ACPI: thinkpad-acpi: add sysfs support to hotkey subdriver

Add the hotkey sysfs support.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 129 insertions, 0 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index a56526500c18..83a8d984e709 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -706,6 +706,108 @@ static struct ibm_struct thinkpad_acpi_driver_data = {
 static int hotkey_orig_status;
 static int hotkey_orig_mask;
 
+static struct attribute_set *hotkey_dev_attributes = NULL;
+
+/* sysfs hotkey enable ------------------------------------------------- */
+static ssize_t hotkey_enable_show(struct device *dev,
+                           struct device_attribute *attr,
+                           char *buf)
+{
+        int res, status, mask;
+
+        res = hotkey_get(&status, &mask);
+        if (res)
+                return res;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", status);
+}
+
+static ssize_t hotkey_enable_store(struct device *dev,
+                            struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        unsigned long t;
+        int res, status, mask;
+
+        if (parse_strtoul(buf, 1, &t))
+                return -EINVAL;
+
+        res = hotkey_get(&status, &mask);
+        if (!res)
+                res = hotkey_set(t, mask);
+
+        return (res) ? res : count;
+}
+
+static struct device_attribute dev_attr_hotkey_enable =
+        __ATTR(enable, S_IWUSR | S_IRUGO,
+                hotkey_enable_show, hotkey_enable_store);
+
+/* sysfs hotkey mask --------------------------------------------------- */
+static ssize_t hotkey_mask_show(struct device *dev,
+                           struct device_attribute *attr,
+                           char *buf)
+{
+        int res, status, mask;
+
+        res = hotkey_get(&status, &mask);
+        if (res)
+                return res;
+
+        return snprintf(buf, PAGE_SIZE, "0x%04x\n", mask);
+}
+
+static ssize_t hotkey_mask_store(struct device *dev,
+                            struct device_attribute *attr,
+                            const char *buf, size_t count)
+{
+        unsigned long t;
+        int res, status, mask;
+
+        if (parse_strtoul(buf, 0xffff, &t))
+                return -EINVAL;
+
+        res = hotkey_get(&status, &mask);
+        if (!res)
+                hotkey_set(status, t);
+
+        return (res) ? res : count;
+}
+
+static struct device_attribute dev_attr_hotkey_mask =
+        __ATTR(mask, S_IWUSR | S_IRUGO,
+                hotkey_mask_show, hotkey_mask_store);
+
+/* sysfs hotkey bios_enabled ------------------------------------------- */
+static ssize_t hotkey_bios_enabled_show(struct device *dev,
+                           struct device_attribute *attr,
+                           char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "%d\n", hotkey_orig_status);
+}
+
+static struct device_attribute dev_attr_hotkey_bios_enabled =
+        __ATTR(bios_enabled, S_IRUGO, hotkey_bios_enabled_show, NULL);
+
+/* sysfs hotkey bios_mask ---------------------------------------------- */
+static ssize_t hotkey_bios_mask_show(struct device *dev,
+                           struct device_attribute *attr,
+                           char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "0x%04x\n", hotkey_orig_mask);
+}
+
+static struct device_attribute dev_attr_hotkey_bios_mask =
+        __ATTR(bios_mask, S_IRUGO, hotkey_bios_mask_show, NULL);
+
+/* --------------------------------------------------------------------- */
+
+static struct attribute *hotkey_mask_attributes[] = {
+        &dev_attr_hotkey_mask.attr,
+        &dev_attr_hotkey_bios_enabled.attr,
+        &dev_attr_hotkey_bios_mask.attr,
+};
+
 static int __init hotkey_init(struct ibm_init_struct *iibm)
 {
         int res;
@@ -722,6 +824,15 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                 str_supported(tp_features.hotkey));
 
         if (tp_features.hotkey) {
+                hotkey_dev_attributes = create_attr_set(4,
+                                                TPACPI_HOTKEY_SYSFS_GROUP);
+                if (!hotkey_dev_attributes)
+                        return -ENOMEM;
+                res = add_to_attr_set(hotkey_dev_attributes,
+                                &dev_attr_hotkey_enable.attr);
+                if (res)
+                        return res;
+
                 /* mask not supported on 570, 600e/x, 770e, 770x, A21e, A2xm/p,
                    A30, R30, R31, T20-22, X20-21, X22-24 */
                 tp_features.hotkey_mask =
@@ -731,6 +842,16 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                         str_supported(tp_features.hotkey_mask));
 
                 res = hotkey_get(&hotkey_orig_status, &hotkey_orig_mask);
+                if (!res && tp_features.hotkey_mask) {
+                        res = add_many_to_attr_set(hotkey_dev_attributes,
+                                hotkey_mask_attributes,
+                                ARRAY_SIZE(hotkey_mask_attributes));
+                }
+                if (!res)
+                        res = register_attr_set_with_sysfs(
+                                        hotkey_dev_attributes,
+                                        &tpacpi_pdev->dev.kobj);
+
                 if (res)
                         return res;
         }
@@ -748,6 +869,11 @@ static void hotkey_exit(void)
                 if (res)
                         printk(IBM_ERR "failed to restore hotkey to BIOS defaults\n");
         }
+
+        if (hotkey_dev_attributes) {
+                delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
+                hotkey_dev_attributes = NULL;
+        }
 }
 
 static void hotkey_notify(struct ibm_struct *ibm, u32 event)
@@ -798,6 +924,7 @@ static int hotkey_set(int status, int mask)
         return 0;
 }
 
+/* procfs -------------------------------------------------------------- */
 static int hotkey_read(char *p)
 {
         int res, status, mask;
diff --git a/drivers/misc/thinkpad_acpi.h b/drivers/misc/thinkpad_acpi.h
index a9e709368256..7615adb381c8 100644
--- a/drivers/misc/thinkpad_acpi.h
+++ b/drivers/misc/thinkpad_acpi.h
@@ -414,6 +414,8 @@ static int fan_write_cmd_watchdog(const char *cmd, int *rc);
  * Hotkey subdriver
  */
 
+#define TPACPI_HOTKEY_SYSFS_GROUP "hotkey"
+
 static int hotkey_orig_status;
 static int hotkey_orig_mask;