2 * Copyright (c) 2017 Samsung Electronics Co., Ltd.
3 * Author: Andi Shyti <andi.shyti@samsung.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * STMicroelectronics FTS Touchscreen device driver
12 #include <linux/delay.h>
13 #include <linux/i2c.h>
14 #include <linux/input/mt.h>
15 #include <linux/input/touchscreen.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/leds.h>
19 #include <linux/module.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/regulator/consumer.h>
24 #define STMFTS_READ_INFO 0x80
25 #define STMFTS_READ_STATUS 0x84
26 #define STMFTS_READ_ONE_EVENT 0x85
27 #define STMFTS_READ_ALL_EVENT 0x86
28 #define STMFTS_LATEST_EVENT 0x87
29 #define STMFTS_SLEEP_IN 0x90
30 #define STMFTS_SLEEP_OUT 0x91
31 #define STMFTS_MS_MT_SENSE_OFF 0x92
32 #define STMFTS_MS_MT_SENSE_ON 0x93
33 #define STMFTS_SS_HOVER_SENSE_OFF 0x94
34 #define STMFTS_SS_HOVER_SENSE_ON 0x95
35 #define STMFTS_MS_KEY_SENSE_OFF 0x9a
36 #define STMFTS_MS_KEY_SENSE_ON 0x9b
37 #define STMFTS_SYSTEM_RESET 0xa0
38 #define STMFTS_CLEAR_EVENT_STACK 0xa1
39 #define STMFTS_FULL_FORCE_CALIBRATION 0xa2
40 #define STMFTS_MS_CX_TUNING 0xa3
41 #define STMFTS_SS_CX_TUNING 0xa4
44 #define STMFTS_EV_NO_EVENT 0x00
45 #define STMFTS_EV_MULTI_TOUCH_DETECTED 0x02
46 #define STMFTS_EV_MULTI_TOUCH_ENTER 0x03
47 #define STMFTS_EV_MULTI_TOUCH_LEAVE 0x04
48 #define STMFTS_EV_MULTI_TOUCH_MOTION 0x05
49 #define STMFTS_EV_HOVER_ENTER 0x07
50 #define STMFTS_EV_HOVER_LEAVE 0x08
51 #define STMFTS_EV_HOVER_MOTION 0x09
52 #define STMFTS_EV_KEY_STATUS 0x0e
53 #define STMFTS_EV_ERROR 0x0f
54 #define STMFTS_EV_CONTROLLER_READY 0x10
55 #define STMFTS_EV_SLEEP_OUT_CONTROLLER_READY 0x11
56 #define STMFTS_EV_STATUS 0x16
57 #define STMFTS_EV_DEBUG 0xdb
59 /* multi touch related event masks */
60 #define STMFTS_MASK_EVENT_ID 0x0f
61 #define STMFTS_MASK_TOUCH_ID 0xf0
62 #define STMFTS_MASK_LEFT_EVENT 0x0f
63 #define STMFTS_MASK_X_MSB 0x0f
64 #define STMFTS_MASK_Y_LSB 0xf0
66 /* key related event masks */
67 #define STMFTS_MASK_KEY_NO_TOUCH 0x00
68 #define STMFTS_MASK_KEY_MENU 0x01
69 #define STMFTS_MASK_KEY_BACK 0x02
71 #define STMFTS_EVENT_SIZE 8
72 #define STMFTS_STACK_DEPTH 32
73 #define STMFTS_DATA_MAX_SIZE (STMFTS_EVENT_SIZE * STMFTS_STACK_DEPTH)
74 #define STMFTS_MAX_FINGERS 10
75 #define STMFTS_DEV_NAME "stmfts"
77 enum stmfts_regulators {
79 STMFTS_REGULATOR_AVDD,
83 struct i2c_client *client;
84 struct input_dev *input;
85 struct led_classdev led_cdev;
88 struct touchscreen_properties prop;
90 struct regulator_bulk_data regulators[2];
93 * Presence of ledvdd will be used also to check
94 * whether the LED is supported.
