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1 | /* |
2 | * i2c-gpio interface to platform code |
3 | * |
4 | * Copyright (C) 2007 Atmel Corporation |
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 version 2 as |
8 | * published by the Free Software Foundation. |
9 | */ |
10 | #ifndef _LINUX_I2C_GPIO_H |
11 | #define _LINUX_I2C_GPIO_H |
12 | |
13 | /** |
14 | * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio |
15 | * @sda_pin: GPIO pin ID to use for SDA |
16 | * @scl_pin: GPIO pin ID to use for SCL |
17 | * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz |
18 | * @timeout: clock stretching timeout in jiffies. If the slave keeps |
19 | * SCL low for longer than this, the transfer will time out. |
20 | * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin |
21 | * isn't actively driven high when setting the output value high. |
22 | * gpio_get_value() must return the actual pin state even if the |
23 | * pin is configured as an output. |
24 | * @scl_is_open_drain: SCL is set up as open drain. Same requirements |
25 | * as for sda_is_open_drain apply. |
26 | * @scl_is_output_only: SCL output drivers cannot be turned off. |
27 | */ |
28 | struct i2c_gpio_platform_data { |
29 | unsigned int sda_pin; |
30 | unsigned int scl_pin; |
31 | int udelay; |
32 | int timeout; |
33 | unsigned int sda_is_open_drain:1; |
34 | unsigned int scl_is_open_drain:1; |
35 | unsigned int scl_is_output_only:1; |
36 | }; |
37 | |
38 | #endif /* _LINUX_I2C_GPIO_H */ |
39 |
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