3), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > +
> > + SND_SOC_DAPM_OUTPUT("OUT0"),
> > + SND_SOC_DAPM_OUTPUT("OUT1"),
> > + SND_SOC_DAPM_OUTPUT("OUT2"),
> > + SND_SOC_DAPM_OUTPUT("OUT3"),
> > +
> > + SND_SOC_DAPM_DAC_E("ADC0", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(0), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > + SND_SOC_DAPM_DAC_E("ADC1", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(1), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > + SND_SOC_DAPM_DAC_E("ADC2", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(2), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > + SND_SOC_DAPM_DAC_E("ADC3", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(3), 0,
> > + idt821034_power_event,
> > + SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
> > +
> > + SND_SOC_DAPM_INPUT("IN0"),
> > + SND_SOC_DAPM_INPUT("IN1"),
> > + SND_SOC_DAPM_INPUT("IN2"),
> > + SND_SOC_DAPM_INPUT("IN3"),
> > +};
> > +
> > +static const struct snd_soc_dapm_route idt821034_dapm_routes[] = {
> > + { "OUT0", NULL, "DAC0" },
> > + { "OUT1", NULL, "DAC1" },
> > + { "OUT2", NULL, "DAC2" },
> > + { "OUT3", NULL, "DAC3" },
> > +
> > + { "ADC0", NULL, "IN0" },
> > + { "ADC1", NULL, "IN1" },
> > + { "ADC2", NULL, "IN2" },
> > + { "ADC3", NULL, "IN3" },
> > +};
> > +
> > +static int idt821034_dai_set_tdm_slot(struct snd_soc_dai *dai,
> > + unsigned int tx_mask, unsigned int rx_mask,
> > + int slots, int width)
> > +{
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
> > + unsigned int mask;
> > + u8 slot;
> > + int ret;
> > + u8 ch;
> > +
> > + switch (width) {
> > + case 0: /* Not set -> default 8 */
> > + case 8:
> > + break;
> > + default:
> > + dev_err(dai->dev, "tdm slot width %d not supported\n", width);
> > + return -EINVAL;
> > + }
> > +
> > + mask = tx_mask;
> > + slot = 0;
> > + ch = 0;
> > + while (mask && ch < IDT821034_NB_CHANNEL) {
> > + if (mask & 0x1) {
> > + mutex_lock(&idt821034->mutex);
> > + ret = idt821034_set_channel_ts(idt821034, ch, IDT821034_CH_RX, slot);
> > + mutex_unlock(&idt821034->mutex);
> > + if (ret) {
> > + dev_err(dai->dev, "ch%u set tx tdm slot failed (%d)\n",
> > + ch, ret);
> > + return ret;
> > + }
> > + ch++;
> > + }
> > + mask >>= 1;
> > + slot++;
> > + }
> > + if (mask) {
> > + dev_err(dai->dev, "too much tx slots defined (mask = 0x%x) support max %d\n",
> > + tx_mask, IDT821034_NB_CHANNEL);
> > + return -EINVAL;
> > + }
> > + idt821034->max_ch_playback = ch;
> > +
> > + mask = rx_mask;
> > + slot = 0;
> > + ch = 0;
> > + while (mask && ch < IDT821034_NB_CHANNEL) {
> > + if (mask & 0x1) {
> > + mutex_lock(&idt821034->mutex);
> > + ret = idt821034_set_channel_ts(idt821034, ch, IDT821034_CH_TX, slot);
> > + mutex_unlock(&idt821034->mutex);
> > + if (ret) {
> > + dev_err(dai->dev, "ch%u set rx tdm slot failed (%d)\n",
> > + ch, ret);
> > + return ret;
> > + }
> > + ch++;
> > + }
> > + mask >>= 1;
> > + slot++;
> > + }
> > + if (mask) {
> > + dev_err(dai->dev, "too much rx slots defined (mask = 0x%x) support max %d\n",
> > + rx_mask, IDT821034_NB_CHANNEL);
> > + return -EINVAL;
> > + }
> > + idt821034->max_ch_capture = ch;
