Re: [PATCH v2 26/28] ASoC: codecs: Add support for the framer codec

[Andrew Lunn <andrew@xxxxxxx>]

On Wed, Jul 26, 2023 at 05:02:22PM +0200, Herve Codina wrote:
> The framer codec interracts with a framer.
> It allows to use some of the framer timeslots as audio channels to
> transport audio data over the framer E1/T1/J1 lines.
> It also reports line carrier detection events through the ALSA jack
> detection feature.
> 
> Signed-off-by: Herve Codina <herve.codina@xxxxxxxxxxx>
> ---
>  sound/soc/codecs/Kconfig        |  15 ++
>  sound/soc/codecs/Makefile       |   2 +
>  sound/soc/codecs/framer-codec.c | 423 ++++++++++++++++++++++++++++++++
>  3 files changed, 440 insertions(+)
>  create mode 100644 sound/soc/codecs/framer-codec.c
> 
> diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
> index f99203ef9b03..a86cdac39b72 100644
> --- a/sound/soc/codecs/Kconfig
> +++ b/sound/soc/codecs/Kconfig
> @@ -110,6 +110,7 @@ config SND_SOC_ALL_CODECS
>  	imply SND_SOC_ES8328_I2C
>  	imply SND_SOC_ES7134
>  	imply SND_SOC_ES7241
> +	imply SND_SOC_FRAMER
>  	imply SND_SOC_GTM601
>  	imply SND_SOC_HDAC_HDMI
>  	imply SND_SOC_HDAC_HDA
> @@ -1043,6 +1044,20 @@ config SND_SOC_ES8328_SPI
>  	depends on SPI_MASTER
>  	select SND_SOC_ES8328
>  
> +config SND_SOC_FRAMER
> +	tristate "Framer codec"
> +	depends on GENERIC_FRAMER
> +	help
> +	  Enable support for the framer codec.
> +	  The framer codec uses the generic framer infrastructure to transport
> +	  some audio data over an analog E1/T1/J1 line.
> +	  This codec allows to use some of the time slots available on the TDM
> +	  bus on which the framer is connected to transport the audio data.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called snd-soc-framer.
> +
> +
>  config SND_SOC_GTM601
>  	tristate 'GTM601 UMTS modem audio codec'
>  
> diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
> index 32dcc6de58bd..54667274a0f6 100644
> --- a/sound/soc/codecs/Makefile
> +++ b/sound/soc/codecs/Makefile
> @@ -116,6 +116,7 @@ snd-soc-es8326-objs := es8326.o
>  snd-soc-es8328-objs := es8328.o
>  snd-soc-es8328-i2c-objs := es8328-i2c.o
>  snd-soc-es8328-spi-objs := es8328-spi.o
> +snd-soc-framer-objs := framer-codec.o
>  snd-soc-gtm601-objs := gtm601.o
>  snd-soc-hdac-hdmi-objs := hdac_hdmi.o
>  snd-soc-hdac-hda-objs := hdac_hda.o
> @@ -499,6 +500,7 @@ obj-$(CONFIG_SND_SOC_ES8326)    += snd-soc-es8326.o
>  obj-$(CONFIG_SND_SOC_ES8328)	+= snd-soc-es8328.o
>  obj-$(CONFIG_SND_SOC_ES8328_I2C)+= snd-soc-es8328-i2c.o
>  obj-$(CONFIG_SND_SOC_ES8328_SPI)+= snd-soc-es8328-spi.o
> +obj-$(CONFIG_SND_SOC_FRAMER)	+= snd-soc-framer.o
>  obj-$(CONFIG_SND_SOC_GTM601)    += snd-soc-gtm601.o
>  obj-$(CONFIG_SND_SOC_HDAC_HDMI) += snd-soc-hdac-hdmi.o
>  obj-$(CONFIG_SND_SOC_HDAC_HDA) += snd-soc-hdac-hda.o
> diff --git a/sound/soc/codecs/framer-codec.c b/sound/soc/codecs/framer-codec.c
> new file mode 100644
> index 000000000000..52b4546a61ee
> --- /dev/null
> +++ b/sound/soc/codecs/framer-codec.c
> @@ -0,0 +1,423 @@
> +// SPDX-License-Identifier: GPL-2.0
> +//
> +// Framer ALSA SoC driver
> +//
> +// Copyright 2023 CS GROUP France
> +//
> +// Author: Herve Codina <herve.codina@xxxxxxxxxxx>
> +
> +#include <linux/clk.h>
> +#include <linux/framer/framer.h>
> +#include <linux/module.h>
> +#include <linux/notifier.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <sound/jack.h>
> +#include <sound/pcm_params.h>
> +#include <sound/soc.h>
> +#include <sound/tlv.h>
> +
> +#define FRAMER_NB_CHANNEL	32
> +#define FRAMER_JACK_MASK (SND_JACK_LINEIN | SND_JACK_LINEOUT)
> +
> +struct framer_codec {
> +	struct framer *framer;
> +	struct device *dev;
> +	struct snd_soc_jack jack;
> +	struct notifier_block nb;
> +	struct work_struct carrier_work;
> +	int max_chan_playback;
> +	int max_chan_capture;
> +};
> +
> +static int framer_dai_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
> +				   unsigned int rx_mask, int slots, int width)
> +{
> +	struct framer_codec *framer = snd_soc_component_get_drvdata(dai->component);
> +
> +	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;
> +	}
> +
> +	framer->max_chan_playback = hweight32(tx_mask);
> +	if (framer->max_chan_playback > FRAMER_NB_CHANNEL) {
> +		dev_err(dai->dev, "too much tx slots defined (mask = 0x%x) support max %d\n",

"many", not "much".

Also, "supported".

      Andrew