linux-2.6: Add a driver to run an MMC or SD card over a GPIO based SPI interface.
[openwrt/svn-archive/archive.git] / package / mmc_over_gpio / src / linux / spi / spi_gpio.h
1 /*
2 * spi_gpio interface to platform code
3 *
4 * Copyright (c) 2008 Piotr Skamruk
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_SPI_SPI_GPIO
11 #define _LINUX_SPI_SPI_GPIO
12
13 #include <linux/types.h>
14 #include <linux/spi/spi.h>
15
16
17 /** struct spi_gpio_platform_data - Data definitions for a SPI-GPIO device.
18 * This structure holds information about a GPIO-based SPI device.
19 *
20 * @pin_clk: The GPIO pin number of the CLOCK pin.
21 *
22 * @pin_miso: The GPIO pin number of the MISO pin.
23 *
24 * @pin_mosi: The GPIO pin number of the MOSI pin.
25 *
26 * @pin_cs: The GPIO pin number of the CHIPSELECT pin.
27 *
28 * @cs_activelow: If true, the chip is selected when the CS line is low.
29 *
30 * @no_spi_delay: If true, no delay is done in the lowlevel bitbanging.
31 * Note that doing no delay is not standards compliant,
32 * but it might be needed to speed up transfers on some
33 * slow embedded machines.
34 *
35 * @boardinfo_setup: This callback is called after the
36 * SPI master device was registered, but before the
37 * device is registered.
38 * @boardinfo_setup_data: Data argument passed to boardinfo_setup().
39 */
40 struct spi_gpio_platform_data {
41 unsigned int pin_clk;
42 unsigned int pin_miso;
43 unsigned int pin_mosi;
44 unsigned int pin_cs;
45 bool cs_activelow;
46 bool no_spi_delay;
47 int (*boardinfo_setup)(struct spi_board_info *bi,
48 struct spi_master *master,
49 void *data);
50 void *boardinfo_setup_data;
51 };
52
53 #endif /* _LINUX_SPI_SPI_GPIO */