1 // SPDX-License-Identifier: GPL-2.0-only
9 #include <linux/crc-itu-t.h>
25  * u8		Report ID
26  * <contact data - variable length>
33  * u8		finger id
49 #define SIS_PKT_REPORT_OFFSET		2 /* Report ID/type */
71 #define SIS_CONTACT_ID_OFFSET		1 /* Contact ID */
76 #define SIS_CONTACT_PRESSURE_OFFSET(id)	(SIS_PKT_HAS_AREA(id) ? 8 : 6)  argument
95 	struct i2c_client *client;  member
104 static int sis_read_packet(struct i2c_client *client, u8 *buf,  in sis_read_packet()  argument
114 	ret = i2c_master_recv(client, buf, SIS_MAX_PACKET_SIZE);  in sis_read_packet()
116 		return -EIO;  in sis_read_packet()
120 		dev_err(&client->dev,  in sis_read_packet()
123 		return -E2BIG;  in sis_read_packet()
127 		return -EINVAL;  in sis_read_packet()
130 	count_idx  = len - 1;  in sis_read_packet()
140 			crc = crc_itu_t(0, buf + 2, len - 2 - 2);  in sis_read_packet()
141 			pkg_crc = get_unaligned_le16(&buf[len - 2]);  in sis_read_packet()
144 				dev_err(&client->dev,  in sis_read_packet()
147 				return -EINVAL;  in sis_read_packet()
150 			count_idx -= 2;  in sis_read_packet()
153 			dev_err(&client->dev,  in sis_read_packet()
154 				"%s: invalid packet ID %#02x\n",  in sis_read_packet()
156 			return -EINVAL;  in sis_read_packet()
160 			count_idx -= SIS_SCAN_TIME_LEN;  in sis_read_packet()
172 static int sis_ts_report_contact(struct sis_ts_data *ts, const u8 *data, u8 id)  in sis_ts_report_contact()  argument
174 	struct input_dev *input = ts->input;  in sis_ts_report_contact()
182 		dev_err(&ts->client->dev, "Unexpected touch status: %#02x\n",  in sis_ts_report_contact()
184 		return -EINVAL;  in sis_ts_report_contact()
189 		return -ENOENT;  in sis_ts_report_contact()
197 		if (id != SIS_ALL_IN_ONE_PACKAGE) {  in sis_ts_report_contact()
198 			if (SIS_PKT_HAS_AREA(id)) {  in sis_ts_report_contact()
203 			if (SIS_PKT_HAS_PRESSURE(id))  in sis_ts_report_contact()
205 					data[SIS_CONTACT_PRESSURE_OFFSET(id)];  in sis_ts_report_contact()
234 		error = sis_read_packet(ts->client, ts->packet,  in sis_ts_handle_packet()
242 			dev_err(&ts->client->dev,  in sis_ts_handle_packet()
248 		report_id = ts->packet[SIS_PKT_REPORT_OFFSET];  in sis_ts_handle_packet()
249 		contact = &ts->packet[SIS_PKT_CONTACT_OFFSET];  in sis_ts_handle_packet()
258 			num_to_report--;  in sis_ts_handle_packet()
272 	input_mt_sync_frame(ts->input);  in sis_ts_handle_packet()
273 	input_sync(ts->input);  in sis_ts_handle_packet()
282 	} while (ts->attn_gpio && gpiod_get_value_cansleep(ts->attn_gpio));  in sis_ts_irq_handler()
289 	if (ts->reset_gpio) {  in sis_ts_reset()
292 		gpiod_set_value(ts->reset_gpio, 1);  in sis_ts_reset()
294 		gpiod_set_value(ts->reset_gpio, 0);  in sis_ts_reset()
299 static int sis_ts_probe(struct i2c_client *client,  in sis_ts_probe()  argument
300 			const struct i2c_device_id *id)  in sis_ts_probe()  argument
306 	ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);  in sis_ts_probe()
308 		return -ENOMEM;  in sis_ts_probe()
310 	ts->client = client;  in sis_ts_probe()
312 	ts->attn_gpio = devm_gpiod_get_optional(&client->dev,  in sis_ts_probe()
314 	if (IS_ERR(ts->attn_gpio)) {  in sis_ts_probe()
315 		error = PTR_ERR(ts->attn_gpio);  in sis_ts_probe()
316 		if (error != -EPROBE_DEFER)  in sis_ts_probe()
317 			dev_err(&client->dev,  in sis_ts_probe()
322 	ts->reset_gpio = devm_gpiod_get_optional(&client->dev,  in sis_ts_probe()
324 	if (IS_ERR(ts->reset_gpio)) {  in sis_ts_probe()
325 		error = PTR_ERR(ts->reset_gpio);  in sis_ts_probe()
326 		if (error != -EPROBE_DEFER)  in sis_ts_probe()
327 			dev_err(&client->dev,  in sis_ts_probe()
334 	ts->input = input = devm_input_allocate_device(&client->dev);  in sis_ts_probe()
336 		dev_err(&client->dev, "Failed to allocate input device\n");  in sis_ts_probe()
337 		return -ENOMEM;  in sis_ts_probe()
340 	input->name = "SiS Touchscreen";  in sis_ts_probe()
341 	input->id.bustype = BUS_I2C;  in sis_ts_probe()
353 		dev_err(&client->dev,  in sis_ts_probe()
358 	error = devm_request_threaded_irq(&client->dev, client->irq,  in sis_ts_probe()
361 					  client->name, ts);  in sis_ts_probe()
363 		dev_err(&client->dev, "Failed to request IRQ: %d\n", error);  in sis_ts_probe()
367 	error = input_register_device(ts->input);  in sis_ts_probe()
369 		dev_err(&client->dev,  in sis_ts_probe()
379 	{ .compatible = "sis,9200-ts" },
387 	{ "9200-ts",	0 },