/* * soc-io.c -- ASoC register I/O helpers * * Copyright 2009-2011 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/i2c.h> #include <linux/spi/spi.h> #include <linux/regmap.h> #include <linux/export.h> #include <sound/soc.h> #include <trace/events/asoc.h> #ifdef CONFIG_REGMAP static int hw_write(struct snd_soc_codec *codec, unsigned int reg, unsigned int value) { int ret; if (!snd_soc_codec_volatile_register(codec, reg) && reg < codec->driver->reg_cache_size && !codec->cache_bypass) { ret = snd_soc_cache_write(codec, reg, value); if (ret < 0) return -1; } if (codec->cache_only) { codec->cache_sync = 1; return 0; } return regmap_write(codec->control_data, reg, value); } static unsigned int hw_read(struct snd_soc_codec *codec, unsigned int reg) { int ret; unsigned int val; if (reg >= codec->driver->reg_cache_size || snd_soc_codec_volatile_register(codec, reg) || codec->cache_bypass) { if (codec->cache_only) return -1; ret = regmap_read(codec->control_data, reg, &val); if (ret == 0) return val; else return -1; } ret = snd_soc_cache_read(codec, reg, &val); if (ret < 0) return -1; return val; } /* Primitive bulk write support for soc-cache. The data pointed to by * `data' needs to already be in the form the hardware expects. Any * data written through this function will not go through the cache as * it only handles writing to volatile or out of bounds registers. * * This is currently only supported for devices using the regmap API * wrappers. */ static int snd_soc_hw_bulk_write_raw(struct snd_soc_codec *codec, unsigned int reg, const void *data, size_t len) { /* To ensure that we don't get out of sync with the cache, check * whether the base register is volatile or if we've directly asked * to bypass the cache. Out of bounds registers are considered * volatile. */ if (!codec->cache_bypass && !snd_soc_codec_volatile_register(codec, reg) && reg < codec->driver->reg_cache_size) return -EINVAL; return regmap_raw_write(codec->control_data, reg, data, len); } /** * snd_soc_codec_set_cache_io: Set up standard I/O functions. * * @codec: CODEC to configure. * @addr_bits: Number of bits of register address data. * @data_bits: Number of bits of data per register. * @control: Control bus used. * * Register formats are frequently shared between many I2C and SPI * devices. In order to promote code reuse the ASoC core provides * some standard implementations of CODEC read and write operations * which can be set up using this function. * * The caller is responsible for allocating and initialising the * actual cache. * * Note that at present this code cannot be used by CODECs with * volatile registers. */ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, int addr_bits, int data_bits, enum snd_soc_control_type control) { struct regmap_config config; int ret; memset(&config, 0, sizeof(config)); codec->write = hw_write; codec->read = hw_read; codec->bulk_write_raw = snd_soc_hw_bulk_write_raw; config.reg_bits = addr_bits; config.val_bits = data_bits; switch (control) { #if defined(CONFIG_REGMAP_I2C) || defined(CONFIG_REGMAP_I2C_MODULE) case SND_SOC_I2C: codec->control_data = regmap_init_i2c(to_i2c_client(codec->dev), &config); break; #endif #if defined(CONFIG_REGMAP_SPI) || defined(CONFIG_REGMAP_SPI_MODULE) case SND_SOC_SPI: codec->control_data = regmap_init_spi(to_spi_device(codec->dev), &config); break; #endif case SND_SOC_REGMAP: /* Device has made its own regmap arrangements */ codec->using_regmap = true; if (!codec->control_data) codec->control_data = dev_get_regmap(codec->dev, NULL); if (codec->control_data) { ret = regmap_get_val_bytes(codec->control_data); /* Errors are legitimate for non-integer byte * multiples */ if (ret > 0) codec->val_bytes = ret; } break; default: return -EINVAL; } if (IS_ERR(codec->control_data)) return PTR_ERR(codec->control_data); return 0; } EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io); #else int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, int addr_bits, int data_bits, enum snd_soc_control_type control) { return -ENOTSUPP; } EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io); #endif