1 #ifndef __SOUND_I2C_H 2 #define __SOUND_I2C_H 3 4 /* 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 * 22 */ 23 24 #define SND_I2C_DEVICE_ADDRTEN (1<<0) /* 10-bit I2C address */ 25 26 struct snd_i2c_device { 27 struct list_head list; 28 struct snd_i2c_bus *bus; /* I2C bus */ 29 char name[32]; /* some useful device name */ 30 unsigned short flags; /* device flags */ 31 unsigned short addr; /* device address (might be 10-bit) */ 32 unsigned long private_value; 33 void *private_data; 34 void (*private_free)(struct snd_i2c_device *device); 35 }; 36 37 #define snd_i2c_device(n) list_entry(n, struct snd_i2c_device, list) 38 39 struct snd_i2c_bit_ops { 40 void (*start)(struct snd_i2c_bus *bus); /* transfer start */ 41 void (*stop)(struct snd_i2c_bus *bus); /* transfer stop */ 42 void (*direction)(struct snd_i2c_bus *bus, int clock, int data); /* set line direction (0 = write, 1 = read) */ 43 void (*setlines)(struct snd_i2c_bus *bus, int clock, int data); 44 int (*getclock)(struct snd_i2c_bus *bus); 45 int (*getdata)(struct snd_i2c_bus *bus, int ack); 46 }; 47 48 struct snd_i2c_ops { 49 int (*sendbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count); 50 int (*readbytes)(struct snd_i2c_device *device, unsigned char *bytes, int count); 51 int (*probeaddr)(struct snd_i2c_bus *bus, unsigned short addr); 52 }; 53 54 struct snd_i2c_bus { 55 struct snd_card *card; /* card which I2C belongs to */ 56 char name[32]; /* some useful label */ 57 58 struct mutex lock_mutex; 59 60 struct snd_i2c_bus *master; /* master bus when SCK/SCL is shared */ 61 struct list_head buses; /* master: slave buses sharing SCK/SCL, slave: link list */ 62 63 struct list_head devices; /* attached devices to this bus */ 64 65 union { 66 struct snd_i2c_bit_ops *bit; 67 void *ops; 68 } hw_ops; /* lowlevel operations */ 69 const struct snd_i2c_ops *ops; /* midlevel operations */ 70 71 unsigned long private_value; 72 void *private_data; 73 void (*private_free)(struct snd_i2c_bus *bus); 74 }; 75 76 #define snd_i2c_slave_bus(n) list_entry(n, struct snd_i2c_bus, buses) 77 78 int snd_i2c_bus_create(struct snd_card *card, const char *name, 79 struct snd_i2c_bus *master, struct snd_i2c_bus **ri2c); 80 int snd_i2c_device_create(struct snd_i2c_bus *bus, const char *name, 81 unsigned char addr, struct snd_i2c_device **rdevice); 82 int snd_i2c_device_free(struct snd_i2c_device *device); 83 84 static inline void snd_i2c_lock(struct snd_i2c_bus *bus) 85 { 86 if (bus->master) 87 mutex_lock(&bus->master->lock_mutex); 88 else 89 mutex_lock(&bus->lock_mutex); 90 } 91 92 static inline void snd_i2c_unlock(struct snd_i2c_bus *bus) 93 { 94 if (bus->master) 95 mutex_unlock(&bus->master->lock_mutex); 96 else 97 mutex_unlock(&bus->lock_mutex); 98 } 99 100 int snd_i2c_sendbytes(struct snd_i2c_device *device, unsigned char *bytes, int count); 101 int snd_i2c_readbytes(struct snd_i2c_device *device, unsigned char *bytes, int count); 102 int snd_i2c_probeaddr(struct snd_i2c_bus *bus, unsigned short addr); 103 104 #endif /* __SOUND_I2C_H */ 105