| Ben Hutchings | 8ceee66 | 2008-04-27 12:55:59 +0100 | [diff] [blame] | 1 | /**************************************************************************** |
| 2 | * Driver for Solarflare Solarstorm network controllers and boards |
| 3 | * Copyright 2005 Fen Systems Ltd. |
| 4 | * Copyright 2006 Solarflare Communications Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 as published |
| 8 | * by the Free Software Foundation, incorporated herein by reference. |
| 9 | */ |
| 10 | |
| 11 | #ifndef EFX_I2C_DIRECT_H |
| 12 | #define EFX_I2C_DIRECT_H |
| 13 | |
| 14 | #include "net_driver.h" |
| 15 | |
| 16 | /* |
| 17 | * Direct control of an I2C bus |
| 18 | */ |
| 19 | |
| 20 | struct efx_i2c_interface; |
| 21 | |
| 22 | /** |
| 23 | * struct efx_i2c_bit_operations - I2C bus direct control methods |
| 24 | * |
| 25 | * I2C bus direct control methods. |
| 26 | * |
| 27 | * @setsda: Set state of SDA line |
| 28 | * @setscl: Set state of SCL line |
| 29 | * @getsda: Get state of SDA line |
| 30 | * @getscl: Get state of SCL line |
| 31 | * @udelay: Delay between each bit operation |
| 32 | * @mdelay: Delay between each byte write |
| 33 | */ |
| 34 | struct efx_i2c_bit_operations { |
| 35 | void (*setsda) (struct efx_i2c_interface *i2c); |
| 36 | void (*setscl) (struct efx_i2c_interface *i2c); |
| 37 | int (*getsda) (struct efx_i2c_interface *i2c); |
| 38 | int (*getscl) (struct efx_i2c_interface *i2c); |
| 39 | unsigned int udelay; |
| 40 | unsigned int mdelay; |
| 41 | }; |
| 42 | |
| 43 | /** |
| 44 | * struct efx_i2c_interface - an I2C interface |
| 45 | * |
| 46 | * An I2C interface. |
| 47 | * |
| 48 | * @efx: Attached Efx NIC |
| 49 | * @op: I2C bus control methods |
| 50 | * @sda: Current output state of SDA line |
| 51 | * @scl: Current output state of SCL line |
| 52 | */ |
| 53 | struct efx_i2c_interface { |
| 54 | struct efx_nic *efx; |
| 55 | struct efx_i2c_bit_operations *op; |
| 56 | unsigned int sda:1; |
| 57 | unsigned int scl:1; |
| 58 | }; |
| 59 | |
| 60 | extern int efx_i2c_check_presence(struct efx_i2c_interface *i2c, u8 device_id); |
| 61 | extern int efx_i2c_fast_read(struct efx_i2c_interface *i2c, |
| 62 | u8 device_id, u8 offset, |
| 63 | u8 *data, unsigned int len); |
| 64 | extern int efx_i2c_fast_write(struct efx_i2c_interface *i2c, |
| 65 | u8 device_id, u8 offset, |
| 66 | const u8 *data, unsigned int len); |
| 67 | extern int efx_i2c_read(struct efx_i2c_interface *i2c, |
| 68 | u8 device_id, u8 offset, u8 *data, unsigned int len); |
| 69 | extern int efx_i2c_write(struct efx_i2c_interface *i2c, |
| 70 | u8 device_id, u8 offset, |
| 71 | const u8 *data, unsigned int len); |
| 72 | |
| 73 | extern int efx_i2c_send_bytes(struct efx_i2c_interface *i2c, u8 device_id, |
| 74 | const u8 *bytes, unsigned int len); |
| 75 | |
| 76 | extern int efx_i2c_recv_bytes(struct efx_i2c_interface *i2c, u8 device_id, |
| 77 | u8 *bytes, unsigned int len); |
| 78 | |
| 79 | |
| 80 | /* Versions of the API that retry on failure. */ |
| 81 | extern int efx_i2c_check_presence_retry(struct efx_i2c_interface *i2c, |
| 82 | u8 device_id); |
| 83 | |
| 84 | extern int efx_i2c_read_retry(struct efx_i2c_interface *i2c, |
| 85 | u8 device_id, u8 offset, u8 *data, unsigned int len); |
| 86 | |
| 87 | extern int efx_i2c_write_retry(struct efx_i2c_interface *i2c, |
| 88 | u8 device_id, u8 offset, |
| 89 | const u8 *data, unsigned int len); |
| 90 | |
| 91 | #endif /* EFX_I2C_DIRECT_H */ |