Input: atmel_mxt_ts - add sysfs entries to read fw and hw version

Make firmware and hardware version strings available to userspace.
This is useful, for example, to allow a userspace program to implement
a firwmare update policy.

Change-Id: I1eddb4bbf5f3f9ae6947a8528598973ddead18cf
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 7a839d10633..f2c1fbe2556 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -882,6 +882,26 @@ static void mxt_calc_resolution(struct mxt_data *data)
         }
 }
 
+/* Firmware Version is returned as Major.Minor.Build */
+static ssize_t mxt_fw_version_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct mxt_data *data = dev_get_drvdata(dev);
+        struct mxt_info *info = &data->info;
+        return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
+                         info->version >> 4, info->version & 0xf, info->build);
+}
+
+/* Hardware Version is returned as FamilyID.VariantID */
+static ssize_t mxt_hw_version_show(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct mxt_data *data = dev_get_drvdata(dev);
+        struct mxt_info *info = &data->info;
+        return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
+                         info->family_id, info->variant_id);
+}
+
 static ssize_t mxt_show_instance(char *buf, int count,
                                  struct mxt_object *object, int instance,
                                  const u8 *val)
@@ -1047,10 +1067,14 @@ static ssize_t mxt_update_fw_store(struct device *dev,
         return count;
 }
 
+static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
+static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
 static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
 
 static struct attribute *mxt_attrs[] = {
+        &dev_attr_fw_version.attr,
+        &dev_attr_hw_version.attr,
         &dev_attr_object.attr,
         &dev_attr_update_fw.attr,
         NULL