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| author | Aleksander Morgado <aleksander@aleksander.es> | 2018-08-21 17:18:26 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2018-08-22 09:36:58 +0200 |
| commit | 079f92099a694544a04e619a3748da3defe4f4b4 (patch) | |
| tree | 602ca2145b9ee92909fb57ce748e88e67b67e835 /commands/i2c.c | |
| parent | 0657fdc4cdc847c3f3bdc567405c1d115fc54ba2 (diff) | |
| download | barebox-079f92099a694544a04e619a3748da3defe4f4b4.tar.gz barebox-079f92099a694544a04e619a3748da3defe4f4b4.tar.xz | |
i2c_read: implement support for master receive mode
If no start register is explicitly given, receive data in master
receive mode.
Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/i2c.c')
| -rw-r--r-- | commands/i2c.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/commands/i2c.c b/commands/i2c.c index 57dc092c2f..2f7f820d4d 100644 --- a/commands/i2c.c +++ b/commands/i2c.c @@ -208,7 +208,7 @@ static int do_i2c_read(int argc, char *argv[]) } } - if ((addr < 0) || (reg < 0) || (count < 1) || (addr > 0x7F)) + if ((addr < 0) || (count < 1) || (addr > 0x7F)) return COMMAND_ERROR_USAGE; adapter = i2c_get_adapter(bus); @@ -221,12 +221,21 @@ static int do_i2c_read(int argc, char *argv[]) client.addr = addr; buf = xmalloc(count); - ret = i2c_read_reg(&client, reg | wide, buf, count); + if (reg >= 0) + ret = i2c_read_reg(&client, reg | wide, buf, count); + else + ret = i2c_master_recv(&client, buf, count); if (ret == count) { int i; - if (verbose) - printf("read %i bytes starting at reg 0x%04x from i2cdev 0x%02x on bus %i\n", - count, reg, addr, adapter->nr); + if (verbose) { + if (reg >= 0) + printf("read %i bytes starting at reg 0x%04x from i2cdev 0x%02x on bus %i\n", + count, reg, addr, adapter->nr); + else + printf("received %i bytes in master receive mode from i2cdev 0x%02x on bus %i\n", + count, addr, adapter->nr); + } + for (i = 0; i < count; i++) printf("0x%02x ", *(buf + i)); printf("\n"); @@ -241,7 +250,7 @@ BAREBOX_CMD_HELP_START(i2c_read) BAREBOX_CMD_HELP_TEXT("Options:") BAREBOX_CMD_HELP_OPT("-b BUS\t", "i2c bus number (default 0)") BAREBOX_CMD_HELP_OPT("-a ADDR\t", "i2c device address") -BAREBOX_CMD_HELP_OPT("-r START", "start register") +BAREBOX_CMD_HELP_OPT("-r START", "start register (optional, master receive mode if none given)") BAREBOX_CMD_HELP_OPT("-w\t", "use word (16 bit) wide access") BAREBOX_CMD_HELP_OPT("-c COUNT", "byte count") BAREBOX_CMD_HELP_OPT("-v\t", "verbose") |