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-rw-r--r--include/sound/i2c.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/include/sound/i2c.h b/include/sound/i2c.h
new file mode 100644
index 000000000..6f0162ae9
--- /dev/null
+++ b/include/sound/i2c.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __SOUND_I2C_H
+#define __SOUND_I2C_H
+
+/*
+ */
+
+#define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */
+
+struct snd_i2c_device {
+ struct list_head list;
+ struct snd_i2c_bus *bus; /* I2C bus */
+ char name[32]; /* some useful device name */
+ unsigned short flags; /* device flags */
+ unsigned short addr; /* device address (might be 10-bit) */
+ unsigned long private_value;
+ void *private_data;
+ void (*private_free)(struct snd_i2c_device *device);
+};
+
+#define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list)
+
+struct snd_i2c_bit_ops {
+ void (*start)(struct snd_i2c_bus *bus); /* transfer start */
+ void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */
+ void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */
+ void (*setlines)(struct snd_i2c_bus *bus, int clock, int data);
+ int (*getclock)(struct snd_i2c_bus *bus);
+ int (*getdata)(struct snd_i2c_bus *bus, int ack);
+};
+
+struct snd_i2c_ops {
+ int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
+ int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count);
+ int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr);
+};
+
+struct snd_i2c_bus {
+ struct snd_card *card; /* card which I2C belongs to */
+ char name[32]; /* some useful label */
+
+ struct mutex lock_mutex;
+
+ struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */
+ struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */
+
+ struct list_head devices; /* attached devices to this bus */
+
+ union {
+ struct snd_i2c_bit_ops *bit;
+ void *ops;
+ } hw_ops; /* lowlevel operations */
+ const struct snd_i2c_ops *ops; /* midlevel operations */
+
+ unsigned long private_value;
+ void *private_data;
+ void (*private_free)(struct snd_i2c_bus *bus);
+};
+
+#define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses)
+
+int snd_i2c_bus_create(struct snd_card *card, const char *name,
+ struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c);
+int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name,
+ unsigned char addr, struct snd_i2c_device **rdevice);
+int snd_i2c_device_free(struct snd_i2c_device *device);
+
+static inline void snd_i2c_lock(struct snd_i2c_bus *bus)
+{
+ if (bus->master)
+ mutex_lock(&bus->master->lock_mutex);
+ else
+ mutex_lock(&bus->lock_mutex);
+}
+
+static inline void snd_i2c_unlock(struct snd_i2c_bus *bus)
+{
+ if (bus->master)
+ mutex_unlock(&bus->master->lock_mutex);
+ else
+ mutex_unlock(&bus->lock_mutex);
+}
+
+int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
+int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count);
+int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr);
+
+#endif /* __SOUND_I2C_H */