> > +
> > + return 0;
> > +}
> > +
> > +static int idt821034_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
> > +{
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
> > + u8 conf;
> > + int ret;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + conf = idt821034_get_codec_conf(idt821034);
> > +
> > + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
> > + case SND_SOC_DAIFMT_DSP_A:
> > + conf |= IDT821034_CONF_DELAY_MODE;
> > + break;
> > + case SND_SOC_DAIFMT_DSP_B:
> > + conf &= ~IDT821034_CONF_DELAY_MODE;
> > + break;
> > + default:
> > + dev_err(dai->dev, "Unsupported DAI format 0x%x\n",
> > + fmt & SND_SOC_DAIFMT_FORMAT_MASK);
> > + ret = -EINVAL;
> > + goto end;
> > + }
> > + ret = idt821034_set_codec_conf(idt821034, conf);
> > +end:
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static int idt821034_dai_hw_params(struct snd_pcm_substream *substream,
> > + struct snd_pcm_hw_params *params,
> > + struct snd_soc_dai *dai)
> > +{
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
> > + u8 conf;
> > + int ret;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + conf = idt821034_get_codec_conf(idt821034);
> > +
> > + switch (params_format(params)) {
> > + case SNDRV_PCM_FORMAT_A_LAW:
> > + conf |= IDT821034_CONF_ALAW_MODE;
> > + break;
> > + case SNDRV_PCM_FORMAT_MU_LAW:
> > + conf &= ~IDT821034_CONF_ALAW_MODE;
> > + break;
> > + default:
> > + dev_err(dai->dev, "Unsupported PCM format 0x%x\n",
> > + params_format(params));
> > + ret = -EINVAL;
> > + goto end;
> > + }
> > + ret = idt821034_set_codec_conf(idt821034, conf);
> > +end:
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static const unsigned int idt821034_sample_bits[] = {8};
> > +
> > +static struct snd_pcm_hw_constraint_list idt821034_sample_bits_constr = {
> > + .list = idt821034_sample_bits,
> > + .count = ARRAY_SIZE(idt821034_sample_bits),
> > +};
> > +
> > +static int idt821034_dai_startup(struct snd_pcm_substream *substream,
> > + struct snd_soc_dai *dai)
> > +{
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
> > + unsigned int max_ch = 0;
> > + int ret;
> > +
> > + max_ch = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
> > + idt821034->max_ch_playback : idt821034->max_ch_capture;
> > +
> > + /*
> > + * Disable stream support (min = 0, max = 0) if no timeslots were
> > + * configured otherwise, limit the number of channels to those
> > + * configured.
> > + */
> > + ret = snd_pcm_hw_constraint_minmax(substream->runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
> > + max_ch ? 1 : 0, max_ch);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
> > + &idt821034_sample_bits_constr);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static u64 idt821034_dai_formats[] = {
> > + SND_SOC_POSSIBLE_DAIFMT_DSP_A |
> > + SND_SOC_POSSIBLE_DAIFMT_DSP_B,
> > +};
> > +
> > +static const struct snd_soc_dai_ops idt821034_dai_ops = {
> > + .startup = idt821034_dai_startup,
> > + .hw_params = idt821034_dai_hw_params,
> > + .set_tdm_slot = idt821034_dai_set_tdm_slot,
> > + .set_fmt = idt821034_dai_set_fmt,
> > + .auto_selectable_formats = idt821034_dai_formats,
