--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the NTP8918 Audio Amplifier
+ *
+ * Copyright (c) 2024, SaluteDevices. All Rights Reserved.
+ *
+ * Author: Igor Prusov <ivprusov@salutedevices.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#include <sound/initval.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-component.h>
+#include <sound/tlv.h>
+
+#include "ntpfw.h"
+
+#define NTP8918_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
+
+#define NTP8918_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+#define NTP8918_INPUT_FMT 0x0
+#define NTP8918_INPUT_FMT_MASTER_MODE BIT(0)
+#define NTP8918_INPUT_FMT_GSA_MODE BIT(1)
+#define NTP8918_GSA_FMT 0x1
+#define NTP8918_GSA_BS_MASK GENMASK(3, 2)
+#define NTP8918_GSA_BS(x) ((x) << 2)
+#define NTP8918_GSA_RIGHT_J BIT(0)
+#define NTP8918_GSA_LSB BIT(1)
+#define NTP8918_MCLK_FREQ_CTRL 0x2
+#define NTP8918_MCLK_FREQ_MCF GENMASK(1, 0)
+#define NTP8918_MASTER_VOL 0x0C
+#define NTP8918_CHNL_A_VOL 0x17
+#define NTP8918_CHNL_B_VOL 0x18
+#define NTP8918_SOFT_MUTE 0x33
+#define NTP8918_SOFT_MUTE_SM1 BIT(0)
+#define NTP8918_SOFT_MUTE_SM2 BIT(1)
+#define NTP8918_PWM_SWITCH 0x34
+#define NTP8918_PWM_MASK_CTRL0 0x35
+#define REG_MAX NTP8918_PWM_MASK_CTRL0
+
+#define NTP8918_FW_NAME "eq_8918.bin"
+#define NTP8918_FW_MAGIC 0x38393138 /* "8918" */
+
+struct ntp8918_priv {
+ struct i2c_client *i2c;
+ struct clk *bck;
+ struct reset_control *reset;
+ unsigned int format;
+};
+
+static const DECLARE_TLV_DB_SCALE(ntp8918_master_vol_scale, -12550, 50, 0);
+
+static const struct snd_kcontrol_new ntp8918_vol_control[] = {
+ SOC_SINGLE_RANGE_TLV("Playback Volume", NTP8918_MASTER_VOL, 0,
+ 0x04, 0xff, 0, ntp8918_master_vol_scale),
+ SOC_SINGLE("Playback Switch", NTP8918_PWM_MASK_CTRL0, 1, 1, 1),
+};
+
+static void ntp8918_reset_gpio(struct ntp8918_priv *ntp8918)
+{
+ /*
+ * Proper initialization sequence for NTP8918 amplifier requires driving
+ * /RESET signal low during power up for at least 0.1us. The sequence is,
+ * according to NTP8918 datasheet, 6.2 Timing Sequence 1:
+ * Deassert for T2 >= 1ms...
+ */
+ reset_control_deassert(ntp8918->reset);
+ fsleep(1000);
+
+ /* ...Assert for T3 >= 0.1us... */
+ reset_control_assert(ntp8918->reset);
+ fsleep(1);
+
+ /* ...Deassert, and wait for T4 >= 0.5ms before sound on sequence. */
+ reset_control_deassert(ntp8918->reset);
+ fsleep(500);
+}
+
+static const struct reg_sequence ntp8918_sound_off[] = {
+ { NTP8918_MASTER_VOL, 0 },
+};
+
+static const struct reg_sequence ntp8918_sound_on[] = {
+ { NTP8918_MASTER_VOL, 0b11 },
+};
+
+static int ntp8918_load_firmware(struct ntp8918_priv *ntp8918)
+{
+ int ret;
+
+ ret = ntpfw_load(ntp8918->i2c, NTP8918_FW_NAME, NTP8918_FW_MAGIC);
+ if (ret == -ENOENT) {
+ dev_warn_once(&ntp8918->i2c->dev, "Could not find firmware %s\n",
+ NTP8918_FW_NAME);
+ return 0;
+ }
+
+ return ret;
+}
+
+static int ntp8918_snd_suspend(struct snd_soc_component *component)
+{
+ struct ntp8918_priv *ntp8918 = snd_soc_component_get_drvdata(component);
+
+ regcache_cache_only(component->regmap, true);
+
+ regmap_multi_reg_write_bypassed(component->regmap,
+ ntp8918_sound_off,
+ ARRAY_SIZE(ntp8918_sound_off));
+
+ /*
+ * According to NTP8918 datasheet, 6.2 Timing Sequence 1:
+ * wait after sound off for T6 >= 0.5ms
+ */