96 struct regulator *ledvdd;
104 u8 data[STMFTS_DATA_MAX_SIZE];
106 struct completion cmd_done;
114 static int stmfts_brightness_set(struct led_classdev *led_cdev,
115 enum led_brightness value)
117 struct stmfts_data *sdata = container_of(led_cdev,
118 struct stmfts_data, led_cdev);
121 if (value != sdata->led_status && sdata->ledvdd) {
123 regulator_disable(sdata->ledvdd);
125 err = regulator_enable(sdata->ledvdd);
127 dev_warn(&sdata->client->dev,
128 "failed to disable ledvdd regulator: %d\n",
133 sdata->led_status = value;
139 static enum led_brightness stmfts_brightness_get(struct led_classdev *led_cdev)
141 struct stmfts_data *sdata = container_of(led_cdev,
142 struct stmfts_data, led_cdev);
144 return !!regulator_is_enabled(sdata->ledvdd);
148 * We can't simply use i2c_smbus_read_i2c_block_data because we
149 * need to read more than 255 bytes (
151 static int stmfts_read_events(struct stmfts_data *sdata)
153 u8 cmd = STMFTS_READ_ALL_EVENT;
154 struct i2c_msg msgs[2] = {
156 .addr = sdata->client->addr,
161 .addr = sdata->client->addr,
163 .len = STMFTS_DATA_MAX_SIZE,
169 ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
173 return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
176 static void stmfts_report_contact_event(struct stmfts_data *sdata,
179 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
180 u16 x = event[1] | ((event[2] & STMFTS_MASK_X_MSB) << 8);
181 u16 y = (event[2] >> 4) | (event[3] << 4);
184 u8 orientation = event[6];
187 input_mt_slot(sdata->input, slot_id);
189 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
190 input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
191 input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
192 input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, maj);
193 input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, min);
194 input_report_abs(sdata->input, ABS_MT_PRESSURE, area);
195 input_report_abs(sdata->input, ABS_MT_ORIENTATION, orientation);
197 input_sync(sdata->input);
200 static void stmfts_report_contact_release(struct stmfts_data *sdata,
203 u8 slot_id = (event[0] & STMFTS_MASK_TOUCH_ID) >> 4;
205 input_mt_slot(sdata->input, slot_id);
206 input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
208 input_sync(sdata->input);
211 static void stmfts_report_hover_event(struct stmfts_data *sdata,
214 u16 x = (event[2] << 4) | (event[4] >> 4);
215 u16 y = (event[3] << 4) | (event[4] & STMFTS_MASK_Y_LSB);
218 input_report_abs(sdata->input, ABS_X, x);
219 input_report_abs(sdata->input, ABS_Y, y);
220 input_report_abs(sdata->input, ABS_DISTANCE, z);
222 input_sync(sdata->input);
225 static void stmfts_report_key_event(struct stmfts_data *sdata, const u8 event[])
229 input_report_key(sdata->input, KEY_BACK, 0);
230 input_report_key(sdata->input, KEY_MENU, 0);
233 case STMFTS_MASK_KEY_BACK:
234 input_report_key(sdata->input, KEY_BACK, 1);
237 case STMFTS_MASK_KEY_MENU:
238 input_report_key(sdata->input, KEY_MENU, 1);
242 dev_warn(&sdata->client->dev,
243 "unknown key event: %#02x\n", event[2]);
247 input_sync(sdata->input);
250 static void stmfts_parse_events(struct stmfts_data *sdata)
254 for (i = 0; i < STMFTS_STACK_DEPTH; i++) {
255 u8 *event = &sdata->data[i * STMFTS_EVENT_SIZE];
259 case STMFTS_EV_CONTROLLER_READY:
260 case STMFTS_EV_SLEEP_OUT_CONTROLLER_READY:
261 case STMFTS_EV_STATUS:
262 complete(&sdata->cmd_done);
