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Diffstat (limited to 'include/sound/i2c.h')
-rw-r--r-- | include/sound/i2c.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/include/sound/i2c.h b/include/sound/i2c.h new file mode 100644 index 00000000000..a665ddf9c14 --- /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 */ |