1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * i2c-gpio interface to platform code
4 *
5 * Copyright (C) 2007 Atmel Corporation
6 */
7 #ifndef _LINUX_I2C_GPIO_H
8 #define _LINUX_I2C_GPIO_H
9
10 /**
11 * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
12 * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
13 * @timeout: clock stretching timeout in jiffies. If the slave keeps
14 * SCL low for longer than this, the transfer will time out.
15 * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
16 * isn't actively driven high when setting the output value high.
17 * gpio_get_value() must return the actual pin state even if the
18 * pin is configured as an output.
19 * @sda_is_output_only: SDA output drivers can't be turned off.
20 * This is for clients that can only read SDA/SCL.
21 * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up.
22 * Therefore disable open-drain.
23 * @scl_is_open_drain: SCL is set up as open drain. Same requirements
24 * as for sda_is_open_drain apply.
25 * @scl_is_output_only: SCL output drivers cannot be turned off.
26 * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up.
27 * Therefore disable open-drain.
28 */
29 struct i2c_gpio_platform_data {
30 int udelay;
31 int timeout;
32 unsigned int sda_is_open_drain:1;
33 unsigned int sda_is_output_only:1;
34 unsigned int sda_has_no_pullup:1;
35 unsigned int scl_is_open_drain:1;
36 unsigned int scl_is_output_only:1;
37 unsigned int scl_has_no_pullup:1;
38 };
39
40 #endif /* _LINUX_I2C_GPIO_H */
41
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