dm: gpio: Add error handling and a function to claim vector GPIOs

gpio_get_values_as_int() should return an error if something goes wrong.
Also provide gpio_claim_vector(), a function to request the GPIOs and set
them to input mode. Otherwise callers have to do this themselves.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

drivers/gpio/gpio-uclass.c

@@ -495,22 +495,54 @@ int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
 	return 0;
 }
 
+int gpio_claim_vector(const int *gpio_num_array, const char *fmt)
+{
+	int i, ret;
+	int gpio;
+
+	for (i = 0; i < 32; i++) {
+		gpio = gpio_num_array[i];
+		if (gpio == -1)
+			break;
+		ret = gpio_requestf(gpio, fmt, i);
+		if (ret)
+			goto err;
+		ret = gpio_direction_input(gpio);
+		if (ret) {
+			gpio_free(gpio);
+			goto err;
+		}
+	}
+
+	return 0;
+err:
+	for (i--; i >= 0; i--)
+		gpio_free(gpio_num_array[i]);
+
+	return ret;
+}
+
 /*
  * get a number comprised of multiple GPIO values. gpio_num_array points to
  * the array of gpio pin numbers to scan, terminated by -1.
  */
-unsigned gpio_get_values_as_int(const int *gpio_num_array)
+int gpio_get_values_as_int(const int *gpio_list)
 {
 	int gpio;
 	unsigned bitmask = 1;
 	unsigned vector = 0;
+	int ret;
 
 	while (bitmask &&
-	       ((gpio = *gpio_num_array++) != -1)) {
-		if (gpio_get_value(gpio))
+	       ((gpio = *gpio_list++) != -1)) {
+		ret = gpio_get_value(gpio);
+		if (ret < 0)
+			return ret;
+		else if (ret)
 			vector |= bitmask;
 		bitmask <<= 1;
 	}
+
 	return vector;
 }
 

include/asm-generic/gpio.h

@@ -336,15 +336,24 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
 		     unsigned int *offsetp, unsigned int *gpiop);
 
 /**
- * get_gpios() - Turn the values of a list of GPIOs into an integer
+ * gpio_get_values_as_int() - Turn the values of a list of GPIOs into an int
  *
  * This puts the value of the first GPIO into bit 0, the second into bit 1,
  * etc. then returns the resulting integer.
  *
  * @gpio_list: List of GPIOs to collect
- * @return resulting integer value
+ * @return resulting integer value, or -ve on error
  */
-unsigned gpio_get_values_as_int(const int *gpio_list);
+int gpio_get_values_as_int(const int *gpio_list);
+
+/**
+ * gpio_claim_vector() - claim a number of GPIOs for input
+ *
+ * @gpio_num_array:	array of gpios to claim, terminated by -1
+ * @fmt:		format string for GPIO names, e.g. "board_id%d"
+ * @return 0 if OK, -ve on error
+ */
+int gpio_claim_vector(const int *gpio_num_array, const char *fmt);
 
 /**
  * gpio_request_by_name() - Locate and request a GPIO by name