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ASoC: SDCA: Generic interrupt support

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Add a library supporting usage of SDCA interrupts, using regmap irq
framework. The library adds functions for parsing ACPI for
interrupt-related information, configuring irq chip and requesting
individual irqs. Calling code (SDCA function code) is expected to also
substitute the library's base irq handler for its own, appropriate
callback.

Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20250624122844.2761627-7-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Maciej Strozek 2025-06-24 13:28:43 +01:00 committed by Mark Brown
parent 775f5729b4
commit b126394d9e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
4 changed files with 369 additions and 2 deletions
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75
include/sound/sdca_interrupts.h Normal file
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@ -0,0 +1,75 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* The MIPI SDCA specification is available for public downloads at
* https://www.mipi.org/mipi-sdca-v1-0-download
*
* Copyright (C) 2025 Cirrus Logic, Inc. and
* Cirrus Logic International Semiconductor Ltd.
*/
#ifndef __SDCA_INTERRUPTS_H__
#define __SDCA_INTERRUPTS_H__
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/regmap.h>
struct device;
struct snd_soc_component;
struct sdca_function_data;
#define SDCA_MAX_INTERRUPTS 31 /* the last bit is reserved for future extensions */
/**
* struct sdca_interrupt - contains information about a single SDCA interrupt
* @name: The name of the interrupt.
* @component: Pointer to the ASoC component owns the interrupt.
* @function: Pointer to the Function that the interrupt is associated with.
* @entity: Pointer to the Entity that the interrupt is associated with.
* @control: Pointer to the Control that the interrupt is associated with.
* @externally_requested: Internal flag used to check if a client driver has
* already requested the interrupt, for custom handling, allowing the core to
* skip handling this interrupt.
*/
struct sdca_interrupt {
const char *name;
struct snd_soc_component *component;
struct sdca_function_data *function;
struct sdca_entity *entity;
struct sdca_control *control;
bool externally_requested;
};
/**
* struct sdca_interrupt_info - contains top-level SDCA interrupt information
* @irq_chip: regmap irq chip structure.
* @irq_data: regmap irq chip data structure.
* @irqs: Array of data for each individual IRQ.
* @irq_lock: Protects access to the list of sdca_interrupt structures.
*/
struct sdca_interrupt_info {
struct regmap_irq_chip irq_chip;
struct regmap_irq_chip_data *irq_data;
struct sdca_interrupt irqs[SDCA_MAX_INTERRUPTS];
struct mutex irq_lock; /* Protect irqs list across functions */
};
int sdca_irq_request(struct device *dev, struct sdca_interrupt_info *interrupt_info,
int sdca_irq, const char *name, irq_handler_t handler,
void *data);
int sdca_irq_data_populate(struct snd_soc_component *component,
struct sdca_function_data *function,
struct sdca_entity *entity,
struct sdca_control *control,
struct sdca_interrupt *interrupt);
int sdca_irq_populate(struct sdca_function_data *function,
struct snd_soc_component *component,
struct sdca_interrupt_info *info);
struct sdca_interrupt_info *sdca_irq_allocate(struct device *dev,
struct regmap *regmap, int irq);
#endif

7
sound/soc/sdca/Kconfig
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@ -13,3 +13,10 @@ config SND_SOC_SDCA_OPTIONAL
config SND_SOC_SDCA_HID
tristate "SDCA HID support"
depends on SND_SOC_SDCA && HID
config SND_SOC_SDCA_IRQ
tristate
select REGMAP
select REGMAP_IRQ
help
This option enables support for SDCA IRQs.

5
sound/soc/sdca/Makefile
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@ -1,8 +1,9 @@
# SPDX-License-Identifier: GPL-2.0-only
snd-soc-sdca-y := sdca_functions.o sdca_device.o sdca_regmap.o sdca_asoc.o
snd-soc-sdca-hid-y := sdca_hid.o
snd-soc-sdca-irq-y := sdca_interrupts.o
obj-$(CONFIG_SND_SOC_SDCA_HID) += snd-soc-sdca-hid.o
obj-$(CONFIG_SND_SOC_SDCA) += snd-soc-sdca.o
obj-$(CONFIG_SND_SOC_SDCA_HID) += snd-soc-sdca-hid.o
obj-$(CONFIG_SND_SOC_SDCA_IRQ) += snd-soc-sdca-irq.o

