[PATCH v4 5/9] media: adv748x: add support for HDMI audio

Alex Riesen
2020-03-26T11:07:23Z

This adds an implemention of SoC DAI driver which provides access to the
I2S port of the device.

Signed-off-by: Alexander Riesen <alexander.riesen@cetitec.com>
--

v3: fix clock registration in case of multiple adv748x devices
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>

v4: use clk_hw instead of clk
Suggested-by: Stephen Boyd <sboyd@kernel.org>

v4: use const for capture snd_soc_pcm_stream instance
Suggested-by: Stephen Boyd <sboyd@kernel.org>
---
drivers/media/i2c/adv748x/Makefile | 3 +-
drivers/media/i2c/adv748x/adv748x-core.c | 9 +-
drivers/media/i2c/adv748x/adv748x-dai.c | 261 +++++++++++++++++++++++
drivers/media/i2c/adv748x/adv748x.h | 17 +-
4 files changed, 287 insertions(+), 3 deletions(-)
create mode 100644 drivers/media/i2c/adv748x/adv748x-dai.c

diff --git a/drivers/media/i2c/adv748x/Makefile b/drivers/media/i2c/adv748x/Makefile
index 93844f14cb10..6e7a302ef199 100644
--- a/drivers/media/i2c/adv748x/Makefile
+++ b/drivers/media/i2c/adv748x/Makefile
@@ -3,6 +3,7 @@ adv748x-objs := \
adv748x-afe.o \
adv748x-core.o \
adv748x-csi2.o \
- adv748x-hdmi.o
+ adv748x-hdmi.o \
+ adv748x-dai.o

obj-$(CONFIG_VIDEO_ADV748X) += adv748x.o
diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c
index 8580e6624276..3513ca138e53 100644
--- a/drivers/media/i2c/adv748x/adv748x-core.c
+++ b/drivers/media/i2c/adv748x/adv748x-core.c
@@ -765,8 +765,14 @@ static int adv748x_probe(struct i2c_client *client)
goto err_cleanup_txa;
}

+ ret = adv748x_dai_init(&state->dai);
+ if (ret) {
+ adv_err(state, "Failed to probe DAI\n");
+ goto err_cleanup_txb;
+ }
return 0;
-
+err_cleanup_txb:
+ adv748x_csi2_cleanup(&state->txb);
err_cleanup_txa:
adv748x_csi2_cleanup(&state->txa);
err_cleanup_afe:
@@ -787,6 +793,7 @@ static int adv748x_remove(struct i2c_client *client)
{
struct adv748x_state *state = i2c_get_clientdata(client);

+ adv748x_dai_cleanup(&state->dai);
adv748x_afe_cleanup(&state->afe);
adv748x_hdmi_cleanup(&state->hdmi);