> > + .num_auto_selectable_formats = ARRAY_SIZE(idt821034_dai_formats),
> > +};
> > +
> > +static struct snd_soc_dai_driver idt821034_dai_driver = {
> > + .name = "idt821034",
> > + .playback = {
> > + .stream_name = "Playback",
> > + .channels_min = 1,
> > + .channels_max = IDT821034_NB_CHANNEL,
> > + .rates = SNDRV_PCM_RATE_8000,
> > + .formats = SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW,
> > + },
> > + .capture = {
> > + .stream_name = "Capture",
> > + .channels_min = 1,
> > + .channels_max = IDT821034_NB_CHANNEL,
> > + .rates = SNDRV_PCM_RATE_8000,
> > + .formats = SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW,
> > + },
> > + .ops = &idt821034_dai_ops,
> > +};
> > +
> > +static int idt821034_reset_audio(struct idt821034 *idt821034)
> > +{
> > + int ret;
> > + u8 i;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + ret = idt821034_set_codec_conf(idt821034, 0);
> > + if (ret)
> > + goto end;
> > +
> > + for (i = 0; i < IDT821034_NB_CHANNEL; i++) {
> > + idt821034->amps.ch[i].amp_out.gain = IDT821034_GAIN_OUT_INIT_RAW;
> > + idt821034->amps.ch[i].amp_out.is_muted = false;
> > + ret = idt821034_set_gain_channel(idt821034, i, IDT821034_GAIN_RX,
> > + idt821034->amps.ch[i].amp_out.gain);
> > + if (ret)
> > + goto end;
> > +
> > + idt821034->amps.ch[i].amp_in.gain = IDT821034_GAIN_IN_INIT_RAW;
> > + idt821034->amps.ch[i].amp_in.is_muted = false;
> > + ret = idt821034_set_gain_channel(idt821034, i, IDT821034_GAIN_TX,
> > + idt821034->amps.ch[i].amp_in.gain);
> > + if (ret)
> > + goto end;
> > +
> > + ret = idt821034_set_channel_power(idt821034, i, 0);
> > + if (ret)
> > + goto end;
> > + }
> > +
> > + ret = 0;
> > +end:
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static int idt821034_component_probe(struct snd_soc_component *component)
> > +{
> > + struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
> > + int ret;
> > +
> > + /* reset idt821034 audio part*/
> > + ret = idt821034_reset_audio(idt821034);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct snd_soc_component_driver idt821034_component_driver = {
> > + .probe = idt821034_component_probe,
> > + .controls = idt821034_controls,
> > + .num_controls = ARRAY_SIZE(idt821034_controls),
> > + .dapm_widgets = idt821034_dapm_widgets,
> > + .num_dapm_widgets = ARRAY_SIZE(idt821034_dapm_widgets),
> > + .dapm_routes = idt821034_dapm_routes,
> > + .num_dapm_routes = ARRAY_SIZE(idt821034_dapm_routes),
> > + .endianness = 1,
> > +};
> > +
> > +#if IS_ENABLED(CONFIG_GPIOLIB)
>
> #ifdef CONFIG_GPIOLIB ?
>
> Is that #if section needed at all ? Isn't it possible to have it all the
> time and check IS_ENABLED(CONFIG_GPIOLIB) in the probe before calling
> the init ? Something like :
>
> if (IS_ENABLED(CONFIG_GPIOLIB))
> return idt821034_gpio_init(idt821034);
> return 0;

The following functions:
- idt821034_chip_gpio_set(),
- idt821034_chip_gpio_get(),
- idt821034_chip_get_direction(),
- idt821034_chip_direction_input(),
- idt821034_chip_direction_output()
use gpiochip_get_data() to retrieve private data.

gpiochip_get_data() is defined only when CONFIG_GPIOLIB is set.
That's why the #if section is used.

