1 files changed, 102 insertions, 0 deletions

diff --git a/include/sound/i2c.h b/include/sound/i2c.h
new file mode 100644
index 000000000000..a665ddf9c146
--- /dev/null
+++ b/include/sound/i2c.h
@@ -0,0 +1,102 @@
+#ifndef __SOUND_I2C_H
+#define __SOUND_I2C_H
+
+/*
+ *
+ *
+ *   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
+ *
+ *
+ */
+
+typedef struct _snd_i2c_device snd_i2c_device_t;
+typedef struct _snd_i2c_bus snd_i2c_bus_t;
+
+#define SND_I2C_DEVICE_ADDRTEN  (1<<0)  /* 10-bit I2C address */
+
+struct _snd_i2c_device {
+        struct list_head list;
+        snd_i2c_bus_t *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)(snd_i2c_device_t *device);
+};
+
+#define snd_i2c_device(n) list_entry(n, snd_i2c_device_t, list)
+
+typedef struct _snd_i2c_bit_ops {
+        void (*start)(snd_i2c_bus_t *bus);      /* transfer start */
+        void (*stop)(snd_i2c_bus_t *bus);       /* transfer stop */
+        void (*direction)(snd_i2c_bus_t *bus, int clock, int data);  /* set line direction (0 = write, 1 = read) */
+        void (*setlines)(snd_i2c_bus_t *bus, int clock, int data);
+        int (*getclock)(snd_i2c_bus_t *bus);
+        int (*getdata)(snd_i2c_bus_t *bus, int ack);
+} snd_i2c_bit_ops_t;
+
+typedef struct _snd_i2c_ops {
+        int (*sendbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
+        int (*readbytes)(snd_i2c_device_t *device, unsigned char *bytes, int count);
+        int (*probeaddr)(snd_i2c_bus_t *bus, unsigned short addr);
+} snd_i2c_ops_t;
+
+struct _snd_i2c_bus {
+        snd_card_t *card;       /* card which I2C belongs to */
+        char name[32];          /* some useful label */
+
+        struct semaphore lock_mutex;
+
+        snd_i2c_bus_t *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 {
+                snd_i2c_bit_ops_t *bit;
+                void *ops;
+        } hw_ops;               /* lowlevel operations */
+        snd_i2c_ops_t *ops;     /* midlevel operations */
+
+        unsigned long private_value;
+        void *private_data;
+        void (*private_free)(snd_i2c_bus_t *bus);
+};
+
+#define snd_i2c_slave_bus(n) list_entry(n, snd_i2c_bus_t, buses)
+
+int snd_i2c_bus_create(snd_card_t *card, const char *name, snd_i2c_bus_t *master, snd_i2c_bus_t **ri2c);
+int snd_i2c_device_create(snd_i2c_bus_t *bus, const char *name, unsigned char addr, snd_i2c_device_t **rdevice);
+int snd_i2c_device_free(snd_i2c_device_t *device);
+
+static inline void snd_i2c_lock(snd_i2c_bus_t *bus) {
+        if (bus->master)
+                down(&bus->master->lock_mutex);
+        else
+                down(&bus->lock_mutex);
+}
+static inline void snd_i2c_unlock(snd_i2c_bus_t *bus) {
+        if (bus->master)
+                up(&bus->master->lock_mutex);
+        else
+                up(&bus->lock_mutex);
+}
+
+int snd_i2c_sendbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
+int snd_i2c_readbytes(snd_i2c_device_t *device, unsigned char *bytes, int count);
+int snd_i2c_probeaddr(snd_i2c_bus_t *bus, unsigned short addr);
+
+#endif /* __SOUND_I2C_H */