284
sound/soc/sdca/sdca_interrupts.c Normal file
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@ -0,0 +1,284 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2025 Cirrus Logic, Inc. and
// Cirrus Logic International Semiconductor Ltd.
/*
* The MIPI SDCA specification is available for public downloads at
* https://www.mipi.org/mipi-sdca-v1-0-download
*/
#include <linux/bits.h>
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
#include <sound/sdca.h>
#include <sound/sdca_function.h>
#include <sound/sdca_interrupts.h>
#include <sound/soc-component.h>
#define IRQ_SDCA(number) REGMAP_IRQ_REG(number, ((number) / BITS_PER_BYTE), \
SDW_SCP_SDCA_INTMASK_SDCA_##number)
static const struct regmap_irq regmap_irqs[SDCA_MAX_INTERRUPTS] = {
IRQ_SDCA(0),
IRQ_SDCA(1),
IRQ_SDCA(2),
IRQ_SDCA(3),
IRQ_SDCA(4),
IRQ_SDCA(5),
IRQ_SDCA(6),
IRQ_SDCA(7),
IRQ_SDCA(8),
IRQ_SDCA(9),
IRQ_SDCA(10),
IRQ_SDCA(11),
IRQ_SDCA(12),
IRQ_SDCA(13),
IRQ_SDCA(14),
IRQ_SDCA(15),
IRQ_SDCA(16),
IRQ_SDCA(17),
IRQ_SDCA(18),
IRQ_SDCA(19),
IRQ_SDCA(20),
IRQ_SDCA(21),
IRQ_SDCA(22),
IRQ_SDCA(23),
IRQ_SDCA(24),
IRQ_SDCA(25),
IRQ_SDCA(26),
IRQ_SDCA(27),
IRQ_SDCA(28),
IRQ_SDCA(29),
IRQ_SDCA(30),
};
static const struct regmap_irq_chip sdca_irq_chip = {
.name = "sdca_irq",
.status_base = SDW_SCP_SDCA_INT1,
.unmask_base = SDW_SCP_SDCA_INTMASK1,
.ack_base = SDW_SCP_SDCA_INT1,
.num_regs = 4,
.irqs = regmap_irqs,
.num_irqs = SDCA_MAX_INTERRUPTS,
.runtime_pm = true,
};
static irqreturn_t base_handler(int irq, void *data)
{
struct sdca_interrupt *interrupt = data;
struct device *dev = interrupt->component->dev;
dev_info(dev, "%s irq without full handling\n", interrupt->name);
return IRQ_HANDLED;
}
static int sdca_irq_request_locked(struct device *dev,
struct sdca_interrupt_info *info,
int sdca_irq, const char *name,
irq_handler_t handler, void *data)
{
int irq;
int ret;
irq = regmap_irq_get_virq(info->irq_data, sdca_irq);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL, handler,
IRQF_ONESHOT, name, data);
if (ret)
return ret;
dev_dbg(dev, "requested irq %d for %s\n", irq, name);
return 0;
}
/**
* sdca_request_irq - request an individual SDCA interrupt
* @dev: Pointer to the struct device against which things should be allocated.
* @interrupt_info: Pointer to the interrupt information structure.
* @sdca_irq: SDCA interrupt position.
* @name: Name to be given to the IRQ.
* @handler: A callback thread function to be called for the IRQ.
* @data: Private data pointer that will be passed to the handler.
*
* Typically this is handled internally by sdca_irq_populate, however if
* a device requires custom IRQ handling this can be called manually before
* calling sdca_irq_populate, which will then skip that IRQ whilst processing.
*
* Return: Zero on success, and a negative error code on failure.
*/
int sdca_irq_request(struct device *dev, struct sdca_interrupt_info *info,
int sdca_irq, const char *name, irq_handler_t handler,
void *data)
{
int ret;
if (sdca_irq < 0 || sdca_irq > SDCA_MAX_INTERRUPTS) {
dev_err(dev, "bad irq request: %d\n", sdca_irq);
return -EINVAL;
}
guard(mutex)(&info->irq_lock);
ret = sdca_irq_request_locked(dev, info, sdca_irq, name, handler, data);
if (ret) {
dev_err(dev, "failed to request irq %s: %d\n", name, ret);
return ret;
}
info->irqs[sdca_irq].externally_requested = true;
return 0;
}
EXPORT_SYMBOL_NS_GPL(sdca_irq_request, "SND_SOC_SDCA_IRQ");
/**
* sdca_irq_data_populate - Populate common interrupt data
* @component: Pointer to the ASoC component for the Function.
* @function: Pointer to the SDCA Function.
