[PATCH v2 1/2] ASoC: add support for TAS5805M digital amplifier

From: Daniel Beer
Date: Thu Jan 13 2022 - 03:41:27 EST

The Texas Instruments TAS5805M is a class D audio amplifier with an
integrated DSP. DSP configuration is expected to be supplied via a
device-tree attribute containing a sequence of register writes.

These register writes set up application-specific DSP settings and are
expected to be generated using TI's PPC3 tool.

Signed-off-by: Daniel Beer <daniel.beer@xxxxxxxxxxxxxxxxx>
---
sound/soc/codecs/Kconfig | 9 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/tas5805m.c | 554 ++++++++++++++++++++++++++++++++++++
3 files changed, 565 insertions(+)
create mode 100644 sound/soc/codecs/tas5805m.c

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index d3e5ae8310ef..d6b8f5cb6ef8 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -1485,6 +1485,15 @@ config SND_SOC_TAS5720
Enable support for Texas Instruments TAS5720L/M high-efficiency mono
Class-D audio power amplifiers.

+config SND_SOC_TAS5805M
+ tristate "Texas Instruments TAS5805M speaker amplifier"
+ depends on I2C
+ help
+ Enable support for Texas Instruments TAS5805M Class-D
+ amplifiers. This is a speaker amplifier with an integrated
+ DSP. DSP configuration for each instance needs to be supplied
+ via a device-tree attribute.
+
config SND_SOC_TAS6424
tristate "Texas Instruments TAS6424 Quad-Channel Audio amplifier"
depends on I2C
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index ac7f20972470..b4e11c3e4a08 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -236,6 +236,7 @@ snd-soc-sti-sas-objs := sti-sas.o
snd-soc-tas5086-objs := tas5086.o
snd-soc-tas571x-objs := tas571x.o
snd-soc-tas5720-objs := tas5720.o
+snd-soc-tas5805m-objs := tas5805m.o
snd-soc-tas6424-objs := tas6424.o
snd-soc-tda7419-objs := tda7419.o
snd-soc-tas2770-objs := tas2770.o
@@ -574,6 +575,7 @@ obj-$(CONFIG_SND_SOC_TAS2764) += snd-soc-tas2764.o
obj-$(CONFIG_SND_SOC_TAS5086) += snd-soc-tas5086.o
obj-$(CONFIG_SND_SOC_TAS571X) += snd-soc-tas571x.o
obj-$(CONFIG_SND_SOC_TAS5720) += snd-soc-tas5720.o
+obj-$(CONFIG_SND_SOC_TAS5805M) += snd-soc-tas5805m.o
obj-$(CONFIG_SND_SOC_TAS6424) += snd-soc-tas6424.o
obj-$(CONFIG_SND_SOC_TDA7419) += snd-soc-tda7419.o
obj-$(CONFIG_SND_SOC_TAS2770) += snd-soc-tas2770.o
diff --git a/sound/soc/codecs/tas5805m.c b/sound/soc/codecs/tas5805m.c
new file mode 100644
index 000000000000..300d28bb053d
--- /dev/null
+++ b/sound/soc/codecs/tas5805m.c
@@ -0,0 +1,554 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Driver for the TAS5805M Audio Amplifier
+//
+// Author: Andy Liu <andy-liu@xxxxxx>
+// Author: Daniel Beer <daniel.beer@xxxxxxxxxxxxxxxxx>
+//
+// This is based on a driver originally written by Andy Liu at TI and
+// posted here:
+//
+// https://e2e.ti.com/support/audio-group/audio/f/audio-forum/722027/linux-tas5825m-linux-drivers
+//
+// It has been simplified a little and reworked for the 5.x ALSA SoC API.
