diff options
| author | Vinod Koul <vinod.koul@intel.com> | 2017-12-14 11:19:37 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-19 11:14:57 +0100 |
| commit | 9d715fa005ebccc510a430df278665793528e31f (patch) | |
| tree | bdc0f9452a392cdbd2a4a93eb9d1ffe550ebaaea /drivers/soundwire/bus.h | |
| parent | 6f3da1f3881c8f2fd7e06cff54a2437399528b4a (diff) | |
soundwire: Add IO transfer
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>
Diffstat (limited to 'drivers/soundwire/bus.h')
| -rw-r--r-- | drivers/soundwire/bus.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index a54921825ce0..48eb7de8db7b 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -16,4 +16,40 @@ static inline int sdw_acpi_find_slaves(struct sdw_bus *bus) void sdw_extract_slave_id(struct sdw_bus *bus, u64 addr, struct sdw_slave_id *id); +enum { + SDW_MSG_FLAG_READ = 0, + SDW_MSG_FLAG_WRITE, +}; + +/** + * struct sdw_msg - Message structure + * @addr: Register address accessed in the Slave + * @len: number of messages + * @dev_num: Slave device number + * @addr_page1: SCP address page 1 Slave register + * @addr_page2: SCP address page 2 Slave register + * @flags: transfer flags, indicate if xfer is read or write + * @buf: message data buffer + * @ssp_sync: Send message at SSP (Stream Synchronization Point) + * @page: address requires paging + */ +struct sdw_msg { + u16 addr; + u16 len; + u8 dev_num; + u8 addr_page1; + u8 addr_page2; + u8 flags; + u8 *buf; + bool ssp_sync; + bool page; +}; + +int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg); +int sdw_transfer_defer(struct sdw_bus *bus, struct sdw_msg *msg, + struct sdw_defer *defer); + +int sdw_fill_msg(struct sdw_msg *msg, struct sdw_slave *slave, + u32 addr, size_t count, u16 dev_num, u8 flags, u8 *buf); + #endif /* __SDW_BUS_H */ |