i2c-gpio.h 1.2 KB

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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. * struct i2c_gpio_platform_data - Platform-dependent data for i2c-gpio
  14. * @udelay: signal toggle delay. SCL frequency is (500 / udelay) kHz
  15. * @timeout: clock stretching timeout in jiffies. If the slave keeps
  16. * SCL low for longer than this, the transfer will time out.
  17. * @sda_is_open_drain: SDA is configured as open drain, i.e. the pin
  18. * isn't actively driven high when setting the output value high.
  19. * gpio_get_value() must return the actual pin state even if the
  20. * pin is configured as an output.
  21. * @scl_is_open_drain: SCL is set up as open drain. Same requirements
  22. * as for sda_is_open_drain apply.
  23. * @scl_is_output_only: SCL output drivers cannot be turned off.
  24. */
  25. struct i2c_gpio_platform_data {
  26. int udelay;
  27. int timeout;
  28. unsigned int sda_is_open_drain:1;
  29. unsigned int scl_is_open_drain:1;
  30. unsigned int scl_is_output_only:1;
  31. };
  32. #endif /* _LINUX_I2C_GPIO_H */