platform/x86: lg-laptop: Support for battery charge limit on newer models

Add support for the difference between various models:

- Use dmi to detect laptop model.
- 2019 and newer models use _wmbb method to set battery charge limit.

Signed-off-by: Matan Ziv-Av <matan@svgalib.org>
Link: https://lore.kernel.org/r/bd6922a412e50c2dcfb7ce24fc8687f577181d65.1629291912.git.matan@svgalib.org
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/lg-laptop.c b/drivers/platform/x86/lg-laptop.c
index 20145b539335b79ee8070ab4cff69215eb05627f..c78efeee1c19f0de63ce3bdd1bd0b766e3029d7e 100644 (file)
--- a/drivers/platform/x86/lg-laptop.c
+++ b/drivers/platform/x86/lg-laptop.c
@@ -8,6 +8,7 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/acpi.h>
+#include <linux/dmi.h>
 #include <linux/input.h>
 #include <linux/input/sparse-keymap.h>
 #include <linux/kernel.h>
@@ -69,6 +70,8 @@ static u32 inited;
 #define INIT_INPUT_ACPI         0x04
 #define INIT_SPARSE_KEYMAP      0x80
 
+static int battery_limit_use_wmbb;
+
 static const struct key_entry wmi_keymap[] = {
        {KE_KEY, 0x70, {KEY_F15} },      /* LG control panel (F1) */
        {KE_KEY, 0x74, {KEY_F13} },      /* Touchpad toggle (F5) */
@@ -461,7 +464,10 @@ static ssize_t battery_care_limit_store(struct device *dev,
        if (value == 100 || value == 80) {
                union acpi_object *r;
 
-               r = lg_wmab(WM_BATT_LIMIT, WM_SET, value);
+               if (battery_limit_use_wmbb)
+                       r = lg_wmbb(WMBB_BATT_LIMIT, WM_SET, value);
+               else
+                       r = lg_wmab(WM_BATT_LIMIT, WM_SET, value);
                if (!r)
                        return -EIO;
 
@@ -479,16 +485,29 @@ static ssize_t battery_care_limit_show(struct device *dev,
        unsigned int status;
        union acpi_object *r;
 
-       r = lg_wmab(WM_BATT_LIMIT, WM_GET, 0);
-       if (!r)
-               return -EIO;
+       if (battery_limit_use_wmbb) {
+               r = lg_wmbb(WMBB_BATT_LIMIT, WM_GET, 0);
+               if (!r)
+                       return -EIO;
 
-       if (r->type != ACPI_TYPE_INTEGER) {
-               kfree(r);
-               return -EIO;
-       }
+               if (r->type != ACPI_TYPE_BUFFER) {
+                       kfree(r);
+                       return -EIO;
+               }
 
-       status = r->integer.value;
+               status = r->buffer.pointer[0x10];
+       } else {
+               r = lg_wmab(WM_BATT_LIMIT, WM_GET, 0);
+               if (!r)
+                       return -EIO;
+
+               if (r->type != ACPI_TYPE_INTEGER) {
+                       kfree(r);
+                       return -EIO;
+               }
+
+               status = r->integer.value;
+       }
        kfree(r);
        if (status != 80 && status != 100)
                status = 0;
@@ -602,6 +621,8 @@ static struct platform_driver pf_driver = {
 static int acpi_add(struct acpi_device *device)
 {
        int ret;
+       const char *product;
+       int year = 2017;
 
        if (pf_device)
                return 0;
@@ -619,6 +640,42 @@ static int acpi_add(struct acpi_device *device)
                pr_err("unable to register platform device\n");
                goto out_platform_registered;
        }
+       product = dmi_get_system_info(DMI_PRODUCT_NAME);
+       if (strlen(product) > 4)
+               switch (product[4]) {
+               case '5':
+               case '6':
+                       year = 2016;
+                       break;
+               case '7':
+                       year = 2017;
+                       break;
+               case '8':
+                       year = 2018;
+                       break;
+               case '9':
+                       year = 2019;
+                       break;
+               case '0':
+                       if (strlen(product) > 5)
+                               switch (product[5]) {
+                               case 'N':
+                                       year = 2020;
+                                       break;
+                               case 'P':
+                                       year = 2021;
+                                       break;
+                               default:
+                                       year = 2022;
+                               }
+                       break;
+               default:
+                       year = 2019;
+               }
+       pr_info("product: %s  year: %d\n", product, year);
+
+       if (year >= 2019)
+               battery_limit_use_wmbb = 1;
 
        ret = sysfs_create_group(&pf_device->dev.kobj, &dev_attribute_group);
        if (ret)