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/*
* i2c.c - i2c commands
*
* Copyright (c) 2010 Eric Bénard <eric@eukrea.Com>, Eukréa Electromatique
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <errno.h>
#include <malloc.h>
#include <getopt.h>
#include <i2c/i2c.h>
static int do_i2c_probe(struct command *cmdtp, int argc, char *argv[])
{
struct i2c_adapter *adapter;
struct i2c_client client;
int startaddr = -1, stopaddr = -1, addr, ret;
u8 reg;
if (argc < 4)
return COMMAND_ERROR_USAGE;
adapter = i2c_get_adapter(simple_strtoul(argv[1], NULL, 0));
if (!adapter)
return -ENODEV;
client.adapter = adapter;
startaddr = simple_strtol(argv[2], NULL, 0);
stopaddr = simple_strtol(argv[3], NULL, 0);
if ((startaddr == -1) || (stopaddr == -1) || (startaddr > stopaddr))
return COMMAND_ERROR_USAGE;
if (stopaddr > 0x7F)
stopaddr = 0x7F;
printf("probing i2c range 0X%02x - 0x%02x :\n", startaddr, stopaddr);
for (addr = startaddr; addr <= stopaddr; addr++) {
client.addr = addr;
ret = i2c_write_reg(&client, 0x00, ®, 0);
if (ret == 0)
printf("0x%02x ", addr);
}
printf("\n");
return 0;
}
static const __maybe_unused char cmd_i2c_probe_help[] =
"Usage: i2c_probe bus 0xstartaddr 0xstopaddr\n"
"probe a range of i2c addresses.\n";
BAREBOX_CMD_START(i2c_probe)
.cmd = do_i2c_probe,
.usage = "probe for an i2c device",
BAREBOX_CMD_HELP(cmd_i2c_probe_help)
BAREBOX_CMD_END
static int do_i2c_write(struct command *cmdtp, int argc, char *argv[])
{
struct i2c_adapter *adapter = NULL;
struct i2c_client client;
int addr = -1, reg = -1, count = -1, verbose = 0, ret, opt, i, bus = 0;
u8 *buf;
while ((opt = getopt(argc, argv, "a:b:r:v")) > 0) {
switch (opt) {
case 'a':
addr = simple_strtol(optarg, NULL, 0);
break;
case 'r':
reg = simple_strtol(optarg, NULL, 0);
break;
case 'b':
bus = simple_strtoul(optarg, NULL, 0);
break;
case 'v':
verbose = 1;
break;
}
}
count = argc - optind;
if ((addr < 0) || (reg < 0) || (count == 0) || (addr > 0x7F))
return COMMAND_ERROR_USAGE;
adapter = i2c_get_adapter(bus);
if (!adapter) {
printf("i2c bus %d not found\n", bus);
return -ENODEV;
}
client.adapter = adapter;
client.addr = addr;
buf = xmalloc(count);
for (i = 0; i < count; i++)
*(buf + i) = (char) simple_strtol(argv[optind+i], NULL, 16);
ret = i2c_write_reg(&client, reg, buf, count);
if (ret != count)
goto out;
ret = 0;
if (verbose) {
printf("wrote %i bytes starting at reg 0x%02x to i2cdev 0x%02x on bus %i\n",
count, reg, addr, adapter->nr);
for (i = 0; i < count; i++)
printf("0x%02x ", *(buf + i));
printf("\n");
}
out:
free(buf);
return ret;
}
static const __maybe_unused char cmd_i2c_write_help[] =
"Usage: i2c_write [OPTION] ... hexdatas\n"
"write to i2c device.\n"
" -a 0x<addr> i2c device address\n"
" -b <bus_num> i2c bus number (default = 0)\n"
" -r 0x<reg> start register\n";
BAREBOX_CMD_START(i2c_write)
.cmd = do_i2c_write,
.usage = "write to an i2c device",
BAREBOX_CMD_HELP(cmd_i2c_write_help)
BAREBOX_CMD_END
static int do_i2c_read(struct command *cmdtp, int argc, char *argv[])
{
struct i2c_adapter *adapter = NULL;
struct i2c_client client;
u8 *buf;
int count = -1, addr = -1, reg = -1, verbose = 0, ret, opt, bus = 0;
while ((opt = getopt(argc, argv, "a:b:c:r:v")) > 0) {
switch (opt) {
case 'a':
addr = simple_strtol(optarg, NULL, 0);
break;
case 'c':
count = simple_strtoul(optarg, NULL, 0);
break;
case 'b':
bus = simple_strtoul(optarg, NULL, 0);
break;
case 'r':
reg = simple_strtol(optarg, NULL, 0);
break;
case 'v':
verbose = 1;
break;
}
}
if ((addr < 0) || (reg < 0) || (count == 0) || (addr > 0x7F))
return COMMAND_ERROR_USAGE;
adapter = i2c_get_adapter(bus);
if (!adapter) {
printf("i2c bus %d not found\n", bus);
return -ENODEV;
}
client.adapter = adapter;
client.addr = addr;
buf = xmalloc(count);
ret = i2c_read_reg(&client, reg, buf, count);
if (ret == count) {
int i;
if (verbose)
printf("read %i bytes starting at reg 0x%02x from i2cdev 0x%02x on bus %i\n",
count, reg, addr, adapter->nr);
for (i = 0; i < count; i++)
printf("0x%02x ", *(buf + i));
printf("\n");
ret = 0;
}
free(buf);
return ret;
}
static const __maybe_unused char cmd_i2c_read_help[] =
"Usage: i2c_read [OPTION]\n"
"read i2c device.\n"
" -a 0x<addr> i2c device address\n"
" -b <bus_num> i2c bus number (default = 0)\n"
" -r 0x<reg> start register\n"
" -c <count> byte count\n";
BAREBOX_CMD_START(i2c_read)
.cmd = do_i2c_read,
.usage = "read from an i2c device",
BAREBOX_CMD_HELP(cmd_i2c_read_help)
BAREBOX_CMD_END
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