1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2006-2010 Nokia Corporation
24 #include "tsc200x-core.h"
33  * 5) tsc200x_irq_thread() queues up a transfer to fetch the x, y, z1, z2
68 	u16 x;  member
85 	/* raw copy of previous x,y,z */
115 				     int x, int y, int pressure)  in tsc200x_update_pen_state()  argument
118 		touchscreen_report_pos(ts->idev, &ts->prop, x, y, false);  in tsc200x_update_pen_state()
119 		input_report_abs(ts->idev, ABS_PRESSURE, pressure);  in tsc200x_update_pen_state()
120 		if (!ts->pen_down) {  in tsc200x_update_pen_state()
121 			input_report_key(ts->idev, BTN_TOUCH, !!pressure);  in tsc200x_update_pen_state()
122 			ts->pen_down = true;  in tsc200x_update_pen_state()
125 		input_report_abs(ts->idev, ABS_PRESSURE, 0);  in tsc200x_update_pen_state()
126 		if (ts->pen_down) {  in tsc200x_update_pen_state()
127 			input_report_key(ts->idev, BTN_TOUCH, 0);  in tsc200x_update_pen_state()
128 			ts->pen_down = false;  in tsc200x_update_pen_state()
131 	input_sync(ts->idev);  in tsc200x_update_pen_state()
132 	dev_dbg(ts->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,  in tsc200x_update_pen_state()
144 	error = regmap_bulk_read(ts->regmap, TSC200X_REG_X, &tsdata,  in tsc200x_irq_thread()
150 	if (unlikely(tsdata.x > MAX_12BIT || tsdata.y > MAX_12BIT))  in tsc200x_irq_thread()
161 	* the value before pen-up - that implies SPI fed us stale data  in tsc200x_irq_thread()
163 	if (!ts->pen_down &&  in tsc200x_irq_thread()
164 	    ts->in_x == tsdata.x && ts->in_y == tsdata.y &&  in tsc200x_irq_thread()
165 	    ts->in_z1 == tsdata.z1 && ts->in_z2 == tsdata.z2) {  in tsc200x_irq_thread()
173 	ts->in_x = tsdata.x;  in tsc200x_irq_thread()
174 	ts->in_y = tsdata.y;  in tsc200x_irq_thread()
175 	ts->in_z1 = tsdata.z1;  in tsc200x_irq_thread()
176 	ts->in_z2 = tsdata.z2;  in tsc200x_irq_thread()
178 	/* Compute touch pressure resistance using equation #1 */  in tsc200x_irq_thread()
179 	pressure = tsdata.x * (tsdata.z2 - tsdata.z1) / tsdata.z1;  in tsc200x_irq_thread()
180 	pressure = pressure * ts->x_plate_ohm / 4096;  in tsc200x_irq_thread()
184 	scoped_guard(spinlock_irqsave, &ts->lock) {  in tsc200x_irq_thread()
185 		tsc200x_update_pen_state(ts, tsdata.x, tsdata.y, pressure);  in tsc200x_irq_thread()
186 		mod_timer(&ts->penup_timer,  in tsc200x_irq_thread()
190 	ts->last_valid_interrupt = jiffies;  in tsc200x_irq_thread()
199 	guard(spinlock_irqsave)(&ts->lock);  in tsc200x_penup_timer()
205 	regmap_write(ts->regmap, TSC200X_REG_CFR0, TSC200X_CFR0_INITVALUE);  in tsc200x_start_scan()
206 	regmap_write(ts->regmap, TSC200X_REG_CFR1, TSC200X_CFR1_INITVALUE);  in tsc200x_start_scan()
207 	regmap_write(ts->regmap, TSC200X_REG_CFR2, TSC200X_CFR2_INITVALUE);  in tsc200x_start_scan()
208 	ts->tsc200x_cmd(ts->dev, TSC200X_CMD_NORMAL);  in tsc200x_start_scan()
213 	ts->tsc200x_cmd(ts->dev, TSC200X_CMD_STOP);  in tsc200x_stop_scan()
