| 1 | |
| 2 | * i2c-gpio interface to platform code
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| 3 | *
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| 4 | * Copyright (C) 2007 Atmel Corporation
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| 5 | *
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| 6 | * This program is free software; you can redistribute it and/or modify
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| 7 | * it under the terms of the GNU General Public License version 2 as
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| 8 | * published by the Free Software Foundation.
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| 9 |
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| 10 | #ifndef _LINUX_I2C_GPIO_H
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| 11 | #define _LINUX_I2C_GPIO_H
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| 12 |
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| 13 | |
| 14 | * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
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| 15 | * @sda_pin: GPIO pin ID to use for SDA
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| 16 | * @scl_pin: GPIO pin ID to use for SCL
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| 17 | * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
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| 18 | * @timeout: clock stretching timeout in jiffies. If the slave keeps
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| 19 | * SCL low for longer than this, the transfer will time out.
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| 20 | * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
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| 21 | * isn't actively driven high when setting the output value high.
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| 22 | * gpio_get_value() must return the actual pin state even if the
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| 23 | * pin is configured as an output.
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| 24 | * @scl_is_open_drain: SCL is set up as open drain. Same requirements
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| 25 | * as for sda_is_open_drain apply.
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| 26 | * @scl_is_output_only: SCL output drivers cannot be turned off.
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| 27 |
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| 28 | struct i2c_gpio_platform_data {
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| 29 | unsigned int sda_pin;
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| 30 | unsigned int scl_pin;
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| 31 | int udelay;
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| 32 | int timeout;
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| 33 | unsigned int sda_is_open_drain:1;
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| 34 | unsigned int scl_is_open_drain:1;
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| 35 | unsigned int scl_is_output_only:1;
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| 36 | };
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| 37 |
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| 38 | #endif
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