linux/include
Jean Delvare 4b2643d7d9 i2c: Fix the i2c_smbus_read_i2c_block_data() prototype
Let the drivers specify how many bytes they want to read with
i2c_smbus_read_i2c_block_data(). So far, the block count was
hard-coded to I2C_SMBUS_BLOCK_MAX (32), which did not make much sense.
Many driver authors complained about this before, and I believe it's
about time to fix it. Right now, authors have to do technically stupid
things, such as individual byte reads or full-fledged I2C messaging,
to work around the problem. We do not want to encourage that.

I even found that some bus drivers (e.g. i2c-amd8111) already
implemented I2C block read the "right" way, that is, they didn't
follow the old, broken standard. The fact that it was never noticed
before just shows how little i2c_smbus_read_i2c_block_data() was used,
which isn't that surprising given how broken its prototype was so far.

There are some obvious compatiblity considerations:
* This changes the i2c_smbus_read_i2c_block_data() prototype. Users
  outside the kernel tree will notice at compilation time, and will
  have to update their code.
* User-space has access to i2c_smbus_xfer() directly using i2c-dev, so
  the changed expectations would affect tools such as i2cdump. In order
  to preserve binary compatibility, we give I2C_SMBUS_I2C_BLOCK_DATA
  a new numeric value, and define I2C_SMBUS_I2C_BLOCK_BROKEN with the
  old numeric value. When i2c-dev receives a transaction with the
  old value, it can convert it to the new format on the fly.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2007-07-12 14:12:29 +02:00
..
acpi Pull osi-now into release branch 2007-06-02 01:02:09 -04:00
asm-alpha ALPHA: misc fixes 2007-06-01 08:18:29 -07:00
asm-arm Introduce fixed sys_sync_file_range2() syscall, implement on PowerPC and ARM 2007-06-28 11:38:30 -07:00
asm-arm26 lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-avr32 lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-blackfin lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-cris lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-frv lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-generic sched: simplify sched_find_first_bit() 2007-07-09 18:52:00 +02:00
asm-h8300 lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-i386 i386: es7000 build breakage fix 2007-07-06 10:23:43 -07:00
asm-ia64 lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-m32r lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-m68k lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-m68knommu
asm-mips lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-parisc lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-powerpc [POWERPC] Uninline and export virq_to_hw() for the pasemi_mac driver 2007-07-02 13:29:21 +10:00
asm-ppc Rework ptep_set_access_flags and fix sun4c 2007-06-16 13:16:16 -07:00
asm-s390 lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-sh lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-sh64 sh64: generic quicklist support. 2007-05-14 09:55:35 +09:00
asm-sparc Rework ptep_set_access_flags and fix sun4c 2007-06-16 13:16:16 -07:00
asm-sparc64 [SPARC64]: Add linux/pagemap.h to asm/tlb.h 2007-06-28 21:25:31 -07:00
asm-um uml: add asm/paravirt.h 2007-06-24 08:59:11 -07:00
asm-v850 lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
asm-x86_64 x86_64: Fix eventd/timerfd syscalls 2007-06-20 14:27:25 -07:00
asm-xtensa lots-of-architectures: enable arbitary speed tty support 2007-07-10 17:51:13 -07:00
crypto
keys
linux i2c: Fix the i2c_smbus_read_i2c_block_data() prototype 2007-07-12 14:12:29 +02:00
math-emu
media
mtd
net AX88796 network driver 2007-07-10 12:41:08 -04:00
pcmcia PCMCIA-NETDEV : add new ID of lan&modem multifunction card 2007-07-08 22:16:39 -04:00
rdma Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband 2007-05-21 16:19:32 -07:00
rxrpc
scsi
sound [ALSA] version 1.0.14 2007-05-31 11:03:27 +02:00
video atmel_lcdfb: AT91/AT32 LCD Controller framebuffer driver 2007-05-11 08:29:37 -07:00
Kbuild