218 	if (ts->reset_gpio) {  in tsc200x_reset()
219 		gpiod_set_value_cansleep(ts->reset_gpio, 1);  in tsc200x_reset()
221 		gpiod_set_value_cansleep(ts->reset_gpio, 0);  in tsc200x_reset()
225 /* must be called with ts->mutex held */
230 	guard(disable_irq)(&ts->irq);  in __tsc200x_disable()
232 	del_timer_sync(&ts->penup_timer);  in __tsc200x_disable()
233 	cancel_delayed_work_sync(&ts->esd_work);  in __tsc200x_disable()
236 /* must be called with ts->mutex held */
241 	if (ts->esd_timeout && ts->reset_gpio) {  in __tsc200x_enable()
242 		ts->last_valid_interrupt = jiffies;  in __tsc200x_enable()
243 		schedule_delayed_work(&ts->esd_work,  in __tsc200x_enable()
245 					msecs_to_jiffies(ts->esd_timeout)));  in __tsc200x_enable()
259 	error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high_orig);  in tsc200x_do_selftest()
261 		dev_warn(ts->dev, "selftest failed: read error %d\n", error);  in tsc200x_do_selftest()
265 	temp_high_test = (temp_high_orig - 1) & MAX_12BIT;  in tsc200x_do_selftest()
267 	error = regmap_write(ts->regmap, TSC200X_REG_TEMP_HIGH, temp_high_test);  in tsc200x_do_selftest()
269 		dev_warn(ts->dev, "selftest failed: write error %d\n", error);  in tsc200x_do_selftest()
273 	error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high);  in tsc200x_do_selftest()
275 		dev_warn(ts->dev,  in tsc200x_do_selftest()
284 		dev_warn(ts->dev, "selftest failed: %d != %d\n",  in tsc200x_do_selftest()
286 		return -EINVAL;  in tsc200x_do_selftest()
290 	error = regmap_read(ts->regmap, TSC200X_REG_TEMP_HIGH, &temp_high);  in tsc200x_do_selftest()
292 		dev_warn(ts->dev,  in tsc200x_do_selftest()
298 		dev_warn(ts->dev, "selftest failed after reset: %d != %d\n",  in tsc200x_do_selftest()
300 		return -EINVAL;  in tsc200x_do_selftest()
313 	scoped_guard(mutex, &ts->mutex) {  in tsc200x_selftest_show()
336 	umode_t mode = attr->mode;  in tsc200x_attr_is_visible()
339 		if (!ts->reset_gpio)  in tsc200x_attr_is_visible()
368 	scoped_guard(mutex_try, &ts->mutex) {  in tsc200x_esd_work()
369 		if (time_is_after_jiffies(ts->last_valid_interrupt +  in tsc200x_esd_work()
370 					  msecs_to_jiffies(ts->esd_timeout)))  in tsc200x_esd_work()
377 		error = regmap_read(ts->regmap, TSC200X_REG_CFR0, &r);  in tsc200x_esd_work()
386 		 * power-up and start scanning again.  in tsc200x_esd_work()
388 		dev_info(ts->dev, "TSC200X not responding - resetting\n");  in tsc200x_esd_work()
390 		scoped_guard(disable_irq, &ts->irq) {  in tsc200x_esd_work()
391 			del_timer_sync(&ts->penup_timer);  in tsc200x_esd_work()
399 	/* re-arm the watchdog */  in tsc200x_esd_work()
400 	schedule_delayed_work(&ts->esd_work,  in tsc200x_esd_work()
402 					msecs_to_jiffies(ts->esd_timeout)));  in tsc200x_esd_work()
409 	guard(mutex)(&ts->mutex);  in tsc200x_open()
411 	if (!ts->suspended)  in tsc200x_open()
