308 lines
10 KiB
C
308 lines
10 KiB
C
/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_SOUNDWIRE_H
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#define _LINUX_SOUNDWIRE_H
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/mod_devicetable.h>
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extern struct bus_type soundwire_type;
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/* Soundwire supports max. of 8 channels per port */
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#define SWR_MAX_CHANNEL_NUM 8
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/* Soundwire supports max. of 14 ports on each device */
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#define SWR_MAX_DEV_PORT_NUM 14
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/* Maximum number of slave devices that a master can control */
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#define SWR_MAX_DEV_NUM 11
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/* Maximum number of ports on master so that it can accomodate all the port
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* configurations of all devices
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*/
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#define SWR_MAX_MSTR_PORT_NUM (SWR_MAX_DEV_NUM * SWR_MAX_DEV_PORT_NUM)
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/* Indicates soundwire devices group information */
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enum {
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SWR_GROUP_NONE = 0,
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SWR_GROUP_12 = 12,
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SWR_GROUP_13 = 13,
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SWR_BROADCAST = 15,
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};
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/*
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* struct swr_port_info - represent soundwire frame shape
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* @dev_id: logical device number of the soundwire slave device
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* @port_en: flag indicates whether the port is enabled
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* @port_id: logical port number of the soundwire slave device
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* @offset1: sample offset indicating the offset of the channel
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* from the start of the frame
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* @offset2: channel offset indicating offset between to channels
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* @sinterval: sample interval indicates spacing from one sample
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* event to the next
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* @ch_en: channels in a port that need to be enabled
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* @num_ch: number of channels enabled in a port
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* @ch_rate: sampling rate of the channel with which data will be
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* transferred
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*
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* Soundwire frame shape is created based on swr_port_info struct
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* parameters.
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*/
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struct swr_port_info {
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u8 dev_id;
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u8 port_en;
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u8 port_id;
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u8 offset1;
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u8 offset2;
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u8 sinterval;
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u8 ch_en;
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u8 num_ch;
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u32 ch_rate;
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};
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/*
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* struct swr_params - represent transfer of data from soundwire slave
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* to soundwire master
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* @tid: transaction ID to track each transaction
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* @dev_id: logical device number of the soundwire slave device
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* @num_port: number of ports that needs to be configured
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* @port_id: array of logical port numbers of the soundwire slave device
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* @num_ch: array of number of channels enabled
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* @ch_rate: array of sampling rate of different channels that need to
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* be configured
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* @ch_en: array of channels mask for all the ports
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*/
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struct swr_params {
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u8 tid;
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u8 dev_id;
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u8 num_port;
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u8 port_id[SWR_MAX_DEV_PORT_NUM];
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u8 num_ch[SWR_MAX_DEV_PORT_NUM];
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u32 ch_rate[SWR_MAX_DEV_PORT_NUM];
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u8 ch_en[SWR_MAX_DEV_PORT_NUM];
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};
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/*
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* struct swr_reg - struct to handle soundwire slave register read/writes
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* @tid: transaction id for reg read/writes
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* @dev_id: logical device number of the soundwire slave device
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* @regaddr: 16 bit regaddr of soundwire slave
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* @buf: value to be written/read to/from regaddr
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* @len: length of the buffer buf
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*/
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struct swr_reg {
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u8 tid;
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u8 dev_id;
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u32 regaddr;
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u32 *buf;
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u32 len;
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};
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/*
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* struct swr_master - Interface to the soundwire master controller
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* @dev: device interface to this driver
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* @list: link with other soundwire master controllers
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* @bus_num: board/SoC specific identifier for a soundwire master
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* @mlock: mutex protecting master data structures
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* @devices: list of devices on this master
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* @port: logical port numbers of the soundwire master. This array
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* can hold maximum master ports which is equal to number of slave
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* devices multiplied by number of ports in each slave device
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* @port_txn: table of port config transactions with transaction id
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* @reg_txn: table of register transactions with transaction id
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* @last_tid: size of table port_txn (can't grow beyond 256 since
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* tid is 8 bits)
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* @num_port: number of active ports on soundwire master
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* @gr_sid: slave id used by the group for write operations
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* @connect_port: callback for configuration of soundwire port(s)
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* @disconnect_port: callback for disable of soundwire port(s)
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* @read: callback for soundwire slave register read
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* @write: callback for soundwire slave register write
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* @get_logical_dev_num: callback to get soundwire slave logical
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* device number
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*/
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struct swr_master {
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struct device dev;
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struct list_head list;
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unsigned int bus_num;
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struct mutex mlock;
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struct list_head devices;
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struct swr_port_info port[SWR_MAX_MSTR_PORT_NUM];
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struct swr_params **port_txn;
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struct swr_reg **reg_txn;
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u8 last_tid;
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u8 num_port;
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u8 num_dev;
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u8 gr_sid;
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int (*connect_port)(struct swr_master *mstr, struct swr_params *txn);
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int (*disconnect_port)(struct swr_master *mstr, struct swr_params *txn);
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int (*read)(struct swr_master *mstr, u8 dev_num, u16 reg_addr,
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void *buf, u32 len);
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int (*write)(struct swr_master *mstr, u8 dev_num, u16 reg_addr,
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const void *buf);
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int (*bulk_write)(struct swr_master *master, u8 dev_num, void *reg,
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const void *buf, size_t len);
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int (*get_logical_dev_num)(struct swr_master *mstr, u64 dev_id,
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u8 *dev_num);
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};
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static inline struct swr_master *to_swr_master(struct device *dev)
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{
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return dev ? container_of(dev, struct swr_master, dev) : NULL;
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}
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/*
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* struct swr_device - represent a soundwire slave device
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* @name: indicates the name of the device, defined in devicetree
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* binding under soundwire slave device node as a compatible field.
