Initial commitHEADsubmit/tizen_common/20150126.093738submit/tizen_3.0_common/20161104.104000submit/2.0alpha/20130201.222745accepted/tizen/common/20150126.100451accepted/tizen/3.0/common/20161114.112238accepted/2.0alpha/20130201.222208tizen_3.0.m2tizen_3.0.2015.q2_commontizen_3.0.2014.q4_commonaccepted/tizen_commonaccepted/tizen_3.0_common2.0alpha

1 files changed, 256 insertions, 0 deletions

diff --git a/tools/i2cget.c b/tools/i2cget.c
new file mode 100644
index 0000000..32a68e5
--- /dev/null
+++ b/tools/i2cget.c
@@ -0,0 +1,256 @@
+/*
+    i2cget.c - A user-space program to read an I2C register.
+    Copyright (C) 2005-2008  Jean Delvare <khali@linux-fr.org>
+
+    Based on i2cset.c:
+    Copyright (C) 2001-2003  Frodo Looijaard <frodol@dds.nl>, and
+                             Mark D. Studebaker <mdsxyz123@yahoo.com>
+    Copyright (C) 2004-2005  Jean Delvare <khali@linux-fr.org>
+
+    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., 51 Franklin Street, Fifth Floor, Boston,
+    MA 02110-1301 USA.
+*/
+
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/i2c-dev.h>
+#include "i2cbusses.h"
+#include "util.h"
+#include "../version.h"
+
+static void help(void) __attribute__ ((noreturn));
+
+static void help(void)
+{
+	fprintf(stderr,
+		"Usage: i2cget [-f] [-y] I2CBUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]\n"
+		"  I2CBUS is an integer or an I2C bus name\n"
+		"  ADDRESS is an integer (0x03 - 0x77)\n"
+		"  MODE is one of:\n"
+		"    b (read byte data, default)\n"
+		"    w (read word data)\n"
+		"    c (write byte/read byte)\n"
+		"    Append p for SMBus PEC\n");
+	exit(1);
+}
+
+static int check_funcs(int file, int size, int daddress, int pec)
+{
+	unsigned long funcs;
+
+	/* check adapter functionality */
+	if (ioctl(file, I2C_FUNCS, &funcs) < 0) {
+		fprintf(stderr, "Error: Could not get the adapter "
+			"functionality matrix: %s\n", strerror(errno));
+		return -1;
+	}
+
+	switch (size) {
+	case I2C_SMBUS_BYTE:
+		if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE)) {
+			fprintf(stderr, MISSING_FUNC_FMT, "SMBus receive byte");
+			return -1;
+		}
+		if (daddress >= 0
+		 && !(funcs & I2C_FUNC_SMBUS_WRITE_BYTE)) {
+			fprintf(stderr, MISSING_FUNC_FMT, "SMBus send byte");
+			return -1;
+		}
+		break;
+
+	case I2C_SMBUS_BYTE_DATA:
+		if (!(funcs & I2C_FUNC_SMBUS_READ_BYTE_DATA)) {
+			fprintf(stderr, MISSING_FUNC_FMT, "SMBus read byte");
+			return -1;
+		}
+		break;
+
+	case I2C_SMBUS_WORD_DATA:
+		if (!(funcs & I2C_FUNC_SMBUS_READ_WORD_DATA)) {
+			fprintf(stderr, MISSING_FUNC_FMT, "SMBus read word");
+			return -1;
+		}
+		break;
+	}
+
+	if (pec
+	 && !(funcs & (I2C_FUNC_SMBUS_PEC | I2C_FUNC_I2C))) {
+		fprintf(stderr, "Warning: Adapter does "
+			"not seem to support PEC\n");
+	}
+
+	return 0;
+}
+
+static int confirm(const char *filename, int address, int size, int daddress,
+		   int pec)
+{
+	int dont = 0;
+
+	fprintf(stderr, "WARNING! This program can confuse your I2C "
+		"bus, cause data loss and worse!\n");
+
+	/* Don't let the user break his/her EEPROMs */
+	if (address >= 0x50 && address <= 0x57 && pec) {
+		fprintf(stderr, "STOP! EEPROMs are I2C devices, not "
+			"SMBus devices. Using PEC\non I2C devices may "
+			"result in unexpected results, such as\n"
+			"trashing the contents of EEPROMs. We can't "
+			"let you do that, sorry.\n");
+		return 0;
+	}
+
+	if (size == I2C_SMBUS_BYTE && daddress >= 0 && pec) {
+		fprintf(stderr, "WARNING! All I2C chips and some SMBus chips "
+			"will interpret a write\nbyte command with PEC as a"
+			"write byte data command, effectively writing a\n"
+			"value into a register!\n");
+		dont++;
+	}
+
+	fprintf(stderr, "I will read from device file %s, chip "
+		"address 0x%02x, ", filename, address);
+	if (daddress < 0)
+		fprintf(stderr, "current data\naddress");
+	else
+		fprintf(stderr, "data address\n0x%02x", daddress);
+	fprintf(stderr, ", using %s.\n",
+		size == I2C_SMBUS_BYTE ? (daddress < 0 ?
