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Based on 1 normalized pattern(s): 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 this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
89 lines
2.8 KiB
C
89 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef __SOUND_I2C_H
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#define __SOUND_I2C_H
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/*
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*/
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#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
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struct snd_i2c_device {
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struct list_head list;
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struct snd_i2c_bus *bus; /* I2C bus */
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char name[32]; /* some useful device name */
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unsigned short flags; /* device flags */
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unsigned short addr; /* device address (might be 10-bit) */
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unsigned long private_value;
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void *private_data;
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void (*private_free)(struct snd_i2c_device *device);
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};
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#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
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struct snd_i2c_bit_ops {
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void (*start)(struct snd_i2c_bus *bus); /* transfer start */
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void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
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void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
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void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
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int (*getclock)(struct snd_i2c_bus *bus);
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int (*getdata)(struct snd_i2c_bus *bus, int ack);
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};
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struct snd_i2c_ops {
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int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
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int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
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int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
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};
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struct snd_i2c_bus {
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struct snd_card *card; /* card which I2C belongs to */
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char name[32]; /* some useful label */
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struct mutex lock_mutex;
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struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
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struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
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struct list_head devices; /* attached devices to this bus */
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union {
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struct snd_i2c_bit_ops *bit;
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void *ops;
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} hw_ops; /* lowlevel operations */
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const struct snd_i2c_ops *ops; /* midlevel operations */
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unsigned long private_value;
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void *private_data;
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void (*private_free)(struct snd_i2c_bus *bus);
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};
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#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
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int snd_i2c_bus_create(struct snd_card *card, const char *name,
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struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
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int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
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unsigned char addr, struct snd_i2c_device **rdevice);
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int snd_i2c_device_free(struct snd_i2c_device *device);
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static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
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{
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if (bus->master)
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mutex_lock(&bus->master->lock_mutex);
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else
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mutex_lock(&bus->lock_mutex);
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}
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static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
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{
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if (bus->master)
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mutex_unlock(&bus->master->lock_mutex);
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else
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mutex_unlock(&bus->lock_mutex);
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}
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int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
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int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
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int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
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#endif /* __SOUND_I2C_H */
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