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+#include <linux/atomic.h>
+#include <linux/workqueue.h>
+
+#include <sound/soc.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+
+/* Datasheet-defined registers on page 0, book 0 */
+#define REG_PAGE 0x00
+#define REG_DEVICE_CTRL_1 0x02
+#define REG_DEVICE_CTRL_2 0x03
+#define REG_SIG_CH_CTRL 0x28
+#define REG_SAP_CTRL_1 0x33
+#define REG_FS_MON 0x37
+#define REG_BCK_MON 0x38
+#define REG_CLKDET_STATUS 0x39
+#define REG_VOL_CTL 0x4c
+#define REG_AGAIN 0x54
+#define REG_ADR_PIN_CTRL 0x60
+#define REG_ADR_PIN_CONFIG 0x61
+#define REG_CHAN_FAULT 0x70
+#define REG_GLOBAL_FAULT1 0x71
+#define REG_GLOBAL_FAULT2 0x72
+#define REG_FAULT 0x78
+#define REG_BOOK 0x7f
+
+/* DEVICE_CTRL_2 register values */
+#define DCTRL2_MODE_DEEP_SLEEP 0x00
+#define DCTRL2_MODE_SLEEP 0x01
+#define DCTRL2_MODE_HIZ 0x02
+#define DCTRL2_MODE_PLAY 0x03
+
+#define DCTRL2_MUTE 0x08
+#define DCTRL2_DIS_DSP 0x10
+
+/* This sequence of register writes must always be sent, prior to the
+ * 5ms delay while we wait for the DSP to boot.
+ */
+static const uint8_t dsp_cfg_preboot[] = {
+ 0x00, 0x00, 0x7f, 0x00, 0x03, 0x02, 0x01, 0x11,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x7f, 0x00, 0x03, 0x02,
+};
+
+static const uint32_t tas5805m_volume[] = {
+ 0x0000001B, /* 0, -110dB */ 0x0000001E, /* 1, -109dB */
+ 0x00000021, /* 2, -108dB */ 0x00000025, /* 3, -107dB */
+ 0x0000002A, /* 4, -106dB */ 0x0000002F, /* 5, -105dB */
+ 0x00000035, /* 6, -104dB */ 0x0000003B, /* 7, -103dB */
+ 0x00000043, /* 8, -102dB */ 0x0000004B, /* 9, -101dB */
+ 0x00000054, /* 10, -100dB */ 0x0000005E, /* 11, -99dB */
+ 0x0000006A, /* 12, -98dB */ 0x00000076, /* 13, -97dB */
+ 0x00000085, /* 14, -96dB */ 0x00000095, /* 15, -95dB */
+ 0x000000A7, /* 16, -94dB */ 0x000000BC, /* 17, -93dB */
+ 0x000000D3, /* 18, -92dB */ 0x000000EC, /* 19, -91dB */
+ 0x00000109, /* 20, -90dB */ 0x0000012A, /* 21, -89dB */
+ 0x0000014E, /* 22, -88dB */ 0x00000177, /* 23, -87dB */
+ 0x000001A4, /* 24, -86dB */ 0x000001D8, /* 25, -85dB */
+ 0x00000211, /* 26, -84dB */ 0x00000252, /* 27, -83dB */
+ 0x0000029A, /* 28, -82dB */ 0x000002EC, /* 29, -81dB */
+ 0x00000347, /* 30, -80dB */ 0x000003AD, /* 31, -79dB */
+ 0x00000420, /* 32, -78dB */ 0x000004A1, /* 33, -77dB */
+ 0x00000532, /* 34, -76dB */ 0x000005D4, /* 35, -75dB */
+ 0x0000068A, /* 36, -74dB */ 0x00000756, /* 37, -73dB */
