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slimbus.h
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2011-2017, The Linux Foundation */ #ifndef _LINUX_SLIMBUS_H #define _LINUX_SLIMBUS_H #include <linux/device.h> #include <linux/module.h> #include <linux/completion.h> #include <linux/mod_devicetable.h> extern struct bus_type slimbus_bus; /** * struct slim_eaddr - Enumeration address for a SLIMbus device * @instance: Instance value * @dev_index: Device index * @prod_code: Product code * @manf_id: Manufacturer Id for the device */ struct slim_eaddr { u8 instance; u8 dev_index; u16 prod_code; u16 manf_id; } __packed; /** * enum slim_device_status - slim device status * @SLIM_DEVICE_STATUS_DOWN: Slim device is absent or not reported yet. * @SLIM_DEVICE_STATUS_UP: Slim device is announced on the bus. * @SLIM_DEVICE_STATUS_RESERVED: Reserved for future use. */ enum slim_device_status { SLIM_DEVICE_STATUS_DOWN = 0, SLIM_DEVICE_STATUS_UP, SLIM_DEVICE_STATUS_RESERVED, }; struct slim_controller; /** * struct slim_device - Slim device handle. * @dev: Driver model representation of the device. * @e_addr: Enumeration address of this device. * @status: slim device status * @ctrl: slim controller instance. * @laddr: 1-byte Logical address of this device. * @is_laddr_valid: indicates if the laddr is valid or not * @stream_list: List of streams on this device * @stream_list_lock: lock to protect the stream list * * This is the client/device handle returned when a SLIMbus * device is registered with a controller. * Pointer to this structure is used by client-driver as a handle. */ struct slim_device { struct device dev; struct slim_eaddr e_addr; struct slim_controller *ctrl; enum slim_device_status status; u8 laddr; bool is_laddr_valid; struct list_head stream_list; spinlock_t stream_list_lock; }; #define to_slim_device(d) container_of(d, struct slim_device, dev) /** * struct slim_driver - SLIMbus 'generic device' (slave) device driver * (similar to 'spi_device' on SPI) * @probe: Binds this driver to a SLIMbus device. * @remove: Unbinds this driver from the SLIMbus device. * @shutdown: Standard shutdown callback used during powerdown/halt. * @device_status: This callback is called when * - The device reports present and gets a laddr assigned * - The device reports absent, or the bus goes down. * @driver: SLIMbus device drivers should initialize name and owner field of * this structure * @id_table: List of SLIMbus devices supported by this driver */ struct slim_driver { int (*probe)(struct slim_device *sl); void (*remove)(struct slim_device *sl); void (*shutdown)(struct slim_device *sl); int (*device_status)(struct slim_device *sl, enum slim_device_status s); struct device_driver driver; const struct slim_device_id *id_table; }; #define to_slim_driver(d) container_of(d, struct slim_driver, driver) /** * struct slim_val_inf - Slimbus value or information element * @start_offset: Specifies starting offset in information/value element map * @rbuf: buffer to read the values * @wbuf: buffer to write * @num_bytes: upto 16. This ensures that the message will fit the slicesize * per SLIMbus spec * @comp: completion for asynchronous operations, valid only if TID is * required for transaction, like REQUEST operations. * Rest of the transactions are synchronous anyway. */ struct slim_val_inf { u16 start_offset; u8 num_bytes; u8 *rbuf; const u8 *wbuf; struct completion *comp; }; #define SLIM_DEVICE_MAX_CHANNELS 256 /* A SLIMBus Device may have frmo 0 to 31 Ports (inclusive) */ #define SLIM_DEVICE_MAX_PORTS 32 /** * struct slim_stream_config - SLIMbus stream configuration * Configuring a stream is done at hw_params or prepare call * from audio drivers where they have all the required information * regarding rate, number of channels and so on. * There is a 1:1 mapping of channel and ports. * * @rate: data rate * @bps: bits per data sample * @ch_count: number of channels * @chs: pointer to list of channel numbers * @port_mask: port mask of ports to use for this stream * @direction: direction of the stream, SNDRV_PCM_STREAM_PLAYBACK * or SNDRV_PCM_STREAM_CAPTURE. */ struct slim_stream_config { unsigned int rate; unsigned int bps; /* MAX 256 channels */ unsigned int ch_count; unsigned int *chs; /* Max 32 ports per device */ unsigned long port_mask; int direction; }; /* * use a macro to avoid include chaining to get THIS_MODULE */ #define slim_driver_register(drv) \ __slim_driver_register(drv, THIS_MODULE) int __slim_driver_register(struct slim_driver *drv, struct module *owner); void slim_driver_unregister(struct slim_driver *drv); /** * module_slim_driver() - Helper macro for registering a SLIMbus driver * @__slim_driver: slimbus_driver struct * * Helper macro for SLIMbus drivers which do not do anything special in module * init/exit. This eliminates a lot of boilerplate. Each module may only * use this macro once, and calling it replaces module_init() and module_exit() */ #define module_slim_driver(__slim_driver) \ module_driver(__slim_driver, slim_driver_register, \ slim_driver_unregister) static inline void *slim_get_devicedata(const struct slim_device *dev) { return dev_get_drvdata(&dev->dev); } static inline void slim_set_devicedata(struct slim_device *dev, void *data) { dev_set_drvdata(&dev->dev, data); } struct slim_device *of_slim_get_device(struct slim_controller *ctrl, struct device_node *np); struct slim_device *slim_get_device(struct slim_controller *ctrl, struct slim_eaddr *e_addr); int slim_get_logical_addr(struct slim_device *sbdev); /* Information Element management messages */ #define SLIM_MSG_MC_REQUEST_INFORMATION 0x20 #define SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION 0x21 #define SLIM_MSG_MC_REPLY_INFORMATION 0x24 #define SLIM_MSG_MC_CLEAR_INFORMATION 0x28 #define SLIM_MSG_MC_REPORT_INFORMATION 0x29 /* Value Element management messages */ #define SLIM_MSG_MC_REQUEST_VALUE 0x60 #define SLIM_MSG_MC_REQUEST_CHANGE_VALUE 0x61 #define SLIM_MSG_MC_REPLY_VALUE 0x64 #define SLIM_MSG_MC_CHANGE_VALUE 0x68 int slim_xfer_msg(struct slim_device *sbdev, struct slim_val_inf *msg, u8 mc); int slim_readb(struct slim_device *sdev, u32 addr); int slim_writeb(struct slim_device *sdev, u32 addr, u8 value); int slim_read(struct slim_device *sdev, u32 addr, size_t count, u8 *val); int slim_write(struct slim_device *sdev, u32 addr, size_t count, u8 *val); /* SLIMbus Stream apis */ struct slim_stream_runtime; struct slim_stream_runtime *slim_stream_allocate(struct slim_device *dev, const char *sname); int slim_stream_prepare(struct slim_stream_runtime *stream, struct slim_stream_config *c); int slim_stream_enable(struct slim_stream_runtime *stream); int slim_stream_disable(struct slim_stream_runtime *stream); int slim_stream_unprepare(struct slim_stream_runtime *stream); int slim_stream_free(struct slim_stream_runtime *stream); #endif /* _LINUX_SLIMBUS_H */
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