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Add support for 10-bit addressing, per i2c specs. This has not been tested

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with any actual 10-bit devices (as I don't have any), but it doesn't seem to
impact 7-bit addressing any.  Approved by christos@, briggs@, and thorpej@.
This commit is contained in:
gdamore 2006-07-14 17:25:17 +00:00
parent a2f707bc1b
commit 4c26da3f0e
1 changed files with 31 additions and 8 deletions
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39
sys/dev/i2c/i2c_bitbang.c
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@ -1,4 +1,4 @@
/* $NetBSD: i2c_bitbang.c,v 1.3 2006/03/05 17:33:33 christos Exp $ */
/* $NetBSD: i2c_bitbang.c,v 1.4 2006/07/14 17:25:17 gdamore Exp $ */
/*
* Copyright (c) 2003 Wasabi Systems, Inc.
@ -88,16 +88,39 @@ int
i2c_bitbang_initiate_xfer(void *v, i2c_addr_t addr, int flags,
i2c_bitbang_ops_t ops)
{
int i2caddr;
/* XXX Only support 7-bit addressing for now. */
if ((addr & 0x78) == 0x78)
return (EINVAL);
if (addr < 0x80) {
uint8_t i2caddr;
i2caddr = (addr << 1) | ((flags & I2C_F_READ) ? 1 : 0);
/* disallow the 10-bit address prefix */
if ((addr & 0x78) == 0x78)
return EINVAL;
i2caddr = (addr << 1) | ((flags & I2C_F_READ) ? 1 : 0);
(void) i2c_bitbang_send_start(v, flags, ops);
(void) i2c_bitbang_send_start(v, flags, ops);
return (i2c_bitbang_write_byte(v, i2caddr, flags & ~I2C_F_STOP, ops));
return (i2c_bitbang_write_byte(v, i2caddr,
flags & ~I2C_F_STOP, ops));
} else if (addr < 0x400) {
uint16_t i2caddr;
int rv;
i2caddr = (addr << 1) | ((flags & I2C_F_READ) ? 1 : 0) |
0xf000;
(void) i2c_bitbang_send_start(v, flags, ops);
rv = i2c_bitbang_write_byte(v, i2caddr >> 8,
flags & ~I2C_F_STOP, ops);
/* did a slave ack the 10-bit prefix? */
if (rv != 0)
return rv;
/* send the lower 7-bits (+ read/write mode) */
return (i2c_bitbang_write_byte(v, i2caddr & 0xff,
flags & ~I2C_F_STOP, ops));
} else
return EINVAL;
}
int