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>

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index bc7f40b..fcbedc9 100644 (file)
--- 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)
 {