+		"read byte" : "write byte/read byte") :
+		size == I2C_SMBUS_BYTE_DATA ? "read byte data" :
+		"read word data");
+	if (pec)
+		fprintf(stderr, "PEC checking enabled.\n");
+
+	fprintf(stderr, "Continue? [%s] ", dont ? "y/N" : "Y/n");
+	fflush(stderr);
+	if (!user_ack(!dont)) {
+		fprintf(stderr, "Aborting on user request.\n");
+		return 0;
+	}
+
+	return 1;
+}
+
+int main(int argc, char *argv[])
+{
+	char *end;
+	int res, i2cbus, address, size, file;
+	int daddress;
+	char filename[20];
+	int pec = 0;
+	int flags = 0;
+	int force = 0, yes = 0, version = 0;
+
+	/* handle (optional) flags first */
+	while (1+flags < argc && argv[1+flags][0] == '-') {
+		switch (argv[1+flags][1]) {
+		case 'V': version = 1; break;
+		case 'f': force = 1; break;
+		case 'y': yes = 1; break;
+		default:
+			fprintf(stderr, "Error: Unsupported option "
+				"\"%s\"!\n", argv[1+flags]);
+			help();
+			exit(1);
+		}
+		flags++;
+	}
+
+	if (version) {
+		fprintf(stderr, "i2cget version %s\n", VERSION);
+		exit(0);
+	}
+
+	if (argc < flags + 3)
+		help();
+
+	i2cbus = lookup_i2c_bus(argv[flags+1]);
+	if (i2cbus < 0)
+		help();
+
+	address = parse_i2c_address(argv[flags+2]);
+	if (address < 0)
+		help();
+
+	if (argc > flags + 3) {
+		size = I2C_SMBUS_BYTE_DATA;
+		daddress = strtol(argv[flags+3], &end, 0);
+		if (*end || daddress < 0 || daddress > 0xff) {
+			fprintf(stderr, "Error: Data address invalid!\n");
+			help();
+		}
+	} else {
+		size = I2C_SMBUS_BYTE;
+		daddress = -1;
+	}
+
+	if (argc > flags + 4) {
+		switch (argv[flags+4][0]) {
+		case 'b': size = I2C_SMBUS_BYTE_DATA; break;
+		case 'w': size = I2C_SMBUS_WORD_DATA; break;
+		case 'c': size = I2C_SMBUS_BYTE; break;
+		default:
+			fprintf(stderr, "Error: Invalid mode!\n");
+			help();
+		}
+		pec = argv[flags+4][1] == 'p';
+	}
+
+	file = open_i2c_dev(i2cbus, filename, 0);
+	if (file < 0
+	 || check_funcs(file, size, daddress, pec)
+	 || set_slave_addr(file, address, force))
+		exit(1);
+
+	if (!yes && !confirm(filename, address, size, daddress, pec))
+		exit(0);
+
+	if (pec && ioctl(file, I2C_PEC, 1) < 0) {
+		fprintf(stderr, "Error: Could not set PEC: %s\n",
+			strerror(errno));
+		close(file);
+		exit(1);
+	}
+
+	switch (size) {
+	case I2C_SMBUS_BYTE:
+		if (daddress >= 0) {
+			res = i2c_smbus_write_byte(file, daddress);
+			if (res < 0)
+				fprintf(stderr, "Warning - write failed\n");
+		}
+		res = i2c_smbus_read_byte(file);
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		res = i2c_smbus_read_word_data(file, daddress);
+		break;
+	default: /* I2C_SMBUS_BYTE_DATA */
+		res = i2c_smbus_read_byte_data(file, daddress);
+	}
+	close(file);
+
+	if (res < 0) {
+		fprintf(stderr, "Error: Read failed\n");
+		exit(2);
+	}
+
+	printf("0x%0*x\n", size == I2C_SMBUS_WORD_DATA ? 4 : 2, res);
+
+	exit(0);
+}