diff --git a/drivers/media/i2c/adv748x/adv748x-dai.c b/drivers/media/i2c/adv748x/adv748x-dai.c
new file mode 100644
index 000000000000..c9191f8f1ca8
--- /dev/null
+++ b/drivers/media/i2c/adv748x/adv748x-dai.c
@@ -0,0 +1,261 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Analog Devices ADV748X HDMI receiver with AFE
+ * The implementation of DAI.
+ */
+
+#include "adv748x.h"
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <sound/pcm_params.h>
+
+#define state_of(soc_dai) \
+ adv748x_dai_to_state(container_of((soc_dai)->driver, \
+ struct adv748x_dai, drv))
+#define mclk_of(state) ((state)->dai.mclk_hw->clk)
+
+static const char ADV748X_DAI_NAME[] = "adv748x-i2s";
+
+static int set_audio_pads_state(struct adv748x_state *state, int on)
+{
+ return io_clrset(state, ADV748X_IO_PAD_CONTROLS,
+ ADV748X_IO_PAD_CONTROLS_TRI_AUD |
+ ADV748X_IO_PAD_CONTROLS_PDN_AUD,
+ on ? 0 : 0xff);
+}
+
+static int set_dpll_mclk_fs(struct adv748x_state *state, int fs)
+{
+ return dpll_clrset(state, ADV748X_DPLL_MCLK_FS,
+ ADV748X_DPLL_MCLK_FS_N_MASK, (fs / 128) - 1);
+}
+
+static int set_i2s_format(struct adv748x_state *state, uint outmode,
+ uint bitwidth)
+{
+ return hdmi_clrset(state, ADV748X_HDMI_I2S,
+ ADV748X_HDMI_I2SBITWIDTH_MASK |
+ ADV748X_HDMI_I2SOUTMODE_MASK,
+ (outmode << ADV748X_HDMI_I2SOUTMODE_SHIFT) |
+ bitwidth);
+}
+
+static int set_i2s_tdm_mode(struct adv748x_state *state, int is_tdm)
+{
+ int ret;
+
+ ret = hdmi_clrset(state, ADV748X_HDMI_AUDIO_MUTE_SPEED,
+ ADV748X_MAN_AUDIO_DL_BYPASS |
+ ADV748X_AUDIO_DELAY_LINE_BYPASS,
+ is_tdm ? 0xff : 0);
+ if (ret < 0)
+ return ret;
+ ret = hdmi_clrset(state, ADV748X_HDMI_REG_6D,
+ ADV748X_I2S_TDM_MODE_ENABLE,
+ is_tdm ? 0xff : 0);
+ return ret;
+}
+
+static int set_audio_mute(struct adv748x_state *state, int enable)
+{
+ return hdmi_clrset(state, ADV748X_HDMI_MUTE_CTRL,
+ ADV748X_HDMI_MUTE_CTRL_MUTE_AUDIO,
+ enable ? 0xff : 0);
+}
+
+static int adv748x_dai_set_sysclk(struct snd_soc_dai *dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct adv748x_state *state = state_of(dai);
+
+ /* currently supporting only one fixed rate clock */
+ if (clk_id != 0 || freq != clk_get_rate(mclk_of(state))) {
+ dev_err(dai->dev, "invalid clock (%d) or frequency (%u, dir %d)\n",
+ clk_id, freq, dir);
+ return -EINVAL;
+ }
+ state->dai.freq = freq;
+ return 0;
+}
+
+static int adv748x_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct adv748x_state *state = state_of(dai);
+ int ret = 0;
+
+ if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBM_CFM) {
+ dev_err(dai->dev, "only I2S master clock mode supported\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAI_FORMAT_I2S:
+ state->dai.tdm = 0;
+ state->dai.fmt = ADV748X_I2SOUTMODE_I2S;
+ break;
+ case SND_SOC_DAI_FORMAT_RIGHT_J:
+ state->dai.tdm = 1;
+ state->dai.fmt = ADV748X_I2SOUTMODE_RIGHT_J;
+ break;
+ case SND_SOC_DAI_FORMAT_LEFT_J:
+ state->dai.tdm = 1;
+ state->dai.fmt = ADV748X_I2SOUTMODE_LEFT_J;
+ break;
+ default:
+ dev_err(dai->dev, "only i2s, left_j and right_j supported\n");
+ ret = -EINVAL;
+ goto done;
+ }
+ if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF) {
+ dev_err(dai->dev, "only normal bit clock + frame supported\n");
+ ret = -EINVAL;
+ }
+done:
+ return ret;
+}
+
+static int adv748x_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
+{
+ struct adv748x_state *state = state_of(dai);
+
+ if (sub->stream != SNDRV_PCM_STREAM_CAPTURE)
+ return -EINVAL;
+ return set_audio_pads_state(state, 1);
+}
+
+static int adv748x_dai_hw_params(struct snd_pcm_substream *sub,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ int ret;
+ struct adv748x_state *state = state_of(dai);
+ uint fs = state->dai.freq / params_rate(params);
+
+ dev_dbg(dai->dev, "dai %s substream %s rate=%u (fs=%u), channels=%u sample width=%u(%u)\n",
+ dai->name, sub->name,
+ params_rate(params), fs,
+ params_channels(params),
+ params_width(params),
+ params_physical_width(params));
+ switch (fs) {
+ case 128:
+ case 256:
+ case 384:
+ case 512:
+ case 640:
+ case 768:
+ break;
+ default:
+ ret = -EINVAL;
+ dev_err(dai->dev, "invalid clock frequency (%u) or rate (%u)\n",
+ state->dai.freq, params_rate(params));
+ goto done;
+ }
+ ret = set_dpll_mclk_fs(state, fs);
+ if (ret)
+ goto done;
+ ret = set_i2s_tdm_mode(state, state->dai.tdm);
+ if (ret)
+ goto done;
+ ret = set_i2s_format(state, state->dai.fmt, params_width(params));
+done:
+ return ret;
+}
+
+static int adv748x_dai_mute_stream(struct snd_soc_dai *dai, int mute, int dir)
+{
+ struct adv748x_state *state = state_of(dai);
+
+ return set_audio_mute(state, mute);
+}
+
+static void adv748x_dai_shutdown(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
+{
+ struct adv748x_state *state = state_of(dai);
+
+ set_audio_pads_state(state, 0);
+}
+
+static const struct snd_soc_dai_ops adv748x_dai_ops = {
+ .set_sysclk = adv748x_dai_set_sysclk,
+ .set_fmt = adv748x_dai_set_fmt,
+ .startup = adv748x_dai_startup,
+ .hw_params = adv748x_dai_hw_params,
+ .mute_stream = adv748x_dai_mute_stream,
+ .shutdown = adv748x_dai_shutdown,
+};
+
+static int adv748x_of_xlate_dai_name(struct snd_soc_component *component,
+ struct of_phandle_args *args,
+ const char **dai_name)
+{
+ if (dai_name)
+ *dai_name = ADV748X_DAI_NAME;
+ return 0;
+}
+
+static const struct snd_soc_component_driver adv748x_codec = {
+ .of_xlate_dai_name = adv748x_of_xlate_dai_name,
+};
+
+int adv748x_dai_init(struct adv748x_dai *dai)
+{
+ int ret;
+ struct adv748x_state *state = adv748x_dai_to_state(dai);
+
+ dai->mclk_name = kasprintf(GFP_KERNEL, "%s.%s-i2s-mclk",
+ state->dev->driver->name,
+ dev_name(state->dev));
+ if (!dai->mclk_name) {
+ ret = -ENOMEM;
+ adv_err(state, "No memory for MCLK\n");
+ goto fail;
+ }
+ dai->mclk_hw = clk_hw_register_fixed_rate(state->dev, dai->mclk_name,
+ NULL, 0, 12288000);
+ if (IS_ERR(dai->mclk_hw)) {
+ ret = PTR_ERR(dai->mclk_hw);
+ adv_err(state, "Failed to register MCLK (%d)\n", ret);
+ goto fail;
+ }
+ ret = of_clk_add_hw_provider(state->dev->of_node, of_clk_hw_simple_get,
+ dai->mclk_hw->clk);
+ if (ret < 0) {
+ adv_err(state, "Failed to add MCLK provider (%d)\n", ret);
+ goto unreg_mclk;
+ }
+ dai->drv.name = ADV748X_DAI_NAME;
+ dai->drv.ops = &adv748x_dai_ops;
+ dai->drv.capture = (const struct snd_soc_pcm_stream){
+ .stream_name = "Capture",
+ .channels_min = 8,
+ .channels_max = 8,
+ .rates = SNDRV_PCM_RATE_48000,
+ .formats = SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_U24_LE,
+ };
+
+ ret = devm_snd_soc_register_component(state->dev, &adv748x_codec,
+ &dai->drv, 1);
+ if (ret < 0) {
+ adv_err(state, "Failed to register the codec (%d)\n", ret);
+ goto cleanup_mclk;
+ }
+ return 0;
+
+cleanup_mclk:
+ of_clk_del_provider(state->dev->of_node);
+unreg_mclk:
+ clk_hw_unregister_fixed_rate(dai->mclk_hw);
+fail:
+ return ret;
+}
+
+void adv748x_dai_cleanup(struct adv748x_dai *dai)
+{
+ struct adv748x_state *state = adv748x_dai_to_state(dai);
+
+ of_clk_del_provider(state->dev->of_node);
+ clk_hw_unregister_fixed_rate(dai->mclk_hw);
+ kfree(dai->mclk_name);
+}
diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
index 1a1ea70086c6..454f97ff7b54 100644
--- a/drivers/media/i2c/adv748x/adv748x.h
+++ b/drivers/media/i2c/adv748x/adv748x.h
@@ -19,6 +19,7 @@
*/