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* @master: soundwire master managing the bus hosting this device
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* @driver: Device's driver. Pointer to access routines
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* @dev_list: list of devices on a controller
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* @dev_num: logical device number of the soundwire slave device
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* @dev: driver model representation of the device
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* @addr: represents "ea-addr" which is unique-id of soundwire slave
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* device
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* @group_id: group id supported by the slave device
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*/
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struct swr_device {
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char name[SOUNDWIRE_NAME_SIZE];
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struct swr_master *master;
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struct swr_driver *driver;
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struct list_head dev_list;
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u8 dev_num;
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struct device dev;
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unsigned long addr;
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u8 group_id;
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};
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static inline struct swr_device *to_swr_device(struct device *dev)
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{
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return dev ? container_of(dev, struct swr_device, dev) : NULL;
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}
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/*
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* struct swr_driver - Manage soundwire slave device driver
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* @probe: binds this driver to soundwire device
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* @remove: unbinds this driver from soundwire device
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* @shutdown: standard shutdown callback used during power down/halt
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* @suspend: standard suspend callback used during system suspend
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* @resume: standard resume callback used during system resume
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* @startup: additional init operation for slave devices
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* @driver: soundwire device drivers should initialize name and
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* owner field of this structure
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* @id_table: list of soundwire devices supported by this driver
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*/
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struct swr_driver {
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int (*probe)(struct swr_device *swr);
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int (*remove)(struct swr_device *swr);
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void (*shutdown)(struct swr_device *swr);
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int (*suspend)(struct swr_device *swr, pm_message_t pmesg);
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int (*resume)(struct swr_device *swr);
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int (*device_up)(struct swr_device *swr);
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int (*device_down)(struct swr_device *swr);
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int (*reset_device)(struct swr_device *swr);
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int (*startup)(struct swr_device *swr);
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struct device_driver driver;
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const struct swr_device_id *id_table;
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};
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static inline struct swr_driver *to_swr_driver(struct device_driver *drv)
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{
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return drv ? container_of(drv, struct swr_driver, driver) : NULL;
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}
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/*
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* struct swr_boardinfo - Declare board info for soundwire device bringup
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* @name: name to initialize swr_device.name
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* @bus_num: identifies which soundwire master parents the soundwire
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* slave_device
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* @addr: represents "ea-addr" of soundwire slave device
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* @of_node: pointer to OpenFirmware device node
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* @swr_slave: device to be registered with soundwire
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*/
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struct swr_boardinfo {
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char name[SOUNDWIRE_NAME_SIZE];
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int bus_num;
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u64 addr;
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struct device_node *of_node;
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struct swr_device *swr_slave;
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};
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static inline void *swr_get_ctrl_data(const struct swr_master *master)
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{
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return master ? dev_get_drvdata(&master->dev) : NULL;
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}
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static inline void swr_set_ctrl_data(struct swr_master *master, void *data)
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{
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dev_set_drvdata(&master->dev, data);
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}
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static inline void *swr_get_dev_data(const struct swr_device *dev)
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{
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return dev ? dev_get_drvdata(&dev->dev) : NULL;
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}
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static inline void swr_set_dev_data(struct swr_device *dev, void *data)
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{
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dev_set_drvdata(&dev->dev, data);
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}
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extern int swr_startup_devices(struct swr_device *swr_dev);
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extern struct swr_device *swr_new_device(struct swr_master *master,
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struct swr_boardinfo const *info);
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extern int of_register_swr_devices(struct swr_master *master);
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extern void swr_port_response(struct swr_master *mstr, u8 tid);
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extern int swr_get_logical_dev_num(struct swr_device *dev, u64 dev_id,
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u8 *dev_num);
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extern int swr_read(struct swr_device *dev, u8 dev_num, u16 reg_addr,
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void *buf, u32 len);
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extern int swr_write(struct swr_device *dev, u8 dev_num, u16 reg_addr,
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const void *buf);
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extern int swr_bulk_write(struct swr_device *dev, u8 dev_num, void *reg_addr,
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const void *buf, size_t len);
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extern int swr_connect_port(struct swr_device *dev, u8 *port_id, u8 num_port,
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u8 *ch_mask, u32 *ch_rate, u8 *num_ch);
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extern int swr_disconnect_port(struct swr_device *dev,
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u8 *port_id, u8 num_port);
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extern int swr_set_device_group(struct swr_device *swr_dev, u8 id);
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extern int swr_driver_register(struct swr_driver *drv);
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extern void swr_driver_unregister(struct swr_driver *drv);
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extern int swr_add_device(struct swr_master *master,
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struct swr_device *swrdev);
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extern void swr_remove_device(struct swr_device *swr);
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extern void swr_master_add_boarddevices(struct swr_master *master);
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extern void swr_unregister_master(struct swr_master *master);
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extern int swr_register_master(struct swr_master *master);
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extern int swr_device_up(struct swr_device *swr_dev);
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extern int swr_device_down(struct swr_device *swr_dev);
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extern int swr_reset_device(struct swr_device *swr_dev);
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#endif /* _LINUX_SOUNDWIRE_H */
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