+ fsleep(500);
+ reset_control_assert(ntp8918->reset);
+
+ regcache_mark_dirty(component->regmap);
+ clk_disable_unprepare(ntp8918->bck);
+
+ return 0;
+}
+
+static int ntp8918_snd_resume(struct snd_soc_component *component)
+{
+ struct ntp8918_priv *ntp8918 = snd_soc_component_get_drvdata(component);
+ int ret;
+
+ ret = clk_prepare_enable(ntp8918->bck);
+ if (ret)
+ return ret;
+
+ ntp8918_reset_gpio(ntp8918);
+
+ regmap_multi_reg_write_bypassed(component->regmap,
+ ntp8918_sound_on,
+ ARRAY_SIZE(ntp8918_sound_on));
+
+ ret = ntp8918_load_firmware(ntp8918);
+ if (ret) {
+ dev_err(&ntp8918->i2c->dev, "Failed to load firmware\n");
+ return ret;
+ }
+
+ regcache_cache_only(component->regmap, false);
+ snd_soc_component_cache_sync(component);
+
+ return 0;
+}
+
+static int ntp8918_probe(struct snd_soc_component *component)
+{
+ int ret;
+ struct ntp8918_priv *ntp8918 = snd_soc_component_get_drvdata(component);
+ struct device *dev = component->dev;
+
+ ret = snd_soc_add_component_controls(component, ntp8918_vol_control,
+ ARRAY_SIZE(ntp8918_vol_control));
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to add controls\n");
+
+ ret = ntp8918_load_firmware(ntp8918);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to load firmware\n");
+
+ return 0;
+}
+
+static const struct snd_soc_dapm_widget ntp8918_dapm_widgets[] = {
+ SND_SOC_DAPM_DAC("AIFIN", "Playback", SND_SOC_NOPM, 0, 0),
+
+ SND_SOC_DAPM_OUTPUT("OUT1"),
+ SND_SOC_DAPM_OUTPUT("OUT2"),
+};
+
+static const struct snd_soc_dapm_route ntp8918_dapm_routes[] = {
+ { "OUT1", NULL, "AIFIN" },
+ { "OUT2", NULL, "AIFIN" },
+};
+
+static const struct snd_soc_component_driver soc_component_ntp8918 = {
+ .probe = ntp8918_probe,
+ .suspend = ntp8918_snd_suspend,
+ .resume = ntp8918_snd_resume,
+ .dapm_widgets = ntp8918_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(ntp8918_dapm_widgets),
+ .dapm_routes = ntp8918_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(ntp8918_dapm_routes),
+};
+
+static int ntp8918_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ struct ntp8918_priv *ntp8918 = snd_soc_component_get_drvdata(component);
+ unsigned int input_fmt = 0;
+ unsigned int gsa_fmt = 0;
+ unsigned int gsa_fmt_mask;
+ unsigned int mcf;
+ int bclk;
+ int ret;
+
+ bclk = snd_soc_params_to_bclk(params);
+ switch (bclk) {
+ case 3072000:
+ case 2822400:
+ mcf = 0;
+ break;
+ case 6144000:
+ mcf = 1;
+ break;
+ case 2048000:
+ mcf = 2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = snd_soc_component_update_bits(component, NTP8918_MCLK_FREQ_CTRL,
+ NTP8918_MCLK_FREQ_MCF, mcf);
+ if (ret)
+ return ret;
+
+ switch (ntp8918->format) {
+ case SND_SOC_DAIFMT_I2S:
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ input_fmt |= NTP8918_INPUT_FMT_GSA_MODE;
+ gsa_fmt |= NTP8918_GSA_RIGHT_J;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ input_fmt |= NTP8918_INPUT_FMT_GSA_MODE;
+ break;
+ }
+
+ ret = snd_soc_component_update_bits(component, NTP8918_INPUT_FMT,
+ NTP8918_INPUT_FMT_MASTER_MODE |
+ NTP8918_INPUT_FMT_GSA_MODE,
+ input_fmt);
+
+ if (!(input_fmt & NTP8918_INPUT_FMT_GSA_MODE) || ret < 0)
+ return ret;
+
+ switch (params_width(params)) {
+ case 24:
+ gsa_fmt |= NTP8918_GSA_BS(0);
+ break;
+ case 20:
+ gsa_fmt |= NTP8918_GSA_BS(1);
+ break;
+ case 18:
