Merge back power-related ACPI material for v4.12.

3 files changed, 106 insertions, 2 deletions

diff --git a/drivers/acpi/ac.c b/drivers/acpi/ac.c
index f71b756b05c4..8f52483219ba 100644
--- a/drivers/acpi/ac.c
+++ b/drivers/acpi/ac.c
@@ -57,12 +57,23 @@ static int acpi_ac_add(struct acpi_device *device);
 static int acpi_ac_remove(struct acpi_device *device);
 static void acpi_ac_notify(struct acpi_device *device, u32 event);
 
+struct acpi_ac_bl {
+	const char *hid;
+	int hrv;
+};
+
 static const struct acpi_device_id ac_device_ids[] = {
 	{"ACPI0003", 0},
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 
+/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
+static const struct acpi_ac_bl acpi_ac_blacklist[] = {
+	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
+	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
+};
+
 #ifdef CONFIG_PM_SLEEP
 static int acpi_ac_resume(struct device *dev);
 #endif
@@ -424,11 +435,20 @@ static int acpi_ac_remove(struct acpi_device *device)
 
 static int __init acpi_ac_init(void)
 {
+	unsigned int i;
 	int result;
 
 	if (acpi_disabled)
 		return -ENODEV;
 
+	for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
+		if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
+				     acpi_ac_blacklist[i].hrv)) {
+			pr_info(PREFIX "AC: found native %s PMIC, not loading\n",
+				acpi_ac_blacklist[i].hid);
+			return -ENODEV;
+		}
+
 #ifdef CONFIG_ACPI_PROCFS_POWER
 	acpi_ac_dir = acpi_lock_ac_dir();
 	if (!acpi_ac_dir)
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 4ef1e4624b2b..d42eeef9d928 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -67,6 +67,7 @@ MODULE_DESCRIPTION("ACPI Battery Driver");
 MODULE_LICENSE("GPL");
 
 static async_cookie_t async_cookie;
+static bool battery_driver_registered;
 static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
 static unsigned int cache_time = 1000;
@@ -93,6 +94,11 @@ static const struct acpi_device_id battery_device_ids[] = {
 
 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
 
+/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
+static const char * const acpi_battery_blacklist[] = {
+	"INT33F4", /* X-Powers AXP288 PMIC */
+};
+
 enum {
 	ACPI_BATTERY_ALARM_PRESENT,
 	ACPI_BATTERY_XINFO_PRESENT,
@@ -1315,8 +1321,17 @@ static struct acpi_driver acpi_battery_driver = {
 
 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 {
+	unsigned int i;
 	int result;
 
+	for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
+		if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
+			pr_info(PREFIX ACPI_BATTERY_DEVICE_NAME
+				": found native %s PMIC, not loading\n",
+				acpi_battery_blacklist[i]);
+			return;
+		}
+
 	dmi_check_system(bat_dmi_table);
 
 #ifdef CONFIG_ACPI_PROCFS_POWER
@@ -1329,6 +1344,7 @@ static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 	if (result < 0)
 		acpi_unlock_battery_dir(acpi_battery_dir);
 #endif
+	battery_driver_registered = (result == 0);
 }
 
 static int __init acpi_battery_init(void)
@@ -1343,9 +1359,11 @@ static int __init acpi_battery_init(void)
 static void __exit acpi_battery_exit(void)
 {
 	async_synchronize_cookie(async_cookie + 1);
-	acpi_bus_unregister_driver(&acpi_battery_driver);
+	if (battery_driver_registered)
+		acpi_bus_unregister_driver(&acpi_battery_driver);
 #ifdef CONFIG_ACPI_PROCFS_POWER
-	acpi_unlock_battery_dir(acpi_battery_dir);
+	if (acpi_battery_dir)
+		acpi_unlock_battery_dir(acpi_battery_dir);
 #endif
 }
 
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 22c09952e177..27d0dcfcf47d 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -736,6 +736,72 @@ bool acpi_dev_found(const char *hid)
 }
 EXPORT_SYMBOL(acpi_dev_found);
 
+struct acpi_dev_present_info {
+	struct acpi_device_id hid[2];
+	const char *uid;
+	s64 hrv;
+};
+
+static int acpi_dev_present_cb(struct device *dev, void *data)
+{
+	struct acpi_device *adev = to_acpi_device(dev);
+	struct acpi_dev_present_info *match = data;
+	unsigned long long hrv;
+	acpi_status status;
+
+	if (acpi_match_device_ids(adev, match->hid))
+		return 0;
+
+	if (match->uid && (!adev->pnp.unique_id ||
+	    strcmp(adev->pnp.unique_id, match->uid)))
+		return 0;
+
+	if (match->hrv == -1)
+		return 1;
+
+	status = acpi_evaluate_integer(adev->handle, "_HRV", NULL, &hrv);
+	if (ACPI_FAILURE(status))
+		return 0;
+
+	return hrv == match->hrv;
+}
+
+/**
+ * acpi_dev_present - Detect that a given ACPI device is present
+ * @hid: Hardware ID of the device.
+ * @uid: Unique ID of the device, pass NULL to not check _UID
+ * @hrv: Hardware Revision of the device, pass -1 to not check _HRV
+ *
+ * Return %true if a matching device was present at the moment of invocation.
+ * Note that if the device is pluggable, it may since have disappeared.
+ *
+ * Note that unlike acpi_dev_found() this function checks the status
+ * of the device. So for devices which are present in the dsdt, but
+ * which are disabled (their _STA callback returns 0) this function
+ * will return false.
+ *
+ * For this function to work, acpi_bus_scan() must have been executed
+ * which happens in the subsys_initcall() subsection. Hence, do not
+ * call from a subsys_initcall() or earlier (use acpi_get_devices()
+ * instead). Calling from module_init() is fine (which is synonymous
+ * with device_initcall()).
+ */
+bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
+{
+	struct acpi_dev_present_info match = {};
+	struct device *dev;
+
+	strlcpy(match.hid[0].id, hid, sizeof(match.hid[0].id));
+	match.uid = uid;
+	match.hrv = hrv;
+
+	dev = bus_find_device(&acpi_bus_type, NULL, &match,
+			      acpi_dev_present_cb);
+
+	return !!dev;
+}
+EXPORT_SYMBOL(acpi_dev_present);
+
 /*
  * acpi_backlight= handling, this is done here rather then in video_detect.c
  * because __setup cannot be used in modules.