#include <linux/i2c.h>
+#include <sound/soc.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>

@@ -63,7 +64,8 @@ enum adv748x_ports {
ADV748X_PORT_TTL = 9,
ADV748X_PORT_TXA = 10,
ADV748X_PORT_TXB = 11,
- ADV748X_PORT_MAX = 12,
+ ADV748X_PORT_I2S = 12,
+ ADV748X_PORT_MAX = 13,
};

enum adv748x_csi2_pads {
@@ -166,6 +168,13 @@ struct adv748x_afe {
container_of(ctrl->handler, struct adv748x_afe, ctrl_hdl)
#define adv748x_sd_to_afe(sd) container_of(sd, struct adv748x_afe, sd)

+struct adv748x_dai {
+ struct snd_soc_dai_driver drv;
+ struct clk_hw *mclk_hw;
+ char *mclk_name;
+ unsigned int freq, fmt, tdm;
+};
+
/**
* struct adv748x_state - State of ADV748X
* @dev: (OF) device
@@ -182,6 +191,7 @@ struct adv748x_afe {
* @afe: state of AFE receiver context
* @txa: state of TXA transmitter context
* @txb: state of TXB transmitter context
+ * @mclk: MCLK clock of the I2S port
*/
struct adv748x_state {
struct device *dev;
@@ -197,10 +207,12 @@ struct adv748x_state {
struct adv748x_afe afe;
struct adv748x_csi2 txa;
struct adv748x_csi2 txb;
+ struct adv748x_dai dai;
};

#define adv748x_hdmi_to_state(h) container_of(h, struct adv748x_state, hdmi)
#define adv748x_afe_to_state(a) container_of(a, struct adv748x_state, afe)
+#define adv748x_dai_to_state(p) container_of(p, struct adv748x_state, dai)

#define adv_err(a, fmt, arg...) dev_err(a->dev, fmt, ##arg)
#define adv_info(a, fmt, arg...) dev_info(a->dev, fmt, ##arg)
@@ -484,4 +496,7 @@ int adv748x_csi2_set_pixelrate(struct v4l2_subdev *sd, s64 rate);
int adv748x_hdmi_init(struct adv748x_hdmi *hdmi);
void adv748x_hdmi_cleanup(struct adv748x_hdmi *hdmi);

+int adv748x_dai_init(struct adv748x_dai *);
+void adv748x_dai_cleanup(struct adv748x_dai *);
+
#endif /* _ADV748X_H_ */
--
2.25.1.25.g9ecbe7eb18