9d715fa005
SoundWire bus supports read or write register(s) for SoundWire Slave device. sdw_read() and sdw_write() APIs are provided for single register read/write. sdw_nread() and sdw_nwrite() for operations on contiguous registers. Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// Copyright(c) 2015-17 Intel Corporation.
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#ifndef __SDW_BUS_H
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#define __SDW_BUS_H
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#if IS_ENABLED(CONFIG_ACPI)
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int sdw_acpi_find_slaves(struct sdw_bus *bus);
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#else
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static inline int sdw_acpi_find_slaves(struct sdw_bus *bus)
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{
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return -ENOTSUPP;
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}
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#endif
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void sdw_extract_slave_id(struct sdw_bus *bus,
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u64 addr, struct sdw_slave_id *id);
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enum {
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SDW_MSG_FLAG_READ = 0,
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SDW_MSG_FLAG_WRITE,
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};
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/**
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* struct sdw_msg - Message structure
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* @addr: Register address accessed in the Slave
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* @len: number of messages
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* @dev_num: Slave device number
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* @addr_page1: SCP address page 1 Slave register
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* @addr_page2: SCP address page 2 Slave register
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* @flags: transfer flags, indicate if xfer is read or write
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* @buf: message data buffer
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* @ssp_sync: Send message at SSP (Stream Synchronization Point)
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* @page: address requires paging
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*/
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struct sdw_msg {
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u16 addr;
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u16 len;
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u8 dev_num;
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u8 addr_page1;
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u8 addr_page2;
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u8 flags;
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u8 *buf;
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bool ssp_sync;
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bool page;
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};
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int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg);
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int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg,
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struct sdw_defer *defer);
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int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave,
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u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf);
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#endif /* __SDW_BUS_H */
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