multimedia/device/mpp/include/hi_spi.h

114 lines
3.9 KiB
C

#ifndef __HI_SPI_H__
#define __HI_SPI_H__
typedef unsigned long long __u64;
typedef unsigned int __u32;
typedef unsigned short __u16;
typedef unsigned char __u8;
/* User space versions of kernel symbols for SPI clocking modes,
* matching <linux/spi/spi.h>
*/
#define SPI_CPHA 0x01
#define SPI_CPOL 0x02
#define SPI_MODE_0 (0|0)
#define SPI_MODE_1 (0|SPI_CPHA)
#define SPI_MODE_2 (SPI_CPOL|0)
#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
#define SPI_CS_HIGH 0x04
#define SPI_LSB_FIRST 0x08
#define SPI_3WIRE 0x10
#define SPI_LOOP 0x20
#define SPI_NO_CS 0x40
#define SPI_READY 0x80
/*---------------------------------------------------------------------------*/
/* IOCTL commands */
#define SPI_IOC_MAGIC 'k'
/**
* struct spi_ioc_transfer - describes a single SPI transfer
* @tx_buf: Holds pointer to userspace buffer with transmit data, or null.
* If no data is provided, zeroes are shifted out.
* @rx_buf: Holds pointer to userspace buffer for receive data, or null.
* @len: Length of tx and rx buffers, in bytes.
* @speed_hz: Temporary override of the device's bitrate.
* @bits_per_word: Temporary override of the device's wordsize.
* @delay_usecs: If nonzero, how long to delay after the last bit transfer
* before optionally deselecting the device before the next transfer.
* @cs_change: True to deselect device before starting the next transfer.
*
* This structure is mapped directly to the kernel spi_transfer structure;
* the fields have the same meanings, except of course that the pointers
* are in a different address space (and may be of different sizes in some
* cases, such as 32-bit i386 userspace over a 64-bit x86_64 kernel).
* Zero-initialize the structure, including currently unused fields, to
* accommodate potential future updates.
*
* SPI_IOC_MESSAGE gives userspace the equivalent of kernel spi_sync().
* Pass it an array of related transfers, they'll execute together.
* Each transfer may be half duplex (either direction) or full duplex.
*
* struct spi_ioc_transfer mesg[4];
* ...
* status = ioctl(fd, SPI_IOC_MESSAGE(4), mesg);
*
* So for example one transfer might send a nine bit command (right aligned
* in a 16-bit word), the next could read a block of 8-bit data before
* terminating that command by temporarily deselecting the chip; the next
* could send a different nine bit command (re-selecting the chip), and the
* last transfer might write some register values.
*/
struct spi_ioc_transfer {
__u64 tx_buf;
__u64 rx_buf;
__u32 len;
__u32 speed_hz;
__u16 delay_usecs;
__u8 bits_per_word;
__u8 cs_change;
__u32 pad;
/* If the contents of 'struct spi_ioc_transfer' ever change
* incompatibly, then the ioctl number (currently 0) must change;
* ioctls with constant size fields get a bit more in the way of
* error checking than ones (like this) where that field varies.
*
* NOTE: struct layout is the same in 64bit and 32bit userspace.
*/
};
/* not all platforms use <asm-generic/ioctl.h> or _IOC_TYPECHECK() ... */
#define SPI_MSGSIZE(N) \
((((N)*(sizeof (struct spi_ioc_transfer))) < (1 << _IOC_SIZEBITS)) \
? ((N)*(sizeof (struct spi_ioc_transfer))) : 0)
#define SPI_IOC_MESSAGE(N) _IOW(SPI_IOC_MAGIC, 0, char[SPI_MSGSIZE(N)])
/* Read / Write of SPI mode (SPI_MODE_0..SPI_MODE_3) */
#define SPI_IOC_RD_MODE _IOR(SPI_IOC_MAGIC, 1, __u8)
#define SPI_IOC_WR_MODE _IOW(SPI_IOC_MAGIC, 1, __u8)
/* Read / Write SPI bit justification */
#define SPI_IOC_RD_LSB_FIRST _IOR(SPI_IOC_MAGIC, 2, __u8)
#define SPI_IOC_WR_LSB_FIRST _IOW(SPI_IOC_MAGIC, 2, __u8)
/* Read / Write SPI device word length (1..N) */
#define SPI_IOC_RD_BITS_PER_WORD _IOR(SPI_IOC_MAGIC, 3, __u8)
#define SPI_IOC_WR_BITS_PER_WORD _IOW(SPI_IOC_MAGIC, 3, __u8)
/* Read / Write SPI device default max speed hz */
#define SPI_IOC_RD_MAX_SPEED_HZ _IOR(SPI_IOC_MAGIC, 4, __u32)
#define SPI_IOC_WR_MAX_SPEED_HZ _IOW(SPI_IOC_MAGIC, 4, __u32)
#endif /* __HI_SPI_H__ */