Input: st1232 - expose firmware version via sysfs

Allow user space programs to read the firmware version and revision of
the touch controller from the sysfs.

Suggested-by: Khalid Talash <ktalash@topcon.com>
Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Link: https://patch.msgid.link/20260123-input-st1232-firmware-version-v1-2-32df7eefdafe@pengutronix.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
index 3dfee15fb3ad294f7bb2bf69a289b77a4fab6161..9b266927b7fe3df0a74b00facd02a0147dfdb80c 100644 (file)
--- a/drivers/input/touchscreen/st1232.c
+++ b/drivers/input/touchscreen/st1232.c
@@ -69,6 +69,34 @@ struct st1232_ts_data {
        u32 fw_revision;
 };
 
+static ssize_t fw_version_show(struct device *dev,
+                              struct device_attribute *attr, char *buf)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct st1232_ts_data *st1232_ts = i2c_get_clientdata(client);
+
+       return sysfs_emit(buf, "%u\n", st1232_ts->fw_version);
+}
+
+static ssize_t fw_revision_show(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+       struct st1232_ts_data *st1232_ts = i2c_get_clientdata(client);
+
+       return sysfs_emit(buf, "%08x\n", st1232_ts->fw_revision);
+}
+
+static DEVICE_ATTR_RO(fw_version);
+static DEVICE_ATTR_RO(fw_revision);
+
+static struct attribute *st1232_attrs[] = {
+       &dev_attr_fw_version.attr,
+       &dev_attr_fw_revision.attr,
+       NULL,
+};
+ATTRIBUTE_GROUPS(st1232);
+
 static int st1232_ts_read_data(struct st1232_ts_data *ts, u8 reg,
                               unsigned int n)
 {
@@ -444,6 +472,7 @@ static struct i2c_driver st1232_ts_driver = {
        .driver = {
                .name   = ST1232_TS_NAME,
                .of_match_table = st1232_ts_dt_ids,
+               .dev_groups     = st1232_groups,
                .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
                .pm     = pm_sleep_ptr(&st1232_ts_pm_ops),
        },