+ 0x0000083B, /* 38, -72dB */ 0x0000093C, /* 39, -71dB */
+ 0x00000A5D, /* 40, -70dB */ 0x00000BA0, /* 41, -69dB */
+ 0x00000D0C, /* 42, -68dB */ 0x00000EA3, /* 43, -67dB */
+ 0x0000106C, /* 44, -66dB */ 0x0000126D, /* 45, -65dB */
+ 0x000014AD, /* 46, -64dB */ 0x00001733, /* 47, -63dB */
+ 0x00001A07, /* 48, -62dB */ 0x00001D34, /* 49, -61dB */
+ 0x000020C5, /* 50, -60dB */ 0x000024C4, /* 51, -59dB */
+ 0x00002941, /* 52, -58dB */ 0x00002E49, /* 53, -57dB */
+ 0x000033EF, /* 54, -56dB */ 0x00003A45, /* 55, -55dB */
+ 0x00004161, /* 56, -54dB */ 0x0000495C, /* 57, -53dB */
+ 0x0000524F, /* 58, -52dB */ 0x00005C5A, /* 59, -51dB */
+ 0x0000679F, /* 60, -50dB */ 0x00007444, /* 61, -49dB */
+ 0x00008274, /* 62, -48dB */ 0x0000925F, /* 63, -47dB */
+ 0x0000A43B, /* 64, -46dB */ 0x0000B845, /* 65, -45dB */
+ 0x0000CEC1, /* 66, -44dB */ 0x0000E7FB, /* 67, -43dB */
+ 0x00010449, /* 68, -42dB */ 0x0001240C, /* 69, -41dB */
+ 0x000147AE, /* 70, -40dB */ 0x00016FAA, /* 71, -39dB */
+ 0x00019C86, /* 72, -38dB */ 0x0001CEDC, /* 73, -37dB */
+ 0x00020756, /* 74, -36dB */ 0x000246B5, /* 75, -35dB */
+ 0x00028DCF, /* 76, -34dB */ 0x0002DD96, /* 77, -33dB */
+ 0x00033718, /* 78, -32dB */ 0x00039B87, /* 79, -31dB */
+ 0x00040C37, /* 80, -30dB */ 0x00048AA7, /* 81, -29dB */
+ 0x00051884, /* 82, -28dB */ 0x0005B7B1, /* 83, -27dB */
+ 0x00066A4A, /* 84, -26dB */ 0x000732AE, /* 85, -25dB */
+ 0x00081385, /* 86, -24dB */ 0x00090FCC, /* 87, -23dB */
+ 0x000A2ADB, /* 88, -22dB */ 0x000B6873, /* 89, -21dB */
+ 0x000CCCCD, /* 90, -20dB */ 0x000E5CA1, /* 91, -19dB */
+ 0x00101D3F, /* 92, -18dB */ 0x0012149A, /* 93, -17dB */
+ 0x00144961, /* 94, -16dB */ 0x0016C311, /* 95, -15dB */
+ 0x00198A13, /* 96, -14dB */ 0x001CA7D7, /* 97, -13dB */
+ 0x002026F3, /* 98, -12dB */ 0x00241347, /* 99, -11dB */
+ 0x00287A27, /* 100, -10dB */ 0x002D6A86, /* 101, -9dB */
+ 0x0032F52D, /* 102, -8dB */ 0x00392CEE, /* 103, -7dB */
+ 0x004026E7, /* 104, -6dB */ 0x0047FACD, /* 105, -5dB */
+ 0x0050C336, /* 106, -4dB */ 0x005A9DF8, /* 107, -3dB */
+ 0x0065AC8C, /* 108, -2dB */ 0x00721483, /* 109, -1dB */
+ 0x00800000, /* 110, 0dB */ 0x008F9E4D, /* 111, 1dB */
+ 0x00A12478, /* 112, 2dB */ 0x00B4CE08, /* 113, 3dB */
+ 0x00CADDC8, /* 114, 4dB */ 0x00E39EA9, /* 115, 5dB */
+ 0x00FF64C1, /* 116, 6dB */ 0x011E8E6A, /* 117, 7dB */
+ 0x0141857F, /* 118, 8dB */ 0x0168C0C6, /* 119, 9dB */
+ 0x0194C584, /* 120, 10dB */ 0x01C62940, /* 121, 11dB */
+ 0x01FD93C2, /* 122, 12dB */ 0x023BC148, /* 123, 13dB */
+ 0x02818508, /* 124, 14dB */ 0x02CFCC01, /* 125, 15dB */
+ 0x0327A01A, /* 126, 16dB */ 0x038A2BAD, /* 127, 17dB */
+ 0x03F8BD7A, /* 128, 18dB */ 0x0474CD1B, /* 129, 19dB */
+ 0x05000000, /* 130, 20dB */ 0x059C2F02, /* 131, 21dB */
+ 0x064B6CAE, /* 132, 22dB */ 0x07100C4D, /* 133, 23dB */
+ 0x07ECA9CD, /* 134, 24dB */ 0x08E43299, /* 135, 25dB */
+ 0x09F9EF8E, /* 136, 26dB */ 0x0B319025, /* 137, 27dB */
+ 0x0C8F36F2, /* 138, 28dB */ 0x0E1787B8, /* 139, 29dB */
+ 0x0FCFB725, /* 140, 30dB */ 0x11BD9C84, /* 141, 31dB */
+ 0x13E7C594, /* 142, 32dB */ 0x16558CCB, /* 143, 33dB */
+ 0x190F3254, /* 144, 34dB */ 0x1C1DF80E, /* 145, 35dB */
+ 0x1F8C4107, /* 146, 36dB */ 0x2365B4BF, /* 147, 37dB */
+ 0x27B766C2, /* 148, 38dB */ 0x2C900313, /* 149, 39dB */
+ 0x32000000, /* 150, 40dB */ 0x3819D612, /* 151, 41dB */
+ 0x3EF23ECA, /* 152, 42dB */ 0x46A07B07, /* 153, 43dB */
+ 0x4F3EA203, /* 154, 44dB */ 0x58E9F9F9, /* 155, 45dB */
+ 0x63C35B8E, /* 156, 46dB */ 0x6FEFA16D, /* 157, 47dB */
+ 0x7D982575, /* 158, 48dB */
+};
+
+#define TAS5805M_VOLUME_MAX ((int)ARRAY_SIZE(tas5805m_volume) - 1)
+#define TAS5805M_VOLUME_MIN 0
+
+struct tas5805m_priv {
+ struct regulator *pvdd;
+ struct gpio_desc *gpio_pdn_n;
+
+ uint8_t *dsp_cfg_data;
+ int dsp_cfg_len;
+
+ struct regmap *regmap;
+ struct mutex lock;
+
+ int vol[2];
+ bool is_powered;
+ bool is_muted;
+};
+
+static void set_dsp_scale(struct regmap *rm, int offset, int vol)
+{
+ uint8_t v[4];
+ uint32_t x = tas5805m_volume[vol];
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ v[3 - i] = x;
+ x >>= 8;
+ }
+
+ regmap_bulk_write(rm, offset, v, ARRAY_SIZE(v));
+}
+
+static void tas5805m_refresh_unlocked(struct snd_soc_component *component)
+{
+ struct tas5805m_priv *tas5805m =
+ snd_soc_component_get_drvdata(component);
+ struct regmap *rm = tas5805m->regmap;
+
+ dev_dbg(component->dev, "refresh: is_muted=%d, vol=%d/%d\n",
+ tas5805m->is_muted, tas5805m->vol[0], tas5805m->vol[1]);
+
+ regmap_write(rm, REG_PAGE, 0x00);
+ regmap_write(rm, REG_BOOK, 0x8c);
+ regmap_write(rm, REG_PAGE, 0x2a);
+
+ /* Refresh volume. The actual volume control documented in the
+ * datasheet doesn't seem to work correctly. This is a pair of
+ * DSP registers which are *not* documented in the datasheet.
+ */
+ set_dsp_scale(rm, 0x24, tas5805m->vol[0]);
+ set_dsp_scale(rm, 0x28, tas5805m->vol[1]);
+
+ /* Set/clear digital soft-mute */
+ regmap_write(rm, REG_DEVICE_CTRL_2,
+ (tas5805m->is_muted ? DCTRL2_MUTE : 0) |
+ DCTRL2_MODE_PLAY);
+}
+
+static int tas5805m_vol_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 2;
+
+ uinfo->value.integer.min = TAS5805M_VOLUME_MIN;
+ uinfo->value.integer.max = TAS5805M_VOLUME_MAX;
+ return 0;
+}
+
+static int tas5805m_vol_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *component =
+ snd_soc_kcontrol_component(kcontrol);
+ struct tas5805m_priv *tas5805m =
+ snd_soc_component_get_drvdata(component);
+
+ mutex_lock(&tas5805m->lock);
+ ucontrol->value.integer.value[0] = tas5805m->vol[0];
+ ucontrol->value.integer.value[1] = tas5805m->vol[1];
+ mutex_unlock(&tas5805m->lock);
+
+ return 0;
+}
+
+static inline int volume_is_valid(int v)
+{
+ return (v >= TAS5805M_VOLUME_MIN) && (v <= TAS5805M_VOLUME_MAX);
+}
+
+static int tas5805m_vol_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *component =
+ snd_soc_kcontrol_component(kcontrol);
+ struct tas5805m_priv *tas5805m =
+ snd_soc_component_get_drvdata(component);
+
+ if (!(volume_is_valid(ucontrol->value.integer.value[0]) &&
+ volume_is_valid(ucontrol->value.integer.value[1])))
+ return -EINVAL;
+
+ mutex_lock(&tas5805m->lock);
+ tas5805m->vol[0] = ucontrol->value.integer.value[0];
+ tas5805m->vol[1] = ucontrol->value.integer.value[1];
+ dev_dbg(component->dev, "set vol=%d/%d (is_powered=%d)\n",
+ tas5805m->vol[0], tas5805m->vol[1], tas5805m->is_powered);
+ if (tas5805m->is_powered)
+ tas5805m_refresh_unlocked(component);
+ mutex_unlock(&tas5805m->lock);
+
+ return 0;
+}
+
+static const struct snd_kcontrol_new tas5805m_snd_controls[] = {
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "Master Playback Volume",
+ .access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |
+ SNDRV_CTL_ELEM_ACCESS_READWRITE,
+ .info = tas5805m_vol_info,
+ .get = tas5805m_vol_get,
+ .put = tas5805m_vol_put,
+ },
+};
+
+static void send_cfg(struct regmap *rm,
+ const uint8_t *s, unsigned int len)
+{
+ unsigned int i;
+
+ for (i = 0; i + 1 < len; i += 2)
+ regmap_write(rm, s[i], s[i + 1]);
+}
+
+/* The TAS5805M DSP can't be configured until the I2S clock has been
+ * present and stable for 5ms, or else it won't boot and we get no
+ * sound.
+ */
+static int tas5805m_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ struct tas5805m_priv *tas5805m =
+ snd_soc_component_get_drvdata(component);
+ struct regmap *rm = tas5805m->regmap;
+ unsigned int chan, global1, global2;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ dev_dbg(component->dev, "DSP startup\n");
+
+ /* We mustn't issue any I2C transactions until the I2S
+ * clock is stable. Furthermore, we must allow a 5ms
+ * delay after the first set of register writes to
+ * allow the DSP to boot before configuring it.
+ */
+ mutex_lock(&tas5805m->lock);
+ usleep_range(5000, 10000);
+ send_cfg(rm, dsp_cfg_preboot,
+ ARRAY_SIZE(dsp_cfg_preboot));
+ usleep_range(5000, 15000);
+ send_cfg(rm, tas5805m->dsp_cfg_data,
+ tas5805m->dsp_cfg_len);
+
+ tas5805m->is_powered = true;
+ tas5805m_refresh_unlocked(component);
+ mutex_unlock(&tas5805m->lock);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ dev_dbg(component->dev, "DSP shutdown\n");
+
+ mutex_lock(&tas5805m->lock);
+ tas5805m->is_powered = false;
+
+ regmap_write(rm, REG_PAGE, 0x00);
+ regmap_write(rm, REG_BOOK, 0x00);
+
+ regmap_read(rm, REG_CHAN_FAULT, &chan);
+ regmap_read(rm, REG_GLOBAL_FAULT1, &global1);
+ regmap_read(rm, REG_GLOBAL_FAULT2, &global2);
+
+ dev_dbg(component->dev,
+ "fault regs: CHAN=%02x, GLOBAL1=%02x, GLOBAL2=%02x\n",
+ chan, global1, global2);
+
+ regmap_write(rm, REG_DEVICE_CTRL_2, DCTRL2_MODE_HIZ);
+ mutex_unlock(&tas5805m->lock);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dapm_route tas5805m_audio_map[] = {
+ { "DAC", NULL, "DAC IN" },
+ { "OUT", NULL, "DAC" },
+};
+
+static const struct snd_soc_dapm_widget tas5805m_dapm_widgets[] = {
+ SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
+ SND_SOC_DAPM_DAC("DAC", NULL, SND_SOC_NOPM, 0, 0),
+ SND_SOC_DAPM_OUTPUT("OUT")
+};
+
+static const struct snd_soc_component_driver soc_codec_dev_tas5805m = {
+ .controls = tas5805m_snd_controls,
+ .num_controls = ARRAY_SIZE(tas5805m_snd_controls),
+ .dapm_widgets = tas5805m_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(tas5805m_dapm_widgets),
+ .dapm_routes = tas5805m_audio_map,
+ .num_dapm_routes = ARRAY_SIZE(tas5805m_audio_map),
+ .use_pmdown_time = 1,
+ .endianness = 1,
+ .non_legacy_dai_naming = 1,
+};
+
+static int tas5805m_mute(struct snd_soc_dai *dai, int mute, int direction)
+{
+ struct snd_soc_component *component = dai->component;
+ struct tas5805m_priv *tas5805m =
+ snd_soc_component_get_drvdata(component);
+
+ mutex_lock(&tas5805m->lock);
+ dev_dbg(component->dev, "set mute=%d (is_powered=%d)\n",
+ mute, tas5805m->is_powered);
+ tas5805m->is_muted = !!mute;
+ if (tas5805m->is_powered)
+ tas5805m_refresh_unlocked(component);
+ mutex_unlock(&tas5805m->lock);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops tas5805m_dai_ops = {
+ .trigger = tas5805m_trigger,
+ .mute_stream = tas5805m_mute,
+ .no_capture_mute = 1,
+};
+
+static struct snd_soc_dai_driver tas5805m_dai = {
+ .name = "tas5805m-amplifier",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_48000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .ops = &tas5805m_dai_ops,
+};
+
+static const struct regmap_config tas5805m_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ /* We have quite a lot of multi-level bank switching and a
+ * relatively small number of register writes between bank
+ * switches.
+ */
+ .cache_type = REGCACHE_NONE,
+};
+
+static int tas5805m_i2c_probe(struct i2c_client *i2c)
+{
+ struct device *dev = &i2c->dev;
+ struct regmap *regmap;
+ struct tas5805m_priv *tas5805m;
+ int ret;
+
+ regmap = devm_regmap_init_i2c(i2c, &tas5805m_regmap);
+ if (IS_ERR(regmap)) {
+ ret = PTR_ERR(regmap);
+ dev_err(dev, "unable to allocate register map: %d\n", ret);
+ return ret;
+ }
+
+ tas5805m = devm_kzalloc(dev, sizeof(struct tas5805m_priv), GFP_KERNEL);
+ if (!tas5805m)
+ return -ENOMEM;
+
+ tas5805m->pvdd = devm_regulator_get(dev, "pvdd");
+ if (IS_ERR(tas5805m->pvdd)) {
+ dev_err(dev, "failed to get pvdd supply: %ld\n",
+ PTR_ERR(tas5805m->pvdd));
+ return PTR_ERR(tas5805m->pvdd);
+ }
+
+ dev_set_drvdata(dev, tas5805m);
+ tas5805m->regmap = regmap;
+ tas5805m->gpio_pdn_n = devm_gpiod_get(dev, "pdn", GPIOD_OUT_LOW);
+ if (IS_ERR(tas5805m->gpio_pdn_n)) {
+ dev_err(dev, "error requesting PDN gpio: %ld\n",
+ PTR_ERR(tas5805m->gpio_pdn_n));
+ return PTR_ERR(tas5805m->gpio_pdn_n);
+ }
+
+ tas5805m->dsp_cfg_len = of_property_count_elems_of_size(dev->of_node,
+ "ti,dsp-config", 1);
+ if (tas5805m->dsp_cfg_len < 0) {
+ dev_err(dev, "no DSP config provided\n");
+ return tas5805m->dsp_cfg_len;
+ }
+
+ tas5805m->dsp_cfg_data = devm_kmalloc(dev, tas5805m->dsp_cfg_len,
+ GFP_KERNEL);
+ if (!tas5805m->dsp_cfg_data)
+ return -ENOMEM;
+
+ of_property_read_u8_array(dev->of_node, "ti,dsp-config",
+ tas5805m->dsp_cfg_data, tas5805m->dsp_cfg_len);
+ dev_dbg(dev, "%d bytes of DSP config loaded\n",
+ tas5805m->dsp_cfg_len);
+
+ /* Do the first part of the power-on here, while we can expect
+ * the I2S interface to be quiet. We must raise PDN# and then
+ * wait 5ms before any I2S clock is sent, or else the internal
+ * regulator apparently won't come on.
+ *
+ * Also, we must keep the device in power down for 100ms or so
+ * after PVDD is applied, or else the ADR pin is sampled
+ * incorrectly and the device comes up with an unpredictable I2C
+ * address.
+ */
+ tas5805m->vol[0] = TAS5805M_VOLUME_MIN;
+ tas5805m->vol[1] = TAS5805M_VOLUME_MIN;
+ mutex_init(&tas5805m->lock);
+
+ ret = regulator_enable(tas5805m->pvdd);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable pvdd: %d\n", ret);
+ return ret;
+ }
+
+ usleep_range(100000, 150000);
+ gpiod_set_value(tas5805m->gpio_pdn_n, 1);
+ usleep_range(10000, 15000);
+
+ /* Don't register through devm. We need to be able to unregister
+ * the component prior to deasserting PDN#
+ */
+ ret = snd_soc_register_component(dev, &soc_codec_dev_tas5805m,
+ &tas5805m_dai, 1);
+ if (ret < 0) {
+ dev_err(dev, "unable to register codec: %d\n", ret);
+ gpiod_set_value(tas5805m->gpio_pdn_n, 0);
+ regulator_disable(tas5805m->pvdd);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int tas5805m_i2c_remove(struct i2c_client *i2c)
+{
+ struct device *dev = &i2c->dev;
+ struct tas5805m_priv *tas5805m = dev_get_drvdata(dev);
+
+ snd_soc_unregister_component(dev);
+ gpiod_set_value(tas5805m->gpio_pdn_n, 0);
+ usleep_range(10000, 15000);
+ regulator_disable(tas5805m->pvdd);
+ return 0;
+}
+
+static const struct i2c_device_id tas5805m_i2c_id[] = {
+ { "tas5805m", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tas5805m_i2c_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id tas5805m_of_match[] = {
+ { .compatible = "ti,tas5805m", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tas5805m_of_match);
+#endif
+
+static struct i2c_driver tas5805m_i2c_driver = {
+ .probe_new = tas5805m_i2c_probe,
+ .remove = tas5805m_i2c_remove,
+ .id_table = tas5805m_i2c_id,
+ .driver = {
+ .name = "tas5805m",
+ .of_match_table = of_match_ptr(tas5805m_of_match),
+ },
+};
+
+module_i2c_driver(tas5805m_i2c_driver);
+
+MODULE_AUTHOR("Andy Liu <andy-liu@xxxxxx>");
+MODULE_AUTHOR("Daniel Beer <daniel.beer@xxxxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("TAS5805M Audio Amplifier Driver");
+MODULE_LICENSE("GPL v2");
--
2.30.2