[PATCH v2 3/4] Input: exc3000: expose type, model and firmware revision as sysfs attributes

[Lucas Stach <l.stach@pengutronix.de>]

This can be used by userspace to determine if a firmware update should be
started.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
v2:
- use devm_device_add_group
---
 drivers/input/touchscreen/exc3000.c | 47 +++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
index 8d170bac182d..28621389917c 100644
--- a/drivers/input/touchscreen/exc3000.c
+++ b/drivers/input/touchscreen/exc3000.c
@@ -209,6 +209,48 @@ static int exc3000_vendor_data_request(struct exc3000_data *data, u8 *request,
 
 	return ret;
 }
+
+static ssize_t exc3000_sysfs_type_show(struct device *dev,
+				       struct device_attribute *dattr,
+				       char *buf)
+{
+	struct exc3000_data *data = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", data->type);
+}
+static DEVICE_ATTR(type, 0444, exc3000_sysfs_type_show, NULL);
+
+static ssize_t exc3000_sysfs_model_show(struct device *dev,
+					struct device_attribute *dattr,
+					char *buf)
+{
+	struct exc3000_data *data = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", data->model);
+}
+static DEVICE_ATTR(model, 0444, exc3000_sysfs_model_show, NULL);
+
+static ssize_t exc3000_sysfs_fw_rev_show(struct device *dev,
+					 struct device_attribute *dattr,
+					 char *buf)
+{
+	struct exc3000_data *data = dev_get_drvdata(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", data->fw_rev);
+}
+static DEVICE_ATTR(fw_rev, 0444, exc3000_sysfs_fw_rev_show, NULL);
+
+static struct attribute *exc3000_fw_info_attrs[] = {
+	&dev_attr_type.attr,
+	&dev_attr_model.attr,
+	&dev_attr_fw_rev.attr,
+	NULL
+};
+
+static const struct attribute_group exc3000_fw_info_attr_group = {
+	.attrs = exc3000_fw_info_attrs,
+};
+
 static int exc3000_populate_device_info(struct exc3000_data *data)
 {
 	struct device *dev = &data->client->dev;
@@ -263,6 +305,10 @@ static int exc3000_populate_device_info(struct exc3000_data *data)
 	if (!data->fw_rev)
 		return -ENOMEM;
 
+	ret = devm_device_add_group(dev, &exc3000_fw_info_attr_group);
+	if (ret)
+		return ret;
+
 	dev_info(&data->client->dev,
 		 "found type %s, model %s, firmware revision %s",
 		 data->type, data->model, data->fw_rev);
@@ -314,6 +360,7 @@ static int exc3000_probe(struct i2c_client *client,
 	if (error)
 		return error;
 
+	dev_set_drvdata(&client->dev, data);
 	error = exc3000_populate_device_info(data);
 	if (error)
 		return error;
-- 
2.20.1