staging: speakup: use native error codes

The mapping as follows:
	E_RANGE		-> ERANGE
	E_UNDEF		-> ENODATA
	E_TOOLONG	-> E2BIG
	SET_DEFAULT	-> ERESTART

As a side effect it fixes a bug in spk_var_store() where return code was
mistakenly compared to negative value instead of positive.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/kobjects.c

@@ -619,7 +619,7 @@ ssize_t spk_var_store(struct kobject *kobj, struct kobj_attribute *attr,
 			len = E_SET;
 		value = simple_strtol(cp, NULL, 10);
 		ret = spk_set_num_var(value, param, len);
-		if (ret == E_RANGE) {
+		if (ret == -ERANGE) {
 			var_data = param->data;
 			pr_warn("value for %s out of range, expect %d to %d\n",
 				attr->attr.name,
@@ -637,7 +637,7 @@ ssize_t spk_var_store(struct kobject *kobj, struct kobj_attribute *attr,
 		cp = (char *) buf;
 		cp[len] = '\0';
 		ret = spk_set_string_var(buf, param, len);
-		if (ret == E_TOOLONG)
+		if (ret == -E2BIG)
 			pr_warn("value too long for %s\n",
 					attr->attr.name);
 		break;
@@ -670,7 +670,7 @@ ssize_t spk_var_store(struct kobject *kobj, struct kobj_attribute *attr,
 	}
 	spk_unlock(flags);
 
-	if (ret == SET_DEFAULT)
+	if (ret == -ERESTART)
 		pr_info("%s reset to default value\n", attr->attr.name);
 	return count;
 }

drivers/staging/speakup/speakup.h

@@ -44,11 +44,6 @@
 #define IS_CHAR(x, type) (spk_chartab[((u_char)x)]&type)
 #define IS_TYPE(x, type) ((spk_chartab[((u_char)x)]&type) == type)
 
-#define SET_DEFAULT -4
-#define E_RANGE -3
-#define E_TOOLONG -2
-#define E_UNDEF -1
-
 extern int speakup_thread(void *data);
 extern void spk_reset_default_chars(void);
 extern void spk_reset_default_chartab(void);

drivers/staging/speakup/varhandlers.c

@@ -184,19 +184,19 @@ int spk_set_num_var(int input, struct st_var_header *var, int how)
 	char buf[32];
 	char *cp;
 	struct var_t *var_data = var->data;
+
 	if (var_data == NULL)
-		return E_UNDEF;
+		return -ENODATA;
 
 	if (how == E_NEW_DEFAULT) {
 		if (input < var_data->u.n.low || input > var_data->u.n.high)
-			ret = E_RANGE;
-		else
+			return -ERANGE;
 		var_data->u.n.default_val = input;
-		return ret;
+		return 0;
 	}
 	if (how == E_DEFAULT) {
 		val = var_data->u.n.default_val;
-		ret = SET_DEFAULT;
+		ret = -ERESTART;
 	} else {
 		if (how == E_SET)
 			val = input;
@@ -207,7 +207,7 @@ int spk_set_num_var(int input, struct st_var_header *var, int how)
 		else if (how == E_DEC)
 			val -= input;
 		if (val < var_data->u.n.low || val > var_data->u.n.high)
-			return E_RANGE;
+			return -ERANGE;
 	}
 	var_data->u.n.value = val;
 	if (var->var_type == VAR_TIME && p_val != NULL) {
@@ -246,25 +246,25 @@ int spk_set_num_var(int input, struct st_var_header *var, int how)
 
 int spk_set_string_var(const char *page, struct st_var_header *var, int len)
 {
-	int ret = 0;
 	struct var_t *var_data = var->data;
+
 	if (var_data == NULL)
-		return E_UNDEF;
+		return -ENODATA;
 	if (len > MAXVARLEN)
-		return -E_TOOLONG;
+		return -E2BIG;
 	if (!len) {
 		if (!var_data->u.s.default_val)
 			return 0;
-		ret = SET_DEFAULT;
 		if (!var->p_val)
 			var->p_val = var_data->u.s.default_val;
 		if (var->p_val != var_data->u.s.default_val)
 			strcpy((char *)var->p_val, var_data->u.s.default_val);
+		return -ERESTART;
 	} else if (var->p_val)
 		strcpy((char *)var->p_val, page);
 	else
-		return -E_TOOLONG;
-	return ret;
+		return -E2BIG;
+	return 0;
 }
 
 /* spk_set_mask_bits sets or clears the punc/delim/repeat bits,