ectool: add new parameter to identify proper EC.

Add parameter name to identify which EC to talk to.
Superseed --dev parameter, removed soon.

--name cros_ec (the default): send commands to /dev/cros_ec.
--name cros_pd: send commands to /dev/cros_pd.
...

BUG=chrome-os-partner:31513
TEST=Tested on samus:
check ectool --name cros_pd version returns proper data:
ectool --name=cros_pd version
RO version:    samus_pd_v1.1.2079-8e4f9fc-dirt
....

CQ-DEPEND=CL:217297
BRANCH=ToT

Change-Id: Ie8b5c6c184d73a89b4445e88d6f104169176b9f3
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/217311
Reviewed-by: Randall Spangler <rspangler@chromium.org>

util/burn_my_ec.c

@@ -130,7 +130,7 @@ int main(int argc, char *argv[])
 {
 	extern uint8_t data[] asm("_payload_start");
 
-	if (comm_init(COMM_ALL) < 0)
+	if (comm_init(COMM_ALL, NULL) < 0)
 		return -3;
 
 	flash_partition(EC_IMAGE_RW, data + CONFIG_FW_RW_OFF,

util/comm-dev.c

@@ -78,13 +78,15 @@ static int ec_readmem_dev(int offset, int bytes, void *dest)
 			      dest, bytes);
 }
 
-int comm_init_dev(void)
+int comm_init_dev(const char *device_name)
 {
 	char version[80];
+	char device[80] = "/dev/";
 	int r;
 	char *s;
 
-	fd = open("/dev/" CROS_EC_DEV_NAME, O_RDWR);
+	strncat(device, (device_name ? device_name : CROS_EC_DEV_NAME), 40);
+	fd = open(device, O_RDWR);
 	if (fd < 0)
 		return 1;
 

util/comm-host.c

@@ -23,7 +23,7 @@ void *ec_outbuf;
 void *ec_inbuf;
 static int command_offset;
 
-int comm_init_dev(void) __attribute__((weak));
+int comm_init_dev(const char *device_name) __attribute__((weak));
 int comm_init_lpc(void) __attribute__((weak));
 int comm_init_i2c(void) __attribute__((weak));
 
@@ -75,7 +75,7 @@ int ec_command(int command, int version,
 				indata, insize);
 }
 
-int comm_init(int interfaces)
+int comm_init(int interfaces, const char *device_name)
 {
 	struct ec_response_get_protocol_info info;
 
@@ -83,7 +83,8 @@ int comm_init(int interfaces)
 	ec_readmem = fake_readmem;
 
 	/* Prefer new /dev method */
-	if ((interfaces & COMM_DEV) && comm_init_dev && !comm_init_dev())
+	if ((interfaces & COMM_DEV) && comm_init_dev &&
+	    !comm_init_dev(device_name))
 		goto init_ok;
 
 	/* Fallback to direct LPC on x86 */

util/comm-host.h

@@ -37,9 +37,10 @@ enum comm_interface {
  * Perform initializations needed for subsequent requests
  *
  * @param interfaces	Interfaces to try; use COMM_ALL to try all of them.
+ * @param device_name For DEV option, the device file to use.
  * @return 0 in case of success, or error code.
  */
-int comm_init(int interfaces);
+int comm_init(int interfaces, const char *device_name);
 
 /**
  * Send a command to the EC.  Returns the length of output data returned (0 if

util/ec_sb_firmware_update.c

@@ -635,7 +635,7 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	if (comm_init(interfaces)) {
+	if (comm_init(interfaces, NULL)) {
 		fprintf(stderr, "Couldn't find EC\n");
 		goto out;
 	}

util/ectool.c

@@ -29,11 +29,13 @@
 enum {
 	OPT_DEV = 1000,
 	OPT_INTERFACE,
+	OPT_NAME,
 };
 
 static struct option long_opts[] = {
 	{"dev", 1, 0, OPT_DEV},
 	{"interface", 1, 0, OPT_INTERFACE},
+	{"name", 1, 0, OPT_NAME},
 	{NULL, 0, 0, 0}
 };
 
@@ -228,9 +230,8 @@ int parse_bool(const char *s, int *dest)
 
 void print_help(const char *prog, int print_cmds)
 {
-	printf("Usage: %s [--dev=n] [--interface=dev|lpc|i2c] <command> "
-	       "[params]\n\n",
-	       prog);
+	printf("Usage: %s [--dev=n] [--interface=dev|lpc|i2c] ", prog);
+	printf("[--name=cros_ec|cros_sh|cros_pd] <command> [params]\n\n");
 	if (print_cmds)
 		puts(help_str);
 	else
@@ -4839,6 +4840,7 @@ int main(int argc, char *argv[])
 	const struct command *cmd;
 	int dev = 0;
 	int interfaces = COMM_ALL;
+	char device_name[40] = "cros_ec";
 	int rv = 1;
 	int parse_error = 0;
 	char *e;
@@ -4873,6 +4875,9 @@ int main(int argc, char *argv[])
 				parse_error = 1;
 			}
 			break;
+		case OPT_NAME:
+			strncpy(device_name, optarg, 40);
+			break;
 		}
 	}
 
@@ -4904,7 +4909,7 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
-	if (comm_init(interfaces)) {
+	if (comm_init(interfaces, device_name)) {
 		fprintf(stderr, "Couldn't find EC\n");
 		goto out;
 	}