265 case STMFTS_EV_NO_EVENT:
266 case STMFTS_EV_DEBUG:
270 switch (event[0] & STMFTS_MASK_EVENT_ID) {
272 case STMFTS_EV_MULTI_TOUCH_ENTER:
273 case STMFTS_EV_MULTI_TOUCH_MOTION:
274 stmfts_report_contact_event(sdata, event);
277 case STMFTS_EV_MULTI_TOUCH_LEAVE:
278 stmfts_report_contact_release(sdata, event);
281 case STMFTS_EV_HOVER_ENTER:
282 case STMFTS_EV_HOVER_LEAVE:
283 case STMFTS_EV_HOVER_MOTION:
284 stmfts_report_hover_event(sdata, event);
287 case STMFTS_EV_KEY_STATUS:
288 stmfts_report_key_event(sdata, event);
291 case STMFTS_EV_ERROR:
292 dev_warn(&sdata->client->dev,
293 "error code: 0x%x%x%x%x%x%x",
294 event[6], event[5], event[4],
295 event[3], event[2], event[1]);
299 dev_err(&sdata->client->dev,
300 "unknown event %#02x\n", event[0]);
305 static irqreturn_t stmfts_irq_handler(int irq, void *dev)
307 struct stmfts_data *sdata = dev;
310 mutex_lock(&sdata->mutex);
312 err = stmfts_read_events(sdata);
314 dev_err(&sdata->client->dev,
315 "failed to read events: %d\n", err);
317 stmfts_parse_events(sdata);
319 mutex_unlock(&sdata->mutex);
323 static int stmfts_command(struct stmfts_data *sdata, const u8 cmd)
327 reinit_completion(&sdata->cmd_done);
329 err = i2c_smbus_write_byte(sdata->client, cmd);
333 if (!wait_for_completion_timeout(&sdata->cmd_done,
334 msecs_to_jiffies(1000)))
340 static int stmfts_input_open(struct input_dev *dev)
342 struct stmfts_data *sdata = input_get_drvdata(dev);
345 err = pm_runtime_get_sync(&sdata->client->dev);
349 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_ON);
353 mutex_lock(&sdata->mutex);
354 sdata->running = true;
356 if (sdata->hover_enabled) {
357 err = i2c_smbus_write_byte(sdata->client,
358 STMFTS_SS_HOVER_SENSE_ON);
360 dev_warn(&sdata->client->dev,
361 "failed to enable hover\n");
363 mutex_unlock(&sdata->mutex);
365 if (sdata->use_key) {
366 err = i2c_smbus_write_byte(sdata->client,
367 STMFTS_MS_KEY_SENSE_ON);
369 /* I can still use only the touch screen */
370 dev_warn(&sdata->client->dev,
371 "failed to enable touchkey\n");
375 pm_runtime_put_noidle(&sdata->client->dev);
379 static void stmfts_input_close(struct input_dev *dev)
381 struct stmfts_data *sdata = input_get_drvdata(dev);
384 err = i2c_smbus_write_byte(sdata->client, STMFTS_MS_MT_SENSE_OFF);
386 dev_warn(&sdata->client->dev,
387 "failed to disable touchscreen: %d\n", err);
389 mutex_lock(&sdata->mutex);
391 sdata->running = false;
393 if (sdata->hover_enabled) {
394 err = i2c_smbus_write_byte(sdata->client,
395 STMFTS_SS_HOVER_SENSE_OFF);
397 dev_warn(&sdata->client->dev,
398 "failed to disable hover: %d\n", err);
400 mutex_unlock(&sdata->mutex);
402 if (sdata->use_key) {
403 err = i2c_smbus_write_byte(sdata->client,
404 STMFTS_MS_KEY_SENSE_OFF);
406 dev_warn(&sdata->client->dev,
407 "failed to disable touchkey: %d\n", err);
410 pm_runtime_put_sync(&sdata->client->dev);
413 static ssize_t stmfts_sysfs_chip_id(struct device *dev,
414 struct device_attribute *attr, char *buf)
416 struct stmfts_data *sdata = dev_get_drvdata(dev);
418 return sprintf(buf, "%#x\n", sdata->chip_id);
421 static ssize_t stmfts_sysfs_chip_version(struct device *dev,
422 struct device_attribute *attr, char *buf)
424 struct stmfts_data *sdata = dev_get_drvdata(dev);
426 return sprintf(buf, "%u\n", sdata->chip_ver);
429 static ssize_t stmfts_sysfs_fw_ver(struct device *dev,
