drivers/media/video/tuner-i2c.h

   1 /*
   2     tuner-i2c.h - i2c interface for different tuners
   3
   4     Copyright (C) 2007 Michael Krufky (mkrufky@linuxtv.org)
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #ifndef __TUNER_I2C_H__
  22 #define __TUNER_I2C_H__
  23
  24 #include <linux/i2c.h>
  25
  26 struct tuner_i2c_props {
  27         u8 addr;
  28         struct i2c_adapter *adap;
  29 };
  30
  31 static inline int tuner_i2c_xfer_send(struct tuner_i2c_props *props, char *buf, int len)
  32 {
  33         struct i2c_msg msg = { .addr = props->addr, .flags = 0,
  34                                .buf = buf, .len = len };
  35         int ret = i2c_transfer(props->adap, &msg, 1);
  36
  37         return (ret == 1) ? len : ret;
  38 }
  39
  40 static inline int tuner_i2c_xfer_recv(struct tuner_i2c_props *props, char *buf, int len)
  41 {
  42         struct i2c_msg msg = { .addr = props->addr, .flags = I2C_M_RD,
  43                                .buf = buf, .len = len };
  44         int ret = i2c_transfer(props->adap, &msg, 1);
  45
  46         return (ret == 1) ? len : ret;
  47 }
  48
  49 static inline int tuner_i2c_xfer_send_recv(struct tuner_i2c_props *props,
  50                                            char *obuf, int olen,
  51                                            char *ibuf, int ilen)
  52 {
  53         struct i2c_msg msg[2] = { { .addr = props->addr, .flags = 0,
  54                                     .buf = obuf, .len = olen },
  55                                   { .addr = props->addr, .flags = I2C_M_RD,
  56                                     .buf = ibuf, .len = ilen } };
  57         int ret = i2c_transfer(props->adap, msg, 2);
  58
  59         return (ret == 2) ? ilen : ret;
  60 }
  61
  62 #define tuner_warn(fmt, arg...) do {                                    \
  63         printk(KERN_WARNING "%s %d-%04x: " fmt, PREFIX,                 \
  64                         i2c_adapter_id(priv->i2c_props.adap),           \
  65                         priv->i2c_props.addr, ##arg);                   \
  66          } while (0)
  67
  68 #define tuner_info(fmt, arg...) do {                                    \
  69         printk(KERN_INFO "%s %d-%04x: " fmt, PREFIX,                    \
  70                         i2c_adapter_id(priv->i2c_props.adap),           \
  71                         priv->i2c_props.addr , ##arg);                  \
  72         } while (0)
  73
  74 #define tuner_err(fmt, arg...) do {                                     \
  75         printk(KERN_ERR "%s %d-%04x: " fmt, PREFIX,                     \
  76                         i2c_adapter_id(priv->i2c_props.adap),           \
  77                         priv->i2c_props.addr , ##arg);                  \
  78         } while (0)
  79
  80 #define tuner_dbg(fmt, arg...) do {                                     \
  81         if ((debug))                                                    \
  82                 printk(KERN_DEBUG "%s %d-%04x: " fmt, PREFIX,           \
  83                         i2c_adapter_id(priv->i2c_props.adap),           \
  84                         priv->i2c_props.addr , ##arg);                  \
  85         } while (0)
  86
  87 #endif /* __TUNER_I2C_H__ */