dm: Move the function for getting GPIO status into the uclass

This function can be more easily tested if it is in the uclass.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/cmd_gpio.c

@@ -25,13 +25,6 @@ enum gpio_cmd {
 };
 
 #if defined(CONFIG_DM_GPIO) && !defined(gpio_status)
-static const char * const gpio_function[GPIOF_COUNT] = {
-	"input",
-	"output",
-	"unused",
-	"unknown",
-	"func",
-};
 
 /* A few flags used by show_gpio() */
 enum {
@@ -40,22 +33,16 @@ enum {
 	FLAG_SHOW_NEWLINE	= 1 << 2,
 };
 
-static void show_gpio(struct udevice *dev, const char *bank_name, int offset,
-		      int *flagsp)
+static void gpio_get_description(struct udevice *dev, const char *bank_name,
+				 int offset, int *flagsp)
 {
-	struct dm_gpio_ops *ops = gpio_get_ops(dev);
-	int func = GPIOF_UNKNOWN;
 	char buf[80];
 	int ret;
 
-	BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
-
-	if (ops->get_function) {
-		ret = ops->get_function(dev, offset);
-		if (ret >= 0 && ret < ARRAY_SIZE(gpio_function))
-			func = ret;
-	}
-	if (!(*flagsp & FLAG_SHOW_ALL) && func == GPIOF_UNUSED)
+	ret = gpio_get_function(dev, offset, NULL);
+	if (ret < 0)
+		goto err;
+	if (!(*flagsp & FLAG_SHOW_ALL) && ret == GPIOF_UNUSED)
 		return;
 	if ((*flagsp & FLAG_SHOW_BANK) && bank_name) {
 		if (*flagsp & FLAG_SHOW_NEWLINE) {
@@ -65,20 +52,15 @@ static void show_gpio(struct udevice *dev, const char *bank_name, int offset,
 		printf("Bank %s:\n", bank_name);
 		*flagsp &= ~FLAG_SHOW_BANK;
 	}
-	*buf = '\0';
-	if (ops->get_state) {
-		ret = ops->get_state(dev, offset, buf, sizeof(buf));
-		if (ret) {
-			puts("<unknown>");
-			return;
-		}
-	} else {
-		sprintf(buf, "%s%u: %8s %d", bank_name, offset,
-			gpio_function[func], ops->get_value(dev, offset));
-	}
 
-	puts(buf);
-	puts("\n");
+	ret = gpio_get_status(dev, offset, buf, sizeof(buf));
+	if (ret)
+		goto err;
+
+	printf("%s\n", buf);
+	return;
+err:
+	printf("Error %d\n", ret);
 }
 
 static int do_gpio_status(bool all, const char *gpio_name)
@@ -101,8 +83,10 @@ static int do_gpio_status(bool all, const char *gpio_name)
 		if (all)
 			flags |= FLAG_SHOW_ALL;
 		bank_name = gpio_get_bank_info(dev, &num_bits);
-		if (!num_bits)
+		if (!num_bits) {
+			debug("GPIO device %s has no bits\n", dev->name);
 			continue;
+		}
 		banklen = bank_name ? strlen(bank_name) : 0;
 
 		if (!gpio_name || !bank_name ||
@@ -113,11 +97,12 @@ static int do_gpio_status(bool all, const char *gpio_name)
 			p = gpio_name + banklen;
 			if (gpio_name && *p) {
 				offset = simple_strtoul(p, NULL, 10);
-				show_gpio(dev, bank_name, offset, &flags);
+				gpio_get_description(dev, bank_name, offset,
+						     &flags);
 			} else {
 				for (offset = 0; offset < num_bits; offset++) {
-					show_gpio(dev, bank_name, offset,
-						  &flags);
+					gpio_get_description(dev, bank_name,
+							     offset, &flags);
 				}
 			}
 		}

drivers/gpio/gpio-uclass.c

@@ -330,6 +330,45 @@ int gpio_get_raw_function(struct udevice *dev, int offset, const char **namep)
 	return get_function(dev, offset, false, namep);
 }
 
+int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize)
+{
+	struct dm_gpio_ops *ops = gpio_get_ops(dev);
+	struct gpio_dev_priv *priv;
+	char *str = buf;
+	int func;
+	int ret;
+	int len;
+
+	BUILD_BUG_ON(GPIOF_COUNT != ARRAY_SIZE(gpio_function));
+
+	*buf = 0;
+	priv = dev->uclass_priv;
+	ret = gpio_get_raw_function(dev, offset, NULL);
+	if (ret < 0)
+		return ret;
+	func = ret;
+	len = snprintf(str, buffsize, "%s%d: %s",
+		       priv->bank_name ? priv->bank_name : "",
+		       offset, gpio_function[func]);
+	if (func == GPIOF_INPUT || func == GPIOF_OUTPUT ||
+	    func == GPIOF_UNUSED) {
+		const char *label;
+		bool used;
+
+		ret = ops->get_value(dev, offset);
+		if (ret < 0)
+			return ret;
+		used = gpio_get_function(dev, offset, &label) != GPIOF_UNUSED;
+		snprintf(str + len, buffsize - len, ": %d [%c]%s%s",
+			 ret,
+			 used ? 'x' : ' ',
+			 used ? " " : "",
+			 label ? label : "");
+	}
+
+	return 0;
+}
+
 /* We need to renumber the GPIOs when any driver is probed/removed */
 static int gpio_renumber(struct udevice *removed_dev)
 {

include/asm-generic/gpio.h

@@ -96,6 +96,24 @@ enum gpio_func_t {
 struct udevice;
 
 /**
+ * gpio_get_status() - get the current GPIO status as a string
+ *
+ * Obtain the current GPIO status as a string which can be presented to the
+ * user. A typical string is:
+ *
+ * "b4:  in: 1 [x] sdmmc_cd"
+ *
+ * which means this is GPIO bank b, offset 4, currently set to input, current
+ * value 1, [x] means that it is requested and the owner is 'sdmmc_cd'
+ *
+ * @dev:	Device to check
+ * @offset:	Offset of device GPIO to check
+ * @buf:	Place to put string
+ * @buffsize:	Size of string including \0
+ */
+int gpio_get_status(struct udevice *dev, int offset, char *buf, int buffsize);
+
+/**
  * gpio_get_function() - get the current function for a GPIO pin
  *
  * Note this returns GPIOF_UNUSED if the GPIO is not requested.