History

Merge tag 'disintegrate-spi-20121009' of git://git.infradead.org/users/dhowells/linux-headers

Pull spi UAPI disintegration from David Howells: "This is to complete part of the Userspace API (UAPI) disintegration for which the preparatory patches were pulled recently. After these patches, userspace headers will be segregated into: include/uapi/linux/.../foo.h for the userspace interface stuff, and: include/linux/.../foo.h for the strictly kernel internal stuff. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Grant Likely <grant.likely@secretlab.ca>" * tag 'disintegrate-spi-20121009' of git://git.infradead.org/users/dhowells/linux-headers: UAPI: (Scripted) Disintegrate include/linux/spi

Linus Torvalds committed 14 years ago

Commit 034b5ee2 parents 7c5a473 7939d3c3 files · +1 −1Browse files

Showing the changes to include/uapi/linux (2 of 3 files). Show all

Unified · Split

2 files
  1. include/uapi/linux/spi/Kbuild +1 −0
  2. include/uapi/linux/spi/spidev.h +131 −0
include/uapi/linux/spi/Kbuild+1−0
@@ -1 +1,2 @@
11 # UAPI Header export list
2+header-y += spidev.h
include/uapi/linux/spi/spidev.h+131−0
@@ -0,0 +1,131 @@
1+/*
2+ * include/linux/spi/spidev.h
3+ *
4+ * Copyright (C) 2006 SWAPP
5+ * Andrea Paterniani <a.paterniani@swapp-eng.it>
6+ *
7+ * This program is free software; you can redistribute it and/or modify
8+ * it under the terms of the GNU General Public License as published by
9+ * the Free Software Foundation; either version 2 of the License, or
10+ * (at your option) any later version.
11+ *
12+ * This program is distributed in the hope that it will be useful,
13+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
14+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15+ * GNU General Public License for more details.
16+ *
17+ * You should have received a copy of the GNU General Public License
18+ * along with this program; if not, write to the Free Software
19+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20+ */
21+
22+#ifndef SPIDEV_H
23+#define SPIDEV_H
24+
25+#include <linux/types.h>
26+
27+/* User space versions of kernel symbols for SPI clocking modes,
28+ * matching <linux/spi/spi.h>
29+ */
30+
31+#define SPI_CPHA 0x01
32+#define SPI_CPOL 0x02
33+
34+#define SPI_MODE_0 (0|0)
35+#define SPI_MODE_1 (0|SPI_CPHA)
36+#define SPI_MODE_2 (SPI_CPOL|0)
37+#define SPI_MODE_3 (SPI_CPOL|SPI_CPHA)
38+
39+#define SPI_CS_HIGH 0x04
40+#define SPI_LSB_FIRST 0x08
41+#define SPI_3WIRE 0x10
42+#define SPI_LOOP 0x20
43+#define SPI_NO_CS 0x40
44+#define SPI_READY 0x80
45+
46+/*---------------------------------------------------------------------------*/
47+
48+/* IOCTL commands */
49+
50+#define SPI_IOC_MAGIC 'k'
51+
52+/**
53+ * struct spi_ioc_transfer - describes a single SPI transfer
54+ * @tx_buf: Holds pointer to userspace buffer with transmit data, or null.
55+ * If no data is provided, zeroes are shifted out.
56+ * @rx_buf: Holds pointer to userspace buffer for receive data, or null.
57+ * @len: Length of tx and rx buffers, in bytes.
58+ * @speed_hz: Temporary override of the device's bitrate.
59+ * @bits_per_word: Temporary override of the device's wordsize.
60+ * @delay_usecs: If nonzero, how long to delay after the last bit transfer
61+ * before optionally deselecting the device before the next transfer.
62+ * @cs_change: True to deselect device before starting the next transfer.
63+ *
64+ * This structure is mapped directly to the kernel spi_transfer structure;
65+ * the fields have the same meanings, except of course that the pointers
66+ * are in a different address space (and may be of different sizes in some
67+ * cases, such as 32-bit i386 userspace over a 64-bit x86_64 kernel).
68+ * Zero-initialize the structure, including currently unused fields, to
69+ * accommodate potential future updates.
70+ *
71+ * SPI_IOC_MESSAGE gives userspace the equivalent of kernel spi_sync().
72+ * Pass it an array of related transfers, they'll execute together.
73+ * Each transfer may be half duplex (either direction) or full duplex.
74+ *
75+ * struct spi_ioc_transfer mesg[4];
76+ * ...
77+ * status = ioctl(fd, SPI_IOC_MESSAGE(4), mesg);
78+ *
79+ * So for example one transfer might send a nine bit command (right aligned
80+ * in a 16-bit word), the next could read a block of 8-bit data before
81+ * terminating that command by temporarily deselecting the chip; the next
82+ * could send a different nine bit command (re-selecting the chip), and the
83+ * last transfer might write some register values.
84+ */
85+struct spi_ioc_transfer {
86+ __u64 tx_buf;
87+ __u64 rx_buf;
88+
89+ __u32 len;
90+ __u32 speed_hz;
91+
92+ __u16 delay_usecs;
93+ __u8 bits_per_word;
94+ __u8 cs_change;
95+ __u32 pad;
96+
97+ /* If the contents of 'struct spi_ioc_transfer' ever change
98+ * incompatibly, then the ioctl number (currently 0) must change;
99+ * ioctls with constant size fields get a bit more in the way of
100+ * error checking than ones (like this) where that field varies.
101+ *
102+ * NOTE: struct layout is the same in 64bit and 32bit userspace.
103+ */
104+};
105+
106+/* not all platforms use <asm-generic/ioctl.h> or _IOC_TYPECHECK() ... */
107+#define SPI_MSGSIZE(N) \
108+ ((((N)*(sizeof (struct spi_ioc_transfer))) < (1 << _IOC_SIZEBITS)) \
109+ ? ((N)*(sizeof (struct spi_ioc_transfer))) : 0)
110+#define SPI_IOC_MESSAGE(N) _IOW(SPI_IOC_MAGIC, 0, char[SPI_MSGSIZE(N)])
111+
112+
113+/* Read / Write of SPI mode (SPI_MODE_0..SPI_MODE_3) */
114+#define SPI_IOC_RD_MODE _IOR(SPI_IOC_MAGIC, 1, __u8)
115+#define SPI_IOC_WR_MODE _IOW(SPI_IOC_MAGIC, 1, __u8)
116+
117+/* Read / Write SPI bit justification */
118+#define SPI_IOC_RD_LSB_FIRST _IOR(SPI_IOC_MAGIC, 2, __u8)
119+#define SPI_IOC_WR_LSB_FIRST _IOW(SPI_IOC_MAGIC, 2, __u8)
120+
121+/* Read / Write SPI device word length (1..N) */
122+#define SPI_IOC_RD_BITS_PER_WORD _IOR(SPI_IOC_MAGIC, 3, __u8)
123+#define SPI_IOC_WR_BITS_PER_WORD _IOW(SPI_IOC_MAGIC, 3, __u8)
124+
125+/* Read / Write SPI device default max speed hz */
126+#define SPI_IOC_RD_MAX_SPEED_HZ _IOR(SPI_IOC_MAGIC, 4, __u32)
127+#define SPI_IOC_WR_MAX_SPEED_HZ _IOW(SPI_IOC_MAGIC, 4, __u32)
128+
129+
130+
131+#endif /* SPIDEV_H */