>
> > +#define IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(_offset) (((_offset) / 5) % 4)
> > +#define IDT821034_GPIO_OFFSET_TO_SLIC_MASK(_offset) BIT((_offset) % 5)
> > +
> > +static void idt821034_chip_gpio_set(struct gpio_chip *c, unsigned int offset, int val)
> > +{
> > + u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
> > + u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
> > + struct idt821034 *idt821034 = gpiochip_get_data(c);
> > + u8 slic_raw;
> > + int ret;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + slic_raw = idt821034_get_written_slic_raw(idt821034, ch);
> > + if (val)
> > + slic_raw |= mask;
> > + else
> > + slic_raw &= ~mask;
> > + ret = idt821034_write_slic_raw(idt821034, ch, slic_raw);
> > + if (ret) {
> > + dev_err(&idt821034->spi->dev, "set gpio %d (%u, 0x%x) failed (%d)\n",
> > + offset, ch, mask, ret);
> > + }
> > +
> > + mutex_unlock(&idt821034->mutex);
> > +}
> > +
> > +static int idt821034_chip_gpio_get(struct gpio_chip *c, unsigned int offset)
> > +{
> > + u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
> > + u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
> > + struct idt821034 *idt821034 = gpiochip_get_data(c);
> > + u8 slic_raw;
> > + int ret;
> > +
> > + mutex_lock(&idt821034->mutex);
> > + ret = idt821034_read_slic_raw(idt821034, ch, &slic_raw);
> > + mutex_unlock(&idt821034->mutex);
> > + if (ret) {
> > + dev_err(&idt821034->spi->dev, "get gpio %d (%u, 0x%x) failed (%d)\n",
> > + offset, ch, mask, ret);
> > + return ret;
> > + }
> > +
> > + /*
> > + * SLIC IOs are read in reverse order compared to write.
> > + * Reverse the read value here in order to have IO0 at lsb (ie same
> > + * order as write)
> > + */
> > + return !!(bitrev8(slic_raw) & mask);
> > +}
> > +
> > +static int idt821034_chip_get_direction(struct gpio_chip *c, unsigned int offset)
> > +{
> > + u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
> > + u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
> > + struct idt821034 *idt821034 = gpiochip_get_data(c);
> > + u8 slic_dir;
> > +
> > + mutex_lock(&idt821034->mutex);
> > + slic_dir = idt821034_get_slic_conf(idt821034, ch);
> > + mutex_unlock(&idt821034->mutex);
> > +
> > + return slic_dir & mask ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
> > +}
> > +
> > +static int idt821034_chip_direction_input(struct gpio_chip *c, unsigned int offset)
> > +{
> > + u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
> > + u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
> > + struct idt821034 *idt821034 = gpiochip_get_data(c);
> > + u8 slic_conf;
> > + int ret;
> > +
> > + /* Only IO0 and IO1 can be set as input */
> > + if (mask & ~(IDT821034_SLIC_IO1_IN | IDT821034_SLIC_IO0_IN))
> > + return -EPERM;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + slic_conf = idt821034_get_slic_conf(idt821034, ch) | mask;
> > +
> > + ret = idt821034_set_slic_conf(idt821034, ch, slic_conf);
> > + if (ret) {
> > + dev_err(&idt821034->spi->dev, "dir in gpio %d (%u, 0x%x) failed (%d)\n",
> > + offset, ch, mask, ret);
> > + }
> > +
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static int idt821034_chip_direction_output(struct gpio_chip *c, unsigned int offset, int val)
> > +{
> > + u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
> > + u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
> > + struct idt821034 *idt821034 = gpiochip_get_data(c);
> > + u8 slic_conf;
> > + int ret;
> > +
> > + idt821034_chip_gpio_set(c, offset, val);
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + slic_conf = idt821034_get_slic_conf(idt821034, ch) & ~mask;
> > +
> > + ret = idt821034_set_slic_conf(idt821034, ch, slic_conf);
> > + if (ret) {
> > + dev_err(&idt821034->spi->dev, "dir in gpio %d (%u, 0x%x) failed (%d)\n",
> > + offset, ch, mask, ret);
> > + }
> > +
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static int idt821034_reset_gpio(struct idt821034 *idt821034)
> > +{
> > + int ret;
> > + u8 i;
> > +
> > + mutex_lock(&idt821034->mutex);
> > +
> > + /* IO0 and IO1 as input for all channels and output IO set to 0 */
> > + for (i = 0; i < IDT821034_NB_CHANNEL; i++) {
> > + ret = idt821034_set_slic_conf(idt821034, i,
> > + IDT821034_SLIC_IO1_IN | IDT821034_SLIC_IO0_IN);
> > + if (ret)
> > + goto end;
> > +
> > + ret = idt821034_write_slic_raw(idt821034, i, 0);
> > + if (ret)
> > + goto end;
> > +
> > + }
> > + ret = 0;
> > +end:
> > + mutex_unlock(&idt821034->mutex);
> > + return ret;
> > +}
> > +
> > +static int idt821034_gpio_init(struct idt821034 *idt821034)
> > +{
> > + int ret;
> > +
> > + ret = idt821034_reset_gpio(idt821034);
> > + if (ret)
> > + return ret;
> > +
> > + idt821034->gpio_chip.owner = THIS_MODULE;
>
> Is the owner really needed ?