+ gsa_fmt |= NTP8918_GSA_BS(2);
+ break;
+ case 16:
+ gsa_fmt |= NTP8918_GSA_BS(3);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ gsa_fmt_mask = NTP8918_GSA_BS_MASK |
+ NTP8918_GSA_RIGHT_J |
+ NTP8918_GSA_LSB;
+ return snd_soc_component_update_bits(component, NTP8918_GSA_FMT,
+ gsa_fmt_mask, gsa_fmt);
+}
+
+static int ntp8918_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct snd_soc_component *component = dai->component;
+ struct ntp8918_priv *ntp8918 = snd_soc_component_get_drvdata(component);
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ case SND_SOC_DAIFMT_RIGHT_J:
+ case SND_SOC_DAIFMT_LEFT_J:
+ ntp8918->format = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int ntp8918_digital_mute(struct snd_soc_dai *dai, int mute, int stream)
+{
+ unsigned int mute_mask = NTP8918_SOFT_MUTE_SM1 |
+ NTP8918_SOFT_MUTE_SM2;
+
+ return snd_soc_component_update_bits(dai->component, NTP8918_SOFT_MUTE,
+ mute_mask, mute ? mute_mask : 0);
+}
+
+static const struct snd_soc_dai_ops ntp8918_dai_ops = {
+ .hw_params = ntp8918_hw_params,
+ .set_fmt = ntp8918_set_fmt,
+ .mute_stream = ntp8918_digital_mute,
+};
+
+static struct snd_soc_dai_driver ntp8918_dai = {
+ .name = "ntp8918-amplifier",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = NTP8918_RATES,
+ .formats = NTP8918_FORMATS,
+ },
+ .ops = &ntp8918_dai_ops,
+};
+
+static const struct regmap_config ntp8918_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = REG_MAX,
+ .cache_type = REGCACHE_MAPLE,
+};
+
+static int ntp8918_i2c_probe(struct i2c_client *i2c)
+{
+ struct ntp8918_priv *ntp8918;
+ int ret;
+ struct regmap *regmap;
+
+ ntp8918 = devm_kzalloc(&i2c->dev, sizeof(*ntp8918), GFP_KERNEL);
+ if (!ntp8918)
+ return -ENOMEM;
+
+ ntp8918->i2c = i2c;
+
+ ntp8918->reset = devm_reset_control_get_shared(&i2c->dev, NULL);
+ if (IS_ERR(ntp8918->reset))
+ return dev_err_probe(&i2c->dev, PTR_ERR(ntp8918->reset), "Failed to get reset\n");
+
+ dev_set_drvdata(&i2c->dev, ntp8918);
+
+ ntp8918_reset_gpio(ntp8918);
+
+ regmap = devm_regmap_init_i2c(i2c, &ntp8918_regmap);
+ if (IS_ERR(regmap))
+ return dev_err_probe(&i2c->dev, PTR_ERR(regmap),
+ "Failed to allocate regmap\n");
+
+ ret = devm_snd_soc_register_component(&i2c->dev, &soc_component_ntp8918,
+ &ntp8918_dai, 1);
+ if (ret)
+ return dev_err_probe(&i2c->dev, ret,
+ "Failed to register component\n");
+
+ ntp8918->bck = devm_clk_get_enabled(&i2c->dev, "bck");
+ if (IS_ERR(ntp8918->bck))
+ return dev_err_probe(&i2c->dev, PTR_ERR(ntp8918->bck), "failed to get bck clock\n");
+
+ return 0;
+}
+
+static const struct i2c_device_id ntp8918_i2c_id[] = {
+ { "ntp8918", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, ntp8918_i2c_id);
+
+static const struct of_device_id ntp8918_of_match[] = {
+ {.compatible = "neofidelity,ntp8918"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, ntp8918_of_match);
+
+static struct i2c_driver ntp8918_i2c_driver = {
+ .probe = ntp8918_i2c_probe,
+ .id_table = ntp8918_i2c_id,
+ .driver = {
+ .name = "ntp8918",
+ .of_match_table = ntp8918_of_match,
+ },
+};
+module_i2c_driver(ntp8918_i2c_driver);
+
+MODULE_AUTHOR("Igor Prusov <ivprusov@salutedevices.com>");
+MODULE_DESCRIPTION("NTP8918 Audio Amplifier Driver");
+MODULE_LICENSE("GPL");
projects / thirdparty / linux.git / commitdiff
