[PATCH 12/24] platform/x86: ideapad-laptop: rework and create new ACPI helpers

["Barnabás Pőcze" <pobrn@protonmail.com>]

Create dedicated helper functions for accessing the main ACPI methods:
GBMD, SMBC, HALS, SALS; and utilize them. Use `unsigned long` consistently
in every ACPI helper wherever possible. Change names to better express
purpose. Do not assign values to output parameters in case of failure.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index ffe41bf5585f..795978e0d13e 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -117,41 +117,47 @@ MODULE_PARM_DESC(no_bt_rfkill, "No rfkill for bluetooth.");
  */
 #define IDEAPAD_EC_TIMEOUT (200) /* in ms */
 
-static int read_method_int(acpi_handle handle, const char *method, int *val)
+static int eval_int(acpi_handle handle, const char *method, unsigned long *val)
 {
-	acpi_status status;
+	acpi_status acpi_err;
 	unsigned long long result;
 
-	status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
-	if (ACPI_FAILURE(status)) {
-		*val = -1;
+	acpi_err = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
+	if (ACPI_FAILURE(acpi_err))
 		return -EIO;
-	}
 	*val = result;
 	return 0;
+}
 
+static int eval_simple_method(acpi_handle handle, char *method, u64 arg)
+{
+	acpi_status acpi_err = acpi_execute_simple_method(handle, method, arg);
+	return ACPI_FAILURE(acpi_err) ? -EIO : 0;
 }
 
-static int method_gbmd(acpi_handle handle, unsigned long *ret)
+static int eval_gbmd(acpi_handle handle, unsigned long *val)
 {
-	int result, val;
+	return eval_int(handle, "GBMD", val);
+}
 
-	result = read_method_int(handle, "GBMD", &val);
-	*ret = val;
-	return result;
+static int eval_smbc(acpi_handle handle, unsigned long arg)
+{
+	return eval_simple_method(handle, "SMBC", arg);
 }
 
-static int method_int1(acpi_handle handle, char *method, int cmd)
+static int eval_hals(acpi_handle handle, unsigned long *val)
 {
-	acpi_status status;
+	return eval_int(handle, "HALS", val);
+}
 
-	status = acpi_execute_simple_method(handle, method, cmd);
-	return ACPI_FAILURE(status) ? -EIO : 0;
+static int eval_sals(acpi_handle handle, unsigned long arg)
+{
+	return eval_simple_method(handle, "SALS", arg);
 }
 
-static int method_vpcr(acpi_handle handle, int cmd, int *ret)
+static int eval_vpcr(acpi_handle handle, unsigned long cmd, unsigned long *val)
 {
-	acpi_status status;
+	acpi_status acpi_err;
 	unsigned long long result;
 	struct acpi_object_list params;
 	union acpi_object in_obj;
@@ -161,22 +167,20 @@ static int method_vpcr(acpi_handle handle, int cmd, int *ret)
 	in_obj.type = ACPI_TYPE_INTEGER;
 	in_obj.integer.value = cmd;
 
-	status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
+	acpi_err = acpi_evaluate_integer(handle, "VPCR", &params, &result);
 
-	if (ACPI_FAILURE(status)) {
-		*ret = -1;
+	if (ACPI_FAILURE(acpi_err))
 		return -EIO;
-	}
-	*ret = result;
+	*val = result;
 	return 0;
 
 }
 
-static int method_vpcw(acpi_handle handle, int cmd, int data)
+static int eval_vpcw(acpi_handle handle, unsigned long cmd, unsigned long data)
 {
 	struct acpi_object_list params;
 	union acpi_object in_obj[2];
-	acpi_status status;
+	acpi_status acpi_err;
 
 	params.count = 2;
 	params.pointer = in_obj;
@@ -185,55 +189,50 @@ static int method_vpcw(acpi_handle handle, int cmd, int data)
 	in_obj[1].type = ACPI_TYPE_INTEGER;
 	in_obj[1].integer.value = data;
 
-	status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
-	if (status != AE_OK)
+	acpi_err = acpi_evaluate_object(handle, "VPCW", &params, NULL);
+	if (ACPI_FAILURE(acpi_err))
 		return -EIO;
 	return 0;
 }
 
-static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
+static int read_ec_data(acpi_handle handle, unsigned long cmd, unsigned long *data)
 {
-	int val, err;
-	unsigned long int end_jiffies;
+	int err;
+	unsigned long int end_jiffies, val;
 