430 struct device_attribute *attr, char *buf)
432 struct stmfts_data *sdata = dev_get_drvdata(dev);
434 return sprintf(buf, "%u\n", sdata->fw_ver);
437 static ssize_t stmfts_sysfs_config_id(struct device *dev,
438 struct device_attribute *attr, char *buf)
440 struct stmfts_data *sdata = dev_get_drvdata(dev);
442 return sprintf(buf, "%#x\n", sdata->config_id);
445 static ssize_t stmfts_sysfs_config_version(struct device *dev,
446 struct device_attribute *attr, char *buf)
448 struct stmfts_data *sdata = dev_get_drvdata(dev);
450 return sprintf(buf, "%u\n", sdata->config_ver);
453 static ssize_t stmfts_sysfs_read_status(struct device *dev,
454 struct device_attribute *attr, char *buf)
456 struct stmfts_data *sdata = dev_get_drvdata(dev);
460 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_STATUS,
461 sizeof(status), status);
465 return sprintf(buf, "%#02x\n", status[0]);
468 static ssize_t stmfts_sysfs_hover_enable_read(struct device *dev,
469 struct device_attribute *attr, char *buf)
471 struct stmfts_data *sdata = dev_get_drvdata(dev);
473 return sprintf(buf, "%u\n", sdata->hover_enabled);
476 static ssize_t stmfts_sysfs_hover_enable_write(struct device *dev,
477 struct device_attribute *attr,
478 const char *buf, size_t len)
480 struct stmfts_data *sdata = dev_get_drvdata(dev);
484 if (kstrtoul(buf, 0, &value))
487 mutex_lock(&sdata->mutex);
489 if (value && sdata->hover_enabled)
493 err = i2c_smbus_write_byte(sdata->client,
494 value ? STMFTS_SS_HOVER_SENSE_ON :
495 STMFTS_SS_HOVER_SENSE_OFF);
498 sdata->hover_enabled = !!value;
501 mutex_unlock(&sdata->mutex);
506 static DEVICE_ATTR(chip_id, 0444, stmfts_sysfs_chip_id, NULL);
507 static DEVICE_ATTR(chip_version, 0444, stmfts_sysfs_chip_version, NULL);
508 static DEVICE_ATTR(fw_ver, 0444, stmfts_sysfs_fw_ver, NULL);
509 static DEVICE_ATTR(config_id, 0444, stmfts_sysfs_config_id, NULL);
510 static DEVICE_ATTR(config_version, 0444, stmfts_sysfs_config_version, NULL);
511 static DEVICE_ATTR(status, 0444, stmfts_sysfs_read_status, NULL);
512 static DEVICE_ATTR(hover_enable, 0644, stmfts_sysfs_hover_enable_read,
513 stmfts_sysfs_hover_enable_write);
515 static struct attribute *stmfts_sysfs_attrs[] = {
516 &dev_attr_chip_id.attr,
517 &dev_attr_chip_version.attr,
518 &dev_attr_fw_ver.attr,
519 &dev_attr_config_id.attr,
520 &dev_attr_config_version.attr,
521 &dev_attr_status.attr,
522 &dev_attr_hover_enable.attr,
526 static struct attribute_group stmfts_attribute_group = {
527 .attrs = stmfts_sysfs_attrs
530 static int stmfts_power_on(struct stmfts_data *sdata)
535 err = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
541 * The datasheet does not specify the power on time, but considering
542 * that the reset time is < 10ms, I sleep 20ms to be sure
546 err = i2c_smbus_read_i2c_block_data(sdata->client, STMFTS_READ_INFO,
550 if (err != sizeof(reg))
553 sdata->chip_id = be16_to_cpup((__be16 *)®[6]);
554 sdata->chip_ver = reg[0];
555 sdata->fw_ver = be16_to_cpup((__be16 *)®[2]);
556 sdata->config_id = reg[4];
557 sdata->config_ver = reg[5];
559 enable_irq(sdata->client->irq);
563 err = stmfts_command(sdata, STMFTS_SYSTEM_RESET);
567 err = stmfts_command(sdata, STMFTS_SLEEP_OUT);
571 /* optional tuning */
572 err = stmfts_command(sdata, STMFTS_MS_CX_TUNING);
574 dev_warn(&sdata->client->dev,
575 "failed to perform mutual auto tune: %d\n", err);
577 /* optional tuning */
