sony-laptop: allow reading the status of gfx switch

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 0bee6c2f8864f2a94c2e28232563d6778f17d354..46c71f49a6b49be0670d42524e2237bd1dcec67b 100644 (file)
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -158,6 +158,11 @@ static void sony_nc_thermal_cleanup(struct platform_device *pd);
 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_gfx_switch_setup(struct platform_device *pd,
+               unsigned int handle);
+static void sony_nc_gfx_switch_cleanup(struct platform_device *pd);
+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);
 
@@ -1241,17 +1246,13 @@ static void sony_nc_notify(struct acpi_device *device, u32 event)
                        /* Hybrid GFX switching */
                        sony_call_snc_handle(handle, 0x0000, &result);
                        dprintk("GFX switch event received (reason: %s)\n",
-                                       (result & 0x01) ?
-                                       "switch change" : "unknown");
-
-                       /* verify the switch state
-                        * 1: discrete GFX
-                        * 0: integrated GFX
-                        */
-                       sony_call_snc_handle(handle, 0x0100, &result);
+                                       (result == 0x1) ? "switch change" :
+                                       (result == 0x2) ? "output switch" :
+                                       (result == 0x3) ? "output switch" :
+                                       "");
 
                        ev_type = GFX_SWITCH;
-                       real_ev = result & 0xff;
+                       real_ev = __sony_nc_gfx_switch_status_get();
                        break;
 
                default:
@@ -1350,6 +1351,13 @@ static void sony_nc_function_setup(struct acpi_device *device,
                                pr_err("couldn't set up thermal profile function (%d)\n",
                                                result);
                        break;
+               case 0x0128:
+               case 0x0146:
+                       result = sony_nc_gfx_switch_setup(pf_device, handle);
+                       if (result)
+                               pr_err("couldn't set up GFX Switch status (%d)\n",
+                                               result);
+                       break;
                case 0x0131:
                        result = sony_nc_highspeed_charging_setup(pf_device);
                        if (result)
@@ -1414,6 +1422,10 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                case 0x0122:
                        sony_nc_thermal_cleanup(pd);
                        break;
+               case 0x0128:
+               case 0x0146:
+                       sony_nc_gfx_switch_cleanup(pd);
+                       break;
                case 0x0131:
                        sony_nc_highspeed_charging_cleanup(pd);
                        break;
@@ -2355,6 +2367,97 @@ static void sony_nc_lid_resume_cleanup(struct platform_device *pd)
        }
 }
 
+/* GFX Switch position */
+enum gfx_switch {
+       SPEED,
+       STAMINA,
+       AUTO
+};
+struct snc_gfx_switch_control {
+       struct device_attribute attr;
+       unsigned int handle;
+};
+static struct snc_gfx_switch_control *gfxs_ctl;
+
+/* returns 0 for speed, 1 for stamina */
+static int __sony_nc_gfx_switch_status_get(void)
+{
+       unsigned int result;
+
+       if (sony_call_snc_handle(gfxs_ctl->handle, 0x0100, &result))
+               return -EIO;
+
+       switch (gfxs_ctl->handle) {
+       case 0x0146:
+               /* 1: discrete GFX (speed)
+                * 0: integrated GFX (stamina)
+                */
+               return result & 0x1 ? SPEED : STAMINA;
+               break;
+       case 0x0128:
+               /* it's a more elaborated bitmask, for now:
+                * 2: integrated GFX (stamina)
+                * 0: discrete GFX (speed)
+                */
+               dprintk("GFX Status: 0x%x\n", result);
+               return result & 0x80 ? AUTO :
+                       result & 0x02 ? STAMINA : SPEED;
+               break;
+       }
+       return -EINVAL;
+}
+
+static ssize_t sony_nc_gfx_switch_status_show(struct device *dev,
+                                      struct device_attribute *attr,
+                                      char *buffer)
+{
+       int pos = __sony_nc_gfx_switch_status_get();
+
+       if (pos < 0)
+               return pos;
+
+       return snprintf(buffer, PAGE_SIZE, "%s\n", pos ? "speed" : "stamina");
+}
+
+static int sony_nc_gfx_switch_setup(struct platform_device *pd,
+               unsigned int handle)
+{
+       unsigned int result;
+
+       gfxs_ctl = kzalloc(sizeof(struct snc_gfx_switch_control), GFP_KERNEL);
+       if (!gfxs_ctl)
+               return -ENOMEM;
+
+       gfxs_ctl->handle = handle;
+
+       sysfs_attr_init(&gfxs_ctl->attr.attr);
+       gfxs_ctl->attr.attr.name = "gfx_switch_status";
+       gfxs_ctl->attr.attr.mode = S_IRUGO;
+       gfxs_ctl->attr.show = sony_nc_gfx_switch_status_show;
+
+       result = device_create_file(&pd->dev, &gfxs_ctl->attr);
+       if (result)
+               goto gfxerror;
+
+       return 0;
+
+gfxerror:
+       kfree(gfxs_ctl);
+       gfxs_ctl = NULL;
+
+       return result;
+}
+
+static void sony_nc_gfx_switch_cleanup(struct platform_device *pd)
+{
+       if (gfxs_ctl) {
+               device_remove_file(&pd->dev, &gfxs_ctl->attr);
+
+               kfree(gfxs_ctl);
+               gfxs_ctl = NULL;
+       }
+}
+
 /* High speed charging function */
 static struct device_attribute *hsc_handle;