sony-laptop: add usb charge function

Allows to specify if the USB socket should charge attached devices while
the laptop is suspended to ram.

Signed-off-by: Javier Achirica <jachirica@gmail.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index d1f712e..9620285 100644 (file)
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -164,6 +164,9 @@ static int __sony_nc_gfx_switch_status_get(void);
 static int sony_nc_highspeed_charging_setup(struct platform_device *pd);
 static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd);
 
+static int sony_nc_usb_charge_setup(struct platform_device *pd);
+static void sony_nc_usb_charge_cleanup(struct platform_device *pd);
+
 static int sony_nc_panelid_setup(struct platform_device *pd);
 static void sony_nc_panelid_cleanup(struct platform_device *pd);
 
@@ -1388,6 +1391,12 @@ static void sony_nc_function_setup(struct acpi_device *device,
                                pr_err("couldn't set up keyboard backlight function (%d)\n",
                                                result);
                        break;
+               case 0x0155:
+                       result = sony_nc_usb_charge_setup(pf_device);
+                       if (result)
+                               pr_err("couldn't set up USB charge support (%d)\n",
+                                               result);
+                       break;
                case 0x011D:
                        result = sony_nc_panelid_setup(pf_device);
                        if (result)
@@ -1458,6 +1467,9 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                case 0x0163:
                        sony_nc_kbd_backlight_cleanup(pd, handle);
                        break;
+               case 0x0155:
+                       sony_nc_usb_charge_cleanup(pd);
+                       break;
                case 0x011D:
                        sony_nc_panelid_cleanup(pd);
                        break;
@@ -2552,6 +2564,80 @@ static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd)
        }
 }
 
+/* USB charge function */
+static struct device_attribute *uc_handle;
+
+static ssize_t sony_nc_usb_charge_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(0x0155, value << 0x10 | 0x0100, &result))
+               return -EIO;
+
+       return count;
+}
+
+static ssize_t sony_nc_usb_charge_show(struct device *dev,
+               struct device_attribute *attr, char *buffer)
+{
+       unsigned int result;
+
+       if (sony_call_snc_handle(0x0155, 0x0000, &result))
+               return -EIO;
+
+       return snprintf(buffer, PAGE_SIZE, "%d\n", result & 0x01);
+}
+
+static int sony_nc_usb_charge_setup(struct platform_device *pd)
+{
+       unsigned int result;
+
+       if (sony_call_snc_handle(0x0155, 0x0000, &result) || !(result & 0x01)) {
+               /* some models advertise the handle but have no implementation
+                * for it
+                */
+               pr_info("No USB Charge capability found\n");
+               return 0;
+       }
+
+       uc_handle = kzalloc(sizeof(struct device_attribute), GFP_KERNEL);
+       if (!uc_handle)
+               return -ENOMEM;
+
+       sysfs_attr_init(&uc_handle->attr);
+       uc_handle->attr.name = "usb_charge";
+       uc_handle->attr.mode = S_IRUGO | S_IWUSR;
+       uc_handle->show = sony_nc_usb_charge_show;
+       uc_handle->store = sony_nc_usb_charge_store;
+
+       result = device_create_file(&pd->dev, uc_handle);
+       if (result) {
+               kfree(uc_handle);
+               uc_handle = NULL;
+               return result;
+       }
+
+       return 0;
+}
+
+static void sony_nc_usb_charge_cleanup(struct platform_device *pd)
+{
+       if (uc_handle) {
+               device_remove_file(&pd->dev, uc_handle);
+               kfree(uc_handle);
+               uc_handle = NULL;
+       }
+}
+
 /* Panel ID function */
 static struct device_attribute *panel_handle;