578 err = stmfts_command(sdata, STMFTS_SS_CX_TUNING);
580 dev_warn(&sdata->client->dev,
581 "failed to perform self auto tune: %d\n", err);
583 err = stmfts_command(sdata, STMFTS_FULL_FORCE_CALIBRATION);
588 * At this point no one is using the touchscreen
589 * and I don't really care about the return value
591 (void) i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
596 static void stmfts_power_off(void *data)
598 struct stmfts_data *sdata = data;
600 disable_irq(sdata->client->irq);
601 regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
605 /* This function is void because I don't want to prevent using the touch key
606 * only because the LEDs don't get registered
608 static int stmfts_enable_led(struct stmfts_data *sdata)
612 /* get the regulator for powering the leds on */
613 sdata->ledvdd = devm_regulator_get(&sdata->client->dev, "ledvdd");
614 if (IS_ERR(sdata->ledvdd))
615 return PTR_ERR(sdata->ledvdd);
617 sdata->led_cdev.name = STMFTS_DEV_NAME;
618 sdata->led_cdev.max_brightness = LED_ON;
619 sdata->led_cdev.brightness = LED_OFF;
620 sdata->led_cdev.brightness_set_blocking = stmfts_brightness_set;
621 sdata->led_cdev.brightness_get = stmfts_brightness_get;
623 err = devm_led_classdev_register(&sdata->client->dev, &sdata->led_cdev);
625 devm_regulator_put(sdata->ledvdd);
632 static int stmfts_probe(struct i2c_client *client,
633 const struct i2c_device_id *id)
636 struct stmfts_data *sdata;
638 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
639 I2C_FUNC_SMBUS_BYTE_DATA |
640 I2C_FUNC_SMBUS_I2C_BLOCK))
643 sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
647 i2c_set_clientdata(client, sdata);
649 sdata->client = client;
650 mutex_init(&sdata->mutex);
651 init_completion(&sdata->cmd_done);
653 sdata->regulators[STMFTS_REGULATOR_VDD].supply = "vdd";
654 sdata->regulators[STMFTS_REGULATOR_AVDD].supply = "avdd";
655 err = devm_regulator_bulk_get(&client->dev,
656 ARRAY_SIZE(sdata->regulators),
661 sdata->input = devm_input_allocate_device(&client->dev);
665 sdata->input->name = STMFTS_DEV_NAME;
666 sdata->input->id.bustype = BUS_I2C;
667 sdata->input->open = stmfts_input_open;
668 sdata->input->close = stmfts_input_close;
670 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_X);
671 input_set_capability(sdata->input, EV_ABS, ABS_MT_POSITION_Y);
672 touchscreen_parse_properties(sdata->input, true, &sdata->prop);
674 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
675 input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
676 input_set_abs_params(sdata->input, ABS_MT_ORIENTATION, 0, 255, 0, 0);
677 input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
678 input_set_abs_params(sdata->input, ABS_DISTANCE, 0, 255, 0, 0);
680 sdata->use_key = device_property_read_bool(&client->dev,
681 "touch-key-connected");
682 if (sdata->use_key) {
683 input_set_capability(sdata->input, EV_KEY, KEY_MENU);
684 input_set_capability(sdata->input, EV_KEY, KEY_BACK);
687 err = input_mt_init_slots(sdata->input,
688 STMFTS_MAX_FINGERS, INPUT_MT_DIRECT);
692 input_set_drvdata(sdata->input, sdata);
695 * stmfts_power_on expects interrupt to be disabled, but
696 * at this point the device is still off and I do not trust
697 * the status of the irq line that can generate some spurious
698 * interrupts. To be on the safe side it's better to not enable
699 * the interrupts during their request.