414 	ts->opened = true;  in tsc200x_open()
423 	guard(mutex)(&ts->mutex);  in tsc200x_close()
425 	if (!ts->suspended)  in tsc200x_close()
428 	ts->opened = false;  in tsc200x_close()
443 		return -ENODEV;  in tsc200x_probe()
451 		return -ENODEV;  in tsc200x_probe()
456 		return -ENOMEM;  in tsc200x_probe()
460 		return -ENOMEM;  in tsc200x_probe()
462 	ts->irq = irq;  in tsc200x_probe()
463 	ts->dev = dev;  in tsc200x_probe()
464 	ts->idev = input_dev;  in tsc200x_probe()
465 	ts->regmap = regmap;  in tsc200x_probe()
466 	ts->tsc200x_cmd = tsc200x_cmd;  in tsc200x_probe()
468 	error = device_property_read_u32(dev, "ti,x-plate-ohms", &x_plate_ohm);  in tsc200x_probe()
469 	ts->x_plate_ohm = error ? TSC200X_DEF_RESISTOR : x_plate_ohm;  in tsc200x_probe()
471 	error = device_property_read_u32(dev, "ti,esd-recovery-timeout-ms",  in tsc200x_probe()
473 	ts->esd_timeout = error ? 0 : esd_timeout;  in tsc200x_probe()
475 	mutex_init(&ts->mutex);  in tsc200x_probe()
477 	spin_lock_init(&ts->lock);  in tsc200x_probe()
478 	timer_setup(&ts->penup_timer, tsc200x_penup_timer, 0);  in tsc200x_probe()
480 	INIT_DELAYED_WORK(&ts->esd_work, tsc200x_esd_work);  in tsc200x_probe()
482 	snprintf(ts->phys, sizeof(ts->phys),  in tsc200x_probe()
483 		 "%s/input-ts", dev_name(dev));  in tsc200x_probe()
485 	if (tsc_id->product == 2004) {  in tsc200x_probe()
486 		input_dev->name = "TSC200X touchscreen";  in tsc200x_probe()
488 		input_dev->name = devm_kasprintf(dev, GFP_KERNEL,  in tsc200x_probe()
490 						 tsc_id->product);  in tsc200x_probe()
491 		if (!input_dev->name)  in tsc200x_probe()
492 			return -ENOMEM;  in tsc200x_probe()
495 	input_dev->phys = ts->phys;  in tsc200x_probe()
496 	input_dev->id = *tsc_id;  in tsc200x_probe()
498 	input_dev->open = tsc200x_open;  in tsc200x_probe()
499 	input_dev->close = tsc200x_close;  in tsc200x_probe()
503 	__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);  in tsc200x_probe()
513 	touchscreen_parse_properties(input_dev, false, &ts->prop);  in tsc200x_probe()
515 	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);  in tsc200x_probe()
516 	error = PTR_ERR_OR_ZERO(ts->reset_gpio);  in tsc200x_probe()
542 	error = input_register_device(ts->idev);  in tsc200x_probe()
550 			   device_property_read_bool(dev, "wakeup-source"));  in tsc200x_probe()
560 	guard(mutex)(&ts->mutex);  in tsc200x_suspend()
562 	if (!ts->suspended && ts->opened)  in tsc200x_suspend()
565 	ts->suspended = true;  in tsc200x_suspend()
568 		ts->wake_irq_enabled = enable_irq_wake(ts->irq) == 0;  in tsc200x_suspend()
577 	guard(mutex)(&ts->mutex);  in tsc200x_resume()
579 	if (ts->wake_irq_enabled) {  in tsc200x_resume()
580 		disable_irq_wake(ts->irq);  in tsc200x_resume()
581 		ts->wake_irq_enabled = false;  in tsc200x_resume()
584 	if (ts->suspended && ts->opened)  in tsc200x_resume()
587 	ts->suspended = false;  in tsc200x_resume()