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@bootlin.com>
---
 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@bootlin.com>
+
+#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",