701 irq_set_status_flags(client->irq, IRQ_NOAUTOEN);
702 err = devm_request_threaded_irq(&client->dev, client->irq,
703 NULL, stmfts_irq_handler,
705 "stmfts_irq", sdata);
709 dev_dbg(&client->dev, "initializing ST-Microelectronics FTS...\n");
711 err = stmfts_power_on(sdata);
715 err = devm_add_action_or_reset(&client->dev, stmfts_power_off, sdata);
719 err = input_register_device(sdata->input);
723 if (sdata->use_key) {
724 err = stmfts_enable_led(sdata);
727 * Even if the LEDs have failed to be initialized and
728 * used in the driver, I can still use the device even
729 * without LEDs. The ledvdd regulator pointer will be
732 dev_warn(&client->dev, "unable to use touchkey leds\n");
733 sdata->ledvdd = NULL;
737 err = sysfs_create_group(&sdata->client->dev.kobj,
738 &stmfts_attribute_group);
742 pm_runtime_enable(&client->dev);
747 static int stmfts_remove(struct i2c_client *client)
749 pm_runtime_disable(&client->dev);
750 sysfs_remove_group(&client->dev.kobj, &stmfts_attribute_group);
755 static int __maybe_unused stmfts_runtime_suspend(struct device *dev)
757 struct stmfts_data *sdata = dev_get_drvdata(dev);
760 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_IN);
762 dev_warn(dev, "failed to suspend device: %d\n", ret);
767 static int __maybe_unused stmfts_runtime_resume(struct device *dev)
769 struct stmfts_data *sdata = dev_get_drvdata(dev);
772 ret = i2c_smbus_write_byte(sdata->client, STMFTS_SLEEP_OUT);
774 dev_err(dev, "failed to resume device: %d\n", ret);
779 static int __maybe_unused stmfts_suspend(struct device *dev)
781 struct stmfts_data *sdata = dev_get_drvdata(dev);
783 stmfts_power_off(sdata);
788 static int __maybe_unused stmfts_resume(struct device *dev)
790 struct stmfts_data *sdata = dev_get_drvdata(dev);
792 return stmfts_power_on(sdata);
795 static const struct dev_pm_ops stmfts_pm_ops = {
796 SET_SYSTEM_SLEEP_PM_OPS(stmfts_suspend, stmfts_resume)
797 SET_RUNTIME_PM_OPS(stmfts_runtime_suspend, stmfts_runtime_resume, NULL)
801 static const struct of_device_id stmfts_of_match[] = {
802 { .compatible = "st,stmfts", },
805 MODULE_DEVICE_TABLE(of, stmfts_of_match);
808 static const struct i2c_device_id stmfts_id[] = {
812 MODULE_DEVICE_TABLE(i2c, stmfts_id);
814 static struct i2c_driver stmfts_driver = {
816 .name = STMFTS_DEV_NAME,
817 .of_match_table = of_match_ptr(stmfts_of_match),
818 .pm = &stmfts_pm_ops,
820 .probe = stmfts_probe,
821 .remove = stmfts_remove,
822 .id_table = stmfts_id,
825 module_i2c_driver(stmfts_driver);
827 MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
828 MODULE_DESCRIPTION("STMicroelectronics FTS Touch Screen");
829 MODULE_LICENSE("GPL v2");