-	err = method_vpcw(handle, 1, cmd);
+	err = eval_vpcw(handle, 1, cmd);
 	if (err)
 		return err;
 
 	for (end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1;
 	     time_before(jiffies, end_jiffies);) {
 		schedule();
-		err = method_vpcr(handle, 1, &val);
+		err = eval_vpcr(handle, 1, &val);
 		if (err)
 			return err;
-		if (val == 0) {
-			err = method_vpcr(handle, 0, &val);
-			if (err)
-				return err;
-			*data = val;
-			return 0;
-		}
+		if (val == 0)
+			return eval_vpcr(handle, 0, data);
 	}
 	acpi_handle_err(handle, "timeout in %s\n", __func__);
 	return -ETIMEDOUT;
 }
 
-static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
+static int write_ec_cmd(acpi_handle handle, unsigned long cmd, unsigned long data)
 {
-	int val, err;
-	unsigned long int end_jiffies;
+	int err;
+	unsigned long end_jiffies, val;
 
-	err = method_vpcw(handle, 0, data);
+	err = eval_vpcw(handle, 0, data);
 	if (err)
 		return err;
-	err = method_vpcw(handle, 1, cmd);
+	err = eval_vpcw(handle, 1, cmd);
 	if (err)
 		return err;
 
 	for (end_jiffies = jiffies + msecs_to_jiffies(IDEAPAD_EC_TIMEOUT) + 1;
 	     time_before(jiffies, end_jiffies);) {
 		schedule();
-		err = method_vpcr(handle, 1, &val);
+		err = eval_vpcr(handle, 1, &val);
 		if (err)
 			return err;
 		if (val == 0)
@@ -284,7 +283,7 @@ static int debugfs_status_show(struct seq_file *s, void *data)
 			   value ? "On" : "Off", value);
 	seq_puts(s, "=====================\n");
 
-	if (!method_gbmd(priv->adev->handle, &value)) {
+	if (!eval_gbmd(priv->adev->handle, &value)) {
 		seq_printf(s, "Conservation mode:\t%s(%lu)\n",
 			   test_bit(GBMD_CONSERVATION_STATE_BIT, &value) ? "On" : "Off",
 			   value);
@@ -466,7 +465,7 @@ static ssize_t conservation_mode_show(struct device *dev,
 	unsigned long result;
 	int err;
 
-	err = method_gbmd(priv->adev->handle, &result);
+	err = eval_gbmd(priv->adev->handle, &result);
 	if (err)
 		return err;
 	return sysfs_emit(buf, "%u\n", test_bit(GBMD_CONSERVATION_STATE_BIT, &result));
@@ -484,9 +483,8 @@ static ssize_t conservation_mode_store(struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = method_int1(priv->adev->handle, "SBMC", state ?
-					      SMBC_CONSERVATION_ON :
-					      SMBC_CONSERVATION_OFF);
+	ret = eval_smbc(priv->adev->handle,
+			state ? SMBC_CONSERVATION_ON : SMBC_CONSERVATION_OFF);
 	if (ret)
 		return ret;
 	return count;
@@ -499,15 +497,13 @@ static ssize_t fn_lock_show(struct device *dev,
 			    char *buf)
 {
 	struct ideapad_private *priv = dev_get_drvdata(dev);
-	unsigned long result;
-	int hals;
-	int fail = read_method_int(priv->adev->handle, "HALS", &hals);
+	unsigned long hals;
+	int fail = eval_hals(priv->adev->handle, &hals);
 
 	if (fail)
 		return fail;
 
-	result = hals;
-	return sysfs_emit(buf, "%u\n", test_bit(HALS_FNLOCK_STATE_BIT, &result));
+	return sysfs_emit(buf, "%u\n", test_bit(HALS_FNLOCK_STATE_BIT, &hals));
 }
 
 static ssize_t fn_lock_store(struct device *dev,
@@ -522,9 +518,8 @@ static ssize_t fn_lock_store(struct device *dev,
 	if (ret)
 		return ret;
 
-	ret = method_int1(priv->adev->handle, "SALS", state ?
-			  SALS_FNLOCK_ON :
-			  SALS_FNLOCK_OFF);
+	ret = eval_sals(priv->adev->handle,
+			state ? SALS_FNLOCK_ON : SALS_FNLOCK_OFF);
 	if (ret)
 		return ret;
 	return count;
@@ -1009,7 +1004,7 @@ static const struct dmi_system_id hw_rfkill_list[] = {
 static int ideapad_acpi_add(struct platform_device *pdev)
 {
 	int ret, i;
-	int cfg;
+	unsigned long cfg;
 	struct ideapad_private *priv;
 	struct acpi_device *adev;
 	acpi_status acpi_err;
@@ -1018,7 +1013,7 @@ static int ideapad_acpi_add(struct platform_device *pdev)
 	if (ret)
 		return -ENODEV;
 
-	if (read_method_int(adev->handle, "_CFG", &cfg))
+	if (eval_int(adev->handle, "_CFG", &cfg))
 		return -ENODEV;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-- 
2.29.2