sony-laptop: add touchpad enable/disable function

This setting is stored in the EC and available across reboots.

[malattia@linux.it: group function specific variables in a struct, use
kstrtoul]

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, 91 insertions, 0 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 5902bb5a9e78..210d4ae547c2 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -159,6 +159,10 @@ 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);
 
+static int sony_nc_touchpad_setup(struct platform_device *pd,
+                                  unsigned int handle);
+static void sony_nc_touchpad_cleanup(struct platform_device *pd);
+
 enum sony_nc_rfkill {
         SONY_WIFI,
         SONY_BLUETOOTH,
@@ -1290,6 +1294,14 @@ static void sony_nc_function_setup(struct acpi_device *device,
                         /* setup hotkeys */
                         sony_call_snc_handle(handle, 0x100, &result);
                         break;
+                case 0x0105:
+                case 0x0148:
+                        /* touchpad enable/disable */
+                        result = sony_nc_touchpad_setup(pf_device, handle);
+                        if (result)
+                                pr_err("couldn't set up touchpad control function (%d)\n",
+                                                result);
+                        break;
                 case 0x0115:
                 case 0x0136:
                 case 0x013f:
@@ -1359,6 +1371,10 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                         continue;
 
                 switch (handle) {
+                case 0x0105:
+                case 0x0148:
+                        sony_nc_touchpad_cleanup(pd);
+                        break;
                 case 0x0115:
                 case 0x0136:
                 case 0x013f:
@@ -2376,6 +2392,81 @@ static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd)
         }
 }
 
+/* Touchpad enable/disable */
+struct touchpad_control {
+        struct device_attribute attr;
+        int handle;
+};
+static struct touchpad_control *tp_ctl;
+
+static ssize_t sony_nc_touchpad_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;
+
+        /* sysfs: 0 disabled, 1 enabled
+         * EC: 0 enabled, 1 disabled
+         */
+        if (sony_call_snc_handle(tp_ctl->handle,
+                                (!value << 0x10) | 0x100, &result))
+                return -EIO;
+
+        return count;
+}
+
+static ssize_t sony_nc_touchpad_show(struct device *dev,
+                struct device_attribute *attr, char *buffer)
+{
+        unsigned int result;
+
+        if (sony_call_snc_handle(tp_ctl->handle, 0x000, &result))
+                return -EINVAL;
+
+        return snprintf(buffer, PAGE_SIZE, "%d\n", !(result & 0x01));
+}
+
+static int sony_nc_touchpad_setup(struct platform_device *pd,
+                unsigned int handle)
+{
+        int ret = 0;
+
+        tp_ctl = kzalloc(sizeof(struct touchpad_control), GFP_KERNEL);
+        if (!tp_ctl)
+                return -ENOMEM;
+
+        tp_ctl->handle = handle;
+
+        sysfs_attr_init(&tp_ctl->attr.attr);
+        tp_ctl->attr.attr.name = "touchpad";
+        tp_ctl->attr.attr.mode = S_IRUGO | S_IWUSR;
+        tp_ctl->attr.show = sony_nc_touchpad_show;
+        tp_ctl->attr.store = sony_nc_touchpad_store;
+
+        ret = device_create_file(&pd->dev, &tp_ctl->attr);
+        if (ret) {
+                kfree(tp_ctl);
+                tp_ctl = NULL;
+        }
+
+        return ret;
+}
+
+static void sony_nc_touchpad_cleanup(struct platform_device *pd)
+{
+        if (tp_ctl) {
+                device_remove_file(&pd->dev, &tp_ctl->attr);
+                kfree(tp_ctl);
+                tp_ctl = NULL;
+        }
+}
+
 static void sony_nc_backlight_ng_read_limits(int handle,
                 struct sony_backlight_props *props)
 {