theses commands allow low level access to i2c bus and can be useful
to setup an i2c device without having to add code, compile and flash
barebox.
Signed-off-by: Eric Bénard <eric@xxxxxxxxxx>
---
commands/Kconfig | 8 ++
commands/Makefile | 1 +
commands/i2c.c | 233 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 242 insertions(+), 0 deletions(-)
create mode 100644 commands/i2c.c
diff --git a/commands/Kconfig b/commands/Kconfig
index 0c09f91..7115b18 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -314,4 +314,12 @@ config CMD_UNLZO
Say yes here to get the unlzo command. lzo is a fast compression
algorithm by Markus Franz Xaver Johannes Oberhumer.
+config CMD_I2C
+ bool
+ depends on DRIVER_I2C_I2CDEV
+ prompt "i2c commands"
+ help
+ include i2c_probe, i2c_read and i2c_write commands to communicate
+ on i2c bus.
+
endmenu
diff --git a/commands/Makefile b/commands/Makefile
index 74b0994..3eef5de 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -48,3 +48,4 @@ obj-$(CONFIG_CMD_BMP) += bmp.o
obj-$(CONFIG_USB_GADGET_DFU) += dfu.o
obj-$(CONFIG_CMD_GPIO) += gpio.o
obj-$(CONFIG_CMD_UNLZO) += unlzo.o
+obj-$(CONFIG_CMD_I2C) += i2c.o
diff --git a/commands/i2c.c b/commands/i2c.c
new file mode 100644
index 0000000..b4152eb
--- /dev/null
+++ b/commands/i2c.c
@@ -0,0 +1,233 @@
+/*
+ * i2c.c - i2c commands
+ *
+ * Copyright (c) 2010 Eric Bénard <eric@xxxxxxxxxx>, Eukréa Electromatique
+ *
+ * originals hex1_bin and hex2_bin are
+ * (C) Copyright 2000 Wolfgang Denk, DENX Software Engineering, wd@xxxxxxxx
+ *
+ * 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>
+
+struct i2c_client *client;
+extern struct i2c_client *i2cdev_get_client(void);
+
+static int hex1_bin(char c)
+{
+ if (c >= '0' && c <= '9')
+ return c - '0';
+ if (c >= 'a' && c <= 'f')
+ return c + 10 - 'a';
+ if (c >= 'A' && c <= 'F')
+ return c + 10 - 'A';
+ return -1;
+}
+
+static int hex2_bin(char *s)
+{
+ int i, j;
+
+ if (*s == '0' && (*(s+1) == 'x'))
+ s += 2;
+ i = hex1_bin(*s++);
+ if (i < 0)
+ return -1;
+ j = hex1_bin(*s);
+ if (j < 0)
+ return -1;
+ return (i<<4) + j;
+}
+
+static int do_i2c_probe(struct command *cmdtp, int argc, char *argv[])
+{
+ struct i2c_client *client;
+ int startaddr = -1, stopaddr = -1, addr, ret;
+ u8 reg;
+
+ if (argc < 3)
+ return COMMAND_ERROR_USAGE;
+
+ startaddr = hex2_bin(argv[1]);
+ stopaddr = hex2_bin(argv[2]);
+ if ((startaddr == -1) || (stopaddr == -1))
+ return COMMAND_ERROR_USAGE;
+
+ client = i2cdev_get_client();
+ if (!client)
+ return -ENODEV;
+
+ 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 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_client *client;
+ int addr = -1, reg = -1, count = -1, ret, opt;
+ void *buf = NULL;
+
+ if (argc < 5)
+ return COMMAND_ERROR_USAGE;
+
+ while ((opt = getopt(argc, argv, "a:c:r:")) > 0) {
+ switch (opt) {
+ case 'a':
+ addr = hex2_bin(optarg);
+ if (addr < 0)
+ return COMMAND_ERROR_USAGE;
+ break;
+ case 'c':
+ count = simple_strtoul(optarg, NULL, 0);
+ break;
+ case 'r':
+ reg = hex2_bin(optarg);
+ if (reg < 0)
+ return COMMAND_ERROR_USAGE;
+ break;
+ }
+ }
+ if ((argc - optind) != count)
+ return COMMAND_ERROR_USAGE;
+
+ client = i2cdev_get_client();
+ if (!client)
+ return -ENODEV;
+ client->addr = addr;
+
+ buf = malloc(count);
+ if (buf) {
+ int i;
+ u8 tmp;
+ for (i = 0; i < count; i++) {
+ tmp = hex2_bin(argv[optind+i]);
+ if (tmp < 1) {
+ free(buf);
+ return COMMAND_ERROR_USAGE;
+ }
+ *(u8 *) (buf + i) = tmp;
+ }
+ ret = i2c_write_reg(client, reg, buf, count);
+ if (ret != count) {
+ free(buf);
+ return ret;
+ }
+ free(buf);
+ printf("wrote %i bytes starting at reg 0x%02x to i2cdev \
+ 0x%02x\n", count, reg, addr);
+ return 0;
+ }
+ return 1;
+}
+
+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"
+" -r 0x<reg> start register\n"
+" -c <count> byte number to write\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_client *client;
+ void *buf = NULL;
+ int count = -1, addr = -1, reg = -1, ret, opt;
+
+ if (argc < 4)
+ return COMMAND_ERROR_USAGE;
+
+ while ((opt = getopt(argc, argv, "a:c:r:")) > 0) {
+ switch (opt) {
+ case 'a':
+ addr = hex2_bin(optarg);
+ if (addr < 0)
+ return COMMAND_ERROR_USAGE;
+ break;
+ case 'c':
+ count = simple_strtoul(optarg, NULL, 0);
+ break;
+ case 'r':
+ reg = hex2_bin(optarg);
+ if (reg < 0)
+ return COMMAND_ERROR_USAGE;
+ break;
+ }
+ }
+
+ client = i2cdev_get_client();
+ if (!client)
+ return -ENODEV;
+ client->addr = addr;
+
+ buf = malloc(count);
+ if (buf) {
+ ret = i2c_read_reg(client, reg, buf, count);
+ if (ret == count) {
+ int i;
+ printf("read %i bytes starting at reg 0x%02x from \
+ i2cdev 0x%02x\n", count, reg, addr);
+ for (i = 0; i < count; i++)
+ printf("0x%02x ", *(u8 *) (buf + i));
+ printf("\n");
+ free(buf);
+ return 0;
+ }
+ free(buf);
+ }
+ return 1;
+}
+
+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"
+" -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
--
1.6.3.3
_______________________________________________
barebox mailing list
barebox@xxxxxxxxxxxxxxxxxxx
http://lists.infradead.org/mailman/listinfo/barebox
