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i2c-dev.h

i2c-dev.h 2.5 KB
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  1. /*
    2. 

  2.     i2c-dev.h - i2c-bus driver, char device interface
    3. 

  3. 

  4.     Copyright (C) 1995-97 Simon G. Vogl
    5. 

  5.     Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
    6. 

  6. 

  7.     This program is free software; you can redistribute it and/or modify
    8. 

  8.     it under the terms of the GNU General Public License as published by
    9. 

  9.     the Free Software Foundation; either version 2 of the License, or
    10. 

  10.     (at your option) any later version.
    11. 

  11. 

  12.     This program is distributed in the hope that it will be useful,
    13. 

  13.     but WITHOUT ANY WARRANTY; without even the implied warranty of
    14. 

  14.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    15. 

  15.     GNU General Public License for more details.
    16. 

  16. 

  17.     You should have received a copy of the GNU General Public License
    18. 

  18.     along with this program; if not, write to the Free Software
    19. 

  19.     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
    20. 

  20.     MA 02110-1301 USA.
    21. 

  21. */
    22. 

  22. 

  23. #ifndef _LINUX_I2C_DEV_H
    24. 

  24. #define _LINUX_I2C_DEV_H
    25. 

  25. 

  26. #include <linux/types.h>
    27. 

  27. 

  28. 

  29. /* /dev/i2c-X ioctl commands.  The ioctl's parameter is always an
    30. 

  30.  * unsigned long, except for:
    31. 

  31.  *	- I2C_FUNCS, takes pointer to an unsigned long
    32. 

  32.  *	- I2C_RDWR, takes pointer to struct i2c_rdwr_ioctl_data
    33. 

  33.  *	- I2C_SMBUS, takes pointer to struct i2c_smbus_ioctl_data
    34. 

  34.  */
    35. 

  35. #define I2C_RETRIES	0x0701	/* number of times a device address should
    36. 

  36. 				   be polled when not acknowledging */
    37. 

  37. #define I2C_TIMEOUT	0x0702	/* set timeout in units of 10 ms */
    38. 

  38. 

  39. /* NOTE: Slave address is 7 or 10 bits, but 10-bit addresses
    40. 

  40.  * are NOT supported! (due to code brokenness)
    41. 

  41.  */
    42. 

  42. #define I2C_SLAVE	0x0703	/* Use this slave address */
    43. 

  43. #define I2C_SLAVE_FORCE	0x0706	/* Use this slave address, even if it
    44. 

  44. 				   is already in use by a driver! */
    45. 

  45. #define I2C_TENBIT	0x0704	/* 0 for 7 bit addrs, != 0 for 10 bit */
    46. 

  46. 

  47. #define I2C_FUNCS	0x0705	/* Get the adapter functionality mask */
    48. 

  48. 

  49. #define I2C_RDWR	0x0707	/* Combined R/W transfer (one STOP only) */
    50. 

  50. 

  51. #define I2C_PEC		0x0708	/* != 0 to use PEC with SMBus */
    52. 

  52. #define I2C_SMBUS	0x0720	/* SMBus transfer */
    53. 

  53. 

  54. 

  55. /* This is the structure as used in the I2C_SMBUS ioctl call */
    56. 

  56. struct i2c_smbus_ioctl_data {
    57. 

  57. 	__u8 read_write;
    58. 

  58. 	__u8 command;
    59. 

  59. 	__u32 size;
    60. 

  60. 	union i2c_smbus_data *data;
    61. 

  61. };
    62. 

  62. 

  63. /* This is the structure as used in the I2C_RDWR ioctl call */
    64. 

  64. struct i2c_rdwr_ioctl_data {
    65. 

  65. 	struct i2c_msg *msgs;	/* pointers to i2c_msgs */
    66. 

  66. 	__u32 nmsgs;			/* number of i2c_msgs */
    67. 

  67. };
    68. 

  68. 

  69. #define  I2C_RDWR_IOCTL_MAX_MSGS	42
    70. 

  70. /* Originally defined with a typo, keep it for compatibility */
    71. 

  71. #define  I2C_RDRW_IOCTL_MAX_MSGS	I2C_RDWR_IOCTL_MAX_MSGS
    72. 

  72. 

  73. 

  74. #endif /* _LINUX_I2C_DEV_H */
    75.