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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | #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 * * */ #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 */ 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 */ |