X-Git-Url: https://review.openocd.org/gitweb?a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fsysfsgpio.c;h=5a4651df194b85f9a3e38ba714422b992678085a;hb=f2b228f5d1728b9972624c1a7ae681fc6df2cddc;hp=d822562a5e5953d2af3ba8999d367d2b4648f515;hpb=e290cb76c8d5abfe3929dc9436b936708684d989;p=openocd.git

diff --git a/src/jtag/drivers/sysfsgpio.c b/src/jtag/drivers/sysfsgpio.c
index d822562a5e..5a4651df19 100644
--- a/src/jtag/drivers/sysfsgpio.c
+++ b/src/jtag/drivers/sysfsgpio.c
@@ -12,9 +12,7 @@
  *   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.           *
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  ***************************************************************************/
 
 /* 2014-12: Addition of the SWD protocol support is based on the initial work
@@ -210,7 +208,7 @@ static int sysfsgpio_swdio_read(void)
 		return 0;
 	}
 
-	return buf[0] == '1';
+	return buf[0] != '0';
 }
 
 static void sysfsgpio_swdio_write(int swclk, int swdio)
@@ -246,7 +244,7 @@ static void sysfsgpio_swdio_write(int swclk, int swdio)
  * The sysfs value will read back either '0' or '1'. The trick here is to call
  * lseek to bypass buffering in the sysfs kernel driver.
  */
-static int sysfsgpio_read(void)
+static bb_value_t sysfsgpio_read(void)
 {
 	char buf[1];
 
@@ -259,7 +257,7 @@ static int sysfsgpio_read(void)
 		return 0;
 	}
 
-	return buf[0] == '1';
+	return buf[0] == '0' ? BB_LOW : BB_HIGH;
 }
 
 /*
@@ -268,11 +266,11 @@ static int sysfsgpio_read(void)
  * Seeing as this is the only function where the outputs are changed,
  * we can cache the old value to avoid needlessly writing it.
  */
-static void sysfsgpio_write(int tck, int tms, int tdi)
+static int sysfsgpio_write(int tck, int tms, int tdi)
 {
 	if (swd_mode) {
 		sysfsgpio_swdio_write(tck, tdi);
-		return;
+		return ERROR_OK;
 	}
 
 	const char one[] = "1";
@@ -314,6 +312,8 @@ static void sysfsgpio_write(int tck, int tms, int tdi)
 	last_tdi = tdi;
 	last_tms = tms;
 	last_tck = tck;
+
+	return ERROR_OK;
 }
 
 /*
@@ -321,7 +321,7 @@ static void sysfsgpio_write(int tck, int tms, int tdi)
  *
  * (1) assert or (0) deassert reset lines
  */
-static void sysfsgpio_reset(int trst, int srst)
+static int sysfsgpio_reset(int trst, int srst)
 {
 	LOG_DEBUG("sysfsgpio_reset");
 	const char one[] = "1";
@@ -341,6 +341,8 @@ static void sysfsgpio_reset(int trst, int srst)
 		if (bytes_written != 1)
 			LOG_WARNING("writing trst failed");
 	}
+
+	return ERROR_OK;
 }
 
 COMMAND_HANDLER(sysfsgpio_handle_jtag_gpionums)
@@ -594,10 +596,6 @@ static int sysfsgpio_init(void)
 			LOG_INFO("JTAG and SWD modes enabled");
 		else
 			LOG_INFO("JTAG only mode enabled (specify swclk and swdio gpio to add SWD mode)");
-		if (!is_gpio_valid(trst_gpio) && !is_gpio_valid(srst_gpio)) {
-			LOG_ERROR("Require at least one of trst or srst gpios to be specified");
-			return ERROR_JTAG_INIT_FAILED;
-		}
 	} else if (sysfsgpio_swd_mode_possible()) {
 		LOG_INFO("SWD only mode enabled (specify tck, tms, tdi and tdo gpios to add JTAG mode)");
 	} else {
@@ -663,9 +661,9 @@ static int sysfsgpio_init(void)
 
 	if (sysfsgpio_swd_mode_possible()) {
 		if (swd_mode)
-			bitbang_swd_switch_seq(NULL, JTAG_TO_SWD);
+			bitbang_swd_switch_seq(JTAG_TO_SWD);
 		else
-			bitbang_swd_switch_seq(NULL, SWD_TO_JTAG);
+			bitbang_swd_switch_seq(SWD_TO_JTAG);
 	}
 
 	return ERROR_OK;