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i2cdetect: don't die on addresses already in use by drivers

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We can't use i2c_set_slave_addr() in i2cdetect, as we have to check for
EBUSY after calling ioctl(I2C_SLAVE) and print 'UU' on busy addresses
instead of bailing-out.

While we're at it: reorder definitions of local vars in i2cdetect_main().

function                                             old     new   delta
i2cdetect_main                                       703     744     +41
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 41/0)               Total: 41 bytes
   text	   data	    bss	    dec	    hex	filename
 826097	   4164	   9584	 839845	  cd0a5	busybox_old
 826145	   4164	   9584	 839893	  cd0d5	busybox_unstripped

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Bartosz Golaszewski 2015-06-05 10:27:28 +02:00 committed by Denys Vlasenko
parent d291c2fdd5
commit 314742747d
1 changed files with 19 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
miscutils/i2c_tools.c
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@ -355,6 +355,13 @@ static void i2c_set_pec(int fd, int pec)
itoptr(pec ? 1 : 0),
"can't set PEC");
}
static void i2c_set_slave_addr(int fd, int addr, int force)
{
ioctl_or_perror_and_die(fd, force ? I2C_SLAVE_FORCE : I2C_SLAVE,
itoptr(addr),
"can't set address to 0x%02x", addr);
}
#endif /* ENABLE_I2CGET || ENABLE_I2CSET || ENABLE_I2CDUMP */
#if ENABLE_I2CGET || ENABLE_I2CSET
@ -390,13 +397,6 @@ static int i2c_dev_open(int i2cbus)
return fd;
}
static void i2c_set_slave_addr(int fd, int addr, int force)
{
ioctl_or_perror_and_die(fd, force ? I2C_SLAVE_FORCE : I2C_SLAVE,
itoptr(addr),
"can't set address to 0x%02x", addr);
}
/* Size reducing helpers for xxx_check_funcs(). */
static void get_funcs_matrix(int fd, unsigned long *funcs)
{
@ -1281,11 +1281,9 @@ int i2cdetect_main(int argc UNUSED_PARAM, char **argv)
opt_F = (1 << 4), opt_l = (1 << 5);
const char *const optstr = "yaqrFl";
int fd, bus_num, i, j, mode = DETECT_MODE_AUTO;
int status;
unsigned first = 0x00, last = 0x77;
int fd, bus_num, i, j, mode = DETECT_MODE_AUTO, status;
unsigned first = 0x00, last = 0x77, opts;
unsigned long funcs;
unsigned opts;
opt_complementary = "q--r:r--q:" /* mutually exclusive */
"?3"; /* up to 3 args */
@ -1370,7 +1368,16 @@ int i2cdetect_main(int argc UNUSED_PARAM, char **argv)
continue;
}
i2c_set_slave_addr(fd, i + j, 0);
status = ioctl(fd, I2C_SLAVE, itoptr(i + j));
if (status < 0) {
if (errno == EBUSY) {
printf("UU ");
continue;
}
bb_perror_msg_and_die(
"can't set address to 0x%02x", i + j);
}
switch (mode) {
case DETECT_MODE_READ: