input: touchscreen: Add firmware upgrade via sysfs entry

Add sysfs entry for firmware upgrade support in Goodix
driver.

Change-Id: If71d4020223547e0db425c9fd37819c6166efcab
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>

drivers/input/touchscreen/gt9xx/gt9xx.c

@@ -1523,12 +1523,63 @@ static ssize_t gtp_fw_name_store(struct device *dev,
 	return size;
 }
 
+static ssize_t gtp_fw_upgrade_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct goodix_ts_data *ts = dev_get_drvdata(dev);
+
+	return snprintf(buf, 2, "%d\n", ts->fw_loading);
+}
+
+static ssize_t gtp_fw_upgrade_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct goodix_ts_data *ts = dev_get_drvdata(dev);
+	unsigned long val;
+	int ret;
+
+	if (size > 2)
+		return -EINVAL;
+
+	ret = kstrtoul(buf, 10, &val);
+	if (ret != 0)
+		return ret;
+
+	if (ts->gtp_is_suspend) {
+		dev_err(&ts->client->dev,
+			"Can't start fw upgrade. Device is in suspend state");
+		return -EBUSY;
+	}
+
+	mutex_lock(&ts->input_dev->mutex);
+	if (!ts->fw_loading && val) {
+		disable_irq(ts->client->irq);
+		ts->fw_loading = true;
+		if (config_enabled(CONFIG_GT9XX_TOUCHPANEL_UPDATE)) {
+			ret = gup_update_proc(NULL);
+			if (ret == FAIL)
+				dev_err(&ts->client->dev,
+						"Fail to update GTP firmware\n");
+		}
+		ts->fw_loading = false;
+		enable_irq(ts->client->irq);
+	}
+	mutex_unlock(&ts->input_dev->mutex);
+
+	return size;
+}
+
 static DEVICE_ATTR(fw_name, (S_IRUGO | S_IWUSR | S_IWGRP),
 			gtp_fw_name_show,
 			gtp_fw_name_store);
+static DEVICE_ATTR(fw_upgrade, (S_IRUGO | S_IWUSR | S_IWGRP),
+			gtp_fw_upgrade_show,
+			gtp_fw_upgrade_store);
 
 static struct attribute *gtp_attrs[] = {
 	&dev_attr_fw_name.attr,
+	&dev_attr_fw_upgrade.attr,
 	NULL
 };
 
@@ -1861,9 +1912,7 @@ static int goodix_ts_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-#if GTP_ESD_PROTECT
 	i2c_connect_client = client;
-#endif
 
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "GTP I2C not supported\n");
@@ -1915,18 +1964,17 @@ static int goodix_ts_probe(struct i2c_client *client,
 		strlcpy(ts->fw_name, pdata->fw_name,
 						strlen(pdata->fw_name) + 1);
 
-#ifdef CONFIG_GT9XX_TOUCHPANEL_UPDATE
+	if (config_enabled(CONFIG_GT9XX_TOUCHPANEL_UPDATE)) {
 		ret = gup_init_update_proc(ts);
 		if (ret < 0) {
 			dev_err(&client->dev,
-			"GTP Create firmware update thread error.\n");
+					"GTP Create firmware update thread error\n");
 			goto exit_power_off;
 		}
-#endif
+	}
-
 	ret = gtp_init_panel(ts);
 	if (ret < 0) {
-		dev_err(&client->dev, "GTP init panel failed.\n");
+		dev_err(&client->dev, "GTP init panel failed\n");
 		ts->abs_x_max = GTP_MAX_WIDTH;
 		ts->abs_y_max = GTP_MAX_HEIGHT;
 		ts->int_trigger_type = GTP_INT_TRIGGER;
@@ -1934,7 +1982,7 @@ static int goodix_ts_probe(struct i2c_client *client,
 
 	ret = gtp_request_input_dev(ts);
 	if (ret) {
-		dev_err(&client->dev, "GTP request input dev failed.\n");
+		dev_err(&client->dev, "GTP request input dev failed\n");
 		goto exit_free_inputdev;
 	}
 	input_set_drvdata(ts->input_dev, ts);
@@ -2117,6 +2165,14 @@ static int goodix_ts_suspend(struct device *dev)
 	}
 
 	mutex_lock(&ts->lock);
+
+	if (ts->fw_loading) {
+		dev_info(&ts->client->dev,
+			"Fw upgrade in progress, can't go to suspend.");
+		mutex_unlock(&ts->lock);
+		return 0;
+	}
+
 #if GTP_ESD_PROTECT
 	gtp_esd_switch(ts->client, SWITCH_OFF);
 #endif

drivers/input/touchscreen/gt9xx/gt9xx.h

@@ -89,6 +89,7 @@ struct goodix_ts_data {
 	u8  fw_error;
 	bool power_on;
 	struct mutex lock;
+	bool fw_loading;
 	struct regulator *avdd;
 	struct regulator *vdd;
 	struct regulator *vcc_i2c;
@@ -213,11 +214,9 @@ s32 init_wr_node(struct i2c_client *client);
 void uninit_wr_node(void);
 #endif
 
-#ifdef CONFIG_GT9XX_TOUCHPANEL_UPDATE
+u8 gup_init_update_proc(struct goodix_ts_data *ts);
-extern u8 gup_init_update_proc(struct goodix_ts_data *ts);
 s32 gup_enter_update_mode(struct i2c_client *client);
 void gup_leave_update_mode(struct i2c_client *client);
 s32 gup_update_proc(void *dir);
 extern struct i2c_client  *i2c_connect_client;
-#endif
 #endif /* _GOODIX_GT9XX_H_ */