* @entity: Pointer to the SDCA Entity.
* @control: Pointer to the SDCA Control.
* @interrupt: Pointer to the SDCA interrupt for this IRQ.
*
* Return: Zero on success, and a negative error code on failure.
*/
int sdca_irq_data_populate(struct snd_soc_component *component,
struct sdca_function_data *function,
struct sdca_entity *entity,
struct sdca_control *control,
struct sdca_interrupt *interrupt)
{
struct device *dev = component->dev;
const char *name;
name = devm_kasprintf(dev, GFP_KERNEL, "%s %s %s", function->desc->name,
entity->label, control->label);
if (!name)
return -ENOMEM;
interrupt->name = name;
interrupt->component = component;
interrupt->function = function;
interrupt->entity = entity;
interrupt->control = control;
return 0;
}
EXPORT_SYMBOL_NS_GPL(sdca_irq_data_populate, "SND_SOC_SDCA_IRQ");
/**
* sdca_irq_populate - Request all the individual IRQs for an SDCA Function
* @function: Pointer to the SDCA Function.
* @component: Pointer to the ASoC component for the Function.
* @info: Pointer to the SDCA interrupt info for this device.
*
* Typically this would be called from the driver for a single SDCA Function.
*
* Return: Zero on success, and a negative error code on failure.
*/
int sdca_irq_populate(struct sdca_function_data *function,
struct snd_soc_component *component,
struct sdca_interrupt_info *info)
{
struct device *dev = component->dev;
int i, j;
guard(mutex)(&info->irq_lock);
for (i = 0; i < function->num_entities; i++) {
struct sdca_entity *entity = &function->entities[i];
for (j = 0; j < entity->num_controls; j++) {
struct sdca_control *control = &entity->controls[j];
int irq = control->interrupt_position;
struct sdca_interrupt *interrupt;
const char *name;
int ret;
if (irq == SDCA_NO_INTERRUPT) {
continue;
} else if (irq < 0 || irq >= SDCA_MAX_INTERRUPTS) {
dev_err(dev, "bad irq position: %d\n", irq);
return -EINVAL;
}
interrupt = &info->irqs[irq];
if (interrupt->externally_requested) {
dev_dbg(dev,
"skipping irq %d, externally requested\n",
irq);
continue;
}
ret = sdca_irq_data_populate(component, function, entity,
control, interrupt);
if (ret)
return ret;
ret = sdca_irq_request_locked(dev, info, irq, interrupt->name,
base_handler, interrupt);
if (ret) {
dev_err(dev, "failed to request irq %s: %d\n",
name, ret);
return ret;
}
}
}
return 0;
}
EXPORT_SYMBOL_NS_GPL(sdca_irq_populate, "SND_SOC_SDCA_IRQ");
/**
* sdca_irq_allocate - allocate an SDCA interrupt structure for a device
* @dev: Device pointer against which things should be allocated.
* @regmap: regmap to be used for accessing the SDCA IRQ registers.
* @irq: The interrupt number.
*
* Typically this would be called from the top level driver for the whole
* SDCA device, as only a single instance is required across all Functions
* on the device.
*
* Return: A pointer to the allocated sdca_interrupt_info struct, or an
* error code.
*/
struct sdca_interrupt_info *sdca_irq_allocate(struct device *dev,
struct regmap *regmap, int irq)
{
struct sdca_interrupt_info *info;
int ret;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return ERR_PTR(-ENOMEM);
info->irq_chip = sdca_irq_chip;
devm_mutex_init(dev, &info->irq_lock);
ret = devm_regmap_add_irq_chip(dev, regmap, irq, IRQF_ONESHOT, 0,
&info->irq_chip, &info->irq_data);
if (ret) {
dev_err(dev, "failed to register irq chip: %d\n", ret);
return ERR_PTR(ret);
}
dev_dbg(dev, "registered on irq %d\n", irq);
return info;
}
EXPORT_SYMBOL_NS_GPL(sdca_irq_allocate, "SND_SOC_SDCA_IRQ");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SDCA IRQ library");