linux/sound/soc/codecs/cs35l45-spi.c
Vlad.Karpovich 6c07be8fe9
ASoC: cs35l45: Hibernation support
Adds support for a low-power Hibernation State.
Add support for a low-power hibernation state for the DSP. In
this state the DSP RAM contents are maintained, such that
firmware does not need to be re-downloaded, but the rest of the
chip's register state is lost.
Entry to this state is achieved via the register interface
(either by an external driver using the control port, or the
programmable DSP). Exit from this state is triggered by activity
on device GPIO pins, intended SPI transaction, or I2C
transaction with intended slave address.

Signed-off-by: Vlad Karpovich <vkarpovi@opensource.cirrus.com>
Link: https://lore.kernel.org/r/167933511185.26.10641185496218226278@mailman-core.alsa-project.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-03-21 12:46:42 +00:00

79 lines
1.8 KiB
C

// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
//
// cs35l45-spi.c -- CS35L45 SPI driver
//
// Copyright 2019-2022 Cirrus Logic, Inc.
//
// Author: James Schulman <james.schulman@cirrus.com>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include "cs35l45.h"
static int cs35l45_spi_probe(struct spi_device *spi)
{
struct cs35l45_private *cs35l45;
struct device *dev = &spi->dev;
int ret;
cs35l45 = devm_kzalloc(dev, sizeof(struct cs35l45_private), GFP_KERNEL);
if (cs35l45 == NULL)
return -ENOMEM;
spi->max_speed_hz = CS35L45_SPI_MAX_FREQ;
spi_setup(spi);
spi_set_drvdata(spi, cs35l45);
cs35l45->regmap = devm_regmap_init_spi(spi, &cs35l45_spi_regmap);
if (IS_ERR(cs35l45->regmap)) {
ret = PTR_ERR(cs35l45->regmap);
dev_err(dev, "Failed to allocate register map: %d\n", ret);
return ret;
}
cs35l45->dev = dev;
cs35l45->irq = spi->irq;
cs35l45->bus_type = CONTROL_BUS_SPI;
return cs35l45_probe(cs35l45);
}
static void cs35l45_spi_remove(struct spi_device *spi)
{
struct cs35l45_private *cs35l45 = spi_get_drvdata(spi);
cs35l45_remove(cs35l45);
}
static const struct of_device_id cs35l45_of_match[] = {
{ .compatible = "cirrus,cs35l45" },
{},
};
MODULE_DEVICE_TABLE(of, cs35l45_of_match);
static const struct spi_device_id cs35l45_id_spi[] = {
{ "cs35l45", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, cs35l45_id_spi);
static struct spi_driver cs35l45_spi_driver = {
.driver = {
.name = "cs35l45",
.of_match_table = cs35l45_of_match,
.pm = &cs35l45_pm_ops,
},
.id_table = cs35l45_id_spi,
.probe = cs35l45_spi_probe,
.remove = cs35l45_spi_remove,
};
module_spi_driver(cs35l45_spi_driver);
MODULE_DESCRIPTION("SPI CS35L45 driver");
MODULE_AUTHOR("James Schulman, Cirrus Logic Inc, <james.schulman@cirrus.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_IMPORT_NS(SND_SOC_CS35L45);