I think it is:
https://elixir.bootlin.com/linux/latest/source/include/linux/gpio/driver.h#L319

and look at drivers/gpio/, a lot of drivers (all ?) set the owner value.

>
> > + idt821034->gpio_chip.label = dev_name(&idt821034->spi->dev);
> > + idt821034->gpio_chip.parent = &idt821034->spi->dev;
> > + idt821034->gpio_chip.base = -1;
> > + idt821034->gpio_chip.ngpio = 5 * 4; /* 5 GPIOs on 4 channels */
> > + idt821034->gpio_chip.get_direction = idt821034_chip_get_direction;
> > + idt821034->gpio_chip.direction_input = idt821034_chip_direction_input;
> > + idt821034->gpio_chip.direction_output = idt821034_chip_direction_output;
> > + idt821034->gpio_chip.get = idt821034_chip_gpio_get;
> > + idt821034->gpio_chip.set = idt821034_chip_gpio_set;
> > + idt821034->gpio_chip.can_sleep = true;
> > +
> > + return devm_gpiochip_add_data(&idt821034->spi->dev, &idt821034->gpio_chip,
> > + idt821034);
> > +}
> > +#else /* IS_ENABLED(CONFIG_GPIOLIB) */
> > +static int idt821034_gpio_init(struct idt821034 *idt821034)
> > +{
> > + return 0;
> > +}
> > +#endif
> > +
> > +static int idt821034_spi_probe(struct spi_device *spi)
> > +{
> > + struct idt821034 *idt821034;
> > + int ret;
> > +
> > + spi->bits_per_word = 8;
> > + ret = spi_setup(spi);
> > + if (ret < 0)
> > + return ret;
> > +
> > + idt821034 = devm_kzalloc(&spi->dev, sizeof(*idt821034), GFP_KERNEL);
> > + if (!idt821034)
> > + return -ENOMEM;
> > +
> > + idt821034->spi = spi;
> > +
> > + mutex_init(&idt821034->mutex);
> > +
> > + spi_set_drvdata(spi, idt821034);
> > +
> > + ret = devm_snd_soc_register_component(&spi->dev, &idt821034_component_driver,
> > + &idt821034_dai_driver, 1);
> > + if (ret)
> > + return ret;
> > +
> > + ret = idt821034_gpio_init(idt821034);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id idt821034_of_match[] = {
> > + { .compatible = "renesas,idt821034", },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(of, idt821034_of_match);
> > +
> > +static const struct spi_device_id idt821034_id_table[] = {
> > + { "idt821034", 0 },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(spi, idt821034_id_table);
> > +
> > +static struct spi_driver idt821034_spi_driver = {
> > + .driver = {
> > + .name = "idt821034",
> > + .of_match_table = idt821034_of_match,
> > + },
> > + .id_table = idt821034_id_table,
> > + .probe = idt821034_spi_probe,
> > +};
> > +
> > +module_spi_driver(idt821034_spi_driver);
> > +
> > +MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
> > +MODULE_DESCRIPTION("IDT821034 ALSA SoC driver");
> > +MODULE_LICENSE("GPL");

Thanks for the review,

Hervé
--
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering