ASoC: codecs: wcd9378: add SoundWire skeleton driver (WIP)
Bring-up skeleton for the Qualcomm WCD9378 codec (SoundWire dev id 0x0217:0x0110, one slave per RX/TX bus). Probes both slaves, maps the SDCA control space (32-bit paged addresses) through regmap-sdw with prop.paging_support set, and dumps the device identity registers on ATTACHED as a transport self-test: DEV_MANU_ID_0/1 = 0x17/0x02 (Qualcomm 0x0217) DEV_PART_ID_0/1 = 0x10/0x01 (WCD9378 0x0110) ANA_TX_CH1 0x20, ANA_MICB1 0x10 (downstream reset defaults) The analog core is WCD937x register-compatible; full codec function (TX/ADC path first) to be built on top of this. Not for upstream in this form. Assisted-by: Claude:claude-fable-5 Signed-off-by: Jorijn van der Graaf <jorijnvdgraaf@catcrafts.net>
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@ -2431,6 +2431,15 @@ config SND_SOC_WCD937X_SDW
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via soundwire.
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To compile this codec driver say Y or m.
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config SND_SOC_WCD9378_SDW
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tristate "WCD9378 Codec - SDW (bring-up skeleton)"
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depends on SOUNDWIRE
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select REGMAP_SOUNDWIRE
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help
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Bring-up skeleton driver for the Qualcomm WCD9378 audio codec
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connected via SoundWire, as found on SM7635 phones.
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To compile this codec driver say Y or m.
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config SND_SOC_WCD938X
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depends on SND_SOC_WCD938X_SDW
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tristate
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@ -356,6 +356,7 @@ snd-soc-wcd9335-y := wcd9335.o
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snd-soc-wcd934x-y := wcd934x.o
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snd-soc-wcd937x-y := wcd937x.o
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snd-soc-wcd937x-sdw-y := wcd937x-sdw.o
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snd-soc-wcd9378-sdw-y := wcd9378-sdw.o
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snd-soc-wcd938x-y := wcd938x.o
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snd-soc-wcd938x-sdw-y := wcd938x-sdw.o
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snd-soc-wcd939x-y := wcd939x.o
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@ -796,6 +797,7 @@ ifdef CONFIG_SND_SOC_WCD937X_SDW
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# avoid link failure by forcing sdw code built-in when needed
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obj-$(CONFIG_SND_SOC_WCD937X) += snd-soc-wcd937x-sdw.o
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endif
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obj-$(CONFIG_SND_SOC_WCD9378_SDW) += snd-soc-wcd9378-sdw.o
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obj-$(CONFIG_SND_SOC_WCD938X) += snd-soc-wcd938x.o
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ifdef CONFIG_SND_SOC_WCD938X_SDW
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# avoid link failure by forcing sdw code built-in when needed
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135
sound/soc/codecs/wcd9378-sdw.c
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135
sound/soc/codecs/wcd9378-sdw.c
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@ -0,0 +1,135 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2026, Jorijn van der Graaf
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*
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* SoundWire slave driver for the Qualcomm WCD9378 audio codec.
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*
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* Bring-up skeleton: binds to the two WCD9378 SoundWire devices (TX and
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* RX), maps the SDCA control space through regmap and verifies the device
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* identity registers. No audio paths yet.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_registers.h>
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#include <linux/soundwire/sdw_type.h>
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#include "wcd9378.h"
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struct wcd9378_sdw_priv {
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struct sdw_slave *sdev;
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struct regmap *regmap;
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};
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static const struct regmap_config wcd9378_sdw_regmap_config = {
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.name = "wcd9378_sdw",
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.reg_bits = 32,
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.val_bits = 8,
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.cache_type = REGCACHE_NONE,
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.max_register = WCD9378_MAX_REGISTER,
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};
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static void wcd9378_sdw_read_id(struct wcd9378_sdw_priv *wcd)
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{
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struct device *dev = &wcd->sdev->dev;
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static const struct {
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const char *name;
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unsigned int reg;
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} id_regs[] = {
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{ "DEV_MANU_ID_0", WCD9378_DEV_MANU_ID_0 },
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{ "DEV_MANU_ID_1", WCD9378_DEV_MANU_ID_1 },
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{ "DEV_PART_ID_0", WCD9378_DEV_PART_ID_0 },
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{ "DEV_PART_ID_1", WCD9378_DEV_PART_ID_1 },
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{ "DEV_VER", WCD9378_DEV_VER },
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{ "FUNC_EXT_ID_0", WCD9378_FUNC_EXT_ID_0 },
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{ "FUNC_EXT_ID_1", WCD9378_FUNC_EXT_ID_1 },
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{ "ANA_BIAS", WCD9378_ANA_BIAS },
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{ "ANA_TX_CH1", WCD9378_ANA_TX_CH1 },
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{ "ANA_MICB1", WCD9378_ANA_MICB1 },
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{ "SYS_USAGE_CTRL", WCD9378_SYS_USAGE_CTRL },
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};
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unsigned int val, packed, pval;
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int i, ret, pret;
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for (i = 0; i < ARRAY_SIZE(id_regs); i++) {
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/* downstream WCD9378_REG() wire packing */
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packed = ((id_regs[i].reg & 0x0ff00000) >> 8) |
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(id_regs[i].reg & 0xfff);
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ret = regmap_read(wcd->regmap, id_regs[i].reg, &val);
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pret = regmap_read(wcd->regmap, packed, &pval);
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dev_info(dev, "%s: virt %#010x = %#04x (ret %d), packed %#07x = %#04x (ret %d)\n",
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id_regs[i].name,
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id_regs[i].reg, ret ? 0xdead : val, ret,
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packed, pret ? 0xdead : pval, pret);
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}
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}
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static int wcd9378_sdw_update_status(struct sdw_slave *slave,
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enum sdw_slave_status status)
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{
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struct wcd9378_sdw_priv *wcd = dev_get_drvdata(&slave->dev);
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dev_info(&slave->dev, "status %d (dev_num %d)\n", status,
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slave->dev_num);
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if (status == SDW_SLAVE_ATTACHED)
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wcd9378_sdw_read_id(wcd);
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return 0;
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}
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static const struct sdw_slave_ops wcd9378_sdw_ops = {
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.update_status = wcd9378_sdw_update_status,
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};
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static int wcd9378_sdw_probe(struct sdw_slave *pdev,
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const struct sdw_device_id *id)
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{
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struct device *dev = &pdev->dev;
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struct wcd9378_sdw_priv *wcd;
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wcd = devm_kzalloc(dev, sizeof(*wcd), GFP_KERNEL);
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if (!wcd)
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return -ENOMEM;
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wcd->sdev = pdev;
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dev_set_drvdata(dev, wcd);
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pdev->prop.scp_int1_mask = SDW_SCP_INT1_IMPL_DEF |
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SDW_SCP_INT1_BUS_CLASH |
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SDW_SCP_INT1_PARITY;
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pdev->prop.simple_clk_stop_capable = true;
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/* The SDCA control space sits above the 16-bit address range */
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pdev->prop.paging_support = true;
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wcd->regmap = devm_regmap_init_sdw(pdev, &wcd9378_sdw_regmap_config);
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if (IS_ERR(wcd->regmap))
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return dev_err_probe(dev, PTR_ERR(wcd->regmap),
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"regmap init failed\n");
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dev_info(dev, "wcd9378 sdw slave probed\n");
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return 0;
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}
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static const struct sdw_device_id wcd9378_sdw_id[] = {
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SDW_SLAVE_ENTRY(0x0217, 0x0110, 0),
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{ },
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};
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MODULE_DEVICE_TABLE(sdw, wcd9378_sdw_id);
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static struct sdw_driver wcd9378_sdw_driver = {
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.probe = wcd9378_sdw_probe,
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.ops = &wcd9378_sdw_ops,
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.id_table = wcd9378_sdw_id,
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.driver = {
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.name = "wcd9378-sdw",
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},
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};
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module_sdw_driver(wcd9378_sdw_driver);
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MODULE_DESCRIPTION("WCD9378 SoundWire slave driver");
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MODULE_LICENSE("GPL");
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63
sound/soc/codecs/wcd9378.h
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63
sound/soc/codecs/wcd9378.h
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@ -0,0 +1,63 @@
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2026, Jorijn van der Graaf
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*
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* Register map for the Qualcomm WCD9378 audio codec.
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*
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* The codec exposes its control registers in the SoundWire SDCA control
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* address space (bit 30 set, SDCA function number in bits 25:22), accessed
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* through the TX SoundWire slave. The analog core registers (function 0,
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* implementation-defined region at +0x180000) are layout-compatible with
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* the WCD937x family.
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*/
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#ifndef __WCD9378_H__
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#define __WCD9378_H__
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#include <linux/regmap.h>
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#include <sound/soc.h>
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/* SDCA function 0 (extension unit): device identity */
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#define WCD9378_FUNC_EXT_ID_0 0x40000048
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#define WCD9378_FUNC_EXT_ID_1 0x40000049
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#define WCD9378_FUNC_EXT_VER 0x40000050
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#define WCD9378_FUNC_STAT 0x40080000
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#define WCD9378_DEV_MANU_ID_0 0x40100060
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#define WCD9378_DEV_MANU_ID_1 0x40100061
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#define WCD9378_DEV_PART_ID_0 0x40100068
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#define WCD9378_DEV_PART_ID_1 0x40100069
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#define WCD9378_DEV_VER 0x40100070
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/* Analog core (WCD937x-compatible layout), function 0 + 0x180000 */
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#define WCD9378_ANA_PAGE 0x40180000
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#define WCD9378_ANA_BIAS 0x40180001
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#define WCD9378_ANA_RX_SUPPLIES 0x40180008
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#define WCD9378_ANA_TX_CH1 0x4018000e
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#define WCD9378_ANA_TX_CH2 0x4018000f
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#define WCD9378_ANA_TX_CH3 0x40180010
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#define WCD9378_ANA_MICB1 0x40180022
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#define WCD9378_ANA_MICB2 0x40180023
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#define WCD9378_ANA_MICB2_RAMP 0x40180024
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#define WCD9378_ANA_MICB3 0x40180025
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/* Sequencer block (SEQR) */
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#define WCD9378_SYS_USAGE_CTRL 0x40180501
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#define WCD9378_SM0_MB_SEL 0x401805b0
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#define WCD9378_SM1_MB_SEL 0x401805b1
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#define WCD9378_SM2_MB_SEL 0x401805b2
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/* SDCA function activation (one per function) */
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#define WCD9378_SMP_AMP_FUNC_STAT 0x40880000
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#define WCD9378_SMP_AMP_FUNC_ACT 0x40880008
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#define WCD9378_SMP_JACK_FUNC_STAT 0x40c80000
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#define WCD9378_SMP_JACK_FUNC_ACT 0x40c80008
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#define WCD9378_SMP_MIC_CTRL0_FUNC_STAT 0x41080000
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#define WCD9378_SMP_MIC_CTRL0_FUNC_ACT 0x41080008
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#define WCD9378_SMP_MIC_CTRL1_FUNC_STAT 0x41480000
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#define WCD9378_SMP_MIC_CTRL1_FUNC_ACT 0x41480008
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#define WCD9378_SMP_MIC_CTRL2_FUNC_STAT 0x41880000
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#define WCD9378_SMP_MIC_CTRL2_FUNC_ACT 0x41880008
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#define WCD9378_MAX_REGISTER 0x41900070
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#endif /* __WCD9378_H__ */
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