sony-laptop: add high speed battery charging function

Signed-off-by: Marco Chiappero <marco@absence.it>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index bc7f40bcd9c..fcbedc97202 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -155,6 +155,9 @@ static void sony_nc_thermal_resume(void);
 static int sony_nc_lid_resume_setup(struct platform_device *pd);
 static void sony_nc_lid_resume_cleanup(struct platform_device *pd);
 
+static int sony_nc_highspeed_charging_setup(struct platform_device *pd);
+static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd);
+
 enum sony_nc_rfkill {
         SONY_WIFI,
         SONY_BLUETOOTH,
@@ -1301,6 +1304,12 @@ static void sony_nc_function_setup(struct acpi_device *device,
                                 pr_err("couldn't set up thermal profile function (%d)\n",
                                                 result);
                         break;
+                case 0x0131:
+                        result = sony_nc_highspeed_charging_setup(pf_device);
+                        if (result)
+                                pr_err("couldn't set up high speed charging function (%d)\n",
+                                       result);
+                        break;
                 case 0x0124:
                 case 0x0135:
                         sony_nc_rfkill_setup(device);
@@ -1348,6 +1357,9 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                 case 0x0122:
                         sony_nc_thermal_cleanup(pd);
                         break;
+                case 0x0131:
+                        sony_nc_highspeed_charging_cleanup(pd);
+                        break;
                 case 0x0124:
                 case 0x0135:
                         sony_nc_rfkill_cleanup();
@@ -2246,6 +2258,80 @@ static void sony_nc_lid_resume_cleanup(struct platform_device *pd)
         }
 }
 
+/* High speed charging function */
+static struct device_attribute *hsc_handle;
+
+static ssize_t sony_nc_highspeed_charging_store(struct device *dev,
+                struct device_attribute *attr,
+                const char *buffer, size_t count)
+{
+        unsigned int result;
+        unsigned long value;
+
+        if (count > 31)
+                return -EINVAL;
+
+        if (kstrtoul(buffer, 10, &value) || value > 1)
+                return -EINVAL;
+
+        if (sony_call_snc_handle(0x0131, value << 0x10 | 0x0200, &result))
+                return -EIO;
+
+        return count;
+}
+
+static ssize_t sony_nc_highspeed_charging_show(struct device *dev,
+                struct device_attribute *attr, char *buffer)
+{
+        unsigned int result;
+
+        if (sony_call_snc_handle(0x0131, 0x0100, &result))
+                return -EIO;
+
+        return snprintf(buffer, PAGE_SIZE, "%d\n", result & 0x01);
+}
+
+static int sony_nc_highspeed_charging_setup(struct platform_device *pd)
+{
+        unsigned int result;
+
+        if (sony_call_snc_handle(0x0131, 0x0000, &result) || !(result & 0x01)) {
+                /* some models advertise the handle but have no implementation
+                 * for it
+                 */
+                pr_info("No High Speed Charging capability found\n");
+                return 0;
+        }
+
+        hsc_handle = kzalloc(sizeof(struct device_attribute), GFP_KERNEL);
+        if (!hsc_handle)
+                return -ENOMEM;
+
+        sysfs_attr_init(&hsc_handle->attr);
+        hsc_handle->attr.name = "battery_highspeed_charging";
+        hsc_handle->attr.mode = S_IRUGO | S_IWUSR;
+        hsc_handle->show = sony_nc_highspeed_charging_show;
+        hsc_handle->store = sony_nc_highspeed_charging_store;
+
+        result = device_create_file(&pd->dev, hsc_handle);
+        if (result) {
+                kfree(hsc_handle);
+                hsc_handle = NULL;
+                return result;
+        }
+
+        return 0;
+}
+
+static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd)
+{
+        if (hsc_handle) {
+                device_remove_file(&pd->dev, hsc_handle);
+                kfree(hsc_handle);
+                hsc_handle = NULL;
+        }
+}
+
 static void sony_nc_backlight_ng_read_limits(int handle,
                 struct sony_backlight_props *props)
 {