diff options
Diffstat (limited to 'sound/soc/codecs/cs35l41-spi.c')
| -rw-r--r-- | sound/soc/codecs/cs35l41-spi.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sound/soc/codecs/cs35l41-spi.c b/sound/soc/codecs/cs35l41-spi.c new file mode 100644 index 000000000000..e253c6d82ce8 --- /dev/null +++ b/sound/soc/codecs/cs35l41-spi.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// cs35l41-spi.c -- CS35l41 SPI driver +// +// Copyright 2017-2021 Cirrus Logic, Inc. +// +// Author: David Rhodes <david.rhodes@cirrus.com> + +#include <linux/acpi.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> + +#include <sound/cs35l41.h> +#include "cs35l41.h" + +static struct regmap_config cs35l41_regmap_spi = { + .reg_bits = 32, + .val_bits = 32, + .pad_bits = 16, + .reg_stride = CS35L41_REGSTRIDE, + .reg_format_endian = REGMAP_ENDIAN_BIG, + .val_format_endian = REGMAP_ENDIAN_BIG, + .max_register = CS35L41_LASTREG, + .reg_defaults = cs35l41_reg, + .num_reg_defaults = ARRAY_SIZE(cs35l41_reg), + .volatile_reg = cs35l41_volatile_reg, + .readable_reg = cs35l41_readable_reg, + .precious_reg = cs35l41_precious_reg, + .cache_type = REGCACHE_RBTREE, +}; + +static const struct spi_device_id cs35l41_id_spi[] = { + { "cs35l40", 0 }, + { "cs35l41", 0 }, + {} +}; + +MODULE_DEVICE_TABLE(spi, cs35l41_id_spi); + +static void cs35l41_spi_otp_setup(struct cs35l41_private *cs35l41, + bool is_pre_setup, unsigned int *freq) +{ + struct spi_device *spi; + u32 orig_spi_freq; + + spi = to_spi_device(cs35l41->dev); + + if (!spi) { + dev_err(cs35l41->dev, "%s: No SPI device\n", __func__); + return; + } + + if (is_pre_setup) { + orig_spi_freq = spi->max_speed_hz; + if (orig_spi_freq > CS35L41_SPI_MAX_FREQ_OTP) { + spi->max_speed_hz = CS35L41_SPI_MAX_FREQ_OTP; + spi_setup(spi); + } + *freq = orig_spi_freq; + } else { + if (spi->max_speed_hz != *freq) { + spi->max_speed_hz = *freq; + spi_setup(spi); + } + } +} + +static int cs35l41_spi_probe(struct spi_device *spi) +{ + const struct regmap_config *regmap_config = &cs35l41_regmap_spi; + struct cs35l41_platform_data *pdata = + dev_get_platdata(&spi->dev); + struct cs35l41_private *cs35l41; + int ret; + + cs35l41 = devm_kzalloc(&spi->dev, + sizeof(struct cs35l41_private), + GFP_KERNEL); + if (!cs35l41) + return -ENOMEM; + + + spi_set_drvdata(spi, cs35l41); + cs35l41->regmap = devm_regmap_init_spi(spi, regmap_config); + if (IS_ERR(cs35l41->regmap)) { + ret = PTR_ERR(cs35l41->regmap); + dev_err(&spi->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + cs35l41->dev = &spi->dev; + cs35l41->irq = spi->irq; + cs35l41->otp_setup = cs35l41_spi_otp_setup; + + return cs35l41_probe(cs35l41, pdata); +} + +static int cs35l41_spi_remove(struct spi_device *spi) +{ + struct cs35l41_private *cs35l41 = spi_get_drvdata(spi); + + return cs35l41_remove(cs35l41); +} + +#ifdef CONFIG_OF +static const struct of_device_id cs35l41_of_match[] = { + { .compatible = "cirrus,cs35l40" }, + { .compatible = "cirrus,cs35l41" }, + {}, +}; +MODULE_DEVICE_TABLE(of, cs35l41_of_match); +#endif + +#ifdef CONFIG_ACPI +static const struct acpi_device_id cs35l41_acpi_match[] = { + { "CSC3541", 0 }, /* Cirrus Logic PnP ID + part ID */ + {}, +}; +MODULE_DEVICE_TABLE(acpi, cs35l41_acpi_match); +#endif + +static struct spi_driver cs35l41_spi_driver = { + .driver = { + .name = "cs35l41", + .of_match_table = of_match_ptr(cs35l41_of_match), + .acpi_match_table = ACPI_PTR(cs35l41_acpi_match), + }, + .id_table = cs35l41_id_spi, + .probe = cs35l41_spi_probe, + .remove = cs35l41_spi_remove, +}; + +module_spi_driver(cs35l41_spi_driver); + +MODULE_DESCRIPTION("SPI CS35L41 driver"); +MODULE_AUTHOR("David Rhodes, Cirrus Logic Inc, <david.rhodes@cirrus.com>"); +MODULE_LICENSE("GPL"); |